A construction method and retaining structure for a shield tunneling machine to obliquely penetrate the side wall of a subway station.

Abstract

A construction method and retaining structure for a tunnel boring machine (TBM) to obliquely penetrate the side wall of a subway station involves constructing closed diaphragm walls and transverse side walls on the outer and inner surfaces of the station side wall at an angle to the TBM's tunneling direction, respectively, and connecting them to the station side wall to form a closed retaining structure. The retaining structure includes transverse plain walls and transverse side walls perpendicular to the TBM's direction. The method involves manually breaking open an opening in the subway station's side wall; the TBM then breaks through the transverse plain walls of the diaphragm wall, penetrates the opening in the station side wall, and breaks through the transverse side walls, thus completing the oblique penetration of the subway station side wall. This invention avoids the need for the TBM to obliquely penetrate the subway station's side wall and also avoids the use of underground mining methods to break through the station side wall, saving costs and reducing risks.

Description

Technical Field

[0001] This invention relates to the field of urban rail transit engineering technology, specifically to a construction method and retaining structure for a shield tunneling machine to obliquely penetrate the side wall of a subway station. Background Technology

[0002] When subway stations are developed in conjunction with land parcels, the subway stations are often constructed concurrently with the above-ground structures, and the side walls of the subway stations are also part of the side walls of the above-ground structures. However, due to road red lines, in order to avoid entering the red line area, the subway side walls sometimes need to be made inclined to the direction of tunnel boring. When the tunnel boring machine is used to construct the station section, how to make the tunnel boring machine obliquely pass through the side walls of the subway station becomes an unavoidable problem.

[0003] In the past, when subway projects encountered situations where tunnel boring machines (TBMs) needed to pass through side walls at an angle, the common approaches were: 1. Constructing a section of straight wall between the station side walls to ensure perpendicularity to the TBM and facilitate its passage; 2. Using the mining method to break through the station side walls, and then the TBM would pass through the mining section. Of course, the mining method has a longer cycle, higher cost, and is more difficult to control groundwater.

[0004] When a land parcel is developed in conjunction with a subway station, the side wall of the subway station serves as the bottom side wall of the land parcel's above-ground structure. In order not to affect the overall shape of the land parcel and to make effective use of the land area, the side wall of the subway station cannot be changed to a straight wall. Cutting the side wall of the station by the tunnel boring machine would cause safety issues for both the wall and the tunnel boring machine. Therefore, the main purpose of this invention is to ensure the safety of the tunnel boring machine when it passes through the side wall at an angle. Summary of the Invention

[0005] This invention provides a construction method and retaining structure for shield tunneling obliquely through the side wall of a subway station, the purpose of which is to solve the technical problem of shield tunneling obliquely through the side wall of a subway station.

[0006] The technical solution of this invention is implemented as follows:

[0007] The present invention provides a construction method for a shield tunneling obliquely through the side wall of a subway station, characterized by comprising the following construction steps;

[0008] Step 1: Construct the protective enclosure for the station's side walls outside the station.

[0009] Before the shield tunnel passes through the side wall of the subway station, a closed underground continuous wall 1 is constructed on the outside of the station side wall A, which is inclined at an angle to the shield tunneling direction, on the two shield tunneling lines. It includes a transverse continuous wall 11 perpendicular to the shield tunneling direction and two longitudinal continuous walls 12 in the same direction as the shield tunneling, which are closed and connected to its two ends. The longitudinal continuous walls 12 are outside the shield tunneling area. The two longitudinal continuous walls extend to the station side wall A and are closed and connected to the station side wall, so that the continuous wall retaining structure is closed, which can strengthen the stratum and stop water. Dewatering wells are drilled inside the continuous wall.

[0010] Step 2: Construct the protective enclosure for the station's side walls.

[0011] Inside the station side wall A within the subway station, on each of the two tunnel boring machine (TBM) lines, perpendicular to the TBM tunneling direction, a transverse side wall 2 is constructed. One end of each transverse side wall is close to the station side wall A and connected to the station side wall A or a nearby station wall B. The other end of the transverse side wall 2 is connected to the station side wall A or a nearby station wall via a longitudinal side wall 21 constructed in the same direction as the TBM tunneling direction, forming a closed enclosure structure. The longitudinal side wall 21 and the enclosure wall are outside the TBM tunneling area.

[0012] Step 3: Manually break down the side wall A of the subway station.

[0013] On both shield tunneling lines, manual demolition was carried out to create openings in the side wall A of the subway station.

[0014] Step 4: The shield tunneling machine breaks through the horizontal plain wall 11 of the plain underground continuous wall 1, opens a hole through the side wall of the station, and breaks through the horizontal side wall 2 to complete the diagonal crossing of the subway station side wall.

[0015] The present invention provides a retaining structure for a shield tunneling machine obliquely passing through the side wall of a subway station, comprising a station side wall A and a retaining wall B; characterized in that, outside the station side wall A which is inclined at an angle to the shield tunneling direction, closed underground continuous walls 1 are constructed on two shield tunneling lines respectively, each including a transverse underground continuous wall 11 perpendicular to the shield tunneling direction and two longitudinal underground continuous walls 12 connected to its two ends in the same direction as the shield tunneling machine. The longitudinal underground continuous walls 12 are outside the shield tunneling area, and the two longitudinal underground continuous walls extend to the station side wall A and are connected to the station side wall in a closed manner, so that the continuous wall retaining structure is closed, and dewatering wells are drilled inside the underground continuous walls 1;

[0016] Inside the station side wall A inside the subway station, on the two shield tunneling lines, a transverse side wall 2 is constructed perpendicular to the shield tunneling direction. One end of each transverse side wall is close to the station side wall A and connected to the station side wall A or the adjacent station side wall. The other end of the transverse side wall 2 is connected to the station side wall A or the adjacent station side wall through a longitudinal side wall 21 constructed in the same direction as the shield tunneling direction, forming a closed enclosure structure. The longitudinal side wall 21 and the enclosure wall are outside the shield tunneling area.

[0017] The beneficial effects of this invention are:

[0018] This invention avoids tunnel boring machines from obliquely passing through the side walls of subway stations, and also avoids using the underground mining method to break through the side walls of stations, thus saving costs and reducing risks. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the shield tunneling obliquely passing through the side wall and retaining structure of a subway station according to the present invention;

[0020] Explanation of the attached drawing numbers:

[0021] Station side wall A, enclosure wall B, plain underground continuous wall 1, transverse plain wall 11, longitudinal plain wall 12, transverse side wall 2, longitudinal side wall 21; Detailed Implementation

[0022] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] See Figure 1 As shown, a construction method for a shield tunneling obliquely through the side wall of a subway station according to the present invention includes the following construction steps;

[0024] Step 1: Construct the protective enclosure for the station's side walls outside the station.

[0025] Before the tunnel boring machine (TBM) obliquely passes through the side wall of the subway station, closed underground continuous walls 1 are constructed on both TBM tunneling lines outside the station side wall A, which is at an angle to the TBM's tunneling direction. These walls include a transverse continuous wall 11 perpendicular to the TBM's tunneling direction and two longitudinal continuous walls 12 connected to its ends in the same direction as the TBM. The longitudinal continuous walls 12 extend outside the TBM tunneling area to the station side wall A and connect to it, creating a closed loop of continuous wall enclosure. This reinforces the ground and prevents water seepage. Dewatering wells are installed inside the continuous walls. (See also...) Figure 1 As shown, the underground diaphragm wall 1 was constructed separately on the two shield tunneling lines, independently of each other, to avoid mutual interference during construction.

[0026] Step 2: Construct the protective enclosure for the station's side walls.

[0027] Inside the station side wall A within the subway station, on each of the two tunnel boring machine (TBM) lines, a transverse side wall 2 is constructed perpendicular to the TBM tunneling direction. One end of each transverse side wall is close to the station side wall A and connected to the station side wall A or a nearby station wall B. The other end of the transverse side wall 2 is connected to the station side wall A or a nearby station wall via a longitudinal side wall 21 constructed in the same direction as the TBM tunneling direction, forming a closed enclosure structure. The longitudinal side wall 21 and wall B are outside the TBM tunneling area. The transverse side wall 2 is a wall suitable for TBM tunneling.

[0028] Step 3: Manually break down the side wall A of the subway station.

[0029] On both shield tunneling lines, manual demolition was carried out to create openings in the side wall A of the subway station.

[0030] Step 4: The shield tunneling machine breaks through the horizontal plain wall 11 of the plain underground continuous wall 1, opens a hole through the side wall of the station, and breaks through the horizontal side wall 2 to complete the diagonal crossing of the subway station side wall.

[0031] The present invention provides a retaining structure for a shield tunneling machine obliquely passing through the side wall of a subway station, including a station side wall A and a retaining wall B. Outside the station side wall A, which is at an angle to the direction of shield tunneling, closed underground continuous walls 1 are constructed on two shield tunneling lines. Each of the underground continuous walls 1 includes a transverse underground continuous wall 11 perpendicular to the direction of shield tunneling and two longitudinal underground continuous walls 12 connected to both ends of the transverse continuous wall 11 in the same direction as the shield tunneling machine. The longitudinal underground continuous walls 12 are located outside the shield tunneling area. The two longitudinal underground continuous walls extend to the station side wall A and are connected to the station side wall, thus making the continuous wall retaining structure closed. Dewatering wells are installed inside the underground continuous walls 1.

[0032] Inside the station side wall A inside the subway station, on the two shield tunneling lines, a transverse side wall 2 is constructed perpendicular to the shield tunneling direction. One end of each transverse side wall is close to the station side wall A and connected to the station side wall A or the adjacent station side wall. The other end of the transverse side wall 2 is connected to the station side wall A or the adjacent station side wall through a longitudinal side wall 21 constructed in the same direction as the shield tunneling direction, forming a closed enclosure structure. The longitudinal side wall 21 and the enclosure wall are outside the shield tunneling area.

[0033] Example

[0034] The A Street Station of Beijing Subway Line C Phase II is located within the development site. It is a pit within a pit of the integrated foundation pit of the site, and the site and the subway are integrated, so the site and the subway were constructed at the same time. However, A Street Station is a reserved station that will connect with Line B in the future.

[0035] This raises a problem: the integrated development of the land parcel and the subway is constrained by the road boundary and has to be built with a sloping wall. Line B will not be built in the near future, and how the subway tunnel section will pass through the sloping wall of A Street Station will become a problem that needs to be solved.

[0036] The size of the tunnel boring machine (TBM) and the height of the track surface for Line B in the long term are unknown. Improper handling could prevent the TBM from successfully breaking through the sloping wall of the A Street station. Against this backdrop, the method of this invention was used inside the station, with the sloping wall later manually removed to ensure a smooth connection between the tunnel section and the station.

[0037] The advantage of manually chiseling away the sloping wall is its high flexibility, allowing for the chiseling to be done according to the relevant dimensions of the future B-line tunnel boring machine. Furthermore, the protective measures for the tunnel boring machine crossing the sloping wall in the future may involve dewatering or other methods. Therefore, we construct the structure of this invention in advance outside the sloping wall. This not only ensures a closed enclosure for the subway's retaining structure but also provides conditions for future protective measures when the tunnel boring machine crosses the sloping wall.

Claims

1. A method for constructing a shield to pass obliquely through a side wall of a subway station, characterized in that, The construction steps include: Step 1: construction of the station side wall outside the station, Before the shield obliquely passes through the station side wall, a closed plain underground continuous wall (1) is constructed on the station side wall (A) outside the station at an oblique angle to the shield tunneling direction, including a transverse wall (11) perpendicular to the shield tunneling direction and two longitudinal walls (12) connected to the ends of the transverse wall and in the same direction as the shield, the longitudinal walls (12) extending outside the shield tunneling area and being connected to the station side wall (A) to form a closed continuous wall structure, which reinforces the stratum and prevents water leakage, and a dewatering well is constructed inside the continuous wall; Step 2: construction of the station side wall inside the station, Inside the station side wall (A) in the subway station, a transverse wall (2) is constructed on both shield tunneling lines perpendicular to the shield tunneling direction, and one end of each transverse wall is connected to the station side wall (A) or the adjacent station side wall (B); the other end of the transverse wall (2) is connected to the station side wall (A) or the adjacent station side wall (B) through a longitudinal wall (21) constructed in the same direction as the shield tunneling direction; the longitudinal wall (21) and the wall form a closed enclosure structure; the longitudinal wall (21) and the wall are outside the shield tunneling area; Step 3: manual demolition of the station side wall (A) of the subway station, The station side wall (A) of the subway station is manually demolished on both shield lines; Step 4: shield demolition of the transverse wall (11) of the plain underground continuous wall (1), hole opening through the station side wall, shield demolition of the transverse wall (2), and completion of the oblique passing through the station side wall.

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