JP2016215325A - Pipe cut and removal method and cutter used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To nicely and inexpensively coat and treat a mark of piping after cutting and removing a protruded pipe part side while suppressing the breakage of a cut blade part and the lowering of cut work efficiency by applying rational cut and removal treatment to a protruded pipe part which protrudes to a surface of a pipe arrangement part.SOLUTION: In a pipe cut and removal method which cuts and removes a protruded pipe part side of piping 1 which is protruded from a surface Fa of a pipe arrangement part F, the protruded pipe part side of the piping 1 is cut and removed up to a set internal position by a cut blade part 4 of a cutter C which is rotationally driven by using the cutter C which is arranged at an outside diameter having a cut blade part 4 which cuts an end face 1a of the piping 1, and can cut-progress up to the set internal position which intrudes into the inside rather than the surface Fa of the pipe arrangement part F, and a filler 13 is filled into a recess 12a of a piping hole 12 which is formed at the surface Fa side of the pipe arrangement F so as to be exposed accompanied by the cut and removal of the protruded pipe part side while being flush or substantially flush with the surface Fa of the pipe arrangement part F.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a pipe cutting and removing method for cutting and removing an unnecessary protruding pipe part side of a pipe projecting from a surface of a pipe arrangement part such as a floor surface or a wall surface, and a cutter used therefor.

  In the conventional pipe cutting and removing method, as shown in Patent Document 1, a shaft body that can be mounted on a rotary drive means such as an electric drill has an outer diameter larger than the outer diameter of the pipe, and the inner diameter is the pipe. A cutting blade portion configured to be smaller than the inner diameter of the tube and a guide body that enters the pipe and guides the cutting blade portion in a concentric or substantially concentric state along the tube axis direction. Use a cutter.

  By inserting the cutter guide body into the protruding tube portion of the pipe and guiding the cutting blade portion in a concentric or substantially concentric state along the tube axis direction, the cutting blade portion that is rotationally driven The end face of the protruding pipe part to be removed is removed by cutting.

Japanese Patent Laid-Open No. 08-001401

In the conventional tube cutting and removing method, if the cutting blade portion of the cutter contacts the surface of the tube placement portion, the cutting blade portion may be damaged. It is set at a position near the front of the surface of the installation part.
Therefore, even at the end of the cutting and removing operation, a part of the protruding pipe portion of the pipe is left in a state of protruding from the surface of the pipe arrangement portion. However, a specially shaped coating treatment material such as a cover is required, and the coating treatment material protrudes to the surface side larger than the remaining pipe portion of the piping, so that the coating treatment cost is increased, but the piping trace Appearance design nature was falling.
In particular, when the surface of the pipe arrangement portion is a floor surface of a floor slab, there is a potential danger that a pedestrian will crawl on the covering treatment material protruding in a step shape from the floor surface.

  In view of this situation, the main problem of the present invention is to prevent the cutting blade portion from being damaged or cutting work efficiency from being lowered by a rational cutting removal process for the protruding tube portion protruding from the surface of the tube arrangement portion. The object is to provide a pipe cutting and removing method and a cutter used therefor, which can coat the pipe trace after cutting and removing on the pipe part side in a good and inexpensive manner.

A first characteristic configuration according to the present invention is a pipe cutting and removing method for cutting and removing a protruding pipe part side of a pipe protruding from a surface of a pipe disposing part,
Using a cutter provided with a cutting blade portion configured to cut an end face of the pipe and to have an outer diameter capable of proceeding to a set internal position that enters the inner side from the surface of the pipe arrangement portion. The projecting pipe part side of the pipe is cut and removed to the set internal position by the cutting blade part of the cutter that is rotationally driven,
Filler material is flush or substantially flush with the surface of the pipe arrangement part in the recess of the pipe hole exposed on the surface side of the pipe arrangement part as the protruding pipe part is cut and removed. It is in the point filled.

According to the above configuration, the cutting blade portion of the cutter that is driven to rotate is applied to the end surface of the protruding tube portion of the pipe that protrudes from the surface of the tube arrangement portion, and the cutting blade portion is placed in this state. Cutting is carried out by feeding to a set internal position that enters the inner side from the surface of the pipe arrangement portion along the pipe axis of the pipe.
At this time, the cutting blade portion of the cutter itself is configured to have an outer diameter that cuts the end face of the pipe and allows the cutting to proceed to a set internal position that enters the inner side of the surface of the pipe arrangement portion. Further, it is possible to suppress cutting of the inner peripheral surface of the pipe hole on the side of the pipe arrangement portion that is in contact with the outer peripheral surface of the pipe.
In addition, since the protruding tube portion side is cut and removed to the set internal position that has entered the inner side from the surface of the pipe arrangement portion, the concave portion of the pipe hole is exposed and formed on the surface side of the pipe arrangement portion. By filling the recess in the pipe hole with the filler in a state that is flush with or substantially flush with the surface of the pipe placement portion, the pipe trace can be processed in a good manner.

  Therefore, in the cutting process from the surface of the pipe arrangement part to the set internal position, the cutting blade part may be damaged due to unnecessary cutting on the inner peripheral surface of the pipe hole on the pipe arrangement part side in contact with the outer peripheral surface of the pipe. The piping trace after cutting and removing on the protruding pipe portion side can be coated with a simple filler at a low cost while suppressing a reduction in cutting work efficiency.

  According to a second characteristic configuration of the present invention, the cutter is provided with a guide body that enters the pipe and guides the cutting blade portion in a concentric or substantially concentric state along the tube axis direction. In the cutting process from the surface of the pipe disposition part to the set internal position, the cutting blade part is in contact with the outer peripheral surface of the pipe, and the pipe disposition hole on the pipe disposition part side is moved by the guide action of the guide body. It is in the point which advances cutting in the state which does not cut the inner peripheral surface.

According to the above configuration, when cutting and removing the protruding pipe part side of the pipe projecting from the surface of the pipe arrangement part, the cutting blade part enters the pipe and is concentric or along the pipe axis direction. Since a cutter provided with a guide body that guides the guide in a substantially concentric state is used, in the cutting process from the surface of the pipe arrangement portion to the set internal position, the guide body touches the outer peripheral surface of the pipe by the guide action. The cutting blade portion can be advanced by cutting without cutting the inner peripheral surface of the pipe hole on the tube arrangement portion side.
Therefore, in the cutting process from the surface of the pipe arrangement part to the set internal position, the cutting blade part may be damaged due to unnecessary cutting on the inner peripheral surface of the pipe hole on the pipe arrangement part side in contact with the outer peripheral surface of the pipe. A reduction in cutting work efficiency can be avoided.

A third characteristic configuration according to the present invention is a cutter used in the tube cutting and removing method described in the first or second characteristic configuration described above, wherein the cutting blade portion is attached to a shaft body that can be attached to a rotation driving means. And a guide body that enters the pipe and guides the cutting blade portion in a concentric or substantially concentric state along the tube axis direction,
The shaft body is provided with an intrusion prevention body for preventing cutting waste cut by the cutting blade portion from entering between the outer surface of the guide body and the inner peripheral surface of the pipe. .

According to the above configuration, when the protruding pipe part side of the pipe projecting from the surface of the pipe arrangement part is cut and removed by the cutting blade part of the cutter, the pipe is guided by the progress guide action of the guide body entering the pipe. Unnecessary cutting with respect to the inner peripheral surface of the pipe hole on the side of the pipe disposing portion that is in contact with the outer peripheral surface can be suppressed.
In addition, the intrusion prevention body provided on the shaft body can prevent the cutting waste generated by cutting at the cutting blade portion from entering between the outer surface of the guide body and the inner peripheral surface of the pipe. Further, it is possible to suppress an increase in the pull-out resistance of the cutter due to the invading cutting waste being caught between the outer surface of the guide body and the inner peripheral surface of the pipe.
Therefore, the cutter can be properly pulled out from the pipe while the outer diameter of the guide body of the cutter is made as close as possible to the inner diameter of the pipe to improve the accuracy of the traveling guide action.

  According to a fourth characteristic configuration of the present invention, in the cutter according to the third characteristic configuration described above, the relative movement in the diametric direction between the shaft body and the intrusion prevention body is within a certain range. This is because of the flexibility to allow.

When cutting and removing the protruding pipe part side of the pipe projecting from the surface of the pipe arrangement part with the cutting blade part of the cutter, if the outer diameter of the cutting blade part is slightly smaller than the outer diameter of the pipe, Or, when the axial center of the cutting blade is slightly displaced in the diameter direction with respect to the axial center of the pipe, an uncut portion such as a thin skin remains on the outer peripheral surface side or inner peripheral surface side of the protruding tube portion May occur.
At this time, a method of cutting and removing the uncut portion by tilting the shaft core of the shaft body relative to the pipe shaft core of the piping and shaking the cutting blade portion in the diameter direction has been adopted. Is provided integrally with the shaft body, the intrusion prevention body also tilts with the tilting operation of the shaft body, resulting in variations in the intrusion prevention function in the circumferential direction of the intrusion prevention body. On the side away from the inner peripheral surface, cutting waste may enter through the generated gap.
However, in the above-described characteristic configuration, even if the shaft body is tilted, the intrusion prevention body can be maintained in the intrusion prevention posture by the flexibility provided between the shaft body and the intrusion prevention body. It is possible to satisfactorily suppress the cutting waste from being caught between the outer surface of the guide body and the inner peripheral surface of the pipe.

  According to a fifth characteristic configuration of the present invention, in the cutter according to the third or fourth characteristic configuration described above, the intrusion prevention body has an outer diameter larger than an inner diameter of the pipe, and enters the pipe. It is in the point comprised from the flexible disc which can be bent and deformed to the back side of the advancing direction with the approach.

  According to the above configuration, since the intrusion prevention body is composed of a flexible disk having a diameter larger than the inner diameter of the pipe, the flexible disk bends backward in the traveling direction as it enters the pipe. When deformed, the outer peripheral edge of the flexible disk is brought into pressure contact with the inner peripheral surface of the pipe, and the effect of preventing cutting chips from entering can be enhanced.

  According to a sixth characteristic configuration of the present invention, in the cutter according to the fifth characteristic configuration described above, a portion of the shaft body on the rear side in the traveling direction of the intrusion prevention body is smaller than the outer diameter of the guide body. A deformation restricting portion is provided which has an outer diameter and abuts against a side surface on the rear side in the traveling direction of the intrusion prevention body and restricts the bending deformation range of the intrusion prevention body outside the contact area. .

  According to the above configuration, when the intrusion prevention body is inserted into the pipe, the entire intrusion prevention body is not bent and deformed rearward in the traveling direction, but is provided at the rearward direction portion of the intrusion preventing body in the shaft body. In the non-contact area that does not come into contact with the deformation restricting portion, the intrusion prevention body is allowed to bend and deform backward in the traveling direction, so that the outer peripheral edge of the flexible disk is strongly pressed against the inner peripheral surface of the pipe. It is possible to improve the effect of preventing cutting chips from entering.

  A seventh characteristic configuration according to the present invention is that, in the cutter according to the third to sixth characteristic configurations described above, the intrusion prevention body and the shaft body are configured to be relatively rotatable.

  According to the said structure, while being able to reduce rotational resistance compared with the case where an intrusion prevention body rotates integrally with a shaft body, an intrusion prevention body can be maintained in an intrusion prevention posture.

Side view of half section showing cutter of the present invention Front view taken along line II-II in FIG. Rear view taken along line III-III in FIG. Exploded sectional view of the cutter Enlarged view of the cutting edge of the cutter Sectional view when inserting guide body in tube cutting removal method Sectional view at the start of cutting in the tube cutting and removal method Sectional view at the end of cutting in the pipe cutting and removal method Sectional view when filling process is completed in the tube cutting and removal method

[First Embodiment]
1 to 5 are made of metal such as a gas pipe or a water pipe projecting from a floor surface (an example of a surface) Fa of a concrete floor slab F which is an example of a pipe arrangement portion (for example, made of steel pipe). The cutter C used for the pipe cutting removal method (refer FIGS. 6-9) which cuts and removes the unnecessary protruding pipe part 1A side of the piping 1 of FIG.
As shown in FIGS. 1 to 5, the cutter C has a shaft made of metal (for example, high carbon chromium bearing steel) that can be attached to a drill chuck 2 of a portable electric drill E that is an example of a rotation driving means. The body 3 and the end surface 1a of the pipe 1 are cut along the tube axis direction, and the cutting can proceed to a set internal position L1 (see FIG. 8) that enters the inner side of the floor surface Fa of the floor slab F. A cutting blade 4 configured to have an outer diameter, and metal (for example, made of gunmetal) that enters the pipe 1 and guides the cutting blade 4 in a concentric or substantially concentric state along the tube axis direction. ) Guide body 5.
Further, the cutter C prevents the cutting waste cut by the cutting blade 4 from entering between the outer peripheral surface (outer surface) 5b of the guide body 5 and the inner peripheral surface 1b of the pipe 1. 6 is provided.

The shaft body 3 of the cutter C includes a flat gripped surface 3a that is gripped and fixed to the three chuck claws 2a of the drill chuck 2 shown in FIG. 6 in a relatively non-rotatable manner, and the cutting blade portion 4 is replaceable. The large-diameter shaft portion 3A that is externally fitted and fixed, and the small-diameter shaft portion 3B that is externally fitted so as to be relatively rotatable with the guide body 5 and the intrusion prevention body 6 being replaceable.
As shown in FIGS. 1, 3, and 4, the large-diameter shaft portion 3 </ b> A of the shaft body 3 is provided at one or a plurality of locations in the circumferential direction of the cutting blade portion 4 (in the embodiment, two locations in the circumferential direction). An engagement recess 3b is formed in which the tip of a set screw 7 that is screwed from the radially outer side to the formed screw hole 4a is engaged.
The set screw 7 screwed into the screw hole 4 a is configured to have such a dimension that the end surface on the radially outer side thereof does not protrude from the outer peripheral surface of the cutting blade portion 4.

As shown in FIGS. 1 and 4, a plurality of cutting blade portions 4 of the cutter C are provided on a cylindrical base portion 4 </ b> A having a screw hole 4 a at a predetermined pitch in the circumferential direction (8 in the present embodiment). A cylindrical blade portion 4B on which a plurality of cutting blades 4b are formed is formed so as to project integrally on the front side.
As shown in FIGS. 4 and 5, each of the cylindrical blades 4 </ b> B adjacent to each other in the circumferential direction in the plurality of cutting blades 4 b is cut from the tip toward the base portion 4 </ b> A, and the cylindrical blade 4 </ b> B The cutting waste discharge groove 4c penetrating in the radial direction is formed, and the groove forming wall surfaces 4ca and 4cb facing each other in the cutting rotation direction of each cutting waste discharge groove 4c are inclined to the rear side in the cutting rotation direction toward the base portion 4A side. It is formed on an inclined surface.
Among them, between the steeply inclined groove-forming wall surface 4ca on the front side in the cutting rotation direction continuous to the cutting edge 4ba of each cutting blade 4b and the first plane (vertical surface in FIG. 5) P1 along the axial direction of the shaft body 3 Is formed with a rake angle θ.
Further, a receding wall surface 4d is continuously formed between the cutting edge 4ba of each cutting blade 4b and the tip edge of the gently inclined groove forming wall surface 4cb on the rear side in the cutting rotation direction, and the receding wall surface 4d and the shaft core of the shaft body 3 are formed. A clearance angle β is formed between the second plane (horizontal plane in FIG. 5) P2 orthogonal to the horizontal plane P2.

The outer diameter D1 of the outer peripheral surface of the cylindrical blade portion 4B of the cutting blade portion 4 and the entire area from the blade edge 4ba to the rear end surface of the base portion 4A is set within the same range as the outer diameter D8 of the pipe 1 or within a cuttable range. The outer diameter is reduced by the set dimension.
Therefore, as shown in FIG. 8, the length region from the cutting edge 4ba of the cutting blade portion 4 to the front end surface of the drill chuck 2 of the electric drill E that can come into contact with the floor surface Fa of the floor slab F is defined as a cutting advanceable region A1. Become.
The inner diameter D2 of the inner peripheral surface of the cylindrical blade portion 4B of the cutting blade portion 4 is configured to be the same as the inner diameter D9 of the pipe 1 or smaller than the set dimension.

  2 indicates the minimum blade width in the circumferential direction of the receding wall surface 4d of the cutting blade 4b, and W2 indicates the maximum opening width in the circumferential direction of the cutting waste discharge groove 4c.

As shown in FIGS. 1 to 4, the guide body 5 of the cutter C includes a through hole 5 a for mounting on the small-diameter shaft portion 3 </ b> B of the shaft body 3 at the center, and is parallel to the axis of the shaft body 3. It is comprised in the cylindrical body provided with the straight outer peripheral surface 5b.
At the outer peripheral edge of the front end of the guide body 5, the shaft core 3 is connected to the inner periphery of the end surface 1 a (see FIG. 6) of the pipe 1 when inserted into the pipe 1. A tapered insertion guide surface 5c that matches the core is formed.

Further, the guide body 5 that is externally fitted to the small-diameter shaft portion 3B of the shaft body 3 is moved out to the tip side as shown in FIGS. 1, 2, and 4, as shown in FIG. Contact is prevented by a first washer 9 that contacts a spring pin 8 as a retaining means provided in the insertion hole 3c.
The movement of the guide body 5 toward the base end side is performed by the two second washers 10 having the same shape and the intrusion prevention body 6 that are externally disposed between the guide body 5 and the stepped surface 3d of the shaft body 3. Contact is prevented.

  As shown in FIGS. 4 and 6, the outer diameter D3 of the linear outer peripheral surface 5b of the guide body 5 is the same as the inner diameter D9 of the pipe 1 or the set dimension (the same as the set dimension of the outer diameter D1 of the cutting blade portion 4). ) Is configured to have a smaller outer diameter, and the cutting blade portion 4 is concentric along the tube axis direction of the pipe 1 by sliding contact between the outer peripheral surface 5b of the guide body 5 and the inner peripheral surface 1b of the pipe 1. Or, guide the progress in a substantially concentric state.

As shown in FIGS. 1, 2, 4, and 7, the intrusion prevention body 6 has an outer diameter D <b> 4 that is larger than the inner diameter D <b> 9 of the pipe 1, and proceeds along with the entry into the pipe 1. It is composed of a rubber flexible disk 6A that can be bent and deformed rearward in the direction.
In a state where the flexible disk 6A has entered the pipe 1, the small diameter of the shaft body 3 is deformed between the guide body 5 and the cutting blade portion 4 by the flexible disk 6A which is bent and deformed rearward in the traveling direction. By closing the annular space between the outer peripheral surface of the shaft portion 3B and the inner peripheral surface 1b of the pipe 1, the cutting blade portion 4 is formed on the concave rear side surface of the flexible disk 6A that is bent and deformed rearward in the traveling direction. It is possible to receive the cutting scraps cut by.

  When the flexible disk 6A is bent and deformed rearward in the traveling direction as it enters the pipe 1, the outer peripheral surface of the flexible disk 6A is pressed against the inner peripheral surface 1b of the pipe 1, and in particular, Since the outer peripheral edge of the front side surface of the flexible disc 6A is strongly pressed against the inner peripheral surface 1b of the pipe 1, it is possible to enhance the effect of preventing the entry of cutting waste.

  Further, the inner diameter D5 of the through hole 6a of the flexible disk 6A is configured to be larger than the outer diameter D6 of the small diameter shaft portion 3B of the shaft body 3, as shown in FIGS. Between the inner peripheral surface of the through-hole 6a of the disk 6A and the outer peripheral surface of the small diameter shaft portion 3B of the shaft body 3, the flexible disk 6A and the small diameter shaft portion 3B of the shaft body 3 in the diameter direction. A gap is formed as an accommodation S that allows relative movement within a certain range.

  When the protruding pipe portion 1A of the pipe 1 projecting from the floor surface Fa of the floor slab F is cut and removed by the cutting blade portion 4 of the cutter C, the cutting blade portion 4 is connected to the pipe 1 in most of the cutting removal process. In the case where an uncut portion such as a thin skin on the outer peripheral side of the projecting tube portion 1A is generated, the tube shaft core of the pipe 1 is operated. On the other hand, a measure is taken to cut and remove the uncut portion by tilting the shaft core of the shaft body 3 and shaking the cutting blade portion 4 in the diameter direction.

  At this time, in the case where the flexible disk 6A is provided integrally with the shaft body 3, the flexible disk 6A tilts together with the tilting operation of the shaft body 3, so that the flexible disk 6A There is a variation in the intrusion prevention function in the circumferential direction of the plate 6A. In particular, cutting waste may enter through the generated gap on the side away from the inner peripheral surface 1b of the pipe 1.

  However, in the above-described configuration, even when the shaft body 3 is tilted, the flexible disk 6A is maintained in the intrusion prevention posture by the interchange S provided between the shaft body 3 and the flexible disk 6A. Therefore, it is possible to satisfactorily prevent the entering cutting waste from being caught between the outer peripheral surface 5b of the guide body 5 and the inner peripheral surface 1b of the pipe 1.

  Each of the first washer 9 and both the second washers 10 is configured to have an outer diameter D10 that is smaller than the outer diameter D3 of the guide body 5. Among them, one second washer 10 disposed at the rear side portion of the shaft 3 in the traveling direction of the flexible disk 6 </ b> A, that is, one second washer 10 disposed in contact with the stepped surface 3 d of the shaft 3. Is configured to be a deformation restricting portion that abuts against the rear side surface of the flexible disk 6A and restricts the bending deformation range of the flexible disk 6A toward the rear side in the traveling direction to a non-contact area.

  When the flexible disk 6A enters the pipe 1, the entire flexible disk 6A does not bend and deform backward in the traveling direction, but the traveling direction of the flexible disk 6A in the shaft body 3 Since the flexible disk 6A is allowed to bend in the rearward direction in the advancing direction in the non-contact area where it does not contact one of the second washers 10 disposed in the rear part, the outer periphery of the flexible disk 6A The outer peripheral edge of the surface, in particular, the front surface side can be strongly pressed against the inner peripheral surface 1b of the pipe 1, and the effect of preventing cutting chips from entering can be further enhanced.

  The inner diameter D7 of the through hole 10a of each second washer 10 is formed to have the same diameter as or slightly larger than the outer diameter D6 of the small diameter shaft portion 3B of the shaft body 3, as shown in FIGS. Therefore, the interchange S is achieved between the inner peripheral surface of the through hole 10a of the second washer 10 disposed in contact with the stepped surface 3d of the shaft body 3 and the outer peripheral surface of the small-diameter shaft portion 3B of the shaft body 3. It is possible to suppress cutting chips from entering the inside.

Next, a tube cutting and removing method using the cutter C configured as described above will be described.
[1] Since the cutter C described above cuts the end surface 1a of the protruding pipe portion 1A of the pipe 1 along the tube axis direction, as shown in FIG. 6, the protruding pipe portion 1A of the pipe 1 to be cut is shown. The protrusion length is preferably as short as possible from the viewpoint of work efficiency.
Therefore, as a preparatory step of the pipe cutting and removing method, an existing pipe cutting device (not shown) is provided at a position as close as possible to the floor surface Fa of the floor slab F with respect to the protruding pipe portion 1A of the pipe 1 having a different protruding length for each construction site. ).
In FIG. 6, a state where the protruding pipe portion 1 </ b> A of the pipe 1 has already been cut and removed from the floor surface Fa of the floor slab F at a set height position (for example, 10 mm in the embodiment) H by an existing pipe cutting device. Show.

[2] As shown in FIG. 6, the shaft body 3 of the cutter C is inserted into the drill chuck 2 of the electric drill E, and the held surface 3 a formed on the large diameter shaft portion 3 </ b> A of the shaft body 3 is inserted into the drill chuck 2. The chuck claw 2a is held and fixed in a state where relative rotation is impossible.
The guide body 5 of the cutter C mounted on the drill chuck 2 of the electric drill E is inserted from the end opening of the protruding pipe portion 1A of the pipe 1.
At this time, the outer peripheral surface 5b of the guide body 5 is formed in a linear peripheral surface parallel to the axis of the shaft body 3, and has an outer diameter that is the same as or smaller than the inner diameter D9 of the pipe 1 by a set dimension. Therefore, the cutting blade portion 4 advances in a concentric or substantially concentric state along the tube axis direction of the pipe 1 by sliding contact between the outer peripheral surface 5b of the guide body 5 and the inner peripheral surface 1b of the pipe 1. Guided.

[3] Subsequently, as shown in FIG. 7, the front side second washer 10 abutting on the rear surface of the guide body 5 and the rear side second washer 10 abutting on the stepped surface 3d of the shaft body 3 are provided. When the flexible disk 6A as the intrusion prevention body 6 that is held between the two enters the pipe 1, the second washer on the rear side that also serves as a deformation restricting portion of the flexible disk 6A. An annular non-contact region on the radially outer side that is not in contact with 10 enters the pipe 1 while being bent and deformed rearward in the traveling direction.
With this bending deformation, the outer peripheral surface of the flexible disk 6A is pressed against the inner peripheral surface 1b of the pipe 1, and in particular, the outer peripheral edge of the front side surface of the flexible disk 6A is in contact with the inner peripheral surface 1b of the pipe 1. Because of the strong pressure contact, the annular space between the outer peripheral surface of the small diameter shaft portion 3B of the shaft body 3 and the inner peripheral surface 1b of the pipe 1 is closed.

[4] Further, as shown in FIG. 7, the cutter C is fed to a position where the cutting edge 4ba of each cutting blade 4b of the cutting blade 4 abuts the end surface 1a of the protruding tube portion 1A of the pipe 1, and is driven in this state. The end surface 1a of the projecting tube portion 1A of the pipe 1 is cut along the tube axis by each cutting blade 4b of the rotating cutting blade portion 4, and as shown in FIG. 8, than the floor surface Fa of the floor slab F. Cutting proceeds to the set internal position L1 entering the inside.

  At this time, as the dimension setting of the cutting blade part 4 of the cutter C used, the outer diameter D1 of the cutting blade part 4 is configured to be the same as the outer diameter D8 of the pipe 1 or smaller than the set dimension, and The inner diameter D2 of the cutting advanceable region A1 on the inner peripheral surface of the cylindrical blade portion 4B of the cutting blade portion 4 is configured to be the same as or smaller than the inner diameter D9 of the pipe 1 by a set dimension.

  Therefore, in the external cutting process from the end face 1a of the protruding pipe portion 1A of the pipe 1 at the set height position H to the floor face Fa of the floor slab F, the outer peripheral face 5b of the guide 5 and the inner peripheral face 1b of the pipe 1 are used. The cutting blade portion 4 can be guided along the tube axis direction of the pipe 1 in a concentric or substantially concentric state, so that all of the protruding tube portion 1A can be removed by cutting. .

  However, when the outer diameter D1 of the cutting blade part 4 is slightly smaller than the outer diameter D8 of the pipe 1, or the axial center of the cutting blade part 4 is slightly positioned in the diameter direction with respect to the axial core of the pipe 1. In the case of deviation, an uncut portion such as a thin skin remaining on the outer peripheral surface side or the inner peripheral surface side of the protruding tube portion 1A may occur. Since this state can be visually confirmed, the entire electric drill E including the cutter C is swung on the side where the shaft core of the shaft body 3 is tilted with respect to the tube shaft core of the pipe 1 to perform cutting. By shaking the blade portion 4 in the diametrical direction within a range that is flush with or slightly beyond the outer peripheral surface 1c of the pipe 1, the uncut portion can be removed by cutting.

  Furthermore, also in the internal cutting process from the floor surface Fa of the floor slab F to the set internal position L1, the cutting blade portion 4 is connected to the pipe 1 by sliding contact between the outer peripheral surface 5b of the guide 5 and the inner peripheral surface 1b of the pipe 1. Therefore, the cutting blade portion 4 can be guided in a concentric or substantially concentric state along the pipe axis direction, so that the inner peripheral surface of the pipe hole 12 on the floor slab F side in contact with the outer peripheral surface 1c of the pipe 1 is provided. The cutting can be progressed without cutting or suppressing.

  Even in this internal cutting process, an uncut portion such as a thin skin may remain on the outer peripheral surface side or the inner peripheral surface side of the protruding tube portion 1A. This state is caused through the opening of the piping hole 12 of the floor slab F. Since it can be visually confirmed, the electric drill E including the cutter C is swung on the side where the shaft core of the shaft body 3 is tilted with respect to the tube core of the pipe 1 each time, and the cutting blade portion 4 is moved. By shaking in the diameter direction within a range that is flush with or slightly beyond the outer peripheral surface 1c of the pipe 1, the uncut portion can be removed by cutting.

  In the above-described external cutting process and internal cutting process, even if the shaft body 3 is tilted, the flexible disk 6A is moved by the interchange S provided between the shaft body 3 and the flexible disk 6A. Since the predetermined invasion preventing posture can be maintained, it is possible to satisfactorily suppress the invading cutting waste from being caught between the outer peripheral surface 5 b of the guide body 5 and the inner peripheral surface 1 b of the pipe 1.

In FIG. 8, the cutting progressable area A1 is from the cutting edge 4ba of the cutting blade 4 which is also the set internal position L1 to the front end face of the drill chuck 2 of the electric drill E, and the floor surface of the floor slab F from the set internal position L1. Up to Fa is the actual cutting progress region A2.
Further, the cutting progress possible region A1 can be set to an arbitrary length based on cutting work conditions and the like.

[5] Next, as shown in FIG. 9, the cutter C is pulled out from the pipe 1, and the concave portion of the pipe hole 12 that is exposed and formed on the floor Fa side of the floor slab F along with the cutting removal on the protruding pipe 1 </ b> A side. 12a is filled with the filler 13 in a state of being flush with or substantially flush with the floor surface Fa of the floor slab F.
The filling material 13 includes a tube hole closing member 13A such as a sponge that closes the tube hole of the pipe 1 that opens to the bottom surface of the recess 12a of the pipe hole 12, and the tube hole of the pipe 1 is closed by the tube hole closing member 13A. It is comprised from the mortar 13B with which it fills with the floor surface Fa and the same or substantially flush state with respect to the recessed part 12a of the piping hole 12 which is.

〔Example〕
In the cutter C configured as described above, for example, in a gas pipe made of SGP (carbon steel pipe for piping) which is an example of the piping 1, when the nominal diameter is 3/4 (20A), the outer diameter D8 of the gas piping Is 27.2 mm and the inner diameter D9 is 21.6 mm. Therefore, the outer diameter D1 of the cutting blade portion 4 is 27.2 (+0, −0.5) mm, the inner diameter D2 is 19.6 mm, and the outer diameter of the guide body 5. D3 is set to 21.6 (+0, −0.5) mm, respectively.

  When the nominal diameter of the gas pipe made of SGP (carbon steel pipe for piping) is 1 (25A), the outer diameter D8 of the gas pipe is 34.0 mm and the inner diameter D9 is 27.6 mm. The outer diameter D1 of the guide body 5 is set to 34.0 (+0, −0.5) mm, the inner diameter D2 is set to 23.6 mm, and the outer diameter D3 of the guide body 5 is set to 27.6 (+0, −0.5) mm. Yes.

  When the nominal diameter of the gas pipe made of SGP (carbon steel pipe for piping) is 1/4 (32A), the outer diameter D8 of the gas pipe is 42.7 mm and the inner diameter D9 is 35.7 mm. The outer diameter D1 of the cutting blade 4 is 42.7 (+0, −0.5) mm, the inner diameter D2 is 30.7 mm, and the outer diameter D3 of the guide body 5 is 35.7 (+0, −0.5) mm. Each is set.

  Further, since the intrusion prevention body 6 is also configured with a plurality of types of outer diameters corresponding to the nominal diameter of the pipe 1, a cutting blade portion corresponding to the nominal diameter of the pipe 1 to be removed by pipe cutting with respect to the shaft body 3. 4. Replace with guide body 5 and intrusion prevention body 6 for use.

[Other Embodiments]
(1) In the above-described embodiment, the pipe cutting and removing method for cutting and removing the protruding pipe portion 1A side of the pipe 1 protruding from the floor surface Fa of the floor slab F has been described. The present invention can also be applied to the case where the protruding tube portion 1A side of the pipe 1 protruding from the surface is cut and removed.

(2) In the above-described embodiment, the intrusion prevention body 6 is composed of the rubber flexible disk 6A that can be bent and deformed rearward in the traveling direction as it enters the pipe 1. The disc 6A may be made of another flexible material such as a nonwoven fabric (felt).
Further, the intrusion prevention body 6 is made of rubber or non-woven fabric that is in sliding contact with the inner peripheral surface 1b of the pipe 1 on the outer peripheral portion of a hard disk made of metal or resin having an outer diameter smaller than the inner diameter D9 of the pipe 1. A flexible sliding contact body such as the above may be attached.

  (3) In the above-described embodiment, the inner diameter D5 of the through hole 6a of the flexible disk 6A is configured to be larger than the outer diameter D6 of the small diameter shaft portion 3B of the shaft body 3, so that the flexible disk Between the inner peripheral surface of the through hole 6a of 6A and the outer peripheral surface of the small-diameter shaft portion 3B of the shaft body 3, relative movement in the diametrical direction between the flexible disk 6A and the small-diameter shaft portion 3B of the shaft body 3 is performed. Although the gap as the accommodation S allowed within a certain range is formed, it is not limited to this configuration. For example, an elastic ring having a size corresponding to the gap is provided on the inner peripheral surface of the through hole 6a of the flexible disk 6A, and the diameters of the flexible disk 6A and the small diameter shaft portion 3B of the shaft body 3 are provided. You may comprise the accommodation S which accept | permits the relative movement in a direction within a fixed range.

  (4) In the above-described embodiment, the guide body 5 that enters the pipe 1 and guides the cutting blade portion 4 in a concentric or substantially concentric state along the tube axis direction is made of metal such as gun metal. However, you may comprise from other materials, such as hard resin.

  (5) In the above-described embodiment, the portable electric drill E has been described as an example of the rotation driving unit. However, the present invention is not limited to this. For example, the mounted shaft body 3 is driven to rotate. It may be a rotational drive means having an automatic feed function that mechanically applies a feed force along the tube axis direction in the state.

  (6) In the above-described embodiment, the outer surface of the guide body 5 is formed on the outer peripheral surface continuous in the circumferential direction. However, the outer surface of the guide body 5 may be constituted by a plurality of divided outer surface portions that are intermittent in the circumferential direction. Good.

  (7) In the above-described embodiment, the filler 13 is composed of the tube hole closing member 13A and the mortar 13B. However, the filler 13 is exposed and formed on the floor surface Fa side of the floor slab F. You may comprise from the caps, such as resin with which the recessed part 12a is mounted | worn with the floor surface Fa of the floor slab F in the state of the same or substantially flush surface.

  (8) In the above-described embodiment, the outer diameter D1 of the cutting blade portion 4 is configured to be the same as the outer diameter D8 of the pipe 1 or an outer diameter that is smaller by a set dimension set within a cuttable range. You may comprise a large diameter within the range of the substantially same diameter as the outer diameter D8 of the piping 1. FIG.

DESCRIPTION OF SYMBOLS 1 Piping 1A Projection pipe part 1a End surface 1b Inner peripheral surface 1c Outer peripheral surface 3 Shaft body 4 Cutting blade part 5 Guide body 6 Intrusion prevention body 6A Flexible disk 10 Deformation | regulation control part (2nd washer on the back side)
12 Piping hole 13 Filling material C Cutter D1 Outer diameter D3 Outer diameter D4 Outer diameter D9 Inner diameter E Rotation drive means (electric drill)
F pipe arrangement part (floor slab)
Fa surface (floor surface)
L1 Set internal position S

Claims (7)

A pipe cutting and removing method for cutting and removing the protruding pipe part side of a pipe projecting from the surface of the pipe arranging part,
Using a cutter provided with a cutting blade portion configured to cut an end surface of the pipe and configured to have an outer diameter capable of cutting to a set internal position that has entered the inner side from the surface of the pipe arrangement portion, The projecting tube portion side of the pipe is cut and removed to the set internal position by the cutting blade portion of the cutter that is rotationally driven,
Filler material is flush or substantially flush with the surface of the pipe arrangement part in the recess of the pipe hole exposed on the surface side of the pipe arrangement part as the protruding pipe part is cut and removed. Filled tube cutting removal method.   The cutter is provided with a guide body that enters the pipe and advances and guides the cutting blade portion in a concentric or substantially concentric state along the pipe axis direction. In the cutting process from the surface of the pipe arrangement part to the set internal position, the cutting blade part performs cutting without cutting the inner peripheral surface of the pipe hole on the pipe arrangement part side in contact with the outer peripheral surface of the pipe. The tube cutting and removing method according to claim 1, which proceeds. It is a cutter used for the pipe cutting removal method of Claim 1 or 2, Comprising: The shaft body which can be mounted | worn with a rotational drive means is inserted into the said cutting blade part and the said piping, and the said cutting blade part is a pipe axis. A guide body that guides the progress in a concentric or substantially concentric state along the core direction;
The cutter in which the shaft body is provided with an intrusion prevention body for preventing cutting waste cut by the cutting blade portion from entering between the outer surface of the guide body and the inner peripheral surface of the pipe.   The cutter according to claim 3, wherein the shaft body and the intrusion prevention body are provided with a flexibility that allows relative movement of both of them in the diameter direction within a certain range.   The said intrusion prevention body is comprised from the flexible disk which can bend and deform | transform into the advancing direction back side with the outer diameter larger than the internal diameter of the said piping, and the approach into the said piping. The cutter according to 3 or 4.   The shaft body has an outer diameter that is smaller than the outer diameter of the guide body at the rear side portion of the intrusion prevention body, and a deformation range of the intrusion prevention body toward the rear side in the movement direction. The cutter according to claim 5, wherein a deformation restricting portion for restricting is provided. The cutter according to any one of claims 3 to 6, wherein the intrusion prevention body and the shaft body are configured to be relatively rotatable.

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