CFRP cloth hoop concrete beam with clamping grooves

Abstract

The utility model discloses a CFRP cloth hoop concrete beam with clamping grooves. The CFRP cloth hoop concrete beam comprises CFRP longitudinal bars, CFRP cloth strips and the top transverse clamping grooves. The CFRP cloth strips replace traditional steel bar hoops, the top transverse buckles are pre-buried in a formwork, top CFRP longitudinal bars and the CFRP cloth strips can be well anchored, the CFRP cloth strips can be tightly combined with concrete, the CFRP cloth strips are arranged in a U shape in the beam length direction, the ends of the CFRP cloth strips are arranged in an X shape so as to resist large shearing force at the position of a support, crack development can be more effectively restrained through oblique arrangement, and the construction efficiency is improved. The shear resistance of the concrete beam is enhanced, and the weight reduction effect is achieved. Different from a common reinforced concrete structure, the durability of the structure is improved due to shear resistance of the CFRP cloth strips and fixation of the clamping grooves, the structure has the advantages of being light in weight and high in strength, meanwhile, construction processes such as steel bar binding are omitted, and the construction cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the inside steel reinforcement framework structure of concrete beam belongs to the building engineering technical field, concretely is with the CFRP cloth strip is replaced ordinary reinforcement as stirrup shear and has the fixed of draw -in groove. BACKGROUND

[0002] At present, in the traditional reinforced concrete beam, the stirrup is easy to rust in the humid, salt fog or chemical corrosion environment, which leads to the cracking and peeling of the concrete protective layer, and seriously reduces the structural durability. Although the use of FRP bars as stirrups improves the durability of the structure, it needs to be customized with a curved shape, and stress concentration is easy to occur at the bending part, resulting in brittle fracture. The stirrup needs to be tied on site, and the process is complicated. The tying needs to use a tying wire, which is easy to corrode after long-term use. The ordinary steel reinforcement needs to be repaired frequently after corrosion, and the maintenance cost is high in the later period, which is not conducive to the sustainable development of the structure.

[0003] The CFRP cloth strip is often used as an external strengthening material to enhance the shear resistance. There is no direct replacement of the steel stirrup with CFRP cloth as a stirrup to resist shear. The traditional process relies too much on adhesive paste. The adhesive is easy to be affected by ultraviolet light and heat aging, and is easy to peel off after a long time. In the prior art, metal components are used to replace the adhesive by mechanical anchoring. However, the local extrusion of the anchoring point can damage the CFRP cloth strip, reduce the tensile strength, and the metal anchor is not corrosion resistant, which is not suitable for use in harsh environments. SUMMARY

[0004] The utility model discloses a CFRP cloth hoop concrete beam with draw -in groove, the internal material is light and high -strength, effectively alleviates the stress concentration phenomenon of FRP stirrup bending part, is applicable to the severe environment such as marine engineering, chemical plant.

[0005] The utility model discloses a CFRP (carbon fiber Carbon Fiber Reinforced Plastics) cloth hoop concrete beam with draw -in groove, including CFRP longitudinal reinforcement, CFRP cloth strip, top horizontal draw -in groove;

[0006] The CFRP longitudinal reinforcement penetrates the concrete beam, so that the structure can be used in corrosive environment. The CFRP longitudinal reinforcement includes top CFRP longitudinal reinforcement and bottom CFRP longitudinal reinforcement. The top CFRP longitudinal reinforcement is arranged in one layer, and the bottom CFRP longitudinal reinforcement is arranged in two layers.

[0007] The CFRP cloth strip is arranged in a U shape along the concrete beam to form a U-shaped CFRP cloth strip. The top of the U-shaped CFRP cloth strip is reserved for 15-20mm for anchoring and overlapping, reducing the stress concentration phenomenon at the bending part.

[0008] The CFRP cloth strips are arranged in X-shaped oblique cross at the support, forming end X-shaped binding CFRP cloth strips, reinforcing the end shear capacity, forming a mesh shear system, which is suitable for severe working environment while being light and high-strength.

[0009] The top transverse clamping groove is anchored in the upper formwork of the concrete beam by bolts, and bolt holes are arranged on both sides of the top transverse clamping groove.

[0010] Preferably, the surface of the CFRP cloth strip is uniformly coated with epoxy resin impregnated glue to ensure its bonding performance.

[0011] Preferably, the top transverse clamping groove is provided with symmetrical buckles having a self-locking effect when closed to prevent the CFRP cloth strip from slipping.

[0012] Preferably, the top transverse clamping groove is made of glass fiber reinforced plastic, which is light and corrosion resistant.

[0013] The CFRP cloth has the characteristics of light rust, low cost and long service life, and fills the technical blank of replacing stirrups with CFRP cloth.

[0014] Step one, cutting and winding CFRP cloth strips, and erecting CFRP longitudinal reinforcement.

[0015] Step two, brush epoxy resin impregnated glue on the surface of the CFRP cloth strip, and wind the end shear reinforcement, repeatedly apply at the corner, and stand for 24 hours until it hardens and fixes.

[0016] Step three, support the formwork and apply release agent, and reserve the hole of the top transverse clamping groove in the formwork for bolt fixation.

[0017] Step four, place the wound and fixed CFRP reinforcement framework in the formwork, anchor the top transverse clamping groove in the upper formwork of the concrete beam by bolts, clamp the CFRP cloth strip with the buckle, and clamp the top CFRP longitudinal reinforcement with the groove.

[0018] Step five, pour concrete, stir with a vibrating rod while pouring, and make a cube test block during pouring for measuring the physical and mechanical properties of the concrete.

[0019] Step six, remove the formwork one day after pouring the test piece, take out the bolts from the pre-buried bolt holes, and use winter indoor curing conditions for 28 days of curing time.

[0020] The utility model has the advantages of:

[0021] 1. The CFRP cloth strip is used to replace the steel bar as the stirrup shear, and the longitudinal reinforcement is also the composite material, which greatly reduces the weight of the structure, and facilitates the transportation and assembly of the structure.

[0022] 2. The pre-installed clamping groove is self-locked by clamping and engaging with the concrete, and does not excessively rely on the bonding effect of the adhesive, so that binding wire is not needed, and the durability of the structure is improved.

[0023] 3. Compared with the ordinary reinforced concrete structure, the use of the composite material greatly improves the durability of the structure, and the corrosion resistance is strong, and is suitable for marine engineering, chemical plant and the like in harsh environment. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the internal structure schematic view of the CFRP cloth hoop concrete beam with a clamping groove.

[0025] Figure 2 is an enlarged view of the top transverse clamping groove.

[0026] Figure 3 is the external overall schematic view after pouring of the utility model.

[0027] Mark: 1, U-shaped CFRP cloth strip; 2, CFRP longitudinal reinforcement; 3, end X-shaped binding CFRP cloth strip; 4, top transverse clamping groove; 5, bolt hole; 6, groove; 7, buckle; 8, rotatable round groove; 9, concrete. DETAILED DESCRIPTION

[0028] The entire technical scheme will be described in detail in combination with the drawings and specific embodiments of the utility model.

[0029] Referring to Figures 1-3 , a CFRP cloth hoop concrete beam with a clamping groove, comprising CFRP longitudinal reinforcement 2, CFRP cloth strip, top transverse clamping groove 4;

[0030] The CFRP longitudinal reinforcement 2 is longitudinally arranged in the concrete beam, so that the structure can be used in a corrosive environment, and the CFRP longitudinal reinforcement 2 is divided into top CFRP longitudinal reinforcement and bottom CFRP longitudinal reinforcement, the top CFRP longitudinal reinforcement is arranged in one layer, and the bottom CFRP longitudinal reinforcement is arranged in two layers.

[0031] The CFRP cloth strip is arranged along the concrete beam in the form of U-shaped CFRP cloth strip 1, and the top of the U-shaped CFRP cloth strip 1 is reserved for 15-20mm for anchoring and lapping, so as to reduce the stress concentration phenomenon at the bending part.

[0032] The CFRP cloth strips are arranged in X-shaped oblique cross at the support to form end X-shaped binding CFRP cloth strips 3, strengthen the end shear capacity, form a mesh shear system, and are suitable for harsh working environments while being light and high-strength.

[0033] The top transverse clamping groove 4 is pre-buried and fixed, is anchored to the upper formwork of the concrete beam by bolts, is provided with bolt holes 5 on both sides, contains a groove 6 for fixing the top CFRP longitudinal reinforcement, and clamps a buckle 7 for CFRP cloth strips. The buckle 7 can be freely opened and closed and is located in a rotatable circular groove 8.

[0034] The CFRP cloth strips are uniformly coated with epoxy resin impregnated glue on the surface to ensure the bonding performance. The top transverse clamping groove 4 is provided with symmetrical buckles that have a self-locking effect when closed to prevent the CFRP cloth strips from slipping. The top transverse clamping groove 4 is made of glass fiber reinforced plastic and is light and corrosion-resistant.

[0035] The method for manufacturing the CFRP cloth hoop concrete beam with a clamping groove comprises the following steps.

[0036] Step one, cut and wind the U-shaped CFRP cloth strip 1 and the end X-shaped binding CFRP cloth strip 3, and erect the CFRP longitudinal reinforcement 2.

[0037] Step two, brush epoxy resin impregnated glue on the surface of the U-shaped CFRP cloth strip 1 and the end X-shaped binding CFRP cloth strip 3, and wind the end shear strength, repeatedly coat at the corner, and stand for 24 hours until it is hardened and fixed. The CFRP reinforcement framework with the CFRP cloth hoop is preliminarily formed.

[0038] Step three, support the formwork and apply release agent. The holes of the top transverse clamping groove 4 are reserved in the formwork in the corresponding positions to be fixed by bolts.

[0039] Step four, place the wound and fixed CFRP reinforcement framework (see Figure 1 ) in the formwork. The top transverse clamping groove 4 is anchored to the upper formwork of the concrete beam by bolts. The buckle 7 clamps the U-shaped CFRP cloth strip 1 and is placed in the rotatable circular groove 8. The buckle 7 forms a self-locking structure (see Figure 2 ) after being buckled in the top end and the groove. The groove 6 clamps the top CFRP longitudinal reinforcement.

[0040] Step five, pour the concrete 9, stir it with a vibrating rod while pouring, and make a cube test block during the pouring process to measure the physical and mechanical properties of the concrete.

[0041] Step six, remove the formwork one day after the pouring of the test piece is completed. Remove the bolts from the pre-buried bolt holes 5 and adopt the indoor curing conditions in winter. The curing time is 28 days.

[0042] The embodiment of the utility model is described in detail above in combination with the drawings, and it should be noted that, for ordinary skilled persons in the technical field, some modifications, equivalent replacements, improvements and the like can be made without departing from the principle of the utility model, and these modifications, equivalent replacements, improvements and the like should be regarded as the protection scope of the utility model.

Claims

1. A CFRP (Cemented Plastic Reinforced Polymer) reinforced concrete beam with a slotted design, characterized in that: Includes CFRP longitudinal reinforcement, CFRP strips, and top transverse grooves; The CFRP longitudinal reinforcement runs through the concrete beam. The CFRP longitudinal reinforcement is divided into top CFRP longitudinal reinforcement and bottom CFRP longitudinal reinforcement. The top CFRP longitudinal reinforcement is arranged in one layer, and the bottom CFRP longitudinal reinforcement is arranged in two layers. The CFRP strips are arranged in a U-shape along the concrete beam to form U-shaped CFRP strips, with a 15-20mm gap reserved at the top of the U-shaped CFRP strips for anchoring overlap. The CFRP strips are arranged in an X-shaped diagonal cross at the support to form an X-shaped binding CFRP strip at the end; The top transverse slot is anchored to the upper formwork of the concrete beam by bolts. Bolt holes are provided on both sides of the top transverse slot. It contains grooves for fixing the top CFRP longitudinal reinforcement and buckles for clamping the CFRP strips. The freely opening and closing buckles are located in the rotatable circular groove.

2. The CFRP reinforced concrete beam with a slot as described in claim 1, characterized in that: The surface of the CFRP strip is uniformly coated with epoxy resin impregnation material.

3. A CFRP reinforced concrete beam with a slot as described in claim 1, characterized in that: The top horizontal slot is equipped with symmetrical buckles that have a self-locking effect when closed.

4. A CFRP reinforced concrete beam with a slot as described in claim 1, characterized in that: The top lateral slot is made of glass fiber reinforced plastic.

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