Prestressed box girder top plate shear rib positioning device

Abstract

The utility model discloses a prestressed box girder top plate shear rib positioning device which comprises two prestressed rib positioning frames. A plurality of arc-shaped positioning plates are movably mounted on the two prestressed tendon positioning frames, and the same adjusting structure is mounted on the two arc-shaped positioning plates on the same side; after the device is installed, the distance between the prestressed tendon positioning frames on the two sides can be adjusted by rotating the connecting frame and the threaded sleeve, and the scale position, pointed by the pointing arrow, of the graduated scale can change along with movement of the prestressed tendon positioning frames, so that the distance of the prestressed tendon positioning frames during movement can be judged; therefore, the adjusting degree of each position device of the prestressed tendon positioning frames can be conveniently adjusted, it is ensured that the laying time intervals of the two ends and the middle of every two adjacent prestressed tendon positioning frames are equal, the deviation of the distance between the two prestressed tendon positioning frames is reduced, and then the positioning effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, specifically to a positioning device for shear reinforcement in the top slab of a prestressed box girder. Background Technology

[0002] The main function of prestressed shear reinforcement in the top slab of a box girder is to enhance the load-bearing capacity of the top slab in the shear direction. In bridge structures, the top slab of a box girder is often subjected to shear forces from various external forces such as vehicle loads and wind loads. The installation of shear reinforcement can effectively resist these shear forces and prevent cracks or deformations in the top slab when it is under stress.

[0003] Chinese Patent Publication No. CN205874988U discloses a prestressed tendon positioning device for the top slab of a box girder. The device comprises a transverse prestressed tendon positioning frame, a prestressed tendon duct width adjuster, vertical prestressed tendon auxiliary positioning holes, and a prestressed tendon spacing adjuster. The transverse prestressed tendon positioning frame is connected to the box girder formwork via pins. The transverse prestressed tendon positioning frame is composed of two positioning frames connected by the prestressed tendon duct width adjuster. Adjacent transverse prestressed tendon positioning frames are connected by the prestressed tendon spacing adjuster. The transverse prestressed tendon positioning frame is provided with several vertical prestressed tendon auxiliary positioning holes. This utility model has a simple structure, is easy to use, has low economic cost, and a wide range of applications. It can accurately position the prestressed reinforcement in the top slab, avoiding interference with the position of the web reinforcement, reducing individual labor intensity, improving production efficiency, and shortening the construction period.

[0004] In the aforementioned prior art, the spacing of the prestressing tendon positioning frames on both sides can be adjusted by rotating the prestressing tendon spacing adjuster, i.e., the turnbuckle, in order to accurately position the prestressing reinforcement of the top slab. However, the prestressing tendon positioning frames are relatively long, requiring multiple turnbuckles to be set between the two prestressing tendon positioning frames for adjustment. When adjusting by rotating the turnbuckles, it is not convenient to check the movement distance of the prestressing tendon positioning frames on both sides, which can easily lead to inconsistent adjustment spacing of the turnbuckles at different positions, causing deviations in the spacing between two adjacent prestressing tendon positioning frames. Therefore, a prestressed box girder top slab shear reinforcement positioning device is needed to meet people's needs. Utility Model Content

[0005] The purpose of this utility model is to provide a positioning device for the shear reinforcement of the top slab of a prestressed box girder, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a positioning device for shear reinforcement in the top slab of a prestressed box girder, comprising two prestressed tendon positioning frames; several arc-shaped positioning plates are movably installed on each of the two prestressed tendon positioning frames, and the same adjustment structure is installed on the two arc-shaped positioning plates located on the same side, with an installation plate and an arc-shaped support rod installed on the adjustment structure, an identification structure installed on the installation plate, and a limit structure installed on the arc-shaped support rod.

[0007] Preferably, the adjustment structure includes a connecting frame, on which two threaded sleeves are installed. Each of the two threaded sleeves has an adjusting screw threaded inside, and the two adjusting screws are respectively installed on two arc-shaped positioning plates.

[0008] Preferably, a limiting screw is installed on the internal thread of the threaded sleeve, and the limiting screw is in contact with the surface of the adjusting screw.

[0009] Preferably, the marking structure includes a scale, which is installed on one side of the mounting plate. The mounting plate is fixedly sleeved on the adjusting screw. A movable plate is rotatably sleeved on the threaded sleeve. The movable plate is slidably installed on the scale. A directional arrow is provided on one side of the movable plate, and the directional arrow corresponds to the scale.

[0010] Preferably, a limiting ring is rotatably installed inside the movable plate, and the limiting ring is fixedly sleeved on the threaded sleeve.

[0011] Preferably, the limiting structure includes a connecting plate, which is installed at one end of the arc-shaped support rod. The arc-shaped support rod is movably installed on one side of the arc-shaped positioning plate. The connecting plate and the arc-shaped positioning plate are threaded together with the same extrusion screw. A rubber abutment is installed at one end of the extrusion screw, and the rubber abutment contacts the outer surface of the prestressed tendon positioning frame.

[0012] Preferably, the arc-shaped support rod has an arc-shaped guide groove inside, and an arc-shaped guide strip is movably installed in the arc-shaped guide groove. The arc-shaped guide strip is installed on one side of the arc-shaped positioning plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) In use, the arc-shaped positioning plates on both sides can be sequentially fitted onto the corresponding prestressed tendon positioning frames. Then, the prestressed tendon positioning frames are wrapped by flipping the arc-shaped support rod to realize the installation of the device. After that, the distance between the prestressed tendon positioning frames on both sides can be adjusted by rotating the connecting frame and the threaded sleeve. The scale position of the ruler pointed to by the arrow can change with the movement of the prestressed tendon positioning frame to judge the distance when the prestressed tendon positioning frame moves. This makes it convenient to adjust the degree of adjustment of each position of the prestressed tendon positioning frame, ensuring that the two ends and the middle of the two adjacent prestressed tendon positioning frames are equal in the time interval during installation, reducing the deviation of the distance between the two prestressed tendon positioning frames, and thus improving the positioning effect of the prestressed tendon positioning frame.

[0015] (2) After flipping the arc-shaped support rod, it can wrap the prestressed tendon positioning frame by cooperating with the arc-shaped positioning plate. At this time, the extrusion screw can be screwed into the arc-shaped positioning plate and the connecting plate to fix the position of the arc-shaped support rod and the arc-shaped positioning plate. At the same time, the rubber block can be driven to press on the surface of the prestressed tendon positioning frame, thereby fixing the position of the arc-shaped support rod and the arc-shaped positioning plate. After adjusting the spacing of the prestressed tendon positioning frame, the limit screw can be screwed into the threaded sleeve and pressed on the surface of the adjusting screw to prevent the threaded sleeve from rotating and loosening on the adjusting screw, thus improving the stability of the device connection. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a prestressed box girder top slab shear reinforcement positioning device proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the arc-shaped positioning plate structure of a prestressed box girder top slab shear reinforcement positioning device proposed in this utility model;

[0018] Figure 3 This is a schematic diagram of the pointing arrow structure of a positioning device for shear reinforcement in the top slab of a prestressed box girder proposed in this utility model;

[0019] Figure 4 This is a cross-sectional view of the arc-shaped positioning plate of the positioning device for the shear reinforcement of the top slab of a prestressed box girder proposed in this utility model.

[0020] Figure 5 This is a schematic cross-sectional view of the threaded sleeve structure of a prestressed box girder top slab shear reinforcement positioning device proposed in this utility model.

[0021] In the diagram: 100, prestressed tendon positioning frame; 200, arc-shaped positioning plate; 201, connecting frame; 202, threaded sleeve; 203, adjusting screw; 204, limiting screw; 300, mounting plate; 301, scale; 302, movable plate; 303, directional arrow; 304, limiting ring; 400, arc-shaped support rod; 401, connecting plate; 402, extrusion screw; 403, rubber abutment; 404, arc-shaped guide groove; 405, arc-shaped guide strip. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5 This utility model provides a technical solution: a positioning device for shear reinforcement of the top slab of a prestressed box girder, comprising two prestressed tendon positioning frames 100; several arc-shaped positioning plates 200 are movably installed on each of the two prestressed tendon positioning frames 100; the same adjustment structure is installed on the two arc-shaped positioning plates 200 located on the same side; the adjustment structure is equipped with an installation plate 300 and an arc-shaped support rod 400; an identification structure is installed on the installation plate 300; and a limiting structure is installed on the arc-shaped support rod 400. In use, the arc-shaped positioning plates 200 at both ends can be respectively sleeved on the corresponding prestressed tendon positioning frames 100, and the position of the arc-shaped positioning plates 200 is fixed by the limiting structure. Then, the spacing between the two prestressed tendon positioning frames 100 is adjusted by the adjustment structure. The movement distance of the prestressed tendon positioning frames 100 can be easily observed by setting the identification structure.

[0024] Furthermore, the adjustment structure includes a connecting frame 201, on which two threaded sleeves 202 are installed. Each of the two threaded sleeves 202 has an adjusting screw 203 threaded inside. The two adjusting screws 203 are respectively installed on two arc-shaped positioning plates 200. After the arc-shaped positioning plates 200 at both ends are fixed, the connecting frame 201 can be rotated to drive the two threaded sleeves 202 to rotate. Since the adjusting screws 203 are restricted by the arc-shaped positioning plates 200, they cannot rotate with the threaded sleeves 202. Therefore, the rotating threaded sleeves 202 can drive the adjusting screws 203 to move horizontally through the threaded engagement with the adjusting screws 203, thereby adjusting the distance between the adjusting screws 203 at both ends and the arc-shaped positioning plates 200.

[0025] Furthermore, a limiting screw 204 is installed on the internal thread of the threaded sleeve 202. The limiting screw 204 contacts the surface of the adjusting screw 203. The rotating limiting screw 204 can move by engaging with the threaded sleeve 202, so that the moving limiting screw 204 presses against the surface of the adjusting screw 203, thus preventing the adjusting screw 203 from becoming loose from the threaded sleeve 202.

[0026] Furthermore, the marking structure includes a scale 301, which is mounted on one side of the mounting plate 300. The mounting plate 300 is fixedly sleeved on the adjusting screw 203. A movable plate 302 is rotatably sleeved on the threaded sleeve 202. The movable plate 302 is slidably mounted on the scale 301. A directional arrow 303 is provided on one side of the movable plate 302, which corresponds to the scale 301. When the adjusting screw 203 moves, it can drive the mounting plate 300 to move, so that the mounting plate 300 drives the scale 301 to slide inside the movable plate 302. At the same time, the position of the directional arrow 303 pointing to the scale 301 changes. The moving distance of the adjusting screw 203 can be judged by the change of the value at the position of the directional arrow 303 pointing to the scale 301.

[0027] Furthermore, a limiting ring 304 is rotatably installed inside the movable plate 302. The limiting ring 304 is fixedly sleeved on the threaded sleeve 202. When the threaded sleeve 202 rotates, it can drive the limiting ring 304 to rotate inside the movable plate 302, so that the movable plate 302 will not be affected by the rotation of the threaded sleeve 202.

[0028] Furthermore, the limiting structure includes a connecting plate 401, which is installed at one end of the arc-shaped support rod 400. The arc-shaped support rod 400 is movably installed on one side of the arc-shaped positioning plate 200. The connecting plate 401 and the arc-shaped positioning plate 200 are threaded together with the same extrusion screw 402. One end of the extrusion screw 402 is fitted with a rubber stop 403, which contacts the outer surface of the prestressed tendon positioning frame 100. This pushes the connecting plate 401 to move the arc-shaped support rod 400. The sliding arc-shaped support rod 400 can wrap around the prestressed tendon positioning frame 100 by cooperating with the arc-shaped positioning plate 200. At this time, the extrusion screw 402 is screwed into the arc-shaped positioning plate 200 and the connecting plate 401 to fix the position of the arc-shaped support rod 400 and the arc-shaped positioning plate 200.

[0029] Furthermore, the arc-shaped support rod 400 has an arc-shaped guide groove 404 inside, and an arc-shaped guide strip 405 is movably installed in the arc-shaped guide groove 404. The arc-shaped guide strip 405 is installed on one side of the arc-shaped positioning plate 200. The sliding arc-shaped support rod 400 can slide on the arc-shaped guide strip 405 through the arc-shaped guide groove 404, thereby restricting the movement direction of the arc-shaped support rod 400.

[0030] The working principle is as follows: First, unscrew the two end-to-end compression screws 402 from the arc-shaped positioning plate 200 and connecting plate 401. Then, push the connecting plate 401 to slide the arc-shaped support rod 400, opening the arc-shaped positioning plate 200. Then, the arc-shaped positioning plates 200 at both ends can be respectively fitted onto the two prestressed tendon positioning frames 100. Then, push the connecting plate 401 in the opposite direction to drive the arc-shaped support rod 400 to slide and reset. The sliding arc-shaped support rod 400 can slide on the arc-shaped guide strip 405 through the arc-shaped guide groove 404, thus restricting the movement direction of the arc-shaped support rod 400. The continuously sliding arc-shaped support rod 400, through cooperation with the arc-shaped positioning plate 200, can... The prestressing tendon positioning frame 100 is used to enclose the prestressing tendon. Then, the extrusion screw 402 is screwed back into the arc-shaped positioning plate 200 and the connecting plate 401 to fix the position of the arc-shaped support rod 400 and the arc-shaped positioning plate 200, preventing them from loosening from the prestressing tendon positioning frame 100. Furthermore, when the extrusion screw 402 is screwed in, it presses against the prestressing tendon positioning frame 100, thus limiting the position of the arc-shaped positioning plate 200 and the arc-shaped support rod 400 on the prestressing tendon positioning frame 100 and preventing them from shifting. After fixing the arc-shaped positioning plates 200 at both ends, the connecting frame 201 can be rotated to rotate the two threaded sleeves 202. Because the adjusting screw 203 is restricted by the arc-shaped positioning plate 200, it cannot rotate with the threaded sleeve 202. Therefore, the rotating threaded sleeve 202 can drive the adjusting screw 203 to move horizontally through the threaded engagement with the adjusting screw 203, thereby adjusting the distance between the adjusting screws 203 at both ends and the arc-shaped positioning plate 200. This allows for the adjustment of the distance between the prestressed tendon positioning frames 100 on both sides. After adjustment, the limiting screw 204 is rotated. When the limiting screw 204 rotates, it can move through the threaded engagement with the threaded sleeve 202, causing the moving limiting screw 204 to press against the surface of the adjusting screw 203, preventing the adjusting screw 203 from contacting the threaded sleeve 202. When the threaded sleeve 202 comes loose, the rotation of the threaded sleeve 202 causes the limiting ring 304 to rotate inside the movable plate 302, preventing the movable plate 302 from being affected by the rotation of the threaded sleeve 202. When the adjusting screw 203 moves, it causes the mounting plate 300 to move, causing the mounting plate 300 to slide the scale 301 inside the movable plate 302. At the same time, the position of the pointing arrow 303 pointing to the scale 301 changes. The movement distance of the adjusting screw 203 can be judged by the change of the value at the position of the pointing arrow 303 pointing to the scale 301, thus facilitating the adjustment of the movement distance of the adjusting screw 203 in different positions to be consistent.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prestressed box girder top slab shear reinforcement positioning device, comprising two prestressed reinforcement positioning frames (100); characterized in that: Several arc-shaped positioning plates (200) are movably installed on both of the prestressed tendon positioning frames (100). The same adjustment structure is installed on the two arc-shaped positioning plates (200) located on the same side. An installation plate (300) and an arc-shaped support rod (400) are installed on the adjustment structure. An identification structure is installed on the installation plate (300), and a limit structure is installed on the arc-shaped support rod (400).

2. The prestressed box girder top slab shear reinforcement positioning device according to claim 1, characterized in that: The adjustment structure includes a connecting frame (201), on which two threaded sleeves (202) are installed. An adjusting screw (203) is threaded inside each of the two threaded sleeves (202), and the two adjusting screws (203) are respectively installed on two arc-shaped positioning plates (200).

3. The prestressed box girder top slab shear reinforcement positioning device according to claim 2, characterized in that: The threaded sleeve (202) has a limiting screw (204) installed on its internal thread, and the limiting screw (204) is in contact with the surface of the adjusting screw (203).

4. The prestressed box girder top slab shear reinforcement positioning device according to claim 1, characterized in that: The marking structure includes a scale (301), which is mounted on one side of a mounting plate (300). The mounting plate (300) is fixedly sleeved on an adjusting screw (203). A movable plate (302) is rotatably sleeved on a threaded sleeve (202). The movable plate (302) is slidably mounted on the scale (301). A directional arrow (303) is provided on one side of the movable plate (302), and the directional arrow (303) corresponds to the scale (301).

5. A prestressed box girder top slab shear reinforcement positioning device according to claim 4, characterized in that: A limiting ring (304) is rotatably installed inside the movable plate (302), and the limiting ring (304) is fixedly sleeved on the threaded sleeve (202).

6. A prestressed box girder top slab shear reinforcement positioning device according to claim 1, characterized in that: The limiting structure includes a connecting plate (401), which is installed at one end of an arc-shaped support rod (400). The arc-shaped support rod (400) is movably installed on one side of an arc-shaped positioning plate (200). The connecting plate (401) and the arc-shaped positioning plate (200) are threaded together with the same extrusion screw (402). A rubber stop (403) is installed at one end of the extrusion screw (402), and the rubber stop (403) contacts the outer surface of the prestressed tendon positioning frame (100).

7. A prestressed box girder top slab shear reinforcement positioning device according to claim 1, characterized in that: The arc-shaped support rod (400) has an arc-shaped guide groove (404) inside, and an arc-shaped guide strip (405) is movably installed in the arc-shaped guide groove (404). The arc-shaped guide strip (405) is installed on one side of the arc-shaped positioning plate (200).

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