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 PDFInfo
- 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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- Prior art keywords
- plate
- concrete
- steel
- carbon fiber
- waveform tooth
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- 239000004567 concrete Substances 0.000 title claims abstract description 69
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 49
- 239000004917 carbon fibers Substances 0.000 title claims abstract description 49
- 230000003014 reinforcing Effects 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- 238000003466 welding Methods 0.000 claims abstract description 14
- 238000004873 anchoring Methods 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 4
- 230000002787 reinforcement Effects 0.000 claims description 20
- 238000000034 methods Methods 0.000 claims description 11
- 239000011150 reinforced concrete Substances 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000010410 layers Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 5
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O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910001885 silicon dioxide Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000011901 water Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 6
- 238000003763 carbonization Methods 0.000 abstract description 3
- 239000011376 self-consolidating concrete Substances 0.000 abstract description 3
- 238000005452 bending Methods 0.000 abstract 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract 1
- 239000004568 cement Substances 0.000 abstract 1
- 238000005553 drilling Methods 0.000 abstract 1
- 230000002035 prolonged Effects 0.000 abstract 1
- 238000004901 spalling Methods 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000000463 materials Substances 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 2
- 230000000295 complement Effects 0.000 description 2
- 238000005516 engineering processes Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000012141 concentrates Substances 0.000 description 1
- 230000002079 cooperative Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003628 erosive Effects 0.000 description 1
- 239000000843 powders Substances 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
Classifications
-
- 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
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
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.
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| 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 |
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| 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 |
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| 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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