Purpose
CLIENT NAME AND LOGO HERE
Method Statement forConstruction of Gabion Protection CONTRACTOR
NAME AND LOGO HERE
Company Project No.Project No.Doc. Class1Distribution Code1
Company Doc. NoDoc. No.Rev. APage APPENDIX 2
CLIENT NAME HERE *
PROJECT NAME HERE *
COMPANY CONTRACT NO CONTRACTOR PROJECT NO -
Method Statement for Construction of Gabion Protection
A
Issued for Approval
RevIssue DateIssue StatusPrepared by
Reviewed by
Approved by
CLIENT NAME AND LOGO HERE
Method Statement forConstruction of Gabion Protection CONTRACTOR
NAME AND LOGO HERE
PROJECT NAME HERE Project No.Project No.Doc. Class1Distribution
Code1
Company Doc. NoDoc. No.Rev.APage 1 of 15
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Document Revision HistoryRevisionDescriptionDateCRS (if
applicable)
Ref. No.Rev
TABLE OF CONTENTS
1.0Introduction42.0Purpose and Scope43.0Document
Control44.0Reference Documents45.0Definitions, Terms and
Abbreviations76.0Responsibility77.0Materials and
Equipment88.0Resources89.0Methodology / Procedure910.0Work
Permit1111.0Quality Control1112.0Quality Assurance1113.0Health,
Safety and Environment11
APPENDICESAppendix 1HSE Risk AssessmentAppendix 2Instructions
for the Assembly, Installation and Filling of Gabions
IntroductionThe project represents the * SPECIFY.will supply and
install gabions along the top of cut slopes to divert and filter
upland runoff where indicated on the drawings. These will be
installed ahead of major earthwork operations to minimize potential
for washout of cut slopes both during the construction phase and
permanently thereafter. Such work will be in accordance with
associated details from the design and drawings, and in accordance
with project specifications.
Purpose and ScopeThis Method Statement describes the techniques
and methods to be implemented and the resources to be utilized for
the construction of Gabion Protection.Earthworks required for the
construction of temporary access roads and/ or other site
facilities are dealt with in separate cover.
Document ControlThe document governing the preparation,
registration, approval, distribution and amendment / revision of
this method statement will be according to requirement specified in
(*SPECIFY)The requirements for document numbering are addressed in
the project specific procedure (*SPECIFY)
This Method Statement is a controlled document, and will be
distributed as such to those detailed on the Internal Distribution
of Documents Matrix, maintained by the Document Controller, while
external distribution will be via the Secretary.
Reference DocumentsThe following documents define the
requirements to be employed to demonstrate compliance of the works
defined in this method Statement: DrawingsRef. Title
DocumentsRef.Title
Definitions, Terms and AbbreviationsDefinition and Terms
Abbreviations LCD Local Chart datum (0.00m)ResponsibilityThe
Project Manager is responsible for appoint site supervisory
personnel to organize, coordinate, and oversee the execution of the
work detailed in this Method Statement.The Construction Manager is
responsible for the organization and coordination of the entire
work detailed in this Method Statement.The responsible Engineer is
responsible for the execution of the works detailed in this Method
Statement. He will be responsible for instructing the Foremen /
Superintendent about the requirements of the contract, including
all restrictions, safety regulations, scope of work and time
schedule. In addition, he will be responsible for related logistic
matters and all matters related to HSE and the quality of the
works.The Superintendent/Foreman is responsible for the day-to-day
implementation and supervision of the works detailed in this method
statement.Assigned HSE staff is responsible to assist the
construction team to develop safe methods of working and to monitor
implementation of the controls as required.
Materials and EquipmentMaterialsThe materials for fabrication
and filling of the Gabions will be according to the Technical
(*SPECIFY)
Other materialsMaterials such as safety barricades, signaling
etc. around the excavated areas, will be provided during the works,
as per safety regulations.
EquipmentAll equipment to be deployed for the construction of
the gabions (transportation of materials, assembly, filling etc)
will be in good working condition and well maintained throughout
the duration of the works.
ResourcesEquipment: Main EquipmentNo.
as needed
as needed
Auxiliary EquipmentNo.
Personnel / Workforce:DescriptionNo.
Methodology / ProcedureAll the activities will take place in a
manner that will suit the natural ground conditions and will allow
maximum deployment of equipment. Auxiliary works such as temporary
access roads, maneuvering plateaus, assembly and stockpile areas
etc will be also constructed and maintained in order to ensure
easy, safe, unobstructed and well supervised execution of the
works.The dimensions of Gabions and Gabion Wall will be defined by
the design.
General.Gabions can be filled either directly in their final
position or at a suitable position and then transported to their
final position.
Foundation and stockpile area preparation.Prior to commencement
of dumping the filling material at a certain location, removal of
obstacles will take place.The surveyor will give the line in which
the gabion wall will be constructed.The foundation on which the
gabions will be placed will be cut or filled and graded to the
lines and grades of the design and drawings. Surface
irregularities, loose material, vegetation, and all foreign matter
will be removed from foundation surface area. When fill is
required, it will consist of materials conforming to the specified
requirements. Any unsuitable areas of the foundation will be
excavated and replaced with the specified material.Gabions will not
be placed in their final position until the foundation preparation
is completed and the surfaces have been inspected by the engineer
or the engineers representative.
Assembly, Installation and Filling of GabionsFor Assembly,
Installation and Filling of Gabions see Appendix 2.
InspectionPrior to assembly works, it will be ensured that the
correct materials as specified are delivered to site. Gabions that
have been damaged during transportation or during storage on site
will be repaired or disposed.The foundation of the gabion structure
will be inspected to be at the correct grades and levels as
required by design.A visual inspection of the gabions will be made
to ensure the correct fixing of the gabions sides and during their
installation the correct fixing between the adjacent cells. All
joints must be tight and correctly formed.At each stage of filling,
a visual inspection of the gabions will be made to ensure that no
large voids are present.Inspection will also take place in order to
check that the overall line and level of the gabion wall is
acceptable.Periodic inspection and inspection after severe weather
of flood occurrences will be carried out to ensure the performance
of the structure and that no external damage has occurred to the
mesh fabric which would affect the integrity of the structure.
Work Permit Necessary work permits for construction activities
will be obtained prior to commencement of the work.
Quality Control All works will be undertaken in compliance with
the quality requirements of the (*SPECIFY) All Gabions will be
visually inspected and their position will be checked by
surveyors.
Quality Assurance
Measurement Accuracy Instrument CalibrationMeasuring devices
will be calibrated regularly in accordance of the established
calibration and maintenance program, as described in the relevant
data sheets and/or applicable method statement.
Health, Safety and EnvironmentGeneral Policy The significant
safety hazards have been identified and analyzed in accordance with
the applicable HSE legal and contractual requirements as well as
with the (*SPECIFY)
Health and Safety Hazards As required by the Project HSE Plan,
the significant health and safety hazards of this work have been
analyzed in accordance with the general procedure Hazard Analysis
and Environmental Impact Assessment and are listed below. Tripping
hazards slip, trips and falls Trapping injuries Falling materials
Traffic accident Defective plant and equipment Collapse of loose
materials at slopes Personnel struck by equipment or vehicle
Equipment tipping Equipment fall from embankment edgesControls will
be implemented to minimize these hazards as set out in the form HSE
Risk Assessment included in Appendix 1.
Protective and Safety Equipment The Protective & Safety
Equipment shall be in accordance with the specifications and the
requirements of the contract. All personnel will be handed out
these items during their site induction. Safety Helmets Safety
glasses Safety shoes Coveralls Work gloves High visibility
vests
Emergency ProceduresIn case of emergency situations, everybody
should follow The (*SPECIFY)
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APPENDIX 1 HSE
Risk Assessment
CLIENT NAME AND LOGO HERE
Method Statement forConstruction of Gabion Protection CONTRACTOR
NAME AND LOGO HERE
Company Project No.Project No.Doc. Class1Distribution Code1
Company Doc. NoDoc. No.Rev. APage 1APPENDIX 1
APPENDIX 2
Assembly, Installation and Filling of Gabions
Assembly and Forming the Structure1. Each gabion mesh will be
unfolded on a hard, flat surface. All kinks will be stretched and
stamped out. It will be made sure that all creases are in the
correct positions for forming the box, one at the edge of each end
panel and each diaphragm.
2. The side and end panels will be folded into the upright
position to form a rectangular box. The top corners of the box will
be joined together with the thick selvedge wire which is sticking
out from the corners of each panel. This will make sure that the
tops of all four sides of the box are level.
3. Wiring up will begin by securing the binding wire at the top
corners of the panels to be joined, by looping it through and
twisting it together. Then the wire will be laced around the
selvedges with single loops and double loops in turn at 100 mm
intervals. Finally, the wire will be fastened securely at the
bottom corner, and the loose end will be poked inside the gabion.
Next, the diaphragms will be lifted into the vertical position and
will be wired up to the side panels in exactly the same way.
4. When possible, small groups of gabions will be wired together
off the site, and then will be carried to the structure as complete
sections for joining to other gabions already in position. The
ground where the gabion structure is to be built will be leveled as
much as possible before placing the empty gabions in position. The
gabions will be wired together, using exactly the same method as
for assembling single gabions. The gabions will be placed front to
front and back to back so that pairs of facing lids can later be
wired down in one go.
5. The empty gabion or group of gabions will be placed in
position. The end from which work is to start will be secured,
through the two corners, into the ground and will be tied firmly to
a good anchorage. The remaining empty gabions will be wired one to
another as work proceeds. The opposite side or end of the gabion
will be stretched. The top and bottom are then will be kept
stretched until the gabion has been filled, by tying them to a
fixed point. While the gabion is being stretched, it will be
checked that the wiring together has been properly carried out and
is not pulling apart. If it is, the section will be rewired. When
on the structure, the gabions will be wired securely along the
sides and ends to the adjoining gabions and to the already filled
gabions below.
Filling1. The filling material to be used will not be larger
than 200 mm and not smaller than the size of the mesh. The gabions
will be filled by hand or by machine, making sure that the stone is
tightly packed and has a minimum of voids. When possible, the last
gabion will left empty, as it is easier to join the next one to it.
All the outside compartments of 1 m high gabions will be filled
only up to one third full. Then horizontal bracing wires will be
fixed in the gabions directly above the level of the stone in those
compartments and the bracing wires will be tied to keep the face
even and free from bulging. Next, the gabion will be filled up to
two thirds and the bracing will be repeated. Finally it will be
filled to the top. 500 mm gabions will be filled in 2 'lifts' with
bracing at half full. In order to allow for settlement the fill
will be leveled off 25 mm to 50 mm above the top of the mesh.
2. The lids will be tightly stretched over the filling and will
be wired down. The corners will be temporarily secured first, to
ensure that there is enough mesh to cover the whole area. Some
filling may have to be removed from the top of the gabion to
prevent the lid from being over-stretched.
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