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NB/T 11445-2023 English PDF

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NB/T 11445-2023: Technical specification for full-length anchored prestressed cable support of mine roadway
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
NB/T 11445-2023	English	399	Add to Cart	4 days [Need to translate]	Technical specification for full-length anchored prestressed cable support of mine roadway	Valid	NB/T 11445-2023

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Basic data

Standard ID	NB/T 11445-2023 (NB/T11445-2023)
Description (Translated English)	Technical specification for full-length anchored prestressed cable support of mine roadway
Sector / Industry	Energy Industry Standard (Recommended)
Classification of Chinese Standard	D24
Classification of International Standard	73.040
Word Count Estimation	18,190
Date of Issue	2023-12-28
Date of Implementation	2024-06-28
Issuing agency(ies)	National Energy Administration

NB/T 11445-2023: Technical specification for full-length anchored prestressed cable support of mine roadway

---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.
NB/T 11445-2023 English version. Technical specification for full-length anchored prestressed cable support of mine roadway ICS 73.040 CCSD24 Energy Industry Standards of the People's Republic of China Technical specification for full-length prestressed anchor cable support for mines Released on 2023-12-28 2024-06-28 implementation The National Energy Administration released

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Support design 2 4.1 Site investigation and geomechanical assessment of tunnel surrounding rock 2 4.2 Anchor cable support design 2 5 Support materials 4 5.1 General requirements 4 5.2 Material composition 4 5.3 Solid anchor cable 4 5.4 Hollow grouting anchor cable 5 5.5 Resin anchoring agent 5 5.6 Grouting materials 5 5.7 Composite components 6 5.8 Protective net 6 6 Support construction 6 6.1 General Provisions 6 6.2 Drilling 6 6.3 Anchor cable installation 6 6.4 Anchor cable protection 7 6.5 Delayed Grouting 7 6.6 Construction safety requirements 7 7 Construction quality inspection 7 8 Support quality monitoring 8 8.1 Monitoring content 8 8.2 Draw a map of station locations and instrument distribution 8 8.3 Monitoring requirements 8 8.4 Observation frequency 8 8.5 Information Feedback 8 8.6 Monitoring staff training 8 8.7 Archiving System 9

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Coal Industry Association. This document is under the jurisdiction of the Standardization Expert Group of China Coal Industry Association. This document was drafted by. Xinwen Mining Group Co., Ltd., China University of Mining and Technology, Shandong Yanxin Mining Materials Processing Co., Ltd., China Coal Industry Association Productivity Promotion Center, Shandong University of Science and Technology, Shandong Energy New Mine Inner Mongolia Energy Co., Ltd., Shandong Energy GROUP NORTHWEST MINING CO., LTD. The main drafters of this document are. Zhang Nong, Wang Naiguo, Li Xiaoping, Zhang Chuanming, Xie Zhengzheng, Liu Zhijun, Yang Yang, Liu Xuesheng, Guo Wenbo, Yin Yijun, Ren Yongjie, He Zhe, Xiang Zhe, Wu Xiuliang, Lin Xuezhen, Hou Junmin, Li Chen, and Mu Fengchun. Technical specification for full-length prestressed anchor cable support for mines

1 Scope

This document specifies the support design, support materials, support construction, and construction quality inspection of the full-length anchor prestressed anchor cable support technology for mines. And the usage requirements of support quality monitoring. This document is applicable to mines with full-length anchored prestressed anchor cable support.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB 175 General purpose Portland cement GB/T 5224 Steel strand for prestressed concrete GB/T 14370 Anchors, clamps and connectors for prestressed tendons GB/T 35056 Technical specification for bolt support in coal mine tunnels MT/T 146.1 Resin anchors Part 1.Anchoring agents MT/T 861 W-shaped steel strip for mining MT/T 879 Technical Specification for Prestressed Anchor Construction in Coal Mines MT/T 942 Mining Anchor Cable

3 Terms and definitions

The terms and definitions defined in GB/T 5224, GB/T 35056, MT/T 942 and the following apply to this document. 3.1 full-length anchored prestressed cable The mining anchor cable adopts the method of combining end prestressed anchoring with delayed grouting to realize prestressed anchoring support along the entire length of the cable body. Note. There are two types. solid anchor cables with casing-assisted grouting and hollow grouting anchor cables. 3.2 Hollow grouting cable Mining anchor cable consists of hollow tube steel strand, slurry stopper, lock and other related accessories. 3.3 Hollow pipe steel strand holowpipesteelstrand A stranded steel wire bundle is formed by winding several steel wires around the outside of the grouting pipe. 3.4 External grouting pipe externalgroutingpipe External metal or plastic pipe used for grouting of solid anchor cables. 3.5 Point of sudden deterioration of surrounding rock The point where the depth, number and aperture of the cracks in the weak surrounding rock suddenly increase after excavation is located at the critical position where the cracks develop slowly and expand rapidly.

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