JPH045831Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to the connection structure of corrugated pipes, and specifically, for example, corrugated pipes such as drainage pipes and communication cable installation pipes can be easily installed underground. This invention relates to a connecting structure of corrugated pipes that can be connected.

(b) Prior Art Examples of the connection structure for corrugated pipes include the following pipe joints. In other words, a rectangular body plate is bent into an arc shape, and two half-split joints are prepared, each having a bent piece formed at the opposite part thereof, and then wrapped around the connecting part of the corrugated pipe, and then each bent piece is attached to a bolt and nut. By tightening the corrugated pipes, the pair of corrugated pipes facing each other are sealed together. Note that a sealing material (ring-shaped packing) is usually interposed in the gap between each corrugated pipe and the halved joint to improve the degree of sealing of the pair of corrugated pipes.

(c) Problems to be solved by the invention Normally, corrugated pipes must be joined at the site where they are buried in the ground. Therefore, when using the above-mentioned conventional coupling structure, it was necessary to prepare separate bolts and nuts and to couple the corrugated pipes together through many steps.

This invention was made in consideration of the above circumstances, and provides a joint structure for corrugated pipes that is easy to connect on-site and can flexibly deal with external forces without the need for joints.

(d) Means and operation for solving the problem This invention consists of a first corrugated pipe that is approximately cylindrical and has a spiral groove on at least its surface, and a first corrugated pipe that is attached to the body of the first corrugated pipe. A first tube having a cylindrical portion to be coupled and an annular portion integrally extending in the centripetal direction from the periphery of the cylindrical portion on the coupling side.
a cap body, a second corrugated pipe having the same shape as the first corrugated pipe, and a second corrugated pipe having the same shape as the first cap body, the cap body being connected to the body of the second corrugated pipe, and having an annular portion heated. This is a corrugated pipe connection structure consisting of a second cap body which is surface-bonded to an annular portion of a first cap body by fusion.

In this invention, the heat fusion may be performed by melting the first annular part and the second annular part with hot air, and then welding them by contacting and pressurizing them. The method may be such that a molten resin is sandwiched between the annular portions and the two are pressed and welded.Alternatively, a hot plate is brought into contact with the first annular portion and the second annular portion to melt both of the annular portions, and the annular portions are welded. After the parts are melted, the hot plate may be removed and the two parts may be welded by contacting and pressurizing them.

(e) Examples This invention will be described in detail based on the examples shown in the figures below. Note that this invention is not limited thereby.

In Fig. 1, the corrugated pipe connection structure is 2
two corrugated pipes 1 and 2, a cap 3 attached to the joining end of the corrugated pipe 1, and a cap 3 attached to the joining end of the corrugated pipe 2 and heat fused (hereinafter referred to as welding) to the cap 3. It mainly consists of a cap 4.

The corrugated pipes 1 and 2 are made of synthetic resin, and both have a substantially cylindrical shape, and a spiral groove 5 (or a spiral convex shape 6) is formed on the outer surface thereof. Also, corrugated pipes usually have a wall thickness of 1 to 15 mm.
The inner diameter ranges from approximately 100mm to 3,000mm. They are buried underground under roads and grounds and are used as drainage pipes, communication cable installation pipes, etc.

The cap 3 is made of synthetic resin, and as shown in FIG. 2, has a cylindrical portion 3b whose inner surface 3a is attached to and fixed to the body portion of the corrugated pipe 1 (the upper surface portion of each continuous convex portion 6); The cylindrical portion 3b has an annular portion 3d extending integrally from the coupling side peripheral edge 3c in the centripetal direction. The axial length “A” of the cylindrical portion 3b is set to a length that allows at least two convex portions 6 of the corrugated pipe 1 to hang thereon.
The diametrical length “B” of the annular portion 3d is approximately the height of the convex portion 6 of the corrugated pipe 1 plus the thickness of the cap 3 itself, and this length ensures that the corrugated pipes 1 and 2 are Form a welding surface large enough to join.

Further, the cap 3 is formed to have a wall thickness of 3 to 10 mm depending on the inner diameter of the corrugated pipe, but a preferable wall thickness is in the range of 5 to 10 mm. And this cap 3
is attached to the joining side end of the corrugated pipe 1 via an adhesive and fixed to the corrugated pipe 1.

The cap 4 is of the same quality and shape as the cap 3, has a cylindrical portion 4b and an annular portion 4d, and is attached to the connecting end of the corrugated pipe 2 via adhesive in the same manner as the method of fixing the cap 3. and fixed to the corrugated pipe 2. In addition, caps 3 and 4
For fixing the corrugated pipes 1 and 2, an adhesion method other than adhesive may be used. For example, a stopper (not shown) that prevents the caps 3, 4 from falling out of the grooves 5 of the corrugated pipes is installed between the caps 3, 4 and the corrugated pipes 1, 2, and the inner walls of the cylindrical portions of the caps 3, 4 and the corrugated pipes are connected to each other. tubes 1, 2
The gap formed between the outer surface and the outer surface may be filled with foamable synthetic resin and fixed.

In this way, caps 3 and 4 and corrugated pipe 1,
2 are integrated in advance in a factory, for example, and transported to a work site.

Next, the connection of corrugated pipes at the work site will be explained.

Bonding by Hot Air Welding The surface layer of each annular portion 3d of the cap 3 and the annular portion 4d of the cap 4 is melted with hot air using a heating tool such as a hot air gun. When the surface layer is melted to the extent that corrugated tubes can be joined together, both corrugated tubes 1 and 2 are positioned coaxially, and then both corrugated tubes 1 and 2 are welded by contacting and pressurizing the annular portions.

Bonding using molten resin The molten resin extruded from an on-site extruder is
sandwiched between the annular portion 3d and the annular portion 4d,
Both corrugated pipes 1 and 2 are welded by contacting and pressurizing the annular portions 3d and 4d.

Bonding by hot plate welding The annular parts 3d and 4d, which are the parts to be welded, are closely melted on a temperature-controlled hot plate, and the molten surfaces are quickly brought into contact and pressurized, and the corrugated pipes 1 and 2 are held until they are fixed. to weld. Note that the hot plate is usually covered with a Teflon sheet to prevent adhesion of the parts to be welded.

Any of the above-mentioned joining methods may be used to join the corrugated pipes.

(f) Effects of the invention According to this invention, a cap body having a wide annular joining surface is fixed in advance to each end of the joining side of the corrugated pipe, so that when joining corrugated pipes on site, the cap body is fixed in advance. Both corrugated pipes can be easily joined by simply heat-sealing the annular parts of the body together. In addition, according to this invention, there is no need to use a special joint that matches the diameter of the corrugated pipe, and there is no need to use fastening parts such as bolts and nuts, so the work time required for joining can be shortened. The joining work can be carried out by workers. Furthermore, since the combined corrugated pipes form an integral structure, it is possible to flexibly deal with external forces acting on the corrugated pipes.

[Brief explanation of drawings]

FIG. 1 is a horizontal sectional view showing an embodiment of this invention, FIG. 2 is a perspective view of the cap shown in FIG. 1, and FIG. 3 is a perspective view showing a state in which corrugated pipes are connected in the embodiment. DESCRIPTION OF SYMBOLS 1...First corrugated pipe, 2...Second corrugated pipe, 3...First cap body, 4...Second
Cap body.

Claims (1)

[Claims for Utility Model Registration] A first corrugated pipe that is approximately cylindrical and has a spiral groove on at least its surface; a cylindrical part that is attached to and connected to the body of the first corrugated pipe; a first cap body having an annular portion extending integrally in the centripetal direction from the connecting side peripheral edge of the cylindrical portion; a second corrugated pipe having the same shape as the first corrugated pipe; a second cap body which has the same shape as the body and is connected to the body of the second corrugated pipe, and whose annular part is surface-bonded to the annular part of the first cap body by heat fusion. The joint structure of corrugated pipes.