The Constructor

Excavation and Backfilling of Soil – Work Sequence and Procedure

excavation and backfilling of soil

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Earthwork in excavation and backfilling of soil upto required depth is required for construction of foundation and trenches. The proper sequence of excavation and backfilling is required to optimise the process and prevent safety issues. Excavation and backfilling of soil is a very important part of construction process, and care must be taken while excavation in safety perspective. Different soil layers may be encountered while excavation, dewatering may be needed sometimes. These points must be kept in mind to take necessary action during excavation and backfilling. Correct measurement of excavation and backfilling is required because excavation cost is major part of the foundation construction.

Excavation and Backfilling of Soil

Following are the sequence of works for excavation and backfilling of soil:

Materials and Tools Used for Excavation

The following are the equipments used for the earthwork for foundation:

Drawings required for excavation

  1. Centerline Drawing
  2. Layout Plan

Scope of Work for Excavation and Backfilling of Soil

Working Procedure for Soil Excavation

The extent of soil and rock strata is found by making trial pits in the construction site. The excavation and depth is decided according to the following guidelines in the site.

Fig: Earthwork in Excavation by using hydraulic Excavator

Setting out or ground tracing is the process of laying down the excavation lines and center lines etc. on the ground before the excavation is started. The centerline of the longest outer wall of the building is marked on the ground by stretching a string between wooden or mild steel pegs. Each peg may be projected about 25 to 50 mm from the ground level and 2m from the edge of the excavation. The boundary is marked with the lime powder. The center lines of other walls are marked perpendicular to the longer walls. A right angle can be formed by forming 3, 4 and 5 triangles. Similarly, outer lines of the foundation trench of each cross walls and are set out.

Backfilling and Removal of Excess Soil

Estimate the excavated stuff to be re-utilized in filling, gardening, preparing roads, etc. As far as possible try to carry excavation and filling simultaneously to avoid double handling. Select and stack the required material in such a place that it should not obstruct other construction activities. The excess or unwanted material should immediately be carried away and disposed off by employing any of the following methods.

Quality Checks for Excavation

Quality Checks for Backfilling

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