JP2007152186A - Lining method of drain pipe pipe and lining accessory used for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lining method for forming a coating on the inner peripheral side of a drain pipe structured with a piping material of different caliber. <P>SOLUTION: The inside of the drain pipe MP is negatively pressurized by a suction apparatus 2 connected to a lower flowing end part PL of the drain pipe MP so that a coating material 3 is thrown in from an upper flowing end part PU of the drain pipe MP, thereafter, a spherical balloon 5 capable of being expanded and reduced in diameter is connected to an air compressor 7 through a flexible air feeding pipe 6 with flexibility. The compressor 7 adjusts the internal pressure of the balloon so that the balloon has a smaller diameter by the predetermined value than the caliber of the upper flowing end part PU to be thrown in. At the part of different caliber from the upper flowing end part PU in moving of the balloon 5 in the drain pipe MP, the air compressor 7 adjusts the internal pressure of the balloon 5 so that the balloon has a smaller diameter by the predetermined value than the part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drainage pipe lining method in which a protective coating film is formed after cleaning the inside of a drainage pipe of an apartment house such as a condominium or an office building, and a lining aid used in the construction method.

Conventionally, the drain pipe gradually adheres and accumulates organic substances, oils and fats, etc. due to use over time, and the inside becomes constricted. If left as it is, the deposit progresses and remains in the drain pipe. The part that could pass water (drainage channel) was completely clogged, or the drainage pipe itself was corroded, and due to the progress of corrosion, the drainage pipe was perforated and leaked. The deposit was periodically peeled and removed, and then a lining treatment was performed to form a protective coating with a suitable thickness on the inner surface of the drain pipe.
In the lining process, as disclosed in Patent Document 1, a repair resin is injected from the front end side of the construction pipe to be repaired in the building piping system, and the resin is blown and conveyed by an air flow toward the base end side. There is a method of forming a resin-lined coating film on the inner surface of a pipe.
However, in the above lining method, the paint in the drain pipe is simply blown and transported by airflow, so the coating film becomes thick and the coating film surface becomes uneven, and organic substances, oils and fats adhere after the coating film is formed Easy to deposit.
In order to eliminate such problems, drainage attached to a flexible wire after negative pressure is applied to the inside of the drainage pipe by a suction device connected to the downstream end of the drainage pipe, and paint is introduced from the upstream end of the drainage pipe. A lining method has been developed in which a sphere having a diameter smaller than the inner diameter of the pipe is introduced and the sphere is moved downstream in the drain pipe (see Patent Document 2).
According to such a lining method using a sphere, by moving the sphere while blowing away the part of the paint that is in close contact with the sphere by the suction force of the suction device, it is ensured that the entire inner peripheral surface of the drain pipe is thin and smooth. A film can be formed.

Japanese Patent Laid-Open No. 8-24783 JP 2003-269686 A

  However, the above-mentioned lining method using a sphere is effective if the drain pipes have the same diameter, but when the drain pipes are connected by pipes having different diameters, that is, the middle part of the drain pipe is spherical. On the other hand, if the caliber is small, the movement of the sphere is delayed and cannot proceed, and conversely, if the caliber is considerably large with respect to the sphere, there is a problem that the coating film at that part is not formed to an appropriate thickness. .

  The present invention relates to an air compressor that uses a suction device connected to the downstream end of a drain pipe to make negative pressure in the drain pipe, and after introducing paint from the upstream end of the drain pipe, through a flexible air delivery pipe A spherical balloon that can be expanded and contracted is connected to the upstream end of the upstream end while adjusting the internal pressure with an air compressor so that the diameter is smaller than the diameter of the upstream end by a predetermined value. The above-mentioned problem is solved by adjusting the internal pressure of the balloon with an air compressor so that the diameter of the balloon is smaller by a predetermined value than that of the part having a different diameter.

In short, the present invention is a drainage pipe formed by connecting pipe materials having different diameters using a spherical balloon with an expandable and contractible diameter formed by connecting to an air compressor via a flexible air delivery pipe. By adjusting the internal pressure of the balloon with an air compressor so that the balloon diameter is smaller than the diameter by a predetermined value according to the diameter of the drain pipe that changes during the movement of the balloon in the drain pipe, the balloon is placed in the drain pipe having the above configuration. Can be moved without difficulty.
Therefore, during the movement of the balloon in the drain pipe after the paint has been put into the drain pipe that has been made negative pressure by the suction device, the adhesion portion of the paint balloon adhering to the inner peripheral surface of the drain pipe with a certain thickness is sucked. When blown away by the suction force of the device, the high-speed airflow passes through the narrow gap between the paint and the balloon generated by this, so the high-speed airflow stretches the paint thinly during the passage and smoothes the paint surface. By extending the paint and smoothing the paint surface continuously by the progress of the balloon in the drainpipe, a thin and smooth coating can be reliably formed on the entire inner peripheral surface of the drainpipe.
In addition, since the balloon is connected to the air delivery pipe, it is easy to reciprocate the balloon between the upstream and downstream of the drain pipe, and not only during the forward movement of the balloon, but also during the return movement to collect the balloon, Similarly to the above, the surface of the paint can be leveled, and a more appropriate coating film can be formed.
In addition, the balloon is guided downstream in the drain pipe by suction of the suction device, and the air delivery pipe is flexible, so even if the drain pipe has a bent portion, it follows the bend. Therefore, practical effects such as being able to form a coating having an appropriate thickness in the same manner as described above for any pipe shape are significant.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view showing a drain pipe lining method according to the present invention, and FIG. 2 is an enlarged sectional view showing a coating film forming process.
As shown in FIG. 1, the drainage pipe MP passes through each level in an apartment, etc., and branches horizontally extending branch pipes SP extending from the drainage pipe MP in the left-right direction for each level. A branch pipe TP connected to a drain outlet of a water place (kitchen, washroom, etc.) is branched.
In FIG. 1, the drain pipe MP and the laterally extending branch pipe SP are connected to other parts of the drain pipe MP through a collective joint (not shown) having a large diameter.

In this running method, the upper part of the drainage pipe MP above the connection with the uppermost horizontal branch pipe SP and the lower part of the connection with the lowermost horizontal branch pipe SP are cut in advance. To do.
Hereinafter, in the drain pipe MP, the upper and lower cut portions are referred to as an upstream end portion PU and a downstream end portion PL, respectively.

After the cutting of the drain pipe MP, the inner peripheral surface of the drain pipe MP is cleaned.
In this cleaning, first, the drainage port of all drainage branch pipes TP communicating with the drainage pipe MP is closed, and the air in the drainage pipe MP is sucked into the downstream end PL of the drainage pipe MP via the pressure hose 1. The suction device 2 is connected, the suction device 2 is operated, air is circulated inside the drain pipe MP, and the deposits on the inner peripheral surface of the drain pipe MP are dried.
After the drainage pipe MP is dried, the abrasive is introduced from an abrasive feeding machine (not shown) connected to the upstream end PU of the drainage pipe MP, whereby the abrasive is a high-speed air flow generated by the suction force of the suction device 2. Then, it is transported from upstream to downstream, dispersed in the drain pipe MP in the course of transport, and blown off in a random direction at a high speed to polish the inner peripheral surface of the drain pipe MP.
The removed deposits and abrasives on the inner peripheral surface of the drain pipe MP are stored in a storage tank (not shown) of the suction device 2 through the pressure hose 1.
When removal of the deposits is completed, the supply of the abrasive is stopped, and cleaning water is put into the drain pipe MP instead of the abrasive.
The cleaning water cleans the inner peripheral surface of the drain pipe MP with a high-speed air flow generated by the suction force of the suction device 2, and the cleaning suspension water is stored in the storage tank of the suction device 2 through the pressure hose 1.
After the cleaning, the suction device 2 causes air to flow through the drain pipe MP to dry the polished inner peripheral surface of the drain pipe MP.
The cleaning is not limited to the above-described method of polishing the inner peripheral surface of the drain pipe MP with a high-speed airflow, and the deposits on the inner peripheral surface of the drain pipe MP may be removed by other cleaning methods.

After the drying of the inner peripheral surface of the drain pipe MP from which the deposits have been removed, the lining method is applied.
In the present lining method, the suction device 2 used for the cleaning is also used.
Below, the coating material 3 and the lining auxiliary tool 4 which are mainly used by this lining construction method besides the suction device 2 are demonstrated.
The paint 3 is obtained by kneading an epoxy resin-based paint, a fine aggregate, and a viscosity modifier at an appropriate mixing ratio.
The fine aggregate is a scaly glass powder, has acid resistance in itself, has a barrier function when the glass powder is arranged on the surface of the coating, extends the life of the coating, and prevents cracks and It becomes possible to improve chemical resistance.
The viscosity modifier is made of active silica such as Aerosil, and has the effect of reinforcing the coating film at the same time as adjusting the viscosity and thixotropy of the paint depending on the mixing ratio.

The lining aid 4 includes a spherical balloon 5 made of synthetic rubber that can be expanded and contracted, and an air compressor 7 that is connected to the balloon 5 via a flexible air delivery pipe 6.
The balloon 5 is subsequently introduced into the drain pipe MP after the paint 3 is put into the drain pipe MP, and is moved through the drain pipe MP by adjusting the feeding length of the air delivery pipe 6 to the drain pipe MP. During the movement, the internal pressure of the balloon 5 is adjusted by the air compressor 7 so as to make the balloon diameter (diameter) smaller than the diameter by a predetermined value according to the diameter of the drainage pipe MP that changes due to the collective joint or the like. .
Although the air delivery pipe 6 employs a pressure-resistant synthetic fiber hose, it is fed out following the balloon 5 pulled by the suction force of the suction device 2, so that the tensile force In order to be able to withstand, a reinforcing material such as a mesh-like glass fiber is provided in the thickness of the hose.

And in this lining construction method, the coating material 3 is thrown in into the inside from the upstream end part PU of the drain pipe MP in the state which act | operated the said suction device 2. FIG.
After the charging of the paint 3, the balloon 5 is continuously charged from the upstream end PU.
At this time, the internal pressure of the balloon 5 is adjusted by the air compressor 7 so that the diameter of the balloon 5 is smaller than the diameter of the upstream end PU by a predetermined value.
Note that an endoscope (not shown) is also provided at the upstream end PU in order to confirm that the diameter of the balloon 5 changes during the movement of the balloon 5 in the drain pipe MP due to the pipe material and the collective joint constituting the drain pipe MP. From.

When the balloon 5 is inserted into the drain pipe MP, it is pulled downstream by the suction force of the suction device 2, but the movement of the balloon 5 is adjusted so that it gradually proceeds according to the feeding length of the air delivery pipe 6. Yes.
In the drain pipe MP, when a part having a diameter different from that of the upstream end PU is confirmed by the endoscope, the internal pressure of the balloon 5 is adjusted by the air compressor 7 so that the balloon diameter is smaller than the part by a predetermined value. .
The balloon 5 is guided downstream in the drain pipe MP by the suction of the suction device 2, and the air delivery pipe 6 has flexibility, so the drain pipe MP has a bent portion. However, it can move following the bending.
During the movement of the balloon 5 in the drain pipe MP, the close contact portion of the paint 3 adhered to the inner peripheral surface of the drain pipe MP with a certain thickness is blown away by the suction force of the suction device 2. Thus, the high-speed airflow passing through the narrow gap formed between the paint 3 and the balloon 5 stretches the paint 3 thinly and smoothes the surface of the paint 3, and this is the progress of the movement of the balloon 5. Repeated during.

When the balloon 5 reaches the downstream end PL of the drain pipe MP, the air delivery pipe 6 is pulled back and the balloon 5 is gradually pulled.
When the balloon 5 is pulled, the same thing as described above is performed.
That is, the convex portion on the surface of the paint 3 that has not been leveled by the movement of the balloon 5 from the upstream to the downstream is in close contact with the balloon 5, or the protruding portion passes through the gap between the balloon 5 and the paint 3 even if it does not adhere. When the surface of the paint 3 is leveled by being blown off or stretched by the high-speed airflow, a smooth and thin coating film 3 is formed on the entire inner peripheral surface of the drain pipe MP.
Even during the movement of the balloon 5, the internal pressure of the balloon 5 is adjusted by the air compressor 7 so that the balloon diameter is smaller than the diameter by a predetermined value in accordance with the diameter of the drainage pipe MP changing as described above. To do.
When the balloon 5 is thus recovered from the upstream end PU of the drain pipe MP, the suction device 2 is stopped.
Thereafter, the inside of the drain pipe MP is visually confirmed with an endoscope, and if it is not completed, the same operation is performed again.
The excess paint blown off by the airflow is stored in the storage tank of the suction device 2 through the pressure hose 1.
And after it was confirmed that the coating film 3 was formed on the whole inner peripheral surface of the drain pipe MP, a hot air blower (not shown) is connected to the pressure hose 1 and the hot air from the hot air blower is supplied. The coating film 3 is dried and cured through the drain pipe MP.

It is the schematic which shows the lining method of the drain pipe which concerns on this invention. It is an expanded sectional view which shows the formation process of a coating film.

Explanation of symbols

2 Suction device 3 Paint 5 Balloon 6 Air delivery pipe 7 Air compressor P Drain pipe M
PL Downstream end PU Upstream end

Claims (2)

  The suction pipe connected to the downstream end of the drain pipe creates a negative pressure in the drain pipe, and after charging the paint from the upstream end of the drain pipe, it is connected to an air compressor via a flexible air delivery pipe. A spherical balloon with a freely expandable / contractible diameter is introduced by adjusting the internal pressure with an air compressor so that the diameter is smaller than the diameter of the upstream end by a predetermined value, and the diameter of the balloon is different from that of the upstream end during movement in the drainage pipe of the balloon. A drain pipe lining method characterized in that an internal pressure of a balloon is adjusted by an air compressor so that a balloon diameter is smaller than the part by a predetermined value.   The suction pipe connected to the downstream end of the drain pipe is used for a drain pipe lining method in which the inside of the drain pipe is negatively pressurized and paint is introduced from the upstream end of the drain pipe. A spherical balloon that can be expanded and contracted in a drainage pipe continuously after being charged, and an air compressor that is connected to the balloon via a flexible air delivery pipe. During the movement of the balloon in the drainage pipe, A lining aid for use in a lining method for a drain pipe, wherein the internal pressure of the balloon is adjusted by an air compressor so that the balloon diameter is smaller than the diameter by a predetermined value according to the diameter of the drain pipe that changes.

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