Shield segment connecting structure

Abstract

The utility model relates to the technical field of tunnel lining, in particular to a shield segment connecting structure which comprises a connecting rod and embedded parts assembled at the two ends of the connecting rod, each embedded part comprises an outer pipe and an inner pipe, the inner pipe is arranged on a rod body of the connecting rod in a sleeved mode, the outer pipe is arranged on the inner pipe in a sleeved mode, and the outer pipe is of a tubular structure with the open near end and the closed far end. The inner pipe is composed of a plurality of elastic clamping pieces 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, a plurality of first annular flanges are arranged on the inner wall of the outer pipe, clamping grooves capable of containing the expansion bayonets are formed between the adjacent first annular flanges, and a plurality of second annular flanges are arranged on the outer wall of the rod body. A fixing groove capable of containing the elastic clamping piece is formed between every two adjacent second annular flanges. According to the shield segment connecting structure, the ends of the connecting rods are directly clamped into the embedded parts through the socket structures at the two ends of the connecting rods, the connecting construction difficulty of adjacent segments 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 connection 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. Utility Model Content

[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 connection structure, comprising a connecting rod and embedded parts assembled at both ends of the connecting rod, the connecting rod comprising a spindle body protruding 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 connected by a buckle, the outer tube is sleeved on the inner tube, and the two are connected by a buckle, 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 proximal end of the outer tube is open The distal end of the tube is closed. The inner tube is composed of several groups of elastic clips evenly distributed along the axial direction of the rod body. The elastic clips are all radially toward the proximal end to form a unidirectional expansion bayonet. The inner wall of the outer tube is provided with several annular flanges 1, which are evenly distributed along the axial direction. 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. A fixed groove that can accommodate the elastic clip 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 part and an expansion part, the fixed part is matched with the fixed groove, the expansion part is matched with the clamping groove, the fixed part is provided with an opening connected with the expansion clamping opening, and the elastic clamp is sleeved on the rod body through the fixed part. The setting of the elastic opening makes it convenient to sleeve the fixed part on the rod body.

[0007] Furthermore, the inner wall of the fixing part is provided with a positioning step 2 for abutting against the annular flange 2, and the annular flange 2 is also provided with a guiding slope 2 for guiding the positioning step 2. By providing the guiding slope 2, the fixing part can be smoothly abutted into the fixing groove.

[0008] Furthermore, a positioning step 1 is provided on the end surface of the expansion part to abut against the annular flange 1, and a guiding inclined surface 1 is also provided on the annular flange 1 for guiding the positioning step 1. By setting the guiding inclined surface 1, the expansion part can be smoothly pushed 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, the annular flange 2 extends to the far end of the rod body, both ends of the rod body of the connecting rod are annular flange 2, and the inner side of the end cap is also provided with a positioning rod against the annular flange 2. 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 connection structure, which completes the connection between two adjacent segments through the socket structures at both ends of the connecting rod, and the elastic clip is fixed to the rod body through the open fixing part. Compared with the traditional assembly method, it is simpler and has better bonding strength, high pull-out resistance and high bending resistance, and each component is easy to produce and demould, thereby effectively improving the 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 yes Figure 2 Schematic diagram after the inner tube is hidden;

[0021] Figure 4 It is a structural schematic diagram of the connecting rod;

[0022] Figure 5 It is a structural diagram of embedded parts;

[0023] Figure 6 It is a schematic diagram of the structure of the elastic card;

[0024] Figure 7 It is the assembly drawing of the connecting rod and embedded parts;

[0025] In the figure, 1. connecting rod, 11. spindle, 12. rod body, 2. embedded parts, 21. outer tube, 22. annular flange 1, 221. guiding slope 1, 23. slot, 24. annular flange 2, 241. guiding slope 2, 25. fixing groove, 26. end cover, 261. positioning rod, 27. anti-retraction thread, 28. anti-rotation reinforcement rib, 3. elastic clip, 31. fixing part, 311. positioning step 2, 32. expansion part, 321. positioning step 1, 33. opening, 4. metal inner core. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] In order to facilitate the preparation and construction of the connection structure, a shield segment connection 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 connected by a snap-fit, the outer tube 21 is sleeved on the inner tube, and the two are connected by a snap-fit, 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 toward the proximal end, forming a unidirectional expansion bayonet, the inner wall of the outer tube 21 is provided with a plurality of annular flanges 22, the plurality of annular flanges 22 are uniformly distributed along the axial direction, and a slot 23 for accommodating the 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 are uniformly distributed along the axial direction, and a fixing groove 25 for accommodating the elastic clip 3 is formed between adjacent annular flanges 24.

[0029] The outer tube 21 is pre-buried in the opposite surfaces of two adjacent pipe segments, and the elastic clips 3 are installed on the rod bodies 12 at both ends of the connecting rod 1 in sequence. During assembly, the connecting rod 1 equipped with the elastic clips 3 can be directly assembled in the outer tube 21 by axial force snap-fitting, and the annular flange 22 on the inner wall of the outer tube 21 squeezes the one-way expansion snap-in 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, and the axial assembly is completed after the distal end of the rod body 12 abuts against the end cover 26 at the end of the outer tube 21. After the assembly is completed, the one-way expansion snap-in of each elastic clip 3 restores its deformation and is placed in the card groove 23 formed between the adjacent annular flanges 22 for positioning, which has a good anti-retraction effect and 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 seismic resistance.

[0030] like Figure 6As shown, the elastic clamp 3 includes a fixing portion 31 and an expansion portion 32, the fixing portion 31 is matched with the fixing groove 25, the expansion portion 32 is matched with the clamping groove 23, the fixing portion 31 is provided with an opening 33 connected with the expansion clamping port, and the elastic clamp 3 is sleeved on the rod body 12 through the fixing portion 31. The opening connected with the expansion clamping port can facilitate the elastic clamp 3 to be sleeved into the fixing groove 25 formed between the adjacent annular flanges 24 on the rod body 12. Before assembly, a plurality of elastic clamps 3 are sleeved onto the rod body 12 in sequence to complete the installation of the connecting rod 1, and then the assembled connecting rod 1 is directly inserted into the outer tube 21 pre-embedded in the pipe segment to complete the assembly of the adjacent pipe segments.

[0031] like Figure 3 As shown, the inner wall of the fixing portion 31 is provided with a second positioning step 311 that abuts against the second annular flange 24, and the second annular flange 24 is also provided with a second guiding slope 241 for guiding the second positioning step 311. The second positioning step 311 has a certain thickness, which can improve the connection strength between the elastic clamp 3 and the rod body 12. When the elastic clamp 3 is inserted into the fixing groove 25 by using the opening on the expansion portion 32, the second guiding slope 241 can ensure that it is inserted in place, avoiding the situation of being stuck outside the flange.

[0032] The end surface of the expansion part 32 is provided with a positioning step 321 that abuts against the annular flange 22, and the annular flange 22 is also provided with a guiding inclined surface 221 for guiding the positioning step 321. The expansion bayonet is provided on the expansion part 32. When the assembly is completed, the expansion bayonet restores its deformation, so that the positioning step 321 on the end surface just abuts against the card slot 23 for fixing, effectively preventing the elastic card 3 from falling out.

[0033] like Figure 5 As shown, the outer tube 21 includes a first half tube and a second half tube that are assembled, and an end cap 26 is provided at the distal end of the first half tube and the second half tube. A plurality of stop threads 27 are provided on the outer wall of the outer tube 21, 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 provided on the assembled surface. Anti-rotation reinforcement ribs 28 are also provided on the outer surface of the assembled surface of the first half tube and the second half tube. 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.

[0034] In order to ensure that the inner tube is assembled in place axially, the annular flange 24 extends to the distal end of the rod body 12. Both ends of the rod body 12 of the connecting rod 1 are annular flanges 24, and the inner side of the end cover 26 is also provided with a positioning rod 261 that abuts against the annular flange 24. When the rod body 12 equipped with the elastic clamp 3 is placed in the outer tube 21 until it abuts against the positioning rod 261 of the end cover 26, it is assembled in place.

[0035] like Figure 7 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.

[0036] like Figure 4 As shown, 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. 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 embedded 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.

[0037] 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 connection 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) and used 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 connected by a snap-fit, and the outer tube (21) is sleeved on the inner tube, and the two are connected by a snap-fit. 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), and the elastic clips (3) are all radially extending toward the proximal end to form a unidirectional expansion clip. 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) are evenly distributed along the axial direction, and fixing grooves (25) capable of accommodating the elastic clamp (3) are formed between adjacent annular flanges (24).

2. A shield segment connection structure according to claim 1, characterized in that: The elastic clamp (3) comprises a fixing portion (31) and an expansion portion (32), wherein the fixing portion (31) is matched with the fixing groove (25), and the expansion portion (32) is matched with the clamping groove (23). The fixing portion (31) is provided with an opening (33) communicating with the expansion bayonet, and the elastic clamp (3) is sleeved on the rod body (12) through the fixing portion (31).

3. A shield segment connection structure according to claim 2, characterized in that: The inner wall of the fixing portion (31) is provided with a second positioning step (311) that abuts against the second annular flange (24), and the second annular flange (24) is also provided with a second guiding inclined surface (241) for guiding the second positioning step (311).

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

5. The shield segment connection 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, and end covers (26) are provided at the distal ends of the first half tube and the second half tube. A plurality of stop threads (27) are provided on the outer wall of the outer tube (21), and the plurality of stop threads (27) are evenly distributed in the axial direction.

6. A shield segment connection 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. A shield segment connection structure according to claim 5, characterized in that: The annular flange 2 (24) extends to the distal end of the rod body (12), both ends of the rod body (12) of the connecting rod (1) are annular flange 2 (24), and a positioning rod (261) is also provided on the inner side of the end cover (26) to abut against the annular flange 2 (24).

8. The shield segment connection 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 connection 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 connection 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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