Some standard content:
73. 100.10
Registration No.: 5508—2005
People's Republic of China Coal Industry Standard
MT/T942--2005
2005-02-14 Issued
Prestressed anchorage in coal minc2005-06-01 Implementation
National Development and Reform Commission
Normative References
3 Terms and Definitions
4 Classification and Management Numbers
5 Technical Requirements
Trial and Adjustment Method
7 Inspection Rules
8 Packaging Marking, Induction and Storage
Record 4 (Normative Appendix) Design Bearing Capacity Calculation of Current Used Anchorage
Appendix 3 (Informative Appendix) Safety System and Maximum Force Meter of Mining Anchorage MT/T 942—2005
MT/T942—2005
This standard has 5 chapters that are mandatory, and the rest are recommended. Appendix A of this standard is a normative appendix, and the appendix is informative. This standard is proposed by the Technical Development Department of China Coal Industry Association, and this standard is issued by the State Coal Industry Standardization Technical Committee: This standard drafting unit: Beijing China Coal Mine Engineering Company, Beijing Coal Industry Rod Product Supervision and Inspection Center. The main drafters of this standard are Han Honggao, Ji Wenyan, Fang Zhongzi, Ding Qilu 1.
MT/T 942—2005
This standard specifies the classification, technical requirements, test results, inspection rules, and marking, packaging, pollution and storage of prestressed anchors for coal mine shaft and tunnel engineering support. This standard is for prestressed anchors for coal mine shaft and tunnel engineering support. 2 Normative references
The following documents are used with the numbers of this standard and become the terms of this standard. For documents with a valid date, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, all parties who have reached an agreement based on this standard are encouraged to use the latest versions of these documents. From the outdated version, the latest version is applicable to this standard. CB/T230.124 Hardness test Part 1: Test method (A, B, C, D, E, FG HKNT standard R50-11M0)
core B/T231.1--2002 Metal cloth area hardness test Part 1: Test force method (eg15) 6506-1:195) GB/T28293002 Cycle grid counting shaft sample procedure and table (suitable for the inspection of process stability) GB/1222-3003 Prestressed concrete [monthly steel wire GB/T1011] - January 2000 Method for random sampling of prestressed anchors H/12370—2000 Prestressed anchors with their clamps and connectors M1146.1-2552 grease anchors MT4G.2—2322 MT/T89-2000 Technical specification for prestressed anchorage in coal mines 3 Terms and definitions The following technical definitions apply to this standard Prestressed anchorage incual Nine A device used for coal mine shaft reinforcement, consisting of steel, pins and other components 3.2 Prestressed prestress The initial stress applied in advance to the anchor.
Strand
Strandl
Number of prestressed steel strands with a sheath of steel wires. 3.4
Anchorage
Permanent fixing device used to maintain the tension of the prestressed steel strand and reverse it to a short extension. 3.5
Strand-aneharc usstmbleA force unit composed of a single or multiple prestressed steel strands and a pin installed at the end. 3.6
Design bearing capacity
The axial tension that the cable is allowed to withstand during its service life. 942—2005
Anchor capacityUltimate forceAnchorage capacityUltimate force that the anchor can withstand.
Anchorcaoacity
The anchor is made of steel.
4 Classification and model
4.1 Classification
The structure of the mining cable can be divided into F type and L type. 4.2 Model
The model of mining cable is as follows:
Tensile strength of steel wire, unit is Pa (V)Number of steel wire
Diameter of steel wire ring, unit is meter (m)Construction rate (common type, 1-cage type) Mining
Characteristic: 1-phase direct welding 35.21 anti-seizure limit is 1900MF. The room-mounted paving materials and accessories that meet the requirements of the normal test and corresponding pressure-resistant paving materials can be marked as SK1-1/86D.
5 Technical requirements
5.1 Mining paving materials
5. 1. 1 Basic requirements
5.1.1.1 The anchor cable should have the required fixing performance, sufficient bearing strength and good applicability to ensure full play of the advantages of the anchor cable and safe use.
5.1, 1.2 The components of the mining anchor cable should meet the requirements of this standard and be manufactured according to the approved drawings and technical specifications. 5.1.1.3 The super-grease fixing agent used in the mining anchor cable should meet the requirements of MT146.12(2): When the anchor cable is used with the same agent, it should meet the requirements of MT/T87-2000.
5.1.1.4 If the end cable has anti-corrosion requirements and the use environment is recorded, take appropriate anti-corrosion measures. 5. 1.2 Static load performance
The static load performance of the cable: The static load performance of the cable is determined by the actual ultimate tensile force determined by the load test of the strand-anchor assembly and the total strain of the variable length of the assembly. The strain efficiency coefficient is determined by the formula: 1 : F.
or:
The measured over-limit tensile force of the strand-anchor assembly is in N (F), which is calculated based on the actual tensile strength of the stranded wire according to the maximum force level of the stranded wire specimen and the minimum force level (N). The strain efficiency coefficient of the strand-anchor assembly measured in the static test is 1
The unloading performance of the cable meets the following requirements: 20.95;
MT/T 94220C5
When the copper wire and its assembly reach the measured limit, it should be caused by a shallow fracture of the valve. It should not be caused by the damage of the tool. After the test, the anchor part will have or have residual deformation, but there should be no visible bagging ring. 5. t.3 Anti-pullout performance
The pullout resistance of the cable during the test and adjustment should not be less than 1.5 times the design bearing capacity N., that is, T1. The calculation of the anchor rate bearing capacity N. should be in accordance with the provisions of Appendix A. 5.2 Steel strands for mining anchor cables
5.2.1 Basic requirements
The steel strands for mining anchor cables should comply with the provisions of B4-201 and have a product certification provided by the manufacturer. If steel strands produced according to international standards are used, they should comply with the provisions of the corresponding international standards. 5.2.2 Length of steel strands
The cutting speed should be optical or liquid. The steel strand length should meet the design requirements. The length error is +s nm
5.3 Anchor tools for mining
5.3.1 Basic requirements
5.3.1.1 The anchor bolts for mining shall comply with the provisions of GB/T437-2(3). There shall be an inspection and calibration center established by the tool manufacturer or an estimator. 5.3.1.2 The anchor plates for mining cables shall match the specifications and strength levels of the selected steel. 5.3.2 Surface hardness of anchor tools
The surface hardness of anchor tools shall be given. 5.4 Standard plate
5.4.7 Pallet form
It is advisable to select a bottle-shaped pallet with a size not less than 15cmm×15cmm square) or 50rum special shape: If a half-plate pallet is selected, the original size shall not be less than 15nmr. The center hole of the pallet is 2~4mm larger than the nominal point of the steel.5.4.2 The bearing capacity of the pallet should be less than the design bearing capacity N, as specified in Section 1.5. 1.6 Test method 6.1 General provisions 6.1.1 The test grade wire jig assembly shaft parts should be made of the same steel and all the jig parts before assembly. The quality of the jig parts that affect the performance of the storage cable is not equal to that of the jig. E.1.2 The steel used in the test jig assembly and the jig should be of the same type and specification as the steel actually selected for the storage cable. 6.1.3 The bearing capacity of a single steel rod: The length of the jig assembly, excluding the supporting parts, should not be less than 89mT5.1.The 4 tests shall be recorded in detail and the total strain when the efficiency coefficient 7 and the steel wire-pin assembly card reaches the measured limit tension shall be calculated according to the above. 6.2 Mining anchor case wire maximum force test
Temporary and high force tests shall be carried out in accordance with the provisions of 8, 1 of GE/T5221-200.7. 6.3 Mining rope static load test
6.3.1 Test equipment, loading ash and supporting oil, load sensor, test bench, caliper, return ruler. 6.3.2 Assembly form
The assembly form of the steel wire rope-pipe fixture test shall be as shown in Figure 1.3
MT/T 942—2005
1.13-Edition control construction:
2,13.—Clip,
3,11——Care for the ring;
Seat:
Law control seat:
7 About the quality,
! —. Transmission when
E.3.3 Test method
National 1 brand test group bag form
6.3.3.1 The largest piece of the drawing tool should be the tightest. Before loading, the initial fire should be very shallow. The initial fire should be taken from the initial strength scale. The length of the blue is about 10%. The formal loading and installation should be: according to the relatively complete strength scale. The effect of the loading is that 10%, 60%, and 50% of the main loading are appropriate. The loading intensity is locMla/m. After 8e is added, the load is maintained at 11 to ensure that the full load is fully broken. E.3.3.2 When conducting a test on a single steel strand assembly, the stress reaches 5.R. The load time can be shortened, but not more than lcmin
6.3.4 Observation and recording items
E.3.4.1W2. The trial process observation and recording items include the following rates; Figure 2 Calculation of shrinkage range
\) The pot is relatively cut-: The inner box of the belt assembly must: The relative positions of the various parts of the anchor soldier!
) The measured limit report of the steel strand-anchor assembly when the measured limit tension is reached.) Description and record of the damaged part of the assembly: MT/T 942-2005
\) After the shear force reaches 2% of the shear limit tensile strength R., observe the shape of the anchor within 1h or 10min of the single steel strand. 3.4.2 The static load test shall be carried out for two groups in a row, and the test results of the three groups shall meet the requirements of this standard. 6. 3.5 Calculation of test results
The anchor efficiency coefficient is calculated by formula (). The total strain is calculated by formula (2):
In the formula:
tm - Lt-n x 10%
The total strain when the steel warp can be assembled to reach the actual absorption limit is: t,
Such as the load can be swept on the piston, the unit is meter () 7.-Add the initial stroke of the piston in the lower hall, the unit is meter (when the assembly is damaged, the piston has a smooth stroke, the unit is meter (): Ad
The internal volume of the light wire is installed, the unit is meter (m).6.4 Appearance size Inspection
Use naked eye observation and steel tape measure, vernier caliper to inspect the appearance quality and shape, and pay attention to whether the product appearance has double bonds. 6.5 Shrinkage mold surface roughness inspection
Drop mold surface bottom range, use Rockwell hardness tester or Brinell hardness tester, according to the provisions of 3/T230.1-2001 GF/T1.1-2 soft to carry out surface speed inspection.
6.6 Determination of shear strength
6. 6.1 The instrument shall use static load test equipment with a scale value of not less than 7.kV. E, E, 2 The simulated hole shall use a steel pipe with a wall thickness not less than mr or a concrete test support with a H resistance of more than 3CM1a. The mold hole is usually 3cm long and the length becomes 100m. The simulation is consistent with the actual temperature. 6.6.3 The test bar is heated to a temperature of (22 ± 1). Use fast-type or fast-acting anchoring agents that match the aperture of the quick-drilling hole. Its performance should comply with the provisions of MT146.:-202.
6.6.4 Mixing
Use a 1.2kW coal telephone to stir the resin anchor in the test room. Knead it until the bottom is supported by the whole rotation. The stirring time is 25-205. After the stirring stops, hold for a while (SF is fast return) or 48 medium speed): loosen the coal electric drill and the connection table after burning. 6.6.5 Determine the
fast-type resin anchor 30nin. Fast-type resin anchor 13ra. Use a tensile meter to determine the test pull-out resistance. 6.7 Pallet bearing capacity test
When carrying out bearing capacity test on butterfly shadow board, place the pallet or material testing machine on the position without center hole of the board, and then load it. The loading rate is 10--kV. The maximum load before the plate reaches 30 is the maximum load capacity.
MT/T942—2005
7 Inspection rules
7. 1 Inspection classification
Product inspection is divided into factory inspection and type inspection. 7.2 Inspection items
Product factory inspection type and type inspection items are shown in Table 1. Stock number
External quality
Size
Pin tool right room
Expansion sample Household steel wool strength
Anchor inspection static defect performance
Pulling resistance
Bearing capacity of cabinet
7.3 Factory inspection
Table 1 Inspection items
Unqualified station classification
Technical requirements
5. 2. 2.5. 4
Factory inspection items shall comply with the provisions of this standard. Those that do not comply shall not be shipped out of the factory. 7.4 Type inspection
When any of the following circumstances occurs, the product shall be subject to type inspection. New products or old products may be transferred to the factory for production. When the structure, chemistry and process of the formally produced products have changed significantly, which may affect the product performance, the products produced by the factory shall be subject to type inspection once every two years. When the product has been discontinued for more than one year and resumed production; when the factory inspection results are significantly different from the last type inspection; when the relevant national departments put forward the requirement for type inspection, the products for type inspection shall be randomly selected from the qualified products according to the provisions of CB/1011-8. The sampling format adopts GB/T2829-2002, and the sampling plan and relevant data are shown in Table 2. Table 2 Type inspection sampling requirements and related digital display system
Non-conforming
Non-quality level,
8 Packaging, marking, transportation and storage
8. 1 Packaging
Sampling
+1 fixed number certificate [A,-R, two
Sample size
Except for special requirements in the supply contract, the mining screws shall be packed in separate pieces, the system shall be packed in single or several pieces, and the main components such as the shaped or disc-shaped packing tools shall be packed in boxes. 9.2 Marking
The available screws shall adopt different marking methods according to different packaging shapes. The product packaging surface or outer surface shall have clear product types, Mr/T 942-2535
model, manufacturer's production date, certificate of conformity, etc. The product production instructions can be delivered in the package or in other convenient forms. 8.3 Transportation and storage
Mining anchor cables should be handled with care during transportation and loading, and should not be handled randomly to ensure that the product is not damaged or contaminated. After the cable is manufactured and used, it should be placed in a dry and clean place to avoid corrosion and oil pollution when stored for a long time. MT/T942—25
A.1 Design bearing capacity of mining anchor cables
Appendix A
(Normative appendix)
Calculation of design bearing capacity of mining anchor cables
The design bearing capacity of mining anchor cables is calculated by formula A.1. N. -m.n+$,+R.www.bzxz.net
Rongzhong·
The design bearing capacity of the cat rope before expansion, in Newton (N), N
The control coefficient of the tensile stress of the mine cat case, the value is not greater than 0.601-Number of velvet poles:
S,-The unit of the virtual surface area of a single root is square ice (r); R. The tensile strength of the adjustment line, in megawatts (MPa), n
. (A.1)
B.1 Safety factor of mine case
(informative reduction)
The safety factor of mine case and the maximum force are calculated according to the formula (B.1), K-
Wuzhong:
The safety factor of mine case, K is not less than.5! R
Maximum expansion capacity: Unit is Newton (N)
N,—The available cable bearing capacity, unit is Newton (N). B. 2 Maximum force of mining anchor
Maximum force of mining anchor is calculated according to formula (B2>m. R
W+AS.R.
Mining cable quantity, single guard model ():
Efficiency coefficient of catalytic converter (take 0.U5):
Steel strand root summary:
Single strand root number and product, unit, square millimeter! r) Steel strand tensile strength, sheep unit is mega (MI2). MT/T942-—2005
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