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NB/T 11261-2023Code of practice for construction and quality acceptance of freezing holes in coal mines (English PDF)

煤矿冻结孔施工及质量验收规范

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

May 26, 2023

Implementation date

November 26, 2023

Scope

NB/T 11261-2023 is the English-translated version of 煤矿冻结孔施工及质量验收规范.

NB/T 11261-2023 governs the drilling of freezing holes used when coal mine shafts are sunk by the ground freezing method, and how those holes are accepted. Construction preparation covers drilling rig foundations, selection of rigs, inclinometers and correction tools, drill tower erection, the mud circulation system and mud preparation.

The drilling clauses address setting out, spudding, drilling, inclination surveys, deviation prevention and correction, and compiling survey data. Quality limits apply to hole depth and spacing, deviation, annular space filling and green construction, followed by acceptance rules separating main control items from general items.

An annex gives the original construction record sheet. Issued on 26 May 2023, it has applied since 26 November 2023.

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Document preview — NB/T 11261-2023

National Standard of the People's Republic of China

ICS: 73.020
Classification: D 15

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

Preface
1 Scope
2 Normative reference documents
3 Terms and Definitions
4 Construction preparation
4.1 Basic requirements
4.2 Preparation
4.3 Drilling rig foundation construction
4.4 Drilling rig equipment selection
4.5 Selection of inclinometer and correction equipment
4.6 Drill tower installation
4.7 Mud circulation system
4.8 Mud preparation
5 Freeze hole construction
5.1 Measurement and setting out
5.2 Freezing hole opening
5.3 Freeze hole drilling
5.4 Frozen hole inclinometer
5.5 Freeze hole anti-deviation
5.6 Correction of frozen holes
5.7 Compilation of inclinometer data
5.8 Drilling rig dismantling
6 Construction quality requirements
6.1 Hole depth and hole spacing quality requirements
6.2 Drilling deflection quality requirements
6.3 Annular space filling quality requirements
6.4 Green construction requirements
7 Freezing hole acceptance
7.1 Basic requirements
7.2 Main control project inspection method
7.3 General project inspection methods
Appendix A (informative) Original record sheet for coal mine freezing hole construction Reference

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

1 Scope

This document stipulates the construction preparation, construction process, equipment selection, and construction quality requirements for frozen holes in coal mines, and stipulates the quality inspection of frozen holes. Collection method.

This document is applicable to the construction and quality acceptance of frozen holes when drilling shafts in coal mines using the freezing method.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB 12523 Environmental noise emission standards at construction site boundaries

GB/T 15663.2 Coal mine scientific and technological terminology Part 2: Tunnel engineering

GB 50057-2010 Design Code for Lightning Protection of Buildings

GB/T 50905 Green construction specifications for construction projects

GB/T 51277 Mine shaft freezing method construction and quality acceptance standards

GB/T 51288 Mine inclined shaft freezing method construction and quality acceptance standards

MT/T 1054 Mining Drilling Gyro Inclinometer

MT/T 1124 Technical Specifications for Coal Mine Freezing Method for Shaft Excavation Engineering

3 Terms and definitions

The terms and definitions defined in GB/T 15663.2 and the following apply to this document.

3.1 Freezing hole

Drill holes for installing the freezer. [Source: GB/T 15663.2-2008,3.6]

3.2 Hole depth

The length of the drilling axis. [Source: GB 9151-1988,5.3.2]

3.3 Target area

On a certain horizontal plane, the allowable deviation range of the drilling trajectory landing point. [Source: GB/T 51277-2018, 2.0.13, with modifications]

3.4 Borehole inclination survey

Measure the deflection amount and deflection direction of the frozen hole at different depths.

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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

Similar standards

NB/T 11330-2023|NB/T 10222-2019|GB/T 51288-2018|NB/T 11645-2024|NB/T 11259-2023|GB/T 51300-2018

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