Method of Manufacturing Double-Walled Plastic Pipe

专利摘要:
The present invention uses an anisotropic material with a small amount of material, which increases strength as well as stiffness, can bear a large load even with a small cross section, has sufficient safety against strength, and sag criteria. It is to provide a synthetic resin pipe which is reasonably and economically dynamic. Features of the technical construction of the present invention; The glass-fiber mat or woven roving, which rotates the workbench on a large cylindrical workbench, is laminated in multiple layers using a rotating device and laid up with a wet resin. Manufacture of composite large composite resin tubes with cores made of square tubes made by laying up the inner skin part of a large tube in multiple layers by lamination or filament winding Way.
公开号:KR20020004602A
申请号:KR1020000038662
申请日:2000-07-06
公开日:2002-01-16
发明作者:장석윤
申请人:장석윤；
IPC主号:

专利说明:

Method for manufacturing composite large synthetic resin tube having a core composed of square tubes {Method of Manufacturing Double-Walled Plastic Pipe}
[3] Currently, large pipes used in industrial facilities and water and sewage systems include reinforced concrete fume pipes, box-type reinforced concrete pipes, large steel pipes, and corrugate type steel pipes, and polyethylene pipes are used for small pipes. The honeycomb type double-walled synthetic resin pipe used in Japanese Utility Model Publication 61-173887 is used. These tubes are selectively used in consideration of the mechanical properties, uses, fabrication and economics of the material.
[4] Due to the rapid industrial development, the sewage pipes with various components and types of waste water and the amount of waste water are increasing every day need large sewage pipes such as reinforced concrete fume pipes and box-type concrete pipes due to severe corrosion effects.
[5] The injection-type polyethylene tube currently used has a low strength of the material and a very low elasticity module that affects the deflection. Therefore, even though it is designed to have a honeycomb core, it is rigid. Since this is very small, it can not be used as a large pipe because it can not satisfy the limitation of deflection.
[6] In addition, a double wall injection-type synthetic resin tube having a longitudinal reinforcement rib in the core presented in Japanese Utility Model Publication No. 61-173887 as a small tube is also applied to a large tube because it uses only a single material. However, the thickness of the pipe is increased and the cross section becomes very large, and it is impossible to manufacture the fabrication, which results in a very large deflection, which is not only economical but also lacks safety and cannot be used.
[7] The present invention uses an anisotropic material with a small amount of material, which increases strength as well as stiffness, can bear a large load even with a small cross section, has sufficient safety against strength, and sag criteria. It is intended to be a reasonable and economical structure.
[1] 1 to 5 show a synthetic resin tube produced according to the present invention
[2] 6 to 8 show a method of connecting the synthetic resin pipe of the present invention
[8] The anisotropic structure proposed in the present invention is a material having a large modulus of elasticity so as to have sufficient rigidity in a direction in which the rigidity is increased and geometrically different from each other in the circumferential direction and the longitudinal direction of the tube. Orthogonal anisotropic structures arranged in the direction that the geometric shapes are orthogonal are constructed to improve the mechanical efficiency than the structures made of the same material.
[9] In the special case, such as the pressure tube, the elastic modulus is arranged in an arbitrary direction so as to be an anisotropic structure in which materials are disposed in an optimally dynamic direction.
[10] The fabrication method of such a structure is made by laminating a glass-fiber mat or woven roving in multiple layers using a rotating device on a large cylindrical workbench and using a wet resin. In the process of laying up by lamination or laminating by filament winding, the inner skin part of a large tube may be laid up in multiple layers.
[11] The core material used here is a triangular or square tube of a formulation. A tube of a cross section having a thickness determined by a specification determined by the geometric conditions of a large tube and the physical and mechanical properties of the material. It is a square tube made of composite material manufactured by Pultrusion method by the length determined. Resin material is processed by Continuous Pultrusion method of epoxy or polyester etc. It is a composite material manufactured by coagulation. As shown in FIG. 1, the processed materials are superimposed to form core parts.
[12] When overlapping to form a circle as shown in Figure 1 is formed using an adhesive. After overlapping, the skin of the outer part can be laminated with glass fiber mat or woven roving in the same way as the inner side, or chopped strand mat and synthetic resin. The skin is fabricated into a multilayer so that the skin is symmetrical about the central axis of the inner and outer laminates.
[13] The glass fiber mat is continuous but the chopped strand mat is molded using a thermo-plastic resin and the woven roving is a fabric form. In addition, after the wearing by glass fiber roving (glass fiber roving) to be manufactured.
[14] In the case of a very large tube, the core tube is designed as a synthetic resin tube with a double layer of core tube to reinforce the core part. As shown in FIG. Can be.
[15] Tubes having a core composed of large rectangular tubes of such composites have very good structural dynamics. At this time, the fiber direction is arranged in the circumferential direction so that the inner and outer skin materials are formed in the circumferential direction so that the value of the resistance bending moment in the circumferential direction is increased. In some cases, when the pressure tube is manufactured, reinforcement in the direction of the tube axis is required, so the tube of the core part should be manufactured to have a large resistance axial force and rigidity in the longitudinal direction by reinforcing with an appropriate fiber. do.
[16] When the structural performance of the composite material is selectively compared by dividing the structure of the tube into two parts, in general, the fiber glass-polyester composite varies depending on the ratio of components, but the strength is usually 20 to 30ksi and elastic modulus (E) is 0.8 ~ 1.5 × 10 ⁶ psi, which is economical and inexpensive. When the resin is vinyl ester, the tensile strength is excellent and the elongation is high. Fiber glass-epoxy composite has excellent strength and elastic modulus and is excellent as a structural material. When mechanically demanding high strength and high modulus of stiffness are required, carbon fiber-epoxy composites are selected from the composite structure, which would be a very good or economically expensive structure. .
[17] In the case of core material, fiberglass-polyester or fiberglass-epoxy composite may be selectively used. Generally, fiberglass-polyester composite is used. In the case of a stable high-strength structural material, fiber glass-epoxy may be used. Of course, considering economics and manufacturability, it is possible to selectively design and manufacture by selecting a thermoplastic process or a thermo-set process.
[18] In the case of general sewage pipes, not pressure pipes, the resistance moment in the circumferential direction is largely dominated, so that the stiffness in the circumferential direction becomes large, and the axial stiffness {A} _ {ij} becomes a small value. As follows.
[19]
[20] Flexural rigidity And modulus of elasticity The value of is when the direction of fiber is circumferential Becomes a very large value Is a smaller value than the stiffness in the circumferential direction.
[21] In case of pressure pipe, the axial rigidity of the whole pipe In this case, in order to have resistance axial force in the tube axis direction, the direction of fiber should be arranged in the tube axis direction in order to have a resistance axial force in the tube axis direction. When the core tube is manufactured by a pultrusion process, it is possible to form a mechanically rational composite structure system by increasing the fiber contents or by arranging the fiber material as a high strength material. Can be designed selectively.
[22] When manufacturing the skin structure, core structure, or pipe, the manufacturing method can be selectively designed in consideration of economical efficiency, manufacturability, and safety.
[23] The field connection part is manufactured in accordance with the pipe standard by adapting the adapter of the ring-shaped connection part with flange as shown in Fig. 6, but it is possible to insert the connection tube shaped like the tube installed in the core of the pipe into the core tube. Install a soft packing at the end as shown in Figure 8 so that a slight gap occurs. After insertion, it is manufactured to prevent gaps. In the circumferential direction, it is divided into several parts in consideration of convenience at the time of installation.
[24] Once the core part of the biped pipe is inserted into each other, the tube connecting members protruding from the ring are inserted into each other, and then the connecting rings are connected to each other in the circumferential direction and tightened with bolts to complete the assembly. Next, after joining the tape of the preprey type to the inner joint of the pipe and injecting the adhesive through the gaps spaced apart by the injection injection method, the adhesive is evenly injected as shown in Fig. 7 so that both the pipe and the adapter ring After filling, the adhesive cures to complete the site connection.
[25] Here, the adapter ring can be processed with HDPE, polyester, and width of epoxy, and can be manufactured with various molding forms. In other words, it is necessary to select the most suitable molding method from various moldings such as resin transfer molding, injection molding, compression, autoelave molding, etc. to select economically and mechanically suitable methods. The adhesive may be Epoxy Polyurethane arcrylic. The most appropriate adhesive in the process can be used.
[26] As described above, the present invention increases the strength as well as the stiffness with a small amount of material, so that it can bear a large load even with a small cross section, and has sufficient safety against strength. The use of satisfactory anisotropic materials and mechanically reasonable and economical plastic pipes will be achieved.

权利要求:
Claims (1)
[1" claim-type="Currently amended] Glass fiber mats or woven rovings are rotated on a large cylindrical workbench in multiple layers using a rotary device, layed up with a wet resin, and laminated or molded by filament winding. A method for producing a composite large synthetic resin tube having a core consisting of a rectangular tube, characterized in that the part is laid up in multiple layers.

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同族专利:

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2000-07-06|Application filed by 장석윤

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2000-07-06|Priority to KR1020000038662A

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2002-01-16|Publication of KR20020004602A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020000038662A|KR20020004602A|2000-07-06|2000-07-06|Method of Manufacturing Double-Walled Plastic Pipe|