CN101838971A - Construction method for carrying out external prestressing strengthening on bridge by transverse tensioning method - Google Patents
Construction method for carrying out external prestressing strengthening on bridge by transverse tensioning method Download PDFInfo
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- CN101838971A CN101838971A CN200910047666A CN200910047666A CN101838971A CN 101838971 A CN101838971 A CN 101838971A CN 200910047666 A CN200910047666 A CN 200910047666A CN 200910047666 A CN200910047666 A CN 200910047666A CN 101838971 A CN101838971 A CN 101838971A
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Abstract
The invention relates to a construction method for carrying out external prestressing strengthening on a bridge by a transverse tensioning method, which is mainly characterized in that both ends of the external drag line of parallel steel wires are fixed, a prestressing tensioning space needs not to be reserved, thus the drag line can be arranged at the two ends of a bridge structure as much as possible to obtain the best prestressing strengthening effect; by transversely tensioning the movable steel member of a steering block by utilizing a jack, the steel member slides along a direction vertical to the axis of a beam body to apply prestressing; and smaller equipment can be adopted to obtain the prestressing effect the same as that obtained by the traditional tensioning method, and the construction is more simple.
Description
Technical field
The present invention relates to a kind of worker's method of using transverse tensioning method to carry out the bridge external prestressing strengthening, particularly at using parallel wire stay to carry out the construction technology that the bridge external prestressing is reinforced.
Background technology
When adopting the external prestressing technology to carry out bridge strengthening, usually running into the difficult problem of a constructing operation, is exactly the stretch-draw space problem of drag-line.For the consolidation effect that obtains, when arranging drag-line, always wish the two ends of drag-line are arranged near the end of bridge as far as possible, so that make the whole beam of striding all be subjected to the prestressing force effect that brings by drag-line as much as possible.And reality often, and all there are bridge pier or abutment or continuous span in each two ends of striding bridge, and this just makes when stay cable end carries out stretching construction do not have enough spaces to be used to install tensioning equipment, makes tensioning construction to realize.Perhaps, just the stretch-draw end need be moved a certain distance toward span centre,, satisfy the needs in stretch-draw space to sacrifice prestressed consolidation effect in order to carry out stretch-draw at the simply supported beam beam-ends.Therefore need badly a kind of need not, easy construction effective in the stretch-draw of the two ends of drag-line, prestressed reinforcement apply the prestressing force new technology.
Summary of the invention
The objective of the invention is to overcome method for applying prestressing force in the existing external prestressing strengthening and have requirement stretch-draw space, drag-line two ends, sacrificed prestressed consolidation effect thus, the invention provides a kind of brand-new transverse tensioning method external prestressing strengthening construction technology, finely solved an above-mentioned difficult problem.
To achieve these goals, a kind of use transverse tensioning method of the present invention worker's method of carrying out the bridge external prestressing strengthening mainly comprises following construction sequence:
(1) according to the requirement of reinforcing design drawing, carry out the external drag-line of parallel steel wire, fixed end anchoring steel member, the batch production of the movable steel member of steering block anchoring steel member and steering block is made;
(2) is connected with steering block anchoring steel member according to the requirement of design drawing plantation fixed end anchoring steel member and use high-strength screw rod, install and fix end anchoring steel member and steering block anchoring steel member, also temporary fixed steering block activity steel member is installed; The movable steel member of steering block is prepared to promote;
(3) the movable steel member lifting of steering block is in place, and is temporarily fixed on the steering block anchoring steel member;
(4) the external drag-line of parallel steel wire is installed, by regulating the nut of two fixed end anchorings of the external drag-line of parallel steel wire steel member, with the external drag-line length adjustment of steel wire to designing requirement;
(5) remove the temporary fixed of the movable steel member of steering block, the external drag-line of steel wire is in place;
(6) stretch-draw reaction frame and stretch-draw jack are installed in the position under the movable steel work of steering block, prepare the external drag-line of steel wire is laterally applied prestressing force;
(7) start oil pump, jack tension, by the movable steel member of stretch-draw steering block, make the movable steel member of steering block along moving perpendicular to beam body axis direction, the external drag-line elongation of steel wire produces prestressing force, and transverse stretching stops stretch-draw to designing requirement Suo Li;
(8) placement is supported the steel pad and is tightened the perpendicular positioning nut, it is held out against support the steel pad, thereby keep the tensile state of the external drag-line of steel wire;
(9) jack oil return, the Suo Li of the external drag-line of steel wire passes to steering block anchoring steel member by the movable steel member of steering block, finally passes to bridge construction;
(10) remove jack and stretch-draw reaction frame, the external drag-line of steel wire two ends anchoring steel member is smeared anti-corrosive grease, and the protection block is installed, and the transverse tensioning method strengthening construction is finished.
Benefit of the present invention is by adopting transverse tensioning method to apply prestressing force, has overcome the needs of traditional method for applying prestressing force existence for the stretch-draw space, sacrifices the way of prestressed consolidation effect.The employing of transverse tensioning method can all be arranged to fixed end with the drag-line two ends, and as far as possible near the end of bridge construction, this method can obtain best prestressed reinforcement effect; By adopting the mode anchoring of parallel wire stay chill casting anchor and perpendicular positioning nut check, make this system minimum in the loss of prestress of pulling anchor cable stage; In addition, transverse tensioning method makes drag-line obtain the required stretching force of same prestressing force to significantly reduce than conventional method, and construction equipment is lighter and handier, and the flexible and convenient more of constructing is a kind of high efficiency construction.
Description of drawings
Fig. 1, transverse tensioning method construction schematic diagram
Fig. 2, step (2) construction state diagram
Fig. 3, step (3) construction state diagram
Fig. 4, step (5) construction state diagram
Fig. 5, step (6) construction state diagram
Fig. 6, step (7) construction state diagram
Fig. 7, step (8) construction state diagram
Fig. 8, step (9) construction state diagram
Fig. 9, step (10) construction state diagram
Concrete construction technology
Before introducing concrete construction technology, earlier the construction principle of transverse tensioning method is done individual briefly introducing, " transverse tensioning method " as its name suggests, is exactly the job practices of transverse stretching, and its construction principle as shown in Figure 1.The beam body is in no loading status during state A, and the beam body is subjected to load action during state B, produces amount of deflection; External tendon is fixed on beam body two ends during state C; During state D external tendon is carried out transverse stretching, make beam body amount of deflection reduce.This job practices is similar to " archery of drawing a bow ".When we carried out transverse stretching to prestressed cable, external tendon just produced pulling force, this with can obtain same effect by conventional method stretch-draw longitudinally.
Below worker's method of the present invention is further elaborated.Transverse tensioning method guy system of the present invention, form by fixed end, steering block and parallel wire stay three parts, wherein two of drag-line fixed end structures and traditional parallel wire stay is the same, the key technology that realizes transverse tensioning method is the structure of steering block, steering block is made up of steering block anchoring steel member 3 and the movable steel member 4 of steering block, wherein the movable steel member 4 of steering block can vertically move along the guide groove of steering block anchoring steel member 3, and can control the prestressed level that applies by the position of the movable steel member 4 of perpendicular positioning nut 7,8 adjusting steering blocks.
It is as follows that the present invention uses transverse tensioning method to carry out the step of bridge external prestressing strengthening:
(1), carries out the external drag- line 1,2 of parallel steel wire according to the requirement of reinforcing design drawing; The batch production of the movable steel member 4 of fixed end anchoring steel member, steering block anchoring steel member 3 and steering block is made;
(2) be connected with steering block anchoring steel member according to the requirement of design drawing plantation fixed end anchoring steel member and use high-strength screw rod; Install and fix end anchoring steel member and steering block anchoring steel member 3, install and the movable steel member 4 of temporary fixed steering block, the movable steel member 4 of steering block is prepared to promote;
(3) movable steel member 4 liftings of steering block are in place, and are temporarily fixed on the steering block anchoring steel member 3;
(4) the external drag- line 1,2 of steel wire is installed, promptly by fixed end anchoring steel work with the two ends of secured in parallel and the beam body of external prestressing to be performed respectively, the two ends of the external drag- line 1,2 of steel wire, and regulate external drag- line 1,2 length of steel wire to the preceding estimating position of stretch-draw;
(5) remove the temporary fixed of the movable steel member 4 of steering block, the external drag-line of steel wire is in place;
(6) stretch-draw reaction frame 5 and stretch-draw jack 6 are installed in the position under the movable steel work 4 of steering block, prepare the external drag- line 1,2 of steel wire is laterally applied prestressing force;
(7) start oil pump, jack 6 stretch-draw, by the movable steel member 4 of stretch-draw steering block, make the movable steel member 4 of steering block along moving perpendicular to beam body axis direction, external drag- line 1,2 elongations of steel wire produce prestressing force, transverse stretching stops stretch-draw to designing requirement Suo Li;
(8) placement is supported steel pad 9,10 and is tightened perpendicular positioning nut 7,8, it is held out against support steel pad 9,10, thereby keep the tensile state of the external drag- line 1,2 of steel wire;
(9) jack returns 6 oil, and the Suo Li of the external drag- line 1,2 of steel wire passes to steering block anchoring steel member 3 by the movable steel member 4 of steering block, finally passes to bridge construction;
(10) remove jack 6 and reaction frame 5; The fixed end ground tackle at the external drag-line of steel wire 1,2 two ends is smeared anti-corrosive grease, and the protection block is installed, and the transverse tensioning method strengthening construction is finished.
Claims (2)
1. worker's method of using transverse tensioning method to carry out the bridge external prestressing strengthening, it is characterized in that: described worker's method comprises following steps:
(1) according to the requirement of reinforcing design drawing, carry out the external drag-line of parallel steel wire, fixed end anchoring steel member, the batch production of the movable steel member of steering block anchoring steel member and steering block is made;
(2) is connected with steering block anchoring steel member according to the requirement of design drawing plantation fixed end anchoring steel member and use high-strength screw rod, install and fix end anchoring steel member and steering block anchoring steel member, also temporary fixed steering block activity steel member is installed; The movable steel member of steering block is prepared to promote;
(3) the movable steel member lifting of steering block is in place, and is temporarily fixed on the steering block anchoring steel member;
(4) the external drag-line of parallel steel wire is installed, by regulating the nut of two fixed end anchorings of the external drag-line of parallel steel wire steel member, with the external drag-line length adjustment of steel wire to designing requirement;
(5) remove the temporary fixed of the movable steel member of steering block, the external drag-line of steel wire is in place;
(6) stretch-draw reaction frame and stretch-draw jack are installed in the position under the movable steel work 4 of steering block, prepare the external drag-line of steel wire is laterally applied prestressing force;
(7) start oil pump, jack tension, by the movable steel member of stretch-draw steering block, make the movable steel member of steering block along moving perpendicular to beam body axis direction, the external drag-line elongation of steel wire produces prestressing force, and transverse stretching stops stretch-draw to designing requirement Suo Li;
(8) placement is supported the steel pad and is tightened the perpendicular positioning nut, it is held out against support the steel pad, thereby keep the tensile state of the external drag-line of steel wire;
(9) jack oil return, the Suo Li of the external drag-line of steel wire passes to steering block anchoring steel member by the movable steel member of steering block, finally passes to bridge construction;
(10) remove jack and stretch-draw reaction frame, the external drag-line of steel wire two ends anchoring steel member is smeared anti-corrosive grease, and the protection block is installed, and the transverse tensioning method strengthening construction is finished.
2. use transverse tensioning method according to claim 1 carries out worker's method of bridge external prestressing strengthening, its feature also is: fixed end all is arranged at step (2) and (3) parallel wire stay two ends, need not to reserve the prestressed stretch-draw space, thereby drag-line can be arranged in as far as possible the two ends of bridge construction, obtain the optimum prestress consolidation effect; Step (6) and (7) are by the movable steel member of jack transverse stretching steering block, make this member along sliding perpendicular to beam body axis direction, apply prestressing force, can adopt smaller and more exquisite equipment to obtain the same prestressing force effect of traditional stretching method, it is more lightly easy to construct.
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| CN2009100476661A CN101838971B (en) | 2009-03-17 | 2009-03-17 | Construction method for carrying out external prestressing strengthening on bridge by transverse tensioning method |
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| CN2009100476661A CN101838971B (en) | 2009-03-17 | 2009-03-17 | Construction method for carrying out external prestressing strengthening on bridge by transverse tensioning method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102587296A (en) * | 2012-02-21 | 2012-07-18 | 朔黄铁路发展有限责任公司 | Self-balancing external prestressing strengthening method for bridge structure |
| CN106381816A (en) * | 2016-09-08 | 2017-02-08 | 河北省高速公路青银管理处 | Repairing and processing method for corrosion expansion type breakage of bridge member reinforcing bars |
| CN106638334A (en) * | 2016-12-30 | 2017-05-10 | 河南省交通规划设计研究院股份有限公司 | Novel external prestressing strengthening device and construction method thereof |
| CN107571392A (en) * | 2017-09-27 | 2018-01-12 | 中建三局基础设施工程有限公司 | A kind of beam making bench for the construction of transverse tensioning method prestressing force prefabricated small box girder |
| CN110130234A (en) * | 2019-05-07 | 2019-08-16 | 东南大学 | A kind of novel bridge reinforcement system and its construction method |
| CN110761203A (en) * | 2018-07-25 | 2020-02-07 | 上海同济检测技术有限公司 | Pre-stressed tension-type reinforcing method for transverse connection of juxtaposed T-shaped beams |
| CN113047186A (en) * | 2021-03-24 | 2021-06-29 | 华东交通大学 | Bridge reinforcing apparatus |
| CN114892549A (en) * | 2022-05-24 | 2022-08-12 | 重庆达力索缆科技有限公司 | Expansion filling type external prestress CFRP material reinforcing system and construction method thereof |
Family Cites Families (5)
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| JP2003293323A (en) * | 2002-03-29 | 2003-10-15 | Topy Ind Ltd | Reinforcement structure of continuous girder bridge |
| CN1519433A (en) * | 2003-01-24 | 2004-08-11 | 深圳市海川实业股份有限公司 | Aramid fiber rope in engineering application for reinforcing external prestressing bridge |
| CN1740445A (en) * | 2005-09-23 | 2006-03-01 | 重庆交通学院 | External pre-stress reinforcing structure for common hollow reinforced concrete slab beam |
| CN201169752Y (en) * | 2007-12-20 | 2008-12-24 | 中铁大桥勘测设计院有限公司 | Steel structure anchoring steering system of external prestress for reinforcing old bridge |
| CN101215824B (en) * | 2008-01-07 | 2010-06-09 | 重庆交通大学 | External transverse tension prestressing force device for regulating and controlling large-span continuous steel bridge post deflection |
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2009
- 2009-03-17 CN CN2009100476661A patent/CN101838971B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587296B (en) * | 2012-02-21 | 2013-12-25 | 朔黄铁路发展有限责任公司 | Self-balancing external prestressing strengthening method for bridge structure |
| CN102587296A (en) * | 2012-02-21 | 2012-07-18 | 朔黄铁路发展有限责任公司 | Self-balancing external prestressing strengthening method for bridge structure |
| CN106381816B (en) * | 2016-09-08 | 2019-01-18 | 河北省高速公路青银管理处 | The repair process method of bridge member rebar corrosion class breakage |
| CN106381816A (en) * | 2016-09-08 | 2017-02-08 | 河北省高速公路青银管理处 | Repairing and processing method for corrosion expansion type breakage of bridge member reinforcing bars |
| CN106638334A (en) * | 2016-12-30 | 2017-05-10 | 河南省交通规划设计研究院股份有限公司 | Novel external prestressing strengthening device and construction method thereof |
| CN106638334B (en) * | 2016-12-30 | 2018-07-24 | 河南省交通规划设计研究院股份有限公司 | A kind of external prestressing strengthening device and its construction method |
| CN107571392A (en) * | 2017-09-27 | 2018-01-12 | 中建三局基础设施工程有限公司 | A kind of beam making bench for the construction of transverse tensioning method prestressing force prefabricated small box girder |
| CN110761203A (en) * | 2018-07-25 | 2020-02-07 | 上海同济检测技术有限公司 | Pre-stressed tension-type reinforcing method for transverse connection of juxtaposed T-shaped beams |
| CN110761203B (en) * | 2018-07-25 | 2021-10-01 | 上海同济检测技术有限公司 | Pre-stressed tension-type reinforcing method for transverse connection of juxtaposed T-shaped beams |
| CN110130234A (en) * | 2019-05-07 | 2019-08-16 | 东南大学 | A kind of novel bridge reinforcement system and its construction method |
| CN113047186A (en) * | 2021-03-24 | 2021-06-29 | 华东交通大学 | Bridge reinforcing apparatus |
| CN113047186B (en) * | 2021-03-24 | 2022-08-30 | 华东交通大学 | Bridge reinforcing apparatus |
| CN114892549A (en) * | 2022-05-24 | 2022-08-12 | 重庆达力索缆科技有限公司 | Expansion filling type external prestress CFRP material reinforcing system and construction method thereof |
| CN114892549B (en) * | 2022-05-24 | 2024-05-14 | 重庆达力索缆科技有限公司 | Expansion filling type external prestress CFRP material reinforcing system and construction method thereof |
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| CN101838971B (en) | 2012-05-23 |
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