A subway station auxiliary structure and construction technology thereof

Abstract

The present invention discloses an auxiliary structure of a subway station, characterized in that it comprises a pipe jacking machine shell (6), a secondary lining (7) in the shell, a dark excavation part, an auxiliary structure pipe jacking part (4) and an auxiliary structure open excavation part (3); one end of the dark excavation part is connected to a station body (1), and the other end is connected to the secondary lining (7) in the shell; the pipe jacking machine shell (6) is connected to the auxiliary structure pipe jacking part (4); the auxiliary structure pipe jacking part (4) is connected to the auxiliary structure open excavation part (3); and the pipe jacking machine shell (6) is coated on the outer surface of the secondary lining (7) in the shell.

Description

Technical Field

[0001] The present invention relates to the technical field of subway station construction, and in particular to a pipe jacking construction process for ancillary structures of a subway station. Background Art

[0002] With the continuous development of the national economy and the continuous acceleration of my country's urbanization process, the construction of municipal engineering and the development and utilization of underground structures have received attention from relevant units. The construction of subway station entrance and exit passages across intersections often faces the problem of interrupting traffic and fencing roads. Under traditional technology, when implementing underground stations, it is generally necessary to reserve entrance and exit connection conditions in the main structure of the station. After the main structure of the station is completed, the road traffic diversion and pipeline relocation are carried out, and the entrance and exit passages are constructed by open excavation. When implementing underground structures in busy urban traffic sections or streets with dense underground pipelines, it has a great impact on ground traffic and underground pipelines, which will affect the feasibility of the entire plan. Therefore, in order to better implement the entrance and exit passages across intersections of underground stations, it is urgent to solve the problem of not having the ability to set up a top pipe hoisting well on site without affecting ground traffic or relocating pipelines. Summary of the invention

[0003] The technical problem to be solved by the present invention is: to provide a construction process of the auxiliary structure of a subway station by a jacking method. On the premise of meeting the use function of the underground station, a structural system consisting of a primary lining of a dark excavation section of the auxiliary structure, an open excavation part of the auxiliary structure, a jacking part of the auxiliary structure, a secondary lining of the dark excavation section of the auxiliary structure, an outer shell of a jacking machine and a secondary lining inside the shell is used. It can not affect ground traffic, does not relocate pipelines, and can also solve the problem that there is no jacking well available on site.

[0004] The technical solution of the present invention is: a subway station auxiliary structure, including a pipe jacking machine shell, a secondary lining in the shell, a dark excavation part, a pipe jacking part of the auxiliary structure and an open excavation part of the auxiliary structure; one end of the dark excavation part is connected to the station body, and the other end is connected to the secondary lining in the shell, the pipe jacking machine shell is connected to the pipe jacking part of the auxiliary structure; the pipe jacking part of the auxiliary structure is connected to the open excavation part of the auxiliary structure, and the pipe jacking machine shell is coated on the outer surface of the secondary lining in the shell.

[0005] The dark excavation part includes the primary lining of the dark excavation section of the auxiliary structure and the secondary lining of the dark excavation section of the construction auxiliary structure.

[0006] The primary lining of the dark excavation section of the auxiliary structure adopts steel frame and shotcrete.

[0007] The second lining in the shell is a reinforced concrete structure.

[0008] The first installation process is to reserve steel bar connectors and embed steel plate water stop strips, and the second installation process is to use curtain rubber sheets and flaps.

[0009] The open excavation part of the auxiliary structure is provided with a jacking pipe hanging hole.

[0010] The construction process of the auxiliary structure of a subway station is as follows: first, the open excavation part of the auxiliary structure and the jacking pipe hanging hole are constructed; after the starting conditions for jacking are met, the jacking machine is hung in, and the jacking pipe segments are sequentially pushed forward and spliced; after jacking to the designated position, the primary lining of the dark excavation section of the auxiliary structure is started from the main body of the station; after the hole is connected, the cutter head and internal equipment of the jacking machine are dragged out, and the outer shell of the jacking machine is left in place; the secondary lining of the dark excavation section of the auxiliary structure and the secondary lining inside the shell are constructed, and the side wall reconstruction and opening are completed.

[0011] Beneficial effects of the invention: The invention can meet the requirements of not interrupting road traffic and not relocating pipelines, thereby saving construction time and engineering investment. The invention provides a new structural system for the entrance and exit passages set across the intersection, especially when the conditions for lifting the top pipe are not met.

[0012] The structural system formed by the primary lining of the auxiliary structure's dark excavation section, the auxiliary structure's open excavation part, the auxiliary structure's jacking pipe part, the secondary lining of the auxiliary structure's dark excavation section, the jacking machine's outer shell and the secondary lining inside the shell provides a new construction process for sites that do not have the conditions for ground traffic relief and pipeline relocation, especially for sites that do not have the conditions for setting up a jacking pipe hoisting well, thereby saving construction time and investment.

[0013] The present invention is composed of the primary lining of the auxiliary structure dark excavation section, the open excavation part of the auxiliary structure, the jacking part of the auxiliary structure, the secondary lining of the dark excavation section of the auxiliary structure, the outer shell of the jacking machine and the secondary lining structure inside the shell. During the construction of the auxiliary structure of the underground station, the jacking machine is hoisted in from the open section of the entrance and exit passage, and the part of the auxiliary structure crossing the municipal road is constructed by the jacking method, which can avoid the impact of the traditional open excavation construction method on road traffic and underground pipelines; the jacking machine adopts the shelling method, which can effectively solve the problem that the jacking well cannot be set up; the main structure of the station and the auxiliary interface connection section are constructed by the dark excavation method, and the inner core part of the jacking machine can enter the main structure of the station through the primary lining structure of the auxiliary structure, and then be hoisted out. The construction process of this scheme overcomes the problem that the open excavation method construction of underground cross-intersection structures requires traffic diversion and relocation of municipal pipelines under the traditional process, and also overcomes the problem that the hoisting well must be set up for the jacking method construction, saving construction time and investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall schematic diagram of the structural system of the present invention during the construction stage;

[0015] Figure 2 It is the longitudinal section drawing of the structural system during construction;

[0016] Figure 3 It is a schematic diagram of the pipe jacking segment structure;

[0017] In the figure, 1-main structure of the station, 2-primary lining of the dark excavation section of the auxiliary structure, 3-open excavation part of the auxiliary structure, 4-jacking pipe part of the auxiliary structure, 5-secondary lining of the dark excavation section of the auxiliary structure, 6-jacking machine shell, 7-secondary lining inside the shell, 8-jacking pipe hanging hole, 9-boundary between jacking pipe segment and open excavation, 10-boundary between jacking pipe segment and dark excavation secondary lining, 11-jacking pipe segment, 12-ground. DETAILED DESCRIPTION

[0018] like Figure 1-3 As shown, a subway station auxiliary structure includes a pipe jacking machine shell 6, a secondary lining 7 in the shell, a dark excavation part, a pipe jacking part 4 of the auxiliary structure and an open excavation part 3 of the auxiliary structure; one end of the dark excavation part is connected to the station body 1, and the other end is connected to the secondary lining 7 in the shell, the pipe jacking machine shell 6 is connected to the pipe jacking part 4 of the auxiliary structure; the pipe jacking part 4 of the auxiliary structure is connected to the open excavation part 3 of the auxiliary structure, and the pipe jacking machine shell 6 is coated on the outer surface of the secondary lining 7 in the shell.

[0019] Specifically, the main load-bearing components of the auxiliary structure include a concealed excavation part, a secondary lining 7 inside the shell, a top pipe part 4 of the auxiliary structure and an open excavation part 3 of the auxiliary structure, wherein the concealed excavation part includes a primary lining 2 of the concealed excavation section of the auxiliary structure and a secondary lining 5 of the concealed excavation section of the construction auxiliary structure.

[0020] Specifically, in practical applications, the primary lining 2 of the dark excavation section of the auxiliary structure can be composed of a steel frame and shotcrete, which has high strength, good rigidity, high stability and good durability.

[0021] Specifically, in practical applications, the second lining 7 in the shell is a reinforced concrete structure, which has the advantages of high rigidity and good stability.

[0022] In actual projects, the first installation process is to reserve steel bar connectors and embed steel plate waterstops, and the second installation process is curtain rubber sheets and flaps.

[0023] The first practical operation steps: Step 1: construct the open cut part 3 of the auxiliary structure and the primary lining 2 of the auxiliary dark cut section, and the two parts are constructed simultaneously. After the open cut part 3 of the auxiliary structure reaches the design strength, the jacking pipe is hoisted into the open cut part through the hoisting hole 8 and the jacking machine is assembled;

[0024] Step 2: After the pipe jacking machine is assembled, the pipe jacking work is started. After exiting the hole, the auxiliary structure pipe jacking part 4 is applied. The auxiliary structure pipe jacking part 4 is composed of pipe jacking segments 11 until the pipe jacking cutter head enters the dark excavation part of the auxiliary structure;

[0025] Step 3: After the tunnel is through, remove the cutter head and internal equipment of the pipe jacking machine, leave the outer shell 6 of the pipe jacking machine in place, construct the secondary lining 5 of the dark excavation section of the auxiliary structure and the secondary lining 7 inside the shell, and complete the side wall renovation and opening.

[0026] The second operation step: When using this solution, first construct the open excavation part 3 of the auxiliary structure and the jacking pipe hanging hole 8 according to the functional needs. After the jacking starting conditions are met, the jacking machine is hung in, and the jacking pipe segments 11 are sequentially pushed forward and spliced. The jacking pipe segments 11 constitute the jacking part 4 of the auxiliary structure. After jacking to the designated position, the auxiliary structure dark excavation section primary lining 2 is constructed from the station main structure 1. After the hole is through, the jacking machine cutter head and internal equipment are dragged out, and the jacking machine shell 6 is left in place. The auxiliary structure dark excavation section secondary lining 5 and the shell secondary lining 7 are constructed. After the side wall modification and opening are completed, the inner core of the jacking machine is detached from its shell, and it moves through the auxiliary structure dark excavation section primary lining 2 to the station main structure 1 and then is hung out. It can be seen that this solution has a simple structure and is easy to construct. It provides a new construction process for sites that do not have the conditions for ground traffic relief and pipeline relocation, especially for sites that do not have the conditions for setting up a jacking pipe hanging well, saving construction time and investment.

[0027] Through the jacking construction process of the subway station auxiliary structure in the present invention, a structural system consisting of the primary lining of the auxiliary structure dark excavation section, the auxiliary structure open excavation part, the jacking part of the auxiliary structure, the secondary lining of the auxiliary structure dark excavation section, the outer shell of the jacking machine and the secondary lining inside the shell is used. It can avoid affecting ground traffic and relocating pipelines, and can also solve the problem that there is no jacking well available on site, thereby reducing the project cost and saving investment.

[0028] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A subway station auxiliary structure, characterized in that: It comprises a pipe jacking machine shell (6), a secondary lining (7) in the shell, a dark excavation part, a pipe jacking part of an auxiliary structure (4) and an open excavation part (3) of the auxiliary structure; one end of the dark excavation part is connected to the station body (1), and the other end is connected to the secondary lining (7) in the shell; the pipe jacking machine shell (6) is connected to the pipe jacking part (4) of the auxiliary structure; the pipe jacking part (4) of the auxiliary structure is connected to the open excavation part (3); the pipe jacking machine shell (6) is coated on the outer surface of the secondary lining (7) in the shell; the dark excavation part comprises a primary lining (2) of the dark excavation section of the auxiliary structure and a secondary lining (5) of the dark excavation section of the construction auxiliary structure; the open excavation part (3) of the auxiliary structure is provided with a pipe jacking entry hole (8); The construction process of the auxiliary structure of the subway station is as follows: first, the open excavation part (3) of the auxiliary structure and the jacking pipe hanging hole (8) are constructed. After the starting conditions for jacking are met, the jacking machine is hoisted in, and the jacking pipe segments (11) are spliced ​​in sequence. After jacking to the designated position, the primary lining (2) of the dark excavation section of the auxiliary structure is constructed from the station body (1). After the hole is connected, the cutter head and internal equipment of the jacking machine are pulled out, and the outer shell (6) of the jacking machine is left in place. The secondary lining (5) of the dark excavation section of the auxiliary structure and the secondary lining (7) inside the shell are constructed, and the side wall reconstruction hole is completed.

2. A subway station auxiliary structure according to claim 1, characterized in that: The primary lining (2) of the auxiliary structure dark excavation section adopts a steel frame and shotcrete.

3. A subway station auxiliary structure according to claim 1, characterized in that: The secondary lining (7) inside the shell is a reinforced concrete structure.

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