Detail specification of earthwork in excavation in foundation are as below:-
Detail description
Excavation- Foundation trenches shall be dug out to the exact width of foundation concrete and the side shall be vertical. If the soil is not good and does not permit vertical sides, the sides should be sloped back or protected with timber shoring. Excavated earth shall not be placed within 1m (3’) of the edge of the trench.
Finish of trench- The bottom of foundation trench shall be perfectly levelled both longitudinally and transversely and the sides of the trench shall be dressed perfectly vertical from bottom up to the least thickness of loose concrete may be laid to the exact width as per design. The bed of the trench shall be lightly watered and well rammed. Excess digging if done through mistake shall be filled with concrete at the expense of the contractor. Soft or defective spot shall be drug out and removed filled with concrete or with stabilized soil. If rock or boulder are found during excavation, these should be removed and the bed of the trenches shall be levelled and made hard by consolidating the earth. Foundation concrete shall not be laid before the inspection and approval of the trench by the engineer-in-charge.
Finds- Any treasure and valuables or materials found during the excavation, shall be property of the Government.
Water in foundation- Water, if any accumulates in the trench should bailed or pumped out without any extra payment and necessary precaution shall be taken to prevent surface water to enter into the trench.
Trench filling- After the concrete has been laid masonry shall be constructed the remaining portion of the trench shall be filled up with earth in layer of 15cm (6”) and watered and well rammed. The earth filling shall be free from rubbish and refuse matters and all clods shall be broken before filling. Surplus earth not required, shall be removed and disposed and site shall be levelled and dressed.
Measurement- the measurement of the excavation shall be taken in cu m (cu ft) as for rectangular trench bottom width of concrete multiplied by the vertical depth of foundation from general level and multiplied by the length of trenches even through the contractor might have excavated with sloping side for his convenience. Rate shall be for complete work for 30m (100 ft) lead and 1.50m (5’) lift, including all tools and plants required for the completion of the works. For extra lead of 30m and extra lift of 1.5m separate extra rate is provided.
Excavation in saturated soil- excavation in saturated soil or below sub-soil water level shall be taken a separate item and shall be carried out in the same manner as above. Pumping and bailing out of water and removal of slush shall be included in the item. Timbering of the sides of the trench if required shall be taken under a separate item and paid separately.
Earthwork in excavation in foundation-Detailed specification
Copy paste from B N Dutta book...lol
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