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Anti-loosening overall dismounting device for temporary inhaul cable clamping piece of prestressed steel strand

A technology of prestressed steel strands and dismantling devices, which is applied in the direction of erecting/assembling bridges, bridges, buildings, etc., and can solve the problem of decreasing pressure between the tapered clip and the anchor plate, loosening and springback of the cable tapered clip, etc. question

Active Publication Date: 2021-09-14
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to dynamic loads such as vehicle loads and wind loads, the structure is inevitably in a state of vibration for a long time, which makes the prestressed beam unable to provide continuous tension to the tapered clip, resulting in pressure changes between the tapered clip and the anchor plate. Small, resulting in temporary cable tapered clips loosening, falling off, and even rebounding of the prestressed beam, causing engineering accidents; in addition, because the clips will be stuck in the anchor plate and steel strands under the action of prestress during the anchoring process , so when dismantling the anchor, the on-site construction personnel often can only use simple tools such as crowbars or steel bars to remove the clip from the anchor plate, but due to the limitation of the working space, it is very difficult to remove, which affects the progress of the project

Method used

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  • Anti-loosening overall dismounting device for temporary inhaul cable clamping piece of prestressed steel strand
  • Anti-loosening overall dismounting device for temporary inhaul cable clamping piece of prestressed steel strand
  • Anti-loosening overall dismounting device for temporary inhaul cable clamping piece of prestressed steel strand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Temporary cables are normally anchored, such as Figure 1~4 As shown, the specific anchoring process is as follows:

[0029] The first step is to form a detachable clip 1 with multiple clips, and put it into the groove of the sleeve 2;

[0030] In the second step, the prestressed beam 3 that needs to be stretched passes through the holes reserved on the anchor plate 5, the detachable clip 1, the sleeve 2 and the special limiting plate 7, and the position of the special limiting plate 7 is adjusted. ; The special limiting plate 7 has a deep groove, which is used to accommodate the detachable clip 1 with the sleeve 2, and a hole is reserved at the position where the prestressed beam 3 passes, which is only used for the tension of the prestressed beam 3 process, and can also play the role of a counter force frame.

[0031] In the third step, the jack is placed on the rear end of the special limiting plate 7, and the normal tensioning process is carried out;

[0032] The...

Embodiment 2

[0036] Remove the anchorage. When the temporary cable is used, the anchorage needs to be removed, such as Figure 5 As shown, the specific anchor unloading process is as follows:

[0037] The first step is to loosen the screw rod 6, and separate the cover plate 4 from the anchor plate 5 by a certain distance, so that the groove in the sleeve 2 no longer abuts against the protruding ring at the end of the detachable clip 1;

[0038] The second step is to place the reaction force seat 8, and put the anchor unloading jack on the reaction force seat 8 at the rear end of the cover plate 4;

[0039] The third step is to carry out the overall tensioning when unloading the anchor. When tensioning, the cover plate 4 is used to drive the sleeve 2 and the detachable clip 1 to withdraw from the anchor hole of the anchor plate 5 for a certain distance, and then the tension is performed;

[0040]The fourth step repeats the operation process of the third step until the cover plate 4 drives ...

Embodiment 3

[0042] Further, another structure of the detachable clip 1 is to use the gap between the two clips to make the raised ring snap into the groove on the inner wall of the sleeve 2, so that the sleeve 2 can be connected with the Disassemble the connection of clip 1. This connection method has unstable connection. For example, under external influences such as vibration, there is only a gap between the two clips. At this time, it will not only affect the detachable clip 1. The connection effect with the sleeve 2, and the detachable clip 1 is also easy to cause cutting effect on the prestressed beam 3, forming a safety hazard. In order to solve this disadvantage, at the same time ensure that the cover plate 4 can be used to disassemble the detachable clip 1 and the sleeve 2 as a whole when disassembling the anchorage, so that the two adjacent clips of the detachable clip 1 are far away from the end of the raised ring to form a A certain included angle, so that the clip flaps are be...

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PUM

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Abstract

The invention discloses an anti-loosening overall dismounting device for a temporary inhaul cable clamping piece of a prestressed steel strand. The device comprises an anchor plate, a detachable clamping piece, a prestressed tendon, a sleeve and a cover plate; the cover plate is detachably connected with the anchor plate; the detachable clamping piece and the sleeve are arranged on the prestressed tendon in a sleeving mode and located between the anchor plate and the cover plate; the sleeve is detachably connected with the cover plate, and the detachable clamping piece abuts against the anchor plate; a protruding ring is fixed to the end, away from the anchor plate, of the detachable clamping piece, the inner diameter of the end, away from the cover plate, of the sleeve is matched with the protruding ring, and the inner diameter of the end, close to the cover plate, of the sleeve is matched with a prestressed tendon; and a groove is formed in the inner wall of the sleeve, and the protruding ring is matched with the groove. The detachable clamping piece and the anchor plate can be in a pre-pressing state all the time, and the risks that the clamping piece is likely to loosen and fall off and the prestressed tendon rebounds are eliminated; and moreover, quick integral anchor unloading after use can be realized, and the problem that the clamping piece is difficult and slow to disassemble by constructors is solved.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a loosening-preventing overall disassembly device for temporary cable clips of prestressed steel strands. Background technique [0002] At present, the commonly used anchor clips are usually used to drive the tapered clips to wedge into the anchor plate by the retraction of the prestressed beams after the tension of the prestressed beams is completed. The pressure interaction between the tapered clip and the anchor plate clamps the prestressed bundle to realize the anchoring of the prestressed bundle. [0003] However, due to dynamic loads such as vehicle loads and wind loads, the structure is inevitably in a state of vibration for a long time, which makes the prestressed beam unable to provide continuous tension to the tapered clip, resulting in pressure changes between the tapered clip and the anchor plate. Small, resulting in temporary cable tapered clips loosenin...

Claims

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Application Information

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IPC IPC(8): E01D21/00E04G21/12
CPCE01D21/00E04G21/12
Inventor 韩龙宾方自安姜磊黄耕张文学张子杰杨帆刘吉昌
Owner BEIJING UNIV OF TECH