JP2578693Y2 - Corrugated tube connection structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for connecting a synthetic resin corrugated pipe used as a drain pipe or a water pipe so as not to leak water.

[0002]

2. Description of the Related Art Conventionally, many proposals have been made for a connection structure of a corrugated tube, but it is surprisingly difficult to connect the structure by a simple operation so as not to cause water leakage. For example, a method is generally adopted in which a flange is provided at a pipe end, and packing is sandwiched between the flanges to connect the flanges with bolts. Although such a connection structure is unlikely to cause water leakage and the connection work is relatively simple and has many excellent points, it has a major drawback.

[0003]

[Problems to be solved by the invention] When using a fixed-length corrugated tube, connection is possible if flanges are provided at both ends of the tube, but when a corrugated tube is cut and used, it is cut off. However, there is a problem that connection cannot be made because the connection portion has no flange. By the way, there are many means for continuously forming a corrugated tube, but there are many difficulties in simultaneously forming a flange portion in a process of forming a corrugated tube, and usually equipment for forming a flange portion is provided. There was a troublesome problem that it had to be made in a separate process.

The present invention has been made in view of the above problems, and provides a connection structure that does not require a facility for forming a flange portion and that can be connected as it is by cutting a corrugated pipe to a required length at a construction site. The purpose is to do.

[0005]

In order to achieve the above object, the connecting structure of the present invention is arranged such that pipe ends of a corrugated pipe having an annular ridge and an annular valley alternately abut, An annular elastic body having a recess into which one of the tube ends can be inserted is sandwiched between the tube ends, and is fixed in a state where the tube ends are brought close to each other.

[0006]

According to the structure of the present invention, since the tube ends are arranged so as to abut each other and the annular elastic body having a recess into which at least one of the tube ends can be inserted is sandwiched between the tube ends.
The gap at the end of the tube is completely closed by the elastic body. And since the elastic body is fixed between the pipe ends while being held between the pipe ends, water in the pipe does not leak from the connection portion of the pipe. Further, since the pipe end can be inserted into the recess of the elastic body, the position of the elastic body does not shift or come off between the pipe ends, and the workability is extremely good.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of a connection structure for a corrugated tube according to the present invention. In FIG. 1, reference numerals 2 and 3 denote corrugated tubes having annular peaks 12 and 13 and annular valleys 32 and 33 alternately. The corrugated tubes 2 and 3 are usually made by continuous blow molding of a synthetic resin such as polyethylene or polyvinyl chloride, and have a tube outer diameter of about 50 to 800 mm and a height from a valley to a peak of 5 mm. １００100 mm.
The inside of the pipes 2 and 3 may be corrugated, but when used for a drain pipe or the like, a pipe having a smooth surface 22 with good water flow is preferably employed. The tubes 2 and 3 are arranged such that their ends abut each other, and the elastic body 5 is interposed therebetween.

FIG. 2 shows an elastic body 5 preferably used in the present invention.
FIG. 3 is a cross-sectional view taken along line AA of FIG. 2. In FIG. 3, reference numeral 51 denotes a recess provided on the entire ring, 53 denotes an outer edge portion, and 52 denotes an inner edge portion. The recess is usually surrounded by the outer edge 53, the inner edge 52, and the back wall 55, and the tube end is in contact with the back wall 55.

FIG. 4 is a partially enlarged cross-sectional view in which the end of the tube and the elastic body 5 are arranged in abutting condition. In FIG.
The pipe end 26 is inserted into the recess of the elastic body 5. Inner wall 2 of tube 3
It is desirable that the height from the inner surface of the second to the outer surface of the crest 13 is formed to be substantially the same as the distance between the inner edge 52 and the outer edge 53 of the recess 51. On the other hand, the tube end 27 of the tube is in contact with the outer wall portion 54 of the elastic body, and the diametrical width of the outer wall portion 54 is formed to be larger than the height from the inner surface of the inner wall 22 of the tube to the outer surface of the peak portion 12. Must be. In addition, the inner edge 5
2 is extremely small or absent does not depart from the technical scope of the present invention, in which case the recess refers to the portion surrounded by the outer edge 53 and the back wall 55.

FIG. 5 is a partially enlarged sectional view showing a state in which the tubes in FIG. 4 are brought close to each other. In FIG. 5, the ends of each of the tubes 2 and 3 have an elastic body 5 interposed therebetween through an elastic body 5.
A force is applied to push the outer wall portion 54 and the inner wall portion from both sides to bring the tube end and the elastic body into close contact.

There are various means for bringing the pipe ends closer.
For example, the fixing tool 6 shown in FIG. 6 covers the outer circumference of the pipe, and is provided on the inner surface side of the half-tubular body so as to be fitted with the valley of the pipe when the pipe is in the close state, and can be fitted with the ridge 61. , 62 are provided, and the upper half body 63 and the lower half body 64 are fastened and fixed by the band 65 from the outer periphery of the half bodies 63, 64 in a superposed state. I have. The fixture 6 can be easily formed by molding a metal such as aluminum or iron or a synthetic resin.

In addition, as a means for fixing the two pipes such that the pipe ends are brought close to each other with the pipe ends abutting, a metal wire is wound around the valleys near the respective pipe ends of the two pipes. It is also possible to connect different lines at several places to the metal lines, and bring the connected lines closer to each other and bind them.
As described above, the means for fixing the pipe ends in the close state is good as long as the pipes do not move or shift in the close state, and are not particularly limited in the configuration of the present invention.

The material of the elastic body 5 used in the present invention is preferably a flexible closed cell made of rubber or synthetic resin. Particularly, a material which expands by absorbing water retains watertightness. Is more preferable.

The shape of the elastic body 5 may be such that at least one concave portion enclosing the pipe end is provided over the entire annular elastic body. In some cases, the outer edge and the inner edge are partially missing. You may be doing. It is desirable that the elastic body does not fall from the tube end when the tube end is inserted into the recess. In such a case, the other end of the pipe can be brought close to the recess while the entire circumference of the pipe is fitted in the recess of the elastic body, so that even one person can connect the pipe. Needless to say, providing recesses at both ends in the axial direction of the annular elastic body does not depart from the technical idea of the present invention.

Since the elastic body of the present invention is used for a connection portion such as a drain pipe, it is desirable to use an elastic body having high tear strength and high durability as well as water resistance and chemical resistance. .

[0017]

The connecting structure for a corrugated tube according to the present invention is simple in operation because the annular elastic body having a recess is fixed between the tube ends with the tube ends brought close to each other. Nevertheless, there is a remarkable effect that there is no water leakage. In particular, since the elastic body having the concave portion surrounds at least one of the tube ends, the elastic body does not shift or come off from the tube end, and has an excellent effect that a reliable watertightness can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a pipe connection structure showing one embodiment of the present invention.

FIG. 2 is a front view showing one embodiment of the elastic body used in the present invention.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a cross-sectional view of a main part when the tubes are brought into a butted state via the elastic bodies of FIGS. 2 and 3;

5 is a cross-sectional view of a main part when the pipe end shown in FIG. 4 is brought into a close state.

FIG. 6 is a cross-sectional view of a fixture showing an example for bringing the pipe ends closer to each other.

[Explanation of symbols]

 2,3 corrugated tube 5 elastic body 51 recess 12,13 mountain

Claims (1)

(57) [Scope of request for utility model registration] 1. An annular elastic body having a concave portion into which at least one of the tube ends can be inserted, wherein the tube ends of a corrugated tube having an annular crest and an annular valley are alternately abutted. A connection structure for a corrugated tube, characterized in that the tube structure is sandwiched between the tubes and fixed with the tube ends close to each other.