ISO 19426-7:2021

INTERNATIONAL ISO
STANDARD 19426-7
First edition
2021-05
Structures for mine shafts —
Part 7:
Rope guides
Structures de puits de mine —
Partie 7: Guides-câbles
Reference number
ISO 19426-7:2021(E)
©
ISO 2021

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ISO 19426-7:2021(E)

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ISO 19426-7:2021(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 4
5 Materials . 8
6 Disturbing actions . 8
6.1 Coriolis force . 8
6.2 Aerodynamic loads . 9
6.2.1 Steady state . . 9
6.2.2 Buffeting . 9
6.2.3 Air density .10
6.3 Rope torque .10
6.3.1 Head rope torque .10
6.3.2 Tail rope torque . .11
6.3.3 Torque applied by multiple ropes .11
6.4 Eccentric conveyance loading .11
6.5 Winder emergency braking .12
6.6 Thermal actions on headframe .12
6.7 Wind load on conveyances.12
7 Restoring forces .12
7.1 Rope guide tension .12
7.2 Rope guide stiffness .13
7.2.1 Stiffness of rope guides .13
7.2.2 Stiffness of head and tail ropes .13
8 Conveyance trajectory .15
8.1 Simulation of conveyance behaviour .15
8.2 Combination of actions .15
9 Design procedure .15
9.1 Function of rope guides .15
9.2 Risk assessment .15
9.3 General design procedure .15
9.4 Simple design procedure .16
9.4.1 Limits on parameters .16
9.4.2 Design requirements .16
9.5 Comprehensive design procedure .16
10 Minimum clearances .17
10.1 Design clearances .17
10.2 Dynamic displacement envelope .17
10.3 Reduced dynamic clearances .17
10.4 Use of rubbing ropes .18
11 Construction and installation tolerances .18
11.1 Shaft vertical cylinder diameter .18
11.2 Tolerance of associated structures .18
11.3 Tolerance on rope guide tension .18
11.4 Commissioning .18
11.4.1 Commissioning procedure .18
11.4.2 Components of the commissioning procedure .18
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ISO 19426-7:2021(E)

12 Other design considerations .19
12.1 General .19
12.2 Loading and unloading of conveyances .19
12.3 Accessing intermediate levels .19
12.4 Number of rope guides .19
12.5 Rope guide positions .19
12.6 Rope guide construction .19
12.7 Rope guide tension and factor of safety .20
12.8 Rope guide attachments .20
12.9 Shafts with more than one winder .20
12.10 Design life .20
12.11 Rope guide tensioning .20
12.11.1 Gravity tensioning devices .20
12.11.2 Hydraulic tensioning devices .20
13 Assessment of existing installations .21
13.1 General .21
13.2 Application of measurements .21
13.3 Upgrades or modifications .21
14 Inspection and maintenance .22
14.1 Deterioration mechanisms .22
14.1.1 General.22
14.1.2 Wear .22
14.1.3 Corrosion .22
14.1.4 Mechanical damage .22
14.1.5 Broken wires .22
14.2 Inspections .22
14.2.1 General.22
14.2.2 Inspection intervals .22
14.2.3 Visual inspection .22
14.2.4 Non-destructive inspection .22
14.3 Maintenance actions .23
14.3.1 Maintenance intervals .23
14.3.2 Lubrication .23
14.3.3 Rope turning and rope lifting .23
14.3.4 Equalisation of hoist rope tensions .23
14.4 Rope guide discard criteria .23
14.5 Rope guide attachments .23
Annex A (informative) Load combinations and displacement multipliers .24
Annex B (informative) Introduction to Annexes B to F, and basic parameters .26
Annex C (informative) Preliminary aerodynamic coefficients .35
Annex D (informative) Rope torque factors .44
Annex E (informative) Rope guide stiffness and tension .46
Annex F (informative) Approximate calculation of conveyance displacement .50
Bibliography .53
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ISO 19426-7:2021(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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 82, Mining.
A list of all parts in the ISO 19426 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
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ISO 19426-7:2021(E)

Introduction
Many mining companies, and many of the engineering companies that provide designs for mines,
operate globally so ISO 19426 was developed in response to a desire for a unified global approach to
the safe and robust design of structures for mine shafts. The characteristics of ore bodies, such as
their depth and shape, vary in different areas so different design approaches have been developed and
proven with use over time in different countries. Bringing these approaches together in ISO 19426 will
facilitate improved safety and operational reliability.
The majority of the material in ISO 19426 deals with the loads to be applied in the design of structures
for mine shafts. Some principles for structural design are given, but for the most part it is assumed that
local standards will be used for the structural design.
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INTERNATIONAL STANDARD ISO 19426-7:2021(E)
Structures for mine shafts —
Part 7:
Rope guides
1 Scope
This document specifies the design loads and the design procedures for the design of rope guides
and rubbing ropes used for guiding conveyances and preventing collisions in vertical mine shafts for
permanent operations. It covers personnel and material hoisting, as well as rock hoisting installations.
There are no fundamental limitations placed on the size of conveyances, the hoisting speeds, shaft
layout configurations, or the shaft depth.
This document can be applicable to shaft sinking operations when kibbles run on the stage ropes.
There are many reasons, based on technical, timing, and cost factors, why rope guides are selected
or not for a particular application, following careful assessment at feasibility stage of any project
where rope guides are considered. This document provides some comments regarding the advantages
and disadvantages of using rope guides compared to rigid guides, and specific design aspects for
consideration when using rope guides. However, it is primarily intended to provide the technical
information required to ensure good engineering of shafts where rope guided hoisting is the chosen
solution.
This document does not cover matters of operational safety.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
ISO 19426-1, Structures for mine shafts — Part 1: Vocabulary
ISO 19426-2, Structures for mine shafts — Part 2: Headframe structures
ISO 19426-5, Structures for mine shafts — Part 5: Shaft system structures
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19426-1 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org
3.1
cheeseweight
stack of weights, usually steel castings, suspended from the bottom of a rope guide forming a dead
weight tensioning system
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ISO 19426-7:2021(E)

3.2
direct collision
event in which a conveyance strikes another conveyance or some other surface that is essentially
transverse to the direction of travel of the conveyance
Note 1 to entry: See Figure 1 a).
3.3
oblique collision
event in which a conveyance strikes a shaft side wall or some other surface that is oriented essentially
parallel with the direction of travel of the conveyance
Note 1 to entry: See Figure 1 b).
a) Direct collision
b) Oblique collision
Figure 1 — Schematic of possible collision types
3.4
design clearance
static clearance
nominal distance between different conveyances, or between conveyances and fixed objects, in the
shaft, as shown on the design drawings
3.5
design location
intended location of elements of the rope guided hoisting installation, as shown on the design drawings
3.6
displacement multiplier
factor by which the predicted conveyance lateral displacement is multiplied to make statistical
allowance for inaccuracies in simulation and aerodynamic coefficients and construction tolerances
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ISO 19426-7:2021(E)

3.7
dynamic clearance
minimum distance between different conveyances, or between conveyances and fixed objects, in the
shaft during hoisting in the shaft, which is equal to the design clearance (3.4) less the maximum dynamic
displacement (3.8)
3.8
dynamic displacement
lateral displacement of conveyances while travelling in the shaft
3.9
design dynamic displacement
lateral dynamic displacement (3.8) of conveyances while travelling in the shaft multiplied by the
displacement multiplier (3.6), which makes provision for simulation uncertainties and construction
inaccuracies
3.10
reduced dynamic clearance
minimum distance between different conveyances, or between conveyances and fixed objects, in the
shaft during hoisting in the shaft, which is equal to the design clearance (3.4) less the design dynamic
displacement (3.9)
3.11
entry point
position at which a conveyance enters fixed guides at the top and bottom ends of the hoisting cycle, and
at any intermediate stations
3.12
guide block
guide bush
guide slipper
attachment of a conveyance to the rope guides
Note 1 to entry: The guide block is usually made in two halves to bolt around the rope guide, and it has a guide
block liner forming the rubbing surface on the rope guide.
3.13
intermediate loading station
loading station between bank level or a tipping station at the top of the shaft and a loading station at the
bottom of the shaft, or any loading station located more than 100 m below the top anchor point of the
rope guides or more than 100 m above the bottom anchor point of the rope guides
3.15
rope guide shoe
mounting to secure the guide block (3.12) through which the rope guide passes to the conveyance
3.16
rubbing block
fixed guide slippers
contact point between a conveyance and the fixed guides at top and bottom of winding cycle, which can
run within or outside the fixed guide
Note 1 to entry: Where the fixed guides are located close to the rope guides, the rubbing block can also serve the
purpose of the rope guide shoe.
3.17
rubbing rope
rope located between conveyances running on rope guides, intended to deflect conveyances away from
each other, thereby reducing the severity of a possible collision
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ISO 19426-7:2021(E)

3.18
vertical shaft cylinder
maximum circular cylinder, clear of any obstructions, that fits within the excavated mine shaft and
constructed infrastructure
3.19
winder emergency braking
winder trip-out
braking of the winder under emergency conditions, such as loss of electrical power, detection of over-
tension or under-tension on the hoist ropes, or accident to shaft signal
4 Symbols
2
a Conveyance acceleration, m/s
2
A Area of the relevant side of a conveyance, m
C
2
A Cross sectional steel area of a single head rope, m
R
2
A , A Area of specified portions of a shaft cross-section, m
1 2
b Thickness of skip stiffeners, m
B Distance between the conveyance centre of gravity and the geometrical centre of the set of
E
rope guides, guiding that conveyance, m
B , B Plan dimensions of a conveyance, m
X Z
C , C Basic aerodynamic lateral force coefficient in appropriate direction, taken as 0,018
BX BZ
C Aerodynamic force coefficient
L
C , C Aerodynamic lateral force coefficient in appropriate direction
LX LZ
C Conveyance passing buffeting force coefficient
LP
C Torque factor applied to head ropes
Q
-1
C Coefficient of thermal expansion of the rope guide, ˚C
T
d Shaft diameter, m
S
d Rope diameter, m (note that this is usually given in mm in hoist rope catalogues)
R
D Lateral conveyance displacement due to steady state aerodynamic force, m
A
D Lateral conveyance displacement due to buffeting forces, m
B
D Lateral conveyance displacement due to Coriolis force, m
C
D Lateral conveyance displacement at the bottom of the conveyance due to conveyance eccen-
EB
tricity with respect to the head rope attachment point, m
D Lateral conveyance displacement at the centre of gravity of the conveyance due to convey-
EC
ance eccentricity with respect to the head rope attachment point, m
D Lateral conveyance displacement at the top of the conveyance due to conveyance eccentricity
ET
with respect to the head rope attachment point, m
D General lateral displacement of the centre
...