A fatigue crack reinforcement device for steel box girders

Abstract

This utility model discloses a fatigue crack reinforcement device for steel box girders, relating to the field of bridge repair and reinforcement technology. It includes a reinforcement fabric and a fixing mechanism. The reinforcement fabric is disposed at the fatigue crack in the steel box girder. The fixing mechanism is respectively disposed on both sides of the reinforcement fabric and abuts against it. The fixing mechanism includes a first magnetic block and a second magnetic block, the sides of which are interconnected, and the bottoms of both blocks abut against the reinforcement fabric. The first and second magnetic blocks can be magnetically connected to the steel box girder. Using this utility model, fatigue cracks can be quickly reinforced; the operation is simple, construction efficiency is improved, and long-term stable use is possible.

Description

Technical Field

[0001] This utility model relates to the field of bridge maintenance and reinforcement technology, and in particular to a fatigue crack reinforcement device for steel box girders. Background Technology

[0002] Orthotropic steel box girder structures are widely used in various long-span bridges due to their excellent mechanical properties. However, with the increase in service life and traffic volume, steel box girders are prone to fatigue cracking, which has become one of the stubborn problems restricting their development. If fatigue cracking is not addressed in time, the fatigue cracks will further propagate under heavy traffic, seriously endangering traffic safety. Traditional fatigue crack reinforcement techniques for steel box girders mainly include bridge deck reinforcement, crack arrestor hole method, bolted steel plate method, and crack welding method. These methods are relatively complex for reinforcing steel box girders and involve many construction steps. Bolts are usually required at multiple locations in the reinforcement structure, which not only increases the complexity of the operation and prolongs the construction period, but also makes bolts and other components susceptible to corrosion and rust, leading to instability of the reinforcement structure and the risk of secondary damage. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a fatigue crack reinforcement device for steel box girders, which can quickly reinforce fatigue cracks, is simple to operate, can improve construction efficiency, and can be used stably for a long time.

[0004] To solve the above-mentioned technical problems, this utility model provides a fatigue crack reinforcement device for steel box girders, including a reinforcement fabric and a fixing mechanism. The reinforcement fabric is disposed at the fatigue crack of the steel box girder, and the fixing mechanism is disposed on both sides of the reinforcement fabric and abuts against the reinforcement fabric.

[0005] The fixing mechanism includes a first magnetic block and a second magnetic block. The sides of the first magnetic block and the second magnetic block are connected to each other, and the bottoms of the first magnetic block and the second magnetic block abut against the reinforcing fabric. The first magnetic block and the second magnetic block can be magnetically connected to the steel box girder.

[0006] As an improvement to the above solution, both the first magnetic block and the second magnetic block are provided with an adjuster. The adjuster can adjust the magnitude of the magnetic attraction force of the first magnetic block and the second magnetic block. The adjuster includes a knob that protrudes from the surface of the first magnetic block and the second magnetic block.

[0007] As an improvement to the above solution, a connecting plate is provided between the first magnetic block and the second magnetic block. One end of the connecting plate is connected to the first magnetic block, and the other end of the connecting plate is connected to the second magnetic block. The connecting plate is a flexible plate.

[0008] As an improvement to the above solution, the fixing mechanism further includes a rib plate, which is triangular in shape and is respectively connected between the first magnetic block and the connecting plate and between the second magnetic block and the connecting plate.

[0009] As an improvement to the above solution, the fixing mechanism further includes a pre-pressure plate, which abuts against the reinforcing fabric, and a connecting plate spans across the pre-pressure plate. The bottom of the connecting plate abuts against the pre-pressure plate and can press the pre-pressure plate tightly.

[0010] As an improvement to the above solution, the connecting plate is provided with an adjusting bolt, which can pass through the connecting plate and connect to the pre-pressure plate. The adjusting bolt can adjust the degree of compression of the connecting plate on the pre-pressure plate.

[0011] As an improvement to the above solution, the fatigue crack reinforcement device for the steel box girder further includes a reinforcing steel cable, which is connected between the fixing mechanisms on both sides of the reinforcing fabric and spans across the preload plate and abuts against the preload plate.

[0012] As an improvement to the above solution, the length direction of the reinforcing steel cable is perpendicular to the length direction of the connecting plate. One end of the reinforcing steel cable is connected to the side of the connecting plate on one side of the reinforcing fabric. A through hole is provided on the connecting plate on the other side of the reinforcing fabric. The other end of the reinforcing steel cable passes through the through hole and is connected to the connecting plate on that side.

[0013] As an improvement to the above solution, the fatigue crack reinforcement device for the steel box girder further includes a length adjustment sleeve. The length adjustment sleeve includes a fixed sleeve and a rotating sleeve fitted outside the fixed sleeve. The fixed sleeve is fitted outside the reinforcement steel cable and fixedly connected to the reinforcement steel cable. The rotating sleeve is rotatably connected to the fixed sleeve and can rotate relative to the fixed sleeve. The outer wall of the rotating sleeve is provided with threads, and the inner wall of the perforation is provided with threads that mesh with the rotating sleeve. The rotating sleeve can be screwed into or out of the perforation.

[0014] As an improvement to the above solution, the reinforcing fabric is made of one or more of CFRP, GFRP and BFRP materials, and an adhesive layer is provided between the reinforcing fabric and the fatigue crack of the steel box girder.

[0015] Implementing this utility model has the following beneficial effects:

[0016] This utility model relates to a fatigue crack reinforcement device for steel box girders, comprising a reinforcement fabric and a fixing mechanism. The reinforcement fabric is positioned at the fatigue crack in the steel box girder to reinforce and strengthen the crack. The fixing mechanism is located on both sides of the reinforcement fabric to secure it. To reduce construction difficulty, the fixing mechanism includes a first magnetic block and a second magnetic block, distributed at the corners of the reinforcement fabric. When the reinforcement fabric needs to be fixed, the first and second magnetic blocks magnetically connect to the surface of the steel box girder, generating an adsorption force that quickly fixes the reinforcement fabric. During construction, there is no need to install bolts in multiple locations, reducing construction difficulty, simplifying operation, and improving construction efficiency. Furthermore, since the first and second magnetic blocks are controlled by current, there is no risk of rust or corrosion, ensuring long-term stable use and high reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the fatigue crack reinforcement device for steel box girders of this utility model;

[0018] Figure 2 yes Figure 1 A magnified view of part A in the image. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0020] See Figure 1This utility model discloses a fatigue crack reinforcement device for steel box girders, including a reinforcement fabric 1 and a fixing mechanism 2. The reinforcement fabric 1 is disposed at the fatigue crack location of the steel box girder. Before installing the reinforcement fabric 1, the fatigue cracked area of ​​the steel box girder requiring reinforcement is marked, positioned, and ground. After cleaning, structural adhesive is evenly applied to the area, and then the reinforcement fabric 1 is tightly adhered to the area. The reinforcement fabric 1 has high specific strength and specific stiffness, and together with the adhesive, it can effectively inhibit the development of cracks in the steel box girder, significantly improving the service life of the structure. The fixing mechanism 2 is disposed on both sides of the reinforcement fabric 1 and abuts against the reinforcement fabric 1. The fixing mechanism 2 can further reinforce the reinforcement fabric 1 and improve the connection strength between the reinforcement fabric 1 and the steel box girder. To improve ease of operation and reduce construction difficulty, the fixing mechanism 2 includes a first magnetic block 21 and a second magnetic block 22. The first magnetic block 21 and the second magnetic block 22 can generate magnetic attraction force through current control. The sides of the first magnetic block 21 and the second magnetic block 22 are connected to each other to improve the connection strength between them. The bottoms of the first magnetic block 21 and the second magnetic block 22 are in contact with the reinforcing fabric 1. After generating magnetic attraction force, they can be magnetically connected to the steel box girder, thereby pressing and fixing the reinforcing fabric 1.

[0021] The beneficial effects of this utility model embodiment are as follows:

[0022] This utility model embodiment of the fatigue crack reinforcement device for steel box girders includes a reinforcement fabric 1 and a fixing mechanism 2. The reinforcement fabric 1 is disposed at the fatigue crack of the steel box girder to reinforce and strengthen the fatigue crack. The fixing mechanism 2 is disposed on both sides of the reinforcement fabric 1 to fix the reinforcement fabric 1. To reduce construction difficulty, the fixing mechanism 2 includes a first magnetic block 21 and a second magnetic block 22, which are distributed at the corners of the reinforcement fabric 1. When it is necessary to fix the reinforcement fabric 1, the first magnetic block 21 and the second magnetic block 22 can magnetically connect with the surface of the steel box girder, and the resulting adsorption force can quickly fix the reinforcement fabric 1. During construction, there is no need to install bolts in multiple places, which reduces construction difficulty, simplifies operation, and improves construction efficiency. Moreover, since the first magnetic block 21 and the second magnetic block 22 are controlled by current, there is no risk of rust and corrosion, so they can be used stably for a long time and have high reliability.

[0023] In this embodiment of the invention, the reinforcing fabric 1 is made of one or more of CFRP, GFRP, and BFRP materials. CFRP is short for Carbon Fiber Reinforced Polymer / Plastic, a high-performance material composed of carbon fibers and matrices such as resin, graphene, metal, and ceramics, possessing many excellent properties such as light weight, high strength, corrosion resistance, and fatigue resistance. GFRP is short for Glass Fiber Reinforced Plastics, composed of glass fibers and matrices such as unsaturated polyester, epoxy resin, and phenolic resin, possessing properties such as light weight and hardness, non-conductivity, high mechanical strength, and corrosion resistance. BFRP is a new type of fiber-reinforced composite material manufactured by continuous basalt fibers and matrix materials through molding processes such as winding, molding, pultrusion, or melt blending, exhibiting higher stability and compatibility. CFRP, GFRP, and BFRP materials are characterized by high strength and lightweight, which can significantly improve the load-bearing capacity of structures such as steel box girders and provide excellent reinforcement for fatigue cracks. Furthermore, an adhesive layer (not shown in the attached diagram) is provided between the reinforcing fabric 1 and the fatigue crack in the steel box girder; the reinforcing fabric 1, in conjunction with the adhesive, can effectively reinforce the fatigue crack.

[0024] To adapt to different steel box girders and improve the connection stability of the reinforcing fabric 1 as needed, both the first magnetic block 21 and the second magnetic block 22 are equipped with adjusters (not shown in the attached figures). These adjusters can regulate the magnetic attraction force of the first magnetic block 21 and the second magnetic block 22. Specifically, the adjusters can adjust the current, causing a change in the magnetic field, thereby changing the magnetic attraction force of the first magnetic block 21 and the second magnetic block 22, thus adapting to different steel box girders or adjusting the connection stability of the reinforcing fabric 1. The adjuster includes a knob 23, which protrudes from the surfaces of the first magnetic block 21 and the second magnetic block 22, and the knob 23 can adjust the current within the adjuster.

[0025] To improve the connection strength between the first magnetic block 21 and the second magnetic block 22, a connecting plate 24 is provided between the first magnetic block 21 and the second magnetic block 22. One end of the connecting plate 24 is connected to the first magnetic block 21, and the other end of the connecting plate 24 is connected to the second magnetic block 22. Under the action of the connecting plate 24, the first magnetic block 21 and the second magnetic block 22 can form a whole, thereby improving the connection strength between the two.

[0026] In this embodiment of the utility model, the connecting plate 24 is a flexible plate with a certain deformation capacity, so it can adapt to the curved surface of the U-rib of the steel box girder. After fatigue cracks occur in the U-rib of the steel box girder, the reinforcing fabric 1 is set around the curved surface, and the connecting plate 24 can span the curved surface of the U-rib. The first magnetic block 21 and the second magnetic block 22 located on both sides of the connecting plate 24 can clamp the reinforcing fabric 1 on both sides of the U-rib, thus having a wide applicability.

[0027] Furthermore, the fixing mechanism 2 also includes a rib plate 25, which is triangular in shape and is respectively connected between the first magnetic block 21 and the connecting plate 24 and between the second magnetic block 22 and the connecting plate 24. The rib plate 25 can improve the connection strength between the first magnetic block 21 and the second magnetic block 22 and the connecting plate 24.

[0028] When fixing the reinforcing fabric 1, the fixing mechanism 2 further includes a pre-pressure plate 26, which abuts against the reinforcing fabric 1, allowing for a larger contact area to fix the reinforcing fabric 1. A connecting plate 24 spans the pre-pressure plate 26, with its bottom abutting against and pressing against the pre-pressure plate 26. During construction, the reinforcing fabric 1 is first pasted, then the pre-pressure plate 26 is used to press the sides of the reinforcing fabric 1. Next, the first magnetic block 21 and the second magnetic block 22 are used to fix the corners of the reinforcing fabric 1, while the connecting plate 24 presses against the pre-pressure plate 26.

[0029] Furthermore, the connecting plate 24 is provided with an adjusting bolt 27, which can pass through the connecting plate 24 and connect to the pre-pressing plate 26. Using the adjusting bolt 27, the degree of compression of the connecting plate 24 on the pre-pressing plate 26 can be adjusted, thereby further improving the connection strength of the reinforcing fabric 1.

[0030] In addition, the fatigue crack reinforcement device for the steel box girder also includes a reinforcement cable 3. The reinforcement cable 3 is connected between the fixing mechanisms 2 on both sides of the reinforcement fabric 1. The reinforcement cable 3 spans across the preload plate 26 and abuts against the preload plate 26. The reinforcement cable 3 fixes and limits the reinforcement fabric 1 with a larger span, and also spans across the preload plate 26 to make the preload plate 26 more stably fixed.

[0031] The length direction of the reinforcing steel cable 3 is perpendicular to the length direction of the connecting plate 24, and it cooperates with the connecting plate 24 to fix and limit the reinforcing fabric 1 in two directions. One end of the reinforcing steel cable 3 is connected to the side of the connecting plate 24 on one side of the reinforcing fabric 1. The connecting plate 24 on the other side of the reinforcing fabric 1 is provided with a through hole 241. The other end of the reinforcing steel cable 3 passes through the through hole 241 and is connected to the connecting plate 24 on that side. The reinforcing steel cable 3 also constitutes a connection between the two fixing mechanisms 2, so that the fixing mechanisms 2 on both sides can form a whole and improve the overall strength.

[0032] See Figure 2 In order to adjust the tightness of the reinforcing steel cable 3, the fatigue crack reinforcement device for the steel box girder also includes a length adjusting sleeve 4. The length adjusting sleeve 4 can finely adjust the length of the reinforcing steel cable 3 between the two fixing mechanisms 2, thereby adjusting the preload between the reinforcing steel cable 3 and the reinforcing fabric 1. Specifically, the length adjusting sleeve 4 includes a fixed sleeve 42 and a rotating sleeve 41 sleeved outside the fixed sleeve 42. The fixed sleeve 42 is sleeved outside the reinforcing steel cable 3 and fixed to the reinforcing steel cable 3. The fixed sleeve 42 can drive the reinforcing steel cable 3 to move, while the rotating sleeve 41 rotates and connects... Attached to the fixed sleeve 42, the rotating sleeve 41 can rotate relative to the fixed sleeve 42. When the rotating sleeve 41 moves horizontally, it can drive the fixed sleeve 42 to move, thereby driving the reinforcing steel cable 3 to move. The outer wall of the rotating sleeve 41 is provided with threads, and the inner wall of the through hole 241 is provided with threads that mesh with the rotating sleeve 41. The rotating sleeve 41 can be screwed into or out of the through hole 241. By screwing into or out of the through hole 241, the rotating sleeve 41 can move relative to the through hole 241, thereby tightening or loosening the reinforcing steel cable 3 to adjust the pre-compression degree of the reinforcing fabric 1.

[0033] During construction, the fatigue-cracking areas of the steel box girder requiring reinforcement are first marked and cleaned. After cleaning, structural adhesive is evenly applied to these areas. The reinforcing fabric 1 is then tightly adhered to these areas. After adhesion, the pre-stressing plate 26 is used to cover the sides of the reinforcing fabric 1. The first magnetic block 21 and the second magnetic block 22 are then attached to the corners of the reinforcing fabric 1. At this point, the connecting plate 24 and the reinforcing steel cable 3 can press the pre-stressing plate 26 and the reinforcing fabric 1 tightly. Finally, the adjusting bolt 27 is used to adjust the connection strength between the connecting plate 24 and the pre-stressing plate 26, and the rotating sleeve 41 is used to adjust the pre-compression degree between the reinforcing steel cable 3 and the reinforcing fabric 1, thus completing the construction. The process is simple, convenient, and efficient with short construction time.

[0034] The above are preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A fatigue crack reinforcement device for steel box girders, characterized in that, It includes a reinforcing fabric and a fixing mechanism. The reinforcing fabric is disposed at the fatigue crack of the steel box girder, and the fixing mechanism is disposed on both sides of the reinforcing fabric and abuts against the reinforcing fabric. The fixing mechanism includes a first magnetic block and a second magnetic block. The sides of the first magnetic block and the second magnetic block are connected to each other, and the bottoms of the first magnetic block and the second magnetic block abut against the reinforcing fabric. The first magnetic block and the second magnetic block can be magnetically connected to the steel box girder.

2. The fatigue crack reinforcement device for steel box girders according to claim 1, characterized in that, Both the first magnetic block and the second magnetic block are equipped with an adjuster, which can adjust the magnitude of the magnetic attraction force of the first magnetic block and the second magnetic block. The adjuster includes a knob that protrudes from the surface of the first magnetic block and the second magnetic block.

3. The fatigue crack reinforcement device for steel box girders according to claim 1, characterized in that, A connecting plate is provided between the first magnetic block and the second magnetic block. One end of the connecting plate is connected to the first magnetic block, and the other end of the connecting plate is connected to the second magnetic block. The connecting plate is a flexible plate.

4. The fatigue crack reinforcement device for steel box girders according to claim 3, characterized in that, The fixing mechanism also includes ribs, which are triangular in shape and are respectively connected between the first magnetic block and the connecting plate, and between the second magnetic block and the connecting plate.

5. The fatigue crack reinforcement device for steel box girders according to claim 3, characterized in that, The fixing mechanism also includes a pre-pressure plate that abuts against the reinforcing fabric, a connecting plate that spans the pre-pressure plate, and the bottom of the connecting plate abuts against the pre-pressure plate and can press the pre-pressure plate tightly.

6. The fatigue crack reinforcement device for steel box girders according to claim 5, characterized in that, The connecting plate is provided with an adjusting bolt, which can pass through the connecting plate and connect to the pre-pressing plate. The adjusting bolt can adjust the degree of compression of the connecting plate on the pre-pressing plate.

7. The fatigue crack reinforcement device for steel box girders according to claim 5, characterized in that, The fatigue crack reinforcement device for the steel box girder also includes a reinforcing steel cable, which is connected between the fixing mechanisms on both sides of the reinforcing fabric and spans across the preload plate and abuts against the preload plate.

8. The fatigue crack reinforcement device for steel box girders according to claim 7, characterized in that, The length direction of the reinforcing steel cable is perpendicular to the length direction of the connecting plate. One end of the reinforcing steel cable is connected to the side of the connecting plate on one side of the reinforcing fabric. The connecting plate on the other side of the reinforcing fabric has a through hole. The other end of the reinforcing steel cable passes through the through hole and is connected to the connecting plate on that side.

9. The fatigue crack reinforcement device for steel box girders according to claim 8, characterized in that, The fatigue crack reinforcement device for the steel box girder also includes a length adjustment sleeve, which includes a fixed sleeve and a rotating sleeve fitted outside the fixed sleeve. The fixed sleeve is fitted outside the reinforcing steel cable and fixedly connected to the reinforcing steel cable. The rotating sleeve is rotatably connected to the fixed sleeve and can rotate relative to the fixed sleeve. The outer wall of the rotating sleeve is provided with threads, and the inner wall of the perforation is provided with threads that mesh with the rotating sleeve. The rotating sleeve can be screwed into or out of the perforation.

10. The fatigue crack reinforcement device for steel box girders according to claim 1, characterized in that, The reinforcing fabric is made of CFRP, GFRP or BFRP material, and an adhesive layer is provided between the reinforcing fabric and the fatigue crack of the steel box girder.

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