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NB/T 11542-2024Technical specification for cage type cable to floor bolt-grouting support in coal mine roadway (English PDF)

煤矿巷道笼式锚索底板锚注支护技术规范

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

May 24, 2024

Implementation date

November 24, 2024

Scope

NB/T 11542-2024 is the English-translated version of 煤矿巷道笼式锚索底板锚注支护技术规范.

NB/T 11542-2024 is the Chinese energy industry specification for floor bolt-grouting support with cage type anchor cables in coal mine roadways under high stress and in broken surrounding rock.

It covers support design, starting from site investigation and geomechanical assessment, then support materials, construction, quality inspection of the work and monitoring of the support afterwards.

Definitions explain the cage type cable, the grouting extension tube fitted ahead of the metal grouting pipe, and the reinforcement time for re-supporting. An informative annex shows how the W steel guard plate for the anchors is made. Issued on 24 May 2024, it has applied since 24 November 2024.

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Document preview — NB/T 11542-2024

National Standard of the People's Republic of China

ICS: 73.040
Classification: D 24

Issued by: National Energy Administration of the People's Republic of China

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Support design
5 Support materials
6 Support construction
7 Construction quality inspection
8 Support monitoring
Appendix A (Informative) Anchor W steel guard plate processing
References

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.

1 Scope

This document specifies the support design, support materials, support construction, construction quality inspection and other aspects of cage anchor cable bottom plate anchor grouting support technology for coal mine tunnels. Measurement and support monitoring.

This document is applicable to the full-section anchor-grouting support equipment of tunnels with cage anchor cables for floor support under high stress and broken surrounding rock conditions in coal mines. Design, construction, quality inspection and support monitoring.

2 Normative references

The contents of the following documents constitute 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 50086 Technical specification for rock and soil anchor and shotcrete support engineering

GB/T 35056-2018 Technical specification for bolt support in coal mine tunnels

MT146.1-2011 Resin anchors Part 1: Anchoring agents

MT/T 942 Mining Anchor Cable

NB/T 11445 Technical specification for full-length prestressed anchor cable support for mining

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Cage type cable

An anchor cable that supports a plurality of cage-like structures in a steel strand anchoring section.

3.2 Spout extension tube

A hose connected to a deep hole in front of a metal grouting pipe has a grouting hole arranged on its body.

3.3 Reinforce time

After the initial support of the tunnel, the surrounding rock continues to be damaged, and the time for re-supporting before the surrounding rock deformation, crack depth, number, and opening suddenly increase. Interval.

4 Support design

4.1 Site investigation and geomechanical assessment of tunnel surrounding rock

The on-site investigation and geomechanical assessment of tunnel surrounding rock shall be carried out in accordance with the requirements of GB/T 35056.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

MT146.1-2011

Similar standards

NB/T 51030-2015|NB/T 11445-2023|NB/T 11536-2024|NB/T 11551-2024|NB/T 11446-2023|GB 50419-2017

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