CN201952977U - Prestressed fiber reinforce plastic (FRP) rebar high-strength concrete board band - Google Patents

Abstract

The utility model relates to a high-strength concrete slab with prestressed FRP bars used in concrete structures such as bridges, water conservancy projects, and seaport wharves. The slab strip includes a high-strength concrete slab strip main body and at least two FRP bars. The FRP bars are embedded in the high-strength concrete slab strip main body. The vertical ribs perpendicular to the bottom surface of the main body or the oblique ribs forming an angle α of 30-60° with the bottom surface of the high-strength concrete slab belt main body, the longitudinal section of the main body of the high-strength concrete slab belt is rectangular, square, circular, L-shaped or I-shaped . Compared with FRP high-strength concrete composite bars, the utility model has the advantages of high bearing capacity, wide application range, and can directly become a stressed member; Rigidity, increased component strength, improved component ductility and full use of FRP materials and other advantages.

Description

A prestressed FRP bar high-strength concrete slab strip

technical field

The utility model relates to a high-strength concrete slab with prestressed FRP bars used in concrete structures such as bridges, water conservancy projects, and seaport wharves.

Background technique

The corrosion of prestressed steel bars and ordinary steel bars in concrete structures such as bridges, water conservancy projects, and seaports has always been a topic of concern and a challenge faced by civil engineering circles at home and abroad. Such problems are particularly prominent in areas where antifreeze salt is used in large quantities in winter and in areas near the sea. Existing engineering practices have shown that the reinforcement and maintenance costs required to maintain the normal performance of the structure are usually several times the cost of the structure itself.

How to improve the durability of reinforced concrete structures and increase their service life is an urgent problem in civil engineering. The applicant of this patent application applied for and obtained the utility model patent of "New FRP Prestressed Composite Bar" in early 2010, which discloses a new type of FRP prestressed composite bar. The composite bar includes high-strength concrete prisms and FRP bars. The FRP bars are embedded in the high-strength concrete prism, and ribs are arranged on both sides of the high-strength concrete prism. The composite bar has the advantages of delaying crack development, reducing crack width, improving component stiffness, increasing component strength, improving component ductility, and making full use of FRP materials. However, compared with FRP high-strength concrete prism composite bars , the composite bar is embedded in a single FRP bar, and the cross-section of the member is small, so it is easy to cause the end of the prismatic composite bar to be crushed and damaged when the prestress is applied, resulting in the prestress level and bearing capacity of the prismatic composite bar relative to the high-strength concrete slab strip of the FRP bar lower. At the same time, the strips can be specially made into different shapes and cross-sectional forms according to the actual situation of the project, which is convenient for assembly into composite beams, composite columns and special-shaped column structures, and can even directly become a stressed member.

Contents of the invention

The technical problem to be solved by the utility model is: to provide a prestressed FRP bar high-strength concrete slab belt which has the advantages of high bearing capacity, wide application range, and the advantages of being able to directly become a stressed member compared with FRP high-strength concrete composite bars, to solve The above-mentioned existing technical problems.

The technical solution for solving the above technical problems is: a prestressed FRP bar high-strength concrete slab, including a high-strength concrete slab body and at least two FRP bars, and the FRP bars are embedded in the high-strength concrete slab body.

The two sides of the main body of the high-strength concrete slab are also provided with ribs, and the ribs are vertical ribs perpendicular to the bottom surface of the main body of the high-strength concrete slab or form a 30-60° included angle α with the bottom surface of the main body of the high-strength concrete slab. Diagonal ribs.

The FRP tendons are CFRP tendons, GFRP tendons, BFRP tendons or AFRP tendons.

The longitudinal section of the main body of the high-strength concrete slab is rectangular, square, circular, L-shaped or I-shaped.

The prestressed FRP bar high-strength concrete slab belt of the utility model is an improvement to the prestressed FRP high-strength concrete prismatic composite bar. First of all, the strip overcomes the shortcoming of the small cross-section of the composite rib, which is more conducive to avoiding the local extrusion damage at the end of the strip due to the application of high prestress, and its bearing capacity is greatly improved compared with the composite rib. Secondly, the section form of the strip is flexible, which can be rectangular, square, circular, L-shaped, I-shaped or a special geometric shape according to actual engineering needs, and has a wide range of applications. Finally, due to the high bearing capacity, the strip can directly become a stressed member, and can even be assembled into a composite beam, a composite column, and a special-shaped column structure at the construction site, which solves the technical problem of tension and prestressing at the construction site, and at the same time improves the construction efficiency. work efficiency and progress. It is suitable for large-span building structures, bridges, military projects, etc.

In addition, compared with ordinary FRP reinforced concrete components, the utility model has the advantages of delaying crack development, reducing crack width, increasing component stiffness, increasing component strength, improving component ductility and making full use of FRP materials. Concrete slabs can be factory prefabricated and customized, and the quality and mechanical properties of composite bars can be strictly controlled. Compared with ordinary prestressed FRP bars, prestressed FRP bar high-strength concrete slabs also have the advantages of convenient construction and better ductility. . There are ribs on both sides of the main body of the high-strength concrete slab. The addition of ribs on both sides can increase the roughness coefficient between the FRP-PCP bar and the surrounding concrete, and improve the friction between the concrete, thereby strengthening the main body of the high-strength concrete slab and the surrounding. Improve the bonding strength of concrete and improve the crack resistance of the main components of high-strength concrete slabs. Therefore, the prestressed FRP bar high-strength concrete slab strip of the present invention has good research significance and application prospects as an innovative structural technology combining new materials and prestressing technology.

Below, the technical characteristics of the prestressed FRP bar high-strength concrete slab strip of the present invention will be further described in conjunction with the accompanying drawings and embodiments.

Description of drawings

Figures 1 to 3: Schematic diagram of the structure of the prestressed FRP bar high-strength concrete slab strip in Embodiment 1 of the present invention:

Figure 1: Front view, Figure 2: A-A sectional view of Figure 1, Figure 3: B-B sectional view of Figure 1.

Figure 4 to Figure 5: Schematic diagram of the structure of the prestressed FRP bar high-strength concrete slab belt in the second embodiment of the utility model:

Figure 4: Front view, Figure 5: Left view.

Figure 6: Prestressed FRP reinforced high-strength concrete slab with vertical ribs.

In the picture:

1-High-strength concrete slab with main body, 2-FRP bars, 31-diagonal ribs, 32-vertical ribs.

Detailed ways

Embodiment one:

A prestressed FRP bar high-strength concrete slab (see Figures 1 to 3), including a high-strength concrete slab body 1 and two FRP bars 2, and the two FRP bars are embedded in the high-strength concrete slab body 1.

Embodiment two:

A prestressed FRP bar high-strength concrete slab (see Figures 4 to 5), including a high-strength concrete slab body 1 and three FRP bars 2, the three FRP bars are embedded in the high-strength concrete slab body 1, and the high-strength concrete Both sides of the slab main body 1 are also provided with oblique ribs 31 forming an angle α of 45° with the bottom surface of the high-strength concrete slab main body.

As a modification of the second embodiment, the angle α can be increased or decreased according to the actual situation, and is generally 30-60°.

As another modification of the second embodiment, the two sides of the high-strength concrete slab main body 1 are provided with vertical ribs 32 perpendicular to the bottom surface of the high-strength concrete slab main body (see FIG. 6 ).

The FRP bars described in each embodiment of the utility model can be CFRP bars (carbon fiber bars), GFRP bars (glass fiber bars), BFRP bars (basalt fiber bars) or AFRP bars (aramid fiber bars), the diameter of the FRP bars, The prestress level is determined according to the actual load of the stressed member. The cross-sectional size of the main body of the high-strength concrete slab belt of the utility model and the number of FRP bars embedded in the main body of the high-strength concrete slab belt are determined according to the actual situation of the project. The layout of the FRP bars is determined according to calculation and structural requirements. Two adjacent FRP bars The ribs are generally equally spaced.

The longitudinal section of the main body of the high-strength concrete slab strip described in each embodiment of the utility model is generally rectangular, square, circular, L-shaped, I-shaped or a special geometric shape according to actual engineering needs.

Claims (4)

1. pre-stress FRP muscle high-strength concrete strip, it is characterized in that: comprise high-strength concrete strip main body (1) and at least 2 FRP muscle (2), the FRP muscle is imbedded in the high-strength concrete strip main body.

2. a kind of pre-stress FRP muscle high-strength concrete strip according to claim 1, it is characterized in that: described high-strength concrete strip main body (1) two sides also are provided with the rib line, rib line or the perpendicular rib line (32) vertical with high-strength concrete strip main body bottom surface or form the diagonal rib line (31) of 30～60 ° of angle α with high-strength concrete strip main body bottom surface.

3. a kind of pre-stress FRP muscle high-strength concrete strip according to claim 1 and 2, it is characterized in that: described FRP muscle is CFRP muscle, GFRP muscle, BFRP muscle or AFRP muscle.

4. a kind of pre-stress FRP muscle high-strength concrete strip according to claim 1 and 2 is characterized in that: described high-strength concrete strip main body longitudinal section is rectangle, square, circle, L shaped or I shape.

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