A shield segment

Abstract

This application discloses a tunnel segment, including a segment body with two circumferential joint ends and two longitudinal joint ends. One circumferential joint end has a recessed tenon, and the other circumferential joint end has a protruding tenon that mates with the recessed tenon. The recessed tenon has a first reinforcing member, the protruding tenon has a second reinforcing member, and each longitudinal joint end has a third reinforcing member. The first, second, and third reinforcing members are at least partially connected to the original reinforcing bars of the segment body to increase the strength of the circumferential and longitudinal joint ends. This application can enhance the structural strength at the circumferential and longitudinal joint ends, effectively reducing chipping, missing corners, and cracking at weak points such as the ends and edges of the tunnel segment. This improves the load-bearing capacity and crack resistance at the ends and edges, ensuring the integrity of the tunnel segment structure and enabling it to achieve the expected stress performance and long-term durability, thus extending its service life.

Description

Technical Field

[0001] This application relates to the field of shield tunnel segment technology, specifically a shield tunnel segment. Background Technology

[0002] With the vigorous development of infrastructure construction, more and more tunnels are being built using the shield tunneling method in railway, highway and municipal engineering projects. Shield tunnel segments are the main assembly components of shield tunneling construction. They are the innermost barrier of the tunnel and bear the responsibility of resisting soil pressure, groundwater pressure and some special loads.

[0003] Currently, the original reinforcement (conventional reinforcement) of conventional shield tunnel segments mainly consists of main reinforcement, distribution reinforcement, and tie bars. Regarding the tenon and the groove of the water-stop strip in the shield tunnel segment, the groove of the water-stop strip is generally opened on the end face of the circumferential joint or the end face of the longitudinal joint of the shield tunnel segment, and there are no specific treatment measures. During the production of shield tunnel segment reinforcement, in order to ensure the required thickness of the concrete cover for the main reinforcement and distribution reinforcement, the presence of the tenon and the groove of the water-stop strip in the shield tunnel segment often results in an excessively thick concrete cover at the convex position, leading to insufficient reinforcement in the concrete protection of that part.

[0004] During the transportation of tunnel segments, the concrete blocks at the tenon and mortise joints (ends and edges) are prone to chipping and breakage due to the lack of reinforcing steel reinforcement. During the assembly of tunnel segments by the tunnel segment assembly machine, this area is also prone to quality problems such as concrete chipping and cracking due to stress concentration and lack of reinforcing steel reinforcement, which affects the overall durability and safety of the tunnel segments.

[0005] Therefore, the structure of shield tunnel segments in the existing technology has room for further improvement. Utility Model Content

[0006] In view of this, and in response to the technical problems in the existing technology of shield tunnel segment transportation and assembly, which are prone to breakage, missing corners and cracks at the ends and edges due to stress concentration and lack of steel reinforcement, this application provides a shield tunnel segment. By setting reinforcing members between the ends and edges of the shield tunnel segment, the phenomenon of breakage, missing corners and cracks at the ends and edges of the shield tunnel segment can be effectively reduced, thereby ensuring the integrity of the shield tunnel segment structure and enabling the shield tunnel segment structure to achieve the expected stress performance and long-term durability performance.

[0007] To achieve the above objectives, this application provides the following technical solution: a tunnel segment comprising: The segment body has two circumferential seam ends and two longitudinal seam ends, one of the circumferential seam ends has a recessed tenon, and the other circumferential seam end has a protruding tenon that mates with the recessed tenon. The recessed tenon is provided with a first reinforcing member, the protruding tenon is provided with a second reinforcing member, and each longitudinal joint end is provided with a third reinforcing member; The first reinforcing member, the second reinforcing member, and the third reinforcing member are at least partially connected to the original reinforcing bars of the segment body to increase the strength of the circumferential joint end and the longitudinal joint end of the segment body.

[0008] Compared with existing technologies, by setting a first reinforcing member at the concave tenon, a second reinforcing member at the convex tenon, and a third reinforcing member at the longitudinal joint end, the structural strength at the circumferential joint end and the longitudinal joint end can be enhanced. This can effectively reduce the phenomena of chipping, missing corners, and cracking at weak points such as the ends and edges of the shield tunnel segments, thereby improving the load-bearing capacity and crack resistance at the ends and edges, ensuring the integrity of the shield tunnel segment structure, enabling the shield tunnel segment structure to achieve the expected stress performance and long-term durability performance, and extending its service life.

[0009] Preferably, each of the first reinforcing members includes a first reinforcing bar and a second reinforcing bar, the first reinforcing bar being disposed on the soil-facing side of the tenon and the second reinforcing bar being disposed on the soil-repelling side of the tenon. The first reinforcing bar and the second reinforcing bar are both connected to the original reinforcing bars of the segment body by binding or welding. The first reinforcing rib has an L-shaped structure, and the second reinforcing rib has a V-shaped structure.

[0010] In this embodiment, by setting the first reinforcing rib of the L-shaped structure and the second reinforcing rib of the V-shaped structure, the shape of the corner can be better matched, thereby more effectively dispersing and transferring stress and improving the load-bearing capacity of the part.

[0011] Preferably, the opening direction of the first reinforcing bar faces the longitudinal joint end on the soil-back side of the tenon, and the opening direction of the second reinforcing bar faces the longitudinal joint end on the soil-facing side of the tenon. Both the first reinforcing rib and the second reinforcing rib have hooks at their ends.

[0012] In this embodiment, when the straight anchorage length of the reinforcing bar is insufficient to meet the anchorage requirements, a hook is required to enhance the anchorage effect. The hook can increase the anchorage length and anchorage force between the first and second reinforcing bars and the concrete, prevent the first and second reinforcing bars from slipping or being pulled out, improve the overall strength of the shield tunnel segment structure, and ensure its safety.

[0013] Preferably, each of the second reinforcing members includes a third reinforcing rib and a fourth reinforcing rib. The third reinforcing rib is disposed at the outwardly protruding position in the middle of the tenon, and the fourth reinforcing rib is disposed on the soil-backed side of the tenon. The third reinforcing rib and the fourth reinforcing rib at least partially overlap. The third and fourth reinforcing bars are connected to the original reinforcing bars of the segment body by binding or welding. The third reinforcing rib has a U-shaped structure, and the fourth reinforcing rib has a V-shaped structure.

[0014] In this embodiment, the third reinforcing rib of the U-shaped structure can better fit the shape of the protruding part in the middle of the tenon, and the fourth reinforcing rib of the V-shaped structure can better fit the shape of the corner, thereby more effectively dispersing and transferring stress and improving the load-bearing capacity of this part.

[0015] Preferably, the opening direction of the third reinforcing bar faces the concave tenon at the circumferential joint end, and the opening direction of the fourth reinforcing bar faces the longitudinal joint end on the soil-facing side of the convex tenon. The ends of the third and fourth reinforcing bars are also provided with hooks.

[0016] In this embodiment, the hook can increase the anchorage length and anchorage force between the third and fourth reinforcing bars and the concrete, prevent the third and fourth reinforcing bars from slipping or being pulled out, improve the overall strength of the shield tunnel segment structure, and ensure its safety.

[0017] Preferably, each of the third reinforcing members includes a fifth reinforcing bar and a sixth reinforcing bar, wherein the fifth reinforcing bar is disposed on the soil-facing side of the longitudinal joint end and the sixth reinforcing bar is disposed on the soil-repelling side of the longitudinal joint end. The fifth and sixth reinforcing bars are connected to the original reinforcing bars of the segment body by binding or welding. The fifth reinforcing rib has an L-shaped structure, and the sixth reinforcing rib has a V-shaped structure.

[0018] In this embodiment, the fifth reinforcing rib of the L-shaped structure and the sixth reinforcing rib of the V-shaped structure can better fit the shape of the corner, thereby more effectively dispersing and transferring stress and improving the load-bearing capacity of this part.

[0019] Preferably, the opening direction of the fifth reinforcing bar faces the back soil side of the circumferential joint end, and the opening direction of the sixth reinforcing bar faces the soil-facing side of the circumferential joint end. The ends of the fifth and sixth reinforcing bars are also provided with hooks.

[0020] In this embodiment, the hook can increase the anchorage length and anchorage force between the fifth and sixth reinforcing bars and the concrete, prevent the fifth and sixth reinforcing bars from slipping or being pulled out, improve the overall strength of the shield tunnel segment structure, and ensure its safety.

[0021] Preferably, the distance between the outer ends of the first reinforcing member, the second reinforcing member, and the third reinforcing member and the edge of the segment body is L; Where L≥25mm.

[0022] In this embodiment, in order to ensure that the concrete protective layer covering the first reinforcing member, the second reinforcing member, and the third reinforcing member reaches a certain thickness requirement, a reasonable range of concrete protective layer values ​​is set to avoid the reinforcing members being exposed due to an excessively thin protective layer, thereby preventing steel corrosion or concrete spalling, improving their durability, and ensuring good adhesion between the reinforcing members and the concrete.

[0023] Preferably, the diameter of the reinforcing bars in the first, second, and third reinforcing members is d, the length of the hook is 3d, and the angle of the hook is 180°.

[0024] In this embodiment, when the diameter of the first reinforcing bar, the second reinforcing bar, the third reinforcing bar, the fourth reinforcing bar, the fifth reinforcing bar, and the sixth reinforcing bar is d, the length of the hook portion at its end is three times the diameter of each reinforcing bar, and the angle of the hook is 180°. That is, the end of the reinforcing bar is bent into a semi-circle to form a hook-shaped structure, which can effectively increase the bonding area and anchoring force between the reinforcing bar and the concrete.

[0025] Preferably, the circumferential and longitudinal seam ends of adjacent segments are provided with connection holes, and two adjacent segments are fixedly connected by bending bolts passing through the connection holes. The segment body has a hand hole on its arc surface, and the connection hole extends to the hand hole; the hand hole has a hand hole structural steel bar, which is at least partially connected to the third reinforcing bar and at least partially connected to the original steel bar of the segment body.

[0026] In this embodiment, by setting reinforcement bars in the handhole structure, the crack resistance and durability of the handhole area can be improved, the load-bearing capacity and rigidity of the handhole area can be strengthened, and the service life of the shield tunnel segments can be extended. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the tenon at the circumferential joint end of a tunnel segment provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the tenon at the circumferential joint end of a tunnel segment provided in an embodiment of this application; Figure 3 This is a schematic diagram of the longitudinal joint end of a shield tunnel segment provided in an embodiment of this application.

[0028] In the diagram: 1. The tunnel segment body; 11. Recessed tenon; 12. Protruding tenon; 13. Longitudinal joint end; 14. Bent bolt; 15. Handhole reinforcement; 16. Circumferential joint end reinforcement; 17. Original reinforcement; 111. First reinforcing bar; 112. Second reinforcing bar; 113. Hook; 121. Third reinforcing bar; 122. Fourth reinforcing bar; 131. Fifth reinforcing bar; 132. Sixth reinforcing bar; 171. Outer main bar; 172. Inner main bar; 173. Structural tie bar; 174. Structural reinforcement bar on the face of the segment. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0030] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0031] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0032] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 3 illustrate.

[0033] This embodiment provides a tunnel segment, which is applied in the field of tunnel segment technology, specifically, as follows: Figures 1 to 3 As shown, the tunnel segment body 1 includes two circumferential joint ends and two longitudinal joint ends 13. The longitudinal joint ends 13 are distributed along the circumferential direction of the tunnel segment ring. The circumferential joint ends are the ends of the tunnel segment body 1 in the longitudinal direction of the tunnel, that is, the ends of the tunnel segment body 1 in its own axial direction. The longitudinal joint ends 13 are the ends of the tunnel segment body 1 in its own arcuate circumferential direction. The circumferential joint ends are used to splice with adjacent tunnel segment rings, and the longitudinal joint ends 13 are used to splice with another adjacent tunnel segment body 1 to form a tunnel segment ring. One circumferential joint end is provided with a tenon 11, and the other circumferential joint end is provided with a tenon 12 that mates with the tenon 11. When adjacent tunnel segment rings are spliced, the tenon 12 of the tunnel segment body 1 is assembled with the tenon 11 in the adjacent tunnel segment ring, or the tenon 11 of the tunnel segment body 1 is assembled with the tenon 12 in the adjacent tunnel segment ring.

[0034] The number of tenons 12 and tenons 11 on the tunnel segment body 1 can be determined according to the actual engineering conditions, such as the different tunnel diameters and the segmentation of the tunnel segment rings. The tenon 11 is provided with multiple first reinforcing members, the tenon 12 is provided with multiple second reinforcing members, and each longitudinal joint end 13 is provided with multiple third reinforcing members. The first, second, and third reinforcing members are all steel bars. The first, second, and third reinforcing members are at least partially connected to the original steel bars 17 of the tunnel segment body 1. They are used to increase the strength of the circumferential joint end and the longitudinal joint end 13 of the tunnel segment body 1. This can effectively reduce the phenomenon of chipping, missing corners, and cracking at the ends and edges of the shield tunnel segment, thereby improving the load-bearing capacity and crack resistance of the ends and edges, ensuring the integrity of the shield tunnel segment structure, enabling the shield tunnel segment structure to achieve the expected stress performance and long-term durability performance, and extending its service life.

[0035] Among them, such as Figures 1 to 3 As shown, the distance between the outer ends of the first, second, and third reinforcing members and the edge of the segment body 1 is L, where L≥25mm. At the edge or end of the segment body 1, in order to ensure that the concrete protective layer covering the first, second, and third reinforcing members reaches a certain thickness requirement, a reasonable range of concrete protective layer values ​​is set to avoid the reinforcing members being exposed due to excessively thin protective layers, prevent steel corrosion or concrete spalling, improve their durability, and ensure good bonding between the reinforcing members and the concrete.

[0036] Furthermore, such as Figure 1 As shown, each first reinforcing member includes a first reinforcing rib 111 and a second reinforcing rib 112. The first reinforcing rib 111 is located on the soil-facing side of the tenon 11 at the corner of the soil-facing edge; the second reinforcing rib 112 is located on the soil-repelling side of the tenon 11 at the corner of the soil-repelling edge. This can improve or enhance the load-bearing capacity, crack resistance and structural strength of the corner of the tenon 11, and reduce the damage caused by stress during assembly or transportation. The first reinforcing bar 111 and the second reinforcing bar 112 are both connected to the original reinforcing bars 17 of the tunnel segment body 1 by binding or welding. The first reinforcing bar 111 is an L-shaped structure with equal dimensions on both sides, or the dimension of the side closer to the second reinforcing bar 112 is smaller than the dimension of the other side. It can also be designed according to the stress analysis of the shield tunnel segment on site. The sixth reinforcing bar 132 is a V-shaped structure, and the second reinforcing bar 112 is a V-shaped structure. The L-shaped first reinforcing bar 111 and the V-shaped second reinforcing bar 112 can better fit the shape of the corner, thereby more effectively dispersing and transferring stress and improving the bearing capacity of this part.

[0037] The opening of the first reinforcing bar 111 faces the longitudinal joint end 13 on the soil-back side of the tenon 11, and the opening of the second reinforcing bar 112 faces the longitudinal joint end 13 on the soil-facing side of the tenon 11. Both the first reinforcing bar 111 and the second reinforcing bar 112 are provided with hooks 113 at their ends. When the straight anchorage length of the reinforcing bar is insufficient to meet the anchorage requirements, hooks 113 are used to enhance the anchorage effect. The hooks 113 can increase the anchorage length and anchorage force between the first reinforcing bar 111 and the second reinforcing bar 112 and the concrete, prevent the first reinforcing bar 111 and the second reinforcing bar 112 from slipping or being pulled out, improve the overall strength of the shield tunnel segment structure, and ensure its safety.

[0038] Furthermore, such as Figure 2 As shown, each second reinforcing member includes a third reinforcing rib 121 and a fourth reinforcing rib 122. The third reinforcing rib 121 is located at the outward protrusion of the middle part of the tenon 12. The third reinforcing rib 121 corresponds to the outward protrusion of the middle part of the tenon 12, which can enhance the stability of the protruding part under stress and prevent it from being damaged due to stress concentration. The fourth reinforcing rib 122 is located on the soil-backed side of the tenon 12 at the corner of the edge of the soil-backed side. It can improve or enhance the load-bearing capacity, crack resistance and structural strength of the corner of the tenon 12, and reduce the damage caused by stress during assembly or transportation. The third reinforcing rib 121 and the fourth reinforcing rib 122 overlap at least partially, further enhancing the stability between them. Both the third reinforcing rib 121 and the fourth reinforcing rib 122 are connected to the original reinforcing bars 17 of the segment body 1 by binding or welding. The third reinforcing rib 121 has a U-shaped structure, and the fourth reinforcing rib 122 has a V-shaped structure. The U-shaped third reinforcing rib 121 can better fit the shape of the protruding part in the middle of the tenon 12, and the V-shaped fourth reinforcing rib 122 can better fit the shape of the corner, thereby more effectively dispersing and transferring stress and improving the load-bearing capacity of this part.

[0039] The third reinforcing bar 121 has its opening facing the recessed tenon 11 at the circumferential joint end, and the fourth reinforcing bar 122 has its opening facing the longitudinal joint end 13 on the soil-facing side of the protruding tenon 12. The ends of the third reinforcing bar 121 and the fourth reinforcing bar 122 are also provided with hooks 113. The hooks 113 can increase the anchorage length and anchorage force between the third reinforcing bar 121 and the fourth reinforcing bar 122 and the concrete, prevent the third reinforcing bar 121 and the fourth reinforcing bar 122 from slipping or being pulled out, improve the overall strength of the shield tunnel segment structure, and ensure its safety.

[0040] Furthermore, such as Figure 3As shown, each third reinforcing member includes a fifth reinforcing bar 131 and a sixth reinforcing bar 132. The fifth reinforcing bar 131 is located on the soil-facing side of the longitudinal joint end 13, at the corner of the soil-facing edge. The sixth reinforcing bar 132 is located on the soil-repellent side of the longitudinal joint end 13, at the corner of the soil-repellent edge. This improves or enhances the bearing capacity, crack resistance, and structural strength of the corner of the longitudinal joint end 13, reducing damage caused by stress during assembly or transportation. Both the fifth reinforcing bar 131 and the sixth reinforcing bar 132 are connected to the original reinforcing bars 17 of the segment body 1 by binding or welding, ensuring a firm connection between the third reinforcing member and the segment body 1. The fifth reinforcing rib 131 is an L-shaped structure with equal dimensions on both sides, or the side closest to the sixth reinforcing rib 132 is smaller than the other side. Alternatively, it can be designed based on the stress conditions of the tunnel segments on site. The sixth reinforcing rib 132 is a V-shaped structure. The L-shaped fifth reinforcing rib 131 and the V-shaped sixth reinforcing rib 132 can better fit the shape of the corner, thereby more effectively dispersing and transferring stress and improving the load-bearing capacity of this part.

[0041] The fifth reinforcing bar 131 has its opening facing the back side of the circumferential joint, while the sixth reinforcing bar 132 has its opening facing the front side of the circumferential joint. The ends of the fifth reinforcing bar 131 and the sixth reinforcing bar 132 are also provided with hooks 113. The hooks 113 can increase the anchorage length and anchorage force between the fifth reinforcing bar 131 and the sixth reinforcing bar 132 and the concrete, prevent the fifth reinforcing bar 131 and the sixth reinforcing bar 132 from slipping or being pulled out, improve the overall strength of the shield tunnel segment structure, and ensure its safety.

[0042] Furthermore, such as Figures 1 to 3 As shown, the diameter of the reinforcing bars in the first, second, and third reinforcing members is d, the length of the hook 113 is 3d, and the angle of the hook 113 is 180°. That is to say, when the diameter of the first reinforcing bar 111, the second reinforcing bar 112, the third reinforcing bar 121, the fourth reinforcing bar 122, the fifth reinforcing bar 131, and the sixth reinforcing bar 132 is d, the length of the hook 113 at its end is three times the diameter of each reinforcing bar, and the angle of the hook 113 is 180°. That is, the end of the reinforcing bar is bent into a semi-circle to form a hook-shaped structure, which can effectively increase the bonding area and anchorage force between the reinforcing bar and the concrete.

[0043] Furthermore, such as Figures 1 to 3As shown, the tenon 11 at the circumferential joint end is also provided with a plurality of circumferential joint end structural steel bars 16. The plurality of circumferential joint end structural steel bars 16 are arranged at intervals according to design requirements. The circumferential joint end structural steel bars 16 are set between the original steel bars 17 of the first reinforcing member and the segment body 1. The circumferential joint end structural steel bars 16 are connected to the first reinforcing member by binding or welding, which can increase the connection strength between the first reinforcing member and the segment body 1, and at the same time prevent cracking at the position between two adjacent segments.

[0044] The adjacent tunnel segments 1 have connecting holes at both the circumferential and longitudinal joint ends 13. Two adjacent tunnel segments 1 are fixedly connected by bent bolts 14 passing through these connecting holes. The bent bolts 14 effectively resist tensile and shear forces, preventing relative displacement of the tunnel segments under external forces. Handholes are provided on the arc surface of the tunnel segment 1, with the connecting holes extending to them. Handhole structural reinforcement 15 is installed within the handholes, at least partially connected to the third reinforcing bar 121. The handhole structural reinforcement 15 is also at least partially connected to the original reinforcement 17 of the tunnel segment 1. This improves the crack resistance and durability of the handhole area, strengthens its load-bearing capacity and rigidity, and extends the service life of the tunnel segments. The assembly process involves connecting the segment bodies 1 through the longitudinal joint end 13 to form segment rings (generally, 6 to 8 segment bodies 1 are connected to form segment rings through handholes using bent bolts 14), and then connecting the segment rings to each other through the ring joint end (the segment rings are connected to each other through handholes using bent bolts 14) to form a complete tunnel.

[0045] like Figures 1 to 3 As shown, the original reinforcement 17 of the segment body 1 includes the outer main reinforcement 171 set on the soil-facing side, the inner main reinforcement 172 set on the soil-repelling side, the structural tie 173 located between the outer main reinforcement 171 and the inner main reinforcement 172, and the segment face structural reinforcement 174 set on the surface area of ​​the segment body 1, etc. Each reinforcement has a special function, which is a general construction practice and will not be described in detail.

[0046] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A type of tunnel segment, characterized in that, include: The tube body (1) has two circumferential joint ends and two longitudinal joint ends (13), one of the circumferential joint ends has a tenon (11) and the other circumferential joint end has a tenon (12) that cooperates with the tenon (11). The recessed tenon (11) is provided with a plurality of first reinforcing members, the protruding tenon (12) is provided with a plurality of second reinforcing members, and each longitudinal seam end (13) is provided with a plurality of third reinforcing members. The first reinforcing member, the second reinforcing member, and the third reinforcing member are at least partially connected to the original reinforcing bars (17) of the segment body (1) to increase the strength of the circumferential joint end and the longitudinal joint end (13) of the segment body (1).

2. The shield tunnel segment according to claim 1, characterized in that, Each of the first reinforcing members includes a first reinforcing bar (111) and a second reinforcing bar (112). The first reinforcing bar (111) is disposed on the soil-facing side of the tenon (11), and the second reinforcing bar (112) is disposed on the soil-repelling side of the tenon (11). The first reinforcing bar (111) and the second reinforcing bar (112) are both connected to the original reinforcing bars (17) of the segment body (1) by binding or welding; The first reinforcing rib (111) is an L-shaped structure, and the second reinforcing rib (112) is a V-shaped structure.

3. The shield tunnel segment according to claim 2, characterized in that, The opening direction of the first reinforcing bar (111) is towards the longitudinal joint end (13) on the soil-back side of the tenon (11), and the opening direction of the second reinforcing bar (112) is towards the longitudinal joint end (13) on the soil-facing side of the tenon (11). The ends of the first reinforcing rib (111) and the second reinforcing rib (112) are both provided with hooks (113).

4. The shield tunnel segment according to claim 1, characterized in that, Each of the second reinforcing members includes a third reinforcing bar (121) and a fourth reinforcing bar (122). The third reinforcing bar (121) is located at the center of the protruding part (12) and the fourth reinforcing bar (122) is located on the soil-backed side of the protruding part (12). The third reinforcing bar (121) and the fourth reinforcing bar (122) at least partially overlap. The third reinforcing bar (121) and the fourth reinforcing bar (122) are connected to the original reinforcing bars (17) of the segment body (1) by binding or welding. The third reinforcing rib (121) has a U-shaped structure, and the fourth reinforcing rib (122) has a V-shaped structure.

5. The shield tunnel segment according to claim 4, characterized in that, The opening direction of the third reinforcing bar (121) is towards the concave tenon (11) at the circumferential joint end, and the opening direction of the fourth reinforcing bar (122) is towards the longitudinal joint end (13) on the soil-facing side of the convex tenon (12). The ends of the third reinforcing rib (121) and the fourth reinforcing rib (122) are also provided with hooks (113).

6. The shield tunnel segment according to claim 1, characterized in that, Each of the third reinforcing members includes a fifth reinforcing bar (131) and a sixth reinforcing bar (132), wherein the fifth reinforcing bar (131) is disposed on the soil-facing side of the longitudinal joint end (13) and the sixth reinforcing bar (132) is disposed on the soil-repelling side of the longitudinal joint end (13); The fifth reinforcing bar (131) and the sixth reinforcing bar (132) are connected to the original reinforcing bars (17) of the segment body (1) by binding or welding. The fifth reinforcing rib (131) has an L-shaped structure, and the sixth reinforcing rib (132) has a V-shaped structure.

7. The shield tunnel segment according to claim 6, characterized in that, The opening direction of the fifth reinforcing bar (131) is towards the back soil side of the circumferential joint end, and the opening direction of the sixth reinforcing bar (132) is towards the soil-facing side of the circumferential joint end. The ends of the fifth reinforcing bar (131) and the sixth reinforcing bar (132) are also provided with hooks (113).

8. The tunnel segment according to claim 1, characterized in that, The distance between the outer ends of the first reinforcing member, the second reinforcing member, and the third reinforcing member and the edge of the segment body (1) is L; Where L≥25mm.

9. The tunnel segment according to claim 3, characterized in that, The diameter of the reinforcing bars of the first reinforcing member, the second reinforcing member, and the third reinforcing member is d, the length of the hook (113) is 3d, and the angle of the hook (113) is 180°.

10. The tunnel segment according to claim 4, characterized in that, The circumferential and longitudinal seam ends (13) of the adjacent segment bodies (1) are provided with connection holes, and the two adjacent segment bodies (1) are fixedly connected by bending bolts (14) passing through the connection holes. The segment body (1) has a hand hole on its arc surface. The connecting hole extends to the hand hole. The hand hole has a hand hole structural steel bar (15). The hand hole steel bar is at least partially connected to the third reinforcing bar (121) and at least partially connected to the original steel bar (17) of the segment body (1).

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