Bending bearing beam capable of improving bearing capacity

Abstract

The utility model relates to a flexural bearing beam capable of improving bearing capacity, which is characterized in that fixed lug plates are respectively and fixedly welded on two sides of the lower surface of a bearing rail box beam, the two fixed lug plates are respectively connected with pre-tightening connecting pieces, and two ends of a closed steel rope are respectively connected with the corresponding pre-tightening connecting pieces. According to the bearing beam, the elastic strength amplitude of steel can be fully utilized by reasonably applying the prestress inhaul cables or stranded wires, so that the bearing capacity of the structure is improved, the stress state of the structure is improved, and the steel is saved.

Description

Technical Field

[0001] The utility model relates to a bending load-bearing beam with improved load-bearing capacity, belonging to the technical field of steel structure beams. Background Art

[0002] As an important load-bearing member, the bending-bearing steel structural beam is mainly used to bear bending moment and shear force, while ignoring axial force. This force characteristic makes the bending member bear an important load role in various load-bearing structures, especially in structures that require bending deformation. For example, beams and plates are typical bending members. They undertake the important task of transferring and distributing loads in applications. Their force characteristics are compression on the upper part and tension on the lower part. For large spans and large loads, stiffness is the first assessment indicator. The usual way to improve the stiffness of the load-bearing beam is to increase the width, height or thickness of the web of the beam, thereby increasing the bending section modulus of the beam, thereby achieving the purpose of increasing strength and stiffness. However, these methods are not applicable to occasions with spatial height requirements, and are not the best solutions in terms of material saving. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a bending load-bearing beam with improved bearing capacity. The load-bearing beam can fully utilize the elastic strength amplitude of steel by reasonably applying prestressed cables or strands, thereby improving the bearing capacity of the structure, which not only improves the stress state of the structure but also saves the use of steel.

[0004] In order to solve the above problems, the specific technical solution of the utility model is as follows: a bending load-bearing beam with improved bearing capacity, fixed ear plates are respectively fixed and welded on both sides of the lower surface of the rail-bearing box beam, the two fixed ear plates are respectively connected to pre-tightening connectors, and the two ends of the closed steel cable are respectively connected to the corresponding pre-tightening connectors.

[0005] The fixed ear plate is composed of a transverse plate, a longitudinal plate and an oblique rib, wherein the transverse plate is welded and fixed to the bottom surface of the rail-supporting box beam, and the longitudinal plate is flush with the end surface of the rail-supporting box beam in the length direction; the three oblique ribs are equidistantly arranged in parallel along the width direction of the rail-supporting box beam, and the horizontal and vertical surfaces of the oblique ribs are respectively fixed and welded to the corresponding transverse plate and longitudinal plate.

[0006] Two parallel pre-tightening connectors are provided between every two diagonal ribs.

[0007] The pre-tightening connector includes a pre-tightening screw, a pre-tightening nut and a transition connecting rod. One end of the transition connecting rod is a double-ear structure and is connected to a closed steel cable through a pin shaft; the other end of the transition connecting rod is provided with an internal thread, which is threadedly connected to one end of the pre-tightening screw, and the other end of the pre-tightening screw is threadedly connected to the pre-tightening nut after passing through the longitudinal plate.

[0008] The bending-bearing beam with improved bearing capacity of the present application realizes the solution of adding pre-tensioned cables in the steel structure beam. The small-section steel beam is used to meet the requirements of strength, stiffness and stability under the action of the reverse bending moment generated by the pre-tension, while greatly saving the use of steel, reducing costs and effectively improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Front view of a flexurally loaded beam designed to increase load-bearing capacity.

[0010] Figure 2 Side view of a flexurally loaded beam designed to increase load-bearing capacity.

[0011] Figure 3 for Figure 2 Cross-sectional view at AA.

[0012] Figure 4 for Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0013] like Figure 1 and Figure 2 As shown, a bending load-bearing beam with improved load-bearing capacity has fixed ear plates 4 welded on both sides of the lower surface of the rail-supporting box beam 1, and pre-tightening connectors 3 are respectively connected to the two fixed ear plates 4, and the two ends of the closed steel cable 2 are respectively connected to the corresponding pre-tightening connectors 3.

[0014] like Figure 3 As shown, the fixed lug plate 4 is composed of a transverse plate 4-1, a longitudinal plate 4-2, and diagonal ribs 4-3. The transverse plate 4-1 is welded to the bottom surface of the rail support box beam 1, and the longitudinal plate 4-2 is flush with the longitudinal end surface of the rail support box beam 1. Three diagonal ribs 4-3 are equidistantly arranged parallel to the width of the rail support box beam 1, and the horizontal and vertical surfaces of the diagonal ribs 4-3 are respectively welded to the corresponding transverse plate 4-1 and longitudinal plate 4-2. Two parallel pre-tightening connectors 3 are provided between each pair of diagonal ribs 4-3.

[0015] like Figure 4 As shown, the pre-tightening connector 3 includes a pre-tightening screw 3-1, a pre-tightening nut 3-2 and a transition connecting rod 3-3. One end of the transition connecting rod 3-3 is a double-ear structure and is connected to the closed steel cable 2 through a pin shaft; the other end of the transition connecting rod 3-3 is provided with an internal thread, which is threadedly connected to one end of the pre-tightening screw 3-1, and the other end of the pre-tightening screw 3-1 is threadedly connected to the pre-tightening nut 3-2 after passing through the longitudinal plate 4-2.

[0016] Steel structural bending beams are prestressed with steel cables or strands. High-strength strands or cables with high pretension are installed on the tension side of the beam. The pretension parameters are calculated and selected based on the load on the beam. This pretension forces the beam to experience a negative bending moment before the load is applied, thereby offsetting the positive bending moment generated by the load at mid-span. Prestressing can also convert some of this bending moment into axial force, reducing the cross-section of the beam and significantly reducing steel consumption. Furthermore, prestressing improves the rigidity and stability of the structure. This structure also offers other advantages, such as increased rigidity and durability, as well as reduced vertical shear and principal tensile stresses, thereby improving overall structural stability. These advantages are particularly significant in structures with long spans and heavy loads. Therefore, by adding pre-tensioned steel cables or strands on the bending side away from the centroid of the cross-section, prestressing is applied to the steel structure beam to produce a reverse bending moment. This not only improves the bearing capacity and stability of the structure, but also improves the mechanical properties of the structure, thus solving the shortcomings of ordinary steel beams in bearing capacity and stability, and can effectively control the deformation of the entire structure.

Claims

1. A bending load-bearing beam with improved load-bearing capacity, characterized in that: Fixed ear plates (4) are respectively welded to both sides of the lower surface of the rail-supporting box beam (1), and pre-tightening connectors (3) are respectively connected to the two fixed ear plates (4). Both ends of the closed steel cable (2) are respectively connected to the corresponding pre-tightening connectors (3).

2. The bending load-bearing beam with improved load-bearing capacity according to claim 1, characterized in that: The fixed ear plate (4) is composed of a transverse plate (4-1), a longitudinal plate (4-2) and an oblique reinforcement (4-3), wherein the transverse plate (4-1) is welded and fixed to the bottom surface of the rail-supporting box beam (1), and the longitudinal plate (4-2) is flush with the end surface of the rail-supporting box beam (1) in the length direction; three oblique reinforcements (4-3) are arranged equidistantly and parallelly along the width direction of the rail-supporting box beam (1), and the horizontal surface and vertical surface of the oblique reinforcement (4-3) are respectively fixed and welded to the corresponding transverse plate (4-1) and longitudinal plate (4-2).

3. The bending load-bearing beam with improved load-bearing capacity according to claim 2, characterized in that: Two parallel pre-tightening connectors (3) are provided between every two oblique ribs (4-3).

4. The bending load-bearing beam with improved load-bearing capacity according to claim 3, characterized in that: The pre-tightening connector (3) comprises a pre-tightening screw (3-1), a pre-tightening nut (3-2) and a transition connecting rod (3-3). One end of the transition connecting rod (3-3) is a double-ear structure and is connected to the closed steel cable (2) via a pin shaft. The other end of the transition connecting rod (3-3) is provided with an internal thread, which is threadedly connected to one end of the pre-tightening screw (3-1). The other end of the pre-tightening screw (3-1) passes through the longitudinal plate (4-2) and is threadedly connected to the pre-tightening nut (3-2).

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