Prestressed steel strand tensioning device for tunnel reinforcement

Abstract

The utility model belongs to the technical field of anchor cable prestress tensioning, and discloses a prestress steel strand tensioning device for tunnel reinforcement, which comprises a tensioning machine main machine and a center hole jack, a bearing plate is arranged below the tensioning machine main machine, a first cantilever is arranged on one side of the bearing plate, and a second cantilever is arranged on the other side of the bearing plate. A rotating structure is arranged at the joint of the bearing plate and the first cantilever, a second cantilever is arranged at the end, away from the bearing plate, of the first cantilever, the first cantilever and the second cantilever are connected in a hinged mode through a hinge structure, and a jack fixing kit is arranged on the second cantilever. The anchor cable pre-stress tensioning device is compact and reasonable in structural design, an anchor cable can be fixed to the cross-core jack through an anchorage device clamping piece and the like, anchor cable pre-stress tensioning operation can be carried out, the cross-core jack does not need to be lifted frequently, use is convenient, the applicability is wide, and the anchor cable pre-stress tensioning device is suitable for popularization and application. And the working efficiency can be greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of anchor cable prestressing tensioning technology, specifically a prestressed steel strand tensioning device for tunnel reinforcement. Background Technology

[0002] With the booming development of transportation infrastructure construction, tunnel engineering, as a key component, plays an indispensable role in traversing complex terrains such as mountains and rivers. Tunnel construction not only shortens transportation routes and improves efficiency but also effectively reduces damage to the natural environment. However, tunnel construction faces numerous challenges, among which ensuring the stability of the surrounding rock is of paramount importance.

[0003] During tunnel construction, excavation disrupts the original stress balance of the strata, leading to safety hazards such as deformation and collapse of the surrounding rock. To ensure the safety of tunnel construction and its long-term stable operation, anchor cable support technology is widely used. Anchor cable support is an active support method that uses anchor cables to secure stable surrounding rock, applying restraint through the tension of the anchor cables to effectively control rock deformation and improve the self-stabilizing capacity of the surrounding rock. Anchor cables act like the "skeleton" of the tunnel, tightly connecting unstable surrounding rock with stable rock mass, allowing them to jointly bear external loads and ensuring the safety and reliability of the tunnel structure.

[0004] Before anchor cables can provide support, they need to be prestressed. Prestressing is a crucial step in anchor cable construction. By applying a certain amount of prestress to the anchor cables, they are placed in a tensile state before bearing loads, thus activating the self-supporting capacity of the surrounding rock in advance and enhancing the collaborative performance between the anchor cables and the surrounding rock. Simultaneously, prestressing can effectively reduce anchor cable deformation during use, improving their durability and reliability. A reasonable prestress value allows the anchor cables to better adapt to the stress characteristics of the tunnel's surrounding rock, maximizing their support effect and providing strong assurance for the long-term stability of the tunnel.

[0005] However, several problems urgently need to be addressed in existing anchor cable tensioning operations. Currently, operators need to raise the jacks to the anchor cables and accurately align them during anchor cable tensioning. This process is extremely cumbersome and consumes a significant amount of manpower and time. First, in tunnel construction environments, space is often confined, and construction equipment and materials are piled up, greatly hindering the movement and lifting of jacks. Operators must carefully move the jacks to the designated position, which not only increases labor intensity but also increases the risk of safety accidents. Second, because the positions and angles of anchor cables within the tunnel vary, accurately aligning the jacks is not easy. Operators need to repeatedly adjust the position and angle of the jacks, a process that often consumes a considerable amount of time and severely impacts construction progress.

[0006] Furthermore, frequent lifting of the jacks can accelerate equipment wear, increasing maintenance costs and failure rates. Moreover, prolonged high-intensity work can easily lead to operator fatigue, reducing work efficiency and operational accuracy, further affecting the quality of anchor cable tensioning. These problems not only restrict the progress and efficiency of tunnel construction but also increase project costs and safety risks. Therefore, developing a tensioning device that simplifies the anchor cable tensioning process, improves work efficiency, and reduces labor intensity is of significant practical importance and is an inevitable requirement for promoting the advancement and development of tunnel engineering technology. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this utility model provides a prestressed steel strand tensioning device for tunnel reinforcement, which solves the problems mentioned in the background art, such as excessive effort required by operators during anchor cable tensioning operations, thus affecting work efficiency.

[0009] (II) Technical Solution

[0010] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a prestressed steel strand tensioning device for tunnel reinforcement, comprising a tensioning machine main unit and a through-hole jack. A bearing plate is provided below the tensioning machine main unit, a first cantilever is provided on one side of the bearing plate, a rotating structure is provided at the connection between the bearing plate and the first cantilever, a second cantilever is provided at the end of the first cantilever away from the bearing plate, the first cantilever and the second cantilever are hingedly connected by a hinge structure, a jack fixing kit is provided on the second cantilever, and the through-hole jack is fixedly installed below the second cantilever by the jack fixing kit.

[0011] Preferably, the tensioning machine main unit includes an oil tank, a controller, and a drive motor. An oil pump is installed inside the oil tank, and a drive motor for driving the oil pump is installed on the oil tank. A controller is installed on one side of the drive motor, and two sets of oil delivery pipes are installed on one side of the controller. The oil delivery pipes are sealed to the through-hole jack.

[0012] Preferably, the rotating structure includes a fixed shaft, a rotating male ring, a rotating female groove, and a rotating base. The fixed shaft is welded onto the bearing plate, the rotating male ring is provided on the fixed shaft, the rotating base is sleeved on the fixed shaft, the rotating base has a rotating female groove corresponding to the rotating male ring, the rotating male ring is engaged in the rotating female groove, and the side of the rotating base away from the fixed shaft is welded to the first cantilever.

[0013] Preferably, the hinge structure includes a clearance groove, a rotating disk, and a rotating shaft. The first cantilever has a clearance groove at one end away from the bearing plate, and a rotating disk is provided in the clearance groove. The rotating disk is hinged to the first cantilever through the rotating shaft, and one end of the rotating shaft is welded to the second cantilever.

[0014] Preferably, the hinged locking structure includes locking holes and locking ears, multiple sets of locking holes are provided on the rotating shaft, and locking ears are provided on the first cantilever. The rotating shaft is locked and fixed by a pin and locking ears.

[0015] Preferably, the jack fixing kit has a jack fixing hole and a second cantilever through hole. The through jack is fixedly installed in the jack fixing hole. The second cantilever is slidably engaged in the second cantilever through hole. A groove is provided on one side of the second cantilever through hole. A limiting slider corresponding to the groove is provided on the second cantilever. The limiting slider is slidably engaged in the groove. Anti-disengagement stops are provided at both ends of the limiting slider.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a prestressed steel strand tensioning device for tunnel reinforcement, which has the following beneficial effects:

[0018] 1. This prestressed steel strand tensioning device for tunnel reinforcement is equipped with a tensioning host, a through-hole jack, a bearing plate, and first and second cantilever structures. It can fix the anchor cable to the through-hole jack through anchor clamps, etc., and can perform anchor cable prestressing tensioning operations. It does not require frequent lifting of the through-hole jack, is easy to use, has wide applicability, and can greatly improve work efficiency.

[0019] 2. Equipped with a first cantilever and a second cantilever, the through-hole jack is fixed on the cantilever. When performing anchor cable tensioning operations, it is not necessary to use manpower to frequently lift the through-hole jack. It is convenient and labor-saving to use, which can greatly improve the efficiency of anchor cable prestressing tensioning operations and save construction time.

[0020] 3. It is equipped with a hinged structure and a rotating structure, which can adjust the angle and orientation of the through-hole jack, and is suitable for different anchor cable designs. It has a wide range of applications and can greatly improve the practicality of the device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the main body of the tensioning machine of this utility model;

[0023] Figure 3 This is a schematic diagram of the rotating structure of this utility model;

[0024] Figure 4This is a schematic diagram of the hinge structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the jack fixing kit and the second cantilever of this utility model.

[0026] In the diagram: 1. Tensioning machine main unit; 2. Through-hole jack; 3. Bearing plate; 4. First cantilever; 5. Second cantilever; 6. Jack fixing kit; 7. Oil tank; 8. Controller; 9. Drive motor; 10. Oil pipeline; 11. Fixed shaft; 12. Rotating male ring; 13. Rotating female groove; 14. Rotating base; 15. Clearance groove; 16. Rotating disc; 17. Rotating shaft; 18. Locking hole; 19. Locking lug; 20. Jack fixing hole; 21. Second cantilever through-hole; 22. Slide groove; 23. Limiting slider. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-5 This utility model provides a technical solution:

[0029] A prestressed steel strand tensioning device for tunnel reinforcement includes a tensioning machine main unit 1 and a through-hole jack 2. A bearing plate 3 is installed below the tensioning machine main unit 1, and a first cantilever 4 is installed on one side of the bearing plate 3. A rotating structure is provided at the connection between the bearing plate 3 and the first cantilever 4. A second cantilever 5 is installed at the end of the first cantilever 4 opposite to the bearing plate 3. The first cantilever 4 and the second cantilever 5 are hinged together by a hinge structure. A jack fixing kit 6 is installed on the second cantilever 5, and the through-hole jack 2 is fixedly installed below the second cantilever 5 by the jack fixing kit 6. This device is used for prestressed tensioning of tunnel support anchor cables. The bottom of the bearing plate 3 does not have wheels or other structures. For anchor cables with low height in the tunnel, a flatbed cart is recommended, and for anchor cables with high height, a tunnel trolley is recommended. If wheels or other structures are installed, it will be inconvenient to move and fix the device on the tunnel trolley.

[0030] Furthermore, the tensioning machine main unit 1 includes an oil tank 7, a controller 8, and a drive motor 9. An oil pump is installed inside the oil tank 7, and the drive motor 9, which drives the oil pump, is mounted on the oil tank 7. The controller 8 is located on one side of the drive motor 9, and two sets of oil delivery pipes 10 are installed on one side of the controller 8, with the oil delivery pipes 10 being sealed to the through-hole jack 2. The controller 8 is equipped with a pressure gauge and a control valve.

[0031] Furthermore, the rotating structure includes a fixed shaft 11, a rotating male ring 12, a rotating female groove 13, and a rotating base 14. The fixed shaft 11 is welded onto the bearing plate 3, the rotating male ring 12 is mounted on the fixed shaft 11, and the rotating base 14 is sleeved on the fixed shaft 11. The rotating base 14 has a rotating female groove 13 corresponding to the rotating male ring 12, and the rotating male ring 12 is engaged in the rotating female groove 13. The side of the rotating base 14 facing away from the fixed shaft 11 is welded to the first cantilever 4. The first cantilever 4 and the rotating base 14 can rotate coaxially relative to the fixed shaft 11.

[0032] Furthermore, the hinged structure includes a clearance groove 15, a rotating disk 16, and a rotating shaft 17. The first cantilever 4 has a clearance groove 15 at its end opposite to the bearing plate 3. A rotating disk 16 is housed within the clearance groove 15. The rotating disk 16 is hinged to the first cantilever 4 via the rotating shaft 17. One end of the rotating shaft 17 is welded to the second cantilever 5. The second cantilever 5 can rotate relative to the first cantilever 4 via a hinge. This hinged rotation changes the angle between the second cantilever 5 and the first cantilever 4, allowing adjustment of the angle between the through-hole jack 2 and the ground. This device can be used for prestressing anchor cables designed for different angles.

[0033] Furthermore, the hinged locking structure includes locking holes 18 and locking ears 19. Multiple sets of locking holes 18 are provided on the rotating shaft 17, and locking ears 19 are provided on the first cantilever 4. The rotating shaft 17 is locked and fixed by a pin and locking ears 19.

[0034] Furthermore, the jack fixing kit 6 has a jack fixing hole 20 and a second cantilever through hole 21. The through jack 2 is fixedly installed in the jack fixing hole 20. The second cantilever 5 is slidably engaged in the second cantilever through hole 21. A groove 22 is provided on one side of the second cantilever through hole 21. A limiting slider 23 corresponding to the groove 22 is provided on the second cantilever 5. The limiting slider 23 is slidably engaged in the groove 22. Anti-disengagement stops are provided at both ends of the limiting slider 23.

[0035] Structural Description:

[0036] Tensioning machine main unit 1: Provides power and controls the entire tensioning operation, and is the core power and control component of the device. It includes an oil tank 7, a controller 8, and a drive motor 9. The oil pump in the oil tank 7 is driven by the drive motor 9, and the controller 8 controls the operation of the oil pump and monitors the oil pressure.

[0037] Piercing jack 2: Applyes tension to the anchor cable to achieve prestressing tension; it is the actuator that directly acts on the anchor cable. It receives hydraulic oil from the tensioning machine main unit 1 through the oil pipeline 10 to generate tension.

[0038] Support plate 3: Supports the entire device, provides a foundation for the installation of other components, and ensures stable placement of the device. Support plate 3 does not have wheels and must be moved using a flatbed cart or tunnel trolley. Different moving tools are suitable for anchor cables of different heights.

[0039] First cantilever 4: Connects the bearing plate 3 and the second cantilever 5, serving to transmit force and adjust the angle; it is part of the device's angle adjustment structure. One end is connected to the bearing plate 3 via a rotating structure, allowing it to rotate relative to the bearing plate 3; the other end is connected to the second cantilever 5 via a hinged structure.

[0040] Second cantilever 5: Installs a through-hole jack 2, which works in conjunction with the first cantilever 4 to adjust the position and angle of the through-hole jack 2, enabling the device to adapt to different anchor cable working conditions. It is hinged to the first cantilever 4 via a hinged structure, allowing it to rotate relative to the first cantilever 4 and change the angle between them.

[0041] Jack fixing kit 6: Fixes the through-hole jack 2, while allowing the second cantilever 5 to slide within a certain range, facilitating fine-tuning of the jack position. It has a jack fixing hole 20 for fixing the through-hole jack 2, and a second cantilever through hole 21 for the second cantilever 5 to slide and engage.

[0042] Oil tank 7: Stores hydraulic oil to provide power for the through-hole jack 2, ensuring continuous tensioning operations. An internal oil pump, driven by the drive motor 9, supplies hydraulic oil to the through-hole jack 2.

[0043] Controller 8: Controls the operation of the drive motor 9 and the oil pump, monitors oil pressure, and achieves precise control of the tensioning operation. It is equipped with a pressure gauge to provide real-time oil pressure feedback, and operators can control the oil pump operation via control valves.

[0044] Drive motor 9: Drives the oil pump, converting electrical energy into mechanical energy to power the delivery of hydraulic oil. It is mounted on the oil tank 7 and works in conjunction with the controller 8 to ensure the oil pump operates as required.

[0045] Oil pipeline 10: Connects the tensioning machine main unit 1 and the through-hole jack 2, transporting hydraulic oil and transmitting power. It is sealed to the through-hole jack 2 to ensure no hydraulic oil leakage and to enable the through-hole jack 2 to work normally;

[0046] Fixed shaft 11: Provides support and rotation center for the rotating structure, enabling the first cantilever 4 to rotate relative to the bearing plate 3. It is welded to the bearing plate 3 and fitted with a rotating male ring 12 and a rotating base 14.

[0047] Rotating male ring 12: Cooperates with rotating female groove 13 to realize the rotation of the first cantilever 4 relative to the bearing plate 3, ensuring smooth rotation. It is set on the fixed shaft 11 and snapped into the rotating female groove 13 of the rotating base 14;

[0048] Rotating groove 13: Cooperates with rotating male ring 12 to guide rotation and limit the rotation range, ensuring stable operation of the rotating structure. It is formed within the rotating base 14 and corresponds to rotating male ring 12.

[0049] Rotating base 14: connects the first cantilever 4 and the fixed shaft 11, transmits rotational motion, and enables the first cantilever 4 to rotate around the fixed shaft 11. It is sleeved on the fixed shaft 11, and the side facing away from the fixed shaft 11 is welded to the first cantilever 4.

[0050] 15: Provides installation space for the rotating disk 16 and the rotating shaft 17, while avoiding interference during rotation and ensuring the normal operation of the hinge structure. It is located at the end of the first cantilever 4 opposite to the bearing plate 3.

[0051] Rotating disk 16: As a rotating component of the hinged structure, it connects the rotating shaft 17 and the first cantilever 4, enabling the second cantilever 5 to rotate relative to the first cantilever 4. It is disposed within the clearance groove 15 and is hinged to the first cantilever 4 via the rotating shaft 17.

[0052] Rotating shaft 17: connects the first cantilever 4 and the second cantilever 5, enabling hinged rotation between them, and also serves as part of the hinged locking structure. One end is connected to the rotating disk 16, and the other end is welded to the second cantilever 5. A locking hole 18 is provided on the shaft.

[0053] Locking hole 18: Cooperates with locking lug 19 to fix rotating shaft 17 via a pin, preventing the angle of the second cantilever 5 from changing during tensioning operations. Multiple sets are provided on rotating shaft 17 for easy adjustment and fixing at different angles.

[0054] Locking lug 19: Cooperates with locking hole 18 to lock and fix rotating shaft 17 via a pin, ensuring angular stability of the device during operation. It is mounted on the first cantilever 4, corresponding to the locking hole 18 on rotating shaft 17.

[0055] Jack fixing hole 20: This hole secures the through-hole jack 2, ensuring its stable position and preventing displacement during tensioning operations. It is located on the jack fixing kit 6, and the through-hole jack 2 is installed within it.

[0056] Second cantilever through-hole 21: Provides a sliding engagement point for the second cantilever 5, allowing it to slide within the jack fixing kit 6 for easy fine-tuning of the position of the through-hole jack 2. It is formed on the jack fixing kit 6 and mates with the second cantilever 5.

[0057] Slide groove 22: Cooperates with the limiting slider 23 to restrict the sliding direction and range of the second cantilever 5, while ensuring the stability of the sliding and preventing the second cantilever 5 from dislodging. It is formed on one side of the second cantilever through hole 21.

[0058] Limiting slider 23: Cooperates with slide groove 22 to ensure the sliding of the second cantilever 5 while preventing it from dislodging, thus ensuring the safe and stable operation of the device. It is installed on the second cantilever 5, slides and engages within slide groove 22, and has anti-dislodgement stops at both ends.

[0059] Working Principle: When prestressing anchor cables in tunnel support is required, the appropriate movement method must first be selected based on the height of the anchor cables. For anchor cables at lower heights within the tunnel, a flatbed cart is recommended; for anchor cables at higher positions, a tunnel trolley is used. The core component of the device, the tensioning machine main unit 1, begins operation. The tensioning machine main unit 1 includes an oil tank 7, a controller 8, and a drive motor 9. The oil tank 7 contains an oil pump, which is driven by the drive motor 9. Two sets of oil delivery pipes 10 are connected to one side of the controller 8, and these oil delivery pipes 10 are sealed to the through-hole jack 2. When operation begins, the operator activates the oil pump through the control valve on the controller 8. The drive motor 9 drives the oil pump, delivering hydraulic oil from the oil tank 7 to the through-hole jack 2 via the oil delivery pipes 10, providing power to the through-hole jack 2. The pressure gauge on the controller 8 provides real-time feedback on the oil pressure, allowing the operator to accurately control the operation status. The rotating and hinged structures play a crucial role in adjusting the device angle to accommodate different anchor cable designs. The rotating structure consists of a fixed shaft 11, a rotating male ring 12, a rotating female groove 13, and a rotating base 14. The fixed shaft 11, welded to the bearing plate 3, is fitted with the rotating male ring 12 and the rotating base 14. The rotating female groove 13 within the rotating base 14 engages with the rotating male ring 12. When the angle of the first cantilever 4 needs adjustment, the first cantilever 4 and the rotating base 14 can rotate coaxially relative to the fixed shaft 11, thereby changing the orientation of the first cantilever 4 and allowing it to better align with the anchor cable. The hinged structure includes a clearance groove 15, a rotating disk 16, and a rotating shaft 17. A rotating disk 16 is located within the clearance groove 15 at one end of the first cantilever 4. The rotating disk 16 is hinged to the first cantilever 4 via the rotating shaft 17, which is in turn welded to the second cantilever 5. The second cantilever 5 can rotate hingedly relative to the first cantilever 4, changing the included angle between them, thereby adjusting the angle between the through-hole jack 2 and the ground. For anchor cables designed with different angles, this method allows for precise alignment of the through-hole jack 2. Once the appropriate angle is achieved, the hinged locking structure activates. Multiple locking holes 18 on the rotating shaft 17 engage with locking lugs 19 on the first cantilever 4 via pins, ensuring the angle does not shift during tensioning. The through-hole jack 2 is installed below the second cantilever 5 via the jack fixing kit 6. The jack fixing kit 6 has jack fixing holes 20 and a second cantilever through-hole 21. The through-hole jack 2 is fixed within the jack fixing hole 20, and the second cantilever 5 slides into the second cantilever through-hole 21. A groove 22 on one side of the second cantilever through-hole 21 cooperates with a limiting slider 23 on the second cantilever 5. Anti-disengagement stops at both ends of the limiting slider 23 ensure the safety and stability of the second cantilever 5 during sliding and also facilitate fine-tuning of the through-hole jack 2's position within a certain range. Once everything is ready, the anchor cable is secured to the through-hole jack 2 using anchor clamps and other means. At this point, under the action of hydraulic oil, the through-hole jack 2 begins to work, applying tension to the anchor cable and performing prestressing tensioning.After the tensioning operation is completed, the horizontal moving device is moved to the next anchor cable for tensioning. This eliminates the need for frequent lifting of the through-hole jack 2, greatly improving work efficiency and providing a strong guarantee for the smooth progress of the tunnel reinforcement project.

[0060] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prestressed steel strand tensioning device for tunnel reinforcement, comprising a tensioning machine host (1) and a through-jack (2), characterized in that: The tensioning machine host (1) is provided below with a bearing plate (3), one side of the bearing plate (3) is provided with a first cantilever (4), a rotating structure is arranged at the connecting position of the bearing plate (3) and the first cantilever (4), one end of the first cantilever (4) away from the bearing plate (3) is provided with a second cantilever (5), the first cantilever (4) and the second cantilever (5) are connected through a hinged structure, a jack fixing kit (6) is arranged on the second cantilever (5), and the through-jack (2) is fixedly installed below the second cantilever (5) through the jack fixing kit (6).

2. A device for tensioning a prestressed steel strand for tunnel reinforcement according to claim 1, characterized in that The tensioning machine host (1) comprises an oil tank (7), a controller (8) and a driving motor (9), the oil tank (7) is provided with an oil pump, the driving motor (9) for driving the oil pump to operate is arranged on the oil tank (7), one side of the driving motor (9) is provided with the controller (8), one side of the controller (8) is provided with two groups of oil conveying pipes (10), and the oil conveying pipes (10) are sealingly connected with the through-jack (2).

3. The prestressed steel strand tensioning device for tunnel reinforcement according to claim 1, characterized in that: The rotating structure comprises a fixed shaft (11), a rotating male ring (12), a rotating female groove (13) and a rotating base (14), the fixed shaft (11) is welded on the bearing plate (3), the rotating male ring (12) is arranged on the fixed shaft (11), the rotating base (14) is sleeved on the fixed shaft (11), the rotating female groove (13) corresponding to the rotating male ring (12) is formed in the rotating base (14), the rotating male ring (12) is clamped in the rotating female groove (13), and one side of the rotating base (14) away from the fixed shaft (11) is welded and connected with the first cantilever (4).

4. The prestressed steel strand tensioning device for tunnel reinforcement according to claim 3, characterized in that: The hinged structure comprises an avoiding groove (15), a rotating disc (16) and a rotating shaft (17), the avoiding groove (15) is formed at one end of the first cantilever (4) away from the bearing plate (3), the rotating disc (16) is arranged in the avoiding groove (15), the rotating disc (16) is hingedly connected with the first cantilever (4) through the rotating shaft (17), and one end of the rotating shaft (17) is welded and connected with the second cantilever (5).

5. A device for tensioning a prestressed steel strand for tunnel reinforcement according to claim 4, characterized in that: The hinged locking structure comprises a locking hole (18) and a locking lug (19), a plurality of locking holes (18) are formed on the rotating shaft (17), the locking lug (19) is arranged on the first cantilever (4), and the rotating shaft (17) is locked and fixed through the bolt and the locking lug (19).

6. A device for tensioning of a prestressed steel strand for tunnel reinforcement according to claim 1, characterized in that: The jack fixing kit (6) is provided with a jack fixing hole (20) and a second cantilever perforation (21), the through-jack (2) is fixedly installed in the jack fixing hole (20), the second cantilever (5) is slidingly clamped in the second cantilever perforation (21), a sliding groove (22) is formed at one side of the second cantilever perforation (21), a limiting sliding block (23) corresponding to the sliding groove (22) is arranged on the second cantilever (5), the limiting sliding block (23) is slidingly clamped in the sliding groove (22), and anti-disengagement stoppers are arranged at two ends of the limiting sliding block (23).

Images