GB/T 4822-2023Sawn timber inspection (English PDF)

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.

This document replaces GB/T 4822-2015 "Sawn Timber Inspection". Compared with GB/T 4822-2015, except for structural adjustments and editorial changes In addition, the main technical changes are as follows:

---Changed terms and definitions (see Chapter 3, Chapter 3 of the 2015 edition);

---Deleted the volume calculation content in the general requirements for "dimensional inspection" (see 4.1.4 of the 2015 version);

---Changed the width inspection requirements for parallel whole-edge sawn timber (see 4.3.1, 2015 version of 4.3.1);

---Changed the sawn timber thickness inspection requirements (see 4.4.1, 2015 version of 4.4.1);

---Changed the set inspection requirements (see 5.2, 2015 version of 5.2);

---Change "blunt edge" to "missing edge", and add "sharp edge" inspection requirements (see 5.6, 2015 version of 5.6);

---Added inspection requirements for sawing defects, resin pockets, distortion, and diamond deformation (see 5.7, 5.9, 5.11, and 5.12);

---Added accuracy requirements for inspection tools (see 6.3);

---Added the "spraying" marking method of the grade mark (see 7.1), and changed the special sawn timber symbol in the sawn timber grade symbol (see Table 1, 2015 version of Table 1);

---Added volume calculation (see Chapter 8).

1 Scope

This document describes the dimensional inspection, material inspection, inspection tools, grade markings and volume calculations for sawn lumber inspection.

This document is applicable to the inspection of sawn timber in the production and circulation fields.

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/T 449 sawn timber volume table

GB/T 4823 Defects in sawn timber

GB/T 11917 Material manufacturing process terminology

GB/T 36202 Sawn timber inspection terminology

3 Terms and definitions

The terms and definitions defined in GB/T 4823, GB/T 11917 and GB/T 36202 apply to this document.

4 Dimensional inspection