JP4286358B2 - How to remove existing pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of removing existing pipes piped in a building such as a condominium or a building, and in particular, piped from the bathroom to the roof as an exhaust pipe of a bath pot installed in the bathroom of the apartment. It is suitable for removing existing asbestos pipes (asbestos pipes).
[0002]
[Prior art]
Among housing complexes and condominiums, asbestos pipes are used for bathroom exhaust pipes and air supply pipes in relatively old buildings. For example, exhaust asbestos pipes are piped from a bathroom tub to the rooftop. There are as many asbestos pipes for supply and exhaust in the bathroom, and they are buried in the concrete walls of the building.
[0003]
When a building with an asbestos pipe buried in the wall is dismantled, asbestos, which has been pointed out to be carcinogenic, scatters in the air, so it is necessary to remove the asbestos pipe prior to dismantling the building. When removing asbestos pipes for exhaust in the bathroom, the conventional method is as follows.
[0004]
(1) Surround the bathroom with a plastic sheet to isolate it from the outside.
(2) Close the air supply and drain outlets connected to the outside of the bathroom with mortar.
(3) An operator wearing a dust mask and dust proof clothing crushes the internal asbestos pipe together with the concrete wall of the building using a small crusher (pick, etc.). At this time, in order to suppress the scattering of asbestos, the operation is performed while spraying a liquid (for example, water) for suppressing scattering to the crushing portion.
(4) The crushed lump is manually stored 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, etc., transported to the final disposal site and discarded.
[0005]
[Problems to be solved by the invention]
The conventional removal method described above has the following problems.
(1) Since it takes time and effort to enclose the work place with a vinyl sheet or the like and isolate it from the outside, the construction period becomes longer and the cost becomes higher.
(2) Since the work place surrounded by the vinyl sheet becomes hot and humid, the physical burden on the person working in it is large. Especially in summer, the burden is extremely heavy.
(3) Asbestos suction may not be completely prevented even if a dust mask is worn, and there is a problem in the health of workers.
(4) Since the liquid is crushed with a small crusher while spraying the liquid on the crushing place, the work is troublesome.
(5) In order to remove the internal asbestos pipe, the surrounding concrete wall must also be crushed, so it takes time to remove the asbestos pipe.
(6) The crushed concrete lumps are large and may not be transported outside manually. In that case, it is troublesome because it is necessary to break the concrete block into small pieces or to remove only asbestos pieces from the concrete block.
(7) Since the crushed lump is stored manually in a storage bag or the like, the work efficiency is poor and the labor burden on the operator is large.
(8) Since the asbestos tube that has been crushed may be scattered in the air as it is, it is obliged to dispose of it in a shut-off type final disposal site. However, because there are only a few final disposal sites in the country, transportation costs and disposal costs to the disposal sites are expensive.
(9) The whole removal work becomes costly with the above-mentioned various problems.
[0006]
[Means for Solving the Problems]
The object of the present invention is to solve the above-mentioned problems, and there is no risk of asbestos scattering during the removal work, so there is no need to partition the work place and isolate it from the outside, the work is easy and the work efficiency is high. Existing pipes that are good, have little labor burden on workers, have no health problems such as workers sucking carcinogenic asbestos, and are easy to collect and dispose of crushed asbestos pipes and are inexpensive Is to provide a removal method. This removal method is as follows.
[0007]
In the first existing pipe removal method of the present application, a liquid jetting tool is inserted into the existing pipe, high pressure liquid is jetted from the liquid jetting tool into the pipe, the pipe is crushed, and the crushed pieces are taken together with the liquid. It is collected from below the pipe.
[0008]
The second existing pipe removal method of the present application is that a liquid injector is inserted into the existing pipe, high pressure liquid is injected from the liquid injector into the pipe, the pipe is crushed, and the liquid injector is moved upward from below. The pipe is crushed from the lower side to the upper side, or the liquid jetting tool is moved from the upper side to the lower side to crush the pipe from the upper side to the lower side, and the crushed pieces are collected together with the liquid from the lower side of the pipe. Is.
[0009]
[0010]
The third existing pipe removal method of the present application is that the cutter is inserted into the existing pipe, and the pipe is crushed from the inside by the cutter while the liquid is sprayed or blown from the inside to the pipe, and the crushed pieces are separated from the liquid. At the same time, it is recovered from below the pipe.
[0011]
In the fourth existing pipe removal method of the present application, the cutter inserted into the existing pipe is moved downward from above the existing pipe to crush the pipe from above to below, or the cutter is moved from below to above. The pipe is crushed from below to above.
[0012]
In the fifth existing pipe removing method of the present application, the crushed pieces are dropped below the pipe by the liquid, and the dropping liquid is collected from below the pipe together with the crushed pieces.
[0013]
Sixth removing method of the existing pipe of the present application, the fragments and the liquid within the existing pipe separated from the crushed pieces were recovered from the lower of the pipe, injecting the separated liquid into the existing pipe or spraying or dropping It is reused as a liquid for use.
[0014]
The seventh existing pipe removing method of the present application is to separate the crushed pieces and the liquid by putting the recovered crushed pieces and liquid into a settling tank.
[0015]
In the eighth existing pipe removal method of the present application, a sedimentation promoting material is mixed in the sedimentation tank to promote sedimentation of crushed pieces.
[0016]
In the ninth existing pipe removal method of the present application, the recovered crushed pieces are mixed with a coagulant and solidified before being transported.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
1st Embodiment which is an example of the removal method of the existing pipe of this invention is described based on FIGS. This removal method is an example of removing existing pipes (asbestos pipes) 3 piped from the bathroom to the roof of each floor of a building (the one shown in FIG. 5 is a five-story apartment house) as shown in FIG. is there. In this removal method, the asbestos pipe 3 is crushed from the inside with a water jet type high-pressure liquid. For this purpose, the liquid jetting tool 7 of the water jet type crusher 1 is inserted into the existing pipe 3 (FIG. 1), high pressure liquid is jetted from the liquid jetting tool 7 to the existing pipe 3, and the pipe 3 is crushed. In this method, the crushed pieces are collected from the lower end of the existing pipe 3 together with the jetted liquid, the collected crushed pieces and the liquid are separated by the settling tank 27 (FIG. 3), and the separated liquid is reused.
[0018]
As shown in FIG. 1, the crusher 1 has a liquid injection tool 7 attached to the lower end of a hollow shaft 5, and the shaft 5 can be rotated in the circumferential direction of the asbestos tube 3 by a driving device 9. It can be moved up and down in the direction. A desired number of other 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 coupled, a male screw formed on one outer peripheral surface in the longitudinal direction of one shaft 5 and a female formed on an inner peripheral surface in one longitudinal direction of the other shaft 5. The shafts 5 are connected to each other by screwing the screws. As shown in FIG. 2, the liquid ejector 7 has a cylindrical shape slightly larger in diameter than the shaft 5, and laterally directed nozzles (bit nozzles) 11 are provided obliquely downward on the two sides of the outer peripheral surface and 1 on the bottom surface. Two downward spray nozzles (bit nozzles) 12 are projected.
[0019]
The driving device 9 includes an electric motor that is operated by power supply from a commercial power source or a generator, a rotating mechanism that rotates by the operation, and an elevating mechanism, and the shaft 5 is connected to the existing asbestos pipe 3 by driving the rotating mechanism. 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 the lifting mechanism. The rotating mechanism and the lifting mechanism may be driven by separate motors.
[0020]
The sedimentation tank 27 in FIG. 3 precipitates and separates the crushed pieces collected together with the liquid and separates them from the liquid. The rectangular tank 29 is partitioned by two partition plates 31 having different heights, and the tank 29 is divided into three sedimentation chambers 33 whose volume gradually decreases from the left side to the right side of the figure.
[0021]
In order to remove the asbestos pipe 3 embedded in the concrete wall 23 of the building using the above equipment, the following is performed (this removal method is one of the removal methods of the present invention).
(1) A television camera (for example, a CCD camera) is inserted into the existing asbestos tube 3 to check the internal state of the asbestos tube 3. When the seam of the asbestos pipe 3 is shifted or the reinforcing bars protrude in the existing asbestos pipe 3, they are removed beforehand.
(2) The crusher 1 is moved in the vertical direction and / or the horizontal direction so that the center axis of the shaft 5 of the crusher 1 and the center axis of the existing asbestos pipe 3 are aligned.
(3) As shown in FIG. 1, the shaft 5 to which the liquid ejector 7 is attached is supported by a cage 15 assembled on the roof of the building and inserted into the existing asbestos pipe 3, and the liquid ejector 7 is installed in the existing asbestos pipe. Insert to the bottom of 3. At this time, the required number of shafts 5 are added until the liquid ejecting tool 7 reaches the lower end of the existing asbestos pipe 3.
(4) The high pressure hose 17 is connected to the upper end of the shaft 5, and liquid (for example, water) pumped up from the water supply tank 19 (FIG. 4) by the high pressure pump 21 (FIG. 4) is supplied to the high pressure hose 17. Is sprayed from the two lateral spray nozzles 11 of the liquid sprayer 7 toward the inner peripheral surface of the existing asbestos pipe 3, and the existing asbestos pipe 3 is crushed from the inside. At this time, the shaft 5 is rotated continuously or intermittently in the circumferential direction of the existing asbestos pipe 3, high-pressure water is sprayed on the entire circumferential surface of the existing asbestos pipe 3, and the entire circumferential surface is crushed. Moreover, the shaft 5 is pulled up continuously or intermittently to lift the liquid ejector 7 and the existing asbestos pipe 3 is sequentially crushed from the lower end toward the upper end. At this time, the concrete wall 23 in which the existing asbestos pipe 3 is embedded may be crushed simultaneously. When a plurality of pulled-up shafts 5 are connected, the shaft 5 is lifted and the unnecessary shafts 5 are sequentially removed.
(5) The existing asbestos pipe 3 is crushed from the inside as described above, and at the same time, 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 be crushed. The surrounding concrete wall 23 crushed simultaneously with the asbestos pipe 3 and the existing asbestos pipe 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 the vacuum wheel 25 (FIG. 4) through the hose 24 (preferably a flexible hose), and are collected in the settling tank 27 (FIG. 3). Place in the leftmost sedimentation chamber 33.
(7) Most of the crushed pieces in the sedimentation chamber 33 are deposited and deposited on the bottom, and the crushed pieces and water remaining without being settled cross over the partition plate 31 (overflow), and the central sedimentation chamber 33 Move on. In this sedimentation chamber 33, a part of the fragmented pieces settles and accumulates on the bottom, and the remaining fragmented pieces and water overflow and move to the sedimentation chamber 33 at the right end. Also in this sedimentation chamber 33, crushed pieces settle and deposit on the bottom, and the upper layer is only water containing almost no crushed pieces.
(8) The upper layer filtered water in the sedimentation chamber 33 at the right end is pumped up by the high pressure pump 21, returned to the high pressure hose 17, and reused as water sprayed from the spray nozzles 11 and 12.
(9) After crushing the existing asbestos pipe 3 by the above operation, a CCD camera is inserted into the crushing trace (removal trace) to check the internal situation. When the existing asbestos pipe 3 remains, the above operation is performed again to completely remove the remaining existing asbestos pipe 3.
[0022]
In order to collect the crushed pieces together with 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. 1 to facilitate connection to the lower end of the existing asbestos pipe 3. At the same time, it is desirable that there is no gap between the existing asbestos pipe 3 and the hose 24.
[0023]
When the liquid is filtered by precipitating the crushed pieces in the settling tank 27, mixing the precipitation promoting material (for example, volcanic ash) into the settling tank 27 improves the sedimentation speed and filtration efficiency of the crushed pieces. desirable.
[0024]
In this embodiment, the rotation speed of the liquid ejector 7 is 180 times / minute, the ascending speed is 30 cm / minute, and the amount of spray water is 12 to 14 liters / minute. In this case, a pressure of 2000 kg is applied to the existing asbestos pipe 3 per square centimeter, and the existing asbestos pipe 3 is crushed into powder. These numerical values are merely examples, and the rotational speed and other numerical values are not limited to those described above. However, from the viewpoint of obtaining the same crushing effect, it is preferable to lower the rising speed to about 15 cm / min when the jetting pressure is lowered while the rotational speed of the liquid jetting tool 7 is the same as described above. Moreover, the liquid injection tool 7 can also be moved toward the lower end from the upper end of the existing asbestos pipe 3, and even in that case, the same crushing effect as described above can be obtained.
[0025]
(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 crusher 1 has a cutter 42 attached to the tip of a rotary shaft 40, and the rotary 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 or a superalloy cutter can be used as the cutter 42, but in the embodiment shown in FIG. 6, a superalloy or diamond blade is formed on the surface of a substantially conical base 45 as the cutter 42. 47 is used, and the blade 47 is rotated while being in contact with the inner peripheral surface of the existing asbestos pipe 3, so that the existing asbestos pipe 3 is cut and crushed from the inside. The cutter 42 is not limited to the structure shown in FIG. 6, and any other structure can be used as long as it can rotate in contact with the inner peripheral surface of the existing asbestos pipe 3 and cut and crush the existing asbestos pipe 3 from the inside. You can also A flexible shaft can be used as the rotating shaft 40. When it is used, the existing asbestos pipe 3 bent can be crushed. As the driving device, the same driving device as that of the water jet type crusher 1 can be used.
[0026]
When the existing asbestos pipe 3 embedded in the concrete wall 23 of the building is removed using the cutting type crusher 1, the following is performed (this removal method is different from that of the removal method of the present invention). Example).
(1) A television camera (for example, a CCD camera) is inserted into the existing asbestos tube 3 to check the internal state of the asbestos tube 3. When the cutting crusher 1 is used, it is not necessary to remove the joints of the asbestos pipe 3 or the reinforcing bars projecting in the existing asbestos pipe 3, but they may be removed.
(2) The crusher 1 is moved in the vertical direction and / or the horizontal direction so that the center axis of the shaft 5 of the crusher 1 and the center axis of the existing asbestos pipe 3 are aligned.
(3) The cutter 42 is supported on the roof 15 assembled on the roof of the building, inserted into the existing asbestos pipe 3, and the cutter 42 rotated by the driving device is brought into contact with the inner surface of the existing asbestos pipe 3. 3 is cut and crushed. In this case, in order to prevent the asbestos tube 3 to be crushed from scattering, it is desirable to spray the liquid (for example, water) from the inside of the asbestos tube 3 to the asbestos tube 3 or to cut and crush while spraying. . At this time, the concrete wall 23 in which the existing asbestos pipe 3 is embedded may be crushed simultaneously. In order to spray water, for example, the high pressure hose 17 is connected to the upper end of the rotary shaft 40, and the water pumped up by the high pressure pump 21 (FIG. 4) from the water supply tank 19 (FIG. 4) is supplied to the high pressure hose 17. The water is jetted toward the inside of the existing asbestos pipe 3 from the jet port provided in the rotary shaft 40 or the cutter 42. In this case, before spraying the existing asbestos pipe 3, when spraying water on the inner peripheral surface of the asbestos pipe 3, the spray port is provided below the cutter 42, and when spraying water while crushing, it is above the cutter 42. It is desirable to provide an injection port in the nozzle. Further, it is desirable that the crushing of the asbestos pipe 3 proceeds sequentially from the upper end side to the lower end side. At this time, if the shaft 5 becomes insufficient, the required number of other shafts 5 are added.
(4) As described above, the existing asbestos pipe 3 is crushed from the inside thereof, and at the same time, 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 crushed simultaneously with the existing asbestos pipe 3 (hereinafter collectively referred to as “crushed pieces”) are dropped down (poured).
(5) The crushed pieces are sucked together with the water in the existing asbestos pipe 3 through the hose 24 (preferably a flexible hose) by the vacuum wheel 25 (FIG. 4), and the settling chamber at the left end of the settling tank 27 (FIG. 3). Put in 33.
(6) Most of the crushed pieces in the sedimentation chamber 33 are deposited and deposited on the bottom thereof, and the crushed pieces and water remaining without being settled over the partition plate 31 (overflow). Move on. In this sedimentation chamber 33, a part of the fragmented pieces settles and accumulates on the bottom, and the remaining fragmented pieces and water overflow and move to the sedimentation chamber 33 at the right end. Also in this sedimentation chamber 33, crushed pieces settle and deposit on the bottom, and the upper layer is only water containing almost no crushed pieces.
(7) The upper layer filtered water in the right precipitation chamber 33 is pumped up by the high-pressure pump 21 and returned to the high-pressure hose 17 to be reused as water sprayed to the existing asbestos pipe 3 or water for dropping.
(8) After crushing the existing asbestos pipe 3 by the above operation, a CCD camera is inserted into the crushing trace (removal trace) to check the internal situation. When the existing asbestos pipe 3 remains, the above operation is performed again to completely remove the remaining existing asbestos pipe 3.
[0027]
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. Further, 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 even if it is moved in such a manner.
[0028]
(Embodiment 3)
In the removal method using a cutter, the existing asbestos pipe 3 can be cut and crushed by the cutter 42 without spraying the anti-scattering liquid (for example, water) onto the existing asbestos pipe 3. In this case, it is desirable that the upper end or / and the lower end of the existing asbestos pipe 3 is closed with a cover made of rubber or resin, a thin plate, a film or the like to prevent the asbestos from being scattered outside the existing asbestos pipe 3. . This lid does not hinder the 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 cutting and crushing, and the crushed pieces are dropped downward (poured), and the crushed pieces and water are collected and precipitated. Precipitate in bed, filter and reuse.
[0029]
Although the said Embodiments 1-3 demonstrated the case where the asbestos pipe 3 embed | buried in the concrete wall 23 of a building was crushed and removed, the removal method of the existing pipe of this invention is removal of various pipes other than an asbestos pipe Of course, it can be used for crushing and removing various pipes that are not embedded in the concrete wall.
[0030]
【The invention's effect】
The first existing pipe removing method of the present application has the following effects because the existing pipe is crushed from the inside with high-pressure liquid.
(1) Save time and labor for crushing concrete walls around existing pipes.
(2) Since there is no possibility that crushed pieces and powders are scattered in the air, it is not necessary to enclose the work place with a sheet or the like and isolate it from the outside, and the labor for enclosure becomes unnecessary.
(3) There is no need to perform crushing work while spraying the splash suppression liquid.
(4) Since there is no need for the operator to perform crushing work in a closed work place, the work environment is remarkably improved, the labor burden on the worker is greatly 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 possibility that asbestos is scattered during the collection as well as during the crushing.
[0031]
In the second existing pipe removal method of the present application, the liquid jetting tool is moved from the lower side to the upper side or from the upper side to the lower side to crush the pipe, so that the existing pipe can be crushed evenly. There is no left. Further, when moved from the lower side to the upper side, the crushed pieces sequentially fall downward (in the 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.
[0032]
[0033]
The third existing pipe removal method of the present application has the following effects because the existing pipe is crushed from the inside by a cutter while spraying or spraying liquid on the inner peripheral surface of the pipe.
(1) Save time and labor for crushing concrete walls around existing pipes.
(2) Since there is no possibility that crushed pieces and powders are scattered in the air, it is not necessary to enclose the work place with a sheet or the like and isolate it from the outside, and the labor for enclosure becomes unnecessary.
(3) There is no need to perform crushing work while spraying the splash suppression liquid.
(4) Since there is no need for the operator to perform crushing work in a closed work place, the work environment is remarkably improved, and the labor burden on the worker is greatly reduced. The problem is solved.
(5) Since the crushed pieces are collected together with the jetted liquid, there is no possibility that asbestos is scattered during the collection as well as during the crushing.
[0034]
In the fourth existing pipe removal method of the present application, the existing pipe can be crushed by moving the cutter from the lower side of the existing pipe to the upper side or from the upper side to the lower side. Absent.
[0035]
In the fifth existing pipe removal method of the present application, the crushed pieces are dropped below the pipe by the liquid, so that the crushed pieces are not clogged in the pipe and the movement of the liquid ejector or the cutter is not hindered.
[0036]
In the sixth existing pipe removal method 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 scattering, or a liquid to be dropped. Consumption is reduced and costs are reduced.
[0037]
In the seventh existing pipe removal method of the present application, the recovered crushed pieces and liquid are put into a sedimentation tank and separated into crushed pieces and liquid, so that when the liquid is reused, the crushed pieces are mixed into the liquid. There is nothing. Therefore, the smashing piece does not clog the spray nozzle of the crusher or clog the hose, causing a failure or malfunction.
[0038]
In the eighth existing pipe removal method of the present application, the sedimentation accelerator is mixed in the settling tank to promote the precipitation of the crushed pieces, so that the crushed pieces and the liquid can be quickly separated, and the working efficiency is improved. .
[0039]
In the ninth method for removing an existing pipe of the present application, since the recovered crushed pieces are mixed with a coagulant and solidified before being transported, there is no possibility of asbestos scattering during the transport. In addition, if solidified so that there is no risk of asbestos scattering, it is not treated as asbestos when it is disposed at the disposal site, so that it is not necessary to dispose of it in a shut-off final disposal site, thereby reducing the disposal cost.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of a crusher used in a method for removing an existing pipe according to the present invention.
FIG. 2 is an enlarged explanatory view showing a liquid injection tool of a crusher.
FIG. 3 is an explanatory view showing an example of a sedimentation tank used in the method for removing an existing pipe of the present invention.
FIG. 4 is a schematic view showing an example of an embodiment of a method for removing an existing pipe of the present invention.
FIG. 5 is an explanatory view showing an example of a piping state of an existing pipe removed by the existing pipe removing method of the present invention.
FIG. 6 is an explanatory view showing an example of a cutting crusher.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crusher 3 Asbestos pipe 5 Shaft 7 Liquid injection tool 9 Drive device 17 High pressure hose 19 Water supply tank 21 High pressure pump 25 Vacuum wheel 27 Settling tank 40 Rotating shaft 42 Cutter 45 Base

Claims (9)

  An existing pipe, wherein a liquid jetting tool is inserted into an existing pipe, high pressure liquid is jetted from the liquid jetting tool to the pipe, the pipe is crushed, and the crushed pieces are collected together with the liquid from below the pipe. Removal method.   A liquid ejector is inserted into an existing pipe, high pressure liquid is ejected from the liquid ejector to the pipe, and the pipe is crushed. The liquid ejector is moved from below to above, and the pipe is crushed from below to above. Alternatively, a method for removing an existing pipe is characterized in that the liquid ejector is moved from above to below to crush the pipe from above to below, and the crushed pieces are collected together with the liquid from below the pipe.   The cutter is inserted into an existing pipe, and the pipe is crushed from the inside by the cutter while the liquid is blown or blown from the inside to the pipe, and the crushed pieces are collected together with the liquid from below the pipe. How to remove existing pipes. The cutter inserted into the existing pipe is moved from the upper side to the lower side of the existing pipe to crush the pipe from the upper side to the lower side, or the cutter is moved from the lower side to the upper side to crush the pipe from the lower side to the upper side. The method for removing an existing pipe according to claim 3, wherein: The method for removing an existing pipe according to any one of claims 1 to 4 , wherein the crushed pieces are dropped below the pipe by the liquid, and the dropping liquid is collected together with the crushed pieces from below the pipe. . The crushed pieces and liquid in the existing pipe are collected from below the pipe and separated from the crushed pieces, and the separated liquid is reused as a liquid for spraying, spraying or dropping on the existing pipe. The removal method of the existing pipe in any one of Claim 1 thru | or 5 . The method for removing an existing pipe according to any one of claims 1 to 6 , wherein the collected crushed pieces and liquid are put in a settling tank to separate the crushed pieces and liquid. The method for removing an existing pipe according to claim 7 , wherein a sedimentation promoting material is mixed in the sedimentation tank to promote sedimentation of the crushed pieces. The method for removing an existing pipe according to any one of claims 1 to 8 , wherein the recovered crushed pieces are mixed with a coagulant and solidified before being transported.

Images