Some standard content:
ICS23.040
National Standard of the People's Republic of China
GB/T15345--2003
Replaces GB/T15345-1994
Test methods of concrete pipes for water transmission2003-07-23Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on 2004-03-01
GB/T15345~-2003
This standard refers to foreign standards TOCT 12586.0-83 & Technical conditions for vibration extrusion reinforced concrete + pressure pipes, JIS A5333-1993 Prestressed Concrete Pipe (Wire Wrapping Process), ANSI/AWWAC301-1999 Prestressed Steel Cylinder Concrete Pressure Pipe, ENBS642-1995 Prestressed Concrete Pressure Pipes with and without Steel Cylinders, Joints, Accessories and Special Requirements for Prestressed Steel Materials for Pipe Making, ASTMC497~1998 Test Methods for Concrete Pipes, Manholes or Tile Pipes. This standard replaces GB/T15345-1994 "Test Methods for Prestressed Concrete Water Pipes". The main changes of this standard compared with GB/I15345-1994 are as follows:
The applicable scope is expanded to GB4084-1999 "Self-stressed Concrete Water Pipes" and J625-1996 Prestressed Steel Cylinder Concrete Pipes;
- The measuring point position of the cement mortar protective layer thickness is modified (5.3.1.2 of the 1994 edition; this standard 8.2 of the 1994 edition); modified the test method for the strength of the cement mortar protective layer (5.4 of the 1994 edition; Chapter 11 of this edition); modified the environmental conditions for the water absorption test of the protective layer mortar, and clarified the components of the test instrument (5.5 of the 1994 edition, 12.2 and 12.3 of this edition)
- The specified value of the permeability test pressure, the specified value of the resistance test pressure and the evaluation of the test results (5.6.2.1, 5.6.2.2 of the 1994 edition, 5.6.3.3 of this edition) were deleted. 6.2.2 and 5.6.3)
-- The evaluation of the corner test results has been deleted (5.7,3 of the 1994 edition);-- The format and content of the writing of instruments and equipment have been changed (Chapter 4 of the 1994 edition; Chapter 4 and Appendix A of this edition);-- The normative appendix "Preparation and maintenance of protective layer mortar specimens" has been added (see Appendix K);-- The informative appendix "Test method for compressive strength of PCCP protective layer mortar (cutting method)" has been added (see Appendix C);-- The informative appendix "Test method for water absorption of PCCP protective layer mortar (pressure penetration method)" has been added (see Appendix D);-- The informative appendix "Test method for water absorption of PCCP protective layer mortar (boiling method)" has been added (see Appendix E). Appendix A and Appendix B of this standard are normative appendices. Appendix C, Appendix D and Appendix E are informative appendices. This standard is proposed by the China Building Materials Industry Association. This standard is organized by the National Technical Committee for Standardization of Cement Products. The responsible drafting unit of this standard: Suzhou Concrete Cement Products Research Institute. The drafting units of this standard are: Shandong Electric Pipeline Company, Wuxi Huayi Pipeline Co., Ltd., Shaanxi Hongqi Cement Products Factory, Kunming Yuda Pipe Co., Ltd., Nanning Hongji Cement Products Co., Ltd., Shenzhen Sun Rheinda Pipeline Co., Ltd., Tianjin Baodi District Cement Component Factory, Ningbo Jinke Cement Products Co., Ltd., Ningbo Jiandong Cement Products Co., Ltd., Ningxia Qinglong Pipeline Co., Ltd., Jiangsu Zhongyi Construction Engineering Co., Ltd., Chengdu Shuangliu Cement Products Factory, Chengdu Jinwei Pipe Co., Ltd., Anhui Cement Products Factory, Hangzhou Tenglong Pipe Industry Co., Ltd., Zaosuo Building Materials Products Factory, Zhejiang Baoye Residential Industry Co., Ltd., Zhejiang Jianfeng Pipe Industry Co., Ltd., Zibo Longquan Pipeline Engineering Co., Ltd., Xinjiang Tianshan Cement Products Co., Ltd., Xinyan Guotong Pipeline Co., Ltd., Tianjin Jingang Steel Wire Factory, Jiangsu Huaguang Shuangshun Machinery Manufacturing Co., Ltd., Guangdong Maoming Hengwei Rubber Products Co., Ltd. The main drafters of this standard are: Zhou Zheng, Xu Xiangyuan, Chen Gang, Wu Yueren, Li Junqi, Gan Jianxing, He Dong, Li Shixiang. This standard is entrusted to Suzhou Concrete Cement Products Research Institute for interpretation. The previous versions of the standards replaced by this standard are: GH/T15345-1994. Scope
Test methods for concrete water pipes
GB/T15345-2003
This standard specifies the test methods for the appearance quality, geometric dimensions, water pressure test, protective layer thickness, concrete strength, protective layer mortar strength and protective layer mortar water absorption, relative rotation angle and other items of concrete water pipes. The technical standard applies to four types of concrete water pipes, including self-stressed concrete water pipes (hereinafter indicated by Z or Z (), Z (non), Z (Ⅲ)); prestressed concrete water pipes produced by vibration extrusion process and pipe core winding process (hereinafter indicated by YYG and SYG respectively) and prestressed steel cylinder concrete pipes (hereinafter indicated by PCCP or PCCPL, PCCPE). 2 Normative reference documents
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties that have difficulty in reaching an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated referenced documents, the latest versions are applicable to this standard. GB/T1771985 Test method for strength of cement mortar GB1250 Method for expressing limit values and judgment method GB4084 Self-stressed concrete water pipe
5695--194 Prestressed concrete water pipe (dynamic extrusion process) GB5696—1994 Prestressed concrete water pipe (wire winding process) GB8170 Numerical rounding rules
GB/T11837—1989 Test method for compressive strength of concrete for concrete pipes GB50268—1997 Construction and acceptance code for water supply and drainage pipelines GB81-1985 Test method for the performance of ordinary concrete GIJ【0? Concrete strength test and evaluation standards JC/T218--1995 Self-stressed silicate cement JC625 Prestressed steel tube concrete pipe
JC715.--1996 White stress sulphoaluminate cement JC/T748 Rubber seal ring for prestressed and white stress reinforced concrete pipe (formerly 2BQ13001-1987) JGJ70~1990 Test method for basic properties of building mortar JG/T3020 Vibration table for concrete test
3 Terms and definitions
The following terms and definitions apply to this standard. 3.1 Honeycomb
The exposed gravel and cavities formed on the surface of pipe concrete due to the lack of cement mortar. 3.2 Sticking
The surface of the pipe wall is rough and non-slip due to the cement slurry sticking to the pipe membrane. 3.3 Scratches
The grooves with a depth greater than 1 mm left after the working surface of the plug is scratched by a sharp and hard substance. 3.4 Cracks
Irregular gaps on the surface of the pipe due to shrinkage. CB/T15345—2003
Narrow and long gaps on the surface of the pipe wall due to external forces that extend into the protective layer or the concrete of the pipe wall. 3.6 Exposed reinforcement
The stress-bearing steel bars of the pipe are not covered by the mortar and concrete. 3.7 Exposed longitudinal reinforcement
The exposed head of the longitudinal reinforcement or rust spots appear on the end face of the pipe. 3.8 Pits
Depressions formed on the inner wall of the pipe at a stage with a depth greater than one-half of the wall thickness and greater than 5 mm. 3.9 Four-convex seat
Uneven working surface of pipe socket, with local height difference and area greater than the specified value of corresponding product standard. 3.10 Hollow
Air interlayer formed by separation of interface between the whole protective layer of pipe and steel bar. 3.11 Falling off
Partial fall off of pipe protective layer, so that the stress-bearing steel bar here cannot be effectively protected. 3.12 Dislocation
Steps appear in the joint of socket work, stop glue platform and other parts of pipe mold, or the straight section of pipe body is higher than stop glue platform. 3.13 Bump
Damage of longitudinal length greater than 5mm caused by bumping support at the end of pipe. 3.14 Missing edge
Damage to the edge of pipe socket and catcher. 3.15 Roundness
The ratio of the difference between the maximum and minimum values of the inner diameter of socket and the outer diameter of plug to the specified value of corresponding standard is called socket ovality and socket roundness respectively.
3.16 Relative rotation angle
The angle between the longitudinal axes of two adjacent pipes specified in the product standard. 3.17 Inflection point
The junction between the outer slope of the socket-and-spigot pipe and the straight section of the pipe body. 3.18 Constant pressure
During the constant pressure process of the pipe water pressure test,The lower limit of water pressure should not be lower than the inspection pressure value specified in the standard (pressure supplementation is allowed during constant pressure).
4 Test instruments and measuring tools
See Appendix A for the main test instruments and measuring tools. 5 Appearance quality
5.1 Test pieces
For produced pipes, some tests can be carried out after demoulding during steam curing (or natural curing), and some tests can be carried out before storage. 5.2 Test method
5.2.1 Honeycomb, pitting, sticking and scoring a) Visually inspect the working surface of the socket and the pipe body for honeycomb, pitting, sticking and scoring; b) Use a steel ruler and steel tape measure to measure the length of the scoring, the size of the honeycomb, pitting and sticking and calculate their area; Use a steel ruler and depth vernier caliper or 20 iron wire to measure the maximum depth of the defect; c) Record the area and maximum depth of honeycomb, pitting and sticking, the depth and length of the scoring; 5.2.2 Cracks and cracks
Measure whether there are cracks and cracks on the surface of the pipe body. For suspicious areas, use the ketone mixed spot method to display; a) Use a 20x tool microscope to measure the maximum width of cracks and cracks; b) Use a steel ruler or steel monkey ruler to measure the maximum length; d) Record the maximum width and maximum length of cracks and cracks. 5.2.3 Floating scum, exposed stone, peeling and blistering
Self-check whether there is floating scum, exposed stone, peeling and blistering inside the pipe body; use a steel tape measure to measure the size of the above defects and calculate their area; b)
Use a depth vernier caliper to measure the maximum height of exposed stone; record the area of floating scum, exposed stone, peeling and blistering on the inner wall, and the maximum height of exposed stone. d)
5.2. 4 Exposed steel bars
Visually check whether there is exposed steel bars or rust on the surface of the pipe body; if the surface rust is removed and the load-bearing steel bars are exposed, it is exposed steel bars:; use a steel tape measure to measure the length of the exposed steel bars:
Record the number of exposed steel bars and the maximum length. 5.2. 5
Longitudinal reinforcement exposure
Visually inspect the longitudinal reinforcement heads at both ends of the pipe for rust spots or exposed reinforcement; a)
bh) If the surface rust spots are scraped off and the longitudinal reinforcement heads are exposed, it is longitudinal reinforcement exposure; record the number and location of the weave reinforcement exposure. c
Grooves, convexity and concave pits and holes
GB/T15345-2003
Measure whether there are grooves, convexity and holes on the socket and the working surface, whether there are grooves at the joint of the plug, and whether there are pits on the inner wall of the pipe: a)
Use a steel ruler and No. 20 iron wire to measure the depth and width of the groove, and calculate their product. Use a steel ruler and a ruler to measure the convexity and concave pits: b)
At the inner diameter measuring point of the pipe, place a 300mm steel ruler vertically on the inner wall of the pipe along the longitudinal direction of the pipe, and use a depth vernier caliper to measure the maximum depth of the pits and holes:
Record the depth of grooves, convexity and concave pits and holes. d>
5.2.7 Hollow
Use a 250mm claw hammer to hit the outer surface of the pipe and determine whether the pipe body has hollows based on the difference in sound. b)
Follow the boundary of different sounds when hitting the pipe to determine the range of hollows. Use a steel tape measure or steel ruler to measure the size and calculate the area between them; record the location, number and area of hollows. d)
Protective lip shedding
Measure whether the protective layer of the pipe body has fallen off;
Use a steel tape measure or steel ruler to measure the size of the shedding and calculate its area; b)
Record the location, depth and area of the shedding of the protective layer. Dislocation, flash, burr
Whether there is dislocation at the joint of the plug seal, the joint of the pipe body, and the joint of the pipe body and the stopper; use a 150 mm steel ruler to measure the height difference of the dislocation h)
Self-test whether there is flash and burr:
Record the height difference of the dislocation and the flash and burr. 5.2. 10
End bruises
Measure the ends of the pipe for bruises:
b) Use a steel tape measure or steel ruler to measure the circumferential length and longitudinal length of the bruises; record the circumferential length and longitudinal length of the bruises, GB/T 15345--2003
Sand exposed at the mouth
Visually check whether there is sand exposed at the socket;
Use a steel tape measure or steel ruler to measure the circumferential length and maximum width of the exposed sand; record the circumferential length and maximum width of the exposed sand. Leakage repair and repair quality
Visually inspect the pipe surface for leaks. If yes, use a steel ruler or steel tape measure to measure the size of the leak and calculate its area. h)
Observe the quality of the repair on the pipe surface, check whether there are cracks at the repaired part, whether it is smooth and flat, whether the bonding is firm, etc., and record them in detail. 5.2.13 Calculation of defect area
5.2.13.1 Estimation based on defect shape:
When the shape is approximately circular, measure the lengths of the vertical and horizontal directions perpendicular to each other at its approximate center position, as shown in Figure a)
la, and calculate its area according to formula (1) and formula (2): D _ Dh D.
Wherein:
D—average diameter of the defect, in millimeters (mm); S—defect area, in square millimeters (n1m); Dh—transverse diameter of the defect, in millimeters (rn); D, longitudinal diameter of the defect, in millimeters (mm) (1)
b) When the defect shape is approximately rectangular, measure the maximum length L, maximum width B and minimum width Bi, and take their average width, as shown in Figure 1b, and its area is calculated according to formula (3):
Wherein,
S=zBm+Bm
-defect area, in square millimeters (mm); s
defect length, in millimeters (mm);
defect maximum width, in millimeters (mm); B defect minimum width, in millimeters (mm). c) If the defect shape is difficult to determine, its area shall be the larger value calculated by formula (2) and formula (3). a) Measurement of the maximum diameter
b) Measurement of the width of the defect
Figure 1 Schematic diagram of defect size measurement
5.2.13.2 If the estimated area of the defect is at the edge of the judgment value, the white grid can be used for measurement. 6 Geometric dimensions
6.1 Test piece
Use the produced Z, YYG, SYG and PCCP or SYC, PCCP tube core. 6.2 Age
a) The tube should be taken out of the pond after the water storage is completed, and the surface should be air-dried before measurement. b) YYG, SYG and PCCP pipes should be measured after the pipe is demoulded or the subsequent process is completed. 6.3 Position of the diameter circumferential measuring point
GB/T15345--2003
a) For the butt produced by the integral mold, the intersection of two diameters with a central angle of about 90° and the pipe wall is determined at the socket end and the spigot end (see Figure 2a),
b) For the pipe produced by the two-piece mold or four-piece mold, the intersection of two diameters with a central angle of 15° with the pipe joint line and the wall is determined at the socket end and the spigot end (see Figure 2h). For SYG produced by a single-opening mold, the intersection of two diameters with a central angle of about 90° and the pipe wall is determined at the socket end and the spigot end (but the joint line should be staggered), see Figure 2b). (Close)
(Close)
2) Circumferential measurement position of the whole mold
6.4 Position of the axial measuring point of diameter
(Close)
(Close)
b) Circumferential measurement position of single-open mold, double-open mold and flap moldFigure 2 Schematic diagram of circumferential measurement position of diameter
The circumferential measuring points determined by the gate end and the socket end are extended along the axial direction of the pipe, and the longitudinal measuring points corresponding to the measured parts are the true diameter size. In Figures 3, 4 and 5, they are used ", \ indicates. a) Z axial measuring point position see Figure 3 (Cm measuring point distance to the end of the plug: 100mm when D, 300mm, 200mm when D>300mm).
b) YYG axial measuring point position see Figure 4a, SYG axial measuring point position of the rolling rubber seal ring for the joint see Figure 4b SYG axial measuring position of the sliding rubber seal ring for the joint see Figure 4c (C measuring point distance to the end of the socket: 200mm when D. forget 800mm, when D.>800 c) The position of the axial measuring point of PCCP is shown in Figure 5 (the distance between the measuring point C and the end of the pipe is 200 mm when D,≤800 mm and 500 mm when D,>800 mm).
GB/T15345—2003
(G-*)G
.Thickness of protective layer
C,——Inner diameter of pipe D. Point;
a) 7(1)
100 or 200
100 to 200
C ——Diameter of the rubber stopper at the outlet D, measuring point + Cs—Diameter of the sealing surface of the plug Ds point;
C,——Seat sealing surface diameter D,Measuring point. o
Figure 3 Axial measurement position of self-stress pipe diameter The unit is mm
The unit is mm
The unit price is meter
Pipe inner diameter measuring point+
200 or 600bzxZ.net
200 or 500
200 or 500
Socket 1. Working surface inner diameter) measuring point;
Stop glue table outer diameter D, measuring point:
Socket working surface diameter D, measuring point:
b) SYG (rolling seal doctor)
) SYG (comprehensive method
sliding sealing ring)
Figure 4 Axial measurement position of the diameter of the first-stage pipe and the third-stage pipe GB/T15345-2003
Unit is mm
Unit is mm
Unit is meter
GB/T15345-2003
Tube inner diameter L point;
C bearing inner diameter B point;
Socket outer diameter B, measuring point:
mouth depth;
-whitening length
200 or 500
a HCCPI
Embedded anchor
200 or 500
6) FCCPE (single rubber ring)
Embedded anchor
200 or 500
c) FCCPE (double rubber ring)
Figure 5 Axial measurement position of steel pipe diameter
Unit: mm
Unit: mm
6.5 Measurement method
6. 5.1 Pipe inner diameter D,, socket working surface inner diameter D, (Z), D, (YYG, SYG) 6. 5.1, 1 Measure at the measuring points determined in 6.3 and 6.4 with an inner diameter ruler (or special measuring tool). GB/T:15345—2003
6.5.1.2 Place the fixed probe of the inner diameter T scale close to a measuring point of the inner diameter of the pipe or the inner diameter of the working surface of the socket. The adjustable probe moves along the arc passing through the measuring point. The maximum value is the inner diameter of the pipe or the inner diameter of the working surface of the socket. Use the same method at the other pair of measuring points to measure another value.
6.5.1.3 Rounding of measured values:
a) For the inner diameter of the socket, take the average of the two values and round them to 1mm. b) The inner diameter of the socket working surface D, (7), D. (YYG, SYG), the two values are rounded to 1mm respectively. 6.5.2 The diameter of the socket working surface D, (Z), D (YYGSYG), the outer diameter of the socket stop glue base D2 (Z), Ds (YYG, SYG) 6.5.2.1 According to the points confirmed in .3 and 6.4, use a vernier caliper (or special measuring tool) to measure. 6.5.2.2 Place one measurement of the vernier caliper close to a measuring point, and the other measurement does not move along the arc passing through the relative measuring point. The maximum value is the diameter value of the socket working surface or the outer diameter value of the socket stop glue base. Use the alternating method at the other pair of measuring points to measure the other value. 6.5.2.3 Measurement value rounding
a) The two values of the diameter of the working surface of the socket D, (YYG, SYG) are rounded to 1tmm; the two values of D, (Z) are rounded to: when D is 100mm~~350mm, the positive deviation is rounded to mm1. The negative deviation is rounded to 0.5mm, when D is 400mm-800mm, the positive and negative deviations are rounded to 1nm
b) The two values of the outer diameter of the socket stopper D, (Z) and D, (YYG, SYG) are rounded to 1mm. 6.5.3 PCCP socket inner diameter B. Socket outer diameter B, 6.5.3. 1 According to the measuring point positions determined in 6.3 and 6.4, use a precision ruler and auxiliary magnet block that meet the requirements to measure Bs and B. 。 6.5.3.2 Measurement of B. and B.:
a) Use a magnet to attract the secondary end of the ruler around the steel ring, so that the ruler is close to the measuring surface and pushed forward a distance, and then fix it with a magnet. Repeat the previous actions, so that the ruler goes around the steel ring, and fix the end of the ruler with a magnet. The measured value is. b) Use a magnet to fix the secondary end of the ruler on the steel ring of the socket, make the lower ruler go around the edge of the steel ring concave once, and then fix the end of the ruler on the steel ring of the socket. Check whether the edge of the ruler is consistent with the edge of the groove. Remove the first and second magnets, tighten the ruler with both hands, pull it back and forth a few times, close to the measuring surface, and the measured value is B, 6.5.3.3 The inner diameter of the socket and the outer diameter of the socket are B. Rounded to one decimal place 6.5.4 PCCP socket roundness and socket ovality 6.5.4.1 According to the measuring point position determined in 6.4, use the inner diameter sub-ruler, vernier caliper or other special measuring tools to measure BB, the maximum and minimum values.
6.5.4.2 The ovality of the socket and spigot shall be calculated according to formula (4): B max.- B'min
The standard value of the ovality B (or B.) of the socket (or spigot) × 100
Wherein:
Bmx——the maximum value of B (or B) measured, in millimeters (mm); B'mir—the minimum value of B, or B,) measured, in millimeters (mm). The calculation result of the ovality of the socket or spigot shall be accurate to 0.001. 6.5.5 Length of spigot working surface I, (Z), length of socket working surface (YYG, SYG) ()
a) On the working surface of the spigot, make the steel ruler parallel to the axis of the pipe, measure the length values of the two spigot working surfaces, and read the values to 1mm. b) On the T-surface of YYG and SYG sockets, place a steel ruler parallel to the pipe axis, measure the length values of the two sockets, and read to 1 nm
6. 5. 6PCCP Socket depth C, spigot length Ea) Use two steel rulers with a range of 30 mm to measure the socket depth. Place one steel ruler close to the end face of the socket, and the end of the other steel ruler close to the vertical surface of the socket. The steel ruler is parallel to the axis of the pipe. Measure the C value and read to 1 mm. Measure any two values: lb) Use two steel rulers with a range of 300 mm to measure the spigot length E. Place one steel ruler close to the end face of the spigot, and the end of the other steel ruler close to the vertical surface of the spigot. The steel ruler is parallel to the axis of the pipe, measure the E value, and read to 1 mm. Measure any two values. 6.5.7 PCCP end face slope S
6.5.7.1 Clean the inner wall of the pipe near the socket end and the spigot end. The cleaning length is greater than the short side of the wide seat angle ruler. Determine two mutually perpendicular diameters at both ends.
6.5.7.2 Use a ruler to close to a point of the true diameter of the pipe end, the short side of the wide seat angle ruler to close to the cleaned inner wall of the pipe, and the ruler to close to the long side of the angle ruler. Use a steel ruler to measure the distance S from the ruler to another point of the pipe end diameter. See Figure 6. 6. 5.7.3 Measure two values at each end, read to mm, and take the larger value. Hs
podowea
. Wide seat angle ruler
3——Substitute.
7 Water pressure test
7.1 Test piece
Figure 6 Diagram of end face tilt measurement method
Z, YYG, PCCP are tested with manufactured pipes; SYG anti-permeability test can be carried out with wire-wrapped pipe cores, crack resistance test and joint sealing test are carried out with arms made of protective layer. 7.2 Age
a) B: Test is carried out after the pipe is expanded and stabilized. The pipe should be saturated with water and the outer surface should be dry. Determination of expansion stability period of pipes made of different cements: 1) Self-stressed silicate cement: According to the provisions of Article 3.5 of JC/T218---1995, the expansion stability period of self-stressed concrete is determined by measuring the free expansion rate of self-stressed concrete. White stress sulphuric acid cement: According to the provisions of Appendix B of 1996, the expansion stability period of self-stressed concrete is determined by measuring the white stress increase rate of 25% after 28 days. 3) Type A stress sulphuric acid cement: When the self-stress of the workshop water-cured specimen reaches more than 5% of the standard water-cured specimen, the concrete of this mix ratio is considered to have entered the self-stress stability period. When stored in the atmosphere for a long time, water pressure test shall be conducted after water return curing. The water return curing period: D≤30 is generally 3-5 days; D>300 is generally 5-9 days.
b) YYG: For the anti-seepage performance test, the hot steam curing and demoulding should not be less than 24 hours, and the concrete age of the crack resistance test should not be less than ?d.
c) SYG: The anti-seepage performance test can be conducted after the pipe core is wrapped with wire, and the concrete age of the pipe core for the crack resistance test should not be less than 7d.Working surface inner diameter) measuring point;
Glue stop outer diameter D, measuring point:
Socket working surface diameter D, measuring point:
b) SYG (rolling seal)
) SYG (comprehensive method
sliding seal ring)
Figure 4 Axial measurement position of the diameter of the first-stage pipe and the third-stage pipe GB/T15345—2003
Unit is mm
Unit is mm
Unit is meter
GB/T15345—2003
Tube inner diameter L point;
C Bearing inner diameter B point;
Socket outer diameter B, measuring point:
Mouth depth;
-whitening length
200 or 500
a HCCPI
Embedded anchor
200 or 500
6) FCCPE (single rubber ring)
Embedded anchor
200 or 500
c) FCCPE (double rubber ring)
Figure 5 Axial measurement position of steel pipe diameter
Unit: mm
Unit: mm
6.5 Measurement method
6. 5.1 Pipe inner diameter D,, socket working surface inner diameter D, (Z), D, (YYG, SYG) 6. 5.1, 1 Measure at the measuring points determined in 6.3 and 6.4 with an inner diameter ruler (or special measuring tool). GB/T:15345—2003
6.5.1.2 Place the fixed probe of the inner diameter T scale close to a measuring point of the inner diameter of the pipe or the inner diameter of the working surface of the socket. The adjustable probe moves along the arc passing through the measuring point. The maximum value is the inner diameter of the pipe or the inner diameter of the working surface of the socket. Use the same method at the other pair of measuring points to measure another value.
6.5.1.3 Rounding of measured values:
a) For the inner diameter of the socket, take the average of the two values and round them to 1mm. b) The inner diameter of the socket working surface D, (7), D. (YYG, SYG), the two values are rounded to 1mm respectively. 6.5.2 The diameter of the socket working surface D, (Z), D (YYGSYG), the outer diameter of the socket stop glue base D2 (Z), Ds (YYG, SYG) 6.5.2.1 According to the points confirmed in .3 and 6.4, use a vernier caliper (or special measuring tool) to measure. 6.5.2.2 Place one measurement of the vernier caliper close to a measuring point, and the other measurement does not move along the arc passing through the relative measuring point. The maximum value is the diameter value of the socket working surface or the outer diameter value of the socket stop glue base. Use the alternating method at the other pair of measuring points to measure the other value. 6.5.2.3 Measurement value rounding
a) The two values of the diameter of the working surface of the socket D, (YYG, SYG) are rounded to 1tmm; the two values of D, (Z) are rounded to: when D is 100mm~~350mm, the positive deviation is rounded to mm1. The negative deviation is rounded to 0.5mm, when D is 400mm-800mm, the positive and negative deviations are rounded to 1nm
b) The two values of the outer diameter of the socket stopper D, (Z) and D, (YYG, SYG) are rounded to 1mm. 6.5.3 PCCP socket inner diameter B. Socket outer diameter B, 6.5.3. 1 According to the measuring point positions determined in 6.3 and 6.4, use a precision ruler and auxiliary magnet block that meet the requirements to measure Bs and B. 。 6.5.3.2 Measurement of B. and B.:
a) Use a magnet to attract the secondary end of the ruler around the steel ring, so that the ruler is close to the measuring surface and pushed forward a distance, and then fix it with a magnet. Repeat the previous actions, so that the ruler goes around the steel ring, and fix the end of the ruler with a magnet. The measured value is. b) Use a magnet to fix the secondary end of the ruler on the steel ring of the socket, make the lower ruler go around the edge of the steel ring concave once, and then fix the end of the ruler on the steel ring of the socket. Check whether the edge of the ruler is consistent with the edge of the groove. Remove the first and second magnets, tighten the ruler with both hands, pull it back and forth a few times, close to the measuring surface, and the measured value is B, 6.5.3.3 The inner diameter of the socket and the outer diameter of the socket are B. Rounded to one decimal place 6.5.4 PCCP socket roundness and socket ovality 6.5.4.1 According to the measuring point position determined in 6.4, use the inner diameter sub-ruler, vernier caliper or other special measuring tools to measure BB, the maximum and minimum values.
6.5.4.2 The ovality of the socket and spigot shall be calculated according to formula (4): B max.- B'min
The standard value of the ovality B (or B.) of the socket (or spigot) × 100
Wherein:
Bmx——the maximum value of B (or B) measured, in millimeters (mm); B'mir—the minimum value of B, or B,) measured, in millimeters (mm). The calculation result of the ovality of the socket or spigot shall be accurate to 0.001. 6.5.5 Length of spigot working surface I, (Z), length of socket working surface (YYG, SYG) ()
a) On the working surface of the spigot, make the steel ruler parallel to the axis of the pipe, measure the length values of the two spigot working surfaces, and read the values to 1mm. b) On the T-surface of YYG and SYG sockets, place a steel ruler parallel to the pipe axis, measure the length values of the two sockets, and read to 1 nm
6. 5. 6PCCP Socket depth C, spigot length Ea) Use two steel rulers with a range of 30 mm to measure the socket depth. Place one steel ruler close to the end face of the socket, and the end of the other steel ruler close to the vertical surface of the socket. The steel ruler is parallel to the axis of the pipe. Measure the C value and read to 1 mm. Measure any two values: lb) Use two steel rulers with a range of 300 mm to measure the spigot length E. Place one steel ruler close to the end face of the spigot, and the end of the other steel ruler close to the vertical surface of the spigot. The steel ruler is parallel to the axis of the pipe, measure the E value, and read to 1 mm. Measure any two values. 6.5.7 PCCP end face slope S
6.5.7.1 Clean the inner wall of the pipe near the socket end and the spigot end. The cleaning length is greater than the short side of the wide seat angle ruler. Determine two mutually perpendicular diameters at both ends.
6.5.7.2 Use a ruler to close to a point of the true diameter of the pipe end, the short side of the wide seat angle ruler to close to the cleaned inner wall of the pipe, and the ruler to close to the long side of the angle ruler. Use a steel ruler to measure the distance S from the ruler to another point of the pipe end diameter. See Figure 6. 6. 5.7.3 Measure two values at each end, read to mm, and take the larger value. Hs
podowea
. Wide seat angle ruler
3——Substitute.
7 Water pressure test
7.1 Test piece
Figure 6 Diagram of end face tilt measurement method
Z, YYG, PCCP are tested with manufactured pipes; SYG anti-permeability test can be carried out with wire-wrapped pipe cores, crack resistance test and joint sealing test are carried out with arms made of protective layer. 7.2 Age
a) B: Test is carried out after the pipe is expanded and stabilized. The pipe should be saturated with water and the outer surface should be dry. Determination of expansion stability period of pipes made of different cements: 1) Self-stressed silicate cement: According to the provisions of Article 3.5 of JC/T218---1995, the expansion stability period of self-stressed concrete is determined by measuring the free expansion rate of self-stressed concrete. White stress sulphuric acid cement: According to the provisions of Appendix B of 1996, the expansion stability period of self-stressed concrete is determined by measuring the white stress increase rate of 25% after 28 days. 3) Type A stress sulphuric acid cement: When the self-stress of the workshop water-cured specimen reaches more than 5% of the standard water-cured specimen, the concrete of this mix ratio is considered to have entered the self-stress stability period. When stored in the atmosphere for a long time, water pressure test shall be conducted after water return curing. The water return curing period: D≤30 is generally 3-5 days; D>300 is generally 5-9 days.
b) YYG: For the anti-seepage performance test, the hot steam curing and demoulding should not be less than 24 hours, and the concrete age of the crack resistance test should not be less than ?d.
c) SYG: The anti-seepage performance test can be conducted after the pipe core is wrapped with wire, and the concrete age of the pipe core for the crack resistance test should not be less than 7d.Working surface inner diameter) measuring point;
Glue stop outer diameter D, measuring point:
Socket working surface diameter D, measuring point:
b) SYG (rolling seal)
) SYG (comprehensive method
sliding seal ring)
Figure 4 Axial measurement position of the diameter of the first-stage pipe and the third-stage pipe GB/T15345—2003
Unit is mm
Unit is mm
Unit is meter
GB/T15345—2003
Tube inner diameter L point;
C Bearing inner diameter B point;
Socket outer diameter B, measuring point:
Mouth depth;
-whitening length
200 or 500
a HCCPI
Embedded anchor
200 or 500
6) FCCPE (single rubber ring)
Embedded anchor
200 or 500
c) FCCPE (double rubber ring)
Figure 5 Axial measurement position of steel pipe diameter
Unit: mm
Unit: mm
6.5 Measurement method
6. 5.1 Pipe inner diameter D,, socket working surface inner diameter D, (Z), D, (YYG, SYG) 6. 5.1, 1 Measure at the measuring points determined in 6.3 and 6.4 with an inner diameter ruler (or special measuring tool). GB/T:15345—2003
6.5.1.2 Place the fixed probe of the inner diameter T scale close to a measuring point of the inner diameter of the pipe or the inner diameter of the working surface of the socket. The adjustable probe moves along the arc passing through the measuring point. The maximum value is the inner diameter of the pipe or the inner diameter of the working surface of the socket. Use the same method at the other pair of measuring points to measure another value.
6.5.1.3 Rounding of measured values:
a) For the inner diameter of the socket, take the average of the two values and round them to 1mm. b) The inner diameter of the socket working surface D, (7), D. (YYG, SYG), the two values are rounded to 1mm respectively. 6.5.2 The diameter of the socket working surface D, (Z), D (YYGSYG), the outer diameter of the socket stop glue base D2 (Z), Ds (YYG, SYG) 6.5.2.1 According to the points confirmed in .3 and 6.4, use a vernier caliper (or special measuring tool) to measure. 6.5.2.2 Place one measurement of the vernier caliper close to a measuring point, and the other measurement does not move along the arc passing through the relative measuring point. The maximum value is the diameter value of the socket working surface or the outer diameter value of the socket stop glue base. Use the alternating method at the other pair of measuring points to measure the other value. 6.5.2.3 Measurement value rounding
a) The two values of the diameter of the working surface of the socket D, (YYG, SYG) are rounded to 1tmm; the two values of D, (Z) are rounded to: when D is 100mm~~350mm, the positive deviation is rounded to mm1. The negative deviation is rounded to 0.5mm, when D is 400mm-800mm, the positive and negative deviations are rounded to 1nm
b) The two values of the outer diameter of the socket stopper D, (Z) and D, (YYG, SYG) are rounded to 1mm. 6.5.3 PCCP socket inner diameter B. Socket outer diameter B, 6.5.3. 1 According to the measuring point positions determined in 6.3 and 6.4, use a precision ruler and auxiliary magnet block that meet the requirements to measure Bs and B. 。 6.5.3.2 Measurement of B. and B.:
a) Use a magnet to attract the secondary end of the ruler around the steel ring, so that the ruler is close to the measuring surface and pushed forward a distance, and then fix it with a magnet. Repeat the previous actions, so that the ruler goes around the steel ring, and fix the end of the ruler with a magnet. The measured value is. b) Use a magnet to fix the secondary end of the ruler on the steel ring of the socket, make the lower ruler go around the edge of the steel ring concave once, and then fix the end of the ruler on the steel ring of the socket. Check whether the edge of the ruler is consistent with the edge of the groove. Remove the first and second magnets, tighten the ruler with both hands, pull it back and forth a few times, close to the measuring surface, and the measured value is B, 6.5.3.3 The inner diameter of the socket and the outer diameter of the socket are B. Rounded to one decimal place 6.5.4 PCCP socket roundness and socket ovality 6.5.4.1 According to the measuring point position determined in 6.4, use the inner diameter sub-ruler, vernier caliper or other special measuring tools to measure BB, the maximum and minimum values.
6.5.4.2 The ovality of the socket and spigot shall be calculated according to formula (4): B max.- B'min
The standard value of the ovality B (or B.) of the socket (or spigot) × 100
Wherein:
Bmx——the maximum value of B (or B) measured, in millimeters (mm); B'mir—the minimum value of B, or B,) measured, in millimeters (mm). The calculation result of the ovality of the socket or spigot shall be accurate to 0.001. 6.5.5 Length of spigot working surface I, (Z), length of socket working surface (YYG, SYG) ()
a) On the working surface of the spigot, make the steel ruler parallel to the axis of the pipe, measure the length values of the two spigot working surfaces, and read the values to 1mm. b) On the T-surface of YYG and SYG sockets, place a steel ruler parallel to the pipe axis, measure the length values of the two sockets, and read to 1 nm
6. 5. 6PCCP Socket depth C, spigot length Ea) Use two steel rulers with a range of 30 mm to measure the socket depth. Place one steel ruler close to the end face of the socket, and the end of the other steel ruler close to the vertical surface of the socket. The steel ruler is parallel to the axis of the pipe. Measure the C value and read to 1 mm. Measure any two values: lb) Use two steel rulers with a range of 300 mm to measure the spigot length E. Place one steel ruler close to the end face of the spigot, and the end of the other steel ruler close to the vertical surface of the spigot. The steel ruler is parallel to the axis of the pipe, measure the E value, and read to 1 mm. Measure any two values. 6.5.7 PCCP end face slope S
6.5.7.1 Clean the inner wall of the pipe near the socket end and the spigot end. The cleaning length is greater than the short side of the wide seat angle ruler. Determine two mutually perpendicular diameters at both ends.
6.5.7.2 Use a ruler to close to a point of the true diameter of the pipe end, the short side of the wide seat angle ruler to close to the cleaned inner wall of the pipe, and the ruler to close to the long side of the angle ruler. Use a steel ruler to measure the distance S from the ruler to another point of the pipe end diameter. See Figure 6. 6. 5.7.3 Measure two values at each end, read to mm, and take the larger value. Hs
podowea
. Wide seat angle ruler
3——Substitute.
7 Water pressure test
7.1 Test piece
Figure 6 Diagram of end face tilt measurement method
Z, YYG, PCCP are tested with manufactured pipes; SYG anti-permeability test can be carried out with wire-wrapped pipe cores, crack resistance test and joint sealing test are carried out with arms made of protective layer. 7.2 Age
a) B: Test is carried out after the pipe is expanded and stabilized. The pipe should be saturated with water and the outer surface should be dry. Determination of expansion stability period of pipes made of different cements: 1) Self-stressed silicate cement: According to the provisions of Article 3.5 of JC/T218---1995, the expansion stability period of self-stressed concrete is determined by measuring the free expansion rate of self-stressed concrete. White stress sulphuric acid cement: According to the provisions of Appendix B of 1996, the expansion stability period of self-stressed concrete is determined by measuring the white stress increase rate of 25% after 28 days. 3) Type A stress sulphuric acid cement: When the self-stress of the workshop water-cured specimen reaches more than 5% of the standard water-cured specimen, the concrete of this mix ratio is considered to have entered the self-stress stability period. When stored in the atmosphere for a long time, water pressure test shall be conducted after water return curing. The water return curing period: D≤30 is generally 3-5 days; D>300 is generally 5-9 days.
b) YYG: For the anti-seepage performance test, the hot steam curing and demoulding should not be less than 24 hours, and the concrete age of the crack resistance test should not be less than ?d.
c) SYG: The anti-seepage performance test can be conducted after the pipe core is wrapped with wire, and the concrete age of the pipe core for the crack resistance test should not be less than 7d.Measuring point:
mouth depth;
-whitening length
200 or 500
a HCCPI
Embedded anchor
200 late 500
6) FCCPE (single rubber ring)
Embedded anchor
200 or 500
c) FCCPE (double rubber ring)
Figure 5 Axial measurement position of steel pipe diameter
Unit is meter
Unit is meter
6.5 Measurement method
6. 5.1 Pipe inner diameter D,, socket working surface inner diameter D, (Z), D, (YYG, SYG)6, 5.1, 1 According to 6.3, 6.4 Determine the measuring point and measure it with an inner diameter ruler (or special measuring tool). GB/T:15345—2003
6.5.1.2 Place the fixed probe of the inner diameter ruler close to a measuring point of the inner diameter of the pipe or the inner diameter of the working surface of the socket. The adjustable probe moves along the arc passing through the measuring point of the cabinet. The maximum value is the inner diameter value of the pipe or the inner diameter of the working surface of the socket. Use the same method at the other pair of measuring points to measure another value.
6.5.1.3 Rounding of measured values:
a) The inner diameter of the buttocks. Take the average of the two values and round them to 1mm. b) The inner diameter of the socket working surface D, (7), D. (YYG, SYG), the two values are rounded to 1mm respectively. 6.5.2 The diameter of the socket working surface D, (Z), D (YYGSYG), the outer diameter of the socket stop glue base D2 (Z), Ds (YYG, SYG) 6.5.2.1 According to the points confirmed in .3 and 6.4, use a vernier caliper (or special measuring tool) to measure. 6.5.2.2 Place one measurement of the vernier caliper close to a measuring point, and the other measurement does not move along the arc passing through the relative measuring point. The maximum value is the diameter value of the socket working surface or the outer diameter value of the socket stop glue base. Use the alternating method at the other pair of measuring points to measure the other value. 6.5.2.3 Measurement value rounding
a) The two values of the diameter of the working surface of the socket D, (YYG, SYG) are rounded to 1tmm; the two values of D, (Z) are rounded to: when D is 100mm~~350mm, the positive deviation is rounded to mm1. The negative deviation is rounded to 0.5mm, when D is 400mm-800mm, the positive and negative deviations are rounded to 1nm
b) The two values of the outer diameter of the socket stopper D, (Z) and D, (YYG, SYG) are rounded to 1mm. 6.5.3 PCCP socket inner diameter B. Socket outer diameter B, 6.5.3. 1 According to the measuring point positions determined in 6.3 and 6.4, use a precision ruler and auxiliary magnet block that meet the requirements to measure Bs and B. 。 6.5.3.2 Measurement of B. and B.:
a) Use a magnet to attract the secondary end of the ruler around the steel ring, so that the ruler is close to the measuring surface and pushed forward a distance, and then fix it with a magnet. Repeat the previous actions, so that the ruler goes around the steel ring, and fix the end of the ruler with a magnet. The measured value is. b) Use a magnet to fix the secondary end of the ruler on the steel ring of the socket, make the lower ruler go around the edge of the steel ring concave once, and then fix the end of the ruler on the steel ring of the socket. Check whether the edge of the ruler is consistent with the edge of the groove. Remove the first and second magnets, tighten the ruler with both hands, pull it back and forth a few times, close to the measuring surface, and the measured value is B, 6.5.3.3 The inner diameter of the socket and the outer diameter of the socket are B. Rounded to one decimal place 6.5.4 PCCP socket roundness and socket ovality 6.5.4.1 According to the measuring point position determined in 6.4, use the inner diameter sub-ruler, vernier caliper or other special measuring tools to measure BB, the maximum and minimum values.
6.5.4.2 The ovality of the socket and spigot shall be calculated according to formula (4): B max.- B'min
The standard value of the ovality B (or B.) of the socket (or spigot) × 100
Wherein:
Bmx——the maximum value of B (or B) measured, in millimeters (mm); B'mir—the minimum value of B, or B,) measured, in millimeters (mm). The calculation result of the ovality of the socket or spigot shall be accurate to 0.001. 6.5.5 Length of spigot working surface I, (Z), length of socket working surface (YYG, SYG) ()
a) On the working surface of the spigot, make the steel ruler parallel to the axis of the pipe, measure the length values of the two spigot working surfaces, and read the values to 1mm. b) On the T-surface of YYG and SYG sockets, place a steel ruler parallel to the pipe axis, measure the length values of the two sockets, and read to 1 nm
6. 5. 6PCCP Socket depth C, spigot length Ea) Use two steel rulers with a range of 30 mm to measure the socket depth. Place one steel ruler close to the end face of the socket, and the end of the other steel ruler close to the vertical surface of the socket. The steel ruler is parallel to the axis of the pipe. Measure the C value and read to 1 mm. Measure any two values: lb) Use two steel rulers with a range of 300 mm to measure the spigot length E. Place one steel ruler close to the end face of the spigot, and the end of the other steel ruler close to the vertical surface of the spigot. The steel ruler is parallel to the axis of the pipe, measure the E value, and read to 1 mm. Measure any two values. 6.5.7 PCCP end face slope S
6.5.7.1 Clean the inner wall of the pipe near the socket end and the spigot end. The cleaning length is greater than the short side of the wide seat angle ruler. Determine two mutually perpendicular diameters at both ends.
6.5.7.2 Use a ruler to close to a point of the true diameter of the pipe end, the short side of the wide seat angle ruler to close to the cleaned inner wall of the pipe, and the ruler to close to the long side of the angle ruler. Use a steel ruler to measure the distance S from the ruler to another point of the pipe end diameter. See Figure 6. 6. 5.7.3 Measure two values at each end, read to mm, and take the larger value. Hs
podowea
. Wide seat angle ruler
3——Substitute.
7 Water pressure test
7.1 Test piece
Figure 6 Diagram of end face tilt measurement method
Z, YYG, PCCP are tested with manufactured pipes; SYG anti-permeability test can be carried out with wire-wrapped pipe cores, crack resistance test and joint sealing test are carried out with arms made of protective layer. 7.2 Age
a) B: Test is carried out after the pipe is expanded and stabilized. The pipe should be saturated with water and the outer surface should be dry. Determination of expansion stability period of pipes made of different cements: 1) Self-stressed silicate cement: According to the provisions of Article 3.5 of JC/T218---1995, the expansion stability period of self-stressed concrete is determined by measuring the free expansion rate of self-stressed concrete. White stress sulphuric acid cement: According to the provisions of Appendix B of 1996, the expansion stability period of self-stressed concrete is determined by measuring the white stress increase rate of 25% after 28 days. 3) Type A stress sulphuric acid cement: When the self-stress of the workshop water-cured specimen reaches more than 5% of the standard water-cured specimen, the concrete of this mix ratio is considered to have entered the self-stress stability period. When stored in the atmosphere for a long time, water pressure test shall be conducted after water return curing. The water return curing period: D≤30 is generally 3-5 days; D>300 is generally 5-9 days.
b) YYG: For the anti-seepage performance test, the hot steam curing and demoulding should not be less than 24 hours, and the concrete age of the crack resistance test should not be less than ?d.
c) SYG: The anti-seepage performance test can be conducted after the pipe core is wrapped with wire, and the concrete age of the pipe core for the crack resistance test should not be less than 7d.Measuring point:
mouth depth;
-whitening length
200 or 500
a HCCPI
Embedded anchor
200 late 500
6) FCCPE (single rubber ring)
Embedded anchor
200 or 500
c) FCCPE (double rubber ring)
Figure 5 Axial measurement position of steel pipe diameter
Unit is meter
Unit is meter
6.5 Measurement method
6. 5.1 Pipe inner diameter D,, socket working surface inner diameter D, (Z), D, (YYG, SYG)6, 5.1, 1 According to 6.3, 6.4 Determine the measuring point and measure it with an inner diameter ruler (or special measuring tool). GB/T:15345—2003
6.5.1.2 Place the fixed probe of the inner diameter ruler close to a measuring point of the inner diameter of the pipe or the inner diameter of the working surface of the socket. The adjustable probe moves along the arc passing through the measuring point of the cabinet. The maximum value is the inner diameter value of the pipe or the inner diameter of the working surface of the socket. Use the same method at the other pair of measuring points to measure another value.
6.5.1.3 Rounding of measured values:
a) The inner diameter of the buttocks. Take the average of the two values and round them to 1mm. b) The inner diameter of the socket working surface D, (7), D. (YYG, SYG), the two values are rounded to 1mm respectively. 6.5.2 The diameter of the socket working surface D, (Z), D (YYGSYG), the outer diameter of the socket stop glue base D2 (Z), Ds (YYG, SYG) 6.5.2.1 According to the points confirmed in .3 and 6.4, use a vernier caliper (or special measuring tool) to measure. 6.5.2.2 Place one measurement of the vernier caliper close to a measuring point, and the other measurement does not move along the arc passing through the relative measuring point. The maximum value is the diameter value of the socket working surface or the outer diameter value of the socket stop glue base. Use the alternating method at the other pair of measuring points to measure the other value. 6.5.2.3 Measurement value rounding
a) The two values of the diameter of the working surface of the socket D, (YYG, SYG) are rounded to 1tmm; the two values of D, (Z) are rounded to: when D is 100mm~~350mm, the positive deviation is rounded to mm1. The negative deviation is rounded to 0.5mm, when D is 400mm-800mm, the positive and negative deviations are rounded to 1nm
b) The two values of the outer diameter of the socket stopper D, (Z) and D, (YYG, SYG) are rounded to 1mm. 6.5.3 PCCP socket inner diameter B. Socket outer diameter B, 6.5.3. 1 According to the measuring point positions determined in 6.3 and 6.4, use a precision ruler and auxiliary magnet block that meet the requirements to measure Bs and B. 。 6.5.3.2 Measurement of B. and B.:
a) Use a magnet to attract the secondary end of the ruler around the steel ring, so that the ruler is close to the measuring surface and pushed forward a distance, and then fix it with a magnet. Repeat the previous actions, so that the ruler goes around the steel ring, and fix the end of the ruler with a magnet. The measured value is. b) Use a magnet to fix the secondary end of the ruler on the steel ring of the socket, make the lower ruler go around the edge of the steel ring concave once, and then fix the end of the ruler on the steel ring of the socket. Check whether the edge of the ruler is consistent with the edge of the groove. Remove the first and second magnets, tighten the ruler with both hands, pull it back and forth a few times, close to the measuring surface, and the measured value is B, 6.5.3.3 The inner diameter of the socket and the outer diameter of the socket are B. Rounded to one decimal place 6.5.4 PCCP socket roundness and socket ovality 6.5.4.1 According to the measuring point position determined in 6.4, use the inner diameter sub-ruler, vernier caliper or other special measuring tools to measure BB, the maximum and minimum values.
6.5.4.2 The ovality of the socket and spigot shall be calculated according to formula (4): B max.- B'min
The standard value of the ovality B (or B.) of the socket (or spigot) × 100
Wherein:
Bmx——the maximum value of B (or B) measured, in millimeters (mm); B'mir—the minimum value of B, or B,) measured, in millimeters (mm). The calculation result of the ovality of the socket or spigot shall be accurate to 0.001. 6.5.5 Length of spigot working surface I, (Z), length of socket working surface (YYG, SYG) ()
a) On the working surface of the spigot, make the steel ruler parallel to the axis of the pipe, measure the length values of the two spigot working surfaces, and read the values to 1mm. b) On the T-surface of YYG and SYG sockets, place a steel ruler parallel to the pipe axis, measure the length values of the two sockets, and read to 1 nm
6. 5. 6PCCP Socket depth C, spigot length Ea) Use two steel rulers with a range of 30 mm to measure the socket depth. Place one steel ruler close to the end face of the socket, and the end of the other steel ruler close to the vertical surface of the socket. The steel ruler is parallel to the axis of the pipe. Measure the C value and read to 1 mm. Measure any two values: lb) Use two steel rulers with a range of 300 mm to measure the spigot length E. Place one steel ruler close to the end face of the spigot, and the end of the other steel ruler close to the vertical surface of the spigot. The steel ruler is parallel to the axis of the pipe, measure the E value, and read to 1 mm. Measure any two values. 6.5.7 PCCP end face slope S
6.5.7.1 Clean the inner wall of the pipe near the socket end and the spigot end. The cleaning length is greater than the short side of the wide seat angle ruler. Determine two mutually perpendicular diameters at both ends.
6.5.7.2 Use a ruler to close to a point of the true diameter of the pipe end, the short side of the wide seat angle ruler to close to the cleaned inner wall of the pipe, and the ruler to close to the long side of the angle ruler. Use a steel ruler to measure the distance S from the ruler to another point of the pipe end diameter. See Figure 6. 6. 5.7.3 Measure two values at each end, read to mm, and take the larger value. Hs
podowea
. Wide seat angle ruler
3——Substitute.
7 Water pressure test
7.1 Test piece
Figure 6 Diagram of end face tilt measurement method
Z, YYG, PCCP are tested with manufactured pipes; SYG anti-permeability test can be carried out with wire-wrapped pipe cores, crack resistance test and joint sealing test are carried out with arms made of protective layer. 7.2 Age
a) B: Test is carried out after the pipe is expanded and stabilized. The pipe should be saturated with water and the outer surface should be dry. Determination of expansion stability period of pipes made of different cements: 1) Self-stressed silicate cement: According to the provisions of Article 3.5 of JC/T218---1995, the expansion stability period of self-stressed concrete is determined by measuring the free expansion rate of self-stressed concrete. White stress sulphuric acid cement: According to the provisions of Appendix B of 1996, the expansion stability period of self-stressed concrete is determined by measuring the white stress increase rate of 25% after 28 days. 3) Type A stress sulphuric acid cement: When the self-stress of the workshop water-cured specimen reaches more than 5% of the standard water-cured specimen, the concrete of this mix ratio is considered to have entered the self-stress stability period. When stored in the atmosphere for a long time, water pressure test shall be conducted after water return curing. The water return curing period: D≤30 is generally 3 to 5 days; D>300 is generally 5 to 9 days.
b) YYG: For the anti-seepage performance test, the hot steam curing and demoulding should not be less than 24 hours, and the concrete age for the anti-cracking performance test should not be less than ?d.
c) SYG: The anti-seepage performance test can be conducted after the pipe core is wrapped with wire, and the concrete age for the anti-cracking performance test should not be less than 7d.The maximum value is the diameter of the working surface of the socket or the outer diameter of the plug stop glue table. At another pair of measuring points, the alternate method is used to measure another value. 6.5.2.3 Measurement value rounding
a) The two values of the working surface diameter of the socket D, (YYG, SYG) are rounded to 1tmm; the two values of D, (Z) are rounded to: when D is 100mm~~350mm, the positive deviation is rounded to mm1. The negative deviation is rounded to 0.5mm, when D is 400mm-800mm, the positive and negative deviations are rounded to 1nm
b) The two values of the outer diameter of the plug stop glue table D, (Z) and D, (YYG, SYG) are rounded to 1mm. 6.5.3 PCCP socket inner diameter B. spigot outer diameter B, 6.5.3.1 According to the measuring point positions determined in 6.3 and 6.4, use a precision ruler and auxiliary magnet block that meet the requirements to measure Bs and B. 6.5.3.2 Measurement of B and B.:
a) Use a magnet to suck the auxiliary end of the ruler around the steel ring of the bearing, make the ruler close to the measuring surface and push it forward for a while, suck it with a magnet, repeat the previous action, make the ruler go around the steel ring, suck the end of the ruler with a magnet, and the measured value is. b) Use a magnet to fix the secondary end of the ruler on the steel ring of the socket, make the lower ruler go around the edge of the steel ring concave once, and then fix the end of the ruler on the steel ring of the socket. Check whether the edge of the ruler is consistent with the edge of the groove. Remove the first and second magnets, tighten the ruler with both hands, pull it back and forth a few times, close to the measuring surface, and the measured value is B, 6.5.3.3 The inner diameter of the socket and the outer diameter of the socket are B. Rounded to one decimal place 6.5.4 PCCP socket roundness and socket ovality 6.5.4.1 According to the measuring point position determined in 6.4, use the inner diameter sub-ruler, vernier caliper or other special measuring tools to measure BB, the maximum and minimum values.
6.5.4.2 The ovality of the socket and spigot shall be calculated according to formula (4): B max.- B'min
The standard value of the ovality B (or B.) of the socket (or spigot) × 100
Wherein:
Bmx——the maximum value of B (or B) measured, in millimeters (mm); B'mir—the minimum value of B, or B,) measured, in millimeters (mm). The calculation result of the ovality of the socket or spigot shall be accurate to 0.001. 6.5.5 Length of spigot working surface I, (Z), length of socket working surface (YYG, SYG) ()
a) On the working surface of the spigot, make the steel ruler parallel to the axis of the pipe, measure the length values of the two spigot working surfaces, and read the values to 1mm. b) On the T-surface of YYG and SYG sockets, place a steel ruler parallel to the pipe axis, measure the length values of the two sockets, and read to 1 nm
6. 5. 6PCCP Socket depth C, spigot length Ea) Use two steel rulers with a range of 30 mm to measure the socket depth. Place one steel ruler close to the end face of the socket, and the end of the other steel ruler close to the vertical surface of the socket. The steel ruler is parallel to the axis of the pipe. Measure the C value and read to 1
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