EARTH WORK IN EXCAVATION OF FOUNDATION.

EARTH WORK IN EXCAVATION OF FOUNDATION.

Earthwork in excavation in foundation trenches or drains not exceeding 1.5m in width and 10sq. m in plan including dressing of sides & ramming of bottom, disposal of surplus excavated soil within 50m lead & 1.5m lift. All excavation operation shall include excavation and getting out the excavated matter.

Stability of existing structures. 

Before starting excavation trial pits should be dug to ascertain the depth and nature of its foundation. Shoring should be used in all cases when the depth of excavation exceeds its distance from the existing structure. 

Excavation. 

Foundation trenches shall be dug out to the exact width of the foundation concrete and the sides of the trenches shall be left plumb where the nature of soil admits of it. Where the soil is not good and does not permit vertical sides, the sides Fut be sloped back or shored up carefully. No excavated material shall be placed within 1 m (3') from the edge of any trench. 

Finish of trench. 

The bottom of the foundation trenches shall be perfectly level both longitudinally and transversely and or completion shall be slightly watered and well rammed. Excess digging if done by mistake or otherwise shall be filled up with concrete. If any soft places come to light on inspection or by ramming, they shall be dug out as directed by the Engineer incharge and filled with concrete or with stabilized soil. 

Water in excavation. 

The contractor shall arrange boiling out water in the foundations or trenches due to rains. The pumping out of water caused by springs, sub-soil water or river seepage and broken water mains or drains for which the contractor is not responsible shall be arranged by the department and the cost of the same is not included in the rate. 

Finds. 

Any valuable materials or treasure found during the excavation shall be the property of the Government. 

Precaution. 

All materials and labour required for fencing in and protecting against risk of accident due to open excavation all be provided by the contractor.

Obstructions. 

When the rocks or remains of old buildings are met with, the material shall be removed unless specifically ordered otherwise by the Executive Engineer Blasting if required will not be allowed without the permission in writing of the Executive Engineer. In case blasting is essential, extra rate to be paid shall be fixed in writing before the work is put in hand. 

Completion. 

After construction of foundation, the remaining portion of trenches shall be filled up with earth in layers of 15 16) and watered and well rammed. The filling of earth shall be free from brick bats and clods. All surplus earth shall be removed and site shall be levelled and dressed.

Measurement. 

The measurement of the excavation shall be taken in cu m i.e., length x breadth x depth. Rate shall be paid for complete work including 30 m lead and 1.5 m lift. Separate extra rate is provided for extra 30m lead and extra 15m lift.