Three-point adjustable steel truss T-beam cross beam

Abstract

A three-point adjustable steel truss type T-beam diaphragm includes two bottom left and right flange nodes and two parallel node plates. The bottom two left and right flange node plates serve as the first and second nodes. The first and second nodes are bolted to the embedded T-shaped steel with bolt grooves at the bottom of the adjacent T-beam webs. The third node uses the two parallel node plates to pass through steel bars and then cast in the post-cast strip concrete between the adjacent T-beam flanges. The three nodes are welded to form a triangular truss structure by steel pipe welding, and stiffening ribs are welded near the steel pipes at the first and second nodes. It can not only improve the bearing capacity and integrity of the bridge diaphragm, but also solve the problem of diaphragm dislocation due to assembly errors. At the same time, it is necessary to ensure the convenience of construction and propose a new solution to the defects of traditional concrete diaphragms.

Description

Technical Field

[0001] The invention belongs to the field of bridge diaphragm beams and relates to a novel steel diaphragm beam structure which can avoid the dislocation problem caused by assembly errors of assembled T-beam bridges. Background Art

[0002] In recent years, transportation has developed rapidly, and the demand for transportation facilities has also increased. With the increase in operating loads, especially the effect of vehicle overloading, the damage of diaphragms has gradually become one of the common diseases of bridges. At the same time, during the assembly and connection of diaphragms, there will be problems such as non-coplanarity between diaphragms, misalignment, poor welding quality of diaphragm steel bars, or loose casting. In actual construction practice, due to the assembly error of prefabricated beam bridges, it is easy to cause the dislocation of diaphragms. Therefore, the form of diaphragm damage is mostly caused by its own structural problems. Traditional diaphragms need to be further upgraded and changed to adapt to today's environment, and are required to have better economy, durability and practicality.

[0003] Steel diaphragm is a more economical and quick structure. Compared with other diaphragm, steel diaphragm has the advantages of light weight, strong tensile strength, simple construction, and less total design and construction period. During the repair and reinforcement process, steel diaphragm can also be constructed under smooth traffic conditions. Summary of the invention

[0004] In order to overcome the disadvantage of easy dislocation of existing steel diaphragms, the present invention provides a three-point adjustable steel truss T-beam diaphragm. This design can not only improve the stress performance and integrity of the bridge diaphragm, but also solve the problem of diaphragm dislocation due to assembly errors, while ensuring the convenience of construction, and proposing a new solution to the defects of traditional concrete diaphragms.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A three-point adjustable steel truss type T-beam diaphragm comprises two left and right bottom flange nodes and two parallel node plates, wherein the two left and right bottom flange node plates serve as the first and second nodes, and the first and second nodes are bolted to the embedded T-shaped steel with bolt grooves at the bottom of the adjacent T-beam webs; the third node adopts the two parallel node plates to pass steel bars and then be cast in the post-cast strip concrete between the adjacent T-beam flanges, the three nodes are welded and connected to form a triangular truss structure by steel pipes, and stiffening ribs are welded near the steel pipes at the first and second nodes.

[0007] Furthermore, the third node makes full use of the wet joint space position, and the upper part is extended into the wet joint position before pouring, and the reserved hole is passed through the steel bar and then poured together with the post-casting section.

[0008] The bolt groove is a waist-shaped groove. Of course, it can also be other shapes as long as the bolt can achieve position adjustment.

[0009] In the present invention, a three-point truss structure is adopted to form a certain plane, and compared with a four-point or multi-point structure, it has more stability and better force-bearing performance, and has better integrity when connected with the T-beam body.

[0010] The three-point adjustable steel truss T-beam cross beam is pre-assembled as a whole, which is convenient for factory production and production, and effectively reduces the difficulty of the construction site. Only bolt connection is required on site, saving labor costs.

[0011] In the present invention, during installation, the truss-type steel diaphragm is prefabricated as a whole before being erected and installed. The horizontal and vertical errors of the diaphragm position generated by the T-beam assembly are adjusted by adjusting the bottom bolt connection position. The vertical and inclination errors of the diaphragm are then adjusted by the top reinforcement position. Since the third point of the truss is in the post-casting zone concrete, the vertical error will not have an adverse effect on the structure, thereby achieving three-point adjustment.

[0012] The beneficial effects of the present invention are mainly manifested in: not only can the stress-bearing performance and integrity of the bridge diaphragm be improved, but also the problem of diaphragm misalignment due to assembly errors can be solved, while ensuring the convenience of construction, and proposing a new solution to the defects of traditional concrete diaphragms. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure plane of the present invention;

[0014] Figure 2 It is a three-dimensional cross-sectional schematic diagram of the structure of the present invention;

[0015] Figure 3 A three-dimensional schematic diagram of the top node plate structure of the present invention;

[0016] Figure 4 This is a three-dimensional schematic diagram of the first node structure and connection structure at the bottom of the present invention;

[0017] In the figure: 1-the first node, 2-the second node, 3-the third node, 4-truss diagonal bracing steel pipe, 5-truss cross bracing steel pipe, 6-embedded T-steel, 7-stiffening rib, 8-bolt, 9-bolt slot, 10-reserved hole. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Reference Figure 1 to Figure 4A three-point adjustable steel truss type T-beam cross beam comprises two left and right bottom flange node plates and two parallel node plates, wherein the two left and right bottom flange node plates serve as the first node 1 and the second node 2, and the first node 1 and the second node 2 are connected with the embedded T-shaped steel 6 with bolt grooves 9 at the bottom of the adjacent T-beam web by bolts 8; the third node 3 adopts two parallel node plates to pass through steel bars and then be cast in the post-cast strip concrete between the adjacent T-beam flanges, and the three node points are welded and connected to form a triangular truss structure by steel pipes 4 and 5, and stiffening ribs 7 are welded near the steel pipes at the first node 1 and the second node 2.

[0020] Furthermore, the third node 3 makes full use of the wet joint space position, and the upper part extends into the wet joint position before pouring, and the reserved hole 10 is poured together with the post-casting section after passing the steel bar.

[0021] The bolt slot 9 is a waist-shaped slot. Of course, it can also be other shapes as long as the bolt 8 can achieve position adjustment.

[0022] In this embodiment, a three-point truss structure is adopted to form a certain plane, and compared with a four-point or multi-point structure, it has more stability and better stress-bearing performance, and has better integrity when connected with the T-beam body.

[0023] The three-point adjustable steel truss T-beam cross beam is pre-assembled as a whole, which is convenient for factory production and production, and effectively reduces the difficulty of the construction site. Only high-strength bolts are needed on site to save labor costs.

[0024] like Figure 3 As shown, the third node 3 at the top makes full use of the wet joint space position, and the upper part extends into the wet joint position before pouring, and the reserved hole 10 is poured together with the post-casting section after passing the steel bar.

[0025] like Figure 4 As shown in the figure, when installing the steel diaphragm, the truss-type steel diaphragm is prefabricated as a whole before erection and installation. First, the horizontal and vertical errors of the diaphragm position caused by the T-beam assembly are adjusted by adjusting the bottom bolt connection position. Then, the vertical and inclination errors of the diaphragm are adjusted by the top reinforcement position. Since the third node of the truss is in the post-cast concrete, the vertical error will not have an adverse effect on the structure, thus achieving three-point adjustment.

Claims

1. A three-point adjustable steel truss T-beam diaphragm, characterized in that: The T-beam cross beam includes two left and right bottom flange nodes and two parallel node plates. The two left and right bottom flange node plates serve as the first and second nodes. The first and second nodes are connected to the embedded T-shaped steel with bolt grooves at the bottom of the adjacent T-beam webs by bolts; the third node adopts the two parallel node plates to pass through steel bars and then be cast in the post-cast strip concrete between the adjacent T-beam flanges. The three nodes are connected to form a triangular truss structure by welding steel pipes, and stiffening ribs are welded near the steel pipes at the first and second nodes; the third node makes full use of the wet joint space position, extends into the wet joint position before the upper part is cast, and the reserved holes are cast together with the post-cast section after passing through steel bars; the bolt groove is a waist-shaped groove.

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