An attached integrated safety tensioning device for prestressed cantilever beam

Abstract

The application provides an attached integrated safety tensioning device for prestressed cantilever beam, relates to the tensioning technical field of cantilever beam and comprises a square frame, the top of the square frame is provided with a frame top plate, and a man access opening is arranged on the frame top plate; the bottom of the square frame is provided with a frame bottom plate; the inside of the square frame is provided with a plurality of hand-operated hoists, a tensioning jack is installed on the hand-operated hoist, the tensioning jack is connected with a hydraulic control device; a channel ladder is arranged below the man access opening on the square frame; fixed longitudinal rods extending outward are arranged on the two sides of the square frame, a plurality of fastening plates are arranged on the fixed longitudinal rods, and first screw threads are threadedly connected with the fastening plates. The application can efficiently and safely realize the erection of the beam end prestressed tensioning platform of the cantilever beam and improve the safety of construction.

Description

Technical Field

[0001] This invention relates to the field of cantilever beam tensioning technology, specifically an attached integrated safety tensioning device for prestressed cantilever beams. Background Technology

[0002] As the scale of public construction and infrastructure projects in China gradually increases, the use of prestressed concrete in large building cantilever beams and bridge cap beams is also increasing. However, existing tensioning operation platforms at the ends of cantilever beams mostly adopt ground-mounted scaffolding or hanging basket-type devices for construction. Among these, ground-mounted scaffolding platforms have a long construction cycle and low reuse efficiency, while hanging basket-type devices are simpler but pose greater safety risks. Overall, the construction measures are still in a relatively traditional stage, and the safety risks during the platform erection and application phases remain high. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention proposes an attached integrated safety tensioning device for prestressed cantilever beams, which can efficiently and safely realize the erection of the prestressed tensioning platform at the beam end of the cantilever beam, thereby improving the safety of construction.

[0004] This invention provides an integrated safety tensioning device for prestressed cantilever beams, comprising a cuboid frame, a top plate with an access passage on the top plate, a bottom plate, and several hand-operated hoists movable along the frame, each equipped with a tensioning jack connected to a hydraulic control device. A ladder is located below the access passage on the cuboid frame. Extended fixed longitudinal bars are provided on both sides of the cuboid frame, each with a fastening plate threaded with a first threaded screw, the inner end of which is fitted with a first fastening suction cup.

[0005] Preferably, the top four corners of the cuboid frame are provided with lifting lugs.

[0006] Preferably, the hand-operated hoist is fixed on a movable horizontal bar, both ends of which are slidably connected to adjacent movable vertical bars, and both ends of which are slidably connected to the frame of an adjacent cuboid frame.

[0007] Preferably, it also includes a U-shaped auxiliary fixing rod, both ends of which are threaded with a second threaded screw, and the inner end of the second threaded screw is provided with a second fastening suction cup; the U-shaped auxiliary fixing rod is located below the prestressed cantilever beam, and both ends of the U-shaped auxiliary fixing rod are connected to the cuboid frame by steel wire rope.

[0008] Preferably, an attachment support frame is provided on one side of the cuboid frame for mounting the hydraulic control device; the tensioning jack is connected to the hydraulic control device via an oil pipe.

[0009] Preferably, the outer ends of the two fixed longitudinal bars are connected by a connecting crossbar, and both ends of the connecting crossbar are connected to the bottom of the cuboid frame by stiffening diagonal braces. Preferably, the construction method includes the following steps: S1: Complete the construction and concrete curing of the prestressed cantilever beam, and conduct testing of the attached integrated safety tensioning device; S2: When the concrete strength of the prestressed cantilever beam reaches the design requirements, install and fix a U-shaped auxiliary fixing rod under the prestressed cantilever beam; S3: Use tower cranes or truck cranes to lift the cuboid frame; S4: After the cuboid frame is hoisted to the planned location, the installation position is confirmed and precisely adjusted; S5: After the cuboid frame is initially in place, steel wire ropes are used to connect the cuboid frame to the U-shaped auxiliary fixing rod; S6: Adjust the fixed longitudinal bar, rotate the first threaded screw, so that the first fastening suction cups on both sides can hold the beam side, and the prestressed cantilever beam is tightly hugged as a whole; S7: According to the reserved tensioning end position, the position of the hand-operated hoist is corrected to achieve the horizontal alignment of the lower tensioning jack; S8: Adjust the vertical position of the tensioning jack by using the positioning chain of the hand chain hoist to connect it to the tensioning position and the reserved steel strand; S9: Start the hydraulic control device to carry out prestressing tensioning construction; S10: After construction is completed, the tensioning device is dismantled and hoisted to the next construction area.

[0010] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention provides an attached integrated safety tensioning device for prestressed cantilever beams. Through the integrated hoisting and installation of the device, rapid prestressing tensioning of cantilever beams is achieved, solving problems such as construction platform erection and ensuring a safe construction environment. At the same time, the attached installation method improves the efficiency of the device, effectively reduces the erection cost of traditional ground-mounted platforms, reduces the safety risks of using hanging basket-type devices, and ultimately comprehensively improves the quality of prestressed tensioning construction and reduces the safety risks to construction personnel. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the attached integrated safety tensioning device for prestressed cantilever beams in an embodiment of the present invention.

[0012] Figure 2This is a partial structural schematic diagram of the attached integrated safety tensioning device for prestressed cantilever beams in an embodiment of the present invention.

[0013] In the diagram, 1. cuboid frame; 2. top plate of the frame; 3. access passageway; 4. ladder of the passageway; 5. bottom plate of the frame; 6. lifting lug; 7. hand-operated hoist; 8. moving crossbar; 9. moving longitudinal bar; 10. tension jack; 11. hydraulic control device; 12. oil pipe; 13. attachment support frame; 14. fixed longitudinal bar; 15. fastening plate; 16. first threaded screw; 17. first fastening suction cup; 18. connecting crossbar; 19. stiffening diagonal bar; 20. U-shaped auxiliary fixing rod; 21. second threaded screw; 22. second fastening suction cup; 23. prestressed cantilever beam; 24. steel wire rope. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments.

[0015] Example: Figure 1-2 The attached integrated safety tensioning device for prestressed cantilever beams shown includes a cuboid frame 1, which is made of square steel tubes welded together in the longitudinal and transverse directions to form and stabilize the overall structural frame.

[0016] Furthermore, a frame top plate 2 is provided on the top of the cuboid frame 1. The frame top plate 2 is made of thin sheet metal and connected to the cuboid frame 1 by rivets, covering the top and side spaces. An access passage 3 is provided at one corner of the frame top plate 2, and a ladder 4 is provided on the cuboid frame 1 below the access passage 3, allowing personnel to move up and down and enter the device for work.

[0017] Furthermore, a frame base plate 5 is provided at the bottom of the cuboid frame 1. The frame base plate 5 is made of thin steel plate and welded to the bottom surface of the cuboid frame 1. Multiple rectangular steel pipes are welded to the bottom of the frame base plate 5 and the cuboid frame 1 as load-bearing secondary beams. Lifting lugs 6 are provided at the four corners of the top of the cuboid frame 1.

[0018] Furthermore, two chain hoists 7 are installed inside the cuboid frame 1. Both chain hoists 7 are fixed on the movable crossbar 8. Both ends of the movable crossbar 8 are slidably connected to the adjacent movable vertical bar 9 through hooks. Both ends of the movable vertical bar 9 are slidably connected to the frame of the adjacent cuboid frame 1 through hooks, so that the two chain hoists 7 can move back and forth and left and right along the cuboid frame 1.

[0019] Furthermore, each chain hoist 7 is equipped with a tensioning jack 10 at its bottom. A positioning chain is wound around the chain hoist 7 and connected to the tensioning jack 10 at the bottom. The vertical height of the tensioning jack 10 can be adjusted by adjusting the length of the positioning chain. The tensioning jack 10 is connected to the hydraulic control device 11 through an oil pipe 12. An attachment bracket frame 13 is provided on one side of the cuboid frame 1. The attachment bracket frame 13 is made of square steel pipe welded together and is connected to the cuboid frame 1 by welding. It is used to house the hydraulic control device 11.

[0020] Furthermore, both sides of the cuboid frame 1 are provided with extended fixed longitudinal rods 14 at their center. Each fixed longitudinal rod 14 has two fastening plates 15 at its bottom, and each fastening plate 15 is threaded with a first threaded screw 16. The inner end of the first threaded screw 16 is provided with a first fastening suction cup 17, which is made of steel plate. By rotating and adjusting the length of the first threaded screw 16, the clamping degree between the first fastening suction cups 17 on both sides and the prestressed cantilever beam 23 is adjusted, achieving a stable connection of the device. The outer ends of the two fixed longitudinal rods 14 are connected by a connecting crossbar 18, and both ends of the connecting crossbar 18 are connected to the bottom of the cuboid frame 1 by stiffening diagonal braces 19.

[0021] Furthermore, it also includes a U-shaped auxiliary fixing rod 20, both ends of which are threaded with a second threaded screw 21. The inner end of the second threaded screw 21 is provided with a second fastening suction cup 22, which is made of steel plate. The U-shaped auxiliary fixing rod 20 is located below the prestressed cantilever beam 23, and both ends of the U-shaped auxiliary fixing rod 20 are connected to the cuboid frame 1 by steel wire rope 24.

[0022] The construction method for the attached integrated safety tensioning device for prestressed cantilever beams includes the following steps: S1: Complete the construction and concrete curing of prestressed cantilever beam 23, and conduct testing of the attached integrated safety tensioning device; S2: When the concrete strength of the prestressed cantilever beam 23 reaches the design requirements, a U-shaped auxiliary fixing rod 20 is installed below the prestressed cantilever beam 23 and fixed by the second threaded bolt 21; S3: Use a tower crane or truck crane to lift the cuboid frame 1, and fix the lifting rope clips to the lifting lugs 6 to lift the cuboid frame 1. S4: After the cuboid frame 1 is hoisted to the planned position, the installation position is confirmed and precisely adjusted; S5: After the cuboid frame 1 is initially in place, steel wire rope 24 is used to connect the cuboid frame 1 to the U-shaped auxiliary fixing rod 20. S6: Adjust the fixed longitudinal bar 14, rotate the first threaded screw 16, so that the first fastening suction cups 17 on both sides can hold the beam side, and the prestressed cantilever beam 23 is tightly hugged as a whole; S7: According to the reserved tensioning end position, the position of the hand chain hoist 7 is corrected to achieve the horizontal alignment of the lower tensioning jack 10; S8: Adjust the vertical position of the tensioning jack 10 by using the positioning chain of the hand chain hoist 7, so that it can be installed and connected with the tensioning position and the reserved steel strand; S9: Start the hydraulic control device 11 to carry out prestressing tensioning construction; S10: After construction is completed, the tensioning device is dismantled and hoisted to the next construction area.

[0023] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent solutions made using the contents of the present invention specification, whether directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of the present invention.

Claims

1. An attached integrated safety tensioning device for prestressed cantilever beams, characterized in that, The device includes a cuboid frame, with a top plate at the top and an access passage on the top plate; a bottom plate at the bottom; several hand-operated hoists inside the cuboid frame, which can move forward, backward, left, and right along the frame; tension jacks are mounted on the hoists and connected to a hydraulic control device; a ladder is located below the access passage on the cuboid frame; and extended fixed longitudinal bars are provided on both sides of the cuboid frame, each fixed longitudinal bar having several fastening plates. A first threaded screw is threaded onto each fastening plate, and a first fastening suction cup is located at the inner end of the first threaded screw. The hand chain hoist is fixed on the movable horizontal bar, both ends of which are slidably connected to the adjacent movable vertical bar, and both ends of which are slidably connected to the frame of the adjacent cuboid frame. It also includes a U-shaped auxiliary fixing rod, both ends of which are threaded with a second threaded screw, and the inner end of the second threaded screw is provided with a second fastening suction cup; the U-shaped auxiliary fixing rod is set below the prestressed cantilever beam, and both ends of the U-shaped auxiliary fixing rod are connected to the cuboid frame by steel wire rope; An attachment support frame is provided on one side of the cuboid frame for mounting the hydraulic control device; the tensioning jack is connected to the hydraulic control device via an oil pipe.

2. The attached integrated safety tensioning device for prestressed cantilever beams as described in claim 1, characterized in that, The cuboid frame is equipped with lifting lugs at all four top corners.

3. The attached integrated safety tensioning device for prestressed cantilever beams as described in claim 1 or 2, characterized in that, The outer ends of the two fixed longitudinal bars are connected by a connecting crossbar, and both ends of the connecting crossbar are connected to the bottom of the cuboid frame by stiffening diagonal bars.

4. The attached integrated safety tensioning device for prestressed cantilever beams as described in claim 1 or 2, characterized in that, Its construction method includes the following steps: S1: Complete the construction and concrete curing of the prestressed cantilever beam, and conduct testing of the attached integrated safety tensioning device; S2: When the concrete strength of the prestressed cantilever beam reaches the design requirements, install and fix a U-shaped auxiliary fixing rod under the prestressed cantilever beam; S3: Use tower cranes or truck cranes to lift the cuboid frame; S4: After the cuboid frame is hoisted to the planned location, the installation position is confirmed and precisely adjusted; S5: After the cuboid frame is initially in place, steel wire ropes are used to connect the cuboid frame to the U-shaped auxiliary fixing rod; S6: Adjust the fixed longitudinal bar, rotate the first threaded screw, so that the first fastening suction cups on both sides can hold the beam side, and the prestressed cantilever beam is tightly hugged as a whole; S7: According to the reserved tensioning end position, the position of the hand-operated hoist is corrected to achieve the horizontal alignment of the lower tensioning jack; S8: Adjust the vertical position of the tensioning jack by using the positioning chain of the hand chain hoist to connect it to the tensioning position and the reserved steel strand; S9: Start the hydraulic control device to carry out prestressing tensioning construction; S10: After construction is completed, the tensioning device is dismantled and hoisted to the next construction area.

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