FRP (Fiber Reinforce Plastic) profile-steel bar composite pipe

Abstract

The utility model discloses a fiber reinforced plastic (FRP) section-steel bar composite pipe, which belongs to the technical field of building engineering construction and comprises a plurality of annular FRP strips soaked with adhesive materials, and the annular FRP strips are arranged along one direction at fixed distances. The annular FRP strip is provided with a plurality of wrapping cavities used for wrapping the reinforcing steel bars, the wrapping cavities wrapping the same reinforcing steel bar correspond to each other, and the inner walls of the wrapping cavities are in tight contact with the outer walls of the reinforcing steel bars; and the outer sides of the plurality of annular FRP strips are coated with outer FRP cloth. The annular FRP strips play the role of stirrups and are used for fixing the steel bars, the problem of corrosion of the steel bars in a reinforced concrete structure is effectively solved, the durability and safety of the concrete structure are improved, compared with a traditional steel pipe FRP composite pipe, the annular FRP strips have the advantages that the surface of the inner pipe is rougher, the interface bonding capacity of concrete and the composite pipe is higher, and the service life of the composite pipe is prolonged. The stability of the component is improved, steel is saved, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of building engineering construction, and particularly relates to an FRP profile-steel composite pipe. Background Art

[0002] Reinforced concrete structures are widely used in construction and infrastructure projects. Rebar is favored due to its high strength and excellent mechanical properties, however, rebar is susceptible to corrosion under some environmental conditions, such as humid environments, chemical exposure, and high-salinity marine environments. Rebar corrosion can easily lead to weakening and damage of the structure, which poses a threat to the safety and durability of buildings. Traditional anti-corrosion methods include surface coatings and anti-corrosion treatments, but these methods may not always be effective or long-lasting. Therefore, it has become crucial to find a new and more reliable way to prevent steel corrosion.

[0003] As an emerging building material, fiber reinforced polymer (FRP) has the advantages of strong corrosion resistance, light weight and high strength, excellent designability and high stability. The composite structure of FRP and steel can effectively avoid the corrosion of steel and the influence of poor ductility of FRP, which is in line with the development direction of future engineering structures. Although the traditional steel tube FRP composite structure has good performance, the use of steel is large, resulting in a certain amount of waste. At the same time, the stirrups are at the outer edge of the cross section of the component, which is more susceptible to erosion, further causing the corrosion of the longitudinal reinforcement, posing a threat to the safety and durability of the component.

[0004] Therefore, an FRP profile-steel composite pipe is proposed to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a FRP profile-steel composite pipe to solve the above problems.

[0006] To achieve the above purpose, the utility model provides the following solutions:

[0007] An FRP profile-steel composite pipe, comprising:

[0008] A plurality of annular FRP strips soaked in adhesive material, wherein the plurality of annular FRP strips are arranged at a fixed distance along a direction;

[0009] The annular FRP strip is provided with a plurality of covering cavities for covering the steel bars, the covering cavities covering the same steel bars correspond to each other, and the inner wall of the covering cavity is in close contact with the outer wall of the steel bars;

[0010] The outer sides of the plurality of annular FRP strips are covered with an outer FRP cloth.

[0011] Preferably, the plurality of steel bars are arranged at equal intervals along the circumference of the steel bar composite pipe.

[0012] Preferably, the width of the annular FRP strip along the axial direction of the steel composite pipe is not greater than 30 mm, and the thickness of the annular FRP strip is not less than 4 mm.

[0013] Preferably, the steel bar is at least one of a plain round steel bar and a ribbed steel bar.

[0014] Preferably, the hoop FRP strips are carbon fibers.

[0015] Preferably, the outer covering FRP cloth is carbon fiber.

[0016] Preferably, the adhesive material is a thermosetting resin matrix.

[0017] Preferably, the thermosetting resin matrix is ​​one of epoxy resin or vinyl resin.

[0018] A FRP profile-steel composite pipe, wherein the cross-sectional shape of the steel bar composite pipe is one of circular, rectangular or elliptical.

[0019] An FRP profile-steel composite pipe, wherein the ends of a plurality of steel bar composite pipes are overlapped by the steel bars and sleeved with steel sleeves for connection and extension.

[0020] Compared with the prior art, the utility model has the following advantages and technical effects:

[0021] The utility model uses the annular FRP strip to play the role of stirrups to fix steel bars, effectively avoiding the problem of steel bar corrosion in reinforced concrete structures, improving the durability and safety of concrete structures, and is particularly suitable for component facilities in corrosive environments, which can avoid economic losses caused by steel bar corrosion. Compared with traditional steel pipe FRP composite pipes, the annular FRP strip has a rougher inner pipe surface, which makes the interface bonding ability between concrete and composite pipe stronger, improves the stability of components, saves steel, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor:

[0023] Figure 1 This is a usage status diagram of Example 1;

[0024] Figure 2 for Figure 1A top view of

[0025] Figure 3 It is a structural schematic diagram of Example 1;

[0026] Figure 4 It is a partial structural schematic diagram of Example 2;

[0027] Figure 5 This is a usage status diagram of Example 2;

[0028] Reference numerals: 1. Circumferential FRP strip; 2. Steel bar; 3. Outer FRP cloth; 4. Steel sleeve; 5. Coating cavity. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1-5 As shown, the utility model discloses an FRP profile-steel composite pipe, comprising:

[0032] A plurality of annular FRP strips 1 soaked in adhesive material, wherein the plurality of annular FRP strips 1 are arranged at a fixed distance along a direction;

[0033] A plurality of covering cavities 5 for covering the steel bars 2 are provided on the annular FRP strip 1. The covering cavities 5 covering the same steel bars 2 correspond to each other, and the inner wall of the covering cavity 5 is in close contact with the outer wall of the steel bars 2.

[0034] The covering cavity 5 opened on the annular FRP strip 1 completely covers the steel bar 2 .

[0035] The outer sides of the plurality of annular FRP strips 1 are covered with an outer FRP cloth 3 .

[0036] According to a further optimized solution, a plurality of steel bars 2 are arranged at equal intervals along the circumference of the steel bar composite pipe.

[0037] The composite pipe of the utility model can be customized to different lengths, and the steel bars 2 can be overlapped and extended to form the composite pipe through the steel sleeve 4.

[0038] According to a further optimization scheme, the width of the annular FRP strip 1 along the axial direction of the steel composite pipe is not greater than 30 mm, and the thickness of the annular FRP strip 1 is not less than 4 mm.

[0039] According to a further optimization scheme, the steel bar 2 is at least one of a plain round steel bar and a ribbed steel bar.

[0040] According to a further optimization scheme, the annular FRP strip 1 is at least one of carbon fiber, glass fiber, basalt fiber and aramid fiber.

[0041] According to a further optimization scheme, the outer FRP cloth 3 is at least one of carbon fiber, glass fiber, basalt fiber and aramid fiber.

[0042] According to a further optimization scheme, the adhesive material is a thermosetting resin matrix.

[0043] According to a further optimization scheme, the thermosetting resin matrix is ​​one of epoxy resin or vinyl resin.

[0044] The installation steps of this utility model are as follows:

[0045] S1, selecting a plurality of steel bars 2 and FRP strips of appropriate size;

[0046] S2, placing the FRP strip into the impregnation tank, adding resin, and fully impregnating the FRP strip;

[0047] S3, weaving the impregnated FRP strips to form a circumferential FRP strip 1 to fix the position of the steel bar 2;

[0048] S4, wrapping the soaked outer FRP cloth 3 around the surface of the tube;

[0049] S5. Place the completed composite pipe into a high-temperature curing furnace for curing.

[0050] Embodiment 1:

[0051] Reference Figures 1 to 3 As shown, the steel bar 2 of this embodiment is a plain round steel bar, and the cross-sectional shape of the steel bar composite pipe for installing the steel bar group is circular.

[0052] Embodiment 2:

[0053] Reference Figure 4-Figure 5 As shown, the steel bar 2 of this embodiment is a plain round steel bar, and the cross-sectional shape of the steel bar composite pipe for installing the steel bar group is a rectangle.

[0054] The utility model is applicable to FRP steel bar composite pipes of different diameters, different cross-sectional shapes and different lengths, can be overlapped, and strips of different numbers and different FRP types can be selected as materials. The utility model has simple operation, reasonable structural design, efficient and fast preparation, low price and high connection quality.

[0055] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A FRP profile-steel composite pipe, characterized in that: include: A plurality of annular FRP strips (1) soaked in adhesive material, wherein the plurality of annular FRP strips (1) are arranged at a fixed distance along a direction; The annular FRP strip (1) is provided with a plurality of wrapping cavities (5) for wrapping the steel bars (2), the wrapping cavities (5) wrapping the same steel bars (2) correspond to each other, and the inner wall of the wrapping cavity (5) is in close contact with the outer wall of the steel bars (2); The outer sides of the plurality of annular FRP strips (1) are coated with an outer FRP cloth (3).

2. The FRP profile-steel composite pipe according to claim 1, characterized in that: A plurality of the steel bars (2) are arranged at equal intervals along the circumference of the steel bar composite pipe.

3. The FRP profile-steel composite pipe according to claim 1, characterized in that: The width of the annular FRP strip (1) along the axial direction of the steel composite pipe is not greater than 30 mm, and the thickness of the annular FRP strip (1) is not less than 4 mm.

4. The FRP profile-steel composite pipe according to claim 1, characterized in that: The steel bar (2) is at least one of a plain round steel bar and a ribbed steel bar.

5. The FRP profile-steel composite pipe according to claim 1, characterized in that: The hoop FRP strip (1) is carbon fiber.

6. The FRP profile-steel composite pipe according to claim 1, characterized in that: The outer covering FRP cloth (3) is carbon fiber.

7. The FRP profile-steel composite pipe according to claim 1, characterized in that: The adhesive material is a thermosetting resin matrix.

8. The FRP profile-steel composite pipe according to claim 7, characterized in that: The thermosetting resin matrix is ​​one of epoxy resin and vinyl resin.

9. An FRP profile-steel composite pipe according to any one of claims 1 to 8, characterized in that: The cross-sectional shape of the steel bar composite pipe is one of circular, rectangular or elliptical.

10. An FRP profile-steel composite pipe according to any one of claims 1 to 8, characterized in that: The ends of the plurality of steel bar composite pipes are overlapped by the steel bars (2) and sleeved with steel sleeves (4) to be connected and extended.

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