JPS598061Y2 - Reinforced synthetic resin pipe - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to reinforced resin pipes used for various crosspieces, support members, etc.

For example, a resin pipe made of hard polyvinyl chloride and formed into an extruded shape with an appropriate number of metal wires embedded as reinforcing materials, or a thick part that acts as reinforcing ribs is used for seaweed cultivation nets, roads, etc. It is used for the support of signs, etc., but it is usually manufactured by extrusion or shaping method so that it is as straight as possible.For this reason, for example, when it is used for the fence of roads, land boundaries, etc., it is not bent. In places where the pillars are bent, it is necessary to change the connection direction with the pillars so that the entire structure is bent, and in places where the pillars are curved with a small radius, the spacing between the pillars must be made small or the beams will protrude.

The purpose of this project is to solve these problems and provide a curved pipe with excellent mechanical strength.
A plurality of metal wires extending in the tube axis direction are buried, and a thick wall portion extending in the tube axis direction and serving as a reinforcing rib is formed, and the metal wires and the thick wall portions are arranged at equal intervals in the tube circumferential direction. The metal wires are buried next to each other.

An embodiment of the present invention will be described below with reference to the drawings, in which polyvinyl chloride, polyethylene, and other hard synthetic or resin materials are continuously extruded together with metal wires using a conventional extruder and a certain shaping device. At the same time, the thick walled portions 3 and 4 extending in the tube axis direction are formed at equal intervals in the circumferential direction of the tube, and the metal wires 2 are attached to a plurality of adjacent thick walled portions 3. The remaining adjacent thick-walled portions 4 that are buried are designed to function as reinforcing ribs without burying the metal wire 2, and the thick-walled portions 4 that function as reinforcing ribs are provided. The sides are curved inward.

In FIG. 1, six thick-walled portions 3 and 4 are bulged at equal intervals on the inner peripheral surface of a tube body 1 having a circular cross-section, and metal wires 2 are formed on each of the four adjacent thick-walled portions 3. In addition to burying
The remaining two adjacent thick parts 4, 4 are constructed as reinforcing ribs without metal wires.

In addition, such composite resin pipes can be extruded or shaped using a molding die that forms thick-walled parts at equal intervals around the circumference, without supplying metal connecting wire to some of the parts. A large amount of resin is consumed locally in the circumferential direction to fill the area where the metal wire should be buried, and the extrusion speed in that area decreases, so the metal wire is not buried. This means that the side where the thick part is provided is curved inward.

Generally, a metal wire 2 with a diameter of about 2 to 5 mm and a smooth surface is used, but it is also possible to use iron wire or stranded steel wire with knurling-like irregularities on the surface to combine or integrate with resin. There is also.

Further, it goes without saying that when the tube body 1 has a considerable wall thickness, the metal wire 2 is buried as is without providing the thick wall portion 3.

Furthermore, the graft copolymer of ethylene, vinyl acetate, and vinyl chloride as a composite resin has the same specific gravity, tensile strength, elongation, and compressive strength as general rigid polyvinyl chloride, and has better impact resistance and weather resistance. In this project, the graft copolymer is used as a resin material because vinyl acetate-based adhesives exhibit excellent adhesive properties for both graft copolymers and metals. In addition, by applying a vinyl acetate adhesive layer 5 to the surface of the metal wire 2 and embedding it in the resin body 1 as shown in the enlarged part of Figure 1, it is stable especially in cold regions or under the sea. It can be used as a tube body 1 and metal wire 2.
A composite resin pipe is provided which has a sufficient reinforcing effect without causing slippage between the pipe and the pipe.

Figures 2 and 3 show an example of a protective fence constructed using a composite resin pipe according to the present invention, in which a normal straight and reinforced composite resin pipe is cut to an appropriate length and placed on the ground. The pillars 10 are fixed upright at predetermined intervals, and horizontal bars 11a and 11b made of the resin pipes of the present invention are provided between them.

Fig. 2 is a plan view of a trench constructed along a curved road, and both ends of the horizontal beam 11a, which is arranged so that the curve of the pipe matches the curve of the road, are inserted and connected to the pillars 10. .

Figure 3 is a front view of the structure constructed along a straight boundary.
b are arranged close to each other in the middle, and both ends thereof are inserted and connected to the support column 10.

As described above, the present invention embeds a plurality of metal wires in the pipe body and forms a thick wall portion that acts as a reinforcing rib in place of the metal wires, and these metal wires and thick wall portions are The metal wires are provided at equal intervals in the circumferential direction, and the metal wires are buried next to each other, so the reduced mechanical strength due to the metal wires not being buried is sufficiently compensated for by the thick portions of appropriate thickness and width. It can provide the same strength as a large number of metal wires buried at equal intervals, and since the metal wires are buried next to each other instead of being arranged evenly in the circumferential direction, it is especially effective for bending. Even without any processing, it is possible to obtain a tube with the thick wall part curved inward by extrusion shaping.

Such pipes can be laid as rails for fences on curved areas such as roads and land boundaries, and can be laid along curves without sticking out, or can be used to construct protective fences with excellent design value on straight areas. It has an extremely wide range of uses.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged vertical sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are a plan view and a front view showing an example of use. 1...Pipe body, 2...Metal wire, 3,
4... Thick wall portion, 5... Adhesive layer.

Claims (1)

[Scope of utility model registration request] A plurality of metal filaments 2 extending in the tube axis direction are embedded in the tube body 1, and a thick wall portion 4 extending in the tube axis direction and serving as a reinforcing rib is formed, and the metal filament 2 and the thick wall portion Reference numeral 4 denotes a reinforced resin tube which is provided at equal intervals in the tube circumferential direction, and the metal wires 2 are buried adjacent to each other.