Slag removal technology of underground continuous wall in silt and sand layer?

Firstly, the appropriate mud parameters are determined by tank test, and then the sand content of mud in the tank is reduced by mud circulating filter device (desander). Two commonly used machines: BE250 desander and BE375 desander.

1. Control of sediment thickness at the bottom of bored pile.

According to the Technical Code for Building Pile Foundation (JGJ94-2008), before grouting for bored piles with different bearing types (end bearing piles, friction piles, end bearing friction piles and friction end bearing piles), the control standards of sediment thickness at the bottom of piles are: end bearing piles should not be greater than 50mm；; Friction pile, should not be greater than100 mm; ; Uplift piles and horizontal resistance piles should not be greater than 200 mm.

2. Treatment of the joint between the cyclone pool in the slag washing ditch and the underground continuous wall.

There is a gap of 500mm at the joint between the cyclone pool and the underground continuous wall of the slag flushing ditch. After the construction of the underground continuous wall of cyclone tank is completed, five high-pressure jet grouting piles with a diameter of 1000mm and a depth of 25m are respectively set at the joint and outside of the slag washing ditch and cyclone tank to connect the slag washing ditch with the underground continuous wall of cyclone tank.

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