Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB 15831-2006 Steel tube scaffold couplers. In addition to structural adjustments and editorial changes, the following main technical changes have been made with respect to GB 15831-2006:
a) The range of nominal outside diameters of steel tubes has been added (see Clause 1 hereof);
b) The classification of coupler products has been modified (see 4.2 hereof; 4.2 of Edition 2006);
c) The requirements for the service life of coupler products have been added (see 5.1 hereof);
d) The requirements for the material of forged coupler products have been added (see 5.2 hereof);
e) The requirements for the weight of coupler products with the nominal outside diameter of steel tube of 48.3mm have been added (see 5.4 hereof).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of the Ministry of Housing and Urban-Rural Development of the People's Republic of China.
This document was firstly issued in 1995 and firstly revised in 2006, and this is the second revision.
Steel tube scaffold coupler
1 Scope
This document specifies the classification, technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage of steel tube scaffold couplers.
This document is applicable to scaffolds, derricks and formwork supports with nominal outside diameter of steel tube of 34mm~76mm in construction and municipal engineering, as well as to metal couplers used in railway, highway, water conservancy, chemical, metallurgical, coal and ship engineering.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 95 Plain washers - Product grade C
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 700 Carbon structural steels
GB/T 867 Round head rivets
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3091 Welded steel pipes for low pressure liquid delivery
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3098.2 Mechanical properties of fasteners - Nuts
GB/T 3159 Hydraulic universal testing machines
GB/T 9440 Malleable iron castings
GB/T 11352 Carbon steel castings for general engineering purpose
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
steel tube scaffold coupler
connecting part made of metal materials for fixing support systems such as steel tube scaffolds and derricks
Note: It is referred to as coupler for short.
3.1.2
right angle coupler
coupler for connecting two perpendicularly crossed steel tubes
3.1.3
swivel coupler
coupler for connecting two steel tubes crossing at any angle
4 Classification
4.1 Coupler types
Couples are classified into right angle couplers, swivel couplers and sleeve couplers according to structural types (see Figure 1).
Foreword II
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Classification
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transportation and storage
Annex A (Informative) Record form of coupler test
