Middle partition wall structure for multi-arch tunnel

Abstract

The utility model relates to the technical field of underground tunnels, in particular to a mid-partition wall structure for a multi-arch tunnel, and aims to solve the problems that an arch part of a mid-partition wall is void and an arch frame is not tightly connected, the mid-partition wall structure comprises an arc-shaped pre-embedded steel plate and a plane-shaped pre-embedded steel plate, and the arc-shaped pre-embedded steel plate is arranged in the section direction of a primary support steel arch frame of the multi-arch tunnel; the arc-shaped embedded steel plate is connected with the section of the multi-arch tunnel primary support steel arch frame in a welding manner; the planar pre-embedded steel plate is arranged along the outer side wall of the multi-arch tunnel primary support steel arch frame, and the planar pre-embedded steel plate is connected with the outer side wall of the multi-arch tunnel primary support steel arch frame through welding; the arc-shaped pre-embedded steel plate and the plane-shaped pre-embedded steel plate are also connected through welding; embedded steel bars are arranged on the sides, away from the multi-arch tunnel primary support steel arch, of the arc-shaped embedded steel plates and the plane-shaped embedded steel plates, and the parts, protruding out of the arc-shaped embedded steel plates, of the embedded steel bars are embedded in the mid-partition wall concrete structure. The connecting structure has the effect of improving the connecting stability of the mid-partition wall and the primary support steel arch.

Description

Technical Field

[0001] The present application relates to the technical field of underground tunnels, and in particular to a middle partition wall structure for a multi-arch tunnel. Background Art

[0002] A multi-arch tunnel typically replaces the rock mass between two parallel tunnels with cement concrete, using a three-pilot tunnel construction method. This creates a structure where the two tunnels are connected by arch walls, with the connecting section in the middle being called the central partition wall. With the ongoing development of highway construction both domestically and internationally, the use of multi-arch tunnels is increasing, especially in geologically complex areas, where the requirements for multi-arch tunnels' ability to withstand eccentric loads are even higher.

[0003] The stress of a multi-arch tunnel mainly relies on the overall stress of the initial support, the middle partition wall and the surrounding rock to ensure the stability of the tunnel and its safe service life. The middle partition wall is the core component of the double-arch tunnel structure. The stress is very complex and it is the stress concentration point of the tunnel (tension, compression, bending, torsion, and shear). It utilizes the continuity of the space inside the tunnel and effectively reduces the stress concentration in the tunnel section. Especially in areas with large terrain undulations, multi-arch tunnels can make full use of the terrain, reduce the amount of earth and stone, and reduce the difficulty of construction. In the construction of multi-arch tunnels, the connection between the middle partition wall and the initial support steel arch frame is a key link. The stress characteristics mainly include bending moment, shear force and compression. A good connection can ensure the stability of the tunnel structure and prevent the tunnel from deformation or displacement during operation.

[0004] The traditional technology is used to connect the intermediate partition wall and the initial support steel arch frame. The initial support steel arch frame is overlapped on the arch part of the intermediate partition wall. This is prone to problems such as the arch part of the intermediate partition wall being hollow and the arch frame being loosely connected. It causes local settlement, instability, displacement of the tunnel, and even longitudinal cracks in the tunnel arch part, which reduces the stability of the intermediate partition wall. Therefore, it needs to be improved. Utility Model Content

[0005] In order to improve the stability of the connection between the middle partition wall and the initial supporting steel arch frame, the present application provides a middle partition wall structure for a multi-arch tunnel.

[0006] The present application provides a middle partition wall structure for a multi-arch tunnel using the following technical solutions:

[0007] A middle partition wall structure for a multi-arch tunnel comprises an initial supporting steel arch frame of the multi-arch tunnel, a middle partition wall concrete structure and a secondary lining of the multi-arch tunnel, wherein the initial supporting steel arch frame of the multi-arch tunnel is provided with a fracture at the middle partition wall concrete structure, and an arc-shaped embedded steel plate and a plane-shaped embedded steel plate are provided at the fracture, the arc-shaped embedded steel plate is provided along the cross-sectional direction of the initial supporting steel arch frame of the multi-arch tunnel, and the arc-shaped embedded steel plate is connected to the cross-sectional direction of the initial supporting steel arch frame of the multi-arch tunnel by welding; the plane-shaped embedded steel plate is provided along the outer side wall of the initial supporting steel arch frame of the multi-arch tunnel, and the plane-shaped embedded steel plate is connected to the outer side wall of the initial supporting steel arch frame of the multi-arch tunnel by welding; the arc-shaped embedded steel plate and the plane-shaped embedded steel plate are also connected by welding; the arc-shaped embedded steel plate and the plane-shaped embedded steel plate are both provided with embedded steel bars on the side away from the initial supporting steel arch frame of the multi-arch tunnel, and the part of the embedded steel bars protruding from the arc-shaped embedded steel plate is buried in the middle partition wall concrete structure.

[0008] By adopting the above technical solution, an arc-shaped embedded steel plate is installed at the reserved fracture. After the position is determined, the arc-shaped embedded steel plate is welded to the initial support steel arch frame of the multi-arch tunnel. Then, one end of the flat embedded steel plate is installed on the arc-shaped embedded steel plate, so that the side wall of the flat embedded steel plate is in contact with the initial support steel arch frame of the multi-arch tunnel. The flat embedded steel plate is first welded and fixed to the initial support steel arch frame of the multi-arch tunnel, and then welded and fixed to the arc-shaped embedded steel plate. Subsequently, the embedded steel bars are respectively installed on the arc-shaped embedded steel plate and the flat embedded steel plate. After determining the angle, the embedded steel bars are welded and fixed. Finally, the formwork is built and the concrete structure of the middle partition wall and the secondary lining of the multi-arch tunnel are poured. At this time, the embedded steel bars are partially buried in the concrete structure of the middle partition wall to strengthen the stability of the connection between the middle partition wall and the initial support steel arch frame.

[0009] Optionally, the length of the arc-shaped embedded steel plate is greater than the length of the cross-section of the initial support steel arch frame of the arch tunnel, and both ends of the arc-shaped embedded steel plate in the length direction protrude from the side walls of the initial support steel arch frame of the arch tunnel. The end of the arc-shaped embedded steel plate in the length direction that is close to the secondary lining of the arch tunnel is buried in the secondary lining of the arch tunnel, and the end of the arc-shaped embedded steel plate in the length direction that is far from the secondary lining of the arch tunnel is connected to the plane embedded steel plate.

[0010] Optionally, a first semicircular groove is provided on the side wall of the arc-shaped embedded steel plate close to the planar embedded steel plate, and the first semicircular groove passes through the two side walls in the width direction of the arc-shaped embedded steel plate. A connecting round rod is provided at the bottom end of the planar embedded steel plate, and the radius of the connecting round rod is the same as the radius of the first semicircular groove.

[0011] Optionally, one end of the arc-shaped embedded steel plate away from the secondary lining of the arch tunnel in the length direction also protrudes from the side wall of the planar embedded steel plate, and a soldering block is provided on the arc-shaped embedded steel plate, which is installed on the side of the first semicircular groove away from the initial support steel arch frame of the arch tunnel.

[0012] Optionally, the side wall of the planar embedded steel plate is connected to the soldering block by welding.

[0013] By adopting the above technical solution, when it is necessary to install the flat pre-embedded steel plate, the construction workers insert the connecting rod from one end of the first semicircular groove in the longitudinal direction, and then rotate the flat pre-embedded steel plate around the connecting rod until the side wall of the flat pre-embedded steel plate is in contact with the initial support steel arch frame of the multi-arch tunnel. The construction workers weld the remaining three edges of the flat pre-embedded steel plate, excluding the connecting rod, to the initial support steel arch frame of the multi-arch tunnel, and weld the side wall of the flat pre-embedded steel plate to the welding block, thus achieving a stable connection between the curved pre-embedded steel plate, the flat pre-embedded steel plate, and the initial support steel arch frame of the multi-arch tunnel.

[0014] Optionally, a clearance groove is further provided on the side wall of the arc-shaped embedded steel plate, and the clearance groove is located on a side of the first semicircular groove away from the soldering block, and the clearance groove is connected to the first semicircular groove.

[0015] By adopting the above technical solution, the design of the clearance groove facilitates the rotation of the planar embedded steel plate.

[0016] Optionally, the embedded steel bars include right-angle steel bars, connecting bars and U-shaped steel bars, the right-angle steel bars, connecting bars and U-shaped steel bars are connected in sequence, the right-angle steel bars and the connecting bars are perpendicular to each other, the connecting bars and the U-shaped steel bars are perpendicular to each other, and the right-angle steel bars and the U-shaped steel bars are dyslocated and perpendicular.

[0017] Optionally, a connecting block is installed on the side wall of the arc-shaped embedded steel plate away from the initial support steel arch frame of the arch tunnel, and a connecting groove is provided on the side wall of the connecting block in a direction parallel to the arc-shaped embedded steel plate. The connecting groove is semicircular, and the radius of the connecting groove is the same as the radius of the right-angle steel bar; a second semicircular groove is provided on the side wall of the arc-shaped embedded steel plate, and the radius of the second semicircular groove is the same as the radius of the right-angle steel bar. The second semicircular groove is connected to the connecting groove to form a circular hole for accommodating the right-angle steel bar, and the second semicircular groove passes through the side wall of the arc-shaped embedded steel plate.

[0018] Optionally, the right-angle steel bar is connected to the side wall of the arc-shaped embedded steel plate close to the second semicircular groove by welding.

[0019] Optionally, two connecting blocks are provided on each of the arc-shaped embedded steel plates, and the opening directions of the connecting grooves on the two connecting blocks are opposite, that is, the two U-shaped steel bars are not in the same plane, and the planes where the two U-shaped steel bars are located are parallel to each other.

[0020] By adopting the above technical solution, the right-angle steel bars, connecting bars, and U-shaped steel bars are pre-produced in the factory. After the arc-shaped embedded steel plates and the flat embedded steel plates are installed, the construction workers insert the right-angle steel bars along the second semicircular groove and the connecting groove into the flat embedded steel plates and the connecting block. After adjusting the angle, the right-angle steel bars are welded to the side wall of the flat embedded steel plates near the second semicircular groove. At this time, the two U-shaped steel bars form a structure similar to a "J" shape. After the concrete structure of the intermediate partition wall is poured, the connecting bars and U-shaped steel bars are embedded in the concrete structure of the intermediate partition wall to improve the stability of the connection between the initial support steel arch frame of the multi-arch tunnel and the concrete structure of the intermediate partition wall.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. Install the arc-shaped embedded steel plate at the reserved fracture, and weld the arc-shaped embedded steel plate to the initial support steel arch frame of the multi-arch tunnel after determining the position. Then install one end of the plane-shaped embedded steel plate on the arc-shaped embedded steel plate, so that the side wall of the plane-shaped embedded steel plate is in contact with the initial support steel arch frame of the multi-arch tunnel, and weld the plane-shaped embedded steel plate to the initial support steel arch frame of the multi-arch tunnel first, and then weld it to the arc-shaped embedded steel plate. Then install the embedded steel bars on the arc-shaped embedded steel plate and the plane-shaped embedded steel plate respectively, and weld the embedded steel bars to the angle after determining the angle. Finally, build the formwork and pour the concrete structure of the middle partition wall and the secondary lining of the multi-arch tunnel. At this time, the embedded steel bars are partially buried in the concrete structure of the middle partition wall to strengthen the stability of the connection between the middle partition wall and the initial support steel arch frame;

[0023] 2. When it is necessary to install the flat pre-buried steel plate, the construction personnel insert the connecting rod from one end of the length direction of the first semicircular groove, and then rotate the flat pre-buried steel plate with the connecting rod as the axis until the side wall of the flat pre-buried steel plate is in contact with the initial support steel arch frame of the multi-arch tunnel. The construction personnel weld the remaining three edges of the flat pre-buried steel plate except for the connecting rod to the initial support steel arch frame of the multi-arch tunnel, and weld the side wall of the flat pre-buried steel plate to the welding block to achieve a stable connection between the arc-shaped pre-buried steel plate, the flat pre-buried steel plate and the initial support steel arch frame of the multi-arch tunnel;

[0024] 3. The right-angle steel bars, connecting bars, and U-shaped steel bars are pre-produced in the factory. After the arc-shaped embedded steel plates and the flat embedded steel plates are installed, the construction workers insert the right-angle steel bars along the second semicircular groove and the connecting groove into the flat embedded steel plates and the connecting blocks. After adjusting the angle, the right-angle steel bars are welded to the side wall of the flat embedded steel plates near the second semicircular groove. At this time, the two U-shaped steel bars form a structure similar to a "J" shape. After the concrete structure of the middle partition wall is poured, the connecting bars and U-shaped steel bars are embedded in the middle partition wall concrete structure to improve the stability of the connection between the initial support steel arch frame of the multi-arch tunnel and the middle partition wall concrete structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a middle partition wall structure for a multi-arch tunnel according to an embodiment of the present application.

[0026] Figure 2 yes Figure 1 A magnified view of center.

[0027] Figure 3 It is a schematic structural diagram of the arc-shaped embedded steel plate and the flat-shaped embedded steel plate in the embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the setting direction of the embedded steel bars in the embodiment of the present application.

[0029] Explanation of the accompanying symbols: 1. Initial supporting steel arch frame of the multi-arch tunnel; 11. Fracture; 2. Concrete structure of the middle partition wall; 3. Secondary lining of the multi-arch tunnel; 4. Arc-shaped embedded steel plate; 41. First semicircular groove; 42. Second semicircular groove; 43. Give way groove; 5. Plane-shaped embedded steel plate; 51. Connecting round rod; 6. Embedded steel bar; 61. Right-angle steel bar; 62. Connecting bar; 63. U-shaped steel bar; 7. Welding block; 8. Connecting block; 81. Connecting groove. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The embodiment of the present application discloses a middle partition wall structure for a multi-arch tunnel. Figure 1 A middle partition wall structure for a multi-arch tunnel includes a multi-arch tunnel initial support steel arch frame 1 arranged on the outermost layer and a multi-arch tunnel secondary lining 3 arranged on the inner side of the multi-arch tunnel initial support steel arch frame 1. In this application, two tunnels, one large and one small, are included. Therefore, a middle partition wall concrete structure 2 is also provided between the two tunnels for strengthening the connection. The middle partition wall concrete structure 2 is connected to the multi-arch tunnel secondary lining 3. After the construction is completed, the multi-arch tunnel initial support steel arch frame 1 is wrapped in the middle partition wall concrete structure 2 to form a whole.

[0032] Reference Figure 1and Figure 2 The initial support steel arch frame 1 of the multi-arch tunnel is provided with fractures 11 at the middle partition wall concrete structure 2, with two fractures on each steel arch frame. To strengthen the connection strength, curved pre-embedded steel plates 4 and flat pre-embedded steel plates 5 are installed at the fractures 11, with one curved pre-embedded steel plate 4 and one flat pre-embedded steel plate 5 installed at each fracture 11.

[0033] by Figure 2 Taking one of the fractures 11 as an example, the arc-shaped embedded steel plate 4 is arranged along the cross-sectional direction of the initial support steel arch frame 1 of the multi-arch tunnel, and the top wall of the arc-shaped embedded steel plate 4 is connected to the cross-sectional direction of the bottom of the initial support steel arch frame 1 of the multi-arch tunnel by welding. The plane-shaped embedded steel plate 5 is arranged along the outer wall of the initial support steel arch frame 1 of the multi-arch tunnel, and the side wall of the plane-shaped embedded steel plate 5 is connected to the outer wall of the initial support steel arch frame 1 of the multi-arch tunnel by welding. The arc-shaped embedded steel plate 4 and the plane-shaped embedded steel plate 5 are also connected by welding. Two embedded steel bars 6 are arranged on the bottom wall of the arc-shaped embedded steel plate 4 away from the initial support steel arch frame 1 of the multi-arch tunnel, and two embedded steel bars 6 are arranged on the side wall of the plane-shaped embedded steel plate 5 away from the initial support steel arch frame 1 of the multi-arch tunnel. One end of the embedded steel bar 6 is installed on the arc-shaped embedded steel plate 4 or the plane-shaped embedded steel plate 5, and the other end is buried in the concrete structure 2 of the middle partition wall.

[0034] Reference Figure 2 The length of the arc-shaped embedded steel plate 4 is greater than the cross-sectional length of the primary supporting steel arch frame 1 of the multi-arch tunnel. Both ends of the arc-shaped embedded steel plate 4 in the longitudinal direction protrude from the sidewalls of the primary supporting steel arch frame 1 of the multi-arch tunnel. The end of the arc-shaped embedded steel plate 4 in the longitudinal direction close to the secondary lining 3 of the multi-arch tunnel is embedded in the secondary lining 3 of the multi-arch tunnel. The end of the arc-shaped embedded steel plate 4 in the longitudinal direction away from the secondary lining 3 of the multi-arch tunnel is connected to the flat embedded steel plate 5.

[0035] The arc-shaped embedded steel plate 4, the plane-shaped embedded steel plate 5 and the embedded steel bars 6 are prefabricated in the factory and transported to the construction site for assembly. During construction, the initial support steel arch frame 1 of the multi-arch tunnel is first erected and a temporary support is used to bear the weight of the initial support steel arch frame 1 of the multi-arch tunnel. The arc-shaped embedded steel plate 4 is first installed at the reserved fracture 11. After the position is determined, the arc-shaped embedded steel plate 4 is welded to the initial support steel arch frame 1 of the multi-arch tunnel. One end of the plane-shaped embedded steel plate 5 is then installed on the arc-shaped embedded steel plate 4 so that the side wall of the plane-shaped embedded steel plate 5 is in contact with the initial support steel arch frame 1 of the multi-arch tunnel. The plane-shaped embedded steel plate 5 is first welded and fixed to the initial support steel arch frame 1 of the multi-arch tunnel and then welded and fixed to the arc-shaped embedded steel plate 4. The embedded steel bars 6 are then installed on the arc-shaped embedded steel plate 4 and the plane-shaped embedded steel plate 5 respectively. After the angle is determined, the embedded steel bars 6 are welded and fixed. Finally, the formwork is built and the middle partition wall concrete structure 2 and the arch tunnel secondary lining 3 are poured. At this time, the embedded steel bars 6 are partially embedded in the middle partition wall concrete structure 2 to strengthen the stability of the connection between the middle partition wall and the initial support steel arch frame.

[0036] Reference Figure 2 and Figure 3 A first semicircular groove 41 is formed on the side wall of the arc-shaped embedded steel plate 4 near the flat embedded steel plate 5. The first semicircular groove 41 penetrates the two side walls of the arc-shaped embedded steel plate 4 in the width direction. A connecting rod 51 is provided at the bottom end of the flat embedded steel plate 5. The radius of the connecting rod 51 is the same as that of the first semicircular groove 41. A clearance groove 43 is also formed on the side wall of the arc-shaped embedded steel plate 4. The clearance groove 43 is located on the side of the first semicircular groove 41 away from the soldering block 7. The length direction of the clearance groove 43 is parallel to the length direction of the first semicircular groove 41, and the clearance groove 43 is connected to the first semicircular groove 41.

[0037] The end of the curved pre-embedded steel plate 4, which is farther from the secondary lining 3 of the multi-arch tunnel, also protrudes from the sidewall of the planar pre-embedded steel plate 5. A soldering block 7 is provided on the curved pre-embedded steel plate 4. The soldering block 7 is mounted on the side of the first semicircular groove 41 away from the initial support steel arch frame 1 of the multi-arch tunnel. The soldering block 7 is connected to the curved pre-embedded steel plate 4 by welding, and the sidewall of the planar pre-embedded steel plate 5 is also connected to the soldering block 7 by welding.

[0038] When it is necessary to install the planar pre-embedded steel plate 5, the construction workers hold the planar pre-embedded steel plate 5 and insert the connecting rod 51 from one end in the length direction of the first semicircular groove 41, and then rotate the planar pre-embedded steel plate 5 with the connecting rod 51 as the axis until the side wall of the planar pre-embedded steel plate 5 is in contact with the initial support steel arch frame 1 of the multi-arch tunnel. The design of the clearance groove 43 facilitates the rotation of the planar pre-embedded steel plate 5. The construction workers weld the remaining three edges of the planar pre-embedded steel plate 5 except the connecting rod 51 to the initial support steel arch frame 1 of the multi-arch tunnel, and weld the side wall of the planar pre-embedded steel plate 5 to the soldering block 7 to achieve a stable connection between the arc-shaped pre-embedded steel plate 4, the planar pre-embedded steel plate 5 and the initial support steel arch frame 1 of the multi-arch tunnel.

[0039] Reference Figure 2 and Figure 3 The embedded steel bars 6 include a right-angle steel bar 61, a connecting bar 62, and a U-shaped steel bar 63. One end of the right-angle steel bar 61 is welded to the connecting bar 62, and the two bars are perpendicular to each other. The end of the connecting bar 62, away from the right-angle steel bar 61, is welded to the U-shaped steel bar 63, and the planes of the connecting bar 62 and the U-shaped steel bar 63 are perpendicular to each other. The planes of the right-angle steel bar 61 and the U-shaped steel bar 63 are also perpendicular to each other.

[0040] Reference Figure 2 and Figure 3 Both the arc-shaped embedded steel plate 4 and the plane-shaped embedded steel plate 5 are installed with embedded steel bars 6. In this embodiment, the plane-shaped embedded steel plate 5 is taken as an example for demonstration.

[0041] Two connecting blocks 8 are installed on the side wall of the planar embedded steel plate 5 away from the initial support steel arch frame 1 of the multi-arch tunnel. The connecting blocks 8 are welded and fixed to the planar embedded steel plate 5. A connecting groove 81 is provided on the side wall of the connecting block 8 in a direction parallel to the planar embedded steel plate 5. The connecting groove 81 is semicircular, and the radius of the connecting groove 81 is the same as the radius of the right-angle steel bar 61. A second semicircular groove 42 is provided on the side wall of the planar embedded steel plate 5. The radius of the second semicircular groove 42 is the same as the radius of the right-angle steel bar 61. The second semicircular groove 42 is connected to the connecting groove 81 to form a circular hole for accommodating the right-angle steel bar 61. The second semicircular groove 42 passes through the side wall of the planar embedded steel plate 5. The opening directions of the connecting grooves 81 on the two connecting blocks 8 are opposite, that is, the two U-shaped steel bars 63 are not in the same plane, and the planes where the two U-shaped steel bars 63 are located are parallel to each other. The two embedded steel bars 6 are staggered.

[0042] The right-angle steel bars 61, connecting bars 62, and U-shaped steel bars 63 are pre-produced in the factory. After the arc-shaped embedded steel plate 4 and the flat embedded steel plate 5 are installed, the construction workers insert the right-angle steel bars 61 along the second semicircular groove 42 and the connecting groove 81 into the flat embedded steel plate 5 and the connecting block 8. After adjusting the angle, the right-angle steel bars 61 are welded to the side wall of the flat embedded steel plate 5 near the second semicircular groove 42. At this time, the two U-shaped steel bars 63 form a structure similar to a "J" shape. After the middle partition wall concrete structure 2 is cast, the connecting bars 62 and U-shaped steel bars 63 are embedded in the middle partition wall concrete structure 2 to improve the stability of the connection between the initial support steel arch frame 1 of the multi-arch tunnel and the middle partition wall concrete structure 2.

[0043] Reference Figure 4 The setting direction of the embedded steel bars 6 at the four fractures 11 is as follows Figure 4 As shown, the connecting bars 62 on the two upper curved pre-embedded steel plates 4 are vertically arranged, while all other connecting bars 62 are perpendicular to the plane of the curved pre-embedded steel plates 4 or the flat pre-embedded steel plates 5 on which they are located. This arrangement can resist the bending moment and shear forces generated during use, thereby improving the stability of the connection between the initial support steel arch frame 1 of the multi-arch tunnel and the central partition wall concrete structure 2.

[0044] The implementation principle of the intermediate partition wall structure for a multi-arch tunnel in the embodiment of the present application is as follows: the construction personnel first weld the arc-shaped embedded steel plate 4 to the initial support steel arch frame 1 of the multi-arch tunnel, and then insert the connecting rod 51 from one end in the length direction of the first semicircular groove 41, and then rotate the plane-shaped embedded steel plate 5 with the connecting rod 51 as the axis until the side wall of the plane-shaped embedded steel plate 5 is in contact with the initial support steel arch frame 1 of the multi-arch tunnel. The construction personnel weld and fix the remaining three edges of the plane-shaped embedded steel plate 5 except the connecting rod 51 to the initial support steel arch frame 1 of the multi-arch tunnel, and weld and fix the side wall of the plane-shaped embedded steel plate 5 to the soldering block 7, thereby achieving a stable connection between the arc-shaped embedded steel plate 4, the plane-shaped embedded steel plate 5 and the initial support steel arch frame 1 of the multi-arch tunnel. The right-angled steel bars 61 are inserted into the planar pre-embedded steel plate 5 and the connecting block 8 along the second semicircular groove 42 and the connecting groove 81. After adjusting the angle, the right-angled steel bars 61 are welded to the sidewall of the planar pre-embedded steel plate 5 near the second semicircular groove 42. The two U-shaped steel bars 63 now form a roughly "J"-shaped structure. After the middle partition wall concrete structure 2 is cast, the connecting bars 62 and the U-shaped steel bars 63 are embedded in the middle partition wall concrete structure 2 to enhance the stability of the connection between the initial support steel arch frame 1 of the multi-arch tunnel and the middle partition wall concrete structure 2.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A middle partition wall structure for a multi-arch tunnel, comprising a multi-arch tunnel primary support steel arch frame (1), a middle partition wall concrete structure (2) and a multi-arch tunnel secondary lining (3), characterized in that: The arched tunnel initial support steel arch frame (1) is provided with a fracture (11) at the middle partition wall concrete structure (2), and an arc-shaped embedded steel plate (4) and a plane-shaped embedded steel plate (5) are provided at the fracture (11), the arc-shaped embedded steel plate (4) is provided along the cross-sectional direction of the arched tunnel initial support steel arch frame (1), and the arc-shaped embedded steel plate (4) is connected to the cross-sectional direction of the arched tunnel initial support steel arch frame (1) by welding; the plane-shaped embedded steel plate (5) is provided along the cross-sectional direction of the arched tunnel initial support steel arch frame (1) ), the planar embedded steel plate (5) is connected to the outer wall of the initial support steel arch frame (1) of the multi-arch tunnel by welding; the arc-shaped embedded steel plate (4) is also connected to the planar embedded steel plate (5) by welding; the arc-shaped embedded steel plate (4) and the planar embedded steel plate (5) are both provided with embedded steel bars (6) on the side away from the initial support steel arch frame (1) of the multi-arch tunnel, and the part of the embedded steel bars (6) protruding from the arc-shaped embedded steel plate (4) is embedded in the middle partition wall concrete structure (2).

2. The intermediate partition wall structure for a multi-arch tunnel according to claim 1, characterized in that: The length of the arc-shaped embedded steel plate (4) is greater than the length of the cross-section of the initial supporting steel arch frame (1) of the multi-arch tunnel; both ends of the arc-shaped embedded steel plate (4) in the length direction protrude from the side walls of the initial supporting steel arch frame (1) of the multi-arch tunnel; one end of the arc-shaped embedded steel plate (4) in the length direction that is close to the secondary lining (3) of the multi-arch tunnel is embedded in the secondary lining (3) of the multi-arch tunnel; and one end of the arc-shaped embedded steel plate (4) in the length direction that is far from the secondary lining (3) of the multi-arch tunnel is connected to the plane-shaped embedded steel plate (5).

3. The intermediate partition wall structure for a multi-arch tunnel according to claim 2, characterized in that: A first semicircular groove (41) is provided on the side wall of the arc-shaped embedded steel plate (4) close to the plane-shaped embedded steel plate (5), and the first semicircular groove (41) passes through the two side walls of the arc-shaped embedded steel plate (4) in the width direction. A connecting round rod (51) is provided at the bottom end of the plane-shaped embedded steel plate (5), and the radius of the connecting round rod (51) is the same as the radius of the first semicircular groove (41).

4. The intermediate partition wall structure for a multi-arch tunnel according to claim 3, characterized in that: One end of the arc-shaped embedded steel plate (4) in the longitudinal direction away from the secondary lining (3) of the multi-arch tunnel also protrudes from the side wall of the planar embedded steel plate (5); a soldering block (7) is provided on the arc-shaped embedded steel plate (4); and the soldering block (7) is installed on a side of the first semicircular groove (41) away from the initial supporting steel arch frame (1) of the multi-arch tunnel.

5. The intermediate partition wall structure for a multi-arch tunnel according to claim 4, characterized in that: The side wall of the planar embedded steel plate (5) is connected to the soldering block (7) by welding.

6. The intermediate partition wall structure for a multi-arch tunnel according to claim 1, characterized in that: A clearance groove (43) is also provided on the side wall of the arc-shaped embedded steel plate (4). The clearance groove (43) is located on a side of the first semicircular groove (41) away from the soldering block (7), and the clearance groove (43) is communicated with the first semicircular groove (41).

7. The intermediate partition wall structure for a multi-arch tunnel according to claim 1, characterized in that: The embedded steel bars (6) include right-angle steel bars (61), connecting bars (62) and U-shaped steel bars (63); the right-angle steel bars (61), connecting bars (62) and U-shaped steel bars (63) are connected in sequence; the right-angle steel bars (61) and the connecting bars (62) are perpendicular to each other; the connecting bars (62) and the U-shaped steel bars (63) are perpendicular to each other; and the right-angle steel bars (61) and the U-shaped steel bars (63) are dyslocated and perpendicular to each other.

8. The intermediate partition wall structure for a multi-arch tunnel according to claim 7, characterized in that: A connecting block (8) is installed on the side wall of the arc-shaped embedded steel plate (4) away from the initial supporting steel arch frame (1) of the multi-arch tunnel, and a connecting groove (81) is provided on the side wall of the connecting block (8) in a direction parallel to the arc-shaped embedded steel plate (4), and the connecting groove (81) is semicircular, and the radius of the connecting groove (81) is the same as the radius of the right-angle steel bar (61); a second semicircular groove (42) is provided on the side wall of the arc-shaped embedded steel plate (4), and the radius of the second semicircular groove (42) is the same as the radius of the right-angle steel bar (61), and the second semicircular groove (42) is connected to the connecting groove (81) to form a circular hole for accommodating the right-angle steel bar (61), and the second semicircular groove (42) passes through the side wall of the arc-shaped embedded steel plate (4).

9. The intermediate partition wall structure for a multi-arch tunnel according to claim 8, characterized in that: The right-angle steel bar (61) is connected to the side wall of the arc-shaped embedded steel plate (4) close to the second semicircular groove (42) by welding.

10. The intermediate partition wall structure for a multi-arch tunnel according to claim 8, characterized in that: Two connecting blocks (8) are provided on each of the arc-shaped embedded steel plates (4), and the opening directions of the connecting grooves (81) on the two connecting blocks (8) are opposite, that is, the two U-shaped steel bars (63) are not in the same plane, and the planes where the two U-shaped steel bars (63) are located are parallel to each other.

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