Construction method for high artesian area ultra-deep foundation pit

A construction method and technology of deep foundation pits, applied in infrastructure engineering, excavation, construction, etc., can solve problems such as large impact, slow sinking speed of bottom-sealed caissons, and difficult construction, so as to reduce engineering risks, protect the surrounding environment, The effect of saving engineering cost

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

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Problems solved by technology

The disadvantage of this method is that the depth of the water-proof curtain is large, especially when the confined water layer is thick and buried deep, the water-proof curtain is inserted into the deep bedrock, and the requirements for construction technology and construction machinery are very high. The construction is difficult, and the construction quality may not be guaranteed; the project cost is relatively high
[0005] The third method is the caisson method. There are caissons with closed bottom and unsealed caissons. The sinking speed of the closed caisson is relatively slow. If the closed caisson is used in ultra-deep foundation pits, the construction period will be longer
The disadvantage of this method is that in areas with high confined water head, it is very difficult to seal the bottom of the caisson w

Method used

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  • Construction method for high artesian area ultra-deep foundation pit
  • Construction method for high artesian area ultra-deep foundation pit

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Embodiment

[0025] Embodiment: In this embodiment, underground diaphragm walls (or bored piles, occlusal piles, and corresponding water-proof curtains) are used as the enclosure structure, and internal supports (steel supports or concrete supports) are used as the support structure. Under the premise of the safety factor of the confined water, the open excavation construction is carried out to a certain elevation (that is, the confined water layer is not depressurized or the confined water head is only slightly reduced). The upper side wall, 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 floor elevation of the underwater excavation and exceed Dig a certain depth for underwater bottom sealing concrete pouring, then pump out the water in the foundation pit, pour the bottom plate...

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Abstract

The invention relates to track traffic and tunnel categories, in specific to a super-deep foundation pit construction method for high pressure water areas. The method adopts underground continuous walls (or drilling piles, drill biting piles and corresponding waterproof curtains) as enclosure structures and inner supports as support structures; in the premises of complying with pressure water safety factor that is required in specifications, perform open excavation down to a certain elevation; during the course of open excavation method, carry out casting for surrounding purlins, supports and upper side walls; then, add water into the foundation pit, and the water injection height should guarantee the excavation to the bottom can resist pressure water and meet certain safety factors; perform underwater excavation down to the baseplate elevation and overbreak a certain depth for underwater bottom closing concrete cast; then, pump water out of the foundation pit before casting baseplate and back-casting remaining internal structures.

Description

technical field [0001] The invention relates to rail transit and tunnels, in particular to a construction method for ultra-deep foundation pits in areas with high confined water. Background technique [0002] In the prior art, the design and construction methods for tunnel working wells and intermediate air well foundation pits in confined water areas are as follows: [0003] The first is the top-down method of open-cut open-cut frame with reduced pressure. The design idea of ​​this method is: use the underground diaphragm wall (or bored pile, occlusal pile and corresponding water-proof curtain) as the enclosure structure, and the internal support (steel support or concrete support) as the support structure, after the enclosure structure is completed, the confined water construction in the foundation pit will be carried out first, and the foundation pit excavation will be carried out after the pressure water head drops to the design required level, and the internal support w...

Claims

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Application Information

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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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