Method for reinforcing slope protection piles during deepening of foundation pit

Abstract

The method comprises the following steps that before the foundation pit is deepened, a revetment at the edge of the upper end of the foundation pit is excavated to expand outwards, and after the revetment is expanded, a reinforcing pile is put into the portion, located on the side, away from the foundation pit, of each revetment pile outside a waterproof curtain; an annular reinforcing top beam is arranged at the upper ends of the reinforcing piles, and the upper end of each reinforcing pile is fixedly connected with the reinforcing top beam; a plurality of connecting beams are annularly arranged between the reinforcing top beam and the original top beam at intervals, the connecting beams correspond to the reinforcing piles one to one, one end of each connecting beam is connected with the upper end of the corresponding reinforcing pile, and the other end of each connecting beam is fixedly connected with the upper end of the slope protection pile close to the corresponding reinforcing pile; the bottom wall of the foundation pit is excavated and deepened, after the foundation pit is deepened, a bottom ring beam and a waist ring beam are arranged in the foundation pit along the edge of the bottom wall and the edge of the waist portion of the foundation pit correspondingly, and anchor cables which are downwards inserted into soil beside the foundation pit are arranged on the bottom ring beam and the waist ring beam correspondingly. The construction is convenient, and the cost is controllable.

Description

technical field [0001] The invention belongs to the technical field of foundation pit support and reinforcement, and in particular relates to a method for reinforcing slope protection piles when foundation pits are deepened. Background technique [0002] At present, in order to prevent the edge of the foundation pit from collapsing, slope protection will be set at the upper edge of the foundation pit, and a support system will be set at the edge of the foundation pit, such as figure 1 As shown, the support system includes slope protection piles distributed around the edge of the foundation pit and vertically down into the ground, and an annular water-stop curtain is set outside the annular area surrounded by a plurality of slope protection piles. The edge is provided with a ring-shaped original roof beam connected to the upper end of each slope protection pile, and the slope protection pile is provided with multiple anchor cables that are lowered into the soil next to the fo...

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Problems solved by technology

[0002] At present, in order to prevent the edge of the foundation pit from collapsing, slope protection will be set at the upper edge of the foundation pit, and a support system will be set at the edge of the foundation pit, such as figure 1 As shown, the support system includes slope protection piles distributed around the edge of the foundation pit and vertically down into the ground, and an annular water-stop curtain is set outside the annular area surrounded by a plurality of slope protection piles. The edge is provided with a ring-shaped original roof beam connected to the upper end of each slope protection pile, and the slope protection pile is provided with multiple anchor cables that are lowered into the soil next to the foundation pit, but if the foundation pit needs to be modified due to engineering changes When deepening, the original support system has been difficult to meet the support needs of the deepened foundation pit. If the support system is completely rebuilt after the foundation pit is deepened, the cost will be high

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