A pre-tensioning device for steel bridges in civil engineering

Abstract

The present invention discloses a pre-tensioning device for a steel bridge in civil engineering, wherein the two ends of a connecting rod are detachably connected to a slide track, a hydraulic jacking device is connected to the center position of the connecting rod in the length direction, two jacking rods are connected to the hydraulic jacking device, the two jacking rods are respectively located on both sides of the connecting rod, the other ends of the two jacking rods are connected to a CFRP anchoring device, each CFRP anchoring device is connected to a rolling connecting rod, and the two ends of the rolling connecting rod are respectively connected to a roller, and the rollers at the two ends are respectively located in the slide track of the first frame and the second frame on both sides. The present invention controls the tensioning by hydraulic pressure, which has lower labor intensity than manual tensioning, and is easy to control the tensioning force, thereby improving the tensioning efficiency, and improving the applicability and safety of the device; the present invention adopts the tensioning form at both ends, the force of the CFRP cloth is uniform, the prestress will not be lost, and it is suitable for repairing cracks in large-area flat steel plates.

Description

Technical Field

[0001] The invention relates to the technical field of bridge maintenance, in particular to a pre-tensioning device for a steel bridge in civil engineering. Background Art

[0002] At present, in the CFRP pre-tensioning technology for crack reinforcement of steel bridges in civil engineering, the CFRP pre-tensioning device is the most commonly used tensioning tool for engineers. The existing CFRP pre-tensioning device usually adopts a single-end tensioning form, that is, one end uses an anchor as a fixed end, and the other end uses a movable anchor, and uses a jack for tensioning to complete the tensioning anchoring. Such a construction method will cause uneven force on the carbon fiber, resulting in the problem of prestress loss. The prestress loss is generally around 15%, so there is a problem of small applied prestress. In addition, the existing pre-tensioning device has poor control over the tensioning degree through manual tensioning, and cannot achieve a suitable pre-tensioning effect. In addition, the existing pre-tensioning device is troublesome to install, difficult to fix on the surface of the steel plate, the anchoring process is not easy, and the anchoring angle cannot be adjusted, which is not conducive to improving the efficiency of fatigue crack repair of steel bridges. It has low practicality, poor functionality, low tensioning accuracy, insufficient reliability, and is not convenient for fixing the pre-tensioning device. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problems of the prior art such as small prestress, large prestress loss, difficult to control the tensioning degree and inconvenient installation, and to provide a prestressing device for steel bridges in civil engineering, which adopts hydraulic control of the tensioning degree, is easy to install, has large prestressing, and allows CFRP cloth to be more evenly stressed.

[0004] The present invention adopts the following technical solution:

[0005] A pre-tensioning device for a steel bridge in civil engineering comprises a first frame and a second frame arranged in parallel, and two inner side walls of the first frame and the second frame arranged opposite to each other are provided with rectangular slide tracks, and the slide track is opened along the length direction of the first frame and the second frame, and a connecting rod is detachably connected between the first frame and the second frame, and the connecting rod is perpendicular to the first frame and the second frame, and two ends of the connecting rod are detachably connected to the slide track, and a hydraulic jacking device is connected to the center position of the length direction of the connecting rod, and two jacking rods are connected to the hydraulic jacking device, and the two jacking rods are respectively located on both sides of the connecting rod, and the other ends of the two jacking rods are connected to a CFRP anchoring device, and the CFRP anchoring device has two, which are respectively arranged on both sides of the connecting rod, and each CFRP anchoring device is connected to a rolling connecting rod, and the rolling connecting rod has two, which are respectively arranged on both sides of the connecting rod, and a roller is connected to each end of the rolling connecting rod, and the rollers at both ends are respectively located in the slide track of the first frame and the second frame on both sides.

[0006] Furthermore, a fixing device is provided in each of the two slide groove tracks, and a connecting bayonet is provided at the connection between the fixing device and the connecting rod, and both ends of the connecting rod are connected to the connecting bayonet. The fixing device cannot move or slide in the slide groove track.

[0007] Preferably, anti-collision pads are connected to the two side walls of the fixing device on both sides of the connecting rod to prevent the rollers on both sides from rolling to the vicinity of the fixing device under the action of the hydraulic jacking device and hitting the fixing device.

[0008] Furthermore, multiple LED lights are arranged on the connecting rods on both sides of the hydraulic jacking device, which can improve the clarity of vision, facilitate the staff to debug and install the entire device conveniently, and enhance the functionality and practicality of the pre-tensioning device.

[0009] Furthermore, the bottoms of the first frame and the second frame are respectively connected to magnetic bases through connecting rods. The magnetic fixing method is convenient for the arrangement of the device, conducive to the completion of the fixing process, simple and quick operation, improving the convenience of the device, reducing labor intensity, and improving work efficiency.

[0010] Preferably, a handle is installed on the outer side wall of the first frame body and / or the second frame body, and an anti-slip strip is provided on the outer side of the handle, so as to facilitate transportation, carrying and installation.

[0011] The present invention has the following beneficial effects:

[0012] The present invention controls the tensioning by hydraulic pressure, which has lower labor intensity than manual tensioning, and is easy to control the tensioning force, thereby improving the tensioning efficiency and improving the applicability and safety of the device. The present invention adopts the tensioning form at both ends, and the CFRP cloth is evenly stressed, without losing prestress, and is suitable for repairing cracks in large-area flat steel plates. The present invention uses magnetic fixing to make it easy to fix the entire device on the surface of the steel plate, and other structural parts are connected together in detachable ways such as plug-in and clip-on, so that the pre-tensioning device is easy to install. Because the CFRP anchoring device moves with the rolling of the rolling connecting rod in the slide groove, the anchoring angle is convenient to adjust, and the fatigue crack repair efficiency of the steel bridge is improved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Shows the top view structure of the present invention;

[0014] Figure 2 The three-dimensional structure of the present invention is shown;

[0015] Figure 3 The structure of the crash pad is shown;

[0016] Figure 4 The connection structure between the magnetic base and the frame is shown;

[0017] Figure 5 A bottom view structure of the present invention is shown. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0019] See also Figure 1-5 A pre-tensioning device for a steel bridge in civil engineering comprises two parallel first frames 10 and second frames 11. The first frames 10 and second frames 11 are provided with rectangular slide tracks 4 on two inner side walls arranged opposite to each other. The slide tracks are provided along the length direction of the first frames 10 and second frames. A connecting rod 12 is detachably connected between the first frames 10 and second frames. The connecting rod is perpendicular to the first frames 10 and second frames. Both ends of the connecting rod are detachably connected to the slide tracks. A hydraulic jack is connected to the center of the length direction of the connecting rod. Device 7, two jacking rods 15 are connected to the hydraulic jacking device, and the two jacking rods 15 are respectively located on both sides of the connecting rod. The other ends of the two jacking rods are connected to a CFRP anchoring device 16. There are two CFRP anchoring devices, which are respectively arranged on both sides of the connecting rod. Each CFRP anchoring device is connected to a rolling connecting rod 17. There are two rolling connecting rods, which are respectively arranged on both sides of the connecting rod. A roller 5 is connected to each end of the rolling connecting rod, and the rollers at both ends are respectively located in the slide groove tracks of the first frame 10 and the second frame 11 on both sides.

[0020] A fixing device is provided in each of the two slide groove tracks. The fixing device cannot move or slide in the slide groove track. A connecting bayonet 13 is provided at the connection between the fixing device and the connecting rod. Both ends of the connecting rod are connected to the connecting bayonet.

[0021] The two side walls of the fixing device on both sides of the connecting rod are connected with anti-collision pads 6 to prevent the rollers on both sides from rolling to the vicinity of the fixing device and hitting the fixing device under the action of the hydraulic jacking device. The hydraulic jacking device can be composed of two jacks, and the jacking rods of the two jacks are respectively located on both sides of the connecting rod. The hydraulic jacking device can also be installed with a battery, a control circuit, a liquid crystal display and a control switch 9. The operation of the hydraulic jacking device is controlled by the control switch and the control circuit. The battery supplies power to the control switch and the control circuit. The control circuit can also be connected to an external USB charging interface 19 to charge the battery. The liquid crystal display can display the battery power. By setting the liquid crystal display and the control switch 9, the visibility and controllability of the pre-tensioning device can be improved. The staff can intuitively check the battery power through the liquid crystal display. When the power is insufficient, it can be replenished in time through the USB charging interface 19, which can improve the continuity of the operation of the entire device. These can be achieved through existing electrical and communication technologies, and will not be repeated here.

[0022] A plurality of LED lighting lamps 14 are arranged on the connecting rods on both sides of the hydraulic jacking device, which can improve the clarity of the field of vision, facilitate the staff to conveniently debug and install the entire device, and enhance the functionality and practicality of the pre-tensioning device.

[0023] The bottom of the first frame 10 and the second frame are respectively connected to the magnetic base 2 through the connecting rod 3. The connecting rod 3 is arranged on the top of the magnetic base. The connecting rod 3 and the magnetic base can be connected by a snap connection or a plug connection. The connecting rod 3 is connected to the bottom of the first frame 10 and the second frame by a snap connection or a plug connection. The magnetic base is fixed to the steel bridge by magnetic attraction. The snap connection method is adopted to facilitate the installation and disassembly of the entire device, and the operation is simple and quick, which is conducive to the later maintenance and maintenance, and prolongs the service life.

[0024] A handle 21 is installed on the outer side wall of the second frame body 11 and / or the first frame body, and an anti-slip strip 22 is arranged on the outer side of the handle to facilitate transportation, carrying and installation.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pre-tensioning device for a steel bridge in civil engineering, characterized in that: The invention comprises a first frame body and a second frame body which are arranged in parallel, and two inner side walls of the first frame body and the second frame body which are arranged opposite to each other are provided with rectangular slide groove tracks, and the slide groove tracks are opened along the length direction of the first frame body and the second frame body, and a connecting rod is detachably connected between the first frame body and the second frame body, and the connecting rod is perpendicular to the first frame body and the second frame body, and two ends of the connecting rod are detachably connected to the slide groove tracks, and a hydraulic jacking device is connected to the center position of the length direction of the connecting rod, and two jacking rods are connected to the hydraulic jacking device, and the two jacking rods are respectively located on both sides of the connecting rod, and the other ends of the two jacking rods are connected to a CFRP anchoring device, and the CFRP anchoring devices have two, which are respectively arranged on both sides of the connecting rod, and each CFRP anchoring device is connected to a rolling connecting rod, and the rolling connecting rod has two, which are respectively arranged on both sides of the connecting rod, and the two ends of the rolling connecting rod are respectively connected to a roller, and the rollers at both ends are respectively located in the slide groove tracks of the first frame body and the second frame body on both sides; A plurality of LED lighting lamps are arranged on the connecting rods on both sides of the hydraulic jacking device; the bottoms of the first frame and the second frame are respectively connected to magnetic bases through connecting rods.

2. A pre-tensioning device for a steel bridge in civil engineering according to claim 1, characterized in that: A fixing device is arranged in each of the two slide groove tracks. A connecting bayonet is provided at the connection between the fixing device and the connecting rod, and two ends of the connecting rod are connected in the connecting bayonet.

3. The pre-tensioning device for a steel bridge in civil engineering according to claim 2, characterized in that: Anti-collision pads are connected to the two side walls of the fixing device located on both sides of the connecting rod.

4. The pre-tensioning device for a steel bridge in civil engineering according to claim 1, characterized in that: A handle is installed on the outer side wall of the first frame body and / or the second frame body, and an anti-slip strip is arranged on the outer side of the handle.

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