CN102425311A - Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) - Google Patents
Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) Download PDFInfo
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- CN102425311A CN102425311A CN2011102595836A CN201110259583A CN102425311A CN 102425311 A CN102425311 A CN 102425311A CN 2011102595836 A CN2011102595836 A CN 2011102595836A CN 201110259583 A CN201110259583 A CN 201110259583A CN 102425311 A CN102425311 A CN 102425311A
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Abstract
The invention discloses a concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer), which comprises the steps of: 1, slotting, arranging more than one preformed groove on a concrete structure to be reinforced; 2, installing a tensioning tool of an FRP strip and an FRP strip clamp; 3, tensioning internal FRP strips in the tensioning tool and the FRP strip tool so that the internal FRP strips are tensioned, placing the internal FRP strips in the preformed groove, filling an adhesive, keeping a clamping and anchoring state for a period of time and then curing; and 4, relaxing: when adhesive resin is cured completely to reach the strength, dismantling the FRP strip clamp. The concrete structure has the advantages of low cost, convenience for construction, long service life, good reliability and the like.
Description
Technical field
The present invention is mainly concerned with the consolidation of concrete structure technical field, refers in particular to a kind of method that adopts top layer embedding subsides pre-stress FRP lath to come reinforced concrete structure.
Background technology
Owing to reasons such as environmental attack, load increase, maintenance is improper; The concrete structure of having built; Sustain damage or the phenomenon of damaging further aggravation becomes increasingly conspicuous like bridge, building structure etc., caused serious structural safety hidden danger, the security of the lives and property that is threatening people.Therefore research and develop novel practical, superior performance and lower-cost structural strengthening technology and be applied to a large amount of concrete structure reinforcements that promptly have; To improve the supporting capacity and the security performance of existing structure, the infrastructure construction development is had important practical significance.
Fibre reinforced composites (FRP, Fiber Reinforced Polymer) owing to have high-strength mechanical property and good endurance quality, have obtained the extensive approval of building and transportation industry as a kind of new engineering material.The outer FRP of subsides sheet material reinforced concrete structure technology is a kind of reinforcement means that generally adopts both at home and abroad now, because of its technology is simple, easy construction, has received the favor of engineering circle.But along with research and application are goed deep into, the defective of pasting the FRP reinforced concrete structure outward exposes gradually.On the one hand, the inharmonic characteristic of the modulus of elasticity of FRP and the strength of materials makes the outer difficult technique of pasting to bring into play the high-strength performance of this material; On the other hand, paste FRP ruggedized construction outward and the destruction form that the FRP-concrete is peeled off often occurs, this destruction that presents the fragility characteristic causes structure before giving full play to the FRP material property, promptly to lose supporting capacity.
External stickup pre-stress FRP technology is inharmonious to material modulus in the external labeling type FRP reinforcing method and intensity; The defective that is difficult to bring into play the strength of materials proposes; This technology is through apply prestressing force to the FRP lath in advance; Make lath bring into play certain intensity in advance, thereby improved the rate of utilization of strength of material, but this technology fails thoroughly to solve the problem of peeling off between the FRP-concrete; Simultaneously,, can't realize anchoring, the FRP ground tackle of permanent type must be set in addition, increase the cost of applying FRP stabilization works structure pre-stress FRP because the cementitiousness that binding resin provides under the external bonding method is limited.
Summary of the invention
The technical problem that the present invention will solve just is: to the technical problem that prior art exists, the present invention provides the concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding of a kind of with low cost, easy construction, long service life, good reliability.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding the steps include:
put and opened: when bonding agent solidify finish reach intensity after, tear FRP lath anchor clamps open.
As further improvement of the present invention:
In the said step
; Said FRP lath anchor clamps comprise fixed end FRP lath anchor clamps and stretch-draw end FRP lath anchor clamps; Said fixed end FRP lath anchor clamps are fixed in an end of pregroove marks on the concrete structure to be reinforced, and said stretch-draw end FRP lath anchor clamps and tensioner are fixed in the other end of pregroove marks on the concrete structure to be reinforced.
In the said step
; After offering pregroove marks; Use compressed air to remove concrete dust remaining in the pregroove marks, clean with absolute ethyl alcohol again.
In the said step
, filling extent is full of in the pregroove marks 2/3rds volume with bonding agent and is advisable.
In the said step
; In stretching process; Stretch-draw target stress should be greater than 50% of built-in FRP lath ultimate tensile strength, and should be less than 80% of built-in FRP lath ultimate tensile strength.
After said step
is put an end; Epoxy mortar is inserted in the preparatory cutter position that is used to install FRP lath anchor clamps to the pregroove marks two ends, repair to the flush of concrete structure former to be reinforced.
In the said step
; In pregroove marks, fill earlier bonding agent; Stretch-draw then, the built-in FRP lath of placement; Then in pregroove marks, continue to insert bonding agent, fill up the pregroove marks internal cavity and cover built-in FRP lath fully until bonding agent; Perhaps, pretensioning, the built-in FRP lath of placement, and then in pregroove marks, fill bonding agent, fill up the pregroove marks internal cavity and cover built-in FRP lath fully until bonding agent.
Said tensioner can stretch-draw be accomplished and through removing behind the FRP lath anchor clamps anchoring FRP lath, remove in the lump in the time of also can in said step
, removing FRP lath anchor clamps in said step
.
Compared with prior art; The invention has the advantages that: the present invention is to the FRP lath that adopts embedded mode strengthening with external bonding stress application in advance; Overcome the FRP strength of materials and the inharmonic chronic illness of modulus of elasticity through prestressing technique, given full play to the high-strength performance of FRP material.The present invention has avoided both stripping damages through offering pregroove marks and utilizing embedding subsides technology to strengthen the cementitiousness between FRP lath and the concrete; Directly utilize simultaneously the cementitiousness between FRP lath and the concrete to realize anchoring, permanent ground tackle need be set, significantly practiced thrift the reinforcement cost of structure the FRP lath.
Description of drawings
Fig. 1 is the schematic flow sheet of reinforcement means of the present invention;
Fig. 2 adopts the main TV structure sketch map of the inventive method in concrete application example;
Fig. 3 adopts the plan structure sketch map of the inventive method in concrete application example;
Fig. 4 adopts the side-looking structural representation of the inventive method in concrete application example;
Fig. 5 is the sectional structure sketch map at A-A place among Fig. 2.
Marginal data:
1, treats reinforcement; 2, pregroove marks; 3, fixed end FRP lath anchor clamps; 4, stretch-draw end FRP lath anchor clamps; 5, tensioner; 6, built-in FRP lath; 7, jack; 8, load sensor; 9, strain transducer.
The specific embodiment
Below will combine Figure of description and specific embodiment that the present invention is explained further details.
Like Fig. 1～shown in Figure 5, concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding of the present invention the steps include:
(1), fluting;
With concrete structure to be reinforced for treating that reinforcement 1 is an example.Adopt groover treating that the pre-position on the reinforcement 1 offers the pregroove marks 2 more than, the degree of depth of pregroove marks 2, width, length, spacing and quantity are definite by relevant technologies requirement and structural strengthening scheme; And the installation site of digging out FRP lath anchor clamps in advance at pregroove marks 2 two ends.After pregroove marks 2 is offered completion, use compressed air to remove concrete dust remaining in the pregroove marks 2, clean with absolute ethyl alcohol again, do not have dust, greasy dirt, can form bonds well with bonding agent with the inwall that guarantees pregroove marks 2.
(2), the tensioner of FRP lath anchor clamps and FRP lath is installed;
In the present embodiment, FRP lath anchor clamps are to be used to keep the pulling force of FRP and it is delivered to the anchoring instrument of inside concrete, and it comprises fixed end FRP lath anchor clamps 3 and stretch-draw end FRP lath anchor clamps 4.The tensioner 5 of FRP lath produces the relevant numerical value of prestressing force for being used to apply the used equipment of prestress value through equipment work stretch-draw.Through chemical bolt fixed end FRP lath anchor clamps 3 are fixed in an end of treating pregroove marks 2 on the reinforcement 1; And stretch-draw end FRP lath anchor clamps 4 and tensioner 5 are fixed in the other end of treating pregroove marks 2 on the reinforcement 1, thereby after can making built-in FRP lath 6 by the folder anchors, the installation site of guaranteeing FRP lath anchor clamps and tensioner 5 is positioned at pregroove marks 2 through chemical bolt.
(3), fill bonding agent (for example: binding resin or other type structure glue);
Inspection pregroove marks 2 behind no dust, greasy dirt, the moisture, is inserted the bonding agent (binding resin or other type structure glue) for preparing in advance in the assurance pregroove marks 2 in pregroove marks 2.In preferred embodiment, filling extent is advisable with the volume that bonding agent is full of pregroove marks 2 interior 2/3rds.
(4), the built-in FRP lath of stretch-draw;
Built-in FRP lath 6 is positioned in the pregroove marks 2 and is mounted on fixed end FRP lath anchor clamps 3, stretch-draw end FRP lath anchor clamps 4 and the tensioner 5 accomplish anchoring; In this process, built-in FRP lath 6 generally occupies middle setting in pregroove marks 2, promptly is not attached on the inwall of pregroove marks 2, only be connected through the inwall of bonding agent with pregroove marks 2, and the height of built-in FRP lath 6 generally is not more than the degree of depth of pregroove marks 2.Install jack 7, load sensor 8 and strain transducer 9.Through jack 7 pushing tow tensioners 5, the built-in FRP lath 6 that its drive is anchored in the anchor clamps stretches.In stretching process, observe the situation of change of load and strain according to " two control " principle, stretch-draw target stress should not be less than 50% of built-in FRP lath 6 ultimate tensile strengths, also should be greater than 80% of built-in FRP lath 6 ultimate tensile strengths.After reaching the target initial stress; Through the built-in FRP lath 6 of stretch-draw end FRP lath anchor clamps 4 anchorings; Unloading jack 7; Remove ground tackle on the tensioner 5, observe and confirm that fixed end FRP lath anchor clamps 3, stretch-draw end FRP lath anchor clamps 4, built-in FRP lath 6 stress keep stable and slippage does not take place, tear, after the abnormal conditions such as fracture, remove tensioner 5, jack 7 and each sensor.In said process, strain transducer 9 can adopt resistance strain gage, and it is the element that can the variation of strain on the mechanical component be converted into resistance variations, cooperates strain gauge, is used for measuring the variation that object is taken place under the stress effect.Load sensor 8 can adopt the power sensor that can experience external force and convert usable output signal to.
(5), solidify;
In pregroove marks 2, continue to insert the bonding agent for preparing in advance, fill up pregroove marks 2 internal cavities and cover built-in FRP lath 6 fully, can certainly further take artificial pressurization to wait measure to fill operation to guarantee above-mentioned bonding agent until bonding agent.The folder anchor state continuance a period of time that keeps fixed end FRP lath anchor clamps 3 and stretch-draw end FRP lath anchor clamps 4 is so that bonding agent solidifies fully.For example, can look environment temperature and adhesive performance, make it keep folder anchor state 3～7 days.
(6), put and open;
When bonding agent solidify finish reach intensity after, make stretch-draw end FRP lath anchor clamps 4 that small distances take place and slide, discharge the prestressing force of built-in FRP lath 6.Put whether close observation concrete-bonding agent interface cracking phenomena occurs in the process.Remove fixed end FRP lath anchor clamps 3, stretch-draw end FRP lath anchor clamps 4 after putting a completion.Epoxy mortar is inserted in the preparatory cutter position that is used to install FRP lath anchor clamps to pregroove marks 2 two ends, repair to the original structure flush.
Be appreciated that in the step of the foregoing description the adjustment of doing on some construction orders also should belong to protection scope of the present invention.For example, in the said step, elder generation's filling adhesive in pregroove marks 2, stretch-draw then, the built-in FRP lath 6 of placement then continue to insert bonding agent in pregroove marks 2, fill up pregroove marks 2 internal cavities and cover built-in FRP lath 6 fully until bonding agent; Perhaps, pretensioning, place built-in FRP lath 6, and then in pregroove marks 2 filling adhesive, fill up pregroove marks 2 internal cavities and cover built-in FRP lath 6 fully until bonding agent.Again for example, behind the built-in FRP lath 6 of pretensioning, more built-in FRP lath 6 is positioned in the pregroove marks 2; Perhaps, built-in FRP lath 6 is positioned in the pregroove marks 2 stretch-draw more earlier.These versions all should belong to protection scope of the present invention.
Below only be preferred implementation of the present invention, protection scope of the present invention also not only is confined to the foregoing description, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art some improvement and retouching not breaking away under the principle of the invention prerequisite should be regarded as protection scope of the present invention.
Claims (8)
1. concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding is characterized in that step is:
stretches built-in FRP lath (6) through tensioner (5) and the built-in FRP lath of FRP lath anchor clamps stretch-draw (6); Built-in FRP lath (6) is positioned in the pregroove marks (2), fills bonding agent, keep folder anchor state to solidify after a period of time;
2. concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding according to claim 1; It is characterized in that: in the said step
; Said FRP lath anchor clamps comprise fixed end FRP lath anchor clamps (3) and stretch-draw end FRP lath anchor clamps (4); Said fixed end FRP lath anchor clamps (3) are fixed in an end of pregroove marks on the concrete structure to be reinforced (2), and said stretch-draw end FRP lath anchor clamps (4) and tensioner (5) are fixed in the other end of pregroove marks on the concrete structure to be reinforced (2).
3. concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding according to claim 1; It is characterized in that: in the said step
; After offering pregroove marks (2); Use compressed air to remove concrete dust remaining in the pregroove marks (2), clean with absolute ethyl alcohol again.
4. concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding according to claim 1; It is characterized in that: in the said step
, filling extent is advisable with the volume that bonding agent is full of pregroove marks (2) interior 2/3rds.
5. concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding according to claim 1; It is characterized in that: in the said step
; In stretching process; Stretch-draw target stress should be greater than 50% of built-in FRP lath (6) ultimate tensile strength, and should be less than 80% of built-in FRP lath (6) ultimate tensile strength.
6. concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding according to claim 1; It is characterized in that: after said step
is put an end; Epoxy mortar is inserted in the preparatory cutter position that is used to install FRP lath anchor clamps to pregroove marks (2) two ends, repair to the flush of concrete structure former to be reinforced.
7. concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding according to claim 1; It is characterized in that: in the said step
; Elder generation's filling adhesive in pregroove marks (2); Stretch-draw then, placement built-in FRP lath (6); Then in pregroove marks (2), continue to insert bonding agent, fill up pregroove marks (2) internal cavity and cover built-in FRP lath (6) fully until bonding agent; Perhaps, pretensioning, place built-in FRP lath (6), and then to pregroove marks (2) in filling adhesive, fill up pregroove marks (2) internal cavity until bonding agent and also cover built-in FRP lath (6) fully.
8. concrete structure reinforcement method of pasting the pre-stress FRP lath based on the top layer embedding according to claim 1; It is characterized in that: said tensioner (5) can stretch-draw be accomplished and through removing behind the FRP lath anchor clamps anchoring FRP lath, remove in the lump in the time of also can in said step
, removing FRP lath anchor clamps in said step
.
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| CN201110259583.6A CN102425311B (en) | 2011-09-05 | 2011-09-05 | Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321443A (en) * | 2013-06-14 | 2013-09-25 | 朱奎 | Structural-transformation construction method |
| CN103388407A (en) * | 2013-07-26 | 2013-11-13 | 河海大学 | Method for reinforcing concrete member by adopting surface prestress embedded technology, and mechanical device |
| CN105507169A (en) * | 2016-01-16 | 2016-04-20 | 哈尔滨工业大学 | Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method |
| CN105887700A (en) * | 2016-04-11 | 2016-08-24 | 中交武汉港湾工程设计研究院有限公司 | Pre-stressed concrete T-beam repairing and unloading device |
| 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 |
| CN106012712A (en) * | 2016-07-05 | 2016-10-12 | 北京交通大学 | Reinforcing method of straddle type monorail traffic rail beam |
| CN106149980A (en) * | 2016-08-19 | 2016-11-23 | 广东工业大学 | Embedded wet viscous FRP band reinforced steel concrete rod structure and reinforcement means |
| CN109457991A (en) * | 2018-10-30 | 2019-03-12 | 兰州大学 | A kind of anchoring carbon fiber Strengthened With Near Surface Mounted reinforces the method and application of concrete structure |
| CN110438910A (en) * | 2019-07-08 | 2019-11-12 | 长沙理工大学 | A kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end |
| CN110820603A (en) * | 2019-09-29 | 2020-02-21 | 长沙理工大学 | Bridge vertical prestress loss compensation method based on surface layer embedded prestress lath |
| AU2020214703B2 (en) * | 2019-02-01 | 2021-08-05 | Eidg. Materialprüfungs- Und Forschungsanstalt Empa | Method for strengthening concrete or timber structures using CRFP strips and concrete or timber structures strengthened by this method |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321443A (en) * | 2013-06-14 | 2013-09-25 | 朱奎 | Structural-transformation construction method |
| CN103388407A (en) * | 2013-07-26 | 2013-11-13 | 河海大学 | Method for reinforcing concrete member by adopting surface prestress embedded technology, and mechanical device |
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| CN105507169A (en) * | 2016-01-16 | 2016-04-20 | 哈尔滨工业大学 | Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method |
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| CN106012712A (en) * | 2016-07-05 | 2016-10-12 | 北京交通大学 | Reinforcing method of straddle type monorail traffic rail beam |
| CN106149980A (en) * | 2016-08-19 | 2016-11-23 | 广东工业大学 | Embedded wet viscous FRP band reinforced steel concrete rod structure and reinforcement means |
| CN109457991A (en) * | 2018-10-30 | 2019-03-12 | 兰州大学 | A kind of anchoring carbon fiber Strengthened With Near Surface Mounted reinforces the method and application of concrete structure |
| CN109457991B (en) * | 2018-10-30 | 2021-10-08 | 兰州大学 | Method for embedding reinforced concrete structure on surface layer of anchored carbon fiber |
| AU2020214703B2 (en) * | 2019-02-01 | 2021-08-05 | Eidg. Materialprüfungs- Und Forschungsanstalt Empa | Method for strengthening concrete or timber structures using CRFP strips and concrete or timber structures strengthened by this method |
| US11299895B2 (en) | 2019-02-01 | 2022-04-12 | S&P Clever Reinforcement Company Ag | Method for strengthening concrete or timber structures using CFRP strips and concrete or timber structures strengthened by this method |
| CN110438910A (en) * | 2019-07-08 | 2019-11-12 | 长沙理工大学 | A kind of concrete structure reinforcement method of the embedding patch pre-stress FRP lath in end |
| CN110820603A (en) * | 2019-09-29 | 2020-02-21 | 长沙理工大学 | Bridge vertical prestress loss compensation method based on surface layer embedded prestress lath |
| CN110820603B (en) * | 2019-09-29 | 2021-09-10 | 长沙理工大学 | Bridge vertical prestress loss compensation method based on surface layer embedded prestress lath |
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