LY/T 2146-2024 English PDF

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LY/T 2146-2024: Non-destructive testing method and defects classification for wooden components of ancient buildings
Status: Valid

LY/T 2146: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
LY/T 2146-2024	239	Add to Cart	3 days	Non-destructive testing method and defects classification for wooden components of ancient buildings	Valid
LY/T 2146-2013	319	Add to Cart	3 days	Method for non-destructive testing and decay classification of wood element of ancient architecture	Obsolete

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Basic data

Standard ID: LY/T 2146-2024 (LY/T2146-2024)
Description (Translated English): Non-destructive testing method and defects classification for wooden components of ancient buildings
Sector / Industry: Forestry Industry Standard (Recommended)
Classification of Chinese Standard: B70
Classification of International Standard: 79.080
Word Count Estimation: 12,184
Date of Issue: 2024-02-07
Date of Implementation: 2024-06-01
Older Standard (superseded by this standard): LY/T 2146-2013
Issuing agency(ies): State Forestry and Grassland Administration

LY/T 2146-2024: Non-destructive testing method and defects classification for wooden components of ancient buildings

---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.
ICS 79.010 CCSB60 Forestry Industry Standard of the People's Republic of China Replace LY/T 2146-2013 Non-destructive testing of wooden components of ancient buildings Methods and decay classification Released on 2024-02-07 2024-06-02 Implementation The State Forestry and Grassland Administration issued

Table of Contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Tools and instruments 2 5 Detection methods and scope of application 2 5.1 Visual inspection, cone piercing and tapping 2 5.2 Pyroprobe test method 2 5.3 Resistance meter test method 3 5.4 Stress wave detection method 3 5.5 Comprehensive application of detection methods 3 6 Calculation 4 6.1 Increase rate of penetration depth of the nail probe 4 6.2 Resistance meter resistance value reduction rate 4 6.3 Stress wave detection defect rate 4 7 Defect classification of wood components 4 Appendix A (Informative) Record of Defects of Wooden Components of Ancient Buildings 7

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. This document replaces LY/T 2146-2013 "Non-destructive testing methods and decay classification of wooden components of ancient buildings" and is compatible with LY/T 2146- Compared with.2013, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Added the term and definition of “stress wave detection” (see 3.5); b) Changed “instruments and equipment” to “tools and instruments” (see Chapter 4, 5 of the.2013 edition); c) Changed "probe detector" to "nail probe detector" (see 4.3, 5.2 of the.2013 edition); d) Added "stress wave detector" and parameter requirements (see 4.5); e) Added "Wood Moisture Content Rapid Detector" and parameter requirements (see 4.7); f) "growth cone" was deleted (see 5.4 of the.2013 edition); g) Changed “Testing procedures” to “Testing methods and scope of application” (see Chapter 5, Chapter 6 of the.2013 edition); h) Added "stress wave detection method" and related application scope and detection process (see 5.4); i) Deleted “Growth cone detection” (see 6.2.2 of the.2013 version); j) Added the calculation of “stress wave detection defect rate” (see 6.3); k) Added quantitative indicators for describing the decay status of wood components (see Table 1, Table 1 of the.2013 edition); l) Added “wood component insect damage classification” and status description and quantitative indicators (see Table 2); m) Changed the description of the classification of wood defects by nail probe test (see Table 3, Table 2 of the.2013 edition); n) Changed the description of the resistance meter test classification of wood defects (see Table 4, Table 3 of the.2013 edition); o) Added “Stress wave detection classification of wood component defect levels” (see 7.5); p) Added "The defect classification of the same part or the same wood component is based on the comprehensive determination of all the above test results" (see 7.6). 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 State Forestry and Grassland Administration. This document is under the jurisdiction of the National Technical Committee on Timber Standardization (SAC/TC41). This document was drafted by. Wood Industry Research Institute of Chinese Academy of Forestry, Guangzhou Baiyun Cultural Relics Protection Engineering Co., Ltd., Jiangsu Huidian New Materials Co., Ltd., Chengdu Cultural Relics and Archaeology Research Institute, Beijing Forestry University, China Cultural Relics Protection Foundation, Xi'an Jiaotong University, Xi'an Construction University of Science and Technology of China, MCC General Research Institute of Building and Construction Co., Ltd., and Shandong Jianzhu University. The main drafters of this document are. Ma Xingxia, Huang Rongfeng, An Xin, Wang Xiaohuan, Chen Xiaoning, Chen Yue, Zhang Yudong, Li Jinwen, Zhang Houjiang, Yang Shuyan, Xie Qifang, Zhang Wenge, Ge Zhedong, Zhang Bin, Wang Shuangyong, Fang Xuan, and Wang Yanhua. The previous versions of this document and the documents it replaces are as follows. ---First published in.2013 as LY/T 2146-2013; ---This is the first revision. Non-destructive testing of wooden components of ancient buildings Methods and decay classification

1 Scope

This document specifies the testing methods and scope of application, result calculation and defect classification of wooden components for non-destructive testing of ancient building timber components. This document is applicable to the defect detection and defect classification of wooden components of ancient buildings. This document can be used as a reference for defect detection of wooden components of modern buildings.

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/T 14019-2009 Terminology for wood preservation GB/T 28990-2012 Code for non-destructive testing of internal decay and elastic modulus stress waves of wooden components of ancient buildings GB 50005-2017 Timber Structure Design Code

3 Terms and definitions

The terms and definitions defined in GB/T 14019-2009, GB/T 28990-2012 and GB 50005-2017 and the following terms and definitions apply This document. 3.1 woodencomponents The wooden parts that can be divided into the most basic units in wooden structure buildings. 3.2 Non-destructive testing Without destroying the original characteristics, stress conditions and final use of the wood, the decay, defects and physical and mechanical properties of the wood are Detection. 3.3 Under the action of fixed force, a micro probe such as a nail is driven into the wood, and the degree of wood defects is judged according to the change of the needle penetration depth. A non-destructive testing method. Note. The test results are expressed as relative values, that is, the percentage change of the penetration depth of the defective wood relative to the penetration depth of the non-defective wood. 3.4 Resistance testing The resistance meter's microprobe is inserted into the wood, and the density of the wood and the degree of internal decay and development are determined based on the resistance encountered by the probe as it moves forward. A non-destructive detection method for defects such as cracks and scars. Note. The test results are expressed as relative values, that is, the percentage change of the resistance value of defective wood relative to the resistance value of non-defective wood. ......

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