External bolt prestress tensioning device suitable for tunnel segment joint

Abstract

The invention relates to the field of building structure reinforcement, in particular to an external bolt prestress tensioning device suitable for a tunnel segment joint. Comprising a fixed end mechanism, a tensioning end mechanism, a cambered surface self-adaptive bolt, a prestress bolt and a locking nut, the fixed end mechanism and the tensioning end mechanism each comprise a horizontal supporting plate, and the bottoms of the ends, away from each other, of the two horizontal supporting plates are fixedly connected with vertical supporting plates correspondingly; a screw rod part of the prestress bolt sequentially penetrates through a through hole in the vertical supporting plate of the fixing end mechanism and a through hole in the vertical supporting plate of the tensioning end mechanism and is provided with a locking nut, the tops of the ends, away from each other, of the two horizontal supporting plates are fixedly connected with lug plates correspondingly, and fixing holes are formed in the two lug plates correspondingly. The device provided by the invention is completely fixed on the surface of the to-be-reinforced structure in a mechanical contact mode, destructive drilling on the structure is not needed, and damage to the interior of the structure is avoided.

Description

Technical Field

[0001] The invention relates to the field of building structure reinforcement, and in particular to an external bolt prestressing tensioning device suitable for tunnel segment joints. Background Art

[0002] Shield tunneling is widely used for the construction of underground tunnels in urban areas due to its flexibility, cost-effectiveness and minimal impact on the surrounding environment. Shield tunnels are usually lined with concrete segments, which are placed side by side in a row as the tunnel boring machine (TBM) advances. One of the most important factors in the design of segmental tunnel linings is the effect of the longitudinal joints on the overall performance of the structure. During tunnel operation, the structural performance of the concrete segment lining may be further affected by external factors such as nearby deep excavation, new cross tunnels, differential settlement in soft soil strata, and unexpected ground loading. In such cases, the performance of the concrete segment lining, especially the longitudinal joints, needs to be reinforced or strengthened to ensure structural safety.

[0003] The existing external prestressing tensioning device is mainly designed for structures with sufficient construction space and regular flat shapes. The tensioning method is usually to tension external prestressed tendons or external prestressed plates, and steel or carbon fiber materials are usually selected for materials. Although the existing device can well complete the external prestressing work and the application effect is also relatively good, for curved structures such as shield subway tunnels, due to the small overall construction space and the lack of a flat surface, the traditional external prestressing device is difficult to operate on such structures. In addition, the current external prestressing reinforcement technology usually requires drilling and planting reinforcement in the reinforced structure to provide an anchoring foundation for the fixation of the prestressing loading device. However, for the high water pressure penetration environment such as underground or underwater tunnel segments, this drilling may cause microcracks to form and expand inside the segment concrete, increase the risk of water seepage, and thus reduce the durability and safety of the segment. Therefore, even if the existing external prestressing reinforcement technology is successfully installed in such structures, its practicality is not strong.

[0004] For example, patent CN117449608B discloses an automatic leveling carbon fiber plate prestressing tensioning device for curved surface structures. Although it can be used for curved surface structures, the device requires drilling and planting reinforcement in the curved surface structure, which will increase the risk of water seepage in underground structures. In addition, the device disclosed in the invention occupies a large space and is also difficult to use for structures such as shield subway tunnels.

[0005] In summary, the existing external prestressed reinforcement structure is not very applicable to the tunnel segments based on bolt connection, and it is difficult to achieve non-destructive prestressing. Therefore, how to provide a non-destructive, efficient and convenient construction of tunnel segment joint reinforcement body external prestressing device and supporting technology is a problem that technicians in this field need to solve urgently. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides an external bolt prestressing tensioning device suitable for tunnel segment joints, and specifically discloses the following technical solutions:

[0007] An external bolt prestressing tensioning device suitable for tunnel segment joints comprises a fixed end mechanism, a tensioning end mechanism, an arc surface adaptive bolt, a prestressed bolt and a locking nut, wherein the fixed end mechanism and the tensioning end mechanism both comprise a horizontal support plate, and the bottoms of the ends of the two horizontal support plates which are away from each other are respectively fixedly connected with vertical support plates, the screw portions of the prestressed bolts successively pass through the through holes on the vertical support plate of the fixed end mechanism and the through holes on the vertical support plate of the tensioning end mechanism and are installed with locking nuts, and the tops of the ends of the two horizontal support plates which are away from each other are respectively fixedly connected with ear plates, and fixing holes are provided on both ear plates.

[0008] Furthermore, side plates are fixedly connected between the two sides of the vertical support plate and the bottoms of the two sides of the horizontal support plate, and the two side plates are parallel to each other.

[0009] Furthermore, the diameters of the through holes on the two vertical support plates are both larger than the nominal diameter of the prestressed bolts.

[0010] Furthermore, a leveling gasket is arranged between the locking nut and the vertical support plate of the tensioning end mechanism, the leveling gasket is sleeved on the prestressed bolt, the side of the leveling gasket close to the vertical support plate of the tensioning end mechanism is set to a spherical surface, and a groove matching the spherical surface of the leveling gasket is arranged on the periphery of the through hole on the vertical support plate of the tensioning end mechanism.

[0011] Furthermore, the two horizontal support plates are each provided with a plurality of bolt holes, and the plurality of arc surface adaptive bolts respectively pass through the corresponding bolt holes from bottom to top, and the top ends of the arc surface adaptive bolts are used to contact the arc surface of the structure to be reinforced.

[0012] Furthermore, the bottom end of the ear plate is fixedly connected to the top end of the horizontal support plate, and the top end of the ear plate is inclined outward.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The device provided by the present invention is fixed to the surface of the structure to be reinforced completely by mechanical contact, without the need for destructive drilling of the structure, thus avoiding damage to the interior of the structure;

[0015] In the present invention, a plurality of arc surface adaptive bolts are installed on the horizontal support plate, and the height of each arc surface adaptive bolt is adjusted respectively so that the bolts can fit and adapt to arc surfaces of different shapes;

[0016] The aperture of the through hole on the vertical support plate is larger than the nominal diameter of the prestressed bolt, and a leveling gasket is arranged between the locking nut and the vertical support plate of the tensioning end mechanism, and the side of the leveling gasket close to the vertical support plate is arranged as a spherical surface, and a groove matching the spherical surface of the leveling gasket is arranged on the periphery of the through hole on the vertical support plate, and the leveling gasket can form a ball joint structure at the groove, which can be rotated within a certain range, so that the prestressed bolt can automatically eliminate the position deviation caused by the installation through the rotation of the leveling gasket during installation, and finally play the function of adaptive leveling of the device;

[0017] The device of the present invention is small in size, and the application of prestress can be completed by tightening the locking nut with an electric wrench or a digital wrench. It is easy to operate and does not require additional large equipment such as a jack or an oil pump. Therefore, it can be easily installed and function in a narrow space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is the front view of the present invention.

[0020] Figure 3 It is a top view of the present invention.

[0021] Figure 4 It is a structural schematic diagram of the fixed end mechanism in the present invention.

[0022] Figure 5 It is the front view of the fixed end mechanism in the present invention.

[0023] Figure 6 It is a top view of the fixed end mechanism in the present invention.

[0024] Figure 7 It is a structural schematic diagram of the tensioning end mechanism in the present invention.

[0025] Figure 8 It is a schematic diagram of the structure of the leveling gasket in the present invention.

[0026] Fig. 9 It is the front view of the leveling gasket in the present invention.

[0027] Fig.10It is a top view of the leveling gasket in the present invention.

[0028] Fig.11 It is a schematic diagram of the disassembled structure of the tensioning end mechanism and the leveling gasket in the present invention.

[0029] Fig.12 This is a front view of the tensioning end mechanism and the leveling gasket after being assembled in the present invention.

[0030] Fig.13 It is a structural schematic diagram of the prestressed bolt in the present invention.

[0031] Fig.14 A schematic diagram of the installation of the present invention in a subway tunnel segment.

[0032] In the figure: 1-tensioning end mechanism; 2-leveling gasket; 3-arc surface adaptive bolt; 4-fixed end mechanism; 5-prestressed bolt; 6-locking nut; 7-segment on the left side of the joint; 8-segment on the right side of the joint; 9-segment joint bolt. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Reference Figure 1-14 , an external bolt prestressing tensioning device suitable for tunnel segment joints, comprising a fixed end mechanism 4, a tensioning end mechanism 1, an arc surface adaptive bolt 3, a prestressed bolt 5 and a locking nut 6, the fixed end mechanism 4 and the tensioning end mechanism 1 each comprise a horizontal support plate, the bottom of the ends of the two horizontal support plates away from each other are respectively fixedly connected with vertical support plates, the screw rod portions of the prestressed bolt 5 pass through the through holes on the vertical support plate of the fixed end mechanism 4 and the through holes on the vertical support plate of the tensioning end mechanism 1 in turn and are installed with locking nuts 6, the tops of the ends of the two horizontal support plates away from each other are respectively fixedly connected with ear plates, both ear plates are provided with fixing holes, the fixing holes are used to cooperate with the fixing bolts on the structure to be reinforced, thereby realizing the fixation of the fixed end mechanism 4 and the tensioning end mechanism 1 to the structure to be reinforced.

[0035] By tightening the locking nut 6, the fixed end mechanism 4 and the tensioning end mechanism 1 can respectively drive the corresponding structure to be reinforced to move toward each other, thereby suppressing the opening deformation of the structure to be reinforced and reinforcing the structure to be reinforced.

[0036] In this embodiment, side plates are fixedly connected between the two sides of the vertical support plate and the two side bottoms of the horizontal support plate, and the two side plates are parallel to each other. The provision of two side plates can increase the connection strength and stability between the vertical support plate and the horizontal support plate, thereby improving the overall strength and stability of the fixed end mechanism 4 and the tensioning end mechanism 1.

[0037] In this embodiment, the apertures of the through holes on the two vertical support plates are larger than the nominal diameter of the prestressed bolts 5; a leveling gasket 2 is provided between the locking nut 6 and the vertical support plate of the tensioning end mechanism 1, and the leveling gasket 2 is sleeved on the prestressed bolt 5. The side of the leveling gasket 2 close to the vertical support plate of the tensioning end mechanism 1 is set as a spherical surface, and a groove matching the spherical surface of the leveling gasket 2 is provided on the periphery of the through hole on the vertical support plate of the tensioning end mechanism 1. The leveling gasket 2 can form a ball joint structure at the groove, which can be rotated within a certain range, so that the prestressed bolt 5 can automatically eliminate the position deviation caused by the installation by rotating the leveling gasket 2 during installation, and finally play the function of adaptive leveling of the device.

[0038] In this embodiment, a plurality of bolt holes are provided on the two horizontal support plates, and a plurality of arc surface adaptive bolts 3 pass through the corresponding bolt holes from bottom to top, and the arc surface adaptive bolts 3 are threadedly connected to the corresponding bolt holes, and the top of the arc surface adaptive bolts 3 is used to contact the arc surface of the structure to be reinforced. By adjusting the height of each arc surface adaptive bolt 3, it can fit and adapt to arc surfaces of different shapes.

[0039] In this embodiment, the bottom end of the ear plate is fixedly connected to the top end of the horizontal support plate, and the top end of the ear plate is inclined outward.

[0040] The working principle of the present invention is:

[0041] First, the ear plates of the fixed end mechanism 4 and the tensioning end mechanism 1 are respectively mounted on the corresponding pipe segment joint bolts 9 through the fixing holes, and then the arc surface adaptive bolts 3 on the fixed end mechanism 4 and the tensioning end mechanism 1 are adjusted so that the fixed end mechanism 4 and the tensioning end mechanism 1 are respectively clamped on the left pipe segment 7 and the right pipe segment 8 of the joint under the cooperation of the ear plates and the arc surface adaptive bolts 3, thereby completing the preliminary fixation of the fixed end mechanism 4 and the tensioning end mechanism 1.

[0042] Subsequently, the leveling gasket 2 is placed in the groove of the tensioning end mechanism 1, and the prestressed bolts 5 are passed through the fixed end mechanism 4, the tensioning end mechanism 1 and the preset through holes on the leveling gasket 2 in turn, and are preliminarily fixed with the locking nuts 6 to complete the installation of the device.

[0043] Finally, according to the required prestress, set the appropriate torque and tighten the locking nut 6 with an electric wrench or a digital wrench to complete the application of prestress, thereby restoring the deformation of the segment joint and improving the overall strength and stiffness of the joint structure.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An external bolt prestressing tensioning device suitable for tunnel segment joints, characterized in that: It includes a fixed end mechanism, a tensioning end mechanism, an arc-surface adaptive bolt, a prestressed bolt and a locking nut. The fixed end mechanism and the tensioning end mechanism both include a horizontal support plate. The bottoms of the ends of the two horizontal support plates that are away from each other are fixedly connected with vertical support plates respectively. The screw parts of the prestressed bolts pass through the through holes on the vertical support plate of the fixed end mechanism and the through holes on the vertical support plate of the tensioning end mechanism in sequence and are installed with locking nuts. The tops of the ends of the two horizontal support plates that are away from each other are fixedly connected with ear plates respectively, and fixing holes are provided on the two ear plates.

2. The external bolt prestressing tensioning device suitable for tunnel segment joints according to claim 1 is characterized in that: Side plates are respectively fixedly connected between the two sides of the vertical support plate and the bottoms of the two sides of the horizontal support plate, and the two side plates are parallel to each other.

3. The external bolt prestressing tensioning device suitable for tunnel segment joints according to claim 1 is characterized in that: The diameters of the through holes on the two vertical support plates are both larger than the nominal diameter of the prestressed bolts.

4. The external bolt prestressing tensioning device suitable for tunnel segment joints according to claim 3 is characterized in that: A leveling gasket is arranged between the locking nut and the vertical support plate of the tensioning end mechanism, and the leveling gasket is sleeved on the prestressed bolt. The side of the leveling gasket close to the vertical support plate of the tensioning end mechanism is set to a spherical surface, and a groove matching the spherical surface of the leveling gasket is arranged on the periphery of the through hole on the vertical support plate of the tensioning end mechanism.

5. The external bolt prestressing tensioning device suitable for tunnel segment joints according to claim 1 is characterized in that: A plurality of bolt holes are provided on the two horizontal support plates, and a plurality of the arc surface adaptive bolts respectively pass through the corresponding bolt holes from bottom to top, and the top ends of the arc surface adaptive bolts are used to contact the arc surface of the structure to be reinforced.

6. The external bolt prestressing tensioning device suitable for tunnel segment joints according to claim 1, characterized in that: The bottom end of the ear plate is fixedly connected to the top end of the horizontal support plate, and the top end of the ear plate is inclined outward.

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