JPS5831022Y2 - Pipe fittings for propulsion method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe joint for a propulsion method, and particularly relates to a pipe joint for a propulsion method pipe for applying the propulsion method to relatively small diameter pipeline facilities.

In the thrust method, a pipe is pushed into the ground, and pipes are successively added to the pushed pipe to form a conduit. It is required to be able to transmit thrust, and to avoid phantom bending between the socket and the socket in order to form the desired conduit.

□ Conventionally, for large-diameter propulsion method pipes, this requirement was met by attaching a flange fixed to the outer periphery of the socket to the tip of the socket and bolting the two together. Not only does it take a lot of man-hours to manufacture the pipe, but it also takes a lot of man-hours to bolt it together.

If this configuration is adopted for a propulsion method with a small diameter of about 500 to 600 mm, it will require unnecessary expense and academic ability.

The purpose of the present invention is to provide a pipe joint for the propulsion method that can solve the problems associated with the present invention. It is attached to the socket at the end and the inner peripheral surface of the socket, and its inner periphery is press-fitted to the outer periphery of the socket.

A sealing material is provided, and a tapered surface that becomes larger in diameter toward the opening of the socket and on which the tip of the socket can come into contact is formed at the rear end of the socket at an appropriate distance from the opening of the socket, and With the tip of the socket in contact with the tapered surface, wedges are provided at multiple locations in the circumferential direction between the inner circumference of the socket tip and the outer circumferential surface of the socket, and are welded to the socket tip surface. One embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a propulsion method pipe, which consists of a pipe body 1a made of a cast iron pipe and an exterior reinforced concrete layer 1b integrally attached to the outer peripheral surface of the pipe body. A mentomortar lining layer 1c is formed.

One end of the pipe 1 is provided with an insertion port 2 over a considerable length without forming an exterior reinforced concrete layer 1b, and the other end is formed with a socket 3 through which the insertion port 2 is inserted and the pipes 1 are connected to each other. There is.

An annular groove 4 is formed in the inner circumferential surface 3a of the socket, and an O-ring 5 as a sealing material is fitted into the annular groove 4.
The inner periphery of the socket 3 is in pressure contact with the outer peripheral surface of the socket 2, thereby sealing the space between the socket 3 and the socket 2.

A socket rear end surface 7 that connects the socket inner peripheral surface 3a and the tube inner peripheral surface 6 at the rear end of the socket 3 is formed into a tapered surface whose diameter increases toward the socket opening side. The outer periphery of the tip of the socket 2 is in contact at position A.

On the other hand, the inner periphery of the tip 3b of the socket 3 is suitably tapered or chamfered 8 with an external wave, and there are multiple locations in the circumferential direction between this internal tapered surface 8 and the outer peripheral surface of the socket 2. A wedge 9 having a width of 2 to 3 cm is driven into the hole, and is fixed to the tip end face 3b of the socket by welding 10 to ensure that the wedge 9 is prevented from coming out.

Therefore, position B where the socket tip surface 3b and the socket outer circumferential surface intersect
Also, the socket 3 and the socket 2 are fixed.

In this way, the receptacles 3 and 2 are fixed to each other at position A of the tip of the receptacle and position B of the tip of the receptacle, so that no bending occurs between the receptacles.

It should be noted that the longer the distance {circle around (2)} between the A position and the B position, the stronger the resistance against bending will be, even if the force applied to the contact point is small.

The length of the button and socket 2 needs to be the sum of the distance between A and B mentioned above and the distance required to drive the wedge 9.

When joining the pipes, fit the sealing material 5 into the annular groove 3 of the socket 3, then insert the socket 2 into the socket 3 with a dowel so that the tip of the socket 2 comes into contact with the tapered surface 7, and then press the inside of the socket tip. A plurality of wedges 9 may be driven between the circumferential tapered surface 8 and the outer circumferential surface of the socket 2 at appropriate intervals in the circumferential direction and fixed to the front end surface of the socket by welding 10.

In this way, the thrust force during tube propulsion is transmitted through contact between the tip end surface of the insertion port and the back end surface of the socket, and the bending of the joint during tube propulsion occurs over a distance of 1.
This is prevented by the presence of fixed points A and B.

The combination of the annular groove 4 and the sealing material 50 is not limited to the illustrated groove with a rectangular cross section and an O-ring, but various modifications such as a Titon-shaped rubber ring and an annular groove with a corresponding cross-sectional shape are possible. It is possible.

As described above, according to the pipe joint for the propulsion method of the present invention,
The tip of the socket contacts the tapered surface at the back end of the socket, a wedge is driven between the inner circumference of the socket tip and the outer circumferential surface of the socket, and the wedge is welded to the top surface of the socket. Since the socket and the socket are fixed at two positions separated by a distance, there is no bending between the socket and the socket, and the necessary pushing thrust can be reliably transmitted, and the structure is simple. It is highly economical and easy to work with.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] A socket at one end of the pipe that does not form an exterior material layer, a socket at the other end of the pipe into which the socket is inserted and connected, and a socket that is attached to the inner peripheral surface of the socket and whose inner periphery is the outer periphery of the socket. A tapered surface that increases in diameter toward the opening of the socket and can be contacted by the tip of the socket is placed at the back end of the socket at an appropriate distance from the opening of the socket. With the tip of the socket in contact with the tapered surface, it is driven into multiple locations in the circumferential direction between the inner periphery of the socket tip and the outer circumferential surface of the socket, and is welded to the tip surface of the socket. A pipe joint for the propulsion method that is characterized by the provision of a wedge.