CFRP reinforcing device for fatigue crack of steel bridge
By designing a steel bridge fatigue crack reinforcement device combining CFRP plate, telescopic shell and rebar, the problems of stress concentration and new cracks caused by existing reinforcement methods are solved, and the effect of reducing fatigue stress and extending bridge life is achieved.
Patent Information
- Application Number
- CN202422683445.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-11-05
AI Technical Summary
Existing methods for strengthening fatigue cracks of steel bridges, such as welding and connecting parts, can easily lead to stress concentration, which will lead to new cracks and irreversible damage.
A CFRP reinforcement device for fatigue cracks of steel bridges is designed, adopting a combined structure of CFRP plate, telescopic shell, telescopic block and rebar. The CFRP plate is bent in a Z-shaped shape, and the telescopic shell and telescopic block are stablely connected through the fitting of the card block, the slot and the thread.
Through the high temperature resistance, mechanical stability and low thermal expansion coefficient of the CFRP plate, the stress concentration of steel components is reduced, the occurrence of new cracks is reduced, the connection stability is increased, and the service life of the bridge is extended.
Smart Images
Figure CN223017462U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of steel bridge fatigue cracks, and particularly relates to a CFRP reinforcement device for steel bridge fatigue cracks. Background Technique
[0002] The main function of the structure for inhibiting fatigue cracking of steel members is to reduce the stress concentration at the cracked position, so that the crack will not expand under the continuous action of dynamic loads; in recent years, the number of newly built bridges has been increasing continuously. In the construction of long-span bridges, steel structures are mainly used. The dynamic loads generated by vehicle driving on the bridge are likely to cause fatigue cracking of steel members on the bridge under long-term action. Therefore, the development of structures that can effectively inhibit fatigue cracking of steel members has great development prospects.
[0003] Currently, the commonly used methods for inhibiting crack propagation are: welding with electrodes at the crack to achieve the effect of inhibiting crack propagation; or fixing connectors on the steel members on both sides of the crack, and then pulling the two connectors with bolts to inhibit crack propagation. However, when using electrode welding, stress concentration will inevitably occur at the weld. When using bolts to pull the two connectors, the stress will concentrate at the connection between the two connectors and the steel member. Under continuous fatigue loads, new cracks will inevitably appear at the weld or the connection between the connector and the steel member, causing irreversible damage to the steel members on the bridge. Therefore, there is a need to avoid stress concentration at the reinforcement position of steel member cracks.
[0004] Therefore, a CFRP reinforcement device for steel bridge fatigue cracks is proposed to solve the above drawbacks. Content of the Utility Model
[0005] The purpose of the utility model is to provide a CFRP reinforcement device for steel bridge fatigue cracks with simple structure and reasonable design to solve the problem that new cracks will appear at the connection of steel members when using electrode welding or connector connection.
[0006] The utility model realizes the above purpose through the following technical solutions:
[0007] A CFRP reinforcement device for steel bridge fatigue cracks includes a telescopic shell, a telescopic block and a deformed steel bar. The telescopic shell and the telescopic block are both symmetrically arranged. The telescopic shell has a concave structure. The concave openings of the two telescopic shells face each other. The two telescopic blocks are arranged between the two telescopic shells. A clamping block and a clamping groove are respectively arranged on the surfaces of the two telescopic blocks close to each other. The clamping block is movably clamped in the clamping groove;
[0008] One end of each of the two telescopic blocks away from each other is movably inserted into the corresponding telescopic shell, and a CFRP board is arranged between the end of the telescopic block and the inside of the telescopic shell;
[0009] The deformed steel bar is used for connecting between the telescopic shell and an external fixture;
[0010] Both the upper and lower surfaces of the telescopic block are provided with telescopic chutes. Both concave ends of the telescopic shell are fixedly provided with telescopic sliders. The telescopic sliders are slidably arranged in the corresponding telescopic chutes. Between the end of the telescopic slider away from the deformed steel bar and the inner wall of the telescopic chute is sealed by a rubber pad.
[0011] As a further optimized solution of the present utility model, a magnetic plate and a magnetic strip are respectively fixedly provided on the surface of the rubber pad close to the middle of the telescopic shell and the bottom surface of the telescopic chute. There are multiple magnetic plates. The multiple magnetic plates are arranged at equal distances. The multiple magnetic plates and the magnetic strip repel each other. The magnetic strip is laid along the bottom surface of the telescopic chute.
[0012] As a further optimized solution of the present utility model, the CFRP plate has a plate-like structure that bends back and forth in a Z shape.
[0013] As a further optimized solution of the present utility model, a hollow groove is provided in the middle of the telescopic block.
[0014] As a further optimized solution of the present utility model, an embedded groove is provided on the inner wall of the telescopic shell. A nut is provided in the embedded groove. The end of the deformed steel bar extends into the embedded groove movably, and the end of the deformed steel bar extending into the embedded groove is in threaded fit connection with the nut.
[0015] As a further optimized solution of the present utility model, the deformed steel bar is U-shaped.
[0016] As a further optimized solution of the present utility model, the deformed steel bar is fixed on an external steel member through a nut or fixed on an external concrete member by pouring.
[0017] The beneficial effects of the present utility model are as follows: The present utility model utilizes the high temperature resistance, mechanical stability, and small coefficient of thermal expansion of the CFRP plate itself to reduce the occurrence of new cracks in the steel member. Moreover, the CFRP plate has a plate-like structure that bends back and forth in a Z shape. There are two CFRP plates. The two CFRP plates are respectively arranged between the telescopic shell and the telescopic block. When the two telescopic shells are subjected to stress pulling, the CFRP plates are compressed and released to further reduce the stress pulling effect, increase the connection stability between the steel members, effectively reduce the fatigue stress, and reduce the occurrence of new cracks.
[0018] Whether the rubber pad is compressed or stretched when the telescopic block expands and contracts, the rubber pad can maintain a certain saturation capacity through the repulsive force between the magnetic plate and the magnetic strip, avoiding the phenomenon that impurities such as stones are stuck in the telescopic chute, and thus ensuring that the expansion and contraction of the telescopic block are not affected by external impurity factors, which is relatively practical.
[0019] In the utility model, the ribbed steel is U-shaped. When the telescopic shell is connected to a steel member or an external concrete member, the ribbed steel structure can connect the positions fixed at two points together, achieving the purpose of increasing the connection stability.
[0020] In the utility model, the ribbed steel can be connected not only to steel members but also to concrete members, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 is a schematic structural view of the CFRP reinforcement device for fatigue cracks of the steel bridge of the utility model;
[0022] Figure 2 is of the utility model Figure 1 Schematic enlarged view of the structure at A;
[0023] Figure 3 is a sectional view of the CFRP reinforcement device for fatigue cracks of the steel bridge of the utility model;
[0024] Figure 4 is a schematic structural view of the CFRP reinforcement device for fatigue cracks of the steel bridge of the utility model connected to a steel member;
[0025] Figure 5 is a schematic structural view of the CFRP reinforcement device for fatigue cracks of the steel bridge of the utility model connected to a concrete member.
[0026] In the figure: telescopic shell 1, telescopic block 2, CFRP plate 3, ribbed steel 4, hollow groove 5, clamping block 6, clamping groove 7, rubber pad 8, telescopic sliding groove 9, telescopic sliding block 10, magnetic plate 11, magnetic strip 12, nut 13, embedded groove 14, steel member 15, concrete member 16. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0028] As Figures 1 to 5As shown in the figure, to solve the problem that new cracks may appear at the joints of steel members when welding with electrodes or connecting with connectors, the utility model provides a CFRP reinforcement device for fatigue cracks of steel bridges, which can utilize the high temperature resistance, mechanical stability and small coefficient of thermal expansion of the CFRP plate 3 itself to reduce the occurrence of new cracks in steel members. The CFRP plate 3 is in a plate-like structure bent back and forth in a Z shape. There are two CFRP plates 3, and the two CFRP plates 3 are respectively arranged between the telescopic shell 1 and the telescopic block 2. When the two telescopic shells 1 are subjected to stress pulling, the CFRP plate 3 is compressed and released, so as to further reduce the stress pulling effect, increase the connection stability between steel members, effectively reduce the fatigue stress, and reduce the occurrence of new cracks.
[0029] The specific structure of the utility model includes a telescopic shell 1, a telescopic block 2 and a deformed steel bar 4. The telescopic shell 1 and the telescopic block 2 are both symmetrically arranged. The telescopic shell 1 is in a concave-shaped structure, and the concave-shaped openings of the two telescopic shells 1 face each other. The two telescopic blocks 2 are arranged between the two telescopic shells 1. A clamping block 6 and a clamping groove 7 are respectively arranged on the surfaces of the two telescopic blocks 2 close to each other, and the clamping block 6 is movably clamped in the clamping groove 7; the two ends of the two telescopic blocks 2 away from each other are respectively movably inserted into the corresponding telescopic shells 1, and the CFRP plate 3 is arranged between the end of the telescopic block 2 and the inside of the telescopic shell 1; the deformed steel bar 4 is used to connect between the telescopic shell 1 and an external fixture; telescopic sliding grooves 9 are arranged on the upper and lower surfaces of the telescopic block 2, and telescopic sliding blocks 10 are fixedly arranged at both ends of the concave shape of the telescopic shell 1, and the telescopic sliding blocks 10 are slidably arranged in the corresponding telescopic sliding grooves 9. An embedded groove 14 is arranged on the inner wall of the telescopic shell 1, and a nut 13 is arranged in the embedded groove 14. The end of the deformed steel bar 4 extends into the embedded groove 14 movably, and the end of the deformed steel bar 4 extending into the embedded groove 14 is threadedly connected with the nut 13; when installing the CFRP reinforcement device for fatigue cracks of steel bridges, there is an installation space of about 10 - 15 CM between the two steel members 15. First, make the deformed steel bar 4 pass through the reserved hole on the steel member 15, and use the nut 13 to fix the deformed steel bar 4 on the steel member 15. Then, use the nut 13 to install at the end of the deformed steel bar 4 to connect the deformed steel bar 4 with the telescopic shell 1. After connecting the two telescopic shells 1, stuff the CFRP plate 3 into the inside of the telescopic shell 1, and then install and clamp the two telescopic blocks 2 into the inside of the telescopic shell 1 in sequence. The wall bodies on the upper and lower surfaces of the telescopic shell 1 can elastically deform within a certain range, which is sufficient for the telescopic block 2 to be clamped and installed. After that, the two telescopic blocks 2 are butted, and the clamping block 6 is clamped in the clamping groove 7 to complete the preliminary installation.
[0030] The CFRP reinforcement device for fatigue cracks of a steel bridge that has completed the preliminary installation can achieve the purpose of reducing the appearance of new cracks at the joints of steel members 15. When the steel member 15 is stressed and compresses the telescopic shell 1, the telescopic slider 10 at the end of the telescopic shell 1 slides in the telescopic chute 9, and the CFRP plate 3 inside the telescopic shell 1 is compressed or released, thereby reducing stress. The CFRP plate 3 is made of carbon composite materials and has the advantages of being light, high-temperature resistant, having mechanical stability, and a small coefficient of thermal expansion. It is particularly suitable for installation at the joints of steel members 15 and will not cause additional stress damage to the steel members 15.
[0031] In the present utility model, a hollow groove 5 is provided in the middle of the telescopic block 2, which additionally reduces the weight of the material, reduces costs, and reduces the phenomenon that the stability of the joint of the steel member 15 is affected by heavier materials.
[0032] Furthermore, between the end of the telescopic slider 10 far from the deformed steel bar 4 and the inner wall of the telescopic chute 9, it is sealed by a rubber pad 8; on one side of the rubber pad 8 close to the middle of the telescopic shell 1 and the bottom surface of the telescopic chute 9, magnetic plates 11 and magnetic strips 12 are respectively fixedly provided. There are multiple magnetic plates 11, and the multiple magnetic plates 11 are arranged at equal distances. The multiple magnetic plates 11 and the magnetic strips 12 repel each other, and the magnetic strips 12 are laid along the bottom surface of the telescopic chute 9; using the rubber pad 8 with magnetic plates 11 to seal at the opening of the telescopic chute 9 can prevent impurities such as stones from entering the telescopic chute 9 and affecting the telescopic movement of the telescopic block 2 when stressed. Specifically, whether the telescopic block 2 compresses or stretches the rubber pad 8 during telescopic movement, the rubber pad 8 can maintain a certain saturation capacity through the repulsive force between the magnetic plates 11 and the magnetic strips 12, avoiding the phenomenon that impurities such as stones are stuck in the telescopic chute 9, and thus ensuring that the telescopic movement of the telescopic block 2 is not affected by external impurity factors, which is relatively practical.
[0033] In the present utility model, the deformed steel bar 4 is U-shaped. When the telescopic shell 1 is connected to the steel member 15 or an external concrete member 16, the structure of the deformed steel bar 4 can connect the positions fixed at two points together, achieving the purpose of increasing the connection stability.
[0034] In the present utility model, the deformed steel bar 4 can not only be connected to the steel member 15 but also to the concrete member 16, with a wide range of applications. Specifically, when the deformed steel bar 4 is connected to an external concrete member 16, it can be directly cast and fixed in the concrete member 16, which is convenient for connection. Moreover, in the present utility model, the telescopic shell 1, the telescopic block 2, the CFRP plate 3, and the deformed steel bar 4 are all independently arranged. When damaged, they can be replaced separately, reducing the maintenance cost, and the replacement is also relatively simple. Just remove the telescopic block 2, the CFRP plate 3, and the telescopic shell 1 in sequence. It is also possible to replace the CFRP reinforcement device for fatigue cracks of the steel bridge with a suitable model according to the change in the distance between the two steel members 15 in the later stage, replacing the unstable connection method by adhesive fixation in the prior art.
[0035] The above embodiments only illustrate several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can still be made, and these all belong to the protection scope of the present utility model.
Claims
1. A CFRP reinforcement device for fatigue cracks in steel bridges, comprising a telescopic shell (1), a telescopic block (2) and threaded steel (4), characterized in that: The telescopic shell (1) and the telescopic block (2) are both symmetrically arranged. The telescopic shell (1) is in a concave-shaped structure. The concave-shaped openings of the two telescopic shells (1) are opposite to each other. The two telescopic blocks (2) are arranged between the two telescopic shells (1). A clamping block (6) and a clamping groove (7) are respectively arranged on the mutually adjacent sides of the two telescopic blocks (2). The clamping block (6) is movably engaged in the clamping groove (7). The ends of the two telescopic blocks (2) that are away from each other are respectively movably inserted into the corresponding telescopic shells (1), and a CFRP plate (3) is provided between the ends of the telescopic blocks (2) and the interior of the telescopic shell (1); The threaded steel (4) is used to connect between the telescopic shell (1) and an external fixture; The upper and lower surfaces of the telescopic block (2) are both provided with telescopic slide grooves (9), and the concave ends of the telescopic shell (1) are both fixedly provided with telescopic sliders (10), and the telescopic sliders (10) are slidably arranged in the corresponding telescopic slide grooves (9), and the end of the telescopic slider (10) away from the threaded steel bar (4) is sealed with the inner wall of the telescopic slide groove (9) by a rubber pad (8).
2. A CFRP reinforcement device for fatigue cracks of steel bridges according to claim 1, characterized in that: A magnetic plate (11) and a magnetic strip (12) are fixedly arranged on one side of the rubber pad (8) close to the middle of the telescopic shell (1) and on the bottom surface of the telescopic slide groove (9), respectively. A plurality of magnetic plates (11) are arranged, and the plurality of magnetic plates (11) are arranged at equal distances. The plurality of magnetic plates (11) and the magnetic strip (12) repel each other, and the magnetic strip (12) is laid along the bottom surface of the telescopic slide groove (9).
3. The CFRP reinforcement device for fatigue cracks of steel bridges according to claim 1, characterized in that: The CFRP plate (3) is a plate-like structure that bends back and forth in a Z shape.
4. The CFRP reinforcement device for fatigue cracks of steel bridges according to claim 1, characterized in that: A hollow groove (5) is provided in the middle of the telescopic block (2).
5. The CFRP reinforcement device for fatigue cracks of steel bridges according to claim 1, characterized in that: An embedded groove (14) is provided on the inner wall of the telescopic shell (1), a nut (13) is provided in the embedded groove (14), an end of the threaded steel bar (4) movably extends into the embedded groove (14), and one end of the threaded steel bar (4) movably extends into the embedded groove (14) is connected to the nut (13) by threaded fitting.
6. The CFRP reinforcement device for fatigue cracks of steel bridges according to claim 1, characterized in that: The threaded steel (4) is U-shaped.
7. The CFRP reinforcement device for fatigue cracks of steel bridges according to claim 1, characterized in that: The threaded steel bar (4) is fixed to an external steel component (15) by means of a nut (13) or is fixed to an external concrete component (16) by means of casting.