JPH0348474Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connection structure for corrugated pipes that are suitably used as underdrain drainage pipes and the like.

[Prior art]

As is well known, synthetic resin corrugated pipes made of alternately connected peaks and valleys are lightweight and have high pressure resistance, so they have come to be used for applications such as underdrain drainage.

By the way, the connection of such corrugated pipe is
Normally, as shown in FIG. 6, corrugated pipes 1
Insert the end of the corrugated pipe into the trough 1 of the end of the corrugated pipe.
This is done by fitting the protrusion 102 into the protrusion 100b and engaging it with the peak 100a.

[Problems to be solved by the invention] However, in the above connection structure, if a large protrusion 102 is formed on the inner surface of the pipe joint 101 to ensure that the corrugated pipe 100 is not pulled out, the work of inserting the corrugated pipe 100 becomes difficult. On the other hand, if the protrusion 102 was made smaller in order to make the insertion work easier, there was a problem that the corrugated pipe 100 would easily slip out due to insufficient slip-out prevention effect.

[Means to solve the problem]

In order to solve the above problems, the corrugated pipe connection structure of the present invention is a structure in which the end of the corrugated pipe is connected by connecting the peaks and valleys alternately into the pipe joint, and the above-mentioned An eccentric C ring, in which the large diameter part of the ring protrudes from the peak part, is fitted into the trough of the corrugated pipe, while a convex part is formed on the inner surface of the pipe joint, and the end of the corrugated pipe is inserted into the pipe joint. The present invention is characterized in that the outer surface of the large ring diameter portion of the eccentric C ring is brought into pressure contact with the convex portion on the inner surface of the pipe joint by rotating the corrugated pipe or the pipe joint.

[Effect of invention]

With the above connection structure, corrugated pipes can be connected simply by fitting an eccentric C ring into the trough at the end of the corrugated pipe, inserting it into the pipe joint, and rotating the corrugated pipe or pipe joint. The work becomes easier, and the large diameter part of the eccentric C ring that protrudes from the peak of the corrugated pipe and the convex part on the inner surface of the pipe joint come into pressure contact with each other due to the above rotation.
The frictional force can satisfactorily prevent the corrugated pipe from coming off.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is an exploded perspective view showing one embodiment of the connection structure of the present invention, Fig. 2 is a front view with a main part cut away of the same embodiment, and Figs. 3 and 4 respectively show a corrugated pipe. FIG. 3 shows cross-sectional views of the same embodiment before and after rotation. In the figure, 1 is a corrugated pipe made of synthetic resin such as polyethylene or vinyl chloride, and has annular peaks 2 and troughs 3 connected alternately. An eccentric C ring 4 made of hard rubber or the like is fitted directly or via an adhesive. The eccentric C ring 4
is formed eccentrically and slightly larger than a semicircle so that one end is the ring large diameter part 5 and the other end is the ring small diameter part 6, and when fitted into the trough 3 of the corrugated pipe 1, the ring The large diameter portion 5 protrudes from the peak portion 2, and the ring small diameter portion 6 is configured to be lower than the peak portion 2. Reference numeral 8 denotes a pipe joint made of synthetic resin such as polyethylene or vinyl chloride, into which the corrugated pipe 1 fitted with the eccentric C-ring 4 is inserted. The pipe joint 8 has a reduced diameter portion 1 at a location corresponding to the eccentric C ring 4 on its outer peripheral surface.
0, and a convex portion 11 is formed on the inner surface. It is formed wider than the width of the outer surface 7 of the ring large diameter portion 5 of the eccentric C ring 4. When inserting the corrugated pipe 1 through the openings 9, 9 at both ends of the pipe joint 8, as shown in FIG. It is necessary to insert it so as not to hit the convex portion 11 on the inner surface of the pipe joint 8. In this state, if you turn the corrugated pipe 1 approximately 180 degrees to the right in the figure or rotate the pipe fitting 8 approximately 180 degrees to the left, the fourth
As shown in the figure, the ring large diameter portion 5 of the eccentric C-ring 4 is in pressure contact with the convex portion 11 on the inner surface of the pipe fitting 8, and furthermore, on the opposite side, the trough portion 2 of the corrugated pipe 1 and the inner surface of the pipe fitting 8 are in pressure contact with each other. The corrugated pipe 1 is firmly connected in a press-contact state.

Next, FIG. 5 shows a front view with a main part cut away of another embodiment. In this embodiment, a concave portion 12 into which the ring large diameter portion 5 can fit is formed in a convex portion 11 on the inner surface of the pipe joint 8. Since the other configurations are the same as those of the previous embodiment, their explanation will be omitted. In this embodiment as well, when the corrugated pipe 1 is connected, the ring large diameter portion 5 of the eccentric C ring 4
It goes without saying that when the ring is fitted into the recess 12, it becomes crimped and is firmly connected, and the large diameter part 5 of the ring is caught in the recess 12, completely preventing the corrugated pipe 1 from falling out. Become.

Incidentally, the eccentric C ring 4 is connected to the crest 2 of the corrugated pipe 1.
If the ring has a trapezoidal shape that matches the shape of the groove formed by the grooves 3 and the large diameter portion 5 of the ring protrudes from the peaks 2 of the corrugated pipe 1, it will idle when the corrugated pipe 1 or the pipe joint 8 rotates. This is preferable because it eliminates this problem and allows for a more reliable connection. Further, the ring large diameter portion 5 may be provided in the middle portion of the eccentric C ring 4, and both ends may be formed as ring small diameter portions. In that case, the corrugated pipe 1 or the pipe joint 8
There is an advantage in that the large diameter portion 5 of the ring can be pressed against the convex portion 11 on the inner surface of the pipe joint whether the ring is rotated clockwise or counterclockwise.

[Effect of idea]

As is clear from the above description, according to the corrugated pipe connection structure of the present invention, the eccentric C ring is fitted into the trough at the end of the corrugated pipe and inserted into the joint to connect the corrugated pipe or pipe joint. Connection work can be easily performed by simply rotating the pipe, and the effect of preventing the corrugated pipe from slipping out of the pipe joint is achieved.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the corrugated pipe joint structure of the present invention, Fig. 2 is a front view with a main part cut away of the same embodiment, and Fig. 3 is the same implementation before rotating the corrugated pipe. FIG. 4 is a cross-sectional view of the same embodiment after rotating the corrugated pipe, FIG. 5 is a front view with a main part cut away of another embodiment, and FIG. 6 is a conventional corrugated pipe joint. A front view of the main part of the structure is shown. (Explanation of symbols) 1... Corrugated pipe, 2... Mountain part, 3... Valley part, 4... Eccentric C ring, 5... Ring large diameter part,
7... Outer surface of ring large diameter part, 8... Pipe fitting, 11...
...Protrusion.

Claims (1)

[Scope of utility model registration request] In a structure in which the end of a corrugated pipe formed by connecting alternate peaks and valleys is inserted into a pipe joint and connected, an eccentric C ring in which a large diameter portion of the ring protrudes from the peak in the valley of the corrugated pipe. At the same time as fitting the
A convex portion is formed on the inner surface of the pipe joint, and with the end of the corrugated pipe inserted into the pipe joint, the corrugated pipe or pipe joint is rotated so that the outer surface of the ring large diameter portion of the eccentric C ring is formed on the inner surface of the pipe joint. A corrugated pipe connection structure characterized by pressure contact with the convex part of the corrugated pipe.