ISO 19426-2:2026

• Abstract:

  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.

• Status: Published
• Publication Date: 14-Sep-2026
• ICS: 73.020 - Mining and quarrying
• Technical Committee: ISO/TC 82 - Mining
• Drafting Committee: ISO/TC 82/WG 4 - Structures for mine shafts
• Current Stage: 6060 - International Standard published
• Start Date: 15-Sep-2026
• Due Date: 15-Sep-2026
• Completion Date: 15-Sep-2026

• Revises: ISO 19426-2:2018 - Structures for mine shafts — Part 2: Headframe structures
• Effective Date: 16-Sep-2023

Overview

ISO 19426-2:2026, published by the International Organization for Standardization (ISO), specifies the structural design requirements for headframe structures at mine shafts. This standard outlines the essential design loads and procedures necessary for both permanent and sinking operations, ensuring that headframes and their foundations can reliably support the equipment and activities at the head of vertical and decline mine shafts.

This document is designed for use by structural engineers, mining companies, equipment manufacturers, and regulators who are involved in the planning, construction, and operations of mine shaft headframes. By adopting a limit states design philosophy, ISO 19426-2:2026 promotes consistency and safety in mining infrastructure worldwide.

Key Topics

• Design Loads: The standard covers comprehensive load cases, including permanent loads (such as equipment weight and static components), imposed loads (e.g., personnel platforms, bin material, wind, earthquake), rope or conveyance installation loads, rope-operating loads, and emergency loads.
• Design Procedures: Guidance is provided on evaluating structural reliability, selecting load factors, and combining loads to achieve robust headframe designs. Requirements are given for serviceability as well as ultimate limit states.
• Materials Specification: Structural steel, concrete, and timber are covered, with appropriate references to other ISO standards for material properties and construction quality.
• Component Coverage: The document encompasses all relevant headframe structures and their foundations, including those required for winding and sinking ropes, conveyance guides, rope guides, equipment for loading/unloading, safety devices, and maintenance equipment.
• Exclusions: The standard does not address operational safety nor the layout or arrangement of the headframe.

Applications

ISO 19426-2:2026 is essential for:

• Engineering Design: Structural designers of mine shaft headframes use this standard to determine appropriate load cases and develop robust, compliant designs for new or modified mine headframes in both permanent and temporary (sinking) roles.
• Construction Planning: Contractors reference these requirements when selecting construction methods and materials to ensure compliance with international best practices.
• Equipment Integration: Headframes must safely accommodate heavy and dynamic loads from winding equipment, conveyances, rope guides, and maintenance or safety devices. This standard ensures all anticipated operational and installation activities are considered in the design.
• Maintenance and Upgrades: When planning upgrades or modifications, ISO 19426-2:2026 provides a consistent benchmark for verifying whether existing structures can accommodate new loads or altered operating conditions, such as the addition of modern winding equipment or revised emergency arrest features.
• Regulatory Compliance: Mining authorities and regulators may use this standard when evaluating mine designs for approvals or safety compliance, ensuring that structural reliability and occupant safety are systematically addressed.

Related Standards

ISO 19426-2:2026 forms part of a wider series on structures for mine shafts, allowing for coordinated application with:

• ISO 19426-1: Vocabulary specific to mine shaft structures.
• ISO 19426-3: Sinking stage structures and their requirements.
• ISO 19426-4: Conveyance structures, including detailed load cases for bins, chutes, and conveyance operations.
• ISO 2394: General principles on reliability for structures.
• ISO 3010: Basis for seismic design and earthquake load assessments.
• ISO 19338: Performance requirements for concrete structures.
• ISO 12122-1: Parameters for timber structural elements.
• ISO 17607-1: Steelwork requirement standards.
• ISO 22111: General requirements for structure design.

By adhering to ISO 19426-2:2026, stakeholders ensure mine shaft headframes are designed using an internationally recognized framework, addressing both standard and exceptional load scenarios, promoting global safety, reliability, and operational efficiency in mining shaft infrastructure.

International
Standard
ISO 19426-2
Second edition
Structures for mine shafts —
2026-09
Part 2:
Headframe structures
Structures de puits de mine —
Partie 2: Chevalements
Reference number
© ISO 2026
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ii
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 .6
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 .7
6.4.5 Rope guide and rubbing rope operating loads .7
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 .9
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

iii
7.4.2 Deflection limits .10
7.4.3 Headframe-mounted winders .10
Annex A (informative) Load factors and load combinations .11
Bibliography .13

iv
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
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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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.
This second edition cancels and replaces the first edition (ISO 19426-2:2018), which has been technically
revised.
The main changes are as follows:
— bin and chute material loads cross-referenced to ISO 19426-4;
— earthquake loads to be evaluated using a risk assessment;
— additional clarity on the emergency rope loads.
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.

v
Introduction
Many mining companies, and many of the engineering companies which provide designs for mines, operate
globally so ISO 19426 series 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 series will facilitate improved
safety and operational reliability.
The majority of the material in ISO 19426 series 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
International Standard ISO 19426-2:2026(en)
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 17607-1, Steel structures — Execution of structural steelwork — Part 1: General requirements and terms
and definitions
ISO 19338, Performance requirements for standards on concrete structures
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 terminology 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

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
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 tensioning
T
r
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 factor
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 loa
...