CN110438910A - A kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end - Google Patents
A kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end Download PDFInfo
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- CN110438910A CN110438910A CN201910608577.3A CN201910608577A CN110438910A CN 110438910 A CN110438910 A CN 110438910A CN 201910608577 A CN201910608577 A CN 201910608577A CN 110438910 A CN110438910 A CN 110438910A
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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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- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
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Abstract
A kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end, the steps include: 1. to slot, symmetrically opens up the identical end grooves of quantity at the both ends of the tension side of concrete structure to be reinforced；2. installing FRP plate device for exerting in the end of concrete structure；3. by tensioning equipment tensioning FRP plate item, to FRP plate row replacement Prestressing；The both ends of FRP plate item are respectively pressed into the end grooves at concrete structure both ends with FRP plate device for exerting, the surface filling adhesive into end grooves and between the corresponding end grooves of concrete structure；4. putting tension prestress after to be bonded dose of solidification, FRP plate device for exerting is removed；Consolidation effect of the present invention is good, smaller to the destruction of existing structure, significantly reduces engineering cost.
Description
Technical field
The present invention relates to the reinforcement technique field of concrete structure, especially a kind of embedding patch pre-stress FRP lath in end
Concrete structure reinforcement method.
Background technique
China is completed more than 1,000,000 seat of railway and highway bridge at present, is qualified bridge big country, wherein percentage
90 or more be concrete-bridge.Due to the swift and violent growth of the volume of traffic and vehicular load, treatment rates performance degradation and safety
Property decline the problem of become increasingly conspicuous, the bridge collapse event frequently occurred make society the military service of bridge is proposed safely it is higher
Requirement, novel bridge reinforcement technique is badly in need of obtaining development and application.
It is reinforced based on the Technology Bridge Strengthening of fibre reinforced composites (FRP) compared to conventional steel bar concrete bridge structure
Method has many advantages: FRP specific strength is high, hardly increase reinforced structure quality；It is corrosion-resistant good, it adapts to coastal etc.
The structural strengthening of corrosive environment；It reinforces high-efficient, can reach the 80% of its design strength within binder three days.Plurality of advantages makes
Reinforcement technique based on FRP has been widely used in the reinforcing of concrete structure especially bridge and has achieved good effect
Fruit.But FRP elasticity modulus is lower with respect to its intensity, therefore when reinforced steel concrete structure, Materials with High Strength performance is difficult to send out
It waves, needs to apply prestressing force to it.Current feasible pre-stress FRP reinforcement means mainly has surface mount and two kinds of Strengthened With Near Surface Mounted
Mode.Surface mount pre-stress FRP reinforcement means is easy for construction, but the characteristic of FRP and concrete structure single side bonding makes FRP
It is easy to happen stripping damage, is unable to give full play the material property of FRP；Simultaneously for the biggish material of the tensible rigidities such as FRP plate,
Bonding between FRP and concrete can not resist anchoring of the prestressing force realization to FRP, therefore often need the setting permanent anchorage of FRP
Inhibit stripping damage and anchoring prestress, so significantly increases cost again.Strengthened With Near Surface Mounted pre-stress FRP be by FRP tendons or
Lath tensioning is embedded in the pre-slotting of concrete cover after applying prestressing force, and makes FRP and concrete knot with binder bonding
A kind of structural strengthening method of structure cooperative bearing.Compared with surface mount, Strengthened With Near Surface Mounted mode has greatly expanded FRP and concrete
Between bond area, significantly improve the cementitiousness between FRP and concrete, therefore can effectively inhibit stripping damage and pass through
FRP- concrete binding realizes to prestressed anchoring, no setting is required the permanent anchorage of FRP and reduce costs.But this kind of reinforcing side
Method need in structural concrete protective layer fluting and cross-notching required precision it is higher, for larger structure as greatly across
Degree bridge increases construction workload, while needing to carry out structure fluting on a large scale before reinforcing and also easily causing regulatory authorities pair
The worry or misgivings of structural damage.
Summary of the invention
The technical problem to be solved by the present invention is overcoming drawbacks described above, the interlude for providing a kind of pre-stress FRP lath is viscous
It is affixed on concrete structural surface, the embedding reinforcement means being affixed in concrete structure slot in end.
The present invention solve technical problem the technical solution adopted is that: a kind of concrete of the embedding patch pre-stress FRP lath in end
Structural strengthening method, step are as follows:
1. slotting, the identical end grooves of quantity are symmetrically opened up at the both ends of the tension side of concrete structure to be reinforced；
2. installing FRP plate device for exerting in the end of concrete structure；
3. by tensioning equipment tensioning FRP plate item, to FRP plate row replacement Prestressing；With FRP plate device for exerting by FRP plate item
Both ends be respectively pressed into the end grooves at concrete structure both ends, into end grooves and the corresponding end grooves of concrete structure
Between surface filling adhesive；
The step 3. in, first bonding is filled on surface into end grooves and between the corresponding end grooves of concrete structure
Agent, then tensioning, place FRP plate item, then the surface in end grooves and between the corresponding end grooves of concrete structure after
Continuous filling adhesive；Or pretensioning, FRP plate item is placed, then into end grooves and the corresponding end grooves of concrete structure
Between surface filling adhesive；
4. putting tension prestress after to be bonded dose of solidification, FRP plate device for exerting is removed.
Preferably, the step 1. in, surface between end grooves end grooves corresponding with concrete structure it
Between open up inclined lead-over groove, make the slot bottom of end grooves and the surface even transition of concrete structure.
Preferably, the step 1. in, after opening up end grooves and lead-over groove, use high pressure air pressure gun remove end grooves, mistake
The interior concrete dust with concrete structural surface of aqueduct, then use washes of absolute alcohol.
Preferably, the step 2. in, FRP plate device for exerting include be symmetricly set on concrete structure end sides
The first angle steel and the second angle steel, the vertical edge of the first angle steel is fixed on concrete structure side to screw rod is worn by the transverse direction
Face, the both ends of the horizontal sides of the first angle steel are respectively fixed with vertical spacing screw rod；The horizontal sides of second angle steel are set in perpendicular
One end to Limit screw far from the first angle steel, the vertical edge of the second angle steel is fitted in concrete structure side and both ends offer
Through-hole is equipped with the steel rider axis across through-hole between second angle steel；It is separately installed at the both ends of the concrete structure
The FRP plate device for exerting.
Preferably, the step 3. in, open up two grooves respectively in the position of concrete structural surface corresponding end slot；
Drive steel rider axis downlink in a groove by downlink of second angle steel on vertical spacing screw rod so that the both ends of FRP plate item by
The compressing of steel rider axis enters in end grooves.
Preferably, the step 3. in, one of groove is located at the intersection of end grooves and lead-over groove, another groove
It is located at close to the position of concrete structure end.
Preferably, the step 3. in, the binder for being filled in end grooves accounts for the 2/3 of end grooves volume, is applied to
The adhesive thickness on the surface between the corresponding end grooves of concrete structure is 2mm.
Preferably, the step 4. in, the binder solidified under the time room temperature finished as 7 days.
The beneficial effects of the present invention are: being got rid of the invention comprehensively utilizes the advantage of surface mount FRP and surface mounted FRP
The shortcomings that having abandoned them applies the mechanical property that prestressing force can make full use of reinforcement material high-strength to FRP, and consolidation effect is good；Nothing
It need to be smaller to the destruction of existing structure along the elongated fluting of concrete structure so that easy construction is easy；The end of FRP plate item is embedded in
In slot, stripping damage can be effectively suppressed；Binder in end grooves plays the role of anchorage, can anchor and be applied to the pre- of FRP
Stress significantly reduces engineering cost.
Detailed description of the invention
Fig. 1 is the flow diagram of reinforcement means of the present invention；
Fig. 2 is using schematic three dimensional views of the method for the present invention in specific example；
Fig. 3 is using to be reinforced beam end schematic three dimensional views of the method for the present invention in specific example；
Fig. 4 is using schematic view of the front view of the method for the present invention in specific example；
Fig. 5 is using overlooking structure diagram of the method for the present invention in specific example；
Fig. 6 is using side structure schematic view of the method for the present invention in specific example.
1, to reinforcement；2, end grooves；3, lead-over groove；4, FRP plate item；5, the first angle steel；6, the second angle steel；7, steel rider
Axis；8, laterally to wearing screw rod；9, vertical spacing screw rod；10, nut.
Specific embodiment
The present invention is described in further details below with reference to the drawings and specific embodiments.
As shown in figures 1 to 6, the present invention is based on the concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end, steps
Suddenly are as follows:
(1) it slots；
By taking concrete structure to be reinforced is to reinforcement 1 as an example.Using groover to the predetermined of 1 tension side both ends of reinforcement
Several end grooves 2 are symmetrically opened up at position along center line, open up inclination between end grooves 2 and interlude to reinforcement 1
Lead-over groove 3,3 bottom of lead-over groove is polished flat using sander, wherein end grooves 2 and the spacing of lead-over groove 3, length and ruler
It is very little to be determined according to the rigidity, the prestressed size of application and correlative study specification of size, FRP plate item 4 to reinforcement 1.
(2) FRP plate device for exerting is installed；
In the present embodiment, FRP plate device for exerting is the tool that will be applied with prestressed FRP plate item 4 and be pressed into end grooves 2,
It include the first angle steel 5, the second angle steel 6, steel rider axis 7, laterally to wearing screw rod 8, vertical spacing screw rod 9 and nut 10 thereon.
For to reinforcement 1, using electric hammer in the side pre-position of beam-ends to be reinforced to punching is worn, and in 5 He of the first angle steel
It is respectively provided with pre-drilled cavity on the both sides of second angle steel 6, passes through the consolidating on one side by the first angle steel 5 to reinforcement 1 to screw rod 8 is worn with transverse direction
Due to reinforcement 1 two sides (when beam section width it is larger it is appropriate to the occasion using chemical bolt replacement laterally to wearing screw rod), will be vertical
One end of Limit screw 9 is fixed at the pre-drilled cavity of 5 another side of the first angle steel and is inserted in the second angle steel 6 in the other end.To be added
Gu the FRP plate device for exerting is installed at the both ends of beam 1 respectively.
(3) bonding agent is filled；
Using high pressure air pressure gun and the cleaning of steel fibre brush to the dust particles in 1 tension side surface of reinforcement and slot, with acetone or wine
The volatile innocuousness solution cleaning such as essence is to reinforcement tension side surface and slot inner surface and dries, and 2/3rds are filled into slot
The binder of volume smears about 2mm thickness binder in beam tension side surface.
(4) 4 both ends of FRP plate item are pressed into slot by tensioning FRP plate item 4；
The prestressing force size reasonable applied according to correlative study specification and design selects FRP plate size, with related tensioning equipment
It is close to accurately apply FRP plate item 4 design prestress value to 1 tension side surface of reinforcement.
Two grooves are opened up respectively in the position of concrete structural surface corresponding end slot 2, and one of groove is located at end
The intersection of portion's slot and lead-over groove, another groove are located at close to the position of concrete structure end.It is opened in the second the pre- of angle steel 6
Steel rider axis 7 is inserted into hole, turning the nut 10 on vertical spacing screw rod makes 6 downlink of the second angle steel, to drive steel rider axis 7 recessed
Downlink in slot should ensure that during this second angle steel 6 everywhere so that 4 both ends of FRP plate item are entered in slot by the compressing of steel rider axis 7
Steel rider axis 7 pushes simultaneously, and push terminal is advisable so that 4 upper and lower gap of FRP plate item is equal, when FRP plate item 4 is depressed into designated position to
Filling adhesive and smooth out surface in slot.
(5) binder solidifies；
The FRP used in the present invention is reinforced under adhesive special room temperature and is conserved by Related product requirement, reaches specified intensity
It needs 7 days, can suitably shorten under high temperature, should should be appropriately extended using necessary thermostatic curing and solidification under low temperature.
(6) it puts and opens；
After bonding agent solidification, which finishes, reaches intensity, prestressing force that release tensioning equipment generates FRP plate item simultaneously removes FRP plate item
Device for exerting, it is careful to knock out steel rider axis 7 and in gap location filling adhesive.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (8)
1. a kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end, which is characterized in that step are as follows:
1. slotting, the identical end grooves of quantity are symmetrically opened up at the both ends of the tension side of concrete structure to be reinforced；
2. installing FRP plate device for exerting in the end of concrete structure；
3. by tensioning equipment tensioning FRP plate item, to FRP plate row replacement Prestressing；With FRP plate device for exerting by FRP plate item
Both ends be respectively pressed into the end grooves at concrete structure both ends, into end grooves and the corresponding end grooves of concrete structure
Between surface filling adhesive；
The step 3. in, first bonding is filled on surface into end grooves and between the corresponding end grooves of concrete structure
Agent, then tensioning, place FRP plate item, then the surface in end grooves and between the corresponding end grooves of concrete structure after
Continuous filling adhesive；Or pretensioning, FRP plate item is placed, then into end grooves and the corresponding end grooves of concrete structure
Between surface filling adhesive；
4. putting tension prestress after to be bonded dose of solidification, FRP plate device for exerting is removed.
2. a kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end as described in claim 1, feature exist
In, the step 1. in, opened up between the surface between end grooves end grooves corresponding with concrete structure inclined
Lead-over groove makes the slot bottom of end grooves and the surface even transition of concrete structure.
3. a kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end as claimed in claim 2, feature exist
In, the step 1. in, after opening up end grooves and lead-over groove, remove end grooves using high pressure air pressure gun, in lead-over groove and coagulation
The concrete dust on soil structure surface, then use washes of absolute alcohol.
4. a kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end as described in claim 1, feature exist
In, the step 2. in, FRP plate device for exerting include be symmetricly set on concrete structure end sides the first angle steel and
The vertical edge of second angle steel, the first angle steel is fixed on concrete structure side to screw rod is worn by the transverse direction, the first angle steel
The both ends of horizontal sides are respectively fixed with vertical spacing screw rod；It is separate that the horizontal sides of second angle steel are set in vertical spacing screw rod
One end of first angle steel, the vertical edge of the second angle steel is fitted in concrete structure side and both ends offer through-hole, and described second
The steel rider axis across through-hole is equipped between angle steel；The FRP plate item is separately installed at the both ends of the concrete structure
Device for exerting.
5. a kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end as claimed in claim 4, feature exist
In, the step 3. in, open up two grooves respectively in the position of concrete structural surface corresponding end slot；Pass through the second angle steel
Downlink on vertical spacing screw rod drives steel rider axis downlink in a groove, so that compressing of the both ends of FRP plate item by steel rider axis
Into in end grooves.
6. a kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end as claimed in claim 5, feature exist
In, the step 3. in, one of groove is located at the intersection of end grooves and lead-over groove, another groove is located at close to coagulation
The position of soil structure end.
7. a kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end as described in claim 1, feature exist
In, the step 3. in, when first filling adhesive, the binder for being filled in end grooves accounts for the 2/3 of end grooves volume, applies
The adhesive thickness for smearing the surface between the corresponding end grooves of concrete structure is 2mm.
8. a kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end as described in claim 1, feature exist
In, the step 4. in, it is 7 days that the binder, which solidifies under the time room temperature finished,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910608577.3A CN110438910B (en) | 2019-07-08 | 2019-07-08 | Concrete structure reinforcing method with end embedded with prestressed FRP (fiber reinforced Plastic) strip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910608577.3A CN110438910B (en) | 2019-07-08 | 2019-07-08 | Concrete structure reinforcing method with end embedded with prestressed FRP (fiber reinforced Plastic) strip |
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| CN110438910A true CN110438910A (en) | 2019-11-12 |
| CN110438910B CN110438910B (en) | 2021-01-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111535206A (en) * | 2020-05-14 | 2020-08-14 | 长沙理工大学 | Construction method and construction system for FRP reinforcement |
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| KR100653632B1 (en) * | 2006-01-18 | 2006-12-05 | 한국건설기술연구원 | Strengthening method for concrete structures with prestressed near surface mounted fiber reinforced polymer composites |
| CN102425311A (en) * | 2011-09-05 | 2012-04-25 | 长沙理工大学 | Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) |
| CN105569372A (en) * | 2016-02-04 | 2016-05-11 | 广东工业大学 | Device and method for enhancing composite reinforced concrete through prestress fiber |
| CN105952180A (en) * | 2016-05-31 | 2016-09-21 | 广东工业大学 | Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method |
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2019
- 2019-07-08 CN CN201910608577.3A patent/CN110438910B/en active Active
Patent Citations (4)
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| KR100653632B1 (en) * | 2006-01-18 | 2006-12-05 | 한국건설기술연구원 | Strengthening method for concrete structures with prestressed near surface mounted fiber reinforced polymer composites |
| CN102425311A (en) * | 2011-09-05 | 2012-04-25 | 长沙理工大学 | Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) |
| CN105569372A (en) * | 2016-02-04 | 2016-05-11 | 广东工业大学 | Device and method for enhancing composite reinforced concrete through prestress fiber |
| CN105952180A (en) * | 2016-05-31 | 2016-09-21 | 广东工业大学 | Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method |
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Cited By (1)
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| CN111535206A (en) * | 2020-05-14 | 2020-08-14 | 长沙理工大学 | Construction method and construction system for FRP reinforcement |
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