Steel wire rope net panels and rolls -- Definitions and specifications

ISO 17746:2016 specifies the characteristics of steel wire rope net panels and rolls for retaining of unstable slopes controlling and preventing rockfalls and loose debris flow along roads, highways and railway, urban areas, mines and quarries, and for snow avalanche protection. Steel wire rope net panels and rolls are produced from metallic-coated wire ropes.

Panneaux et rouleaux de filet en câble d'acier -- Définitions et spécifications

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Status
Published
Publication Date
28-Apr-2016
Current Stage
9020 - International Standard under periodical review
Start Date
15-Apr-2021
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ISO 17746:2016 - Steel wire rope net panels and rolls -- Definitions and specifications
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INTERNATIONAL ISO
STANDARD 17746
First edition
2016-05-15
Steel wire rope net panels and rolls —
Definitions and specifications
Panneaux et rouleaux de filet en câble d’acier — Définitions et
spécifications
Reference number
ISO 17746:2016(E)
ISO 2016
---------------------- Page: 1 ----------------------
ISO 17746:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
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copyright@iso.org
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ii © ISO 2016 – All rights reserved
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ISO 17746:2016(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Description of use and applications ................................................................................................................................................. 2

5 Wire rope net panels ........................................................................................................................................................................................ 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Double knot ................................................................................................................................................................................................ 4

5.3 Clips or staple knot .............................................................................................................................................................................. 4

5.4 Without connection clips ............................................................................................................................................................... 4

6 Properties of wire used in knots .......................................................................................................................................................... 5

6.1 Mechanical properties ...................................................................................................................................................................... 5

6.2 Coating properties ............................................................................................................................................................................... 6

7 Wire rope properties ....................................................................................................................................................................................... 6

8 Rope net properties ........................................................................................................................................................................................... 6

8.1 Ageing and corrosion resistance ............................................................................................................................................. 6

8.1.1 Zn class B ................................................................................................................................................................................ 6

8.1.2 Zn class A ................................................................................................................................................................................ 6

8.1.3 Zn95Al5 class B ................................................................................................................................................................. 6

8.1.4 Zn95Al5 class A ................................................................................................................................................................. 6

8.1.5 Advanced metallic coatings (as Zn90Al10) class B ............................................................................ 6

8.1.6 Advanced metallic coatings (as Zn90Al10) class A ............................................................................ 6

8.1.7 Additional organic coating ...................................................................................................................................... 6

8.2 Maximum breaking load of knot .............................................................................................................................................. 7

8.3 Maximum load of tear break of knot .................................................................................................................................... 7

8.4 Rope net tests (longitudinal tensile test with no lateral contraction and load

bearing capacity test) ........................................................................................................................................................................ 8

9 Sampling and testing ........................................................................................................................................................................................ 8

10 Inspection and documentation ............................................................................................................................................................. 8

Annex A (informative) Possible metallic coating options ............................................................................................................... 9

Annex B (informative) Load bearing capacity tests ...........................................................................................................................11

Annex C (informative) Net tensile strength (longitudinal tensile test with no

lateral contraction) .........................................................................................................................................................................................17

Bibliography .............................................................................................................................................................................................................................19

© ISO 2016 – All rights reserved iii
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ISO 17746:2016(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 17, Steel wire rod and

wire products.
iv © ISO 2016 – All rights reserved
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INTERNATIONAL STANDARD ISO 17746:2016(E)
Steel wire rope net panels and rolls — Definitions and
specifications
1 Scope

This International Standard specifies the characteristics of steel wire rope net panels and rolls for

retaining of unstable slopes controlling and preventing rockfalls and loose debris flow along roads,

highways and railway, urban areas, mines and quarries, and for snow avalanche protection.

Steel wire rope net panels and rolls are produced from metallic-coated wire ropes.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 2408, Steel wire ropes for general purposes — Minimum requirements

ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:

Tension/compression testing machines — Calibration and verification of the force-measuring system

ISO 7989-1, Steel wire and wire products — Non-ferrous metallic coatings on steel wire — Part 1: General

principles

ISO 7989-2:2007, Steel wire and wire products — Non-ferrous metallic coatings on steel wire — Part 2:

Zinc or zinc-alloy coating
ISO 10474, Steel and steel products — Inspection documents
ISO 22034-1, Steel wire and wire products — Part 1: General test methods
EN 10204, Metallic products — Types of inspection documents
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
wire rope net panel

panel made from wire rope (3.2) or ropes arranged in a plain structure and connected at the points of

overlapping by wire knots, by interlinking of the wire ropes or by metallic clips (3.5)

3.2
wire rope
standard steel wire ropes according to ISO 2408
3.3
wire rope net sizes
average value of the net dimensions
Note 1 to entry: Distance between two ropes in the same direction.
© ISO 2016 – All rights reserved 1
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ISO 17746:2016(E)
3.4
knot
point of connecting, overlapping or crossing of the net wire ropes

Note 1 to entry: A knot can be released using wires, clips (3.5) or by twisting the wrapping ropes.

3.5
clips

metallic shell-like elements with fastening tabs to be used for forming connections between

adjacent ropes
3.6
knot without clips

knot (3.4) of panel in which the overlapping points of the wrapping ropes are connected by twisting the

wire ropes (3.2)
3.7
nominal net size
distance between two junctions when measured along any single rope
3.8
dimensions of a panel
length and width expressed in metres
3.9
advanced metallic coating

metallic coating with a not specified composition having a superior corrosion resistance

4 Description of use and applications

The typical use for the considered products is retaining of unstable slopes, controlling and preventing

rockfalls and loose debris flow along roads, highways and railway, urban areas, mines and quarries,

and for snow avalanche protection.
Figure 1 shows some relevant examples of applications of wire rope net panels.
5 Wire rope net panels
5.1 General

Wire rope net panels are made of square nets or other shapes (e.g. triangular, jersey, rhomboidal, etc.)

of nets manufactured with one or more than one rope as shown in Figure 1.
Wire rope net can be manufactured both in panels and in rolls.
2 © ISO 2016 – All rights reserved
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ISO 17746:2016(E)
Key
1 net rope
2 perimetral rope
3 knot
Optional.
Figure 1 — Examples of wire rope net panels and their components
© ISO 2016 – All rights reserved 3
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ISO 17746:2016(E)
The knot can be made in the different ways described in 5.2 to 5.4.
5.2 Double knot

This kind of knot (see Figure 2) is made by two bindings, each one obtained by looping a pair of steel

3,00 mm wires coated with a zinc-aluminium-5 % alloy. The two bindings tightly envelop the ropes

crossing each other.
Key
1 steel wire
2 net rope
Figure 2 — Example of double knot

The use of single knot may be agreed between the supplier and purchaser, provided that performance

to punching tests of the panel meets the project requirement.
5.3 Clips or staple knot

In this kind of panel (see Figure 3), the overlapping points of the wrapping rope are connected using

electro-plated clips, which are made of two half-shells pressure-closed.
Figure 3 — Examples of clips knot and staple knot (patented)
5.4 Without connection clips
See Figure 4.
4 © ISO 2016 – All rights reserved
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ISO 17746:2016(E)

Figure 4 — Example of wire rope net where knot is formed without connection clips

The main properties of the wire ropes panels are specified in Table 1.
Table 1 — Main properties of wire ropes panel
Items Nominal net Net wire ropes Peripheral wire ropes (optional)
size
Diameter (mm) Minimum Diameter (mm) Minimum
b b
and type breaking and type breaking
load load
(kN) (kN)
Wire rope net 250 × 250 8 mm 6 × 7 + WC 40,7 10 mm 6 × 19 + WC 63,0
panel
300 × 300 10 mm 6 × 19 + WC 63,0 12 mm 6 × 19 + WC 90,7
Double knot
400 × 400 12 mm 6 × 19 + WC 90,7 14 mm 6 × 19 + WC 124,0
16 mm 6 × 19 + WC 161,0
Wire rope net 200 × 200 8 mm 6 × 7 + WC 40,7 10 mm 6 × 19 + WC 63,0
panel
250 × 250 12 mm 6 × 19 + WC 90,7
Clips knot
300 × 300 14 mm 6 × 19 + WC 124,0
16 mm 6 × 19 + WC 161,0
Wire rope net rolls 250 × 250 8,6 mm (3 × 4) mm 61,4 12 mm 6 × 19 + WC 90,7
without
275 × 275 6,6 mm (3 × 3) mm 36,7 16 mm 6 × 19 + WC 161,3
connection clips

The tolerance on the net nominal size is ±10 % but can change in relation to the panel dimensions.

b 2
Rope type (see ISO 2408), rope grade 1 770 N/mm .
Other net sizes are possible, in accordance with project design requirements.
6 Properties of wire used in knots
6.1 Mechanical properties

The tensile strength of the wire used in knot shall be a minimum of 350 N/mm . The tensile strength of

the wire used in knot shall be tested in accordance with ISO 22034-1.
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ISO 17746:2016(E)
6.2 Coating properties

The steel wire used in knot must be a nominal minimum diameter of 3,00 mm and coated with a zinc-

aluminium alloy in accordance with the ISO 7989-1 and ISO 7989-2, class A. Method of assessment and

acceptance criteria for zinc and zinc alloy coating weight are prescribed in ISO 7989-2:2007, Clause 5.

Lower wire diameters may be used provided that performance characteristics of the whole net panel

can be demonstrated to be appropriate for the intended use.

The corrosion resistance of the connections (clips, staples, etc.) shall exceed the corrosion resistance of

the ropes after the manufacturing.
7 Wire rope properties

Wire ropes used in wire rope net panels shall be in accordance with ISO 2408:2004, Table 1. Non-ferrous

metallic coatings on steel wire shall be in accordance with ISO 7989-2, class A or class B.

8 Rope net properties
8.1 Ageing and corrosion resistance
8.1.1 Zn class B

When subjected to the neutral salt spray test according to the procedures in ISO 9227, after a period of

200 h of exposure, the net samples shall not show more than 5 % of DBR.
8.1.2 Zn class A

When subjected to the neutral salt spray test according to the procedures in ISO 9227, after a period of

500 h of exposure, the net samples shall not show more than 5 % of DBR.
8.1.3 Zn95Al5 class B

When subjected to the neutral salt spray test according to the procedures in ISO 9227, after a period of

500 h of exposure, the net samples shall not show more than 5 % of DBR.
8.1.4 Zn95Al5 class A

When subjected to the neutral salt spray test according to the procedures in ISO 9227, after a period of

1 000 h of exposure, the net samples shall not show more than 5 % of DBR.
8.1.5 Advanced metallic coatings (as Zn90Al10) class B

When subjected to the neutral salt spray test according to the procedures in ISO 9227, after a period of

1 000 h of exposure, the net sam
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