Shield segment assembling structure

Abstract

The utility model relates to the technical field of tunnel lining, in particular to a shield segment assembling 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, and the outer pipe is arranged on the inner pipe in a sleeved mode. Each of the inner tube and the outer tube is provided with a near end close to the spindle body and a far end far away from the spindle body, the outer tube is of a tubular structure with an open near end and a closed far end, the inner tube is composed of a plurality of groups of elastic clamping pieces which are uniformly 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, and a plurality of annular flanges are arranged on the inner wall of the outer tube. Clamping grooves capable of containing the expansion bayonets are formed between the adjacent annular flanges, the rod body is provided with external threads, and the inner pipe is provided with internal threads matched with the external threads. 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 assembly 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 assembly 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 assembly structure, comprising a connecting rod and embedded parts assembled at two ends of the connecting rod, the connecting rod comprising a spindle body protruding in the middle and a rod body connected to the two 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 threadedly connected, 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, the inner tube is composed of a plurality of groups of elastic clips uniformly distributed along the axial direction of the rod body, the elastic clips are all radially toward the proximal end, forming a unidirectional expansion bayonet, the inner wall of the outer tube is provided with a plurality of annular flanges, the plurality of annular flanges are uniformly distributed along the axial direction, a slot for accommodating the expansion bayonet is formed between adjacent annular flanges, the rod body is provided with an external thread, and the inner tube is provided with an internal thread matched with the external thread. The socket structure at both ends of the connecting rod makes the assembly of the pipe segments easier and the bonding strength better.

[0006] Furthermore, the elastic clamp includes a fixing part and an expansion part, wherein the fixing part is provided with an internal thread matching the external thread of the rod body, and the expansion part matches the clamping groove. The matching of the fixing part and the external thread of the rod body facilitates the installation and removal of the elastic clamp.

[0007] Furthermore, a positioning step is provided on the end surface of the expansion part to abut against the annular flange, and a guiding inclined surface is also provided on the annular flange for guiding the positioning step. The setting of the guiding inclined surface facilitates the socket-insertion operation of the outer tube and the inner tube.

[0008] Furthermore, a transition sleeve is provided between adjacent elastic clamps, the transition sleeve is threadedly connected to the rod body and is placed between the fixing parts of adjacent elastic clamps. The position of the elastic clamp can be limited by the provision of the transition sleeve, and the strength of the inner tube is also improved.

[0009] Furthermore, a locking cover for limiting the position of the inner tube is also provided at the end of the rod body. By screwing the locking cover at the end of the rod body, a plurality of elastic clamps are restricted on the rod body.

[0010] Furthermore, the outer tube 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, and a positioning rod for resisting the locking cover is provided inside the end cap. The relative positions of the inner and outer tubes are limited by the cooperation of the positioning rod and the locking cover.

[0011] Furthermore, the first half pipe and the second half pipe are clamped and fixed by the concave and convex blocks, the joint surface of the first half pipe and the second half pipe is provided with anti-rotation reinforcement ribs on the outside, and the outer wall of the outer pipe is also provided with a plurality of anti-retraction threads, and the plurality of anti-retraction threads are evenly distributed in the axial direction. The spliced ​​pipe structure makes it easy to demould the outer pipe, and the provision of the anti-rotation reinforcement ribs and anchor points further improves the bonding strength between the outer pipe and the pipe segment.

[0012] Furthermore, a metal inner core is embedded in the rod body along its axial direction. The metal inner core is provided to improve the structural strength of the connecting rod and to resist 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 assembly structure, which completes the connection between two adjacent segments through the socket structures at both ends of the connecting rod, and the elastic clamp is fixed to the rod body by screw connection. Compared with the traditional screw connection assembly method, the socket method 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 assembly structure;

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

[0020] Figure 3 yes Figure 2 Schematic diagram after the inner tube is hidden;

[0021] Figure 4 It is a structural diagram of embedded parts;

[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, 221. guide slope, 23. slot, 24. transition sleeve, 25. locking cover, 26. end cover, 261. positioning rod, 27. anti-retraction thread, 28. anti-rotation reinforcement rib, 3. elastic clip, 31. fixing part, 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] like Figure 1 As shown, the conventional segment assembly 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 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 assembled structure, a shield segment assembly structure is designed, such as Figure 2As 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 threadedly connected, the outer tube 21 is sleeved on the inner tube, and the two are snap-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, 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 that can accommodate the expansion bayonet is formed between adjacent annular flanges 22, the rod body 12 is provided with an external thread, and the inner tube is provided with an internal thread that matches the external thread.

[0027] The outer tube 21 is pre-buried in the opposite surfaces of two adjacent pipe segments, and the elastic clips 3 are screwed and installed on the rod body 12 at both ends of the connecting rod 1 in sequence. In order to ensure that the spacing between adjacent elastic clips 3 is fixed, a transition sleeve 24 is screwed between adjacent elastic clips 3 to abut the adjacent elastic clips 3 to ensure their relative positions. After the elastic clips 3 are installed, the locking cover 25 at the end of the rod body 12 is used to limit and fix the elastic clips 3. During assembly, the connecting rod 1 equipped with the elastic clip 3 can be directly assembled in the outer tube 21 by 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 expansion parts 32 of each elastic clip 3 outside the rod body 12 shrink inwardly. When the distal end of the rod body 12 abuts against the positioning rod 261 of 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 2 and 4 As shown, the elastic clamp 3 includes a fixing portion 31 and an expansion portion 32, wherein the fixing portion 31 is provided with an internal thread matched with the external thread of the rod body 12, and the expansion portion 32 is matched with the clamping groove 23. Before assembly, a plurality of elastic clamps 3 and transition sleeves 24 are screwed 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 axially inserted into the outer tube 21 pre-embedded in the segment to complete the assembly of adjacent segments.

[0029] 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, and 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, and is fixed, effectively preventing the elastic card 3 from falling out.

[0030] like Figure 5 As shown, in order to ensure that the spacing between adjacent elastic clips 3 is fixed, a transition sleeve 24 is provided between adjacent elastic clips 3, and the transition sleeve 24 is threadedly connected to the rod body 12 and placed between the fixing portions 31 of adjacent elastic clips 3, so that the fixing portions 31 of the elastic clips 3 and the transition sleeve 24 are pressed against each other to achieve the limited fixation of several elastic clips 3. In order to further improve the installation stability of the elastic clips 3, a locking cover 25 is also threadedly connected to the end of the rod body 12, thereby effectively preventing the elastic clips 3 from falling out.

[0031] like Figure 4 As shown, specifically, the outer tube 21 includes a first half tube and a second half tube that are assembled together, 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 grooves are relatively provided on the assembled surface. Anti-rotation reinforcement ribs 28 are also provided on the outside of the assembled surface of the first half tube and the second half tube, 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 on one hand, and also ensure the strength of the reinforcement ribs 28 at the same time, thereby improving the anti-rotation ability of the embedded part 2.

[0032] In order to ensure that the inner tube is axially assembled in place, a positioning rod 261 is provided in the end cover 26 for abutting against the locking cover 25. When the rod body 12 equipped with the elastic clamp 3 is axially inserted into the outer tube 21 until it abuts against the positioning rod 261 of the end cover 26, it is assembled in place.

[0033] like Figure 5 As shown, in order to ensure the strength of the rod body 12, 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.

[0034] 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 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.

[0035] 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 assembly structure, comprising a connecting rod (1) and embedded parts (2) assembled 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 threadedly connected, the outer tube (21) is sleeved on the inner tube, and the two are snap-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), and the elastic clips (3) are all radially arranged toward the proximal end to form a unidirectional expansion slot. The inner wall of the outer tube (21) is provided with a plurality of annular flanges (22), the plurality of annular flanges (22) are evenly distributed along the axial direction, and a slot (23) capable of accommodating an expansion bayonet is formed between adjacent annular flanges (22). The rod body (12) is provided with an external thread, and the inner tube is provided with an internal thread matching the external thread.

2. A shield segment assembly structure according to claim 1, characterized in that: The elastic clamp (3) comprises a fixing portion (31) and an expansion portion (32); the fixing portion (31) is provided with an internal thread matched with the external thread of the rod body (12); and the expansion portion (32) is matched with the clamping groove (23).

3. A shield segment assembly structure according to claim 2, characterized in that: A positioning step (321) that abuts against the annular flange (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 (22).

4. The shield segment assembly structure according to claim 2, characterized in that: A transition sleeve (24) is provided between adjacent elastic clamps (3); the transition sleeve (24) is threadedly connected to the rod body (12) and is disposed between the fixing portions (31) of adjacent elastic clamps (3).

5. The shield segment assembly structure according to claim 4, characterized in that: The end of the rod body (12) is also provided with a locking cover (25) for limiting the position of the inner tube.

6. The shield segment assembly structure according to claim 5, characterized in that: The outer tube (21) comprises a first half tube and a second half tube which are assembled together. The distal ends of the first half tube and the second half tube are provided with end covers (26). A positioning rod (261) for resisting against a locking cover (25) is provided inside the end cover (26).

7. The shield segment assembly structure according to claim 6, characterized in that: The first half tube and the second half tube are clamped and fixed by means of concave and convex blocks, an anti-rotation reinforcing rib (28) is provided on the outside of the joint surface of the first half tube and the second half tube, and a plurality of anti-retraction threads (27) are also provided on the outer wall of the outer tube (21), and the plurality of anti-retraction threads (27) are evenly distributed in the axial direction.

8. The shield segment assembly structure according to claim 1, characterized in that: A metal inner core (4) is buried inside the rod body (12) along its axial direction.

9. The shield segment assembly structure according to claim 1, characterized in that: The diameter of the spindle (11) decreases gradually from the middle to both ends, and cone surfaces are formed at both ends.

10. The shield segment assembly structure according to claim 9, characterized in that: A plurality of anti-rotation reinforcement ribs (28) are arranged 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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