Tunnel segment and lining adjustable connecting structure

Abstract

The invention discloses a tunnel segment and lining adjustable connecting structure, and relates to the technical field of tunnel segment construction, the tunnel segment and lining adjustable connecting structure comprises a segment and a prefabricated lining arranged on the inner side of the segment, and a plurality of threaded sleeves are pre-buried in the segment; a supporting sleeve is pre-embedded in the position, corresponding to the threaded sleeve, of the prefabricated lining, a supporting plate is rotatably installed in the supporting sleeve, an eccentric hole is formed in the supporting plate, a screw rod is installed on the threaded sleeve, the other end of the screw rod penetrates through the eccentric hole, and the end of the screw rod is fixedly installed on the outer side of the supporting plate through a connecting piece; a plugging plate is arranged at the end part of the supporting sleeve; two or three threaded sleeves are arranged at the position, corresponding to one supporting sleeve, of the segment, and the interval between every two adjacent threaded sleeves is larger than the diameter of the corresponding supporting sleeve and smaller than two times of the diameter of the corresponding supporting sleeve 4. The structure can be used for reliably connecting the duct piece and the lining, and is high in error adaptability, convenient to install and construct and simple and compact in structure.

Description

Technical Field

[0001] The present invention relates to the technical field of segment construction in tunnels, and particularly relates to an adjustable connection structure between tunnel segments and inner linings. Background Art

[0002] Tunnel segment construction is a key link in tunnel construction. Especially in tunnels constructed by the shield method, in order to improve the safety, durability, fire resistance, impact resistance and toughness of the tunnel segment structure, an inner lining structure needs to be set inside the tunnel segment. The existing connection methods between tunnel segments and precast inner linings mainly include bolt connection, steel bar connection, tenon and groove connection and grouting connection. Bolt connection usually involves pre-reserving bolt holes on the tunnel segment and the precast inner lining respectively, and fastening the two together by passing bolts through these holes. This method is relatively simple, but there are construction errors in the two bolt holes, and actual installation is difficult. To solve this problem, indirect bolt connection is adopted during construction. First, connection sleeves or nuts are embedded in the segment, and corresponding bolt holes or connection components are set on the precast inner lining. During installation, the bolts are screwed into the sleeves or nuts to achieve connection, which can adapt to a certain construction error. However, this method increases the complexity of the structure, and there are protrusions of the connection structure on the surface of the inner lining, which is not conducive to subsequent construction. Steel bar connection is to drill holes in the segment first, clean them, inject structural adhesive, and then implant steel bars into the holes. After the structural adhesive cures, the steel bars form a reliable connection with the segment. Then, the precast inner lining is fixed on the segment through connection with these implanted steel bars (such as welding, tying, etc.). This method has low construction efficiency, complex coordination with other processes, and poor overall fatigue resistance after connection. Tenon and groove connection is to set convex tenons on the edge of the tunnel segment and corresponding grooves on the precast inner lining. During installation, the convex tenons are inserted into the grooves to form an interlocking connection. However, it has high requirements for the manufacturing precision of the structure, is difficult to adjust the position during installation, and has poor structural flexural stiffness. Summary of the Invention

[0003] The purpose of the present invention is to provide an adjustable connection structure between tunnel segments and inner linings, which can reliably connect the segments and the inner linings, has strong error adaptability, is convenient for installation and construction, has a simple and compact structure, and ensures the flexural stiffness and structural strength of the overall structure after connection.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A tunnel segment and lining adjustable connection structure, comprising a segment and a prefabricated liner arranged on the inner side of the segment, wherein a plurality of threaded sleeves are pre-embedded in the segment; a support sleeve is pre-embedded on the prefabricated liner at a position corresponding to the threaded sleeve, a support plate is rotatably mounted in the support sleeve, an eccentric hole is arranged on the support plate, a screw is mounted on the threaded sleeve, the other end of the screw passes through the eccentric hole, and the end of the screw is fixedly mounted on the outer side of the support plate through a connecting piece; a blocking plate is arranged at the end of the support sleeve; two or three threaded sleeves are arranged on the segment at a position corresponding to a support sleeve, and the interval between two adjacent threaded sleeves is greater than the diameter of the support sleeve and less than twice the diameter of the support sleeve 4.

[0005] Preferably, a grouting joint is provided between the pipe segment and the prefabricated liner.

[0006] Preferably, an inner staggered platform is provided at the end of the support sleeve, and the support plate is provided on the inner staggered platform.

[0007] Preferably, the eccentric hole is a rectangular hole or a waist-shaped hole.

[0008] Preferably, a connecting boss is provided on the support plate, and the eccentric hole is provided on the connecting boss.

[0009] Preferably, the connecting member is a steel plate or a nut, and a through hole matching the screw rod is provided on the steel plate.

[0010] Preferably, structural protrusions are provided on the outer sides of the threaded sleeve and the supporting sleeve.

[0011] Preferably, the sealing plate is sealingly connected to the end of the supporting sleeve.

[0012] In the present invention, the pipe segment and the prefabricated liner are fixedly connected by screws, and the whole after connection has strong structural bending rigidity and structural strength. Grouting connection is performed at the grouting seam between the pipe segment and the prefabricated liner, so that the pipe segment and the prefabricated liner are tightly bonded together to jointly bear the pressure of the soil around the tunnel and other loads, thereby improving the force transmission effect, and also playing a role of waterproof sealing, which can prevent groundwater and the like from penetrating into the tunnel.

[0013] The support sleeve can adapt to the installation error and manufacturing error of the center position of the threaded sleeve. By rotating the support plate so that the eccentric hole corresponds to the threaded sleeve, the end of the screw can be fixed, so that the pipe segment and the prefabricated liner are firmly connected. The plugging plate is sealed and connected to the end of the support sleeve to avoid leakage during grouting. The connecting boss can improve the structural strength of the support plate and further improve the bending resistance. The connecting boss protrudes toward one side of the pipe segment, so that the exposed length of the screw can be locked by installing a double nut, which is convenient to connect and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is an enlarged schematic diagram of the local structure of the present invention in the direction A; Figure 3 It is a top view schematic diagram of the support plate structure of the present invention; Figure 4 It is a top view schematic diagram of the connecting piece structure of the present invention; Figure 5 A cross-sectional schematic diagram of another embodiment of the support plate of the present invention in a screw-mounted state; In the figure: 1. pipe segment; 2. prefabricated lining; 3. threaded sleeve; 4. support sleeve; 5. grouting joint; 6. support plate; 7. eccentric hole; 8. internal offset; 9. connecting boss; 10. structural protrusion; 11. screw; 12. connecting piece; 13. sealing plate. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings: like Figures 1 to 5 The adjustable connection structure between a tunnel segment and an inner lining shown in the figure comprises a segment 1 and a prefabricated inner lining 2 arranged inside the segment 1, wherein the segment 1 and the prefabricated inner lining 2 are concrete structures. A plurality of threaded sleeves 3 are pre-embedded in a preset position of the segment 1, and the ends of the threaded sleeves 3 are flush with or slightly lower than the inner wall of the segment 1. In a preferred embodiment, a structural protrusion 10 is arranged on the outer side of the threaded sleeve 3, and the arrangement of the structural protrusion 10 can improve the connection strength between the threaded sleeve 3 and the segment 1 and ensure the stability of the connection.

[0016] A support sleeve 4 is pre-embedded on the prefabricated liner 2 at a position corresponding to the threaded sleeve 3. The diameter of the support sleeve 4 is not less than twice the diameter of the threaded sleeve 3, which can accommodate a certain amount of manufacturing error and facilitate position adjustment between the segment 1 and the prefabricated liner 2. A structural protrusion 10 is also provided on the outside of the support sleeve 4. The provision of the structural protrusion 10 can improve the connection strength between the support sleeve 4 and the prefabricated liner 2 and ensure the stability of the connection.

[0017] A support plate 6 is rotatably installed in the support sleeve 4. An eccentric hole 7 is provided on the support plate 6. During installation, the support plate 6 is rotated so that the eccentric hole 7 corresponds to the threaded sleeve 3. In this embodiment, the eccentric hole 7 is a rectangular hole or a waist-shaped hole. An internal stepped portion 8 is provided at the end of the support sleeve 4, and the support plate 6 is arranged on the internal stepped portion 8. In a preferred embodiment, a connecting boss 9 is integrally provided on the support plate 6, and the eccentric hole 7 is provided on the connecting boss 9. A connecting groove is provided in the support sleeve 4, and the support plate 6 is rotatably arranged in the connecting groove. Of course, the connecting groove may not be provided. The support plate 6 is rotated to align the eccentric hole 7 with the center of the threaded sleeve 3, and then the support plate 6 is welded in the support sleeve 4.

[0018] In a more preferred embodiment, at the corresponding position of a support sleeve 4, two or three threaded sleeves 3 are embedded in the segment 1. The interval between two adjacent threaded sleeves 3 is greater than the diameter of a support sleeve 4 and less than twice the diameter of the support sleeve 4, further improving the adaptability to installation errors and manufacturing errors.

[0019] A screw 11 is installed on the threaded sleeve 3 by threads. The other end of the screw 11 passes through the eccentric hole 7 and is located on the other side of the support plate 6. After the connection is completed, the end of the screw 11 is fixedly installed on the outer side of the support plate 6 through a connecting member 12. The connecting member 12 is a steel plate. A through hole adapted to the screw 11 is provided at the center of the steel plate. The through hole of the steel plate is sleeved on the screw 11. First, the steel plate and the screw 11 are welded and fixed, and then the steel plate is fixed on the surface of the support plate 6 to achieve a fixed connection. The setting of the connecting boss 9 provides a fixed installation space for the screw 11, facilitating the use of nuts for fixation and reducing welding operations.

[0020] A sealing plate 13 is provided at the end of the support sleeve 4. The sealing plate 13 and the end of the support sleeve 4 are hermetically connected by full welding. The connection structure between the segment 1 and the precast lining 2 is sealed and blocked by the sealing plate 13, facilitating subsequent grouting operations.

[0021] After the segment 1 and the precast lining 2 are connected, a grouting seam 5 is provided between them. After assembly, grouting is carried out in the grouting seam 5 so that the segment 1 and the precast lining 2 are connected as a whole.

[0022] The above embodiments are only several descriptions of the concept and implementation of the present invention, and are not intended to limit it. Under the concept of the present invention, technical solutions without substantial transformation are still within the protection scope.

Claims

1. An adjustable connection structure between a tunnel segment and an inner lining, comprising a segment and a prefabricated inner lining arranged inside the segment, characterized in that: A plurality of threaded sleeves are embedded in the segment; a support sleeve is embedded in the prefabricated liner at a position corresponding to the threaded sleeve, a support plate is rotatably installed in the support sleeve, an eccentric hole is provided on the support plate, a screw is installed on the threaded sleeve, the other end of the screw passes through the eccentric hole, and the end of the screw is fixedly installed on the outside of the support plate through a connecting piece; a blocking plate is provided at the end of the support sleeve; two or three threaded sleeves are provided on the segment at a position corresponding to a support sleeve, and the interval between two adjacent threaded sleeves is greater than the diameter of the support sleeve and less than twice the diameter of the support sleeve 4.

2. The adjustable connection structure between tunnel segments and lining according to claim 1 is characterized in that: A grouting joint is provided between the pipe segment and the prefabricated liner.

3. The adjustable connection structure between tunnel segments and lining according to claim 1 or 2, characterized in that: An inner staggered platform is arranged at the end of the supporting sleeve, and the supporting plate is arranged on the inner staggered platform.

4. The adjustable connection structure between tunnel segments and lining according to claim 1 is characterized in that: The eccentric hole is a rectangular hole or a waist-shaped hole.

5. The adjustable connection structure between tunnel segments and lining according to claim 1 is characterized in that: A connecting boss is arranged on the supporting plate, and the eccentric hole is arranged on the connecting boss.

6. The adjustable connection structure between tunnel segments and lining according to claim 5 is characterized in that: The connecting piece is a steel plate or a nut, and a through hole matching the screw rod is arranged on the steel plate.

7. The adjustable connection structure between tunnel segments and lining according to claim 1 or 5, characterized in that: Structural protrusions are arranged on the outer sides of the threaded sleeve and the supporting sleeve.

8. The adjustable connection structure between tunnel segments and lining according to claim 5 is characterized in that: The blocking plate is sealed and connected to the end of the supporting sleeve.

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