JP3188495B2 - Rehabilitation method of drain pipe inner surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of rehabilitating an inner surface of a drainage pipe for discharging existing sewage in a building, a high-rise apartment building, and the like, and is used for the rehabilitation work.

[0002]

2. Description of the Related Art A drain pipe connected to a drain of a sink, a wash basin or the like is one step larger on each floor of a drain pipe existing in a structure such as a building by a joint such as a cheese. The drainage horizontal pipe is connected to a large-diameter drainage vertical pipe installed vertically in the structure while maintaining a predetermined flow gradient. Conventionally, the following technical difficulties have been encountered in rehabilitation of the inner surface of the drainage pipe, particularly formation of a new coating film. That is, even if the paint is injected from the open end of the drain pipe connected to the appliance, and the paint is swirled by the air to give a lining, the paint does not swirl immediately from this open end. No coating film is formed on the entire inner surface up to the distant part, and on the inner wall surface of the curved joint such as an elbow, the inner diameter suddenly becomes larger than the diameter of the pipe, so the swirl flow of the coating is broken and uniform However, a problem arises in that an uncoated film cannot be formed, and the uncoated portion particularly at the joint portion. Furthermore, on the inner wall surface of the horizontal drainage pipe near the connection with the vertical drainage pipe, the air for moving the paint diffused into the large-diameter vertical drainage pipe and the wind pressure decreased, so that the coating film was not reliably formed. .

To solve this problem, the present applicant has provided a method disclosed in Japanese Patent Application No. 3-74177. This is because the drainage horizontal pipe is cut near the connection part of the drainage vertical pipe, and the drainage pipe between the open end obtained by the cutting and the open end connected to each of the above-mentioned appliances is cleaned, dried, epoxy resin paint. To form a coating film.

[0004]

However, since each drainage horizontal pipe is usually laid inside the floor structure of each floor,
In order to cut off the drainage horizontal pipe, it is necessary to peel off the floor plate or ceiling plate of that part on each floor, and it is necessary to restore this floor plate etc. after completion of rehabilitation work, and these extra work There are difficulties that require time, personnel, equipment and materials. Further, the cut point of the drainage horizontal pipe is reconnected after the rehabilitation work, but even if water leakage was completely prevented, there was a risk that water would leak from this part after many months.

The present invention has been developed based on the above-mentioned patent application as a result of various studies for solving the problems. The present invention has been applied to a structure such as a building in which the existing drainage pipe is kept as it is. The cleaning is performed so that a smooth coating film having a uniform thickness can be formed on the entire inner wall surface of the drainage pipe including the different-diameter pipes and the bent joints of different diameters. In the present invention, the pipe line of the drainage pipe includes a rising drainage pipe connected to the drainage outlet of each appliance, a horizontal drainage pipe, and a horizontal pipe portion buried underground of a vertical drainage pipe.

[0006]

In order to achieve the above-mentioned object, a method of the present invention is to clean and dry a line of a horizontal drain pipe connected to a vertical drain pipe, and to dry the pipe from any open end of the drain pipe in the flow direction. Give a swivel motion and inject and distribute a predetermined amount of epoxy resin paint, before curing, connect an arbitrary number of telescopic balls slightly smaller than the maximum diameter of the pipe to be processed, connect the rope to the last ball, This ball is inserted into the pipe from the open end and moved by air, and after the ball is discharged from the end of the horizontal drain pipe, the ball is returned by the rope while continuously supplying air and taken out from the open end. Forming a uniform and smooth coating film on the inner surface of the tube by a jet stream of air ejected from the gap between the ball and the inner surface of the tube wall; Characterized by There.

[0007]

After cleaning and drying the drain pipe and the horizontal drain pipe, a predetermined amount of epoxy resin paint is injected from the open end of the drain pipe in a swivel motion with respect to the flow direction. It is applied to the inside of the pipe from the inner wall. Then, connect any number of telescopic balls with a diameter slightly smaller than the maximum diameter of the pipe to be processed with a string, connect the rope to the last ball, insert it into the pipe and move it by air, and the ball and the inner wall of the pipe wall Because the gap is narrow, the air passing through this gap is accelerated and jetted as a jet stream in a ring shape in the direction of travel, and the paint slightly in front of the ball is wound up on the inner surface of the tube wall, stretched, and traversed. A coating film is continuously formed by flowing in a plane ring shape. Since the annular flow of the paint is generated by the jet stream of air as long as the gap exists, the inner wall surface of the drainage pipe, as well as a drainage horizontal pipe having a diameter one step larger than the drainage pipe, and a bent joint such as an elbow or the like having a larger inner diameter. A coating film is formed on the inner wall surface in the same manner. Also,
The coating film is surely formed also on the inner wall surface at the end of the drain horizontal pipe connected to the large-diameter vertical drain pipe and at the end of the drain pipe.

At the time of the return movement of the two balls, the two jets move against the air to be sent, so that the jet flow becomes stronger, and the paint film once formed by the annular flow at the time of forward movement is further formed into a continuous film. I do. In addition, since both balls move at a predetermined interval linked by a string, the first continuous film formation is performed behind the ball that becomes the front during the return movement, and the rear of the ball that becomes the last during the return. Finally, since a continuous film is formed, the traces of rope abrasion etc. generated on the coating film are completely repaired and formed to a smooth finish, and a uniform and smooth coating film is formed on the inner surface of the tube wall. You. Further, since the continuous formation of the coating film is performed in two directions by reciprocating movement of both balls, a coating film is completely formed even at a joint portion with a bending joint such as an elbow, so that no coating remains.

[0009]

FIG. 1 shows an example of a drainage pipe of an arbitrary floor in a high-rise apartment building. Reference numeral 1 denotes a vertical drainage pipe, 2 denotes a horizontal drainage pipe, and the horizontal drainage pipe 2 includes, for example, a kitchen, The rising drain pipes 3, 4, and 5 connected to the drains of the wash basin and bathroom appliances are connected by a cheese or the like 2a, and the drain pipe in the present invention is a drain horizontal pipe, Includes drainpipe.

In this method, the inside of the drain pipe is cleaned as a pretreatment. For this cleaning, a conventional means can be selected and used, but in this method, a tube 8 having an injection nozzle 7 at the tip is sequentially inserted from the open ends 3a, 4a, and 5a of the drain pipes 3, 4, and 5 respectively. Through the horizontal drain pipe 2 to the vertical drain pipe 1, and jet water jets from the nozzle 7 to remove residues, slime, and the like in the pipe. FIG. 1 shows this for the drain pipe 5.

Next, as shown with respect to the drain pipe 4 in FIG. 1, wires 10 each having a screver 9 at the end are sequentially inserted into the drain pipes 3, 4, and 5, and inserted into the drain vertical pipe 1 in the same manner as described above. Then, the tip of the scever 9 is brought into contact with the inner surface of the tube wall by the wire 10 to reciprocate. As a result, semi-solid matter, rust, etc. attached to the inner surface of the tube wall are scraped off. At this time, if the number of blades of the scraper 9 is increased stepwise, for example, from 15 to 30, the attached matter in the pipe is completely and completely scraped from rough rust to fine attached matter. . When the scraping is completed, water is passed through the pipe to wash off the deposits.

When the aging of the inner surface of the tube wall is relatively light, the screwer 9 is immediately reciprocated in the tube without washing the tube by the high-pressure jet water flow to remove the deposits on the inner surface of the tube wall. It may be scraped and then washed.

After the above-mentioned cleaning step is completed, hot air is sequentially or simultaneously sent from the open ends of the drainage pipes 3, 4 and 5 to blow out the drainage vertical pipes 1, and the inside of the pipes is thoroughly dried.

Thereafter, as shown for the drain pipe 3 in FIG. 1, a predetermined amount of epoxy resin paint is injected from the opening end 3a. For this injection, a trap tube injection device 11 developed by the present applicant is used. When paint is filled in the trap tube and air is supplied from the air compressor 12 at a predetermined pressure, the trap tube is injected into the trap tube. The paint flows while flowing in a direction perpendicular to the flow direction and enters the drain pipe 3. Therefore, the drain pipe 3 has an open end 3 at its starting end.
The paint is immediately applied from the inner wall surface of a.

After the above paint is distributed and before it is cured, FIG.
As shown in the figure, an arbitrary number (two in this embodiment) of elastic balls 13 and 14 are connected by an appropriate connecting cord 15, and a rope 16 is connected to the rear surface of the rearmost ball 14 to open end 3a.
The ball is moved by sending air to the tube. This stretchable ball is formed of a stretchable synthetic resin material such as urethane foam, and has a diameter slightly smaller than the maximum diameter of the pipe to be processed. Specifically, in this embodiment, the diameter of the drain horizontal pipe 2 is 50 mm, and the diameter of the drain pipe 3 is 4 mm.
In the case of 0 mm, a ball having a diameter of 36 to 38 mm was used. The air pressure for moving these two balls is set to 0.
The range of about 3 to 1.0 kg / cm ² is sufficient, and when sending air to the drain pipe 3, the open ends of the other drain pipes 4 and 5 are closed with an appropriate member.

FIG. 4 shows the action of the two balls in the tube. The air sent into the tube first presses the rear ball 14 and flows forward from the gap (m) with the inner surface of the tube wall. Since the ball 13 blows forward from the gap (m) between the ball and the inner surface of the tube wall while pressing the ball 13 at the front, both balls move in the tube in a levitated state without contacting the surrounding tube wall. .

The air passing through the gap (m) is accelerated due to the narrow gap, and is jetted as a jet stream in a ring shape with respect to the traveling direction. The air pressure at the front of the ball is approximately 2-3 kg / cm ² . For this reason, the paint (P) distributed slightly in front of the ball is wound up by the jet flow, is stretched up on the inner surface of the tube wall, flows in a ring shape in cross section, and is formed into a continuous film. A coating (p ₁ ) having a thickness corresponding to the gap (m) is formed on the inner surface of the tube wall through which the ball has passed. Since the annular flow of the paint is generated by an air jet flow as long as the gap (m) is present, the drain horizontal pipe 2 having a diameter one step larger than the drain pipe 3, the elbow having a large inner diameter, and a curved joint 2a such as a cheese are provided.
Similarly, a coating film is formed on the inner wall surface and the joint between the joint and the pipe. Further, the coating film is reliably formed up to the inner wall surface at the end of the horizontal drainage pipe 2 connected to the large-diameter vertical drainage pipe 1.

When the balls 13 and 14 move forward,
Because the air pressure in the space between the two balls fluctuates finely, and both balls move in the tube while gradually approaching and separating,
The above-described action is mainly performed by the leading ball 13.

When the two balls have thus escaped into the drainage vertical pipe 1 (indicated by the dashed line in FIG. 2), as shown in FIG. Remove from end 3a. Also in this return movement, the jet flow of the air described above is generated behind both balls, but since both balls move against the air to be sent, the jet flow becomes stronger, and the annular flow at the time of forward movement causes The paint film once formed into a film is further formed into a continuous film. Further, since both balls move at a predetermined interval connected by the string 15, the first continuous film formation is performed behind the ball 14 which becomes the leading position at the time of the return movement, and the ball which becomes the last position at the time of the return movement After the film 13 is finally formed into a continuous film, abrasion marks of the rope 16 formed on the coating film are completely repaired and formed into a smooth finish, and the inner surface of the pipe wall has a uniform and smooth coating. A film is formed. Further, due to this return movement, a coating film is sufficiently formed also on a joint portion between the bent joint 2a and the pipe, which was on the forward path side when the ball moved forward.

The above-mentioned coating film is formed on the pipe of the first drain pipe 3 and then from the second drain pipe 4 to the drain vertical pipe 1.
, And sequentially from the third drain pipe 5 to the drain vertical pipe 1 in the same manner.
A smooth coating film having a uniform thickness is also formed on the inner wall surface of the branch portion of the conduit by the bent joint 2a such as an elbow or cheese.

FIG. 5 shows an embodiment in which the present method is applied to a horizontal pipe portion 1a buried underground of a drainage vertical pipe 1. In this case, the drainage vertical pipe 1 is cut at an appropriate position on the ground, and the above-described method is performed from the open end 1b. The operation is exactly the same. In the figure, reference numeral 17 denotes a drainage basin.

[0022]

As described above, according to the present invention, the following effects can be achieved. (A) Since a predetermined amount of epoxy resin paint is injected by giving a swirling motion in the flow direction from the open end of the drain pipe, the paint is surely applied to the entire inner wall surface of the open end of each drain pipe,
Therefore, a coating film can be formed immediately from this open end, and no unpainted portion is formed on the entire surface of the drain pipe and the drain horizontal pipe. (B) An arbitrary number of telescopic balls having a gap between the inner surface of the pipe wall are connected with a string, and a rope is connected to the last ball.
By inserting it into the pipe from the open end and moving it forward with air and returning it with a rope while sending air, an annular flow is generated in the paint by the jet flow of air generated from this gap, and continuous coating is formed. It can be made, especially at the time of return movement, the coating film is formed in multiple stages according to the number of connected balls, so that the thickness of the coating film is uniform, and the coating film is finished smoothly by the last ball Good water flow. (C) The elastic ball keeps a gap between the inner wall surface and the pipe even if the diameter of the pipe is different by one step, and the jet flow of air creates an annular flow in the paint to form a continuous film. The existing drainage line including the different-diameter pipes and the different-diameter bent joints can be surely rehabilitated in the same state without leaving unpainted portions in the pipes.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing one embodiment of a rehabilitation method of the present invention.

FIG. 2 is an explanatory diagram of an operation at the time of forward movement of a ball.

FIG. 3 is an operation explanatory view at the time of a return movement of a ball.

FIG. 4 is an explanatory diagram of an operation of forming a continuous film by a jet flow of a telescopic ball.

FIG. 5 is a conceptual diagram of an embodiment applied to an underground horizontal pipe portion of a drain vertical pipe.

[Explanation of symbols]

1 ... drainage vertical pipe 2 ... drainage horizontal pipe 3,4,5 ... drainage pipes 3a, 4a, 5a ... open end 7 ... injection nozzle 9 ... scraper 13 ... elastic ball 16 ... rope m ... gap p ... paint p ₁ … Coat

Claims (1)

(57) [Claims] 1. A drain horizontal pipe and a drain pipe connected to a vertical drain pipe are cleaned and dried, and a predetermined amount of epoxy resin paint is injected and distributed by giving a swirling motion in the flow direction from an open end of the drain pipe. Before curing, an arbitrary number of telescopic balls having a diameter slightly smaller than the maximum diameter of the pipe to be processed are connected to each other, a rope is connected to the last ball, and this ball is inserted into the pipe from the opening end and air is applied. After the ball is discharged from the terminal of the drain pipe, the air jet is ejected from the gap between the ball and the inner surface of the pipe wall by continuously moving the air and returning by the rope and moving it out of the opening end. A method for rehabilitating the inner surface of a drainage pipe, characterized in that a uniform and smooth coating film is formed on the inner surface of the pipe by a flow, and then a coating film is formed on another pipe in the same manner.