JPS6021792B2 - Recycling method for existing buried pipes - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method for regenerating existing buried pipes, and its purpose is to recycle existing buried pipes, such as water pipes or gas pipes, that are buried underground or inside buildings such as buildings and condominiums for a long period of time. When rust occurs on the inner wall due to use and changes in flow rate or fluid content occur, the inside of the existing buried pipe is polished and lined to regenerate it. The aim is to provide a method for regenerating existing buried pipes.

Conventionally, known methods for regenerating existing buried pipes include the so-called water bit method, in which the rust is polished with high-pressure water and then lined after drying, and the so-called air sand method, in which compressed air and abrasive material are pumped into one end of the pipe and the pipe is then lined. However, the Waterbit construction method involves inserting very high-pressure water, for example several tens of atmospheres, into existing buried pipes, which poses a danger to workers and makes wastewater treatment difficult.

Furthermore, the method required time to dry the water in the existing buried pipes after polishing.

On the other hand, there is also an air sand construction method disclosed in Japanese Patent Application No. 14256/1983, but this previously disclosed construction method was as follows.

That is, adiabatic compressed air flow is passed through the pipe and used for drying, heating, and cleaning, an abrasive material is injected from near the entrance of the pipe to polish the inner wall surface of the pipe, and then finely divided paint is injected to clean the inside of the pipe. Paint the wall.

Indeed, the previously disclosed underground pipe repair method, which is a trial construction method, does not use high-pressure water, so it does not pose any danger to workers, and there is no difficulty in wastewater treatment work.

However, in a pipeline that has a main pipe and a branch pipe, air is pumped only from the main pipe, so the air pressure pumped from the main pipe becomes uneven between the branch pipes. It is very difficult to adjust the pressure inside the pipe between the main pipe and each branch pipe, especially when lining the existing underground pipe. Failure to adjust the pressure between the main pipe and each branch pipe may result in the water pipe being blocked by the lining material. Ta.

In addition, there was a drawback in that it was not possible to know from the outside whether the coating process had been completed. This invention was made in order to overcome the drawbacks of the above-mentioned follow-up examples, and one embodiment of this invention method will be described below based on the drawings.

In this specification, a revive machine is a device that turns compressed air into a swirling flow using the rotational force of a blade, and a pressurized pipe is a construction pipe installed near the main pipe entrance or near the end of a branch pipe that conveys air under pressure. A suction pipe is a construction pipe installed near the end of a branch pipe that sucks air inside the pipe.

FIG. 1 is a process explanatory diagram of the method of this invention. Based on FIG. In the process of stopping the flowing fluid such as gas or water, 2
3 is a cutting process of cutting the upper and lower ends in the fluid flow direction of the part of the existing buried pipe that requires regeneration, and 3 is a recovery process by drying or absorbing gas (fluid) of the part of the existing buried pipe that requires regeneration. .

These steps 1, 2, and 3 are so-called steps that belong to pretreatment in the method of this invention.

4 is a step of polishing the part of the existing buried pipe that requires regeneration using an abrasive, and 5 is a lining step of coating the inner wall surface of the existing buried pipe that requires regeneration after this polishing step.

6 is a post-treatment drying step for recovering the solvent after lining and drying the lining coating film.

In Fig. 1, 7 is a suction mechanism, 8 is a lining material hopper, 9 is a revive machine, 10 is an air compressor, 1
1 indicates an abrasive material hopper. The method of the present invention, which consists of the above-mentioned general steps, will be further explained based on the drawings shown in FIG. An air compressor 10, a revive machine 9, and an abrasive material hopper 11 (if any) are installed at required positions downstream in the fluid flow direction of the existing buried pipes that require regeneration, and upstream in the fluid flow direction of the portions of the existing buried pipes that require regeneration. It is only necessary to connect the hopper 8 and perform the polishing step 4 and the lining step 5 based on FIG. 1 while maintaining negative pressure in the portion of the existing buried pipe that requires regeneration by operating the suction mechanism 7.

Hereinafter, an explanation will be given of an embodiment of the present invention method shown in FIG. 2 and subsequent figures, in which the existing buried pipe has a branch pipe 12.

In FIG. 2, reference numeral 13 indicates a main pipe of the existing buried pipe, and reference numeral 12 indicates branch pipes branching from this main pipe 13 for each floor or for each room.

14 is a pump for drawing up water, and 15 is an elevated water tank.

Therefore, in FIG. 2, the explanation of the method of the invention will be continued by assuming that the parts requiring regeneration are the main pipe 13 from point A to A3 and the common point, and the respective branch pipes 12. In this case, the existing buried pipe 12 that requires regeneration
, 13 upstream in the fluid flow direction of the part that requires regeneration is point A. First, cut this point A, and connect the air compressor 10 and air distribution header 10 to this point A, as shown in FIG. 2B.
a, the pressurizing pipe 10b and the IJ pipe machine 9 are first connected.

At this time, if there are meters near point A, remove the meters or create a bypass passage to prevent damage to the meters. Incidentally, as described above with reference to FIG. 1, before the point A cutting step, it is necessary to stop the fluid, that is, stop the gas body, and stop the water supply as pretreatment steps.

After connecting the above-mentioned pressurized air feeding mechanism to this point A, the end portions 12a, 12b of the existing buried pipe 13...
...121 has suction pipe 10c, air distribution header 10
It is coupled to the suction mechanism 7 via d. Fluid (water or gas) is sucked toward the suction mechanism 7 side, and in this step, the inside of the existing buried pipes 12, 13 is dried or the fluid is recovered. Next, the abrasive hopper 1 is installed at the joint part of the revive machine 9 at a required position A upstream in the fluid flow direction of the existing buried pipes 12 and 13 that require regeneration.
Connect 1.

In FIG. 2, all the ends of the branch pipe 12 in the fluid flow direction are 12a, 12b, 12c, 12d, 12e, 12
f, 12g, 12h, 12i, 12j, 12k, 121
, refers to all of .

In addition, FIG. 3 shows the revive machine 9, air distribution header 10a,
10d, air compressor 10, suction mechanism 7, main pipe 13, branch pipe 12, pressurizing pipe 10b, suction pipe 1
0c is schematically illustrated.

In FIG. 3, the location A to which the abrasive hopper 11 is connected, ie, the mounting portion, is the location A.

Incidentally, as shown in FIG. 3, in water pipes and the like, a faucet 16 is attached to the end of the branch pipe 12, so this faucet 16 must be removed during work. The abrasive hopper 11 is connected to the reviving machine 9 in the mounting section A, as shown in FIG. 3 or FIG. Incidentally, in this invention, as the suction mechanism 7, a suction mechanism as described later in FIG. 5 can be preferably used, and as the air compressor 10, a known air compressor 10 as shown in FIG. As the distribution headers 10a, 10d, any known air distribution header 10a, 10d that separates compressed air from the so-called air compressor 10 can be preferably used.

In addition, as the reviving machine 9 in the present invention, any device can be preferably used as long as it is a device that converts compressed air flow into a swirling flow 9b by the rotational force of a blade 9a, as shown in a cross-sectional view in FIG. Next, the suction mechanism 7 that can be suitably used in the present invention will be explained based on FIGS. 5 and 6.

As shown in FIGS. 5 and 6, the suction mechanism 7 that can be suitably used in the method of the present invention includes a suction device 71 such as a roots floor, and a wet type suction device 71 located upstream of the suction device 71 in the air flow direction A, that is, in the suction path. Any device having a dust collection tank 72, a dust collection device 73 if required, and a mist catcher 74 downstream in the air flow direction A, that is, in the discharge path, can be preferably used as long as it can be mounted or placed on the vehicle copper 75. Existing buried pipes 12, 13 that require regeneration such as the suction mechanism 7
After connecting the existing buried pipes 12 and 13 that need to be regenerated, as shown in FIGS. On the other hand, the air compressor 10, the air distribution pipes 10a and 10d, and the revive machine 9 are installed at the upstream end in the fluid flow direction A, and the abrasive hopper 11 is installed near the saddle joint with the revive machine 9. Installing. Note that the pressurized air flow from the air distribution header 10a is as shown in FIG.
Path 11a connected to revive machine 9, abrasive material hopper 1
A path 11b that connects to the upper side of the fluid flow direction A and a path 11c that connects the fluid to the upstream side 19 in the fluid flow direction A near the mounting portion A are provided as necessary. After doing this, as shown in FIG. 7, deposits 12a such as rust generated on the inner wall of the existing buried pipe 12 are polished.

In the polishing method, compressed air from the air compressor 10 is fed into the revive machine 9 via the air distribution header 10a, and at the same time it is pressurized from the top of the abrasive material hopper 11, so that the abrasive material 17 is transferred to the existing arrangement due to the Venturi effect. It is fed into the existing pipe 12 from the upstream part A of the installed pipe 13 while being sucked.

At this time, compressed air is further inserted from the air distribution header 11 through the path 11c from a point 19 near the attachment part A, so that the flow of the abrasive material 17 is accelerated and the suction mechanism 7 is operated to move the compressed air into the existing piping. Since the abrasive material 17 is in a negative pressure state, the passage of the abrasive material 17 into the existing piping, particularly into the branch pipe 12, is further facilitated. Incidentally, the abrasive material 17 is conveyed to the swirling flow 9b through the revive machine 9, and is transported inside the pipe 12,
13, rust etc. on the inner walls of the existing pipes 13 and 12 will be reliably and steadily polished.

If this abrasive material 17 is applied to the most distal end of the branch pipe 12, e.g. 12a or 12f or 12g, or any one of them, then the abrasive material 17 is applied to the distal end of the branch pipe 12, e.g. 12a or 12f or 12g.
Remove the suction pipe 10c that passes through a, and replace it with the pressure pipe 10b.

The reason for this is to facilitate polishing work inside the other branch pipes 12. This operation is repeated until all the ends are connected to the pressure pipe 1ob.

In addition, in this polishing step 4, L is
If there is a mold part L, the abrasive material 17a may damage the bent part and cause it to break. Insert the buffer deformed tube Lb into the side.

Since this buffer deformed tube Lb is removed after the polishing step 4 is completed, there is no problem even if it is damaged.

(See Figure 7B) The above method also applies to the main pipes 13 of A to A6, and the main pipes 13 of A, A2, N, A4, A.
5. Branch pipes 12, 12a branching from A6...
I explained how to process up to 121 at once,
A~, A~13 main pipes of A6 and A, ~12c, 12d
, A2~12b, 12e, Hmm~12a, 12f, A4~
12i, 12j, hmm~12h, 12k, A6~12g,
121, may be processed separately.

In this case, the insertion points of the abrasive material hopper 11 etc. are A, A, .
These are the upstream points in the fluid flow direction of A2, A5, and A5, respectively. After this polishing step is completed, as shown in FIGS. 9 and 10, a lining material hopper 8 is attached to the end of the existing piping 13 near the mounting portion A.

Of course, when installing, the abrasive material hopper 11 installed in advance is removed. In addition, as in the polishing process, a suction mechanism 7, an air compressor 10, a revive machine 9,
The air distribution header 10a is pre-installed.

As in the polishing step 4 described above, compressed air is sent from the air compressor 10 to the revive machine 9 through the air distribution header 10a, and as another system, the lining material hopper is sent to the lining material hopper 11b.
Compressed air is sent to 8 and accelerated compressed air 11c is sent from a position 19 near the installation upstream in the fluid flow direction A, and at the same time, the suction mechanism 7 brings the inside of the existing buried pipe system which requires treatment into a negative pressure state.

By doing so, the lining material 20 is conveyed from the lining material hopper 8 by the swirling flow 9b and coats the inner walls of the existing pipes 13 and 12.

The lining material hopper 8 is configured to mix the lining material and the lining material curing liquid during lining so that the lining material and the lining material curing liquid can be mixed and applied. As the lining material 20, all commonly known materials can be preferably used, and for example, lining materials such as epoxy resin can be suitably used.

This lining process 5 is performed on the branch pipe 1 as shown in FIG.
For example, 12a, 12
f, 12b, 12e, 12C, 12d in sequence, then 12g, 121, 12h, 12k, 12i, 12h
As shown in Figure 2, the lining material 20 is poured from point A and the branch pipes 12 are sequentially lined, or the lining material 20 is poured from point A to point A to A3 and from point A to A6 as shown in Fig. 2. While lining with A
, pour the lining material 20 from the points 12c, 12d
12b, 12e from point A2...12g, 121 from point A6 may be coated separately.
The method of this invention is characterized in that the amount of lining material 20 to be poured from point A to the end portion 12a, for example, is set in advance, and only the required amount is applied.

That is, there is an effect that clogging of the existing buried pipe 13 or 12, especially the branch pipe 12, caused by the lining material 20' can be prevented by applying only the necessary amount.

Explaining based on the schematic diagram of FIG. 10, the amount of lining material 20 poured from the lining material hopper 8 is determined by specifying the total length 1 of the main pipe 13 and/or branch pipe 12 that must be coated with this one lining material 20. It is sufficient to set the amount necessary to coat the entire inner wall of the path, and therefore, the amount is determined by taking into account the pipe length d and the pipe length 1.

In addition, in FIG. 10, 21 is a lined coating.

In order to line the inner walls of the existing pipes 12 and 13 that require regeneration in this way, if a specific route is first performed, for example from A to 12a, then all the pressurized pipes 10b are connected to the other end portions 12b...12b, Set so that only a specific path has negative pressure.

The reason for this is to shorten the lining processing time and to accelerate the movement speed of the lining material 20 in the pipe so as to eliminate variations in coating thickness. In addition, a transparent tube 21a is connected to the most distal end of the specific path, for example 12a, and the time when the lining material 21 has been transferred to the transparent tube 21a is defined as the end of the lining step 5.

When the lining process for this specific route is completed, the suction pipe 10c of this specific route is replaced with the pressurizing pipe 10b,
The suction pipe 10c is placed at the end of the other route, for example 12b, and the above operation is temporarily restored in the same manner to complete the lining process for the entire route. This work can be done even when there are few branch pipes 12 as shown in Fig. 2, from point A to each end 12a...121, or from point A to point A3, from point A to point A6 as described above. Main pipe 13 and A, 12c, 12d and A from the point
, 12b, 121, etc., even if the branch pipes 13 are treated separately, only the path that requires treatment is placed under negative pressure, and the others are placed under pressure. Finally, the reviver 9, the air distribution headers 10a, 10d, the air compressor 10, and the suction mechanism 7 are removed to restore the cut portion A, and before this restoration, the interior of the existing pipes 12 and 13 is dried.

As detailed above, the method for regenerating existing buried pipes according to the present invention simultaneously provides the following excellent effects.

■ Since the pipe is regenerated by suctioning and pressurizing the air inside the pipe without using high-pressure water, there is no danger in the work or difficulty in wastewater treatment associated with the conventional water bit method. ■ Air inside the pipe is sucked from the branch pipe to be coated, and compressed air is fed under pressure from other branch pipes, making it easy to control the pressure inside the existing pipe, so there is no clogging of the existing pipe by the lining material.

■ Since the air inside the pipe is sucked through the branch pipe, negative pressure is generated inside the pipe, which makes it easier for water and lining material to dry, thereby shortening the construction time. ■ Since the air inside the tube is absorbed through the skin tube, the capacity of the air compressor, etc. on the pressurizing side can be reduced by 4 cm compared to conventional methods. ■ Since the air inside the pipe is absorbed from all branch pipes after the pipe is dried, dangerous gases within the existing piping system can be reliably inhaled even in existing piping where explosive gas remains, such as gas pipes.

■ A transparent tube is installed at the end of the branch pipe that is the target of coating during coating, so it is easy to visually check from the outside whether coating has been completed within the existing pipe. ■ In addition, all existing piping can be regenerated by simply cutting the required parts of the existing piping.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the process of regenerating existing buried pipes according to the method of this invention, Fig. 2 A, B, and C are explanatory diagrams of piping according to an embodiment of the method of this invention, and Fig. 3 is an explanatory diagram of the process of regenerating existing buried pipes according to the method of this invention. Figure 4 is an explanatory diagram of a lube machine used in this invention method, and Figures 5 and 6 are a suction mechanism used in an embodiment of this invention method. 7A, B and 8 are explanatory diagrams of the polishing process used in an embodiment of the method of this invention, and FIGS. 9 and 10 are linings used in an embodiment of the method of the invention. It is an explanatory diagram of a process. 7... Suction mechanism, 8... Lining material hopper, 9
... Revive machine, 10 ... Air compressor, 10a
, 10d... Air distribution header, 12...
... Branch pipe, 13... Existing pipe. Figure 1 Figure 4 Figure 2 Figure 10 Figure 3 Figure 5 Figure 8 Figure 6 Figure 7 Figure 9

Claims (1)

[Claims] 1. In an existing buried pipe having at least a main pipe and a branch pipe, a stream of compressed air is used for drying, polishing, coating, and drying inside the pipe, and an abrasive is ejected into the air stream near the entrance of the main pipe. In the method of regenerating existing buried pipes for polishing, after the inside of the pipe is dried, the air inside the pipe is sucked from the ends of all branch pipes, and the abrasive material is conveyed and distributed from the main pipe inlet using a swirling flow of compressed air, and the inner wall of the pipe is polished one by one. Compressed air is also sent from the end of the polished branch pipe to polish all the inner walls of the pipes, and then a transparent pipe is installed at the end of one branch pipe, and the air inside the pipe is sucked from the end of the transparent pipe, and air is sucked from the end of the other branch pipe. While compressed air is being pumped, the lining material is conveyed from the inlet of the main pipe to the transparent pipe by a swirling flow of compressed air, and is coated from the main pipe to the end of one branch pipe, and then the other branch pipes are sequentially coated in the same manner. Features: Recycling method for existing buried pipes.