A construction method for a large-diameter prestressed steel cable tensioning and tightening device with a diameter greater than 100 mm

Abstract

The present invention provides a prestressed steel cable tensioning and tightening device and a construction method, which relates to the technical field of steel structure building construction, including a fixed bracket, a high-strength rope and a lifting device; the fixed bracket is fixed to the middle of the adjusting screw; two high-strength ropes are provided, which are respectively wound around the two ends of the adjusting screw; wherein one end of each high-strength rope is fixed to the fixed bracket, and the other end is connected to the lifting device. The present invention uses the lifting device to pull the two wound high-strength ropes, and the high-strength ropes generate torque on the adjusting screw, so that the adjusting screw rotates, and the cables at both ends move toward the middle, which plays the role of tightening the steel cable. Therefore, the prestressed tensioning and tightening of the steel cable can be easily achieved, and it can be suitable for cables with large pre-tightening force of large diameter cables. The tightening force of the device of the present invention is easy to control, and can replace the traditional chain wrench tightening construction, thereby avoiding the situation where the wrench is bent and the chain collapses and cannot be used, and has high safety.

Description

Technical Field

[0001] The invention relates to a construction method for a large-diameter prestressed steel cable tensioning and tightening device with a diameter greater than 100 mm, belonging to the technical field of steel structure building construction. Background Art

[0002] At present, more and more large-scale spatial structures use prestressed cables. The use of prestressed technology in structures can not only increase structural rigidity, reduce structural weight, and reduce the amount of steel used, but also create a variety of new structural systems, especially in large-span steel structures. In order to establish prestress in the cable, it is inevitable to tension the cable and then tighten the adjusting screw.

[0003] The main methods for tensioning and tightening prestressed cables currently used in engineering are as follows: first, apply tension to the tension cable head through a hydraulic jack to put the cable adjustment section thread in a low stress state, then wrap the adjusting screw with the chain of the chain wrench, and tighten the adjusting screw by applying torque tightening force through the wrench to complete the tensioning of the cable. It is worth noting that for small-diameter cables, this cable tensioning method is more suitable; but for large-diameter cables (diameter greater than 100mm), due to the large pre-tensioning cable force, the tightening force is difficult to control, and the use of chain wrenches for tightening construction often results in the wrench being bent and unusable, and even the chain breaking and popping out, accidentally injuring the operator, posing a major safety hazard.

[0004] Based on this, this application is made. Summary of the invention

[0005] In order to solve the drawback of using chain wrenches to tighten large-diameter cables in the current construction, the present invention provides a construction method for a tensioning and tightening device for large-diameter prestressed steel cables with a diameter greater than 100 mm. The device has a simple structure and is convenient to construct. It is also easy to disassemble and reuse and has high safety, thus avoiding material waste and construction risks caused by using chain wrenches when tensioning and tightening prestressed cables.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A prestressed steel cable tensioning and tightening device, comprising a fixed bracket, a high-strength rope and a lifting device; the fixed bracket is fixed to the middle part of the steel cable adjusting screw; two high-strength ropes are provided, which are respectively wound around the two ends of the adjusting screw; one end of each of the high-strength ropes is fixed to the fixed bracket, and the other end is connected to the lifting device.

[0008] Preferably, the two high-strength ropes are respectively wound around the adjusting screw in opposite directions; two ends of the two high-strength ropes are respectively tensioned by two lifting devices, and the installation positions are respectively located on both sides of the steel cable adjusting screw.

[0009] Preferably, the fixed bracket adopts a detachable and adjustable structure, including two clamping plates respectively installed on the upper and lower sides of the adjusting screw, and two fixing screws respectively installed on the two ends of the clamping plates and connecting the upper and lower clamping plates; both ends of the clamping plates are provided with multiple bolt holes spaced apart along the length direction of the clamping plates, and the fixing screw can be selectively installed in any one of the above-mentioned bolt holes.

[0010] Preferably, the lifting device adopts a hand chain hoist, and one end of the hand chain hoist is connected to a high-strength rope, and the other end is fixed to a surrounding fixed structure.

[0011] Preferably, the high-strength rope is a steel wire rope.

[0012] Preferably, the two high-strength ropes are respectively installed and connected diagonally on the fixed brackets.

[0013] Preferably, one end of the high-strength rope is provided with a shackle, which is detachably fixedly connected to the bolt hole on the clamping plate through the shackle.

[0014] A construction method for a large-diameter prestressed steel cable tensioning and tightening device with a diameter greater than 100 mm, comprising the following steps:

[0015] (1) Select the appropriate clamping plate and matching fixing screw according to the specifications of the adjusting screw of the steel cable;

[0016] (2) Place a clamping plate parallel to the upper and lower adjusting screws of the steel cable, and temporarily clamp and fix the two ends of the clamping plate with fixing screws;

[0017] (3) Connect the two high-strength ropes to the bolt holes at the ends of the clamping plate through the shackles, and wind the two high-strength ropes around the adjusting screws of the steel cable in opposite directions;

[0018] (4) One end of the two sets of hand chain hoists is connected to the end of the wound wire rope, and the other end is connected to the surrounding fixed structure, and the hand chain hoists are pre-tightened;

[0019] (5) When the steel cable is tensioned to the point where the cable adjusting screw can be tightened, the cable adjusting screw is tightened by tensioning the hand chain hoist;

[0020] (6) After tightening once, loosen the connection between the hand chain hoist and the wire rope, rewind the wire rope, and fix the hand chain hoist, waiting for the next level of tensioning and tightening of the cable;

[0021] (7) Repeat the above steps throughout the entire tensioning process, and finally complete the prestressing and tightening of the cable adjustment screw.

[0022] Principle of the present invention: The present invention uses a lifting device to pull two wound high-strength ropes. The high-strength ropes generate torque on the adjusting screw to rotate the adjusting screw. Since the threads at both ends of the adjusting screw are opposite, the cables at both ends can be moved toward the middle, which plays a role in tightening the screw while tensioning the steel cable. With the help of the lifting device and the wound high-strength rope, the prestressed tensioning and tightening of the steel cable can be easily achieved. It can be suitable for large-diameter cables (diameter greater than 100mm) with large pre-tightening force. The tightening force of the device of the present invention is easy to control, and can replace the traditional chain wrench tightening construction, thereby avoiding the wrench being bent and the chain being broken and unusable, and has high safety.

[0023] The present invention can achieve the following technical effects:

[0024] (1) The prestressed cable tightening device of the present invention has a concise form and a simple structure;

[0025] (2) The material of the prestressed cable tightening device of the present invention can be reused;

[0026] (3) The prestressed cable tightening method of the present invention is convenient to construct and simple to disassemble;

[0027] (4) The prestressed cable tightening method of the present invention has a large tightening torque and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an axonometric view of the prestressed steel cable tensioning and tightening device during construction of this embodiment;

[0029] Figure 2 This is a cross-sectional view of the cable connection of the prestressed steel cable tensioning and tightening device of this embodiment.

[0030] Marking instructions: clamping plate 1, bolt hole 11, fixing screw 2, hand hoist 3, wire rope 4, shackle 41, steel cable 5, adjusting screw 51, tightening pier 52, surrounding fixed structure 6. DETAILED DESCRIPTION

[0031] In order to make the technical means of the present invention and the technical effects that can be achieved by it more clearly and completely disclosed, the following embodiments are provided and described in detail as follows in conjunction with the accompanying drawings:

[0032] like Figure 1 to Figure 2As shown, a prestressed steel cable tensioning and tightening device of this embodiment, the steel cable to be tensioned and tightened includes an adjusting screw and a tightening pier; the tensioning and tightening device includes a fixed bracket, a high-strength rope and a lifting device; the fixed bracket is fixed to the middle of the adjusting screw; two high-strength ropes are provided, which are respectively wound around the two ends of the adjusting screw; one end of each high-strength rope is fixed to the fixed bracket, and the other end is connected to the lifting device. Through the lifting device, the two wound high-strength ropes are pulled, and the high-strength ropes generate torque on the adjusting screw, so that the adjusting screw rotates. Since the threads at both ends of the adjusting screw are opposite, the cables at both ends can be moved toward the middle, which plays the role of tightening the steel cable. By using the lifting device and the wound high-strength rope, the prestressed tensioning and tightening of the steel cable can be easily achieved, which can be suitable for cables with large diameters (diameter greater than 100mm) and large pre-tightening forces. The tightening force of the device of the present invention is easy to control, and can replace the traditional chain wrench tightening construction, thereby avoiding the wrench being bent and the chain being broken and unable to be used, and has high safety.

[0033] In this embodiment, two high-strength ropes are respectively wound around the adjusting screw in opposite directions; and tension is applied by two lifting devices respectively, and the installation positions are respectively located on both sides of the adjusting screw. The number of winding turns can be determined according to the tension and the thread pitch of the cable screw. By lifting and pulling the lifting devices on both sides at the same time, the force on the adjusting screw is more balanced, and the tightening work is completed more efficiently.

[0034] Preferably, in this embodiment, the fixed bracket adopts a detachable and adjustable structure, including two clamping plates respectively installed on the upper and lower sides of the adjusting screw, and two fixing screws respectively installed on the two ends of the clamping plates and connecting the upper and lower clamping plates; both ends of the clamping plates are provided with multiple bolt holes spaced along the length direction of the clamping plates, and the fixing screw can be selectively installed in any of the above-mentioned bolt holes, and the installation bolt hole is selected according to the specification (diameter) of the adjusting screw. Therefore, this tightening device is suitable for cable adjusting screws of various specifications, and because it is detachable, it can be reused.

[0035] In this embodiment, the lifting device adopts a hand chain hoist, and one end of the hand chain hoist is connected to the high-strength rope, and the other end is fixed to the surrounding fixed structure, and the operating surfaces of the two sets of hand chain hoists do not interfere with each other. Through the hand chain hoist, manual operation can be more controllable and labor-saving.

[0036] In this embodiment, the high-strength rope is preferably a steel wire rope, which has high strength and can carry greater tension and torque.

[0037] Preferably, in this embodiment, two high-strength ropes are respectively installed and connected diagonally on the fixed bracket to further ensure the force balance of the adjusting screw.

[0038] Preferably, in this embodiment, the clamping plate in the fixed bracket is engaged with the tightening pier of the cable adjusting screw, that is, the two clamping plates are fixed at the tightening pier in the middle of the adjusting screw and are arranged in parallel on both sides of the adjusting screw, which can ensure the strength of the fixed bracket. At the same time, when the fixed bracket rotates, the adjusting screw rotates synchronously.

[0039] Preferably, in this embodiment, a shackle is provided at one end of the high-strength rope, and the shackle is detachably fixedly connected to the bolt hole on the clamping plate.

[0040] The construction method of the large-diameter prestressed steel cable tensioning and tightening device of this embodiment with a diameter greater than 100 mm comprises the following steps:

[0041] (1) Select the appropriate clamping plate and matching fixing screw according to the specifications of the adjusting screw of the steel cable;

[0042] (2) Place a clamping plate parallel to the upper and lower adjusting screws of the steel cable, and temporarily clamp and fix the two ends of the clamping plate with fixing screws;

[0043] (3) Connect the two high-strength ropes to the bolt holes at the ends of the clamping plate through the shackles, and wind the two high-strength ropes around the adjusting screw of the steel cable in opposite directions;

[0044] (4) One end of the two sets of hand chain hoists is connected to the end of the wound wire rope, and the other end is connected to the surrounding fixed structure, and the hand chain hoists are pre-tightened;

[0045] (5) When the steel cable is tensioned to the point where the cable adjusting screw can be tightened, the cable adjusting screw is tightened by tensioning the hand chain hoist;

[0046] (6) After tightening once, loosen the connection between the hand chain hoist and the wire rope, rewind the wire rope, and fix the hand chain hoist, waiting for the next level of tensioning and tightening of the cable;

[0047] (7) Repeat the above steps throughout the entire tensioning process, and finally complete the prestressing and tightening of the cable adjustment screw.

[0048] The above content is a further detailed description of the technical solution provided in combination with the preferred implementation mode of the present invention. It cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A construction method for a large-diameter prestressed steel cable tensioning and tightening device with a diameter greater than 100 mm, characterized in that: The tensioning and tightening device comprises a fixed bracket, a high-strength rope and a lifting device; the fixed bracket is fixed to the middle of the steel cable adjusting screw; two high-strength ropes are provided, which are respectively wound around the two ends of the adjusting screw; one end of each high-strength rope is fixed to the fixed bracket, and the other end is connected to the lifting device; Two high-strength ropes are wound around the adjusting screws in opposite directions; two lifting devices apply tension to both ends of the two high-strength ropes, and the installation positions are located on both sides of the steel cable adjusting screws; The fixing bracket adopts a detachable and adjustable structure, including two clamping plates respectively installed on the upper and lower sides of the adjusting screw, and two fixing screws respectively installed on the two ends of the clamping plate and connecting the upper and lower clamping plates; both ends of the clamping plate are provided with a plurality of bolt holes spaced along the length direction of the clamping plate, and the fixing screw can be selectively installed in any of the bolt holes; The lifting device adopts a hand chain hoist, one end of which is connected to a high-strength rope, and the other end is fixed to a surrounding fixed structure; The construction includes the following steps: (1) Select the appropriate clamping plate and matching fixing screw according to the specifications of the adjusting screw of the steel cable; (2) Place a clamping plate parallel to the upper and lower adjusting screws of the steel cable, and temporarily clamp and fix the two ends of the clamping plate with fixing screws; (3) Connect the two high-strength ropes to the bolt holes at the ends of the clamping plate through the shackles, and wind the two high-strength ropes around the adjusting screws of the steel cable in opposite directions; (4) One end of the two sets of hand chain hoists is connected to the end of the wound high-strength rope, and the other end is connected to the surrounding fixed structure, and the hand chain hoists are pre-tightened; (5) When the steel cable is tensioned to the point where the cable adjusting screw can be tightened, the cable adjusting screw is tightened by tensioning the hand chain hoist; (6) After tightening once, loosen the connection between the hand chain hoist and the high-strength rope, rewind the high-strength rope, and fix the hand chain hoist, waiting for the next level of tensioning and tightening of the cable; (7) Repeat the above steps throughout the entire tensioning process, and finally complete the prestressing and tightening of the cable adjustment screw.

2. The construction method of the large-diameter prestressed steel cable tensioning and tightening device with a diameter greater than 100 mm as claimed in claim 1, characterized in that: The high-strength rope is a steel wire rope.

3. The construction method of the large-diameter prestressed steel cable tensioning and tightening device with a diameter greater than 100 mm as claimed in claim 1, characterized in that: Two high-strength ropes are installed and connected diagonally on the fixed brackets.

4. The construction method of the large-diameter prestressed steel cable tensioning and tightening device with a diameter greater than 100 mm as claimed in claim 1, characterized in that: One end of the high-strength rope is provided with a shackle, which is detachably fixedly connected to the bolt hole on the clamping plate through the shackle.

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