Anchoring device and method for drilling-free FRP reinforced structure

Abstract

The present invention discloses an anchoring device and method for a drilling-free FRP reinforcement structure, which relates to the technical field of concrete structure reinforcement, including a reinforcement structure and an anchoring device, wherein the reinforcement structure includes a concrete beam and an FRP sheet, an adhesive is provided between the concrete beam and the FRP sheet, the fixing device is provided outside the concrete beam and the FRP sheet, and the anchoring device includes a U-shaped anchoring steel plate, and the U-shaped anchoring steel plate is located outside the FRP sheet. The present invention uses high-strength bolts to connect the bottom U-shaped steel plate and the stepped reaction frame and the U-shaped anchoring steel plate, and by tightening the high-strength bolts, the U-shaped anchoring steel plate moves downward to anchor the FRP sheet, thereby avoiding drilling connection. The anchoring device is connected by high-strength bolts, so it is easy to disassemble and assemble, and has higher installation flexibility. Since drilling is not required, the original strength of the concrete beam will not be damaged, and the installation efficiency is also greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete structure reinforcement, and in particular to an anchoring device and method for a drilling-free FRP reinforcement structure. Background Art

[0002] Fiber reinforced polymer (FRP) is widely used in structural reinforcement due to its significant advantages such as light weight, high strength, corrosion resistance, and convenient processing. At present, the most widely used and most deeply studied technology in the world is the external FRP reinforcement technology, also known as EB-FRP reinforcement technology. The EB-FRP reinforcement technology is to use epoxy resin to directly adhere the FRP sheet to the structure to be reinforced, so that the load on the structure is transferred to the FRP material through the adhesive such as epoxy resin, so that the FRP shares the load that is difficult to bear for the original structure, and the reinforcement effect is achieved by this method. It is not difficult to see that the bonding strength between FRP and concrete will play a decisive role in the reinforcement effect of FRP reinforced concrete structure. However, a large number of experimental studies have shown that the FRP-concrete bonding interface is relatively fragile, and it is very consistent that it is a peeling failure with FRP peeling off from concrete as the typical failure form. Therefore, domestic and foreign scholars have proposed the HB-FRP bonding and anchoring system, which refers to installing some mechanical fasteners along the FRP sheet at different intervals on the reinforced component on the basis of the EB-FRP bonding system. This can effectively prevent the early peeling of the FRP sheet. The form of damage is generally the breaking of the FRP sheet. However, the HB-FRP bonding and anchoring system usually requires drilling holes in the structure to be reinforced before the bolts can be driven in, which causes certain damage to the concrete structure and affects its bearing capacity to a certain extent. Summary of the invention

[0003] The object of the present invention is to provide a drilling-free FRP reinforced structure anchoring device and method to solve the above-mentioned deficiencies in the prior art.

[0004] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: an anchoring device of a drilling-free FRP reinforced structure, comprising a reinforcement structure and an anchoring device, wherein the reinforcement structure comprises a concrete beam and an FRP sheet, an adhesive is arranged between the concrete beam and the FRP sheet, the anchoring device is arranged outside the concrete beam and the FRP sheet, the anchoring device comprises a U-shaped anchoring steel plate, the U-shaped anchoring steel plate is located outside the FRP sheet, both sides of the U-shaped anchoring steel plate are provided with a stepped reaction frame, the bottom of the two stepped reaction frames is provided with a bottom U-shaped steel plate, and both ends of the top of the U-shaped anchoring steel plate are A flange is fixedly connected, and flanges are fixedly connected to the inner sides of the top ends of the two stepped reaction frames, the outer sides of the bottom ends of the two stepped reaction frames, and the outer sides of the tops of both sides of the bottom U-shaped steel plate, and the flanges at the top ends of the stepped reaction frames are located at the bottom of the flanges outside the U-shaped anchor steel plate, and bolt holes are provided inside the outer flanges of the U-shaped anchor steel plate, the flanges at both ends of the stepped reaction frames, and the flanges on the top of the bottom U-shaped steel plate, and high-strength bolts are installed through the bolt holes between the outer flanges of the U-shaped anchor steel plate and the flanges at the top ends of the stepped reaction frames, and between the flanges at the bottom ends of the stepped reaction frames and the flanges on the top of the bottom U-shaped steel plate.

[0005] Preferably, a plurality of anchoring devices are evenly arranged on each group of the reinforcement structures.

[0006] Preferably, a method for anchoring a drilling-free FRP reinforced structure comprises the following steps:

[0007] Step 1: Apply the adhesive to the reinforcement area of ​​the concrete beam to be reinforced, and bond the FRP sheet to the adhesive;

[0008] Step 2: clamp the bottom U-shaped steel plate and the stepped reaction frame in the corresponding positions of the concrete beam, and connect and fasten the flanges between the bottom U-shaped steel plate and the stepped reaction frame by high-strength bolts;

[0009] Step 3: Place the U-shaped anchor steel plate on the FRP sheet, and connect the flanges on both sides of the U-shaped anchor steel plate to the flanges on the top of the two stepped reaction frames through high-strength bolts.

[0010] Preferably, the U-shaped anchoring steel plate is moved downward by tightening the high-strength bolts on both sides of the U-shaped anchoring steel plate to anchor the FRP sheet, thereby generating an anchoring force, and the tighter the high-strength bolts are tightened, the greater the anchoring force generated.

[0011] Preferably, the width of the bottom of the U-shaped anchoring steel plate is greater than the width of the FRP sheet.

[0012] Preferably, the bottom U-shaped steel plate is made of low-carbon steel.

[0013] Preferably, the adhesive is epoxy resin.

[0014] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0015] The present invention applies an adhesive to the reinforcement area of ​​the concrete beam to be reinforced, and bonds the FRP sheet to the adhesive, so that the FRP sheet is connected to the concrete beam as a reinforcement material, and a bottom U-shaped steel plate and a stepped reaction frame are arranged to be clamped in the corresponding position of the concrete beam, and the flanges between the bottom U-shaped steel plate and the stepped reaction frame are connected and fastened by high-strength bolts, and then the U-shaped anchoring steel plate is placed on the FRP sheet, and the flanges on both sides of the U-shaped anchoring steel plate are connected to the flanges on the tops of the two stepped reaction frames by high-strength bolts. By tightening the high-strength bolts on both sides of the U-shaped anchor steel plate, the U-shaped anchor steel plate is moved downward to anchor the FRP sheet, thereby generating an anchoring force. The tighter the high-strength bolts are tightened, the greater the anchoring force generated. Furthermore, by setting up multiple sets of Mo A-share devices, the FRP sheet can be tightly connected to the concrete beam with an adhesive, thereby avoiding drilling connection. The anchor device is connected by high-strength bolts, so it is easy to disassemble and assemble, and the installation flexibility is higher. Since drilling is not required, the original strength of the concrete beam will not be damaged, and the installation efficiency is also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the structure of the anchoring state of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of the anchoring device of the present invention.

[0019] Figure 3 It is a top view of the anchoring state of the present invention.

[0020] Figure 4 It is a side view of the anchoring state of the present invention.

[0021] Figure 5 It is a schematic diagram of the high-strength bolt structure of the present invention.

[0022] Description of reference numerals:

[0023] 1. High-strength bolts; 2. U-shaped anchor steel plate; 3. Bolt holes; 4. Stepped reaction frame; 5. Bottom U-shaped steel plate; 6. Concrete beam; 7. FRP sheet. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] The present invention provides Figure 1-5 The anchoring device of the FRP reinforced structure without drilling shown in the figure comprises a reinforcement structure and an anchoring device, wherein the reinforcement structure comprises a concrete beam 6 and an FRP sheet 7, an adhesive is arranged between the concrete beam 6 and the FRP sheet 7, the fixing device is arranged outside the concrete beam 6 and the FRP sheet 7, the anchoring device comprises a U-shaped anchoring steel plate 2, the U-shaped anchoring steel plate 2 is located outside the FRP sheet 7, both sides of the U-shaped anchoring steel plate 2 are provided with a stepped reaction frame 4, the bottom of the two stepped reaction frames 4 is provided with a bottom U-shaped steel plate 5, the two ends of the top of the U-shaped anchoring steel plate 2 are fixedly connected with flanges, and the two The inner side of the top of the stepped reaction frame 4, the outer side of the bottom ends of the two stepped reaction frames 4 and the outer side of the top of both sides of the bottom U-shaped steel plate 5 are all fixedly connected with flanges, and the flange at the top of the stepped reaction frame 4 is located at the bottom of the flange outside the U-shaped anchor steel plate 2, and the inner sides of the outer flange of the U-shaped anchor steel plate 2, the flanges at both ends of the stepped reaction frame 4 and the flange on the top of the bottom U-shaped steel plate 5 are all provided with bolt holes 3, and high-strength bolts 1 are installed between the outer flange of the U-shaped anchor steel plate 2 and the flange at the top of the stepped reaction frame 4, and between the flange at the bottom end of the stepped reaction frame 4 and the flange on the top of the bottom U-shaped steel plate 5 through the bolt holes 3.

[0026] Furthermore, in the above technical solution, a plurality of anchoring devices are evenly arranged on each group of the reinforcement structures;

[0027] A method for anchoring an FRP reinforced structure without drilling, comprising the following steps:

[0028] Step 1: Apply the adhesive to the reinforcement area of ​​the concrete beam 6 to be reinforced, and bond the FRP sheet 7 to the adhesive;

[0029] Step 2: clamp the bottom U-shaped steel plate 5 and the stepped reaction frame 4 in the corresponding positions of the concrete beam 6, and connect and fasten the flanges between the bottom U-shaped steel plate 5 and the stepped reaction frame 4 with high-strength bolts 1;

[0030] Step 3: Place the U-shaped anchoring steel plate 2 on the FRP sheet 7, and connect the flanges on both sides of the U-shaped anchoring steel plate 2 to the flanges on the tops of the two stepped reaction frames 4 through high-strength bolts 1;

[0031] Furthermore, in the above technical solution, the U-shaped anchoring steel plate 2 is moved downward by tightening the high-strength bolts 1 on both sides of the U-shaped anchoring steel plate 2 to anchor the FRP sheet 7, thereby generating an anchoring force, and the tighter the high-strength bolts 1 are tightened, the greater the anchoring force generated;

[0032] Further, in the above technical solution, the width of the bottom of the U-shaped anchoring steel plate 2 is greater than the width of the FRP sheet 7;

[0033] Further, in the above technical solution, the bottom U-shaped steel plate 5 is made of low carbon steel;

[0034] Furthermore, in the above technical solution, the adhesive is epoxy resin;

[0035] The specific implementation method is as follows: by applying an adhesive to the reinforcement area of ​​the concrete beam 6 to be reinforced, and bonding the FRP sheet 7 to the adhesive, the FRP sheet 7 is connected to the concrete beam 6 as a reinforcement material, and by setting the bottom U-shaped steel plate 5 and the stepped reaction frame 4 to be clamped in the corresponding position of the concrete beam 6, and the flange between the bottom U-shaped steel plate 5 and the stepped reaction frame 4 is connected and fastened by the high-strength bolt 1, and then the U-shaped anchor steel plate 2 is placed on the FRP sheet 7, and the flanges on both sides of the U-shaped anchor steel plate 2 are fastened to the flanges on the top of the two stepped reaction frames 4 by the high-strength bolts 1. The connection is made by tightening the high-strength bolts 1 on both sides of the U-shaped anchoring steel plate 2 to move the U-shaped anchoring steel plate 2 downward, anchoring the FRP sheet 7, thereby generating an anchoring force, and the tighter the high-strength bolts 1 are screwed, the greater the anchoring force generated, and then by setting up multiple groups of Mo A-share devices, the FRP sheet 7 can be connected to the concrete beam 6 by fastening with an adhesive, thereby avoiding drilling connection, and the present anchoring device is connected by the high-strength bolts 1, so it is convenient to disassemble and assemble, and the installation flexibility is higher, and since drilling is not required, the original strength of the concrete beam 6 will not be damaged, and the installation efficiency is also greatly improved.

[0036] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An anchoring device for a drilling-free FRP reinforced structure, comprising a reinforced structure and an anchoring device, characterized in that: The reinforcement structure comprises a concrete beam (6) and an FRP sheet (7), an adhesive is provided between the concrete beam (6) and the FRP sheet (7), the fixing device is arranged outside the concrete beam (6) and the FRP sheet (7), the anchoring device comprises a U-shaped anchoring steel plate (2), the U-shaped anchoring steel plate (2) is located outside the FRP sheet (7), both sides of the U-shaped anchoring steel plate (2) are provided with a stepped reaction frame (4), the bottom of the two stepped reaction frames (4) is provided with a bottom U-shaped steel plate (5), the two ends of the top of the U-shaped anchoring steel plate (2) are fixedly connected with flanges, the inner sides of the top ends of the two stepped reaction frames (4), the outer sides of the bottom ends of the two stepped reaction frames (4) and the bottom U-shaped steel plate (5) are fixedly connected with flanges, Flanges are fixedly connected to the outer sides of the tops of both sides, and the flange at the top of the stepped reaction frame (4) is located at the bottom of the flange outside the U-shaped anchor steel plate (2). Bolt holes (3) are provided inside the outer flange of the U-shaped anchor steel plate (2), the flanges at both ends of the stepped reaction frame (4), and the flange at the top of the bottom U-shaped steel plate (5). High-strength bolts (1) are installed between the outer flange of the U-shaped anchor steel plate (2) and the flange at the top of the stepped reaction frame (4), and between the flange at the bottom of the stepped reaction frame (4) and the flange at the top of the bottom U-shaped steel plate (5) through the bolt holes (3); the width of the bottom of the U-shaped anchor steel plate (2) is greater than the width of the FRP sheet (7); and a plurality of anchoring devices are evenly arranged on each group of the reinforcement structure.

2. The method for anchoring a drilling-free FRP reinforced structure according to claim 1, characterized in that: The following steps are involved: Step 1: Apply the adhesive to the reinforcement area of ​​the concrete beam (6) to be reinforced, and bond the FRP sheet (7) to the adhesive; Step 2: clamp the bottom U-shaped steel plate (5) and the stepped reaction frame (4) in corresponding positions of the concrete beam (6), and connect and fasten the flanges between the bottom U-shaped steel plate (5) and the stepped reaction frame (4) with high-strength bolts (1); Step 3: Place the U-shaped anchoring steel plate (2) on the FRP sheet (7), and connect the flanges on both sides of the U-shaped anchoring steel plate (2) to the flanges on the tops of the two stepped reaction frames (4) through high-strength bolts (1).

3. The method for anchoring a drilling-free FRP reinforced structure according to claim 2, characterized in that: By tightening the high-strength bolts (1) on both sides of the U-shaped anchoring steel plate (2), the U-shaped anchoring steel plate (2) is moved downward to anchor the FRP sheet (7), thereby generating an anchoring force, and the tighter the high-strength bolts (1) are tightened, the greater the anchoring force generated.

4. The method for anchoring a FRP reinforced structure without drilling according to claim 2, characterized in that: The bottom U-shaped steel plate (5) is made of low-carbon steel.

5. The method for anchoring a FRP reinforced structure without drilling according to claim 2, characterized in that: The adhesive is epoxy resin.

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