CN211815509U - Low-retraction anchoring device for wedge-shaped prestressed tendons - Google Patents
Low-retraction anchoring device for wedge-shaped prestressed tendons Download PDFInfo
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- CN211815509U CN211815509U CN201922180518.9U CN201922180518U CN211815509U CN 211815509 U CN211815509 U CN 211815509U CN 201922180518 U CN201922180518 U CN 201922180518U CN 211815509 U CN211815509 U CN 211815509U
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Abstract
The utility model provides a wedge prestressing tendons is with low anchor that contracts, this prestressing tendons is with low anchor that contracts including low anchor slab, clamping piece, wedge backing plate, anchor backing plate, the spiral muscle that contracts, low contract and install between anchor slab and the anchor backing plate the wedge backing plate. The utility model has the advantages that the utility model particularly solves the problem that the flat anchorage device can not realize low-retraction tensioning. The utility model has simple and reasonable structure, can meet various strength requirements, can not only meet the high strength requirement of bridge design, but also can be used by matching the inclined plane of the wedge-shaped backing plate arranged between the low-retraction anchor plate and the anchor backing plate, and can effectively control the retraction amount of the anchorage device within 1mm by pushing the wedge-shaped backing plate (compensating clearance) during secondary tensioning; one-time pushing in place, simple and convenient operation.
Description
Technical Field
The utility model relates to a prestressed anchorage utensil is used in the bridge construction, especially relates to a wedge prestressed tendons is with low anchor that contracts.
Background
The low-retraction anchorage device is particularly suitable for beam bridges and cable-stayed bridges adopting medium-short prestressed steel beams, the existing low-retraction anchorage devices are all round anchorage devices, and two times of tensioning construction processes are adopted: the steel strand is tensioned according to a conventional prestress tensioning process for the first time, so that the clamping piece in the anchor plate clamps the prestressed tendon, and the retraction amount of the steel strand is generally 4-6 mm at the moment; and tensioning for the second time, and screwing down the nut outside the anchor plate for fixing after the design tensioning force of the steel strand is reached, so that the retraction loss of the prestress tensioning is reduced, and the retraction amount of the steel strand can be controlled within 1mm under an ideal state. However, the prior low retraction anchorage has the following disadvantages: 1) in the prestress construction process, the nut is screwed by manual operation, and generally needs to be screwed for 2-3 circles, but because the beam end space for installing the anchorage device is very small, and the tool (supporting leg) for secondary tensioning support covers the upper part of the anchorage device, the screwing action of the nut is greatly hindered, and if the nut is not screwed tightly, the effective prestress cannot meet the design requirement. 2) The size of the thread between the anchor plate and the nut has deviation, if the clearance is small, the nut cannot be screwed on the external thread of the anchor plate easily, and troubles are brought to tensioning construction; if the clearance is large, the retraction amount of the anchorage device is large, the prestress loss is large, and the design requirement cannot be met. Reducing the practical utility value of the low retraction anchor.
SUMMERY OF THE UTILITY MODEL
The utility model provides a wedge-shaped prestressing tendons is with low anchor that contracts especially has solved the big problem of the volume that contracts after flat ground tackle stretch-draw.
The utility model provides a wedge prestressing tendons is with low anchor that contracts, including low anchor slab, clamping piece, wedge backing plate, anchor backing plate, the spiral muscle that contracts, low contract and install between anchor slab and the anchor backing plate the wedge backing plate.
As a further improvement of the utility model, one side of the force bearing surface of the wedge-shaped base plate is designed into an inclined plane.
As a further improvement of the utility model, the two sides of the force bearing surface of the wedge-shaped base plate are designed into inclined planes.
As a further improvement of the utility model, the low anchor plate that contracts can be designed into circular anchor plate.
As a further improvement of the utility model, the low anchor plate that contracts is equipped with the taper hole, the clamping piece adopts two formula (or multi-disc) structures, and its two (or multi-disc) make up the back and the low taper hole cooperation that contracts the anchor plate that contracts.
As a further improvement of the utility model, the low-retraction anchor plate is distributed with a single or a plurality of arranged taper holes.
The utility model also provides a prestressing tendons is with low method of using that contracts anchor that contracts, when making prestressed concrete component, the reinforcement cage has been banded, arrange anchor backing plate, the spiral muscle, prestressing tendons, then the pouring concrete, when concrete component intensity reaches the designing requirement, install wedge backing plate, low anchor slab and clamping piece that contracts on concrete component, install the limiting plate again, the jack, instrument anchor slab and instrument clamping piece, utilize the jack, the limiting plate, the tensile prestressing tendons of instrument anchor, return oil off-load after the pulling force reaches the control value, prestressing tendons kick-backs, bring the clamping piece into the taper hole of low anchor slab that contracts, thereby the centre gripping prestressing tendons, but at prestressing tendons's in-process, prestressing tendons and clamping piece produce the contracting of 4 ~ 6mm for low anchor slab that contracts, carry out the second time again after the supporting tool is installed, prestressing tendons stretch-draw this moment, The clamping piece and the low-retraction anchor plate cannot slide, when the second tension reaches a control value, a gap of 4-6 mm is formed between the low-retraction anchor plate and the anchor backing plate, the wedge backing plate is pushed to be tightly cushioned between the low-retraction anchor plate and the anchor backing plate, the wedge backing plate is pushed to be in place at one time, and then the jack is subjected to oil return unloading, so that the purpose of low retraction after tensioning is achieved.
The utility model has the advantages that: the utility model provides a flat ground tackle can't realize the problem of the stretch-draw that contracts of returning. The utility model has simple and reasonable structure, can meet various strength requirements, not only can reach the high strength requirement of bridge design, but also is matched with the inclined plane of the wedge-shaped backing plate arranged between the low retraction anchor plate and the anchor backing plate for use, the stress surface is not easy to deform, thereby effectively controlling the retraction amount of the anchorage device within 1 mm; when the wedge-shaped base plate is stretched for the second time, the wedge-shaped base plate is pushed to be in place for the first time, and the operation is simple and convenient.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of the wedge-shaped base plate structure of the present invention;
fig. 3 is a schematic view of the structure with the bellows installed.
Detailed Description
The prestressed tendon is 1, the clamping piece is 2, the low-retraction anchor plate is 3, the wedge-shaped backing plate is 4, the anchor backing plate is 5, the spiral tendon is 6, and the corrugated pipe is 7.
As shown in fig. 1 and 2, the utility model discloses a wedge prestressing tendons is with low anchor that contracts, the utility model discloses the secondary stretch-draw of being convenient for has solved the stretch-draw operation that current flat ground tackle exists inconvenient, the volume that contracts is bigger than normal, can't realize the low shortcoming such as stretch-draw that contracts.
The utility model discloses wedge-shaped prestressing tendons is with low anchor that contracts, including low anchor slab 3, wedge backing plate 4, anchor backing plate 5, clamping piece 2, the spiral muscle 6 that contracts, low contract and install between anchor slab 3 and the anchor backing plate 5 wedge backing plate 4.
The prestressed tendons 1 penetrate through the anchor backing plate 5, the spiral tendons 6, the wedge-shaped backing plate 4 and the low-retraction anchor plate 3.
One or two bearing surfaces of the wedge-shaped base plate 4 are designed to be inclined surfaces, and the number of the wedge-shaped base plates 4 is N (N can be 1-100).
The clip 2 is mounted with the low retraction anchor plate 3.
The low retraction anchor plate 3 is provided with a taper hole, the clamping piece 2 adopts a two-piece or multi-piece structure, and the two-piece or multi-piece structure is matched with the taper hole of the low retraction anchor plate 3 after being combined.
And single or a plurality of arranged taper holes are distributed on the low retraction anchor plate 3.
The utility model discloses a cooperation of the wedge backing plate of installation between low back-retraction anchor plate and the anchor backing plate is used, makes 4 tight pads of wedge backing plate in the secondary stretch-draw make the ground tackle return the volume of contracting within 1mm really through promoting 4 tight pads of wedge backing plate between low back-retraction anchor plate 3 and anchor backing plate 5 (compensation gap), and easy operation is convenient. In particular, the problem of large retraction amount of the flat anchorage device is solved, and the anchorage performance of the anchorage device is greatly improved.
The utility model also discloses a use method of the low-retraction anchor device for the prestressed tendon, when manufacturing the prestressed concrete member, binding a steel reinforcement cage, arranging an anchor backing plate 5, a spiral rib 6 and the prestressed tendon 1 (the cable can also be threaded after the hole forming of the prestressed hole channel), then pouring concrete, when the strength of the concrete member reaches the design requirement, installing a wedge backing plate 4, a low-retraction anchor plate 3 and a clamping piece 2 on the concrete member, then installing a limiting plate, a jack, a tool anchor plate and a tool clamping piece, utilizing the jack, the limiting plate and the tool anchor to stretch the prestressed tendon 1, when the tensile force reaches the control value, returning oil and unloading, the prestressed tendon 1 rebounds, bringing the clamping piece 2 into the taper hole of the low-retraction anchor plate 3, thereby clamping the prestressed tendon 1, but in the process of rebounding of the prestressed tendon 1, the prestressed tendon 1 and the clamping piece 2 generate the retraction of 4-6 mm relative to the low-retraction anchor plate 3, after the supporting tool is installed, tensioning is carried out for the second time, at the moment, the prestressed ribs 1, the clamping pieces 2 and the low retraction anchor plates 3 cannot slide, after the second tension reaches a control value, gaps of 4-6 mm are generated between the low retraction anchor plates 3 and the anchor backing plates 5, the wedge backing plates 4 are pushed to enable the wedge backing plates 4 to be tightly padded between the low retraction anchor plates 3 and the anchor backing plates 5 (compensation gaps), the first pushing is carried out in place, then the jacks return oil are unloaded, the purpose of low retraction after tensioning is achieved, at the moment, the retraction amount of the low retraction anchor is controlled within 1mm, and the anchoring efficiency is greatly improved.
The low retraction anchor plate 3 is provided with a single or a plurality of arranged taper holes, and the taper holes are consistent with those of the anchor plate at the common tensioning end; one end surface of the wedge-shaped base plate 4 is designed into an inclined surface; during secondary tensioning, the wedge-shaped backing plate 4 is pushed to the small end face of the taper hole of the low retraction anchor plate 3, and the wedge-shaped backing plate is pushed in place at one time, so that the operation is simple and convenient.
As shown in fig. 3, the low-retraction anchor device for the prestressed tendons further comprises a corrugated pipe 7, wherein the corrugated pipe 7 is positioned below the anchor backing plate 5, and the spiral tendons 6 are wound around the corrugated pipe 7.
The utility model discloses technical advantage: the utility model has simple and reasonable structure, can meet various strength requirements, can not only meet the high strength requirement of bridge design, but also can use the inclined plane of the wedge-shaped backing plate 4 arranged between the low retraction anchor plate 3 and the anchor backing plate 5 in a matching way, has larger stress surface than the existing low retraction anchor (thread matching), and can not deform, thereby effectively controlling the retraction amount of the anchor within 1 mm; when the wedge-shaped base plate 4 is stretched for the second time, the wedge-shaped base plate is pushed to be in place for the first time, and the operation is simple and convenient.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (7)
1. A low-retraction anchoring device for a wedge-shaped prestressed tendon is characterized in that: the anchor plate comprises a low-retraction anchor plate, a clamping piece, a wedge-shaped base plate, an anchor base plate and a spiral rib, wherein the wedge-shaped base plate is arranged between the low-retraction anchor plate and the anchor base plate.
2. The low-retraction anchor device for tendons as claimed in claim 1, wherein: at least one surface of the force bearing surface of the wedge-shaped base plate is an inclined surface, and the number of the wedge-shaped base plates is N.
3. The low-retraction anchor device for tendons as claimed in claim 1, wherein: the low-retraction anchoring device for the prestressed tendons further comprises the prestressed tendons, and the prestressed tendons penetrate through the low-retraction anchor plate, the wedge-shaped base plate, the anchor base plate and the spiral tendons at the lower end.
4. The low-retraction anchor device for tendons as claimed in claim 1, wherein: the clip is mounted with the low retraction anchor plate.
5. The low-retraction anchor device for tendons as claimed in claim 1, wherein: the low-retraction anchor plate is provided with a taper hole, the clamping piece is of a two-piece or multi-piece structure, and the two-piece or multi-piece structure is matched with the taper hole of the low-retraction anchor plate after being combined.
6. The low-retraction anchor device for tendons as claimed in claim 1, wherein: and single or a plurality of arranged taper holes are distributed on the low retraction anchor plate.
7. A low retraction anchor device for tendons according to any of claims 1 to 6, characterized in that: the low-retraction anchoring device for the prestressed tendons further comprises a corrugated pipe, wherein the corrugated pipe is located below the anchor backing plate, and the spiral tendons are wound on the corrugated pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922180518.9U CN211815509U (en) | 2019-12-09 | 2019-12-09 | Low-retraction anchoring device for wedge-shaped prestressed tendons |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922180518.9U CN211815509U (en) | 2019-12-09 | 2019-12-09 | Low-retraction anchoring device for wedge-shaped prestressed tendons |
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| CN211815509U true CN211815509U (en) | 2020-10-30 |
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| CN201922180518.9U Active CN211815509U (en) | 2019-12-09 | 2019-12-09 | Low-retraction anchoring device for wedge-shaped prestressed tendons |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404302A (en) * | 2021-06-28 | 2021-09-17 | 中国建筑第八工程局有限公司 | Tensioning device and tensioning method for carbon fiber prestressed rod piece |
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2019
- 2019-12-09 CN CN201922180518.9U patent/CN211815509U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404302A (en) * | 2021-06-28 | 2021-09-17 | 中国建筑第八工程局有限公司 | Tensioning device and tensioning method for carbon fiber prestressed rod piece |
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Address after: No.109, East 7th Road, Tianjin pilot free trade zone (Airport Economic Zone), Binhai New Area, Tianjin Patentee after: CHINA RAILWAY DESIGN Corp. Patentee after: Liuzhou qiaoxia Technology Development Co.,Ltd. Address before: No.109, East 7th Road, Tianjin pilot free trade zone (Airport Economic Zone), Binhai New Area, Tianjin Patentee before: CHINA RAILWAY DESIGN Corp. Patentee before: LIUZHOU CITY QIAOSHA ENGINEERING TUBE MATERIAL CO.,LTD. |