CJJ 2-1990 Municipal Bridge Engineering Quality Inspection and Assessment Standard
Some standard content:
Industry Standard of the People's Republic of China
Standard for Inspection and Assessment of Quality of Municipal Bridge Engineering CJ 2-90
Editor: Beijing Municipal Engineering Bureau
Approving Department: Ministry of Construction of the People's Republic of China Effective Date: August 1, 1991
4-6- 1
Notice on the Issuance of the Industry Standard "Standard for Inspection and Assessment of Quality of Municipal Bridge Engineering"
Construction Standard [1991] No. 4
To the Construction Committees (Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, the Construction Committees of cities with independent planning status, and relevant ministries and commissions of the State Council:
In accordance with the requirements of the former Ministry of Urban and Rural Construction and Environmental Protection Document No. (87) Cheng Keyu 276, the "Standard for Inspection and Assessment of Quality of Municipal Bridge Engineering" edited by the Beijing Municipal Engineering Bureau has been reviewed and approved as an industry standard, numbered CJ2-90, and will be implemented on August 1991. The former Ministry Standard "Interim Standard for Quality Inspection and Assessment of Municipal Engineering (Bridge Engineering)" CJ2-81 is abolished at the same time.
4-6-2
This standard is managed by the Beijing Municipal Design Institute, the technical unit responsible for urban road and bridge standards, and its specific interpretation is the responsibility of the Beijing Municipal Engineering Bureau.
This standard is organized and published by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
January 4, 1991
Chapter 1
Chapter 2
Chapter 3
Section 1
Section 2
Chapter 4
Section 1
Section 2
Section 3
Section 4
Chapter 5
Chapter 6
Chapter 7
Section 1
Section 2
Section 3
Section 4
Section 5
Chapter 8
Chapter 9
Inspection and Assessment Methods and Grades
Earth and Stonework
Foundation Pit Excavation·||tt| |Filling of foundation pit
Foundation engineering
Sunk piles,
Casking piles
Caulking well foundation·
Masonry,
Formwork·
Processing,
Welding·
Forming and installation,
Prestressed tendon production
Tensile drawing…
Cement concrete structures
(components)
Installation of cement concrete components
Beams, slabs
Arch ribs, arch trusses, arch waves
Second section
Second section Piers, columns
-6—4
6—-1
-6---8
--6--9
4-6—11
6—11
..... 4--6-11
Section 4: Railings, lamp posts, and sidewalk slabs. Section 5: Underground bridge jacking
. 4--6--12
Chapter 10
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7
Section 8
Steel Structure
Correction, Bending and Edge Processing
Bump Milling
Steel Structure Protection
Acceptance of Steel Structure Components
Installation of Steel Structure Components
Chapter 10
Section 1
Section 2
Section 3||tt ||Chapter 12
Section 1
Section 2
Section 3
Section 4
Appendix 2
Appendix 3,
Appendix 4
Bridge deck and sidewalk pavement
Deformation device
Bridge abutment or retaining wall drain hole
6—12
4--6-12
6—15
4--6—18
4--6—18
4--6—18
- 4--6—19
4--6—19
4--6—19
This standard adopts the term comparison table 4--6--19 Quality inspection and evaluation statistical calculation
Examples. · 1.
Evaluation of concrete strength acceptance
This standard commonly uses legal measurement units,
4--6--20
names, symbols and conversion factors. 4--6—21 Appendix 5
Explanation of terms used in this standard
Additional explanation
.. 4--6—21
4--6—21
46— 3
Chapter 1 General
Article 1.0.1 This standard is formulated to meet the needs of the development of municipal engineering construction, unify the quality inspection methods and evaluation standards for municipal bridge projects, improve the construction quality of municipal bridge projects, and promote the quality management of municipal bridge projects. Article 1.0.2 This standard is applicable to newly built, expanded, and rebuilt municipal bridge projects. Municipal bridge projects with special requirements shall be implemented in accordance with this standard except for the special requirements. Municipal bridge projects within industrial plant areas, and municipal bridge projects in remote suburbs and counties (districts) outside the urban area may be implemented in accordance with this standard. 1.0.3 The quality standards of raw materials, semi-finished products and finished products shall be implemented in accordance with the provisions of this standard if there are any. If there are no provisions, they shall be implemented in accordance with the current relevant standards. 1.0.4 Other relevant technical requirements in the quality inspection and evaluation of municipal bridge projects. They shall also meet the provisions of the current relevant standards. Inspection and evaluation methods and grade standards
Chapter II
Article 2.0.1
The quality evaluation of municipal bridge and canal projects is divided into two grades: "qualified" and "excellent".
2.0.2 The processes, parts and unit projects of the new municipal bridge project shall be divided according to the following requirements
, processes,
According to the process, they are divided into: earthwork, floor slab, reinforcement, prestressed barge, water filter concrete, pile foundation, caisson foundation, steel structure, component installation, masonry, decoration, other works, etc.
2. Location:
It is divided into four locations: foundation, lower structure, upper structure, bridge deck and auxiliary engineering.
Unit Project
The independent accounting items in the municipal bridge project should be a unit project. Article 2.0.3 The inspection and evaluation of the elements must be qualified after the appearance inspection before the inspection of the allowable deviation items can be carried out.
Article 2.0.4 When the sampling inspection is carried out, the sampling points should reflect the actual situation of the project. (For any inspection item of length, it should be sampled at the specified interval, and the name of the project is included.
Main project quantity
Inspection items
Allowed deviation
Serial number actual project
Submission team
Location name
Other items can be sampled arbitrarily within the specified range). Article 2.0.5 The inspection and evaluation of the quality of bridge engineering shall be carried out at three levels: process, location and unit engineering. The main basis for the evaluation standard is qualified: the qualified rate of the number of food buildings (rat) in the process, ... Second, for parts,
qualified, all processes are qualified, then the part should be rated as "qualified" and excellent. On the basis of being evaluated as qualified (when evaluating parts, the template process does not participate in the evaluation), the average qualified rate of all process inspection items should reach 85%, and the part should be rated as excellent.
Third, unit project:
qualified. All parts of the process are qualified, then the unit project should be rated as qualified. Excellent: On the basis of being evaluated as qualified, the average qualified rate of all parts (processes) inspection items reaches 85%, and the unit project should be rated as excellent. , should be promptly
Section 2.0.If the quality of the 8 processes does not meet the requirements of this standard, they will be processed. For reworked and scattered projects, their quality levels should be reassessed. After the reinforcement, the structural appearance is changed or permanent defects are caused (but the use effect is not affected). The project shall not be rated as excellent. Article 2.0.7 of the Municipal Bridge Dyeing Project Quality Inspection and Assessment must comply with the following provisions: 1. Process Handover Inspection. The inspection personnel (full-time or part-time) shall conduct the process handover inspection, assess the process level, and fill in Table 2.0.7-1 (the process handover inspection is carried out on the basis of the self-inspection and mutual inspection of the construction team). 2. Part Handover Inspection. The inspection personnel shall conduct part handover inspection on the basis of the process handover inspection, assess the part level, and fill in Table 2.0.7-2. 3. Unit Project Handover Inspection. The inspection personnel shall conduct unit project handover inspection on the basis of part or process handover inspection, assess the unit project quality level, and fill in Table 2.0.7-3. Process name, Table 2.0.7-1, Number of qualified points to be inspected] 89 1011 [12 1314| 15
Receiving team
Engineering and technical responsible person:
Quality inspector,
Construction worker:
Note: The actual number of inspection points shall not exceed the number of inspection points that should be inspected. If the number of inspection points exceeds the number of inspection points that should be inspected, the number of points that exceed the number of inspection points shall be subtracted from the number of qualified points. 4—6-4
Average qualified rate (%)
Evaluation level
Qualified rate
Project name:
Part quality assurance table
Part name
Process name
Average qualified rate (%)
Evaluation opinion
Engineering and technical responsible person,
Comprehensive, potential,*
Evaluation and other design
Qualified record||t t||Quality inspector,
Construction worker
Unit work quality evaluation table
Project name
Name of location (process)
Average qualified rate()
Reasonable intention
Project technical person in charge
Construction team:
Including (dream,*
Assessment equal quota
Inspector.
Quantity equal sugar
Investment unit!
Design unit:
Construction unit
Hao 2.0.7-2
Table 2.0.7-3
Earthworker.
Chapter 1 Earthwork and stonework
Section 1 Foundation pit opening
Collection 3.1.1 Article
The excavation of foundation pit shall not disturb the base soil.
If over-excavation occurs,
backfill with soil.
Article 3.1.2
Article 3.1.3
During construction, the slope should be stable to prevent the ground from being damaged. The base should not be soaked or frozen. The mud on the base must be cleaned up. Other debris and old materials that do not meet the design requirements must be handled. Article 3.1.4
The base soil treatment of pile foundation can refer to Article 3.1.3. The allowable deviation of foundation pit excavation shall comply with the provisions of Table 3.1.5. Article 3.1.5 The allowable deviation of foundation excavation The pit bottom height The axial displacement The allowable adjustment of foundation pit size shall not be less than the specified inspection rate Standard number of points Section 2 Table 3.1.5 Inspection method Use water meter to measure Use the meter to measure, count 1 point at each window Use a ruler, and the fill soil at each side shall not have slurry or "spring" phenomenon after rolling and compaction. Article 3.2.1 The fill soil shall not contain silt or humus, and the organic matter shall not exceed 5%.
Section 3.2.3 The compaction standard of plain fill shall comply with the requirements of Table 3.2.3. No.
Compactness
Compactness standard of fill
Test rate
(Light compaction method》
Test method
Inspection by ring force method for each group (three points) of each structure Chapter 4 Foundation Engineering
Section 1 Sinking piles
Article 4.1.1 After the pile is sunk, the pile body shall not be split. Article 4.1,2
The joint piles must be firm and straight.
The welding quality of the on-site joint welding of steel pipe piles shall be inspected by flaw detection Article 4.1.3
, and shall comply with the design requirements or the relevant provisions of Chapter 10, Section 3 of this standard. Article 4.1.4 When sinking sheet piles, the rods shall be connected neatly, without looseness, and the tiles shall be selected.
Article 4.1.5 The allowable deviation of the pile shall comply with the provisions of Table 4.1.5-1 and Table 4.1.5-2. The maximum deviation of the pile shall be within the range of ±108mm and shall not be less than the standard of the national standard. 4.1.5-1 Inspection method Measurement with ruler Observation elements Measurement with ruler 1. For the continuous column bearing the load, the control depth of the pile is mainly based on the height, with the penetration as a reference. The control depth of the pile end should be based on the height, with the height as the reference, and d as the diameter or short side size. (mm); α in the table is the angle between the design axis and the corresponding angle, unit: degree (\) ① L in the table is the length of the pile, (mm).
Sinking chain (copper tube) allowable adjustment
Zone stop mark increase
Material root axis square
Moving straight bridge weaving style and direction
Verification pull test degree
Resolution jaw material degree
Cut tolerance item height
Column item increase surface flatness
Remove head and follow
Change the top,
Lower pipe mouth
Meat porridge degree
Add ticket service height
Reinforcement excitement height
Allow deviation
Should meet the design requirements
±16xtan8| |tt||±50mm
The edge of the mouth should not be greater than
Note, ① d in the table is the true wall, (mm); L in the table is the length of the proof, (mm)
General test oxygen
Specification of national points
4.1.5-2
Test method
Record||Measure with wax instrument
Calculate with sugar measuring plate
Measure with level
Measure with level ruler
Measure with ruler
③ β in the table is the angle between the axis of the design fabric and the grid transmission line, (\). Section 2 Notes
Article 4.2.1 Underwater concrete has interlayer and loose layer. Article 4.2.2 The allowable deviation of the pile shall comply with the provisions of Table 4.2.2. 4—6--5 △ Compressive strength of filter soil A hole diameter Foundation foundation Cast-in-place piles allow for adjustment No parts Pad Inspection and inspection Specifications Attachment 3 No less than the design provisions of the dry +sg0mm Period demolition proposed line square meat Vertical bridge weaving axis direction Oblique vertebral material research Vertical chain straight skin Sinking thickness Rate coordination Wear bearing pile ±16ytang 0.64, and the size of the test method does not meet the requirements of Appendix 3. Use a borehole drill to test. Use a measuring rod to measure. Use a ruler to measure. Use a line to measure and calculate. Start to take notes on concrete. Use the angle between the oblique axis and the lead. Unit: (\). ② In the table, L is the length of the particle, (mm), and d is the diameter of the particle, (mm). Section 3: Sinking Foundation Article 4.3.1 After the caisson sinks, there shall be no leakage on the inner wall. Article 4.3.2 The surface of the bottom seal concrete shall be flat, and no leakage is allowed on the entire bottom seal.
Article 4.3.3 The allowable deviation of the sinking shall comply with the provisions of Table 4.3.3. Allowable deviation of the sinking neck
Test rate
△ Compressive strength of soil
Vertical axis of the sample
Allowable deviation
The minimum requirement
1%H (H<1000mm
Allow 100mm)
1.5%H (When H<1000
■Vertical sample practice space m is 10mm) Sinking height
Vertical degree
±100mm
Note. H in the sample is the sinking depth, (m). Sequence
A mortar temperature
Sectional dimensions
Preliminary elevation
Axial displacement
Additional surface straightness
Flatness
Also flatness
Wall blockiness
Micro points
Test method
Measured in accordance with the provisions of the attached
Confirmed by measuring with a culture instrument
Measured with a level
Physical energy sugar aggregation
Purple patch stone
Magnetic platform, retaining wall disturbance
Calculation 4. 4.1 Article
Article 4.4.2
Silt, debris.
Article 4.4.3
Section 4 The pad must be laid evenly and leveled. Before pouring concrete, the base surface must be kept clean and the allowable deviation of the pad shall comply with the provisions of Table 4.4.3. Instruments Allowable Inspection
Surface Departure
Axial Displacement
Plane Dimensions
No Adjustment
Chapter 5
Inspection RatewwW.bzxz.Net
Number of Points
Table 4.4.3
Inspection Method
Measure with a level
Measure with a ruler, and measure with a ruler on each side
Article 5.0.1 The body mortar must be filled and saturated. The mortar joints shall be neat and evenly hooked, and the joints shall meet the requirements. The hooks shall not be hollow or fall off. Article 5.0.2
Oxygen 5.0.3 The new body shall be staggered in layers, and the joints shall be tight.
Article 5.0.4 Silver
Embedded parts, water-through bolts, filter layers, waterproof facilities, etc. shall meet the requirements of the design or specifications.
Complex 5.0.5 The masonry blocks shall not be loose, overlapped or floating. Article 5.0.6 The storage of the body shall meet the requirements of Table 5.0.6. Note: ① The strength of the mortar must meet the following requirements: 1) A group of test blocks (6 blocks) shall be made in each structure or 50 1 body. If the mortar mix ratio is changed, test blocks shall also be made. 12) The average strength of each group of test blocks of the mortar shall not be lower than the design requirements. 13) The minimum strength of the test blocks in the decay phase shall not be lower than 5% of the design requirements. ① In the table, H is the height of the structure (m).
4--6—6
Parts show dust hand class
Inspection method
Should comply with the provisions of Note D
Measure with a ruler, set 1 point for length, width and distance
Measure with a water pump
[Measure with a warp and cotton meter, set 1 point for weaving and transverse respectively. Inspect with a touch line
Use a 2 m ruler to take a small slow measurement and take the maximum value
Press a 10 m small key to measure the maximum release
Slope board inspection
Chapter 6 Formwork
Article 6.0.1 The board and support shall not be loose, run out of the mold or sink. Article 6.0,2 The board must be tightly spliced and must not leak slurry; the mold must be clean. Article 6.0.3 For any component formwork that needs to be arched, the reserved arch degree shall comply with the provisions of Article 6.0.4 The allowable deviation of the integral formwork shall comply with the provisions of Table 6.0.4. The integral formwork is allowed to have a whole body. The surface height difference between the two plates is not piercing. The surface flatness of the non-light-resistant formwork is not piercing. The verticality of the wall and column is not piercing. The internal dimension of the formwork is not piercing. The axis position of the beam is not piercing. The verticality of the beam is not piercing. The verticality of the beam is not piercing. Implementation of each section of the bottom height difference
support plate, heating plate, instrument
fin plate, etc.
inspection, vertebral barrier, etc.
plane height cover
allowable deviation
inspection frequency
real award hand 6
standard risk points
6.0.4
inspection method
measure with ruler
[external avoidance length
prestressed tendon hole position
note, the table is the structure height, (n)
Article 6.0.5
each section
static tear
use 2 m ruler inspection
use a slow or pure instrument
measure with ruler, length and width.
Each of the three points is calculated
Measure with a compass
Measure with a level
Measure with a level
Measure with a ruler
Measure with a level
Measure with a ruler
Measure with a level
The allowable deviation of the prefabricated component formwork shall comply with the provisions of Table 6.0.5. The allowable deviation of the prefabricated component formwork shall comply with the provisions of Table 6.0.5. |tt||Sword light model
The two adjacent boards are both high and low
Surface flatness
Uncertain fluorine board
Creative light template
Not exceeding the light lock city
Just horizontal board
column, pile
, press and help, frame
board, pick and place
column, chain
beam, arch rib, seed frame||tt ||Plate, arch wave
Frame, arch rib, extension
Plate, arch wave
Allow confirmation
Inspection frequency
Range of points
Inspection method
Use only expensive
Inspect with 2m ruler
Use ruler
Allow deviation
Inspection frequency
Range of points
Plate, 1. The prestressed hole of the prestressed hole is more than 72000, and the diameter is greater than 10. Note: ① L in the figure is the length of the component, (mm) per visual channel. ① The allowable deviation of the pre-treatment component position shall comply with the provisions of Table 6.0.4. The allowable deviation of the test board can be referred to in this article. 2. Inspection and adjustment method: The full length of the component is set. The maximum height is measured by the tester sample. The allowable deviation of the small component template shall comply with the provisions of Table 6.0.6.6. Small-sized mechanical components are allowed to have full body and cross-sectional dimensions. The cross-sectional dimensions are allowed to be adjusted. Inspection details are as follows: (10% of all small-sized components shall be inspected, and not less than the sample size.) Chapter VII, Section 1 Inspection Methods: The technical conditions for the steel bars, including the steel bars, steel bars, steel surfaces, and steel bars, shall comply with the design requirements and the relevant provisions of Article 7.1.1. The surface shall be clean and free from cast skin, oil stains, paint and other dirt. Articles 7.1, 2 The steel bar must be straight, and the surface scratches and rust after straightening should not reduce the steel bar stability area.
Article 7.1.3
fracture and other phenomena.
Calculation 7.1.4 Slurry
Cold drawing rate
After the steel bar is bent and formed, there shall be no cracks, scales or steel bar processing allowable deviations. The steel processing allowable deviation adjustment
Allow letter adjustment
Not large-scale design
Design regulations
Forced steel effective deformation length
Think of point adjustment
3 Li Qi sailing boat
Monument height
Suitable size
Article 7.2.1 Article
Inspection rate
"Number of points
Each piece (one type is missing
10% is randomly inspected, and not less than
5 pieces)
Section 2
Table 7.1.4
Inspection method
"Measure with a ruler
Before welding, the rust, water scale and oil stains on the welding parts of the steel bars and steel wires must be removed; the twists and bends on the steel bars should be straightened or removed.
There shall be no transverse cracks at the flash butt weld of the steel bars, and the electrodes shall be welded to the steel bars. The surface of the steel bars at the joints shall not have obvious burns for Grade I, II and II steel bars; and shall not have burns for Grade 46-7 IV steel bars. In low temperature butt welding, there shall be no burns for Grade II, II and IY steel bars. The mechanical properties and allowable deviations of flash butt welded joints shall comply with the provisions of Table 7.2.2. Mechanical properties and allowable cycle of flash butt welded joints Items
Tensile strength
Joint fracture
Allowable deviation
Inspection rate
Each piece (each batch
Conform to the material consumption
Energy standard
3 10% and no less than 10% of the joint axis of the steel bar. 1d and no more than 0.0 pieces) Inspection method Use a ruler and a feeler gauge to measure the sugar production potential. Note ① In the same shift, a worker with the same type will replace the 200 joints of the same type as a batch. When welding is continued within a week, it can be calculated cumulatively. When the cumulative number of joints is less than 200 in a week, it is also calculated as a batch, and IV general steel daily cleaning does not consider the toxicity index. Section 7.2.3 Every. The welding surface of the arc joint of the reinforcing bar should be flat, without large depressions and nodules, and there should be no cracks at the joint. When the joint is knocked with a small hammer, it should make a crisp sound similar to that of the original steel bar. Its mechanical properties, defects and dimensional tolerances should comply with the requirements of Table 7.2.3.
The performance, defects and dimensions of the machine head are required to be carefully checked, especially the shrinkage pad
Inspection rate
Resistance to tensile arc failure
New continuous head
Sugar axis
Sensitive joints (
Actual axis 0.1d and no daily
Batch sampling 10%, and
Rate of some grass
Enemycetes length
Horizontal bite work cohesion
Ye sugar thin surface
In and length
On the gas machine product| |tt||The maximum size of the continuous failure
is not less than 10)
not more than 2
not less than 3.0
to: D capsule diameter d, (mm),
Element 7.2.3
Test method
According to the current American Association
Road to hot
Use a ruler to measure
The R and
separation case and use a ruler to measure
@Take 300 two-type sugar heads (network adjustment, same vertical connection) as one number. Continuous sample injection within one week can be counted. If less than 100 connections are made within one week, it can also be counted. 7.2.4 The refractory metal at the welding points of the resistance spot welding frame and the welded mesh should be evenly connected, and there should be no thinning, cracks, porous defects and obvious burning phenomena at the welding points. The depth of pressure should meet the requirements. The allowable deviation of the appearance dimensions of the steel bar spot welding products should comply with the provisions of Table 7.2.4-1. In addition to the appearance inspection, the load-bearing welded frame and the welded mesh should also be tested for strength, and the shear resistance index of the point should comply with the provisions of Table 7.2.4-2.
Fiber optic point analysis mouse crystal appearance size allowable cycle items
Coal joint mesh
Welded skeleton
Double sugar size
Bone fiber optic clinical shadow
Difference in the diagonal of the piece
Allowed equal damage
Inspection rate
Table 7.2.4-1
Inspection method missing
Each piece of wood or bone
Present (each type of double fine
Check 1 0%, and not less!
6 pieces]
Measure with ruler
Sheath grade
"No. period
Shear force index of resin weld point (kN)
Diameter of small mold (mm)
Low phosphorus spot wire
Table 7.2.4-2
In the past, all welds with the same type, diameter and size were the same type of islands. Every 200 types were a batch, and 3 pieces were randomly selected from the batch. When the welding is included in one category. It can be calculated cumulatively. If the number of joints is less than 200, it is also calculated in batches. Section 7.2.5 The weld package of the T-joint of the embedded parts should be uniform, and there should be no welding penetration or dents on the steel plate. The allowable deviation of defects and dimensions should comply with the provisions of Table 7.2.6. The allowable deviation of defects and dimensions should comply with the provisions of Table 7.2.6. The allowable deviation of tensile strength should not exceed kN/m for each change of the head and the maximum deviation of each batch of shaft changes should not exceed 50 mm. The height of the weld should not exceed the depth of the weld. ||T-shaped shaft touch
sugar cold test
number and size
not more than 0.6mm
not more than "
not more than 8
not more than 1.6m
inspection method
should be in accordance with "Box Maximum Tensile Test Method B228
each joint
use welding tool ruler and
(each batch of random inspection
10%, and not less than 6)
measure
with ruler, ① For the external inspection, the same type of finished products are considered as a batch, and for the strength inspection, the same number or products are considered as a batch. If the number of finished products is less than 100 pieces within a week, they are also considered as a batch. Section 3 Plastic and Installation Article 7.3.1 Before forming, the steel grade, number of roots, shape, diameter, etc. must be prepared according to the design requirements. Article 7.3.2 When binding and forming, the fast wire must be solid and must not slide, break, or shift. Article 7.3.3 After forming, the mesh frame must be stable and firm, and must not be loose or deformed during installation and concrete pouring. Article 7.3.4 In the same surface of the force-bearing reinforcement, only one head can be replaced on the same root.
Property; A micro surface refers to the area within 30d (4 is the straight light) and shall not be less than 504mm (the same below).
Article 7.3.5 The distance between the binding or buried joint and the bending point of the steel bar shall not be less than 10 times the main bar diameter, and it should not be located at the maximum risk. Article 7.3.B The allowable deviation of the fat mesh and the frame forming shall comply with Table 7.3.6.
Ketoacid tablets and bone inhibition growth allowance difference
Two network sizes
The base of the two diagonal practices of the mesh
Allows for integration
Inspection rate
[
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