Shield segment socket structure

Abstract

The utility model relates to the technical field of tunnel lining, in particular to a shield segment socket structure which comprises a connecting rod and embedded parts assembled at the two ends of the connecting rod, the connecting rod comprises a spindle body with the middle protruding and rod bodies connected to the two ends of the spindle body and used for being matched with the embedded parts, and each embedded part comprises an outer pipe and an inner pipe. The inner pipe is composed of a plurality of elastic clamping pieces which are evenly distributed in the axial direction of the rod body, the elastic clamping pieces are all in a radial shape towards the near end to form a one-way expansion bayonet, the elastic clamping pieces are further provided with fasteners matched with the rod body, and the inner wall of the outer pipe is provided with a plurality of first annular flanges which are evenly distributed in the axial direction. A clamping groove capable of containing the expansion bayonet is formed between every two adjacent first annular flanges, and a fixing groove capable of containing the fastener is formed between every two adjacent second annular flanges. According to the pipe piece socket structure, the connecting rod is axially inserted into the embedded part through the socket structures at the two ends of the connecting rod, the connecting construction difficulty of adjacent pipe pieces is reduced, and the connecting stability is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel lining, in particular to a shield segment socket structure. Background Art

[0002] The shield segment is the main assembly component of the shield construction and the innermost barrier of the tunnel. It is responsible for resisting soil pressure, groundwater pressure and some special loads. The shield segment is the permanent lining structure of the shield tunnel. The quality of the shield segment is directly related to the overall quality and safety of the tunnel, and affects the waterproof performance and durability of the tunnel. After the shield is advanced, the segments are quickly assembled into a ring.

[0003] After searching, the patent with publication number CN110863839A discloses a new type of longitudinal connector for pipe segments, including two embedded parts and a connecting rod. The two embedded parts are respectively sleeved and threadedly connected to the two ends of the connecting rod, which makes the connection between the two pipe segments in the longitudinal direction more stable and reliable. However, it is found in the actual installation process that the screw connection construction at both ends is time-consuming and labor-intensive, and it is difficult to screw them into place, and the threads are easily damaged, resulting in a decrease in assembly accuracy, which in turn affects the connection reliability. Summary of the invention

[0004] In order to solve the problems of time-consuming and labor-intensive screw connection at both ends of existing connectors and poor connection reliability, the utility model provides a shield segment connection structure. Through the socket structure at both ends of the connecting rod, the connecting rod can be axially inserted into the embedded part, which reduces the difficulty of connecting the adjacent segments and ensures the stability of the connection.

[0005] The utility model provides a shield segment socket structure, comprising a connecting rod and embedded parts assembled at both ends of the connecting rod, the connecting rod comprising a spindle body with a protrusion in the middle and a rod body connected to both ends of the spindle body for cooperating with the embedded parts, the embedded parts comprising an outer tube and an inner tube, the inner tube is sleeved on the rod body of the connecting rod, and the two are buckled and fixed, the outer tube is sleeved on the inner tube, and the two are snap-connected, the inner tube and the outer tube both have a proximal end close to the spindle body and a distal end away from the spindle body, the outer tube is a tubular structure with an open proximal end and a closed distal end, and the inner tube is composed of uniformly distributed along the axial direction of the rod body. It is composed of several groups of elastic clips, which are all radially proximally formed to form a unidirectional expansion bayonet. The elastic clips are also provided with fasteners that cooperate with the rod body. The inner wall of the outer tube is provided with several annular flanges 1, which are evenly distributed along the axial direction, and a slot that can accommodate the expansion bayonet is formed between adjacent annular flanges 1. The outer wall of the rod is provided with several annular flanges 2, which are evenly distributed along the axial direction. Each annular flange 2 is circumferentially provided with a fastener groove for the elastic clip to pass through, and a fixed groove that can accommodate the fastener is formed between adjacent annular flanges 2. The socket structure at both ends of the connecting rod makes the assembly of the pipe segment simpler and the bonding strength better.

[0006] Furthermore, the elastic clamp includes a fixed portion and an expansion portion, the buckle is a clamp block circumferentially arranged on the inner wall of the fixed portion, the clamp block is adapted to the fixed groove, and the expansion portion is adapted to the clamp groove. The clamp block and the buckle groove are buckled to facilitate installation and removal of the elastic clamp.

[0007] Furthermore, the clamping block is arranged correspondingly to the buckle groove on the annular flange 2, and at least three groups are arranged correspondingly. The three groups of buckle grooves and the clamping block are arranged circumferentially, and the buckling stability is good.

[0008] Furthermore, a positioning step is provided on the end surface of the expansion part to abut against the annular flange 1, and a guiding inclined surface is also provided on the annular flange 1 for guiding the positioning step. By providing the guiding inclined surface, the expansion part can be smoothly abutted into the card slot.

[0009] Furthermore, the outer tube comprises a first half tube and a second half tube which are spliced ​​together, and end caps are arranged at the distal ends of the first half tube and the second half tube, and a plurality of stop threads are arranged on the outer wall of the outer tube, and the plurality of stop threads are evenly distributed in the axial direction. The spliced ​​tube structure makes it easy to demould the outer tube, and the stop threads can improve the pre-embedded stability.

[0010] Furthermore, the first half pipe and the second half pipe are clamped and fixed by the concave and convex blocks, and the joint surface of the first half pipe and the second half pipe is also provided with anti-rotation reinforcement ribs on the outside. The anti-rotation reinforcement ribs and anchor points are provided to further improve the bonding strength between the outer pipe and the pipe segment.

[0011] Furthermore, a positioning rod for limiting the position of the rod body is also provided in the end cover. The positioning rod and the annular flange 2 abut against each other to ensure assembly accuracy and connection stability.

[0012] Furthermore, a metal inner core is embedded in the connecting rod along its axial direction. The arrangement of the metal inner core improves the structural strength of the connecting rod and makes it resistant to bending and pulling.

[0013] Furthermore, the diameter of the spindle body decreases from the middle to the two ends, and a conical surface is formed at the two ends. The groove on the connecting surface of the tube segment matches the conical surface to ensure seamless connection of two adjacent tube segments.

[0014] Furthermore, a plurality of anti-rotation reinforcement ribs are arranged on the conical surface, the plurality of anti-rotation reinforcement ribs are evenly distributed circumferentially, and anti-rotation grooves are formed between adjacent anti-rotation reinforcement ribs. The anti-rotation reinforcement ribs and the anti-rotation grooves are arranged to further improve the connection stability.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides a shield segment socket structure, which completes the connection between two adjacent segments through the socket structures at both ends of the connecting rod, and the elastic clips are fixed to the rod body by snapping. Compared with the traditional assembly method, it is simpler and has better bonding strength. It has high pull-out resistance and high bending resistance, and each component is easy to produce and demould, thereby effectively improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is an external schematic diagram of the segment connection structure;

[0019] Figure 2 It is the internal schematic diagram of the segment connection structure;

[0020] Figure 3 It is the assembly drawing of the inner tube and the outer tube;

[0021] Figure 4 It is the assembly drawing of the elastic clip and the rod body;

[0022] Figure 5 It is the assembly drawing of the connecting rod and embedded parts;

[0023] In the figure, 1. connecting rod, 11. spindle, 12. rod body, 2. embedded parts, 21. outer tube, 22. annular flange 1, 221. guiding inclined surface, 23. slot, 24. annular flange 2, 241. buckle slot, 25. fixing slot, 26. end cover, 261. positioning rod, 27. anti-retraction thread, 28. anti-rotation reinforcement rib, 3. elastic clip, 31. fixing part, 311. buckle, 32. expansion part, 321. positioning step, 4. metal inner core. DETAILED DESCRIPTION

[0024] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0025] The traditional pipe segment connection structure includes a connecting rod 1 and embedded parts 2 assembled at both ends of the connecting rod 1. The connecting rod 1 includes a spindle 11 protruding in the middle and a rod body 12 connected to both ends of the spindle 11 for cooperating with the embedded parts 2. The connecting rod 1 is provided with an external thread on the outside, and the embedded parts 2 generally use internal thread sleeves adapted thereto. When in use, two embedded parts 2 are respectively embedded and positioned in the opposite surfaces of two adjacent pipe segments connected longitudinally, and then the external threads at both ends of the connecting rod 1 are rotated and assembled in the embedded parts 2. The actual construction process of this connection method is time-consuming and labor-intensive, and the threads are easily damaged, and the bonding strength is not high.

[0026] In order to facilitate the preparation and construction of the connection structure, a shield segment socket structure is designed, such as Figure 1 and 2 As shown, the embedded part 2 includes an outer tube 21 and an inner tube, the inner tube is sleeved on the rod body 12 of the connecting rod 1, and the two are buckled and fixed, the outer tube 21 is sleeved on the inner tube, and the two are buckled and connected, the inner tube and the outer tube 21 both have a proximal end close to the spindle 11 and a distal end away from the spindle 11, the outer tube 21 is a tubular structure with an open proximal end and a closed distal end, the inner tube is composed of a plurality of groups of elastic clips 3 uniformly distributed along the axial direction of the rod body 12, the elastic clips 3 are all radially proximal to form a unidirectional expansion bayonet, and the elastic clips 3 are also provided with The fastener 311 cooperates with the rod body 12, and the inner wall of the outer tube 21 is provided with a plurality of annular flanges 22, and the plurality of annular flanges 22 are evenly distributed along the axial direction, and a groove 23 for accommodating an expansion bayonet is formed between adjacent annular flanges 22. The outer wall of the rod body 12 is provided with a plurality of annular flanges 24, and the plurality of annular flanges 24 are evenly distributed along the axial direction. A buckle groove 241 for the fastener 311 of the elastic clamp 3 to pass through is circumferentially arranged on each annular flange 24, and a fixing groove 25 for accommodating the fastener 311 is formed between adjacent annular flanges 24.

[0027] The outer tube 21 is pre-buried in the opposite surfaces of two adjacent pipe segments, and the elastic clamp 3 is sequentially installed on the rod body 12 at both ends of the connecting rod 1. The fastener 311 on the inner wall of the elastic clamp 3 is aligned with the buckle groove 241 on the rod body 12 and inserted axially. When the fastener 311 is opposite to the fixed groove 25, the elastic clamp 3 is rotated so that the fastener 311 is inserted into the fixed groove 25, and the installation of the elastic clamp 3 is completed. During assembly, the connecting rod 1 equipped with the elastic clip 3 can be directly assembled in the outer tube 21 through axial force snap-fitting. The annular flange 22 on the inner wall of the outer tube 21 squeezes the one-way expansion snap-fitting of the elastic clip 3 inwardly in the axial and radial directions, so that the elastic clips 3 outside the rod body 12 shrink inwardly. When the distal end of the rod body 12 abuts against the end cover 26 at the end of the outer tube 21, the axial assembly is in place. After the assembly is completed, the one-way expansion snap-fitting of each elastic clip 3 restores its deformation and is placed in the card groove 23 formed between adjacent annular flanges 22 for positioning. The anti-retraction effect is good, which can effectively prevent the inner tube from falling out, making the assembly construction simpler, improving the bonding strength of the connection structure, and improving the pull-out resistance and earthquake resistance.

[0028] like Figure 3 and 4As shown, the elastic clamp 3 includes a fixed portion 31 and an expansion portion 32, and the fastener 311 is a clamp block circumferentially arranged on the inner wall of the fixed portion 31, the clamp block is adapted to the fixed groove 25, and the expansion portion 32 is adapted to the clamp groove 23. In order to ensure the stability of the buckle connection, the clamp block is arranged corresponding to the buckle groove 241 on the annular flange 24, and at least three groups are arranged correspondingly. During assembly, the three blocks on the inner wall of the elastic clip 3 are aligned with the three buckle grooves 241 on the rod body 12, and the elastic clip 3 is inserted into the rod body 12 until the blocks and the corresponding fixed grooves 25 are on the same circumference. Then the elastic clip 3 is rotated 60° (when three groups of blocks and buckle grooves 241 are correspondingly set), that is, when the three blocks are all placed in the fixed grooves 25, the installation of the elastic clip 3 is completed, and so on. The rotation buckle angle is related to the number and specifications of the blocks set. After completing the installation of the connecting rod 1, the assembled connecting rod 1 is directly inserted axially into the outer tube 21 embedded in the pipe segment to complete the assembly of adjacent pipe segments.

[0029] like Figure 3 As shown, a positioning step 321 is provided on the end face of the expansion part 32 to abut against the annular flange 1 22, and a guiding inclined surface 221 is also provided on the annular flange 1 22 for guiding the positioning step 321. The expansion bayonet is provided on the expansion part 32, and when the assembly is completed, the expansion bayonet restores its deformation, so that the positioning step 321 on the end face just abuts against the card slot 23 for fixing, and effectively preventing the elastic card 3 from falling out.

[0030] The outer tube 21 includes a first half tube and a second half tube, and the distal ends of the first half tube and the second half tube are provided with end caps. The outer wall of the outer tube 21 is provided with a plurality of stop threads 27, and the plurality of stop threads 27 are evenly distributed in the axial direction. The first half tube and the second half tube are clamped and fixed by concave and convex blocks, and positioning protrusions and positioning holes are relatively arranged on the joint surface. The joint surface of the first half tube and the second half tube is also provided with anti-rotation reinforcement ribs 28 on the outside, and the anti-rotation reinforcement ribs 28 are just protrudingly arranged on the connection surface, which can ensure the stability of the connection between the two half tubes, and at the same time ensure the strength of the reinforcement ribs 28, thereby improving the anti-rotation ability of the embedded part 2.

[0031] In order to ensure that the inner tube is axially assembled in place, a positioning rod 261 is also provided in the end cap for limiting the rod body 12. When the rod body 12 equipped with the elastic clamp 3 is inserted into the outer tube 21 until it abuts against the positioning rod 261 of the end cap 26, the connecting rod 1 is inserted in place.

[0032] like Figure 5 As shown, a metal inner core 4 is buried inside the connecting rod 1 along its axial direction to improve the structural strength of the connecting rod 1 and resist bending and pulling. The material of the metal inner core 4 can be iron or corrosion-resistant metal such as stainless steel.

[0033] The diameter of the spindle 11 decreases from the middle to both ends, and a conical surface is formed at both ends. A number of anti-rotation reinforcing ribs 28 are arranged on the conical surface, and the anti-rotation reinforcing ribs 28 are evenly distributed circumferentially, and anti-rotation grooves are formed between adjacent anti-rotation reinforcing ribs 28. A number of anti-rotation reinforcing ribs 28 are arranged on the conical surface, and the anti-rotation reinforcing ribs 28 are evenly distributed circumferentially, and anti-rotation grooves (not shown in the figure) are formed between adjacent anti-rotation reinforcing ribs 28 to improve the anti-rotation ability of the connection structure. The two conical surfaces of the spindle 11 are respectively arranged corresponding to the connecting surfaces of adjacent tube segments, and there are grooves on the connecting surfaces of the tube segments (the tube segments are not shown in the figure). The outer tubes 21 of the two embedded parts 2 are buried in the tube segments, and the ends of the embedded parts 2 are located at the bottom of the grooves. The shape of the grooves matches the conical surface of the spindle 11 to ensure that the two adjacent tube segments are seamlessly connected.

[0034] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the appended claims, but all will fall within the scope of protection of the present invention.

Claims

1. A shield segment socket structure, comprising a connecting rod (1) and embedded parts (2) mounted at both ends of the connecting rod (1), wherein the connecting rod (1) comprises a spindle body (11) with a protrusion in the middle and a rod body (12) connected to both ends of the spindle body (11) for cooperating with the embedded parts (2), Features: The embedded part (2) comprises an outer tube (21) and an inner tube, the inner tube is sleeved on the rod body (12) of the connecting rod (1), and the two are buckled and fixed, the outer tube (21) is sleeved on the inner tube, and the two are buckled and connected. The inner tube and the outer tube (21) both have a proximal end close to the spindle (11) and a distal end away from the spindle (11); the outer tube (21) is a tubular structure with an open proximal end and a closed distal end. The inner tube is composed of a plurality of groups of elastic clips (3) uniformly distributed along the axial direction of the rod body (12), the elastic clips (3) are all radially arranged toward the proximal end to form a unidirectional expansion bayonet, and the elastic clips (3) are also provided with fasteners (311) that cooperate with the rod body (12). The inner wall of the outer tube (21) is provided with a plurality of annular flanges (22), the plurality of annular flanges (22) being evenly distributed along the axial direction, and a slot (23) capable of accommodating an expansion bayonet is formed between adjacent annular flanges (22). The outer wall of the rod body (12) is provided with a plurality of annular flanges (24), the plurality of annular flanges (24) being evenly distributed along the axial direction, and each annular flange (24) is circumferentially provided with a buckle groove (241) for allowing a buckle (311) of the elastic clamp (3) to pass through, and a fixing groove (25) for accommodating the buckle (311) is formed between adjacent annular flanges (24).

2. A shield segment socket structure according to claim 1, characterized in that: The elastic clamp (3) comprises a fixing portion (31) and an expansion portion (32), the fastener (311) is a clamping block circumferentially arranged on the inner wall of the fixing portion (31), the clamping block is matched with the fixing groove (25), and the expansion portion (32) is matched with the clamping groove (23).

3. A shield segment socket structure according to claim 2, characterized in that: The clamping blocks are arranged correspondingly to the buckle grooves (241) on the second annular flange (24), and at least three groups are arranged correspondingly.

4. A shield segment socket structure according to claim 2, characterized in that: A positioning step (321) that abuts against the annular flange 1 (22) is provided on the end surface of the expansion portion (32), and a guiding inclined surface (221) for guiding the positioning step (321) is also provided on the annular flange 1 (22).

5. The shield segment socket structure according to claim 1, characterized in that: The outer tube (21) comprises a first half tube and a second half tube which are assembled together, end caps being provided at the distal ends of the first half tube and the second half tube, and a plurality of stop threads (27) being provided on the outer wall of the outer tube (21), the plurality of stop threads (27) being evenly distributed in the axial direction.

6. A shield segment socket structure according to claim 5, characterized in that: The first half tube and the second half tube are clamped and fixed by means of the concave and convex blocks, and an anti-rotation reinforcing rib (28) is also provided outside the joint surface of the first half tube and the second half tube.

7. The shield segment socket structure according to claim 5, characterized in that: A positioning rod (261) for limiting the position of the rod body (12) is also provided in the end cover.

8. The shield segment socket structure according to claim 1, characterized in that: A metal inner core (4) is buried inside the connecting rod (1) along its axial direction.

9. The shield segment socket structure according to claim 1, characterized in that: The diameter of the spindle (11) decreases from the middle to both ends, and forms conical surfaces at both ends.

10. A shield segment socket structure according to claim 9, characterized in that: A plurality of anti-rotation reinforcement ribs (28) are provided on the conical surface, the plurality of anti-rotation reinforcement ribs (28) are evenly distributed in the circumferential direction, and anti-rotation grooves are formed between adjacent anti-rotation reinforcement ribs (28).

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