Cutting device and cutting method

Abstract

To efficiently cut a seal member provided at a penetration part of a structure with small burden.SOLUTION: This device is a device for cutting seal member that is provided at a penetration part formed in a wall member which partitions a first space and a second space adjacent to each other, and comprises a shaft member and a press-cutting blade. The shaft member is connected to an output shaft which is rotationally driven, and can be moved along an axial direction of an insertion member, which is inserted in the penetration part, by torque transmitted from the output shaft with respect to the insertion member. The press-cutting blade is attached to a tip of the shaft member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a cutting device and a cutting method. [Background technology]

[0002] When laying out pipes, cables, etc. across structures (hereinafter referred to as "wall members" as a comprehensive concept) that separate adjacent spaces, such as walls and floors that make up a structure, penetrations may be provided in the wall members. For example, in nuclear power plant buildings, fire and water protection against fires, tsunamis, etc. is achieved by placing sleeves in penetration holes formed in the wall members and providing sealing members in the gaps between the pipes, cables, etc. that pass inside the sleeves. Such sealing members are formed by filling, for example, fire-resistant materials or elastic resins such as polyurethane and silicone rubber.

[0003] When such sealing materials deteriorate due to the surrounding environment or over time, maintenance is required to maintain their performance. Maintenance is performed by removing the sealing material and then installing a new one. The sealing material 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 technique for cutting concrete using a wire saw for concrete, in which a looped wire with a diamond tip attached is rotated at high speed to remove the concrete, rather than the sealing material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 05-185422 Summary of the Invention [Problem to be solved by the invention]

[0005] Methods such as volume removal using drills or cutting with blades such as cutter knives or chisels are performed manually by workers, which takes a lot of time and is inefficient. Furthermore, the method described in Patent Document 1 requires relatively large concrete materials to be cut, and the equipment is large in scale due to the high-speed rotation of the wire, 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.

[0006] At least one embodiment of the present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a cutting device and a cutting method that can efficiently cut a sealing member provided at a penetration portion of a structure with little burden. [Means for solving the problem]

[0007] 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 the tip of the shaft member; Equipped with.

[0008] 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 the tip 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. [Effects of the Invention]

[0009] According to at least one embodiment of the present disclosure, it is possible to provide a cutting device and a cutting method that can efficiently cut a seal member provided at a penetration portion of a structure with little burden. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a front view showing the overall configuration of the structure. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 1 is a side view showing a cutting device according to an embodiment together with a structure. [Figure 4] FIG. 4 is a cross-sectional view taken along line BB in FIG. [Figure 5] FIG. 4 is a view showing the tip portion of FIG. 3 from above. [Figure 6] FIG. 4 is an enlarged view of the tip portion of FIG. 3. [Figure 7] This is a modification of FIG. [Figure 8] 1 is a flowchart illustrating a cutting method according to an embodiment. [Figure 9] 10 is a schematic diagram showing a cutting range for a sealing member in a cutting operation. FIG. [Figure 10] FIG. 1 is a configuration diagram showing an extraction device according to an embodiment. [Figure 11] 11 is a flowchart showing an extraction operation using the extraction device of FIG. 10. [Figure 12A] FIG. 12 is a process diagram corresponding to FIG. [Figure 12B] FIG. 12 is a process diagram corresponding to FIG. [Figure 12C] FIG. 12 is a process diagram corresponding to FIG. [Figure 13]10A and 10B are schematic diagrams showing an extraction operation using an extraction device according to another embodiment. [Figure 14] 10A and 10B are schematic diagrams showing an extraction operation using an extraction device according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the configurations described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0012] First, a structure 1 including a sealing member 2 that is to be cut by a cutting device according to at least one embodiment of the present disclosure will be described with reference to Figures 1 and 2. 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 AA in Figure 1.

[0013] The structure 1 has a wall member 6 having a thickness t. The wall member 6 is configured to partition a first space 8 and a second space 9 adjacent to each other, and a penetration 4 is formed in the wall member 6 for providing a pipe 12 across the first space 8 and the second space 9. The pipe 12 is an insertion member having an internal space 5 through which a fluid can pass. When viewed from the front as shown in FIG. 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, thereby ensuring a gap 14 between the penetration 4 and the pipe 12, and is configured so that the pipe 12 does not directly interfere with the wall member 6 even if thermal expansion displacement due to temperature change or forced displacement due to an earthquake, etc. occurs. The pipe 12 is arranged concentrically with the penetration 4.

[0014] In this embodiment, the structure arranged in the penetration part 4 is exemplified as a pipe 12, but it may be other structures such as a cable tray or a cable. Furthermore, the shape of the penetration part 4 is not limited to a substantially circular shape, and may be any shape.

[0015] Because the gap 14 serves as a path for flames and smoke in the event of a fire and for flooding due to a tsunami, the gap 14 is filled with a sealing member 2. In this embodiment, a sleeve 13, concentric with the pipe 12, is disposed 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 bonded to the inner diameter R2 of the penetration portion 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 performance 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.

[0016] When such a sealing member 2 deteriorates due to the surrounding environment or over time, maintenance is required to maintain its performance. Maintenance is performed by temporarily removing the sealing member 2 and installing a new sealing member 2. Removal of the sealing member 2 can be performed efficiently by cutting the sealing member 2 using a cutting method using a cutting device described below.

[0017] Next, we will explain the cutting device 20 used in the cutting operation of the sealing member 2. Fig. 3 is a side view showing the cutting device 20 according to one embodiment together with the structure 1, Fig. 4 is a cross-sectional view taken along line BB in Fig. 3, Fig. 5 is a view showing the tip portion 28 in Fig. 3 from above, and Fig. 6 is an enlarged view of the tip portion 28 in Fig. 3.

[0018] The cutting device 20 is a device for cutting the seal member 2 provided in the penetration portion 4, and includes a rotational power source 22, a shaft member 24, a fixed member 26, a tip portion 28, and a cutting blade 30.

[0019] 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 the like, or may be a manually powered device that can output rotational force by manually driving a component such as a handle. In the former case, a power tool such as an electric screwdriver can be used as the rotational power source 22.

[0020] The shaft member 24 is a rod-shaped member having a threaded portion 24a on the surface of which a thread of a predetermined pitch is provided. 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, thereby allowing the shaft member 24 to rotate together with the output shaft 22a.

[0021] The shaft member 24 is fixed to the pipe 12 by a holding portion 27 of the fixing member 26. As shown in Fig. 4, the fixing member 26 can fix the pipe 12 by clamping the pipe 12 from the outside over the entire circumference with a pair of approximately semicircular clamp portions 26a and 26b engaging with each other. The pair of clamp portions 26a and 26b are disposed above and below the pipe 12, respectively, and are fixed to the pipe 12 by having both ends of each clamp portion fastened to each other with a bolt 26c and a nut 26d.

[0022] The holding portion 27 is provided so as to protrude radially outward from one of the clamp portions (in this embodiment, this is clamp portion 26b, but it may be clamp portion 26a) included in the fixed member 26. A groove portion (not shown) corresponding to the thread portion 24a of the shaft member 24 is formed in the holding 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 thread portion 24a formed on the surface of the shaft member 24 engages with the groove portion of the holding portion 27 of the fixed member 26, thereby allowing the shaft member 24 to move in the axial direction (at this time, the rotational power source 22 and the tip portion 28 connected to the shaft member 24 also move in the axial direction together with the shaft member 24).

[0023] The holding portion 27 may be configured as a triangular screw, or more preferably as a trapezoidal screw, which has excellent structural durability. In the present embodiment, the holding portion 27 uses a screw structure to move the shaft member 24 in the axial direction, but other mechanisms (for example, a cylinder mechanism) may be used instead.

[0024] 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 FIG. 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.

[0025] Furthermore, the tip portion 28 is detachable from the shaft member 24. This allows the tip portion 28 to be replaced with one having a suitable cutting blade 30 depending on the cutting position or material of the sealing member 2 to be cut, or when the cutting blade 30 becomes worn, the entire tip portion 28 can be replaced, making it easy to replace the cutting blade 30 depending on the application or purpose.

[0026] 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.

[0027] 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 a plurality of cutting blades 30 (first cutting blade 30a and second cutting blade 30b). FIGS. 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 described 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.

[0028] The frame 28a has an opening 28b into which the end 24b of the shaft member 24 is inserted. The opening 28b has a diameter larger than that of the shaft member 24, and is formed so that when the shaft member 24 is inserted into the opening 28b, a gap 25 is formed between the opening 28b and the shaft member 24. The opening 28b is provided on the surface of the frame 28a opposite to the cutting blades 30. In this embodiment, the first cutting blade 30a is in a usable state, and therefore the shaft member 24 is inserted into the opening 28b provided on the surface of the frame 28a opposite to the first cutting blade 30a.

[0029] 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 locked by the locking member 28c from slipping out of the frame body 28a.

[0030] Furthermore, since the frame body 28a is open in the front-to-back direction of the paper in Figures 5 and 6, the user can detach the tip portion 28 from the shaft member 24 by removing the locking member 28c through the open area.

[0031] As described above, when the shaft member 24 moves axially toward the seal member 2 due to the rotational force, the end 24b of the shaft member 24 abuts against the opposing surface 28e of the frame 28a, thereby 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 allows the end 24b of the shaft member 24 to be stably fixed without shifting along the surface direction of the opposing surface 28e. 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.

[0032] In this embodiment, the end portion 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.

[0033] Furthermore, when the cutting blade 30 is to be detached from the sealing member 2, when the shaft member 24 is moved away from the sealing member 2, as described above, the locking member 28c is provided at the end 24b of the shaft member 24, thereby preventing it from being pulled out from the opening 28b.

[0034] 5, the cutting blade 30 has an uneven blade surface 31 that is formed along the extension direction of the shaft member 24. This effectively prevents the cutting blade 30 from being hindered in movement due to friction or interference with the surrounding elastic seal member 2 when the cutting blade 30 moves along the axial direction and pierces the seal member 2.

[0035] The blade surface shape of the cutting blade 30 may be flat, V-shaped, or a combination of these. The cutting surface may be provided on one side of the cutting blade 30 or on both sides.

[0036] Figure 7 is a modified example of Figure 5. In this modified example, 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 a heater that can be heated by power supplied from the outside via a power supply line 40a, for example, 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 heated well by the heating mechanism 40 by using a material with excellent thermal conductivity, such as stainless steel.

[0037] Although the heating mechanism 40 in this modification uses an electric power for heating, other methods, such as vibration or chemical heating, may be used.

[0038] Next, a method for cutting the seal member 2 using the cutting device 20 having the above configuration will be described. Fig. 8 is a flowchart showing the cutting method according to one embodiment.

[0039] First, the cutting device 20 is set (step S100). The setting performed in step S100 broadly includes setting the state of the cutting device 20 appropriately for cutting the seal member 2. Specifically, this includes fixing the cutting device 20 to the pipe 12 with a fixing member, and attaching the tip 28 having the cutting blade 30 suitable for the purpose and application to the cutting device 20.

[0040] Next, the position of the cutting blade 30 of the cutting device 20 is adjusted (step S101). In step S101, a cutting position is specified 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 the cutting position.

[0041] 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 together with the shaft member 24 advances toward the seal member 2. While the rotary power source 22 is turned ON, the cutting blade 30 gradually advances toward the seal member 2 and cuts through the seal member 2.

[0042] Next, it is determined whether the cutting operation is complete (step S103). In step S103, this is determined 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.

[0043] When the pushing-off operation is completed (step S103: YES), the pushing-off 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, so that the pushing-off blade 30 can be retracted from the seal member 2 along the axial direction together with the shaft member 24.

[0044] Next, it is determined whether the cutting operation on the seal member 2 is complete (step S105). Here, FIG. 9 is a schematic diagram showing the cutting range of the seal member 2 during the cutting operation. In the cutting method, the seal member 2 is repeatedly cut using the cutting device 20 along a cutting line L1 that runs along the circumferential direction near the outer surface of the pipe 12 and a cutting line L2 that runs along the circumferential direction near the inner surface of the sleeve 13. In other words, since a single cutting operation can only form a cutting line that is the width of the cutting blade 30, it is necessary to repeat the cutting operation using the cutting blade 30 while changing the cutting position until the cutting lines L1 and L2 for separating the seal member 2 from the pipe 12 and the sleeve 13 are completed. In step S105, it is determined whether the cutting operation along these cutting lines L1 and L2 is complete.

[0045] If the cutting operation is not completed (step S105: NO), the cutting device 20 is set so that the cutting blade 30 moves to the next cutting position (step S106), and the process returns to step S102, whereby the cutting operation is repeated at the next cutting position.

[0046] In addition, Figure 3 etc. shows an example in which the pushing blade 30 is set to be positioned closer to the pipe 12 in accordance with the cutting line L1, but if the position closer to the sleeve 13 is to be pushed through 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 pushing blade 30 is radially opposite to that shown in Figure 3 etc.

[0047] 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, thereby completing the removal of the sealing member 2 (step S107).

[0048] Next, the pulling-out operation of the sealing member 2 in step S107 will be described in detail. The pulling-out operation 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, but may also be performed using a pulling-out device 50 described below. Fig. 10 is a configuration diagram showing the pulling-out device 50 according to one embodiment, Fig. 11 is a flowchart showing the pulling-out operation using the pulling-out device 50 of Fig. 10, and Figs. 12A to 12C are process diagrams corresponding to Fig. 11.

[0049] As shown in Fig. 10, the extraction device 50 includes 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 extending 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 an end 56a of the movable part 56, and by applying a tensile force to the wire 58 from the outside, the movable part 56 can rotate about the rotating part 54 as an axis.

[0050] 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 in the range of 0 to 90 degrees.

[0051] 12A, in the extraction method using the extraction device 50, first, a hole 60 is 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 the movable part 56 of the extraction device 50.

[0052] Next, the extracting device 50 is inserted into the hole 60 formed in step S200 (step S201). At this time, the extracting device 50 is in a state in which the main body 52 and the 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 described above, the hole 60 has a larger diameter than the main body 52 and the movable part 56, so the extracting device 50 can be smoothly inserted into the hole 60. Also, in step S201, the extracting device 50 is inserted sufficiently until the rotating part 54 of the extracting device 50 is exposed on the back side of the sealing member 2 (the side opposite to the side where the extracting device 50 is inserted).

[0053] 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, 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 surface of the seal member 2) with the rotating part 54 exposed on the back side of the seal member 2.

[0054] Next, the sealing member 2 is pulled out by pulling the main body 52 of the pulling device 50 toward you (step S203). In step S203, when the main body 52 is pulled toward you, the movable part 56, which has been rotated 90 degrees relative to the main body 52, comes into contact with the back surface of the sealing member 2 over a wide area, and the tensile force applied to the main body 52 is suitably transmitted to the sealing member 2.

[0055] 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 appropriately transmitting a tensile force to the cut seal member 2 using the pulling device 50 in this manner, the seal member 2 can be pulled out appropriately 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, thereby 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 being cut into smaller pieces.

[0056] 13 is a schematic diagram showing an extraction operation using an extraction device 70 according to another embodiment. In this embodiment, the extraction device 70 includes a main body 72 and a balloon 74. The main body 72 is a generally rod-shaped member, similar to the main body 52 included in the extraction device 50 according to the previous embodiment. The balloon 74 is a member that can be inflated with 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 seal member 2.

[0057] 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, FIG. 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 a 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, by pulling the main body 72 toward the front in this state, the balloon portion 74 presses the sealing member 2 from the back side 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, so it is prevented from being extracted from the hole 60.

[0058] In this embodiment, a plurality of holes 60 are formed in the sealing member 2 along the circumferential direction of the pipe 12, and the extraction 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 lump without further cutting into smaller pieces.

[0059] FIG. 14 is a schematic diagram illustrating 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 an abutment 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 abutment portion 84 is attached to the tip of the main body 82 and can abut against the backside of the cut seal member 2. In this embodiment, the abutment portion 84 has a shape that partially extends along the circumferential direction of 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.

[0060] In addition, within the scope of the present disclosure, 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.

[0061] The contents described in each of the above embodiments can be understood, for example, as follows.

[0062] (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 the tip of the shaft member; Equipped with.

[0063] According to the above aspect (1), by moving the shaft member along the axial direction 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 through-hole and cut through it. This allows a user of the cutting device to cut the seal member simply by performing the simple operation of rotating the output shaft of a power tool such as an electric drill. In particular, even when cutting a seal member provided in a small- to medium-diameter pipe with a relatively narrow installation width, by using a cutting device that uses such a cutting blade, the seal member can be suitably cut without the cutting tool interfering with the pipe (without damaging the pipe).

[0064] (2) In another embodiment, in the above embodiment (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.

[0065] According to the above aspect (2), in the cutting device, a shaft member connected to a tip end provided with a cutting blade is fixed to an 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 corresponding to a thread portion formed on the surface of the shaft member, and converts rotational force from the output shaft into movement along the axial direction of the shaft member, thereby achieving cutting of the sealing material by the cutting blade with an efficient structure.

[0066] (3) In another aspect, in the above aspect (1) or (2), The tip portion is detachable from the shaft member.

[0067] According to the above aspect (3), the tip end portion provided with the cutting blade is configured to be detachable from the shaft member, which makes it easy to replace the cutting blade used to cut the sealing member.

[0068] (4) In another embodiment, 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.

[0069] According to the above aspect (4), when the shaft member moves along the axial direction, the end of the shaft member can engage with the recess formed on the inner surface of the tip portion, thereby stabilizing (e.g., fixing) the relative positional relationship between the shaft member and the tip portion, thereby enabling the cutting blade provided at the tip portion to accurately cut the seal member.

[0070] (5) In another embodiment, 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.

[0071] 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 the locking member inside the tip portion. Although a gap is present 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.

[0072] (6) In another embodiment, in the above embodiment (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.

[0073] According to the above aspect (6), when the tip end provided with the cutting blade is detachable from the shaft member, by providing multiple cutting blades at the tip end, it becomes possible to use each cutting blade according to the purpose and application.

[0074] (7) In another embodiment, in any one of the above (1) to (6), A heating mechanism is provided for heating the at least one cutting blade.

[0075] According to the above aspect (7), the provision of a heating mechanism makes it possible to heat the cutting blade for cutting the sealing material. As a result, 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.

[0076] (8) In another embodiment, 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.

[0077] According to the above aspect (8), the cutting blade has an uneven blade surface along the extension direction of the shaft member, which effectively prevents the cutting blade from being hindered in its movement due to friction or interference with the surrounding elastic seal member when the cutting blade moves along the axial direction and pierces the seal member.

[0078] (9) A cutting method according to one embodiment includes the steps of: a shaft member connected to an output shaft that is driven to rotate; At least one cutting blade attached to the tip 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.

[0079] According to the above aspect (9), by moving the shaft member along the axial direction 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 through-hole and cut through it. This allows a user of the cutting device to cut the seal member simply by performing the simple operation of rotating the output shaft of an electric tool such as an electric drill. In particular, even when cutting a seal member provided in a small- to medium-diameter pipe with a relatively narrow installation width, by using a cutting device that uses such a cutting blade, the seal member can be suitably cut without the cutting tool interfering with the pipe (without damaging the pipe).

[0080] (10) In another embodiment, in the above embodiment (9), The cutting step is repeated along the circumferential direction of the insertion member.

[0081] According to the above aspect (10), the cutting step is repeatedly performed along the circumferential direction of the insert member, thereby cutting the seal member applied around the insert member along the circumferential direction, and thus the seal member can be efficiently separated from the insert member with a simple operation.

[0082] (11) In another embodiment, in the above embodiment (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.

[0083] 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 step. [Explanation of symbols]

[0084] 1 structure 2. Sealing material 4 Penetration 5. Interior space 6 Wall components 8 1st space 9 Second space 12 Piping 13 Sleeve 20 Cutting device 22 Rotational power source 22a Output shaft 24 Shaft member 26 Fixing member 26a, 26b Clamp section 26c bolt 26d Nut 27 Holding part 28 Tip 28a Frame 28c Locking member 28d recess 28e Opposite surface 30 Push-cutting blade 30a First cutting blade 30b Second cutting blade 31 Blade surface 40 Heating mechanism 50, 70, 80 Pulling device 54 Rotating part 56 Moving parts 58 Wire 60 Hole 74 Balloon Section 78 Lid member 84 Contact part

Claims

1. 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:

2. The cutting device according to claim 1 , wherein the tip portion is detachable from the shaft member.

3. The cutting device according to claim 1 or 2, wherein a recess corresponding to an end of the shaft member is formed on an inner surface of the tip portion.

4. 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.

5. 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:

6. The cutting device according to claim 1 or 2, further comprising a heating mechanism for heating the at least one cutting blade.

7. The cutting device according to claim 1 or 2, wherein the at least one cutting blade has an uneven blade surface along the extending direction of the shaft member.

8. A cutting device for cutting a sealing member provided in a penetration formed in a wall member that partitions a first space and a second space adjacent to each other, comprising: 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.

9. The cutting method according to claim 8 , wherein the cutting step is repeatedly performed along a circumferential direction of the insert member.

10. 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.

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