Device for releasing and releasing whole bundle of steel strands and withdrawing anchor

Abstract

The utility model relates to a device for releasing, tensioning and withdrawing an anchor from a whole bundle of steel strands, which solves the problems that the withdrawing space of a clamping piece of the whole bundle of steel strands is narrow, and the distance between a center hole jack and a working anchor is determined by a hole and a limiting piece on a support frame. The supporting frame comprises a first fixing ring and a second fixing ring, the steel strand set penetrates through coaxial and same-diameter holes of the first fixing ring hole and the second fixing ring hole and the center hole jack to be connected with the tool anchorage device and the tool clamping piece, the inner diameter of the first fixing ring hole is smaller than the diameter of the working anchorage device, and the supporting rods are fixedly connected with the first fixing ring and the second fixing ring on the first fixing ring and the second fixing ring. The right end of the supporting rod is provided with threads matched with a threaded hole in the first fixing ring, the supporting rod is movably matched with a hole in the second fixing ring, the left end of the supporting rod is provided with threads matched with a nut located on the right side of the second fixing ring, and a baffle ring is arranged between the second fixing ring and the left side of the center hole jack.

Description

Technical Field

[0001] The utility model relates to a prestressed steel strand whole bundle tensioning and anchoring release device. Background Art

[0002] During the construction of concrete cantilever arch bridges, the inclined buckle hanging method is required before the arch ring is closed. Two groups (7 to 19 strands) of buckle cables are installed on the cast cantilever segments and a certain tension is applied. The tension point is the transition pier between the arch ring and the rear anchor system. Two groups (7 to 19 strands) of anchor cables are installed between the transition pier and the rear anchor system and a certain tension is applied to ensure the dynamic balance of the transition pier to achieve the system balance of the cantilever arch ring. As the number of cast segments increases, the buckles and anchor cable strands need to be stress-released (also known as tensioning and anchor withdrawal) and removed at intervals.

[0003] The traditional method of releasing and unanchoring steel strands is to use a front-clip jack to first apply a certain tension to the single strand. After the single strand is subjected to tension, the working clip will loosen, and then a small steel rod is used to pick out the working clip. Finally, the front-clip jack is loosened, and the stress of the single strand will be released. The two groups of anchor cables repeat the above process alternately until the stress of all the strands is completely released and the release and unanchoring work is completed. Since the release and unanchoring is carried out one by one, the jack needs to change its position between the two groups of steel strands in a cycle, and the construction efficiency is low. The release of the two groups of anchor cables also needs to be carried out synchronously. At the same time, as the number of steel strands that release stress gradually increases, the number of steel strands that are stressed becomes less and less. When the sum of the maximum breaking force of the remaining steel strands participating in the stress is less than the tension of the main arch ring or the rear anchor system, the remaining steel strands may be broken or fractured, affecting the safety of the concrete arch ring structure and the safety of on-site construction. The characteristic of the anchor cable steel strand tensioning and anchor withdrawal work is that the jack position is changed many times, which affects the on-site construction efficiency. The most important thing is that the steel strands may break or fracture when tensioning and anchor withdrawal to the last few steel strands, affecting the safety of the concrete arch ring structure and the safety of on-site construction. Summary of the invention

[0004] The utility model aims to provide a device for tensioning and unanchoring a whole bundle of steel strands, which has a clip withdrawal space around the periphery of the whole bundle of steel strands, and the length of the support rod is selected according to the distance between the through-hole jack and the working anchor. The device is convenient to assemble and can tension and unanchor a whole bundle of multi-strand steel strands in one process, and has a high tensioning and unanchoring efficiency.

[0005] The utility model is achieved in this way:

[0006] The whole-bundle steel strand tensioning and unanchoring device comprises an anchor pad 1, a working anchor 2 arranged on the left side of the anchor pad is fitted with the right side of a support frame 4, a steel strand group 3 passes through the working anchor 2 and is located in the support frame 4, the left side of the support frame is fitted with the right side of a through-hole jack 5, a lifting lug 6 is fixedly connected to the top of the through-hole jack, a tool anchor 7 and a tool clip 8 are installed on the left side of the through-hole jack, the support frame 4 comprises a first fixing ring 401 fitted with the working anchor 2 and a second fixing ring 403 close to the right side of the through-hole jack 5, the steel strand group passes through the coaxial and same-diameter holes of the first and second fixing ring holes and the through-hole jack and is connected with the tool anchor 7 and the tool clip 8, The inner diameter of the first fixing ring hole is smaller than the diameter of the working anchor 2. A number of support rods 402 are located between the first and second fixing rings to fix the two together. The spacing between two adjacent support rods 402 is equal. The right end of the support rod has a thread that cooperates with the threaded hole on the first fixing ring. The support rod is dynamically matched with the hole on the second fixing ring. The left end of the support rod has a thread that cooperates with the nut located on the right side of the second fixing ring. There is a retaining ring 15 between the second fixing ring and the left side of the through-hole jack. A number of notches corresponding to the nuts are opened around the retaining ring, and the thickness of the retaining ring is greater than the thickness of the nut.

[0007] Beneficial effects of the utility model

[0008] After the utility model adopts the above structure, through the coordination of anchor pad 1, working anchor 2, steel strand group 3, support frame 4, through-hole jack 5, jack lifting lug 6, tool anchor 7 and clip 8. When withdrawing anchor, the support frame is sleeved on the steel strand group to make it close to the surface of the working anchor, and then the through-hole jack is installed, and the tool anchor and clip are installed on the outside of the through-hole jack. After the installation is completed, the through-hole jack is tensioned synchronously. At this time, the through-hole jack will be stressed, and the clip on the working anchor will be loosened. Like the front card jack, the clip is picked out with a small steel rod needle. After all are picked out, the through-hole jack is gradually loosened, and all steel strands are loosened to avoid the dangerous situation caused by tensioning one by one.

[0009] There is a clip withdrawal space around the whole bundle of steel strands. The length of the support rod is selected according to the distance between the through-hole jack and the working anchor. It is easy to combine and the whole bundle of multi-strand steel strands can be deployed and anchored in one process with high deployment and anchoring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Figure 2 A schematic diagram of the support frame structure.

[0012] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0013] 1. Anchor plate; 2. Working anchor; 3. Steel strand group; 4. Support frame; 401. First fixing ring; 402. Fixed support rod; 403. Second fixing ring; 5. Through-hole jack; 6. Lifting ear; 7. Tool anchor; 8. Tool clip; 9. First screw; 10. Threaded hole; 11. Insert rod; 12. Insert hole; 13. Second screw; 14. Nut; 15. Retaining ring; 16. Notch. DETAILED DESCRIPTION

[0014] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0015] The whole-bundle steel strand tensioning and unanchoring device comprises an anchor pad 1, a working anchor 2 arranged on the left side of the anchor pad is fitted with the right side of a support frame 4, a steel strand group 3 passes through the working anchor 2 and is located in the support frame 4, the left side of the support frame is fitted with the right side of a through-hole jack 5, a lifting lug 6 is fixedly connected to the top of the through-hole jack, a tool anchor 7 and a tool clip 8 are installed on the left side of the through-hole jack, the support frame 4 comprises a first fixing ring 401 fitted with the working anchor 2 and a second fixing ring 403 close to the right side of the through-hole jack 5, the steel strand group passes through the coaxial and same-diameter holes of the first and second fixing ring holes and the through-hole jack and is connected with the tool anchor 7 and the tool clip 8, The inner diameter of the first fixing ring hole is smaller than the diameter of the working anchor 2. A number of support rods 402 are located between the first and second fixing rings to fix the two together. The spacing between two adjacent support rods 402 is equal. The right end of the support rod has a thread that cooperates with the threaded hole on the first fixing ring. The support rod is dynamically matched with the hole on the second fixing ring. The left end of the support rod has a thread that cooperates with the nut located on the right side of the second fixing ring. There is a retaining ring between the second fixing ring and the left side of the through-hole jack. A number of notches corresponding to the nuts are opened around the retaining ring, and the thickness of the retaining ring is greater than the thickness of the nut.

[0016] See also Figure 1-2 A device for tensioning and de-anchoring a whole bundle of steel strands comprises an anchor pad 1, a working anchor 2 and a steel strand group 3 are arranged on the left side of the anchor pad 1, a support frame 4 is arranged on the outer ring of the steel strand group 3 and is fitted with the working anchor 2 to play a supporting role, a through-hole jack 5 is fitted on the left side of the support frame 4, a lifting ear 6 is fixedly connected to the top of the through-hole jack 5 and is used to move the through-hole jack 5, and a tool anchor 7 and a tool clip 8 are installed on the outside of the through-hole jack 5.

[0017] The support frame 4 includes a first fixing ring 401 that is fitted with the working anchor 2, and the thickness of the first fixing ring 401 is 30 mm. On the left side of the first fixing ring 401, a plurality of fixed support rods 402 distributed in a circular array are detachably arranged, and the number of fixed support rods 402 is five, and the length thereof is 150 mm. On the left side of each fixed support rod 402, a second fixing ring 403 is detachably connected to each other, and the thickness of the second fixing ring 403 is 30 mm. The first fixing ring 401 and the second fixing ring 403 are both sleeved on the steel strand group 3.

[0018] The right end of the fixed support rod 402 is fixedly connected with the first screw rod 9, and a threaded hole 10 adapted to the first screw rod 9 is provided on the first fixed ring 401. The diameters of the first screw rod 9 and the threaded hole 10 are both 24 mm, and the length of the first screw rod 9 is 30 mm. The fixed support rod 402 is detachably connected to the first fixed ring 401 through the cooperation between the first screw rod 9 and the threaded hole 10. The left end of the fixed support rod 402 is fixedly connected with the plug rod 11, and the length of the plug rod 11 is 30 mm and the diameter is 24 mm. A plurality of sockets 12 adapted to the plug rod 11 are provided through the second fixed ring 403, and the diameter of the sockets 12 is 25 mm. The second fixed ring 403 is movably sleeved on the plug rod 11 through the sockets 12, and a second screw rod 13 is integrally formed at the left end of the plug rod 11, and the length of the second screw rod 13 is 20 mm. A nut 14 located outside the second fixing ring 403 is threadedly connected to the second screw rod 13, and the thickness of the nut 14 is 20 mm. The fixed support rod 402 is detachably connected to the second fixing ring 403 through the cooperation of the insertion rod 11, the insertion hole 12, the second screw rod 13 and the nut 14.

[0019] A retaining ring 15 is arranged on the left side of the second fixing ring 403, and a plurality of notches 16 corresponding to the nuts 14 are opened on the retaining ring 15. The thickness of the retaining ring 15 is greater than that of the nuts 14. The setting of the retaining ring 15 can ensure that the contact surface on the left side of the support frame 4 is flat, and ensure that the second screw rod 13 and the nut 14 will not be squeezed during use.

[0020] When in use, the support frame 4 is sleeved on the steel strand group 3 so that it is attached to the surface of the working anchor 2, and then the tower base or crane is used to lift the jack lifting ear 6 to make the through-hole jack 5 fit the support frame 4, and the tool anchor 7 and tool clip 8 are installed on the outside of the through-hole jack 5. After the installation is completed, the through-hole jack 5 is tensioned synchronously. At this time, the through-hole jack 5 will be stressed, and the clip on the working anchor 2 will be loosened. Like the front card jack, a small steel rod needle is used to pick out the clip. After all of them are picked out, the through-hole jack 5 is gradually loosened, all the steel strands are loosened, and the anchor withdrawal and tensioning are completed.

[0021] The material of this device is Q355 steel, which has good toughness and welding performance and is relatively cheap and cost-effective.

[0022] The fixed support rod 2 is made of a steel bar.

Claims

1. A device for releasing and unanchoring a whole bundle of steel strands, characterized in that: The invention comprises an anchor plate (1), a working anchor (2) arranged on the left side of the anchor plate is fitted with the right side of a support frame (4), a steel strand group (3) passes through the working anchor and is located in the support frame, the left side of the support frame is fitted with the right side of a through-hole jack (5), a lifting lug (6) is fixedly connected to the top of the through-hole jack, a tool anchor (7) and a tool clip (8) are installed on the left side of the through-hole jack, the support frame comprises a first fixing ring (401) fitted with the working anchor and a second fixing ring (403) close to the right side of the through-hole jack, the steel strand group passes through the coaxial and same-diameter holes of the first and second fixing ring holes and is connected to the through-hole jack, the tool anchor and the tool clip, The inner diameter of the first fixing ring hole is smaller than the diameter of the working anchor. A plurality of support rods (402) are located between the first and second fixing rings to fix the two together. The spacing between two adjacent support rods is equal. The right end of the support rod has a thread that cooperates with the threaded hole on the first fixing ring. The support rod is dynamically matched with the hole on the second fixing ring. The left end of the support rod has a thread that cooperates with the nut located on the right side of the second fixing ring. A retaining ring (15) is provided between the second fixing ring and the left side of the through-hole jack. A plurality of notches corresponding to the nuts are provided around the retaining ring. The thickness of the retaining ring is greater than the thickness of the nut.

Images