JPH01283495A - Connecting structure of corrugated pipe - Google Patents

Abstract

PURPOSE:To facilitate connection of corrugated pipes by laying over the ends of corrugated pipes caps which have cylindrical parts, flange parts, partitioning pieces, holes and cylindrical connecting bodies, and forming foam type synthetic resin layers thereon. CONSTITUTION:This is a connecting structure of corrugated pipes having a recessed groove of spiral shape. The connecting structure is mounted with a cylindrical part 12 which covers edges of 2 corrugated pipes P1, P2, a flange part 13 which abuts end circumferences of the corrugated pipes P1, P2, and caps 2, 3 consisting of a partitioning piece 14 which protrudes from an internal wall of the cylindrical part 12 and partitions recessed grooves 8, 9. Further, a cylindrical connector 6 extending from the cap 2 on one side, and a cylindrical connector 7 which engages with this connector 6 retaining liquid-tightness are mounted. Then, foam type synthetic resin is injected through a hole 15 provided in the caps 2, 3, resulting in the formation of foam layers, 4, 5 and completion of the connecting structure. As a result, the rigid connection and high seal effect are secured.

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to a corrugated pipe connection structure, 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 corrugated pipe connection structure that can be connected to a corrugated pipe.

(B) Prior Art] As an example of a connecting structure for a rugate pipe, the following pipe joints may be used.

In other words, the W joint is made by bending a rectangular body plate into an arc shape, forming bent pieces on opposing parts, and fastening these bent pieces with bolts and nuts, thereby bringing the body plates into a butt state. Wrap it around the body of each corrugated tube so that it straddles the edges of the pair of corrugated tubes, and seal the two corrugated tubes together.

Note that a sealing material (ring-shaped backing) is usually interposed between each corrugated pipe and the body plate to improve the degree of sealing of both corrugated pipes.

(c) Problems to be Solved by the Invention Normally, drain pipes must be connected at the site where they are buried in the ground. Therefore, when the above-mentioned pipe joint is used to connect the drain pipe, it is necessary to attach the rectangular side plate to the corrugated pipe and attach bolts and nuts at the site. The work at this site is extremely demanding.

(d) Means for Solving the Problems and Their Effects This invention provides: i) two corrugated pipes that are approximately cylindrical and have a spiral groove on at least their surface; 1) the joining side ends of these corrugated pipes; cylindrical parts that are closely spaced in each part, flange parts that extend centripetally from the peripheral edges of these cylindrical parts and come into contact with the peripheral ends of the corresponding corrugated pipes, and inner walls of these cylindrical parts. consisting of partition pieces that protrude individually or separately from each other and partition the grooves of the corresponding corrugated pipes,
The position of each cylindrical part between its peripheral edge and the corresponding partition piece 7?
Two cap bodies having this through hole, I! one cylindrical joint that integrally and coaxially extends from one of the cap bodies, and another cylindrical joint that integrally and coaxially extends from the other cap body and that fits into the joint in a fluid-tight manner; iv) Foaming that is injected as an undiluted solution through the through holes of the two cap bodies, solidifies the foam after injection, and fixes each corrugated pipe and the corresponding cap body together before fitting the two cylindrical joints together. This is a corrugated pipe joint structure made of synthetic resin layers.

That is, the present invention has a construction in which specific cap bodies are fixed in advance to the joining side end portions of both corrugated pipes, and both corrugated pipes can be joined by simply fitting the cap bodies together. At the site, it is possible to simply fit the cap bodies together.

Further, in the present invention, the corrugated pipe and the cap body include:
A foaming solution is injected into the gap between the corrugated pipe and the cap body, and the foam is solidified and fixed, making it possible to form a simple and strong bond, as well as providing a seal between the corrugated pipe and the cap body. It can be done by

In this invention, the partition piece is formed so as to protrude as one piece or as a separate piece from the inner wall of the cylindrical part of the cap body, but conversely, it can also be formed as one piece or as a separate piece that protrudes from the corrugated pipe side.

In this invention, the liquid-tight fitting between the cylindrical bodies is achieved by fitting part or all of the body to the hard cap body.
The fitting may be performed by using three monolithic materials, and of course it is also possible to interpose one or several rings of backing between the two bonded bodies as in the embodiment.

(e) Examples Hereinafter, the present invention will be described in detail based on embodiments shown in the figures.

Note that this invention is not limited to this.

First, in FIGS. 1 and 2, the corrugated pipe joint structure l includes two corrugated pipes P, P2, a cap body 2.3 attached to the joint side end portion of these corrugated pipes,
A foamed synthetic resin layer 4.5 for fixing these cap bodies and the corrugated pipes P, , P, respectively in advance, and a foamed synthetic resin layer 4.5 extending integrally from both the cap bodies 2, 3, respectively, and fixing the corrugated pipes P, , P, respectively to each other in advance.
It is mainly composed of a cylindrical joint body 6 and 7 that connects 3.

Each of the corrugated pipes P, P2 has a substantially cylindrical shape, and has spiral grooves 8, 9 [or spiral convex grooves 10, 11] on its surface.
].

As shown in FIGS. 3 to 7, particularly in FIGS. 4 to 5, the cap body 2 includes a cylindrical portion I2 that is closely fitted over the connecting end portion of the corrugated pipe P, and a cylindrical portion I2 that extends from the peripheral edge of the upper portion of the tube. A flange portion 1 that abuts the circumferential end of a corrugated pipe P extending in the center direction.
3, and a partition piece (or stopper) 1 that separately projects from the inner wall side of the cylindrical part I2 and fits into the groove 8 of the corrugated pipe to partition it.
It consists of 4. The cylindrical $12 has a foaming stock solution injection hole I5 between its peripheral edge and the partition piece 14 and at an upper position. Note that the cap body 3 has substantially the same configuration as the above-described cap body 2, so a description thereof will be omitted.

Next, the above-mentioned cylindrical joint body 6.7 is integrally formed on both cap bodies 2.3.

That is, the cylindrical joint body 6 is composed of a cylindrical portion 30 extending integrally and coaxially from the cap body 2, and a small flange portion 31 bent in the direction of centripetal force from the tip periphery of this cylindrical portion, and the flange portion 13 and these cylinders A ring-shaped backing 32 made of neoprene rubber and having a hook-shaped cross section is fitted into the recess formed by the portion 30 and the small flange portion 31. On the other hand, the interlocking body 7 includes a cylindrical portion 34 extending integrally and coaxially from the inner circumferential edge of the flange portion 33 of the cap body 3, and a cylindrical portion 34 that extends outward in cross section from the tip edge of this cylindrical portion and is bent inward at an angle. A thin ring-shaped neoprene rubber backing 36 is fitted and laid in a recess formed by the flange part 33, the cylindrical part 34, and the bent part 35.

The cap body 2 and the cylindrical combined body 6, which are integrally formed as described above, are divided into a lower part 16 and a lower part 17, as shown in FIG. 7, and the opposed bent pieces 18, 19, 20.
21 through the reinforcing plates 22, 23, 24, 25 and the bolt 2
6.27 to make one cylindrical part (body).

The same applies to the cap body 3 and the cylindrical combined body 7. Note that the partition piece 14 is held between its opposing curved pieces 18 and 19. 28, 29, . . . are annular convex shapes formed at equal intervals on the back surface of the cylindrical portion 12 so as to wrap around the corrugated pipe P1 (see FIG. 4).

Thus, the corrugated pipe P as shown in Figs.

The upper and lower parts 16 and 17 of the cap body 2 are
are placed over the corrugated pipe P from above and below, and the partition pieces 14 are positioned and held so as to partition the predetermined grooves 8 of the corrugated pipe P. In other words, the opposing bent pieces of cap body 2! Tighten the bolt 26 at 8°I9 through the partition piece 14.

Next, a foaming solution made of polyurethane resin is injected through the through hole 15, and the foaming solution is injected into the spiral groove 8 of the corrugated pipe P1, the cylindrical portion I2 and the flange portion 13 of the cap body 2, and the partition piece 1.
4 is foamed and solidified in the cavity formed by the foamed synthetic resin layer 4. Of course, this foamed synthetic resin layer 4 allows the cap body 2 and the corrugated pipe P to be integrally connected, and improves the sealing performance between the inside and the outside of the corrugated pipe P. Note that before forming the foamed synthetic resin layer 4, the partition piece 14 is attached to the corrugated pipe P and the empty cap body 2.
However, what actually prevents relative movement between the corrugated pipe P and the cap body 2 during use is the foamed synthetic resin that has entered the groove 8 of the corrugated pipe P1. In other words, a large number of annular protrusions 28, 29 formed in a wrap-around shape on the back surface of the cap body 2.
- It is a foamed synthetic resin layer that has penetrated between.

As described above, one corrugated pipe P and the cap body 2
The cylindrical combined body 6.7 and Cap body 2.3
and corrugated pipes P, , P, are brought to the burial site in the soil in an integrated state, and can be engaged simply by bringing the two cylindrical joints 6.7 close to each other in the coaxial direction. P+ and Pt can be combined (spliced). In other words, the annular backing 32 attached to one of the cylindrical joints PI
The hook-shaped portion deforms and rides over the bent portion 35 of the other cylindrical joint 7 and brings the annular backing 36 into close contact with the annular backing 36 in a press-fitting manner, thereby liquid-tightly connecting both the corrugated pipes Pl and P2.

(f) Effects of the Invention According to the present invention, specific cap bodies are fixed in advance to the joint side end portions of both corrugated pipes, and at the work site, the cylindrical joint bodies formed integrally with the cap bodies are simply engaged with each other. Both corrugated pipes can be joined using a chisel. Further, according to the present invention, since the cap body is fixed to the corrugated pipe by injecting the foaming solution into the gap between the two, the fixation is strong and a high sealing effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a horizontal cross-sectional explanatory diagram showing one embodiment P+ of the present invention,
Fig. 2 is a front view of the embodiment, Fig. 3 is an exploded front view of the cap body and cylindrical combined body, Fig. 4 is an enlarged sectional view taken along line A-A in Fig. 3, and Fig. 5 is Fig. 4. FIG. 6 is an enlarged end view along line DD of FIG. 3, FIG. 6 is an enlarged cross-sectional view taken along line CC in FIG. ■・・・Connection structure of corrugated pipe, 2.3...
... Cab padding, 4.5 ... Foamed synthetic resin layer, 6.7 ... Cylindrical combined body, 8,9 ... Concave groove, 12 ... ...Cylindrical part, I3...
...Flange part, 14...Partition piece, 1
5...Through hole. Figure 3B-,-,. ″′1 B=J, # Fig. 4 Fig. 5

Claims (1)

[Scope of Claims] 1. i) two corrugated pipes that are substantially cylindrical and have a spiral groove on at least their surface; ii) a cylinder that is closely fitted over the connecting end portions of these corrugated pipes. flange portions extending centrially from the circumferential edges of these cylindrical portions and abutting the circumferential ends of the corresponding corrugated pipes; and flange portions protruding from the inner walls of these cylindrical portions as one or separate pieces. and a partition piece that partitions a concave groove of a corrugated pipe, each cylindrical part having a through hole at a position between its peripheral edge and the corresponding partition piece; iii) one of the cap bodies; one cylindrical joint that integrally extends coaxially from the cap body, and another cylindrical joint that integrally extends coaxially from the other cap body and fits into the joint in a fluid-tight manner; and iv) 2 above. The undiluted solution is injected through the holes in the two cap bodies, and after being injected, it is foamed and solidified to connect each corrugated pipe and the corresponding cap body from a foamed synthetic resin layer that is fixed together before the two cylindrical joints are fitted together. The joint structure of corrugated pipes.