particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 440 23.3 Pumping: without damaging the foundation excavation or works. Where practicable, all substructures shall be constructed in open excavation and where necessary the excavation shall be shored and braced or protected by cofferdams. The cofferdam should be carried to adequate depts. And heights, safely designed and constructed with suitable dimensions and protection and shall be made as water-tight as practicable for facility of construction of the work to be done inside them. The interior dimensions of the cofferdams shall be such as to give sufficient clearance for the construction and inspection and to permit installation of pumping machinery etc. inside the enclosed area. The cofferdams shall be sufficient heights to prevent ingress of water into the foundation pits and to protect green concrete or masonry against damage from tides or sudden rising of the steam and to prevent damage of the foundation by erosion. Unless otherwise permitted, no excavation shall be made outside the enclosed area and the natural stream bed adjacent to the foundation shall not be disturbed without permission from the Engineer. Cement grouting or other approved methods may be used at the discretion of the contractor to prevent or reduce seepage and to protect the area to be excavated if the soil is porous. Adequate pumping arrangements shall be made for dewatering foundation trenches and other areas of construction where dewatering is essential and keeping them dry while masonry or concrete or other construction is in progress and till the concrete or mortar of masonry has sufficiently set and construction can be proceeded without pumping.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 441 Pumping of adequate capacity and in required numbers shall be provided to ensure the above. Pumping from the foundation trenches or from the interior of the cofferdam or other areas of construction shall be done in such a manner as to preclude the possibility of the movement of water through any fresh concrete or masonry and washing away parts of concrete or mortar. No pumping will be allowed during placing of concrete or for a period of at least 24 hours thereafter unless it is done from suitable sump separated from concrete or masonry by effective means. The contractor should make his own arrangement for necessary labour, materials and equipment for cofferdams, pumps, engines and other machinery and devices required for successful execution of the item of dewatering. 23.4 Desilting: 23.5 Removal: If any foundation pits are filled due to floods or flow or blows or slips during the progress of the work or during the rainy season or due to any other cause, all pumping required to dewater the pits and to do desilting shall be done without making extra claims. The cofferdams and other works constructed from facility of diversion and/or dewatering shall not cause any damage to property and work and shall be removed after they have served their purpose in a manner and to the extent directed by the Engineer. If any excavation is made outside the enclosed area for facility of construction, the contractor shall refill the same with proper ramming after the foundation work is completed so as to bring the river bed to its original condition of and as directed by the Engineer. Similarly any material deposited within the
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