CN2839431Y

CN2839431Y - Carbon fiber cloth reinforced beam stretch-draw anchoring mechanism

Info

Publication number: CN2839431Y
Application number: CN 200520046882
Authority: CN
Inventors: 顾祥林; 高鹏; 张伟平; 李翔
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2005-11-24
Filing date: 2005-11-24
Publication date: 2006-11-22
Anticipated expiration: 2015-11-24

Abstract

The utility model relates to a stretching and anchoring mechanism for a carbon fiber cloth reinforcement beam, wherein an anchoring device and a stretching mechanism are arranged on a concrete beam; the middle part of angle steel of the anchoring device is provided with a reinforcement rib plate, and the lower part is provided with a bearing plate; each two bars of angle steel correspond to each other; both ends of the concrete beam are fixedly connected with a beam by bolts; anchors are fixedly connected with two upright plates by a bottom plate perpendicularly; a gap is arranged between the upright plates; a piece of CFRP cloth is respectively connected with the bottom plates of the two anchors; the concrete beam is positioned between the two upright plates of the anchors, and the bottom surface of the concrete beam is bonded with the bottom plates of the anchors; each upright plate is fixedly connected with the steel angle respectively; a hoisting jack of the stretching mechanism is positioned on the bearing plate; a pull rod orderly passes through the upright plates of the anchors, the steel angle, the hoisting jack, spacers and a load sensor which are fixed by nuts; the load sensor is connected with a strain box; the hoisting jack is connected with an oil pump and an oil pressure gauge; a press oil pump stretches the CFR cloth, the equipment is disassembled after stretching, the pull rod is fixed by the bolts after the pull rod is pulled out. The anchor has the advantages of simple form, convenient machining, convenient operation of the stretching equipment and easy carrying, and furthermore, the utility model can be used repeatedly.

Description

Carbon cloth reinforced girder tensioning anchoring mechanism

Technical field

The utility model relates to a kind of carbon cloth reinforced girder tensioning anchoring mechanism.

Background technology

Many old buildings are arranged at present, owing to be subjected to the restriction of economy and technical level at that time, bearing capacity is low, durability and poor stability, along with the increase of operating period and the variation of service load, is badly in need of reinforcing, to stop potential safety hazard, increases the service life in when design.Studies have shown that: carbon cloth (CFRP) have the deadweight of intensity height, volume little, need not that pad connects, advantage such as corrosion-resistant.Test shows: when reinforcement yielding, the CFRP sheet material has only been given play to the intensity less than 20%, if the CFRP sheet material is applied pretension, can bring into play high-strength characteristic better; If pretensioned CFRP cloth is pasted on the tension face of concrete beam, can effectively improves the anti-bending bearing capacity and the rigidity of beam, and can control the crack.

Stretching method is that a fixed end and stretch-draw end ground tackle are installed on beam on the beam, CFRP cloth one end is fixed, the other end carries out stretch-draw, though this method construction only needs manpower seldom, but require ground tackle rigidity big and size is little, supporting tensioning equipment needs light and small and exquisite, does not still have mature technique at present and equipment is used in construction.Abroad, the Raafat of the U.S. has developed a cover hydraulic tensioning equipment and an anchor device in 2003, at home, Hunan University develops a cover construction equipment, but this its hydraulic test of two covering devices is all too huge, can't be in real project using, the stretch-draw end has adopted the method for round steel pipe fixation of C FRP cloth in the device that Southeast China University develops, jack pair pull bar with a compact size carries out stretch-draw, but its stretch-draw end device number of spare parts is too many, is unsuitable for promoting.

The emphasis of stretching method exploitation is on the beam: light-duty equipment and few manpower realize that to large scale the pre-stretch-draw CFRP sheet material of multispan degree beam is reinforced with trying one's best; Fixing should have very big strength and stiffness to satisfy the requirement to pre-stretching force and distortion with ground tackle, and ground tackle needs that material is common, processing simply is beneficial to popularization simultaneously; Supporting hydraulic tensioning equipment needs volume little in light weight, so that the construction operation at the bottom of long-distance transport and the beam.

Summary of the invention

For achieving the above object, the utility model proposes a kind of carbon cloth reinforced girder tensioning anchoring mechanism.Be that anchor device and stretch-draw mechanism are installed on reinforcement, on reinforcement, carry out pre-stretch-draw CFRP cloth.Adopt tensioned at one end.

Anchor device comprises angle steel, ground tackle, bolt, pull bar and nut; The angle steel middle part is connected with deep floor, and the bottom is connected with supporting plate, and the two sides all has screw, and angle steel is corresponding in twos, connects firmly with bolt and concrete beam at the two ends of beam; Ground tackle is had between two risers at interval by base plate and two vertical connecting firmly of riser, and screw is arranged on the riser; CFRP cloth is connected with two ground tackle base plates respectively, and the concrete beam that is fixed with angle steel is between two risers of ground tackle, and its bottom surface and ground tackle base plate are fitted, and each ground tackle riser connects firmly with bolt with angle steel respectively; Stretch-draw terminal structure: jack places on the supporting plate, pull bar passes ground tackle riser, angle steel, jack, pad, load sensor successively, fix with nut, load sensor is connected with the strain case through data wire, and jack is connected with oil pressure gauge with oil pump through oil pipe.

Deep floor that designs on the angle steel and supporting plate can play the effect of resistance to deformation and jack supporting plate simultaneously, and angle steel is fixed on the both sides of beam, can play the reaction frame effect, have very big strength and stiffness, to satisfy the requirement to pre-stretching force and distortion.

The stretch-draw anchor mechanism of the utility model design is simple, practical, the ground tackle volume is little, rigidity is big, and tensioning equipment is light small and exquisite, easy to operate, utilizes common hollow hydraulic jack and corresponding ground tackle, can realize stretch-draw and anchoring to CFRP cloth, maximum tension can reach 100kN.

Description of drawings

Below in conjunction with drawings and Examples the present invention is described in detail.

Fig. 1 the utility model mechanism overall schematic;

Fig. 2 CFRP cloth and ground tackle connection diagram;

Fig. 3 angle steel structural representation;

Fig. 4 stretch-draw terminal structure vertical view;

Fig. 5 fixed end vertical view;

Fig. 6 stretch-draw schematic diagram that finishes.

1. concrete beam, 2. support, 3. angle steel, 4. deep floor, 5. supporting plate, 6. bolt, 7. ground tackle base plate, 8. ground tackle riser, 9.CFRP cloth, 10. pull bar, 11. jack, 12. pads, 13. load sensors, 14. nuts, 15. data wires, 16. oil pipes.

The specific embodiment

Will be at the two ends of the concrete beam on the support 21 according to the corresponding in twos angle steel 3 of installing in the position that designs, every pair of angle steel pierces beam section with four bolts 6, there is deep floor 4 at the angle steel middle part, supporting plate 5 is arranged at the bottom, spacing between two ground tackle risers 8 is identical with the concrete beam breadth of section, calculate the use length of CFRP cloth 9, CFRP cloth is connected with stretch-draw end ground tackle base plate 7 with fixed end respectively, concrete beam 1 is between two ground tackle risers 8, make the ground tackle base plate be attached to the bottom surface of concrete beam, each riser of ground tackle connects firmly with angle steel 3 usefulness bolts 6 respectively, at the stretch-draw end, jack is placed on the supporting plate 5, penetrate ground tackle riser 8 successively by pull bar 10 then, angle steel 3, jack 11, pad 12, load sensor 13, fixing with nut 14, load sensor 13 is connected with the strain case through data wire, and jack 11 is connected with oil pressure gauge with oil pump through oil pipe; Pressure oil pump, jack make the oil cylinder jacking, and pull bar drives ground tackle and CFRP cloth, makes CFRP cloth be subjected to stretch-draw, observe the load counter on the strain case, stop pressurization when reaching predetermined pull, tight a bolt, and the dismounting tensioning equipment is extracted pull bar out, the screw bolt.

Its supporting capacity of small-sized hollow jack that this utility model is used is 130kN, and stroke is 76mm, and body height is 184mm, highly is 260mm after the maximum extension, and maximum outside diameter is 69mm, and this kind jack external diameter and body height are all very little, is suitable for operation at the bottom of the beam; Have in light weightly, install easy to carryly, bearing capacity is higher, satisfies characteristics such as stretch-draw needs.

The resistance-strain drawing and pressing type load sensor that adopts, its maximum range is a 50kN power, sensitivity is 0.5%, its data output apparatus adopts the static resistance strain gauge, and on the normal pressure machine, load sensor and data output apparatus are carried out data scaling in advance, when big load, can select the wide range load sensor for use.

The utility model can be widely used in the actual engineering reinforcing to concrete beam.

Claims

1. carbon cloth reinforced girder tensioning anchoring mechanism is that anchor device and stretch-draw terminal structure are installed on the concrete strengthening beam, and anchor device comprises angle steel, ground tackle, screw bolt and nut; Stretch-draw terminal structure comprises jack, pad, load sensor, nut, strain case, oil pump and oil pressure gauge; It is characterized in that:

(1) anchor device: the angle steel middle part is connected with deep floor, and the bottom is connected with supporting plate, and the two sides all has screw, and angle steel is corresponding in twos, connects firmly with bolt and concrete beam at the two ends of concrete beam;

(2) ground tackle is had between two risers at interval by base plate and two vertical connecting firmly of riser, and screw is arranged on the riser; CFRP cloth is connected with two ground tackle base plates respectively; The concrete beam that is fixed with angle steel is fitted with the ground tackle base plate at the bottom of the concrete beam between two risers of ground tackle, and each riser of ground tackle connects firmly with bolt with angle steel respectively;

(3) stretch-draw terminal structure: jack places on the supporting plate, pull bar penetrates ground tackle riser, angle steel, jack, pad, load sensor successively, fix with nut, load sensor is connected with the strain case through data wire, and jack is connected with oil pressure gauge with oil pump through oil pipe.