Describe any two design considerations for Precast Canal lining.

Describe any two design considerations for Precast Canal lining.
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1 Answer

Answer :

1. Precast concrete slabs, laid properly on carefully prepared sub-grades and with the joints, effectively sealed, constitute a serviceable type of lining. The precast slabs are about 5 to 8 cm thick with suitable width and length to suit channel dimensions and to result in weights which can be conveniently handled. Such slabs may or may not be reinforced. 2. This type of lining is best suited for repair work as it can be placed rapidly without long interruptions in canal operation. Being prepared under controlled conditions, the quality of its concrete is good. It is easy to lay, involving less site operations; and it is cheaper compared to in-situ concrete lining. 3. Slabs being of small size, there are less shrinkage cracks; also repair of a damaged unit is easier; and, water pressure from ground water gets released through numerous joints that are there. 4. However, seepage losses are obviously more. Transportation of precast slabs may contribute to breakage. 
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