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Reasons why the reinforcement cage of bored cast-in-place pile cannot be lowered
Reasons why the reinforcement cage of bored cast-in-place pile does not float up:
The reinforcement cage is affected by buoyancy in mud and concrete. The buoyancy is related to the specific gravity and sand content of mud and concrete, but buoyancy is not the main reason why the reinforcement cage cannot go down
The rising adhesion (friction) of concrete to the reinforcement cage during concrete pouring is a factor leading to the floating of the reinforcement cage,
Its size mainly depends on the initial setting time, fluidity (workability) and pouring temperature of concrete, the total pouring time of concrete and the common buried depth of conduit and reinforcement cage in concrete.
The supporting force mainly comes from the impact force generated by the potential energy when the concrete is poured downward from the funnel,
When the concrete flows out from the bottom of the tremie and rises upward, the downward impact force changes to the upward supporting force. The supporting force is the main factor leading to the floating of the reinforcement cage. The supporting force of the reinforcement cage is related to the potential energy during concrete pouring, pouring speed, fluidity of the first batch of concrete, surface elevation, conduit bottom elevation, and the elevation of the bottom end of the reinforcement cage.