CN102926551A - Device and method for reinforcing flexural concrete member - Google Patents

Abstract

The invention relates to a device and a method for strengthening a bending concrete member. The invention makes grooves at both ends of the tensile surface of the reinforced concrete member, pushes the steel plates with reserved holes on the two ends of the member respectively, and stretches the steel hinge line so that the steel plate and the concrete member form a reaction platform; the bonded and clamped fiber The steel fixture at the end of the reinforced composite sheet is embedded in the groove, and the fixture at one end is anchored in the concrete with an anchor bolt, and the fixture at the other end is connected with the bolt and the lap steel block; The bolt is used as a tension rod, and the fiber-reinforced composite material is stretched by a jack; finally, the fiber-reinforced composite material is pasted and the clamp at the tensioning end is anchored in the concrete, and U-shaped hoops are pasted on both ends of the reinforced concrete member. After curing, gradually release the prestressed tension. The invention uses the reinforced concrete member itself as a tensioning reaction force platform, avoids making complicated tensioning devices, and solves the anchoring problem of the prestressed force of fiber reinforced composite materials.

Description

A device and method for strengthening flexural concrete members

technical field

The invention relates to a device and method for strengthening a flexural concrete member, in particular to a device and method for reinforcing a flexural concrete member with a prestressed fiber reinforced composite material sheet, which belongs to the transformation technology of the device and method for strengthening a flexural concrete member .

Background technique

Concrete damage caused by construction defects, corrosion, overloading or fatigue has led to certain safety hazards in structures such as bridges, tunnels, industrial plants and offshore platforms in service. These damaged concrete structures are usually reinforced by means of reinforcement. meet current usage standards. In recent years, fiber-reinforced composite sheets (including plates and cloths) have been widely used in concrete structure reinforcement projects due to their light weight, high stiffness and strength, and strong corrosion resistance and fatigue resistance. However, at present, the fiber-reinforced composite material sheet reinforcement method in the actual reinforcement project mainly adopts the passive reinforcement technology, which mainly has the following disadvantages: the high-strength fiber sheet as a reinforcement material can only be stressed when the reinforced structure is stressed twice , it can gradually play a role after further deformation occurs, so that the strength of the fiber sheet material cannot be fully exerted, and the overall reinforcement efficiency is low; in addition, for the existing damaged concrete structure, this kind of external fiber reinforced composite material sheet reinforcement technology cannot recover Existing damage has limited ability to improve deformation of the original structure.

In order to solve the problems of the above-mentioned passive reinforcement technology, a new technology of strengthening concrete structures with prestressed fiber-reinforced composite material sheets has emerged as the times require. This technology combines the strengths of fiber-reinforced composite sheet bonding and reinforcement with external prestressed tendons, which further improves the reinforcement effect and can better exert the high-strength and tensile properties of fiber sheets. The cracks and deformation have been significantly improved, and the overall reinforcement effect has been significantly improved. In the technology of prestressed fiber-reinforced composite material sheets to strengthen flexural concrete members, the application and anchorage of fiber-reinforced composite material sheet prestress are key issues. At present, the prestressing methods of fiber reinforced composite materials can be divided into indirect method and direct tension method. Among them, the indirect method is usually not used in actual projects due to the small prestress provided; while the existing direct tensioning technology requires a specific device as a tensioning platform, which not only increases the difficulty of construction, but also improves project cost. In addition, although a lot of research has been done on the reinforced structure of prestressed fiber reinforced composite materials at home and abroad, the problem of end anchorage is still not well solved, especially the end anchorage and prestressing are carried out step by step. This increases the workload of the reinforcement project.

Contents of the invention

The object of the present invention is to provide a material-saving, cost-reducing, and simple construction device for reinforcing bending concrete members in consideration of the above problems.

The object of the present invention is to provide a simple, convenient and practical method for strengthening flexural concrete members in consideration of the above problems.

The technical solution of the present invention is: the device for strengthening the flexural concrete member of the present invention includes a fiber reinforced composite material sheet, a first clamp and a second clamp, a first anchor bolt and a second anchor bolt, a first bolt, a lap Connecting steel block, first steel plate and second steel plate, steel hinge wire, second bolt, jack, U-shaped hoop, wherein the two ends of the tensile surface of the reinforced concrete member are grooved, the first steel plate and the second steel plate with reserved holes The steel plates are pressed against the two ends of the reinforced concrete member respectively, and the two ends of the first steel plate and the second steel plate are respectively stretched with steel hinge lines to form a reaction platform with the reinforced concrete member. The first clamp and the second clamp are respectively Bonding and clamping at both ends of the fiber-reinforced composite material sheet; after the bonding resin is applied on the surface between the two grooves of the reinforced concrete member, the first clamp and the second clamp are embedded in the grooves set at both ends of the reinforced concrete member ; the first anchor bolt anchors the first fixture at one end in the concrete; the first bolt connects the lapped steel block with the second fixture, and the second bolt passes through the first steel plate to connect with the lapped steel block; the jack tensions The second bolt applies prestress to the fiber-reinforced composite sheet; the fiber-reinforced composite sheet is pasted on the surface of the reinforced concrete member, and the second anchor bolt implants the second clamp holding the fiber-reinforced composite sheet Inside the concrete; U-shaped hoops made of fiber-reinforced composite materials are pasted at both ends of the reinforced concrete member.

After the bonding glue of the fiber-reinforced composite sheet is cured, the tension prestress is released, and the overlapping steel blocks, the first steel plate and the second steel plate are removed.

There are 4 above-mentioned steel hinge lines, and the 4 steel hinge lines respectively fix the first steel plate and the second steel plate to the two ends of the reinforced concrete member to form a prestressed tension reaction platform.

The above-mentioned first steel plate has a tension hole reserved at a height corresponding to the second clamp.

The height of the above-mentioned overlapping steel block is the same as that of the second fixture, and the bolt connection holes corresponding to the second fixture are reserved on one side of the lapping steel block, and the screw holes for connecting the tensioning second bolts are reserved on the other side.

The method for strengthening the flexural concrete member of the present invention comprises the following steps:

1) Grooving at both ends of the tensile surface of the reinforced concrete member;

2) Put the first steel plate and the second steel plate with reserved holes on the two ends of the reinforced member respectively, and stretch the steel hinge line so that the first steel plate, the second steel plate and the reinforced concrete member form a reaction platform;

3) Using the first clamp and the second clamp to respectively bond and clamp the two ends of the fiber reinforced composite material sheet;

4) After smearing bonding resin on the surface between the two grooves of the reinforced concrete member, insert the first fixture and the second fixture into the groove;

5) Use the first anchor bolt to anchor the first clamp at one end to the concrete;

6) Use the first bolt to connect the lapped steel block with the second fixture;

7) Use a jack to stretch the second bolt that passes through the first steel plate and the lapped steel block to apply prestress to the fiber reinforced material composite sheet;

8) Paste the fiber-reinforced material composite sheet on the surface of the reinforced concrete member, and use the second anchor bolt to implant the fixture into the concrete;

9) Paste U-shaped hoops made of fiber-reinforced composite materials at both ends of the reinforced concrete member;

10) After the bonding glue is cured, release the prestressing force, and remove the overlapping steel block, the first steel plate and the second steel plate.

In the present invention, slots are made at both ends of the tensile surface of the concrete member, and the steel plates with reserved holes are pushed against the two ends of the member respectively, and the steel hinge wire is stretched so that the steel plate and the concrete member form a reaction platform; then, the bonded and clamped fiber The steel clamps at both ends of the reinforced composite material are embedded in the groove, and anchor bolts are used to anchor the clamp at one end to the concrete, and the clamp at the other end is connected with bolts and lap steel blocks; The connected high-strength bolts are used as tension rods, and the fiber-reinforced composite materials are stretched by jacks; finally, the fiber-reinforced composite materials are pasted and the clamps at the tensioning end are anchored in the concrete, and U-shaped hoops are pasted on both ends of the reinforcement components. After the glue is cured, the tensile prestress is released step by step. Compared with other existing methods, the present invention is an easy-to-implement fiber-reinforced composite material sheet prestressed reinforcement technology, which uses the reinforced concrete member itself as a tensioning reaction platform, avoiding making complicated tensioning devices , and at the same time, it better solves the anchoring problem of prestressed fiber reinforced composite materials, and is suitable for all flexural concrete members reinforced by fiber reinforced composite material sheets. The invention is a convenient and practical device and method for strengthening bending concrete members with ingenious design and excellent performance.

Description of drawings

Fig. 1 is the structure schematic diagram that the present invention utilizes the reinforced member to carry out the prestressed tensioning and anchoring of the fiber reinforced composite material as the reaction platform;

Figure 2 is a partial enlarged view of the anchorage area at the tension end.

Detailed ways

Example:

The structure schematic diagram of the present invention is shown in Fig. 1, 2, and the device for strengthening the concrete member of bending of the present invention includes fiber-reinforced composite material sheet 2, the first clamp 3 and the second clamp 4, the first anchor bolt 5 and The second anchor bolt 51, the first bolt 6, the lap steel block 7, the first steel plate 8 and the second steel plate 9, the steel strand 10, the second bolt 11, the jack 12, the U-shaped hoop 13, wherein the reinforced concrete member The two ends of the tensile surface of 1 are grooved, and the first steel plate 8 and the second steel plate 9 with reserved holes respectively support the two ends of the reinforced concrete member 1, and the two ends of the first steel plate 8 and the second steel plate 9 are stretched respectively There is a steel hinge line 10 to form a reaction platform with the reinforced concrete member 1, and the first clamp 3 and the second clamp 4 are respectively bonded and clamped to the two ends of the fiber reinforced composite material sheet 2; the reinforced concrete member 1 After the adhesive resin is applied on the surface between the two grooves, the first fixture 3 and the second fixture 4 are embedded in the grooves provided at both ends of the reinforced concrete member 1; the first anchor bolt 5 anchors the first fixture 3 at one end to the concrete Middle; the first bolt 6 connects the lap steel block 7 with the second clamp 4, and the second bolt 11 passes through the first steel plate 8 to connect with the lap steel block 7; 12 jacks pull the second bolt 11 to give the fiber The reinforced composite material sheet 2 is prestressed; the fiber reinforced composite material sheet 2 is pasted on the surface of the reinforced concrete member 1, and the second anchor bolt 51 implants the second clamp 4 holding the fiber reinforced material composite sheet 2 In the concrete; the two ends of the reinforced concrete member 1 are pasted with U-shaped hoops 13 made of fiber-reinforced composite materials.

After the bonding glue of the fiber reinforced composite material sheet 2 is cured, the tension prestress is released, and the overlapping steel block 7 and the first steel plate 8 and the second steel plate 9 are removed.

Above-mentioned steel hinge line 10 is provided with 4, and 4 steel hinge lines 10 are respectively fixed on the two ends of reinforced concrete member 1 with the first steel plate 8 and the second steel plate 9.

In this embodiment, the above-mentioned first steel plate 8 has a tension hole reserved at a height corresponding to the second clamp 4 .

The height of the above-mentioned overlapping steel block 7 is the same as the height of the second clamp 4, and the bolt connection hole corresponding to the second clamp 4 is reserved on one side of the overlapping steel block 7, and the other side is reserved for connecting the tensioning second bolt 11 screw holes.

The method for strengthening the flexural concrete member of the present invention is to use the reinforced concrete member 1 itself as a counter force platform, and adopt the slotting and embedding method to anchor the first clamp 3 clamping the fiber reinforced composite material sheet 2 in the concrete member, Through the connection between the overlapping steel block 7 and the second fixture 4, the second bolt 11 of the overlapping steel block 7 is stretched by 12 jacks, and the prestressed fiber reinforced composite material is implemented to reinforce the component, which avoids the development of complicated tensioning devices . The actual implementation includes the following specific steps:

1) Grooving. According to the size of the first clamp 3 and the second clamp 4, grooves are made at both ends of the tension surface of the reinforced concrete member 1. Both the first clamp 3 and the second clamp 4 are composed of two parts reserved for connecting anchor bolt holes, the upper and lower parts The butt joint surface of the fixture is constructed in a wave shape, the upper and lower parts can be joined together to form a whole, and the depth of the slot is just so that the butt joint surfaces of the upper and lower parts of the fixture are on the same level as the tensile surface of the reinforced concrete member 1. In addition, bolt connection holes are reserved on one side of the second fixture 4, as shown in FIG. 2 ;

2) Form a tension reaction platform. Put the first steel plate 8 and the second steel plate 9 on the two ends of the reinforced member 1 respectively, penetrate 4 steel hinge lines in the reserved holes to connect the first steel plate 8 and the second steel plate 9, and stretch the steel hinge lines 10 Make the first steel plate 8 and the second steel plate 9 and the reinforced concrete member 1 form a counter force platform, wherein the first steel plate 8 reserves an external tension hole at the height corresponding to the second clamp 4, as shown in Figure 1;

3) Bonding and clamping the two ends of the fiber reinforced composite material. Cut or weave the fiber reinforced composite material sheet 2 according to the size of the concrete member to be reinforced, and then apply bonding resin on the upper and lower parts of the first clamp 3 and the second clamp 4, and use the first clamp 3 and the second clamp 4 to glue them respectively. The knot clamps both ends of the fiber reinforced composite material sheet 2;

4) Insert the fixture. After applying adhesive resin on the surface between the two grooves of the reinforced member 1, insert the first fixture 3 and the second fixture 4 into the groove, and use the first anchor bolt 5 to anchor the first fixture 3 in the concrete;

5) Connect lap steel blocks. Use the first bolt 6 to connect the lap steel block 7 with the second clamp 4), wherein the height of the lap steel block 7 is the same as the height of the second clamp 4, and one side of the lap steel block 7 is reserved for the second clamp 4 corresponding bolt connection holes, and the screw holes for connecting the second bolt 11 are reserved on the other side;

6) Tensile fiber reinforced composites. Using high-strength second bolts 11 of 12-16 mm to pass through the first steel plate 8 to connect with the overlapping steel block 7, and using a jack 12 to directly stretch the second bolts 11, so that the fiber reinforced composite material sheet 2 obtains prestress;

7) Paste fiber-reinforced composite materials. Use the second anchor bolt 51 to implant the second clamp 4 into the concrete, then impregnate and paste the fiber reinforced composite material sheet 2 on the surface of the reinforced concrete member 1 with resin, and place the two ends of the reinforced concrete member 1 near the region of the clamp Resin is applied to the sides, and 2 to 3 U-shaped hoops 13 made of fiber-reinforced composite materials are pasted every 80mm on each end;

8) Release the prestress. After the bonding glue is cured, the prestress is released step by step, and the overlapping steel block 7, the first steel plate 8 and the second steel plate 9 are removed.

Claims (6)

1. a reinforcing is subjected to the device of curved concrete component, it is characterized in that including fibre reinforced composites sheet material (2), the first anchor clamps (3) and the second anchor clamps (4), the first crab-bolt (5) and the second crab-bolt (51), the first bolt (6), overlap joint bloom (7), the first steel plate (8) and the second steel plate (9), steel hinge line (10), the second bolt (11), jack (12), U-shaped hoop (13), wherein be reinforced the tension face two ends fluting of concrete component (1), the first steel plate (8) and the second steel plate (9) with preformed hole withstand on respectively the two ends that are reinforced concrete component (1), the two ends of the first steel plate (8) and the second steel plate (9) respectively stretch-draw have and make it and be reinforced the steel hinge line (10) that concrete component (1) forms the counter-force platform, and the first anchor clamps (3) and the second anchor clamps (4) bond respectively and are clamped in the two ends of fibre reinforced composites sheet material (2); Be reinforced after binding resin is smeared on the surface between two grooves of concrete component (1), the first anchor clamps (3) and the second anchor clamps (4) embed and are reinforced in the set groove in concrete component (1) two ends; The first crab-bolt (5) is anchored in first anchor clamps (3) of an end in the concrete; The first bolt (6) will overlap bloom (7) and link together with the second anchor clamps (4), and the second bolt (11) passes the first steel plate (8) and is connected with overlap joint bloom (7); Jack (12) stretch-draw the second bolt (11) applies prestressing force for fibre reinforced composites sheet material (2); Fibre reinforced composites sheet material (2) is pasted on the surface that is reinforced concrete component (1), and the second crab-bolt (51) is implanted second anchor clamps (4) of gripping fibers reinforcing material composite sheet (2) in the concrete; The U-shaped hoop (13) of being made by fibre reinforced composites is pasted at the both ends that are reinforced concrete component (1).

2. reinforcing according to claim 1 is subjected to the device of curved concrete component, it is characterized in that above-mentionedly putting tension prestress after fibre reinforced composites sheet material (2) adhesive glue is solidified, and removes overlap joint bloom (7) and the first steel plate (8) and the second steel plate (9).

3. reinforcing according to claim 1 is subjected to the device of curved concrete component, it is characterized in that above-mentioned steel hinge line (10) is provided with 4,4 steel hinge lines (10) are individually fixed in the two ends that are reinforced concrete component (1) with the first steel plate (8) and the second steel plate (9), form prestressed stretch-draw counter-force platform.

4. reinforcing according to claim 1 is subjected to the device of curved concrete component, it is characterized in that above-mentioned the first steel plate (8) is reserved with the stretch-draw hole at the At The Height of corresponding the second anchor clamps (4).

5. reinforcing according to claim 1 is subjected to the device of curved concrete component, the height that it is characterized in that above-mentioned overlap joint bloom (7) is identical with the height of the second anchor clamps (4), overlap joint bloom (7) one sides are reserved the bolt connecting hole corresponding with the second anchor clamps (4), and opposite side remains for connecting the screw of stretch-draw the second bolt (11) in advance.

6. a reinforcing is subjected to the method for curved concrete component, it is characterized in that may further comprise the steps:

1) is being reinforced the tension face two ends fluting of concrete component (1);

2) will withstand on respectively with first steel plate (8) of preformed hole and the second steel plate (9) and be reinforced the member two ends, stretch-draw steel hinge line (10) makes the first steel plate (8) and the second steel plate (9) and is reinforced concrete component (1) and forms the counter-force platform;

3) utilize bond the respectively two ends of gripping fibers reinforced composite sheet material (2) of the first anchor clamps (3) and the second anchor clamps (4);

4) after binding resin is smeared on the surface between two grooves that are reinforced concrete component (1), in the first anchor clamps (3) and the second anchor clamps (4) embedded groove;

5) adopt the first crab-bolt (5) that first anchor clamps (3) of an end are anchored in the concrete;

6) utilizing the first bolt (6) will overlap bloom (7) couples together with the second anchor clamps (4);

7) utilize jack (12) stretch-draw to pass the second bolt (11) that the first steel plate (8) is connected with overlap joint bloom (7), apply prestressing force for fiber reinforced material composite sheet (2);

8) fiber reinforced material composite sheet (2) is pasted on the surface that is reinforced concrete component (1), and utilizes the second crab-bolt (51) that anchor clamps (4) are implanted in the concrete;

9) be reinforced the U-shaped hoop (13) of concrete component (1) both ends stickup by the fibre reinforced composites making;

10) put tension prestress after the adhesive curing to be bonded, remove overlap joint bloom (7) and the first steel plate (8) and the second steel plate (9).

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