Compacted strand ropes
1 Scope
This standard specifies the terms and definitions, classification and mark, order content, materials, technical requirements, test methods, inspection rules, acceptance methods, packaging, marking, and product quality certificate, as well as safe use and maintenance of compacted strand ropes.
This standard is applicable to compacted strand ropes [hereinafter referred to as "rope(s)"] used for mine shaft lifting, blast furnace hoisting, large pouring, petroleum drilling, large hoisting, boat, offshore facility, aerial ropeway, construction machinery and hoisting machinery, etc.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 238 Metallic materials - Wire - Reverse bend test
GB/T 239.1 Metallic materials - Wire - Part 1: Simple torsion test
GB/T 1839 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products
GB/T 2104 Steel wire ropes - Packing, marking and certificate - General requirements
GB/T 8358 Steel wire ropes - Determination of measured breaking force
GB/T 8706 Steel wire ropes - Vocabulary, designation and classification
GB/T 21965 Steel wire ropes - Vocabulary for acceptance and defect
GB/T 29086 Steel wire ropes - Safety - Use and maintenance
NB/SH/T 0387 Wire rope greases
YB/T 081 Rule for rounding off of numberical values and judgement of testing values for technical standards of metallurgy
YB/T 4452 Fibre cores for steel wire ropes
YB/T 4613 Greases for steel wire rope
YB/T 5343 Steel wire for ropes
YB/T 5357 Non-ferrous metallic coatings on steel wire - Zinc or zinc-5% aluminum alloy coating
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 8706 and the following apply.
3.1
compacted strand
strand in which the wire shape and the strand size are changed while the metal cross-sectional area of the wire remains basically unchanged after deformation processing such as die drawing, rolling, or forging
Note: Quoted from GB/T 8706-2017.
3.2
rope lay length
distance between the two corresponding points where the outer strand makes one complete turn (or helix) about and is parallel to the rope axis (see Figure 1)
Figure 1 Lay length (of 6-strand rope)
3.3
lay direction of rope
lay direction of outer strands in the rope along the rope axis, that is, right lay (Z) or left lay (S) (see Figure 2)
Figure 2 Lay direction of strand in rope
3.4
ordinary lay
lay mode in which the lay direction of wire in the outer strand is opposite to that of the outer strand in the rope (see Figure 3)
Note: The first lowercase letter indicates the lay direction of the strand, and the second uppercase letter indicates the lay direction of rope.
Figure 3 Ordinary lay
3.5
lang lay
lay mode in which the lay direction of wire in the outer strand is the same as that of outer strand in the rope (see Figure 4)
Note: The first lowercase letter indicates the lay direction of the strand, and the second uppercase letter indicates the lay direction of rope.
Figure 4 Lang lay
4 Classification and mark
4.1 Classification
According to the principles given in GB/T 8706, the ropes are divided into single-layer rope, rotation-resistant rope and parallel-closed rope, as shown in Table 1.
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Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and mark
5 Order content
6 Materials
7 Technical requirements
9 Inspection rules
10 Acceptance method
11 Packaging, marking and quality certificate
12 Safe use and maintenance of rope
Annex A (Normative) Table for the minimum breaking force corresponding to rope type, diameter and grade
