WO2021003861A1

WO2021003861A1 - Textile-reinforced concrete-steel pipe-frp composite pipe and manufacturing method therefor

Info

Publication number: WO2021003861A1
Application number: PCT/CN2019/109876
Authority: WO
Inventors: 尹世平; 李耀; 王菲; 丛玺; 刘云超
Original assignee: 中国矿业大学
Priority date: 2019-07-10
Filing date: 2019-10-08
Publication date: 2021-01-14
Also published as: AU2019456680A1; CN110319281A; CN110319281B; AU2019456680B2

Abstract

A textile-reinforced concrete-steel pipe-FRP composite pipe, comprising an FRP round pipe (4), a thin-wall steel pipe (2), and textile-reinforced concrete arranged coaxially from the inside to the outside, wherein fine-grained concrete (3) is poured between the FRP round pipe (4) and the thin-wall steel pipe (2), a steel sleeve ring (5) is provided on an outer surface of a connection portion by means of pegs (6), and a seal rubber gasket is provided below the steel sleeve ring (5). The inner layer of the pipe uses a resin fiber-reinforced material, and has the advantages of corrosion resistance, fatigue resistance, and light weight; the formed pipe features a smooth inner wall, no growth of microorganisms, a large water flow amount, and a long service life, such that subsequent maintenance costs are reduced; due to the use of a steel pipe as an interlayer, the composite pipe has a strong pressure bearing capability and high rigidity; the textile-reinforced concrete of the outer layer has a further constraint effect on the internal steel pipe and FRP, thereby further improving the pressure bearing capability and pressure resistance capability of the pipe; in addition, the textile-reinforced concrete has good corrosion resistance and permeability resistance, thereby implementing a long service life of the pipe.

Description

Fabric reinforced concrete-steel pipe-FRP composite pipe and manufacturing method thereof

Technical field

The invention relates to a fabric reinforced concrete-steel pipe-FRP composite pipe and a manufacturing method thereof, and belongs to the technical field of pipe materials.

Background technique

With the continuous development of cities and the continuous improvement of environmental protection requirements, buried water pipelines, drainage and sewage pipelines have been widely used in urban underground pipe networks. The wall of the traditional reinforced concrete pipeline is relatively rough, and it is easy to adhere to the contaminated liquid. Long-term use will reduce the flow area of the pipeline and increase the resistance between the liquids. In addition, concrete pipelines are prone to water seepage, poor airtightness, and corrosion problems during use, and the corrosion method is chronic corrosion, which is not easy to be discovered by inspectors. Another type of stress corrosion cracking is to cause corrosion and tension in the pipeline. It causes cracking when acting simultaneously with stress, which is extremely harmful.

For the composite pipes used, steel pipes are mostly used as the base pipe, and the outer side is wrapped with insulation materials or elastomer materials. However, during the use of this composite pipeline, due to vehicle loads, the buried pipeline may crack due to excessive pressure or increase the cracks of the composite pipeline, which affects the normal use of the pipeline and affects people's daily life. In addition, this kind of pipe is also prone to technical problems such as corrosion problems, poor corrosion resistance, and short service life.

Summary of the invention

Purpose of the invention: In order to overcome the shortcomings in the prior art, the present invention provides a fabric-reinforced concrete-steel-steel-FRP composite pipe and a method for making the same, which has the characteristics of corrosion resistance, strong pressure bearing capacity, and good airtightness. The pipe wall is thin. , Light weight, smooth inner wall, low resistance and convenient construction and easy installation.

Technical solution: In order to achieve the above purpose, the technical solution adopted by the present invention is:

A fabric-reinforced concrete-steel-steel-FRP composite pipe, including FRP round pipes, thin-walled steel pipes, and fabric-reinforced concrete arranged coaxially from inside to outside;

Wherein, the FRP round pipe is formed by winding multiple strands of continuous fibers after treatment with resin material. The two ends of the FRP round pipe are respectively provided with sockets and sockets; one end of the thin-walled steel pipe is shorter than the FRP round pipe, and the other end is longer than the FRP round pipe , And fine-grained concrete is poured between the FRP round pipe and the thin-walled steel pipe; the outer surface of the thin-walled steel pipe is poured with fabric-reinforced concrete with good corrosion resistance and high bearing capacity, and the outer surface of the fabric-reinforced concrete at the interface is set by studs A steel collar, and a sealing rubber gasket is arranged under the steel collar.

Further, the types of resin materials used in the FRP round tube molding process include polyamide resin, polyethylene resin, phenol resin, epoxy resin, and the like.

Further, the winding angle of the fiber yarn in the FRP round tube forming process is ±80° to ±90°.

Further, the types of continuous fibers in the FRP round tube forming process include aramid fibers, carbon fibers, glass fibers, basalt fibers, PBO fibers and hybrid fibers.

Further, the thin-walled steel pipe is a seamless steel pipe.

Further, the fabric-reinforced concrete is composed of fiber woven net and fine-grain concrete.

Further, the types of the fiber woven net include: carbon fiber woven net, glass fiber woven net, PBO fiber woven net, basalt fiber woven net, aramid fiber woven net, and hybrid fiber woven net.

Further, the components in the fine-grained concrete are cement, fly ash, silica fume, quartz sand and water reducing agent, wherein the water-binder ratio is 0.38 to 0.40, and the water reducing agent is 1.5 to 2.5% of the cement mass. , Fly ash is 20% to 25% of the total mass of the cementitious material, silica fume is 5% to 7.5% of the total mass of the cementitious material, and the mass of quartz sand is 1000kg to 1400kg (particle size 0～0.6mm and 0.6～1.2mm) The proportion is 2:1).

Further, the steel collar is fixed to the surface of the steel pipe by stud welding.

A fabric-reinforced concrete-steel-steel-FRP composite pipe manufacturing method includes the following steps:

1) The fiber reinforced composite material-fiber yarn is wound and processed into a corrosion-resistant FRP tube as the inner layer. The FRP tube has sockets and sockets at both ends;

2) According to the design requirements, arrange thin-walled steel pipes on the outside of the FRP pipe. The steel pipe coincides with the central axis of the FRP pipe. One end of the steel pipe is shorter than the FRP pipe, and the other end is longer than the FRP pipe. determine;

3) Pour fine-grained concrete between the FRP round pipe and the thin-walled steel pipe;

4) Set studs at equal intervals on the outer surface of the steel pipe and weld the studs with the steel collar;

5) Pouring fabric-reinforced concrete with good corrosion resistance and high bearing capacity on the outer side of the thin-walled steel pipe, in which the number of layers of the fiber woven net is arranged according to the actual engineering requirements;

6) A sealing rubber gasket is arranged under the steel collar to play a sealing role when the pipeline is assembled.

Beneficial effects: The fabric-reinforced concrete-steel-steel-FRP composite pipe provided by the present invention and the manufacturing method thereof have the following advantages compared with the prior art:

1) Good corrosion resistance. The inner layer of the pipe is made of acid- and alkali-resistant FRP materials, which makes the pipes have a long service life and reduces the maintenance and maintenance costs in the later period. At the same time, it also widens the use channels of the pipes. It can be applied to the transportation of corrosive liquids. In addition, the fabric reinforced concrete The application also avoids the corrosion of the sandwich steel pipe, and further extends the service life of the pipe.

2) Strong pressure bearing capacity. The FRP material has high tensile strength, and the FRP round pipe formed by winding has strong bearing capacity. The steel pipe used in the interlayer also has better bearing capacity. At the same time, the fabric-reinforced concrete of the outer layer has a further restraining effect on the inner steel pipe and FRP. The pipeline rupture is greatly avoided, and the risk of pipeline rupture due to insufficient pressure during use is reduced.

3) Good sealing. The pipe interface is provided with sockets, reserved sockets and steel collars. Multiple measures have greatly improved the sealing performance of the pipes.

4) The pipe wall is thin, light weight, smooth inner wall, low resistance, and convenient construction and easy installation.

Description of the drawings

Figure 1 is a schematic structural diagram of a fabric-reinforced concrete-steel-FRP composite pipe proposed by the present invention;

Figure 2 is a structural view along the A-A direction of Figure 1;

Figure 3 is a structural view of the composite pipe A and composite pipe B at the joint in Figure 2;

The figure includes: 1. Fiber braided mesh, 2. Thin-walled steel pipe, 3. Fine-grained concrete, 4. FRP round pipe, 5. Steel collar, 6. Peg.

Detailed ways

The present invention will be further explained below in conjunction with the drawings.

Figure 1-3 shows a fabric-reinforced concrete-steel-steel-FRP composite pipe, which includes FRP round pipes 4, thin-wall steel pipes 2, and fabric-reinforced concrete arranged coaxially from the inside to the outside;

The FRP round pipe 4 is formed by winding multiple strands of continuous fibers after treatment with resin material, and the two ends of the FRP round pipe 4 are respectively provided with sockets and sockets; one end of the thin-walled steel pipe 2 is shorter than the FRP round pipe 4, and the other end is longer than FRP round pipe 4, and fine-grained concrete 3 is poured between FRP round pipe 4 and thin-walled steel pipe 2; the outer surface of the fabric-reinforced concrete at the interface is provided with a steel collar 5 through studs 6, and the steel collar 5 There is a sealing rubber pad underneath.

The types of resin materials used in the forming process of the FRP round tube 4 include polyamide resin, polyethylene resin, phenol resin, epoxy resin, and the like.

The continuous fiber types used in the forming process of the FRP round tube 4 include aramid fiber, carbon fiber, glass fiber, basalt fiber, PBO fiber and hybrid fiber, and the winding angle of the fiber yarn is ±80°～±90°.

The thin-walled steel pipe 2 is a seamless steel pipe; the steel collar 5 is welded and fixed to the surface of the steel pipe by studs 6.

The fabric-reinforced concrete is composed of a fiber woven net 1 and a fine-grained concrete 3. The types of the fiber woven net 1 include carbon fiber woven net, glass fiber woven net, PBO fiber woven net, basalt fiber woven net, and aramid fiber woven net , Hybrid fiber woven mesh.

The components of the fine-grained concrete 3 are cement, fly ash, silica fume, quartz sand and water reducer, wherein the water-binder ratio is 0.38-0.40, and the water-reducing agent is 1.5-2.5% of the cement mass. Coal ash is 20% to 25% of the total mass of cementitious materials, silica fume is 5% to 7.5% of the total mass of cementitious materials, and the mass of quartz sand is 1000kg to 1400kg (the specific gravity of the particle size is 0-0.6mm and 0.6-1.2mm) 2:1).

1) The fiber reinforced composite material-fiber yarn is wound and processed into a corrosion-resistant FRP tube as the inner layer, and the two ends of the FRP tube have sockets and sockets;

2) Arrange thin-walled steel pipes on the outside of the FRP pipe according to the design requirements. The steel pipe coincides with the central axis of the FRP pipe. One end of the steel pipe is shorter than the FRP pipe and the other end is longer than the FRP pipe. The values of shortening and elongation at both ends of the steel pipe are determined according to engineering requirements;

3) Fine-grain concrete is used for pouring between FRP pipe and thin-wall steel pipe;

In the present invention, the inner layer of the pipe is made of resin fiber reinforced material, which has the advantages of corrosion resistance, fatigue resistance, light weight, etc. The inner wall of the formed pipe is smooth, does not grow microorganisms, has a large water flow, and has a long service life, which reduces the maintenance cost in the later period. ; Due to the use of steel pipes in the middle interlayer, the new composite pipe proposed by the present invention has higher pressure bearing capacity and greater rigidity; the fabric-reinforced concrete of the outer layer has a further restraining effect on the inner steel pipe and FRP, making the pipe support The compressive capacity and compressive capacity are further enhanced, and the fabric-reinforced concrete has good corrosion resistance and impermeability, which makes the service life of the pipe longer. In addition, by arranging sockets, reserved sockets and using steel collars at the pipe interface, the sealing performance of the pipe is significantly improved.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims

A fabric-reinforced concrete-steel-steel-FRP composite pipe, which is characterized by comprising FRP round pipes (4), thin-walled steel pipes (2) and fabric-reinforced concrete arranged coaxially from the inside to the outside;

The FRP round pipe (4) is formed by winding multiple strands of continuous fibers after treatment with resin material, and the FRP round pipe (4) has sockets and sockets at both ends; one end of the thin-walled steel pipe (2) is shorter than the FRP round The other end of the pipe (4) is longer than the FRP round pipe (4), and fine-grain concrete (3) is poured between the FRP round pipe (4) and the thin-walled steel pipe (2); the outer surface of the fabric reinforced concrete at the interface A steel collar (5) is provided through the stud (6), and a sealing rubber gasket is provided under the steel collar (5).
The fabric-reinforced concrete-steel-steel-FRP composite pipe according to claim 1, wherein the type of resin material used in the molding process of the FRP round pipe (4) includes polyamide resin, polyethylene resin, and phenolic resin And epoxy.
The fabric-reinforced concrete-steel-FRP composite pipe according to claim 1, wherein the winding angle of the fiber yarn in the forming process of the FRP round pipe (4) is ±80°-±90°.
The fabric-reinforced concrete-steel-FRP composite pipe according to claim 1, wherein the continuous fiber types used in the forming process of the FRP round pipe (4) include aramid fiber, carbon fiber, glass fiber, basalt Fiber, PBO fiber and hybrid fiber.
The fabric-reinforced concrete-steel-steel-FRP composite pipe according to claim 1, wherein the thin-walled steel pipe (2) is a seamless steel pipe.
The fabric-reinforced concrete-steel-steel-FRP composite pipe according to claim 1, wherein the fabric-reinforced concrete is composed of fiber woven mesh (1) and fine-grained concrete (3).
The fabric-reinforced concrete-steel pipe-FRP composite pipe according to claim 6, wherein the types of the fiber woven net (1) include carbon fiber woven net, glass fiber woven net, PBO fiber woven net, basalt fiber Woven net, aramid fiber woven net, mixed fiber woven net.
The fabric-reinforced concrete-steel-steel-FRP composite pipe according to claim 6, wherein the components of the fine-grained concrete (3) include cement, fly ash, silica fume, quartz sand and water reducing The water-binder ratio is 0.38～0.40, the water reducing agent is 1.5～2.5% of the cement mass, fly ash is 20%-25% of the total mass of the cementing material, and silica fume is 5% of the total mass of the cement ~7.5%, the mass of quartz sand is 1000kg~1400kg.
The fabric-reinforced concrete-steel-steel-FRP composite pipe according to claim 1, wherein the steel collar (5) is welded and fixed to the surface of the steel pipe by studs (6).
A manufacturing method of fabric-reinforced concrete-steel-steel-FRP composite pipe is characterized in that it comprises the following steps:

1) The fiber reinforced composite material-fiber yarn is wound into an FRP tube (4) as the inner layer, and the FRP tube (4) has sockets and sockets at both ends;

2) Arrange the thin-walled steel pipe (2) outside of the FRP round pipe (4), the thin-walled steel pipe (2) and the FRP round pipe (4) coincide with the central axis, one end of the thin-walled steel pipe (2) is shorter than the FRP round pipe (4) , The other end is longer than the FRP round tube (4);

3) Pouring fine-grained concrete (3) between the FRP round pipe (4) and the thin-walled steel pipe (2);

4) On the outer surface of the thin-walled steel pipe (2), studs (6) are arranged circumferentially and equidistantly, and a steel collar (5) is welded on the outside of the studs (6);

5) Pouring fabric-reinforced concrete on the outside of the thin-walled steel pipe (2);

6) Arrange a sealing rubber gasket inside the steel collar (5).