JPH04254087A - Buried pipe breaking and replacing device - Google Patents

Abstract

PURPOSE:To improve working efficiency by securing a new pipe to the rear end of a support frame having a breaking impeller, which is rotatable outward taking the head as a fulcrum, at its head and a breaking and expansion body, which can advance and retract, inserting the front end of the support frame and burying a new pipe while breaking an old pipe with the breaking impeller expanded. CONSTITUTION:A new pipe 12 is secured to the rear end 11 of a support frame 1, and the front end of the support frame 1 is made to advance into an old pipe 3. When the head section of the support frame 1 enters the old pipe 3, an expansion body 10 is made to advance by a driving means 9. By this constitution, a breaking impeller 4 is expanded outward around a rotary shaft 6 by the conic expansion body 10. By this constitution, the old pipe 3 is expanded outward and broken. While taking this breaking action, the new pipe 12 is advanced to be buried.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to iron pipes buried underground;
This invention relates to a buried pipe destruction and replacement device that destroys a pipe such as a concrete pipe and replaces it with a new pipe.

0002

[Prior Art] A buried pipe destruction/replacement device such as the one described above did not exist in the past. Therefore, when destroying a pipe buried underground and replacing it with a new pipe, first the pipe buried underground must be destroyed. The method used was to destroy the pipe using appropriate tools and then bury a new pipe in the same place.

0003

[Problem to be solved by the invention] However, as described above, it takes a lot of effort and time to destroy a pipe buried underground using an appropriate tool and then bury a new pipe in the same place. It was a tedious task. The present invention was made in order to solve these problems by providing a new device that can destroy a pipe buried underground and replace it with a new pipe all at once. be.

0004

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a system in which the work of destroying a pipe buried underground and the work of burying a new pipe in the same place are performed continuously. The present invention provides a buried pipe destruction and replacement device. That is, in the buried pipe breaking and replacement device of the present invention, a plurality of breaking blades are disposed at the head of a support frame inserted into a pipe buried underground so as to be rotatable in and out directions around the front end of the support frame. A substantially conical expanding body is provided at the center of the support frame and is moved forward and backward by a driving means, and when the expanding body moves forward, each of the destruction blades rotates outward. It is characterized in that the rear end of the support frame is fitted into the front end of the new pipe to be buried.

[0005]

[Operation] The buried pipe destruction and replacement device of the present invention destroys a pipe buried underground (hereinafter referred to as "old pipe") and replaces it with a new pipe (hereinafter referred to as "new pipe"). When performing this work, the rear end of the support frame of the buried pipe destruction and replacement device is fitted into the front end of the new pipe to be buried, and the new pipe is moved to the position where the old pipe is, that is, the new pipe by the propulsion device. When the head of the support frame enters the old pipe, the substantially conical expanding body is advanced by the driving means. Then, the substantially conical expanding body powerfully rotates each breaking blade outward (FIG. 2). Each destruction blade rotates outward within the old pipe to forcefully spread the old pipe from the inside to the outside and destroy the old pipe. Thereafter, while the new pipe is propelled by the propulsion device, the approximately conical expanding body is advanced and retreated by an appropriate drive means to repeatedly expand each destruction blade outward within the old pipe, thereby completely destroying the old pipe. At the same time, the new pipe reaches the predetermined position. This completes the destruction of the old pipe and the burial of the new pipe. Fragments of the destroyed old pipe remain in the soil around the new pipe.

[0006]

Embodiments Next, embodiments of the present invention will be described with reference to the accompanying drawings. Reference numeral 1 indicates a support frame for the buried pipe breaking and replacement device. The head 2 of the support frame 1 is inserted into the old pipe 3 and has an outer diameter slightly smaller than the inner diameter of the old pipe 3. Support frame 1
A plurality of destruction blades 4 are disposed on the head 2 of the head 2 so as to be rotatable in the inward and outward directions about the front end 5 of the blade. 6 is the destruction blade 4
, and 7 is a bearing for the rotation shaft 6. In the example shown in FIG. 3, four breaking blades 4 are arranged, but the number of breaking blades 4 is not limited to this. It is preferable that each breaking blade 4 has a tip 4a of cemented carbide or the like fixed to the portion that comes into pressure contact with the inner surface of the old tube 3. Reference numeral 8 denotes a through hole that allows the destruction blade 4 to rotate outward. A substantially conical expanding body 10 that is moved forward and backward by a driving means 9 is disposed at the center of the support frame 1, so that when the expanding body 10 moves forward, each breaking blade 4 rotates outward. Eggplant. As the driving means 9, for example, a hydraulic jack is used. The support frame 1 has its rear end 11 fitted into the front end 13 of the new pipe 12 to be buried. The new pipe 12 is propelled by an appropriate propulsion device (not shown).

[0007]

[Effects of the Invention] As explained above, if the buried pipe destruction and replacement device of the present invention is used, the work of destroying old pipes buried underground and replacing them with new pipes can be done efficiently all at once. The labor and time required for such work are significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a buried pipe destruction and replacement device according to the present invention, a new pipe, and an old pipe.

FIG. 2 is a cross-sectional view showing the device in use.

FIG. 3 is a front view showing an example of how the breaking blades are arranged in the buried pipe breaking and replacing device according to the present invention.

[Explanation of symbols]

1 Support frame 2 Head 3 Old pipe 4 Destruction feather 4a Chip 5 Front end 6 Rotation axis 7 Bearing 8 Through hole 9 Driving means 10 Expanding body 11 Rear end 12 New pipe 13 Front end

Claims (1)

[Claims] Claim 1: A support frame to be inserted into a pipe buried underground is provided with a plurality of destruction blades on the head thereof so as to be rotatable in the inward and outward directions about the front end of the support frame. At the center is a generally conical expanding body that moves forward and backward by a driving means.
Each breaking blade is configured to rotate outward when the expanding body moves forward, and the rear end of the support frame is fitted into the front end of the new pipe to be buried. Buried pipe destruction and replacement equipment.