Foundation pit supporting composite retaining wall with water pumping and recharging function and construction method thereof

Abstract

The invention provides a foundation pit supporting composite retaining wall with water pumping and recharging functions. The foundation pit supporting composite retaining wall comprises a plurality ofpipe piles, connecting structures, a water pumping structure and a recharging structure. The plurality of pipe piles are arranged in the circumferential direction and are of hollow structures; the connecting structures are connected with the two adjacent pipe piles to form a circumferentially closed retaining wall; the water pumping structure is arranged on the pipe wall of at least one pipe pile, faces the inner side of the foundation pit, communicates with a soil body on the inner side of the foundation pit and the hollow structure, and is suitable for guiding underground water on the innerside of the foundation pit into the hollow structure of the pipe pile; the recharging structure is arranged on the pipe wall of the pipe pile provided with the water pumping structure, faces the outer side of the foundation pit, is located above the water pumping structure and communicates with the soil body and the hollow structure on the outer side of the foundation pit, is suitable for recharging the underground water in the hollow structure into the soil body on the outer side of the foundation pit. The invention further provides a construction method of the foundation pit supporting composite retaining wall.

Description

technical field [0001] The invention relates to a construction method of a retaining wall in the field of foundation pit support, in particular to a foundation pit support composite retaining wall with the function of pumping and recharging and a construction method thereof. Background technique [0002] The cement-soil retaining wall in the prior art is usually drilled into the soil body through the drill pipe and drill bit of the drilling rig, and then the cement slurry is injected into the soil body through the grouting pipe to form the cement-soil pile body; For the cement-soil pile retaining wall, the pile holes drilled by the drilling rig need to have overlapping parts. However, although the pure cement-soil occlusal pile retaining wall has good water-stop performance, its ability to retain soil is poor; The soil capacity of the concrete piles is the reason for the retaining wall. Concrete pile retaining wall has better soil retaining capacity because of its strong s...

AI Technical Summary

Problems solved by technology

Although this kind of retaining wall reduces the number of piles and reduces the reduction compared with the double-row pile retaining wall; compared with the plug-in sheet pile retaining wall, it reduces the requirements for insertion accuracy, and Water-stop components can also be recycled and reused, but the construction period of concrete piles is long, and the number of concrete piles that play the main role of retaining soil is large, resulting in relatively high costs

[0005] In addition, the soil inside the foundation pit is likely to contain a lot of groundwater. When excavating the foundation pit, it is likely that the construction will be inconvenient due to too much groundwater. It is necessary to insert a separate suction pipe to pump out the groundwater before excavation.

Inserting the suction pipe separately will lead to an increase in construction costs and an increase in the construction period

[0006] Furthermore, since the groundwater inside and outside the foundation pit is connected, if the groundwater inside the foundation pit is pumped out, the groundwater outside the foundation pit will also be pumped out to a greater or lesser extent; once too much groundwater outside the foundation pit Being pulled away may lead to instability of the ground outside the foundation pit, such as soil collapse, which will affect the surrounding buildings; in order to solve this problem in the prior art, the soil outside the foundation pit is usually filled with water to supplement and avoid Soil subsidence; however, using separate equipment to deal with groundwater recharge will inevitably lead to high construction costs and complicated operations

[0007] Therefore, it is necessary to propose an improved foundation pit support and retaining wall structure, which can achieve the effect of simple overall construction operation, short construction period and low cost for soil with large water content, and can avoid the surrounding soil risk of soil subsidence due to lack of water

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