CN102619171A - Loop bar connection type draw bar jack tension system - Google Patents
Loop bar connection type draw bar jack tension system Download PDFInfo
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- CN102619171A CN102619171A CN2012100906252A CN201210090625A CN102619171A CN 102619171 A CN102619171 A CN 102619171A CN 2012100906252 A CN2012100906252 A CN 2012100906252A CN 201210090625 A CN201210090625 A CN 201210090625A CN 102619171 A CN102619171 A CN 102619171A
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- loop bar
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Abstract
The invention relates to the technical field of engineering construction of bridges, in particular to a loop bar connection type draw bar jack tension system, which is suitable for a narrow and small tension space and a long stretching distance. The system comprises a cable strand anchor head, a fixed counter-force frame, a thin type center penetration jack, an anchoring nut, a steel anchor box and a draw bar device. According to the system, a set constant stretching boundary condition of the cable strand anchor head is formed by the steel anchor box, the fixed counter-force frame and a fixed wall surface at the rear end of the counter-force frame, and the cable strand anchor head can be stretched to a position required by a design only by controlling the jacking and stretching travel of the thin type center penetration jack, rotating a loop bar or a draw bar to adjust and shorten the length of the draw bar device and increasing or reducing the filling quantity of non-return cushion blocks; and the system is convenient to operate and has a simple structure and a good economic benefit, and low cost can be input.
Description
Technical field
The present invention relates to the bridge engineering technical field of construction, refer to a kind of loop bar connecting type pull rod jack tension system that is applicable to narrow stretch-draw space, long stretching distance particularly.
Background technology
Along with the development of Bridges in Our Country cause, large-scale anchor plate anchor system begins to be applied to the main rope of suspension bridge anchor structure.Strand anchor head and steel anchor box in the anchor plate system are separate, do not have an effect, steel anchor box and fixedly reaction frame, and fixedly the fixedly metope of reaction frame rear end form the strand anchor head stretch border condition that can't change of setting jointly; Fixedly reaction frame and fixedly the fixing wall face close of reaction frame rear end; Therefore the anchor plate systems face the outstanding problem of " narrow stretch-draw space, long stretching distance ", and the stroke of the jack in the common merogenesis spreading formula pull bar system generally has only 5cm, and the stretching distance of actual strand anchor head is often bigger; So after a jack range; Need the space that strand anchor head and steel anchor box spare be filled with cushion block, prevent that the strand anchor head from resetting (because Shu Li is still very big), after cushion block is filled in; Loosen jack again; The strand anchor head just can not reset because of the Shu Li of an other end, and in such cases, the pull bar space is just because of the mobile and corresponding minimizing in steel anchor box of strand anchor head; Promptly pull bar needs constantly outside steel anchor box, to move in stretching process, realizes that pull bar moves back bar.This just requires the steel anchor box outside to have the bigger bar space of moving back.Under the narrow and small construction environment in space, be difficult to guarantee that pull bar moves back the stretch-draw space that bar needs, this condition restriction the application of anchor plate system in the bridge cause.
Summary of the invention
The object of the invention is exactly the deficiency to the above-mentioned background technical description; Design the construction requirement that a kind of long distance that can satisfy the main cable strand end stretches; Need not again in narrow and small stretch-draw space, to move back bar, do not receive the loop bar connecting type pull rod jack tension system of the restriction in stretch-draw space.
Technical scheme of the present invention is: a kind of loop bar connecting type pull rod jack tension system, comprise strand anchor head, fixedly reaction frame, punching jack, anchoring nut and steel anchor box, and said strand anchor head is located in the steel anchor box; Described anchoring nut is arranged on the top of punching jack and lifts on the part, and the punching jack is located at fixedly on the reaction frame, and fixedly reaction frame fixedly is located on steel anchor box; It is characterized in that: also comprise draw rod device; Said draw rod device comprises at least two pull bars, is connected by loop bar between the pull bar, and loop bar is a hollow structure; One end of draw rod device is connected with strand anchor head one end, and the other end of draw rod device and anchoring nut are through being threaded.
Further, the other end of said strand anchor head is connected with strand.
Further, said strand anchor head and strand link are provided with cushion block.
Preferably, the threaded one end of said strand anchor head is connected with connector, and connector is connected with draw rod device through internal thread.
Preferably, be threaded between said loop bar and the pull bar.
The method for stretching of a kind of loop bar connecting type pull rod jack tension system, it is that strand is connected with the strand anchor head other end, after a pull bar in the punching jack clamping draw rod device is implemented stretch-draw one segment distance; Be provided with the cushion block of stopping at strand anchor head and strand link; Rotation loop bar or pull bar are regulated the length that shortens draw rod device, unclamp the punching jack, after the punching jack resets; After again a pull bar in the punching jack clamping draw rod device being implemented stretch-draw one segment distance; Be provided with the cushion block of stopping at strand anchor head and strand link, rotation loop bar or pull bar are regulated the length that shortens draw rod device, unclamp the punching jack; After the punching jack resetted, the above-mentioned jack tension that circulates once more resetted until strand stretch-draw is put in place.
Further, each stretch-draw distance of said punching jack is a stroke of punching jack.
Among the present invention, can need stretching distance, regulate the hollow length in the loop bar, perhaps the quantity of increase/minimizing loop bar and pull bar according to the strand anchor head at steel anchor box.
Steel anchor box among the present invention and fixedly reaction frame, and fixedly the fixedly metope of reaction frame rear end form the strand anchor head stretch border condition that can't change of setting jointly; Stretch the filling quantity that stroke, rotation loop bar or pull bar are regulated the length and the increase of shortening draw rod device or reduced the stopping cushion block through controlling slim punching jack top; Can make the strand anchor head be stretched to the design position, easy to operate, simple in structure; Cost input that can be lower obtains good economic benefit.
Description of drawings
Fig. 1 is an original state structural representation of the present invention.
Fig. 2 is a working state schematic representation of the present invention.
Among the figure: 1-strand anchor head, the 2-connector, the solid pull bar of 3-, the 4-hollow draw-bar, the solid pull bar of 5-, the 6-hollow draw-bar, the solid pull bar of 7-, 8-is reaction frame fixedly, the conventional slim punching jack of 9-, 10-anchoring nut, 11-steel anchor box, 12-backing plate.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further detailed description, be convenient to be well understood to the present invention, but they do not constitute qualification to the present invention.
As shown in Figure 1 a kind of loop bar connecting type pull rod jack tension system comprises strand anchor head 1, connector 2, fixedly reaction frame 8, slim punching jack 9, anchoring nut 10, steel anchor box 11 and draw rod device.Strand anchor head 1 is relatively independent structure with steel anchor box 11; Can in steel anchor box 11, vertically move, be anchored under its original state on the termination plate washer of steel anchor box 11, and be connected with strand; Connector 2 is connected with the two ends of strand anchor head 1 through external screw thread; Connector 2 is connected with draw rod device through internal thread, and draw rod device is made up of solid pull bar 3, solid pull bar 5, solid pull bar 7, hollow draw-bar 4, hollow draw-bar 6, and hollow draw-bar 4 and hollow draw-bar 6 in the present embodiment are exactly the loop bar in the technical scheme of the present invention; One end of solid pull bar 3 and connector 2 are through being threaded; The other end of solid pull bar 3 is connected with hollow draw-bar 4 through screw thread with an end of solid pull bar 5, and the other end of solid pull bar 5 is connected through hollow draw-bar 6 with an end of hollow draw-bar 7, and the inside of hollow draw-bar 4 and hollow draw-bar 6 is provided with the hollow distance that length is L; The other end of hollow draw-bar 7 is connected with anchoring nut 10 through screw thread; Anchoring nut 10 is arranged on the top of slim punching jack 9 and lifts on the part, and slim punching jack 9 is located at fixedly reaction frame 8 rear ends, and fixedly reaction frame 8 is fixedly installed on the steel anchor box 11.
Concrete operating principle is: install each member by Fig. 1; Form the original state of strand anchor head 1 tension strand; Then; Start slim punching jack 9, move, move to range until slim punching jack 9 by the anchoring nut that is provided with on the slim punching jack 9 10 drive draw rod device and strand anchor head 1; Top and 1 of strand anchor head at steel anchor box 11 inserts backing plate 12 subsequently.Slim subsequently punching jack 9 oil returns, draw rod device is lax.Turn the pull bar in the draw rod device, make the hollow distance shrinkage of hollow draw-bar 4 and hollow draw-bar 7 inside, promptly shortened the length of draw rod device; Draw rod device is recovered tensioning state, can realize the continuation stretch-draw of slim punching jack; Start slim punching jack 9 once more, get into next jack top and stretch stroke, repeat aforesaid operations, until strand anchor head 1 is stretched to design attitude, to accomplish the stretch function of strand anchor head 1, concrete effect is as shown in Figure 2.This draw rod device can be under the situation of not adjusting pull bar quantity, stretching strand anchor head 2L
0Distance.
In addition,, can suitably regulate the inner hollow distance of hollow draw-bar, increase the stretching demand that the pull bar quantity that perhaps reduces in the draw rod device satisfies strand anchor head 1 according to the stretching distance of strand anchor head 1 at steel anchor box 11.
Claims (7)
1. loop bar connecting type pull rod jack tension system; Comprise strand anchor head (1), fixedly reaction frame (8), punching jack (9), anchoring nut (10) and steel anchor box (11), said strand anchor head (1) is located in the steel anchor box (11), and described anchoring nut (10) is arranged on the top of punching jack (9) and lifts on the part; Punching jack (9) is located at fixedly on the reaction frame (8); Fixedly reaction frame (8) fixedly is located on steel anchor box (11), it is characterized in that: also comprise draw rod device, said draw rod device comprises at least two pull bars; Connect by loop bar between the pull bar; Loop bar is a hollow structure, and an end of draw rod device is connected with strand anchor head (1) one end, and the other end of draw rod device and anchoring nut (10) are through being threaded.
2. loop bar connecting type pull rod jack tension according to claim 1 system, it is characterized in that: strand anchor head (1) other end is connected with strand.
3. a kind of loop bar connecting type pull rod jack tension according to claim 1 and 2 system, it is characterized in that: strand anchor head (1) is provided with cushion block with the link of strand.
4. loop bar connecting type pull rod jack tension according to claim 1 system, it is characterized in that: the threaded one end of said strand anchor head (1) is connected with connector (2), and connector (2) is connected with draw rod device through internal thread.
5. loop bar connecting type pull rod jack tension according to claim 1 system is characterized in that: be threaded between loop bar and the pull bar.
6. method for stretching based on the said loop bar connecting type pull rod of claim 1 jack tension system; It is that strand is connected with strand anchor head (1) other end; After pull bar in punching jack (9) the clamping draw rod device is implemented stretch-draw one segment distance, be provided with the cushion block of stopping at the strand anchor head (1) and the link of strand, rotation loop bar or pull bar are regulated the length that shortens draw rod device; Unclamp punching jack (9), after punching jack (9) resets; After again a pull bar in punching jack (9) the clamping draw rod device being implemented stretch-draw one segment distance; Be provided with the cushion block of stopping at strand anchor head (1) and strand link; Rotation loop bar or pull bar are regulated the length that shortens draw rod device; Unclamp punching jack (9), after punching jack (9) resetted, the above-mentioned jack tension that circulates once more resetted until strand stretch-draw is put in place.
7. method for stretching according to claim 6 is characterized in that each stretch-draw distance of punching jack (9) is a stroke of punching jack (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210090625.2A CN102619171B (en) | 2012-03-30 | 2012-03-30 | Loop bar connection type draw bar jack tension system and tension method therof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210090625.2A CN102619171B (en) | 2012-03-30 | 2012-03-30 | Loop bar connection type draw bar jack tension system and tension method therof |
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| CN102619171A true CN102619171A (en) | 2012-08-01 |
| CN102619171B CN102619171B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210090625.2A Active CN102619171B (en) | 2012-03-30 | 2012-03-30 | Loop bar connection type draw bar jack tension system and tension method therof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108570922A (en) * | 2018-06-12 | 2018-09-25 | 中交第四航务工程勘察设计院有限公司 | A kind of multi beam connects few beam prestressed strand spreading structure and construction method |
| CN110644366A (en) * | 2019-09-06 | 2020-01-03 | 中铁大桥(郑州)缆索有限公司 | Stay cable tensioning device for narrow anchoring space and operation method thereof |
| CN111139795A (en) * | 2020-01-10 | 2020-05-12 | 广东江海机电工程有限公司 | Adjusting device and adjusting method for stretching of prestressed pull rod |
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| US20080245004A1 (en) * | 2007-04-06 | 2008-10-09 | Pryor Steven E | Automatic take-up device and in-line coupler |
| CN101509302A (en) * | 2009-03-18 | 2009-08-19 | 北京市建筑工程研究院 | Single steel strand stay plant and assembling method thereof |
| CN201581643U (en) * | 2009-10-10 | 2010-09-15 | 安徽鲁班建设投资集团有限公司 | Built-in tensioning device |
| CN201874246U (en) * | 2010-09-26 | 2011-06-22 | 北京华泰天成科技发展有限公司 | Prestressed tendon tensioning device |
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2012
- 2012-03-30 CN CN201210090625.2A patent/CN102619171B/en active Active
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| US20080245004A1 (en) * | 2007-04-06 | 2008-10-09 | Pryor Steven E | Automatic take-up device and in-line coupler |
| CN101509302A (en) * | 2009-03-18 | 2009-08-19 | 北京市建筑工程研究院 | Single steel strand stay plant and assembling method thereof |
| CN201581643U (en) * | 2009-10-10 | 2010-09-15 | 安徽鲁班建设投资集团有限公司 | Built-in tensioning device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108570922A (en) * | 2018-06-12 | 2018-09-25 | 中交第四航务工程勘察设计院有限公司 | A kind of multi beam connects few beam prestressed strand spreading structure and construction method |
| CN108570922B (en) * | 2018-06-12 | 2023-12-05 | 中交第四航务工程勘察设计院有限公司 | Multi-beam-connection few-beam prestressed steel beam lengthening structure and construction method |
| CN110644366A (en) * | 2019-09-06 | 2020-01-03 | 中铁大桥(郑州)缆索有限公司 | Stay cable tensioning device for narrow anchoring space and operation method thereof |
| CN111139795A (en) * | 2020-01-10 | 2020-05-12 | 广东江海机电工程有限公司 | Adjusting device and adjusting method for stretching of prestressed pull rod |
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| Publication number | Publication date |
|---|---|
| CN102619171B (en) | 2014-03-12 |
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