CN106639354A - Method for reinforcing concrete beam shear-bearing capacity of steel plate and pre-stressed carbon fiber cloth - Google Patents
Method for reinforcing concrete beam shear-bearing capacity of steel plate and pre-stressed carbon fiber cloth Download PDFInfo
- Publication number
- CN106639354A CN106639354A CN201710016571.8A CN201710016571A CN106639354A CN 106639354 A CN106639354 A CN 106639354A CN 201710016571 A CN201710016571 A CN 201710016571A CN 106639354 A CN106639354 A CN 106639354A
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- Prior art keywords
- steel plate
- plate
- concrete
- beams
- carbon cloth
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0244—Increasing or restoring the load-bearing capacity of building construction elements of beams at places of holes, e.g. drilled in them
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
Abstract
The invention discloses a method for reinforcing a concrete beam shear-bearing capacity of a steel plate and pre-stressed carbon fiber cloth. The method comprises the following steps: step 1: treating a concrete beam; step 2: blanking the steel plate and cutting the carbon fiber cloth; step 3: sticking the steel plate; step 4: mounting and fixing a wave-shaped tooth plate and a counter force block; and step 5: tensioning and anchoring the carbon fiber cloth. The method disclosed by the invention is not a single fixation manner any more, but is the effective combination of a steel plate reinforcing method and a pre-stressed carbon fiber cloth reinforcing method; the shear-bearing capacity can be provided after the structure is reinforced due to the application of pre-stress, and the pre-stress can reduce the width of cracks, even close the cracks; and meanwhile, a carbon fiber cloth material and the steel plate are stuck and the sticking effect is remarkably better than the effect of sticking the carbon fiber cloth material on concrete. Furthermore, equipment for stretching the carbon fiber cloth is simple and is easy to realize, and the stretching can be finished through only one jack; and the method is simple and convenient and is efficient and economical.
Description
Technical field
The present invention relates to a kind of method of concrete beam strengthening, and in particular to steel plate and prestressed carbon cloth reinforced coagulation
The method of native beam shear-carrying capacity, is mainly used in Technology Bridge Strengthening field.
Background technology
At present most of bridges have that downwarp is excessive, and Lack of support problem, particularly some active times are longer, bear
The larger bridge of the volume of traffic.The bridge of these Lack of support is carried out removing rebuilding and was both blocked traffic, but it is uneconomical, therefore and
It is inadvisable.
Existing solution is that consolidation process is carried out to bridge, improves the bearing capacity and stiffness of bridge, enables to reach
The load requirement of certain grade, continues to be on active service.Common method is to use steel plate, carbon cloth, prestressed carbon cloth etc. several
Plant material to reinforce old bridge.Steel plate reinforcement the bearing capacity and stiffness of lift structure is played the role of it is larger, while steel plate
Beam concrete can be protected, the concrete in crack is particularly had occurred and that, on the one hand the setting of steel plate delays the carbonization of concrete,
On the other hand, internal reinforcing bar is also protected not corroded by external environment condition.But one apparent shortcoming of steel plate reinforcement is that it is received
Power mode, steel plate reinforcement is the mode of secondary loading, and steel plate just understands stress only in beam bearing load again, could provide and hold
Carry power.This is relatively light for damaging, and amount of deflection is not that very big structure is more effective, but the beams of concrete more serious for damage,
Effect is not then obvious.
It is a kind of mode of active force to carry out reinforcing using prestressed carbon cloth, and structure is opened after completing to reinforce
Begin to provide bearing capacity, but carry out reinforcing using carbon cloth and there is also some disadvantages, such as the anchoring of prestressed carbon cloth
Problem, due to prestressed setting, needs the waveform tooth plate for clamping carbon cloth to be securely fixed on beams of concrete, and this
Any is that old bridge institute is difficult provides, because concrete carbonization can have a strong impact on the fixed effect of waveform tooth plate.
Shear Strengthening is needed in vertical tension prestressing force sheet material, the larger space of heavy tensioning equipment needs, and coagulation
Native beam shear-carrying capacity is reinforced often does not possess such condition, therefore less using the situation of prestressing force shear-carrying capacity reinforcing.
The content of the invention
An object of the present invention be provide a kind of steel plate and prestressed carbon cloth composite reinforcement, while being also anti-
The method for reinforcing concrete beam of reinforcement is cut, what the present invention was realized in：
Steel plate and the method for prestressed carbon cloth reinforced beams of concrete shear-carrying capacity, comprise the steps：
Step 1：Beams of concrete process
Beams of concrete is surface-treated, and according to the size and position of steel plate and fixing end waveform tooth plate on beams of concrete
Setting-out, drills according to setting-out position, and drilling runs through beams of concrete, and drilling is respectively used to fixation steel plate and fixing end waveform tooth plate；
The dust of beams of concrete is cleared up after the completion of setting-out, drilling；
Step 2：The blanking of steel plate and the cutting of carbon cloth
Blanking process is carried out to steel plate, steel plate carries out wharf's pavement quality with beams of concrete contact surface；
Cutting is carried out to carbon cloth, according to the width cutting of waveform tooth plate, and ensures carbon cloth flush edge non-notch；
Step 3：The stickup of steel plate
Epoxy glue is smeared according to steel plate setting-out position on beams of concrete, before epoxy adhesive curing steel plate was pasted, pasted
Steel plate is fixed into the rear fixation steel plate bolt using through beams of concrete；
Step 4：The installation of waveform tooth plate and counter-force block is fixed
According to the bore position for anchoring fixing end waveform tooth plate of step 1, using run through bolt, one end anchoring fixing end ripple
Shape tooth plate, the other end fixes anchor block, so as to fixing end waveform tooth plate and anchor block are fixed on beams of concrete, in concrete
Beam is provided with the side of anchor block, is provided with stretching end waveform tooth plate, and the side of stretching end waveform tooth plate is provided with screw rod, screw rod
Anchor block and counter-force block are sequentially passed through, on the screw rod between anchor block and counter-force block, nut is provided with；
Step 5：The stretch-draw anchor of carbon cloth
One end of carbon cloth is placed between the base plate of fixing end waveform tooth version and cover plate, is fixed using high-strength bolt,
Then carbon cloth is coordinated into steel plate direction arrangement, and by the other end of carbon cloth be placed in stretching end waveform tooth plate base plate and
Between cover plate, also it is fixed using high-strength bolt, because stretching end waveform tooth plate is not affixed on beams of concrete, now will
Jack is placed between anchor block and counter-force block the tensioning work that carbon cloth is completed by applying power；Anchor is tightened after the completion of tensioning
Gu the nut behind block is completed to reinforce and installed.
Further scheme is：In step 1, beams of concrete is surface-treated, including：Beams of concrete surface is entered
The smooth process of row, by the serious concrete chisel removal that is carbonized, and is repaired using cement mortar, and the region more serious to hollow makes
Carried out with cement mortar floating, it is ensured that process completes the maximum hollow depth on back rest surface within 3mm.
Further scheme is：In step 2, blanking process is carried out to steel plate, completed in factory, protected after the completion of blanking
Card steel plate does not have seaming, burr phenomena.
Further scheme is：In step 2, wharf's pavement quality, the plucking direction of steel plate is oblique beams of concrete inner side 45
Degree.
Further scheme is：In step 3, steel sticking need to ensure that epoxy glue is full of space between steel plate and beam body,
And emptying bubble.
Further scheme is：Described fixing end waveform tooth plate and stretching end waveform tooth plate includes base plate, cover plate
And the high-strength bolt between base plate and cover plate.
Further scheme is：Deflecting plate is set in the corner of steel plate outer surface, deflecting plate material is polytetrafluoroethyl-ne
Alkene, deflecting plate is located in the middle of carbon cloth and steel plate, and the width of deflecting plate is not less than the width of carbon cloth.
Further scheme is：The process that described stretching end waveform tooth plate is widened, makes cover plate be located at base plate
Within.
The present invention is no longer single reinforcing mode, but by steel plate reinforcement and prestressed carbon cloth reinforced two methods
Effectively combined, prestressed applying makes structure that shear-carrying capacity can be provided after reinforcing is completed, and in advance should
Power can reduce the width in crack, or even sealed fracture, meanwhile, solve the bonding of prestressed carbon cloth material and beams of concrete
Problem, carbon cloth material and steel plate are bondd, and bond effect is substantially better than and is bonded on concrete.In addition tensioning carbon fiber
Cloth equipment is simple, it is easy to accomplish, compared to the tensioning equipment of conventional cumbersome, only need a jack to complete tensioning, simply
It is convenient, high-efficiency and economic.
Structural strengthening at present is mostly anti-bending bearing capacity reinforcing, and due to tensioning equipment spacial influence, and steering arranges tired
Difficulty, carries out shear-carrying capacity reinforcing and applies less in engineering using prestressing force, but what structure was failed due to shear-carrying capacity
Accident is much, structure setting and method that the present invention passes through the above, and component shear-carrying capacity can be carried out effectively to add
Gu.
Description of the drawings
Fig. 1 is the cross-sectional view of shear-carrying capacity composite reinforcement method；
Fig. 2 is the side view of shear-carrying capacity composite reinforcement method；
Fig. 3 is carbon cloth anchored end waveform tooth plate figure；
Fig. 4 is carbon cloth stretching end waveform tooth plate figure；
Fig. 5 is waveform tooth plate side view；
Fig. 6 is stretching end installation drawing；
Wherein：1st, concrete beam body to be reinforced, 2, steel plate, 3, carbon cloth, 4, fixing end waveform tooth plate, 5, stretching end waveform
Tooth plate, 6, anchor block, 7, counter-force block, 8, screw rod, 9, run through bolt, 10, fixation steel plate bolt, 11, deflecting plate, 12, base plate,
13rd, cover plate, 14, high-strength bolt, 15, nut.
Specific embodiment
Steel plate and the method for prestressed carbon cloth reinforced beams of concrete shear-carrying capacity, are realized by following steps：
Step 1：
The process of beams of concrete 1, by the surface of beams of concrete 1 to be reinforced smooth process is carried out, by the serious concrete chisel that is carbonized
Remove, and repaired using mortar, the region more serious to hollow is carried out floating using cement mortar, it is ensured that process completes the back rest
The maximum hollow depth on surface is within 3mm.Then put according to the size and position of steel plate and fixing end waveform tooth plate 4
Sample.And drilled according to the position of setting-out, drilling should run through beams of concrete 1, and drilling is respectively used to fixation steel plate 2 and fixing end
Waveform tooth plate 4.Setting-out, drilling should be processed beams of concrete 1 again after completing, and mainly clear up dust.
Step 2：
The blanking of steel plate 2 is operated in factory and completes, and the quality of steel plate is should ensure that after the completion of blanking, it is impossible to have the phenomenons such as seaming, burr,
To prevent prestressed carbon cloth 3 from being broken.Steel plate 2 carries out wharf's pavement quality, the plucking side of steel plate with the contact surface of beams of concrete 1
To for 45 degree on the inside of oblique beams of concrete.Cutting is carried out to carbon cloth 3 according to the width of fixing end waveform tooth version 4, cutting should
Ensure the flush edge non-notch of carbon cloth 3.
Step 3：
The stickup of steel plate 2.Epoxy glue is smeared according to setting-out position on beams of concrete after the completion of the blanking of steel plate 2, and in epoxy glue
Steel plate 2 is pasted between solidification, affixing steel plate 2 should ensure that epoxy glue is full of space between steel plate and beam body, and want emptying gas
Bubble.Steel plate 2 is fixed after positioning using the fixation steel plate bolt 10 through beams of concrete 1.
Step 4：
According to the bore position for anchoring fixing end waveform tooth plate 4 of step 1, using run through bolt 9, one end anchoring fixing end
Waveform tooth plate, the other end fixes anchor block 6, so as to fixing end waveform tooth plate and anchor block are fixed on beams of concrete, mixed
Solidifying Tu Liang is provided with the side of anchor block, is provided with stretching end waveform tooth plate 5, and the side of stretching end waveform tooth plate is provided with screw rod
8, screw rod sequentially passes through anchor block 6 and counter-force block 7, on the screw rod 8 between anchor block and counter-force block, is provided with nut 15.
Step 5：
The tensioning of carbon cloth 3.Do not fix in the waveform tooth plate 5 of stretching end, screw rod 8, screw rod are welded with behind waveform tooth plate 5
8 pass sequentially through anchor block 6 and counter-force block 7.Jack is placed between anchor block 6 and counter-force block 7 by applying power and completes carbon fibre
The tensioning work of dimension cloth 3.The nut 15 after anchor block 6 is tightened after the completion of tensioning.
One end of carbon cloth 3 is placed between the base plate 12 of fixing end waveform tooth version and cover plate 13, using high-strength bolt
15 are fixed, and then carbon cloth are coordinated into steel plate direction arrangement, and the other end of carbon cloth is placed in into stretching end waveform
Between the base plate 12 and cover plate 13 of tooth plate, also it is fixed using high-strength bolt 14.
Deflecting plate 11 is set in the corner of steel plate outer surface, deflecting plate material is polytetrafluoroethylene (PTFE), and deflecting plate is located at carbon
In the middle of fiber cloth and steel plate, and the width of deflecting plate is not less than the width of carbon cloth.
Because stretching end waveform tooth plate is not affixed on beams of concrete, now jack is placed in into anchor block 6 and counter-force
Applying power can complete the tensioning work of carbon cloth between block 7；The nut 15 tightened after the completion of tensioning behind anchor block is i.e. complete
Install into reinforcing.
Claims (8)
1. the method for steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity, it is characterised in that including following step
Suddenly：
Step 1：Beams of concrete process
Beams of concrete is surface-treated, and according to the size and position of steel plate and fixing end waveform tooth plate on beams of concrete
Setting-out, drills according to setting-out position, and drilling runs through beams of concrete, and drilling is respectively used to fixation steel plate and fixing end waveform tooth plate；
The dust of beams of concrete is cleared up after the completion of setting-out, drilling；
Step 2：The blanking of steel plate and the cutting of carbon cloth
Blanking process is carried out to steel plate, steel plate carries out wharf's pavement quality with beams of concrete contact surface；
Cutting is carried out to carbon cloth, according to the width cutting of fixing end waveform tooth plate, and ensure carbon cloth flush edge without
Breach；
Step 3：The stickup of steel plate
Epoxy glue is smeared according to steel plate setting-out position on beams of concrete, and steel plate was pasted before epoxy adhesive curing, pasted
After the completion of using being fixed to steel plate through the fixation steel plate bolt of beams of concrete；
Step 4：The installation of waveform tooth plate and counter-force block is fixed
According to the bore position for anchoring fixing end waveform tooth plate of step 1, using run through bolt, one end anchoring fixing end ripple
Shape tooth plate, the other end fixes anchor block, so as to fixing end waveform tooth plate and anchor block are fixed on beams of concrete；In concrete
Beam is provided with the side of anchor block, installs stretching end waveform tooth plate, and the side of stretching end waveform tooth plate is provided with screw rod, screw rod according to
It is secondary through anchor block and counter-force block, on the screw rod between anchor block and counter-force block, be provided with nut；
Step 5：The stretch-draw anchor of carbon cloth
One end of carbon cloth is placed between the base plate of fixing end waveform tooth version and cover plate, is fixed using high-strength bolt,
Then carbon cloth is coordinated into steel plate direction arrangement, and by the other end of carbon cloth be placed in stretching end waveform tooth plate base plate and
Between cover plate, also it is fixed using high-strength bolt, because stretching end waveform tooth plate is not affixed on beams of concrete, now will
Jack is placed between anchor block and counter-force block the tensioning work that carbon cloth is completed by applying power；Anchor is tightened after the completion of tensioning
Gu the nut behind block is completed to reinforce and installed.
2. the method for steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity according to claim 1, it is special
Levy and be：
In step 1, beams of concrete is surface-treated, including：Smooth process is carried out to beams of concrete surface, carbonization is serious
Concrete chisel removal, and repaired using cement mortar, the region more serious to hollow is carried out floating using cement mortar, is protected
Card process completes the maximum hollow depth on back rest surface within 3mm.
3. the method for steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity according to claim 1, it is special
Levy and be：
In step 2, blanking process is carried out to steel plate, completed in factory, ensure that steel plate does not have seaming, burr existing after the completion of blanking
As.
4. according to claim 1 or 3 steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity method, its
It is characterised by：
In step 2, wharf's pavement quality, the plucking direction of steel plate is 45 degree of oblique beams of concrete inner side.
5. the method for steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity according to claim 1, it is special
Levy and be：
In step 3, steel sticking need to ensure that epoxy glue is full of space between steel plate and beam body, and emptying bubble.
6. the method for steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity according to claim 1, it is special
Levy and be：
Described fixing end waveform tooth plate and stretching end waveform tooth plate include base plate, cover plate and installed in base plate and cover plate it
Between high-strength bolt.
7. the method for steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity according to claim 1, it is special
Levy and be：Deflecting plate is set in the corner of steel plate outer surface, deflecting plate material is polytetrafluoroethylene (PTFE), and deflecting plate is located at carbon fiber
In the middle of cloth and steel plate, and the width of deflecting plate is not less than the width of carbon cloth.
8. the method for steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity according to claim 1, it is special
Levy and be：The process that described stretching end and anchored end waveform tooth plate is widened, makes cover plate be located within base plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710016571.8A CN106639354B (en) | 2017-01-10 | 2017-01-10 | The method of steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity |
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|---|---|---|---|
| CN201710016571.8A CN106639354B (en) | 2017-01-10 | 2017-01-10 | The method of steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity |
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| CN106639354B CN106639354B (en) | 2018-12-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113550617A (en) * | 2020-04-26 | 2021-10-26 | 山西同新复材技术有限公司 | Reinforcing structure, reinforcing rod and reinforcing method thereof |
| CN117432101A (en) * | 2023-12-21 | 2024-01-23 | 西南石油大学 | Assembled CFRP-slotted steel plate shear wall structure and assembling method thereof |
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| CN105887702A (en) * | 2016-04-20 | 2016-08-24 | 武汉理工大学 | Method for reinforcing concrete beam by prestressed carbon fiber plate and steel-concrete |
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2017
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003328561A (en) * | 2002-05-14 | 2003-11-19 | Dps Bridge Works Co Ltd | Reinforcing method for concrete member and tensioning device for tendon used therein |
| US20060272246A1 (en) * | 2003-09-09 | 2006-12-07 | Hans-Peter Andra | Anchoring for strip-shaped traction elements on supporting structures |
| CN101245668A (en) * | 2008-03-11 | 2008-08-20 | 李唐宁 | Construction method for two-side reinforcing engineering structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113550617A (en) * | 2020-04-26 | 2021-10-26 | 山西同新复材技术有限公司 | Reinforcing structure, reinforcing rod and reinforcing method thereof |
| CN117432101A (en) * | 2023-12-21 | 2024-01-23 | 西南石油大学 | Assembled CFRP-slotted steel plate shear wall structure and assembling method thereof |
| CN117432101B (en) * | 2023-12-21 | 2024-03-05 | 西南石油大学 | Assembled CFRP-slotted steel plate shear wall structure and assembling method thereof |
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| CN106639354B (en) | 2018-12-18 |
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