Structures Excavation & Backfilling

5.0  Methodology

Excavation & Disposal.
• Limits of excavation would be identified from the approved drawings given by the Engineer. The Surveyor/TO/SE would set out the excavation and reference levels would be marked on pegs as directed by the SE and would be notified to the Engineer for approval.
• The excavation would be carried out using either back-hoe or wheel back-hoe loader or manually. Level of the excavation height would be controlled by the Technical Officer/Supervisor as given in. the Engineer’s approved drawings.
• Material classified as unsuitable would be removed to an approved disposal area, by the tractor-trailer / dump truck. Suitable material will be stock piled at the site depending on the space availability, provided with well-drained facilities; in case no such locations are available it would be transported by tractor-trailers and/or dump trucks to the Contractor’s central yard.
• Any excess excavation would be corrected to the approved levels and lines with suitable material approved by the Engineer.

Back filling:
• Back filling would be with material approved as embankment type 1 or type 2. It would be obtained from borrower pit or from the structure, drain excavation if suitable for back filling.
• Back filling will be started all overall structure after 7 days completed  in a manner not to cause undue thrust on any part of the structure.
• Back filling would be carried out by using either manual mean or using a suitable mechanical devises and compacted by rammers or vibrating rollers, if possible to apply.
• Filter media and geo textile would be provided around weep holes as specified in construction drawing.
• The methodology for placing and compaction of filling materials would be followed same as Embankment Construction methodology.

6.0 Safety Plan

6.1  Safety Management Action Plan

In order to minimize the occurrence of site accident, the provision of a safe working environment for workers to work is essential.  Our company endeavors to make a zero accident record in areas where the roadway excavation is done.  In addition to the above, the following safety precaution must also be implemented in achieving the minimization of site accidents while roadway excavation.

6.1.1 Site Staff and Labor

• Personal Protective Equipment (PPE) such as safety boots and helmets would be provided with workers.  In addition, adequate PPE (e.g. ear and eye protectors) should also be available for construction works as required.
• All tools, plant, equipment and temporary facilities and all other items use to carry out the work should be in a safe, sound and good condition.
• Alcoholic drinks and other substances, which may impair judgment, would be prohibited from the Site.
• Working Radius: Mamoties and jungle clearing knife should have working space to move freely without hurting other employees.
• Signalmen would be deployed if the work spaces disturb traffic flow in the main road.  A traffic supervisor would also be deployed to take responsibility over the traffic control.

• First Aid Facilities: First aid facilities such as a first aid box would be made available for in case of minor injury treatment.
• All workers involved in the blasting work at the site would be informed to stay at a safer distance before start the blasting work.

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