Device and method for controlling influence of foundation pit excavation through active type isolation piles

Abstract

The invention discloses a device for controlling the influence of foundation pit excavation through active type isolation piles. The row of isolation piles are embedded into an active area soil body arranged between a foundation pit enclosure structure and a protective area soil body, and the distance between every two isolation piles ranges from 3 m to 5 m; a grouting casing pipe is arranged at the position, close to one side of a foundation pit, of each isolation pile, and each grouting casing pipe is internally provided with prefabricated grouting points; the side face of the other side ofeach isolation pile is provided with multiple soil pressure meters from top to bottom, and the soil pressure meters are used for monitoring the soil body pressure at any moment; prefabricated piles are adopted as the isolation piles; the diameter of each grouting casing pipe ranges from 100 mm to 300 mm; and PVC pipes are adopted as the grouting casing pipes. The prefabricated grouting points on the grouting casing pipes are uniformly distributed in the length direction of the grouting casing pipes, and the distance between every two prefabricated grouting points equals to the diameter of thecorresponding grouting casing pipe. The soil pressure meters are in one-to-one correspondence with central positions of prefabricated grouting points of grouting casing pipes arranged at the other sides of the isolation piles. The device is low in cost and high in flexibility; the construction period is not affected; and the deformation control requirement of foundation pit excavation for an adjacent protective area is met.

Description

technical field [0001] The invention relates to the technical field of foundation and foundation engineering construction, in particular to a method for controlling the deformation of soil in an adjacent protected area by excavation of a foundation pit. Background technique [0002] With the rapid development of the city, more and more urban underground tunnels have been put into operation, coupled with the shortage of urban land, the environmental conditions around the foundation pit have become more and more complex, and the deformation control standards for the impact of the foundation pit on the surrounding environment have also changed. increasingly strict. The impact of foundation pits on the surrounding environment and deformation control has been developed from centimeter-level deformation control requirements for adjacent existing buildings, roads, underground pipelines, overpasses, etc., to millimeter-level deformation control requirements for adjacent operating su...

AI Technical Summary

Problems solved by technology

[0004] First, it is difficult to accurately control the deformation of the soil in the protected area simply by means of isolated piles. Insufficient deviation correction or even excessive deviation correction cannot meet the requirements of deformation control, and a series of follow-up treatments are still required.

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