JP2016138587A - Piping removal tool and piping removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a piping mainly to be easily removed without chipping a slab.SOLUTION: This invention relates to a piping removal tool 4 for removing a piping 3 buried in a slab 2 while being passed through it without chipping the slab 2. This invention comprises a rotary blade 12 having the same diameter as an outer diameter of the piping 3 or an effective cutting radius more than a thickness of the piping 3 and capable of cutting the piping 3 along an axial direction 11; a rotary driving part 13 for rotatably driving this rotary blade 12; and an axial direction guiding mechanism 14 for moving the rotary blade 12 inserted into the piping 3 along the axial direction 11 of the piping 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pipe removing tool and a pipe removing method.

  For example, a drainage system is provided in a building or the like. And the vertical pipe line which comprises this drainage system is provided so that the floor part (floor slab) of each floor may be penetrated up and down.

  And when removing the vertical pipe to refurbish the drainage system, conventionally, the floor slab is hung (squeezing = scraping) and the vertical pipe using a large-scale device such as a jack. The whole vertical piping constituting the slab was pulled out from the slab (for example, see Patent Document 1).

JP 2010-230112 A

  However, when the vertical pipe is removed as described above, there is a problem that noise, vibration, dust, and the like are generated when the floor slab is hung. Moreover, in the case of patent document 1, there existed a problem that large apparatuses, such as a jack, were needed in order to pull out the whole vertical piping from a slab. Such a large-scale apparatus cannot be installed in a narrow place such as a pipe space where vertical pipes are installed, and often has to hang a floor slab.

  In particular, the floor slab in the meter box provided in the building has a cinder concrete layer for height adjustment stacked on it, and a horizontal pipe is embedded in the cinder concrete layer. In some cases, sticking a cinder concrete layer may damage horizontal pipes such as gas pipes and water supply / drainage pipes embedded in the cinder concrete layer.

  Accordingly, the main object of the present invention is to solve the above-described problems.

In order to solve the above problems, the present invention provides:
A pipe removal tool for removing a pipe embedded in a slab without penetrating the slab,
A rotary blade having a diameter equivalent to the outer diameter of the pipe, or having an effective cutting radius equal to or greater than the thickness of the pipe, and capable of cutting the pipe along the axial direction;
A rotation drive unit that rotationally drives the rotary blade;
An axial direction guide mechanism for moving the rotary blade inserted into the pipe along the axial direction of the pipe is provided.
The present invention also provides:
A pipe removal method that removes pipes embedded in a slab without penetrating the slab,
The pipe is cut along the axial direction, and the cut piece of the pipe is removed from the slab.

  According to the present invention, with the above configuration, the pipe can be easily removed without holding the slab.

It is a figure (longitudinal pipe line of a drainage system of a building) which shows piping using a piping removal tool and a piping removal method concerning this embodiment. It is a longitudinal cross-sectional view which shows the piping removal tool and piping removal construction method concerning this Embodiment. FIG. 3 is a plan view of FIG. 2. It is a partial expansion perspective view which shows the example of the protrusion for guides comprised so that attachment or detachment is possible. It is a partial expansion perspective view which shows the other example of the protrusion for guides comprised so that attachment or detachment is possible. It is a side view of another piping removal tool. (A) (b) (c) is a figure which shows how to cut | disconnect piping, respectively. It is a side view which shows the slab and piping which show a piping removal construction method.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 6 are for explaining this embodiment.

<Configuration> The configuration will be described below.
As shown in FIG. 1, in order to remove the pipe 3 penetrating the slab 2 constituting the building 1 or the like without holding the slab 2 (cuttering = shaving), FIG. A pipe removing tool 4 as shown in the longitudinal sectional view or the plan view of FIG. 3A is used. And using this piping removal tool 4, the following piping removal construction methods are performed.

  In addition, in this Example, about the example which removes the vertical pipe line (pipe 3) of the drainage system which penetrates the floor slab (slab 2) which comprises the floor part of each floor of buildings 1 such as an apartment house and a detached house up and down. explain. In this case, the vertical pipe (drainage vertical pipe) is a resin pipe such as polyvinyl chloride or polyethylene, or a metal pipe such as cast iron. The vertical pipe line is embedded in the mortar 2b in a state of being inserted and disposed in the through hole portion 2a formed in the floor slab. The vertical pipe line is formed by connecting a plurality of pipe members in the vertical direction. Some vertical pipes are connected to horizontal pipes arranged in each floor. When performing the pipe removal method, first, as shown by lines x and y in FIG. 1, the vertical pipes have portions (protrusions 3a and 3b) protruding from the floor slab, and the required amount (generally 5 cm). Cut about 10 cm).

  Further, the pipe 3 to be removed is not limited to the drainage system, but can also be applied to removing various pipes such as a hot water supply / hot water supply system, a cold / hot water pipe system for air conditioning, and a gas pipe and a conduction pipe. Furthermore, the present invention is not limited to the vertical pipe passing through the floor slab (slab 2), and may be applied to a horizontal pipe passing through the wall surface.

(1) And the pipe removal tool 4 described above has a diameter equivalent to the outer diameter of the pipe 3 as shown in FIGS. 2 and 3A, or the wall thickness of the pipe 3 as shown in FIG. A rotary blade 12 having an effective cutting radius equal to or greater than that and capable of cutting the pipe 3 along the axial direction 11;
A rotation drive unit 13 for rotating the rotary blade 12, and
An axial guide mechanism 14 for moving the rotary blade 12 inserted into the pipe 3 along the axial direction 11 of the pipe 3 is provided.

  Here, the effective cutting radius is a portion of the radius of the rotary blade 12 used for cutting the thickness of the pipe 3. The axial direction 11 is the vertical direction as shown in FIGS. However, the axial direction 11 of the pipe 3 is not limited to this.

  The rotational drive unit 13 is configured to rotationally drive the rotary blade 12 by a driving device such as a motor. A driving force transmission mechanism is provided between the rotary drive unit 13 and the rotary blade 12 as necessary. An attachment / detachment portion (such as a chuck portion and a set screw) for attaching / detaching the rotary blade 12 is provided on the rotation shaft (output shaft) of the rotation drive unit 13 or the driving force transmission mechanism. It is preferable that the rotation drive unit 13 has a size that can be inserted inside the pipe 3. In the case of FIG. 2, the rotation drive unit 13 is accommodated in a tool body 15 that can be inserted into the inside of the pipe 3. However, for example, when the pipe 3 has a small diameter and the rotation drive unit 13 cannot be inserted, the rotary blade 12 is rotatably attached to a tool body 15 having a size that can be inserted into the pipe 3. The rotational drive unit 13 is separated from the tool main body 15 and installed outside the pipe 3, and the drive force between the rotational drive unit 13 and the rotary blade 12 is different from the above, for example, a belt type or a remote type drive force. You may make it connect by a transmission mechanism.

  The rotary blade 12 can be a thick blade or a thin blade. If it cuts using a thick blade, since it will become easy to crush piping 3 after cutting, removal will become easy. On the other hand, if it cuts using a thin blade, since it will become easy to cut piping 3, cutting time will become short and generation time of noise can be shortened.

  In this case, the axial direction guide mechanism 14 mainly includes a fitting portion 16 that can be externally fitted to the upper protruding portion 3a of the pipe 3 from above, and a protruding portion 3a on the upper side of the pipe 3 from the fitting portion 16. The guide cylinder portion 18 has an extension portion 17 that extends longer than that. The guide tube portion 18 is a resin tube or a metal tube. When the guide tube portion 18 is made of a resin tube, the degree of insertion of the rotary blade 12 can be visually confirmed if it is made of a transparent material.

  A guide protrusion 19 for guiding the rotary blade 12 in the axial direction 11 is provided on the inner peripheral surface of the guide cylinder portion 18 at a position approximately 180 ° apart in the circumferential direction. The guide ridges 19 are provided in pairs so as to sandwich both surfaces of the rotary blade 12 with a gap (two pairs in total). The two pairs of guide protrusions 19 have an amount of protrusion between a position that is half the thickness of the pipe 3 and a position that is substantially equal to the position of the inner peripheral surface of the pipe 3, and an extension portion of the guide cylinder portion 18. 17 is formed integrally with the pipe 3 so as to extend in the axial direction 11 of the pipe 3. Then, the lower ends of the two pairs of guide protrusions 19 are engaged with the upper end surface of the upper projecting portion 3a of the pipe 3 from above, thereby forming an engaging portion that serves as a vertical positioning portion. . At this time, since the upper surface of the slab 2 is not flat, the vertical positioning may be performed by floating so that the lower end portion of the guide tube portion 18 does not contact the upper surface of the slab 2. In this case, the protruding portion 3 a on the upper side of the pipe 3 may be cut so as to be longer than the fitting portion 16 of the guide cylinder portion 18.

The guide protrusion 19 may be formed separately from the guide tube portion 18 instead of being integrated with the guide tube portion 18. In this case, as shown in FIG. 3B, the guide protrusion 19 may be formed integrally with the cylindrical body 19a that fits in the extension portion 17, or, as shown in FIG. Only the guide protrusion 19 may be exchanged with respect to the extension portion 17 via a slide fitting portion 19b (detachable with respect to the axial direction or the like).
In this way, by making the guide protrusion 19 separate from the guide tube portion 18, it is possible to correspond to the diameters of various pipes 3 simply by replacing the guide protrusion 19. Further, the guide protrusion 19 is easily damaged by the rotary blade 12 or deteriorated by high-speed dust. However, when the guide protrusion 19 is damaged, the guide protrusion 19 can be replaced repeatedly. It will be able to withstand use.

  (2) Alternatively, as shown in FIG. 4, the pipe removing tool 4 has a rotary blade 12 having an effective cutting radius equal to or greater than the wall thickness of the pipe 3 via the radial position adjusting mechanism 21. It may be attached so that its position can be adjusted in the radial direction 22.

  Here, although the rotary blade 12 may be provided only at one place, it is preferable to provide a pair of left and right so that two positions of the pipe 3 that are separated from each other in the diameter direction can be cut simultaneously. Each rotary blade 12 may be connected with a dedicated rotation drive unit 13 or may be connected with a common rotation drive unit 13 so that the drive force is distributed by a drive force transmission mechanism such as a gear or a belt. good.

  The radial position adjustment mechanism 21 may be an opening angle adjustment mechanism that supports the pair of rotary blades 12 so that they can be opened and closed.

  This opening angle adjustment mechanism is, for example, a rectangular link in which a pair of left and right open / close arms 23 and a pair of left and right auxiliary arms 24 are connected to each other using four connecting shaft portions 25 so that they can be expanded and contracted in the same plane. An openable / closable attachment portion 26 for attaching the square link to the tool body 15 so that the pair of opening / closing arms 23 is opened / closed, an opening / closing operation portion 27 for causing the pair of opening / closing arms 23 to perform an opening / closing operation, It is supposed to have.

  The quadrangular link is formed by connecting the base end portions of the pair of left and right auxiliary arms 24 to the vicinity of the distal end portions of the pair of left and right opening / closing arms 23. A pair of rotary blades 12 or a pair of small rotary drive units 13 provided with the rotary blades 12 are attached to the distal ends of the pair of left and right open / close arms 23.

  The openable / closable attachment portion 26 includes an attachment hole 26a for attaching the connecting shaft portion 25 (fixed shaft 25a) for connecting the distal ends of the pair of left and right auxiliary arms 24 to the distal end side of the tool body 15 in a fixed state, The connecting shaft portion 25 (slide shaft 25b) for connecting the base end portions of the pair of opening / closing arms 23 has a slide hole 26b for slidably attaching to the base end side of the tool body 15. The slide hole 26 b extends in the longitudinal direction of the tool body 15 installed in parallel with the axial direction 11 of the pipe 3.

  The opening / closing operation portion 27 is a connecting shaft portion that connects between a rotatable screw shaft 27 a disposed inside the tool main body 15 along the slide hole 26 b and the base end portions of the pair of left and right opening / closing arms 23. 25 (slide shaft 25b), and a ball screw mechanism having a nut 27b screwed to the screw shaft 27a so as to be displaceable. The screw shaft 27a is rotated by manual operation or electric operation using a motor or the like. When the screw shaft 27a is manually rotated, for example, an operation unit such as a handle is attached to a base end portion (in this case, an upper end portion) of the screw shaft 27a protruding from the upper end portion of the tool body 15. It can be detachably provided. The slide hole 26b can be provided with a mark 28 (a scale, a mark, an uneven shape, etc.) for measuring the position of the rotary blade 12 in the radial direction 22 based on the position of the nut 27b. Inside the tool body 15, there are provided bearing portions 29 that rotatably support both ends of the screw shaft 27a or the vicinity thereof.

  Then, by rotating the screw shaft 27a, the nut 27b screwed to the screw shaft 27a is moved along the screw shaft 27a. Thereby, the connection shaft part 25 (slide shaft 25b) provided in the nut 27b is moved along the slide hole 26b. Then, the movement of the connecting shaft portion 25 (slide shaft 25b) changes the distance between the connecting shaft portion 25 and the connecting shaft portion 25 (fixed shaft 25a), so that the quadrangular link is expanded or contracted. As a result, the position of the pair of rotary blades 12 attached to the tip of the open / close arm 23 of the square link is adjusted in the radial direction 22.

  In addition to the above, the following configuration may be provided. The following is a configuration common to the above (1) and (2).

(3) Circumferential cutting position changing mechanism As shown in FIGS. 2 and 3A, the axial guide mechanism 14 changes the cutting position of the rotary blade 12 with respect to the circumferential direction 31 (see FIG. 3A) of the pipe 3. A possible circumferential cutting position changing mechanism 32 is provided.

  Here, the circumferential cutting position changing mechanism 32 has a radial direction 22 with respect to the screw hole 33 formed in the lower fitting portion 16 that is directly fitted to the protruding portion 3 a of the pipe 3 in the guide cylinder portion 18. The circumferential position adjusting screw 34 or the like screwed toward the head can be used. When the guide tube portion 18 is made of resin, the screw hole 33 may be formed by embedding a threaded sleeve 35 or the like in the guide tube portion 18. The circumferential position adjusting screw 34 may be provided at least in one place in the circumferential direction 31, but by providing three or more places in the circumferential direction 31, the guide tube portion 18 may have a centering function for the pipe 3. Can do. The circumferential position adjusting screw 34 can be used for positioning in the vertical direction together with the above-described guide protrusion 19 by using it so as to strongly abut against the outer peripheral surface of the pipe 3.

  In addition to the above, the circumferential cutting position changing mechanism 32 includes, for example, a pin hole formed in the lower fitting portion 16 of the guide cylinder portion 18 and a positioning pin that can be inserted into the pin hole from the outside. Also good. In this case, the projecting portion 3a of the pipe 3 is formed so that a hole that matches the pin hole is formed later, and the positioning pin is inserted so as to straddle both the pin hole and the hole. To do.

(4) Dust-proof cover A dust-proof cover 41 is attached to the front side of the rotary blade 12.

  Here, the near side of the rotary blade 12 is the near side in the cutting direction of the pipe 3. In the case of FIG. 2, the upper side of the rotary blade 12. The dust cover 41 is attached to an intermediate portion of the tool main body 15 (such as the rotation drive unit 13). The dustproof cover 41 is a disk-shaped one having a diameter that can be inserted into the pipe 3. The dust cover 41 is attached to the rotation drive unit 13, the tool body 15, or the like with its surface directed in a direction perpendicular to the axis of the pipe 3. It is preferable that the dust cover 41 is detachably attached. When the dust cover 41 is detachable, the dust cover 41 is provided with a detachable portion for the tool body 15 and the like. The dust cover 41 is preferably made of a transparent resin so that the inside of the pipe 3 can be seen.

  If the disc-shaped dustproof cover 41 is moved to the axial direction 11 along the inner peripheral surface of the pipe 3 with a diameter substantially the same as the inner diameter of the pipe 3, a part of the axial guide mechanism 14 is provided. Can be used as. In particular, a guide protrusion 42 that protrudes inward from the inner peripheral surface of the pipe 3 is formed integrally with the inner peripheral surface of the extension portion 17 of the guide tube portion 18, and the guide protrusion is formed on the dust-proof cover 41. By forming the guide recess 43 guided by 42, the guide accuracy as a part of the axial guide mechanism 14 can be increased. When the disc-shaped dustproof cover 41 is used as a part of the axial guide mechanism 14, the extension 17 of the guide cylinder 18 is at least inside the guide cylinder 18 before cutting. It is preferable to set the length so that the dustproof cover 41 enters when the 15 is set.

  Alternatively, the dust cover 41 may have an outer diameter larger than the inner diameter of the extension portion 17 so as to cover the upper end portion of the extension portion 17 of the axial guide mechanism 14. In this case, the dust-proof cover 41 is structured so as to be fixed to the extension portion 17, and a hole into which the rotary blade 12 and the tool body 15 can be inserted is formed instead of the above-described guide protrusion 42 and guide recess 43. You may do it.

(5) Extension rod The rod attachment portion 52 capable of connecting the extension rod 51 that can be inserted into the deep part of the pipe 3 is provided in a portion on the near side of the rotary blade 12.

  Here, the extension rod 51 extends in the axial direction 11 of the pipe 3. The eaves mounting portion 52 is, for example, a female screw portion provided at the upper end portion of the tool main body 15 (the rotation driving unit 13 or the like). On the other hand, a male screw portion that can be screwed to the female screw portion is provided at the lower end portion of the extension rod 51. As shown in FIG. 4, the female screw portion and the female screw portion (such as the upper end portion of the screw shaft 27 a) may be reversed. Further, the hook attaching portion 52 is not limited to the female screw portion, and may be anything such as a one-touch joint or a twist lock as long as the extension hook 51 can be attached and detached.

  It is preferable that the extension rod 51 constituting the axial guide mechanism 14 can control the depth of cut with respect to the pipe 3 so that the rotary blade 12 can confirm how far the pipe 3 has been cut. . Therefore, a mark 56 (a scale, a mark, an uneven shape, etc.) for measuring the cutting depth can be formed on the extension rod 51.

Hereinafter, the pipe removing method using the pipe removing tool 4 will be described.
In this pipe removing method, the pipe 3 embedded in the slab 2 in a penetrating state is removed without holding the slab 2.

  When this pipe removing method is performed, first, as described above, the vertical pipe is cut while leaving a required amount (approximately 10 cm) of portions (protruding portions 3a and 3b) protruding vertically from the floor slab.

  (6) Then, the pipe 3 is cut along the axial direction 11, and the cut piece of the pipe 3 is removed from the slab 2.

  Here, for cutting the pipe 3, a general tool can be used, but it is preferable to use the pipe removing tool 4 described above. The number of cuts of the pipe 3 by the pipe removing tool 4 is preferably about 2 to 4 places. Then, the portion of the pipe 3 fixed to the slab 2 is peeled off by applying a force in the direction of crushing the cut pipe 3 toward the center, and the cut piece of the pipe 3 is removed from the slab 2. At this time, as described above, when the pipe 3 is cut at about four places, it can be easily peeled off from the slab 2 by bending the cut piece around the central axis of the pipe 3. The cutting direction of the pipe 3 may be a radial direction as shown in FIGS. 5A and 5B, or other than the radial direction as shown in FIG. Parallel orientation). Furthermore, a part of the pipe 3 may be cut using the pipe removing tool 4 described above, and a wedge-shaped cutting jig may be pushed into the pipe 3 to cut the remaining part of the pipe 3.

(7) At this time, first, as shown in FIG. 6, the release agent 71 or the weakening agent 72 for peeling or weakening the interface is infiltrated into the interface between the slab 2 and the pipe 3.
After the interface is peeled or weakened, the pipe 3 may be cut along the axial direction 11 and removed from the slab 2 as described above.

  Here, the release agent 71 can be a concrete release agent or the like. Further, the weakening agent 72 can be an acidic solution such as dilute hydrochloric acid or an acidic cleaning agent. The release agent 71 or the weakening agent 72 may be injected before the pipe 3 is cut or after the cut.

<Effect> According to this embodiment, the following effects can be obtained.
(1) According to the pipe removing tool 4 of this embodiment, the rotary blade 12 inserted into the pipe 3 is moved in the axial direction 11 of the pipe 3 by the axial guide mechanism 14. As a result, the rotary blade 12 is stably moved in the axial direction 11 of the pipe 3, and the pipe 3 is cut cleanly along the axial direction 11 while preventing the surroundings of the pipe 3 from being unnecessarily damaged. It becomes possible to do. As a result, the pipe 3 can be removed without holding the slab 2. Therefore, generation of noise, vibration, dust and the like can be minimized. Further, a large-scale device such as a jack device for pulling out the entire pipe 3 from the slab 2 becomes unnecessary. Furthermore, even if another pipe 3 (for example, a pipe 3 for electricity, gas, water, etc.) is located in the vicinity of the pipe 3 to be removed, these are hardly affected.

  (2) The rotary blade 12 having an effective cutting radius equal to or greater than the wall thickness of the pipe 3 is attached to the radial position adjusting mechanism 21 capable of adjusting the position of the pipe 3 with respect to the radial direction 22. As a result, various pipes 3 having different diameters can be widely handled only by adjusting the position of the rotary blade 12 without replacing the rotary blade 12. Therefore, it is possible to eliminate the trouble of replacing the rotary blade 12 according to the size (diameter dimension) of the pipe 3 and the need to prepare a plurality of types of rotary blades 12. This structure is particularly effective when the pipe 3 has a large diameter.

  (3) The axial direction guide mechanism 14 includes a circumferential cutting position changing mechanism 32. Thereby, the cutting position of the rotary blade 12 with respect to the pipe 3 can be changed in the circumferential direction 31, and the pipe 3 can be finely cut in the circumferential direction 31. Thereby, the piping 3 can be made easier to remove.

  (4) The dust cover 41 is attached to the front side of the rotary blade 12. Thereby, dust and sparks generated when the rotary blade 12 cuts the pipe 3 can be received by the dust cover 41 and can be prevented from scattering. Further, the dust cover 41 can be used as the axial guide mechanism 14. Further, the dust cover 41 can function as a protective plate for preventing the rotating blade 12 from being inadvertently touched.

  (5) The extension rod 51 can be connected to the front side of the rotary blade 12. Thus, by attaching the extension rod 51 to the front side of the rotary blade 12, the rotary blade 12 can be inserted into the deep portion of the pipe 3 and the deep portion can be cut along the axial direction 11. Further, by attaching the mark 56 to the extension rod 51, the cutting position in the deep part of the pipe 3 can be accurately grasped.

  (6) In the pipe removing method of this embodiment, the pipe 3 is cut along the axial direction 11 by using the pipe removing tool 4 described above. Thereby, the piping 3 can be easily removed from the slab 2.

  (7) Prior to cutting the pipe 3, the release agent 71 or the weakening agent 72 is infiltrated into the interface between the slab 2 and the pipe 3 so that the interface is peeled or weakened. As a result, the pipe 3 can be easily removed without holding the slab 2 and without using a large-scale device. In addition, the generation of noise, vibration, dust and the like can be greatly reduced. The penetration of the release agent 71 or the weakening agent 72 may be allowed to stand for a certain time (for example, about one day) after the release agent 71 or the weakening agent 72 is injected into the interface. By peeling or embrittlement of the interface, it is possible to remove the pipe 3 relatively easily even when an uneven portion or the like exists in a portion of the pipe 3 in the slab 2.

  The pipe 3 can be removed from the slab 2 after peeling or weakening of the interface by applying a physical force such as twisting the pipe 3 using a tool such as a pipe wrench. However, the pipe 3 can be removed more easily by cutting the pipe 3 along the axial direction 11.

  As mentioned above, although embodiment of this invention has been explained in full detail with drawing, embodiment is only an illustration of this invention. Therefore, the present invention is not limited only to the configuration of the embodiment, and it goes without saying that design changes and the like within a scope not departing from the gist of the present invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. In addition, in the case where a plurality of examples and modifications are disclosed in the embodiment as those of the present invention, possible combinations of combinations extending over these are included even if not specifically described. Of course. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in the range and accuracy recognized by common sense.

DESCRIPTION OF SYMBOLS 2 Slab 2a Through-hole part 2b Mortar 3 Piping 4 Piping removal tool 11 Axial direction 12 Rotary blade 13 Rotation drive part 14 Axial direction guide mechanism 21 Radial direction position adjustment mechanism 22 Radial direction 31 Circumferential direction 32 Circumferential cutting position change mechanism 41 Dustproof Cover 51 Extension rod 71 Stripping agent 72 Weakening agent

Claims (7)

A pipe removal tool for removing a pipe embedded in a slab without penetrating the slab,
A rotary blade having a diameter equivalent to the outer diameter of the pipe, or having an effective cutting radius equal to or greater than the thickness of the pipe, and capable of cutting the pipe along the axial direction;
A rotation drive unit that rotationally drives the rotary blade;
A pipe removal tool comprising: an axial direction guide mechanism for moving the rotary blade inserted into the pipe along the axial direction of the pipe. The pipe removal tool according to claim 1,
A pipe removing tool, wherein a rotary blade having an effective cutting radius equal to or greater than a thickness of the pipe is attached so as to be position adjustable in the radial direction of the pipe via a radial position adjusting mechanism. The pipe removal tool according to claim 1 or 2,
The pipe removing tool, wherein the axial direction guide mechanism includes a circumferential cutting position changing mechanism capable of changing a cutting position of the rotary blade with respect to a circumferential direction of the pipe. It is a piping removal tool of any one of Claims 1 thru | or 3, Comprising:
A pipe removing tool, wherein a dustproof cover is attached to a portion closer to the front than the rotary blade. It is a piping removal tool of any one of Claims 1 thru | or 4, Comprising:
A pipe removing tool, characterized in that a rod mounting portion capable of connecting an extension rod capable of inserting the rotary blade into a deep portion of the pipe is provided in a portion on the front side of the rotary blade. A pipe removal method that removes pipes embedded in a slab without penetrating the slab,
A pipe removing method characterized by cutting a pipe along an axial direction and removing a cut piece of the pipe from the slab. Infiltrate the interface between the slab and the pipe with a release agent or a weakening agent to release or weaken the interface,
The pipe removing method according to claim 6, wherein after the interface is peeled or weakened, the pipe is cut along the axial direction and removed from the slab.