Setting arrangement for high artesian area ultra-deep foundation pit

A high-pressure, deep foundation pit technology, applied in infrastructure engineering, excavation, construction, etc., can solve the problems of difficult to meet the requirements of construction accuracy, large impact, etc., to protect the surrounding environment, reduce engineering risks, and save engineering costs. Effect

Inactive Publication Date: 2008-03-12
SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of structural form, this setting structure can be applied to deep foundation pit projects in areas with high confined water, but it has a relatively large impact on the surrounding environment during the construction process, and in projects with high precision requirements, its construction accuracy difficult to meet

Method used

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  • Setting arrangement for high artesian area ultra-deep foundation pit
  • Setting arrangement for high artesian area ultra-deep foundation pit
  • Setting arrangement for high artesian area ultra-deep foundation pit

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Experimental program
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Embodiment

[0028] Embodiment: In this embodiment, the underground diaphragm wall (or bored pile, occlusal pile) is used as the enclosure structure, and the internal support (steel support or concrete support) is used as the support structure. Under the premise of open excavation construction to a certain elevation (that is, no depressurization treatment for the confined water layer or only slightly lowering the confined water head), during the excavation process of the open cut method, the purlins, supports and upper side walls are poured, and then Inject water into the foundation pit (the height of the water head is based on the fact that the excavation to the bottom of the pit can resist the pressurized water and meet a certain safety factor), and carry out underwater excavation construction. The bottom cover concrete is poured, and then the water in the foundation pit is pumped out, the bottom plate is poured and the remaining internal structure is built back.

[0029] The structure o...

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PUM

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Abstract

The invention relates to track traffic and tunnel categories, in specific to an arrangement structure of superdeep foundation pits in high pressure water areas; the structure adopts underground continuous walls (or drilling piles, drill biting piles and corresponding waterproof curtains) as enclosure structure, and inner supports (steel supports or concrete supports ) as support structures; during the course of foundation pit excavation, perform reverse execution on surrounding purlins, supports and side walls; through placing precast concrete beams or steel beams in seal concrete, the invention solves shortcomings in prior arts; the invention mainly has the following advantages: On one hand, the invention can avoid the diffuculty in penetration in execution of enclosure structure (in particular to waterproof curtains) when confined aquifers are rather thick and deep; on the other hand, the invention can also avoid all kinds of difficulties in pressure drop of pressure water. Therefore, the invention can save construction cost and lower construction risk at the same time of well protecting surrounding environments.

Description

technical field [0001] The invention relates to rail transit and tunnels, in particular to an arrangement structure for ultra-deep foundation pits in areas with high confined water. Background technique [0002] In the prior art, there are the following configurations for tunnel working wells and intermediate air well foundation pits in confined water areas: [0003] When adopting the top-down construction of the pressure-reducing water open cut frame, the structure is set as follows: the underground diaphragm wall (or bored piles, occlusal piles and corresponding water-proof curtains) is used as the enclosure structure, and the internal support (steel support or concrete support) As a supporting structure, purlins and supports are reversed during the excavation of the foundation pit. After the foundation pit is excavated to the bottom of the pit, the structural floor is poured and then the structural side walls and structural floors of each floor are built back. The disadv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02
Inventor 曹文宏曹伟飚叶蓉管攀峰肖勤孙建军
Owner SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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