JPH03467Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to pipes for use in propulsion construction methods.

The propulsion method is often used in places where it is not possible to excavate the ground and lay a pipe, such as across tracks, rivers, roads, or in urban areas with heavy traffic. By the way, pipes for the propulsion method generally have a socket and an inlet.
The outer diameter of the socket is larger than that of the pipe body, so in order to reduce the resistance during propulsion, the purpose was to align the outer diameter of the pipe body with the outer diameter of the socket. , An exterior concrete layer is formed around the outer periphery of the pipe body.

FIG. 2 shows a cross section of the main parts of a conventional propulsion method pipe, where 1 is a socket and 2 is a pipe body. An exterior concrete layer 4 containing reinforcing bars 3 is formed on the outer periphery of the pipe body 2, and the outer diameter of this exterior concrete layer 4 is equal to that of the socket 1.
It is aligned with the outer diameter of. However, when a pipe for use in such a propulsion method is propelled underground, there is a problem in that the outer concrete layer 4 is likely to be displaced due to the force in the axial direction due to the frictional force caused by the earth and sand. Moreover, in particular, since the pipe body 2 and the socket 1 are continuous at the taper part 5 which tapers in the direction of propulsion, when the force in the axial direction acts on the taper part 5, the taper part 5 There is a problem in that the exterior concrete layer 4 tends to lift up in the radial direction.

Therefore, the object of the present invention is to prevent the occurrence of displacement of the exterior concrete layer in the axial direction, and in particular to reliably prevent the exterior concrete layer from lifting up in the radial direction at the tapered portion.

In order to achieve this purpose, the present invention has developed a tapered tube that has a socket formed at one end and an insertion port formed at the other end, and whose diameter gradually increases toward the outer periphery of the portion from the pipe body toward the socket. In a pipe for the propulsion method in which a section is formed and an exterior concrete layer is formed on the outer periphery of the pipe body, the concrete is embedded in the exterior concrete layer on the outer periphery of the pipe at a position extending from the pipe body to the socket, and during propulsion. A stopper is fixed to prevent the exterior concrete layer from shifting in the axial direction and lifting up in the radial direction at the tapered portion due to the frictional force caused by the earth and sand.

Therefore, even if an axial force is applied to the exterior concrete layer due to the frictional force caused by the earth and sand,
The stopper ring can absorb this axial force and prevent the exterior concrete layer from shifting in the axial direction. In addition, since the stopper ring is fixed to the outer periphery of the pipe at the position where it extends from the pipe body to the socket, it is possible to reliably prevent the force in the axial direction from acting on the tapered part from the pipe body to the socket. It is possible to effectively prevent the exterior concrete layer from lifting in the radial direction.

An embodiment of the present invention will be described below. FIG. 1 shows an embodiment of a pipe for use in the propulsion method according to the present invention, in which a socket 1 is formed at one end, and a socket 6 is formed at the other end. 7 is a cement mortar lining formed on the inner surface of the tube. A flange 10 with a bolt hole 9 reinforced with ribs 8 is fixed to the outer periphery of the socket 6, and a bolt passing through the bolt hole 9 is screwed into a tap hole 11 formed in the socket 1 of an adjacent pipe. By doing so, these adjacent tubes are connected to each other. An exterior concrete layer 4 containing reinforcing bars 3 is formed on the outer periphery of the pipe body 2, and the outer diameter of this exterior concrete layer 4 is aligned with the outer diameter of the socket 1.

A stopper ring 12 is externally fitted and fixed on the outer periphery of the tube at a position extending from the tube body 2 to the socket 1. That is, the stopper ring 12 has a rectangular cross section and is continuous or divided in the circumferential direction,
It is temporarily welded at the position where it hits the tapered part 5.
The height of the stopper ring 12 is set to 30% to 50%, preferably about 35%, of the thickness of the exterior concrete layer 4, so that when pouring concrete, the concrete can be well circulated near the outer periphery of the tapered part 5. has been done.

Note that an adhesive 13 is applied to the surfaces of the tapered portion 5 and the stopper ring 12, and this adhesive 13
The concrete is strongly fixed.

When manufacturing pipes for this type of propulsion method,
First, the stopper ring 12 is fitted onto the shown position and temporarily welded. The welding location may be on both sides or one side of the ring 12. As for the assembly procedure, in order to easily attach the stopper ring 12, it is preferable to attach the flange 10 to the insertion port 6 after the stopper ring 12 is fitted onto the outside. Thereafter, as shown in the figure, adhesive 13 is applied, reinforcing bars 3 are set, and concrete is poured to form an exterior concrete layer 4.

As described above, according to the present invention, even if a force in the axial direction of the exterior concrete layer 4 acts on the exterior concrete layer 4 due to the frictional force caused by the earth and sand, this force in the axial direction can be absorbed by the stopper ring 12, and the exterior concrete layer 4 can be prevented from shifting in the axial direction. In addition, since the stopper ring 12 is provided at a position extending from the pipe body 2 to the socket 1, the taper portion 5
It is possible to reliably prevent the above-mentioned force in the axial direction from acting on the area, and to effectively prevent the exterior concrete layer 4 from lifting up in the radial direction in this area. In the above embodiment, the stopper ring 12 is fixed at a position that corresponds to the taper part 5, but it may be fixed at a position a certain distance from the taper part 5 as long as it is in a position where no harmful axial force is applied to the taper part 5. There is no problem even if it is.

Furthermore, by applying the adhesive 13 as in the above embodiment, the exterior concrete layer 4 can be reliably fixed to the tapered part 5 and the stopper ring 12, and displacement and lifting of the outer concrete layer 4 can be more effectively prevented. can.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view of the main parts of a conventional example. 1...Socket, 2...Pipe body, 4...Exterior concrete layer, 5...Tapered part, 6...Socket, 12...
...stopper ring, 13...adhesive.

Claims (1)

[Scope of utility model registration request] A socket is formed at one end, a socket is formed at the other end, and a tapered part whose diameter gradually increases toward the socket is formed on the outer periphery of the portion from the pipe body toward the socket, In pipes for the propulsion method in which an exterior concrete layer is formed around the outer periphery of the pipe body, the concrete layer is embedded in the exterior concrete layer on the outer periphery of the pipe at a position extending from the pipe body to the socket, and is used to prevent frictional forces caused by earth and sand during propulsion. A pipe for a propulsion method, characterized in that a stopper ring is fixed to prevent the exterior concrete layer from shifting in the axial direction and lifting up in the radial direction at the tapered part.