KR100745652B1 - A fiber reinforced plastic pipe with rib - Google Patents

Abstract

In general, pipes for guiding fluid movement in roads, harbors, sewage treatment plants, etc., especially in water and sewage pipes buried in the ground, due to deterioration of durability due to buckling caused by earth pressure at the top of the pipes and corrosion of the inner and outer walls. There are problems such as the inflow of external materials into the water supply pipe, the external outflow of the internal material of the sewer pipe.

In the synthetic resin pipe for guiding the movement of the fluid, such as the upper, sewer pipes, the composition of the present invention, the synthetic resin pipe is fused integrally to the inside and outside of the mortar layer and the mortar layer to perform the function of controlling the deflection, It is formed of a glass fiber reinforced plastic composed of a skin layer into which the glass fiber is inserted to increase the strength of the phosphor, and the synthetic resin tube is formed of a fusion-integrated rib wound around the inner and outer walls and the outer wall formed with a flat surface.

Accordingly, the above-described configuration provides a tube having ribs formed of fiber-reinforced plastics, which is advantageous for buckling, is resistant to corrosion, is easy to install, and can shorten air.

 Mortar Layer, Epidermal Layer, Rib

Description

Ribbed fiber reinforced plastic pipe {A FIBER REINFORCED PLASTIC PIPE WITH RIB}

1 is a side cross-sectional view showing an embodiment of a conventional synthetic resin wave tube embedded with a reinforcement.

2 is a partially cutaway side cross-sectional view of a fiber reinforced plastic tube reinforced with ribs of the present invention.

Figure 3 is an exploded perspective view showing the configuration of the glass fiber reinforced plastic when the fiber reinforced plastic pipe reinforced with ribs of the present invention made of glass fiber reinforced plastic.

Figure 4 is a partially cutaway perspective view of the fiber reinforced plastic tube reinforced with a rib of the present invention.

5 is a perspective view showing a case in which the ribs are configured in a strip shape in a fiber-reinforced plastic tube reinforced with ribs of the present invention.

Figure 6 is a perspective view showing a case in which the rib is configured in a spiral shape in the fiber reinforced plastic pipe reinforced with a rib of the present invention.

＊ Explanation of symbols on main parts of drawing

100 glass fiber reinforced plastic 110 mortar layer

120 Skin Layer 121 Fiberglass

130 ribs

The present invention is a synthetic resin pipe for guiding the movement of fluid, such as water, sewage pipes buried in the ground, the synthetic resin pipe is composed of a fused integral rib wound around the inner and outer walls and the outer wall having a flat surface In addition to improving the resistance to buckling, the synthetic resin tube is composed of a mixture of thermosetting resin and sand, laminated on the inside and outside of the mortar layer and the mortar layer to control the deflection, and to increase the mechanical strength The present invention relates to a synthetic resin pipe that guides the movement of a fluid that is advantageous in corrosion resistance, buckling resistance, and economic efficiency by forming using a glass fiber reinforced plastic composed of a skin layer composed of a thermosetting resin into which glass fibers are inserted.

In general, concrete fume pipes are mainly used as pipes for guiding fluid movement in water and sewage pipes, and concrete fume pipes require heavy equipment input during transportation and handling due to an increase in their weight and volume. The construction period increases due to the increase of the connection part along with the deterioration of workability due to the installation and dismantling of, and there is a problem that the construction is seasonally limited due to the foundation cement connecting the connection part and the freezing of the connection part.

Due to the high external pressure strength, durability, and workability, corrugated steel pipes having convex portions and concave portions formed on the pipe walls using galvanized steel pipe coils have been used. However, when the corrugated steel pipes of the above galvanized steel pipes are used as sewage, waste water pipes, sewage pipes, etc., the corrugated steel pipes are corroded and oxidized due to the toxicity of sewage, waste water, and domestic sewage. Due to the deterioration, sewage, wastewater, etc. inside the pipe were leaked to the outside, resulting in environmental pollution.

In view of the above problems, a method of having a corrosion resistance and oxidation resistance of corrugated steel pipes has been used by coating a predetermined powder on the corrugated steel pipe surface by thermal fusion. However, in the coating method using powder, the thickness of the coating layer laminated on the convex portion and the concave portion of the corrugated steel pipe is different, so the reliability of the product is lowered and the cost of the powder is increased when the thickness of the coating layer is increased. Elevated, there is a problem that a separate coating treatment is cumbersome and delayed air.

Therefore, corrugated pipes made of synthetic resin materials with strong resistance to corrosion were developed. This type of synthetic resin pipes have a long length, so that the number of pipe connection parts is small and relatively flexible, so that the curved pipes can be used. As a result, underground burial work can be drastically shortened, which is why it is widely used in the near future. However, underground buried pipes need to have a pressure resistance to withstand the strong earth pressure, so in order to cope with this, the thickness of the pipe wall must be increased. In this case, a large amount of synthetic resin material is required and transport or pumice work is not easy. .

In order to solve the defects of the synthetic resin pipes as described above, Korean Patent Registration No. 2,931 (Invention: Pressure-resistant synthetic resin pipe for underground laying) has been presented. The main focus is to improve the pressure resistance by embedding the metal foil as a reinforcement in a continuous structure over the entire convex part and both side walls connected to the convex part. Therefore, since a reinforcement such as stainless steel sheet, which is considerably higher in strength than the conventional synthetic resin, is embedded, even if the reinforcement is made of a very thin material, it provides an advantage of having a higher pressure resistance than a corrugated pipe made of only synthetic resin.

However, the synthetic resin tube in which the reinforcement material is inserted as described above is inserted in the state in which both side lateral bent portions of the reinforcement material are spaced apart from each other or simply overlapped with each other, which increases the defective rate when producing the product. Even after construction and after pipe construction, there were cracks and cracks in the synthetic resin corrugation, which were relatively weak in pressure resistance, resulting in reduced safety and service life.

After piping or construction of the product, there was a defect in which the middle portions of the relatively weak corrugated recesses were split and burst when the transverse bending portions of the stiffener were separated from each other by strong earth pressure and deviated from each other. As the bending stress is concentrated at the edge of the direction bending part, the synthetic resin of the corrugated concave part surrounding the crack breaks, and thus there is a problem in that stability is shortened and service life is further reduced when piping in a straight line.

Accordingly, the present invention has been made to solve the problems caused by the prior art, the object of the present invention is to construct a rib on the exterior wall structurally advantageous to the buckling in the pipe buried in the ground, such as water and sewage pipe, It provides a tube made of glass fiber reinforced plastic having excellent corrosion resistance, excellent weight ratio rigidity, and easy construction. In particular, the glass fiber reinforced plastic is formed by mixing a thermosetting resin and sand to control sag. It is structurally excellent because it is composed of a skin layer composed of a thermosetting resin in which glass mortar is fused and integrated on the inside and the outside of the mortar layer to perform a function, and the mechanical strength is enhanced, and the overall tube thickness is increased for strength. It is economical by controlling the insertion amount and direction of glass fiber without adjusting To provide the tube with strength comfortably adjustable glass-fiber-reinforced plastic.

The present invention is a synthetic resin pipe for guiding the movement of fluid, such as water and sewage pipe to achieve the above object, the synthetic resin pipe is composed of fiber reinforced plastic, the synthetic resin pipe is an inner pipe wall and an outer wall to form a flat surface It is composed of a fused integral rib while winding the circumference of the outer wall.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2, 3, 4, 5, and 6.

Figure 2 is a partially cutaway side cross-sectional view of the fiber reinforced plastic tube reinforced with ribs of the present invention, Figure 3 is a configuration of the glass fiber reinforced plastic when the fiber reinforced plastic tube reinforced with ribs of the present invention made of glass fiber reinforced plastic 4 is a partially cutaway perspective view of the fiber-reinforced plastic tube reinforced with ribs of the present invention, and FIG. 5 is a perspective view when the ribs are formed in a band shape in the fiber-reinforced plastic tube reinforced with ribs of the present invention. 6 is a perspective view showing the case where the ribs are formed in a spiral shape in the fiber-reinforced plastic pipe reinforced with the ribs of the present invention.

As described above, the present invention uses a fiber reinforced plastic having excellent resistance to corrosion, excellent weight ratio rigidity, and easy construction as a known material.

The fiber reinforced plastics (hereinafter referred to as "FRP") are also called fiber reinforced resins and reinforced plastics. As the reinforcing material, an aromatic nylon fiber such as glass fiber carbon fiber and kevlar is used, and the glass fiber reinforced FRP is referred to as glass fiber reinforced plastic (hereinafter referred to as "GFRP").

The GFRP is a known material, and its composition is composed of glass fiber, thermosetting resin, and sand, and the ratio of each material can be selectively configured in various ways according to the needs of the user. The thermosetting resin may be unsaturated polyester resin, epoxy resin, vinyl ester resin, or the like.

Unsaturated polyester resins have moderate heat and corrosion resistance compared to other thermosetting resins, but the material price is more economical than other resins. Vinyl ester resins have excellent corrosion resistance and can be selectively used according to construction conditions.

In particular, when the unsaturated polyester resin is reinforced with the glass fiber, it becomes a material having great strength and impact resistance. The unsaturated polyester resin itself has a smaller strength than hard polyvinyl chloride and polymethyl methacrylate, but when reinforced with glass fiber, the strength increases as the content thereof increases.

Therefore, the GFRP has a higher weight ratio stiffness than steel pipes as well as resistance to corrosion, so that the buckling strength is much stronger than that of steel pipes, and the weight to obtain the same strength will be lower than that of steel pipes. Since much longer pipes can be manufactured on site, the connections at the joints will be smaller, and the air can be shortened.

Looking at the configuration of the GFRP 100 in detail, as shown in Figure 3 is composed of a mixture of thermosetting resin and sand mortar layer 110 to perform the function of controlling the deflection; It is laminated on the inside and the outside of the mortar layer 110, and is composed of a skin layer 120 made of a thermosetting resin into which glass fibers 121 are inserted to increase mechanical strength. The resin and the sand are advantageous in terms of the mixing ratio, and the thermosetting resin is advantageous in terms of the sag control, and the sand is economically advantageous. Therefore, it is preferable that the user selectively adjust the ratio as necessary. In addition, in the case of the epidermal layer 120, if the ratio of glass fiber is increased in terms of mechanical strength enhancement, the strength will be enhanced, but it will be disadvantageous in terms of material cost. Therefore, the ratio of thermosetting resin and glass fiber can be adjusted according to the selection. It is preferable.

The material that plays a major role in the epidemiological aspect of the epidermal layer 120 corresponds to the glass fiber 121, the thermosetting resin is fixed to the glass fiber 121, while the load of the other fiber when one glass fiber is broken It is also called a base material to carry out the function of transmitting and providing a smooth surface.

In the case of inserting only one direction in inserting the glass fiber in the base material, the strength is strengthened only in the direction in which the glass fiber is reinforced, and the glass fiber is very weak in the direction not reinforced. Insert perpendicularly in the circumferential direction (x-axis direction) and the axial direction (y-axis direction), and buckling by shear in a diagonal direction may be a problem between the circumferential direction and the axial direction, so 30 ° in the circumferential direction respectively The glass fiber is inserted in the ˜60 ° direction, and the glass fiber 121 is preferably inserted into the skin layer 120 in the four directions.

In addition, in another embodiment of the present invention, since the direction of earth pressure load may vary depending on the construction conditions during underground laying, such as water and sewage pipes, the glass fiber is more inserted and reinforced according to the direction of earth pressure load. It is also possible to control the insertion direction of the glass fiber according to the underground laying conditions.

As seen from the above, the glass fiber plays a major role in the mechanics, so it is not necessary to adjust the thickness of the entire tube according to the working load of the upper part of the tube, and only in the case of the present invention, the insertion amount and insertion direction of the glass fiber It can be adjusted by the simple and can be reduced because the weight of the pipe can be easily installed.

The mortar layer 110 does not perform the function of strengthening the strength mechanically, but by limiting the deflection by adjusting the thickness (D), in the case of water and sewer pipe excessive deflection may cause structural problems in the future. In the domestic sewage facility standards, the allowable deformation amount of the flexible pipe is not to exceed 5%, so in the case of the conventional steel pipe, unlike the conventional case, the deflection is limited by adjusting the overall thickness. By adjusting, it is possible to economically and easily limit the deflection.

The synthetic resin pipe is composed of an inner tube wall (2) and the outer wall (1) forming a flat surface in configuration, the rib 130 is fused integrally while winding around the outer wall (1), the inner tube wall ( 2) is to form a flat surface to reduce the frictional resistance that hinders the flow of the fluid moving inside the pipe portion, the exterior wall (2) is formed in a flat surface so that the ribs around the exterior wall (2) It is to make it easy to integrate fusion while winding.

The rib 130 is integrally fused to wound the outer wall so as to constrain the pipe in the transverse direction, so that the earth, sewage, live load, etc. acting on the upper part of the pipe in the water, sewer pipes, etc. This improves resistance to buckling in question.

As shown in FIG. 5, the ribs 130 may be formed of a plurality of strips 130a while maintaining a predetermined interval around the outer wall, and the gap between the ribs of the strips 130a. It is desirable to adjust according to the working load acting on the upper part of the tube.

In addition, as shown in Figure 6 as another embodiment of the rib 130 can be configured in a spiral shape (130b) while maintaining a constant interval around the outer wall, the rib 130 is a band shape (130a) Since the constraining effect of the tubular portion 130b is superior to that of the constraining, the rib may be configured in a spiral shape when the working load of the upper portion of the tubular portion is large.

The rib 130 is composed of a GFRP like a pipe, but may be composed of a mortar layer and a skin layer fused integrally to the inside and the outside of the mortar layer, such as GFRP constituting the pipe, in this case glass fiber is inserted into the skin layer The direction of may be inserted only in one direction in the longitudinal direction of the rib. Therefore, when the rib is configured in a band shape, only one direction is inserted in the circumferential direction, and when the rib is configured in a spiral shape, only one direction is inserted in the spiral direction.

In addition, the ribs 130 may be made of GFRP like a pipe part, but may be made of only one skin layer without omitting a mortar layer.

Although the above description has been described as an example by the embodiment of the present invention, it is not limited to the above embodiment and those skilled in the art will be able to realize that various changes and modifications can be made without departing from the technical spirit of the present invention. . Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description in the specification but should be defined by the claims.

By the above configuration, the present invention has the following effects.

First, it is easy to maintain and manage corrosion by using GFRP in water and sewage pipes, and it is easy to construct and shorten air because it can be configured as a lightweight pipe.

Second, by configuring the mortar layer in the composition of the GFRP, it is economical and simple to limit the deflection by adjusting only the thickness of the mortar layer, and by constructing the skin layer, the glass fiber of the skin layer is inserted into the thermosetting resin in four directions. Resistance to buckling by shearing in the longitudinal direction as well as in the diagonal direction is improved.

Third, the strength can be adjusted by adjusting the insertion amount, direction of the glass fiber without adjusting the thickness of the whole tube in the strength control of the tube, it is economical, and can reduce the weight.

Fourth, by fusion-integrating the rib in the outer part, the resistance to buckling against the working load of the upper part of the pipe is improved.

Claims (6)

delete delete delete In the synthetic resin pipe for guiding the movement of fluid, such as water and sewage pipe, the synthetic resin pipe is made of fiber-reinforced plastic, the synthetic resin pipe is an inner pipe wall (2) and the outer wall (1), forming a flat surface, the appearance While winding the circumference of the wall (1), characterized in that consisting of the fused integral rib 130, The fiber reinforced plastic is composed of glass fiber reinforced plastic, The glass fiber reinforced plastic is composed of a mixture of thermosetting resin and sand mortar layer 110 to perform the function of controlling the deflection; It is laminated on the inside and the outside of the mortar layer 110, and consists of a skin layer 120 composed of a thermosetting resin in which glass fibers 121 are inserted for enhancing mechanical strength, When the glass fiber 121 is inserted into the skin layer 120, the glass fiber 121 is inserted in four directions, and the glass fiber is inserted in the 30 ° to 60 ° directions in the circumferential direction, the longitudinal direction and the circumferential direction, respectively. Reinforced fiber reinforced plastic pipe. delete delete

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