JPH05305U - Internally driven rotary cutting device for power tube asbestos coating - Google Patents

Abstract

(57) [Abstract] [Purpose] An internal drive type that can gradually remove the asbestos-coated portion of a power pipe from one end face to the other end face as it moves in the pipe axial direction within the pipe. A rotary cutting device is provided. [Configuration and effect] A construction machine capable of pulling and moving a through hole of a power pipe in the axial direction of a pipe, a rotary shaft that rotates on a central axis line in the hole by operating a driving device mounted on the machine, and the machine. By providing a member for preventing rotation in the hole, and a cutter unit for cutting and removing the end face of the asbestos coating part that integrally rotates with the rotary shaft and constitutes the inner peripheral wall of the through hole, the through hole of the construction machine As it moves inward, the asbestos-coated portion can be continuously cut and removed from the front end face toward the rear by the operation of the cutter portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an internally driven rotary cutting device for a power tube asbestos coating.

[0002]

[Prior art and its problems]

 Most of the existing power pipes buried underground are made of concrete, and as shown in Fig. 1, the inner wall surface of the through hole a for cable insertion is covered with the asbestos coating part b made of asbestos cement pipe. .. Recently, the internal space of the through-hole a becomes narrow due to the increase of the power capacity, and as one of the countermeasures, it is proposed to remove the asbestos coating b from the inside of the through-hole a to increase the effective diameter of the hole a. ing. Since the asbestos cement pipe forming the inner peripheral wall surface of the asbestos-coated portion b has a substantially smooth surface and is considerably hard, it is not possible to apply the conventional device used for cleaning the inside of the existing buried pipe. Therefore, development of a device for the asbestos-coated part b has been desired.

The present invention has been made in view of such a demand.

[0004]

[Means for solving problems]

 The present invention is an apparatus for cutting and removing the asbestos coating formed on the inner peripheral wall surface of a through hole of an electric power pipe, which comprises a construction machine capable of pulling and moving in the through hole in the pipe axial direction. However, the construction machine is provided with a rotating shaft that rotates on the center axis of the hole by operating a drive device mounted on the machine, and a detent portion that locks the machine in the hole. The present invention relates to an internal drive type rotary cutting device for an electric power tube asbestos coating part, characterized in that the rotating shaft is provided with a cutter part for cutting the end face of the asbestos coating part.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of the entire device of the present invention, together with the installation situation of the power tube in the through hole a.

The construction machine 10 is installed in the through hole a so as to be able to move in the pipe axis direction by pulling the rope 11, and the machine 10 has a drive unit 12 such as a hydraulic motor mounted on the machine. The rotating shaft 14 which is operated to rotate on the central axis of the hole through the speed reducer 13 is provided so as to extend rearward with respect to the pulling direction.

In order to support the rotational reaction force of the rotary shaft 14, the construction machine 10 is provided with a rotation stopping portion 15.

The rotation stopping portion 15 is composed of a plurality of blade plate portions 151 that are radially spaced from the outer peripheral portion of the construction machine 10 and are arranged at equal intervals. Each blade plate portion 151 has a tip in the pipe axis direction. It has an extending blade plate 152, and the construction machine 10 can be stopped in the hole by biting the tip blade portion 152 into the asbestos coating portion b. The illustrated embodiment shows the case where the rotation stopping portion 15 is provided at two positions of the front end portion and the rear end portion of the processing machine 10, but the installation position is not necessarily limited to this and can be appropriately increased or decreased.

An auxiliary detent member 16 may be provided midway on the rotary shaft 14 in order to reinforce the in-hole detent of the construction machine 10. The member 16 is integrally connected to the construction machine 10 via a rod 17, and locks the machine 10 in the hole.

The auxiliary detent member 16 has a main body portion 162 that is freely fitted and fixed on the rotary shaft 14 through a proper bearing member (not shown in the figure) in a through hole 161 at the center thereof. It is composed of a blade plate portion 163 radially extended from the outer peripheral portion of the main body portion 162, and like the detent member 15, the tip blade plate 164 of the blade plate portion 163 is bited into the asbestos coating portion b. Then, the main body 162, and by extension, the construction machine 1 integrally connected to the main body 162, can be stopped in the through hole a.

The blade plate portions 151 and 163 of the rotation stopping portions 15 and 16 can be configured so that the overhanging width can be appropriately adjusted according to the hole diameter of the through hole a.

A cutter portion 18 for cutting the end face of the asbestos-coated portion b is provided at the rear end portion of the rotary shaft 14.

The cutter unit 18 has two holder units 181 and 181 that are arranged at equal intervals and project radially from the rotary shaft 14, and a cutter of a rotary cutting type is provided in front of the tip of the holder unit. 182 and 182 are provided. The holder portions 181 and 181 can be configured so that the protruding length thereof can be appropriately adjusted according to the hole diameter of the through hole a and thus the outer diameter of the end surface of the asbestos coating portion b.

With respect to the rear end portion 141 (see FIG. 2) of the rotary shaft 14, center guide portions 19, 20 for holding the shaft 14 on the central axis of the through hole a are provided on both front and rear sides thereof. It is equipped.

The front center guide portion 19 includes a main body portion 192 fitted and fixed to the rotary shaft 14 so as to be free from rotation via an appropriate bearing member (not shown in the drawing) in the through hole 191 in the center, and The arm portion 193 is configured to project radially from the main body portion 192, and the tip of the arm portion 193 is provided with a sled-shaped tip shoe 194 that is in sliding contact with the inner peripheral surface of the asbestos-coated portion b. The guide portion 19 is integrally connected to the main body portion 162 of the auxiliary rotation stopping member 16 via the rod 21 in the main body portion 192 and is fixed to the rotation.

As shown in detail in FIG. 2, the rear center portion 20 has a main body portion 201 connected to the rear end portion 141 of the rotary shaft 14 via a self-joint portion 22, and a radial direction protruding from the main body portion 201. A plurality of arm portions 202 arranged at equal intervals, and the tip of the arm portion 202 is provided with a sled-shaped tip shoe 203 slidably contacting the inner peripheral surface of the through hole a after the asbestos coating portion b is removed. Has been.

As the universal joint portion 22, a ball joint structure is shown in the drawing. The main body portion 221 of the joint portion 22 is connected to the rear end portion 141 of the rotary shaft 14 via the bearing 23, and the bulb portion 222 protruding rearward from the main body portion 221 corresponds to the main body portion 201 of the guide portion 20. It cooperates with the concave bay portion 204 to form a ball joint.

In order to hold the ball joint part in line, a spring wire 24 is inserted between the main body part 201 and the bulb part 222. When necessary, the ball joint rotates against the spring wire 24 by a predetermined angle.

Although most of the through holes a are straight lines, some of them may have a very gentle bend with a radius of about 6 m.

As measures against the passage of such a bent portion, universal joint portions 25 and 26 are provided at two locations on the rotary shaft 14, that is, at two locations in front of and behind the auxiliary detent portion 16. The rods 17 and 21 are made of a material such as a spring rod that can be bent against the resilience of the springs so as not to impair the rotatability of the universal joints 25 and 26. Used.

Similarly, the arm portions 193 and 202 of the center guide portions 19 and 20 have a structure that can be expanded and contracted and / or tilted in order to correct and absorb the eccentricity tendency that occurs when the curved portion passes. Is advantageous. Such a configuration can be obtained by forming the arms 193, 202 from an elastic material such as rubber, or by supporting the arms 193, 202 on the main body 201, 192 via an elastic member such as a spring. In the other figures, 27 is a pressure fluid supply conduit, and 28 is a rope for collecting the construction machine 10 toward the rear side when necessary.

At the time of construction, in the state shown in FIG. 1, while operating the drive unit 12 to rotate the cutter unit 18 via the rotary shaft 14, the construction machine 10 is operated by the rope 11 to pass through the through hole a. By pulling and moving the inside toward the pipe axis direction, the asbestos-coated portion b can be cut and removed from the rear end face toward the front.

While the construction machine 10 is moving within the through hole a, the tip blade portions 152 and 164 of the blade plate portions 151 and 163 of the rotation stopping portions 15 and 16 advance while cutting a groove in the asbestos coating portion b. By locking the tip blades 152 and 164 in the kerfs (not shown), the construction machine 10 is firmly fixed in the through hole a, and the rotational reaction force of the rotary shaft 14 and the cutter 18 is prevented. Can be supported without the risk of co-rotation.

Further, since the center guide portions 19 and 20 are provided on both front and rear sides of the cutter portion 18, the center of rotation of the cutter portion 18 is always held on the central axis of the through hole a. Therefore, as the cutter portion 18 rotates and pulls forward, the rear end surface of the asbestos coating portion b can be stably and reliably cut and removed toward the front.

By continuing the movement of the construction machine 10 in the hole, the asbestos-coated portion b can be cut and removed over the entire length.

The cut-and-removed material of the asbestos-coated portion b is removed from the through hole a 1 by applying an appropriate hole cleaning means.

[0028]

[Effect of the device]

 According to the device of the present invention, the asbestos coating portion can be sequentially scraped away from the rear end face forward by the rotation given to the cutter portion, so that the coating portion has a smooth inner peripheral surface and has a considerable surface hardness. Despite this, it has the feature that it can be cut out and removed with good work efficiency.

Furthermore, since it is an internal drive type, it has a compact structure and is convenient for transportation and storage.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing the whole of the device of the present invention and the installation situation in a power tube through hole.

FIG. 2 is an enlarged sectional view of a rear center guide portion.

[Explanation of symbols]

 10 Construction Machine 11 Rope 12 Drive Device 13 Reducer 14 Rotating Shaft 15 Rotation Stopper 16 Auxiliary Rotation Stopper 17 Rod 18 Cutter 19 Front Center Guide 20 Rear Center Guide 21 Rod 22 Universal Joint 23 Bearing 24 Spring Wire 25 Universal joint 26 Universal joint 27 Pressurized fluid supply conduit 28 Rope

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigenfumi Matsumoto 2-33-1 Honjo Higashi, Kita-ku, Osaka City, Osaka Prefecture Kendennai Co., Ltd. (72) Masao Nakayama 2-3 Honjo-Higashi, Kita-ku, Osaka City, Osaka Prefecture No. 41 Kindennai Co., Ltd. (72) Inventor Reiji Itagaki 2-3-3 Honjo Higashi, Kita-ku, Osaka City, Osaka Prefecture No. 41 Kindennai Co., Ltd. (72) Yasuo Miyazaki 7-6, Ebisashi-cho, Tennoji-ku, Osaka City, Osaka Prefecture No. 6 Incorporated company in Osaka Waterproof Construction Co., Ltd. (72) Inventor Akira Kamido 7-6 Inoue-cho, Tennoji-ku, Osaka-shi, Osaka Incorporated company in Osaka Waterproof Construction Co., Ltd. (72) Ryota Uga Inoue-cho, Tenno-ji, Osaka No. 7-6 Incorporation company Osaka Waterproof Construction Co., Ltd.

Claims (1)

[Claims for utility model registration] 1. A device for cutting and removing an asbestos coating portion formed on an inner peripheral wall surface of a through hole of an electric power tube, wherein the through hole is formed in an axial direction of the tube. A construction machine that can be pulled and moved is provided, and a rotation shaft that rotates on the central axis of the hole by operating a drive device mounted on the construction machine and a rotation stop that locks the machine in the hole. And a cutter portion for cutting the end face of the asbestos-coated portion on the rotating shaft.