Structure for reinforcing concrete column by partially embedding carbon fibers

Abstract

According to the structure for reinforcing the concrete column by locally embedding the carbon fibers, the carbon fibers are locally embedded in the concrete column and then blocked by the ultra-high-performance concrete, so that the reliability of reinforced connection between the carbon fibers and the existing concrete column is further enhanced, and the safe service of the existing structural column is ensured; the anti-seismic toughness of the existing building can be further improved. The carbon fiber cloth coated concrete column comprises a concrete column body and carbon fiber cloth, carbon fiber primer is coated on the surface of the concrete column body needing to be coated with the carbon fiber cloth, carbon fiber dipping glue is coated on the carbon fiber primer, and the carbon fiber cloth is adhered to the surface of the concrete column body through the carbon fiber dipping glue. The composite material is characterized by further comprising ultra-high performance concrete; a concrete column groove is formed in the concrete column, and the concrete column groove is formed in the length direction of the concrete column. On the surface of the concrete column groove, the carbon fiber cloth is connected end to end to form double-layer overlapping; and the ultra-high performance concrete is poured into the concrete column groove for blocking.

Description

Technical Field

[0001] The utility model relates to a carbon fiber partially embedded reinforced concrete column structure. Background Art

[0002] As my country's urbanization enters the middle and late stages, urban development has begun to shift from incremental construction to stock renewal, and there is a huge market demand for the renewal and transformation of existing building structures. Since my country's fifth-generation "China Earthquake Motion Parameter Zoning Map" implements full coverage of earthquake fortification areas, the seismic reinforcement of existing building structures in areas where the peak acceleration is less than 0.05g in the fourth-generation earthquake zoning map is a more prominent issue during the renewal and transformation process. For buildings that have not been seismically fortified, if the longitudinal reinforcement of the structural column meets the requirements during the review calculation, but the axial compression ratio exceeds the limit, and the volume stirrup ratio verification does not meet the requirements of the current specifications, the seismic reinforcement measures can be to wrap the structural column with carbon fiber cloth. The circumferential constraint formed is similar to the additional stirrups, which can enhance the constraint effect on the core concrete of the existing structural column and improve its bearing capacity and ductility.

[0003] Carbon fiber has the advantages of low dead weight, high tensile strength, convenient construction, and economical cost. Carbon fiber cloth reinforcement of existing structural columns is one of the more commonly used reinforcement technologies in the field of structural reinforcement. However, since carbon fiber and structural columns are only bonded by structural adhesive, due to the uneven quality of structural adhesive and reinforcement construction level, structural adhesive failure often occurs, causing carbon fiber to peel off and fall off, which greatly affects the safety performance of existing buildings. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a carbon fiber partially embedded reinforced concrete column structure with a reasonable structural design. By adding carbon fiber partially embedded in the concrete column and then sealing it with ultra-high performance concrete, the reliability of the reinforced connection between the carbon fiber and the existing concrete column is further enhanced, ensuring the safe service of the existing structural column, which helps to further improve the seismic toughness of the existing building.

[0005] The technical solution adopted by the utility model to solve the above-mentioned problem is: a carbon fiber partially embedded reinforced concrete column structure, comprising a concrete column and a carbon fiber cloth, a carbon fiber primer is applied on the surface of the concrete column to be wrapped with the carbon fiber cloth, a carbon fiber impregnation glue is applied on the carbon fiber primer, and the carbon fiber cloth is adhered to the surface of the concrete column through the carbon fiber impregnation glue; it is characterized in that: it also includes ultra-high performance concrete; a concrete column groove is opened on the concrete column, and the concrete column groove is arranged along the length direction of the concrete column; on the surface of the concrete column groove, the carbon fiber cloth is connected end to end to form a double layer overlap; the ultra-high performance concrete is poured into the concrete column groove for sealing.

[0006] The utility model forms the concrete column groove by chiseling from the surface of the concrete column to the surface of the concrete column reinforcement.

[0007] The vertical length of the concrete column groove described in the utility model is the full length of the concrete column.

[0008] The concrete column groove of the utility model is in the shape of a trapezoid which is wide outside and narrow inside.

[0009] The outer width of the concrete column groove described in the utility model is not less than 1 / 5 of the column side length of the concrete column and is not less than 100mm.

[0010] The surface of the concrete column groove of the utility model forms a roughened surface.

[0011] The carbon fiber impregnated adhesive of the utility model is a modified epoxy resin structural adhesive.

[0012] The finished surface of the ultra-high performance concrete of the utility model is flush with the surface of the concrete column.

[0013] Compared with the prior art, the utility model has the following advantages and effects:

[0014] 1. Strengthen the reliability of the reinforced connection between carbon fiber cloth and existing concrete columns, and improve the seismic toughness of existing buildings. When existing carbon fiber cloth is used to reinforce concrete columns, it only relies on structural adhesive to bond with existing structural columns. The carbon fiber cloth is easily peeled off and falls off due to the failure of the structural adhesive. The utility model partially grooves the existing concrete column, connects the carbon fiber cloth end to end in the concrete column groove to form a double layer overlap, and then seals it with UHPC to form a carbon fiber layout embedded in the existing concrete, adding an effective connection method between the carbon fiber cloth and the existing concrete column, thereby strengthening the reliability of the reinforced connection between the carbon fiber and the existing concrete column, ensuring the safe service of the existing structural column, and having important significance for improving the seismic toughness of existing buildings.

[0015] 2. Convenient construction and economical cost. Compared with traditional carbon fiber reinforcement, only small-sized local grooving and post-pouring of UHPC are added, but the connection reliability of carbon fiber cloth reinforced existing concrete columns is greatly improved. The overall construction steps are concise and clear, easy to construct, and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the planar structure of an embodiment of the utility model;

[0017] Figure 2 yes Figure 1 AA section structure schematic diagram in;

[0018] Figure 3 It is a front view structural diagram of an embodiment of the utility model;

[0019] Figure 4 It is a rear structural diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0021] The embodiment of the utility model comprises a concrete column 1, a carbon fiber impregnated adhesive 3, a carbon fiber cloth 4 and an ultra-high performance concrete 5.

[0022] The concrete column 1 is an existing concrete column that needs to be reinforced with carbon fiber according to design requirements, and its cross-sectional shape can be rectangular, circular, etc. Concrete column reinforcement 2 is arranged inside the concrete column 1 .

[0023] First, the corrosion and hollowing areas on the surface of the existing concrete column 1 are treated, and a certain column edge is selected for slotting. The concrete column slot 6 is formed from the surface of the concrete column 1 to the surface of the concrete column steel bar 2. The concrete column slot 6 is set along the length direction of the concrete column 1. The vertical length of the concrete column slot 6 is the full length of the concrete column 1. The vertical length of the slotted concrete and the vertical length of the ultra-high performance concrete 5 poured later are the same. The concrete column slot 6 is a trapezoidal shape that is wide outside and narrow inside, and the outer width should not be less than 1 / 5 of the column side length of the concrete column 1 and 100mm. The surface of the concrete column slot 6 is roughened to form a roughened surface, which helps to enhance the bonding effect between the ultra-high performance concrete 5 poured later and the concrete column 1.

[0024] According to the reinforcement width and spacing requirements of the carbon fiber cloth 4 in the reinforcement design, the carbon fiber primer is applied on the surface of the concrete column 1 that needs to be wrapped with the carbon fiber cloth 4, and the surface holes and other parts are repaired and leveled with the primer; after the primer is dry, the carbon fiber impregnation glue 3 is evenly rolled. The carbon fiber impregnation glue 3 is a modified epoxy resin structural glue. During the mixing process, it should be mixed evenly without bubbles; then the cut carbon fiber cloth 4 is pasted to the surface of the concrete column 1 through the carbon fiber impregnation glue 3. On the surface of the concrete column groove 6, the carbon fiber cloth 4 is connected end to end to form a double layer overlap. Finally, a special scraper is used to scrape the surface of the pasted carbon fiber cloth 4 flat and compact it without bubbles. The carbon fiber cloth 4 is made of 12k high-quality raw silk, and the thickness and reinforcement width are based on the design requirements.

[0025] After the carbon fiber cloth 4 is pasted, ultra-high performance concrete 5 is poured into the concrete column groove 6 to seal it. The finished surface of the ultra-high performance concrete 5 should be flush with the surface of the concrete column 1. After the ultra-high performance concrete 5 is solidified and integrated into the concrete column 1, the carbon fiber cloth 4 is partially embedded to form a carbon fiber partially embedded reinforced concrete column structure. Ultra-high performance concrete 5, referred to as UHPC, has excellent mechanical properties and durability.

[0026] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A carbon fiber partially embedded reinforced concrete column structure, comprising a concrete column and a carbon fiber cloth, wherein a carbon fiber primer is applied on the surface of the concrete column to be wrapped with the carbon fiber cloth, a carbon fiber impregnating glue is applied on the carbon fiber primer, and the carbon fiber cloth is adhered to the surface of the concrete column through the carbon fiber impregnating glue; characterized in that: It also includes ultra-high performance concrete; a concrete column groove is opened on the concrete column, and the concrete column groove is arranged along the length direction of the concrete column; on the surface of the concrete column groove, the carbon fiber cloth is connected end to end to form a double layer overlap; the ultra-high performance concrete is poured into the concrete column groove for sealing.

2. The carbon fiber partially embedded reinforced concrete column structure according to claim 1 is characterized in that: The concrete column groove is formed by chiseling from the surface of the concrete column to the surface of the concrete column reinforcement.

3. The carbon fiber partially embedded reinforced concrete column structure according to claim 1 is characterized in that: The vertical length of the concrete column groove is the full length of the concrete column.

4. The carbon fiber partially embedded reinforced concrete column structure according to claim 1 is characterized in that: The concrete column groove is in a trapezoidal shape with a wide outside and a narrow inside.

5. The carbon fiber partially embedded reinforced concrete column structure according to claim 4 is characterized in that: The outer width of the concrete column groove is not less than 1 / 5 of the column side length of the concrete column and is not less than 100 mm.

6. The carbon fiber partially embedded reinforced concrete column structure according to claim 1, characterized in that: The surface of the concrete column groove forms a roughened surface.

7. The carbon fiber partially embedded reinforced concrete column structure according to claim 1, characterized in that: The carbon fiber impregnated adhesive is a modified epoxy resin structural adhesive.

8. The carbon fiber partially embedded reinforced concrete column structure according to claim 1, characterized in that: The finished surface of the ultra-high performance concrete is flush with the surface of the concrete column.

Images