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Use advanced rigging in arboriculture tree work
Level
4
Credits
10
Purpose
This unit standard is for experienced and skilled arborists. People credited
with this unit standard are able to: evaluate loads and a rigging system for
arboriculture in accordance with workplace procedures; select rigging system
equipment and prepare for use under load; tie, dress and use knots for
sectional rigging; use rigging systems to snatch timber sections; and install
speed line systems and use them to lower sections of timber.
Subfield
Horticulture
Domain
Arboriculture
Status
Registered
Status date
11 December 2009
Date version published
11 December 2009
Planned review date
31 December 2014
Entry information
Prerequisite: Unit 25406, Undertake sectional felling in
arboriculture tree work, or demonstrate equivalent
knowledge and skills.
Accreditation
Evaluation of documentation and visit by NZQA, industry
and teaching professional in the same field from another
provider.
Standard setting body (SSB)
Primary Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0032
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Relevant reference material
The Codes of Practice are: Approved Code of Practice for Safety and Health in Tree
Work – Part 1 – Arboriculture (1994);
Approved Code of Practice for Safety and Health in Tree Work – Part 2 –
Maintenance of Trees Around Power Lines (1996);
Approved Code of Practice for Power-Operated Elevated Work Platforms (1995);
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Guide for Safety with Underground Services (2002); and their subsequent
amendments, they are available from regional offices of the Department of Labour,
Occupational Safety and Health Service, or the website http://www.dol.govt.nz.
The Standards are: BS 3998:1989 Recommendations for tree work; available from
http://www.standardsuk.com;
ANSI Z133.1-2006 Safety Requirements;
ANSI A300 Standards for Tree Care Operations (Parts 1 – 7) and their subsequent
amendments, available from the website: http://www.isa-arbor.com.
2
Legislation relevant to this unit standard includes – Health and Safety in Employment
Act 1992, Health and Safety in Employment Regulations 1995; and their subsequent
amendments.
3
Definitions
Workplace procedures refer to oral or written instructions to staff on procedures for
the worksite and equipment.
Rigging refers to systems used for felling or limb removal.
Elements and performance criteria
Element 1
Evaluate loads and a rigging system for arboriculture in accordance with workplace
procedures.
Performance criteria
1.1
The masses of given timber sections are calculated in accordance with
workplace procedures.
1.2
The load of a known mass of timber falling a known distance is calculated in
accordance with workplace procedures.
1.3
The forces on each component of the rigging system are calculated when under
load in accordance with workplace procedures.
Element 2
Select rigging system equipment for arboriculture and prepare for use under load.
Performance criteria
2.1
Suitable equipment and techniques are identified and selected for an
arboriculture rigging system in accordance with workplace procedures.
Range
equipment and techniques may include but are not limited to –
frictional devices, lowering and raising brakes, false crotches,
lowering ropes, pulling ropes, speed line ropes, whoopie slings,
rigging blocks, pulleys.
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2.2
Hazards involved in the work and the site are identified and managed in
accordance with workplace procedures.
2.3
Knowledge of the safe working load and breaking strain of the equipment
selected is demonstrated, and the weakest component of the system is
determined.
2.4
Communication systems are established with the groundsperson in accordance
with workplace procedures.
Range
2.5
may include but is not limited to – radio communications, hand
signals, verbal communications.
Ground staff are briefed on the removal procedure in accordance with
workplace procedures.
Range
method and sequence of work, individual responsibilities.
Element 3
Tie, dress and use knots for sectional rigging.
Range
running bowline, cow hitch, clove hitch, timber hitch, and one of alpine butterfly
or bowline on a bight.
Performance criteria
3.1
Knowledge of knots used for sectional rigging is demonstrated in accordance
with workplace procedures.
3.2
The appropriate knot for each component of the rigging system is selected in
accordance with workplace procedures.
Range
mid line knot, anchor attachment, timber being lowered, tensioning
knot.
3.3
Knots are tied and dressed in accordance with standards and workplace
procedures.
3.4
Knots are used in sectional rigging situations in accordance with workplace
procedures.
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Element 4
Use rigging systems to lower timber sections.
Range
from above 10 metres, sections exceeding 50kg in weight, from a clear bole and
branches.
Performance criteria
4.1
Timber sections for removal are identified and attached to rigging system in
accordance with workplace procedures.
4.2
A safe working position is adopted in accordance with standards and workplace
procedures.
Range
4.3
Timber sections are removed in a safe and controlled manner, in accordance
with the Codes of Practice and workplace procedures.
Range
4.4
anchor points, double tie in, work position stable and safe.
vertical and horizontal timber sections.
Timber sections are lowered under climber’s directions in accordance with
workplace procedures.
Element 5
Install speed line systems and use them to lower sections of timber.
Performance criteria
5.1
Anchor points are selected and a speed line is established in accordance with
standards and workplace procedures.
5.2
Techniques for attaching timber to the speed line in accordance with workplace
procedures are described.
Range
tip rope, butt rope, cradle.
5.3
Speed line attachment techniques are selected in accordance with maximum
timber sizes and speed line configuration.
5.4
Timber is lowered down the speed line in a controlled manner in accordance
with workplace procedures.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
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Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the Primary Industry Training Organisation http://www.primaryito.ac.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016