BID DOCUMENT - IDCO

(b) The length width and depths of all excavations shall be sufficient to provide for the necessary working
space shuttering and any other temporary structures required during construction of all excavations shall be
measured net and neither allowance shall made for the extra space for working etc. nor for the increase in bulk
after excavation.
(c) Any excavation including excavation in rock made in error below the level shown on the drawings or below
the levels ordered by the engineer will not be paid for and shall be brought back to the specified levels with
mass concrete at the contractor’s own expense.
(d)
(e)
Where indicated the excavation shall be out to slopes the cost of which be included in the rates.
No concrete or screed shall be placed in any excavation without the prior approval of the Engineer.
(f) Mechanical excavation shall not be carried down to within less than 15 cm. above the required formation
level the last 15cm will be removed by hand. If required by the engineer this 15 cm. shall not be removed until
immediately before concreting takes place.
1.02 REMOVAL OF UNSUITABLE MATERIALS
Where unsuitable materials in encountered at the exposed formation level in excavations or immediately there
under it shall be excavated to such levels as the engineer shall direct. The resultant excavations shall be back
filled with selected materials deposited and compacted in layers of 15 cm as directed by the engineer. Such
excavations shall be measured in accordance with the relevant item in the bill.
1.03 TEMPORARY DRAINAGE AND TIMBERING
(a) During the whole time that the excavations are open they shall be kept dry. The contractor shall construct
temporary drains and bunds to prevent the entry of surface water excavate and maintain all drains bunds and
provide and operated all pumps necessary to collect and remove all water, which enters into the excavations.
(b) The contractors shall be solely responsible for the safety and stability of the excavations. He shall at his
own cost slope the sides of the excavations or provide timber supports built and secured to the satisfaction of
the engineer in order to prevent the occurrence of subsidence or slips.
(c) The contractor shall at his own cost promptly provide and maintain any temporary drainage or other
protective measures required by the engineer. Compliance with the engineer’s instructions in this respect shall
not however relieve him of his sole responsibility for the stability of the excavations on site.
1.03.1 DISPOSAL OF SOIL
(a)
Spoils from the site shall be disposed off within the areas as directed by the engineer.
(b) Under no circumstances shall the spoils from the site be sold or given away to any unauthorized party for
any consideration.
1.04 EARTH FILLING IN PLINTH
Fill material should be well-graded natural inorganic soil approved by the engineer and meeting the following
requirements
(a) It shall be free of organic or other weak or compressible materials and be of such nature and character
that it can be compacted to the specified density on a reasonable length of time.
(b) It shall be free of highly plastic clay or all materials subject to decay, decomposition or dissolution and
corrosion etc.
(c)
It shall have a maximum dry density of not less than 1590 Kg. Per cubic meters
(d) It should have liquid limit of 35 to 40% and P.I. value of 5 to 7
(e)
Earth available from trench cutting any also be utilized for filling plinth if it meets the above requirements.
(f) The work under plinth or any places to make up level with sand having FM not less than 0.8
(g) Earth shall be filled in plinth in 15cm. Layers and in each shall be compacted to the entire satisfaction of
the engineer by vibration roller/power hammer at optimum moisture contents. The contractor shall be very
careful regarding foundation walls/columns so that no harm is done during ramming.
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