CN102425311B - 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 PDF

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Publication number
CN102425311B
CN102425311B CN201110259583.6A CN201110259583A CN102425311B CN 102425311 B CN102425311 B CN 102425311B CN 201110259583 A CN201110259583 A CN 201110259583A CN 102425311 B CN102425311 B CN 102425311B
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China
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plate bar
frp
frp plate
concrete
pregroove marks
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CN201110259583.6A
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Chinese (zh)
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CN102425311A (en
Inventor
彭晖
张建仁
刘扬
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长沙理工大学
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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

Based on the concrete structure reinforcement method of Strengthened With Near Surface Mounted pre-stress FRP lath

Technical field

The present invention is mainly concerned with the reinforcing technique field of concrete structure, refers in particular to a kind of method adopting Strengthened With Near Surface Mounted pre-stress FRP lath to carry out reinforced concrete structure.

Background technology

Because environmental attack, load increase, maintain the reasons such as improper, the concrete structure built, sustain damage as bridge, building structure etc. or damage the phenomenon of aggravating further and become increasingly conspicuous, cause serious structural safety hidden danger, threaten the security of the lives and property of people.Therefore novel practical, superior performance and lower-cost structural strengthening technology be applied to and a large amount of namely have concrete structure reinforcement is researched and developed, to improve supporting capacity and the security performance of existing structure, infrastructure construction development is had important practical significance.

Fibre reinforced composites (FRP, Fiber Reinforced Polymer), as a kind of new engineering material, owing to having high-strength mechanical property and excellent endurance quality, have obtained the extensive accreditation of building and transportation industry.Externally bonded FRP reinforcement sheet material reinforced concrete structure technology is a kind of reinforcement means generally adopted both at home and abroad now, because its technique is simple, easy construction, receives the favor of engineering circles.But along with research and apply gos deep into, the defect of externally bonded FRP reinforcement reinforced concrete structure exposes gradually.On the one hand, the modulus of elasticity of FRP and the inharmonic characteristic of the strength of materials make outer subsides technique be difficult to play the high-strength performance of this material; On the other hand, often there is the damage-form that FRP-concrete is peeled off in externally bonded FRP reinforcement ruggedized construction, and this destruction presenting Brittleness causes structure namely to lose supporting capacity before giving full play to FRP material property.

External bonding pre-stress FRP technology be for material modulus in external labeling type FRP reinforcing method and intensity inharmonious, the defect being difficult to play the strength of materials proposes, this technology is passed through FRP plate bar Shi Hanzhang in advance, lath is made to play some strength in advance, thus improve the rate of utilization of strength of material, but this technology fails the stripping problem that thoroughly solves between FRP-concrete; Meanwhile, the cementitiousness provided due to binding resin under external bonding mode is limited, cannot realize the anchoring to pre-stress FRP, must arrange the FRP ground tackle of permanent type in addition, add the cost of applying FRP stabilization works structure.

Summary of the invention

The technical problem to be solved in the present invention is just: the technical problem existed for prior art, the invention provides a kind of concrete structure reinforcement method based on Strengthened With Near Surface Mounted pre-stress FRP lath of with low cost, easy construction, long service life, good reliability.

For solving the problems of the technologies described above, the present invention by the following technical solutions:

Based on a concrete structure reinforcement method for Strengthened With Near Surface Mounted pre-stress FRP lath, the steps include:

fluting; Concrete structure to be reinforced is offered the pregroove marks of one or more;

tensioner and the FRP plate bar fixture of FRP plate bar are installed;

by tensioner and the built-in FRP plate bar of FRP plate bar fixture stretch-draw, built-in FRP plate bar is stretched; Be positioned in pregroove marks by built-in FRP plate bar, fill bonding agent, retaining clip anchor-shaped state a period of time solidifies to make bonding agent;

to put: when bonding agent solidification is complete reach intensity after, tear FRP plate bar fixture open.

As a further improvement on the present invention:

Described step in, described FRP plate bar fixture comprises fixed end FRP plate bar fixture and stretching end FRP plate bar fixture, described fixed end FRP plate bar fixture is fixed on one end of pregroove marks on concrete structure to be reinforced, and described stretching end FRP plate bar fixture and tensioner are fixed on the other end of pregroove marks on concrete structure to be reinforced.

Described step in, after offering pregroove marks, use compressed air to remove concrete dust remaining in pregroove marks, then use washes of absolute alcohol.

Described step in, the volume that filling extent is full of in pregroove marks 2/3rds with bonding agent is advisable.

Described step in, in stretching process, stretch-draw target stress should be greater than 50% of built-in FRP plate bar ultimate tensile strength, and should be less than 80% of built-in FRP plate bar ultimate tensile strength.

Described step after putting an end, inserting epoxy mortar to pregroove marks two ends for the pre-cutter position of installing FRP plate bar fixture, repairing to flushing with the surface of concrete structure former to be reinforced.

Described step in, first in pregroove marks, fill bonding agent, then stretch-draw, place built-in FRP plate bar, then continue to insert bonding agent in pregroove marks, until bonding agent fills up pregroove marks internal cavity and covers built-in FRP plate bar completely; Or, pretensioning, place built-in FRP plate bar, and then fill bonding agent in pregroove marks, until bonding agent fills up pregroove marks internal cavity and covers built-in FRP plate bar completely.

Described tensioner can in described step middle stretch-draw completes and by removing after FRP plate bar fixture anchoring FRP plate bar, also can in described step remove in the lump during middle dismounting FRP plate bar fixture.

Compared with prior art, the invention has the advantages that: the present invention is to the FRP plate bar stress application in advance adopting embedded mode strengthening with external bonding, overcome the FRP strength of materials and the inharmonic chronic illness of modulus of elasticity by prestressing technique, give full play to the high-strength performance of FRP material.The present invention, by offering pregroove marks and utilizing embedding subsides technology to enhance cementitiousness between FRP plate bar and concrete, avoids both stripping damages; Directly utilize the anchoring that the cementitiousness between FRP plate bar and concrete realizes FRP plate bar simultaneously, do not need to arrange permanent ground tackle, provide significant conservation the reinforcement cost of structure.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of reinforcement means of the present invention;

Fig. 2 adopts the main TV structure schematic diagram of the inventive method in embody rule example;

Fig. 3 adopts the plan structure schematic diagram of the inventive method in embody rule example;

Fig. 4 adopts the side-looking structural representation of the inventive method in embody rule example;

Fig. 5 is the sectional structure schematic diagram at A-A place in Fig. 2.

Marginal data:

1, reinforcement is treated; 2, pregroove marks; 3, fixed end FRP plate bar fixture; 4, stretching end FRP plate bar fixture; 5, tensioner; 6, built-in FRP plate bar; 7, jack; 8, load sensor; 9, strain transducer.

Detailed description of the invention

Below with reference to Figure of description and specific embodiment, the present invention is described in further details.

As shown in Fig. 1 ~ Fig. 5, the concrete structure reinforcement method based on Strengthened With Near Surface Mounted pre-stress FRP lath of the present invention, the steps include:

(1), slot;

For concrete structure to be reinforced for treating reinforcement 1.Adopt groover treating that the pregroove marks 2 of one or more is offered in the pre-position on reinforcement 1, the degree of depth of pregroove marks 2, width, length, spacing and quantity are determined by relevant technologies requirement and structural strengthening scheme; And the installation site of FRP plate bar fixture is dug out in advance at pregroove marks 2 two ends.After pregroove marks 2 has been offered, use compressed air to remove concrete dust remaining in pregroove marks 2, then use washes of absolute alcohol, to ensure that the inwall of pregroove marks 2 is without dust, greasy dirt, can form bonds well with bonding agent.

(2), the tensioner of FRP plate bar fixture and FRP plate bar is installed;

In the present embodiment, FRP plate bar fixture is that it comprises fixed end FRP plate bar fixture 3 and stretching end FRP plate bar fixture 4 for keeping the pulling force of FRP and being delivered to the anchoring instrument of inside concrete.The tensioner 5 of FRP plate bar is for Shi Hanzhang value equipment used, produces the relevant numerical value of prestressing force by equipment work stretch-draw.By chemical bolt, fixed end FRP plate bar fixture 3 is fixed on the one end for the treatment of pregroove marks 2 on reinforcement 1, and by chemical bolt, stretching end FRP plate bar fixture 4 and tensioner 5 are fixed on the other end treating pregroove marks 2 on reinforcement 1, thus guarantee that the installation site of FRP plate bar fixture and tensioner 5 can make built-in FRP plate bar 6 be positioned at pregroove marks 2 by after folder anchor.

(3), bonding agent (such as: binding resin or other type structure glue) is filled;

Check pregroove marks 2, ensure that pregroove marks 2 is interior without after dust, greasy dirt, moisture, in pregroove marks 2, insert the bonding agent (binding resin or other type structure glue) prepared in advance.In preferred embodiment, the volume that filling extent is full of in pregroove marks 2 2/3rds with bonding agent is advisable.

(4), the built-in FRP plate bar of stretch-draw;

Built-in FRP plate bar 6 to be positioned in pregroove marks 2 and to be mounted on fixed end FRP plate bar fixture 3, stretching end FRP plate bar fixture 4 and tensioner 5 and complete anchoring; In this process, arrange during built-in FRP plate bar 6 generally occupies in pregroove marks 2, be not namely attached on the inwall of pregroove marks 2, be connected by means of only the inwall of bonding agent with pregroove marks 2, and the height of built-in FRP plate bar 6 is generally not more than the degree of depth of pregroove marks 2.Install jack 7, load sensor 8 and strain transducer 9.By jack 7 pushing tow tensioner 5, the built-in FRP plate bar 6 be anchored in fixture stretches to make it drive.In stretching process, observe the situation of change of load and strain according to " dual control " principle, stretch-draw target stress should not be less than 50% of built-in FRP plate bar 6 ultimate tensile strength, also should not be greater than 80% of built-in FRP plate bar 6 ultimate tensile strength.After reaching target initial stress, by the built-in FRP plate bar 6 of stretching end FRP plate bar fixture 4 anchoring, unloading jack 7, remove ground tackle on tensioner 5, observe and confirm that fixed end FRP plate bar fixture 3, stretching end FRP plate bar fixture 4, built-in FRP plate bar 6 stress keep stable and slippage does not occur, tears, after the abnormal conditions such as fracture, removes tensioner 5, jack 7 and each sensor.In above process, strain transducer 9 can adopt resistance strain gage, and it is the element that the change that mechanical component strains can be converted to resistance variations, coordinates strain gauge, is used for measuring the change that occurs under effect of stress of object.Load sensor 8 can adopt can experience external force and the force snesor converting usable output signal to.

(5), solidify;

Continue to insert the bonding agent prepared in advance in pregroove marks 2, until bonding agent fills up pregroove marks 2 internal cavity and covers built-in FRP plate bar 6 completely, the measures such as Manual pressurizing can certainly be taked further to ensure that above-mentioned bonding agent fills operation.Keep the folder anchor-shaped state of fixed end FRP plate bar fixture 3 and stretching end FRP plate bar fixture 4 to continue for some time, solidify completely to make bonding agent.Such as, environment temperature and adhesive performance can be looked, make its retaining clip anchor-shaped state 3 ~ 7 days.

(6), to put;

When bonding agent solidification complete reach intensity after, make stretching end FRP plate bar fixture 4 occur small distance slide, discharge the prestressing force of built-in FRP plate bar 6.Put close observation concrete-bonding agent interface in a process and whether occur cracking phenomena.Put and opened rear dismounting fixed end FRP plate bar fixture 3, stretching end FRP plate bar fixture 4.Inserting epoxy mortar to pregroove marks 2 two ends for the pre-cutter position of installing FRP plate bar fixture, repairing to flushing with original structure surface.

Be appreciated that in the step of above-described embodiment, the adjustment done on some construction orders also should belong to protection scope of the present invention.Such as, in described step, first to filling adhesive in pregroove marks 2, then stretch-draw, place built-in FRP plate bar 6, then continue to insert bonding agent in pregroove marks 2, until bonding agent fills up pregroove marks 2 internal cavity and covers built-in FRP plate bar 6 completely; Or, pretensioning, place built-in FRP plate bar 6, and then to filling adhesive in pregroove marks 2, until bonding agent fills up pregroove marks 2 internal cavity and covers built-in FRP plate bar 6 completely.Again such as, after the built-in FRP plate bar 6 of pretensioning, more built-in FRP plate bar 6 is positioned in pregroove marks 2; Or, first built-in FRP plate bar 6 is positioned in pregroove marks 2, then stretch-draw.These versions all should belong to protection scope of the present invention.

Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.

Claims (6)

1., based on a concrete structure reinforcement method for Strengthened With Near Surface Mounted pre-stress FRP lath, it is characterized in that step is:
fluting; Concrete structure to be reinforced is offered the pregroove marks (2) of one or more;
tensioner (5) and the FRP plate bar fixture of FRP plate bar are installed;
by tensioner (5) and the built-in FRP plate bar (6) of FRP plate bar fixture stretch-draw, built-in FRP plate bar (6) is stretched; Built-in FRP plate bar (6) is positioned in pregroove marks (2), fills bonding agent, retaining clip anchor-shaped state a period of time Post RDBMS; Described step in, first to filling adhesive in pregroove marks (2), then stretch-draw, place built-in FRP plate bar (6), then continue to insert bonding agent in pregroove marks (2), until bonding agent fills up pregroove marks (2) internal cavity and covers built-in FRP plate bar (6) completely; Or, pretensioning, place built-in FRP plate bar (6), and then to filling adhesive in pregroove marks (2), until bonding agent fills up pregroove marks (2) internal cavity and covers built-in FRP plate bar (6) completely;
to put: when bonding agent solidification is complete reach intensity after, remove FRP plate bar fixture; Described step after putting an end, inserting epoxy mortar to pregroove marks (2) two ends for the pre-cutter position of installing FRP plate bar fixture, repairing to flushing with the surface of concrete structure former to be reinforced.
2. the concrete structure reinforcement method based on Strengthened With Near Surface Mounted pre-stress FRP lath according to claim 1, is characterized in that: described step in, described FRP plate bar fixture comprises fixed end FRP plate bar fixture (3) and stretching end FRP plate bar fixture (4), described fixed end FRP plate bar fixture (3) is fixed on one end of pregroove marks (2) on concrete structure to be reinforced, and described stretching end FRP plate bar fixture (4) and tensioner (5) are fixed on the other end of pregroove marks (2) on concrete structure to be reinforced.
3. the concrete structure reinforcement method based on Strengthened With Near Surface Mounted pre-stress FRP lath according to claim 1, is characterized in that: described step in, after offering pregroove marks (2), use compressed air to remove concrete dust remaining in pregroove marks (2), then use washes of absolute alcohol.
4. the concrete structure reinforcement method based on Strengthened With Near Surface Mounted pre-stress FRP lath according to claim 1, is characterized in that: described step in, the volume that filling extent is full of in pregroove marks (2) 2/3rds with bonding agent is advisable.
5. the concrete structure reinforcement method based on Strengthened With Near Surface Mounted pre-stress FRP lath according to claim 1, is characterized in that: described step in, in stretching process, stretch-draw target stress should be greater than 50% of built-in FRP plate bar (6) ultimate tensile strength, and should be less than 80% of built-in FRP plate bar (6) ultimate tensile strength.
6. the concrete structure reinforcement method based on Strengthened With Near Surface Mounted pre-stress FRP lath according to claim 1, is characterized in that: described tensioner (5) is in described step middle stretch-draw completes and by removing after FRP plate bar fixture anchoring FRP plate bar, or in described step remove in the lump during middle dismounting FRP plate bar fixture.
CN201110259583.6A 2011-09-05 2011-09-05 Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) CN102425311B (en)

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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
EP3690167A1 (en) * 2019-02-01 2020-08-05 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

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CN103388407B (en) * 2013-07-26 2015-07-29 河海大学 The method of top layer prestressing force embedded technology reinforced concrete member and mechanical device
CN105507169B (en) * 2016-01-16 2017-05-24 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
CN105887700B (en) * 2016-04-11 2017-11-24 中交武汉港湾工程设计研究院有限公司 A kind of PC T beam repairs discharge mechanism
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 (3)

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Publication number Priority date Publication date Assignee Title
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
EP3690167A1 (en) * 2019-02-01 2020-08-05 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
WO2020157009A1 (en) * 2019-02-01 2020-08-06 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

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