Soft soil stratum subway station expansion method and structure based on inserted beam freezing method

A technology of subway station and freezing method, which is applied to earth-moving drilling, underground chamber, wellbore lining, etc., can solve the problems of subway and surrounding soil deformation, short division of shield construction sections, and damage of existing subways. Achieve the effect of short engineering period, good deformation control effect and high construction efficiency

Active Publication Date: 2020-06-19
SHIJIAZHUANG TIEDAO UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, problems such as too short division of shield construction sections, low utilization rate of equipment, and long waiting time for shield machines have restricted the development and application of shield technology in my country. One of the main reasons for these problems is that there is no good Solve the contradiction between the construction of the shield section and the construction of the station in terms of construction speed and organization
[0003] Chinese patent ZL201310468894.2 discloses a construction method for the expansion of the main structure of the existing subway station, which mainly uses a plurality of dewatering well pipes to carry out dewatering construction until the groundwater under the floor is reduced to the design depth. In the widening construction, the underground enclosure structure is supported by the force conversion method of slabs instead of braces. However, this expansion method seriously breaks the ground, which will cause large deformation of the subway and the surrounding soil, and may even cause stratum subsidence and existing Sabotage of operating subways, resulting in major safety incidents

Method used

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  • Soft soil stratum subway station expansion method and structure based on inserted beam freezing method
  • Soft soil stratum subway station expansion method and structure based on inserted beam freezing method
  • Soft soil stratum subway station expansion method and structure based on inserted beam freezing method

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Embodiment 1

[0043] Such as figure 1 As shown, the subway and station expansion structure of this embodiment include shield tunnels, intermediate platforms connected between two parallel shield tunnels and communicated with the shield tunnels, and frozen soil layers 16 wrapped outside the intermediate platforms.

[0044]Among them, the intermediate platform includes a top lining unit and a bottom lining unit, side columns and a structural floor. The top lining unit and the bottom lining unit are arranged between the shield tunnels and are symmetrical up and down. The frozen soil layer 16 is along the top lining unit and the bottom lining unit. The arched outer surface is laid out. Both the top lining unit and the bottom lining unit include curved casing layers distributed at intervals on the outer side, a waterproof layer and station lining 14 sequentially arranged inside the curved casing layers. The curved casing layer is composed of multi-section seamless curved casings 6 with a length...

Embodiment 2

[0057] The subway of present embodiment, station extension structure are identical with embodiment 1.

[0058] The subway and station expansion method based on the casing concrete beam insertion method of the present embodiment are specifically realized by the following steps:

[0059] The extension structure of the above-mentioned subway and station is constructed by the following method of extending the subway station on soft ground based on the method of inserting and freezing beams, and it is specifically realized by the following steps:

[0060] 1) Upper and lower perforations 1 are respectively set on the relative positions of the shield segments of the two parallel shield tunnels. The diameter of the perforation 1 is larger than the diameter of the curved sleeve 6 ± 3mm, so that the curved sleeve 6 can be pushed smoothly.

[0061] 2) Set up the reaction force frame 2 in the shield tunnel on both sides, fix the reaction force support 3 and the guide frame 5 on the reacti...

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Abstract

The invention provides a soft soil stratum subway station expansion method and structure based on an inserted beam freezing method. The soft soil stratum subway station expansion structure comprises shield tunnels, a middle platform connected between the two parallel shield tunnels and communicating with the shield tunnels, and frozen soil layers wrapping the outer side of the middle platform; themiddle platform comprises a top lining unit, a bottom lining unit, side columns and a structural bottom plate, the top lining unit and the bottom lining unit are arranged between the shield tunnels and are symmetrical up and down, and the frozen soil layers are distributed along the arched outer surfaces of the top lining unit and the bottom lining unit; the two side ends of the bottom lining unit and the two side ends of the top lining unit are connected and supported through the side columns; and the structural bottom plate is arranged above the bottom lining unit and is kept on the same horizontal plane with the two ends of the bottom lining unit. The method solves the problem of large deformation of subways and surrounding soil caused by serious soil moving in an expansion mode, and has the advantages of being high in construction efficiency, short in construction period and high in safety.

Description

technical field [0001] The invention belongs to the technical field of geotechnical construction, and in particular relates to a method and structure for expanding a subway station on soft ground based on a beam-inserting freezing method. Background technique [0002] The shield tunneling method has become an important construction method in the construction of subways in my country, and has become a preferred method. However, problems such as too short division of shield construction sections, low utilization rate of equipment, and long waiting time for shield machines have restricted the development and application of shield technology in my country. One of the main reasons for these problems is that there is no good Solve the contradiction between the construction of the shield section and the construction of the station in terms of construction speed and organization. [0003] Chinese patent ZL201310468894.2 discloses a construction method for the expansion of the main s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/01E21D11/18E21D11/38E21D11/10
CPCE21D9/001E21D11/105E21D11/18E21D11/38E21D9/01
Inventor 胡指南孙明磊刘志春申瑾林攀黄双林杜孔泽李新志王飞王煦霖
Owner SHIJIAZHUANG TIEDAO UNIV
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