CN205206352U - Prestressing force steel strand stretching device of preventing back contracting - Google Patents
Prestressing force steel strand stretching device of preventing back contracting Download PDFInfo
- Publication number
- CN205206352U CN205206352U CN201521021995.6U CN201521021995U CN205206352U CN 205206352 U CN205206352 U CN 205206352U CN 201521021995 U CN201521021995 U CN 201521021995U CN 205206352 U CN205206352 U CN 205206352U
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- anchor
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- limiting plate
- retraction
- steel strand
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Abstract
The utility model discloses a prestressing force steel strand stretching device of preventing back contracting, including the work anchor instrument anchor terminal with locating steel strand wires of locating anchor cave department, the built -in work clamping piece that is equipped with of work anchor, the built -in instrument clamping piece that is equipped with of instrument anchor, be equipped with the jack that is used for applying the stretching force between work anchor and the instrument anchor, the jack is close to the limiting plate has been installed to the one end of work anchor, the shrinkage pool has been seted up corresponding to the region of work clamping piece to the limiting plate, being equipped with in the shrinkage pool and preventing back the board that contracts, steel strand wires are worn to locate in proper order in work anchor, the board of preventing back contracting, limiting plate, jack and the instrument anchor, prevent back contracting the board with be equipped with elastic element between the limiting plate, the utility model has the advantages of simple structure, reliable, convenient to use just can effectively reduce loss of prestress.
Description
Technical field
The utility model relates to prestress wire tensioning equipment, particularly relates to a kind of anti-retraction prestress wire tensioning equipment.
Background technology
The prefabricated post stretching of a large amount of employing (being called for short " post stretching ") Simply supported PC beam in Chinese Railway new line construction, and high-speed railway main track is afterward stretch box beam, accounts for total track length 80%.The prestressed correct foundation of afterward stretch box beam and damage control ability are the important guarantees of high ferro safe operation, real storage effective prestress is the first element of prestressed concrete railway bridge simply supported beam cracking resistance, and real storage effective prestress deducts loss of prestress by the prestressing force set up and obtains, one of key of therefore prestressed concrete railroad bridge production controls loss of prestress.In prestressed stretch-draw process, the retraction of steel strand can cause the prestressing force to precast beam applies to produce loss, and steel strand amount of recovery is larger, and loss of prestress is more.Therefore how to reduce the amount of recovery of steel strand, thus the loss of prestress reducing precast beam is the difficult problem faced in steel strand tension process.
Utility model content
The technical problems to be solved in the utility model overcomes the deficiencies in the prior art, provides a kind of structure simple, reliable, easy to use and effectively can reduce the anti-retraction prestress wire tensioning equipment of loss of prestress.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of anti-retraction prestress wire tensioning equipment, comprise the work anchor being located at anchor recess place and the moveable anchor being located at steel strand end, work clip sheet is equiped with in described work anchor, tool clamping piece is equiped with in described moveable anchor, the jack for applying stretching force is provided with between described work anchor and moveable anchor, described jack is equiped with limiting plate near one end of described work anchor, the region that described limiting plate corresponds to work clip sheet offers shrinkage pool, anti-retraction plate is provided with in described shrinkage pool, steel strand are arranged in described work anchor successively, anti-retraction plate, limiting plate, in jack and moveable anchor, flexible member is provided with between described anti-retraction plate and described limiting plate.
Further improvement as technique scheme:
The degree of depth of described shrinkage pool is D1, and the thickness of described limiting plate is D2, D1 < D2, and described flexible member one end abuts with the bottom of described shrinkage pool.
Described flexible member is spring.
Described limiting plate offers limited impression, and described work anchor is positioned in described limited impression.
Compared with prior art, the utility model has the advantage of: anti-retraction prestress wire tensioning equipment disclosed in the utility model, between jack and work anchor, limiting plate is set, the region that limiting plate corresponds to work clip sheet offers shrinkage pool, anti-retraction plate is provided with in shrinkage pool, flexible member is provided with between anti-retraction plate and limiting plate, structure is simple, reliably, when starting stretch-draw, work clip sheet is past work anchor movement outward along with the elongation of steel strand, continuous compression elastic element is started when work clip sheet contacts anti-retraction plate, when prestressing force is pulled to design stress, anti-retraction plate leans on the elastic force of flexible member by work clip sheet loopback work anchor, complete and hold the oil return of lotus rear pump or output pump, jack cylinder bounces back, now work clip sheet is locked by steel strand, fixing, the retraction of steel strand is effectively controlled, thus greatly reduce loss of prestress.
Further, limiting plate offers limited impression, be convenient to limiting plate and work anchor location fit, improve the stability in installation effectiveness and stretching process.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model anti-retraction prestress wire tensioning equipment original state.
Fig. 2 is the enlarged drawing at A place in Fig. 1.
Fig. 3 is the structural representation of the utility model anti-retraction prestress wire tensioning equipment end-state.
Fig. 4 is the enlarged drawing at B place in Fig. 3.
Fig. 5 is the fit structure schematic diagram of limiting plate in the utility model and anti-retraction plate.
Fig. 6 is the structural representation of the limiting plate in the utility model.
Fig. 7 is the structural representation of the anti-retraction plate in the utility model.
In figure, each label represents: 1, anchor recess; 2, work anchor; 21, work clip sheet; 3, steel strand; 4, moveable anchor; 41, tool clamping piece; 5, jack; 6, limiting plate; 61, shrinkage pool; 62, limited impression; 7, anti-retraction plate; 8, flexible member.
Detailed description of the invention
Below with reference to Figure of description and specific embodiment, the utility model is described in further details.
As shown in Figures 1 to 7, the anti-retraction prestress wire tensioning equipment of the present embodiment, comprise the work anchor 2 being located at anchor recess 1 place and the moveable anchor 4 being located at steel strand 3 end, work clip sheet 21 is equiped with in work anchor 2, tool clamping piece 41 is equiped with in moveable anchor 4, the jack 5 for applying stretching force is provided with between work anchor 2 and moveable anchor 4, jack 5 is equiped with limiting plate 6 near one end of work anchor 2, the region that limiting plate 6 corresponds to work clip sheet 21 offers shrinkage pool 61, anti-retraction plate 7 is provided with in shrinkage pool 61, steel strand 3 are arranged in work anchor 2 successively, anti-retraction plate 7, limiting plate 6, in jack 5 and moveable anchor 4, flexible member 8 is provided with between anti-retraction plate 7 and limiting plate 6.See Fig. 2, when starting stretch-draw, work clip sheet 21 is along with the elongation of steel strand 3 toward work anchor 2 outer mobile (namely moving toward steel strand 3 end), and along with the continuous movement of work clip sheet 21, anti-retraction plate 7 starts continuous compression elastic element 8; See Fig. 4, when prestressing force is pulled to design stress, anti-retraction plate 7 leans on the elastic force of flexible member 8 by work clip sheet 21 pushing tow, is recycled in work anchor 2, complete and hold the oil return of lotus rear pump or output pump, the oil cylinder retraction of jack 5, now work clip sheet 21 is by locked for steel strand 3, fixing, and the retraction of steel strand 3 is effectively controlled, thus greatly reduces loss of prestress.
In the present embodiment, flexible member 8 is spring, the degree of depth of shrinkage pool 61 is D1, the thickness of limiting plate 6 is D2, D1 < D2, flexible member 8 one end abuts with the bottom of shrinkage pool 61, in other embodiments, shrinkage pool 61 also can adopt through hole, and on inwall, arrange the support of positioning step realization to flexible member 8.
In the present embodiment, limiting plate 6 offers limited impression 62, work anchor 2 is positioned in limited impression 62, be convenient to limiting plate 6 and work anchor 2 location fit, improve the stability in installation effectiveness and stretching process, see Fig. 6 and Fig. 7, the shape of anti-retraction plate 7 and limiting plate 6 is circle.
The operating principle of anti-retraction prestress wire tensioning equipment of the present utility model: limiting plate 6 and anti-retraction plate 7 are installed on work anchor 2 end when carrying out prestressed stretch-draw, successively jack 5 is installed again, moveable anchor 4 and tool clamping piece 41, when starting stretch-draw, work clip sheet 21 is outer mobile toward work anchor 2 along with the elongation of steel strand 3, continuous Compress Spring is started when work clip sheet 21 contacts anti-retraction plate 7, when prestressing force is pulled to design stress, anti-retraction plate 7 leans on the elastic force of spring by work clip sheet 2 pushing tow, be recycled in work anchor 2, complete and hold the oil return of lotus rear pump or output pump, the oil cylinder retraction of jack 5, now work clip sheet 21 is by locked for steel strand 3, fixing, the retraction of steel strand 3 is effectively controlled, thus greatly reduce loss of prestress.
Although the utility model discloses as above with preferred embodiment, but and be not used to limit the utility model.Any those of ordinary skill in the art, when not departing from technical solutions of the utility model scope, the technology contents of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solutions of the utility model, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solutions of the utility model, according to the utility model technical spirit to any simple modification made for any of the above embodiments, equivalent variations and modification, all should drop in the scope of technical solutions of the utility model protection.
Claims (4)
1. an anti-retraction prestress wire tensioning equipment, comprise the work anchor (2) being located at anchor recess (1) place and the moveable anchor (4) being located at steel strand (3) end, work clip sheet (21) is equiped with in described work anchor (2), tool clamping piece (41) is equiped with in described moveable anchor (4), the jack (5) for applying stretching force is provided with between described work anchor (2) and moveable anchor (4), it is characterized in that: described jack (5) is equiped with limiting plate (6) near one end of described work anchor (2), described limiting plate (6) offers shrinkage pool (61) corresponding to the region of work clip sheet (21), anti-retraction plate (7) is provided with in described shrinkage pool (61), steel strand (3) are arranged in described work anchor (2) successively, anti-retraction plate (7), limiting plate (6), in jack (5) and moveable anchor (4), flexible member (8) is provided with between described anti-retraction plate (7) and described limiting plate (6).
2. anti-retraction prestress wire tensioning equipment according to claim 1, it is characterized in that: the degree of depth of described shrinkage pool (61) is D1, the thickness of described limiting plate (6) is D2, D1 < D2, described flexible member (8) one end abuts with the bottom of described shrinkage pool (61).
3. anti-retraction prestress wire tensioning equipment according to claim 2, is characterized in that: described flexible member (8) is spring.
4. anti-retraction prestress wire tensioning equipment according to any one of claim 1 to 3, it is characterized in that: described limiting plate (6) offers limited impression (62), described work anchor (2) is positioned in described limited impression (62).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521021995.6U CN205206352U (en) | 2015-12-10 | 2015-12-10 | Prestressing force steel strand stretching device of preventing back contracting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521021995.6U CN205206352U (en) | 2015-12-10 | 2015-12-10 | Prestressing force steel strand stretching device of preventing back contracting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205206352U true CN205206352U (en) | 2016-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521021995.6U Active CN205206352U (en) | 2015-12-10 | 2015-12-10 | Prestressing force steel strand stretching device of preventing back contracting |
Country Status (1)
| Country | Link |
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| CN (1) | CN205206352U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107825582A (en) * | 2017-10-29 | 2018-03-23 | 佛山路桥预制构件有限公司 | A kind of electromagnetic type limiter and its limit method for prestress engineering |
| CN109235272A (en) * | 2018-10-18 | 2019-01-18 | 江苏燕宁工程科技集团有限公司 | Anti-skidding stretch-draw jack |
| CN111173293A (en) * | 2019-12-31 | 2020-05-19 | 中建交通建设集团有限公司 | Manual reset type prestressed tendon low-retraction tensioning anchoring device and construction method |
-
2015
- 2015-12-10 CN CN201521021995.6U patent/CN205206352U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107825582A (en) * | 2017-10-29 | 2018-03-23 | 佛山路桥预制构件有限公司 | A kind of electromagnetic type limiter and its limit method for prestress engineering |
| CN107825582B (en) * | 2017-10-29 | 2019-06-04 | 佛山路桥预制构件有限公司 | A kind of electromagnetic type limiter and its limit method for prestress engineering |
| CN109235272A (en) * | 2018-10-18 | 2019-01-18 | 江苏燕宁工程科技集团有限公司 | Anti-skidding stretch-draw jack |
| CN111173293A (en) * | 2019-12-31 | 2020-05-19 | 中建交通建设集团有限公司 | Manual reset type prestressed tendon low-retraction tensioning anchoring device and construction method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |