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Construction method of anti-seepage system after foundation pit

A construction method and foundation pit technology, which is applied in infrastructure engineering, excavation, construction, etc., can solve the problems of groundwater infiltration into foundation pits, surface settlement, water level drop, etc., and achieve stability, good seepage resistance, and good stability Effect

Active Publication Date: 2020-12-22
北京市地质工程有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the excavation and protection of the foundation pit is completed, because there is a river on one side of the foundation pit, affected by the water storage of the river, the groundwater level rises above the bottom of the foundation pit, causing groundwater to seep into the foundation pit, making construction impossible
[0004] The existing method of dewatering foundation pits generally uses dewatering wells. However, since the strata around foundation pits are dominated by pebble layers, and the water level is affected by water storage in rivers, it is difficult to lower the water level through dewatering wells; It is easy to cause surface subsidence and affect the stability of surrounding buildings

Method used

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  • Construction method of anti-seepage system after foundation pit
  • Construction method of anti-seepage system after foundation pit
  • Construction method of anti-seepage system after foundation pit

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Embodiment 1

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] A construction method of an anti-seepage system after a foundation pit disclosed by the present invention comprises the following steps:

[0040] S1. The foundation pit has been supported by piles and anchors, and excavated to the bottom of the foundation pit.

[0041] S2, refer to figure 1 , on the side of the foundation pit facing the river and between the adjacent slope protection piles 1, the high-pressure jet spraying forms the jet jetting pile 2 that engages with the slope protection pile 1, and the jet jetting pile 2 and the slope protection pile 1 combine to form a curtain, and the bottom surface of the jet jetting pile 2 The elevation is the same as the elevation of the bottom surface of the slope protection pile 1, and the elevation of the top surface of the jet grouting pile 2 is higher than the highest water level of the groundwater, prefe...

Embodiment 2

[0050] refer to Figure 4 , the difference from Embodiment 1 is that in step S3, the gap between the slope protection pile 1, the jet grouting pile 2 and the anti-seepage wall 3 near the river channel is sealed. When making the guide wall 4 of the anti-seepage wall 3, the horizontal part 41 of the guide wall 4 close to the slope protection pile 1 is engaged with the slope protection pile 1 and the rotary grouting pile 2, and the thickness of the horizontal part 41 is thickened at the same time. The thickness of 41 is at least 1m, and the steel skeleton is set in the horizontal part 41 of the guide wall 4, and the position where the slope protection pile 1 and the rotary grouting pile 2 are engaged with the horizontal part 41 is chiseled, and then the template of the guide wall 4 is erected to conduct the guide wall. Pouring of wall 4. After the pouring of the guide wall 4 is completed and the formwork is removed, the construction of the anti-seepage wall 3 is carried out. Bet...

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Abstract

The invention relates to a foundation pit post seepage control system construction method, and relates to the technical field of foundation pit engineering. The foundation pit post seepage control system construction method comprises the following steps of S1, completing pile-anchor supporting of a foundation pit and completing excavating; S2, performing high pressure jet grouting between adjacentprotection slope piles of one side, close to a riverway, of the foundation pit to form a jet grouting pile which is engaged with the protection slope piles, wherein the bottom elevation of the jet grouting pile is the same as those of the protection slope piles, and the top elevation of the jet grouting pile is higher than the highest water level of underground water; and S3, constructing an enclosed cut-off wall along the outline of the foundation pit on one side, close to one side of the foundation pit, of each protection slope pile, wherein the bottom surface of the cut-off wall is embedded into a rock layer, the top elevation of the cut-off wall close to one side of the riverway is higher than the bottom elevation of the corresponding protection slope pile, and the top elevation of the rest of the cut-off wall is higher than the highest water level elevation of the underground water; and sealing the gaps between each of the protection slope piles as well as each of the jet grouting piles and the cut-off wall close to one side of the riverway. The foundation pit post seepage control system construction method has the advantages of good impermeability and low influence on the foundation pit and surrounding buildings.

Description

technical field [0001] The invention relates to the technical field of foundation pit engineering, in particular to a construction method for an anti-seepage system behind a foundation pit. Background technique [0002] The foundation pit is an earth pit excavated at the foundation design position according to the base elevation and foundation plane size. Before excavation, the excavation plan should be determined according to the geological and hydrological data, combined with the conditions of the nearby buildings, and the support, waterproof and drainage work should be done. [0003] At present, in a foundation pit project, in the geological survey and scheme design stage, the groundwater level is below the bottom of the foundation pit, the groundwater type is phreatic water, and the strata are mainly miscellaneous fill and pebble layers. In the scheme design stage, because the foundation pit is not affected by groundwater, only pile-anchor support is used as the protect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04E02D19/18E02D5/76E02D5/18
CPCE02D5/18E02D5/76E02D17/04E02D19/18E02D2250/0023
Inventor 沈元红
Owner 北京市地质工程有限责任公司