prEN ISO 20770-6

Drilling and foundation equipment - Safety - Part 6: Interchangeable auxiliary equipment (ISO/DIS 20770-6:2025)

See attached draft

Geräte für Bohr- und Gründungsarbeiten - Sicherheit - Teil 6: Auswechselbare Zusatzausrüstungen (ISO/DIS 20770-6:2025)

Dieses Dokument behandelt zusammen mit ISO 20770 1:— alle wesentlichen Gefährdungen für auswechselbare Zusatzausrüstungen, wenn sie bestimmungsgemäß und unter den Bedingungen der Fehlanwendung, die vernünftigerweise vom Hersteller vorhersehbar sind und mit der gesamten Lebensdauer der Maschine in Verbindung stehen, verwendet werden (siehe Anhang B).
Die Anforderungen in diesem Teil gelten zusätzlich zu den in ISO 20770 1:— gestellten gemeinsamen Anforderungen.
Das vorliegende Dokument wiederholt nicht die Anforderungen von ISO 20770 1:—, sondern ergänzt oder ersetzt die Anforderungen für die Anwendung von auswechselbaren Zusatzausrüstungen.
Dieses Dokument legt die besonderen Sicherheitsanforderungen für auswechselbare Zusatzausrüstungen fest, die bei Bohr- und Gründungsarbeiten im Zusammenhang mit Geräten für Bohr- und Gründungsarbeiten, landwirtschaftlichen Geräten und/oder Erdbaumaschinen zu verwenden sind, wenn sie bestimmungsgemäß und unter den Bedingungen der Fehlanwendung, die vernünftigerweise vom Hersteller vorhersehbar sind, verwendet werden.
Auswechselbare Zusatzausrüstungen umfassen Ramm- und Zieheinrichtungen, Schlaghämmer, Ziehhämmer, Rüttler, Tiefenrüttler, statische Ramm-/Zieheinrichtungen, Drehschlagbohrköpfe, Drehbohrantriebe, Mäklerausstattung wie Mäkler, die mit Bohrgestänge und Getriebe ausgerüstet und am Ausleger eines Baggers angebracht sind, sowie oszillierende/durchdrehende Verrohrungsmaschinen.
Schlitzwandschneidwerkzeuge werden in ISO 20770 4:— behandelt.

Machines de forage et de fondation - Sécurité - Partie 6: Équipements complémentaires interchangeables (ISO/DIS 20770-6:2025)

Oprema za vrtanje in temeljenje - Varnost - 6. del: Zamenljiva pomožna oprema (ISO/DIS 20770-6:2025)

General Information

• Status: Not Published
• Publication Date: 13-Sep-2026
• ICS: 53.100 - Earth-moving machinery
• Technical Committee: CEN/TC 151 - Construction equipment and building material machines - Safety
• Drafting Committee: CEN/TC 151/WG 3 - Drilling equipment - Safety
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 08-May-2025
• Due Date: 15-Feb-2025
• Completion Date: 08-May-2025
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 2023/1230 - Regulation (EU) 2023/1230 of the European Parliament and of the Council of 14 June 2023 on machinery and repealing Directive 2006/42/EC of the European Parliament and of the Council and Council Directive 73/361/EEC (Text with EEA relevance)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Mandate: M/605 - COMMISSION IMPLEMENTING DECISION of 20.1.2025 on a standardisation request to the European Committee for Standardization and to the European Committee for Electrotechnical Standardization as regards machinery and related products in support of Regulation (EU) 2023/1230 of the European Parliament and of the Council
• Ref Project: oSIST prEN ISO 20770-6:2025 - Drilling and foundation equipment - Safety - Part 6: Interchangeable auxiliary equipment (ISO/DIS 20770-6:2025)

Relations

• Revises: EN 16228-7:2014+A1:2021 - Drilling and foundation equipment - Safety - Part 7: Interchangeable auxiliary equipment
• Effective Date: 04-Oct-2023

Overview

The draft international standard prEN ISO 20770-6:2025 focuses on the safety of interchangeable auxiliary equipment used in drilling and foundation machinery. This standard is part of the ISO 20770 series, which addresses safety requirements specifically for drilling and foundation equipment. Part 6 complements the general safety requirements established in ISO 20770-1 by detailing the safety measures and risk reduction practices associated with a range of auxiliary equipment that is connected to main drilling and foundation machines.

Applicable to equipment such as impact hammers, vibrators, rotary drilling drives, and pile installation/extraction tools, this standard is essential for manufacturers, operators, and safety professionals involved in earthworks, foundation construction, and geotechnical engineering. It ensures that all significant hazards- including those arising from foreseeable misuse-are adequately controlled.

Key Topics

• Scope and Applicability
  Covers safety requirements aimed specifically at auxiliary equipment attached to drilling and foundation machinery, agricultural machines, or earth-moving equipment. The standard addresses the entire lifecycle and reasonably foreseeable uses and misuses.

• Safety Requirements and Risk Controls
  Details general and equipment-specific protective measures, including:

  • Impact hammers
  • Casing oscillators and rotators
  • Vibrators and deep vibrators
  • Clamping devices for pile element connections
  • Excavator mounted auger drives

• Noise Control
  Specifies noise emission limits and measurement methods per relevant acoustic standards (e.g., ISO 3744, ISO 11201), critical for operator safety and regulatory compliance.

• Verification Procedures
  Methods for verifying compliance with safety requirements to ensure effective risk reduction.

• Information and Marking
  Guidance on proper marking, labeling, and user instruction manuals tailored to each type of interchangeable auxiliary equipment to promote safe handling and operation.

• Complementary Relationship to ISO 20770-1
  This part supplements and may override provisions in the general safety requirements standard ISO 20770-1 to cover the unique risks posed by auxiliary equipment.

Applications

• Construction and Foundation Works
  Enhances operational safety in pile driving, drilling, and foundation installation projects, ensuring that auxiliary equipment does not introduce new hazards.

• Earth-moving Machinery Integration
  Provides standards for auxiliary tools used in conjunction with excavators and other earth-moving equipment, such as add-on auger drives and drill leaders.

• Geotechnical and Civil Engineering
  Supports compliance with occupational health and safety regulations and industry best practices by addressing hazards specific to drilling auxiliary tools.

• Manufacturing and Maintenance
  Assists equipment manufacturers in designing safe auxiliary components and provides maintenance personnel with guidelines to reduce occupational risks.

Related Standards

This standard is part of the broader ISO 20770 series and refers extensively to the following:

• ISO 20770-1: General Safety Requirements
• ISO 20770-2: Mobile Drill Rigs for Civil and Geotechnical Engineering
• ISO 20770-3: Foundation Equipment Safety
• ISO 20770-4: Diaphragm Walling Equipment
• ISO 20770-5: Jetting, Grouting and Injection Equipment
• ISO 12100: Safety of Machinery - Risk Assessment and Risk Reduction Principles
• ISO 3744, ISO 11201, ISO 11203: Acoustics and Noise Emission Measurement Standards
• ISO 11886: Drilling and Foundation Machinery Specifications

These interconnected standards ensure comprehensive safety controls across drilling and foundation operations, promoting harmonized risk management on construction sites.

---

Keywords: drilling equipment safety, foundation machinery, interchangeable auxiliary equipment, ISO 20770-6, impact hammers, vibrators, rotating drives, pile installation safety, noise control in drilling, earth-moving machinery safety, geotechnical engineering standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2025
Oprema za vrtanje in temeljenje - Varnost - 6. del: Zamenljiva pomožna oprema
(ISO/DIS 20770-6:2025)
Drilling and foundation equipment - Safety - Part 6: Interchangeable auxiliary equipment
(ISO/DIS 20770-6:2025)
Geräte für Bohr- und Gründungsarbeiten - Sicherheit - Teil 7: Auswechselbare
Zusatzausrüstungen (ISO/DIS 20770-6:2025)
Machines de forage et de fondation - Sécurité - Partie 6: Équipements complémentaires
interchangeables (ISO/DIS 20770-6:2025)
Ta slovenski standard je istoveten z: prEN ISO 20770-6
ICS:
53.100 Stroji za zemeljska dela Earth-moving machinery
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 20770-6
ISO/TC 195/SC 3
Drilling and foundation
Secretariat: AFNOR
equipment — Safety —
Voting begins on:
Part 6: 2025-02-13
Interchangeable auxiliary
Voting terminates on:
2025-05-08
equipment
Machines de forage et de fondation — Sécurité —
Partie 6: Équipements complémentaires interchangeables
ICS: 53.100
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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 SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 20770-6:2025(en)
DRAFT
ISO/DIS 20770-6:2025(en)
International
Standard
ISO/DIS 20770-6
ISO/TC 195/SC 3
Drilling and foundation
Secretariat: AFNOR
equipment — Safety —
Voting begins on:
Part 6:
Interchangeable auxiliary
Voting terminates on:
equipment
Machines de forage et de fondation — Sécurité —
Partie 6: Équipements complémentaires interchangeables
ICS: 53.100
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 20770-6:2025(en)
ii
ISO/DIS 20770-6:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Safety requirements and/or protective/risk reduction measures . 3
4.1 General .3
4.2 Additional protective measures for interchangeable auxiliary equipment .3
4.2.1 Impact hammers .3
4.2.2 Casing oscillators/rotators .3
4.2.3 Vibrators .4
4.2.4 Clamping devices for connection of pile elements to the driving tool.4
4.2.5 Excavator mounted add-on auger drives .5
4.3 Noise .5
5 Verification of the safety requirements and/or protective/risk reduction measures . 5
6 Information for use . 6
6.1 Marking of interchangeable auxiliary equipment .6
6.1.1 General .6
6.1.2 Down the hole hammers .6
6.1.3 Impact hammers .7
6.1.4 Static pile pushing/pulling device .7
6.1.5 Casing oscillators/rotators .7
6.1.6 Rotary drilling drives .7
6.1.7 Deep vibrators .7
6.1.8 Vibrators .7
6.2 Instruction books for interchangeable auxiliary equipment .7
6.2.1 General .7
6.2.2 Down the hole hammers .8
6.2.3 Impact hammers .8
6.2.4 Static pile pushing/pulling device .8
6.2.5 Casing oscillators/rotators .8
6.2.6 Vibrators .8
6.2.7 Excavator mounted add-on auger drives .9
Annex A (normative) Noise test code for interchangeable auxiliary equipment .10
Annex B (informative) List of additional significant hazards .15
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive2006/42/EC aimed to be covered . 17
Annex ZB (informative) Relationship between this European Standard and the essential
requirements of Regulation EU 2023/1230 aimed to be covered .20
Bibliography .24

iii
ISO/DIS 20770-6:2025(en)
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).
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 195, Building construction machinery and
equipment, Subcommittee SC 3, Drilling and foundation machinery and equipment.
A list of all parts in the ISO 20770 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
ISO/DIS 20770-6:2025(en)
Introduction
This document is a type C standard as stated in ISO 12100:2010.
The machinery concerned and the extent to which hazards are covered are indicated in the scope of this
standard.
When requirements of this type C standard are different from those which are stated in type A or B standards,
the requirements of this type C standard take precedence over the requirements of the other standards, for
drilling and foundation equipment that have been designed and built according to the requirements of this
type C standard.
v
DRAFT International Standard ISO/DIS 20770-6:2025(en)
Drilling and foundation equipment — Safety —
Part 6:
Interchangeable auxiliary equipment
1 Scope
This document together with ISO 20770-1:____, deals with all significant hazards for interchangeable
auxiliary equipment when they are used as intended and under the conditions of misuse which are reasonably
foreseeable by the manufacturer associated with the whole life time of the machine (see Annex B).
The requirements of this part are complementary to the common requirements formulated in
ISO 20770-1:____.
This document does not repeat the requirements from ISO 20770-1:____, but adds or replaces the
requirements for application for interchangeable auxiliary equipment.
This document specifies the specific safety requirements for interchangeable auxiliary equipment to be
used in drilling and foundation operations, connected with drilling and foundation equipment, agricultural
equipment and/or earth moving machinery when they are used as intended and under the conditions of
misuse which are reasonably foreseeable by the manufacturer.
Interchangeable auxiliary equipment includes pile installation and extraction equipment, impact hammers,
extractors, vibrators, deep vibrators, static pile pushing/pulling devices, rotary percussion heads, rotary
drilling drives, drill leader equipment such as leaders equipped with a drill stem and gears attached to the
boom of an excavator and casing oscillators/rotators.
Diaphragm wall cutting tools are dealt with in ISO 20770-4:____.
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.
1)
ISO 20770-1, ____ , Drilling and foundation equipment — Safety — Part 1: General requirements
2)
ISO 20770-2, ____ , Drilling and foundation equipment — Safety — Part 2: Mobile drill rigs for civil and
geotechnical engineering in soil or soil and rock mixture
3)
ISO 20770-3, ____ , Drilling and foundation equipment — Safety — Part 3: Foundation equipment
4)
ISO 20770-4, ____ , Drilling and foundation equipment — Safety — Part 4: Diaphragm walling equipment
5)
ISO 20770-5, ____ , Drilling and foundation equipment — Safety — Part 5: Jetting, grouting and injection
equipment
1) Currently at stage DIS
2) Currently at stage DIS
3) Currently at stage DIS
4) Currently at stage DIS
5) Currently at stage DIS
ISO/DIS 20770-6:2025(en)
ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 11201:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound
pressure levels at a work station and at other specified positions in an essentially free field over a reflecting
plane with negligible environmental corrections
ISO 11203:1995, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound
pressure levels at a work station and at other specified positions from the sound power level
ISO 11203:1995/Amd 1:2020, Acoustics — Noise emitted by machinery and equipment — Determination of
emission sound pressure levels at a work station and at other specified positions from the sound power level —
Amendment 1
6)
ISO 11886, ____ , , Drilling and foundation machinery — Soil or soil and rock mixture drilling and foundation
machines — Commercial specifications
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100:2010, ISO 20770-1:___,
ISO 11886:____ and the following 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 https:// www .electropedia .org/
NOTE Examples are given in ISO 11886:____.
3.1
down the hole hammer
DTH-hammer
device in which the percussion mechanism is located directly behind the drill bit
Note 1 to entry: The drill pipes transmit the necessary feed force and rotation to hammer and bit plus compressed air
or fluids for the hammer and flushing of cuttings. The drill pipes are added to the drill string successively behind the
hammer as the hole gets deeper. The hammer piston strikes the impact surface of the bit directly, while the hammer
casing gives straight and stable guidance of the drill bit. This means that the impact energy does not have to pass
through any joints at all. The impact energy therefore is not lost in joints allowing for much deeper percussion drilling.
Note 2 to entry: ISO 11886:____, C.29 provides a detailled description of down the hole hammers.
3.2
sonic drilling device
equipment which superposes rotary drilling with vibrations at a high frequency
Note 1 to entry: The vibrations are mostly generated within the drill head and can be controlled by the operator to
suit the specific conditions of the soil/rock geology. Resonance magnifies the amplitude of the drill bit, which fluidizes
the soil particles at the bit face, generating a fast and easy penetration through most geological formations. The
frequencies used with this method are normally between 50 Hz and 120 Hz. This equipment can be connected at the
leader of a drilling and foundation equipment.
6) At the stage of preparation : ISO/DIS 11886:2023

ISO/DIS 20770-6:2025(en)
3.3
casing oscillator/rotator
equipment to drive in or push out casings with great diameters by low-speed rotation and high push/pull force
Note 1 to entry: This equipment can be connected to the undercarriage of the drilling and foundation equipment. Some
types of casing oscillator/rotator can be used as standalone equipment, controlled from the operator’s position of the
drilling and foundation equipment, or by an extra operator at the casing oscillator/rotator. In case of combination with
the undercarriage, the drilling and foundation equipment has to be able to resist the reaction forces coming from the
torque and the pushing/pulling forces of the casing oscillator/rotator. The movement of the clamp system holding
the casing can be intermittent, changing the moving direction after each movement interval or can be a more or less
turning movement in one direction.
Note 2 to entry: ISO 11886:____, C.42 and C.43 provide a detailled description of casing oscillator and casing rotator.
3.4
rotary drilling drive
equipment to actuate the rotating drilling stem, which is normally mounted at a leader
Note 1 to entry: Rotary drilling drives are rotating the drill stem continuously in one direction.
3.5
vibrator
equipment to install or extract piling elements by high-frequency oscillation into or out of the ground
Note 1 to entry: The force is generated by vibrations, which have a usual range between 20 Hz and 50 Hz. These
vibrations will soften the ground; the weight or pull down or pulling force will move the elements. The vibrations
are generated by unbalanced weights, which are driven by hydraulic or electric power. Vibrators can be mounted at
the leader of a piling rig or can be free riding at top of the element, suspended by a rope or connected to a cardan/
universal joint to the carrier machine.
4 Safety requirements and/or protective/risk reduction measures
4.1 General
The final combination of interchangeable auxiliary equipment with drilling and foundation equipment
and/or earth-moving machinery shall fulfil the requirements of ISO 20770-1:____, ISO 20770-2:____,
ISO 20770-3:____ , ISO 20770-4:____ and ISO 20770-5:____, where applicable.
Interchangeable auxiliary equipment of drilling and foundation equipment shall comply with the
requirements of ISO 20770-1:____, except as modified or replaced by the requirements of this part. In
addition, interchangeable auxiliary equipment having no mobility nor lifting function, the corresponding
clauses of ISO 20770-1:____ do not apply, e.g. 4.7, 4.10.2, 4.16.3, 4.2.3.6.6, 4.2.3.6.7.
[1]
NOTE ISO 23224:____ deals with horizontal directional drilling (HDD) machines which would be combination of
interchangeable auxiliary equipment and drilling and foundation equipment and/or earth-moving machinery.
4.2 Additional protective measures for interchangeable auxiliary equipment
4.2.1 Impact hammers
A device to control and limit the striking energy of impact type hammers/extractors shall be installed.
The exhaust channel for diesel hammers shall lead to upwards opening.
4.2.2 Casing oscillators/rotators
The controls (including emergency stop) shall stay at the operator’s position, or if there is a separate control
station, there shall be an additional emergency stop at the operator’s position.

ISO/DIS 20770-6:2025(en)
4.2.3 Vibrators
Suspension devices of vibrators shall isolate the transmission of vibrations to the carrier machine.
The maximum allowable pulling force shall be clearly marked on the vibrator.
In case of failure or breakage of the spring elements, a connection between vibrator and suspension device
shall remain in order to prevent broken parts falling down.
4.2.4 Clamping devices for connection of pile elements to the driving tool
The clamping force of the clamping device for vibrators shall be in any operating condition at least 1,2 times
the actual vertical force.
This condition is deemed to be met when the clamping force is at least 1,2 times the theoretical maximum
centrifugal force under no load.
The clamping force of the clamping device for the hydraulic pile press-in and extraction machine shall be in
any operating condition at least 2 times the maximum pulling force.
a) Clamping when pressing-in b) Clamping when extracting
Key
1 maximum reaction force
2 clamping force
3 maximum pressing force (a)/ maximum extracting force (b)
Figure 1 — Clamping device for the hydraulic pile press-in and extraction machine
The pressure developed in the hydraulic system shall provide at least the required minimum clamping force,
and a device shall be included in the system for maintaining automatically the hydraulic pressure at the
minimum required value as long as the clamp is closed.
All clamp systems shall have a protective device which prevents clamps from being unintentionally opened
during operation.
Clamps shall have a safety device (e.g. check valve) maintaining them in the closed position even in case of
total loss of pressure in the hydraulic lines.
The pressure in the clamp hydraulic cylinder shall be indicated on a pressure gauge or display device.
Alternatively, an indicating device shall indicate whether the pressure in the clamping hydraulic cylinder is
maintained within the required pressure level.

ISO/DIS 20770-6:2025(en)
Clamping devices shall be made such that they facilitate the pitching of the pile into the gap of the clamping
device, e.g. by guiding plates or chamfers at the open end of the gap.
Interchangeable equipment equipped with a clamping device for driving sheet piles or piles shall be fitted
with an anchoring point to which a device (e.g. rope or chain) can be attached to secure the sheet piles or
piles. This does not apply to cast in situ system.
4.2.5 Excavator mounted add-on auger drives
Add-on auger drives mounted on the boom of an excavator are excluded from the requirement of guarding
the auger. ISO 20770-1:____, 4.23.2 does not apply.
4.3 Noise
ISO 20770-1:____, 4.27.2 applies with the addition of specific test code specified in Annex A.
5 Verification of the safety requirements and/or protective/risk reduction measures
Safety requirements and/or protective/risk reduction measures of Clauses 4 and 6 of this document shall be
verified according to Table 2 below. It includes the following types of verification:
a) design check: the result of which being to establish that the design documents comply with the
requirements of this document;
b) calculation: the results of which being to establish that the requirements of this document have been met;
c) visual verification: the result of which only being to establish that something is present (e.g. a guard, a
marking, a document);
d) measurement: the result of which shows that the required numerical values have been met (e.g. geometric
dimensions, safety distances, resistance of insulation of the electric circuits, noise, vibrations);
e) functional tests: the result of which shows that the adequate signals intended to be forwarded to the
main control system of the complete machine are available and comply with the requirements and with
the technical documentation;
f) special verification: the procedure being given or in the referred clause.
Table 1 — Verification of safety requirements and/or protective measures
4 Safety requirements and/or protective/risk reduction measures
4.1 General x 1
4.2 Additional protective measures for interchangeable auxiliary equipment
4.2.1 Impact hammers x x
4.2.2 Casing oscillators/rotators x x
4.2.3 Vibrators x x x
4.2.4 Clamping devices for connection of pile elements to the driving tool x x x
1 Verification by reference to standard which is mentioned in the corresponding clause.

Clause
Title
a)  Design chck
b)  Calculation
c) Visual verification
d)  Measurement
e)  Functional test
f) Special verification
(See at the end of this
table)
ISO/DIS 20770-6:2025(en)
TTabablele 1 1 ((ccoonnttiinnueuedd))
4.2.5 Excavator mounted add-on auger drives x
4.3 Noise x
6 Information for use
6.1 Marking of interchangeable auxiliary equipment x x 1
6.1.1 General
6.1.2 Down the hole hammers x
6.1.3 Impact hammers x
6.1.4 Static pile pushing/pulling device x
6.1.5 Casing oscillators/rotators x
6.1.6 Rotary drilling drives x
6.1.7 Deep vibrators x
6.1.8 Vibrators x
6.2 Instruction books for interchangeable auxiliary equipment
6.2.1 General x 1
6.2.2 Down the hole hammers x x 1
6.2.3 Impact hammers x 1
6.2.4 Static pile pushing/pulling device x x 1
6.2.5 Casing oscillators/rotators x x 1
6.2.6 Vibrators x 1
6.2.7 Excavator mounted add-on auger drives x
1 Verification by reference to standard which is mentioned in the corresponding clause.
6 Information for use
6.1 Marking of interchangeable auxiliary equipment
6.1.1 General
ISO 20770-1:____, 6.1 applies with following additions.
Data plates shall be provided for all interchangeable auxiliary equipment, except down the hole hammers.
Hydraulic and pneumatic interchangeable auxiliary equipment shall be marked with the maximum allowable
pressure, where applicable.
6.1.2 Down the hole hammers
Down the hole hammers shall be marked by engraving.

Clause
Title
a)  Design chck
b)  Calculation
c) Visual verification
d)  Measurement
e)  Functional test
f) Special verification
(See at the end of this
table)
ISO/DIS 20770-6:2025(en)
6.1.3 Impact hammers
— maximum impact energy per impact;
— maximum drop height for free-fall hammers.
6.1.4 Static pile pushing/pulling device
— maximum clamp pressure;
— maximum pushing/pulling force on suspension system.
6.1.5 Casing oscillators/rotators
— maximum pressures;
— m
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