JPH04102783A - Pipeline crushing device - Google Patents

Abstract

PURPOSE:To eliminate residual broken pieces of an old pipe in a new pipe to be laid with progress of a header by locating a cylindrical casing for carrying broken pieces of the crushed old pipe in rear of the header. CONSTITUTION:A header 2 is located in the tip end of a new pipe 3. The tip end of the header 2, in which a crushing blade 4 is fitted, is opened, and a fixed spiral part 5 is projected spirally in the inner surface of the header 2. A casing 6 provided from the inside of the header 2 to the rear is located inside of the new pipe 3, and a turning spiral vane 7 formed into a screw conveyor is located freely to turn from a part, where the fixed spiral part 5 of the header 2 is formed, to the inside of the casing 6. An old pipe can be thereby crushed finely by the fixed spiral part 5 of the header 2 to be carryed for exhaust through the inside of a casing, and the new pipe 3 can be laid without leaving broken pieces of the old pipe in the new pipe 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pipe crushing device used when replacing an existing pipe without excavating.

Conventional technology Conventionally, when laying an existing pipeline without excavation, a header with a crushing blade at the tip is propelled against the existing pipeline.
The existing pipe was crushed using this header, and the fragments of the old pipe were transported out of the pipe through the inside of the new pipe, which was propelled following the header.

Problems to be Solved by the Invention However, when asbestos pipes, etc. are replaced, if pieces of the crushed pipes are transported through the new pipes, harmful components of the asbestos pipes may remain in the new pipes. There was a problem.

The present invention solves the above-mentioned problem, and aims to provide a pipe crushing device that can replace an existing pipe without leaving pieces of the old pipe in a newly installed pipe.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a header installed at the tip of a crushing blade for crushing old pipes in an existing pipeline, and a header installed at the tip of a crushing blade for crushing old pipes in an existing pipeline, and a new pipe propelled after the header. a cylindrical casing disposed in the header and forming a path for conveying fragments of the crushed old pipe; a rotating spiral blade disposed in the header and the casing to form a screw conveyor; and a rotary spiral blade protruding from the inner surface of the header and a stationary spiral portion that works together with the rotating spiral blades to further crush the fragments of the old pipe into smaller pieces.

Operation With the above configuration, the fragments of the old pipe crushed by the crushing blade of the header enter the header and are further crushed into fine pieces by the fixed spiral portion and the rotating spiral blade inside the header or the tip of the casing. The finely crushed fragments of the old pipe are then conveyed to the rear of the casing and discharged by the rotation of the rotating spiral blades. Therefore, no fragments of old pipes remain in the new pipes that are laid as the header advances.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 to 3, an old pipe 1 made of an existing pipe or an asbestos pipe is formed underground. A header 2 for crushing the old pipe 1 is arranged at the tip of the new pipe 3.

The tip of the header 2 is open to which a crushing blade 4 is attached, and a fixed helical portion 5 is provided protruding from the inner surface. Inside the new pipe 3, a casing 6 provided rearward from inside the header 2 is disposed, and from a portion of the header 2 where the fixed spiral portion 5 is formed to inside the casing 6, there are rotating spiral blades 7 forming a screw conveyor. It is arranged so that it can rotate freely. At the rear end of the new pipe 3, a hydraulic motor 8 for driving the rotating spiral blade 7 and a hydraulic jack 9 as a propulsion device are disposed.

Note that 10 is a starting shaft, 11 is a reaching shaft, and 12 is a cast iron joint, and the inner diameter of the header 2 is larger than the outer diameter of the old pipe 1 and is approximately the same as the inner diameter of the cast iron joint 12. Further, water is supplied into the header 2 and the casing 6 to prevent the generation of dust.

In the above configuration, when replacing the old pipe 1 with the new pipe 3, the new pipe 3 is propelled by the hydraulic jack 9 while the old pipe 1 is crushed by the crushing blade 4 of the header 2. At this time, the fragments of the old pipe 1 crushed by the crushing blade 4 enter into the ladder 2 through the tip opening of the header 2, and enter the fixed spiral portion 5.
and the rotating spiral blade 7 to further crush it into fine pieces. The finely crushed fragments of the old pipe 1 are then conveyed to the rear of the casing 6 by the rotation of the rotating spiral blades 7 and collected at a predetermined location in the starting shaft 10. I want to, header 2
The old pipe 1 will be installed inside the new pipe 3 that will be laid as the construction progresses.
No asbestos material remains.

The cast iron joint 12, which does not contain harmful components, is broken and left underground when the old pipe 1 is crushed, as shown in FIG.

Effects of the Invention As described above, according to the present invention, the fixed spiral part installed inside the header or the tip of the casing cooperates with the rotating spiral blade to crush the old pipe fragments into small pieces. can be transported and discharged through the casing, and old pipes can be replaced with new pipes without leaving any fragments of the old pipes in the new pipes that are laid as the header advances.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a pipe crushing device according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view 1 of a header of the same pipe crushing device, and FIG. 3 is an arrow taken along the line A-A in FIG. This is a perspective view. ■...Old pipe, 2...Header 3...New pipe, 4.
... Crushing blade, 5... Fixed spiral portion, 6... Casing, 7... Rotating spiral blade.

Claims (1)

[Claims] 1. A header equipped with a crushing blade at the tip for crushing old pipes in the existing pipeline, and a header installed in the new pipe that is propelled behind this header to transport the fragments of the crushed old pipe. A cylindrical casing forming a path, a rotating helical blade disposed within the header and the casing to form a screw conveyor, and a rotary spiral blade protruding from the inner surface of the header, which collects fragments of crushed old pipes in cooperation with the rotating spiral blade. A pipe crushing device characterized in that it is equipped with a fixed spiral part that works to crush the pipe into even smaller pieces.