CN105507169A - Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method - Google Patents
Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method Download PDFInfo
- Publication number
- CN105507169A CN105507169A CN201610028018.1A CN201610028018A CN105507169A CN 105507169 A CN105507169 A CN 105507169A CN 201610028018 A CN201610028018 A CN 201610028018A CN 105507169 A CN105507169 A CN 105507169A
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- stretch
- draw
- frp cloth
- cloth
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a tensioning and anchoring device and a reinforcing method, in particular to a tensioning and anchoring device for reinforcing a reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and a reinforcing method. The device aims to solve the problems that due to an existing method of reinforcing the bridge by pasting the FRP cloth, the stress level of the FRP cloth is reduced, the advantage of high strength can not be given into full play effectively, and the reinforcing effect of the bridge is poor. The device comprises the FRP cloth, a prestress tensioning pedestal, two tensioning assemblies, two triangular supports, two anchoring assemblies and two steel rollers. The two triangular supports are arranged on the upper surface of the prestress tensioning pedestal side by side. One steel roller is installed at the upper end of each triangular support. One tensioning assembly is arranged at the lower end of each triangular support. The two ends of the FRP cloth are connected with the two anchoring assemblies respectively. Each anchoring assembly is wound around one steel roller and connected with one corresponding tensioning assembly. The device belongs to the field of bridge building.
Description
Technical field
The present invention relates to a kind of stretch-draw anchor and determine device and reinforcement means, the stretch-draw anchor being specifically related to a kind of pre-stress FRP cloth Strengthened RC Bridge determines device and reinforcement means, belongs to construction of road and bridge field.
Background technology
Reinforced Concrete Bridge can cause the deficiency of using function and ultimate bearing capacity usually due to following reason, these factors comprise: the birth defect the first, in design; The second, the increase of service load; Three, because collision and the supporting capacity of corroding the structural damage that causes and causing reduce.In order to keep the normal use of the bridge construction of these functional deteriorations, need to reinforce to improve its functional performance to this kind of bridge construction.
Fiber-reinforced resin matrix compound material FRP has the advantage that proportion is little, intensity is high, corrosion-resistant, geometry is easy to making, becomes a kind of desirable bridge strengthening material, obtains research and engineer applied widely in recent years in bridge strengthening.Pasting FRP cloth is a kind of bridge strengthening mode the most often used, is a kind of passive enforcement mode owing to pasting FRP cloth, and the strain increment that the mobile loads such as automobile produce is limited, at failure stage, the stress level of FRP cloth reduces, and therefore effectively can not play the high advantage of FRP intensity, consolidation effect is general.
For this reason, developing a kind of pre-stress FRP cloth active enforcement technology is improve the effective means of FRP cloth consolidation effect, namely before stickup, a set of tensioning equipment is adopted to carry out stretch-draw to FRP cloth, make it to paste under high-stress state, to be pasted complete after to put, thus to reinforcement body Shi Hanzhang, and then greatly improve bridge anti-bending bearing capacity consolidation effect.Experimental study is verified, not only can improve flexural strength, and can improve shear strength by the bottom level stretch-draw FRP cloth at bridge.Pre-stress FRP cloth also improves the functional performance of beam simultaneously, under service load effect, reduces the distortion of crack width and beam, and is delayed the generation that girder bends surrender.And the key realizing this reinforcing technique is a set of FRP cloth stretching and anchoring device that can be applied to Practical Project.
Summary of the invention
The present invention solves existing stickup FRP cloth reinforcement bridge method to cause the stress level of FRP cloth to reduce, effectively can not play the high advantage of its intensity, cause the problem that bridge strengthening effect is poor, and then the stretch-draw anchor proposing a kind of pre-stress FRP cloth Strengthened RC Bridge determines device and reinforcement means.
The present invention is the technical scheme taked that solves the problem: device of the present invention comprises FRP cloth, prestressed stretch-draw pedestal, two stretch-draw assemblies, two A-frames, two anchoring assemblies and two steel roller bearings, two A-frames are disposed side by side on the upper surface of prestressed stretch-draw pedestal, the upper end of each A-frame installs a steel roller bearing respectively, the lower end of each A-frame arranges a described stretch-draw assembly respectively, the two ends of FRP cloth are connected with two described anchoring assemblies respectively, each described anchoring assembly is walked around a steel roller bearing respectively and is connected with corresponding described stretch-draw assembly.
The concrete steps of the method for the invention are as follows:
Step one, in FRP cloth pre-epoxy resin dipping, the termination of FRP cloth good for preimpregnation is wrapped on square hollow beam, after epoxy resin cure, two square hollow beams is linked together composition anchoring assembly by set bolt;
Step 2, anchoring assembly are walked around the steel roller bearing of A-frame upper end and are connected with the second threaded anchor rod of the stretch-draw assembly of A-frame lower end;
Step 3, between the soffit and scaffold of prestressed stretch-draw pedestal, be arranged side by side two jack;
Step 4, startup stretch-draw assembly, by after FRP cloth stretch-draw to the stress level required, smear epoxide-resin glue at FRP cloth upper surface and reinforced concrete beam soffit;
Prestressed stretch-draw pedestal rises by step 5, startup two jack, and FRP cloth and reinforced concrete beam are fitted;
Step 6, with syringe or syringe needle to FRP cloth and reinforced concrete beam joint place Epoxy Resin For Automatic Pressure Gelation Process to remove the bubble in laminating layer;
After step 7, epoxy resin cure, two jack are removed, from steel roller bearing, unnecessary FRP cloth is wiped out, complete reinforcing.
The invention has the beneficial effects as follows: 1, the present invention can complete the stretch-draw of FRP cloth effectively, realizes the reinforcing object of pre-stress FRP cloth.2, effectively play the high advantage of FRP cloth intensity, improve bridge strengthening effect; 3, the present invention is simple and efficient to handle, can effectively improve bridge strengthening efficiency.
Accompanying drawing explanation
Fig. 1 is job site of the present invention application schematic diagram, and Fig. 2 is the structural representation of anchoring assembly, and Fig. 3 is the structural representation of pretensioniog bed, and Fig. 4 is the structural representation of stretch-draw assembly.
Detailed description of the invention
Detailed description of the invention one: composition graphs 1 to Fig. 4 illustrates present embodiment, a kind of stretch-draw anchor of pre-stress FRP cloth Strengthened RC Bridge described in present embodiment is determined device and is comprised FRP cloth 1, prestressed stretch-draw pedestal 2, two stretch-draw assemblies, two A-frames 3, two anchoring assemblies and two steel roller bearings 4, two A-frames 3 are disposed side by side on the upper surface of prestressed stretch-draw pedestal 2, the upper end of each A-frame 3 installs a steel roller bearing 4 respectively, the lower end of each A-frame 3 arranges a described stretch-draw assembly respectively, the two ends of FRP cloth 1 are connected with two described anchoring assemblies respectively, each described anchoring assembly is walked around a steel roller bearing 4 respectively and is connected with corresponding described stretch-draw assembly.
Detailed description of the invention two: composition graphs 2 illustrates present embodiment, the each described anchoring assembly that a kind of stretch-draw anchor of pre-stress FRP cloth Strengthened RC Bridge described in present embodiment determines device is made up of two square hollow beams 5 and two set bolts 6, and two square hollow beams 5 are connected by two set bolts 6.The termination of FRP cloth 1 is wrapped on square hollow beam 5, and at least will reach two-layer winding.Two square hollow beams 5 make FRP cloth just in time between two square hollow beams 5 after combining and fixing, and contribute to like this preventing FRP cloth 1 from throwing off, guarantee effectively to apply axial prestress load.Other composition and annexation identical with detailed description of the invention one.
Detailed description of the invention three: composition graphs 3 and Fig. 4 illustrate present embodiment, described in present embodiment, a kind of stretch-draw anchor of pre-stress FRP cloth Strengthened RC Bridge determines device, it is characterized in that: each described stretch-draw assembly comprises the first reaction frame 7, second reaction frame 8, hydraulic jack 9, pressure sensor 10, steel plate 11, reaction beam 12, multiple first threaded anchor rod 13 and multiple second threaded anchor rod 14, first reaction frame 7, hydraulic jack 9, pressure sensor 10, second reaction frame 8, steel plate 11, reaction beam 12 from top to bottom sets gradually, the upper end of hydraulic jack 9 is connected with the soffit of the first reaction frame 7, the lower end of hydraulic jack 9 is connected with the second reaction frame 8 by pressure sensor 10, and each first threaded anchor rod 13 is from the bottom to top successively through reaction beam 12, steel plate 11 is connected with the first reaction frame 7, and each second threaded anchor rod 14 is from the bottom to top successively through reaction beam 12, steel plate 11, second reaction frame 8, first reaction frame 7 is connected with described anchoring assembly.
Reaction beam 12 in present embodiment uses the riveted joint of steel plate, peg or bolt together, upper surface in the end of reaction beam 12 respectively welds the steel plate that a piece meets thickness requirement, be used for fixing the A-frame 3 of supporting steel roller bearing, by adjusting the position of the first reaction frame 7 and the second reaction frame 8, to meet the range demands of hydraulic jack 9, by hydraulic jack 9 reinforcing to be applied to the stress distribution of needs, when meeting the requirements of stress level, screw all nuts, keep stress level to stablize constant.Other composition and annexation identical with detailed description of the invention one.
Detailed description of the invention four: composition graphs 1 illustrates present embodiment, described in present embodiment, a kind of method of pre-stress FRP cloth Strengthened RC Bridge realizes as follows:
Step one, in FRP cloth 1 pre-epoxy resin dipping, the termination of FRP cloth 1 good for preimpregnation is wrapped on square hollow beam 5, after epoxy resin cure, two square hollow beams 5 is linked together composition anchoring assembly by set bolt 6;
Step 2, anchoring assembly are walked around the steel roller bearing 4 of A-frame 3 upper end and are connected with the second threaded anchor rod 14 of the stretch-draw assembly of A-frame 3 lower end;
Step 3, between the soffit and scaffold 15 of prestressed stretch-draw pedestal 2, be arranged side by side two jack 16;
Step 4, startup stretch-draw assembly, by after FRP cloth 1 stretch-draw to the stress level required, smear epoxide-resin glue at FRP cloth 1 upper surface and reinforced concrete beam 17 soffit;
Prestressed stretch-draw pedestal 2 rises by step 5, startup two jack 16, and FRP cloth 1 and reinforced concrete beam 17 are fitted;
Step 6, with syringe or syringe needle to FRP cloth 1 with reinforced concrete beam 17 joint place Epoxy Resin For Automatic Pressure Gelation Process to remove the bubble in laminating layer;
After step 7, epoxy resin cure, two jack 16 are removed, from steel roller bearing 4, unnecessary FRP cloth 1 is wiped out, complete reinforcing.
Stretching process of the present invention is: after assembling completes stretch-draw assembly, after Height Adjustment is suitable, screw all nuts, keep the first reaction frame above hydraulic jack motionless all the time, afterburning by hydraulic jack, the second reaction frame below pressure sensor is moved down, drives hollow anchoring beam to move down simultaneously, reach the object of stretch-draw FRP cloth, the reading of record pressure sensor, after reaching tonnage, at once screw the nut below reaction beam, constant to keep stress level to stablize.Still tension tonnage is not met the requirements of when hydraulic jack arrives range, now, first reaction beam bottom nut is screwed equally, constant to keep current stress level to stablize, jack oil return afterwards, nut afterwards upwards below turn second reaction frame, lifting reaction frame and jack assembly, carry out the reset of hydraulic jack, tightening nut after completing, again carry out stretch-draw FRP cloth by hydraulic jack reinforcing, as mentioned above, until tension tonnage reaches requirement, screw reaction beam bottom nut, complete stretch-draw.
Taping process of the present invention is: it is completed by two jack being placed on reaction beam bottom that the jacking of whole prestressing force cloth is pasted, and reaction beam is supported on scaffold.After FRP cloth is by stretch-draw to the stress level required, epoxide-resin glue smeared by cloth and concrete surface, whole stretching bed seat, by hydraulic jack jack-up, is fitted to make FRP cloth and concrete surface.With syringe or needle injection epoxy resin to remove the bubble in laminating layer.After epoxy resin cure, remove jack, loosen threaded anchor rod, prestressing force is just delivered on beam.Cut off unnecessary FRP cloth from roller bearing, this part unnecessary non-prestressed cloth can be pasted onto on beam with epoxy resin.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to technical spirit of the present invention, within the spirit and principles in the present invention, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection domain all still belonging to technical solution of the present invention.
Claims (4)
1. the stretch-draw anchor of a pre-stress FRP cloth Strengthened RC Bridge determines device, it is characterized in that: the stretch-draw anchor of described a kind of pre-stress FRP cloth Strengthened RC Bridge is determined device and comprised FRP cloth (1), prestressed stretch-draw pedestal (2), two stretch-draw assemblies, two A-frames (3), two anchoring assemblies and two steel roller bearings (4), two A-frames (3) are disposed side by side on the upper surface of prestressed stretch-draw pedestal (2), the upper end of each A-frame (3) installs a steel roller bearing (4) respectively, the lower end of each A-frame (3) arranges a described stretch-draw assembly respectively, the two ends of FRP cloth (1) are connected with two described anchoring assemblies respectively, each described anchoring assembly is walked around a steel roller bearing (4) respectively and is connected with corresponding described stretch-draw assembly.
2. a kind of stretch-draw anchor of pre-stress FRP cloth Strengthened RC Bridge determines device according to claim 1, it is characterized in that: each described anchoring assembly is made up of two square hollow beams (5) and two set bolts (6), two square hollow beams (5) are connected by two set bolts (6).
3. a kind of stretch-draw anchor of pre-stress FRP cloth Strengthened RC Bridge determines device according to claim 1, it is characterized in that: each described stretch-draw assembly comprises the first reaction frame (7), second reaction frame (8), hydraulic jack (9), pressure sensor (10), steel plate (11), reaction beam (12), multiple first threaded anchor rod (13) and multiple second threaded anchor rod (14), the first reaction frame (7), hydraulic jack (9), pressure sensor (10), second reaction frame (8), steel plate (11), reaction beam (12) from top to bottom sets gradually, the upper end of hydraulic jack (9) is connected with the soffit of the first reaction frame (7), the lower end of hydraulic jack (9) is connected with the second reaction frame (8) by pressure sensor (10), and each first threaded anchor rod (13) is from the bottom to top successively through reaction beam (12), steel plate (11) is connected with the first reaction frame (7), and each second threaded anchor rod (14) is from the bottom to top successively through reaction beam (12), steel plate (11), second reaction frame (8), first reaction frame (7) is connected with described anchoring assembly.
4. utilize a method for fastening devices Strengthened RC Bridge described in claim 1, it is characterized in that: the method for described a kind of pre-stress FRP cloth Strengthened RC Bridge realizes as follows:
Step one, at the upper pre-epoxy resin dipping of FRP cloth (1), the termination of FRP cloth (1) good for preimpregnation is wrapped on square hollow beam (5), after epoxy resin cure, two square hollow beams (5) is linked together composition anchoring assembly by set bolt (6);
Second threaded anchor rod (14) of steel roller bearing (4) and the stretch-draw assembly of A-frame (3) lower end that step 2, anchoring assembly walk around A-frame (3) upper end is connected;
Step 3, between the soffit and scaffold (15) of prestressed stretch-draw pedestal (2), be arranged side by side two jack (16);
Step 4, startup stretch-draw assembly, by after FRP cloth (1) stretch-draw to the stress level required, smear epoxide-resin glue at FRP cloth (1) upper surface and reinforced concrete beam (17) soffit;
Prestressed stretch-draw pedestal (2) rises by step 5, startup two jack (16), and FRP cloth (1) and reinforced concrete beam (17) are fitted;
Step 6, with syringe or syringe needle to FRP cloth (1) with reinforced concrete beam (17) joint place Epoxy Resin For Automatic Pressure Gelation Process to remove the bubble in laminating layer;
After step 7, epoxy resin cure, two jack (16) are removed, from steel roller bearing (4), unnecessary FRP cloth (1) is wiped out, complete reinforcing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610028018.1A CN105507169B (en) | 2016-01-16 | 2016-01-16 | Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610028018.1A CN105507169B (en) | 2016-01-16 | 2016-01-16 | Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method |
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| CN105507169A true CN105507169A (en) | 2016-04-20 |
| CN105507169B CN105507169B (en) | 2017-05-24 |
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| CN201610028018.1A Active CN105507169B (en) | 2016-01-16 | 2016-01-16 | Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522114A (en) * | 2016-10-28 | 2017-03-22 | 同济大学 | Concrete structure prestress reinforcing device adopting CFRP cloth |
| CN106544962A (en) * | 2016-10-28 | 2017-03-29 | 同济大学 | The prestress reinforced construction method of xoncrete structure |
| CN109025353A (en) * | 2018-08-26 | 2018-12-18 | 大连理工大学 | A kind of device and construction method of pre-stress FRP sheet material reinforcement of rc beam |
| CN113927728A (en) * | 2021-11-29 | 2022-01-14 | 郑州大学综合设计研究院有限公司 | Novel prestressed concrete mixed reinforcement pipe pile manufacturing device and method |
| CN114892548A (en) * | 2022-05-24 | 2022-08-12 | 重庆达力索缆科技有限公司 | Downward-pressing type external prestress CFRP material reinforcing system and construction method thereof |
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| CN104264998A (en) * | 2014-10-20 | 2015-01-07 | 沈阳建筑大学 | Self-anchored pre-stress tension machine for quantitative FRP control |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522114A (en) * | 2016-10-28 | 2017-03-22 | 同济大学 | Concrete structure prestress reinforcing device adopting CFRP cloth |
| CN106544962A (en) * | 2016-10-28 | 2017-03-29 | 同济大学 | The prestress reinforced construction method of xoncrete structure |
| CN106544962B (en) * | 2016-10-28 | 2018-07-03 | 同济大学 | The prestress reinforced construction method of concrete structure |
| CN106522114B (en) * | 2016-10-28 | 2018-08-28 | 同济大学 | The prestressed reinforcement device of concrete structure is carried out using CFRP cloth materials |
| CN109025353A (en) * | 2018-08-26 | 2018-12-18 | 大连理工大学 | A kind of device and construction method of pre-stress FRP sheet material reinforcement of rc beam |
| CN113927728A (en) * | 2021-11-29 | 2022-01-14 | 郑州大学综合设计研究院有限公司 | Novel prestressed concrete mixed reinforcement pipe pile manufacturing device and method |
| CN113927728B (en) * | 2021-11-29 | 2023-01-24 | 郑州大学综合设计研究院有限公司 | Novel prestressed concrete mixed reinforcement pipe pile manufacturing device and method |
| CN114892548A (en) * | 2022-05-24 | 2022-08-12 | 重庆达力索缆科技有限公司 | Downward-pressing type external prestress CFRP material reinforcing system and construction method thereof |
| CN114892548B (en) * | 2022-05-24 | 2024-05-14 | 重庆达力索缆科技有限公司 | Down-pressure type external prestress CFRP material reinforcing system and construction method thereof |
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