JP7749529B2 - Cutting device and cutting method - Google Patents

Description

This disclosure relates to a cutting device and a cutting method.

When laying out pipes, cables, etc. across structures that separate adjacent spaces, such as walls and floors that make up a structure (hereinafter referred to as "wall members" as appropriate, as a comprehensive concept), penetrations may be provided in the wall members. For example, in nuclear power plant buildings, fire and water protection in the event of a fire or tsunami is achieved by placing a sleeve in the penetration hole formed in the wall member and providing a sealing member in the gap between the pipes, cables, etc. that pass inside the sleeve. Such sealing members are formed by filling them with, for example, fire-resistant materials or elastic resins such as polyurethane or silicone rubber.

When such sealing materials deteriorate due to the surrounding environment or over time, maintenance is required to maintain their performance. Maintenance is carried out by removing the sealing material and then installing new sealing material. Sealing materials can be removed by volume removal using a drill, or by cutting with a blade such as a cutter knife or chisel. For example, Patent Document 1 discloses a cutting method using a concrete wire saw, in which a looped wire with a diamond tip attached is rotated at high speed to remove concrete, rather than the sealing material.

Japanese Patent Application Publication No. 05-185422

Methods such as volume removal using drills or cutting with blades such as cutter knives or chisels are done manually by workers, which takes a lot of time and is inefficient. Furthermore, the method described in Patent Document 1 above involves cutting relatively large concrete materials, and the equipment required to rotate the wire at high speed requires large scale installations, making it difficult to apply to relatively small objects such as sealing members installed in through holes. Furthermore, the wire is rotated at high speed under tension and comes into contact with the object, generating chips and dust.

At least one embodiment of the present disclosure has been developed in consideration of the above circumstances, and aims to provide a cutting device and cutting method that can efficiently cut a sealing member installed at a penetration part of a structure with minimal burden.

In order to solve the above problems, at least one embodiment of the cutting device of the present disclosure includes:
A cutting device for cutting a seal member provided in a penetration portion formed in a wall member that partitions a first space and a second space adjacent to each other,
a shaft member connected to a rotationally driven output shaft and movable along an axial direction of an insertion member inserted into the through-hole by a rotational force transmitted from the output shaft;
At least one cutting blade attached to a tip end of the shaft member;
Equipped with.

In order to solve the above problems, a cutting method according to at least one embodiment of the present disclosure includes:
a shaft member connected to an output shaft that is driven to rotate;
At least one cutting blade attached to a tip end of the shaft member;
A cutting method for cutting a seal member provided in a penetration portion formed in a wall member that partitions a first space and a second space adjacent to each other, using a cutting device comprising:
The method includes a cutting process in which the shaft member is moved along the axial direction of the insertion member inserted into the through-hole by the rotational force transmitted from the output shaft, thereby cutting the sealing member with the cutting blade.

At least one embodiment of the present disclosure provides a cutting device and cutting method that can efficiently cut a sealing member installed in a penetration portion of a structure with minimal strain.

FIG. 2 is a front view showing the overall configuration of the structure. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 1 is a side view showing a cutting device according to an embodiment together with a structure. FIG. 4 is a cross-sectional view taken along line BB in FIG. 3. FIG. 4 is a view showing the tip portion of FIG. 3 from above. FIG. 4 is an enlarged view of the tip portion of FIG. 3 . This is a modified example of FIG. 1 is a flowchart illustrating a cutting method according to an embodiment. 10 is a schematic diagram showing a cutting range for a sealing member in a cutting operation. FIG. FIG. 1 is a configuration diagram showing an extraction device according to an embodiment. 11 is a flowchart showing an extraction operation using the extraction device of FIG. 10 . FIG. 12 is a process diagram corresponding to FIG. 11 . FIG. 12 is a process diagram corresponding to FIG. 11 . FIG. 12 is a process diagram corresponding to FIG. 11 . 10A and 10B are schematic diagrams showing an extraction operation using an extraction device according to another embodiment. 10A and 10B are schematic diagrams showing an extraction operation using an extraction device according to another embodiment.

Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the configurations described as embodiments or shown in the drawings are not intended to limit the scope of the present invention and are merely illustrative examples.

First, with reference to Figures 1 and 2, we will explain a structure 1 including a sealing member 2 that is the target of cutting by a cutting device according to at least one embodiment of the present disclosure. Figure 1 is a front view showing the overall configuration of the structure 1, and Figure 2 is a cross-sectional view taken along line A-A in Figure 1.

The structure 1 has a wall member 6 with a thickness t. The wall member 6 is configured to separate the adjacent first and second spaces 8 and 9, and a penetration 4 is formed in the wall member 6 for installing a pipe 12 across the first and second spaces 8 and 9. The pipe 12 is an insert member having an internal space 5 through which a fluid can pass. When viewed from the front as shown in Figure 1, the penetration 4 is formed in a substantially circular shape with an inner diameter R2 larger than the outer diameter R1 of the pipe 12. This ensures a gap 14 between the penetration 4 and the pipe 12, and prevents the pipe 12 from directly interfering with the wall member 6 even if thermal expansion displacement due to temperature changes or forced displacement due to earthquakes, etc. occurs. The pipe 12 is arranged concentrically with the penetration 4.

In this embodiment, the structure arranged in the penetration 4 is exemplified as a pipe 12, but other structures such as a cable tray or cable may also be used. Furthermore, the shape of the penetration 4 is not limited to a substantially circular shape and may be any shape.

Because the gap 14 serves as a pathway for flames and smoke in the event of a fire and for flooding due to tsunamis, it is filled with a sealing member 2. In this embodiment, a sleeve 13, concentric with the pipe 12, is positioned on the outer periphery of the gap 14 (i.e., on the wall member 6 side), and the sealing member 2 is provided to fill the space between the pipe 12 and the sleeve 13. The sealing member 2 is firmly adhered to the inner diameter R2 of the penetration 4 and the outer diameter R1 of the pipe 12 to prevent water leakage, and is made of a material flexible enough to follow the displacement of the pipe 12 without restraining it. By tightly filling the gap 14, the first space 8 and the second space 9 are separated from each other. The sealing member 2 is made of, for example, a fireproof material or an elastic resin such as silicone rubber or polyurethane, and provides excellent waterproofing by preventing water from entering through the gap 14. This configuration is advantageous for fire prevention and waterproofing when applied to, for example, nuclear power plant buildings.

When such sealing member 2 deteriorates due to the surrounding environment or over time, maintenance is required to maintain its performance. Maintenance is performed by removing the sealing member 2 and installing a new one. Removal of the sealing member 2 can be done efficiently by cutting the sealing member 2 using the cutting method using the cutting device described below.

Next, we will explain the cutting device 20 used in the cutting operation of the sealing member 2. Figure 3 is a side view showing the cutting device 20 according to one embodiment together with the structure 1, Figure 4 is a cross-sectional view taken along line B-B in Figure 3, Figure 5 is a top view of the tip portion 28 in Figure 3, and Figure 6 is an enlarged view of the tip portion 28 in Figure 3.

The cutting device 20 is a device for cutting the seal member 2 installed in the penetration portion 4, and has a rotational power source 22, a shaft member 24, a fixed member 26, a tip portion 28, and a cutting blade 30.

The rotational power source 22 is capable of outputting rotational force from its output shaft 22a and functions as a power source for the cutting device 20. The rotational power source 22 may be, for example, an electrically powered device that can output rotational force by consuming electrical energy, or may be a manually powered device that can output rotational force by manually driving a handle or other component. In the former case, a power tool such as an electric screwdriver can be used as the rotational power source 22.

The shaft member 24 is a rod-shaped member having a threaded portion 24a with a predetermined pitch on its surface. One end of the shaft member 24 is connected to the output shaft 22a of the rotary power source 22. When the rotary power source 22 is driven, the rotational power output from the output shaft 22a is transmitted to the shaft member 24, allowing the shaft member 24 to rotate together with the output shaft 22a.

The shaft member 24 is fixed to the pipe 12 by a holding portion 27 of the fixing member 26. As shown in Figure 4, the fixing member 26 can be fixed by clamping the pipe 12 from the outside around its entire circumference when a pair of approximately semicircular clamp portions 26a and 26b engage with each other. The pair of clamp portions 26a and 26b are positioned above and below the pipe 12, and are fixed to the pipe 12 by having both ends of each clamp portion tightened together with bolts 26c and nuts 26d.

The retaining portion 27 is provided so as to protrude radially outward from one of the clamping portions (clamping portion 26b in this embodiment, but clamping portion 26a may also be used) of the fixing member 26. A groove (not shown) corresponding to the threaded portion 24a of the shaft member 24 is formed in the retaining portion 27. When rotational power is output from the output shaft 22a of the rotational power source 22 as described above, the shaft member 24 rotates, and the threaded portion 24a formed on the surface of the shaft member 24 engages with the grooved portion of the retaining portion 27 of the fixing member 26, allowing the shaft member 24 to move in the axial direction (at this time, the rotational power source 22 and the tip end 28 connected to the shaft member 24 also move in the axial direction together with the shaft member 24).

Such a retaining portion 27 can be configured as a triangular screw, or more preferably, as a trapezoidal screw, which has excellent structural durability. In this embodiment, the retaining portion 27 uses a screw structure to move the shaft member 24 in the axial direction, but other mechanisms (e.g., a cylinder mechanism) may be used instead.

A tip portion 28 is engaged with the other end of the shaft member 24. The tip portion 28 has at least one cutting blade 30. The cutting blade 30 is fixed at a predetermined angle to a frame 28a of the tip portion 28. At least one of the cutting blades 30 extends along the axial direction, as shown in Figure 3. As a result, when the shaft member 24 moves along the axial direction, the cutting blade 30 cuts through the seal member 2 as if being inserted into the seal member 2 from the tip side.
The cutting blade 30 inserted into the seal member 2 can be pulled out along the axial direction together with the shaft member 24 by reversing the direction of the rotational force.

The tip 28 is also detachable from the shaft member 24. This allows the tip 28 to be replaced with one that has an appropriate cutting blade 30 depending on the cutting position and material of the sealing material 2 to be cut, or if the cutting blade 30 becomes worn, the entire tip 28 can be replaced, making it easy to replace the cutting blade 30 depending on the application and purpose.

The configuration of the tip portion 28 will now be described in detail with reference to Figures 5 and 6. Figure 5 is a schematic diagram showing the tip portion 28 of Figure 3 from above, and Figure 6 is an enlarged view of the vicinity of the tip portion 28 of Figure 5.

The tip portion 28 includes a frame 28a on which at least one cutting blade 30 is provided. The frame 28a is a structural element that forms the basic configuration of the tip portion 28. In this embodiment, the tip portion 28 is provided with multiple cutting blades 30 (first cutting blade 30a and second cutting blade 30b). Figures 5 and 6 show the tip portion 28 attached to the shaft member 24 so that the first cutting blade 30a is positioned along the axial direction of the shaft member 24. In this case, the first cutting blade 30a is usable. However, as mentioned above, the tip portion 28 is detachable from the shaft member 24, and by changing the attachment direction of the tip portion 28 relative to the shaft member 24 by 90 degrees, the second cutting blade 30b can be used instead of the first cutting blade 30a.

The frame 28a has an opening 28b into which the end 24b of the shaft member 24 is inserted. The opening 28b has a larger diameter than the shaft member 24, so that when the shaft member 24 is inserted into the opening 28b, a gap 25 is formed between the shaft member 24 and the opening 28b. The opening 28b is provided on the surface of the frame 28a opposite the cutting blades 30. In this embodiment, the first cutting blade 30a is in a usable state, so the shaft member 24 is inserted into the opening 28b provided on the surface of the frame 28a opposite the first cutting blade 30a.

The shaft member 24 inserted into the opening 28b is locked by a locking member 28c inside the frame body 28a. The locking member 28c is, for example, a double nut, and has a larger diameter than the opening 28b. This prevents the end 24b of the shaft member 24, which is locked by the locking member 28c, from slipping out of the frame body 28a.

In addition, since the frame body 28a is open in the direction of the paper in Figures 5 and 6, the user can remove the locking member 28c through this open area to detach the tip portion 28 from the shaft member 24.

As described above, when the shaft member 24 moves axially toward the seal member 2 due to rotational force, the end 24b of the shaft member 24 abuts against the opposing surface 28e of the frame 28a, pressing the tip portion 28, which has the cutting blade 30, toward the seal member 2. A recess 28d corresponding to the end 24b of the shaft member 24 is formed in the opposing surface 28e, and the end 24b of the shaft member 24 engages with the recess 28d. This ensures that the end 24b of the shaft member 24 is stably fixed in place along the opposing surface 28e without shifting. As a result, the pressing force of the shaft member 24 is efficiently transmitted to the tip portion 28, allowing the cutting blade 30 provided on the tip portion 28 to accurately cut the seal member 2.

In this embodiment, the end 24b is tapered compared to the main body of the shaft member 24. The recesses 28d are provided at positions corresponding to the first cutting blade 30a and the second cutting blade 30b, respectively.

Furthermore, when the cutting blade 30 is to be removed from the seal member 2, the locking member 28c provided on the end 24b of the shaft member 24 prevents it from being pulled out of the opening 28b when the shaft member 24 is moved away from the seal member 2, as described above.

As shown in Figure 5, the cutting blade 30 has an uneven blade surface 31 that runs along the extension direction of the shaft member 24. This effectively prevents the cutting blade 30 from being hindered in its movement due to friction or interference with the surrounding elastic sealing member 2 when the cutting blade 30 moves axially and penetrates the sealing member 2.

The cutting edge shape of the cutting blade 30 may be flat, V-shaped, or a combination of these. The cutting edge may be provided on one side or both sides of the cutting blade 30.

Figure 7 is a modification of Figure 5. In this modification, a heating mechanism 40 is provided for heating the cutting blades 30 (first cutting blade 30a and second cutting blade 30b). The heating mechanism 40 is, for example, a heater that can be heated by power supplied from an external source via a power supply line 40a, and can heat the blade surface of the cutting blade 30. As a result, during cutting, the heated cutting blade 30 can reduce the hardness of the sealing member 2 to be cut (i.e., soften the sealing member 2), allowing the cutting blade 30 to cut the sealing member 2 more accurately.
The cutting blade 30 to be heated can be made of a material with excellent thermal conductivity, such as stainless steel, so that the cutting blade 30 can be heated effectively by the heating mechanism 40 .

In this modified example, the heating mechanism 40 uses electricity to heat the object, but other methods, such as vibration or chemical heating, may also be used.

Next, we will explain the method for cutting the sealing member 2 using the cutting device 20 configured as described above. Figure 8 is a flowchart showing the cutting method according to one embodiment.

First, the cutting device 20 is set up (step S100). The setting up performed in step S100 broadly includes setting the cutting device 20 in an appropriate state for cutting the sealing member 2. Specifically, this includes fixing the cutting device 20 to the pipe 12 using a fixing member, and attaching a tip 28 having a cutting blade 30 suitable for the purpose and application to the cutting device 20.

Next, the cutting blade 30 of the cutting device 20 is aligned (step S101). In step S101, the cutting position is identified in advance for the sealing material 2 to be cut, and the position of the cutting blade 30 is adjusted so that the cutting blade 30 is inserted into that cutting position.

Next, the rotary power source 22 is turned ON (step S102). When the rotary power source 22 is turned ON, a rotational force is output from the output shaft of the rotary power source 22, and the cutting blade 30 provided at the tip 28 of the shaft member 24 advances toward the sealing member 2. While the rotary power source 22 is turned ON, the cutting blade 30 gradually advances toward the sealing member 2, cutting through the sealing member 2.

Next, it is determined whether the cutting operation is complete (step S103). In step S103, this determination is made based on whether the cutting blade 30 has sufficiently penetrated into the sealing material 2 to be cut. For example, since the sealing material 2 has a thickness t, it is determined whether the penetration amount of the cutting blade 30 exceeds the thickness t, and therefore cutting has been completed all the way to the back side of the sealing material 2.

When the cutting operation is completed (step S103: YES), the cutting blade 30 is retracted from the seal member 2 (step S104). In step S104, the rotational power source 22 is rotated in the opposite direction to that in step S102, thereby retracting the cutting blade 30 along the axial direction from the seal member 2 together with the shaft member 24.

Next, it is determined whether the cutting operation on the seal member 2 is complete (step S105). Here, Figure 9 is a schematic diagram showing the cutting range of the seal member 2 during the cutting operation. In this cutting method, the seal member 2 is repeatedly cut using the cutting device 20 along a cutting line L1 that runs circumferentially near the outer surface of the pipe 12 and a cutting line L2 that runs circumferentially near the inner surface of the sleeve 13. In other words, since a single cutting operation can only form a cutting line the width of the cutting blade 30, the cutting operation using the cutting blade 30 must be repeated while changing the cutting position until the cutting lines L1 and L2 for separating the seal member 2 from the pipe 12 and sleeve 13 are completed. In step S105, it is determined whether the cutting operation along these cutting lines L1 and L2 is complete.

If the cutting operation is not complete (step S105: NO), the cutting device 20 is set so that the cutter blade 30 moves to the next cutting position (step S106), and the process returns to step S102, where the cutter operation is repeated at the next cutting position.

Note that Figure 3 and other figures illustrate an example in which the cutting blade 30 is set so that it is positioned closer to the pipe 12 in accordance with the cutting line L1. However, if the cutting blade 30 is to be cut at a position closer to the sleeve 13 in accordance with the cutting line L2, this can be achieved by reattaching the tip 28 to the shaft member 24 so that the orientation of the cutting blade 30 is radially opposite to that shown in Figure 3 and other figures.

When the cutting operation is completed by repeating the push-cutting operation while moving the cutting position in this manner (step S105: YES), the cut sealing member 2 (i.e., the sealing member 2 after the cutting lines L1 and L2 have been formed) is pulled out, completing the removal of the sealing member 2 (step S107).

Next, the removal of the sealing member 2 in step S107 will be described in detail. The removal is an operation for removing the sealing member 2 after it has been cut by the cutting device 20, and may be performed manually by an operator, or may be performed using the removal device 50 described below. Figure 10 is a structural diagram showing the removal device 50 according to one embodiment, Figure 11 is a flowchart showing the removal operation using the removal device 50 of Figure 10, and Figures 12A to 12C are process diagrams corresponding to Figure 11.

As shown in FIG. 10, the extraction device 50 comprises a main body 52 and a movable part 56 connected to the main body 52 via a rotating part 54. The main body 52 is a rod-shaped member that extends substantially linearly in one direction. The rotating part 54 is provided at one end of the main body 52, and the movable part 56 is rotatably connected to the rotating part 54. A wire 58 arranged along the main body 52 is connected to the end 56a of the movable part 56, and by applying an external tensile force to the wire 58, the movable part 56 can rotate around the rotating part 54 as an axis.

The movable range of the movable part 56 is, for example, an angle of the movable part 56 relative to the main body part 52 ranging from 0 to 90 degrees.

In the extraction method using the extraction device 50, as shown in FIG. 12A, a hole 60 is first formed in the sealing member 2 cut by the cutting device 20 using a tool such as a drill (step S200). The hole 60 is formed in a substantially linear shape along the axial direction of the sealing member 2 so as to have a diameter larger than the main body 52 and movable part 56 of the extraction device 50.

Next, the extraction device 50 is inserted into the hole 60 formed in step S200 (step S201). At this time, the extraction device 50 is in a state in which the main body 52 and movable part 56 are substantially linear (i.e., the angle of the movable part 56 relative to the main body 52 is zero degrees). As mentioned above, the hole 60 has a larger diameter than the main body 52 and movable part 56, so the extraction device 50 can be smoothly inserted into the hole 60. Also, in step S201, the extraction device 50 is inserted sufficiently until the rotating part 54 of the extraction device 50 is exposed on the back side of the seal member 2 (the side opposite to the side into which the extraction device 50 is inserted).

Next, the wire 58 is operated to rotate the movable part 56 of the extraction device 50 (step S202). In step S202, as shown in FIG. 12B, with the rotating part 54 exposed on the back side of the seal member 2, the wire 58 is operated so that the angle of the movable part 56 with respect to the main body part 52 is 90 degrees (in other words, the movable part 56 is approximately parallel to the back side of the seal member 2).

Next, the main body 52 of the pulling device 50 is pulled toward the user to pull out the sealing member 2 (step S203). In step S203, when the main body 52 is pulled toward the user, the movable part 56, which has been rotated 90 degrees relative to the main body 52, comes into contact with a wide area on the back side of the sealing member 2, thereby effectively transmitting the tensile force applied to the main body 52 to the sealing member 2.

When the seal member 2 is pulled out, frictional force occurs between the cut seal member 2 and the surrounding area, creating resistance. However, by using the pulling device 50 to effectively transmit tensile force to the cut seal member 2, the seal member 2 can be efficiently pulled out even when the frictional force is large. In particular, when the frictional force is large, it is possible to reduce the frictional force by cutting the cut seal member 2 into smaller pieces, making the pulling out easier, but such cutting work is time-consuming. In contrast, in this embodiment, the cut seal member 2 can be efficiently pulled out in large chunks without having to be cut into smaller pieces.

Figure 13 is a schematic diagram showing the extraction operation using an extraction device 70 according to another embodiment. In this embodiment, the extraction device 70 comprises a main body 72 and a balloon 74. The main body 72 is a generally rod-shaped member, similar to the main body 52 of the extraction device 50 according to the previous embodiment. The balloon 74 is a member that can be expanded by air introduced through a hollow passage 76 formed inside the main body 72. When no air is introduced into the balloon 74, the balloon 74, together with the main body 72, has a smaller diameter than the hole 60, and can be inserted from one side of the hole 60 formed in the sealing member 2.

The balloon portion 74 inserted into the hole 60 is inflated by introducing air from the outside at a position exposed on the other side of the sealing member 2. (For ease of understanding, Figure 13 shows the extraction device 70 above the piping 12 with the balloon portion 74 uninflated, and the extraction device 70 below the piping 12 with the balloon portion 74 inflated.) At this time, the other side of the sealing member 2 is closed by the lid member 78, and the balloon portion 74 is inflated within the closed space surrounded by the lid member 78, sleeve 13, piping 12, and sealing member 2. Since the inflated balloon portion 74 has a larger diameter than the hole 60, pulling the main body 72 toward the front in this state causes the balloon portion 74 to press against the back side of the sealing member 2 with the assistance of the expansion force of the balloon portion 74, thereby enabling the sealing member 2 to be extracted. At this time, the inflated balloon portion 74 has a larger diameter than the hole 60, preventing it from being extracted from the hole 60.

In this embodiment, multiple holes 60 are formed in the sealing member 2 along the circumferential direction of the pipe 12, and a pulling device 70 can be applied to each hole 60. In this case, the sealing member 2 cut by the cutting device 20 can be efficiently extracted as a block without further cutting into smaller pieces.

Figure 14 is a schematic diagram showing an extraction operation using an extraction device 80 according to another embodiment. In this embodiment, the extraction device 80 includes a main body 82 and a contact portion 84. The main body 82 is a generally rod-shaped member, similar to the main body 52 included in the extraction device 50 according to the previous embodiment. The contact portion 84 is attached to the tip of the main body 82 and can contact the backside of the cut seal member 2. In this embodiment, the contact portion 84 has a shape that extends partially circumferentially around the pipe 12, thereby ensuring a large contact area with the cut seal member 2. As a result, when an operator presses the main body 82 from the backside of the seal member 2, the pressing force is efficiently transmitted to the cut seal member 2, making it easier to extract the cut seal member 2.

In addition, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate, without departing from the spirit of this disclosure.

The contents described in each of the above embodiments can be understood, for example, as follows:

(1) A cutting device according to one aspect includes:
A cutting device for cutting a seal member provided in a penetration portion formed in a wall member that partitions a first space and a second space adjacent to each other,
a shaft member connected to a rotationally driven output shaft and movable along an axial direction of an insertion member inserted into the through-hole by a rotational force transmitted from the output shaft;
At least one cutting blade attached to a tip end of the shaft member;
Equipped with.

According to aspect (1) above, by moving the shaft member axially using the rotational force transmitted from the output shaft, the cutting blade attached to the tip of the shaft member can be inserted into the seal member provided in the penetration section and cut through. This allows the user of the cutting device to cut the seal member simply by performing the simple action of rotating the output shaft of a power tool such as an electric drill. In particular, even when cutting seal members provided on small to medium-diameter pipes with a relatively narrow installation width, using a cutting device that uses such a cutting blade allows the seal member to be cut effectively without the cutting tool interfering with the pipe (and without damaging the pipe).

(2) In another aspect, in the above aspect (1),
a fixing member for fixing to the insertion member;
a holding portion attached to the fixing member, the holding portion having a groove portion corresponding to a thread portion formed on a surface of the shaft member, and thereby holding the shaft member so that the shaft member can be moved along the axial direction by the rotational force;
Equipped with.

According to the above aspect (2), the cutting device has a shaft member connected to a tip end provided with a cutting blade, which is fixed to the insertion member by a fixing member. The fixing member is provided with a holding portion for holding the shaft member. The holding portion has a groove portion that corresponds to a thread portion formed on the surface of the shaft member, and by converting the rotational force from the output shaft into movement along the axial direction of the shaft member, it is possible to achieve cutting of the sealing material with the cutting blade with an efficient structure.

(3) In another aspect, in the above aspect (1) or (2),
The tip portion is detachable from the shaft member.

According to aspect (3) above, the tip end provided with the cutting blade is configured to be detachable from the shaft member. This makes it easy to replace the cutting blade used to cut the sealing member.

(4) In another aspect, in any one of the above (1) to (3),
The tip portion has an inner surface formed with a recess corresponding to the end of the shaft member.

According to the above aspect (4), when the shaft member moves along the axial direction, the end of the shaft member can engage with a recess formed on the inner surface of the tip portion. This stabilizes (e.g., fixes) the relative positional relationship between the shaft member and the tip portion, allowing the cutting blade provided at the tip portion to accurately cut the sealing material.

(5) In another aspect, in any one of the above (1) to (4),
the tip portion has an opening into which the end of the shaft member is inserted via a gap,
The shaft member has a locking member engaged with the end inserted into the opening.

According to the above aspect (5), the end of the shaft member is inserted into the tip portion through the opening. The end of the shaft member is locked by a locking member inside the tip portion. Although a gap exists between the shaft member inserted into the tip portion and the opening, being locked by the locking member in this manner effectively prevents the shaft member from slipping out of the tip portion.

(6) In another aspect, in the aspect (3),
The at least one cutting blade is
a first cutting blade attached to the tip portion along a first direction;
a second cutting blade attached to the tip portion along a second direction intersecting the first direction;
Includes.

According to the above aspect (6), if the tip end provided with the cutting blade is detachable from the shaft member, providing multiple cutting blades at the tip end makes it possible to use each cutting blade separately depending on the purpose and application.

(7) In another aspect, in any one of the above (1) to (6),
A heating mechanism is provided for heating the at least one cutting blade.

According to aspect (7) above, by providing a heating mechanism, the cutting blade for cutting the sealing material can be heated. As a result, during cutting, the heated cutting blade reduces the hardness of the sealing material to be cut (i.e., softens the sealing material), allowing the cutting blade to cut the sealing material more accurately.

(8) In another aspect, in any one of the above (1) to (7),
The at least one cutting blade has an uneven blade surface along the extending direction of the shaft member.

According to the above aspect (8), the cutting blade has an uneven blade surface that runs in the direction of extension of the shaft member. This effectively prevents the cutting blade from being hindered in its movement due to friction or interference with the surrounding elastic sealing member when it moves axially and penetrates the sealing member.

(9) A cutting method according to one aspect includes:
a shaft member connected to an output shaft that is driven to rotate;
At least one cutting blade attached to a tip end of the shaft member;
A cutting method for cutting a seal member provided in a penetration portion formed in a wall member that partitions a first space and a second space adjacent to each other, using a cutting device comprising:
The method includes a cutting process in which the shaft member is moved along the axial direction of the insertion member inserted into the through-hole by the rotational force transmitted from the output shaft, thereby cutting the sealing member with the cutting blade.

According to the above aspect (9), by moving the shaft member axially using the rotational force transmitted from the output shaft, the cutting blade attached to the tip of the shaft member can be inserted into the seal member provided in the penetration section and cut through. This allows the user of the cutting device to cut the seal member simply by performing the simple action of rotating the output shaft of a power tool such as an electric drill. In particular, even when cutting seal members provided on small to medium-diameter pipes with a relatively narrow installation width, using a cutting device that uses such a cutting blade allows the seal member to be cut effectively without the cutting tool interfering with the pipe (and without damaging the pipe).

(10) In another aspect, in the aspect (9),
The cutting step is repeated along the circumferential direction of the insertion member.

According to the above aspect (10), the aforementioned cutting process is repeatedly performed along the circumferential direction of the insert member. This allows the sealing member applied around the insert member to be cut along the circumferential direction, and the sealing member can be efficiently separated from the insert member with simple work.

(11) In another aspect, in the above aspect (9) or (10),
The method further includes the step of pulling out the sealing member, which has been separated from the insertion member in the cutting step, from the penetration portion.

According to the above aspect (11), the sealing member can be removed from the penetration portion by pulling out the sealing member after cutting in the cutting process.

1 Structure 2 Sealing member 4 Penetration portion 5 Internal space 6 Wall member 8 First space 9 Second space 12 Pipe 13 Sleeve 20 Cutting device 22 Rotational power source 22a Output shaft 24 Shaft member 26 Fixing members 26a, 26b Clamp portion 26c Bolt 26d Nut 27 Holding portion 28 Tip portion 28a Frame body 28c Locking member 28d Recess 28e Opposing surface 30 Push-off blade 30a First push-off blade 30b Second push-off blade 31 Blade surface 40 Heating mechanism 50, 70, 80 Pulling device 54 Rotating portion 56 Movable portion 58 Wire 60 Hole portion 74 Balloon portion 78 Lid member 84 Abutting portion

Claims (10)

A cutting device for cutting a seal member provided in a penetration portion formed in a wall member that partitions a first space and a second space adjacent to each other,
a shaft member connected to a rotationally driven output shaft and movable along an axial direction of an insertion member inserted into the through-hole by a rotational force transmitted from the output shaft;
At least one cutting blade attached to a tip end of the shaft member;
a fixing member for fixing to the insertion member;
a holding portion attached to the fixing member, the holding portion having a groove portion corresponding to a thread portion formed on a surface of the shaft member, and thereby holding the shaft member so that the shaft member can be moved along the axial direction by the rotational force;
A cutting device comprising: The cutting device according to claim 1 , wherein the tip portion is detachable from the shaft member. A cutting device as described in claim 1 or 2, wherein a recess corresponding to the end of the shaft member is formed on the inner surface of the tip portion. the tip portion has an opening into which the end of the shaft member is inserted via a gap,
The cutting device according to claim 1 or 2, wherein the shaft member includes a locking member engaged with the end inserted into the opening. The at least one cutting blade is
a first cutting blade attached to the tip portion along a first direction;
a second cutting blade attached to the tip portion along a second direction intersecting the first direction;
The cutting device of claim 2 , comprising: The cutting device according to claim 1 or 2, further comprising a heating mechanism for heating the at least one cutting blade. The cutting device described in claim 1 or 2, wherein the at least one cutting blade has an uneven blade surface that extends in the direction of extension of the shaft member. A cutting device for cutting a seal member provided in a penetration portion formed in a wall member that partitions a first space and a second space adjacent to each other,
a shaft member connected to a rotationally driven output shaft and movable along an axial direction of an insertion member inserted into the through-hole by a rotational force transmitted from the output shaft ;
At least one cutting blade attached to a tip end of the shaft member;
a fixing member for fixing to the insertion member;
a holding portion attached to the fixing member, the holding portion having a groove portion corresponding to a thread portion formed on a surface of the shaft member, and thereby holding the shaft member so that the shaft member can be moved along the axial direction by the rotational force;
A cutting method for cutting the sealing member using a cutting device comprising:
A cutting method comprising a cutting step of cutting the sealing member with the cutting blade by moving the shaft member along the axial direction relative to the insertion member using the rotational force transmitted from the output shaft. The cutting method according to claim 8 , wherein the cutting step is repeatedly performed along a circumferential direction of the insert member. The cutting method according to claim 8 or 9 , further comprising the step of pulling out the sealing member, which has been cut off from the insertion member in the cutting step, from the penetration portion.