Large-span concrete box girder bridge prestress loading structure

Abstract

The utility model belongs to the technical field of concrete box girder bridge pre-stress loading protection, particularly relates to a large-span concrete box girder bridge pre-stress loading structure, and aims to solve the technical problems that steel beams are arranged in a concrete box girder bridge in the prior art, the single steel beam is easy to be stressed and deviated when pulled, the stability is poor, and the construction cost is low. In order to solve the problem that the operation of arranging a steel beam in a concrete box girder bridge is inconvenient, the following scheme is provided, the concrete box girder bridge comprises a bridge panel and a concrete box girder body, the concrete box girder body is fixedly arranged at the bottom of the bridge panel, and a plurality of prestress loading mechanisms are symmetrically arranged on the two sides of the bridge panel and the two sides of the concrete box girder body; the device is used for assisting in straightening the concrete box girder body. According to the utility model, the plurality of prestress loading mechanisms are symmetrically arranged on the two sides of the bridge panel and the concrete box girder body, so that the stress on the two sides is balanced, and the prestress loading mechanisms are arranged on the outer side of the concrete box girder body, so that the installation and the operation can be conveniently carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of prestressed loading protection of concrete box girder bridges, in particular to a prestressed loading structure of a large-span concrete box girder bridge. Background Art

[0002] Concrete box girder is a type of beam in bridge engineering. The structural material of box girder bridge is usually high-strength reinforced concrete. It is hollow inside and has flanges on both sides of the upper part. It is named after its box-like shape. The box girder of reinforced concrete structure is divided into prefabricated box girder and cast-in-place box girder. The box girder prefabricated in an independent site can be erected after the lower project is completed in combination with a bridge-building machine, which can speed up the project progress and save construction time. Cast-in-place box girder is mostly used in large continuous bridges. Currently, there are two main types of materials, one is prestressed reinforced concrete box girder and the other is steel box girder. Among them, prestressed reinforced concrete box girder is constructed on-site. In addition to longitudinal prestressing, some also have transverse prestressing. The transverse prestressed structure of traditional concrete box girder is a steel bar structure. When the load on both sides of the concrete box girder is heavier, the force is concentrated at the intersection of the beam and the support, and the load-bearing is large, which seriously limits the span design of the concrete box girder. For this reason, the present invention provides a large-span concrete box girder transverse prestressed structure to solve the above problems.

[0003] Publication (announcement) number: CN220468608U relates to a large-span concrete box girder transverse bridge prestressed structure, comprising a concrete box girder body, a long prestressed steel bundle, a bite sleeve, a spinning sleeve, a short prestressed steel bundle and hooks fixed at both ends of the short prestressed steel bundle, the concrete box girder body comprising a support and a crossbeam connected between the two ends of the support, a plurality of connecting holes are arranged between the two sides of the crossbeam, a curved groove is arranged on the lower side of the middle part of the connecting hole, wherein the long prestressed steel bundle is arranged through the connecting hole, the two ends of the long prestressed steel bundle are fastened by the bite sleeve and the spinning sleeve, the middle part of the long prestressed steel bundle is connected to the hook at the top end of the short prestressed steel bundle, the long prestressed steel bundle is passed through the connecting hole, and the hooks at both ends of the short prestressed steel bundle are respectively connected to the long prestressed steel bundle and the hanging ring, after the long prestressed steel bundle is tightened, the spinning sleeve can be screwed to squeeze the inclined plate to clamp the two ends of the long prestressed steel bundle.

[0004] The existing technology uses a technique of setting steel bundles inside a concrete box girder bridge. A single steel bundle is easily pulled and subjected to force deviation, resulting in poor stability. Setting the steel bundle inside a concrete box girder bridge is inconvenient. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art that the technology used is to set steel bundles inside the concrete box girder bridge, the single steel bundle is easily pulled and the force deviation is poor, the stability is poor, and the operation of setting the steel bundles inside the concrete box girder bridge is inconvenient, and a prestressed loading structure for a large-span concrete box girder bridge is proposed.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A prestressed loading structure for a large-span concrete box girder bridge comprises a bridge deck and a concrete box girder body. The concrete box girder body is fixedly arranged at the bottom of the bridge deck. A plurality of prestressed loading mechanisms are symmetrically arranged on both sides of the bridge deck and the concrete box girder body to assist in straightening the concrete box girder body.

[0008] Preferably, the prestressed loading mechanism includes a screw rod and a hanging ring, a hook is fixedly installed on the bottom end of the screw rod, the hanging ring is welded to the outside of the concrete box beam body, and the hook cooperates with the hanging ring.

[0009] Preferably, a rectangular frame is movably installed on the outer side of the screw rod, a mounting hole is opened on the rectangular frame, and two nuts are threadedly connected to the screw rod. The two nuts are located on both sides of the bottom edge of the rectangular frame and are used to fix the screw rod and the rectangular frame. The position of the screw rod and the rectangular frame can be adjusted.

[0010] Preferably, the prestressed loading mechanism also includes two semicircular plates, each of which is provided with a mounting hole, a connecting plate is fixedly installed on the top of the rectangular frame, an axle pin is provided between the two semicircular plates and the connecting plate, a through hole is provided on the connecting plate, and the axle pin is installed on the two mounting holes and the through hole for connecting the two semicircular plates to the connecting plate.

[0011] Compared with the prior art, the advantages of the present invention are:

[0012] This solution sets up multiple prestressed loading mechanisms on both sides of the bridge deck and the concrete box girder body according to the use requirements. The tightness of the screw rod is adjusted by the cooperation of two nuts. The prestressed loading mechanism pulls the concrete box girder body upward to prevent the concrete box girder body from bending under its own weight.

[0013] The utility model symmetrically arranges multiple prestressed loading mechanisms on both sides of the bridge panel and the concrete box beam body, so that the forces on both sides are balanced. The prestressed loading mechanisms are arranged outside the concrete box beam body, which can be easily installed and operated. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a prestressed loading structure of a large-span concrete box girder bridge proposed in the present utility model;

[0015] Figure 2 This is a front view structural diagram of a prestressed loading structure of a large-span concrete box girder bridge proposed in the present invention;

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the rectangular frame and connecting plate proposed in the present invention;

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the screw rod, two nuts, hook and hanging ring proposed in the utility model;

[0018] Figure 5 This is a schematic diagram of the three-dimensional structure of two semicircular plates proposed in the present invention;

[0019] Figure 6 This is a schematic diagram of the three-dimensional structure of the axle pin proposed in the utility model.

[0020] In the figure: 1. Bridge panel; 2. Concrete box girder body; 3. Prestressed loading mechanism; 31. Rectangular frame; 311. Mounting hole; 32. Connecting plate; 321. Through hole; 33. Semicircular plate; 331. Mounting hole; 34. Screw rod; 35. Nut; 36. Hook; 37. Hanging ring; 38. Axle pin. DETAILED DESCRIPTION

[0021] The technical solution of this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of this embodiment, rather than all the embodiments.

[0022] Example

[0023] Reference Figure 1-2 A prestressed loading structure of a large-span concrete box girder bridge includes a bridge deck 1 and a concrete box girder body 2. The concrete box girder body 2 is fixedly arranged at the bottom of the bridge deck 1. Multiple prestressed loading mechanisms 3 are symmetrically arranged on both sides of the bridge deck 1 and the concrete box girder body 2 to assist in straightening the concrete box girder body 2.

[0024] Reference Figure 4 In this embodiment, the prestressed loading mechanism 3 includes a screw rod 34 and a hanging ring 37. A hook 36 is fixedly installed at the bottom end of the screw rod 34. The hanging ring 37 is welded to the outside of the concrete box beam body 2, and the hook 36 cooperates with the hanging ring 37.

[0025] Reference Figure 3 、 Figure 4 In this embodiment, a rectangular frame 31 is movably installed on the outer side of the screw rod 34, and a mounting hole 311 is opened on the rectangular frame 31. Two nuts 35 are threadedly connected to the screw rod 34. The two nuts 35 are located on both sides of the bottom edge of the rectangular frame 31 and are used to fix the screw rod 34 and the rectangular frame 31. The position of the screw rod 34 and the rectangular frame 31 can be adjusted.

[0026] Reference Figure 5 、 Figure 6 In this embodiment, the prestressed loading mechanism 3 also includes two semicircular plates 33, each of which is provided with a mounting hole 331. A connecting plate 32 is fixedly installed on the top of the rectangular frame 31. An axle pin 38 is provided between the two semicircular plates 33 and the connecting plate 32. A through hole 321 is provided on the connecting plate 32. The axle pin 38 is installed on the two mounting holes 331 and the through hole 321 for connecting the two semicircular plates 33 with the connecting plate 32.

[0027] Working method: When in use, multiple prestressed loading mechanisms 3 are set on both sides of the bridge panel 1 and the concrete box girder body 2 according to the use requirements. The distance between two adjacent prestressed loading mechanisms 3 is 10-20m, and a hanging ring 37 is welded on the concrete box girder body 2. Two semicircular plates 33 are welded at the bottom of the bridge panel 1. The connecting plate 32 is installed between the two semicircular plates 33 through the axle pin 38, and the hook 36 is connected to the hanging ring 37. The lower nut 35 of the two nuts 35 is loosened, and the upper nut 35 of the two nuts 35 is tightened. The concrete box girder body 2 is pulled upward by the pulling of the prestressed loading mechanism 3 to prevent the concrete box girder body 2 from bending under its own weight. Similarly, the remaining prestressed loading mechanisms 3 can be installed. All structures in this application can be selected in terms of material and length according to actual usage. The accompanying drawings are all schematic structural diagrams, and the specific actual dimensions can be appropriately adjusted.

[0028] The above is only a preferred specific implementation method of this embodiment, but the protection scope of this embodiment is not limited to this. Any technician familiar with this technical field can make equivalent replacements or changes based on the technical solution and utility model concept of this embodiment within the technical scope disclosed in this embodiment, and they should be covered by the protection scope of this embodiment.

Claims

1. A prestressed loading structure of a large-span concrete box girder bridge, comprising a bridge deck (1) and a concrete box girder body (2), wherein the concrete box girder body (2) is fixedly arranged at the bottom of the bridge deck (1), and is characterized in that: A plurality of prestressed loading mechanisms (3) are symmetrically provided on both sides of the bridge panel (1) and the concrete box beam body (2), for assisting in straightening the concrete box beam body (2); The prestressed loading mechanism (3) comprises a screw rod (34) and a hanging ring (37). A hook (36) is fixedly mounted on the bottom end of the screw rod (34). The hanging ring (37) is welded to the outside of the concrete box beam body (2). The hook (36) cooperates with the hanging ring (37).

2. The prestressed loading structure of a long-span concrete box girder bridge according to claim 1, characterized in that: A rectangular frame (31) is movably mounted on the outer side of the screw rod (34), and a mounting hole (311) is provided on the rectangular frame (31). Two nuts (35) are threadedly connected to the screw rod (34), and the two nuts (35) are located on both sides of the bottom edge of the rectangular frame (31) and are used to fix the screw rod (34) and the rectangular frame (31). The positions of the screw rod (34) and the rectangular frame (31) can be adjusted.

3. The prestressed loading structure of a long-span concrete box girder bridge according to claim 2, characterized in that: The prestressed loading mechanism (3) further comprises two semicircular plates (33), each of the two semicircular plates (33) being provided with a mounting hole (331), a connecting plate (32) being fixedly mounted on the top of the rectangular frame (31), and an axle pin (38) being provided between the two semicircular plates (33) and the connecting plate (32).

4. The prestressed loading structure of a long-span concrete box girder bridge according to claim 3, characterized in that: A through hole (321) is provided on the connecting plate (32), and the shaft pin (38) is installed on the two mounting holes (331) and the through hole (321) to connect the two semicircular plates (33) and the connecting plate (32).

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