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Foundation pit graded depressurization method

A technology of graded depressurization and foundation pit, applied in the direction of infrastructure engineering, construction, etc., can solve the problems of leakage, poor water head under pressure in the seventh layer, weak excavation construction of the foundation pit enclosure, etc., to reduce the water head. Poor, construction safety assurance, the effect of increasing the safety factor

Inactive Publication Date: 2020-12-11
NO 2 CONSTR GRP CO LTD OF SHANGHAI CONSTR GRP
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Problems solved by technology

[0002] With the development of urban underground space, the depth of underground space is getting deeper and deeper. Some underground structures have entered the underground ⑦ confined water layer, but there are no good countermeasures for the underground diaphragm wall as the enclosure structure. Leakage problems are inevitable during the construction process, mainly due to the huge difference in the pressured water head of layer ⑦, the weak points of the foundation pit enclosure structure and the subsequent excavation construction will face great risks

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  • Foundation pit graded depressurization method

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Embodiment Construction

[0025] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Such as figure 1 As shown, the present invention provides a step-by-step depressurization method for foundation pits, comprising:

[0027] Step S1, setting the pressure-reducing well 1 in the pit in the area 2 to be excavated;

[0028] Step S2, setting a ground wall 3 outside the area to be excavated 2, wherein the ground wall is inserted into the ninth confined water layer;

[0029] Step S3, setting a water-stop curtain 4 outside the ground wall 3, wherein the water-stop curtain is inserted into the seventh confined water layer;

[0030] Step S4, setting a decompression well outside the pit between the ground wall 3 and the water-stop curtain 4;

[0031] Step S5, by opening the decompression well 1 inside the pit and th...

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Abstract

The invention provides a foundation pit graded depressurization method. After depressurization is performed through a first-stage pit exterior depressurization well between a ground wall and an adjacent waterproof curtain of the ground wall, a first-stage confined water head and a second-stage confined water head, which is in a to-be-excavated area, are obtained in an area surrounded by the groundwall and the adjacent waterproof curtain; and therefore, the height difference between the second-stage confined water head in the to-be-excavated area and the first-stage confined water head is reduced, so that the pressure of the ground wall is reduced. According to the foundation pit graded depressurization method, the difference between confined water heads inside and outside the pit can be reduced, and an enclosure structure of an ultra-deep foundation pit is protected; the leakage risk of the ultra-deep foundation pit is reduced; And the safety coefficient of construction operation in the foundation pit is increased. According to the foundation pit graded depressurization method, the depressurization range can be effectively controlled, controllable settlement in each depressurization area is guaranteed, the difference between the water heads inside and outside the foundation pit ground wall is reduced, and the construction safety of the deep foundation pit is effectively guaranteed.

Description

technical field [0001] The invention relates to a step-by-step depressurization method for foundation pits. Background technique [0002] With the development of urban underground space, the depth of underground space is getting deeper and deeper. Some underground structures have entered the underground ⑦ confined water layer, but there are no good countermeasures for the underground diaphragm wall as the enclosure structure. Leakage problems are inevitable during the construction process, mainly due to the huge head difference of the ⑦ layer of confined water. The weak points of the foundation pit enclosure structure and the subsequent excavation construction will face great risks. Contents of the invention [0003] The purpose of the present invention is to provide a step-by-step depressurization method for foundation pits. [0004] In order to solve the above problems, the present invention provides a step-by-step depressurization method for foundation pits, including:...

Claims

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Application Information

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IPC IPC(8): E02D19/18E02D19/06E02D19/10
CPCE02D19/06E02D19/10E02D19/18
Inventor 陈荣潘国庆
Owner NO 2 CONSTR GRP CO LTD OF SHANGHAI CONSTR GRP
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