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Construction method of foundation pit above tunnel

A foundation pit and tunnel technology, applied in construction, excavation, foundation structure engineering, etc., can solve the problems of low overall strength and stability of the foundation pit structure, to ensure stability and strength, improve safety, and take into account practicality and beautiful effect

Inactive Publication Date: 2019-04-12
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, the overall strength and stability of the entire foundation pit structure are not high

Method used

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  • Construction method of foundation pit above tunnel

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Embodiment Construction

[0028] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0029] The invention provides a method for constructing a foundation pit above a tunnel. First, steel cylinders 9 are respectively drilled at the design boundaries on both sides of the bottom surface of the tunnel foundation pit, comprising the following steps: S1, excavating gravel and soil in the steel cylinder 9 out, and then bind the supporting steel bars in the steel cylinder 9, the upper end of the supporting steel bars is higher than the bottom surface of the tunnel foundation pit; S2, the upper end of the supporting steel bars is bound to the retaining wall steel bars, and the retaining wall steel bars are used to support the formwork and p...

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Abstract

The invention discloses a construction method of a foundation pit above a tunnel. The construction method of the foundation pit above the tunnel comprises the steps that firstly, steel cylinders are separately arranged at the design boundaries on both sides of the bottom surface of the tunnel foundation pit in a drilling mode, and gravel soil in the steel cylinders is dug out; then supporting steel bars are tied in the steel cylinders, the bottom surface of the tunnel foundation pit is higher than the height of the upper end of the supporting steel bars, and retaining wall steel bars are subjected to formwork supporting and C50 concrete is poured into the retaining wall bars to form C50 concrete retaining walls; and tunnel walls are constructed between the two groups of C50 concrete retaining walls, full steel bars are laid on the bottom surface of the tunnel foundation pit and the slope surfaces, and shortcreting is carried out to form a foundation pit water proof surface. Compared with a construction method of an underground open cut tunnel in the prior art, the construction method of the foundation pit above the tunnel is more economical and durable, can ensure the stability andstrength of the tunnel foundation pit to a great extent, improves the safety of tunnel use, and takes practicability and attractiveness into account at the same time.

Description

technical field [0001] The invention relates to the technical field of tunnel foundation pit construction, and more specifically relates to a method for constructing foundation pits above tunnels. Background technique [0002] When the buried depth of the tunnel is shallow and the overlying rock and soil mass is thin, and it is difficult to use the underground excavation method, the open excavation method should be used to excavate the tunnel. The tunnel structure built by the open cut method is called open hole. It is more common in the entrance and exit sections of mountainous railways and road tunnels, or the subway interval tunnels in cities in plain areas, as well as the entrance and exit sections of road tunnels and cross-river tunnels. The choice of open tunnel construction method should be determined according to factors such as terrain, geological conditions and structural form. Moreover, there are many construction procedures of underground open holes in the prio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/045E02D17/04E02D29/02E02D15/04
CPCE02D15/04E02D17/04E02D29/0275E02D29/045
Inventor 孙华圣陈沈威董云陈亚东张继华陈家瑞
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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