Method Statement for Deep Excavations
Subrahmanaya S Murthy Tata, MLE℠ at Harvard Square.
B.E,M.Tech,MCIOB,M.CI,FIE,M.ASCE,M.CI,MICE(I),MISE(I),FIIV,PE
C. Engr. Chartered Construction Manager
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Method Statement for Deep Excavations, Lecture notes of Engineering
Scope of work: The scope of work applies to all excavations with depth more than 2.0m which includes basement excavations, pile boring, etc. Responsibility:.
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2021/2022
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Method Statement for Deep Excavations
Subrahmanaya S Murthy Tata, MLE ℠ at Harvard Square. B.E,M.Tech,MCIOB,M.CI,FIE,M.ASCE,M.CI,MICE(I),MISE(I),FIIV,PE C. Engr. Chartered Construction Manager
Scope of work: The scope of work applies to all excavations with depth more than 2.0m which includes basement excavations, pile boring, etc. Responsibility: The Project Engineer/site engineer is responsible for the supervision of deep excavations. Chief engineer will bear the overall responsibility. Project engineer/site engineer will assist chief engineer in reviewing the Method Statement submitted by contractor and approve the same and also to supervise the excavation works as stipulated in the procedure. Documents:
- Approved foundation drawings with depth of excavation, which shall include the Design depth as per drawing, levels, Excavation protection measures viz, Sheet pile or soldier piles or shoring drawings
- Structural drawings showing the foundation details
- Approved Method statement of contractor.
- safety and environmental measures. Method of excavation: Obtain the good for construction drawings from the Architect/Engineer. Engineer refers to the Geotechnical/Structural consultant. Review and study the drawings well in advance viz before the start of construction and obtain all clarifications from the Architect/engineer. Demarcate the excavation setting out plan with reference co-ordinates and levels. Please note that the survey bench marks are away from the excavation in order to prevent the damage to markers and to maintain accuracy. Cable or utilities scanning has to be done in order to avoid the cables and pipes and underground utilities damage. It is recommended to go for trial pits so that underground utilities can be find out. Protect and support underground utilities. Mobilize the machinery for excavation. Start the excavation from one end and proceed to another end in layers such as one meter depth layers. If the excavation depth exceeds 2.0m depth, it is necessary to protect the sides of excavation by driving sheet piles or soldier piles or timber shoring with strutting. The vertical members to protect the excavation is to be driven first followed by horizontal members. The other option is to provide slope not less than 1:1.5 with intermediate berms and the slopes have to be protected by short creting or planting grass etc. After the completion of excavation 0.5m below the first strut level, install the first strut as per the drawings.The procedure may be repeated till the bottom of excavation. If the excavation is deep, it is better to provide long arm excavators to reach the required level. Stack the soil away from the excavation edge to prevent soil collapsing to the excavation area.
RESPONSIBILITY MATRIX FOR DEEP EXCAVATIONS
S.NO ITEM ARCHITECT/ CE PE SE SO/SS
CONSULTAN
T
- Construction Drgs R A C
- Levels/Co-ordinates R A
- Barricading R
- Workers Training R A 5 ) Proper Access R A
- Lighting R A
- Excavation protection R A
- Machinery condition R
- Pumps availability R A
- Silt traps R A
- Sedimentation tanks R A
- Excavation final R A C approval
- Dumper speeding A
- Competency of R A operators
- Enough banks R A C man/signal man
- Prevent mud water R pumping into drains
- Safety PPE A R
- Review and approval R A C of Method statement of Contractor
- Overall safety A C C R
- Overall quality R A C R….Responsible A..Authorised C.. Can be authorized CE..Chief Engineer PE...Project Engineer SE...Site Engineer SO..Safety Officer SS...Safety Supervisor
RISK ANALYSIS FOR DEEP EXCAVATIONS
S.NO HAZARD RISK LIKELY SEVERITY RISK CONTROL
LEVEL HOOD MEASURES
1 Workers falling in Low Low High Provide barricading to excavation around the excavation. 2 Workers hit by Low Low Medium Appoint banks man excavator to control excavator movements 3 Soil collapse Low Low Medium Stack soil away from excavation 4 Flooding of water Low Low High Provide enough in to excavation pumps 5 Workers falling High Low Medium Provide proper from the slopes access with hand railing 6 Workers hit by High Low Medium Appoint signal man dumpers to guide dumpers movement 7 Workers working High Medium High Provide enough in dark lighting 8 Excavators over High Low High Appoint competent turning operators 10 Collision of Medium Low Medium Appoint signal man dumpers 11 Sudden down pour Low Low High Provide alarm to evacuate the workers.
SAFETY CHECK LIST FOR DEEP EXCAVATION
Project ID:- Location:- Bldg. No. Date:- S.No ITEM DESCRIPTION YES NO Signature of site engineer 1 Sign boards are kept at all visible places 2 All the excavation area is properly barricaded 3 Enough banks man are appointed 4 Enough signal man are appointed 5 Enough flood lights are provided 6 Condition of excavator is checked by operator on daily basis. 7 Speeding of dumpers is ok. 8 Conditions of dumpers viz no spillage of soil from sides or top. 9 Access to the excavation bottom is proper. 10 Fire extinguisher is available near by area 11 First aid is available with trained first aider. 12 Alarm is available in case of emergency evacuation. 13 Sufficient Pumps are available 14 Collection pit is available 15 Excavation slopes are properly protected Verified By Approved By
ENVIRONMENTAL CHECK LIST FOR DEEP EXCAVATION
Project ID:- Location:- Bldg. No. Date:- S.No ITEM YES NO Signature of site DESCRIPTION engineer 1 Water is sprinkled to avoid dust pollution 2 No mud water is pumped in to public drains 3 No contaminated water is pumping into public drains 4 All the soil slopes are protected from erosion of soil. 5 Smoke emitting from the machinery is ok 6 Noise levels are less than 70db 7 Sedimentat ion tank is available 8 Silt traps are provided 9 Temporary excavation drainage is ok. Verified by Approved By