JP4295893B2 - Rehabilitation of drainage branch pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for rehabilitating drainage branch pipes, and more specifically, for example, in a multi-storey apartment house such as a condominium, for example, living water around each floor connected to one drainage main pipe which is a common drainage facility. The present invention relates to a drainage branch rehabilitation method for renewing a dedicated drainage branch pipe extending from a facility.
[0002]
[Prior art]
Conventionally, in middle- and high-rise apartments such as condominiums, the drainage pipes (drainage branch pipes in the exclusive areas of each floor) that extend from living water facilities such as toilets, kitchens, and bathrooms on each floor are one drainage that is a common water distribution facility. It is connected to the main pipe, and the domestic wastewater from each floor is gathered in this drain main pipe and drained into sewage or septic tanks. In other words, in middle- and high-rise apartments, etc., drainage branch pipes for each floor are connected to at least one drainage main pipe.
[0003]
Rehabilitation of such drainage branch pipes has not been carried out in the past because the shape of the drainage port is very complicated, the installation of temporary piping is difficult, and the construction period is limited. Recently, the inside of the drainage branch pipe is evacuated from the end of the drainage main pipe with a large suction device, the abrasive branch pipe in each floor exclusive part is sucked with air and abrasives and paint from the drain outlet, and the inner surface of the drainage branch pipe is polished and Techniques for painting have been proposed, and more specific construction techniques are being studied with the aim of practical application.
[0004]
[Problems to be solved by the invention]
However, the proposed method for rehabilitating the drainage branch pipe described above is to suck the abrasive or paint introduced from the drain outlet of each drainage branch pipe with a large suction device attached to the end of the drainage main pipe. In order to flow in the tube, a considerable suction pressure is required. However, even when suction is performed with a practical suction device, the maximum differential pressure that can be taken between the suction device and the drain is up to 90 KPa.
[0005]
The diameter of a drainage branch pipe, such as a miscellaneous drainage branch pipe in an apartment house, is usually 32A to 65A, and in the case of a drainage branch pipe for sewage, it is 80A. When polishing by sending an abrasive such as silica sand into the corroded galvanized steel pipe with air, the required air flow rate depends on the pipe diameter and the length of the pipe, but at least about 60 m / sec is required. When the rust in the tube is strong, a flow rate of about 100 m / sec or more is required.
[0006]
For this reason, it is very difficult to obtain the flow rate necessary for rehabilitation of these drainage branch pipes only by the suction force by the suction device, and even if the largest known suction device is used, the drainage pipe Depending on the tube length and tube diameter, it is considered that the limit is about 60 m / sec.
[0007]
In addition, even when the inner surface of the drainage branch pipe is painted and rehabilitated, if the paint is made to flow along with the air flow into the drainage branch pipe, the paint becomes an annular two-phase flow so that the upper part of the horizontal pipe can be painted. Depending on the viscosity of the paint, an air flow rate of 50 m / sec or more is required. However, as described above, the conventional suction device has a problem that it is difficult to stably obtain such a flow rate depending on the length and diameter of the drain pipe.
[0008]
For this reason, it has also been proposed to send abrasives or paints to the drain branch using pressurized air. In this case, a large amount of air flows at a high speed, so that the pressure in the pipe rises. A serious problem may occur in that dirty air is ejected from living water facilities such as toilets, kitchens, and bathrooms on each floor by flowing back to the drainage branch pipes in the exclusive sections of each floor connected to the main pipe.
[0009]
In this case, it is enough to close the drain outlets of the drainage branches on each floor connected to the main drainage pipe with a lid or the like. This is often difficult due to the structure of the drain. For this reason, it is conceivable to separate the drainage branch pipe and the drainage main pipe at the joint, but the joint is usually embedded in the concrete and is often difficult to separate.
[0010]
An object of the present invention is to solve such a conventional problem. For example, in a multi-storey building such as an apartment, each floor connected to one drainage main pipe which is a common drainage facility. Drainage branch that is refurbished in a short period of time and properly polished and painted without disconnecting the drainage branch pipe and drainage main pipe of each floor from the inner surface of the dedicated drainage branch pipe extending from the facility around the water It is to provide a method for rehabilitating a tube.
[0011]
[Means for Solving the Problems]
The present invention is a drainage branch rehabilitation method, and is configured as follows to solve the above-described technical problem. That is, the present invention is a method for rehabilitating a drainage branch pipe that collects and drains drainage from drainage branch pipes piped to the exclusive part of each floor in a building having two or more floors, Pressurized air is sent from the outlet of one drainage branch pipe selected from a large number of drainage branch pipes, and the regenerated material is put on this pressurized air stream and supplied to the drainage branch pipe so that it flows through the pipe at an appropriate flow rate. At the same time, the air in the pipe is sucked from the lower end of the drainage main pipe to which the drainage branch pipe is connected. At that time, the drainage outlet of the other drainage branch pipe, the drainage outlet of the drainage branch pipe on the other floor, The upper end opening of the drainage main pipe is closed, and the pressure at the connection between the drainage main pipe and the drainage branch pipe being rehabilitated is reduced to atmospheric pressure or lower in relation to air suction in the drainage main pipe. Either air supply pressure or suction pressure drawn from the drainage main pipe Or characterized in that it is composed to control both.
[0012]
<Specific Configuration in the Present Invention>
The drainage branch rehabilitation method of the present invention is composed of the above-described essential components, but it is valid even when the components are specifically as follows. The specific component is a polishing material in which the rehabilitation material removes deposits in the drainage branch pipe and polishes, and the abrasive is recovered by sucking the air inside from the lower end of the drainage main pipe. Features.
[0013]
The same applies to the case where the rehabilitation material is used as a paint and the inner surface of the drainage branch pipe after polishing is painted and rehabilitated. Further, the drainage branch pipe rehabilitation method of the present invention is preferably applied to the rehabilitation of the exclusive drainage pipe that flows the drainage from the living water facilities of the exclusive area of each floor to the drainage main pipe in the apartment house.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the drainage branch rehabilitation method of the present invention will be described in more detail with reference to the drawings with respect to preferred embodiments thereof. One embodiment of the present invention is a case where a dedicated branch pipe or drainage branch pipe connected to a drainage main pipe installed in a multi-storey building is rehabilitated. A drainage drain main pipe 10 in a house and dedicated drainage branch pipes 11a, 11b, 11c,... Piped to each floor exclusive part connected to the floor are schematically shown.
[0015]
In FIG. 1, A, B, and C respectively indicate drains of the drain branch 11a. For example, when the building is a housing complex, A is a kitchen drain, B is a bathroom drain, and C is a wash drain. And D shows the connection point 12a between these drainage branch pipes and the drainage main pipe 10. In addition, 12b, 12c,... Indicate connection points between the drainage main pipe 10 and the drainage branch pipes 11b, 11c, 11d,.
[0016]
When the inner surfaces of such existing drainage branch pipes 11a, 11b, 11c,... Are rehabilitated, they are first polished to remove iron rust, dirt, etc. adhering to the inner surfaces. As a polishing method at this time, as shown in FIG. 1, when the drainage branch pipe 11a on the fifth floor of the uppermost floor is rehabilitated, heated air is supplied from the drainage ports A, B, C to dry the drainage branch pipe. . When the dirt in the pipes is severe, it is preferable that each drainage branch pipe is roughly cleaned in advance with high-pressure jet water.
[0017]
Next, the opening 13 communicating with the uppermost part of the drainage main pipe 10 and the drainage outlets of the drainage branch pipes 11b, 11c, 11d,. . A hose with one end connected to an air distributor 25 connected to the air compressor 14 by a hose 16 and a polishing material charging machine 15 interposed in the drainage port A of the drain section 11a of the drainage branch pipe 11a to be rehabilitated. The other end of 22 is inserted. The other drainage ports B and C are also connected to the air distributor 25 by the hoses 23 and 24. Furthermore, a pressure gauge 27 for detecting the pressure at the upper part of the drainage main pipe is installed near the air distributor.
[0018]
Thereafter, the air compressor 14 is operated, and the pressurized air mixed with the silica sand as the abrasive is fed into the AD section of the drainage branch pipe 11a by the abrasive charging machine 15. At this time, when the pipe diameter of the drainage branch pipe 11a is 50A, the pressure of the air to be fed is such that the flow rate in the pipe diameter is 13 m ³ / min corresponding to 100 m / sec. The distribution valve of the air distributor 25 is adjusted while observing the air flow rate. At this time, the distribution valve of the air distributor 25 connected to the drain ports B and C is slightly opened to flow air to prevent the abrasive from flowing back to the drain ports B and C.
[0019]
On the other hand, a hose 20 extending from the suction device 17 through the dust collector 18 and the abrasive separator 19 is connected to the lower end of the drainage main pipe 10, and air in the drainage main pipe 10 is sucked. At this time, when the diameter of the drainage main pipe is 65A and the drainage branch AD section is 8m, the suction force by the suction device 17 is adjusted to minus 18 KPa so that the pressure of the drainage branch A is 50 KPa. Then, when the air flow rate is 13 m ³ / min, the pressure in the pipe at the connection point 12a between the drainage main pipe 10 and the drainage branch pipe 11a becomes substantially atmospheric pressure or lower. Then, the pressure in the drainage main pipe is confirmed by a pressure gauge 27 that detects the upper pressure of the drainage main pipe.
[0020]
Usually, the pipe diameter of the drainage main pipe 10 is one or two sizes larger than the pipe diameter of the drainage branch pipes 11a, 11b, 11c,. Therefore, the pressure loss in the drainage main pipe 10 is small with respect to the polishing air amount of the drainage branch pipes 11a, 11b, 11c,..., And the suction capacity of the suction device 17 is about minus 20 KPa. Compared to the case, the ability of the suction device 17 to be used can be greatly reduced.
[0021]
As a result, at similar connection points 12b, 12c, 12d,... Other than the connection point 12a between the drainage branch pipe 11a and the drainage main pipe 10 in the 5th floor exclusive part, the pipe internal pressure is at or below atmospheric pressure. Compressed air is not ejected from each drainage outlet of the drainage branch pipes 11b, 11c,.
[0022]
When the other drainage branch pipes 11b, 11c,... Are polished for rehabilitation, the same procedure is performed. At that time, the deposits and abrasives peeled off from the inner surface of the drainage branch pipe are sucked into the abrasive separator 19 via the hose 20 connected to the end of the drainage main pipe 10, where they are separated from the air and collected by the dust collector 18. The air is exhausted from the suction device 17.
[0023]
As a result, the inner surface of the drainage branch pipe 11a can be satisfactorily polished to the extent necessary for subsequent coating without ejecting pressurized air from the drainage outlets of the drainage branch pipes piped to the floor exclusive portions. Further, further branch pipes (BD section and CD section) connected to the drainage branch pipe 11a can be cleaned and polished in the same manner, and other drainage branch pipes 11b, 11c,... Can be cleaned and polished in the same manner.
[0024]
The inner surfaces of the drainage branch pipes 11a, 11b, 11c,... Cleaned and polished as described above are then painted. The coating method at this time is basically the same as the polishing method described above. That is, when painting the A-D section of the drainage branch pipe 11a, the drainage branch pipe 11a is fed from the end of the drainage main pipe 10 by the suction device 17 while feeding the paint into the pipe with a pressurized air from the drainage port A. And the drainage main pipe 10 are sucked so that the pressure in the pipe at the connection point 12a becomes atmospheric pressure or lower.
[0025]
Specifically, as shown in FIG. 2, each drainage branch pipe 11b, 11c, 11d other than the opening 13 communicating with the uppermost part of the drainage main pipe 10 and the rehabilitation target connected to the drainage main pipe 10 Close the drain port of …… by appropriate means. And the coating material supply device 21 is attached to the drain outlet A of the drain section 11a of the drainage branch pipe 11a for rehabilitation, and the coating material supply device is connected to the air distributor 25 connected to the air compressor 14 via the hose 16. The other end of the connected hose 22 is inserted.
[0026]
Thereafter, the air compressor 14 is operated, and the paint is fed from the drain port A together with the pressurized air. As the paint, it is desirable to use a two-component quick-drying paint such as vinyl ester paint or epoxy paint. If the pipe diameter of the drainage branch pipe 11a is 50A and the pipe length of the AD section is 8m, when vinyl ester paint is used, about 1600g of paint is applied with pressurized air of about 7m ³ / min corresponding to an air flow rate of 50m / s. Feed to drain A.
[0027]
At that time, when the inside of the pipe is sucked with a suction force of minus 10 KPa by the suction device 17 through the hose 20 connected to the end of the drainage main pipe 10, if the pressurized air pressure from the drain A is 20 KPa, the air flow rate Is 7 m ³ / min, the pressure in the pipe at the connection point 12a is atmospheric pressure or lower. Then, the pressure in the drainage main pipe is confirmed by a pressure gauge 27 that detects the upper pressure of the drainage main pipe. Under these conditions, the paint is allowed to flow for a time determined by the pipe length, and the AD section of the drainage branch pipe 11a is painted. Thereafter, the BD section and the CD section are painted in the same manner. The actual painting time was 20 minutes per floor.
[0028]
Further, the drainage branch pipes 11b, 11c,... Piped in the exclusive part of the other floor can be painted in the same manner. In this way, since the drainage branch pipe is coated toward the drainage main pipe having a size one to two larger than the diameter of the drainage branch pipe, pressure is applied from the main pipe described in Japanese Patent Publication No. 60-21792. Compared with the case of painting while sucking with a branch pipe, the air flow rate of the drain branch pipe can be applied at an appropriate flow rate without being restricted by the pipe diameter or pipe length by adjusting the pressure.
[0029]
In addition, the inside of the drainage drainage main pipe can be set to atmospheric pressure or negative pressure by suction from the lower end of the drainage drainage main pipe so that the pressure inside the joint between the drainage branch pipe to be painted and the drainage dredge main pipe is below atmospheric pressure. Therefore, the inside of the drainage branch pipe other than the drainage branch pipe being painted is also at atmospheric pressure or negative pressure, and air does not blow out from the drain outlet. At that time, when the inside of the pipe is under a negative pressure, it is easy to close each drainage port with a lid or the like, and therefore there is no difficulty in attaching the lid.
[0030]
After all the drainage branch pipes have been coated in this way, warm air is passed through each drainage port to cure the coating film. In the case of vinyl ester paints, it has been confirmed that when a warm air of about 40 ° C. is sent, the coating film is completely cured in about 1 hour.
[0031]
According to the drainage branch rehabilitation method of the present invention described above, when the abrasive material or paint is fed into the pressurized air from the drain outlet, it is piped to the exclusive part of the other floor connected to the drainage main pipe. Since pressurized air does not blow out from the drain outlet of the drainage branch pipe, there is no need to separate the drainage branch pipe and the drainage main pipe, and rehabilitation work can be performed very easily and in a short time. it can.
[0032]
【The invention's effect】
As described above, according to the drainage branch rehabilitation method of the present invention, for example, in a multi-storey building such as a condominium, the inner surface of the drainage branch pipe of the exclusive portion of each floor connected to the drainage main pipe Polishing, painting, and rehabilitation can be performed in a short time and easily without spouting pressurized air from the drain outlets of drainage branch pipes piped to other floors. Moreover, the removal of deposits by polishing and the degree of polishing are good, and furthermore, coating can be performed very uniformly.
[Brief description of the drawings]
FIG. 1 is a structural explanatory view schematically showing a state in which a drainage branch pipe is polished by a drainage branch rehabilitation method according to an embodiment of the present invention.
FIG. 2 is a configuration explanatory view schematically showing a state in which the drainage branch pipe is coated by the drainage branch rehabilitation method in one embodiment of the present invention.
[Explanation of symbols]
A, B, C Drain outlet D of drainage branch D Joint point of drainage main pipe and drainage branch 10 Drainage main pipes 11a, 11b, 11c, ... Drainage branch pipes 12a, 12b, 12c, ... Drainage main pipe Connection point 13 and drainage branch 13 Opening 14 communicating with the uppermost part of the drainage main pipe Air compressor 15 Abrasive charging machine 16 Hose 17 Suction device 18 Dust collector 19 Abrasive separator 20 Hose 21 Paint supply 22 Hose 23 Hose 24 Hose 25 Air distributor 26 Air flow meter 27 Pressure gauge

Claims (6)

In a method of rehabilitating the drainage branch pipe that collects and drains the drainage from the drainage branch pipes piped to the exclusive part of each floor in a building of two or more floors,
Number of the feed pressurized air from the discharge port of the drain branch pipe to one rehabilitation selected from the drainage branch pipe, to the retreading to flow tube at the right velocity topped with rehabilitation material in the pressurized airflow Supplying drainage branches,
At the same time, sucking the air in the pipe from the lower end of the drainage main pipe to which the drainage branch pipe is connected,
At that time, the drainage outlet of the other drainage branch pipe, the drainage outlet of the drainage branch pipe on the other floor and the opening of the upper end of the drainage main pipe, the flow rate of the pressurized air in the drainage branch pipe to be rehabilitated, The drainage to be rehabilitated so as to have a flow rate determined in accordance with the diameter and length of the drainage branch pipe to be rehabilitated and required for rehabilitating the drainage branch pipe to be rehabilitated. A method for rehabilitating a drainage branch pipe, comprising adjusting an air flow rate of pressurized air sent from a drain outlet of the branch pipe. A hose that sends pressurized air from an air compressor that sends the pressurized air to a drain outlet of the drainage branch pipe to be rehabilitated and a drain outlet of another drainage branch pipe on the floor where the drainage branch pipe to be rehabilitated is located An air distributor for connecting and branching the pressurized air into the drain branch pipe and the other drain branch pipe between the air compressor and the hose;
When adjusting the air flow rate of the pressurized air sent from the drainage outlet of the drainage branch pipe to be rehabilitated, the air distributor is adjusted so that a part of the pressurized air flows through the other drainage branch pipes. 2. The method for rehabilitating a drainage branch pipe according to claim 1, wherein the backflow in the other drainage branch pipe is suppressed. When the air in the pipe is sucked from the lower end of the drainage main pipe to which the drainage branch pipe is connected, the pressure in the connection portion between the drainage main pipe and the drainage branch pipe to be rehabilitated is the air suction in the drainage main pipe 3. The drainage branch pipe rehabilitation method according to claim 1 or 2, wherein the suction pressure sucked from the drainage main pipe is controlled so as to become atmospheric pressure or lower. The rehabilitation material is an abrasive that polishes by removing deposits in the drainage branch pipe, and the abrasive is recovered by sucking air inside from a lower end of the drainage main pipe. Item 4. A drainage branch rehabilitation method according to any one of Items 1 to 3 . The drainage branch pipe according to any one of claims 1 to 3, wherein the rehabilitation material is a paint for painting the inside of the drainage branch pipe, and sucks air inside from the lower end of the drainage main pipe. Rehabilitation method. The building is a collective housing, one of the claims 1 to 5, characterized in that the drainage branch pipe at each floor proprietary portion connected to said drainage vertical main pipe is drainage from floor life water around facilities rehabilitation method for drainage branch pipe according to one or.

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