Support system and construction method of deep foundation pit near river for pile foundation cap

Abstract

The invention provides a support system and construction method for a pile foundation cap facing a river deep foundation pit. The horizontal movement direction of the sliding connecting frame is limited by suspending beams, and a vertical coiler and a horizontal coiler are used in combination to control the bedding rollers and rollers. The rolling direction of the anti-seepage blanket; the combination monitoring pipe is used to monitor the stability of the soil outside the pit and the water level; the recovery grouting pipe and the retaining grouting pipe are set in the soil outside the pit, which can be grouted to form a grouting solidified body; through The outer guide plate defines the driving direction of the steel sheet pile; during the insertion process of the steel sheet pile, the pile side pressure grout construction is carried out through the built-in grouting pipe simultaneously; The pressure body exerts a lateral pressure on the steel sheet pile; the position of the back pressure bag is limited by the bag bottom support plate and the bag side support plate, and the back pressure bag can be squeezed by the bag filling liquid, which can improve Improve the stability of foundation pit support structure, improve the anti-seepage performance of steel sheet piles, and reduce the difficulty of treatment of seepage diseases.

Description

technical field [0001] The invention relates to the field of waterfront foundation pit engineering, in particular to a support system for a deep foundation pit near a river for a pile foundation cap, which can improve the stability of a foundation pit support structure, improve the impermeability of steel sheet piles, and reduce the difficulty of treatment of seepage diseases. and construction methods. Background technique [0002] During the construction of riverside projects, the stability of the water-retaining structures on the waterfront side is often the focus and difficulty of engineering control due to the influence of external water level. [0003] There is a foundation pit support system and a construction method in the prior art. The support system includes a top frame, the top frame is connected with a telescopic piece, the telescopic piece is arranged on the ground, the top frame is connected with the bottom frame, and the outer side of the bottom frame is conne...

AI Technical Summary

Problems solved by technology

Although this technology does not require the construction of temporary structures such as retaining piles and anchor cables, the expansion parts involved in it occupy a large space, and it is difficult to simultaneously solve the seepage problem of the foundation pit

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