CN204266439U - Based on the novel compositions girder construction of steel-ultra-high performance concrete - Google Patents

Abstract

The utility model relates to a novel composite beam structure based on steel-ultra-high-performance concrete, which comprises a plurality of parallel steel beams, and a concrete flange plate is arranged on the upper part of the steel beams. The new composite beam structure based on steel-ultra-high-performance concrete can effectively solve the cracking problem of the composite beam flange plate and improve the durability of the composite beam structure. The structure is simple, the material is novel and the mechanical properties are good, and it has good mechanical properties and economic benefits.

Description

New Composite Beam Structure Based on Steel-Ultra High Performance Concrete

technical field

The utility model relates to the technical field of civil engineering, and is a novel composite beam structure based on steel-ultra high-performance concrete.

Background technique

The conventional steel-concrete composite beam is a structure composed of exposed steel beams or steel truss beams and reinforced concrete slabs through connectors (shear keys). This type of bridge has fast construction speed, small building height and good seismic performance. It has been widely used in housing construction, highway and urban bridge construction. Due to the continuous increase of traffic volume and heavy vehicles, coupled with the impact of the environment, the conventional steel-concrete composite beams have longitudinal cracking of reinforced concrete wing plates, transverse cracking of reinforced concrete bridge decks, partial cracking or corrosion of bridge decks, etc. Corrosion of steel beams and other diseases seriously affect the service life of bridges. The main reason is that ordinary reinforced concrete (NRC) slabs have low strength, poor toughness, and high porosity, and are prone to damage under load and environment, reducing their service life. Ultra-high performance concrete (UHPC) is a kind of high-strength, high-durability, high-toughness, dense concrete formed by fine sand as aggregate, mixed with a large amount of mineral admixtures such as silica fume, high-efficiency water reducer and fine steel fibers. Compared with ordinary concrete, it removes coarse aggregate (stone), and is a high-performance concrete composed of fine-grained dense materials and fiber-reinforced materials. The compressive strength and tensile strength are higher than ordinary concrete. Much higher. Although UHPC has good performance, its cost is much higher than that of ordinary concrete. It would be uneconomical to use UHPC for all bridge decks.

Utility model content

The purpose of this utility model is to provide a new type of composite beam structure based on steel-ultra-high performance concrete, which improves the durability of the composite beam. The structure is simple, the material is novel, and the mechanical properties are good. Mechanical properties and economic benefits.

The solution adopted by the utility model to solve the technical problem is a new composite beam structure based on steel-ultra-high performance concrete, which is characterized in that it includes several parallel steel beams, and the upper part of the steel beams is provided with concrete flanges plate.

Further, the concrete flange plate includes several ordinary concrete prefabricated slabs placed between the upper parts of two adjacent steel beams, and the steel beams at the joints between the ordinary concrete prefabricated slabs are welded with shear connectors , the joints between the ordinary concrete prefabricated slabs are all poured with ultra-high performance concrete or ordinary concrete, and the upper part of the ordinary concrete precast slabs is poured with an ultra-high performance concrete surface layer A.

Further, the concrete flange plate includes several ultra-high performance concrete prefabricated slabs placed between the upper parts of two adjacent steel beams, and the steel beams at the joints between the ultra-high performance concrete prefabricated slabs are welded with As for the shear connector, the upper part of the ultra-high performance concrete prefabricated slab and the joints are poured with a common concrete layer, and the upper part of the common concrete layer is poured with a super high performance concrete surface layer B.

Further, the steel girder is ordinary-strength steel, high-strength steel or ultra-high-strength steel.

Further, the ultra-high performance concrete is configured with steel bars or without steel bars.

Compared with the prior art, the utility model has the following beneficial effects: the new composite beam structure based on steel-ultra-high performance concrete utilizes the high strength and high toughness of ultra-high performance concrete to significantly improve the durability of the flange plate, and can effectively Solve the cracking problem of the steel-concrete composite beam flange plate, reduce the self-weight, and combine with ordinary concrete to achieve good mechanical properties and economic benefits, especially in the field of deck systems of small-span bridges and long-span bridges.

Description of drawings

Below in conjunction with accompanying drawing, the utility model patent is further described.

Fig. 1 is a kind of embodiment structural representation of this utility model;

Fig. 2 is another kind of embodiment structural representation of this utility model;

In the picture:

1-steel beam; 2-ordinary concrete precast slab; 3-ultra-high performance concrete surface layer A; 4-shear connector; 5-ultra-high performance concrete precast slab; 6-ordinary concrete layer; 7-ultra-high performance concrete Topping B.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.

As shown in Figures 1-2, a new composite beam structure based on steel-ultra-high performance concrete is characterized in that it includes several parallel steel beams 1, and the upper part of the steel beams 1 is provided with a concrete flange plate.

In this embodiment, the concrete flange plate includes several ordinary concrete prefabricated slabs 2 placed between the upper parts of two adjacent steel beams 1, and the steel beams 1 at the joints between the ordinary concrete prefabricated slabs 2 A shear connector 4 is welded on the upper part, and the joints between the ordinary concrete prefabricated slabs 2 are poured with ultra-high performance concrete or ordinary concrete, and the upper part of the ordinary concrete precast slab 2 is poured with an ultra-high performance concrete surface layer A3 .

In this embodiment, the concrete flange plate includes several ultra-high performance concrete prefabricated panels 5 placed between the upper parts of two adjacent steel beams 1, and the joints between the ultrahigh performance concrete prefabricated panels 5 The steel beam 1 is welded with a shear connector 4, the upper part of the ultra-high performance concrete prefabricated slab 5 and the joints are poured with an ordinary concrete layer 6, and the upper part of the ordinary concrete layer 6 is poured with an ultra-high performance concrete surface Layer B7.

In this embodiment, the steel beam 1 is a normal-strength steel, a high-strength steel or an ultra-high-strength steel.

In this embodiment, steel bars or no steel bars are arranged in the ultra-high performance concrete.

The specific implementation process: firstly, ordinary concrete prefabricated slabs 2 are first placed on two adjacent steel beams 1 juxtaposed, and then shear connectors 4 are welded on the upper part of the steel beams 1 at the joints between ordinary concrete prefabricated slabs 2, Then pour a layer of ultra-high performance concrete or ordinary concrete in the joints between the ordinary concrete prefabricated slabs 2, and finally pour a layer of ultra-high performance concrete surface layer A3 on the top of the ordinary concrete precast slabs 2. Another composite beam structure is to place ultra-high performance concrete prefabricated slabs 5 on two adjacent steel beams 1 that are juxtaposed, and then weld the upper part of the steel beams 1 at the joints between the ultra-high performance concrete prefabricated slabs 5. Cut the connecting piece 4, then pour ordinary concrete layer 6 on the upper part of the ultra-high performance concrete prefabricated slab 5 and in the joints, and finally cast a layer of ultra-high performance concrete surface layer B on the ordinary concrete layer 6.

The above preferred embodiments have further described the purpose, technical solutions and advantages of the utility model in detail. It should be understood that the above descriptions are only preferred embodiments of the utility model and are not intended to limit the utility model. For new models, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims (5)

1. A novel composite beam structure based on steel-ultra-high-performance concrete, characterized in that: it comprises several parallel steel beams, and the top of the steel beams is provided with a concrete flange plate. 2. The novel composite beam structure based on steel-ultra-high performance concrete according to claim 1, characterized in that: said concrete flange slabs include several ordinary concrete prefabricated slabs placed between the upper parts of two adjacent steel beams , the steel beams at the joints between the ordinary concrete prefabricated slabs are welded with shear connectors, and the joints between the ordinary concrete precast slabs are poured with ultra-high performance concrete or ordinary concrete, and the ordinary concrete precast slabs are poured with ultra-high performance concrete or ordinary concrete The upper part of the concrete prefabricated slab is poured with an ultra-high performance concrete surface layer A. 3. The novel composite beam structure based on steel-ultra-high performance concrete according to claim 1, characterized in that: the concrete flange plate includes several ultra-high performance concrete placed between the upper parts of two adjacent steel beams Prefabricated slabs, the steel beams at the joints between the ultra-high performance concrete prefabricated slabs are welded with shear connectors, the upper part of the ultra-high performance concrete prefabricated slabs and the joints are poured with ordinary concrete layers, so The upper part of the ordinary concrete layer is poured with an ultra-high performance concrete surface layer B. 4. The new composite beam structure based on steel-ultra-high performance concrete according to claim 1, characterized in that: the steel beam is a normal-strength steel, a high-strength steel or an ultra-high-strength steel. 5. The new composite beam structure based on steel-ultra-high-performance concrete according to claims 2 and 3, characterized in that: the ultra-high-performance concrete is equipped with steel bars or no steel bars.