JPH01303395A - Connection between pipe with rib and pipe coupling - Google Patents

Abstract

PURPOSE:To simplify the connecting operation by providing plural annular ribs around the outer periphery of a pipe and also providing engaging projections on an inner periphery wall of a socket part in the pipe coupling. CONSTITUTION:There is provided plural ribs 3 around the outer periphery of a pipe 2 and also engaging projections 6 for engaging with the annular ribs 3, on the inner periphery wall of a socket part 4 in the pipe coupling 1. Thus, since the pipe 2 can be connected to the pipe coupling 1 by engaging the engaging projections 6 with the annular ribs 3, the connecting operation can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of connecting a ribbed pipe having a large number of annular ribs on its outer circumferential surface and a pipe joint.

(Prior art) Pipe joints are generally used to connect pipes to each other, and when trying to prevent the pipe from coming off from the pipe joint, conventionally, for example, a stopper rod that connects the two, etc. Special parts were used. In addition, flanged joints are used to connect pipes to each other, and when making connections, the joints are attached to the connecting ends of the container pipes, and then both flanges are joined and parts such as bolts and nuts are attached to the flanges. It was concluded.

(Problem to be solved by the invention) As described above, the conventional connection method requires special parts such as a retaining rod, which increases the cost of parts and makes it uneconomical. There was a problem that it was too complicated. Further, in the case of a flange joint, it is necessary to attach it to the ends of the pipes and to fasten both flanges with bolts or the like, which makes the connection work complicated.

The inventors completed the present invention in view of these conventional problems, and also focused on the fact that the ribs of the ribbed tube can be used to prevent the ribbed tube from slipping out, especially when connecting the ribbed tube and the pipe joint. Ta.

(Means for Solving the Problems) A method for connecting a ribbed pipe and a pipe joint according to the present invention includes the following steps when connecting a pipe joint having a socket portion to a ribbed pipe having a large number of annular ribs on the outer peripheral surface. On the inner peripheral wall of the socket part,
Prepare a pipe joint in which one or more locking protrusions are formed to engage with the ribs of the ribbed pipe, and attach each rib located at the end to the pipe axis at the connection end of the ribbed pipe. A protrusion passage portion for passing the locking protrusion of the pipe joint is formed by partially cutting along the pipe joint, and the locking protrusion of the pipe joint is aligned with this protrusion passage portion to form the pipe joint into a ribbed pipe. After inserting it into the connecting end of the pipe fitting or ribbed pipe, rotate this pipe fitting or ribbed pipe by a predetermined angle around the pipe axis to engage the locking protrusion with the rib of the ribbed pipe, thereby attaching it to the connecting end of the ribbed pipe. It is characterized by connecting pipe joints.

(Function) By engaging the locking protrusion formed on the inner circumferential wall of the socket part of the pipe joint with the rib of the ribbed pipe, it is possible to prevent the ribbed pipe from coming off without the need for any other parts. .

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an example of a pipe joint used in the connection method according to the present invention, and FIG. 2 is a sectional view thereof.

The pipe joint 1 is a cylindrical body having an inner diameter slightly larger than the outer diameter of the ribbed pipe 2 (the outer diameter at the rib 3 portion), and the ribbed pipe 2 is inserted and connected to both ends of the pipe joint 1. It has socket parts 4, 4. These socket parts 4
．． An annular abutment portion 5 with which the tube ends of the ribbed tube 2 abut each other is formed at the boundary between each socket portion 4 .
A pair of locking protrusions 6 that engage with the ribs 3 of the ribbed tube 2 are formed on the inner peripheral wall of the tube 4 symmetrically with respect to the axis. Further, a rotating protrusion 7 is provided on the outer circumferential surface of the central portion of the pipe joint 1 in a protruding manner. The pipe joint 1 configured as described above is molded by injection molding using a synthetic resin material such as polyvinyl chloride, but is not limited thereto, and may be molded from other synthetic resin materials or metal materials. The length of the socket portion 4.4 is determined by the outer diameter of the ribbed tube 2 and the rib 3.
The size and arrangement position of the locking projections 6 are determined as appropriate depending on the height and pinch of the ribs 3 of the ribbed tube 2. It is determined. The number of locking protrusions 6 may be one or three or more, and one of the socket portions 4 may be connected to a pipe of a different type from the ribbed pipe. It may be shaped in such a way that it can be made.

Furthermore, an impregnating medium 8° for impregnating a two-component foaming resin liquid between the abutting portion 5 and each locking protrusion 6 is provided on the inner circumferential wall of the socket portions 4, 4 of the pipe joint 1. 8 is firmly fixed, and its thickness is set to such a height that it does not obstruct insertion of the ribbed tube 2.

A sponge is preferably used as the impregnating medium 8, but other materials such as paper or cloth having water absorbing properties can also be used. Here, the above two-component foamable resin liquid is:
It is a resin liquid that foams with a gas produced by a reaction when two liquids are mixed, and as this resin liquid, for example, a urethane resin liquid, a phenol resin liquid, etc. are suitably used. An example of a preferred composition when using a urethane resin liquid is shown below.

Polyol compound 1.0 parts by weight Polyisocyanate compound 1.3 parts by weight Foaming agent such as water
0.4 to 0.6 parts by weight Tin-based catalyst such as dibutyltin 0.2 parts When using a urethane resin liquid with such a composition, first, mix two liquids of a polyol compound and a polyisocyanate compound ( (Other compositions are mixed in advance with either liquid.) Then, the impregnating medium 8 is impregnated.

The two-component foamable resin liquid described above is a highly fluid liquid with relatively low viscosity, so it can be impregnated into the impregnation medium 8 very easily. In addition, this two-component foaming resin liquid does not foam immediately when the two components are mixed, but starts foaming after a while (about 10 minutes) after mixing, and foams approximately 3 to 4 times more. . In the case of the urethane resin liquid, the foaming start time can be adjusted by adjusting the amounts of the foaming agent and catalyst.

Next, a connection method according to the present invention using the above-mentioned pipe joint 1 will be explained.

First, each rib 3 located at the connection end of the ribbed pipe 2...
As shown in Fig. 3, a pair of protrusion passing portions 9 for passing the locking protrusions 6 of the pipe fitting 1 are formed symmetrically across the pipe axis by cutting partially along the pipe axis. to form.

Next, after impregnating the impregnating medium 8.8 of the pipe fitting 1 with the two-component foaming resin liquid described above, the locking protrusion 6 of one socket part 4 is inserted into the protrusion passage part 9 of the ribbed pipe 2. At the same time, the pipe joint 1 is inserted onto the connecting end of the ribbed pipe 2.

Subsequently, after inserting another ribbed pipe 2 into the other socket part 4 of the pipe joint 1 in the same manner, the pipe joint 1 is rotated by a predetermined angle (approximately 90 degrees in this example) about the pipe axis. Then, engage the locking protrusions 6 of the pipe fitting 1 with the ribs 3, 3 of both ribbed pipes 2.2, respectively, and insert the ribbed pipes 2, 2 into both socket parts 4, 4 of the pipe fitting 1. Connecting. At this time, if the rotation protrusion 7 on the outer peripheral surface of the pipe joint 1 is used, the pipe joint 1 can be rotated without slipping. Note that the connection procedure for connecting the pipe joint 1 and both ribbed pipes 2, 2 is not limited to the one described above. First, connect one of the ribbed pipes 2 to one socket part 4, and then connect the other ribbed pipe 2. The ribbed tube 2 remaining in the section 4 may be connected.

After a while after connecting the ribbed pipes 2, 2 to both socket parts 4° 4 of the pipe joint 1 as described above, the two-component foamable resin impregnated with the impregnating medium 8, 8 starts foaming. As a result, the gaps between the inner circumferential walls of the socket portions 4, 4 of the pipe fitting 1 and each of the ribbed pipes 2 are filled, and the two-component foaming resin liquid is finally cured, and the pipe fitting 1 and both ribbed pipes are 2 are joined with good water-stop properties. This completes the connection work.

In addition, in the above-described embodiment, the socket portion 4 of the pipe joint 1.
An impregnating medium is fixed to the inner circumferential wall of pipe 4, and the medium is impregnated with a two-component foaming resin liquid and foamed and hardened to form a pipe fitting l and a pipe with both ribs 2.
, 2, for example, as shown in FIG. 4, between the ribs 3 of each ribbed pipe 2. A water stop ring 10 made of, for example, rubber or a water-swellable elastic body, which has elasticity at a location further away from the pipe end than the engagement location.
The IO may be fitted in advance so as to be in close contact with the inner circumferential wall of the socket portion 4.4 of the pipe joint 1. Here, the water-swellable elastic material is one that absorbs water and expands when it comes into contact with water, and examples thereof include natural rubber, polybutene, polyisobutylene, polybutadiene rubber, polyisoprene rubber, butyl rubber, SBR, EPDM, I R, NBR, CR, BR or other rubber or elastomer mixed with a special water-absorbing polymer (for example, water-swellable urethane resin), or chloroprene rubber or chlorosulfonated polyethylene mixed with polyisoprene (In this case, for example, 1 part by weight of polyisoprene is blended with 100 parts by weight of chloroprene rubber, and the expansion rate is 1.5. (approximately twice as much) is preferably used.

Further, the abutting portion 5 and the rotating protrusion 7 of the pipe joint 1 do not necessarily need to be provided. Furthermore, although the protrusion passing portion 9 of the ribbed pipe 2 is formed when connected to the pipe fitting 1,
The ribs 3 may be formed in advance during manufacture of the ribbed tube 2, or in that case, the ribs 3 are partially cut along the tube axis over the entire length of the tube, and the tube is cut to an arbitrary length. However, the projection passage portion 9 may be always formed at the end of the tube.

(Effects of the Invention) As explained above, according to the present invention, there is no need for the conventional retaining parts, so it is economical, and the pipe joint can be attached to the ribbed pipe by extrapolating the pipe joint to the ribbed pipe. Since the locking protrusion can be engaged with the rib of the ribbed tube simply by rotating, the connection work can be performed easily, quickly and reliably. Moreover, by engaging the locking protrusion of the pipe joint with the rib, the ribbed pipe is prevented from coming off, so that the ribbed pipe, which was conventionally only used as a low-pressure sewage pipe, can be used for high-pressure, e.g. It can also be used as a pressure pipe for water pipes, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of a pipe joint used in the method for connecting a ribbed pipe and a pipe joint according to the present invention;
3 is a plan view showing the connection end of the ribbed pipe, and FIG. 4 is a sectional view showing another example of the water stop means employed in the connection method according to the present invention.

Claims (1)

[Claims] 1) When connecting a pipe joint having a socket portion to a ribbed tube having a large number of annular ribs on its outer peripheral surface, the inner peripheral wall of the socket portion engages with the ribs of the ribbed tube. A pipe joint in which one or more locking protrusions are formed is prepared, and each rib located at the connection end of the ribbed pipe is partially cut along the pipe axis. A protrusion passing portion is formed for passing the locking protrusion of the pipe joint, and the locking protrusion of the pipe joint is aligned with this protrusion passage portion, and the pipe joint is externally inserted into the connection end of the ribbed pipe. The pipe joint or the ribbed pipe is rotated at a predetermined angle around the pipe axis to engage the locking protrusion with the rib of the ribbed pipe, thereby connecting the pipe joint to the connection end of the ribbed pipe. How to connect ribbed pipes and pipe fittings.