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SPECIFICATION FOR EARTHWORK IN EXCAVATION FOR FOUNDATION – ALL YOU NEED TO KNOW

SPECIFICATION FOR EARTHWORK IN EXCAVATION FOR FOUNDATION

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 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 side must be sloped back or shored up carefully. Excavated earth shall not be placed within 1 meter (3 feet) of the edge of the 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. It 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.

  1. Water, if any accumulates in the trench, should be bailed or pumped out without any extra payment.
  2. Necessary precautions shall be taken to prevent surface water to enter into the trench.

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 shall 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 cm (6″) 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 leveled and dressed.



Measurement.

  1. The measurement of the excavation shall be taken in cubic meters (cubic feet).
  2. Volume = Rectangular trench bottom width X Vertical depth of foundation from the ground level X length of trenches.
  3. Do not consider extra volume due to sloping sides excavated by contractor for his own convenience.
  4. Rate shall be for complete work for 30 m *100 feet) lead and 1.50 m (5 feet) lift.
  5. Rate shall include all tools and plants required for completion of the work.
  6. For every extra lead of 30 m and every extra lift of 1.5 m, separate extra rate is provided.

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