Compression-expansion self-locking type shield segment connecting device

Abstract

The invention relates to the technical field of shield segment connection, in particular to a compression-expansion self-locking type shield segment connecting device. A cylindrical receiving groove is formed in the end face of one end of a female head of the compression-expansion self-locking type shield segment connecting device, and a limiting groove is formed in the inner circumferential face of the receiving groove; the end part of the male head is provided with a cylindrical insertion end, the insertion end is matched with the receiving groove, and the end surface of the insertion end is provided with a cylindrical hollow groove; a cushion block and an elastic expansion body are arranged in the hollow groove, and the sum of the axial lengths of the cushion block and the elastic expansion body is larger than that of the hollow groove; a plurality of mounting grooves are formed in the peripheral surface of the insertion end, each mounting groove is communicated with the hollow groove, a limiting block is arranged in each mounting groove, the limiting blocks are opposite to the elastic expansion bodies in position, and the axial length of the mounting grooves is smaller than or equal to that of the limiting grooves; after the insertion end is inserted into the receiving groove, the female head and the male head are coaxially arranged, and the limiting block is opposite to the limiting groove. The connecting structure has the beneficial effects that the connecting process is simple, the construction efficiency is high, compression expansion self-locking can be achieved, connection is firm, the connecting structure is suitable for annular and longitudinal connection, and the adaptation degree is high.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel segment connection technology, and specifically to a compressive expansion self-locking shield tunnel segment connection device. Background Technology

[0002] As the core assembly component in shield tunnel construction, the tunnel segment is the innermost permanent lining structure of the tunnel. A complete ring of segment lining typically consists of one capping block, two adjacent blocks, and three standard blocks. Rings are joined together using either continuous joints or staggered joints. From the perspective of connection direction, the joints between segments can be divided into longitudinal connections along the tunnel's longitudinal axis and circumferential connections perpendicular to the longitudinal axis. Both connection methods work together to ensure the integrity of the segment structure.

[0003] During the construction and operation of shield tunnels, the segment joints are the weakest link in the structural stress, and their connection quality directly affects the tunnel's impermeability, durability, and seismic resistance. Currently, mainstream segment connection technologies both domestically and internationally exhibit diverse characteristics, mainly including bent bolt joints, straight bolt joints, multi-bolt joints, insert joints, pin joints, and TA-SRING joints. For example, patent CN116906078A discloses a novel circumferential joint shield tunnel segment structure, whose circumferential joint includes a straight quick-connect component and two sleeves pre-embedded in the tenon and convex tenon respectively; the quick-connect component includes a body and two screws extending straight from both ends of the body. In use, one screw of the quick-connect component is screwed into the sleeve pre-embedded in the convex tenon, and with the assistance of an assembly machine, the other screw is aligned with the sleeve pre-embedded in the tenon and pressed.

[0004] However, on the one hand, the above technical solution still requires the quick connector to be screwed, which reduces construction efficiency. On the other hand, after extrusion, the two screws and their respective sleeves are limited in the axial direction of the screws by the friction between the external thread and the inner wall of the sleeve. The stability is poor, which poses a potential risk to the durability and safe operation of the tunnel. Third, it is only suitable for circumferential connection and cannot take into account the longitudinal connection requirements of the tunnel segments, which means that tunnel construction needs to be equipped with two different connection devices for circumferential and longitudinal directions at the same time. Summary of the Invention

[0005] To address the problems in existing shield tunnel segment connection structures, which require screwing during use, resulting in low construction efficiency, and rely solely on the friction between two screws and their respective sleeves for axial positioning after assembly, leading to poor stability and the inability to simultaneously meet the circumferential and longitudinal connection requirements of the segments, thus necessitating the simultaneous use of two different connection devices for circumferential and longitudinal directions during tunnel construction, this invention provides a pressure-expanding self-locking shield tunnel segment connection device.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A pressure-expanding self-locking shield tunnel segment connection device includes a female head and a male head, both of which are cylindrical structures. The female head has a cylindrical receiving groove at the center of its end face, and a limiting groove is provided on the inner circumference of the receiving groove. The male head has a cylindrical insertion end at its end center, the outer diameter of which matches the inner diameter of the receiving groove, and a cylindrical hollow groove at the center of its end face. A pad and an elastic expansion body are coaxially arranged within the hollow groove. The elastic expansion body is closer to the male head in distance than the pad. The axial length of the pad... and the axial length of the elastic expansion body The sum is greater than the axial length of the hollow groove. The outer circumferential surface of the insertion end has several mounting grooves arranged along the circumferential direction of the insertion end. Each mounting groove is connected to the hollow groove. Each mounting groove contains a limiting block, the position of which is opposite to the position of the elastic expansion body. The radial dimension A of the limiting block is greater than the radial dimension B of the limiting groove. The axial length of the mounting groove is... Less than or equal to the axial length of the limiting groove After the insertion end is inserted into the receiving slot, the female and male heads are set coaxially, and the position of the limiting block is opposite to the position of the limiting slot.

[0007] With the above structural design, firstly, during connection, only the insertion end of the male connector needs to be inserted into the receiving slot of the female connector. There is no need for manual twisting of the male connector during the connection process, reducing operation steps, shortening the time spent on a single connection, and improving the overall efficiency of segment assembly. With the help of a robotic arm, the assembled segment is brought close to the installed segment, and the male and female connectors are aligned and pressed together to achieve mechanized and automated assembly, realizing an integrated operation from positioning to fastening, further improving construction efficiency and connection reliability.

[0008] Secondly, after the insertion end is inserted into the receiving slot, because the total axial length of the pad and the elastic expansion body is greater than the length of the hollow slot, the elastic expansion body is axially compressed to generate radial expansion force, which pushes the limiting block to move out of the installation slot. Finally, part of the limiting block is still in the installation slot, and the other part is stuck in the limiting slot in the receiving slot. The elastic expansion body provides continuous expansion force to ensure that the limiting block has no loose gap in the radial direction. The engagement of the limiting block can effectively limit the relative movement of the female head and the male head along the axial direction, realize compressive expansion self-locking, improve connection stability, and thus realize a tight connection between shield tunnel segments, reducing tunnel operation risks.

[0009] Third, the female and male connectors are straight connections, which can be flexibly applied to the circumferential and longitudinal connections of the tunnel segments. It only requires the two adjacent circumferential or longitudinal tunnel segments to have a straight opening based on the pre-embedded positions of the female and male connectors. Compared with the existing technology that requires the reservation of complex arc-shaped holes for circumferential connections, the processing requirements are lower, the tunnel segments are less prone to cracking, and it avoids the disadvantages of bending bolts being difficult to insert between tunnel segments and the tunnel segments being easily damaged by auxiliary insertion methods such as vibration and hammering.

[0010] As a preferred implementation of a compression-inflating self-locking shield tunnel segment connection device, one end of the male connector is provided with an insertion end, and the outer circumferential surface of the male connector is provided with an external thread, the axial length of the insertion end is... Equal to the axial length of the receiving slot Alternatively, the male connector has insertion ends at both ends, with its outer diameter matching the inner diameter of the receiving groove, and its axial length... and the axial length of the two insertion ends The sum equals the axial length of the receiving groove. Twice as much.

[0011] Using the above structural design, when the male end has an insertion end, the axial length of the insertion end is... Equal to the axial length of the receiving slot This design ensures a perfect fit between the insertion end and the receiving slot. The male connector also features external threads on its outer circumference, facilitating its embedding into the tunnel segment. This design is suitable for unidirectional tunnel segment connections. When both ends of the male connector have insertion ends, the axial length of the male connector... Axial length of the two insertion ends The sum equals the axial length of the receiving slot. Twice the size, it can connect two female heads simultaneously to achieve continuous splicing of multiple segments, and is especially suitable for multi-node connection in the process of segment ring formation.

[0012] As a preferred implementation of a compression-expansion self-locking shield tunnel segment connection device, the outer circumferential surface of the female head is provided with external threads.

[0013] With the above structural design, the outer circumferential surface of the female head is provided with external threads, which facilitates the pre-embedding of the female head into the segment and improves the firmness of the connection between the female head and the segment.

[0014] As a preferred implementation of a compression-inflating self-locking shield tunnel segment connection device, the female head, male head, receiving slot, insertion end, hollow slot, pad block and elastic expansion body are all cylindrical.

[0015] With the above structural design, all core components are cylindrical. The cylindrical structure has symmetrical characteristics, which allows external forces to be evenly distributed among the components during the transmission of force through the tunnel segments, preventing localized stress concentration that could lead to component damage and extending the service life of the device. Secondly, the cylindrical structure is a common and easily machined form, reducing the processing difficulty and cost of components such as female connectors, male connectors, and spacers. Furthermore, cylindrical components do not require precise angle alignment during installation; only coaxiality needs to be ensured, simplifying the installation process.

[0016] As a preferred implementation of a compressive self-locking shield tunnel segment connection device, the axial length of the mounting groove... Equal to the axial length of the limiting groove .

[0017] With the above structural design, when the limiting block is inserted into the limiting groove, the limiting block can completely fill the limiting groove in the axial direction, preventing the limiting block from moving axially within the limiting groove, further optimizing the self-locking effect, ensuring the positional stability in the axial direction after the segment connection, and reducing the risk of connection loosening due to component gaps.

[0018] As a preferred implementation of a compression-inflating self-locking shield tunnel segment connection device, several mounting slots are evenly arranged along the circumferential direction of the insertion end.

[0019] With the above structural design, the mounting slots are evenly distributed around the insertion end, ensuring a uniform distribution of the limiting blocks. When the elastic expansion body pushes the limiting blocks out, the evenly distributed limiting blocks can simultaneously engage with the limiting slots from multiple directions around the insertion end, ensuring a force balance between the insertion end and the receiving slot. This prevents excessive local stress caused by uneven distribution of the limiting blocks, which could lead to deformation of the insertion end or the receiving slot.

[0020] As a preferred implementation of a compression-inflating self-locking shield tunnel segment connection device, the axis of the female head is perpendicular to the splicing surface of the shield tunnel segment.

[0021] With the above structural design, the centerline of the female head is perpendicular to the splicing surface of the segment, eliminating the need to reserve complex-shaped holes on the splicing surface of the segment. A flat, straight opening can be reserved according to the shape of the female head, making it easy to process.

[0022] In a preferred implementation of a compression-expansion self-locking shield tunnel segment connection device, the pad is made of metal.

[0023] Using the above structural design, the metal has high strength and rigidity, allowing the pad to withstand significant compressive force without easily deforming when inserted into the receiving slot at the insertion end. Furthermore, compared to other materials, the metal pad can reliably transfer the compressive force to the elastic expansion body, ensuring that the elastic expansion body generates sufficient expansion force to push the limiting block into the limiting slot, guaranteeing reliable triggering of the self-locking structure and preventing self-locking failure due to pad deformation.

[0024] The beneficial effects of this invention include: First, during connection, only the insertion end of the male connector needs to be inserted into the receiving slot of the female connector. There is no need for manual twisting of the male connector during the connection process, reducing operation steps, shortening the time spent on a single connection, and improving the overall efficiency of segment assembly. With the help of a robotic arm, the assembled segment is brought close to the installed segment, and the male and female connectors are aligned and pressed together to achieve mechanized and automated assembly, realizing an integrated operation from positioning to fastening, further improving construction efficiency and connection reliability.

[0025] Secondly, after the insertion end is inserted into the receiving slot, because the total axial length of the pad and the elastic expansion body is greater than the length of the hollow slot, the elastic expansion body is axially compressed to generate radial expansion force, which pushes the limiting block to move out of the installation slot. Finally, part of the limiting block is still in the installation slot, and the other part is stuck in the limiting slot in the receiving slot. The elastic expansion body provides continuous expansion force to ensure that the limiting block has no loose gap in the radial direction. The engagement of the limiting block can effectively limit the relative movement of the female head and the male head along the axial direction, realize compressive expansion self-locking, improve connection stability, and thus realize a tight connection between shield tunnel segments, reducing tunnel operation risks.

[0026] Third, the female and male connectors are straight connections, which can be flexibly applied to the circumferential and longitudinal connections of the tunnel segments. It only requires the two adjacent circumferential or longitudinal tunnel segments to have a straight opening based on the pre-embedded positions of the female and male connectors. Compared with the existing technology that requires the reservation of complex arc-shaped holes for circumferential connections, the processing requirements are lower, the tunnel segments are less prone to cracking, and it avoids the disadvantages of bending bolts being difficult to insert between tunnel segments and the tunnel segments being easily damaged by auxiliary insertion methods such as vibration and hammering. Attached Figure Description

[0027] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural schematic diagram of a compression-expansion self-locking shield tunnel segment connection device according to a specific embodiment of the present invention; Figure 2This is a half-sectional structural diagram of a compression-expansion self-locking shield tunnel segment connection device according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the structure when the female and male heads are axially aligned in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the structure when the insertion end is inserted into the receiving slot in a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the structure when the female and male heads are locked together in a specific embodiment of the present invention; Figure 6 This is a schematic diagram of a specific embodiment of the present invention, showing that both ends of the male connector have insertion ends.

[0029] List of components and reference numerals: 1. Female connector; 11. Receiving slot; 12. Limiting slot; 2. Male head; 3. Insertion end; 31. Hollow groove; 32. Mounting groove; 4. Pad; 5. Elastic expansion body; 6. Limiting block. Detailed Implementation

[0030] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Reference Figure 1 and Figure 2 This embodiment proposes a compressive self-locking shield tunnel segment connection device, including a female head 1 and a male head 2. Both the female head 1 and the male head 2 are cylindrical structures. The outer circumferential surface of the female head 1 is provided with external threads, and the center of the end face of one end of the female head 1 is provided with a cylindrical receiving groove 11. The inner circumferential surface of the receiving groove 11 is provided with a limiting groove 12. The female head 1 is pre-embedded in the shield tunnel segment, and the axis of the female head 1 is perpendicular to the splicing surface of the shield tunnel segment.

[0032] The male connector 2 has a cylindrical insertion end 3 at its center. The outer circumference of the insertion end 3 is smooth, and its outer diameter matches the inner diameter of the receiving groove 11. A cylindrical hollow groove 31 is located at the center of the end face of the insertion end 3. A coaxially arranged cylindrical pad 4 and elastic expansion body 5 are located within the hollow groove 31. The pad 4 is made of metal, and the elastic expansion body 5 expands under pressure. The elastic expansion body 5 can be made of expanding resin or rubber, etc. The elastic expansion body 5 is closer to the male connector 2 than the pad 4. The axial length of the pad 4... and the axial length of the elastic expansion body 5 The sum is greater than the axial length of the hollow groove 31. The outer circumferential surface of the insertion end 3 is provided with several mounting grooves 32 evenly arranged along the circumferential direction of the insertion end 3. Each mounting groove 32 is connected to the hollow groove 31. Each mounting groove 32 is provided with a limiting block 6. The position of the limiting block 6 is opposite to the position of the elastic expansion body 5. The radial dimension A of the limiting block 6 is larger than the radial dimension B of the limiting groove 12. The axial length of the mounting groove 32 is... The axial length of the limiting groove 12 is less than or equal to After the insertion end 3 is inserted into the receiving slot 11, the female head 1 and the male head 2 are set coaxially, and the position of the limiting block 6 is opposite to the position of the limiting slot 12.

[0033] This embodiment is applicable to both unidirectional segment connections and continuous splicing of multiple segments. When used for unidirectional segment connections, one end of the male connector 2 is provided with an insertion end 3, the axial length of which is... Equal to the axial length of receiving slot 11 This ensures that the insertion end 3 and the receiving groove 11 are completely fitted together. Simultaneously, the outer circumferential surface of the male connector 2 is provided with external threads, facilitating the pre-embedding of the male connector 2 into the tube segment. (Refer to...) Figure 6 When used for continuous splicing of multiple tube segments, both ends of the male connector 2 are provided with insertion ends 3. The outer diameter of the male connector 2 is adapted to the inner diameter of the receiving groove 11, and the axial length of the male connector 2 is... and the axial length of the two insertion ends 3 The sum is equal to the axial length of the receiving slot 11. Twice the size of the male connector 2, which can connect two female connectors 1 simultaneously, making it particularly suitable for multi-node connections during the segment ring formation process.

[0034] Work process: 1. Pre-embedded positioning: The female connector 1 is pre-embedded into a pre-set hole in a shield tunnel segment. The external thread on the outer circumference of the female connector 1 enhances the connection strength with the segment, and the axis of the female connector 1 must be perpendicular to the segment splicing surface to ensure accurate subsequent docking. The corresponding male connector 2 is selected according to the connection requirements. If only one-sided connection of two adjacent segments is required, the non-insertion end 3 of the male connector 2 with only one end of the insertion end 3 is pre-embedded into another segment to ensure that the male connector 2 will not be displaced within the segment, and that the insertion end 3 can extend smoothly out of the segment splicing surface for easy docking with the female connector 1. If continuous splicing of multiple segments is required, such as in the multi-node connection scenario during the segment ring formation process, the male connector 2 with insertion ends 3 at both ends is placed between the two segments to be connected, so that the insertion ends 3 at both ends can be aligned with the female connector 1 in the pre-set holes in the two segments respectively, ensuring that the subsequent insertion and docking work can be carried out smoothly.

[0035] 2. Insert docking: Reference Figure 3 and Figure 4 With the help of specialized robotic arms or segment assembly equipment, operators control the robotic arms or assembly equipment through the equipment's control system to slowly move the tunnel segment to be connected closer to the already installed and fixed tunnel segment. During the movement, the relative positions of the female connector 1 and the male connector 2 need to be monitored in real time using high-definition cameras and positioning sensors on the equipment. Based on the monitoring data, the position and angle of the segment to be connected are finely adjusted to ensure that the insertion end 3 on the male connector 2 can be accurately aligned with the receiving slot 11 of the female connector 1.

[0036] Once the insertion end 3 is initially aligned with the receiving groove 11, continue to slowly push the tube segment to be connected, allowing the insertion end 3 of the male connector 2 to gradually enter the receiving groove 11 of the female connector 1. During insertion, since the outer circumference of the insertion end 3 is smooth and its outer diameter matches the inner diameter of the receiving groove 11, the insertion can proceed smoothly without the need for tightening. During this process, the operator must closely monitor the smoothness of the insertion. If excessive resistance is encountered, the insertion should be stopped immediately, and the insertion end 3 and receiving groove 11 should be checked for positional deviations or blockages. After troubleshooting, the insertion operation should continue until the insertion end 3 is fully inside the receiving groove 11, at which point the end face of the insertion end 3 is tightly fitted with the bottom of the receiving groove 11, and the insertion and docking work is complete.

[0037] 3. Expansion by compression: After the insertion end 3 is fully inserted into the receiving slot 11, a compression expansion operation is required to achieve subsequent self-locking. Axial pressure is continuously applied to the shield tunnel segment to be connected using a robotic arm or assembly equipment. This pressure is transmitted through the segment to the insertion end 3 of the male connector 2, causing the bottom of the receiving slot 11 of the female connector 1 to contact the pad 4 inside the insertion end 3 of the male connector 2, resulting in a compression effect. During the compression process, the pad 4 is subjected to the axial force applied from the bottom of the receiving slot 11, and this compression force is evenly transmitted to the elastic expansion body 5 located on one side. After being subjected to axial compression, the elastic expansion body 5 deforms. Due to the restriction of the inner wall of the hollow slot 31, the elastic expansion body 5 cannot continue to extend in the axial direction, thus generating an expansion force in the radial direction. During this process, the magnitude of the applied axial pressure must be controlled to ensure that the elastic expansion body 5 can generate sufficient radial expansion force.

[0038] 4. Self-locking fixation: Reference Figure 5As the radial expansion force of the elastic expansion body 5 increases, this force acts on the limiting block 6 within the mounting groove 32 on the outer circumferential surface of the insertion end 3, pushing the limiting block 6 to move away from the axis of the insertion end 3 along the mounting groove 32, i.e., outward from the mounting groove 32. Since the position of the limiting block 6 is opposite to that of the elastic expansion body 5, and the mounting groove 32 is connected to the hollow groove 31, the elastic expansion body 5 can directly transmit the expansion force to the limiting block 6. During the movement of the limiting block 6, a portion of it remains within the mounting groove 32, while the other portion gradually engages with the limiting groove 12 on the inner circumferential surface of the receiving groove 11 of the female head 1. Because the radial dimension A of the limiting block 6 is larger than the radial dimension B of the limiting groove 12, the limiting block 6 achieves a tight engagement after engaging with the limiting groove 12, effectively preventing the limiting block 6 from dislodging from the limiting groove 12. Simultaneously, the elastic expansion body 5 continuously provides radial expansion force after being compressed. This force ensures that the limiting block 6 remains in close contact with the inner wall of the limiting groove 12, guaranteeing that there is no loosening gap in the radial direction. Furthermore, the axial length of the mounting groove 32 is less than or equal to the axial length of the limiting groove 12. In this embodiment, the axial length of the mounting groove 32 is equal to the axial length of the limiting groove 12, allowing the limiting block 6 to completely fill the limiting groove 12 in the axial direction after being inserted, preventing axial movement of the limiting block 6 within the limiting groove 12. Through the above process, the compressive expansion self-locking of the female head 1 and the male head 2 is ultimately achieved, thereby completing the firm connection of the two shield tunnel segments and effectively reducing the risk caused by loose segment connections during tunnel operation.

[0039] From pre-embedded positioning to self-locking fixing, the entire connection process eliminates the need for manual tightening of the male connector 2, significantly reducing operational steps, shortening the time required for single-segment connection, and substantially improving the overall efficiency of shield tunnel segment assembly. Simultaneously, the use of robotic arms or assembly equipment enables mechanized and automated assembly, further enhancing construction efficiency and the reliability of segment connections. Furthermore, the female connector 1 and male connector 2 of this device employ a straight connection method, which can be flexibly applied to circumferential and longitudinal connections of tunnel segments. Only flat, direct openings need to be designed on two adjacent circumferential or longitudinal segments according to the pre-embedded positions of the female connector 1 and male connector 2. Compared to the existing technology that requires reserving complex arc-shaped holes for circumferential connections, this reduces the processing requirements for tunnel segments, decreases the possibility of cracking during processing, and avoids the disadvantages of using bent bolts, such as difficulty in inserting bent bolts between segments, and the potential damage to tunnel segments caused by vibration, hammering, or other auxiliary insertion methods.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure-expanding self-locking shield tunnel segment connection device, comprising a female connector (1) and a male connector (2), characterized in that, Both the female head (1) and the male head (2) are cylindrical structures. The center of the end face of one end of the female head (1) is provided with a cylindrical receiving groove (11), and the inner circumferential surface of the receiving groove (11) is provided with a limiting groove (12). The male connector (2) has a cylindrical insertion end (3) at its center. The outer diameter of the insertion end (3) is matched with the inner diameter of the receiving groove (11). The center of the end face of the insertion end (3) has a cylindrical hollow groove (31). The hollow groove (31) contains a coaxially arranged pad (4) and an elastic expansion body (5). The elastic expansion body (5) is closer to the male connector (2) than the pad (4). The axial length of the pad (4) is... and the axial length of the elastic expansion body (5) The sum of these is greater than the axial length of the hollow groove (31). The outer circumferential surface of the insertion end (3) is provided with several mounting grooves (32) arranged along the circumferential direction of the insertion end (3). Each mounting groove (32) is connected to the hollow groove (31). Each mounting groove (32) is provided with a limiting block (6). The position of the limiting block (6) is opposite to the position of the elastic expansion body (5). The radial dimension A of the limiting block (6) is greater than the radial dimension B of the limiting groove (12). The axial length of the mounting groove (32) is... The axial length of the limiting groove (12) is less than or equal to the axial length of the limiting groove (12). After the insertion end (3) is inserted into the receiving slot (11), the female head (1) and the male head (2) are set coaxially, and the position of the limiting block (6) is opposite to the position of the limiting slot (12).

2. The compressive expansion self-locking shield tunnel segment connection device according to claim 1, characterized in that, One end of the male connector (2) is provided with an insertion end (3), and the outer circumferential surface of the male connector (2) is provided with an external thread. The axial length of the insertion end (3) is... Equal to the axial length of the receiving slot (11) Alternatively, both ends of the male connector (2) are provided with insertion ends (3), the outer diameter of the male connector (2) is adapted to the inner diameter of the receiving groove (11), and the axial length of the male connector (2) is... and the axial length of the two insertion ends (3) The sum is equal to the axial length of the receiving groove (11). Twice as much.

3. The self-locking shield tunnel segment connection device according to claim 1, characterized in that, The outer circumferential surface of the female head (1) is provided with external threads.

4. The compressive self-locking shield tunnel segment connection device according to claim 1, characterized in that, The female head (1), male head (2), receiving slot (11), insertion end (3), hollow slot (31), pad (4) and elastic expansion body (5) are all cylindrical.

5. The self-locking shield tunnel segment connection device according to claim 1, characterized in that, Axial length of mounting groove (32) Equal to the axial length of the limiting groove (12) .

6. The self-locking shield tunnel segment connection device according to claim 1, characterized in that, Several mounting slots (32) are evenly arranged along the circumferential direction of the insertion end (3).

7. The self-locking shield tunnel segment connection device according to claim 1, characterized in that, The centerline of the mother head (1) is perpendicular to the splicing surface of the shield tunnel segment.

8. The self-locking shield tunnel segment connection device according to claim 1, characterized in that, The pad (4) is made of metal.

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