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CN-224228273-U - Hollow slab prestressed tendon stretching device

CN224228273UCN 224228273 UCN224228273 UCN 224228273UCN-224228273-U

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 assembly component, a connecting block, a force application component and an elastic component, wherein a plurality of reinforcing steel bars are fixedly connected in the hollow slab body, one side of the hollow slab body is provided with hydraulic cylinders through the assembly component, two hydraulic cylinders are shared, the driving ends of the hydraulic cylinders are fixedly connected with the connecting block, one side close to the two connecting blocks is fixedly connected with a fixing plate, a plurality of through holes are formed in the fixing plate, one side of the top end of the fixing plate is fixedly connected with a motor, an accommodating cavity is formed in the top end of the fixing plate, and the force application component is rotationally connected to the inner top end of the accommodating cavity. The utility model avoids the direct action of excessive force on the surface of the steel bar, reduces the risk of damage to the steel bar, ensures the effective cross section area and structural safety of the steel bar, and improves the durability of the hollow slab.

Inventors

  • JI FENG
  • LIU JUNXIAO

Assignees

  • 江苏鑫泽新型建筑材料有限公司

Dates

Publication Date
20260512
Application Date
20250530

Claims (8)

  1. 1. The hollow slab prestressed tendon tensioning device is characterized by comprising a hollow slab body (1), wherein a plurality of steel tendons (2) are fixedly connected inside the hollow slab body (1); the assembly component is used for mounting the hydraulic cylinders (3) on one side of the hollow slab body (1) through the assembly component, and the two hydraulic cylinders (3) are shared; The hydraulic cylinder comprises a connecting block (6), wherein the driving ends of two hydraulic cylinders (3) are fixedly connected with the connecting block (6), one side close to the two connecting blocks (6) is fixedly connected with a fixed plate (7), a plurality of through holes (8) are formed in the fixed plate (7), a motor (9) is fixedly connected to one side of the top end of the fixed plate (7), and a containing cavity (10) is formed in the top end of the inside of the fixed plate (7); The top end of the inside of the accommodating cavity (10) is rotationally connected with a force application component, the bottom end of the force application component is fixedly connected with a plurality of upper clamps (16), and the number of the upper clamps (16) corresponds to the number of the through holes (8); The elastic component is internally mounted at the bottom end of the fixing plate (7), and a plurality of lower clamps (18) are fixedly connected to the top end of the elastic component.
  2. 2. The hollow slab prestressed tendon tensioning device according to claim 1, wherein the assembly component comprises two mounting plates (4), one side of each mounting plate (4) is fixedly connected with the other side of the hollow slab body (1), a plurality of bolts (5) are slidably connected to an inner array of each mounting plate (4), one outer side of each bolt (5) is in threaded connection with one inner side of one side, close to the corresponding mounting plate (4), of the hollow slab body (1), and the other side of each mounting plate (4) is fixedly connected with one side, far away from the corresponding connecting block (6), of the corresponding hydraulic cylinder (3).
  3. 3. A hollow slab tendon tensioning device as claimed in claim 1 in which the exterior of the tendon (2) extends through the interior of the through hole (8).
  4. 4. The hollow slab prestressed tendon tensioning device according to claim 1, wherein the force application component comprises a bidirectional threaded rod (11), the end part of the bidirectional threaded rod (11) is rotationally connected with the inner top end of the accommodating cavity (10), two threaded blocks (12) are externally threaded and connected with each other, a connecting rod (13) is rotationally connected with the inner bottom end of each threaded block (12), connecting blocks (14) are rotationally connected with the outer bottom end of each connecting rod (13), pressing plates (15) are fixedly connected with the bottom ends of the two connecting blocks (14), and the bottom ends of the pressing plates (15) are fixedly connected with the top ends of the plurality of upper clamps (16).
  5. 5. The hollow slab prestressed tendon tensioning device according to claim 4, wherein the outer portion of the threaded block (12) is in sliding connection with the top end of the inner wall of the accommodating chamber (10), the outer portion of the pressing plate (15) is in sliding connection with the inner wall of the accommodating chamber (10), and the driving end of the motor (9) is fixedly connected with one end of the bidirectional threaded rod (11).
  6. 6. The hollow slab prestressed tendon tensioning device according to claim 1, wherein the elastic component comprises a plurality of sliding rods (17), the top ends of the sliding rods (17) are fixedly connected with the bottom ends of the lower clamps (18), limiting plates (19) are fixedly connected with the bottom ends of the sliding rods (17), a plurality of circular holes (20) are formed in the bottom ends of the fixing plates (7), dampers (21) are fixedly connected with the inner bottom ends of the circular holes (20), and strong springs (22) are sleeved outside the dampers (21).
  7. 7. The hollow slab prestressed tendon tensioning device according to claim 6, wherein the bottom end of the limiting plate (19) is fixedly connected with the top end of the damper (21), and the outer part of the limiting plate (19) is slidably connected with the inner wall of the circular hole (20).
  8. 8. The hollow slab prestressed tendon tensioning device according to claim 6, wherein the top end of the strong spring (22) is fixedly connected with the bottom end of the limiting disc (19), and the bottom end of the strong spring (22) is fixedly connected with the bottom end of the inner wall of the circular hole (20).

Description

Hollow slab prestressed tendon stretching device Technical Field The utility model relates to the technical field of prestressed tendon tensioning, in particular to a hollow slab prestressed tendon tensioning device. Background The hollow slab is a plate-shaped building member with a hollow structure inside, and the hollow design inside not only effectively reduces the self weight, but also saves building materials, and is widely applied to the engineering of bridges, house buildings and the like. The prestressed tendon tensioning device is of great importance to the hollow slab, because the prestressed tendons can be tensioned by the device, and compressive stress can be pre-applied in the hollow slab. When the hollow plate bears load, the pre-existing compressive stress can offset part of the tensile stress, so that the cracking resistance and bearing capacity of the hollow plate are greatly improved, the service life of the hollow plate is prolonged, and the safety and stability of the building structure are ensured. When the tensioning of the prestressed tendons is carried out, one end of the steel bar is usually required to be connected with one end of the hollow slab, the other end of the steel bar is connected with a jack stretcher, then the jack stretcher is used, the steel bar is clamped and fixed by a clamping mechanism in the stretcher, when the steel bar is fixed, an indentation and a notch are reserved on the surface of the steel bar due to the fact that the rigidity strength is too strong, the effective sectional area of the steel bar is reduced, a stress concentration point is formed, the structural safety and durability are reduced, the steel bar slides in the stretching process due to too small force, the stretching length and the prestress value are out of control, and the reading of the stretcher is out of alignment, so that judgment on the tensioning process is affected. Therefore, it is necessary to provide a new hollow slab tendon tensioning device to solve the above technical problems. Disclosure of utility model In order to solve the technical problems, the utility model provides a hollow slab prestressed tendon tensioning device. The utility model provides a hollow slab prestressed tendon tensioning device which comprises a hollow slab body, an assembly component, a connecting block, a force application component and an elastic component, wherein a plurality of steel bars are fixedly connected inside the hollow slab body, one side of the hollow slab body is provided with hydraulic cylinders through the assembly component, the two hydraulic cylinders are shared, the driving ends of the two hydraulic cylinders are fixedly connected with the connecting block, the fixed plate is fixedly connected with one side close to the two connecting blocks, a plurality of through holes are formed inside the fixed plate, one side of the top end of the fixed plate is fixedly connected with a motor, the top end of the inside of the fixed plate is provided with a containing cavity, the top end of the inside of the containing cavity is rotationally connected with the force application component, the bottom end of the force application component is fixedly connected with a plurality of upper clamps, the number of the upper clamps corresponds to the number of the through holes, the elastic component is arranged inside the bottom end of the fixed plate, and the top end of the elastic component is fixedly connected with a plurality of lower clamps. Preferably, the assembly component comprises two mounting plates, one side of each mounting plate is fixedly connected with the other side of the hollow plate body, a plurality of bolts are slidably connected to the inner array of each mounting plate, one side of the outer part of each bolt is in threaded connection with the inner part of one side of the hollow plate body, which is close to the mounting plate, and the other side of each mounting plate is fixedly connected with one side, which is far away from the connecting block, of each hydraulic cylinder. Preferably, the outer portion of the reinforcing bar penetrates the inside of the through hole. Preferably, the force application assembly comprises a bidirectional threaded rod, the end part of the bidirectional threaded rod is rotationally connected with the inner top end of the accommodating cavity, two threaded blocks are connected with external threads of the bidirectional threaded rod, the inside of the bottom end of each threaded block is rotationally connected with a connecting rod, the outside of the bottom end of each connecting rod is rotationally connected with a connecting block, two bottom end fixedly connected with pressing plates of the connecting blocks, and the bottom ends of the pressing plates are fixedly connected with the top ends of the upper clamps. Preferably, the outside of screw thread piece is sliding connection with the inner wall top of holding the cavity, and the outside of clam