Filling in trenches, plinth, under floors shall be commenced soon after the joints and pipes, cables, conduits etc. have been tested and passed. The space around the pipes etc. shall be cleared of all debris, brick bats etc. Where the trenches are excavated in hard/soft soil, the filling shall be done with earth on the sides and top of pipes in layers not exceeding 20 cm in depth. Each layer shall be watered rammed and consolidated. Ramming shall preferably be done by rammers. All clods and lumps of earth exceeding 8 cm in any direction shall be broken or removed before the excavated earth is used for filling. In case of excavation of trenches in ordinary/hard rock, the filling upto a depth of 30 cm above the crown of pipe, cable, conduits etc. shall be done with fine materials like earth, moorum or pulverized decomposed rock according to the availability at site. The remaining filling shall be done with boulders of size not exceeding 15 cm mixed with fine material like decomposed rock, moorum or earth are available to fill up the voids, watered, rammed and consolidated in layers not exceeding 30 cm. Deleterious material shall not be used. Ramming shall be done with iron rammers where feasible. Special care shall be taken to ensure that no damage is caused to the pipes, cables, conduits etc. laid in trenches. In case of filling under floor, the finished level of filling shall be kept to the slope intended to be given to the floor.
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