CN202787050U - Novel prestress carbon fiber sheet anchor device - Google Patents

Abstract

The utility model relates to a device for reinforcing a concrete beam through prestress carbon fiber sheets, in particular to a novel prestress carbon fiber sheet anchor device. Firstly, two channel steel counter-force beams are arranged on a beam bottom in the transverse direction of a bridge, a piece of channel steel is arranged on the beam bottom in the longitudinal direction of the bridge, and the two channel steel counter-force beams and the piece of channel steel form a counter-force frame device. In structural reinforcement, one end of a carbon fiber sheet is anchored on an end of a to-be-reinforced concrete beam to serve as a fixing end, before pulling, a layer of carbon fiber special glue is firstly coated on the surface of concrete, a steel anchor plate is adhered to a pulling end of the carbon fiber sheet, a pressure sensor and a propulsion bolt system are installed on the carbon fiber sheet for pulling, when control stress is reached, cloth strips at the pulling end are cut off after the adhesion glue is solidified, and eventually an anchor bolt system and the counter-force frame system device are disassembled. The device is simple, convenient and easy to operate, and convenient to widely popularize and use in reinforcement of the concrete beam; and due to the fact that stress delay caused by secondary stress is avoided, tensile strength of the carbon fiber sheet can be fully used, and stress performance of the beam is thereby improved.

Description

A kind of novel pre-stressed carbon cloth anchor device

Technical field

The utility model relates to a kind of technical field of external prestressing strengthening bridge construction, is a kind of device and application of prestressed carbon cloth reinforced concrete beam web specifically.

Background technology

In recent years, traffic volume of highway constantly increases, the road bridge load increases the weight of day by day, and highway bridge originally is subject to some unmanageable unfavorable factors impacts in work progress, in building up operation, be subject to again the impact of environmental factor, even suffer from the effect of the incidental loads such as earthquake, bump, so that the contradiction of load carrying capacity of bridge and transport need.In the bridge testing process, find the most normal reinforced concrete beams of active service and its girder web plate generation crack disease of prestressed steel reinforced concrete beam bridge, below concise and to the point introduction the beam bridge disease phenomenon of several typical section patterns:

1) the prestressed concrete continuous box girder bridge is as one of important bridge type in the highway bridge system, in use also find many sick places, the diagonal crack that its median ventral plate occurs is the typical disease phenomenon, the web diagonal crack general main be distributed in 1/8 stride and 3/4 stride between, symmetrical along the span centre arranged on left and right sides, mostly be 15 ° ~ 50 ° with horizontal sextant angle.Analyze its mainly produce former because: the maximum principal tensile stress of web surpasses concrete tensile strength or anti-shear strength deficiency;

2) T web crack disease mainly contains two kinds of forms, its origin cause of formation is not identical yet: the regular crack that presents on (1) whole web: its form of this crack is generally up/down perforation and presents regular crack at whole web, generally at 1.8 ~ 2.2m together, its reason be concrete when reaching uniform temperature, concrete expanding stress begins to disappear and concrete begins to shrink and produce; (2) after the stretch-draw T beam from the 1m left and right sides, end web Cracks In Upper: the reason of its cracking mainly is that super stretch-draw is excessive when applying prestressing force, causes web top tensile stress is surpassed concrete tensile stress and produces;

3) its web diagonal crack of prestressed cored slab is positioned at beam-ends near near the fulcrum, many and the beam slab left and right sides at 45 ° angle, be obliquely extended to individually base plate, in web bottom and the longitudinal development of base plate junction, or extend upwardly to top board, be communicated with the longitudinal crack between the web top board, crack width is between 0.1～1.0 mm.

The reinforcement means of outer subsides carbon fiber is because corrosion-resistant, and convenient and quick construction, deadweight be little, do not take the advantage such as usage space and become an emerging reinforcing technique.At present, carbon fiber (CFRP) cloth is because its excellent mechanical property has been widely used in the structural strengthening field.For above-mentioned case web disease and mechanism of production thereof, adopt outer fit External prestressed carbon cloth can effectively improve stress in the web, improve the rigidity of structure, prevent that the crack from further carrying out.Prestressed carbon cloth reinforced flexural member has developed three kinds of prestress systems at present:

1) allowed flexural member play antiarch before pasting non-prestressed cloth, then affixing carbon fabric discharges antiarch, thereby so that cloth produces prestressing force.The stress distribution that this kind method produces is lower;

2) by the pre-pretensioning cloth of outside reaction frame, then paste on the member of reinforcing, after maintenance is complete, cut off cloth at component ends and put, strenthening member is applied prestressing force;

3) in strenthening member permanent ground tackle is set, cloth is carried out stretch-draw with strenthening member itself as reaction frame, sticks on the member after stretch-draw is complete, and ground tackle is retained in original position.

Summary of the invention

The purpose of this utility model is for the typical crack disease for the concrete beam web, simultaneously only could participation work when the secondary loading in order to overcome conventional carbon cloth method of attaching, bearing capacity improves not obvious, material property and brings into play few shortcoming, and a kind of novel pre-stressed carbon cloth anchor device is provided.

For achieving the above object, the present invention solves the technical scheme that these technical problems adopt and is:

A kind of device of novel pre-stressed Concrete Beams Strengthened with CFRP, it is characterized in that setting up reaction rack equipment at the case beam body that is reinforced, carbon cloth is posted at the place of polishing at case web 1, flat anchor slab 2 and crab-bolt 3 are fixed on case beam body both sides with an end of carbon fiber, carbon cloth press strip 4 one ends stick on flat anchor slab lower edge, the other end then sticks on the steel anchor slab 6, at steel anchor slab 6 welding augering screws 7.

Further, technical solutions of the utility model are to realize by the following method:

A) set up reaction rack equipment at case Liang Dibanchu;

B) to the polishing of beam surface, the cleaning of stickup prestressed carbon cloth, require to grind fresh, and guarantee that the stickup planeness reaches corresponding code requirement;

C) cleaning sticking veneer application strong blowing device or dust catcher are removed surface dust, wipe clean the surface with acetone again;

D) concrete surface after polishing is if there is recess to use the repair sheets levelling; The corner location for paste will be polished into circular-arc, and arc radius should be not less than 20mm;

E) with the carbon cloth that cuts, use the carbon fiber special glue, flat anchor slab and crab-bolt are fixed carbon cloth one end, and the other end is then pasted the steel anchor slab, as stretching end;

F) web surface brushing cementing agent, after stretching end was in place, the setting pressure sensor by swivel bolt, drove the stretching end reach, thereby makes carbon cloth obtain tensile stress;

G) continuous roll extrusion carbon cloth in the stretch-draw makes the abundant impregnation of carbon fibers cloth of glue, after the glue sclerosis, pulls down counterforce device.

The utility model compared with prior art, simple in structure, novel, easy to use, safe and reliable, effectively improved case web stress performance, solved the phenomenon of Lack of support, and take full advantage of carbon fibre material tensile strength highland characteristic, at utmost bring into play material property, therefore save material, reduce cost.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the utility model cross-sectional configuration schematic diagram;

Fig. 3 is carbon cloth tensioning system structural representation of the present utility model.

Appointment Fig. 1 is Figure of abstract

Among Fig. 1 and 2: 1. case web, 2. flat anchor slab, 3. crab-bolt, 4. carbon cloth press strip, 5. carbon cloth, 6. steel anchor slab, 7. screw rod, 8. pressure sensor, 9. bolt, 10. channel-section steel reaction beam, 11. channel steel cross beams, 12. pressure reading instrument.

The specific embodiment

Be described further this use is novel by reference to the accompanying drawings.Comprise among the figure: case web 1, flat anchor slab 2, crab-bolt 3, carbon cloth press strip 4, carbon cloth 5, steel anchor slab 6, screw rod 7, pressure sensor 8, bolt 9, channel-section steel reaction beam 10, channel steel cross beam 11, pressure reading instrument 12.

Referring to Fig. 1, Fig. 2 and Fig. 3, a kind of novel pre-stressed carbon cloth anchor device, set up reaction rack equipment at the case beam body that is reinforced, then carbon cloth is posted at the place of polishing of the case web 1 that is reinforced, flat anchor slab 2 and crab-bolt 3 are fixed on case beam body both sides with an end of carbon fiber, as fixed end.In addition, at flat anchor slab lower edge affixing carbon fabric press strip 4.The other end then sticks on the steel anchor slab 6, after the glue curing, and at steel anchor slab 6 welding augering screws 7, as stretching end.Web surface is coated cementing agent, after stretching end is in place, and setting pressure sensor 8 and push bolt 9, the rotation push bolt drives the stretching end reach, thereby makes carbon cloth 5 obtain tensile stress.Continuous roll extrusion carbon cloth in the stretch-draw so that the abundant impregnation of carbon fibers cloth of glue, after stretch-draw is finished, treats that the glue sclerosis finishes, and scissors removes the end carbon cloth, thereby so that carbon cloth obtains prestressing force, participates in the stressed of member directly.

Claims (1)

1. novel pre-stressed carbon cloth anchor device, it is characterized in that setting up reaction rack equipment at the case beam body that is reinforced, carbon cloth is posted at the place of polishing at case web (1), flat anchor slab (2) and crab-bolt (3) are fixed on case beam body both sides with an end of carbon fiber, carbon cloth press strip (4) one ends stick on flat anchor slab lower edge, the other end then sticks on the steel anchor slab (6), at steel anchor slab (6) welding augering screw (7).

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