CN105887702A - Method for reinforcing concrete beam by prestressed carbon fiber plate and steel-concrete - Google Patents

Method for reinforcing concrete beam by prestressed carbon fiber plate and steel-concrete Download PDF

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Publication number
CN105887702A
CN105887702A CN201610247722.6A CN201610247722A CN105887702A CN 105887702 A CN105887702 A CN 105887702A CN 201610247722 A CN201610247722 A CN 201610247722A CN 105887702 A CN105887702 A CN 105887702A
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China
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plate
concrete
steel
carbon fiber
waveform tooth
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CN201610247722.6A
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Chinese (zh)
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CN105887702B (en
Inventor
康俊涛
张亚州
邱奕龙
马雷
李豪
谷倩
周旺保
秦世强
曹鸿猷
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武汉理工大学
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges

Abstract

The invention provides a method for reinforcing concrete beam by a prestressed carbon fiber plate and steel-concrete. The method comprises the following main steps of firstly, chiseling off a concrete protecting layer on the bottom surface of the concrete beam, drilling and embedding steel bars, and arranging a layer of a steel bar mesh; secondly, blanking a steel plate, and respectively welding waved toothed plates at an anchoring end and a tensioning end of the steel plate for constraining the carbon fiber plate; thirdly, fixing the steel plate on the steel bar mesh, and taking the reinforcing steel plate as a bottom die to prepare and cast self-compacting concrete; fourthly, applying prestress by adopting a jack, tensioning the carbon fiber plate and anchoring; finally, varnishing cement composite mortar on the surface of the prestressed carbon fiber plate and the waved toothed plates as protecting layers to finish the bending resistance and reinforcing of concrete. According to the reinforcing method provided by the invention, the convenience in construction is realized, and the required equipment is simple; the bending capacity, rigidity and the durability of the existing concrete beam can be remarkably improved, and the service life is prolonged; the reinforcing method is particularly suitable for conditions of concrete spalling, carbonization and other damages at the bottom of the concrete beam.

Description

A kind of pre-stressed carbon fiber plate and the method for steel-concrete reinforced concrete beam
Technical field
The invention belongs to the technical field of bridge engineering of civil engineering subject, particularly relate to a kind of pre-stressed carbon fiber plate and steel-coagulation The method of soil reinforced concrete beam.
Background technology
Along with social economy and the fast development of transportation cause, traffic flow increases substantially, rate of traffic flow and vehicle load Increasing, add the erosion of bridge local environment, a large amount of bridge of China occurs in that the aging acceleration of bridge, asking of Lack of support Topic, and owing to the reason bridge cover concrete carbonization of the aspects such as construction, environmental effect is serious, the protection to internal reinforcing bar Ability declines, and along with the crack on concrete surface, the corrosion of the internal reinforcing bar of bridge structure is accelerated, under bridge capacity Fall is very fast, makes there is potential potential safety hazard with bridge, is unfavorable for the development of the development of the national economy.Take effectively to transform to add Gu measure recovers and improve their bearing capacity so that it is continue as Modern Traffic service, huge economic effect can be brought to country Benefit.Domestic more existing experience have shown that, the reinforcing expense of bridge is about about the 30% of newly building bridge, and than rebuilding, new bridge is permissible Saving substantial amounts of fund, economic and social benefits are very notable, meet the theory building conservation-minded society.
Bridge structure is reinforced, is the raising bearing capacity of existing highway bridge structure, rigidity and durability, increases the service life Effective way.The most conventional reinforcement means has increasing section method for strengthening, affixing steel plate reinforcement method, stickup fibrous composite to add Gu method, external prestressing strengthening method, change structural system method for strengthening etc., wherein first three methods belongs to passive enforcement category, its Consolidation effect only just can manifest when bridge structure load-bearing again, and the stress performance of original structure is not improved effect, improves Bearing capacity limited.Latter two method belongs to actively reinforces category, but is affected by version, anchoring or material behavior, All there is certain limitation.
It is the once upgrading to sticking carbon fiber plate (cloth) reinforcement means that pre-stressed carbon fiber plate is reinforced.It is an active force Process, it is possible to i.e. to beam applying effect after strengthening construction completes, counterincision is sewed with good closure function.But also there is it not enough Part, such as: the anchor system of pre-stressed carbon fiber plate is the most disposable, easily there is brittle break in the beams of concrete that carbon fiber board is reinforced. Additionally, current carbon fiber board tensioning equipment is more complicated, inconvenient during construction.
It is that a kind of of structural strengthening technology is innovated and sent out that existing concrete flexural member is reinforced by principle based on combinative structure Exhibition, provides a kind of new thinking for structural strengthening.But during owing to using combinative structure to reinforce, between template and original component Gap less, use normal concrete, there is concrete can not vibration compacting, it is impossible to ensure concrete quality, new and old coagulation Soil can not effective cooperative problem, limit the application of combinative structure reinforcement technique.
Summary of the invention
The technical problem to be solved is the problem for above-mentioned existence, it is provided that a kind of pre-stressed carbon fiber plate and steel- The method of concrete strengthening beams of concrete, with three kinds of combination of materials reinforced concrete beams, both can increase substantially beams of concrete Bearing capacity, can improve again the rigidity of beams of concrete, ductility, globality and reliability, and easy construction, economic and practical, tool Have broad application prospects.
The present invention solve above-mentioned technical problem be the technical scheme is that a kind of pre-stressed carbon fiber plate and steel- The method of concrete strengthening beams of concrete, it is characterised in that comprise the steps:
A) beams of concrete treating reinforcing processes, and cuts the concrete cover of beams of concrete bottom surface, directly To exposing steel bar layer;Then steel planting after being cleaned processing, the reinforcing bar of implantation uses structure glue to fix;Wait planted reinforcing bar After Gu Ding, arrange one layer of bar-mat reinforcement, use tied silk to be fixed on planted reinforcing bar by bar-mat reinforcement;
B) blanking of steel plate and process, first according to steel plate design size, uses factory's automatically or semi-automatically cutting method to cut, The defects such as cut edge smooth surface, impulse-free robustness, seaming and the warpage of the steel plate after molding;Then, it is welded with at the steel plate back side WELDING STUDS, steel plate face bonding is connected to fixing end waveform tooth plate and fixed block, described fixed block has through hole;
C) fixation steel plate, the WELDING STUDS at the steel plate back side is fixed with bar-mat reinforcement tied silk colligation;
D) casting concrete, with steel plate as beam bottom mother plate, preparation casting concrete, treat reach 7 days the age of concrete and mix After solidifying soil intensity reaches more than the 90% of design strength, then carry out rear single stepping;
E) stretch-draw of pre-stressed carbon fiber plate and anchoring, according to design size cutting pre-stressed carbon fiber plate and pre-by cut One end of stress carbon fiber board is placed between base plate and the cover plate of fixing end waveform tooth plate, and the other end is placed in stretching end waveform tooth plate Between base plate and cover plate, and make the pre-stressed carbon fiber plate longitudinal axis centrage by waveform tooth plate, by stretching end waveform tooth plate On screw rod through the through hole on fixed block, the most sheathed fixing nut of external part, counter-force block and the counter-force nut at screw rod;So With spanner, each nut of waveform tooth plate is applied corresponding torsion afterwards, it is ensured that waveform tooth plate effectively anchoring the most not carbon fiber board Cut off carbon filament;Being placed in by jack between fixed block and counter-force block, after tightening counter-force nut, stretch-draw jack is to stretch-draw control step by step Stress processed;After stretch-draw completes, screw up with a wrench fixing nut, removal jack;Finally, on pre-stressed carbon fiber plate surface and Whitewashing cementitious composite mortar on waveform tooth plate as overcoat, complete beams of concrete is anti-bend reinforced.
By such scheme, described step A) described in cleaning to process be to use the scum silica frost on water cleaning concrete surface and dust, institute State longitudinal pitch 10cm that is arranged as of bar planting, horizontal spacing 5cm.
By such scheme, described step B) described in WELDING STUDS arrange density be 10cm × 10cm, use a diameter of 10mm, The WELDING STUDS of a length of 50mm.
By such scheme, described step D) concrete that used is high flow load, described high fluid self dense The slump of concrete is 20~22cm, and concrete design strength is not less than C40.
By such scheme, described fixing end waveform tooth plate and stretching end waveform tooth plate all include cover plate and base plate, described cover plate and the end The corresponding inner side end of plate is wavy surface, base plate and cover plate and is connected by bolt location, the base plate of stretching end waveform tooth plate End face outside is provided with screw rod.
The invention has the beneficial effects as follows: a kind of method that 1, pre-stressed carbon fiber plate and steel-concrete reinforced concrete beam are provided, The advantage of steel plate reinforcement and pre-stressed carbon fiber plate being concentrated in together, complement each other respective drawback, makes an active The structure of stress, after having constructed, beam body i.e. starts stress, makes the bearing capacity of beams of concrete have raising by a relatively large margin;2, steel The setting of plate solves the problem that the anchoring of pre-stressed carbon fiber plate is difficult, is welded on steel plate, between the two by fixing end waveform tooth plate Will not produce Relative sliding, the loss of prestress therefore produced also will be avoided;3, stretching end waveform tooth plate by fixed block and Jack between counter-force block carries out Shi Hanzhang, easily and effectively, expands and uses pre-stressed carbon fiber sheet material to carry out reinforcing Range of application;4, the cover concrete of soffit is all cut, between steel plate and beam, pour self-compacting concrete, so Ensure that the internal reinforcing bar of girder, no longer by environmental attack, improves the durability of structure.
Accompanying drawing explanation
Fig. 1 is the front view of one embodiment of the invention.
Fig. 2 is the upward view of one embodiment of the invention.
Fig. 3 is the structural representation of the fixing end waveform tooth plate of one embodiment of the invention.
Fig. 4 is the structural representation of the stretching end waveform tooth plate of one embodiment of the invention.
Wherein: 1. steel plate, 2. pre-stressed carbon fiber plate, 3. fixing end waveform tooth plate, 4. bolt, 5. beams of concrete, 6. stretch-draw End waveform tooth plate, 7. fixed block, 8. counter-force block, 9. screw rod, 10. fix nut, 11. counter-force nuts, 12. base plates, 13. lids Plate, 14. reinforcing bars implanted, 15. bar-mat reinforcements, 16. WELDING STUDSs.
Detailed description of the invention
For being more fully understood that the present invention, below in conjunction with the accompanying drawings with embodiment to further description of the present invention.
As Figure 1-4, a kind of pre-stressed carbon fiber plate and the method for steel-concrete reinforced concrete beam, comprise the steps:
1, the beams of concrete 5 treating reinforcing processes, and cuts the concrete cover of beams of concrete bottom surface, Until exposing steel bar layer;Then steel planting after being cleaned processing, the reinforcing bar 14 of implantation uses structure glue to fix, bar planting It is arranged as longitudinal pitch 10cm, horizontal spacing 5cm;After planted reinforcing bar is fixing, arranging one layer of bar-mat reinforcement 15, employing tied silk will Bar-mat reinforcement is fixed on planted reinforcing bar;
2, the blanking of steel plate 1 and process, first according to steel plate design size, uses factory's automatically or semi-automatically cutting method to cut Cut, the defect such as cut edge smooth surface, impulse-free robustness, seaming and warpage of the steel plate after molding;Then, weld at the steel plate back side Being connected to WELDING STUDS 16, the density that WELDING STUDS is arranged is 10cm × 10cm, uses a diameter of 10mm, the WELDING STUDS of a length of 50mm, Steel plate face bonding is connected to fixing end waveform tooth plate 3 and fixed block 7, and fixed block has through hole;
3, fixation steel plate, the WELDING STUDS at the steel plate back side is fixed with bar-mat reinforcement tied silk colligation;
4, casting concrete, with steel plate as beam bottom mother plate, preparation casting concrete, treat reach 7 days the age of concrete and mix After solidifying soil intensity reaches more than the 90% of design strength, then carrying out rear single stepping, the concrete used is high fluid self dense Concrete, the slump of high flow load is 20~22cm, and concrete design strength is not less than C40;
5, the stretch-draw of pre-stressed carbon fiber plate 2 and anchoring, according to design size cutting pre-stressed carbon fiber plate, And the two ends of the pre-stressed carbon fiber plate cut are fixed by fixing end waveform tooth plate and stretching end waveform tooth plate 6 respectively, Gu Fixed end waveform tooth plate and stretching end waveform tooth plate all include that the inner side end of the correspondence of cover plate 13 and base plate 12, cover plate and base plate is equal Being connected by bolt 4 location for wavy surface, base plate and cover plate, the end face outside of the base plate of stretching end waveform tooth plate is provided with screw rod, The two ends of pre-stressed carbon fiber plate are respectively placed between fixing end waveform tooth plate and base plate and the cover plate of stretching end waveform tooth plate, and make The pre-stressed carbon fiber plate longitudinal axis centrage by waveform tooth plate, by the screw rod 9 on stretching end waveform tooth plate through fixed block On through hole, the most sheathed fixing nut 10 of external part, counter-force block 8 and the counter-force nut 11 at screw rod;Then with spanner to ripple Each nut of shape tooth plate applies corresponding torsion, it is ensured that the effectively anchoring of carbon fiber board is not the most cut off carbon filament by waveform tooth plate;Will Jack is placed between fixed block and counter-force block, and after tightening counter-force nut, stretch-draw jack is to control stress for prestressing step by step;Stretch-draw After completing, screw up with a wrench fixing nut, removal jack;Finally, powder on pre-stressed carbon fiber plate surface and waveform tooth plate Decorations cementitious composite mortar is as overcoat, and complete beams of concrete is anti-bend reinforced.
The reinforcement means that two kinds conventional is effectively combined by the present invention, it may be assumed that excellent by steel plate reinforcement and pre-stressed carbon fiber plate Point concentrates in together, and complement each other respective drawback.It is used alone pre-stressed carbon fiber sheet material reinforced concrete beam one the biggest A difficult problem is exactly anchorage problem, and As time goes on, loss of prestress will increase therewith.The setting of steel plate solves pre-answering The problem that the anchoring of power carbon fiber board is difficult, is welded on anchoring waveform tooth plate on steel plate, will not produce Relative sliding between the two, because of This and the loss of prestress that produces also will be avoided.
The problem that the present invention solves carbon fiber sheet stretch-draw difficulty.One end is fixed freely in waveform tooth plate one end, by fixed block With the jack between counter-force block carries out Shi Hanzhang, easily and effectively, expand use pre-stressed carbon fiber sheet material and reinforce Range of application.
Reinforcing beam only with steel plate is the reinforcement means of a kind of passive secondary loading, only when beam is again by external load Steel plate just can provide bearing capacity, and Shi Hanzhang is then a good solution.The present invention is fine by the carbon of Shi Hanzhang Dimension sheet material is reinforced with steel and is combined, and is allowed to the structure of a referred to as active force, and after having constructed, beam body i.e. starts stress, makes The bearing capacity of beams of concrete has raising by a relatively large margin.Cover concrete at the bottom of beam is all cut by the present invention, steel plate and beam it Between pour self-compacting concrete, this ensure that internal reinforcing bar, no longer by environmental attack, improves structure durability.
The reinforcement means easy construction that the present invention provides, it is not necessary to large complicated tensioning equipment, only one jack can complete to add Gu work, being particularly suited for beams of concrete base concrete has carbonization, peeling, or allows to increase the situation of member section height, The most wide application prospect is had in civil engineering structure reinforcement technique field.

Claims (5)

1. a pre-stressed carbon fiber plate and the method for steel-concrete reinforced concrete beam, it is characterised in that comprise the steps:
A) beams of concrete treating reinforcing processes, and cuts the concrete cover of beams of concrete bottom surface, directly To exposing steel bar layer;Then steel planting after being cleaned processing, the reinforcing bar of implantation uses structure glue to fix;Wait planted reinforcing bar After Gu Ding, arrange one layer of bar-mat reinforcement, use tied silk to be fixed on planted reinforcing bar by bar-mat reinforcement;
B) blanking of steel plate and process, first according to steel plate design size, uses factory's automatically or semi-automatically cutting method to cut, The defects such as cut edge smooth surface, impulse-free robustness, seaming and the warpage of the steel plate after molding;Then, it is welded with at the steel plate back side WELDING STUDS, steel plate face bonding is connected to fixing end waveform tooth plate and fixed block, described fixed block has through hole;
C) fixation steel plate, the WELDING STUDS at the steel plate back side is fixed with bar-mat reinforcement tied silk colligation;
D) casting concrete, with steel plate as beam bottom mother plate, preparation casting concrete, treat reach 7 days the age of concrete and mix After solidifying soil intensity reaches more than the 90% of design strength, then carry out rear single stepping;
E) stretch-draw of pre-stressed carbon fiber plate and anchoring, according to design size cutting pre-stressed carbon fiber plate and pre-by cut One end of stress carbon fiber board is placed between base plate and the cover plate of fixing end waveform tooth plate, and the other end is placed in stretching end waveform tooth plate Between base plate and cover plate, and make the pre-stressed carbon fiber plate longitudinal axis centrage by waveform tooth plate, by stretching end waveform tooth plate On screw rod through the through hole on fixed block, the most sheathed fixing nut of external part, counter-force block and the counter-force nut at screw rod;So With spanner, each nut of waveform tooth plate is applied corresponding torsion afterwards, it is ensured that waveform tooth plate effectively anchoring the most not carbon fiber board Cut off carbon filament;Being placed in by jack between fixed block and counter-force block, after tightening counter-force nut, stretch-draw jack is to stretch-draw control step by step Stress processed;After stretch-draw completes, screw up with a wrench fixing nut, removal jack;Finally, on pre-stressed carbon fiber plate surface and Whitewashing cementitious composite mortar on waveform tooth plate as overcoat, complete beams of concrete is anti-bend reinforced.
A kind of pre-stressed carbon fiber plate the most according to claim 1 and the method for steel-concrete reinforced concrete beam, its feature Be, described step A) described in cleaning to process be to use the scum silica frost on water cleaning concrete surface and dust, the cloth of described bar planting It is set to longitudinal pitch 10cm, horizontal spacing 5cm.
A kind of pre-stressed carbon fiber plate the most according to claim 1 and steel-concrete reinforced concrete beam Method, it is characterised in that described step B) described in WELDING STUDS arrange density be 10cm × 10cm, use a diameter of 10mm, The WELDING STUDS of a length of 50mm.
A kind of pre-stressed carbon fiber plate the most according to claim 1 and the method for steel-concrete reinforced concrete beam, its feature It being, described step D) concrete that used is high flow load, collapsing of described high flow load Degree of falling is 20~22cm, and concrete design strength is not less than C40.
A kind of pre-stressed carbon fiber plate the most according to claim 1 and the method for steel-concrete reinforced concrete beam, it is special Levying and be, described fixing end waveform tooth plate and stretching end waveform tooth plate all include cover plate and base plate, described cover plate and the correspondence of base plate Inner side end be wavy surface, base plate and cover plate by bolt location be connected, the end face outside of the base plate of stretching end waveform tooth plate It is provided with screw rod.
CN201610247722.6A 2016-04-20 2016-04-20 A kind of method of pre-stressed carbon fiber plate and steel concrete reinforced concrete beam CN105887702B (en)

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CN106337567A (en) * 2016-09-18 2017-01-18 哈尔滨工业大学 Fiber enhanced composite material plate and steel plate combined structure used for reinforcing concrete beam
CN106544962A (en) * 2016-10-28 2017-03-29 同济大学 The prestress reinforced construction method of xoncrete structure
CN106639354A (en) * 2017-01-10 2017-05-10 武汉理工大学 Method for reinforcing concrete beam shear-bearing capacity of steel plate and pre-stressed carbon fiber cloth
CN106702914A (en) * 2017-01-10 2017-05-24 广西大学 Reinforcing system capable of improving load bearing capacity of concrete structures and construction method of reinforcing system
CN107178040A (en) * 2017-01-24 2017-09-19 湘潭大学 A kind of bridge structure reinforces mould and reinforcement means
CN107815979A (en) * 2017-10-30 2018-03-20 北京旭建工程科技发展有限责任公司 A kind of box beam beam bottom prestressing force enhancing bracing means and its construction method
CN108374354A (en) * 2018-04-12 2018-08-07 中国十七冶集团有限公司 A method of using pre-stressed carbon fiber plate reinforcement bridge
CN108442261A (en) * 2018-05-23 2018-08-24 河南罡源电子科技有限公司 A kind of damaged prosthetic device at Bridge Beam bottom
CN108532476A (en) * 2018-05-23 2018-09-14 河南罡源电子科技有限公司 A kind of method for repairing damage at Bridge Beam bottom
CN109695205A (en) * 2019-01-10 2019-04-30 郑州铁路职业技术学院 System reinforcement method for steel plate combination continuous beam
WO2019137545A1 (en) * 2018-01-12 2019-07-18 长沙理工大学 Pre-stressed bailey beam for reinforcement, and construction method therefor

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106337567A (en) * 2016-09-18 2017-01-18 哈尔滨工业大学 Fiber enhanced composite material plate and steel plate combined structure used for reinforcing concrete beam
CN106337567B (en) * 2016-09-18 2019-03-19 哈尔滨工业大学 Fiber-reinforced composite material board, armor Plate for concrete beam strengthening
CN106544962B (en) * 2016-10-28 2018-07-03 同济大学 The prestress reinforced construction method of concrete structure
CN106544962A (en) * 2016-10-28 2017-03-29 同济大学 The prestress reinforced construction method of xoncrete structure
CN106639354B (en) * 2017-01-10 2018-12-18 武汉理工大学 The method of steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity
CN106702914B (en) * 2017-01-10 2019-06-07 广西大学 A kind of hardened system and its construction method promoting concrete structure bearing capacity
CN106639354A (en) * 2017-01-10 2017-05-10 武汉理工大学 Method for reinforcing concrete beam shear-bearing capacity of steel plate and pre-stressed carbon fiber cloth
CN106702914A (en) * 2017-01-10 2017-05-24 广西大学 Reinforcing system capable of improving load bearing capacity of concrete structures and construction method of reinforcing system
CN107178040B (en) * 2017-01-24 2018-12-28 湘潭大学 A kind of bridge structure reinforces mold and reinforcement means
CN107178040A (en) * 2017-01-24 2017-09-19 湘潭大学 A kind of bridge structure reinforces mould and reinforcement means
CN107815979A (en) * 2017-10-30 2018-03-20 北京旭建工程科技发展有限责任公司 A kind of box beam beam bottom prestressing force enhancing bracing means and its construction method
WO2019137545A1 (en) * 2018-01-12 2019-07-18 长沙理工大学 Pre-stressed bailey beam for reinforcement, and construction method therefor
CN108374354A (en) * 2018-04-12 2018-08-07 中国十七冶集团有限公司 A method of using pre-stressed carbon fiber plate reinforcement bridge
CN108532476A (en) * 2018-05-23 2018-09-14 河南罡源电子科技有限公司 A kind of method for repairing damage at Bridge Beam bottom
CN108442261A (en) * 2018-05-23 2018-08-24 河南罡源电子科技有限公司 A kind of damaged prosthetic device at Bridge Beam bottom
CN109695205A (en) * 2019-01-10 2019-04-30 郑州铁路职业技术学院 System reinforcement method for steel plate combination continuous beam

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