JPH1194146A - Connecting pipe of rainwater or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a simple connecting pipe. SOLUTION: This connecting pipe of rainwater or the like is constituted of a resin pipe 1 of a fixed length which is formed by synthetic resin, a resin connecting pipe 2 of the same dimension which is connected with the resin pipe 1, a small diameter part 4 whose thickenss is worked and formed thin by a method recessing the outside on the tip part 3 of the resin pipe 1, a fitting fart 6 into which the small diameter part 4 whose thickness is worked and formed thin by a method recessing the inside face side fits on a tip part 5 of the resin connection pipe 2 and a heat contraction tube which is covered on the outer periphery joined by inserting the small diameter part 4 into fitting part 6. This heat contraction tube is heated up to 150 deg. or higher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection pipe which hardly receives pressure, such as a connection pipe for rainwater or the like.
INDUSTRIAL APPLICABILITY The present invention can be used not only for rainwater connection pipes but also for similar connection pipes.

[0002]

2. Description of the Related Art It is conventionally known to connect a resin connecting pipe of the same dimension to a resin pipe of a fixed length formed of a synthetic resin.

[0003]

The known ones have been rigidly connected by fairly complex hardware. However, since connection pipes such as rainwater hardly receive pressure, they can be connected without using expensive and robust metal fittings.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a resin pipe 1 made of synthetic resin and having a fixed length, a resin connecting pipe 2 of the same dimensions connected to the resin pipe 1, and a resin pipe. A small-diameter portion 4 formed by thinning the thickness at the end 3 of the resin connecting pipe 2 and a thinner thickness formed by recessing the inner surface at the end 5 of the resin connection pipe 2. The heat-shrinkable tube 7 comprises a fitting portion 6 to which the formed small-diameter portion 4 is fitted, and a heat-shrinkable tube 7 covering the outer periphery of the small-diameter portion 4 inserted into and joined to the fitting portion 6. This is a connection pipe for rainwater or the like obtained by heating to 150 ° C. or more. In the above, the heat-shrinkable tube 7 is a connection pipe for rainwater or the like having a three-layer structure of an outer layer 8 made of cross-linked polyethylene, an inner layer 9 made of a butyl rubber-based adhesive, and a release paper 10. In the above, the small-diameter portion 4 is attached to the fitting portion 6.
Is used as a connecting pipe for rainwater or the like to which an adhesive has been applied in advance. In the above, the fitting portion 6 and the small diameter portion 4 are connection pipes for rainwater or the like fitted with a gap.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a resin tube of a fixed length formed of a synthetic resin, which is used for applications such as rainwater that do not apply much pressure. Reference numeral 2 denotes a resin connecting pipe formed to have the same size (diameter) as the resin pipe 1. A small-diameter part 4 is formed at an end 3 of the resin pipe 1 by reducing the thickness of the resin pipe 1 from the outside by about half. Then, a fitting portion 6 is formed in the end portion 5 of the resin connection pipe 2 so as to fit the small diameter portion 4 whose thickness is reduced to about half by a method of being recessed from the inner surface side. The relationship between the small-diameter portion 4 and the fitting portion 6 may be such that when the pipe diameter is small, the fitting may be tight, but when the pipe diameter is large, the fitting operation becomes difficult. May be provided. The end portion 3 and the end portion 5 are connected to a small diameter portion 4 by a fitting portion 6.
Are joined by inserting. In this case, an adhesive may be applied to the joint in advance, or the joint may be heated and welded so that the once joined portion does not come off.

Reference numeral 7 denotes a heat-shrinkable tube, which has, for example, a three-layer structure of an outer layer 8 made of cross-linked polyethylene, an inner layer 9 made of a butyl rubber-based adhesive, and a release paper 10. When heated above ℃, it contracts and adheres.

[0007]

Next, the operation will be described. When the resin connecting pipe 2 is to be connected to the resin pipe 1, the end 3 of the resin pipe 1 is shaved from the outer periphery and the thickness thereof is formed into a small-diameter part 4 of about half,
The end portion 5 of the resin connection pipe 2 is formed by shaving the inner surface thereof to form the small-diameter portion 4.
Are tightly fitted, the small-diameter portion 4 of the end 3 of the resin tube 1 is fitted to the fitting portion 6 of the end 5 of the resin connection tube 2, and the resin tube 1 and the resin The heat-shrinkable tube 7 of the connection pipe 2 is covered. At this time, if necessary, an adhesive is applied to the outer surface of the small diameter portion 4 to fit the small diameter portion 4 into the fitting portion 6.

Then, the release paper 10 of the heat-shrinkable tube 7 covered is peeled off, and as shown in FIG.
When this is heated to 150 ° C. or more, it shrinks thermally, and a material which does not apply much pressure such as rainwater can be sufficiently used.

[0009]

The known ones are rigidly connected by fairly complex hardware. However, since connection pipes such as rainwater hardly receive pressure, they can be connected without using expensive and robust metal fittings. According to the present invention, a resin pipe 1 of a fixed length formed of a synthetic resin, a resin connection pipe 2 of the same dimensions connected to the resin pipe 1, and an outer end recessed at an end 3 of the resin pipe 1. The small-diameter portion 4 whose thickness has been thinned by the method and the small-diameter portion 4 whose thickness has been thinned by a method of recessing the inner surface side at the end 5 of the resin connection pipe 2 fit. Joint 6 and
A heat-shrinkable tube 7 covering the outer periphery joined by inserting the small-diameter portion 4 into the fitting portion 6 and connecting the heat-shrinkable tube 7 to 150 ° C. or higher to form a connection pipe for rainwater or the like. Therefore, the small diameter portion 4 is formed by recessing the end 3 of the resin tube 1 from the outside, and the small diameter portion 4 is fitted by recessing the end 5 of the resin connection tube 2 from the inside. After the fitting portion 6 is formed and the small-diameter portion 4 is joined to the fitting portion 6, the outer periphery of the fitting portion 6 is covered with a heat-shrinkable tube 7 and heated to 150 ° C. or more to form a connection pipe. It can be formed at low cost. In the above, the heat-shrinkable tube 7 is a connection pipe for rainwater or the like having a three-layer structure of an outer layer 8 made of cross-linked polyethylene, an inner layer 9 made of a butyl rubber-based adhesive, and a release paper 10. At the time of shrinkage, the inner layer 9 made of the adhesive is melted, so that the adhesive effect is improved. Further, in the above, when the small diameter portion 4 is inserted into the fitting portion 6, the connection tube is made of rainwater or the like to which an adhesive has been applied in advance, so that there is an effect of retaining the connection. In the above,
Since the fitting portion 6 and the small diameter portion 4 are connection pipes for rainwater or the like fitted with a gap therebetween, connection is easy particularly in the case of a large diameter connection pipe.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a connection pipe and a resin connection pipe.

FIG. 2 is a cross-sectional view in which a connection pipe and a resin connection pipe are joined, and a heat-shrinkable tube is put on the connection pipe.

FIG. 3 is a cross-sectional view of the heat-shrinkable tube of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... pipe, 2 ... resin connection pipe, 3 ... end part, 4 ... small diameter part, 5 ...
End portion, 6: fitting portion, 7: heat-shrinkable tube, 8: outer layer, 9
... inner layer, 10 ... release paper, 11 ... heating device.

Claims (4)

[Claims] 1. A fixed length resin tube 1 made of a synthetic resin, and a resin connection tube 2 of the same dimensions connected to the resin tube 1
A small-diameter portion 4 whose thickness is formed thin by a method of recessing the outside at the end 3 of the resin tube 1, and a method of recessing the inner surface side at the end 5 of the resin connection tube 2. A fitting portion 6 into which the small-diameter portion 4 formed to have a small thickness is fitted;
And a heat-shrinkable tube 7 covering the outer periphery joined by inserting the small-diameter portion 4 into the tube.
A connection pipe for rainwater or the like obtained by heating as described above. 2. The connection pipe for rainwater or the like according to claim 1, wherein the heat-shrinkable tube 7 has a three-layer structure of an outer layer 8 made of cross-linked polyethylene, an inner layer 9 made of a butyl rubber-based adhesive, and a release paper 10. 3. The connecting pipe according to claim 1, wherein an adhesive is previously applied when the small diameter section 4 is inserted into the fitting section 6. 4. The connection pipe for rainwater or the like according to claim 1, wherein the fitting section 6 and the small diameter section 4 are fitted with a gap.