ISO 17745:2016

INTERNATIONAL ISO
STANDARD 17745
First edition
2016-05-01
Steel wire ring net panels —
Definitions and specifications
Panneaux de filet en anneaux de fil d’acier — Définitions et
spécifications
Reference number
ISO 17745:2016(E)
©
ISO 2016

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ISO 17745:2016(E)

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ISO 17745:2016(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 ring net panels . 2
6 Properties of wire . 3
6.1 Ageing and corrosion resistance . 3
6.1.1 Zn class A . 3
6.1.2 Zn95Al5 class B . 4
6.1.3 Zn95Al5 class A . 4
6.1.4 Advanced metallic coatings (as Zn90Al10) class B . 4
6.1.5 Advanced metallic coatings (as Zn90Al10) class A . 4
7 Wire net properties . 4
8 Wire ring net properties (longitudinal tensile test with no lateral contraction and
load bearing capacity test) . 4
9 Sampling and testing . 4
10 Inspection and documentation . 5
Annex A (informative) Possible metallic coating options . 6
Annex B (informative) Load bearing capacity tests . 8
Annex C (informative) Net tensile strength (longitudinal tensile test with no
lateral contraction) .13
Annex D (informative) Methods for measuring the dimensions of a ring net panel .15
Bibliography .16
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ISO 17745:2016(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.
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INTERNATIONAL STANDARD ISO 17745:2016(E)
Steel wire ring net panels — Definitions and specifications
1 Scope
This International Standard specifies the characteristics of steel wire ring net panel 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 produced from metallic-
coated steel wire or advanced metallic coating.
It is not applicable to anchors or soil nails for fixing of steel mesh to an unstable slope.
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 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 7989-2:2007, 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
ISO 22034-2:2007, Steel wire and wire products — Part 2: Tolerances on wire dimensions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
wire ring
steel ring obtained by looping a single steel wire with ends inserted into the thread or secured by one
or more than one ferrules
3.2
nominal wire diameter
diameter used to designate the wire
Note 1 to entry: It is expressed in millimetres (mm).
3.3
real wire diameter
average value of the minimal and the maximal diameter, measured in the same section of a straight
piece of wire, by means of a micrometer to 0,01 mm
3.4
wire ring size
average value of the diameter of the single ring
Note 1 to entry: See Figure 1.
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ISO 17745:2016(E)

Figure 1 — Ring size
3.5
wire ring net panel
structure of the panel net, made by rings connected with the contiguous rings
3.6
advanced metallic coating
metallic coating with a non-specified composition and having a superior corrosion resistance
3.7
dimensions of a panel
length and width expressed in metres or in number of rings
Note 1 to entry: See Annex D.
3.8
ring structure
way that the ring is manufactured and constituted
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.
5 Wire ring net panels
Wire ring net panels are ring panels where each ring is made by several loop bindings, each one obtained
by looping a single steel wire. Each ring is connected with four or six contiguous rings in order to create
a net as shown in Figure 2.
For the connection of the panels, shackles or wire rope shall be used. The strength of the connection
formed shall be equal to or greater than the tensile strength of the ring net panel.
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ISO 17745:2016(E)

a) Four contiguous rings b) Six contiguous rings
Figure 2 — Example of ring wire net panel layout
The wire ring net panels shall comply with the specifications given in Table 1.
Table 1 — Properties and possible combinations of wire ring net panels
a b c,d
Standard ring diameter Standard windings Wire diameter
mm n mm
7
300 9 3
350 12 4
420 16
19
a
Other ring diameters and wire diameters are possible, in accordance with project design requirements.
b
Other number of windings are possible, in accordance with project design requirements.
c
By agreement, other values should be provided.
d
Tolerances of metallic coated wire diameter are in accordance with class T1 in ISO 22034-2:2007, Table 1.
6 Properties of wire
The wires shall comply with the diameter and tolerances as specified in Table 1, with the coating as
specified in Table A.1, and with the coating weight as specified in ISO 7989-2.
Method of assessment and acceptance criteria for zinc and zinc alloy coating weight are described in
ISO 7989-2:2007, Clause 5.
The tensile strength of the wire used for rings shall be minimum 1 380 MPa. The tensile strength of the
wire used for rings shall be tested in accordance with ISO 22034-1.
6.1 Ageing and corrosion resistance
6.1.1 Zn class A
When subjected to the neutral salt spray test according to the procedures given in ISO 9227, after a
period of 500 h of exposure, the ring samples shall not show more than 5 % of DBR.
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ISO 17745:2016(E)

6.1.2 Zn95Al5 class B
When subjected to the neutral salt spray test according to the procedures given in ISO 9227, after a
period of 500 h of exposure, the ring samples shall not show more than 5 % of DBR.
6.1.3 Zn95Al5 class A
When subjected to the neutral salt spray test according to the procedures given in ISO 9227, after a
period of 1 000 h of exposure, the ring samples shall not show more than 5 % of DBR.
6.1.4 Advanced metallic coatings (as Zn90Al10) class B
When subjected to the neutral salt spray test according to the procedures given in ISO 9227, after a
period of 1 000 h of exposure, the ring samples shall not show more than 5 % of DBR.
6.1.5 Advanced metallic coatings (as Zn90Al10) class A
When subjected to the neutral salt spray test according to the procedures given in ISO 9227, after a
period of 2 000 h of exposure, the ring samples shall not show more than 5 % of DBR.
7 Wire net properties
The chain of three rings is mounted in a calibrated test traction rig and it is connected to the machine
with two circular elements of 50 mm diameter, not less than four times the diameter of the strand.
Before the test, a slight tension is given to stabilize the system, then the force is reduced again to zero
before the test starts.
The chain of three rings is tensioned by the test machine with a recommended displacement speed of
2 mm/s, until breaking (see Figure 2).
The chain of three rings breaking load is reached when the chain is no longer able to support any
increase of the applied force. Tests shall be performed on a minimum number of three samples.
The tensile test machine shall be of class 1 according to ISO 7500-1.
Figure 3 — Scheme of the test on net rings
8 Wire ring net properties (longitudinal tensile test with no lateral contraction
and load bearing capacity test)
Tensile strength and load bearing capacity tests are described in Annex B and Annex C.
Tensile strength and load bearing capacity tests are indications of product performance and quality.
The use of the results for design purposes shall be based on an engineering judgement in accordance
with the experience and the current practice and site conditions.
9 Sampling and testing
The manufacturer is responsible for the control of product quality.
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ISO 17745:2016(E)

10 Inspection and documentation
If agreed at the time of ordering, a certificate according to ISO 10474 shall be supplied containing the
following data:
— product description;
— manufacturer’s name and address;
— quantity of products supplied;
— wire coating (type and class);
— ma
...