JP2003039032A - Inner surface cleaning device and inner surface cleaning method for large diameter pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal surface cleaning apparatus and an internal cleaning method for a large-diameter pipe, which solve environmental problems and improve work efficiency by mechanically cleaning the inner surface of the large-diameter pipe. . SOLUTION: The centrifugal projection type includes an impurity separating means connected to a pipe to be processed, an abrasive material tank connected to the impurity separating means, and an abrasive material introducing cylinder connected to the abrasive material tank. A blasting machine, a rotating frame fixedly supporting and supporting the centrifugal projection blasting machine, and a rotatable frame. A press-holding traveling cart that moves up and down while being pressed;
A lower carriage connected to a lower part of the system and moving up and down while pressing a roller against the inner surface of the pipe to be processed; and a lifting means connected to the pressing holding traveling carriage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing an old coating film, deposits such as rust on the inner surface of a large-diameter pipe (for example, a water pressure pipe of a hydroelectric power plant), and polishing and adjusting the base material. Regarding the method.

[0002]

2. Description of the Related Art For example, an inner surface of a large-diameter penstock installed in a hydroelectric power plant or the like is coated with anti-corrosion tar epoxy resin paint, etc., but it deteriorates with the passage of time,
Rust may occur. For this reason, it is necessary to periodically remove the deteriorated coating film, rust and the like and re-paint in order to prolong the replacement time of the penstock. Conventionally, the sandblasting method, the water jet method, or the like has been used as the scouring method, but these operations are carried out manually by bringing the equipment into the penstock.

[0003]

As described above, when the inner surface of the penstock is ground and cleaned manually, it has a problem of a bad environment due to dust, industrial waste, etc. and is in a special working environment. Therefore, there were problems such as poor work efficiency.
The present invention has been made in view of the above problems, by mechanically scavenging the inner surface of a large diameter pipe such as a hydraulic pipe of a hydraulic power plant, a large diameter that solves environmental problems and enhances work efficiency An object of the present invention is to provide an inner surface cleaning / cleaning device and a method for inner surface cleaning / cleaning of a pipe.

[0004]

In order to achieve the above object, the inner surface scavenging and cleaning apparatus for a large-diameter pipe according to the present invention is an apparatus for scavenging and cleaning the inner surface of a large-diameter pipe to be processed which is vertically or inclined. A centrifugal projection provided with an impurity separating means communicated with the pipe to be treated, a polishing / cleaning material tank communicated with the impurity separating means, and a polishing / cleaning material introducing cylinder communicated with the polishing / cleaning material tank. Type polishing machine, a rotary frame which fixedly supports the centrifugal projection type cleaning machine and is rotatable, and a rotary frame which is connected to an upper portion of the rotary frame and is rolled on the inner surface of the pipe to be treated. A press-holding traveling carriage that moves up and down while pressing the
A lower carriage that is connected to a lower portion of the frame and moves up and down while pressing a roller against the inner surface of the pipe to be processed; and an elevating means connected to the pressing and holding traveling carriage.

Further, in the inner surface polishing / cleaning device for a large-diameter pipe according to the present invention, a polishing / cleaning material recovery hopper is connected to a lower portion of the lower carriage, and the lower end of the polishing / cleaning material recovery hopper is centrifugally projected through a screw conveyor. It is characterized in that it is communicated with the polishing agent introduction tube of the type polishing machine.

Further, the inner surface polishing and cleaning apparatus for a large diameter pipe according to the present invention is characterized in that the large diameter pipe to be treated is a water pressure pipe of a hydroelectric power plant.

In order to achieve the above-mentioned object, the method for polishing and cleaning the inner surface of a large-diameter pipe according to the present invention is a method for polishing and cleaning the inner surface of a large-diameter pipe to be processed which is vertically or inclined. The centrifugal projection-type polishing machine is projected by the centrifugal projection-type polishing machine while projecting the polishing-cleaning material supplied from the polishing-cleaning material tank in a state in which the rolling of the centrifugal projection-type polishing machine arranged inside the pipe to be treated is prevented. The inner surface of the tube to be treated is ground and swept by rotating the sweeper, and the centrifugal projection type sweeper while rotating is lowered by the elevating means while maintaining this state of sweeping and the desired position of the tube to be treated is lowered. The inner peripheral surface is subjected to blasting, and the projected blasting / cleaning material is further collected in an impurity separating means, and the impurities collected together with the blasting / cleaning material in the impurity separating means are separated and removed. It is characterized in that the material is returned to the abrasive cleaning material tank and is recycled and reused.

In the present invention, the large-diameter pipe to be processed refers to a pipe having an inner diameter of 600 mm or more.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings by taking a penstock of a hydraulic power plant as an example. Figure 1
FIG. 2 is an overall schematic view showing an embodiment of the present invention, and FIG. 2 is an enlarged detailed view of an apparatus used in a pipe to be processed. In FIG. 1, a power station 2 is located on the lower right side of a head tank 1 that stores water, and a power generator 3 that generates power by rotating a water turbine 4 is installed in the power station 2.

An inlet valve 6 is arranged at a position facing the water turbine 4, and the inlet valve 6 communicates with the head tank 1 via an inclined hydraulic pipe 5 (in this embodiment, an inclination of 45 degrees). Has been done. The inclined penstock 5 appropriately has a not-shown split portion at a desired position and also has not-shown expansion joint portions at necessary positions.

A polishing / cleaning material receiving hopper 7 is attached to the lower end of the pipe 5a to be treated of the inclined hydraulic pipe 5, and the polishing / cleaning material receiving hopper 7 is provided with an impurity separating means 8b via a suction hose 8a. Is in communication with. Incidentally, at a normal time when the scouring work is not performed, the expansion joint portion (not shown) is attached to the lower end of the pipe 5a to be treated. Further, a manhole 5b for carrying in equipment and the like is provided in the pipe 5a to be processed, and a compressor 8d is communicated with the impurity separating means 8b. Furthermore, the manhole 5
Although b is shown only at one location in FIG. 1, a large number of manholes (not shown) are appropriately provided at the required locations on the inclined penstock 5.

The impurity separating means 8b is communicated with a polishing / cleaning material tank 9 via a circulation hose 8c, and the polishing / cleaning material tank 9 is supplied with a supply hose winder 10 and a supply hose 11.
It is communicated with the polishing / cleaning material introducing cylinder 13 of the centrifugal projection type polishing / cleaning machine 12 described later via the. The tip of the supply hose 11 is
It is connected to a rotary joint 13a arranged in the abrasive cleaning material introducing cylinder 13. A compressor 9a is communicated with the abrasive cleaning material tank 9.

A winch 14 as an elevating means for elevating and lowering the entire apparatus inside the tube 5a to be processed is arranged outside the tube 5a to be processed, and the wire-1 of the winch 14 is arranged.
At the tip of 5, a pressure-holding traveling carriage 19 is connected and hung so as to connect cylinders 18 for opening and closing arms 17, 17 to which a plurality of rollers 16 and 16 are attached.

A frame-shaped rotary frame 20 is rotatably connected to the lower part of the center of the press-holding traveling carriage 19 by a bearing portion 21b. The rotary frame 20 is connected via a belt 21a. -It is designed to be rotated by the motor 21. The rotary projection 20 has a centrifugal projection type cleaning and cleaning machine 12 fixedly supported by the cleaning and cleaning material introducing cylinder 13, the impeller 23, and the motor 24. A guide mechanism 20a is connected to the lower end portion of 20.

A lower portion of the guide mechanism 20a is provided with a roller.
A lower trolley 28 having an expansion / contraction mechanism 26 in which the racks 27, 27 are mounted is connected, and a polishing / cleaning material recovery hopper 29 is connected to a lower portion of the lower trolley 28. A screw conveyor 30 operated by a motor 30a is connected to a lower end of the polishing / cleaning material recovery hopper 29, and a tip (not shown) of the screw conveyor 30 has the polishing / cleaning material introducing cylinder. It is connected to 13.

The rotating frame 20 is also rotatable with respect to the lower carriage 28 by the guide mechanism 20a. In the figure, reference numeral 31 is an electric wire cable winder for winding the electric wire cable 32, and reference numeral 33 is the supply wheel.
It is a pulley used for the space 11, the wire 15, the electric wire cable 32, and the like.

The pipe constructed as above has a pipe 5 to be treated.
When the inner surface of a is abraded, first, the apparatus used in the tube to be treated 5a is disassembled into a size that can be carried in from the manhole 5b, and each part of the disassembled apparatus is treated from the manhole 5b to the tube to be treated. It is loaded into 5a. Then, after carrying in, the respective parts of the disassembled device are assembled.

Next, the winch 14 is operated and the wire-
The device assembled by 15 is pulled up to the uppermost position. Then, the cylinders 18 and 18 are extended so that the rollers 16 and 1 are opened and closed via the opening and closing arms 17 and 17, respectively.
6 is pressed against the inner surface of the pipe 5a to be treated and the expansion mechanism 26 is extended to move the rollers 27 and 27 to the pipe 5a to be treated.
Press on the inner surface.

Next, the abrasive cleaning material in the abrasive cleaning material tank 9 is pressure-fed to the abrasive cleaning material introducing cylinder 13 of the centrifugal projection type abrasive cleaning machine 12 via the supply hose 11 by the air, and -While operating the motor 24 and projecting the cleaning material by the impeller 23, the motor 21 is operated to rotate the rotary frame 20 and the centrifugal projection-type cleaning machine 12 through the belt 21a, and the object to be treated is processed. The inner peripheral surface of the tube 5a is cleaned. It is preferable to use shots as the polishing / cleaning material because the shots can be recycled and reused and have a long life.

Then, while maintaining this state of cleaning, the winch 14, the wire cable winder 31 and the supply hoe.
The winder 10 gradually lowers the entire apparatus in the tube 5a to be processed through the wire 15, the wire cable 32 and the supply hose 11, and the inner surface of the tube 5a to be processed at a desired position. Finish the cleaning.

At this time, since the rollers 16 and 16 and the rollers 27 and 27 are pressed against the inner surface of the pipe 5a to be processed, the entire apparatus inside the pipe 5a to be processed is horizontally shaken. Is descended without.

Further, a part of the polishing / cleaning material projected toward the inner peripheral surface of the pipe 5a to be processed and falling falls on the polishing / cleaning material recovery hopper 29.
It is recovered by the screw conveyor 30 and transferred to the polishing / cleaning material introducing cylinder 13 of the centrifugal projection type polishing / cleaning machine 12 for reuse. This can improve the circulation efficiency of the polishing agent.

Further, the remaining polishing / cleaning material not recovered by the polishing / cleaning material recovery hopper 29 further falls in the pipe 5a to be processed and is recovered in the polishing / cleaning material receiving hopper 7 attached to the lower end of the pipe 5a to be processed. Then, it is sucked and collected by the impurity separating means 8b through the suction hose 8a. Then, the impurity separating means 8
In step b, the deteriorated coating film and the impurities such as rust that have been suction-collected together with the polishing / cleaning material are separated and removed, and then only the polishing / cleaning material is circulated by the air through the circulation hose 8c. It is pumped inside and reused. As a result, it is possible to prevent impurities from entering the polishing agent tank 9. Further, since the polishing agent can be repeatedly circulated and used, the amount of industrial waste can be reduced.

When the inner surface of the pipe to be treated 5a is thus ground and cleaned, the device used in the pipe to be treated 5a is disassembled into a size that can be carried out from the manhole 5b, and each of the disassembled devices is disassembled. The portion is carried out from the manhole 5b to the outside of the pipe 5a to be treated, and the coating work is performed.

A coating device may be attached to the device used in the pipe 5a to be processed, and the coating work may be performed immediately after the cleaning work is completed. Further, an image recognition camera such as a CCD camera may be attached to the apparatus used in the tube to be processed 5a to remotely monitor the polishing state and the coating state in the tube to be processed 5a.

Further, in the above-mentioned embodiment, as described above, the expansion joint part (not shown) normally attached to the lower end of the pipe 5a to be treated is removed, and the polishing / cleaning material receiving hopper 7 is attached to the joint. Although the abrasive cleaning material falling to the lower end of the pipe 5a is collected, the expansion joint portion may be too large or too heavy to be removed depending on the diameter of the inclined hydraulic pipe 5. In this case, as shown in FIG. 3, with the expansion joint part attached, the blocking plate 34 is inserted into the divided portion provided in the lower part of the inclined hydraulic pipe 5, and the falling cleaning and cleaning material is removed from the inclined hydraulic pipe. Store in the lower part of 5.
And the abrasive cleaning material stored in the lower part of the inclined penstock 5 is
It is sucked and recovered by the impurity separating means 8b through the suction hose 8a inserted from the manhole 5b.

In the embodiment of the present invention, the inner surface of the inclined pipe 5a to be treated is ground and swept. However, the present invention is not limited to this, and the pipe 5a to be treated is vertical. It may be.

In the embodiment of the present invention, after the impurities are separated and removed by the impurity separating means 8b, the remaining polishing agent is pressure-fed by the air into the polishing agent tank 9 through the circulation hose 8c. However, the method of transporting the cleaning material here is not limited to this, and it may be transported by a belt conveyor, a bucket elevator, or the like.

[0029]

As is apparent from the above description, the present invention is a device for polishing and cleaning the inner surface of a large-diameter pipe to be treated which is vertically or inclined, and has impurities which are communicated with the pipe to be treated. Centrifugal projection type polishing machine equipped with a separating means, a polishing / cleaning material tank communicated with the impurity separating means, and a polishing / cleaning material introducing cylinder communicated with the polishing / cleaning material tank, and the centrifugal projection type polishing / cleaning machine A rotary frame which is fixedly supported and is rotatable, and a rotary frame which is connected to an upper portion of the rotary frame and is connected to an inner surface of the pipe to be treated.
A press-holding traveling carriage that moves up and down while pressing the roller, a lower carriage that is connected to a lower portion of the rotating frame and that moves up and down while pressing the roller against the inner surface of the pipe to be processed, and the pressing-holding traveling carriage. Since it is equipped with the connecting elevating means, it becomes possible to mechanically clean the inner surface of a large-diameter pipe such as a hydraulic pipe of a hydroelectric power plant, thereby solving environmental problems. It is possible to improve work efficiency. Further, since the blasting can be carried out at a constant speed by a machine, there are various effects such as a uniform blasting treatment without unevenness of the blasting.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is an enlarged detailed view of an apparatus used in a pipe to be processed.

FIG. 3 is an overall schematic configuration diagram showing an embodiment in which the expansion joint is not removable.

[Explanation of symbols]

5a Pipe to be processed 8b Impurity separation means 9 Abrasive cleaning material tank 12 Centrifugal projection type cleaner 13 Abrasive material introduction cylinder 14 Lifting means 16 27 Roller 19 Push-hold traveling cart 20 rotating frames 28 Lower trolley 29 Abrasive material recovery hopper 30 screw conveyor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideo Takeuchi             3-1, Honohara, Toyokawa City, Aichi Prefecture             -In Blast Co., Ltd. (72) Inventor Hideki Morimoto             3-1, Honohara, Toyokawa City, Aichi Prefecture             -In Blast Co., Ltd. (72) Inventor Terabe Attack             3-1, Honohara, Toyokawa City, Aichi Prefecture             -In Blast Co., Ltd. (72) Inventor Hitoshi Takeda             No. 180, Komaki, Oki, Ichinomiya-cho, Hoi-gun, Aichi Prefecture             Ground 1 Shinto Kogyo Co., Ltd. Shinto Blaster             Inside the Campanie F term (reference) 3B116 AA13 BA06 BB72 BB88 CD21

Claims (4)

[Claims] 1. A device for polishing and cleaning the inner surface of a large-diameter pipe to be treated 5a which is vertically or inclined,
Centrifugal projection type polishing equipped with an impurity separating means 8b communicated with a, a polishing / cleaning material tank 9 communicated with the impurity separating means 8b, and a polishing / cleaning material introducing cylinder 13 communicated with the polishing / cleaning material tank 9. A sweeper 12, a rotary frame 20 that supports and supports the centrifugal projection-type polishing sweeper 12 and that is rotatable, and is connected to an upper portion of the rotary frame 20 so that the inner surface of the tube 5a to be processed is connected to the rotary frame 20. A press-holding traveling carriage 19 that moves up and down while pressing the rollers 16 and 16 is connected to a lower portion of the rotating frame 20 and moves up and down while pressing the rollers 27 and 27 against the inner surface of the pipe 5a to be processed. An inner surface cleaning / cleaning device for a large-diameter pipe, which comprises a lower carriage 28 that operates and a lifting means 14 that is connected to the pressure-holding traveling carriage 19. 2. A polishing / cleaning material recovery hopper 29 is connected to a lower portion of the lower carriage 28, and a lower end of the polishing / cleaning material recovery hopper 29 is cleaned by a centrifugal conveyor of the centrifugal projection type cleaning / cleaning machine 12 via a screw conveyor 30. The inner surface cleaning / cleaning device for a large-diameter pipe according to claim 1, wherein the inner surface cleaning / cleaning device is communicated with the material introducing cylinder 13. 3. The inner surface cleaning and cleaning apparatus for a large-diameter pipe according to claim 1, wherein the large-diameter pipe to be treated 5a is a hydraulic pipe of a hydroelectric power plant. 4. A method for sharpening and sweeping the inner surface of a large-diameter pipe to be treated in a vertical or inclined state, in which roll of a centrifugal projection-type sweeping machine arranged in the pipe to be treated is prevented. so,
While rotating the centrifugal projection type cleaning and sweeping machine while projecting the polishing and cleaning material supplied from the polishing and cleaning material tank by the centrifugal projection type polishing and cleaning machine, the inner peripheral surface of the pipe to be processed is ground and cleaned, While maintaining the above, the rotating centrifugal projection type polishing machine is lowered by the elevating means to perform polishing of the inner peripheral surface to a desired position of the pipe to be treated, and further the projected polishing material is separated into impurities. A large-diameter pipe characterized in that after the impurities are collected together with the polishing / cleaning material by the means for separating impurities, the impurities / cleaning material are separated and removed, and then the polishing / cleaning material is returned to the polishing / cleaning material tank and circulated and reused. Internal cleaning method.