Hollow slab prestressed tendon tensioning device

Abstract

The utility model relates to the technical field of prestressed tendon tensioning, in particular to a hollow slab prestressed tendon tensioning device. The hollow slab prestressed tendon tensioning device comprises a hollow slab body, an assembling assembly, a connecting block, a force applying assembly and an elastic assembly, a plurality of steel bars are fixedly connected to the interior of the hollow slab body, hydraulic cylinders are installed on one side of the hollow slab body through the assembling assembly, the number of the hydraulic cylinders is two, the driving ends of the two hydraulic cylinders are fixedly connected with the connecting block, and the connecting block is fixedly connected with the elastic assembly. A fixing plate is fixedly connected to the sides, close to each other, of the two connecting blocks, a plurality of through holes are formed in the fixing plate, a motor is fixedly connected to one side of the top end of the fixing plate, a containing cavity is formed in the top end of the interior of the fixing plate, and a force application assembly is rotationally connected to the top end of the interior of the containing cavity. According to the hollow slab, overlarge force is prevented from directly acting on the surfaces of the steel bars, the risk of steel bar damage is reduced, the effective sectional area and the structural safety of the steel bars are guaranteed, and the durability of the hollow slab is improved.

Description

Technical Field

[0001] This utility model relates to the field of prestressed tendon tensioning technology, and in particular to a prestressed tendon tensioning device for hollow slabs. Background Technology

[0002] Hollow core slabs are plate-shaped building components with a hollow internal structure. Their hollow design not only effectively reduces their weight but also saves building materials, making them widely used in bridge and building construction. The prestressing tendon tensioning device is crucial for hollow core slabs because it applies pre-existing compressive stress to the prestressing tendons. When the hollow core slab is under load, this pre-existing compressive stress can offset some of the tensile stress, significantly improving the slab's crack resistance and load-bearing capacity, extending its service life, and ensuring the safety and stability of the building structure.

[0003] In most hollow slabs, the prestressing tendon tensioning typically requires connecting one end of the reinforcing bar to one end of the hollow slab and the other end to a jack tensioning machine. The jack tensioning machine then uses its internal clamping mechanism to clamp and fix the reinforcing bar. However, excessive force during fixing can leave indentations and marks on the reinforcing bar surface, reducing its effective cross-sectional area, creating stress concentration points, and lowering structural safety and durability. Conversely, insufficient force can cause the reinforcing bar to slip during tensioning, leading to uncontrolled stretching length and prestress values, and inaccurate machine readings, affecting the judgment of the tensioning process.

[0004] Therefore, it is necessary to provide a new prestressing tendon tensioning device for hollow slabs to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a prestressing tendon tensioning device for hollow slabs.

[0006] The hollow slab prestressing tendon tensioning device provided by this utility model includes: a hollow slab body, an assembly assembly, a connecting block, a force application assembly, and an elastic force assembly. Multiple reinforcing bars are fixedly connected inside the hollow slab body. Two hydraulic cylinders are installed on one side of the hollow slab body via the assembly assembly. A connecting block is fixedly connected to the drive end of each of the two hydraulic cylinders. A fixing plate is fixedly connected to the adjacent side of each of the two connecting blocks. Multiple through holes are opened inside the fixing plate. A motor is fixedly connected to one top side of the fixing plate. A receiving chamber is opened inside the top of the fixing plate. A force application assembly is rotatably connected to the top of the receiving chamber. Multiple upper clamps are fixedly connected to the bottom end of the force application assembly, the number of upper clamps corresponding to the number of through holes. An elastic force assembly is installed inside the bottom end of the fixing plate, and multiple lower clamps are fixedly connected to the top end of the elastic force assembly.

[0007] Preferably, the assembly includes two mounting plates. One side of the mounting plate is fixedly connected to the other side of the hollow plate body. Multiple bolts are slidably connected in an array inside the mounting plate. The outer side of each bolt is threadedly connected to the side of the hollow plate body closest to the mounting plate. The other side of the mounting plate is fixedly connected to the side of the hydraulic cylinder away from the connecting block.

[0008] Preferably, the outside of the reinforcing bar penetrates the inside of the through hole.

[0009] Preferably, the force-applying component includes a bidirectional threaded rod, the end of which is rotatably connected to the inner top of the receiving chamber. The external thread of the bidirectional threaded rod is connected to two threaded blocks. The bottom end of each threaded block is rotatably connected to a connecting rod, and the bottom end of the connecting rod is rotatably connected to a connecting block. The bottom ends of the two connecting blocks are fixedly connected to pressure plates, and the bottom ends of the pressure plates are fixedly connected to the tops of the plurality of upper clamps.

[0010] Preferably, the outer side of the threaded block is slidably connected to the top of the inner wall of the receiving chamber, the outer side of the pressure plate is slidably connected to the inner wall of the receiving chamber, and the drive end of the motor is fixedly connected to one end of the bidirectional threaded rod.

[0011] Preferably, the elastic component includes multiple sliding rods, the top end of the sliding rods is fixedly connected to the bottom end of the lower clamp, the bottom end of the sliding rods is fixedly connected to a limit plate, the bottom end of the fixed plate has multiple circular holes, the bottom end of the circular holes is fixedly connected to a damper, and a strong spring is sleeved on the outside of the damper.

[0012] Preferably, the bottom end of the limiting plate is fixedly connected to the top end of the damper, and the outer side of the limiting plate is slidably connected to the inner wall of the circular hole.

[0013] Preferably, the top end of the strong spring is fixedly connected to the bottom end of the limiting plate, and the bottom end of the strong spring is fixedly connected to the bottom end of the inner wall of the circular hole.

[0014] Compared with related technologies, the hollow slab prestressing tendon tensioning device provided by this utility model has the following beneficial effects:

[0015] This invention utilizes the combination of a force-applying component and an elastic component, along with the elasticity of a powerful spring and the buffering effect of a damper, to stably clamp the reinforcing bars. This avoids excessive force acting directly on the surface of the reinforcing bars, reduces the risk of damage, ensures the effective cross-sectional area of ​​the reinforcing bars and structural safety, and improves the durability of the hollow slab.

[0016] This invention uses a motor to precisely control the rotation of a bidirectional threaded rod, thereby accurately controlling the lifting and lowering of the upper clamp. Combined with an elastic component, it stably clamps the reinforcing bar, accurately controlling the tensioning process of the reinforcing bar, ensuring that the tensile length and prestress value meet the design requirements, improving tensioning accuracy, and guaranteeing the accuracy of prestress application. Attached Figure Description

[0017] Figure 1 A schematic diagram of the prestressing tendon tensioning device for hollow slabs provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shows the structure of the fixing plate.

[0019] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0020] Figure 4 for Figure 2 Enlarged view of point B in the image.

[0021] The following are the labels in the diagram: 1. Hollow core plate body; 2. Reinforcing bar; 3. Hydraulic cylinder; 4. Mounting plate; 5. Bolt; 6. Connecting block; 7. Fixing plate; 8. Through hole; 9. Motor; 10. Receiving chamber; 11. Bidirectional threaded rod; 12. Threaded block; 13. Connecting rod; 14. Connecting block; 15. Pressure plate; 16. Upper clamp; 17. Sliding rod; 18. Lower clamp; 19. Limiting plate; 20. Circular hole; 21. Damper; 22. Strong spring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0024] Please see Figures 1 to 4 The hollow slab prestressed tendon tensioning device includes: a hollow slab body 1, which serves as the basic load-bearing component of the entire device. It is made of high-strength concrete and has a carefully designed hollow structure inside, which effectively reduces its weight while ensuring sufficient load-bearing capacity. It is widely applicable to various projects such as bridges and building construction. Multiple steel bars 2 are fixedly connected inside the hollow slab body 1. These steel bars 2 are all high-strength prestressed steel bars that meet national standards and have undergone special anti-rust treatment to ensure stable performance during long-term use. The steel bars 2 are fixed according to strict design spacing and layout, providing key mechanical support for the hollow slab.

[0025] The assembly assembly includes two hydraulic cylinders 3 mounted on one side of the hollow plate body 1. These two hydraulic cylinders 3 have stable thrust output and precise stroke control capabilities. The assembly assembly includes two mounting plates 4. One side of the mounting plate 4 is fixedly connected to the other side of the hollow plate body 1. The connection is achieved by aligning the positioning holes pre-drilled on the mounting plate 4 with the corresponding pre-embedded bolt holes on the hollow plate body 1. Multiple bolts 5 are slidably connected in an array inside the mounting plate 4. The outer side of these bolts 5 is threadedly connected to the side of the hollow plate body 1 closest to the mounting plate 4. The bolts are tightened to the designed torque using a torque wrench to ensure the reliability of the connection. The other side of the mounting plate 4 is fixedly connected to the side of the hydraulic cylinder 3 away from the connecting block 6.

[0026] Connecting block 6 is fixedly connected to the drive end of two hydraulic cylinders 3. Fixing plate 7 is fixedly connected to the adjacent side of the two connecting blocks 6. Multiple through holes 8 are opened inside the fixing plate 7. The outside of the steel bar 2 passes through the inside of the through holes 8 to allow the steel bar 2 to pass smoothly. A motor 9 is fixedly connected to one side of the top of the fixing plate 7. The motor 9 is a high-precision servo motor with precise speed control and torque output capability, which can meet the working requirements under different working conditions. A receiving chamber 10 is opened at the top of the inside of the fixing plate 7.

[0027] The force-applying component is rotatably connected to the top of the receiving chamber 10. Multiple upper clamps 16 are fixedly connected to the bottom of the force-applying component, the number of which corresponds to the number of through holes 8. The force-applying component includes a bidirectional threaded rod 11. The drive end of the motor 9 is fixedly connected to one end of the bidirectional threaded rod 11 to ensure accurate power transmission. The end of the bidirectional threaded rod 11 is rotatably connected to the top of the receiving chamber 10 to reduce frictional resistance during rotation. Two threaded blocks 1 are externally threaded onto the bidirectional threaded rod 11. 2. The outer side of the threaded block 12 is slidably connected to the top of the inner wall of the receiving chamber 10 to achieve smooth linear sliding. The bottom end of the threaded block 12 is rotatably connected to the connecting rod 13. Both ends of the connecting rod 13 are rotatably connected to the threaded block 12 and the connecting block 14 through joint bearings to ensure that the angle can be flexibly changed during the movement. The bottom ends of the two connecting blocks 14 are fixedly connected to the pressure plate 15. The outer side of the pressure plate 15 is slidably connected to the inner wall of the receiving chamber 10. The bottom end of the pressure plate 15 is fixedly connected to the top of the multiple upper clamps 16.

[0028] The elastic component is installed inside the bottom end of the fixed plate 7. Multiple lower clamps 18 are fixedly connected to the top end of the elastic component. The structure of the lower clamps 18 matches that of the upper clamp 16. The elastic component includes multiple sliding rods 17. The top end of each sliding rod 17 is fixedly connected to the bottom end of the lower clamp 18. A limiting plate 19 is fixedly connected to the bottom end of each sliding rod 17. The limiting plate 19 has a circular disc structure with a diameter larger than that of the sliding rod 17, serving a limiting function. Multiple circular holes 20 are opened inside the bottom end of the fixed plate 7. The size of the circular holes 20 is adapted to the sliding rods 17 and the limiting plate 19. The outer surface of the limiting plate 19... The part is slidably connected to the inner wall of the circular hole 20. A damper 21 is fixedly connected to the bottom of the inner part of the circular hole 20. The damper 21 is a hydraulic damper, which can provide stable damping force, effectively reduce the movement speed of the lower clamp 18, and play a buffering role. The bottom end of the limiting plate 19 is fixedly connected to the top end of the damper 21. A strong spring 22 is sleeved on the outside of the damper 21. The top end of the strong spring 22 is fixedly connected to the bottom end of the limiting plate 19, and the bottom end of the strong spring 22 is fixedly connected to the bottom end of the inner wall of the circular hole 20. The elastic force of the strong spring 22 realizes the elastic support of the lower clamp 18.

[0029] The working principle of the hollow slab prestressing tendon tensioning device provided by this utility model is as follows:

[0030] First, the hydraulic cylinder 3 is installed on one side of the hollow slab body 1 by assembling the components. Specifically, two mounting plates 4 are fixedly connected to one side of the hollow slab body 1. Multiple bolts 5 are slidably connected inside the mounting plates 4 and threadedly connected to the inside of the hollow slab body 1 near the mounting plates 4, thereby stabilizing the mounting plates 4. Then, the side of the hydraulic cylinder 3 away from the connecting block 6 is fixedly connected to the other side of the mounting plates 4, completing the installation of the hydraulic cylinder 3. Multiple steel bars 2 that need to be prestressed are passed through multiple through holes 8 opened inside the fixing plate 7 from inside the hollow slab body 1, so that the steel bars 2 are in the initial position to be tensioned.

[0031] Start the motor 9, which drives the bidirectional threaded rod 11 to rotate. Since the bidirectional threaded rod 11 has two threaded blocks 12 connected to its external threads, and the external threads of the threaded blocks 12 are slidably connected to the top of the inner wall of the receiving chamber 10, the two threaded blocks 12 will move relative to each other or towards each other under the action of their threads when the bidirectional threaded rod 11 rotates.

[0032] As the threaded block 12 moves, the connecting rod 13, which is rotatably connected to its bottom end, will drive the connecting block 14 to move. Because the bottom end of the connecting rod 13 is rotatably connected to the connecting block 14, and the bottom ends of the two connecting blocks 14 are fixedly connected to the pressure plate 15, and the outside of the pressure plate 15 is slidably connected to the inner wall of the receiving chamber 10, the pressure plate 15 will rise or fall according to the direction of movement of the threaded block 12 under the drive of the connecting rod 13 and the connecting block 14. When it is necessary to clamp the reinforcing bar 2, the motor 9 rotates to make the threaded blocks 12 move towards each other, driving the pressure plate 15 to fall. The multiple upper clamps 16 fixedly connected to the bottom end of the pressure plate 15 also fall down and gradually approach the reinforcing bar 2.

[0033] While the above operations are being performed, as the upper clamp 16 gradually presses down on the rebar 2, the lower clamp 18 will slide downward in the circular hole 20 through the sliding rod 17 under the pressure of the rebar 2, compressing the strong spring 22. The spring force of the strong spring 22 is used to stably clamp the rebar 2. At the same time, the damper 21 plays a buffering and stabilizing role, preventing the lower clamp 18 from shaking excessively.

[0034] After the upper clamp 16 and lower clamp 18 firmly clamp the reinforcing bar 2, the two hydraulic cylinders 3 are activated. The driving end of the hydraulic cylinder 3 is fixedly connected to the connecting block 6, and the two connecting blocks 6 are fixedly connected to the fixing plate 7 on the side close to each other. The hydraulic cylinder 3 pushes the connecting block 6 and the fixing plate 7 to move, thereby applying tension to the clamped reinforcing bar 2 and realizing the prestressing tensioning operation of the reinforcing bar 2. After the prestressing tensioning is completed, the hydraulic cylinder 3 is first controlled to retract, so that the tension of the reinforcing bar 2 is released. Then the motor 9 rotates in the opposite direction, so that the bidirectional threaded rod 11 drives the threaded block 12 to move relative to each other. The upper clamp 16 rises, and at the same time the lower clamp 18 rises under the restoring force of the strong spring 22, releasing the clamping of the reinforcing bar 2.

[0035] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A prestressing tendon tensioning device for hollow slabs, characterized in that, include: Hollow core slab body (1), with multiple steel bars (2) fixedly connected inside the hollow core slab body (1); The assembly assembly has a hydraulic cylinder (3) mounted on one side of the hollow plate body (1), and there are two hydraulic cylinders (3). Connecting block (6), the driving ends of the two hydraulic cylinders (3) are fixedly connected to the connecting block (6), the two connecting blocks (6) are fixedly connected to the adjacent side of the fixed plate (7), the fixed plate (7) has multiple through holes (8) inside, the top side of the fixed plate (7) is fixedly connected to the motor (9), and the top of the fixed plate (7) has a receiving chamber (10). The force application component is rotatably connected to the top of the cavity (10), and multiple upper clamps (16) are fixedly connected to the bottom of the force application component. The number of upper clamps (16) corresponds to the number of through holes (8). The elastic component is installed inside the bottom end of the fixed plate (7), and multiple lower clamps (18) are fixedly connected to the top end of the elastic component.

2. The hollow slab prestressing tendon tensioning device according to claim 1, characterized in that, The assembly includes two mounting plates (4). One side of the mounting plate (4) is fixedly connected to the other side of the hollow plate body (1). Multiple bolts (5) are slidably connected in an array inside the mounting plate (4). The outer side of the bolts (5) is threadedly connected to the side of the hollow plate body (1) near the mounting plate (4). The other side of the mounting plate (4) is fixedly connected to the side of the hydraulic cylinder (3) away from the connecting block (6).

3. The hollow slab prestressing tendon tensioning device according to claim 1, characterized in that, The outside of the reinforcing bar (2) penetrates the inside of the through hole (8).

4. The hollow slab prestressing tendon tensioning device according to claim 1, characterized in that, The force-applying component includes a bidirectional threaded rod (11), the end of which is rotatably connected to the top of the inner cavity (10). The external thread of the bidirectional threaded rod (11) is connected to two threaded blocks (12). The bottom end of the threaded block (12) is rotatably connected to a connecting rod (13), and the bottom end of the connecting rod (13) is rotatably connected to a connecting block (14). The bottom ends of the two connecting blocks (14) are fixedly connected to a pressure plate (15), and the bottom end of the pressure plate (15) is fixedly connected to the top of the multiple upper clamps (16).

5. The hollow slab prestressing tendon tensioning device according to claim 4, characterized in that, The outer side of the threaded block (12) is slidably connected to the top of the inner wall of the receiving chamber (10), the outer side of the pressure plate (15) is slidably connected to the inner wall of the receiving chamber (10), and the driving end of the motor (9) is fixedly connected to one end of the bidirectional threaded rod (11).

6. The hollow slab prestressing tendon tensioning device according to claim 1, characterized in that, The elastic component includes multiple sliding rods (17). The top end of the sliding rod (17) is fixedly connected to the bottom end of the lower clamp (18). The bottom end of the sliding rod (17) is fixedly connected to a limit plate (19). Multiple circular holes (20) are opened inside the bottom end of the fixed plate (7). A damper (21) is fixedly connected inside the bottom end of the circular hole (20). A strong spring (22) is sleeved on the outside of the damper (21).

7. The hollow slab prestressing tendon tensioning device according to claim 6, characterized in that, The bottom end of the limiting plate (19) is fixedly connected to the top end of the damper (21), and the outside of the limiting plate (19) is slidably connected to the inner wall of the circular hole (20).

8. The hollow slab prestressing tendon tensioning device according to claim 6, characterized in that, The top end of the strong spring (22) is fixedly connected to the bottom end of the limiting plate (19), and the bottom end of the strong spring (22) is fixedly connected to the bottom end of the inner wall of the circular hole (20).

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