JPH08200574A - Universal coupling and attaching structure for it - Google Patents

Abstract

PURPOSE: To facilitate bending of a piping, so as to provide a universal joint capable of withstanding earth pressure in burying, by attaching a plurality of hard and annular rings having the inside diameters a little larger than the outside diameter of a flexible pipe on the outer periphery of the flexible pipe. CONSTITUTION: A flexible pipe 2 on which a plurality of annular rings 3 are attached is bent to the specified curvature, connecting pipes 4, 4 made of polyethylene are inserted into both ends of the flexible pipe 2, connected to each other, fixed by being fastened by hose bands 5, 5, buried in the excavated land, and used for a sewerage piping after earth and sand are returned to the land. Since the universal joint 1 structured by this way uses the flexible pipe 2, bending of a piping is easy, and since many hard and annular rings 3 having the inside diameters a little larger than the outside diameter of the flexible pipe 2 are attached on the other periphery of the flexible pipe 2, the annular rings 3 support the earth pressure in burying, and the flexible pipe 2 is prevented from being closed caused by buckling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint and its mounting structure, and more particularly to a universal joint suitable for vacuum sewer piping and its mounting structure.

[0002]

2. Description of the Related Art Conventionally, as a universal joint used for connecting vacuum type sewer pipes, it is known and described in Japanese Patent Application Laid-Open No. 5-203084. The universal joint described in the above publication,
This is a universal joint in which a rigid polyethylene pipe on both sides and a flexible rubber pipe in the central part are integrated, and bending pipes are easy and have a high airtight structure.

[0003]

However, in the conventional universal joint described in the above publication, since the flexible rubber pipe is used in the central portion, when buried, it is deformed by earth pressure and buckled, and the pipe is blocked. There is a fear. Also,
In order to integrate the polyethylene pipe and the flexible rubber pipe into one body to improve the airtightness, the polyethylene pipe and the flexible rubber pipe are connected by a connecting pipe, and the resin made by resin injection molding is further formed on the outer peripheral surface of this connecting portion. Since the joint portion is formed, there is a problem that the structure is complicated and it takes a lot of time to manufacture, so that the cost becomes high.

The present invention has been made in order to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide a universal joint in which bent pipes are easy and can withstand earth pressure during burial. Is to provide. Another object of the present invention is to provide a simple universal joint mounting structure that is easy to bend and can withstand earth pressure during burial, and that is highly airtight.

[0005]

The present invention has been made to achieve the above object, and the invention of claim 1 is such that the outer circumference of the flexible pipe is slightly larger than the outer diameter of the flexible pipe. The universal joint is characterized in that a plurality of hard annular rings having an inner diameter are mounted.

According to a second aspect of the present invention, a rigid short tube having an outer diameter substantially the same as the inner diameter of the flexible pipe is inserted into the inner circumference of the flexible pipe end portion of the universal joint according to the first aspect, and the end of the flexible pipe is inserted. The end portion of the connecting pipe is abutted against the portion, and the outer peripheral surface of the flexible pipe having the short pipe provided on the inner periphery and the outer peripheral surface of the connecting pipe are fastened and connected by a split coupling joint. Is a universal joint mounting structure.

As the flexible tube used in the present invention, a tube made of a soft synthetic resin such as plasticized vinyl chloride resin or low density polyethylene, or a tube made of rubber can be preferably used. The material of the hard annular ring may be metal or hard synthetic resin.
Although this annular ring is attached to the outer circumference of the flexible tube, the annular rings can be used by connecting them with each other with a string-like member in order to prevent uneven insertion. Also,
In order to prevent the annular ring from moving and being displaced at the time of construction, a stopper for preventing movement may be provided on the outer circumference of the flexible pipe.

[0008]

In the universal joint according to the first aspect of the present invention, since the flexible winding is used, bending piping is easy, and a hard annular ring having an inner diameter slightly larger than the outer diameter of the flexible pipe is provided on the outer periphery of the flexible pipe. Since a plurality of them are mounted, they do not support the earth pressure during burial and the flexible winding is not buckled and closed.

The universal joint mounting structure according to claim 2 is
Since a rigid short tube having an outer diameter substantially the same as the inner diameter of the flexible tube is inserted into the inner circumference of the end of the flexible tube according to claim 1, the flexible tube is crushed even when the flexible tube is tightened with a coupling joint. There is no such thing. Also,
The end of the connecting pipe is butted against the end of the flexible pipe,
Because the outer peripheral surface of the flexible pipe where the end pipe is provided is tightened with a split type coupling joint,
The ends of the butted flexible pipes are compressed and closely adhere to the ends of the connecting pipe, so that airtightness is maintained.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an embodiment of the present invention and is a partially cutaway plan view showing a usage state of a universal joint. FIG. 2 is a partially cutaway sectional view showing another universal joint mounting structure according to the present invention.

First, an embodiment of the present invention will be described with reference to FIG. 1 is a universal joint, 2 is a flexible pipe, 3 is an annular ring, 4 is a connecting pipe, and 5 is a hose band. This universal joint 1 is a hard vinyl chloride resin having an inner diameter slightly larger than the outer diameter of the flexible pipe 2 on the outer circumference of a flexible pipe 2 made of a soft vinyl chloride resin (outer diameter 100 mm, wall thickness 5 mm, length 290 mm). Ring 3 made of steel
A large number (16 pieces) of (inner diameter 102 mm, wall thickness 8 mm, width 10 mm) are mounted.

This universal joint 1 is constructed by bending the flexible pipe 2 having the annular rings 3 and 3 attached thereto into a predetermined curvature and inserting the polyethylene connecting pipes 4 and 4 into both ends of the flexible pipe 2. It is fixed by tightening the connectives and hose bands 5 and 5, buried in the excavated soil, and finally backfilled with earth and sand for use in sewer piping.

Since the universal joint 1 of the present embodiment constructed as described above uses the flexible pipe 2, bending piping is easy, and the outer circumference of the flexible pipe 2 is larger than the outer diameter of the flexible pipe 2. Since a large number of hard annular rings 3 and 3 having slightly larger inner diameters are mounted, the annular rings 3 and 3 support earth pressure at the time of burying, and the flexible pipe 2 does not buckle and close.

Next, another embodiment of the present invention will be described with reference to FIG. The universal joint 1 of this embodiment is the same as the universal joint 1 shown in the embodiment of FIG. 1, and the flexible pipe 2 is attached to the inner circumference of the end of the flexible pipe 2 of the universal joint 1.
A short tube 6 made of stainless steel and having an outer diameter substantially the same as the inner diameter (90 mm) is inserted.

The end of the flexible pipe 2 is abutted with the end of a polyethylene connecting pipe 7 having the same outer diameter (100 mm) as the outer diameter of the flexible pipe 2, and a short pipe 6 is provided on the inner circumference. The outer peripheral surface of the flexible pipe 2 and the outer peripheral surface of the connecting pipe 7 are tightened and connected by a split coupling coupling 8. When the coupling joint 8 is attached, a sheet-like rubber packing 9 is wound around the outer peripheral surfaces of the end portions of the flexible pipe 2 and the connecting pipe 7, and the coupling joint 8 is placed over the rubber packing 9.
Is attached.

In the method of constructing the universal joint 1 described above, the end pipe 6 is inserted into the inner circumference of the end of the flexible pipe 2 on which a large number of annular rings 3 and 3 are mounted, and the flexible pipe 2 has a predetermined curvature. To bend. This bent flexible tube 2
Butt up the end with the connecting pipe 7. A sheet-like rubber packing 9 is wound around the outer peripheral surfaces of the butted flexible pipe 2 and the connecting pipe 7, and a coupling joint 8 is attached from above the rubber packing 9, and the split coupling coupling 8 is tightened. The coupling joint 8 is brought into close contact with the outer peripheral surfaces of the flexible pipe 2 and the connecting pipe 7. In this way, the universal joint 1 to which the connecting pipe 7 is connected is buried in the soil excavated in advance, and the earth and sand are backfilled to complete the construction.

In the mounting structure of the universal joint 1 of the above-mentioned embodiment, the flexible short pipe 6 (made of stainless steel pipe) having the outer diameter substantially the same as the inner diameter of the flexible pipe 2 is provided on the inner circumference of the end portion of the flexible pipe 2.
Is inserted, the flexible tube 2 will not be crushed even if the flexible tube 2 is tightened by the coupling joint 8. In addition, the end of the connecting pipe 7 is abutted against the end of the flexible pipe 2, and the outer peripheral surface of the flexible pipe 2 and the outer peripheral surface of the connecting pipe 7 in which the short pipe 6 is provided on the inner periphery are split type couplings. Since the joints 8 are tightened, the short portions of the butted flexible pipes 2 are compressed and deformed to come into close contact with the end portions of the connection pipes 7, and the airtightness of the connection portions is maintained.

Furthermore, the flexible pipe 2 and the connecting pipe 7
Since the rubber packing 9 is wound around the outer peripheral surface of the end of the and the coupling joint 9 is tightened from above the rubber packing 9, the airtightness of the connecting portion between the flexible pipe 2 and the connecting pipe 7 is further enhanced. There is.

[0019]

In the universal joint according to the first aspect of the present invention, since the flexible pipe is used, it is easy to bend the pipe, and since a plurality of hard annular rings are inserted around the outer periphery of the flexible pipe, the universal joint is buried in the soil. Even if it is done, the flexible pipe does not buckle and block due to earth pressure, and it can be safely used for vacuum sewer piping.

According to a second aspect of the present invention, there is provided a universal joint mounting structure, in which a rigid short tube is inserted into an inner circumference of an end of a flexible tube, a short section of a connecting tube is butted to a short section of the flexible tube, and the flexible tube is fastened with a coupling joint. Connected and connected,
The airtightness of the connecting portion between the flexible pipe and the connecting pipe can be increased relatively easily as compared with the prior art, which is economical.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a use state of a universal joint according to an embodiment of the present invention.

FIG. 2 is a partially cutaway cross-sectional view showing a universal joint mounting structure according to another embodiment of the present invention.

[Explanation of symbols]

 1 Universal joint 2 Flexible pipe 3 Annular ring 4, 7 Connection pipe 6 Short pipe 8 Coupling joint

Claims (2)

[Claims] 1. A universal joint characterized in that a plurality of hard annular rings having an inner diameter slightly larger than the outer diameter of the flexible pipe are mounted on the outer periphery of the flexible pipe. 2. A flexible short tube having an outer diameter substantially the same as the inner diameter of the flexible pipe is inserted into the inner circumference of the flexible pipe end portion of the universal joint according to claim 1, and the flexible pipe has an end portion of the connecting pipe. Of the universal joint, the ends are abutted and the outer peripheral surface of the flexible pipe having the short pipe provided on the inner periphery and the outer peripheral surface of the connecting pipe are tightened and connected by a split type coupling joint. Mounting structure.