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www.ChineseStandard.net Database: 189760 (18 Oct 2025)

GB 142-2013 English PDF

US$139.00 · In stock
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GB 142-2013: Logs for pit-props
Status: Valid

GB 142: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 142-2013	English	139	Add to Cart	3 days [Need to translate]	Logs for pit-props	Valid	GB 142-2013
GB 142-1995	English	199	Add to Cart	2 days [Need to translate]	Logs for direct--Pit-props	Obsolete	GB 142-1995
GB 142-1984	English	RFQ	ASK	3 days [Need to translate]	Logs for direct use	Obsolete	GB 142-1984
GB 142-1958	English	RFQ	ASK	3 days [Need to translate]	(Chinese National Standard)	Obsolete	GB 142-1958

PDF similar to GB 142-2013

Standard similar to GB 142-2013

GB/T 18107 LY/T 2407 LY/T 1184 GB/T 155 GB/T 143 GB 154

Basic data

Standard ID	GB 142-2013 (GB142-2013)
Description (Translated English)	Logs for pit-props
Sector / Industry	National Standard
Classification of Chinese Standard	B68
Classification of International Standard	79.040
Word Count Estimation	6,645
Older Standard (superseded by this standard)	GB 142-1995
Quoted Standard	GB/T 144; GB/T 4814; GB/T 17659.1
Regulation (derived from)	National Standards Bulletin No. 22 of 2013
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies: prop the technical requirements, test methods and volume measurement. This standard applies to: Coal mine as pillars, brackets and other purposes wood.

GB 142-2013: Logs for pit-props

---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.
Logs for pit-props ICS 79.040 B68 National Standards of People's Republic of China Replacing GB 142-1995 Pit prop Issued on. 2013-11-12 2014-09-11 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

Article 3.3 of this standard are mandatory, the rest are recommended. This standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard replaces GB 142-1995 "direct use of wood prop", compared with the GB 142-1995 main changes are as follows. --- "Direct use of wood prop" name to "prop"; --- Used as a prop for the species is not allowed to make a note; --- Increased requirements for longitudinal crack defects; --- Increasing the 13cm diameter class material, and the provisions of the diameter class volume is calculated; --- Increase the "pit volume tables" (see Appendix A); --- Increased sampling of the product. Please note that some of the content of this document may involve patents. Release mechanism of the present document does not assume responsibility for the identification of these patents. This standard by the National Standardization Technical Committee timber (SAC/TC41) and focal points. This standard was drafted. Heilongjiang Provincial Academy of Forestry, China Coal Energy Datun Coal and Electricity Company, Heilongjiang Provincial Institute of Wood Science. The main drafters of this standard. Songrun Hui, Gong Renmei, put off, Li River, Wang Wei Qi, Xu Bin, plum gold, Tie force, Zhang Dongmei, Zhangshan Jun, Liu Decheng. This standard replaces the standards previously issued as follows. --- GB 142-1958, GB 142-1984, GB 142-1995. Pit prop

1 Scope

This standard specifies the technical requirements of the pit prop, test methods and measurement volume. This standard applies to coal mine for wood pillars, brackets and other purposes.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 144 timber inspection GB/T 4814 original timber volume table GB/T 17659.1 sawn timber batch inspection Sampling and judging methods - Part 1. Wood batch inspection Sampling and judging methods

3 Technical requirements

3.1 Species Sonko hard species and broadleaf species. The following species can not be used as a prop. (. Paulowniaspp) fir and pine fir (A.holophylla), Paulownia, to be alder (Alniphyllum fortunei), sweetgum (L.Formosana), alder (Alnusspp.), A. davidii (A.davidii), lacquered (Toxicodendronspp.), Rhus (Rhusspp.). 3.2 Dimensions and tolerances 3.2.1 gauging length. 2.2m ~ 4.0m, 0.2m press upgrade, 5.0m, 6.0m. 3.2.2 seized foot diameter. 12cm ~ 24cm, less than 14cm by 1cm upgrade, enhance foot 0.5cm, 0.5cm insufficient rounding; 14cm Press 2cm above upgrade, enhance foot 1cm, 1cm less rounding. 3.2.3 Gauging length deviation. 6-2cm. 3.3 defects allowable limit Defects shall comply with the allowable limit specified in Table 1. Table 1 deficiency allowable limit Name defect allowable limit Must not have internal leakage section full range of timber length Not allowed to have a full timber within the sapwood decay long range Must not have heartwood decay within the full range of timber length Poles have not allowed within the scope of the subject-foot Table 1 (continued) Name defect allowable limit bending The maximum camber height and length in the song level ratio. Gauging length 4.0m below ≤3%; gauging length 4.0m, 5.0m, 6.0m of ≤5% Trauma, Pianku radial depth with the gauge diameter ratio ≤10% Burst, not allowed to have the wind in the wood off the subject-foot range Longitudinal crack length with the gauge length ratio of ≤30%

4 Test methods and volume measurement

4.1 Sampling According to GB/T 17659.1 regulations. 4.2 size calibration Performed in GB/T 144 requirements. 4.3 Evaluation Material Performed in GB/T 144 requirements. 4.4 Volume measurement Performed in GB/T 4814 regulations. SIZE 12cm, 13cm of the original volume by the small-diameter timber volume calculation formula, the diameter level 14cm ~ 24cm volume of timber volume is calculated according to the original 14cm above calculation. 4.5 volume table Volume table in Appendix A.

Appendix A

(Normative) Pit volume tables Table A.1 pit volume tables Inspection foot diameter cm Gauging length/m 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 5.0 6.0 Volume/m3

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