JPH0434237Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a pipe joint for a propulsion method.

[Prior Art] A propulsion method is one method for burying sewer pipes, water purification pipes, cable protection pipes, etc. underground. In this propulsion method, as shown in Fig. 5, a first propulsion tube 3a is joined to a warhead-shaped leading tube 2 that propels the underground 1, and the propulsion tube 3a is pushed by a jack 4 to be driven underground. Press fit. A second propulsion pipe 3b is connected to the propulsion pipe 3a press-fitted into the ground as described above via a pipe joint 5, and the propulsion pipe 3b is again pressed by the jack 4 to be press-fitted into the ground. By sequentially repeating this operation, it becomes possible to bury the required number of pipes underground. The jack 4 is installed inside a shaft or the like.

By the way, as a pipe joint for the conventional propulsion method,
The ones shown in FIGS. 3 and 4 have been proposed.

The pipe joint 5A shown in FIG. 3 has an annular rib 6 on the inner circumferential surface of the intermediate portion sandwiched between the end on the propulsion direction and the end on the counterpropulsion direction of the joint body, with which the insertion ends of the propulsion tubes 3a and 3b abut. A tapered inner diameter portion 7 is provided, and the inner circumferential surfaces of the propulsion direction side end portion and the counterpropulsion direction side end portion expand in a tapered shape toward their open ends.
A, 7B.

In addition, the pipe joint 5B shown in FIG.
It is described in Publication No. 60-144697,
The outer circumferential surface of the end of the joint body in the propulsion direction is formed into a tapered outer diameter portion 8 that decreases in diameter toward the open end, and the propulsion tubes 3a, 3b and the joint body are welded together.

[Problems to be solved by the invention] However, the pipe joint 5A shown in FIG.
In this case, the propulsion tubes 3a and 3b have tapered inner diameter portions 7A and 7B that open in a lattice shape at both ends of the joint body.
inserted through a wedge-shaped gap. Therefore,
When a propulsion force acts on the propulsion tubes 3a, 3b, there is a risk that earth and sand may dig into the inner surfaces of the tapered inner diameter portions 7A, 7B, or that the propulsion tubes 3a, 3b may be misaligned vertically and horizontally with respect to the pipe joint 5A. .

Furthermore, since the pipe joint 5B shown in FIG. 4 is not provided with the annular rib 6 unlike the pipe joint 5A, the propulsive force acting on the propulsion pipes 3a, 3b is transmitted to the propulsion pipes 3a, 3b. It acts directly on the welded part with the joint body, and there is a risk that the welded part will peel off.

An object of the present invention is to provide a pipe joint for a propulsion method that allows the end of a propulsion pipe to be inserted and held securely.

[Means for Solving the Problems] The present invention provides a pipe joint for a propulsion method in which the end of a propulsion pipe is inserted and held in each of the propulsion direction end and the counterpropulsion direction end of the joint body. An annular rib on which the insertion end of the propulsion tube comes into contact is provided on the inner peripheral surface of the intermediate portion sandwiched between the end on the propulsion direction and the end on the counterpropulsion direction, and each of the end on the propulsion direction and the counterpropulsion direction The inner circumferential surface has a tapered inner diameter portion whose diameter increases toward the open end thereof, and the inner diameter of each open end of the end on the propulsion direction and the end on the counterpropulsion direction is made equal to the outer diameter of the propulsion tube. , and at least the outer circumferential surface of the end on the propulsion direction side is formed into a tapered outer diameter portion that decreases in diameter toward the open end.

[Function] According to the present invention, the end of the propulsion tube can be relatively easily and easily connected to the tapered inner diameter portion provided at the end on the propulsion direction and the end on the counterpropulsion direction of the joint body. They are joined by being press-fitted without intervening. Therefore, when a propulsion force acts on the propulsion tube, there is no possibility that dirt will dig into the tapered inner diameter portion of the joint body, and the propulsion tube will not be misaligned vertically or horizontally with respect to the joint body.

Further, the propulsion tube press-fitted into the joint body is buried with its insertion end in contact with an annular rib provided on the inner circumferential surface of the intermediate portion of the joint body. Therefore, the propulsive force acting on the propulsion tube is supported by the annular rib of the joint body, and the joint between the propulsion tube and the joint body is not destroyed by the action of the propulsion force.

That is, according to the present invention, it becomes possible to insert and hold the propulsion tube reliably.

[Embodiment] FIGS. 1A to 1C are cross-sectional views showing an embodiment of the present invention.

In Figures 1A to C, 10 is a synthetic resin pipe joint such as hard vinyl chloride, 11 is the joint body, and 12 is a pipe joint made of synthetic resin such as hard vinyl chloride.
A is the end of the joint body 11 in the propulsion direction, and 12B is the end of the joint body 11 in the counter-propulsion direction.
0, the propulsion pipe 21 is attached to each of the propulsion direction side end 12A and the counterpropulsion direction side end 12B of the joint body 11.
Insert and hold the ends of a and 21b. Here, the propulsion direction side end 12A and the counterpropulsion direction side end 12B are as follows:
Their inner circumferential surfaces are tapered inner diameter portions 13A, 13B whose diameter increases toward their open ends.

The joint main body 11 shown in FIG.
The insertion end portions a and 21b are provided with an annular rib 14 that comes into contact with each other when the press-fitting is completed as shown in FIG. 1B. La and Lb in FIG. 1A represent the propulsion tube 21a,
21b is the length of both ends of the joint main body 11 before processing, which is inserted without being press-fitted.

In the joint body 11 of this embodiment, the above-mentioned La portion on the side of the end 12A in the propulsion direction is cut off using a pipe cutter, and the outer circumferential surface of the end 12A on the propulsion direction after cutting is cut off with a pipe beveling machine. It has a tapered outer diameter portion 15A that decreases in diameter toward the open end.

In other words, the pipe fitting 10 has an inner surface of the propulsion direction side end 12A of the fitting body 11 that is a tapered inner diameter portion 13A that expands in diameter toward its open end, and the inner diameter of the open end of the propulsion direction side end 12A after the above-mentioned La portion is cut off is made equal to the outer diameter of the propulsion pipe 21a, and the outer peripheral surface of the propulsion direction side end 12A is a tapered outer diameter portion 15A that contracts in diameter toward its open end.

In addition, in the joint body 11 of this embodiment,
The inner diameter part of the above-mentioned Lb part on the side of the opposite end 12B in the direction of propulsion is formed into a fitting hole part 16 by lathe processing, and a short part such as the La part cut off from the end 12A in the direction of propulsion is cut off. The pipe is lathed to form a fitting cylinder part 17, and the fitting cylinder part 17 is fitted into the fitting hole part 16. Further, the outer circumferential surface of the fitting cylinder portion 17 is formed into a tapered outer diameter portion 15B which decreases in diameter toward the open end by a pipe chamfering machine.

That is, in the pipe joint 10, the inner peripheral surface of the opposite end 12B in the opposite propulsion direction of the joint body 11 has a tapered inner diameter part 13B whose diameter increases toward the open end, and the inner peripheral surface of the opposite end 12B in the opposite thrust direction The inner diameter of the open end is made equal to the outer diameter of the propulsion tube 21b, and the outer peripheral surface of the opposite end 12B in the opposite propulsion direction is formed into a tapered outer diameter portion 15B that decreases in diameter toward the open end.

Note that the chamfer angle θ of the tapered outer diameter portions 15A and 15B is appropriately about 25 degrees.

Next, the operation of the above embodiment will be explained.

According to the pipe joint 10, the propulsion pipes 21a, 21
The end b is the end 12 of the joint body 11 in the propulsion direction.
In the tapered inner diameter portions 13A and 13B provided at each of the end portion A and the counter-propulsion direction side end portion 12B,
It is press-fitted relatively easily and without any gaps, and is joined using an adhesive. Therefore, when a propulsive force acts on the propulsion tubes 21a, 21b, the tapered inner diameter portions 13A, 13 of the joint body 11
If dirt or sand gets into B, the propulsion pipes 21a, 21b
There is no possibility of misalignment in the vertical and horizontal directions with respect to the joint body 11.

Further, according to the pipe joint 10, the joint body 11
The propulsion tubes 21a and 21b to be press-fitted are buried with their insertion ends in contact with the annular rib 14 provided on the inner peripheral surface of the intermediate portion of the joint body 11. Therefore, the propulsive force acting on the propulsion tubes 21a, 21b is supported by the annular rib 11 of the joint body 11, and the joint between the propulsion tubes 21a, 21b and the joint body 11 is destroyed by the action of the propulsion force. Never.

That is, according to the pipe joint 10, the propulsion pipe 2
It becomes possible to insert and hold the ends of 1a and 21b reliably.

Note that the pipe joint 10 has an end portion 12 on the propulsion direction side.
A, since the tapered outer diameter portions 15A and 15B have been chamfered on both the opposite end portions 12B, the pipe fitting 10 in FIG. 1B is reversed as shown in FIG. 1C,
It is also possible to use the side on which the fitting cylinder part 17 is fitted as the end on the propulsion direction side.

Further, as shown in FIG.
Without chamfering the tapered outer diameter portion 15B, the tapered outer diameter portion 15A is formed on the propulsion direction side end 1.
It may be provided only on the 2A side.

Further, in the above embodiment, the pipe joint 10 is made up of two components, the joint main body 11 and the fitting cylinder part 17, but the pipe joint 10 is formed integrally by means such as injection molding. It's okay to be angry.

[Effects of the invention] As described above, the present invention provides a pipe joint for a propulsion method in which the ends of the propulsion pipe are inserted and held in the propulsion direction side end and the counterpropulsion direction side end of the joint body, respectively.
An annular rib that the insertion end of the propulsion tube comes into contact with is provided on the inner peripheral surface of the intermediate portion between the propulsion direction side end and the counterpropulsion direction side end of the joint body, and the propulsive direction side end and the counterpropulsion direction side end are provided. Each of the inner peripheral surfaces of the tube has a tapered inner diameter part whose diameter increases toward the open end thereof, and the inner diameter of each open end of the propulsion direction side end and the counterpropulsion direction side end is the outer diameter of the propulsion tube. and at least the outer circumferential surface of the end on the propulsion direction side has a tapered outer diameter that decreases in diameter toward the open end. Therefore, it becomes possible to insert and hold the end of the propulsion tube reliably.

[Brief explanation of the drawing]

1A to 1C are cross-sectional views showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a modified example of the present invention, and FIG.
The figure is a sectional view showing a conventional example, FIG. 4 is a sectional view showing another conventional example, and FIG. 5 is a schematic diagram showing a propulsion method. 10...Pipe joint, 11...Joint body, 12A...
...Propulsion direction side end, 12B...Counterpropulsion direction side end, 13A, 13B...Tapered inner diameter part, 14...
...Annular rib, 15A, 15B...Tapered outer diameter portion, 21a, 21b...Propulsion tube.

Claims (1)

[Scope of utility model registration request] In a pipe joint for the propulsion method in which the end of the propulsion pipe is inserted and held in the propulsion direction end and the counterpropulsion direction side end of the joint body, An annular rib is provided on the inner circumferential surface of the sandwiched intermediate portion, with which the insertion end of the propulsion tube comes into contact, and the inner circumferential surfaces of the propulsive direction side end and the counterpropulsive direction side end are enlarged in diameter toward their open ends. In addition to having a tapered inner diameter, the inner diameter of each open end of the propulsive direction end and the counterpropulsive direction end is made equal to the outer diameter of the propulsion tube, and at least the outer peripheral surface of the propulsive direction end is made equal to the outer diameter of the propulsion tube. A pipe joint for propulsion construction, characterized by having a tapered outer diameter portion that decreases in diameter toward the open end.