NB/T 10729-2021General technical conditions of metal mesh for roadway support in coal mine (English PDF)
煤矿巷道支护用金属网通用技术条件
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
November 16, 2021
Implementation date
February 16, 2022
Scope
NB/T 10729-2021 is the English-translated version of 煤矿巷道支护用金属网通用技术条件.
NB/T 10729-2021 lays down general technical conditions for the metal mesh used in roadway support in underground coal mines, including woven, diamond and welded meshes.
It sets structural types and specifications, technical requirements, test methods, inspection and acceptance rules, and packaging, marking, transport and storage.
Defined parameters include mesh size, wire diameter, hole pitch and warp wire, while mesh strength is determined in a jacking test with a 500 mm diameter disc, with the mesh fixed between anchor bolts at a set row spacing.
A mesh pocket test reproduces the bolt spacing of the actual support design. Mine operators and mesh manufacturers use it to specify and check support mesh. Issued on 16 November 2021, it has applied since 16 February 2022.
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Document preview — NB/T 10729-2021
National Standard of the People's Republic of China
- Classification
- D 98
Issued by: National Energy Administration of the People's Republic of China
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Structure type and specification
- 5 Technical requirements
- 6 Detection method
- 7 Inspection and Decision Rules
- 8 Packaging, marking, transport and storage of products
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 of Standardization Documents" Drafting.
1 Scope
This document specifies the structural types and specifications, technical requirements, testing methods, inspection and judgment rules, production packaging, marking, transportation and storage of products.
This document is applicable to metal meshes for various roadway support systems in underground coal mines, including woven meshes, diamond meshes, welded meshes, etc.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.
GB/T 228.1-2021 Tensile test of metallic materials - Part 1: Test method at room temperature
GB/T 1499.3-2010 Steel for Reinforced Concrete Part 3: Reinforced Welded Mesh
GB/T 17505-2016 General technical requirements for delivery of steel and steel products
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Mesh pocket test
The mesh pocket test can be carried out on the metal mesh under the condition of the same distance as the design of the underground roadway support system.
3.2 Mesh strength
In the case where the jacking test machine is fixed with a certain row spacing between the anchor rods, the maximum test for the jacking test of the metal mesh is carried out with a 500mm diameter disc. great strength.
3.3 Mesh size
The distance between adjacent warp or weft threads.
3.4 Wire diameter
The diameter of the rebar of the metal mesh.
3.5 Hole pitch
The distance between adjacent filament centerlines.
3.6 Warp wire
All longitudinal wires on the wire mesh.
......
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
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Related Standards
GB/T 17505-2016 — Steel and steel products -- General technical delivery requirements
GB/T 228.1-2021 — Metallic Materials — Tensile Testing — Part 1: Method of Test at Room Temperature
NB/T 10086-2025 — Regulations for Compiling Energy Conservation Reports for Wind Farm Projects
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NB/T 10729-2021
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