MT/T 5015-1996 English PDFUS$1159.00 · In stock
Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. MT/T 5015-1996: Code for quality inspection of engineering supported by bolting and shotcrete
Basic dataStandard ID: MT/T 5015-1996 (MT/T5015-1996)Description (Translated English): Code for quality inspection of engineering supported by bolting and shotcrete Sector / Industry: Coal Industry Standard (Recommended) Word Count Estimation: 36,332 Summary: This standard applies to coal mine roadway shotcrete support engineering quality testing, does not apply to prestressed cable, steel fiber shotcrete, steel mesh reinforcement support and quality testing. Quality testing other mine shaft, traffic tunnels, hydraulic tunnel and various rooms and other underground works really shotcrete support can also reference use. MT/T 5:---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Code for quality inspection of engineering supported by bolting and shotcrete ContentsForeword Ⅱ About publishing Notice of "Quality Inspection Regulations for Anchor Shotcreting Support Engineering" Coal-based Character [1996] No. 118 III 1 General 1 2 Shotcrete strength detection 1 3 Shotcrete thickness detection 4 4 Anchor Installation Quality Inspection 5 5 Anchor pullout force detection 6 6 Engineering specifications, quality of look and feel and depth detection of sprayed concrete foundation 7 Appendix A Common Tools for Quality Inspection of Anchor Shot Support Engineering 9 Appendix B Relationship between Appearance Characteristics and Test Data of Shotcrete Core 11 Appendix C Method for Establishing the Strength Formula of Shotcrete 12 Appendix D. Point Load Method for Testing Shotcrete Strength Record Table 13 Appendix E. Test Record of Shotcrete Strength by Pull-out Method 14 Appendix F Random sampling methods 15 Appendix G Shotcrete Thickness Test Record Form 16 Appendix H Anchor Installation Quality Inspection Record Form 17 Appendix J Test Record of Anchor Pullout Force 18 Appendix K Engineering Specification Test Record Form 19 Appendix L Engineering Inspection Quality Inspection Record Form 20 Appendix M Glossary 21ForewordThe Quality Inspection Regulations for Anchor Shot Support Projects are based on the requirements of the Ministry of Coal Industry's Coal Regulation Letter (1994) No. 115, issued by Shandong Mining Prepared by the College in conjunction with the Luzhou Mining Bureau. During the compilation process, the compilation team of "Quality Inspection Regulations for Anchor Shotcreting Support Engineering" conducted extensive investigation and research. "Construction and acceptance specifications", "Technical specifications for anchor shotcrete support", "Concrete strength inspection and evaluation standards", "Quality of mine shaft engineering Inspection and Evaluation Standards and other relevant quality requirements for bolted shotcrete support engineering have drawn on mature scientific research results and new technologies in recent years, especially The research results of the "eighth five-year" key scientific and technological key project "anchor shotcrete support construction quality detection technology" as an important basis for the preparation of this procedure, widely The opinions of relevant units and experts were solicited, and trials were conducted. Finally, the Ministry of Coal Industry organized a review and finalization. This regulation is divided into 6 chapters and 13 appendices. The point load method specified in the regulations measures the strength of sprayed concrete and the method of detecting the distance between bolts. Methods for testing the quality of bolts and shotcrete support projects such as testing method, ultrasonic testing project section specifications, etc. are not available in other related domestic standards; dial-out test method For testing the strength of shotcrete, the Ministry of Railways and the Ministry of Metallurgy have corresponding industry standards. This method is adopted for the first time in the coal industry standards. During the implementation of this procedure, all units hope to earnestly accumulate information and sum up experience. Where there is a need to modify or add, please comment and relevant The materials were sent to the Management Group of “Quality Inspection Regulations for Anchor Shot Support Engineering” of Shandong University of Mining and Technology for future reference. February.1996 Notice on Issuing the "Quality Inspection Regulations for Anchor Shot Support Engineering" Coal-based word [1996] No. 118 According to the requirements of the Coal Regulation Letter [1994] No. 115 issued by the Ministry of Coal Industry, the Ministry entrusted Sex industry standards, effective October 1,.1996. This regulation is managed and explained by the Ministry of Coal Industry. Ministry of Coal Industry of the People's Republic of China April 4,.19961 General1.0.1 In order to standardize, standardize, and scientificize the quality inspection technology for anchor rods and shotcrete (hereinafter referred to as anchor shotcrete) support engineering in coal mines, To ensure the quality of anchor and shotcrete support engineering in wells and lanes, this regulation is specifically formulated. 1.0.2 This regulation is applicable to the quality inspection of anchor and shotcrete support engineering in coal mine shafts. It is not applicable to prestressed anchor cable, steel fiber shotcrete, steel frame. Support and reinforcement mesh quality inspection. Quality inspection of anchor and shotcrete support in underground mines, mine tunnels, traffic tunnels, hydraulic tunnels and various chambers Test can also refer to the use. 1.0.3 This code is mainly based on the national standards "Code for Construction and Acceptance of Mining and Tunnel Engineering", "Concrete Strength Inspection and Evaluation Standard", "Anchor Related specifications and standards such as the Technical Specifications for Pole Shotcrete Support and related industry standards such as the Standards for Quality Inspection and Evaluation of Coal Mine Tunnel Engineering, Prepared by specifications. 1.0.4 The material inspection and comprehensive evaluation of the engineering quality of the bolt and shotcrete support engineering of coal mine shafts shall be in accordance with the current The relevant provisions of the Evaluation Standards are implemented. 1.0.5 After the concrete at the detection site is damaged, it should be filled with mortar in time. 1.0.6 The quality inspection of anchor and shotcrete support engineering in coal mine shafts shall comply with the current national standards and the current industry standards in addition to the provisions of this Regulation. Relevant regulations.2 Shotcrete strength testing2.1 General provisions 2.1.1 This chapter is applicable to concrete strength detection using shotcrete support in coal mine tunnel engineering. 2.1.2 The strength testing of shotcrete should adopt the point load test method or the pull-out test method, and the sprayed plate cutting method or chisel cutting method can also be used. Do not use the test block method. 2.1.3 When using the point load test method or the pull-out test method to measure the strength of shotcrete, the layout of the test points should meet the following requirements. a) The concrete surface around the measuring point should be flat and avoid honeycombs and holes; b) There should be no reinforced or embedded iron in the concrete within 60mm around the measuring point; c) The distance between two adjacent measuring points should not be less than 250mm, and the distance from the edge of the concrete should not be less than 150mm; d) The thickness of the concrete at the test site should not be less than 50mm. 2.2 Point load test method 2.2.1 The point load test method is to use a concrete drill to drill a cylindrical core sample from the concrete spray body and use a point load meter to test its point load. Load strength, and then determine the concrete strength detection method based on the point load strength. 2.2.2 The point load test method consists of two parts. sampling and point load test. The sampling section includes sampling rigs and diamond thin-wall drill bits, And with water cooling system. The point load test device includes a manual oil pump, a hollow oil cylinder, a loading cone, a pressure measuring device and an oil pipeline. Commonly used For equipment, see Appendix A of this regulation. 2.2.3 The point load test method for detecting the strength of shotcrete should meet the following requirements. a) Sampling. 1) The machine should be placed smoothly during sampling to avoid impact and vibration; 2) The core sample should be complete, the diameter of the core sample should be greater than 1.5 times the diameter of the coarse aggregate of sprayed concrete, and the length of the core sample should not be less than 1.1 times. b) Point load test. 1) The loading point should be located in the middle part of the core sample length, and the distance from either end should not be less than the core sample radius.The line connecting the two loading points should pass through the section circle. Heart, that is, it must be loaded radially; 2) The location of the loading point should be the smooth and complete surface of the core sample, and avoid the re-spraying surface, rupture surface and air holes; 3) The core sample should be pressurized slowly and uniformly, and the loading speed should be less than 0.2MPa/s. 2.2.4 The point load test data obtained by one of the following situations must be discarded. a) The core sample is damaged along the multiple spray surface or the interface between the spray layer and the surrounding rock; b) the core-like fracture surface does not pass two loading points, or passes only one loading point; c) the angle between the core-like rupture surface and its axis is less than 45 °; d) There is a significant difference between the test data and the appearance characteristics of the core sample.Under normal circumstances, the appearance characteristics of the shot concrete core sample are related to the test data See Appendix B of this Regulation. 2.2.5 Load strength I of shotcrete core sample point, calculated according to formula (2.2.5). I = Af (2.2.5) Where L P --- failure load (N); Af --- area of core-like failure surface (mm2); I --- point load strength (MPa); 2.2.6 The compressive strength of shotcrete shall be calculated based on the point load strength of shotcrete according to formula (2.2.6). f'cu, i = ab · Ii (2.2.6) Where. f'cu, i --- the compressive strength value (MPa) of the sprayed concrete core sample at the i-th measuring point, accurate to 0.05MPa; Ii --- point load strength of sprayed concrete at the i-th measuring point (MPa); a --- constant term; b --- regression coefficient. Formula (2.2.6) is a general formula for calculation, and the specific strength calculation formula can be established according to the method described in Appendix C of this regulation. 2.2.7 The point load method for testing the strength of shotcrete can be recorded in accordance with the requirements of Appendix D of this code. 2.3 Pull-out test method 2.3.1 The pull-out test method refers to drilling, grooving and installing a reamer in a concrete spray body to perform a pull-out test, and the spray is determined according to the limit pull-out force. Compressive strength of shot concrete (see Figure 2.3.1). Figure 2.3.1 Schematic diagram of the pull-out test method 2.3.2 The pull-out test device should include drilling, grooving, and pulling out three parts of the machine. For common implements, see Appendix A of this code. 2.3.3 The pull-out test shall meet the following requirements. a) When drilling, the drill bit should be kept perpendicular to the concrete surface at all times. mm hole wall must be smooth; b) If the surface of the sprayed concrete is not flat, the surface treatment around the hole location should be flat before drilling; c) Cut a circular groove at a distance of 25 mm from the hole in the borehole (the distance from the plane of the groove adjacent to the hole to the hole). d) The pressure for pulling out should be slow and uniform, and the loading speed should be less than 0.2MPa/s; e) The pull-out test should be carried out until the concrete has just started to break, and the oil pressure gauge reading no longer increases. 2.3.4 After the pull-out test, the damage of the concrete at the test points should be checked. Under normal circumstances, the concrete failure surface should be a basically regular conical surface. 2.3.5 Test data obtained from one of the following situations must be discarded; a) no damage occurred; b) only a small part of the concrete in the bearing ring or bearing point is damaged; c) the ring groove is irregular, or the distance between the groove and the concrete surface is less than; d) After pulling out the damage, the damage surface is a very irregular conical surface; e) The meter reading is obviously abnormal. 2.3.6 According to the pull-out force Fi of the sprayed concrete at the measurement point, the compressive strength value of sprayed concrete f'cu, i can be calculated according to formula (2.3.6). f'cu, i = ab · Fi (2.3.6) Where. f'cu, i --- the compressive strength (MPa) of shot concrete at the i-th measuring point, accurate to 0.05MPa; Fi --- pullout strength of sprayed concrete at the i-th measuring point (kN); a --- constant term; b --- regression coefficient. Equation (2.3.6) is the general formula for calculating the compressive strength of shotcrete. The specific calculation formula can be established according to the method described in Appendix C of this procedure. 2.3.7 The strength of shotcrete measured by the pull-out method can be recorded in accordance with the requirements of Appendix E of this code. 2.4 Test procedures 2.4.1 According to the type of project and the size of the project, determine the number of sprayed concrete strength check points according to Table 2.4.1. 2.4.2 The random sampling method is used to determine the location of the checkpoint. For details, see Appendix F of this Regulation. Table 2.4.1 Number of checkpoints Number of project types Quantity check points 1 not less than 1 every 20 ~ 30m 2 Not less than 1 every 30 ~ 50m in inclined wells, flat concrete and roadways 3 硐 室 1000m3 or more but not less than 5 500 ~ 1000m3 not less than 3 500m3 or more 4 Other independent projects 50 ~ 100m3 or less than 50m3 not less than 1 2.4.3 Take 5 concrete core samples at each inspection point, or select 5 measurement points for drilling and slot expansion.The core samples or measurement points should be evenly distributed on the inspection break. On the surface perimeter; or use the large spray plate method or the chisel method to make three 100mm × 100mm × 100mm cube test pieces. 2.4.4 Perform point load tests on concrete core samples, pull-out tests on boreholes, or compression tests on cube specimens. 2.5 Quality Evaluation 2.5.1 Cube test blocks made by spraying large plate method or chisel method are used to test the strength of sprayed concrete. National Standards (Concrete Strength Inspection and Evaluation Standards) Articles 3.0.2 and 3.0.3. 2.5.2 The strength of shotcrete is measured by the point load method or the pull-out method.The determination of the representative value of the strength of the checkpoint shall meet the following requirements. a) Calculate the arithmetic mean value based on the strength values of the five test points at the same checkpoint as the representative value of the concrete strength at the checkpoint; b) When the difference between the maximum or minimum of the 5 test points and the intermediate value exceeds 15% of the intermediate value, take the intermediate value as Is the representative value of the intensity of the checkpoint; c) When the difference between the maximum value and the minimum value of the five test points and the intermediate value exceeds 1.5% of the intermediate value, the check point The strength should not be used as a basis for evaluation. 2.5.3 The strength and quality of shotcrete shall be judged by statistical or non-statistical methods. 2.4.4 Sampling test is used to evaluate the sprayed concrete of important projects, and the number of check points is 10 or more. The strength of sprayed concrete should meet the requirements of equations (2.5.4-1) and (2.5.4-2). mfcu-λ1Sfcu≥0.9fcu, k (2.5.4-1) fcu, min≥λ2fcu, k (2.5.4-2) Where. mfcu-the average compressive strength of sprayed concrete at n checkpoints (MPa); λ1, λ2 --- Qualification determination coefficients, selected according to Table 2.5.4; fcu, k --- standard value of compressive strength of sprayed concrete (MPa); fcu, min --- the minimum value of compressive strength of sprayed concrete at n checkpoints (MPa); Sfcu --- the standard deviation (MPa) of the compressive strength of sprayed concrete at n checkpoints, calculated according to the formula 2.5.4-3, when the calculated value of Sfcu is less than When 0.06fcu, k, take Sfcu = 0.06fcu, k. Sfcu = i = 1 (fcu, i-mfcu) 2 n-1 (2.5.4-3) Where. fcu, i --- representative value of compressive strength of sprayed concrete at the i-th checkpoint (MPa); n --- The total number of checkpoints. When the strength of shotcrete at the check point meets the requirements of this article, the compressive strength of shotcrete of the project is judged to be acceptable. Table 2.5.4 Eligibility factor for shotcrete compressive strength n 10 ~ 14 15 ~ 24 ≥25 λ1 1.70 1.65 1.60 λ2 0.90 0.85 2.5.5 The shotcrete of general engineering and important engineering with less than 10 inspection points can be evaluated by non-statistical methods. The strength of its shotcrete should meet the following requirements. a) The average compressive strength of sprayed concrete at n checkpoints is not lower than the standard value; b) The minimum value of compressive strength of sprayed concrete at n checkpoints shall not be less than 85% of the standard value. Jet coagulation that meets the requirements of this section The soil strength was judged to be acceptable.3 Shotcrete thickness detection3.1 General provisions 3.1.1 This chapter applies to the thickness detection of sprayed concrete. 3.1.2 In sprayed steel mesh reinforced concrete, the spray thickness of the steel mesh to the rock surface, the spray thickness detection of the outer protective layer of the steel mesh, and the steel frame spray coagulation In the soil, the thickness of the steel frame and the rock surface, and the thickness of the outer protective layer of the steel frame shall be tested in accordance with the current "Quality Inspection and Evaluation Standards for Coal Mine Lane Engineering". Relevant regulations are implemented. 3.2 Detection method 3.2.1 The thickness of shotcrete can be measured by acupuncture method before the shotcrete is set, and it can also be measured by perforating rule or core method. 3.3 Testing procedures 3.3.1 Determine the number of spray layer thickness check points according to Table 3.3.1, but each test should not be less than 3 check points. Table 3.3.1 Pitch thickness checkpoint spacing Project type. vertical shaft, inclined shaft, flat shaft, roadway, chamber Checkpoint distance (m) ≯15 ≯20 3.3.2 Select 3 measuring points uniformly in the checkpoint section. 3.3.3 The thickness of sprayed concrete shall be recorded at any time and may be recorded in accordance with the requirements of Appendix G of this code. 3.4 Quality Evaluation 3.4.1 Measurement points with spray thickness not less than 90% of the design value are judged as passing, and measurement points not less than the design value are judged as excellent. 3.4.2 The spray layer thickness of 75% or more of the test points meets the qualification requirements, and the spray layer thickness of the other test points does not affect the safe use. And the minimum thickness is not less than 50% of the design value. The inspection point is qualified. If the checkpoints meet the eligibility requirements and 50% or more of them The test points meet the good regulations, and the check points are excellent. 3.4.3 The thickness of the sprayed layer at each inspection point meets the qualification require...... |
