Road tunnel segment connecting bolt

Abstract

The utility model relates to a highway tunnel segment connecting bolt which comprises a screw and a nut, the front half portion of the screw is a threaded section, threads are arranged on the outer wall of the screw, the rear half portion of the screw is an anchoring section, no threads are arranged on the outer wall of the screw, a hexagonal end is arranged at the rear end of the screw, one end of the nut is open, and the other end of the nut is closed. At least two annular anti-pulling toothed plates are arranged on the outer wall of the nut, and the front end of the screw rod is in threaded connection with the nut through the open end of the nut. The bolt holes in the tunnel segment are small in hole forming difficulty, only the bolt mounting grooves need to be formed in one end of the annular inner wall of the segment, the nuts need to be embedded in concrete at the other end of the annular inner wall of the segment, the number of annular grooves and holes of the segment can be reduced, and the influence on the stress performance of the segment is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of highway tunnel construction and relates to a bolt used for connecting highway tunnel segments. Background Art

[0002] The prefabricated tunnel lining structure is a layer of prefabricated concrete segments installed on the inner wall of the tunnel, with adjacent segments connected by bolts. Figure 1 The figure shows a schematic diagram of a tunnel segment connected by bolts. Because the segments 100 have a certain curvature, curved bolts 200 are used as connecting bolts. During segment prefabrication, multiple bolt mounting slots 101 are provided on the inner walls of each segment 100 at both ends. Curved bolt holes 102 are located between the bolt mounting slots and the end faces of the segments. During segment installation, after the end faces of two adjacent segments are aligned, curved bolts 200 are inserted through the bolt mounting slots into the bolt holes that connect the two segments, tightening the two segments 100.

[0003] The above connection structure is more applicable to the connection of pipe segments in subway and railway tunnels. Compared with subway and railway tunnels, the circular curve radius of highway tunnels is relatively large. Tunnel pipe segments have the characteristics of small curvature, thin pipe segment thickness, and small block size. The pipe segments are also connected circumferentially with arc-shaped bolts. Not only is it difficult to set arc-shaped bolt holes on the pipe segments, but the number of holes and grooves on the pipe segments is relatively large, which will reduce the stress-bearing performance of the pipe segments. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems and provide a highway tunnel segment connecting bolt to reduce the difficulty of drilling bolt holes on the segments and avoid affecting the strength of the segments.

[0005] The technical solution of the utility model is as follows:

[0006] A highway tunnel segment connecting bolt comprises a screw and a nut, and is characterized in that: the front half of the screw is a threaded section with threads on the outer wall, the rear half is an anchoring section with no threads on the outer wall, the rear end of the screw is provided with a hexagonal end, one end of the nut is open and the other end is closed, at least two circumferential anti-extraction tooth plates are provided on the outer wall of the nut, and the front end of the screw is threadedly connected to the nut through the open end of the nut.

[0007] This new design uses straight bolts to connect tunnel segments, making it easier to drill bolt holes. Furthermore, only a bolt mounting slot is required on one end of the circumferential inner wall of the segment, with nuts embedded in the concrete at the other end. This reduces the number of slots and holes required around the segment, minimizing the impact on segment strength. This design is also simpler to install than curved bolts, improving segment installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1This is a schematic diagram of the structure in which existing segments are connected by arc bolts;

[0009] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0010] Figure 3 This is a schematic diagram of the split structure of the utility model;

[0011] Figure 4 This is a longitudinal sectional view of the usage of the utility model;

[0012] Figure 5 It is a three-dimensional diagram of the usage of the utility model. DETAILED DESCRIPTION

[0013] like Figure 2 、 Figure 3 As shown, the utility model includes a screw 1 and a nut 2. The front half of the screw 1 is a threaded section 11 with a thread on the outer wall, and the rear half is an anchoring section 12 with no thread on the outer wall. A hexagonal end 13 is provided at the rear end of the screw. The nut is a long nut with an open end and a closed end. At least two circumferential anti-extraction tooth plates 21 are provided on the outer wall of the nut 2. The threaded section at the front end of the screw 1 is threadedly connected to the nut through the open end of the nut 2.

[0014] like Figure 4 、 Figure 5 As shown, during prefabrication of tunnel segments connected using the present invention, a bolt mounting slot 101 is provided on the inner wall of one end of a segment 100, with a bolt hole 102 located between the bolt mounting slot and the segment end face. A nut 2 is embedded in the concrete at the other end of the segment 100 and welded to the segment's steel reinforcement. The nut's open end is located on the segment end face, while the closed end prevents concrete from entering the nut. Circumferential anti-extraction toothed plates 21 on the outer wall of the nut 2 increase the contact surface between the nut and the concrete, enhancing the nut's extraction resistance. During installation in the tunnel, one end of the bolt mounting slot 101 in one segment is aligned with one end of the embedded nut 2 in the other segment. A screw rod 1 is inserted into the bolt mounting slot of one segment and screwed to the nut 2 in the other segment, securing the two segments 100. After the bolts are installed, grouting is injected into the bolt holes to consolidate the screw rod's anchoring section into the segment concrete. The bolt mounting slots are then filled with high-grade concrete.

[0015] Since the rear end of the nut 2 is closed, when the screw 1 is screwed into the nut 2, if the air in the nut cannot be discharged, as the screw is screwed into the nut 2, the air pressure in the nut will make it difficult to screw the screw in as the screw is screwed into the depth. To avoid the above problem, during the specific implementation of the present invention, an exhaust hole 14 with two ends passing through can be provided in the center of the screw 1 along the axial direction. When the screw is screwed into the nut, the air in the nut can be discharged from the exhaust hole 14 on the bolt.

[0016] During the specific implementation of the present invention, in order to further enhance the pull-out resistance of the nut, the nut 2 can be set to be conical, and the cross section of the nut 2 gradually increases from the open end to the closed end.

Claims

1. A highway tunnel segment connecting bolt, comprising a screw and a nut, characterized in that: The front half of the screw is a threaded section with threads on the outer wall, and the back half is an anchoring section with no threads on the outer wall. A hexagonal end is provided at the rear end of the screw. One end of the nut is open and the other end is closed. At least two circumferential anti-extraction tooth plates are provided on the outer wall of the nut. The front end of the screw is threadedly connected to the nut through the open end of the nut.

2. The highway tunnel segment connecting bolt according to claim 1, characterized in that: The center of the screw is provided with an exhaust hole with two ends passing through along the axial direction.

3. The highway tunnel segment connecting bolt according to claim 1, characterized in that: The nut is conical, and its cross section gradually increases from the open end to the closed end.

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