CN220184435U - A new type of UHPC-HPC gradient durability composite T-beam - Google Patents

Abstract

The utility model relates to a novel UHPC-HPC gradient durability combined T beam, which belongs to the technical field of buildings and comprises a compression beam and a tension beam which are made of ultra-high performance concrete materials, wherein a beam made of high performance concrete materials is arranged between the compression beam and the tension beam; the compression beam, the tension beam and the cross beam are internally provided with fiber grids for connecting the compression beam, the tension beam and the cross beam; carbon steel bars are arranged in the compression beam, steel-fiber composite bars are arranged in the tension beam, and the carbon steel bars and the steel-fiber composite bars are positioned in the fiber grid. The compression beam adopts ultra-high performance concrete (UHPC) material and carbon steel to bear pressure, and the ultra-high performance concrete (UHPC) in a tension area and the steel-fiber composite rib cooperate together, so that the tensile strength of the beam can be improved, the durability of the combined T beam can be greatly improved, the dead weight of the beam can be lightened, the compression beam has the characteristics of high strength, good crack resistance, strong durability and excellent economy, has better practicability and environmental friendliness, and can effectively solve the problem of poor durability and crack resistance of the traditional beam.

Description

A new type of UHPC-HPC gradient durability composite T-beam

Technical field

The utility model belongs to the field of construction technology, and specifically relates to a new type of UHPC-HPC gradient durability composite T-beam.

Background technique

Ultra-high performance concrete is an ultra-high performance concrete cement-based composite material that has better ductility, higher tensile strength and compressive strength than ordinary high-strength concrete. Since the concept of ultra-high performance concrete (UHPC) was proposed, its ultra-high mechanical properties and excellent durability have attracted close attention from scholars in the field of engineering materials. These significant advantages make it have great application prospects in the construction of bridges, tunnels, railway projects, prefabricated buildings and other fields.

With the development of my country's construction industry, more and more new building materials are used in infrastructure construction, and reinforced concrete structures are still the most commonly used building structures. At this stage, our country is in a period of equal emphasis on the repair and transformation of reinforced concrete structures. stage. As the service life increases or the reinforced concrete structure is damaged due to external physical and chemical reasons, its reliability is reduced and it can no longer continue to bear the load safely. The damage to the reinforced concrete structure will not only endanger social and public safety, but also cost a fortune to repair. Huge financial expenditure. Therefore, the damage of reinforced concrete structures is a serious problem for any country. In order to effectively solve this problem, ensure that the repaired structure has normal bearing capacity, extend the interval between its next repairs, and minimize economic expenditure, it is necessary to find a repair material with equally excellent mechanical properties and durability to complete this task. One task seems extremely important. Compared with traditional materials, ultra-high performance concrete has been greatly improved in terms of strength, toughness and durability. It also has excellent wear resistance, anti-explosion properties and lighter structural weight, and even has a certain degree of self-propelledness. Repair function.

Utility model content

The utility model provides a new type of UHPC-HPC gradient durability composite T-beam. The steel-fiber composite bars are arranged in the tension area of the beam, which can greatly improve the durability of the composite T-beam, reduce the self-weight of the beam, and achieve high strength and resistance. It has the advantages of good cracking performance, strong durability and excellent economy.

In order to achieve the above purpose, the present utility model is achieved through the following technical solutions:

A new type of UHPC-HPC gradient durability composite T-beam, including a compression beam and a tension beam made of ultra-high performance concrete, with a high-performance concrete cross beam between the compression beam and the tension beam; the compression beam, There are fiber meshes connecting the three in the tension beams and cross beams; carbon steel bars are installed in the compression beams, and steel-fiber composite bars are installed in the tension beams. The carbon steel bars and steel-fiber composite bars are located in the fiber mesh. Within the grid.

Further, a roughening layer in the compression area is provided above the beam, and a roughening layer in the tension area is provided above the tension beam.

Furthermore, the distance from the roughened layer in the tension zone to the uppermost layer of steel-fiber composite bars is 20-25mm.

Further, the steel-fiber composite bars are any one of steel-basalt fiber bars, steel-carbon fiber bars, steel-glass fiber bars, and steel-aramid fiber bars.

Further, the fiber mesh is any one of basalt fiber mesh, carbon fiber mesh, glass fiber mesh, and aramid fiber mesh.

Further, the cross section of the fiber mesh is rectangular.

Beneficial effects of this utility model:

The compression beam of this utility model is made of ultra-high performance concrete (UHPC) and carbon steel to withstand pressure. The cooperation of ultra-high performance concrete (UHPC) and steel-fiber composite bars in the tension area can not only improve the tensile strength of the beam, but also It can greatly improve the durability of the combined T-beam and reduce its own weight. The utility model has the characteristics of high strength, good crack resistance, strong durability and excellent economy. It meets the requirements of green building economic development, has good practicability and environmental protection, and can effectively solve the problem of poor durability and crack resistance of traditional beams. The problem.

Description of drawings

Figure 1 is a schematic cross-sectional structural diagram of the utility model;

Figure 2 is a schematic structural diagram of the fiber mesh in the utility model;

Figure 3 is a schematic structural diagram of the steel-fiber composite bar in the utility model;

Figure 4 is a schematic vertical cross-sectional view of the utility model.

In the figure, 1-1, tension beam; 1-2, compression beam; 1-3, rough layer in compression area; 1-4, rough layer in tension area; 2, cross beam; 3, carbon steel bar ; 4. Steel-fiber composite bars; 4-1. Ribbed steel bars; 4-2. Dip fiber bundles; 5. Fiber mesh.

Detailed ways

In order to make the purpose, technical solution and beneficial effects of the present utility model clearer, the preferred embodiments of the present utility model will be described in detail below to facilitate the understanding of skilled persons.

Embodiment 1, a new type of UHPC-HPC gradient durability composite T-beam, with reference to Figures 1-4, including a compression beam 1-2 and a tension beam 1-1 made of ultra-high performance concrete. The compression beam 1- The compressive strength of ultra-high performance concrete (UHPC) for 2 is 120-200MPa, and the tensile strength of ultra-high performance concrete (UHPC) for tension beam 1-1 is 5-14MPa. The compression beam 1-2 and the tension beam There is a beam 2 made of high-performance concrete (HPC) between 1-1. The compressive strength of the high-performance concrete (HPC) of beam 2 is 50-80MPa; the compression beam 1-2, the tension beam 1-1 and The cross beam 2 is provided with a fiber grid 5 connecting the three; the compression beam 1-2 is provided with carbon steel bars 4, the tension beam 1-1 is provided with steel-fiber composite bars 4, carbon steel bars 3 and The steel-fiber composite bars 4 are located in the fiber grid 5, and the fiber grid 5 has a rectangular cross-section.

The steel-fiber composite bars 4 can be any one of steel-basalt fiber bars, steel-carbon fiber bars, steel-glass fiber bars, steel-aramid fiber bars, and the steel-fiber composite bars 4 contain 20%- 65%.

The fiber mesh 5 can be any one of basalt fiber mesh, carbon fiber mesh, glass fiber mesh, and aramid fiber mesh.

There is a rough layer 1-3 in the compression area above the beam 2. There is a rough layer 1-4 in the tension area above the tension beam 1-1. The rough layer 1-4 in the tension area reaches the top layer of steel 4-fiber. The distance of composite ribs is 20-25mm.

Embodiment 2, a method for manufacturing a new type of UHPC-HPC gradient durability composite T-beam:

First, the tension beam 1-1 is poured. Within 30-45 minutes after the pouring is completed, a rough layer 1 is drilled in the tension area with an anchor width and depth of 10-20mm on the surface of the incompletely solidified ultra-high performance concrete tension beam 1-1. -4. The spacing between adjacent pits in the roughened layer 1-4 in the tension area is 1.5-3 times the roughened width. After the initial setting of the ultra-high-performance concrete tension beam 1-1, the high-performance concrete beam 2 is poured. Within 30-60 minutes after the pouring of the high-performance concrete beam 2 is completed, chisel the rough layer 1-4 in the pressure area with an anchor width and depth of 10-20mm on the surface of the high-performance concrete beam 2 that is not completely solidified. The spacing between adjacent pits on layers 1-4 is 1.5-3 times the width of the anchor. After the high-performance concrete beam 2 is initially set, ultra-high-performance concrete compression beams 1-2 are poured until the beam pouring is completed.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be implemented in the form Various changes can be made to the design and details without departing from the scope of the invention as defined by the claims.

Claims (6)

1. A novel UHPC-HPC gradient durability composite T-beam, characterized in that: the beam comprises a compression beam and a tension beam which are made of ultra-high performance concrete, wherein a beam made of high performance concrete is arranged between the compression beam and the tension beam; the compression beam, the tension beam and the cross beam are internally provided with fiber grids for connecting the compression beam, the tension beam and the cross beam; carbon steel bars are arranged in the compression beam, steel-fiber composite bars are arranged in the tension beam, and the carbon steel bars and the steel-fiber composite bars are positioned in the fiber grid.

2. A novel UHPC-HPC gradient durability composite T-beam according to claim 1, characterized in that: and a compression zone roughening layer is arranged above the cross beam, and a tension zone roughening layer is arranged above the tensile beam.

3. A novel UHPC-HPC gradient durability composite T-beam according to claim 2, characterized in that: the distance from the roughening layer of the tension zone to the uppermost steel-fiber composite bar is 20-25mm.

4. A novel UHPC-HPC gradient durability composite T-beam according to claim 1, characterized in that: the steel-fiber composite rib is any one of steel-basalt fiber rib, steel-carbon fiber rib, steel-glass fiber rib and steel-aramid fiber rib.

5. A novel UHPC-HPC gradient durability composite T-beam according to claim 1, characterized in that: the fiber mesh is any one of basalt fiber mesh, carbon fiber mesh, glass fiber mesh and aramid fiber mesh.

6. A novel UHPC-HPC gradient durability composite T-beam according to claim 1, characterized in that: the cross section of the fiber grid is rectangular.