Method Statement for Excavation and Backfilling for Underground Services
Status Code 2 Comments as Noted 1) Rename the document as "Method Statement for Excavation and Backfilling for Underground Services" 2) For other comments refer the marked-up document Coord PX3/P3, PX3M2 Dated 11-Apr-2015 TL/15/0709
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Doc : 050060 4-MS-00-CA-0014
Method S atement for Road Crossing Underground Service Exca ation Works.
Rev: A0
Page No. 2 of 11
REVISION CONTROL SHEET REV. NO.
DATE
PAGE NO.
DESCRIPT ION
A0
17-12-2014
All
Issued for Review Comments
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Method S atement for Road Crossing Underground Service Exca ation Works.
CONTENTS 1.
Purpose
2.
Scope
3.
Definitions / Ab reviations
4.
References
5.
Responsibilities
6.
HSE Requireme ts
7.
Equipment, Tools and Tackles
8.
Methodology
9.
Inspection and esting
10.
Documentation
11.
Attachments
Doc : 050060 4-MS-00-CA-0014
Rev: A0
Page No. 3 of 11
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Method S atement for Road Crossing Underground Service Exca ation Works.
Doc : 050060 4-MS-00-CA-0014
Rev: A0
Page No. 4 of 11
and backfilling 1.
Purpose The purpose of this docu ent is to outline the sequences and me hods of works intended to be used for the Road crossing excavation for underground service of new office building. The Contractor reserves th right to adapt the methods of execution s contained in this document, modification o this document if required from time to ti e according to specific site conditions. Engineer’s approval will e obtained after each phase of the orks prior to continuation of the works as per Site Inspection and Test Program (ITP)
2. Scope The scope of work cover t he activities related to underground wor s for the New Ruwais Office Buildings Project No: 0500604 at GASCO NPB area fr m the existing GASCO Maintenance buildiing and civil building service tie up poin . This method statement covers all require ents for excavation, fabrication, installatio , inspection. 3. Definitions / Abbreviations COMPANY
Abu Dhabi GAS Industries LTD (GASC )
PROJECT
New Ruwais Office Buildings Project.
CONTRACTOR
M/s ACTCO GENERAL CONTRACTIN
SUBCONTRACTOR/SE VICE PROVIDER –
4.
backfilling,compaction and reinstatement.
CO., LLC.
Any company who contracts with the CONTRACTOR to supply materials or xecute work or 3rd party service forming part f the main contract.
SHALL
Indicates a mandatory requirement
PICWS
Person in charge at site
References. The following reference documents, to the extent specified herein, for a part of this method statement. When a edition date is not indicated for a docu ent, the latest edition in force at the time of contract award shall apply.
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Method S atement for Road Crossing Underground Service Exca ation Works. 4.1
Doc : 050060 4-MS-00-CA-0014
Rev: A0
Page No. 5 of 11
Project Drawings. Approved, Issued fo r Construction (IFC) drawings.
4.2
Project Specificati ns. DGS 1486.002 Rev.2 , 1783.001 and 1783.002
4.3
ITP AND CHECKLI T ITP for Excavation and Backfilling – 0500604-ITP-00-CA-001 Rev C0 Check List for Exca ation – 0500604#18(EXC-RE) Rev#1 Check List for Backfilling - 0500604#19(BF Form) Rev#1
5. Responsibilities . 5.1 Project Manager /Construction manager Has the responsibility to e suring that all the activity is done witho health and safety in accordance with the local legislation, client’s re stipulations laid down in the HSE management system document. under groundwork related a cidents are reported, investigated and tha preventive measures are ta en, the accident investigation team has th any work or operation under his authority on health, safety or environ until effective measures hav been taken.
t endangering uirements and nsure that all corrective and power to stop ental grounds
5.2 HSE Engineer Shall coordinate with the section managers to ensure that suitable arrangements, including traffic signs, barri rs, and warning lights are in place with proper tools to perform the excavation and ackfilling works in safe work manner. We shall assign HSE officers for performing internal inspections, advising to employees on subjects and oncerning health and safety. 5.3 Site Engineer/Supervi or To
ensure that all personnel are adequately trained for the relevant task; that they are using the correct equipment and personal protective equipment; that all relevant hazards have been identifie ; and that the respective permits to work formalities have been correctly addressed, w ere required. Responsible for providing th required PPE to his crew for the job as m ntioned herein this procedure.
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Method S atement for Road Crossing Underground Service Exca ation Works.
Doc : 050060 4-MS-00-CA-0014
Rev: A0
Page No. 6 of 11
Method Statement for 5.4 Foreman Underground Services,Excavation,Ba To ensure that all personnel are adequately trained for the relevant task; that they are ckfilling and Road t at all relevant using the correct equipme t and personal protective equipment; works. hazards have been identifie ; and that the respective Crossing permits to work formalities have been correctly addressed, here required. Must conduct a tool box tallk meeting with his crews about the specified activities and related hazards and control measures to prevent any kind of injury. Responsible for providing the required PPE to his crew for the job as mentioned herein this procedure. 5.5 QA/QC Engineer
QA/QC Engineer shall be re sponsible for the implementation and contr l of the quality procedures as per the appro ed ITP, approved project specification and drawings. He shall ensure that all r quired inspections & tests are perform d and are in compliance with approved pecifications. He shall review and ensur that all shop drawings and material sub ittals are presented to the COMPANY uthorities with adequate supporting doc ments. He shall control non-confor ing products, workmanship and implemen ing the required timely corrective actions. nsure that the required testing is undertaken by approved independent laboratories. Ensuring that materials are inspected when delivered to site and it is complying with he COMPANY approved specifications an maintaining all relevant records of Q /QC activities related to lifting works. 5.6 HSE Supervisor / HSE
fficer
He shall be responsible for ensuring that all involved personnel are attended COMPANY HSE induction nd following HSE regulations, safe work practices, safe working environment and HI A control measures. He shall responsible to con uct work site inspection to ensure that the activities are performing as per COMP NY procedures, standards and regulations. He shall maintain all relevant valid do cuments related to the activity and involved equipments. He shall lead HSE communication with workforce to encourage reportiing of incidents including near-miss incident, hazard identification, risk management nd emergency preparedness. He shall investigate and report all reportable accide ts/incidents to COMPANY authority and contractor management with recommendation to improve control measures for preven ion of the recurrence. He shall be the auth rity to stop the site activities due to an e xistence of unsafe condition. He shall nsure that all personnel are attended H E induction prior to the site assignment and strictly following HSE regulations.
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Method S atement for Road Crossing Underground Service Exca ation Works.
Doc : 050060 4-MS-00-CA-0014
Rev: A0
Page No. 7 of 11
6. HSE Requirements. 6.1 Permit to Work (PTW) GASCO permit to work (PT ) system shall be implemented to control the activities in safe manner for the protecti n of all personnel, assets and environment . Describe the nature of work, involved tools and equipment, work locati n details, start date and time in the work permit. PICWS & Job performers shall be fully aware of activities, regulations and the Permits shall be kept available at all ti es nearby the work area. 6.2 Personal Protective Equipments The contractor shall provide personal protective equipments as required for different operations. All PPEs to be u ed by construction personnel shall be in g od quality and condition. 6.3 Tool Box Talk (TBT) Prior to start the task Engi eer along with the Foreman and the Saf ty officer shall conduct toolbox. They hav to present in detail the task, potential ri k, safe activity implementation and the pre entive control measures, PPE requirements, safe work procedures, HSE regulations and conditions to prevent incident. All concerned workers shall attend toolbox talk and the related records shall be maintained. 6.4 Safe Work practices Best operating practices shall be used to assure the safety and integrity : 6.4.1 All activities shall b planned, supervised and carried out in a safe manner under the control of a competent person, who knows the respo sibilities. 6.4.2 Equipment operatio and Transportation shall be carried out in safe manner controlled by comp tent banks man/flagman as per UAE Traffic regulations and COMPANY reg lations. 6.4.3 All road movement equipments within site parameter shall be controlled by competent banks man/flagman to ensure the speed control and Company regulations. 6.4.4 Ensure always road is cleaned and maintained in good conditio n. 6.4.5 It is essential that alll personnel can communicate in same lang age. 6.4.6 Working area shall e maintained good housekeeping and pro er access. 6.4.7 All equipment shall e suitable for the specified works
and approved by Gasco Maintenance.
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Doc : 050060 4-MS-00-CA-0014
Method S atement for Road Crossing Underground Service Exca ation Works. 7. Tools & Equipment
Rev: A0
Surveying instruments
safety cones,safety protective equipment.
Plant and Equipment `No. 1
escription Asphalt cutter. (Girder disc 8’’by Dwelt)
ty 1 no
2
Hand power tools ( 20 v)
2 nos.
3
Hand excavation to ls
2 nos.
4
Hand Gloves
5
Hand shovel &wheel barrows
6
Hand operated breaker( 220 v. )
set/ erson
7
Hand tools (non ele tric power)
1set/ Person
8
Safety barrier
9
Safety Helmets
1set/ Person
10
Safety Shoes
1set/ Person
11
Fire Extinguisher
Materials No. 1.
1set/ Person 4 nos.
As per site requirements.
1/L cation
12. Jack Hammer 13. Com actor and roller Descrip ion UPVC drain ge pipe
COSMOPLAST co.
MSD vailable YES
2.
Polypropylene R ndom pipes
COSMOPLAST co.
YES
3.
UPVC Duct for underground service
COSMOPLAST co.
YES
4.
GRE pipe for U.G. Service
M/s TYCO co.
YES
5.
Carbon steel s hedule 40 Galvanized &red painted for Above G. level
M/s TYCO co.
YES
Methodology 8.1. Site Preparation. 8.
Page No. 8 of 11
Source
existing underground services in the area
8.1.1 Survey work to locate and identify the guideline of the area. Th CONTRACTOR shall co-operate in preserving all control bench mark monument and stakes, and other markers est blishing lines, elevations, slopes, etc. Th CONTRACTOR shall replace at no c st to the COMPANY, monuments, stak s, and other markers, which he disturbs or destroys during the course of his work.
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Method S atement for Road Crossing Underground Service Exca ation Works.
Method Statement for Underground Services,Excavation,Ba ckfilling and Road Doc : Crossing 050060 4-MS-00-CA-0014 works. Rev: A0
Page No. 9 of 11
8.1.2 Ensure timely submissi on of “Inspection Notification,” other discipline and HSE clearance is obtained p rior to start the installation Work. 8.2 General Aspect •
•
•
Before beginning w rk, the CONTRACTOR shall ascertain the nat re and location of all existing abov and underground services and facilities on site and in adjacent areas by inspecting available plans or, if neces sary, by hand excavation. The C MPANY will make available, for review, any existing layout drawings which cov r the area of work. CONTRACTOR will
be esponsible for confirmation of any such inf rmation given. All construction and installation work shall be executed according to approved design drawing, specification and general practice for Duct pipe work. Contractor shall take every precaution including providing temporary supports,
and safety barriers o protect the existing services and facilitie from damage or interference during construction. •
•
•
Prior to the commencement of all activities, necessary work permit shall be obtained. Toolbox t lk, excavation permit along with relevant drawings shall be submitted in adv nce. No material or equipment shall be stored with in a distance the edge of the exc vation.
f 1 meter from
Road base and bat h surface course materials installed unde previous work shall be carefully e cavated. These materials shall be replace in the backfill process.
•
Unsuitable /surplus materials are carted away to an approved dumping area.
•
Reinstated the surface, ensuring that it is level with surrounding areas.
•
Proper access shall be maintained in the construction area.
•
Remove all the exc ss materials and clean the surrounding a ea for GASCO final inspection and approval.
ABU DHABI G AS INDUSTRIES LIMITED (GASCO) NEW RUWAIS OFFICE BUILDINGS PROJECT No. 0500604
Method S atement for Road Crossing Underground Service Exca ation Works. 8.3 Excavation of Trench for underground Duct service. •
•
•
•
•
•
•
•
Method Statement for Underground Doc : 050060 4-MS-00-CA-0014 Services,Excavation,Ba ckfilling and Road Crossing works. Rev: A0
age No. 10 of 11
manually
Excavation work shall be performed according to common ex avation unless otherwise specified. Before starting excavatiion for cable Duct, fire hydrant and portabl pipe duct- the location and elevation hall be verified and marked on the ground & inspected by consultant, so that th duct excavation for the pipeline can b excavated to correct location and ele ation. Make diversion plan a permitted by GASCO HSE department, and close the road with proper barric des, signboards and battery operated flas ing light as per GASCO HSE requirem nts. Mark the width of the road cutting portion as per the approved road cutting excavation to be performed.
rawing, where
Ensure that the depth and width of the road crossing trench is as per the approved specified dimension of proposed duct bank. Excavations for duct c nstruction shall conform to the locations and elevations indicated on the cons ruction drawings for power duct, fire hy rant &portable water line duct works. Excavation shall extend a sufficient distan e from edge of concrete walls to allo w for the placement and removal of concrete forms, installation of undergro nd services, and for inspection. (to be approved
COMPANY)
Excavations adjacent t existing foundations (where the bottom f excavation is lower than the bottom f foundation) shall be limited to a minimum distance by an imaginary line drawn 3 degree horizontally from the bottom corne of the existing foundation to the bott m corner of the intended excavation. If the excavation needs to be closer tha the minimum, adequate steps shall be t ken to prevent cave-in or weakening o the soil beneath the existing foundation. Asphalt portion shall be cutting by hand operated disc cutter ,this i small groove to the de th 50mm on the both side of excavation l that the portion of excavated area asphalt shall be remove hammer/ hand breaker(220v. electrical hand tools).The remai compacted earth by pi kaxes and hand shovel.
only providing ngthwise, after by Hand jack ing portion of
by
ABU DHABI G AS INDUSTRIES LIMITED (GASCO)
Prepare bedding as per the approved specifications/ IFC drawings' details NEW RUWAIS OFFICE BUILDINGS
Doc : 050060 4-MS-00-CA-0014
PROJECT No. 0500604
Method S atement for Road Crossing Underground Service Exca ation Works. •
Rev: A0
Foundations backfilling shall be age No. 11 of 11 addressed in a separate M/s
Backfilling of foundati ns shall not be carried out until the foundations or structures within the e cavation have been cured and protected in accordance with the Specification f r Concrete Construction.
Approved backfill materials to be used at site.
•
•
•
All forms shall be rem ved and the excavation cleared of loose soil, water and debris after approval of underground installations and just prior to ackfilling. Bedding and backfill shall be compacted by mechanical tamping wherever possible. Hand-compa ted backfill shall be permitted only when mechanical tamping is Impracticall as determined by the COMPANY. H nd-compacted bedding shall be placed in loose lifts not exceeding 50 mm. H nd-compacted Install the protection tiles and the backfill shall be placed iin loose lifts not exceeding 100 mm.
indication tapes as per applicable Machine-compacted backfill shall be placed in loose lifts not exceIFC eding 200 mm. specifications/ drawings details
Machine compactors s all be suitable to the type of soil to be com acted. •
•
Upon completion, all debris and surplus materials shall be dispose of, off Project limits in a manner meetiing all local authority requirements.
Reinstate the area to the initial conditions Remove all the excess materials and clean the surrounding area f r GASCO final
inspection and approvall.
9.
Inspection and Testi g •
ITP for Excavation and Backfilling – 0500604-ITP-00-CA-001 Re C0
•
Check List for Excavation – 0500604#18(EXC-RE) Rev#1
•
Check List for Backfill ing - 0500604#19(BF Form) Rev#1
Check list for Asphalt works.
10.
Documentation Inspection Notification Rec rd shall be documented by the QC Engin er.
11.
Attachments. a) Excavation Checklist.
Indicate the documentation to be produced as part of this activity and the responsible party for the same
b) Backfilling Record Form.
Bedding checklist
ABU DHABI GAS INDUSTRIES LIMITED NEW RUWAIS OFFICE BUILDING PROJECT NO 0500604
BACKFILLING CHECK LIST Location
:
Item
:
Ref.Drawing No :
Report No. :
IN No.
Date
:
: Check
Check Items
Date Accept
1)
Materials for backfill are suitable and approved.
2)
No boulders and rock fragment are included.
3)
The thickness per loose layer is adequate (200 mm) before compaction.
4)
Adequate water sprayed when compacting to mmet the required moisture content �2 % of OMC
5)
Samples for field density test were taken . * Dry density not less than 95% of MDD *Moisture content ±2% of OMC
6)
Test result of field density are above required by specification and IFC drawings.
7)
Recompose all faulted area and test.
8)
Reinstate the complete area same as before.
Reject
Note :
ACTCO Engineer
ACTCO QA/QC
COMPANY/TPI
Name Signature Date
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ABU DHABI GAS INDUSTRIES LIMITED NEW RUWAIS OFFICE BUILDING PROJECT NO 0500604
EXCAVATION RECORD
Project
:
Report No.
:
Location
:
Item
:
DWG No.
:
Subcon.
: Check
Sr. No
Check Items
Date Accept
1)
The work site is cleared
2)
All grasses and weeds including roots were stripped and removed.
3)
Excavation is performed to the lines, grades and slopes as per drawings.
4)
Slopes of all excavations were cut true and straight and loos stones and boulders were removed from the area.
5)
Excavation is made below the elevation indicated on the IFC drawings.Working access areas are provided
6)
Excavation is kept free of water at all times until complete of construction or backfilling.
7)
Soil condition at the bottom of excavation
8)
Reinstate the complete area as before.
9)
Shoring Required (Yes/No); Installed (Yes/No)
Reject
Note :
ACTCO Engineer
ACTCO QA/QC
COMPANY/TPI
Name Signature Date
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