ISO 19426-2:2018

INTERNATIONAL ISO
STANDARD 19426-2
First edition
2018-05
Structures for mine shafts —
Part 2:
Headframe structures
Structures de puits de mine —
Partie 2: Chevalements
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Materials . 3
6 Nominal loads . 3
6.1 Permanent loads . 3
6.1.1 General. 3
6.1.2 Equipment permanent loads . 3
6.1.3 Additional permanent loads . 4
6.1.4 Crash beam anchor guy pre-tension loads . 4
6.2 Imposed loads (excluding rope loads). 4
6.2.1 General. 4
6.2.2 Floor and platform loads . 4
6.2.3 Bin material loads and chute material loads . 4
6.2.4 Conveyance operating loads . 4
6.2.5 Headframe-mounted winder loads . 4
6.2.6 Kibble loads . 5
6.2.7 Bank door operating loads . 5
6.2.8 Abnormal loads . 5
6.2.9 Earthquake loads . 5
6.2.10 Conveyance drop test loads . 5
6.3 Rope or conveyance installation loads . 5
6.3.1 General. 5
6.3.2 Winding rope installation load . 6
6.3.3 Winding rope doubling-down load . 6
6.3.4 Tail rope installation or replacement load . 7
6.3.5 Rope guide and rubbing rope installation or replacement load . 7
6.3.6 Conveyance change over load . 7
6.4 Rope operating loads . 7
6.4.1 General. 7
6.4.2 Winding rope operating loads . 7
6.4.3 Stage rope operating loads . 7
6.4.4 Lateral rope operating loads on sheaves . 8
6.4.5 Rope guide and rubbing rope operating loads . . 8
6.5 Emergency loads . 8
6.5.1 Emergency rope load . 8
6.5.2 Emergency dropback loads . 9
6.5.3 Crash beam and catch plate loads . 9
6.5.4 Emergency arrestor anchor loads . 9
6.5.5 Headframe-mounted winder emergency loads . 9
6.5.6 Energy release loads following rope break .10
6.5.7 Dogging system loads .10
7 Design procedures .10
7.1 Design loads .10
7.2 Design standards .10
7.2.1 Design for emergency rope loads .10
7.3 Overall stability .10
7.4 Serviceability limit state .10
7.4.1 General.10
7.4.2 Deflection limits .11
7.4.3 Headframe-mounted winders .11
Annex A (informative) Load factors and load combinations .12
Bibliography .14
iv © ISO 2018 – All rights reserved

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 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 the following
URL: 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.
Introduction
Many mining companies, and many of the engineering companies which 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.
vi © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 19426-2:2018(E)
Structures for mine shafts —
Part 2:
Headframe structures
1 Scope
This document specifies the design loads and the design procedures for the structural design of
headframe structures of mine shafts and their components for permanent and sinking operations. The
headframe includes all structures and their foundations, that are required at the head of all vertical
and decline mine shafts for the purposes of supporting and installing winding and sinking ropes,
conveyance guides, rope guides and rubbing ropes, equipment for loading and unloading conveyances,
safety devices, as well as ancillary sinking and maintenance equipment. The headframe also includes
the bank and sub-bank levels.
This document does not cover matters of operational safety or layout of the headframe.
This document adopts a limit states design philosophy.
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 2394, General principles on reliability for structures
ISO 3010, Bases for design of structures — Seismic actions on structures
ISO 12122-1, Timber structures — Determination of characteristic values — Part 1: Basic requirements
ISO 10721-1, Steel structures — Part 1: Materials and design
ISO 19338, Performance and assessment requirements for design standards on structural concrete
ISO 19426-1, Structures for mine shafts — Part 1: Vocabulary
ISO 19426-3, Structures for mine shafts — Part 3: Sinking stage
ISO 19426-4, Structures for mine shafts — Part 4: Conveyances
ISO 22111, Bases for design of structures — General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19426-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org
4 Symbols
D rope or conveyance installation load (N)
D winding rope doubling-down load (N)
dd
D rope guide or rubbing rope installation load (N)
g
D winding rope installation load (N)
h
D tail rope installation or replacement load (N)
t
D conveyance change-over load (N)
v
E emergency load (N)
E rope emergency load (N)
r
E and E tensions in the ropes on each side of the winder drum (N)
r1 r2
E energy release load following rope break (N)
re
E short circuit torque (Nm)
st
E winder brake failure load (Nm)
wb
e base for natural logarithms (mathematical constant)
F design load or load effect (N, Nm)
F pre-tension load of the crash-beam-anchor guy (N)
ag
F kibble load applied to the bank doors (N)
k
g gravity acceleration constant (m/s )
G permanent load or load effect (N, Nm)
G additional permanent load or load effect from rope guides and rubbing ropes (N)
a
G conveyance self-weight (N)
c
G weight of the relevant length of winding rope, rope guide or rubbing rope (N)
r
G weight of the relevant length of tail rope, rope guide or rubbing rope (N)
t
L full length of the rope guide or rubbing rope (m)
m unit mass of the rope guide or rubbing rope (kg/m)
r
n number of winding ropes
P payload used during doubling-down (N)
Q imposed load or load effect (excluding rope load) (N, Nm)
Q dominant imposed load or load effect under consideration (N, Nm)
Q to Q additional independent imposed loads or load effects (N, Nm)
3 n
R varying rope guide or rubbing rope horizontal load under operating conditions (N)
h
2 © ISO 2018 – All rights reserved

R varying rope guide or rubbing rope vertical load under operating conditions (N)
v
R to R rope operating loads (N)
1 n
minimum tension in a rope guide or rubbing rope, or the weight of the suspended ten-
T
r
sioning block (N)
T short circuit torque (Nm)
st
W weight of kibble and payload (N)
K
α rope or conveyance impact factor
c
α horizontal impact factor
ch
α temperature factor
cv
α short circuit torque impact factor
st
α vertical impact facto
v
μ coefficient of friction between winding rope and winder drum
γ partial load factor for all loads when combined with the rope emergency load (= 1,05)
e
γ partial load factor for permanent load
γ partial load factor for rope-operating load
f1
γ partial load factor for the dominant imposed load
f2
γ to γ partial load factors for imposed load
f3 fn
∑R governing combination of rope-operating loads under consideration
θ angle of wrap of winding rope on winder drum
Ψ to Ψ load combination factors.
3 n
5 Materials
The materials used in the construction of headframes shall be structural steel complying with
ISO 10721-1, structural concrete complying with ISO 19338 or structural timber complying with
ISO 12122. The material used shall be specified on the structural drawings.
6 Nomina
...