bulkhead
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bulkhead
HB50
<ceiling> lowered portion of a ceiling, usually to accommodate a projecting structure or services
<pipeline> partition built across a trench on sloping ground to prevent, or impede, the potentially rapid flow of surface and ground water through the embedment material and the subsequent erosion of embedment material and fill materials from the trench
<pipeline> partition built across a trench on sloping ground to prevent, or impede, the potentially rapid flow of surface and ground water through the embedment material and the subsequent erosion of embedment material and fill materials from the trench
Bulkheads have the additional function of retaining the pipe, to prevent longitudinal and lateral movement of the pipe on steeper gradients. Normally, a wall of concrete poured around the pipe, which is keyed into the trench walls and floor to form a pipe anchor, and which extends to within 300 mm of the finished surface level. Drainage holes, through the wall, are located in the lower part of the embedment zone to eliminate long-term retention of water behind the bulkhead.
<roof> box-shaped structure which projects above a roof or similar, to enclose the head of a stairway, lift shaft or other such opening