ISO/FDIS 19426-1

Structures for mine shafts — Part 1: Vocabulary

This document specifies the terms and definitions related to the structures for mine shafts, used throughout ISO 19426. Terms used in mining can vary from conventional engineering usage, and they vary quite considerably between different countries. For this reason, alternative terms are provided in many of the entries. The preferred terms, given in bold type, are those used throughout ISO 19426. It is assumed that users of this document are familiar with mining, so common terms with normal dictionary usage are not defined. Also, no definitions are provided for terms that can be widely used in mining but are not explicitly used in ISO 19426.

Structures de puits de mine — Partie 1: Vocabulaire

General Information

• Status: Not Published
• ICS: 01.040.73 - Mining and minerals (Vocabularies)
• 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: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 25-Jun-2026
• Completion Date: 25-Jun-2026

Relations

• Revises: ISO 19426-1:2018 - Structures for mine shafts — Part 1: Vocabulary
• Effective Date: 16-Sep-2023

Overview

ISO/FDIS 19426-1:2026 - Structures for Mine Shafts - Part 1: Vocabulary is an internationally recognized standard developed by ISO/TC 82, Mining. This document establishes a consistent set of terms and definitions specific to the structures of mine shafts, ensuring clear and unambiguous communication across global mining operations. It is intended for use across the ISO 19426 series, which aims to unify approaches to the safe and robust design of mine shaft structures worldwide.

Mining terminology often differs from conventional engineering language and may vary significantly between countries. To address this challenge, ISO/FDIS 19426-1 includes alternative terms in many entries and emphasizes a set of preferred, standardized terms (in bold) for use throughout the series. The vocabulary covered in this standard supports professionals in mining, shaft design, and safety by providing agreed definitions for industry-specific components and processes.

Key Topics

• Comprehensive Terminology: Defines terms central to mine shaft structures, such as “bank level,” “conveyance,” “bridle,” “guide,” “shaft wall,” “stage,” and “winder.”
• International Variations: Includes alternative regional terms and credits international differences in mining language, strengthening global applicability.
• Preferred Usage: Highlights preferred terms in bold to promote consistency within documentation, designs, and operations.
• Relevant Scope: Focuses on terminology explicitly used in the ISO 19426 series, omitting common or generically used mining terms that have standard dictionary definitions.
• Component-Specific Definitions: Covers structural elements (e.g., transoms, bunton, bridle hangers), safety devices (e.g., emergency arresting structures, dogging systems), and operating principles (e.g., overwind, payload, winding rope).

Applications

• Design and Engineering: Supports mine designers, engineers, and manufacturers by clarifying standard terminology for mine shaft structures, facilitating accurate designs and technical specifications.
• Safety and Compliance: Assists safety inspectors, auditors, and operations managers in interpreting safety devices and procedures, ensuring regulatory compliance and improved operational safety.
• Cross-Border Projects: Enables multinational mining companies and joint ventures to communicate effectively and minimize misunderstandings stemming from differing regional terminology.
• Documentation and Reporting: Standardizes language used in technical documentation, project reports, training manuals, and risk assessments.
• Education and Training: Serves as a reference for mining professionals, educators, and new entrants to the sector, ensuring knowledge is transferred using recognized and correct industry terms.

Related Standards

Users of ISO/FDIS 19426-1 often reference other parts of the ISO 19426 series to address specialized aspects of mine shaft engineering:

• ISO 19426-2: Structures for Mine Shafts - Headframe Structures
  Covers terminology and requirements relating to headframe structures.
• ISO 19426-3: Structures for Mine Shafts - Sinking Stages
  Addresses vocabulary and standards for sinking stages used in shaft construction and deepening.
• ISO 19426-4: Structures for Mine Shafts - Conveyances
  Focuses on conveyance design and terminology, including personnel cars, skips, and cages.
• ISO 19426-5: Structures for Mine Shafts - Shaft System Structures
  Provides definitions and standards for wider shaft system components and configurations.

For authoritative details, always reference the latest ISO documentation available at www.iso.org.

---

Keywords: ISO 19426-1, mine shaft structures, mining vocabulary, ISO standards, shaft engineering, mining terminology, mine safety, international standardization, shaft components, mining industry documentation

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 82
Structures for mine shafts —
Secretariat: SA
Part 1:
Voting begins on:
2026-06-25
Vocabulary
Voting terminates on:
Structures de puits de mine —
2026-08-20
Partie 1: Vocabulaire
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 82
Structures for mine shafts —
Secretariat: SA
Part 1:
Voting begins on:
Vocabulary
Voting terminates on:
Structures de puits de mine —
Partie 1: Vocabulaire
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2026
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
Bibliography .13

iii
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 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)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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.
This second edition cancels and replaces the first edition (ISO 19426-1:2018), which has been technically
revised.
The main changes are as follows:
— Clarification in definitions and inclusion of terminology used in other countries.
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.

iv
Introduction
Many mining companies, and many of the engineering companies that 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.

v
FINAL DRAFT International Standard ISO/FDIS 19426-1:2026(en)
Structures for mine shafts —
Part 1:
Vocabulary
1 Scope
This document specifies the terms and definitions related to the structures for mine shafts, used throughout
ISO 19426 series.
Terms used in mining can vary from conventional engineering usage, and they vary quite considerably
between different countries. For this reason, alternative terms are provided in many of the entries. The
preferred terms, given in bold type, are those used throughout ISO 19426 series.
It is assumed that users of this document are familiar with mining, so common terms with normal dictionary
usage are not defined. Also, no definitions are provided for terms that can be widely used in mining but are
not explicitly used in ISO 19426 series.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
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 https:// www .electropedia .org/
3.1
bank level
top of the shaft
3.2
bank door
collar door
shaft door
door installed at bank level (3.1) that prevents personnel, equipment and material from falling down the
shaft
3.3
bottom transom
structural member, or group of members, located at the bottom of the bridle (3.7) and used to transfer
underslung loads (3.85) or tail-rope loads (3.8) to the bridle hangers
Note 1 to entry: See Figures 1, 2 and 3.
3.4
box front
gate
structure located at the lower end of a rock pass (3.62) used to control rock (3.61) flow

3.5
brattice screen
screen to partition off a portion of the shaft to prevent falling objects or spillage moving from one area of the
shaft to another
Note 1 to entry: This is usually placed around personnel hoisting compartments to ensure safe hoisting conditions.
3.6
brattice wall
airtight dividing wall partitioning a shaft into two distinct ventilation compartments, one being an upcast
compartment and the other a downcast compartment
3.7
bridle
bail
structural frame that includes the top transom (3.81), the bottom transom (3.3) and the bridle hangers (3.8)
to form a frame that carries the cage (3.11) or skip (3.73) body
Note 1 to entry: See Figures 1, 2 and 3.
3.8
bridle hanger
structural member, or group of members, that transfers loads between the top transom (3.81) and bottom
transom (3.3)
Note 1 to entry: See Figures 1, 2 and 3.
3.9
brow beam
beam that supports the concrete layer that stabilizes the hanging wall at a station
3.10
bunton
structural member (usually horizontal) that primarily provides support to the conveyance (3.15)guides
(3.37)
3.11
cage
single or multiple deck conveyance (3.15) used for the transportation of personnel, equipment or material
(or both) in the shaft
Note 1 to entry: See Figure 1.
3.12
camelback
raised portion of the path traversed by a roller, used for tipping hoppers in decline shafts (3.21) or for
providing a gravity locking mechanism on skips (3.73) in vertical shafts
3.13
canopy
cover or roof structure, offering protection to persons on the top deck of the stage (3.75) or on a conveyance
(3.15)
3.14
catch plate
spectacle plate
device for operating and supporting the rope-detaching hook in a final overwind (3.55) condition, and that
subsequently prevents the detached conveyance (3.15) from running back down the shaft

3.15
conveyance
container or structure used in a mine shaft to transport a load or perform a task, that includes counterweight
(3.17), equipping skeleton (3.31) cage, inspection platform, kibble (3.46), personnel or material cage, skip
(3.73), sinking cross-head, material cars, hoppers, or cradle
Note 1 to entry: Some typical conveyances are illustrated in Figures 1, 2 and 3.
a)  Front view b)  Side view
Key
1 top transom
2 roof beam
3 floor beam
4 bottom transom
5 bridle hanger
Figure 1 — Typical 3 deck cage components

a)  Front view b)  Side view
Key
1 top transom
2 pivot bar
3 bridle hanger
4 bottom transom
5 tipping roller
6 door
7 loading lip
Figure 2 — Typical skip components

a)  Front view b)  Side view
Key
1 top transom
2 roof beam
3 floor beam
4 bottom transom
5 bridle hanger
Figure 3 — Typical single deck cage components
3.16
control conveyance
pilot car
conveyance (3.15) in a decline shaft (3.21), attached to the haulage rope or the winding rope (3.88), that can
contain an operator who is in communication with the haulage engine or winder (3.87) and that controls the
operation of the train
3.17
counterweight
balance mass in a conveyance (3.15) winding system
3.18
crash beam
beam intended to stop the conveyance (3.15) in the event of a final overwind (3.55)
3.19
critical load bearing component
structural components, failure of which would be catastrophic
Note 1 to entry: For conveyances (3.15), this includes all top transoms (3.81) and bottom transoms (3.3), bridle hangers
(3.8), floor beams and their immediate connecting elements.
3.20
cross beam
beam spanning between the shaft walls (3.68) for the purposes of suspending a stage (3.75)

3.21
decline shaft
incline shaft
inclined excavation equipped with tracks where people, material or rock (3.60) are regularly transported by
means of a winder (3.87)
Note 1 to entry: The term incline shaft is used if the shaft was excavated from the lower end upwards.
3.22
distributor
kettle
reservoir supported on the stage (3.75), that contains the concrete before it is placed in the shaft formwork
3.23
dogging system
device mounted on a conveyance (3.15) and intended to stop the conveyance by engaging onto the guides
(3.37) in the
...

ISO/TC 82
Secretariat: SA
Date: 2026-05-05xx
Structures for mine shafts —
Part 1:
Vocabulary
Structures de puits de mine— —
Partie 1: Vocabulaire
FDIS stage
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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'sISO’s member body in the country of the requester.
ISO Copyright Officecopyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email:
E-mail: [e-mail]
Website: www.iso.org
Published in Switzerland.
ii
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
Bibliography . 14

iii
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 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).
Attention is drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse 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) patent(s) which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which may be
obtained from the patent database available at www.iso.org/patents. ISO . 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 ).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation onof 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.htmlthe following URL: .
This document was prepared by Technical Committee ISO/TC 82, Mining.
This second edition cancels and replaces the first edition (ISO 19426-1:2018), which has been technically
revised.
The main changes are as follows:
— Clarification in definitions and inclusion of terminology used in other countries.
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.
iv
Introduction
Many mining companies, and many of the engineering companies that 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.
v
Structures for mine shafts — —
Part 1:
Vocabulary
1 Scope
This document specifies the terms and definitions related to the structures for mine shafts, used throughout
ISO 19426 series.
Terms used in mining can vary from conventional engineering usage, and they vary quite considerably
between different countries. For this reason, alternative terms are provided in many of the entries. The
preferred terms, given in bold type, are those used throughout ISO 19426 series.
It is assumed that users of this document are familiar with mining, so common terms with normal dictionary
usage are not defined. Also, no definitions are provided for terms that can be widely used in mining but are
not explicitly used in ISO 19426 series.
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.
There are no normative references in this document.
3 Terms and definitions
ISO and IEC maintain terminologicalterminology databases for use in standardization at the following
addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia : available at https://www.electropedia.org/
3.1 3.1
bank level
top of the shaft
3.2 3.2
bank door
collar door
shaft door
door installed at bank level (3.1(3.1)) that prevents personnel, equipment and material from falling down the
shaft
3.3 3.3
bottom transom
structural member, or group of members, located at the bottom of the bridle (3.7(3.7)) and used to transfer
underslung loads (3.85(3.85)) or tail-rope loads (3.8(3.8)) to the bridle hangers
Note 1 to entry: See Figures 1Figures 1, 2, 2 and 33.
3.4 3.4
box front
gate
structure located at the lower end of a rock pass (3.62(3.62)) used to control rock (3.61(3.61)) flow
3.5 3.5
brattice screen
screen to partition off a portion of the shaft to prevent falling objects or spillage moving from one area of the
shaft to another
Note 1 to entry: This is usually placed around personnel hoisting compartments to ensure safe hoisting conditions.
3.6 3.6
brattice wall
airtight dividing wall partitioning a shaft into two distinct ventilation compartments, one being an upcast
compartment and the other a downcast compartment
3.7
Bridle
3.7
bridle
bail
structural frame that includes the top transom (3.81(3.81),), the bottom transom (3.3(3.3)) and the bridle
hangers (3.8(3.8)) to form a frame that carries the cage (3.11(3.11)) or skip (3.73(3.73)) body
Note 1 to entry: See Figures 1Figures 1, 2, 2 and 33.
3.73.8 3.8
bridle hanger
structural member, or group of members, that transfers loads between the top transom (3.81(3.81)) and
bottom transom (3.3(3.3))
Note 1 to entry: See Figures 1Figures 1, 2, 2 and 33.
3.83.9 3.9
brow beam
beam that supports the concrete layer that stabilizes the hanging wall at a station
3.93.10 3.10
bunton
structural member (usually horizontal) that primarily provides support to the conveyance (3.15(3.15)) guides
(3.37(3.37))
3.103.11 3.11
cage
single or multiple deck conveyance (3.15(3.15)) used for the transportation of personnel, equipment or
material (or both) in the shaft
Note 1 to entry: See Figure 1Figure 1.
3.113.12 3.12
camelback
raised portion of the path traversed by a roller, used for tipping hoppers in decline shafts (3.21(3.21)) or for
providing a gravity locking mechanism on skips (3.73(3.73)) in vertical shafts
3.123.13 3.13
canopy
cover or roof structure, offering protection to persons on the top deck of the stage (3.75(3.75)) or on a
conveyance (3.15(3.15))
3.133.14 3.14
catch plate
spectacle plate
device for operating and supporting the rope-detaching hook in a final overwind (3.55(3.55)) condition, and
that subsequently prevents the detached conveyance (3.15(3.15)) from running back down the shaft
3.143.15 3.15
conveyance
container or structure used in a mine shaft to transport a load or perform a task, that includes counterweight
(3.17(3.17),), equipping skeleton (3.31(3.31)) cage, inspection platform, kibble (3.46(3.46),), personnel or
material cage, skip (3.73(3.73),), sinking cross-head, material cars, hoppers, or cradle
Note 1 to entry: Some typical conveyances are illustrated in Figures 1Figures 1, 2, 2 and 33.
19426-1_ed2fig1a.EPS
19426-1_ed2fig1b.EPS
a)  Front view b)  Side view
Key
1 top transom (3.81)
2 roof beam
3 floor beam
4 bottom transom (3.3)
5 bridle hanger (3.8)
Figure 1 — Typical 3 deck cage components
19426-1_ed2fig2b.EPS
19426-1_ed2fig2a.EPS
a)  Front view b)  Side view
Key
1 top transom (3.81)
2 pivot bar
3 bridle hanger (3.8)
4 bottom transom (3.3)
5 tipping roller
6 door
7 loading lip
Figure 2 — Typical skip components
19426-1_ed2fig3a.EPS 19426-1_ed2fig3b.EPS

a)  Front view b)  Side view
Key
1 top transom (3.81)
2 roof beam
3 floor beam
4 bottom transom (3.3)
5 bridle hanger (3.8)
Figure 3 — Typical single deck cage components
3.153.16 3.16
control conveyance
pilot car
conveyance (3.15(3.15)) in a decline shaft (3.21(3.21),), attached to the haulage rope or the winding rope
(3.88(3.88),), that can contain an operator who is in communication with the haulage engine or winder
(3.87(3.87)) and that controls the operation of the train
3.163.17 3.17
counterweight
balance mass in a conveyance (3.15(3.15)) winding system
3.173.18 3.18
crash beam
beam intended to stop the conveyance (3.15(3.15)) in the event of a final overwind (3.55(3.55))
3.183.19 3.19
critical load bearing component
structural components, failure of which would be catastrophic
Note 1 to entry: For conveyances (3.15(3.15),), this includes all top transoms (3.81(3.81)) and bottom transoms
(3.3(3.3),), bridle hangers (3.8(3.8),), floor beams and their immediate connecting elements.
3.193.20 3.20
cross beam
beam spanning between the shaft walls (3.68(3.68)) for the purposes of suspending a stage (3.75(3.75))
3.203.21 3.21
decline shaft
incline shaft
inclined excavation equipped with tracks where people, material or rock (3.60(3.60)) are regularly
transported by means of a winder (3.87(3.87))
Note 1 to entry: The term incline shaft is used if the shaft was excavated from the lower end upwards.
3.213.22 3.22
distributor
kettle
reservoir supported on the stage (3.75(3.75),), that contains the concrete before it is placed in the shaft
formwork
3.223.23 3.23
dogging system
device mounted on a conveyance (3.15(3.15)) and intended to stop the conveyance by engaging onto the guides
(3.37(3.37)) in the event of loss of head rope (3.41(3.41)) tension
3.233.24 3.24
doubling-down
procedure where a rope is doubled by use of a sheave temporarily attached to the conveyance (3.15(3.15)) to
carry out any of the following:
a) a) installation and changing of winding ropes (3.88(3.88););
b) b) cutting of winding rope back ends;
c) c) lowering of abnormal loads; or
d) d) tightening of winding rope coils on the winder (3.87(3.87)) drum
3.243.25 3.25
Dropsets
3.24.13.25.1 3.25.1
emergency arresting dropset
dropbeam
hinged beam or beams installed in a decline shaft (3.21(3.21)) to arrest a runaway conveyance (3.15(3.15))
3.24.23.25.2 3.25.2
station dropset
pair of hinged beams and tracks that is used to divert a conveyance (3.15(3.15)) from its inclined plane of
travel to a horizontal plane at a station
3.253.26 3.26
drop test
test performed by dropping a conveyance (3.15(3.15)) to confirm the adequate performance of the dogging
system (3.23(3.23))
---------------------- Page
...