Subway sand layer open cut pit construction method

A construction method and technology of subway sand, which are applied in excavation, infrastructure engineering, construction, etc., can solve the problems of foundation pit safety risks, affect construction progress, and fail to form a bearing layer, so as to ensure stability and pull-out resistance, Good economic benefits and the effect of ensuring safety factor

Inactive Publication Date: 2018-10-02
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] my country is currently in the peak period of subway construction, and the construction methods of subway open-cut stations are relatively mature, especially in general strata, the earthwork excavation process is relatively simple, but for soft and water-rich sand layers, traditional constru...

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  • Subway sand layer open cut pit construction method
  • Subway sand layer open cut pit construction method

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specific Embodiment approach

[0028] A method for constructing an open excavation foundation pit in a subway sand layer, specifically comprising the following steps:

[0029] 1) Closed construction of the underground diaphragm wall along the periphery of the foundation pit: After measuring and positioning, excavate the trench for the underground diaphragm wall with a groove forming machine, put the processed steel cage into the excavated groove and pour concrete.

[0030] 2) Construction of dewatering wells in the foundation pit: the tube well point dewatering system is used for pumping and dewatering. The depth of the dewatering well is at the position 2m below the structural floor 11 to ensure that the water surface is lower than the structural floor 11, and blind ditches are excavated around the bottom of the pit. All the water in the ditch flows into the interior of the precipitation well, and then is discharged from the precipitation well.

[0031] 3) Construction of observation well 6 outside the fou...

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Abstract

The invention relates to the field of municipal rail traffic construction, and especially relates to a subway sand layer open cut pit construction method. The subway sand layer open cut pit construction method comprises the following steps: underground diaphragm wall, high pressure jet grouting water-head pile, three-axis mixing pile, foundation uplift pile, underground draining well, observationwell outside a pit, earth excavation, steel shotcrete erection, substrate treatment, waterproof construction, and structure construction. Through the underground diaphragm wall and steel shotcrete, aclosed integrated is formed, and foundation pit water leakage effect is greatly improved. The method ensures smooth construction of a subway foundation pit in a narrow space region in a city. Using the open cut pit method, subway open-cut station construction is safer and more efficient.

Description

technical field [0001] The invention relates to the field of municipal rail transit construction, in particular to a method for constructing an open-cut foundation pit in a subway sand layer. Background technique [0002] my country is currently in the peak period of subway construction, and the construction method of subway open-cut stations has been relatively mature, especially in general strata, the earthwork excavation process is relatively simple, but for weak water-rich sand layers, the traditional construction method is difficult to carry out, sand The soil in the layer is soft and cannot form a bearing layer. If a tiny detail is not handled properly, water gushing and sand gushing may occur. Not only will it affect the construction progress, but also there is a great risk to the safety of the foundation pit. Contents of the invention [0003] The invention provides an open-cut foundation pit construction method for a subway sand layer in order to carry out earthwo...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D19/10
CPCE02D17/02E02D19/10
Inventor 李宏飞王志强李五红赵香萍李晓曹竣
Owner CHINA RAILWAY 12TH BUREAU GRP
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