Open cut subway station local horizontal extension structure and construction method

Abstract

The invention discloses an open-cut subway station local horizontal extension structure and a construction method, and the construction method comprises the following steps: S1, completing open-cut main body structure construction of a station according to a station open-cut construction process; s2, during open cut main body structure construction, a temporary stand column, a temporary concrete wall and a first steel reinforced concrete joist are arranged at the joint position of a preset underground cut extension area and the open cut main body structure, and structural stress conversion during horizontal extension is achieved; s3, after the open-cut main body structure of the station reaches the design strength and advanced reinforcement measure construction is completed, door openings are broken in the two ends of the underground-cut extension area, excavation is conducted oppositely, a certain length is reserved in the middle of the underground-cut extension area for one-way penetration, and construction of the underground-cut extension area is completed; and S4, secondary lining construction of the underground excavation extension area is carried out. The open excavation method can be adopted for construction at the position with small influence on the surrounding environment, so that the influence on the surrounding environment can be effectively reduced, the limited underground space can be better utilized, and the construction progress is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and more particularly to a local horizontal expansion structure of an open-cut subway station and a construction method thereof. Background Art

[0002] In the prior art, subway station construction is carried out by open excavation or dark excavation. However, with the rapid development of cities, the surrounding environment of subway station construction is becoming more and more complex. For complex construction environments, it is impossible to implement all open excavation methods, while dark excavation methods have the disadvantages of high construction risks, long construction period, and high cost.

[0003] Therefore, how to provide a partial horizontal expansion structure and construction method for an open-cut subway station that can reduce the impact on the surrounding environment and improve construction efficiency is one of the technical problems that urgently need to be solved in this field. Summary of the invention

[0004] In view of this, the present invention provides a partial horizontal expansion structure and construction method of an open-cut subway station, the purpose of which is to solve the problems in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A local horizontal expansion structure of an open-cut subway station comprises: an open-cut area and a dark-cut expansion area located on one side of the open-cut area; the open-cut area is provided with an open-cut main structure; a temporary concrete wall and temporary columns are provided at the interface between the open-cut area and the dark-cut expansion area; a first steel-concrete joist is provided at the top of the temporary concrete wall; the first steel-concrete joist is connected to the open-cut main structure of the open-cut area.

[0007] Preferably, a wall longitudinal beam is provided at the top end of the first steel-concrete supporting beam.

[0008] Preferably, a top plate transverse beam is provided at the top end of the longitudinal beam under the wall.

[0009] Preferably, the first steel concrete joist is connected to the open cut main structure via a second steel concrete joist.

[0010] A construction method for a local horizontal expansion structure of an open-cut subway station, characterized by comprising the following steps:

[0011] S1: Complete the open-cut main structure construction of the station according to the open-cut construction technology of the station;

[0012] S2: During the construction of the open-cut main structure, temporary columns, temporary concrete walls and the first type of steel concrete joists are set at the interface between the preset dark excavation expansion area and the open-cut main structure to achieve structural force conversion during horizontal expansion;

[0013] S3: When the main open-cut structure of the station reaches the designed strength and the advanced reinforcement measures are completed, the door openings are removed at both ends of the dark-cut expansion area, and excavation is carried out in opposite directions with a certain length of one-way penetration reserved in the middle to complete the construction of the dark-cut expansion area;

[0014] S4: Carry out secondary lining construction in the dark excavation expansion area.

[0015] Preferably, the specific construction method of S2 is: construct open excavation foundation pit - construct station floor - construct temporary columns and temporary concrete walls - construct replacement beams at the open and dark excavation interface - construct side walls and each floor slab - remove the retaining piles at the open and dark excavation interface.

[0016] Preferably, the open-cut and concealed-cut interface replacement beam includes a first-type steel-concrete support beam and a second-type steel-concrete support beam; the first-type steel-concrete support beam is arranged at the top of the temporary concrete wall; the first-type steel-concrete support beam is connected to the open-cut main structure through the second-type steel-concrete detachment.

[0017] Preferably, the specific construction method of S3 is: excavating the upper step of the horse head gate - erecting a steel frame - installing locking feet - erecting temporary cross braces - longitudinally excavating from one end of the dark excavation expansion area to a certain distance, and temporarily closing the heading face - excavating the middle step according to the excavation sequence of the upper step - excavating to the end and sealing the end - then excavating the lower step until the entire section is closed into a ring, and the remaining area to be expanded is excavated from the other end of the dark excavation expansion area until it is connected.

[0018] Preferably, in said S4, the secondary lining construction comprises the following steps: S41, cutting off the lower temporary concrete wall and steel frame, and constructing the bottom plate; S42, removing the temporary cross braces step by step, and constructing the inner wall and top plate of the channel to form a whole; S43, removing the temporary columns and temporary concrete walls.

[0019] Preferably, the dark excavation section is a flat-top straight wall.

[0020] Compared with the prior art, the present invention has achieved the following technical effects: by adopting the method of local horizontal expansion and longitudinal excavation, the present invention can adopt open excavation construction in locations with less impact on the surrounding environment, thereby effectively reducing the impact on the surrounding environment, and can better utilize limited underground space and speed up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an end view of a partial horizontal expansion structure of an open-cut subway station according to the present invention;

[0022] Figure 2 This is a schematic diagram of the longitudinal excavation during the expansion construction of the dark excavation area;

[0023] Figure 3 This is the longitudinal excavation construction sequence diagram for the expansion construction of the dark excavation area;

[0024] Figure 4 - Figure 6 This is the second lining construction step diagram;

[0025] In the figure: 1. Main structure of open excavation; 2. Temporary concrete wall; 3. First type steel concrete joist; 4. Longitudinal beam under the wall; 5. Second type steel concrete joist; 6. Horizontal beam of top plate; 7. Upper step; 8. Steel frame; 9. Temporary cross brace; 10. Middle step; 11. Lower step. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The present invention provides a local horizontal expansion structure of an open-cut subway station, comprising: an open-cut area and a dark-cut expansion area located on one side of the open-cut area; the open-cut area is provided with an open-cut main structure 1; a temporary concrete wall 2 and a temporary column are provided at the interface between the open-cut area and the dark-cut expansion area; a first-type steel-concrete joist 3 is provided at the top of the temporary concrete wall 2; the first-type steel-concrete joist 3 is connected to the open-cut main structure 1 of the open-cut area; by arranging the temporary concrete wall 2, the temporary column and the first-type steel-concrete joist 3 at the interface between the open-cut area and the dark-cut expansion area, structural force conversion during subsequent horizontal expansion can be achieved.

[0028] In this embodiment, a wall longitudinal beam 4 is provided at the top end of the first steel concrete support beam 3 .

[0029] In this embodiment, a top plate transverse beam 6 is provided at the top end of the longitudinal beam 4 under the wall.

[0030] In this embodiment, the first steel concrete joist 3 is connected to the open cut main structure 1 through the second steel concrete joist 5 .

[0031] In this embodiment, the dark excavation expansion area is provided with temporary cross braces 9 and steel frames 8 for temporarily supporting the dark excavation expansion area.

[0032] The present invention also provides a construction method for a local horizontal expansion structure of an open-cut subway station, comprising the following steps:

[0033] S1: Complete the construction of the open-cut main structure 1 of the station according to the open-cut construction process of the station;

[0034] S2: During the construction of the open-cut main structure 1, temporary columns, temporary concrete walls 2 and the first steel-concrete joist 3 are set at the interface between the preset dark-cut expansion area and the open-cut main structure 1 to achieve structural force conversion during horizontal expansion;

[0035] S3: When the open-cut main structure 1 of the station reaches the design strength and the advanced reinforcement measures are completed, the door openings are removed at both ends of the dark excavation expansion area, excavation is carried out in opposite directions and a certain length of one-way penetration is reserved in the middle to complete the construction of the dark excavation expansion area;

[0036] S4: Carry out secondary lining construction in the dark excavation expansion area.

[0037] In this embodiment, the specific construction method of S2 is: construct open excavation foundation pit - construct station floor - construct temporary columns and temporary concrete wall 2 - construct open and dark excavation interface support beam - construct side walls and each floor slab - remove the retaining piles at the open and dark excavation interface.

[0038] In this embodiment, the open-cut interface replacement beam includes a first steel concrete support beam 3 and a second steel concrete support beam 5; the first steel concrete support beam 3 is arranged at the top of the temporary concrete wall 2; the first steel concrete support beam 3 is connected to the open-cut main structure 1 through the second steel concrete detachment.

[0039] In this embodiment, the specific construction method of S3 is: excavating the upper step 7 at the horse head gate (reserving core soil for circular excavation) - erecting a steel frame 8 - setting up locking feet - erecting temporary cross braces 9 - longitudinally excavating from one end of the dark excavation expansion area to a certain distance, and temporarily closing the heading face - excavating the middle step 10 according to the excavation sequence of the upper step 7 - excavating to the end and sealing the end - then excavating the lower step 11 until the entire section is closed into a ring, and the remaining area to be expanded is excavated from the other end of the dark excavation expansion area until it is connected.

[0040] In this embodiment, in S4, the secondary lining construction includes the following steps: S41, cutting off the lower temporary concrete wall 2 and the steel frame 8, and constructing the bottom plate; S42, gradually removing the temporary cross braces 9, and constructing the inner wall and top plate of the passage to form a whole; S43, removing the temporary columns and the temporary concrete wall 2.

[0041] In this embodiment, the dark excavation section is a flat-top straight wall with a net width of 3.3m, a height of 10m, and a length of 50m, and a longitudinal excavation method is adopted.

[0042] The present invention can reduce the impact on the surrounding environment, increase the utilization rate of underground space, and create a new local horizontal expansion longitudinal excavation construction method for subsequent new construction projects and renovation and expansion projects with increased usage functions.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A partial horizontal expansion structure of an open-cut subway station, characterized in that: include: An open cut area and a dark cut extension area located on one side of the open cut area; the open cut area is provided with an open cut main structure (1); a temporary concrete wall (2) and temporary columns are provided at the interface between the open cut area and the dark cut extension area; a first steel concrete joist (3) is provided at the top of the temporary concrete wall (2); the first steel concrete joist (3) is connected to the open cut main structure (1) of the open cut area.

2. The open-cut subway station partial horizontal expansion structure according to claim 1, characterized in that: A wall longitudinal beam (4) is provided at the top end of the first steel-concrete supporting beam (3).

3. The open-cut subway station partial horizontal expansion structure according to claim 2, characterized in that: A top plate transverse beam (6) is provided at the top end of the longitudinal beam (4) under the wall.

4. The open-cut subway station partial horizontal expansion structure according to claim 1, characterized in that: The first steel concrete support beam (3) is connected to the open cut main structure (1) via a second steel concrete support beam (5).

5. A construction method for a local horizontal expansion structure of an open-cut subway station, characterized in that: The following steps are involved: S1: Complete the construction of the station’s open-cut main structure (1) according to the station’s open-cut construction process; S2: During the construction of the open-cut main structure (1), temporary columns, temporary concrete walls (2) and the first type steel concrete support beam (3) are set at the interface between the preset dark-cut expansion area and the open-cut main structure (1) to achieve structural force conversion during horizontal expansion; S3: When the open-cut main structure (1) of the station reaches the designed strength and the advanced reinforcement measures are completed, the door openings are removed at both ends of the dark-cut expansion area, and excavation is carried out in opposite directions with a certain length of one-way penetration reserved in the middle to complete the construction of the dark-cut expansion area; S4: Carry out secondary lining construction in the dark excavation expansion area.

6. The construction method of the open-cut subway station partial horizontal expansion structure according to claim 5 is characterized in that: The specific construction method of S2 is: construct open excavation foundation pit - construct station floor - construct temporary columns and temporary concrete walls (2) - construct replacement beams at the open and dark excavation interface - construct side walls and each floor slab - remove the retaining piles at the open and dark excavation interface.

7. The construction method of the open-cut subway station partial horizontal expansion structure according to claim 6 is characterized in that: The open-cut and concealed-cut interface replacement beam comprises a first-type steel concrete support beam (3) and a second-type steel concrete support beam (5); the first-type steel concrete support beam (3) is arranged at the top of a temporary concrete wall (2); the first-type steel concrete support beam (3) is connected to the open-cut main structure (1) through the second-type steel concrete separation.

8. The construction method of the open-cut subway station partial horizontal expansion structure according to claim 6, characterized in that: The specific construction method of S3 is as follows: excavating the upper step (7) at the horse head gate - erecting a steel frame (8) - installing locking feet - erecting temporary cross braces (9) - longitudinally excavating from one end of the dark excavation expansion area to a certain distance, and temporarily closing the heading face - excavating the middle step (10) according to the excavation sequence of the upper step (7) - excavating to the end and sealing the end - then excavating the lower step (11) until the entire section is closed into a ring, and the remaining area to be expanded is excavated from the other end of the dark excavation expansion area until it is connected.

9. The construction method of the open-cut subway station partial horizontal expansion structure according to claim 8, characterized in that: In S4, the secondary lining construction includes the following steps: S41, cut off the lower temporary concrete wall (2) and steel frame (8), and construct the bottom plate; S42, remove the temporary cross brace (9) step by step, and construct the inner wall and top plate of the passage to form a whole; S43, remove the temporary columns and temporary concrete wall (2).

10. The construction method of the open-cut subway station partial horizontal expansion structure according to claim 9, characterized in that: The section of the dark excavation is a flat-top straight wall.

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