JP3615606B2 - In-pipe coating equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an in-pipe coating apparatus that is introduced into a pipe and applies a paint to the inner surface of the pipe to form a thin uniform coating film on the inner surface 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 laying for many years, and in severe cases, leakage etc. will occur and proper maintenance management Has become difficult.
[0003]
In recent years, various in-pipe repair methods have been proposed as countermeasures against such corrosion pipelines. As the construction method, first, the inside of the pipeline is cleaned using high-speed jet water or abrasives. Next, a resin is introduced into the pipe from one end opening of the pipe, and the resin is transported using pigs or air, and a resin lining method for forming a resin film on the pipe inner surface, or the lining tube is reversed or There are repair methods such as a lining lining method that is non-inverted and is applied to the inner surface of the pipe.
[0004]
[Problems to be solved by the invention]
However, in the case of the repair method described above, equipment for construction is large and the material cost of the lining material is expensive, so that the entire construction cost is increased. And since the pipe line in the early stage of corrosion only needs partial repair of the pipe line, there arises a problem that the construction cost for the repair becomes expensive.
In addition, in the case of communication pipelines, because cables according to the pipe diameter are laid in the pipe line, the problem arises that existing cables cannot be laid if the pipe inner diameter decreases due to the lining material. To do.
[0005]
The present invention has been devised in order to solve these problems, and has an object to provide an in-pipe coating apparatus that can be repaired at low cost, particularly for partial repair of existing pipelines. To do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an in-pipe coating apparatus that is introduced into a pipe from one end opening of a pipe and applies a coating material to the inner surface of the pipe to be coated while moving in the pipe. a cylindrical paint cartridge portion having a slightly smaller outer diameter than the inner diameter of the coated pipe, located on the distal end side of the paint cartridge unit, paint ejection portion having a plurality of injection holes communicating with said paint cartridge portion on the side surface And a uniform clearance is formed between the outer peripheral surface of the coating cartridge part and the inner surface of the pipe line when the coating apparatus is introduced into the pipe line to be coated. And a centering mechanism for positioning the coating apparatus in the center of the pipe to be coated. The coating apparatus is introduced into the pipe from one end opening of the pipe to be coated from the front end side. Predetermined position in the road The paint that flows out from the injection hole by the jet flow from the clearance is uniformly applied to the pipe by generating a negative pressure in the pipe on the other end side of the pipe to be coated. It is what.
[0007]
In the paint cartridge unit, a piston mechanism that moves by increasing or decreasing the paint is provided.
[0008]
Further, the centering mechanism is a sled member having a thickness corresponding to the clearance.
[0009]
Furthermore, a paint replenishing port for replenishing paint in the cartridge is provided on the rear end side of the paint cartridge unit, and the paint replenishing port and a paint tank provided in the vicinity of the opening on the other end side of the paint pipe are connected to a paint hose. It is characterized by having been connected by.
[0010]
[Action]
When the in-pipe coating apparatus having the above configuration is introduced into the pipe from the one end side of the pipe to be coated from the front end side, the coating apparatus is positioned at the center in the pipe line by the centering mechanism. Therefore, a clearance corresponding to the difference between the inner diameter of the pipe and the outer diameter of the coating apparatus, that is, the outer diameter of the coating cartridge portion, is generated around the coating apparatus.
Then, while maintaining the above-described state, the coating apparatus is moved to the painting target position in the pipeline by pumping with a wire holding tool or air. At this time, if the centering mechanism is a sled member, the movement in the tube is performed smoothly.
[0011]
Next, a negative pressure is generated in the pipe on the other end side of the coating apparatus in the pipe to be coated. As a means for that, a suction device or the like is connected to the other end side opening of the pipe to be painted for suction, or the other end side opening of the pipe to be coated is closed and pulled to one end side. This creates negative pressure. By generating a negative pressure in the pipeline, a jet flow is generated from the rear end side to the front end side of the coating apparatus through the clearance, and at the same time, a paint jet located on the front end side of the coating apparatus. The paint flows out by the negative pressure from the injection hole of the part. As a result, the paint that has flowed out is atomized by the jet stream, and a thin uniform coating film is formed on the inner surface of the tube.
[0012]
【Example】
Embodiments of the present invention will be described below 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 figure, the coating apparatus 1 is composed of a paint cartridge part 2, a paint ejection part 3, a traction material connecting part 4, and a sled part 5.
[0013]
The paint cartridge part 2 is a cylindrical member having an outer diameter slightly smaller than the inner diameter of the pipe A to be coated, and is made of a lightweight plastic or the like. The paint cartridge part 2 is filled with a paint M having a rust-proofing effect, and a communication passage 22 is formed at the tip part for communicating with a paint ejection part 3 to be described later.
Further, a piston mechanism 21 that moves to increase / decrease the paint M is provided in the cartridge 2, and a paint hose 6 is connected to the piston mechanism 21, and paint is supplied into the cartridge part 2 via a check valve 61. It can be refilled. The check valve 61 includes a valve body 61a that is slidably connected in the valve 61 (left and right in FIG. 1) and closes the inlet of the paint hose 6, and a spring 61b that elastically presses 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 cartridge M can be replenished by pushing the valve body 61a.
[0014]
The coating material ejection portion 3 is located on the distal end side of the coating material cartridge portion 2, and the outer shape is formed in a substantially conical shape having a tapered surface 31 inclined in the distal direction. As shown in FIG. A plurality of relatively small diameter injection holes 32 are provided at equal intervals along the circumference. Further, the injection hole 32 and the communication passage 22 are communicated with each other by an injection passage 33, and as a result, the injection hole 32 communicates with the paint cartridge 2.
[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. An external thread portion for screwing with the tip of the 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 23 a for inserting the paint hose 6 communicating with the piston mechanism 21.
[0016]
The sled portion 5 has a centering function for positioning the coating device 1 at the center of the pipeline A when the coating device 1 is introduced into the pipeline 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, and is evenly distributed along the circumferential direction in the front and rear of the paint cartridge 2 as shown in the figure. Eight are provided at intervals. The material is metal or plastic, and the surface is polished so that the frictional resistance with the inner surface of the pipe A is reduced.
[0017]
Next, the effect | action of the coating device 1 comprised as mentioned above is demonstrated using FIG. 4, FIG.
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 in the pipe A to be coated by the sled portion 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 part 2. The thickness of 140 mm and the sled part 5 is about 15 mm. Then, a clearance of about 15 mm, which is the thickness of the sled portion 5, is generated around the coating apparatus 1 by the difference between the inner diameter of the pipe A and the outer diameter of the coating cartridge portion 2.
Further, when the coating apparatus 1 is introduced into the pipeline A, the coating apparatus 1 is connected to the traction material 41 and is pushed by the winch 8 or the manual operation of the worker and smoothly introduced into the pipeline A. Or it is pumped by air and introduced. Furthermore, a paint hose 6 is connected to the coating apparatus 1, and the paint hose 6 is connected to a paint tank 9 installed in the vicinity of the first manhole 7.
[0018]
Next, after the coating apparatus 1 is moved to the painting target position in the coating line A, the suction apparatus 12 is connected to the opening of the coating line A from the second manhole 10 via the suction hose 11. Connecting. Then, the suction device 12 is driven to generate a negative pressure in the pipe line A between the coating device 1 and the second manhole 10 side, and the traction material 41 is wound up by the winch 8 so that the coating device 1 is Move to the 1 manhole 7 side at a constant speed.
[0019]
As shown in FIG. 5, when the operation is performed as described above, air flows in the pipe line A from the first manhole 7 side toward the second manhole 10 side due to the negative pressure. At this time, the air passes through the clearance, but since this clearance is very narrow with respect to the inner diameter of the pipe A, it becomes an orifice effect, and the flow velocity of the air passing through the clearance becomes very high and the jet. It becomes a flow. In addition, due to the negative pressure, the paint M filled in the paint cartridge part 2 flows out from the injection hole 32 through the communication passage 22 and the injection passage 33, and the outflowed paint M passes through the rear clearance. Nebulized by the coming jet stream. 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]
Further, as another means for generating a negative pressure in the pipe A to be coated, after the coating apparatus 1 is moved to the painting target position in the pipe A to be coated, an opening on the other end side of the pipe A Occlude. When the coating apparatus 1 is moved to one end side of the pipe A at a predetermined speed, the volume of the space between the opening on the other end side in the pipe A and the coating apparatus 1 is increased. The pressure in the space decreases and negative pressure is generated.
[0021]
Although the present embodiment has been described in detail above, in the in-pipe coating apparatus 1 according to the present invention, the centering mechanism has been described using the sled portion 5. However, the centering mechanism is not limited to this and has other centering functions such as blades. It may be used. Moreover, although the coating tank 9 was connected with the coating apparatus 1 in the effect | action of the Example, when the coating material in the coating material cartridge part 2 was enough, such a structure is not taken and a coating material can be filled after construction. Such a configuration may be adopted.
[0022]
【The invention's effect】
As described above, in the present invention, since the partial repair of the pipeline can be performed with a simple device configuration, the overall cost of the construction can be reduced, and the construction time can be significantly shortened compared to the conventional repair method. I can .
[Brief description of the drawings]
FIG. 1 is an overall explanatory view of the 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 installation explanatory view of the invention. Explanation of]
DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 Paint cartridge part 21 Piston mechanism 22 Communication path 23 Bottom plate 3 Paint ejection part 31 Tapered surface 32 Injection hole 33 Injection path 4 Tractive material connection part 41 Tractive material 5 Sled part 6 Paint hose 61 Check valve 7 First valve Manhole 8 Winch 9 Paint tank 10 Second manhole 11 Suction hose 12 Suction device A Painted pipeline M Paint

Claims (4)

In an in-pipe coating apparatus that is introduced into a pipe from one end opening of a pipe and applies a coating material to the inner surface of the pipe to be coated while moving in the pipe, the coating apparatus has an outer diameter slightly smaller than the inner diameter of the pipe to be coated. a cylindrical paint cartridge unit having, positioned at the front end side of the paint cartridge unit, and a paint ejection portion having a plurality of injection holes in a side communicating with said paint cartridge unit, on the circumference of the paint cartridge unit When the coating apparatus is installed in the pipe to be coated, the coating apparatus is placed in the pipe to be coated so that a uniform clearance is formed between the outer surface of the coating cartridge section and the inner surface of the pipe. A centering mechanism positioned at the center of the pipe, and the coating apparatus is introduced into the pipe line from one end opening of the pipe line to be coated from the front end side, the coating apparatus is guided to a predetermined position in the pipe line, On the other end of the paint pipe By causing the negative pressure in the road, pipe coating apparatus characterized by uniform application to the pipe paint flowing out of the injection hole by a jet stream from the clearance. The in-pipe coating apparatus according to claim 1, wherein a piston mechanism is provided in the paint cartridge portion so as to move when the paint is increased or decreased. The centering mechanism according to claim 1, wherein the centering mechanism is a sled member having a thickness corresponding to the clearance. A paint replenishing port for replenishing paint in the cartridge is provided on the rear end side of the paint cartridge unit, and the paint replenishing port and a paint tank provided in the vicinity of the opening on the other end side of the pipe to be painted are connected by a paint hose. The in-pipe coating apparatus according to claim 1.

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