JP3586325B2 - In-pipe coating equipment - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe coating apparatus for introducing a paint into a pipe to apply a paint to an inner face of the pipe to form a thin uniform coating film on the inner face of the pipe.
[0002]
[Prior art]
Gas pipes, water pipes, communication pipes, etc. laid underground or in buildings, etc., have been corroded due to rainwater or other reasons since their long years of laying. Has become difficult.
[0003]
In recent years, various pipe repair methods have been proposed as countermeasures for such corrosion pipes. First, the inside of the pipe is cleaned using high-speed jet water or an abrasive. Then, the resin is introduced into the pipe through one end opening of the pipe, and the resin is transported using a pig or air, and a resin lining method for forming a resin film on the pipe inner surface, or the lining tube is inverted or There is a repair method such as a lining method that stretches the inside of the pipe without turning over.
[0004]
[Problems to be solved by the invention]
However, in the case of the above-mentioned repair method, since the equipment required for construction is large and the material cost of the lining material is high, the overall construction cost is high. In addition, since the pipeline is only partially repaired in the initial stage of the corrosion, there is a problem that the construction cost for the repair is relatively high.
In addition, in the case of communication pipelines, since the cable according to the pipe diameter is laid in the pipeline, there is a problem that if the inner diameter of the pipe is reduced by the lining material, the existing cable can not be laid. I do.
[0005]
The present invention has been devised in order to solve these problems, and in particular, aims to provide an in-pipe coating apparatus that can be repaired at a low cost, particularly for partial repair of existing pipelines. Is what you do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to an in-pipe coating apparatus which is introduced into a pipe from one end opening of a pipe and applies a coating material to an inner surface of a pipe to be coated while moving in the pipe. A paint cartridge part provided with an air outlet having a narrow passage cross-sectional area communicating with the outlet and the outlet, the outlet of the paint and the outlet of the paint being opened at the tip end,
The paint cartridge section is rotatably disposed at the center of the tip portion, and includes a turbine having a plurality of blade-shaped members and rotating with the flow of fluid,
The coating apparatus is introduced into the pipe from one end opening of the pipe to be coated from the front end side, the coating apparatus is guided to a predetermined position in the pipe, and the internal pressure in the pipe from the front side to the rear side of the coating apparatus is reduced. The paint flowing out of the outlet is mixed with the air passing through the air passage and is ejected from the outlet by applying a pressure difference so that the pressure rises, and the paint is uniformly applied to the inside of the pipe by the rotation of the turbine. It is characterized by the following.
[0007]
Further, the cartridge portion is a cylindrical member having an outer diameter slightly smaller than the inner diameter of the pipe to be coated, and a sled member having a thickness corresponding to the slight amount at a plurality of locations on the circumference of the cartridge portion. Is provided.
[0008]
Further, a piston mechanism is provided within the cartridge portion, the piston mechanism being moved by increasing or decreasing the amount of paint.
[0009]
Further, a paint supply port for supplying paint into the cartridge is provided on the rear end side of the cartridge section, and the paint supply port and a paint tank provided near the other end side opening of the pipe to be coated are connected by a paint hose. It is characterized by being connected.
[0010]
[Action]
When the inside of a pipe is to be coated by using the in-pipe coating apparatus having the above-described configuration, first, the pipe is introduced into the pipe from one end opening of the pipe to be coated from the tip side of the coating apparatus. Then, the coating device is moved to a coating target position in the pipeline while the device is pressure-fed by a wire holding tool or air. Next, a suction device or the like is connected to the other end of the pipe to be coated, and a differential pressure is generated in the pipe so that the internal force on the rear side is higher than that on the front side of the coating apparatus. Move it by pulling it to one end.
[0011]
At this time, the paint flows out from the outlet provided at the tip of the paint cartridge section of the coating apparatus due to the differential pressure. Further, a relatively high-speed air flow passes from the rear end of the coating apparatus toward the front end through the air passage communicating with the jet port, and is mixed with the paint that has flowed out, so that the paint is atomized. It spouts from the spout. Further, since the turbine rotates with the flow of the sprayed atomized paint, the atomized paint is uniformly applied to the inner wall of the pipeline by the rotating flow of the turbine, and a uniform coating film is formed in the pipeline.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a side view of the coating apparatus, FIG. 2 is a front view, and FIG. 3 is a rear view. In the drawing, a coating apparatus 1 includes a paint cartridge section 2, a turbine 3, a traction member connecting section 4, and a sled section 5.
[0013]
The paint cartridge section 2 is a cylindrical member having an outer diameter slightly smaller than the inner diameter of the pipe A to be coated, and is formed of a lightweight plastic or the like. The paint M having an effect is filled.
A main passage 22 is formed inside the distal end of the cartridge portion 2, and a number of paint outlets 23 are opened around the main passage 22 so as to communicate with the main passage 22. Further, a large number of air inlets 24 are provided on the outer peripheral surface of the cartridge section 2, and the air inlet 24 and the paint outlet 23 communicate with each other through an air passage 25 having a narrow passage cross-sectional area. Communicates with a paint outlet 26 provided on the tip end surface of the cartridge section 2. Further, a sealing member 27 is disposed along the circumference at the distal end edge of the cartridge portion 2 on the distal end side from the air inlet 24. Further, a piston mechanism 21 is provided in the cartridge 2 to move as the amount of the paint M increases or decreases. The paint hose 6 is connected to the piston mechanism 21, and the paint hose 6 is connected to the cartridge section 2 through a check valve 61. Can be replenished. The check valve 61 includes a valve body 61a slidably connected to the inside of the valve 61 (left and right in FIG. 1) to close an inlet of the paint hose 6, and a spring 61b for resiliently pressing the valve body 61a. Although the inlet of the paint hose 6 is normally closed, when the paint M is supplied from the paint hose 6, the paint M can be refilled into the paint cartridge 2 by pushing the valve 61 a.
[0014]
The turbine 3 has a plurality of blade members 31 arranged radially, and is fixed to a substantially center of the tip end surface of the paint cartridge section 2 by bolts 33 via a bearing 32. Therefore, the turbine 3 rotates by the flow of the fluid ejected from the paint ejection port, and diffuses the fluid toward the outer peripheral direction, that is, toward the inner wall of the pipe A to be coated.
[0015]
The traction member connecting portion 4 is provided at the rear end of the paint cartridge 2, that is, substantially at the center of the bottom plate 23 of the paint cartridge 2, as shown in FIG. An external thread portion for screwing with a tip of a material 41, for example, a wire rod, a wire or the like is provided. Further, the bottom plate 23 is provided with an insertion hole 23a for inserting the paint hose 6 communicating with the piston mechanism 21.
[0016]
The sled section 5 has a centering function for positioning the coating apparatus 1 at the center of the pipe A when the coating apparatus 1 is introduced into the pipe A to be coated. A substantially rectangular parallelepiped member having a thickness corresponding to the difference between the inner diameter of the pipe A and the outer diameter of the paint cartridge 2. As shown in FIG. Eight are provided at intervals. The material is metal or plastic, and the surface is polished so as to reduce frictional resistance with the inner surface of the pipe A.
[0017]
Next, the operation of the coating apparatus 1 configured as described above will be described with reference to FIGS.
As shown in FIG. 4, the coating apparatus 1 is introduced into the pipe A to be coated from the first manhole 7 side. At this time, the coating apparatus 1 is centered and introduced into the pipe A to be coated by the sled section 5. For example, if the pipe A to be coated is a gas medium pressure pipe of 150 (A), the inner diameter of the pipe A is 155.2 mm, and the coating apparatus 1 used for this pipe A has an outer diameter of the paint cartridge section 2. 140 mm and the thickness of the sled part 5 is about 15 mm. Then, a clearance corresponding to the difference between the inner diameter of the pipe A and the outer diameter of the coating cartridge 2, that is, a thickness of the sled portion 5 of about 15 mm is generated around the coating apparatus 1.
When the coating apparatus 1 is introduced into the pipe A, the coating apparatus 1 is connected to the traction member 41 and is pushed by the winch 8 or an operator manually to be smoothly introduced into the pipe A. Alternatively, it is introduced by being fed by air. Further, a paint hose 6 is connected to the coating device 1, and the paint hose 6 is connected to a paint tank 9 installed near the first manhole 7.
[0018]
Next, after moving the coating apparatus 1 to the coating target position in the pipe A to be coated, the suction device 12 is connected to the opening of the pipe A to be coated from the second manhole 10 side through the suction hose 11. Connecting. Then, the suction device 12 is driven to generate a negative pressure in the pipe A between the coating device 1 and the second manhole 10 side. Further, the traction member 41 is wound up by the winch 8, and the coating device 1 is moved to the second position. 1 at a constant speed to the manhole 7 side.
[0019]
As shown in FIG. 5, when the work is performed as described above, air flows from the first manhole 7 side to the second manhole 10 side in the pipeline A due to the negative pressure. At this time, the air passes through the clearance and flows into the air inlet 24 provided on the outer peripheral surface on the distal end side of the paint cartridge unit 2. At this time, since the sealing material 27 is provided along the circumference at the leading edge of the paint cartridge section 2, the air that has passed through the clearance surely flows into the air inlet 24.
Further, the paint M flows out from the paint outlet 23 due to the negative pressure, and the paint M is atomized by the air flowing from the air inlet 24 and passing through the air passage 25 at a high speed. The atomized paint is ejected at a high speed from a paint outlet 26 provided at the tip end surface of the cartridge section 2, and the ejected atomized paint hits the blade member 31 of the turbine 3 to rotate the turbine 3. The atomized fuel is diffused in the outer circumferential direction by the rotating flow of the turbine 3, and the atomized paint M is applied to the inner wall of the pipe A, and as a result, a uniform coating film is formed on the inner wall of the pipe A. .
[0020]
As another means for generating a negative pressure in the pipe A to be coated, the coating apparatus 1 is moved to a position to be coated in the pipe A to be coated, and then the opening at the other end of the pipe A is opened. To close. When the coating apparatus 1 is moved to one end of the pipe A at a predetermined speed, the volume of the space between the other end of the pipe A and the coating apparatus 1 increases, and as a result, The pressure in the space decreases and a negative pressure is generated.
[0021]
Although the present embodiment has been described in detail above, the centering mechanism in the in-pipe coating apparatus 1 of the present invention has been described using the sled portion 5, but the present invention is not limited to this. May be used. Also, in the operation of the embodiment, the coating tank 1 is connected to the coating tank 9 for explanation. However, when the coating in the coating cartridge section 2 is sufficient, such a configuration is not adopted, and the coating can be filled after the application. Such a configuration may be adopted.
[0022]
【The invention's effect】
As described above, according to the present invention, since a pipe can be partially repaired by forming a uniform coating film on a required portion of a pipe with a simple apparatus configuration, the entire construction cost is reduced, and the conventional method is used. The construction time can be greatly reduced compared to the repair method.
[Brief description of the drawings]
FIG. 1 is an overall explanatory view of a coating apparatus. FIG. 2 is a front view of the coating apparatus. FIG. 3 is a rear view of the coating apparatus. FIG. 4 is an explanatory view of construction of the present invention. FIG. Description]
DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 Paint cartridge part 21 Piston mechanism 22 Main passage 23 Bottom plate 24 Air inlet 25 Air passage 26 Paint outlet 27 Sealing material 3 Turbine 31 Blade member 32 Bearing 33 Bolt 4 Towing material connecting part 41 Towing material 5 Sled portion 6 Paint hose 61 Check valve 7 First manhole 8 Winch 9 Paint tank 10 Second manhole 11 Suction hose 12 Suction device A Pipe line to be painted M Paint

Claims (4)

In an in-pipe coating apparatus which is introduced into the pipe from one end opening of the pipe and applies a coating material to the inner surface of the pipe to be coated while moving in the pipe,
The coating device is filled with a paint, and an outlet for the paint and an outlet for the paint are opened at a tip portion, and an air passage having a narrow passage cross-sectional area communicating with the outlet and the outlet is provided. Paint cartridge section,
The paint cartridge section is rotatably disposed at the center of the tip portion, and includes a turbine having a plurality of blade-shaped members and rotating with the flow of fluid,
The coating apparatus is introduced into the pipe from one end opening of the pipe to be coated from the front end side, the coating apparatus is guided to a predetermined position in the pipe, and the internal pressure in the pipe from the front side to the rear side of the coating apparatus is reduced. The paint flowing out of the outlet is mixed with the air passing through the air passage and is ejected from the outlet by applying a pressure difference so that the pressure rises, and the paint is uniformly applied to the inside of the pipe by the rotation of the turbine. An in-pipe coating apparatus, characterized in that: The cartridge portion is a cylindrical member having an outer diameter slightly smaller than the inner diameter of the pipe to be coated, and a sled member having a thickness corresponding to the slight amount is provided at a plurality of locations on the circumference of the cartridge portion. 2. The in-pipe coating device according to claim 1, wherein the coating device is configured as follows. The in-pipe coating apparatus according to claim 1, wherein a piston mechanism that moves by increasing or decreasing the paint is provided in the cartridge unit. A paint supply port for supplying paint into the cartridge is provided on the rear end side of the cartridge section, and the paint supply port is connected to a paint tank provided near an opening on the other end side of the pipe to be coated by a paint hose. The in-pipe coating apparatus according to claim 1, wherein:

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