Shield side launching large angle skew cross passage structure

Abstract

The application relates to the field of tunnel construction, in particular to a large-angle oblique cross passage structure for shield side launching, wherein a support body is made of H-shaped steel welding, the support body comprises an arch-shaped part, transition parts arranged on the two sides of the arch-shaped part, vertical parts arranged at the two ends of the transition parts and extending downwards, and a horizontal part at the bottom of the vertical part; a connecting unit comprises a first connecting rod connected to the position of the arch-shaped part, a second connecting rod connected to the transition part, and a third connecting rod connected to the vertical part; in the embodiment, a model is established, a standard cross passage section limit is determined, an optimal cross passage and a tunnel straight line oblique angle are determined, and the safety distance of the equipment and the passage structure during the shield machine rotation is ensured. The larger the oblique angle is, the smaller the oblique opening horsehead door construction section is, and the lower the construction risk is. The cooperation design of the oblique passage and the cross passage avoids the surface road, reduces the obstruction to the surface traffic, reduces the influence on the surrounding environment, and occupies as little surface pavement as possible.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction, specifically to a shield-side starting large-angle oblique cross passage structure. Background Technology

[0002] Currently, in urban subway tunnel construction in my country, the shield tunneling method has become the preferred method due to its advantages such as minimal impact from ground factors, safe excavation, fast construction speed, minimal environmental impact, and high degree of automation. The main technologies of shield tunneling construction include initiation, excavation, and arrival, among which the shield initiation stage is the key and also one of the most challenging aspects.

[0003] Commonly used shield tunneling launching methods can no longer meet the needs of complex environmental conditions. The shield launching location is located under an urban expressway, where surface road traffic is busy, the surrounding environmental risk sources are complex, and it is not possible to occupy the road for construction. Therefore, special launching schemes must be adopted for shield tunneling construction.

[0004] Therefore, the tunnel boring machine must be moved from the cross passage to the shield launching shaft for tunneling construction. A large-angle oblique cross passage with the main line of the tunnel section must be established to ensure that the tunnel boring machine can quickly and safely reach the launching shaft position for tunneling construction.

[0005] Therefore, a shield-side starting large-angle oblique cross passage structure is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a shield tunnel side-launching large-angle oblique cross passage structure, including a support unit and a connecting unit; the support unit includes multiple support bodies; the support body is welded from H-beams, and the support body includes an arched part, transition parts provided on both sides of the arched part, vertical parts extending downward from both ends of the transition parts, and a horizontal part at the bottom of the vertical parts; the connecting unit includes a first connecting rod connected to the arched part, a second connecting rod connected to the transition part, and a third connecting rod connected to the vertical part, and the first, second, and third connecting rods are all made of H-beams;

[0008] The first, second, and third connecting rods are all bent and inclined upwards; the support body is vertically arranged along the inclination angle of the first, second, and third connecting rods.

[0009] Preferably, the arched portion and the transition portion are respectively connected to the first connecting rod and the second connecting rod via quick-release components;

[0010] The quick-release assembly includes an arc-shaped clamping plate; the clamping plate has a C-shaped cross-section, and fixing holes are provided at both ends of the clamping plate, with the fixing holes on the clamping plate corresponding one-to-one with the fixing holes provided on the arched part and the transition part; the upper surface of the clamping plate is provided with oppositely arranged buckles, the ends of which are bent vertically inward and buckled onto the arched part and the transition part.

[0011] The upper surface of the buckle plate has a positioning hole that extends through to the lower surface of the buckle plate.

[0012] Preferably, rectangular holes are symmetrically opened on both sides of the card plate; the lower end of the buckle plate is provided with an outward extension, the lower end of the buckle plate passes through the rectangular hole to the lower surface of the card plate, and the upper surface of the extension is attached to the lower surface of the card plate.

[0013] Preferably, the vertical part is connected to the third connecting rod via a support assembly; the support assembly includes a support plate, a connecting plate is welded to one side of the upper surface of the support plate, the connecting plate has connecting holes, and the connecting holes on the connecting plate correspond one-to-one with the connecting holes on the vertical part; the connecting plate is vertically fixed to a top plate, the top plate is located above the support plate, and both the top plate and the support plate have connecting holes.

[0014] Preferably, the edge of the tray is provided with an upwardly inclined anti-detachment part.

[0015] Preferably, the support plate and the vertical part are fixed together by a screw and a nut. Both ends of the screw are fitted with fixing plates. An extension rod is fixed to the end of the fixing plate. The end of the extension rod extends toward the inner wall of the tunnel and is fixed to a hydraulic cylinder. The output end of the hydraulic cylinder is connected to an arc plate, which is pressed against the inner wall of the earthwork.

[0016] Preferably, a U-shaped push plate is fixedly connected to the end of the extension rod, and discs are provided on both sides of the push plate, with the discs fixedly connected to the cylinder body of the hydraulic cylinder.

[0017] Preferably, a notch is provided at the edge of the U-shaped opening of the push plate; an elastic sheet is fixed to the inner wall of the disc, the disc is clamped on the push plate, and the elastic sheet is squeezed into the notch.

[0018] Preferably, a rotating groove is provided at the output end of the hydraulic cylinder, and the middle position of the concave surface of the arc plate is rotatably connected in the rotating groove.

[0019] Preferably, the top plate has reinforcing plates on both sides of its lower surface, and the reinforcing plates are welded between the connecting plate and the top plate.

[0020] The advantages of this invention are:

[0021] 1. In this embodiment, the standard cross-section limit of the transverse passage is determined through model establishment, and the optimal oblique angle between the transverse passage and the tunnel mainline is determined to ensure a safe distance between the equipment and the passage structure during the tunnel boring machine's rotation. The larger the oblique angle, the smaller the construction cross-section of the inclined gate, and the lower the construction risk. The coordinated design of the inclined passage and the transverse passage avoids surface roads, reduces obstruction to surface traffic, minimizes the impact on the surrounding environment, and occupies as little surface road space as possible.

[0022] 2. In this embodiment, a channel structure was designed based on the established model. This structure is used to support the tunnel inside the excavation tunnel as a tunnel support system to ensure the safety of tunnel excavation. The support body is set perpendicular to the tunnel surface, that is, the support body is perpendicular to the first connecting rod, the second connecting rod and the third connecting rod to ensure the safety of tunnel excavation. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the channel structure in this invention;

[0024] Figure 2 This is a front view of the channel structure in this invention;

[0025] Figure 3 This is a perspective view of the support body in this invention;

[0026] Figure 4 This is a perspective view of the interaction between the No. 1 connecting rod and the quick-release assembly in this invention;

[0027] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0028] Figure 6 This is a perspective view of the quick-release component in this invention;

[0029] Figure 7 This is a perspective view of the card plate in this invention;

[0030] Figure 8 This is a first-view perspective view of the cooperation between the support component and the third connecting rod in this invention;

[0031] Figure 9 This is a second-view perspective view of the cooperation between the support component and the third connecting rod in this invention;

[0032] Figure 10 This is a perspective view of the support component in this invention;

[0033] Figure 11 This is a first-view perspective view of the cooperation between the vertical part and the No. 3 connecting rod in this invention;

[0034] Figure 12 This is a second-view perspective view of the cooperation between the vertical part and the No. 3 connecting rod in this invention.

[0035] Figure 13 for Figure 12 A magnified view of a section at point B in the middle;

[0036] Figure 14 This is a perspective view of the push plate in this invention;

[0037] Figure 15 This is a perspective view of the fit between the hydraulic cylinder and the disc body in this invention;

[0038] Figure 16 This is a top view showing the interaction between the vertical part and the No. 3 connecting rod in this invention.

[0039] In the diagram: 1. Support body; 2. Arched section; 3. Transition section; 4. Vertical section; 5. Horizontal section; 6. Connecting rod No. 1; 7. Connecting rod No. 2; 8. Connecting rod No. 3; 9. Clamping plate; 10. Fixing hole; 11. Buckle plate; 12. Positioning hole; 13. Rectangular hole; 14. Extension section; 15. Support plate; 16. Connecting plate; 17. Connecting hole; 18. Top plate; 19. Anti-detachment section; 20. Screw; 21. Fixing plate; 22. Extension rod; 23. Hydraulic cylinder; 24. Arc plate; 25. Push plate; 26. Disc body; 27. Notch; 28. Elastic sheet; 29. ​​Rotary groove; 30. Reinforcing plate. Detailed Implementation

[0040] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0041] Reference Figure 1 - Figure 8 A shield tunnel side-launching large-angle oblique cross passage structure includes a support unit and a connecting unit. The support unit includes multiple support bodies 1. Each support body 1 is welded from H-beams and includes an arched portion 2, transition portions 3 on both sides of the arched portion 2, vertical portions 4 extending downward from both ends of the transition portions 3, and a horizontal portion 5 at the bottom of the vertical portions 4. The connecting unit includes a first connecting rod 6 connected to the arched portion 2, a second connecting rod 7 connected to the transition portions 3, and a third connecting rod 8 connected to the vertical portions 4. All three connecting rods are made of H-beams.

[0042] The first connecting rod 6, the second connecting rod 7, and the third connecting rod 8 are all bent and inclined upwards; the support body 1 is vertically arranged along the inclination angle of the first connecting rod 6, the second connecting rod 7, and the third connecting rod 8.

[0043] After model building, the standard cross-section limits of the cross passage were determined, and the optimal oblique angle between the cross passage and the tunnel mainline was identified to ensure a safe distance between the equipment and the passage structure during the tunnel boring machine's rotation. A larger oblique angle results in a smaller cross-section for the inclined tunnel portal and lower construction risk. The coordinated design of the oblique and cross passages avoids surface roads, minimizes obstruction to surface traffic, reduces the impact on the surrounding environment, and occupies as little surface road space as possible.

[0044] In this embodiment, a channel structure was designed based on the established model. This structure is used to support the tunnel inside the excavation tunnel as the tunnel support body 1 system to ensure the safety of tunnel excavation. The support body 1 is set perpendicular to the tunnel surface, that is, the support body 1 is perpendicular to the first connecting rod 6, the second connecting rod 7 and the third connecting rod 8 to ensure the safety of tunnel excavation.

[0045] Reference Figure 4 - Figure 7 The arched part 2 and the transition part 3 are respectively connected to the first connecting rod 6 and the second connecting rod 7 via quick-release components;

[0046] The quick-release assembly includes an arc-shaped clamping plate 9; the cross-section of the clamping plate 9 is C-shaped, and fixing holes 10 are provided at both ends of the clamping plate 9. The fixing holes 10 on the clamping plate 9 correspond one-to-one with the fixing holes 10 provided on the arched part 2 and the transition part 3; the upper surface of the clamping plate 9 is provided with oppositely arranged buckle plates 11, the ends of the buckle plates 11 are bent vertically inward and fastened to the arched part 2 and the transition part 3;

[0047] The upper surface of the buckle plate 11 has a positioning hole 12, which extends to the lower surface of the clamping plate 9. The support body 1 is connected to the first connecting rod 6 and the second connecting rod 7 via a quick-release assembly, which facilitates the disassembly of the support unit and the connecting unit and enables the cyclic use of the support unit and the connecting unit. According to the model, holes are drilled at designated positions on the first connecting rod 6 and the second connecting rod 7. Then, the buckle plate 11 is fastened to the first connecting rod 6 and the second connecting rod 7. Bolts pass through the positioning hole 12 and the holes on the first connecting rod 6 and the second connecting rod 7. The bolts are tightened, and then the clamping plate 9 is fastened to the corresponding position on the support body 1 and secured to the support body 1 with bolts. When assembling the second connecting rod 7, the second connecting rods 7 on both sides of the first connecting rod 6 are assembled simultaneously to ensure the balance of the assembly. At the same time, the angle and position can be flexibly adjusted at any time during the assembly process.

[0048] Reference Figure 4 and Figure 7The card plate 9 has symmetrical rectangular holes 13 on both sides; the lower end of the buckle plate 11 has an outwardly extending portion 14, which extends through the rectangular hole 13 to the lower surface of the card plate 9, and the upper surface of the extension portion 14 is attached to the lower surface of the card plate 9; to ensure that the buckle plate 11 can be stably attached to the first connecting rod 6 and the second connecting rod 7, the buckle plate 11 is designed to be detachably installed on the card plate 9. First, the upper surface of the card plate 9 is attached to the flat part of the lower surface of the first connecting rod 6 or the second connecting rod 7, then the extension portion 14 is extended through the rectangular hole 13, and the part of the buckle plate 11 with the positioning hole 12 is attached to the inner surface of the first connecting rod 6 or the second connecting rod 7, such as... Figure 5 As shown, the bolt is then passed through the positioning hole 12 and extended to the lower surface of the clamping plate 9. The nut is tightened, and then the clamping plate 9 is fastened to the upper surface of the arched part 2. The upper surface of the arched part 2 presses against the extension 14. Then, the bolt is passed through the fixing hole 10 to fasten the clamping plate 9 to the arched part 2. The clamping plate 11 is provided with a pin to facilitate the installation of the clamping plate 11, thereby facilitating the installation of the support unit and the connecting unit.

[0049] Reference Figure 8 - Figure 14 The vertical section 4 is connected to the third connecting rod 8 via a support assembly. The support assembly includes a support plate 15, with a connecting plate 16 welded to one side of its upper surface. The connecting plate 16 has connecting holes 17, which correspond one-to-one with the connecting holes 17 on the vertical section 4. A top plate 18 is vertically fixed to the connecting plate 16, which is located above the support plate 15. Both the top plate 18 and the support plate 15 have connecting holes 17. The third connecting rod 8 is installed on the outer wall of the vertical section 4. During assembly, it differs from the first connecting rod 6 and the second connecting rod 7 in that it has an arched section 2 and a transition section 3. The support can support the first connecting rod 6 and the second connecting rod 7, but the vertical part 4 does not support the third connecting rod 8. Therefore, a support plate 15 with a support function is set up. First, the connecting plate 16 is installed on the vertical part 4. Bolts are then passed through the connecting holes 17 on the connecting plate 16 and the vertical part 4 in sequence. After that, the nuts are tightened. At this time, the support plate 15 is fixed on the vertical part 4. The third connecting rod 8 is then placed on the support plate 15. Bolts are then passed through the connecting holes 17 on the top plate 18 and the support plate 15, and also through the hole opened on the third connecting rod 8. Finally, the nuts are tightened. This makes it convenient for operators to install.

[0050] Reference Figure 10 The edge of the tray 15 is provided with an upwardly inclined anti-detachment part 19; the anti-detachment part 19 is provided on the tray 15 so that after the third connecting rod 8 is mounted on the tray 15, the swing of the third connecting rod 8 is restrained by the anti-detachment part 19, so as to prevent the third connecting rod 8 from falling off the tray 15 during the assembly process and causing a safety accident.

[0051] Reference Figure 11 - Figure 13 The support plate 15 and the vertical part 4 are fixed together by screws 20 and nuts. Both ends of the screws 20 are fitted with fixing plates 21. An extension rod 22 is fixed to the end of the fixing plate 21. The end of the extension rod 22 extends towards the inner wall of the tunnel and is fixed to a hydraulic cylinder 23. The output end of the hydraulic cylinder 23 is connected to an arc plate 24, which is pressed against the inner wall of the earthwork. The fixing plate 21 is fixed to the vertical part 4 by screws 20 and nuts. The hydraulic cylinder 23 is fixed to the vertical part 4 by the extension rod 22. The hydraulic cylinder 23 pushes the arc plate 24, which pushes against the inner wall of the tunnel to adjust the position of the support body 1 in the tunnel and achieve fine adjustment of the support body 1. Multiple hydraulic cylinders 23 operate simultaneously to achieve the overall offset of the tunnel structure and ensure the stability of the steel structure.

[0052] Reference Figure 11 - Figure 16 The end of the extension rod 22 is fixedly connected to a U-shaped push plate 25. The push plate 25 has a disc 26 on both sides, and the disc 26 is fixedly connected to the cylinder body of the hydraulic cylinder 23. After the support body 1 achieves position offset adjustment, the hydraulic cylinder 23 is removed. The hydraulic cylinder 23 is installed on the push plate 25 in an embedded manner. Through the constraint of the disc 26, the hydraulic cylinder 23 can be quickly disassembled, which facilitates the orderly progress of subsequent construction.

[0053] Reference Figure 14 - Figure 15 The push plate 25 has a notch 27 at the edge of the U-shaped opening; an elastic sheet 28 is fixed to the inner wall of the disc 26, the disc 26 is clamped on the push plate 25, and the elastic sheet 28 is pressed into the notch 27; when the hydraulic cylinder 23 is embedded in the U-shaped opening, the elastic sheet 28 is also embedded in the notch 27, stabilizing the hydraulic cylinder 23, so as to prevent the hydraulic cylinder 23 from detaching from the push plate 25 when the hydraulic cylinder 23 is in a tilted state, which would cause a safety accident.

[0054] Reference Figure 15 The hydraulic cylinder 23 has a rotating groove 29 at its output end, and the arc plate 24 is rotatably connected to the middle of its concave surface in the rotating groove 29. The arc plate 24 is rotatably connected to the hydraulic cylinder 23, which can adapt to different inclined surfaces on the inner wall of the tunnel and effectively apply the extrusion force to the inner wall of the tunnel.

[0055] Reference Figure 10 The top plate 18 has reinforcing plates 30 on both sides of its lower surface. The reinforcing plates 30 are welded between the connecting plate 16 and the top plate 18. By setting the reinforcing plates 30, the supporting strength of the top plate 18 for the third connecting rod 8 is enhanced, and the stability of the channel structure is improved.

[0056] Working principle: After model establishment, the standard cross-section clearance of the cross passage is determined, and the optimal oblique angle between the cross passage and the tunnel mainline is determined to ensure a safe distance between the equipment and the passage structure during the tunnel boring machine's rotation. The larger the oblique angle, the smaller the construction cross-section of the inclined gate, and the lower the construction risk. The coordinated design of the inclined passage and the cross passage avoids surface roads, minimizes obstruction to surface traffic, reduces the impact on the surrounding environment, and occupies as little surface road space as possible.

[0057] In this embodiment, a channel structure was designed based on the established model. This structure is used to support the tunnel inside the excavation tunnel as the tunnel support body 1 system to ensure the safety of tunnel excavation. The support body 1 is set perpendicular to the tunnel surface, that is, the support body 1 is perpendicular to the first connecting rod 6, the second connecting rod 7 and the third connecting rod 8 to ensure the safety of tunnel excavation.

[0058] The support body 1 is connected to the first connecting rod 6 and the second connecting rod 7 via quick-release components, which facilitates the disassembly of the support unit and the connecting unit and enables the cyclical use of the support unit and the connecting unit. According to the model, holes are drilled at designated positions on the first connecting rod 6 and the second connecting rod 7. Then, the clip plate 11 is fastened to the first connecting rod 6 and the second connecting rod 7. Bolts pass through the positioning hole 12 and the holes on the first connecting rod 6 and the second connecting rod 7. After tightening the bolts, the clamping plate 9 is fastened to the corresponding position on the support body 1 and fastened to the support body 1 with bolts. When assembling the second connecting rod 7, the second connecting rods 7 on both sides of the first connecting rod 6 are assembled simultaneously to ensure the balance of the assembly. At the same time, the angle and position can be flexibly adjusted at any time during the assembly process.

[0059] To ensure that the buckle plate 11 can be stably attached to the first connecting rod 6 and the second connecting rod 7, the buckle plate 11 is designed to be detachably installed on the clamping plate 9. First, the upper surface of the clamping plate 9 is attached to the flat lower surface of the first connecting rod 6 or the second connecting rod 7. Then, the extension 14 is passed through the rectangular hole 13, and the part of the buckle plate 11 with the positioning hole 12 is attached to the inner surface of the first connecting rod 6 or the second connecting rod 7. Figure 4 As shown, the bolt is then passed through the positioning hole 12 and extended to the lower surface of the clamping plate 9. The nut is tightened, and then the clamping plate 9 is fastened to the upper surface of the arched part 2. The upper surface of the arched part 2 presses against the extension 14. Then, the bolt is passed through the fixing hole 10 to fasten the clamping plate 9 to the arched part 2. The clamping plate 11 is provided with a pin to facilitate the installation of the clamping plate 11, thereby facilitating the installation of the support unit and the connecting unit.

[0060] The third connecting rod 8 is installed on the outer wall of the vertical part 4. During assembly, it differs from the first connecting rod 6 and the second connecting rod 7. While the arched part 2 and the transition part 3 can support the first connecting rod 6 and the second connecting rod 7, the vertical part 4 does not support the third connecting rod 8. Therefore, a support plate 15 with a supporting function is provided. First, the connecting plate 16 is installed on the vertical part 4. Bolts are then passed through the connecting holes 17 on the connecting plate 16 and the vertical part 4 in sequence. After tightening the nuts, the support plate 15 is fixed on the vertical part 4. The third connecting rod 8 is then placed on the support plate 15. Bolts are then passed through the connecting holes 17 on the top plate 18 and the support plate 15, and also through the holes on the third connecting rod 8. Finally, the nuts are tightened. This facilitates installation by the operator.

[0061] An anti-detachment part 19 is installed on the support plate 15. After the third connecting rod 8 is mounted on the support plate 15, the anti-detachment part 19 restrains the swing of the third connecting rod 8 to prevent the third connecting rod 8 from falling off the support plate 15 during the assembly process and causing a safety accident. The fixing plate 21 is fixed to the vertical part 4 by the screw 20 and the nut. The hydraulic cylinder 23 is fixed to the vertical part 4 by the extension rod 22. The hydraulic cylinder 23 pushes the arc plate 24, which pushes the arc plate 24 against the inner wall of the tunnel to adjust the position of the support body 1 in the tunnel and realize the fine adjustment of the support body 1. Multiple hydraulic cylinders 23 work simultaneously to realize the overall offset of the channel structure and ensure the stability of the steel structure.

[0062] After the position offset adjustment of the support body 1 is achieved, the hydraulic cylinder 23 is removed. The hydraulic cylinder 23 is installed on the push plate 25 in an embedded manner. The hydraulic cylinder 23 can be quickly disassembled by the constraint of the disc body 26, which facilitates the orderly progress of subsequent construction. The hydraulic cylinder 23 is embedded in the U-shaped opening, and the elastic plate 28 is also embedded in the notch 27 to stabilize the hydraulic cylinder 23, so as to prevent the hydraulic cylinder 23 from detaching from the push plate 25 when the hydraulic cylinder 23 is in an inclined state, which would cause a safety accident. The arc plate 24 is connected to the hydraulic cylinder 23 in a rotating manner, which can adapt to different inclined surfaces on the inner wall of the tunnel and effectively apply the extrusion force to the inner wall of the tunnel.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shield tunnel side-launching large-angle oblique cross passage structure, characterized in that: It includes a support unit and a connection unit; the support unit includes multiple support bodies (1); the support body (1) is welded from H-beams, and the support body (1) includes an arched part (2), a transition part (3) provided on both sides of the arched part (2), a vertical part (4) extending downward from both ends of the transition part (3), and a horizontal part (5) at the bottom of the vertical part (4); the connection unit includes a first connecting rod (6) connected to the arched part (2), a second connecting rod (7) connected to the transition part (3), and a third connecting rod (8) connected to the vertical part (4), and the first connecting rod (6), the second connecting rod (7) and the third connecting rod (8) are all made of H-beams; The first connecting rod (6), the second connecting rod (7) and the third connecting rod (8) are all bent and tilted upwards; the support body (1) is set vertically along the tilt angle of the first connecting rod (6), the second connecting rod (7) and the third connecting rod (8); The arched part (2) and the transition part (3) are connected to the first connecting rod (6) and the second connecting rod (7) respectively by quick-release components. The quick-release assembly includes an arc-shaped clamping plate (9); the cross-section of the clamping plate (9) is C-shaped, and fixing holes (10) are provided at both ends of the clamping plate (9). The fixing holes (10) on the clamping plate (9) correspond one-to-one with the fixing holes (10) on the arched part (2) and the transition part (3); the upper surface of the clamping plate (9) is provided with oppositely arranged buckle plates (11), the ends of the buckle plates (11) are bent vertically and fastened to the arched part (2) and the transition part (3); The upper surface of the buckle plate (11) is provided with a positioning hole (12), which extends through to the lower surface of the buckle plate (9); The card plate (9) has rectangular holes (13) symmetrically opened on both sides; the lower end of the buckle plate (11) is provided with an outward extension (14), the lower end of the buckle plate (11) passes through the rectangular hole (13) to the lower surface of the card plate (9), and the upper surface of the extension (14) is attached to the lower surface of the card plate (9). The vertical part (4) is connected to the third connecting rod (8) through a support assembly; the support assembly includes a support plate (15), a connecting plate (16) is welded to one side of the upper surface of the support plate (15), and a connecting hole (17) is opened on the connecting plate (16). The connecting holes (17) on the connecting plate (16) correspond one-to-one with the connecting holes (17) opened on the vertical part (4); the connecting plate (16) is vertically fixed to a top plate (18), the top plate (18) is located above the support plate (15), and both the top plate (18) and the support plate (15) have connecting holes (17). The edge of the tray (15) is provided with an upwardly inclined anti-detachment part (19).

2. The shield tunnel side-launching large-angle oblique cross passage structure according to claim 1, characterized in that: The support plate (15) and the vertical part (4) are fixed together by a screw (20) and a nut. Both ends of the screw (20) are fitted with fixing plates (21). An extension rod (22) is fixed to the end of the fixing plate (21). The end of the extension rod (22) extends toward the inner wall of the tunnel. A hydraulic cylinder (23) is fixed to the end of the extension rod (22). An arc plate (24) is connected to the output end of the hydraulic cylinder (23). The arc plate (24) is pressed against the inner wall of the earthwork.

3. The shield tunnel side-launching large-angle oblique cross passage structure according to claim 2, characterized in that: The end of the extension rod (22) is fixedly connected to a U-shaped push plate (25), and the push plate (25) has a disc (26) on both sides, which is fixedly connected to the cylinder body of the hydraulic cylinder (23).

4. The shield tunnel side-launching large-angle oblique cross passage structure according to claim 3, characterized in that: The push plate (25) has a notch (27) at the edge of the U-shaped opening; an elastic sheet (28) is fixed to the inner wall of the disc (26), the disc (26) is clamped on the push plate (25), and the elastic sheet (28) is squeezed into the notch (27).

5. A shield tunnel side-launching large-angle oblique cross passage structure according to claim 4, characterized in that: A rotating groove (29) is opened at the output end of the hydraulic cylinder (23), and the middle position of the concave surface of the arc plate (24) is rotatably connected in the rotating groove (29).

6. The shield tunnel side-launching large-angle oblique cross passage structure according to claim 1, characterized in that: The top plate (18) has reinforcing plates (30) on both sides of its lower surface, and the reinforcing plates (30) are welded between the connecting plate (16) and the top plate (18).

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