JPH0396787A - Pipe for propulsive method - Google Patents

Abstract

PURPOSE:To facilitate the mutual alignment of steel plates by providing a ring step part for engaging facing plates on the faucet part outer circumference of a core pipe, fitting the one-side facing plate disposed on the core pipe in the other-side facing plate, and providing a protruding part engaged with the end part of the one-side facing plate on the other-side facing plate. CONSTITUTION:A cast iron pipe 11 of core pipe has a faucet part 12 on one end and an inserting part 13 on the other end. The faucet part 12 has a step part 14 on the outer surface peripheral part, and the cast iron pipe 11 has an facing concrete 15 on the outer circumference. The facing concrete 15 has steel plates 16, 17 of facing plates on the circumference, the arrangement being such that one-side steel plate 16 is fitted in the other-side steel plate 17. A protruding part 18 is formed on the other-side steel plate 17, and engagingly locked with the one-side steel plate 16. The other end part of the one-side steel plate 16 is engagingly locked with the step part of the faucet part 12. Consequently, the mutual alignment of the steel plates can be easily conducted, and displacement of the facing plate can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a propulsion method pipe that is laid in the ground by a propulsion method.

BACKGROUND OF THE INVENTION Conventionally, there is a propulsion method pipe as a pipe used for laying sewage pipes and the like underground. this is,? As shown in FIG. 6, an exterior concrete 2 was applied to the outer periphery of a cast iron pipe 1, and the outer periphery of the exterior concrete 2 was further covered with a steel plate 3. In the conventional propulsion method pipe, the steel plate 3 is formed into a cylindrical shape, a plurality of steel plates 3 are arranged around the cast iron pipe 1 so as to partially overlap the entire length of the cast iron pipe, and then the steel plate 3 and the cast iron It was formed by pouring exterior concrete 2 between pipes 1.

Problems to be Solved by the Invention However, in the conventional configuration described above, when the cylindrical steel plates 3 are arranged around the cast iron pipe 1, the positions of the steel plates 3 in the axial direction of the cast iron pipe 1 are There was a problem that it took a lot of time to match. Furthermore, while the pipe is being propelled into the soil, a frictional force F■ between the steel plate 3 and the soil acts in the axial direction of the cast iron pipe 1. If the friction force exceeds F1, there is a problem in that the steel plate 3 shifts position on the exterior concrete 2.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a pipe for the propulsion method that allows easy alignment of steel plates and prevents misalignment in the axial direction of the cast iron pipe. do.

Means for Solving the Problems In order to solve the above problems, the present invention provides a pipe for a propulsion method in which an exterior concrete is provided on the outer periphery of a core pipe, and a plurality of exterior plates are provided surrounding the outer periphery of the exterior concrete. An annular step is provided on the outer periphery of the socket of the core tube to engage the exterior plate in the tube axis direction, and one side of the exterior plate located on the socket side of the core tube and the other side located on the push-in part side are provided. Provided by fitting inside the exterior plate of
The exterior plate on the other side is provided with a protrusion that engages with the end of the exterior plate on one side.

Effect With the above-mentioned configuration, when placing the exterior plate around the core pipe before pouring exterior concrete, one side of the exterior plate placed on the socket side of the core pipe is formed into a cylindrical shape. The outer plate on one side is locked in the direction of the tube axis by the stepped portion provided on the outer periphery of the socket portion of the core tube. Then, push the other side of the outer sheathing plate placed on the insertion port side of the core tube from the insertion part side of the core tube, and use the protrusion provided on the other side of the outer sheathing plate to attach the other side of the outer sheathing plate to the end of the one side of the outer sheathing plate. Lock the side exterior plate.

Then, in this state, exterior concrete is placed between the exterior plate and the core pipe to form a pipe for the propulsion method. Therefore, the steel plates can be easily aligned with each other.

Furthermore, while being propelled into the soil, the frictional force generated between the soil and the exterior plate is absorbed by the stepped portion of the socket, thereby preventing the exterior plate from shifting relative to the exterior concrete.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In FIGS. 5 to 5, a cast iron pipe 11 forming a core pipe has one end formed into a socket l2 and the other end formed into a push opening l3.
is formed. An annular stepped portion l4 is formed on the outer peripheral edge of the socket portion 12, and an exterior concrete l5 is provided on the outer periphery of the cast iron pipe 11. Further, around the exterior concrete 15, a pair of steel plates te, 17 forming exterior plates are provided to cover the circumferential surface of the exterior concrete l5. The steel plates IG, 17 have a cylindrical shape, and one steel plate l6 disposed on the side of the socket l2 is formed to have a smaller diameter than the steel plate l7 on the other side disposed on the side of the socket l3. The steel plate 16 on one side is disposed so as to fit inside the steel plate 17 on the other side.

A protrusion l8 is formed in the radial direction on the steel plate l7 on the other side by punching, and the protrusion l8 is formed on the steel plate l7 on the one side! 6 in the tube axis direction. Further, the other end of the steel plate 16 on one side is locked to the stepped portion I4 of the socket portion l2 in the direction of the tube axis.

Hereinafter, the effects of the above configuration will be explained.

Prior to placing the exterior concrete 15, a steel plate 16. is placed around the cast iron pipe 11. 17, as shown in FIGS. 2 and 3, one steel plate IG placed on the side of the socket l2 of the cast iron pipe 11 is pushed in from the side of the opening 13 of the cast iron pipe 11. Then, the steel plate 16 on one side is locked in the tube axis direction by a stepped portion l4 provided on the outer periphery of the socket portion l2 of the cast iron pipe 11. Then, as shown in Figures 4 and 5, the cast iron pipe l!
The steel plate ■7 on the other side, which is placed on the side of the inlet l3, is the inlet of the cast iron pipe 11! 3 side, and the other side steel plate 17 is locked to the Zla part of the one side steel plate 16 by the protrusion l8 provided on the other side steel plate 17. In this state, the cast iron pipe If and the steel plate 16. Exterior concrete between 17}1
5 to form a pipe for the propulsion method. Therefore, by locking the protrusion l8, the steel plates IG and 17 can be easily aligned in the tube axis direction.

Furthermore, while being propelled into the soil, the frictional force F generated between the soil and the steel plates 1G, 17 is received by the stepped portion l4 of the socket portion 12, and the steel plates lfi,
17 is prevented from shifting.

Effects of the Invention As described above, according to the present invention, the outer plate on one side is locked in the tube axis direction by the step provided on the outer periphery of the socket portion of the core tube, and the outer plate on the other side is fixed. By locking the other side of the exterior plate to the end of one side of the exterior plate using the protrusion, the steel plates can be easily aligned with each other, and the position of the exterior plate with respect to the exterior concrete can be prevented. .

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIGS. 2 to 3 are perspective views showing the arrangement of one side of the exterior plate, and FIG.
Figures 5 to 5 are perspective views showing the arrangement of the exterior plate on the other side;
FIG. 6 is an overall configuration diagram of a conventional propulsion method pipe. II...Cast iron pipe, 12...Socket part, 13...Inlet part, 14...Step part, 15...Exterior concrete 1-,
IG, 17... Steel plate, 18... Step portion.

Claims (1)

[Claims] 1. In a pipe for the propulsion method in which an exterior concrete is provided around the outer periphery of the core pipe and a plurality of exterior plates are provided surrounding the outer periphery of the exterior concrete, the exterior plate is engaged with the outer periphery of the socket part of the core pipe in the direction of the tube axis. An annular step is provided, and one side of the exterior plate placed on the socket side of the core tube is fitted inside the other side of the exterior plate placed on the insertion port side, and the other side of the exterior plate A pipe for use in a propulsion method, characterized in that a protrusion that engages with an end of an exterior plate on one side is provided.