CN215721344U

CN215721344U - Hollow structure wall thermosetting composite material pipeline with high interlayer shear strength

Info

Publication number: CN215721344U
Application number: CN202121489400.5U
Authority: CN
Inventors: 何军; 朱四荣
Original assignee: Hangzhou Tanke Machinery Technology Co ltd
Current assignee: Hangzhou Tanke Machinery Technology Co ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2022-02-01
Anticipated expiration: 2031-07-01

Abstract

The utility model discloses a hollow structure wall thermosetting composite material pipeline with high interlayer shear strength, which comprises an inner solid wall, an outer solid wall and interlayer long fibers, wherein the inner solid wall and the outer solid wall are connected by radial upright ribs; on the axial section, interlaminar long fibers are compounded on the inner solid wall, the upright ribs, the outer solid wall and the upright ribs in an S shape in sequence; the interlayer long fiber is made of glass fiber, basalt fiber or carbon fiber. The utility model has the beneficial effects that: interlaminar fibers are added to the traditional laminated structure to significantly improve interlaminar shear performance.

Description

Hollow structure wall thermosetting composite material pipeline with high interlayer shear strength

Technical Field

The utility model relates to the field of pipe making, in particular to a hollow structure wall thermosetting composite material pipeline with high interlayer shear strength.

Background

Chinese patent document CN111022781A discloses "a hollow wall structure fiber reinforced plastic pipeline and a manufacturing process thereof" in 2020, 4/7, the hollow wall structure fiber reinforced plastic pipeline at least includes two solid wall layers, an inner solid wall layer and an outer solid wall layer, a hollow layer is disposed between two adjacent solid wall layers, and the hollow layer includes a hard hollow pipe wound in the circumferential direction of the inner solid wall layer. On the basis, the utility model also discloses a manufacturing process of the glass fiber reinforced plastic pipeline with the hollow wall structure, which comprises the following steps: manufacturing the innermost solid wall layer, winding the hollow pipe, filling and winding resin fiber materials, manufacturing the outer solid wall layer, curing and cutting. The utility model has the beneficial effects that: has the advantages of light weight, high strength and convenient manufacture, and is beneficial to the popularization of advanced technology. For the glass fiber reinforced plastic hollow structure wall pipe, the pipe wall structure determines the non-uniform distribution of internal stress, and the continuously wound pipe has poor interlayer shearing performance due to clear interlayer interfaces. When the radial compression generates deformation, the vertical ribs bear interlayer shear stress far larger than that of the internal solid wall layer and the external solid wall layer, and interlayer shear damage is easy to generate. Typical failure modes resulting from interlaminar shear failure include interlaminar separation, unrecoverable bulging due to compression, unrecoverable denting or fracture due to tension, deformation due to inelastic deformation, and the like, according to the teachings of GB/T30969-2014 Polymer matrix composite short Beam shear Strength test method. When these phenomena occur, it is proved that the sealing function of the glass fiber reinforced plastic hollow structural wall pipe is likely to be lost, and the function of transferring fluid is rapidly lost, and the life of the pipe is about to end. For municipal pipelines buried in the ground, the load above and the soil erosion below are long-term potential factors that cause the pipeline to be subjected to radial shear forces. The applicant believes that there is a need for an improved design for existing hollow wall thermoset composite pipes to improve the interlaminar shear strength and extend the useful life of the pipe.

Disclosure of Invention

Based on the problems, the utility model provides a hollow structure wall thermosetting composite material pipeline with high interlayer shear strength, and interlayer fibers are added to the traditional laminated structure so as to obviously improve the interlayer shear performance.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: a hollow structure wall thermosetting composite material pipeline with high interlayer shear strength comprises an inner solid wall and an outer solid wall, wherein the inner solid wall and the outer solid wall are connected by radial upright ribs; on the axial section, interlaminar long fibers are compounded on the inner solid wall, the upright ribs, the outer solid wall and the upright ribs in an S shape in sequence; the interlayer long fiber is made of glass fiber, basalt fiber or carbon fiber.

Preferably, the interlayer long fibers are uniformly and densely distributed in the circumferential direction of the pipe wall.

Preferably, the ratio of the using amount of the interlayer long fibers to the circumference of the pipe wall ranges from 50 to 400 fibers/m.

Preferably, the fabric further comprises interlayer short fibers; the interlayer short fibers are randomly compounded on the inner solid wall, the outer solid wall and the upright ribs; the interlayer short fibers are made of glass fibers, basalt fibers or carbon fibers.

Preferably, the length of the interlayer short fibers is 10 to 100 mm.

Preferably, the interlaminar short fibers are used in an amount of not less than 5% by mass of the total mass of the upstanding ribs.

The hollow structure wall thermosetting composite material pipeline with high shearing strength designed by the technical scheme is provided with an inner solid wall on the inner side and an outer solid wall on the outer side, and the inner solid wall and the outer solid wall are connected by using the vertical ribs, so that a hollow composite pipe wall structure is formed. In this construction, the standing ribs serve as a connection and support for the inner and outer solid walls and are of decisive significance for the formation of the hollow structure. However, the thermosetting composite material pipe (typically made of glass fiber reinforced plastic) is still made by winding in layers during preparation, which determines that the vertical ribs are still wound in a lamination way in terms of structure, and when the vertical ribs are stressed in a radial direction, the interlaminar shear stress of the vertical ribs is far greater than that of the inner solid wall and the outer solid wall. Therefore, the scheme adds interlayer long fibers as a reinforced structure when the pipeline is prepared in a composite mode. The material of the interlayer long fiber can be glass fiber, basalt fiber or carbon fiber, and also can be other artificial fiber or natural fiber with similar physical properties. Common glass fibers and basalt fibers, such as 1200TEX, 2400TEX, 4800TEX, 9600TEX, etc., and small tows and large tows of carbon fibers can be used. The interlaminar long fibers are continuous fibers, and the length can reach hundreds of meters and thousands of meters. The interlaminar long fibers are bent into an S shape, are sequentially compounded on the inner solid wall, the upright ribs, the outer solid wall and the upright ribs, and are continuously repeated from head to tail in the axial direction of the pipe wall. In the scheme, one part of the same interlayer long fiber extends along the radial direction and the other part of the same interlayer long fiber extends along the axial direction, the adjacent inner solid wall, the adjacent vertical ribs and the adjacent outer solid wall can be organically connected in the axial direction and the radial direction, and when the interlayer long fiber is subjected to radial pressure, the stress can be decomposed to the adjacent region through the interlayer long fiber, so that the stress resisting effect of a stress point is remarkably improved. The interlayer long fibers are uniformly and densely distributed in the circumferential direction of the pipe wall, so that the stress short plate can be eliminated. Aiming at different stress requirements, different numbers of interlayer long fibers can be arranged in the circumference of the pipe wall at a unit distance.

Furthermore, the interlaminar short fibers can be randomly compounded on the inner solid wall, the upright ribs and the outer solid wall. The interlayer short fiber is made of glass fiber, basalt fiber or carbon fiber, and also can be other artificial fiber or natural fiber with similar physical properties. The length range is controlled to be 10-100 mm. The using amount is not less than 5 percent of the total mass of the upright ribs in mass ratio. The interlayer short fibers can be mixed in the resin, are coated between layers after being fully dispersed, can obviously improve the tensile resistance in all directions after composite curing, and has good auxiliary effect on improving the shearing resistance of the vertical ribs and the connection strength among the inner solid wall, the vertical ribs and the outer solid wall.

In conclusion, the beneficial effects of the utility model are as follows: interlaminar fibers are added to the traditional laminated structure to significantly improve interlaminar shear performance.

Drawings

Fig. 1 is a cross-sectional view of the present invention.

Wherein: 1 inner solid wall, 2 outer solid wall, 3 upright ribs, 4 layers of long fibers and 5 layers of short fibers.

Detailed Description

The utility model is further described with reference to the following detailed description and accompanying drawings.

An embodiment is a hollow structural wall thermoset composite pipe with high interlaminar shear strength.

Referring to fig. 1, the high-interlayer shear strength hollow structural wall thermosetting composite material pipe of the present embodiment includes an inner solid wall 1 on the inner side, an outer solid wall 2 on the outer side, and upright ribs 3 extending in the radial direction between the inner solid wall 1 and the outer solid wall 2. The inner solid wall 1 and the outer solid wall 2 and the upstanding ribs 3 are prepared in a manner as disclosed in chinese patent document CN 111022781A.

In this example, the interlaminar long fibers 4 and the interlaminar short fibers 5 are added as structural reinforcements.

The interlaminar long fibers 4 are continuous fibers, and the material of the interlaminar long fibers in this example is glass fibers of 2400TEX standard. In an axial section, the interlaminar long fibers 4 are bent into an S-shape, are sequentially compounded on the inner solid wall 1, the upstanding ribs 3, the outer solid wall 2 and the upstanding ribs 3, and are continuously repeated from head to tail in the axial direction of the pipe wall. In the circumferential direction of the pipe wall, the interlayer long fibers 4 are uniformly and densely distributed, and 220 are arranged on the average per one meter of the circumference of the pipe wall. When the interlayer long fibers 4 are compounded, a method of winding two hollow tube forming dies in parallel is adopted. One of the two layers of long fibers 4 is pressed on the inner side during winding, the other layer of long fibers 4 is exposed on the outer side during winding, and the other layer of long fibers is pressed on the inner side and the other layer of long fibers is pressed on the outer side continuously until the end of the pipe is wound. And then carrying out composite curing.

The length of the interlayer short fiber 5 is 10-100 mm, 15mm is selected in the embodiment, and the material is also glass fiber with 2400TEX standard. The interlayer short fibers 5 are uniformly mixed into the resin, and the resin is coated outside each layer of the resin fiber material and then compositely cured in the pipe manufacturing process. The amount of the interlaminar short fibers 5 used is not less than 5% by mass of the total mass of the upstanding ribs 3, in this example about 16%.

The hollow structure wall thermosetting composite material pipeline with high interlaminar shear strength of the embodiment is formed by compounding the interlaminar long fibers 4 and the interlaminar short fibers 5, the interlaminar long fibers 4 remarkably improve the interlaminar shear performance, and the interlaminar short fibers 5 remarkably improve the tensile resistance in all directions.

Claims

1. A hollow structure wall thermosetting composite material pipeline with high interlayer shear strength comprises an inner solid wall (1) and an outer solid wall (2), wherein the inner solid wall (1) and the outer solid wall (2) are connected by radial vertical ribs (3), and the pipeline is characterized by further comprising interlayer long fibers (4), wherein the interlayer long fibers (4) are continuous fibers; on the axial section, the interlayer long fibers (4) are compounded on the inner solid wall (1), the vertical ribs (3), the outer solid wall (2) and the vertical ribs (3) in an S shape in sequence; the material of the interlayer long fiber (4) is glass fiber, basalt fiber or carbon fiber.

2. The high interlaminar shear strength hollow structural wall thermoset composite pipe of claim 1, wherein the interlaminar long fibers (4) are uniformly dense in the circumferential direction of the pipe wall.

3. The pipe of claim 2, wherein the ratio of the amount of the interlaminar long fibers (4) to the circumference of the pipe wall is in the range of 50 to 400 filaments/m.

4. A high interlaminar shear strength hollow structural wall thermoset composite pipe as claimed in claim 1 or 2 or 3, characterized by further comprising interlaminar short fibers (5); the interlayer short fibers (5) are randomly compounded on the inner solid wall (1), the outer solid wall (2) and the upright ribs (3); the interlayer short fibers (5) are made of glass fibers, basalt fibers or carbon fibers.

5. The high interlaminar shear strength hollow structural wall thermoset composite pipe of claim 4, characterized in that the length of the interlaminar staple fibers (5) is in the range of 10 to 100 mm.

6. The pipe of claim 4, wherein the interlaminar short fibers (5) are used in an amount of not less than 5% by mass based on the total mass of the vertical ribs (3).