JP2000204611A - Method for removing existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily remove an existing pipe by reducing labor of an operator by precluding the possibility of scattering asbestos at removing work, by crushing the pipe by injecting a high pressure liquid from a liquid injection tool inserted into the existing pipe, and recovering a crushed piece from under the pipe together with liquid. SOLUTION: While adding and connecting a hollow shaft 5, the hollow shaft is inserted until a liquid injection tool 7 installed on the tip reaches the lower end of an existing asbestos pipe. Liquid is supplied from a high pressure hose 17 connected to the upper end of the shaft 5, the existing asbestos pipe is crushed from the inside by high pressure water injected from a sideways turning injection nozzle of the liquid injection tool 7, and at the same time, a crushed piece is dropped in downward by the high pressure water injected downward from a downward injection nozzle. Since the crushed piece sucked together with the high pressure water precipitates in a precipitating chamber in a precipitating tank 27, water is reused as the high pressure water. According to this method, asbestos does not scatter at crushing time and recovering time, and since there is no need to seal a work place, a labor burden of an operator can be sharply reduced so that the working efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing an existing pipe installed in a building such as a condominium, a building, etc., and more particularly, to an exhaust pipe for a bathtub installed in a bathroom of an apartment. It is suitable for removing asbestos pipes (asbestos pipes) from the bathroom to the roof.

[0002]

[Prior Art] Among apartment houses such as housing complexes and condominiums,
In relatively old buildings, asbestos pipes are used for exhaust pipes and air supply pipes in bathrooms. For example, an asbestos pipe for exhaust is provided from a bathtub in a bathroom to a rooftop. Asbestos pipes for air supply and exhaust are piped by the number of bathrooms, and are buried in concrete walls of the building and piped.

[0003] When a building in which an asbestos pipe is buried in a wall is dismantled, asbestos, which has been pointed out as a carcinogen, is scattered in the air. Therefore, it is necessary to remove the asbestos pipe before dismantling the building. Conventionally, when removing the asbestos pipe for the exhaust from the bathroom, it is performed as follows.

(1) The bathroom is isolated from the outside by surrounding it with a vinyl sheet or the like. (2) Cover the air supply port and drain port communicating with the outside of the bathroom with mortar or the like. (3) An operator wearing a dust mask and dust proof clothes uses a small crusher (pick or the like) to crush not only the concrete wall of the building but also the internal asbestos pipe. At this time, in order to suppress the scattering of asbestos, the work is performed while spraying a liquid (for example, water) for suppressing scattering to the crushed portion. (4) The crushed lump is manually housed in a collection bag or the like, and the liquid for suppressing scattering accumulated on the floor is also collected. (5) The storage bag containing the crushed lump is manually carried out of the building, mounted on a truck or the like, transported to a final disposal site, and disposed.

[0005]

The above-mentioned conventional removing method has the following problems. (1) Since it takes time and effort to isolate the work place from the outside by surrounding it with a vinyl sheet or the like, the construction period is lengthened and the cost is increased. (2) Since the work place surrounded by the vinyl sheet is hot and humid, the physical burden on the worker who works in the work place is large.
The burden is extremely heavy especially in summer. (3) Even if a dust mask is worn, there is a possibility that the suction of asbestos cannot be completely prevented, and there is a problem in the health of workers. (4) The work is troublesome because a small crusher crushes the liquid while spraying the crushing part. (5) In order to remove the asbestos pipe inside, the surrounding concrete wall must also be crushed, so it takes time to remove the asbestos pipe. (6) The crushed concrete mass is so large that it may not be able to be transported outside as it is. In that case, it is troublesome because it is necessary to crush the concrete mass small or to remove only the asbestos pieces from the concrete mass. (7) Since the crushed lump is manually stored in a storage bag or the like, the work efficiency is poor, and the labor burden on the worker is large. (8) The crushed asbestos pipe may be scattered in the air as it is, so it is obliged to dispose of it at a final disposal site of a shut-off type. However, the number of final disposal sites that can be cut off is limited in the whole country, and transportation and disposal costs to such disposal sites are high. (9) Along with the various problems described above, the entire removal operation becomes costly.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and there is no danger of asbestos being scattered at the time of removal work, so that there is no need to partition the work place and isolate it from the outside. , Easy to work, good work efficiency,
Removal of existing pipes, which reduce the labor burden on workers, have no health problems such as workers inhaling asbestos having carcinogenicity, and facilitate the collection and disposal of crushed asbestos pipes, which are inexpensive. It is to provide a method. This removal method is as follows.

In the first method of removing an existing pipe of the present application, a liquid ejecting tool is inserted into the existing pipe, high-pressure liquid is ejected from the liquid ejecting tool to the pipe to crush the pipe, and the crushed pieces are removed. It is collected from below the pipe together with the liquid.

In the second method for removing an existing pipe of the present application, a liquid ejecting tool is inserted into the existing pipe, high-pressure liquid is ejected from the liquid ejecting tool to the pipe, and the pipe is crushed to remove the liquid ejecting tool. Move the pipe upward from below to crush the pipe from below upwards, or move the liquid ejector downward from above to crush the pipe from top to bottom,
The crushed pieces are collected together with the liquid from below the pipe.

A third method of removing an existing pipe of the present application is to insert a cutter into the existing pipe, crush the existing pipe from the inside with the cutter, and collect crushed pieces from below the pipe.

A fourth method of removing an existing pipe according to the present application is to insert a cutter into the existing pipe, and crush the pipe from the inside with the cutter while spraying or spraying a liquid from the inside to the pipe. Together with the liquid from below the pipe.

A fifth method of removing an existing pipe of the present application is to move a cutter inserted into the existing pipe from above to below the existing pipe to crush the pipe from above to below, or to move the cutter from below. The pipe is moved upward to crush the pipe from below to above.

A sixth method of removing an existing pipe of the present application is to drop crushed pieces below the pipe with a liquid, and collect the falling liquid together with the crushed pieces from below the pipe.

[0013] A seventh method of removing an existing pipe of the present application is to collect crushed pieces and liquid in the existing pipe from below the pipe and separate the crushed pieces from the crushed piece, and jet or separate the separated liquid into the existing pipe. It is reused as a liquid for spraying or falling.

The eighth method of removing an existing pipe of the present application is to put the collected crushed pieces and liquid into a sedimentation tank to separate the crushed pieces and liquid.

In the ninth method for removing an existing pipe of the present application, a sedimentation promoting material is mixed into a sedimentation tank to promote sedimentation of crushed pieces.

The tenth method for removing an existing pipe of the present application is to mix a collected crushed piece with a coagulant to solidify it and then carry it out.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIGS. 1 to 5 show a first embodiment which is an example of a method for removing an existing pipe according to the present invention.
It will be described based on. This removal method is an example of removing an existing pipe (asbestos pipe) 3 that is piped from a bathroom on each floor to a roof of a building (the one shown in FIG. 5 is a five-story apartment building) as shown in FIG. is there. In this removing method, the asbestos pipe 3 is crushed from the inside by a water jet type high pressure liquid. For this purpose, the liquid ejector 7 of the water jet type crusher 1 is inserted into the existing pipe 3 (FIG. 1), and high-pressure liquid is ejected from the liquid ejector 7 to the existing pipe 3 to crush the pipe 3. This is a method in which crushed pieces are collected from the lower end of the existing pipe 3 together with the injected liquid, the collected crushed pieces and liquid are separated by the sedimentation tank 27 (FIG. 3), and the separated liquid is reused.

As shown in FIG. 1, the crushing machine 1 has a liquid ejecting device 7 attached to the lower end of a hollow shaft 5 so that the driving device 9 can rotate the shaft 5 in the circumferential direction of the asbestos pipe 3 and the asbestos pipe 3 3 can be moved up and down in the axial direction. A desired number of additional shafts 5 can be added to the upper end of the shaft 5 according to the length of the existing asbestos pipe 3. Specifically, of the two shafts 5 to be connected, a male screw formed on one outer circumferential surface of one longitudinal end of one shaft 5 and a female screw formed on an inner circumferential surface of one longitudinal end of another shaft 5. The two shafts 5 are connected to each other by screwing the screws. The liquid ejecting device 7 has a cylindrical shape slightly larger in diameter than the shaft 5 as shown in FIG. 2, and has a lateral jet nozzle (bit nozzle) 11 at two places on its outer peripheral surface.
Are provided diagonally downward on the sides, and one downward jet nozzle (bit nozzle) 12 is protruded from the bottom surface.

The driving device 9 includes an electric motor operated by a power supply from a commercial power supply or a generator, a rotating mechanism rotated by the operation, and an elevating mechanism. The shaft 5 is installed by driving the rotating mechanism. The asbestos pipe 3 can be rotated at a predetermined speed in the circumferential direction, and the shaft 5 can be moved up and down continuously or intermittently at a predetermined speed in the axial direction of the existing asbestos pipe 3 by driving a lifting mechanism. is there. The rotating mechanism and the elevating mechanism may be driven by different motors.

The sedimentation tank 27 shown in FIG. 3 separates the crushed pieces collected together with the liquid from the liquid by sedimentation filtration and separates the liquid from the liquid. The inside of a rectangular parallelepiped tank 29 is partitioned by two partition plates 31 having different heights. The inside of the tank 29 is divided into three sedimentation chambers 33 whose volume gradually decreases from the left side to the right side in FIG.

In order to remove the asbestos pipe 3 buried in the concrete wall 23 of the building using the above-mentioned equipment, the following method is used (this removal method is one of the removal methods of the present invention). . (1) A TV camera (for example, C
A CD camera) is inserted, and the internal state of the asbestos pipe 3 is checked. The seam of the asbestos pipe 3 is shifted,
If the reinforcing bars protrude into the existing asbestos pipe 3, remove them in advance. (2) The crusher 1 is moved vertically and / or horizontally so that the center axis of the shaft 5 of the crusher 1 and the center axis of the existing asbestos pipe 3 coincide with each other. (3) As shown in FIG. 1, the shaft 5 to which the liquid ejecting device 7 is attached is supported by a tower 15 assembled on the roof of a building and inserted into the existing asbestos pipe 3.
To the lower end of the existing asbestos pipe 3. At this time, the necessary number of shafts 5 are added until the liquid ejecting device 7 reaches the lower end of the existing asbestos pipe 3. (4) A high-pressure hose 17 is connected to the upper end of the shaft 5, and a liquid (for example, water) pumped by a high-pressure pump 21 (FIG. 4) from a water supply tank 19 (FIG. 4) is supplied to the high-pressure hose 17 at a high pressure. Is jetted from the two lateral jet nozzles 11 of the liquid jetting tool 7 toward the inner peripheral surface of the existing asbestos pipe 3 to crush the existing asbestos pipe 3 from the inside. At this time, the shaft 5 is continuously or intermittently rotated in the circumferential direction of the existing asbestos pipe 3 to inject high-pressure water onto the entire peripheral face of the existing asbestos pipe 3 to crush the entire peripheral face. Further, the shaft 5 is continuously or intermittently pulled up to raise the liquid ejecting tool 7.
And crush the existing asbestos pipe 3 sequentially from the lower end to the upper end. At this time, the concrete wall 23 in which the existing asbestos pipe 3 is embedded may be crushed at the same time. When a plurality of pulled-up shafts 5 are extended, the shafts 5 are lifted and become unnecessary.
And remove them one by one. (5) As described above, at the same time as the existing asbestos pipe 3 is crushed from the inside thereof, the high-pressure water supplied to the high-pressure hose 17 is jetted downward from the downward jet nozzle 12 of the liquid jetting tool 7 to thereby crush the existing asbestos pipe 3. Asbestos pipe 3 and surrounding concrete wall 2 crushed simultaneously with existing asbestos pipe 3
3 (hereinafter collectively referred to as “crushed pieces”) is dropped (poured) downward. (6) The crushed pieces are sucked together with the high-pressure water jetted from the jet nozzles 11 and 12 by a vacuum wheel 25 (FIG. 4) through a hose 24 (preferably a flexible hose), and are collected in a sedimentation tank 27 (FIG. 3). Put into the sedimentation chamber 33 at the left end. (7) Most of the crushed pieces in the sedimentation chamber 33 settle and accumulate on the bottom thereof, and the crushed pieces and water remaining without being settled over the partition plate 31 (overflow) to form a central settling chamber 33 in the center. Move on to Also in this sedimentation chamber 33, some crushed pieces settle and accumulate on the bottom, and the remaining crushed pieces and water overflow and move to the rightmost settling chamber 33. In this sedimentation chamber 33 as well, crushed pieces precipitate and accumulate on the bottom, and the upper layer is made up of only water containing almost no crushed pieces. (8) The filtered water in the upper layer of the sedimentation chamber 33 at the right end is supplied to the high pressure pump 2
The water is pumped up by 1 and returned to the high-pressure hose 17 for reuse as water jetted from the jet nozzles 11 and 12. (9) When the existing asbestos pipe 3 has been crushed by the above operation, a CCD camera is inserted into the crushing mark (removal mark) to check the internal condition. When the existing asbestos pipe 3 remains, the above operation is performed again, and the remaining existing asbestos pipe 3 is completely removed.

In order to collect the crushed pieces together with the water, a tapered nozzle 35 is attached to the tip of the hose 24 connected to the lower end of the existing asbestos pipe 3 as shown in FIG. In addition, it is desirable to make it easy to make the gap between the existing asbestos pipe 3 and the hose 24.

In the case where crushed pieces are precipitated in the sedimentation tank 27 and the liquid is filtered, if a sedimentation promoting material (for example, volcanic ash) is mixed in the sedimentation tank 27, the sedimentation speed of the crushed pieces and the filtration efficiency are improved. It is desirable to do.

In this embodiment, the rotation speed of the liquid ejecting device 7 is set to 180 times / min, the rising speed is set to 30 cm / min, and the injection water amount is set to 12 to 14 liters / min. In this case, the existing asbestos pipe 3 has 20 per square centimeter.
A pressure of 00 kg is applied, and the existing asbestos pipe 3 is crushed into a powder. These numerical values are merely examples, and the rotational speed and other numerical values are not limited to those described above. However, when the injection pressure is reduced while keeping the rotation speed of the liquid ejecting device 7 the same as above, it is desirable from the viewpoint of reducing the rising speed to about 15 cm / min from the viewpoint of obtaining the same crushing effect. Further, the liquid ejecting device 7 can be moved from the upper end to the lower end of the existing asbestos pipe 3, and even in such a case, the same crushing effect as described above can be obtained.

(Embodiment 2) The crusher 1 used in the method for removing an existing pipe of the present invention is not limited to the water jet type, but may be a cutting type. As shown in FIG. 6, the cutting-type crusher 1 has a cutter 42 attached to the tip of a rotating shaft 40 so that the rotating shaft 40 can be rotated in the circumferential direction of the existing asbestos pipe 3 by a driving device. It can be moved up and down in the axial direction. Various cutters such as a diamond cutter and a superalloy cutter can be used as the cutter 42, but in the embodiment shown in FIG.
A superalloy or diamond blade 47 is attached to the surface of the pipe, and the blade 47 rotates while contacting the inner peripheral surface of the existing asbestos pipe 3 so that the existing asbestos pipe 3 is cut from the inside. It is crushed.
The cutter 42 is not limited to the structure shown in FIG. 6, but may be any other structure as long as the cutter 42 is capable of rotating in contact with the inner peripheral surface of the existing asbestos pipe 3 and cutting and crushing the existing asbestos pipe 3 from the inside. You can also. The rotating shaft 40 may be flexible. When it is used, the bent existing asbestos pipe 3 can be crushed. The same drive unit as the drive unit of the water jet crusher 1 can be used.

When the existing asbestos pipe 3 buried in the concrete wall 23 of a building is to be removed by using the cutting type crusher 1, the following method is used (this removing method is the removing method of the present invention). Is another example). (1) A TV camera (for example, C
A CD camera) is inserted, and the internal state of the asbestos pipe 3 is checked. When the cutting type crusher 1 is used, the seam of the asbestos pipe 3 is shifted or the existing asbestos pipe 3
Even if the reinforcing bars protrude inside, it is not necessary to remove them in advance, but they may be removed. (2) The crusher 1 is moved vertically and / or horizontally so that the center axis of the shaft 5 of the crusher 1 and the center axis of the existing asbestos pipe 3 coincide with each other. (3) The tower 15 in which the cutter 42 is assembled on the roof of a building
The asbestos pipe 3 is inserted into the existing asbestos pipe 3, the cutter 42 rotated by the driving device is brought into contact with the inner surface of the existing asbestos pipe 3, and the asbestos pipe 3 is cut and crushed. In this case, in order to prevent the asbestos pipe 3 to be crushed from scattering, it is desirable to spray a liquid (for example, water) from the inside of the asbestos pipe 3 onto the asbestos pipe 3 or to cut and crush it while spraying. . At this time, the concrete wall 23 in which the existing asbestos pipe 3 is buried
May also be crushed at the same time. In order to spray water, for example, a high-pressure hose 17 is connected to the upper end of the rotary shaft 40, and water pumped from a water supply tank 19 (FIG. 4) by a high-pressure pump 21 (FIG. 4) is supplied to the high-pressure hose 17. The water is sprayed toward the inside of the existing asbestos pipe 3 from a spray port provided in the rotary shaft 40 and the cutter 42. In this case, before spraying water on the inner peripheral surface of the asbestos pipe 3 before crushing the existing asbestos pipe 3, the injection port is provided below the cutter 42, and when spraying water while crushing, the injection port is provided above the cutter 42. It is desirable to provide an injection port at the bottom. In addition, asbestos pipe 3
It is desirable that the crushing of the steel be advanced sequentially from the upper end to the lower end. At this time, if the number of the shafts 5 becomes insufficient, another necessary number of the shafts 5 are added. (4) As described above, at the same time as the existing asbestos pipe 3 is crushed from the inside thereof, the water supplied to the high-pressure hose 17 is directed downward from the injection port or the injection port provided separately from the existing asbestos pipe 3. Then, the crushed existing asbestos pipe 3 and the surrounding concrete wall 23 (hereinafter collectively referred to as “crushed pieces”) which are crushed simultaneously with the existing asbestos pipe 3 are dropped (poured) downward. (5) The crushed pieces are sucked together with the water in the existing asbestos pipe 3 by a vacuum truck 25 (FIG. 4) through a hose 24 (preferably a flexible hose), and settled in a sedimentation tank 27.
(See FIG. 3). (6) Most of the crushed pieces in the sedimentation chamber 33 are settled and deposited on the bottom thereof, and the crushed pieces and water remaining without being settled over the partition plate 31 (overflow) so as to be in the center of the settling chamber 33. Move on to Also in this sedimentation chamber 33, some crushed pieces settle and accumulate on the bottom, and the remaining crushed pieces and water overflow and move to the rightmost settling chamber 33. In this sedimentation chamber 33 as well, crushed pieces precipitate and accumulate on the bottom, and the upper layer is made up of only water containing almost no crushed pieces. (7) The filtered water in the upper layer of the sedimentation chamber 33 at the right end is supplied to the high pressure pump 2
The water is pumped up by 1 and returned to the high-pressure hose 17 to be reused as water to be injected into the existing asbestos pipe 3 or water for falling. (8) When the existing asbestos pipe 3 has been crushed by the above operation, a CCD camera is inserted into the crushing mark (removal mark) to check the internal condition. When the existing asbestos pipe 3 remains, the above operation is performed again, and the remaining existing asbestos pipe 3 is completely removed.

The water sprayed on the inner peripheral surface of the existing asbestos pipe or the water for dropping may be normal pressure instead of high pressure. In addition, the cutter 42 can be moved from the lower end to the upper end of the existing asbestos pipe 3, and the same crushing effect as described above can be obtained with such movement.

(Embodiment 3) In the removal method using a cutter, the scattering control liquid (for example, water) is applied to the existing asbestos pipe 3.
Without spraying, the existing asbestos pipe 3 can be cut and crushed by the cutter 42. In this case, the upper end and / or lower end of the existing asbestos pipe 3 is made of rubber, resin or the like,
It is desirable that the asbestos is blocked by a thin plate, a film, or the like to prevent the asbestos from scattering to the outside of the existing asbestos pipe 3. This lid does not hinder rotation and elevation of the rotary shaft 40. Also in this case, high-pressure water or normal-pressure water is poured into the existing asbestos pipe 3 during or after the cutting and crushing, and the crushed pieces are dropped (poured), and the crushed pieces and water are collected and settled. Precipitate in the layers, filter and recycle.

In the first to third embodiments, the case where the asbestos pipe 3 buried in the concrete wall 23 of the building is crushed and removed has been described. It can be used not only for removing pipes but also for crushing and removing various pipes not buried in concrete walls.

[0030]

According to the first method for removing an existing pipe of the present invention, the existing pipe is crushed from the inside by the high-pressure liquid, and the following effects are obtained. (1) The labor and time for crushing the concrete wall around the existing pipe can be saved. (2) Since there is no possibility that crushed pieces and powder are scattered in the air, it is not necessary to enclose the work place with a sheet or the like and to isolate it from the outside, so that labor for enclosing is not required. (3) It is not necessary to perform the crushing operation while spraying the scattering control liquid. (4) Since there is no need for the worker to perform crushing work in a closed work place, the working environment is remarkably improved, the labor burden on the worker is significantly reduced, and the health caused by asbestos suction is reduced. The problem is solved. (5) Since the crushed pieces are collected together with the jetted liquid, there is no danger of asbestos being scattered during the collection as well as during the crushing.

According to the second method for removing an existing pipe of the present application, the liquid ejector is moved from below to above or from above to break the pipe, so that the existing pipe can be evenly crushed. Yes, no crushing residue. When the crushed pieces are further moved upward from below, the crushed pieces sequentially fall downward (in a direction opposite to the moving direction of the liquid ejecting tool), so that the movement of the liquid ejecting tool is not hindered by the crushed pieces.

The third existing pipe removing method of the present application has the following effects because the existing pipe is crushed from the inside by the cutter. (1) Since the noise is very low, it is particularly suitable for removing existing pipes in a densely populated area or when a building is renovated while being occupied by people. (2) Even if there is a reinforcing bar in the existing pipe or the joint of the existing pipe is displaced, it is possible to crush without removing the rebar or correcting the displacement. (3) If the shaft is flexible, the existing pipe that is bent can be crushed.

The fourth method of removing an existing pipe of the present application has the following effects because the existing pipe is crushed from the inside by a cutter while spraying or spraying a liquid on the inner peripheral surface of the pipe. (1) The labor and time for crushing the concrete wall around the existing pipe can be saved. (2) Since there is no possibility that crushed pieces and powder are scattered in the air, it is not necessary to enclose the work place with a sheet or the like and to isolate it from the outside, so that labor for enclosing is not required. (3) It is not necessary to perform the crushing operation while spraying the scattering control liquid. (4) Since there is no need for the worker to perform crushing work in a closed work place, the working environment is remarkably improved, the labor burden on the worker is significantly reduced, and the health caused by asbestos suction is reduced. The problem is solved. (5) Since the crushed pieces are collected together with the jetted liquid, there is no danger of asbestos being scattered during the collection as well as during the crushing.

In the fifth method of removing an existing pipe of the present application, the pipe is crushed by moving the cutter from below to above or from above to below the existing pipe, so that the existing pipe can be crushed uniformly. There is no crushing residue.

According to the sixth method for removing an existing pipe of the present application, the crushed pieces are dropped below the pipe by the liquid, so that the crushed pieces are clogged in the pipe, and the movement of the liquid ejecting tool and the cutter is hindered. There is no.

According to the seventh method for removing an existing pipe of the present application, the liquid in the existing asbestos pipe is reused as a liquid to be sprayed for crushing, a liquid to be sprayed to prevent asbestos from being scattered, or a liquid for falling. The consumption of these liquids is reduced and costs are reduced.

According to the eighth method of removing an existing pipe of the present application, the collected crushed pieces and liquid are put into a sedimentation tank and separated into crushed pieces and liquid. Is not mixed. Therefore, the injection nozzle of the crusher is not clogged by the crushed pieces, and the hose is not clogged, thereby causing no failure or malfunction.

According to the ninth method for removing an existing pipe of the present application, a sedimentation accelerating material is mixed into a sedimentation tank to promote the sedimentation of crushed pieces, so that the crushed pieces can be separated from the liquid quickly, and work efficiency can be improved. Is improved.

In the tenth method for removing an existing pipe of the present application, the recovered crushed pieces are mixed with a coagulant and solidified before being transported. Therefore, there is no possibility that asbestos may be scattered during the removal. Further, if asbestos is coagulated so as not to be scattered, it is not treated as asbestos when discarded at a disposal site, so that it is not necessary to discard it at a final disposal site of a cut-off type, and the disposal cost is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a crusher used in a method for removing an existing pipe of the present invention.

FIG. 2 is an enlarged explanatory view showing a liquid ejector of the crusher.

FIG. 3 is an explanatory view showing an example of a sedimentation tank used in the method for removing an existing pipe according to the present invention.

FIG. 4 is a schematic view showing an example of an embodiment of a method for removing an existing pipe according to the present invention.

FIG. 5 is an explanatory view showing an example of a pipe state of an existing pipe removed according to the existing pipe removing method of the present invention.

FIG. 6 is an explanatory view showing an example of a cutting type crusher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crusher 3 Asbestos pipe 5 Shaft 7 Liquid injection tool 9 Drive 17 High pressure hose 19 Water supply tank 21 High pressure pump 25 Vacuum car 27 Sedimentation tank 40 Rotating shaft 42 Cutter 45 Base

Claims (10)

[Claims] 1. A method of inserting a liquid ejecting tool into an existing pipe, injecting a high-pressure liquid from the liquid ejecting tool into the pipe to crush the pipe, and collecting crushed pieces together with the liquid from below the pipe. Characteristic method of removing existing pipes. 2. A liquid ejecting tool is inserted into an existing pipe, high-pressure liquid is ejected from the liquid ejecting tool to the pipe to break the pipe, and the liquid ejecting tool is moved upward from below to lower the pipe downward. Crushing the pipe upward from above, or moving the liquid ejector downward from above to crush the pipe downward from above, and recovering the crushed pieces together with the liquid from below the pipe from the existing pipe. Removal method. 3. A method for removing an existing pipe, comprising inserting a cutter into the existing pipe, crushing the existing pipe from the inside thereof with the cutter, and collecting crushed pieces from below the pipe. 4. A pipe is inserted into an existing pipe, and while the pipe is sprayed or sprayed with liquid from the inside thereof, the pipe is crushed from the inside by the cutter,
A method for removing an existing pipe, wherein crushed pieces are collected together with the liquid from below the pipe. 5. A cutter inserted into an existing pipe is moved from above to below the existing pipe to crush the pipe from above to below, or the cutter is moved from below to above to move the pipe from below to above. The method for removing an existing pipe according to claim 4 or 5, wherein the pipe is crushed. 6. The method according to claim 1, wherein the crushed pieces are dropped below the pipe by the liquid, and the liquid for dropping is collected together with the crushed pieces from below the pipe. How to remove existing pipes. 7. A method for recovering crushed pieces and liquid in an existing pipe from below the pipe, separating the crushed pieces from the crushed pieces, and reusing the separated liquid as a liquid for spraying or spraying on the existing pipe or for dropping. The method for removing an existing pipe according to any one of claims 1 or 2, or claim 4, or claim 5, or claim 6. 8. The method according to claim 1, wherein the collected fragments and liquid are put into a sedimentation tank to separate the fragments and liquid.
A method for removing an existing pipe according to any one of claims 2 or 4 or 5 or 6 or 7. 9. The method for removing an existing pipe according to claim 8, wherein a sedimentation promoting material is mixed into the sedimentation tank to promote the sedimentation of the crushed pieces. 10. The method for removing an existing pipe according to claim 1, wherein the recovered crushed pieces are mixed with a coagulant and solidified before being carried out.