Shield tunnel segment tensioning device

Abstract

The utility model discloses a shield tunnel duct piece tensioning device and aims to solve the problems that in the prior art, a duct piece tensioning process is uneven in tension and poor in effect, and a tensioning device is prone to deformation and poor in stability. The tensioning device comprises an annular tensioning assembly fixed to the inner wall of a duct piece and a longitudinal tensioning assembly fixed to the annular tensioning assembly; the annular tensioning assembly comprises a reserved plate fixed to the inner wall of the duct piece and tensioning rings fixed to the fixed plate. The longitudinal tensioning assembly comprises longitudinal tensioning pieces connected between the tensioning rings. During installation, the annular tensioning assembly and the longitudinal tensioning assembly are fixed to a reserved plate on the pipe piece, so that the annular tensioning assembly, the longitudinal tensioning assembly, the reserved plate and the pipe piece form an integral structure. The device is stable in structure and not prone to deformation, the duct piece can be evenly stressed, and the final forming quality of the duct piece is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of tunnel construction, and particularly to a tightened device for segments of shield tunnel. Background Art

[0002] Since shield machines for tunnel construction have the characteristics of high automation, labor saving, fast construction speed, one-time tunneling, not affected by climate, controllable ground settlement during excavation, reduced impact on ground buildings, and no impact on water surface traffic during underwater excavation, shield construction has been widely applied to underground projects. With the development of the tunnel construction industry, while the construction speed of shield tunnels is getting faster and faster, more and more attention is paid to the project quality. And the installation and forming quality of segments in the initial tunneling section of shield tunnels is one of the most important factors affecting the quality of tunnel projects.

[0003] Among them, one of the reasons that can most affect the installation and forming quality of segments is that after the shield starts tunneling and the reaction support system is removed, the positive ring segments will lose support, resulting in the problem of segment relaxation, which will further cause the adverse effect of poor segment sealing effect. At the same time, under the long-term action of surrounding geological disturbances, segment misalignment may also occur, affecting the project quality.

[0004] In the face of this series of problems, the traditional solution is to use a longitudinal tightening device for shield tunnel segments composed of steel strands, traction devices and maintaining devices or a longitudinal tightening device composed of channel steels. However, with continuous application in shield construction, many deficiencies of the longitudinal tightening device have gradually emerged. Although both the wire rope tightening device and the channel steel tightening device provide longitudinal tension for the segments, the wire rope tightening device completely depends on the operator's feel for wire rope tightening, and the tightening force is uncertain and uneven, so the effect of the wire rope tightening device is limited. Moreover, since the channel steel tightening device is a mechanical limit and can only play a role in longitudinal connection, the tightening force is limited, so the installation and forming quality of the segments is also poor. Therefore, neither the wire rope tightening device nor the channel steel tightening device is a perfect solution, and there are still many problems that need to be solved urgently.

[0005] The information disclosed in this background art section is only used to deepen the understanding of the background art of the present disclosure, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, the present disclosure provides a tightened device for segments of shield tunnel, aiming to solve the problems of uneven tension, poor effect, easy deformation and poor stability of the segment tightening process in the prior art.

[0007] According to one aspect of the present disclosure, a segment tensioning device for a shield tunnel is provided, which includes a circumferential tensioning assembly fixed to the inner wall of the segment and a longitudinal tensioning assembly fixed to the circumferential tensioning assembly. The circumferential tensioning assembly includes a reserved plate fixed to the inner wall of the segment and a tensioning ring fixed to the reserved plate. The longitudinal tensioning assembly includes a longitudinal tensioning member connected between the tensioning rings.

[0008] In some embodiments of the present disclosure, the segment tensioning device for a shield tunnel further includes segment bolts that match the screw holes on the inner wall of the segment.

[0009] In some embodiments of the present disclosure, screw holes that match the segment bolts are provided on the reserved plate, and the reserved plate is fixed to the inner wall of the segment through the segment bolts.

[0010] In some embodiments of the present disclosure, the longitudinal tensioning member is vertically fixed between the tensioning rings.

[0011] In some embodiments of the present disclosure, the longitudinal tensioning member is further fixed to the reserved plate so that the circumferential tensioning assembly and the longitudinal tensioning assembly are integrally formed.

[0012] In some embodiments of the present disclosure, the tensioning ring is an integral circular structure.

[0013] In some embodiments of the present disclosure, the size of the tensioning ring is smaller than the size of the inner wall of the segment and is close to the inner wall of the segment.

[0014] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:

[0015] 1. Since the device is simple to disassemble and can be reused, it effectively saves economic costs and improves construction efficiency. Moreover, the device only needs to utilize the screw holes on the segment to perform the segment tensioning work, avoiding damage to the segment structure, improving the stability of the segment structure, and ensuring the construction quality.

[0016] 2. Since the size of the tensioning ring needs to be designed according to the inner diameter size of the assembled segment, the tensioning ring is close to the inner arc surface of the segment. Compared with the size design of the prior art, such a design can reduce the adverse factors brought by the device itself and better provide circumferential binding force for the segment, ensuring the forming quality of the segment.

[0017] 3. In the present application, the tensioning ring and the longitudinal tensioning member are connected by welding into an integral structure, which is not only firm and not easy to deform, but also provides stable and uniform longitudinal and circumferential binding forces for the segment, ensuring the final quality of the tunnel project.

[0018] 4. The segment bolts connection adopted in this application can not only connect and fix the segments, but also, through the reserved plate, have multiple stress points on each ring of segments, making the segments stressed evenly, solving the problems of insufficient structural stability of the existing device and easy deformation of the tensioning device, and ensuring the final forming quality of the segments. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the installation state of the segment tensioning device in a shield tunnel in an embodiment of this application.

[0020] Figure 2 It is a front view of the segment tensioning device in a shield tunnel in an embodiment of this application.

[0021] Figure 3 It is a schematic structural diagram of the segment tensioning device in a shield tunnel in an embodiment of this application.

[0022] Figure 4 It is a side view of the segment tensioning device in a shield tunnel in an embodiment of this application.

[0023] In the above figures, 11 is the reserved plate, 12 is the segment bolt, 13 is the tensioning ring, 2 is the longitudinal tensioning member, and 3 is the inner wall of the segment. Detailed Embodiment

[0024] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The "first", "second", etc. involved in this application are used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" involved in this application, unless otherwise specified, all include direct and indirect connections (couplings).

[0025] The embodiment of this application provides a segment tensioning device for a shield tunnel, solving the problems of uneven tension, poor effect, easy deformation and poor stability of the segment tensioning process in the prior art. To better understand the technical solution of this application, the above technical solution will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0026] This example discloses a segment tensioning device for a shield tunnel, see Figures 2 to 4, specifically including a hoop tensioning assembly fixed on the inner wall 3 of the segment, and a longitudinal tensioning assembly connected to the hoop tensioning assembly. The hoop tensioning assembly includes a reserved plate 11 fixed on the inner wall 3 of the segment, and a tensioning ring 13 fixed on the reserved plate 11; the longitudinal tensioning assembly includes a longitudinal tensioning member 2 fixed between the tensioning rings 13. In this embodiment, the reserved plate 11 is made of steel plate; the tensioning ring 13 is made of an integrated circular channel steel, which corresponds to the inner diameter of the segment and is circumferentially welded to the reserved plate 11 so that it is tightly attached to the inner wall of the segment. In this way, the circular channel steel can provide good circumferential constraints on the segment, preventing the segment from being misaligned due to the surrounding geological factors; the longitudinal tensioning member 2 is made of straight channel steel, which is vertically welded between the tensioning rings 13 and also welded to the reserved plate 11. The longitudinal straight channel steel provides longitudinal tension to the segment, preventing the segment from loosening after the reaction support system is removed, thereby causing adverse factors such as poor sealing effect. At the same time, since the tensioning ring 13 and the longitudinal tensioning member 2 are interconnected, the device becomes an integral force-bearing structure, so that the pipe segment is evenly stressed and the tension is stable. This can effectively prevent the device from being subjected to insufficient structural stability due to long-term fatigue loads, causing deformation of the tensioning device, causing the pipe segment to misalign, and other adverse effects that affect the final forming quality of the pipe segment.

[0027] See also Figure 3 The device also includes segment bolts 12, the size of which matches the screw holes on the segment inner wall 3, and the reserved plate 11 is also provided with screw holes corresponding to the segment bolts 12, and the reserved plate 11 is rotated and pressed by the segment bolts 12 to fix the reserved plate 11 on the segment inner wall 3. The connection through the segment bolts 12 can not only fix the segment, but also install the reserved plate 11 on the segment at the same time, so that there are multiple stress points on each ring of the segment, so that the segment is evenly stressed, which solves the problem of insufficient structural stability of other devices in the prior art and deformation of the tensioning device due to uneven stress, and ensures the final forming quality of the segment.

[0028] See also Figure 1, after the segment of the shield machine is completed and the reaction support system is removed, it will cause the segment to become loose. Therefore, at the adjacent ten segments, through the screw holes on the inner wall of the segment, by the action of the segment bolts 12, the reserved plate 11 is pressed and fixed on the inner wall 3 of the segment; then, the tension ring 13 is welded to the reserved plate 11, so that the tension ring 13, the reserved plate 11, the segment bolts 12 and the segment become a structural whole; through the structural performance of the tension ring 13 itself, it can not only prevent the segment from displacing in the circumferential direction, but also provide a reverse acting force for the circumferential acting force received by the segment at the same time, so as to provide a circumferential constraint for the segment and prevent the segment from staggering; then, the longitudinal tension member 2 is vertically welded between the tension rings 13 and is welded to the reserved plate 11 at the same time. By the action of the segment bolts 12, the longitudinal tension member 2, the tension ring 13, the reserved plate 11 and the segment form a structural whole; and through the structural performance of the longitudinal tension member 2 itself, it can prevent the segment from displacing in the longitudinal direction and provide a reverse constraint acting force for the segment with a tendency to become loose, so as to avoid the longitudinal loosening of the segment. Finally, when the tunnel construction is completed, only the segment bolts 12 need to be removed, and the device is disassembled for repeated use, thus saving economic costs and improving construction efficiency.

[0029] Although some preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0030] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of its invention. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A segment tensioning device for shield tunnels, characterized in that, It includes a circumferential tensioning assembly fixed on the inner wall of the segment and a longitudinal tensioning assembly fixed on the circumferential tensioning assembly. The circumferential tensioning assembly includes a reserved plate fixed on the inner wall of the segment and a tensioning ring fixed on the reserved plate. The longitudinal tensioning assembly includes a longitudinal tensioning member connected between the tensioning rings.

2. The segment tensioning device for shield tunnel according to claim 1, wherein It further includes segment bolts matching the screw holes on the inner wall of the segment.

3. The segment tensioning device for shield tunnels according to claim 2, characterized in that, Screw holes matching the segment bolts are provided on the reserved plate, and the reserved plate is fixed on the inner wall of the segment through the segment bolts.

4. The segment tensioning device for shield tunnels according to claim 1, characterized in that, The longitudinal tensioning member is vertically fixed between the tensioning rings.

5. The segment tensioning device for shield tunnel according to claim 4, characterized in that, The longitudinal tensioning member is also fixed to the reserved plate so that the circumferential tensioning assembly and the longitudinal tensioning assembly are integrally formed.

6. The segment tensioning device for shield tunnel according to claim 1, wherein, The tensioning ring is an integral circular structure.

7. The segment tensioning device for shield tunnels according to claim 6, wherein The size of the tensioning ring is smaller than the size of the inner wall of the segment and is closely attached to the inner wall of the segment.

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