Steel box girder external prestressing steering block device

Abstract

The utility model provides an external prestressing steering block device for a steel box girder. The external prestressing steering block device comprises an upper top plate, a U-shaped plate, an arc-shaped steering plate and a steel bar limiting pipe, the opening end of the U-shaped plate is connected with an upper top plate; an arc-shaped steering plate is fixed below the upper top plate, a steel bar limiting pipe is fixed to the outer side of the arc-shaped steering plate, and a steel bar channel is formed between the arc-shaped steering plate and the U-shaped plate. Compared with the prior art, the steering block is higher in stability and rigidity, prefabricated in a factory and simple in construction, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of external prestressing, and particularly relates to an external prestressing turning block device for a steel box girder. Background Art

[0002] The external prestressing technology is a reinforcement technology widely used in bridge engineering. Its basic principle is to use external prestressing materials such as high-strength steel strands and steel wires to reinforce the structure. These prestressing materials are fixed at specific parts of the structure, and by applying prestress, reverse stress is generated in the structure, thereby improving the bearing capacity of the structure.

[0003] The significant advantage of the external prestressing technology is that the prestressing tendons are arranged outside the concrete section. Compared with the traditional method of arranging prestressing tendons inside the section, it is easy to inspect, convenient to replace, and convenient for construction. The external prestressing technology is particularly suitable for bridge engineering, and it can effectively improve the mechanical properties of the structure, increase the ultimate bearing capacity and stiffness of the structure, and reduce deformation and cracks.

[0004] The external prestressing turning block plays a very crucial role in the external prestressing structure of a bridge. The turning block can effectively transfer the acting force of the external prestressing tendon, ensuring that the prestressing tendon generates the expected prestressing effect in the bridge structure. The turning block can limit its free length, prevent the external cable from generating excessive vibration in the bridge structure, thereby ensuring the stability and safety of the structure.

[0005] The existing designs of external prestressing turning blocks mostly target high-strength concrete bridges, and there are few studies on the external prestressing turning blocks for steel box girders. The structural stress characteristics of the turning block are relatively complex, prone to stress concentration, and the existing turning block construction is cumbersome and the construction efficiency is low.

[0006] Therefore, designing an external prestressing turning block device for a steel box girder with simple stress and convenient construction is of great significance for improving construction efficiency and increasing structural safety. Content of the Utility Model

[0007] In order to solve the problems existing in the above-mentioned prior art, an external prestressing turning block device for a steel box girder is designed.

[0008] The technical solution for the utility model to solve the technical problem is as follows: The utility model provides an external prestressing turning block device for a steel box girder, which includes an upper top plate, a U-shaped plate, an arc-shaped turning plate, and a steel bar limiting tube; the open end of the U-shaped plate is connected with the upper top plate; an arc-shaped turning plate is fixed below the upper top plate, and a steel bar limiting tube is fixed outside the arc-shaped turning plate.

[0009] Preferably, a plurality of stiffening rib plates perpendicular to the tangent direction of the turning plate are further arranged between the upper top plate and the arc-shaped turning plate.

[0010] Preferably, the reinforcing bar limiting tube is provided with wide openings with edges flaring outwards in a trumpet shape at the positions of its two ends.

[0011] Preferably, a longitudinal stiffening rib plate is further arranged on one side of the U-shaped plate; the longitudinal stiffening rib plate is vertically fixed between the top plate and the bottom plate of the steel box girder.

[0012] Preferably, vertical bolt holes and transverse bolt holes are formed in the side plates of the U-shaped plate.

[0013] Preferably, a plurality of bolts are connected to both sides and the bottom surface of the turning block, and the bolts connect the turning block U-shaped plate to the web of the steel box girder and the longitudinal stiffening rib plate.

[0014] Preferably, a 2-mm-thick polytetrafluoroethylene plate is pasted on the inner wall of the reinforcing bar limiting tube and the lower surface of the arc-shaped turning plate with resin glue.

[0015] Preferably, all components and bolts need to be subjected to rust prevention treatment.

[0016] Compared with the prior art, the above technical solution has the following advantages or beneficial effects: Through the external prestressed turning block, the present utility model effectively transmits the acting force of the external prestressed tendon, ensures the expected prestress effect generated by the prestressed tendon in the steel box girder, simplifies the structure of the turning block, improves the construction efficiency and increases the structural safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic cross-sectional view of an embodiment of the present utility model;

[0019] Figure 2 It is a side view of an embodiment of the present utility model;

[0020] Figure 3 It is a top view of an embodiment of the present utility model;

[0021] Figure 4 It is a three-dimensional schematic diagram of an embodiment of the present utility model;

[0022] Figure 5 It is a schematic diagram of the position of the turning block in the steel box girder;

[0023] Description of the reference numerals:

[0024] 1 - Upper top plate, 2 - Stiffening rib plate, 3 - Arc-shaped steering plate, 4 - Steel bar limiting tube, 5 - Vertical bolt hole, 6 - U-shaped plate, 7 - Flared opening of steel bar limiting tube, 8 - Transverse bolt hole, 9 - Longitudinal stiffening rib plate, 10 - Web of box girder, 11 - Bottom plate of box girder, 12 - Top plate of box girder, 13 - Prestressed tendon bundle. Detailed implementation mode

[0025] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, but should not be construed as a limitation to the present invention.

[0026] As Figures 1 - 5 shown, the present application provides a device for external prestressed steering block of steel box girder, including an upper top plate 1, a U-shaped plate 6, an arc-shaped steering plate 3, and a steel bar limiting tube 4; the open end of the U-shaped plate 6 is connected to the upper top plate 1; an arc-shaped steering plate 3 is fixed below the upper top plate 1, and a steel bar limiting tube 4 is fixed outside the arc-shaped steering plate 3.

[0027] As Figure 1 shown, the three stiffening rib plates 2, the stiffening rib plates 2 are welded between the steering block top plate 1 and the steering plate 3, and the welding direction of the stiffening rib plates 2 is perpendicular to the tangent direction of the steering plate 3, which can ensure that the steering block is stressed more directly and improve the overall stiffness of the steering block, effectively ensuring the structural stability.

[0028] As Figure 5 shown, it also includes a longitudinal stiffening rib plate 9 inside the steel box girder for fixing one side of the steering block. The longitudinal stiffening rib plate 9 is vertically fixedly connected to the top plate 12 and the bottom plate 11 of the steel box girder respectively, and the longitudinal length can be determined according to specific circumstances and should not be less than the length of the steering block.

[0029] As Figure 1 shown, in this embodiment, the steel bar limiting tube 4 is provided with flared openings 7 with edges flared outwards at the positions of both ends of its pipe orifices, which is convenient for the prestressed tendons to penetrate. When in use, the steel bar limiting tube 4 can prevent the prestressed tendon bundle from shifting and slipping.

[0030] As Figure 4 Figure 5 shown, the side plates of the U-shaped plate 6 are provided with vertical bolt holes 5 and transverse bolt holes 8; when the steering block is connected and installed, holes are drilled at the corresponding positions of the web 10 of the steel box girder and the longitudinal stiffening rib plate 9 according to the bolt holes on the side of the U-shaped plate 6, and the U-shaped plate 6 of the steering block is connected to the web 10 of the steel box girder and the longitudinal stiffening rib plate 9 through bolts.

[0031] When tightening the bolt connection, ensure that the connection part is clean without rust and oil stains. Do not overtighten, as overtightening may cause the bolt and the connecting piece to bear excessive loads, resulting in damage to the component and affecting the safety of the component.

[0032] As Figure 1 shown, a 2-mm thick polytetrafluoroethylene plate is pasted on the inner wall of the steel bar limiting tube 4 and the lower surface of the steering plate 3 using resin glue.

[0033] The thick polytetrafluoroethylene plate can reduce the friction between the prestressed tendon 13 and the steering plate 3 and reduce the prestress loss.

[0034] All components and bolts of the device need to be rust-proofed to ensure their durability. Now, clean the oil stains, rust, and debris on the surface of the steel components, and then use shot blasting or peening for rust removal treatment.

[0035] The working process of the present utility model is as follows:

[0036] First, weld the upper top plate 1 of the steering block, the arc-shaped steering plate 3, the transverse stiffening rib plate 2, and the steel bar limiting tube 4 into a whole in the steel structure processing factory. During welding, the quality needs to meet the requirements, and at the same time, the coating protection of the outer surface of the structure should be done well. After transporting to the construction site, fix the steering block on the box girder web 10 with bolts, and install the longitudinal stiffening rib plate 9 on the other side. After completion, pass the steel strand into the steel bar limiting tube 4, ensure that the steel strand is not damaged, and then tension the prestressed steel strand to complete the application of the external prestress.

[0037] Although the specific implementation manners of the utility model are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present utility model. Based on the technical solution of the present utility model, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present utility model.

Claims

1. An external prestressed deflection block device for a steel box girder, which is arranged inside the steel box girder, is characterized in that It includes an upper top plate (1), a U-shaped plate (6), an arc-shaped steering plate (3) and a steel bar limiting tube (4); the open end of the U-shaped plate (6) is connected to the upper top plate (1); an arc-shaped steering plate (3) is fixed below the upper top plate (1), a steel bar limiting tube (4) is fixed on the outer side of the arc-shaped steering plate (3), and a steel bar channel is formed between the arc-shaped steering plate (3) and the U-shaped plate (6).

2. The external prestressed deviator device for a steel box girder according to claim 1, characterized in that, A plurality of stiffening rib plates (2) perpendicular to the tangent direction of the arc-shaped steering plate (3) are further arranged between the upper top plate (1) and the arc-shaped steering plate (3).

3. The external prestressed deflection block device for a steel box girder according to claim 1, characterized in that, The steel bar limiting tube (4) is arc-shaped, and wide openings (7) with edges flaring outwards in a trumpet shape are arranged at the positions of the two ends of its pipe orifice.

4. The external prestressed deflection block device for a steel box girder according to claim 1 or 3, characterized in that, A longitudinal stiffening rib plate (9) is further arranged on one side of the U-shaped plate (6); the longitudinal stiffening rib plate (9) is vertically fixed between the top plate (12) and the bottom plate (11) of the steel box girder.

5. The external prestressed deflection block device for a steel box girder according to claim 1, characterized in that, Vertical bolt holes (5) and transverse bolt holes (8) are formed in the side plate of the U-shaped plate (6).

6. The external prestressed turning block device for a steel box girder according to claim 1, characterized in that, A plurality of bolts are connected to both sides and the bottom surface of the U-shaped plate (6), and the bolts connect the U-shaped plate (6) to the web (10) of the steel box girder and the longitudinal stiffening rib plate (9).

7. The external prestressed deflection block device for a steel box girder according to claim 3, characterized in that Polytetrafluoroethylene plates are pasted on the inner wall of the steel bar limiting tube (4) and the lower surface of the arc-shaped steering plate (3) with resin glue.

8. The external prestressed deflection block device for a steel box girder according to claim 5, characterized in that, All components and bolts need to be treated against rust.

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