A kind of external prestressed combined reinforcement method

Abstract

The present invention belongs to the technical field of prestressed steel strand tensioning and fixing, and specifically relates to an external prestressed combined reinforcement method, comprising the following steps: step S10: fix the clamp on the prestressed tensioning device, step S20: place the steel strand in the clamp and perform prestressed stretching; step S30: fix the fixture on the component to be reinforced; step S40: fix the other end of the clamp on the fixture so that the prestressed tensioning device is fixed on the fixture; step S50: after fixing, adjust the prestressed stretching through the prestressed tensioning device; step S60: after adjustment, remove the prestressed tensioning device to complete the reinforcement. This method first fixes the steel strand with a clamp, then performs prestressing force stretching in vitro, and then fixes it to the fixture with a clamp. At this time, the operator can adjust the prestressed stretching degree, and finally remove the prestressed tensioning device to complete the reinforcement. Compared with the existing scheme, this method simplifies the steps and saves time.

Description

Technical Field

[0001] The invention belongs to the technical field of prestressed steel strand tensioning and fixing, and in particular relates to an external prestressed combined reinforcement method. Background Art

[0002] At present, many buildings and bridges in my country have entered the maintenance and reinforcement period. There are also a large number of buildings that need to be renovated and reinforced to adapt to the rapid development of my country's society, economy, culture, etc., especially after the Wenchuan earthquake, many buildings across the country need to be seismically reinforced, which urgently requires efficient reinforcement methods.

[0003] At present, the existing simple tensioning and anchoring system for prestressed steel strands to reinforce concrete flexural members with announcement number CN101922238B includes a connection system consisting of steel strands, steel plate anchors and anchor bolts anchoring them on concrete flexural members, connecting steel plates or connecting members, bolts and nuts for applying prestress to the steel strands, and a steering system consisting of steel strands and steering members for changing the routing direction of the steel strands. In the present invention, the steel strands are turned and limited by the steering members, which reduces the number of tensioning ends, simplifies the tensioning procedure of the steel strands, improves construction efficiency, and shortens the construction period. The invention has the advantages of giving full play to the high tensile strength of the steel strands, improving the bearing capacity, stiffness, energy consumption capacity, ductility and durability of the reinforced concrete flexural members, improving construction efficiency, shortening the construction period, and having simple and easy construction technology, low cost, small construction operation space, and convenient on-site construction.

[0004] But there is also a problem: this solution can only perform pre-tensioning, and cannot be adjusted once fixed. Adjustment requires taking it down and re-pre-tensioning, which is very troublesome. Summary of the invention

[0005] This solution provides an external prestressed combined reinforcement method to solve the problem that it cannot be adjusted after fixation.

[0006] This solution provides an external prestressed combined reinforcement method, comprising the following steps: Step S10: fixing a clamp on a prestressed tensioning device,

[0007] Step S20: placing the steel strand in a fixture for prestressing;

[0008] Step S30: fixing the fixture on the component to be reinforced;

[0009] Step S40: fix the other end of the clamp to the fixture, so that the prestressed tensioning device is fixed to the fixture;

[0010] Step S50: After fixing, prestressing is adjusted by a prestressing tensioning device;

[0011] Step S60: After adjustment, the prestressed tensioning device is removed to complete the reinforcement.

[0012] The method first fixes the steel strand with a clamp, then stretches it with prestress outside the body, and then fixes it to the fixture with a clamp. At this time, the operator can adjust the prestress stretching degree, and finally remove the prestress tensioning device to complete the reinforcement. Compared with the existing solution, this method simplifies the steps and saves time.

[0013] Furthermore, the prestressed tensioning device in step S10 includes a base, a push block, a jack, a wire-releasing mechanism and a guide rail, the guide rail is fixedly connected to the base, the push block is slidably connected to the guide rail, there are two push blocks and wire-releasing mechanisms, and the push blocks are arranged in a mirror image of the base, the jack is detachably fixedly connected to the push blocks on both sides, the wire-releasing mechanism is used to place the steel strand, and the wire-releasing mechanism is fixedly connected to the push blocks; the clamp includes a convex clamp and a concave clamp, the convex clamp is coaxially arranged with the wire-releasing mechanism, the operator fixes the convex clamp to the base, the convex clamp is detachably fixedly connected to the base, the convex clamp is detachably fixedly connected to the concave clamp, and the steel strand is located between the convex clamp and the concave clamp.

[0014] The operator first fixes the convex clamp coaxially on the base, then places the steel strand on the convex clamp through the wire-release mechanism, and then places the concave clamp on the steel strand, and clamps it by bolting. The same operation is performed on the other side, so that both ends of the steel strand are fixed by the clamp. Finally, the operator fixes the jack between the push blocks. After completing the preparation work, the operator uses the jack to push the push block, and the push block drives the wire-release mechanism to move. The wire-release mechanism stretches the steel strand and stops after pulling to the set distance. Then the operator fixes the concave clamp to the fixture. At this time, the operator can also adjust the degree of stretching of the steel strand through the jack according to the site. After the adjustment is completed, the operator disassembles the connection of the convex clamp, so that the prestressed tensioning device is detached and the reinforcement is completed. This mechanism separates the stretching, which can be stretched in vitro and then fixed, saving time. At the same time, this solution can adjust the degree of stretching even after fixing.

[0015] Furthermore, the wire-releasing mechanism in steps S10-S20 includes a fixing pin and an outer ring, both of which are fixed on the push block, and a wire-releasing groove is formed between the fixing pin and the outer ring, and the operator places the steel strand in the wire-releasing groove, and the steel strand is located between the convex clamp and the concave clamp. The wire-releasing groove formed by the fixing pin and the outer ring is arc-shaped and has no sharp edge, which can effectively protect the steel strand from breaking when being pulled.

[0016] Furthermore, the other end of the clamp in step S40 is a concave clamp, and the operator fixes the concave clamp to the fixture through expansion bolts. The expansion bolts are not easy to fall off and are more stable.

[0017] Furthermore, a lubricant is applied between the guide rail and the push block in step S10. The lubricant can enhance the sliding of the guide rail and prevent the guide rail from getting stuck, which causes the steel strand to fail to stretch.

[0018] Furthermore, in step S20, when stretching the steel strand, the operator needs to place the device on a flat ground and stabilize it through a stabilizing mechanism, wherein the stabilizing mechanism includes a support column and a suction cup, wherein the support column cooperates with the guide rail, and the suction cup is fixedly connected to the support column. When the base is placed on a flat ground, the suction cup on the support column will contact the ground, so that the suction cup adheres to the ground, thereby preventing the device from sliding and flipping over during stretching.

[0019] Further, in step S40, the operator needs to fix the prestressed tensioning device on the fixture, and after the prestressed tensioning device is separated from the ground, the blocking plate can block the push block, the guide rail is provided with a plurality of rotating openings, the blocking plates are provided with a plurality of, and the plurality of blocking plates are rotatably connected to the rotating openings, the blocking plate is hinged to the support column, and the blocking plate cooperates with the push block.

[0020] When the prestressed tensioning device is placed on the ground, the support column will contact the ground and move upward. The upward movement of the support column will drive the blocking plate to rotate to a position flush with the guide rail, so that the push block can slide on the guide rail. When the operator has stretched it and picked up the prestressed tensioning device, the support column will move downward under the action of gravity, causing the blocking plate to reverse and tilt up, forming a blocking effect to prevent the jack from failing or the push block from being damaged, resulting in rapid rebound of the push block and causing personal injury. When the jack fails or the push block is damaged, the blocking plate will block the push block when the push block rebounds, thereby playing a buffering role. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of a prestressed tensioning device.

[0022] Figure 2 This is a structural diagram of a prestressed tensioning device and a convex clamp.

[0023] Figure 3 This is a structural diagram of a prestressed tensioning device and a clamp.

[0024] Figure 4 This is a structural diagram of a fixer.

[0025] Figure 5 This is a structural diagram of the prestressing tensioning device and the fixing device fixed on the component to be reinforced.

[0026] Figure 6 To remove the structural diagram of the prestressing tensioning device,

[0027] Figure 7The present invention is a structural diagram of a prestressed tensioning device with a stabilizing mechanism and a blocking plate.

[0028] The figure marks in the specification include: 1. push block; 2. guide rail; 3. base; 4. fixed block; 5. wire-releasing mechanism; 6. outer ring; 7. fixing pin; 8. convex clamp; 9. connecting port; 10. clamp hole; 11. concave clamp; 12. steel strand; 13. corresponding interface; 14. fixing hole; 15. fastener; 16. adjusting bolt; 17. gripper; 18. component to be reinforced; 19. blocking plate; 20. rotating port; 21. support column; 22. suction cup. DETAILED DESCRIPTION

[0029] Basically as attached Figure 1 , Figure 2 , Figure 3 , Figure 7 As shown:

[0030] The present invention relates to a prestressed tensioning device, including a base 3, a push block 1, a jack, a wire-releasing mechanism 5 and a guide rail 2. The guide rail 2 is fixedly connected to the base 3, the push block 1 is slidably connected to the guide rail 2, there are two push blocks 1 and wire-releasing mechanism 5, and the push block 1 is set in a mirror image of the base 3. The jack is detachably fixedly connected to the push blocks 1 on both sides. The wire-releasing mechanism 5 is used to place the steel strand 12. The wire-releasing mechanism 5 includes a fixing pin 7 and an outer ring 6. The fixing pin 7 and the outer ring 6 are both fixed on the push block 1. A wire-releasing groove is formed between the fixing pin 7 and the outer ring 6. The operator places the steel strand 12 in the wire-releasing groove, and the steel strand 12 is located between the convex clamp 8 and the concave clamp 11. The wire-releasing groove formed by the fixing pin 7 and the outer ring 6 is arc-shaped and has no sharp end, which can effectively protect the steel strand 12 from breaking when being pulled. The clamp includes a convex clamp 8 and a concave clamp 11. The convex clamp 8 is coaxially arranged with the outer ring 6. The operator fixes the convex clamp 8 on the base 3. The convex clamp 8 is detachably fixedly connected to the base 3. The convex clamp 8 is detachably fixedly connected to the concave clamp 11. The steel strand 12 is located between the convex clamp 8 and the concave clamp 11. The convex clamp 8 and the concave clamp 11 are provided with a clamp hole 10 and a connecting hole. The clamp hole 10 is used to fix the convex clamp 8 and the concave clamp 11. The connecting hole is used to fix with the fixer 15.

[0031] It also includes a stabilizing mechanism, which includes a support column 21 and a suction cup 22, the suction cup 22 is fixedly connected to the support column 21, and also includes a blocking plate 19. The guide rail 2 is provided with multiple rotating openings 20, and the blocking plate 19 and the support column 21 are provided with multiple, and multiple blocking plates 19 are rotatably connected with the rotating openings 20. The ends of multiple blocking plates 19 are hinged with the support column 21, so that the blocking plate 19 rotates when the support column 21 moves up and down. When the prestressed tensioning device is placed on the ground, the support column 21 will contact the ground and move up. The upward movement of the support column 21 will drive the blocking plate 19 to rotate to a position flush with the guide rail 2, so that the push block 1 can slide on the guide rail 2. When the operator stretches the prestressed tensioning device, the support column 21 will move down under the action of gravity, causing the blocking plate 19 to reverse and tilt up to form a blocking effect. A ruler is also provided on the guide rail 2 to facilitate observation of the stretching stroke.

[0032] As attached Figure 4 , Figure 5 As shown:

[0033] The fixture 15 is a sliding adjustable U-shaped fixture 15 with a rubber pad. A rubber pad is attached inside the fixture 15 to increase the contact friction between the fixture 15 and the member to be reinforced 18. First, the fixture 15 is pressed against the member to be reinforced 18, and the gripper 17 is tightened by adjusting the bolt 16 so that the U-shaped fixture 15 is completely pressed against the member to be reinforced 18. The fixture 15 is provided with a fixing hole 14 and a corresponding interface 13. The fixing hole 14 is used to fix the member to be reinforced 18, and the corresponding interface 13 is used to fix the fixture.

[0034] As attached Figure 1-7 As shown:

[0035] This scheme provides an external prestressed combined reinforcement method, comprising the following steps:

[0036] Step S10: Place the prestressed tensioning device on flat ground, with the support column 21 touching the ground, so that the suction cup 22 sticks to the ground to prevent the device from shaking, place a hydraulic jack in the middle of the slide rail, and then fix the convex clamp 8 on the outer ring 6 of the push block 1, and use the semicircular fixing pin 7 on the fixing block 4 to fix the convex clamp 8.

[0037] Step S20: After the steel strand 12 is tied and fixed to the push blocks 1 on both sides, the initial tightening and fixing is completed. Install the concave clamp 11 into the prestressed tensioning device. After installing the concave clamp 11, connect the bolts at the clamp hole 10 on the convex and concave clamp 11 to fully clamp the steel strand 12. Use a hydraulic jack to complete the prestressed tensioning. The tensioning force is 30% to 50% (safety range) of the ultimate bearing capacity of the steel strand 12. A length ruler is attached to the tensioning device for subsequent docking. After the prestressed tensioning process is completed and safety is confirmed, the rope buckle can be untied.

[0038] Step S30: The fixer 15 is placed tightly against the member to be reinforced 18, and the gripper 17 is tightened by adjusting the bolt 16, so that the U-shaped fixer 15 is completely pressed against the member to be reinforced 18. Drill holes at the positions corresponding to the fixing holes 14 of the member to be reinforced 18 and insert expansion bolts (this step can be selected according to the site conditions). At this point, the fixation of the fixer 15 is completed. The fixer 15 is fixed to the member to be reinforced 18, and the fixing process can be carried out simultaneously with the prestressing process, which is more efficient.

[0039] Step S40: Connect the connection port 9 of the fixer 15 on the steel strand 12 clamp with the corresponding interface 13 on the fixer 15. At this time, the prestressed tensioning device will be moved. When the prestressed tensioning device is picked up, the support column 21 will move downward under the action of gravity, causing the blocking plate 19 to reverse and tilt up to form a blocking effect to prevent the jack from failing or the push block 1 from being damaged, resulting in rapid rebound of the push block 1 and causing personal injury. When the jack fails or the push block 1 is damaged, the blocking plate 19 will block the push block 1 when the push block 1 rebounds, thereby playing a buffering role.

[0040] Step S50: After fixation, the prestressing tensioning device is used to adjust the prestressing tension. After the adjustment is stable, the hydraulic jack can be removed.

[0041] Step S60: After adjustment, the prestressed tensioning device is removed to complete the reinforcement.

[0042] The beneficial effects of this solution are as follows: 1. This method first fixes the steel strand 12 with a clamp, then performs pre-tightening in vitro, and then fixes it to the fixture 15 with a clamp. At this time, the operator can adjust the degree of prestressing, and finally remove the prestressing tensioning device to complete the reinforcement. Compared with the existing solutions, this method simplifies the steps and saves time. 2. This solution can move the prestressing tensioning device to prevent the jack from failing or the push block 1 from being damaged, and the push block 1 from rebounding to injure the staff.

[0043] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An external prestressed combined reinforcement method, characterized in that: The following steps are involved: step S10: Fix the fixture on the prestressing tensioning device. Step S20: placing the steel strand (12) in a fixture and performing prestressing stretching; Step S30: fixing the fixer (15) on the body of the component (18) to be reinforced; Step S40: fixing the other end of the clamp on the fixture (15), so that the prestressing tensioning device is fixed on the fixture (15); Step S50: After fixing, prestressing is adjusted by a prestressing tensioning device; Step S60: After adjustment, the prestressing tensioning device is removed to complete the reinforcement; The prestressed tensioning device in step S10 comprises a base (3), a push block (1), a jack, a wire-releasing mechanism (5) and a guide rail (2), wherein the guide rail (2) is fixedly connected to the base (3), the push block (1) is slidably connected to the guide rail (2), two push blocks (1) and a wire-releasing mechanism (5) are provided, and the push block (1) is arranged in a mirror image of the base (3), the jack is detachably fixedly connected to the push blocks (1) on both sides, and the wire-releasing mechanism (5) is used to place the steel strand (1) 2), and the wire-releasing mechanism (5) is fixedly connected to the push block (1); the clamp comprises a convex clamp (8) and a concave clamp (11), the convex clamp (8) and the wire-releasing mechanism (5) are coaxially arranged, the operator fixes the convex clamp (8) on the base (3), the convex clamp (8) and the base (3) are detachably fixedly connected, the convex clamp (8) and the concave clamp (11) are detachably fixedly connected, and the steel strand (12) is located between the convex clamp (8) and the concave clamp (11); The device also includes a stabilizing mechanism, which includes a support column (21) and a suction cup (22), wherein the suction cup (22) is fixedly connected to the support column (21), and further includes a blocking plate (19), wherein a plurality of rotating openings (20) are provided on the guide rail (2), and the blocking plate (19) and the support column (21) are provided with a plurality of blocking plates (19), and the plurality of blocking plates (19) are rotatably connected to the rotating openings (20); In step S40, the operator needs to fix the prestressed tensioning device on the fixing device (15). After the prestressed tensioning device is detached from the ground, the blocking plate (19) can block the push block (1). The guide rail (2) is provided with a plurality of rotating openings (20). The blocking plate (19) is provided with a plurality of, and the plurality of blocking plates (19) are rotatably connected to the rotating openings (20). The blocking plate (19) is hinged to the support column (21), and the blocking plate (19) cooperates with the push block (1).

2. The external prestressed combined reinforcement method according to claim 1, characterized in that: The wire-releasing mechanism (5) in steps S10-S20 comprises a fixing pin (7) and an outer ring (6), wherein the fixing pin (7) and the outer ring (6) are both fixed on the push block (1), and a wire-releasing groove is formed between the fixing pin (7) and the outer ring (6). An operator places the steel strand (12) in the wire-releasing groove, and the steel strand (12) is located between the convex clamp (8) and the concave clamp (11).

3. The external prestressed combined reinforcement method according to claim 1, characterized in that: The other end of the clamp in step S40 is a concave clamp (11), and the operator fixes the concave clamp (11) to the fixer (15) by means of expansion bolts.

4. The external prestressed combined reinforcement method according to claim 1, characterized in that: In step S10, lubricant is applied between the guide rail (2) and the push block (1).

5. The external prestressed combined reinforcement method according to claim 1, characterized in that: In the step S20, when stretching the steel strand (12), the operator needs to place the device on a flat ground and stabilize it by means of a stabilizing mechanism, wherein the stabilizing mechanism comprises a support column (21) and a suction cup (22), wherein the support column (21) cooperates with the suction cup (22), and the suction cup (22) is fixedly connected to the support column (21).

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