Chairs In Raft Foundation

Is spacing will be 800mm to 2000mm.

Chairs in raft foundation.

Of main bars supported on it i e. They are often used on foundation footings concrete slabs and other flatwork. Chairs are placed to minimize the bending of top reinforcement due to self weight and to keep the spacing between the top and bottom bars. Spacing of chairs in raft footing depends on its diameter length height and no.

You need to use them because as workforce walks over the crossings they can alter reinforcement position level. The most common type of chair simply suspends the rebar off the ground so that it becomes fully embedded in the concrete as it is poured. Chairs are basically supports that can be made of same reinforcement or other thin material to properly place reinforcement bars in position before concrete is put over. If external loading like men walking over it is there heavy chairs will have to be placed at close spacings.

During site construction reinforcement chair or sometimes called as rebar spacer steel chair or simply chair is commonly seen in raft or mat foundations.