CN102733618B - Device and method for reinforcing concrete beams by prestressing fiber reinforce plastic (FRP) cloth material - Google Patents
Device and method for reinforcing concrete beams by prestressing fiber reinforce plastic (FRP) cloth material Download PDFInfo
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- CN102733618B CN102733618B CN201210180910.3A CN201210180910A CN102733618B CN 102733618 B CN102733618 B CN 102733618B CN 201210180910 A CN201210180910 A CN 201210180910A CN 102733618 B CN102733618 B CN 102733618B
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Abstract
The invention discloses a device and a method for reinforcing concrete beams by prestressing fiber reinforce plastic (FRP) cloth material. A Chute is arranged at two side walls of a shell body of the reinforcing device, a fixed axis of cloth material and a stressing threaded rod equipped with a pull rod are arranged up and down and fixed at a sliding block and the sliding block can slide up and down along the chute; a guide axis is in axial connection with the top of two side walls of the shell body by a fixing plate and can move parallelly along the direction perpendicular to principal plane. During fixing, the FRP cloth material is adhered to the bottom of one end of the beam to be reinforced and fixed; the opening of the fixing device is directed to the bottom of the beam to be reinforced or the inner side wall of a concrete column and fixed; the stressing threaded rod is installed; the FRP cloth material is wound at the fixing axis; the guide axis is installed and pressed backwards to cause the FRP cloth material to be closely pressed against the surface of the beam; a nut at the push rod is screwed in; prestress is applied to the FRP cloth material until the prestress achieves the preset value and then the FRP cloth material is adhered to the surface of the beam; and after the glue is dry, the nut is screwed out to cut off the FRP cloth material. By applying deformation prestress to reinforce the beam, the bearing capacity of the beam is improved.
Description
Technical field
The present invention relates to a kind of method and bracing means for adopting pre-stress FRP cloth material to reinforce reinforced concrete beam, belong to civil engineering structure strengthening and reforming, prestressed Construction Technology field.
Background technology
Concrete structure is most widely used form of structure in civil engineering.Due to the increase of load in structure,, the reason such as the error of the change of structural use or structure design, structure be aging, increasing concrete structure need to be reinforced, and to improve durability or the ultimate bearing capacity of structure, wherein concrete beam is reinforced the most general.FRP(fibre reinforced composites) there is the higher ratio of strength to weight, good anti-fatigue performance and excellent decay resistance, become one of main reinforcement material of concrete beam at present.When non-prestressed FRP cloth material sticks on strength deficiency or the tension face of the concrete component having destroyed; although flexural strength is improved; but in the larger region of shearing, conventionally can there is peeling off and delamination failure of FRP cloth material, make the destruction of member show the feature of brittle fracture.And, during field-hardened, often for carrying, reinforces by band, there is larger response lag phenomenon, and cause the high strength of FRP material not make full use of.Affected the consolidation effect of FRP.
By FRP cloth material is applied to prestressing force, can better utilize the performance of material.But prestressing force cloth material appointment without bonded areas, cut off to discharge prestressing force time, owing to belonging to, in high-strain-rate situation, implement, may cause FRP cloth material to be peeled off too early, therefore need to adopt reasonable anchoring process.
FRP is applied to prestressing force and need to use special equipment.Not yet have at present ripe be applicable to on-the-spot application FRP is applied to prestressed method and apparatus, mostly the construct inconvenience, equipment of existing method is heavy.
Summary of the invention
The shortcoming that exists intensity not make full use of when overcoming the material reinforced concrete beam of existing high-performance fiber class, the object of the present invention is to provide a kind of concrete beam pre-stress FRP cloth material reinforcement means, there is easy construction, feature that cost is low, reduce the processing requirements to concrete beam surface.
Another object of the present invention is to provide a kind of concrete beam pre-stress FRP cloth material bracing means.
The technical scheme that the present invention addresses the above problem is:
Concrete beam pre-stress FRP cloth material bracing means, the uncovered housing that comprises a side opening, in housing two side, chute is set, the two ends of cloth material fixed axis, afterburning screw rod are fixed on slide block through being to distribute up and down after chute respectively, and slide block can slide up and down along chute; At afterburning screw rod middle part, be provided with downward pull bar, pull bar stretches out housing through housing base plate, on the pull bar outside housing, is provided with nut; Top that two fixed head rear axles are connected on housing two side is inserted respectively at the two ends of the axis of guide makes the axis of guide can be along the direction parallel perpendicular to paper.
Aforesaid concrete beam pre-stress FRP cloth material bracing means, cloth material fixed axis is axially put together by two and half circular shafts of dividing equally along diameter of section.
Concrete beam pre-stress FRP cloth material reinforcement means, comprises the following steps:
(1) use cementing agent FRP to be sticked on to the bottom for the treatment of reinforcement one end, and fix with U-shaped hoop;
(3) by the shell nozzle of concrete beam pre-stress FRP cloth material bracing means towards the bottom of composite soil beam to be reinforced or the inside wall of concrete column fixing;
(4) install and apply prestressed afterburning screw rod to slide block;
(5) gradation of FRP cloth material is wrapped on half circular shaft of cloth material fixed axis, whole cloth material fixed axis, then cloth material fixed axis is arranged on slide block;
(6) two ends of the axis of guide are connected on to case top through fixed head rear axle, to the direction at housing rear portion, press the axis of guide, the axis of guide presses down FRP cloth material and is close to the surface for the treatment of reinforcement;
(1) screw the nut on pull bar, FRP cloth material is applied to prestressing force, according to formula
wherein F is the prestressing force applying, and δ is pull bar elongation, and L is beam overall length, E
ffor the modulus of elasticity of FRP cloth, S
ffor the cross sectional area size of FPR cloth, by controlling the downward displacement of pull bar, control prestressed size, after being applied to predetermined prestressing force, with cementing agent, FRP cloth material is sticked on to the surface of beam, after treating that glue is dry, unscrew nut and cut off FRP cloth material.
Beneficial effect: device of the present invention is small, lightweight, is easy to install, and load application is easy and convenient.Take reinforcing prop surface as counter-force fulcrum, adopt method for stretching in advance to apply pretension, overcome the drawback that prior art can not make full use of intensity.With conventional reinforcement means, compare, the method has strengthened the ductility of reinforcement, has improved its supporting capacity, and reduces amount of deflection, suppresses the development in crack, delays the generation of cracking.
Accompanying drawing explanation
Fig. 1 is the three-dimensional perspective of concrete beam pre-stress FRP cloth material bracing means of the present invention;
Fig. 2 is the Knock-Down Component schematic diagram of concrete beam pre-stress FRP cloth material bracing means of the present invention;
Fig. 3 is a kind of mode of occupation schematic diagram of concrete beam pre-stress FRP cloth material bracing means of the present invention;
Fig. 4 is the another kind of mode of occupation schematic diagram of concrete beam pre-stress FRP cloth material bracing means of the present invention.
In figure: housing-1, chute-2, cloth material fixed axis-3, afterburning screw rod-4, pull bar-5, nut-6, slide block-7, the axis of guide-8, fixed head-9, treat reinforcement-10, concrete column-11, FRP-12.
The specific embodiment
Below in conjunction with accompanying drawing and example, the present invention is further described.
Fig. 1 is the three-dimensional perspective of concrete beam pre-stress FRP cloth material bracing means of the present invention, Fig. 2 is the Knock-Down Component schematic diagram of concrete beam pre-stress FRP cloth material bracing means of the present invention, with reference to Fig. 1, shown in 2, concrete beam pre-stress FRP cloth material bracing means A, housing 1 one side openings, and uncovered, material is stainless steel, relative two side arranges chute 2, cloth material fixed axis 3 and fixing through chute 2 use slide blocks 7 for applying prestressed afterburning screw rod 4, slide block can slide up and down along chute, the direction contrary with cloth material fixed axis at the middle part of afterburning screw rod 4 is provided with pull bar 5, pull bar 5 stretches out housing through housing base plate, pull bar is provided with nut 6, by screwing nut, pull pull bar under can looking like, drive fixed block moves down, and then cloth material fixed axis moves down, tension FRP cloth material.In order to prevent that FRP cloth material from skidding on cloth material fixed axis, cloth material fixed axis is axially put together by two parts of dividing equally along diameter of section, when FRP cloth material is fixed on cloth material fixed axis, a FRP cloth material part first in office need be wound around, be wound around again a few after then two parts being merged into complete cloth material fixed axis.The two ends of the axis of guide 8 are coupling at the top of housing two side after inserting respectively two fixed heads 9, make the axis of guide 8 can be along the direction parallel perpendicular to paper, and then can make FRP cloth material be close to the surface for the treatment of reinforcement.
Fig. 3 is a kind of mode of occupation schematic diagram of concrete beam pre-stress FRP cloth material bracing means of the present invention, and Fig. 4 is by the another kind of mode of occupation schematic diagram of concrete beam pre-stress FRP cloth material bracing means of the present invention.With reference to Fig. 3,4, while adopting device of the present invention to carry out concrete beam reinforcing, can install opening towards the inside wall (Fig. 4) of the bottom of composite soil beam 10 to be reinforced (Fig. 3) or concrete column 11, specifically comprise the following steps:
(1) use cementing agent FRP12 to be sticked on to the bottom for the treatment of reinforcement 10 one end, and fix with U-shaped hoop;
(2) install and apply prestressed afterburning screw rod to slide block;
(3) FRP cloth material is first wrapped in to half part of cloth material fixed axis, then is wrapped on whole cloth material fixed axis, then cloth material fixed axis is arranged on slide block;
(4) guiding steel axle is coupling in case top by fixed head, to the direction at housing rear portion, presses the axis of guide, the steel axial compression FRP cloth material that leads makes it be close to the surface for the treatment of reinforcement;
(5) revolve the nut on pull bar, FRP cloth material is applied to prestressing force, according to formula, by controlling the downward displacement of pull bar, control prestressed size, after being applied to predetermined prestressing force, with cementing agent, FRP cloth material is sticked on to the surface of beam, after treating that glue is dry, unscrew nut and cut off FRP cloth material.
Example:
To apply FRP prestressing force by this bracing means, reinforce and do not apply two kinds of beams that prestressing force reinforces and carry out aspect of performance comparison now.The sectional dimension of beam is that 500mm(is high) * 300mm(is wide), long 6500mm, calculates across footpath 6m.Beam top arrangement of reinforcement is three grades of hot-rolled reinforced bars of 5 diameter 20mm, sectional area=1571mm
2, stirrup is the grade III steel of diameter 10mm, concrete strength grade is C50.Carbon cloth performance indications:
In pre-stress FRP is reinforced, δ is 28.12mm, according to formula ε=δ/L, F=E
f* S
f* δ/L calculates FRP prestretching strain stress=4686 μ ε, FRP pre-tensile stress σ=1078Mpa, FRP pretension N=45kN.By analysis of experiments, obtain, pre-stress FRP reinforcement means is compared with common FRP reinforcement means, and cracking load improves 38.24%, and yield load improves 26.2%, and ultimate load improves 21.2%; Member amount of deflection reduces approximately 20%.
Claims (4)
1. concrete beam pre-stress FRP cloth material bracing means, it is characterized in that comprising the uncovered housing of a side opening, in housing two side, chute is set, the two ends of cloth material fixed axis, afterburning screw rod are fixed on slide block through being to distribute up and down after chute respectively, and slide block can slide up and down along chute; Cloth material fixed axis is axially put together by two and half circular shafts of dividing equally along diameter of section; At afterburning screw rod middle part, be provided with downward pull bar, pull bar stretches out housing through housing base plate, on the pull bar outside housing, is provided with nut; Top that two fixed head rear axles are connected on housing two side is inserted respectively at the two ends of the axis of guide makes the axis of guide can be along the direction parallel perpendicular to paper.
2.
based on claimed in claim 1the reinforcement means of concrete beam pre-stress FRP cloth material bracing means, is characterized in that comprising the following steps:
(1) use cementing agent that FRP cloth material is sticked on to the bottom for the treatment of reinforced concrete beam one end, and fix with U-shaped hoop;
(2) by the shell nozzle of concrete beam pre-stress FRP cloth material bracing means towards treating the bottom of reinforced concrete beam or the inside wall of concrete column fixing;
(3) install and apply prestressed afterburning screw rod to slide block;
(4) FRP cloth material is wrapped on cloth material fixed axis;
(5) two ends of the axis of guide are connected on to case top through fixed head rear axle, to the direction at housing rear portion, press the axis of guide, the axis of guide presses down FRP cloth material and is close to the surface for the treatment of reinforced concrete beam;
(6) screw the nut on pull bar, FRP cloth material is applied to prestressing force, according to formula
, wherein F is the prestressing force applying,
for pull bar elongation, L is concrete beam overall length,
for the modulus of elasticity of FRP cloth material,
for the cross sectional area size of FPR cloth material, by controlling the downward displacement of pull bar, control prestressed size, after being applied to predetermined prestressing force, with cementing agent, FRP cloth material is sticked on to the surface of concrete beam, after treating that glue is dry, unscrew nut and cut off FRP cloth material.
3. concrete beam pre-stress FRP cloth material reinforcement means according to claim 2, it is characterized in that cloth material fixed axis is axially put together by two and half circular shafts of dividing equally along diameter of section, cloth material in step (4) is first wrapped in half circular shaft of cloth material fixed axis, is then wound around whole cloth material fixed axis.
4. concrete beam pre-stress FRP cloth material reinforcement means according to claim 2, is characterized in that prestress control that step (6) applies is in 10% ~ 60% of the FRP cloth material strength of materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210180910.3A CN102733618B (en) | 2012-06-04 | 2012-06-04 | Device and method for reinforcing concrete beams by prestressing fiber reinforce plastic (FRP) cloth material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210180910.3A CN102733618B (en) | 2012-06-04 | 2012-06-04 | Device and method for reinforcing concrete beams by prestressing fiber reinforce plastic (FRP) cloth material |
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| Publication Number | Publication Date |
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| CN102733618A CN102733618A (en) | 2012-10-17 |
| CN102733618B true CN102733618B (en) | 2014-09-10 |
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| CN201210180910.3A Expired - Fee Related CN102733618B (en) | 2012-06-04 | 2012-06-04 | Device and method for reinforcing concrete beams by prestressing fiber reinforce plastic (FRP) cloth material |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102953551B (en) * | 2012-11-27 | 2015-08-26 | 山东大学 | Prestressed carbon cloth reinforced equipment |
| CN106522114B (en) * | 2016-10-28 | 2018-08-28 | 同济大学 | The prestressed reinforcement device of concrete structure is carried out using CFRP cloth materials |
| CN110318558B (en) * | 2019-07-31 | 2023-06-06 | 南方工程检测修复技术研究院 | Prestress application device of prestress FRP reinforced cylindrical structure and construction method thereof |
| CN111946090A (en) * | 2020-08-20 | 2020-11-17 | 上海大学 | CFRP cloth material concrete beam prestressing force reinforcing apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664274A (en) * | 2004-03-04 | 2005-09-07 | 北京特希达科技有限公司 | Prestressed carbon fiber plate stretching method and device |
| CN2771387Y (en) * | 2005-03-02 | 2006-04-12 | 武汉武大巨成加固实业有限公司 | Spiral carbon fiber cloth prestress stretch-draw device |
| CN101713253A (en) * | 2009-10-28 | 2010-05-26 | 江苏省苏科建设技术发展有限公司 | Prestressed carbon cloth reinforced tensioner |
| CN101713252A (en) * | 2009-11-17 | 2010-05-26 | 周劲宇 | Method for reinforcing concrete structure by using prestressed fiber cloth |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2884465B2 (en) * | 1993-12-27 | 1999-04-19 | 東京製綱株式会社 | Terminal fixing structure of FRP reinforcement |
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2012
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664274A (en) * | 2004-03-04 | 2005-09-07 | 北京特希达科技有限公司 | Prestressed carbon fiber plate stretching method and device |
| CN2771387Y (en) * | 2005-03-02 | 2006-04-12 | 武汉武大巨成加固实业有限公司 | Spiral carbon fiber cloth prestress stretch-draw device |
| CN101713253A (en) * | 2009-10-28 | 2010-05-26 | 江苏省苏科建设技术发展有限公司 | Prestressed carbon cloth reinforced tensioner |
| CN101713252A (en) * | 2009-11-17 | 2010-05-26 | 周劲宇 | Method for reinforcing concrete structure by using prestressed fiber cloth |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平7-189427A 1995.07.28 |
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