JP4621858B1 - Building drilling device, suspension attachment, and building drilling method - Google Patents

Abstract

An object of the present invention is to provide a building drilling device and a building drilling method capable of preventing the fall of a circularly-removed building material more reliably than before, regardless of the internal structure of upper and lower partition walls.
In a building drilling device according to the present invention, a cylindrical cutter and a suspension member are attached to a rotary output shaft, and a lower end portion of the suspension member is rotated in a horizontal posture and a standing posture. A movable lower end locking member 60 is provided. The length of the suspension member 40 is set so that the upper end of the lower end locking member 60 in the standing posture is positioned below the lower end of the cylindrical cutter 30.
[Selection] Figure 12

Description

  The present invention descends while rotating the cylindrical cutter from above to the upper and lower partition walls that divide the space up and down in the building, separates the circular removed building material from the upper and lower partition walls, and removes the circular shape with the suspension member The present invention relates to a building drilling device capable of holding a building material and preventing falling, a hanging attachment used therefor, and a building drilling method.

  When ducts, pipes, cables, etc. are routed from the first floor to the second floor of buildings such as factories and buildings, a cylindrical cutter is pressed against the floor of the second floor and the upper and lower partition walls between the first and second floors are circular A slit was formed, the circular removed building material inside the annular slit was removed, and a through hole between layers was drilled. Here, the cutting pieces and fragments of the comparatively small upper and lower partition walls generated by the above construction can be easily cleaned even when dropped on the first floor, or can be received by a tray. However, if it becomes a lump (circular removal building material) inside the annular slit, the impact at the time of dropping becomes larger than the above-mentioned debris etc., so it is difficult to receive it with a saucer, and the floor of the first floor is recessed. There was a problem that the first floor collided with the floor surface, and fragments were scattered over a wide area, which took time for cleaning work. On the other hand, the conventional building drilling device is provided with an anchor at the lower end portion of the suspension member suspended from the center portion of the upper end surface in the cylindrical cutter, and the anchor is a part of the upper and lower partition walls that becomes the circular removed building material. The circularly-removed building material was prevented from falling by being fixed to (see, for example, Patent Document 1).

WO 98/56552 (FIG. 1, page 8, lines 9 to 14)

  By the way, the anchor is fixed to the upper and lower partition walls by spreading the lower end side to the side in a recess drilled in the upper and lower partition walls. For this reason, in the above-described conventional building drilling device, the lower end portion of the anchor does not spread laterally in contact with the reinforcing bars embedded in the upper and lower partition walls, and the situation where the circularly removed building material falls off from the anchor may have occurred. In addition, when the upper and lower partition walls have a laminated structure having a waterproof layer in the middle, only the upper part of the waterproof layer is held by the anchor, and the lower part may fall to the first floor. It was. In other words, depending on the internal structure of the upper and lower partition walls, it may happen that the circular removed building material cannot be sufficiently prevented from falling.

  The present invention has been made in view of the above circumstances, and there is provided a building drilling device and a building drilling method capable of preventing the fall of the circularly-removed building material more reliably than before, regardless of the internal structure of the upper and lower partition walls. For the purpose of provision.

The building drilling device according to the invention of claim 1 made to achieve the above object descends while rotating the cylindrical cutter from above with respect to the upper and lower partition walls partitioning the space up and down in the building, By cutting the annular slit in the upper and lower partition walls, the circular removed building material inside the annular slit is separated from the upper and lower partition walls to form an inter-level through hole, and from the center of the upper end surface in the cylindrical cutter In a building punching device that can prevent a fall by holding a circularly removed building material with a suspended suspension member, the suspension is connected to the lower end portion of the suspension member so as to be pivotable and projecting laterally from the suspension member. A lower end locking member is provided that can be changed between an extended state and a standby state in which the amount of protrusion to the side is smaller than the extended state. The top position is cylindrical A building drilling machine set the length of the hanging member to be disposed below the lower end of the motor, a cylindrical cutter, the center of the cutter upper wall projecting inwardly from the upper end portion of the cylindrical wall The rotary drive source of the cylindrical cutter is provided with a rotating male screw shaft that is screwed and coupled to the mounting female screw hole. The upper end opening edge of the female screw hole for mounting is abutted against a cutter positioning step provided in the middle of the screw shaft in the longitudinal direction to prevent the cylindrical cutter from rotating around the rotary male screw shaft. The suspension member is characterized in that it is suspended from the upper end wall of the cutter, and the suspension member is screwed and attached to the rotating male screw shaft in the cylindrical cutter and extends in the vertical direction .

  According to a second aspect of the present invention, in the building perforating apparatus according to the first aspect, at the intermediate position in the vertical direction of the suspension member, the upper part and the lower part of the suspension member are rotatably connected to each other. It has a feature where an allowable joint portion is provided.

According to a third aspect of the present invention, in the building perforating apparatus according to the first or second aspect , the lower end locking member extends in the horizontal direction in an overhanging state, and the longitudinal center portion thereof is the lower end portion of the hanging member. It is characterized in that it is pivotably connected to the.

According to a fourth aspect of the present invention, in the building perforating apparatus according to the third aspect , both ends of a pair of straight portions extending in parallel in the vertical direction are provided at a lower end portion of the suspension member as a pair of half. An oval ring connected to the circular arc part is provided, and a semicircular arc part on the lower side of the ring is inserted into a rotation center hole formed through the rotation center of the lower end locking member , and the lower end locking member protruding from both ends in the axial direction substantially parallel to the direction of the rotational center hole interferes with the straight portion at the lower end engaging member is the standby state, the rotation direction from the standby state of the lower engaging member in one direction It has a feature in that it includes a rotation restricting projection to be limited and a non-slip concavo-convex portion formed on a surface of the lower end locking member facing upward in the overhanging state.

According to a fifth aspect of the present invention, in the building punching device according to any one of the first to fourth aspects, the urging means for urging the lower end locking member in the standby state into the overhanging state. It has the feature in having.

In the building drilling method according to the invention of claim 6, the cylindrical cutter is lowered while being driven to rotate with respect to the upper and lower partition walls partitioning the space up and down in the building, and an annular slit is cut in the upper and lower partition walls. By doing so, the circular removed building material inside the annular slit is separated from the upper and lower partition walls to form a through hole between the layers, and the circular removal is performed by the hanging member suspended from the center of the upper end surface in the cylindrical cutter. In the building drilling method that holds the building material and prevents it from falling, it is connected to the lower end of the suspension member so as to be pivotable, and projects from the suspension member to the side. A lower end locking member that can be changed to a standby state with a small amount of overhang is provided, and a suspension hole is formed in advance at the center of the portion of the upper and lower partition walls where the annular slit is cut, thereby forming a cylindrical cutter. Due to the annular slit At the start of cutting, all or part of the lower end locking member in the standby state is placed in the suspension hole, and the lower end locking member is held in the standby state by interference with the inner surface of the suspension hole. Before the circularly removed building material is separated from the upper and lower partition walls by the cutter, the entire lower end locking member appears below the suspension hole, and then the lower end locking member is changed from the standby state to the overhanging state to suspend It is characterized in that it can be locked to the lower opening edge of the hole.
According to a seventh aspect of the present invention, in the building drilling method according to the sixth aspect of the present invention, a gantry supporting the rotational drive source of the cylindrical cutter is fixed to the upper and lower partition walls so as not to be vertically movable and non-rotatable. In the pre-drilling cylindrical cutter that is detachably attached to the rotation output part, a small annular groove having a smaller diameter than the annular slit is formed to a position near the lower end of the upper and lower partition walls. Apply a lateral load to the upper end of the enclosed small cylindrical body, fold it from the lower end, pull out the small cylindrical body upward with a hook inserted into the small annular groove, and below the small cylindrical body in the upper and lower partition walls The remaining wall is punched out to pierce a suspension hole, and the pre-drilling cylindrical cutter is replaced with a cylindrical cutter to cut an annular slit.

In the building drilling method according to the invention of claim 8, the cylindrical cutter is lowered while being driven to rotate with respect to the upper and lower partition walls partitioning the space up and down in the building, and an annular slit is cut in the upper and lower partition walls. By doing so, the circular removed building material inside the annular slit is separated from the upper and lower partition walls to form an inter-level through hole, and the circular removed building material is held by the suspension member to prevent falling. , A suspension member insertion hole penetrating the rotation center of the rotary drive unit including the cylindrical cutter in the vertical direction is provided, and the suspension hole is previously penetrated in the center of the upper and lower partition walls where the annular slit is cut. In the suspension support base formed and fixed to the building, the suspension member is supported above the suspension member insertion hole, and the suspension member is inserted into the suspension member insertion hole and the suspension hole. , Provided at the lower end of the suspension member The Tangakaritome member after is engaged to the lower surface of the circular removal building materials, a building drilling method to separate the circular removal building material from the upper and lower partition wall, frame a vertical partition wall for supporting the rotary drive source of the cylindrical cutter In a pre-drilling cylindrical cutter that is fixed so that it cannot be moved up and down and cannot be rotated, and is attached to the rotation output part of the rotation drive source. A small cylinder is formed with a hook that forms an annular groove, applies a lateral load to the upper end of the small cylindrical body surrounded by the small annular groove in the upper and lower partition walls, folds from the lower end, and is inserted into the small annular groove The body is extracted upward, the remaining wall left below the small cylindrical body is punched out of the upper and lower partition walls, the suspension hole is drilled, the cylindrical cutter for pre-drilling is replaced with the cylindrical cutter, and the annular slit is cut . It has the characteristics.

The hanging attachment according to the invention of claim 9 is detachably attached to a building punching device that forms a through hole between layers by pressing a cylindrical cutter from above to an upper and lower partition wall that partitions a space up and down in the building. A hanging attachment for preventing the fall of the circularly removed building material cut from the upper and lower partition walls by the cylindrical cutter. The cylindrical cutter is arranged at the center of the upper end wall of the cutter projecting inward from the upper end of the cylindrical wall. The rotation drive source of the cylindrical cutter has a structure in which a rotating male screw shaft that is threadably coupled to the mounting female screw hole is suspended from the rotating male screw shaft. While the upper end opening edge of the female screw hole for mounting is abutted against the cutter positioning step provided in the middle of the longitudinal direction of the screw shaft, the cylindrical cutter is prevented from rotating around the rotating male screw shaft, Rolling in hanging under attachment for buildings drilling apparatus comprising a pendent state a part of the male screw shaft from the cutter upper end wall, vertically extending and being screwed attached to the rotating male screw shaft in the cylindrical cutter cylinder A suspended member that is detachably attached to the center of the upper end surface in the cutter, and a projecting state that is pivotally connected to the lower end of the suspended member and projects laterally; It has a feature in that it is provided with a lower end locking member that can be changed to a standby state in which the amount of lateral extension is smaller than that in the extended state.

[Invention of Claim 1]
In the case of drilling the through hole between the upper and lower partition walls by the building punching device according to claim 1, a suspension hole is formed in advance in the upper and lower partition wall, and the cylindrical shape is centered on the suspension hole. An annular slit may be cut in the upper and lower partition walls with a cutter. Then, as the lower end portion of the cylindrical cutter moves downward in the upper and lower partition walls, that is, as the annular slit deepens, the suspension member suspended from the central portion of the cylindrical cutter advances downward in the suspension hole. . When the lower end of the cylindrical cutter reaches the position near the lower surface of the upper and lower partition walls, the lower end of the hanging member appears below the hanging hole. Here, the lower end locking member is rotatably connected to the lower end portion of the hanging member, and the lower end locking member is extended from the hanging member to the side and from the protruding state. It is possible to change to a standby state in which the amount of lateral protrusion is small. In addition, the length of the suspension member is set so that the uppermost uppermost portion of the lower end locking member is disposed below the lower end of the cylindrical cutter regardless of the standby state or the extended state. . As a result, when the lower end of the cylindrical cutter reaches a position near the lower surface of the upper and lower partition walls, the entire lower end locking member appears below the suspension hole, and the lower end locking member is extended from the standby state. The lower end locking member can be kept waiting for the circular removed building material inside the annular slit. When the circular removed building material is separated from the upper and lower partition walls by the cylindrical cutter, the circular removed building material is supported from below by the lower end locking member to prevent the fall. Thus, in the building drilling apparatus of the present invention, the circular removed building material is supported from below by the lower end locking member, so that the circular removed building material can be prevented from falling more reliably than before regardless of the internal structure of the upper and lower partition walls. It becomes possible to do. Further, according to the configuration of the present invention, the cylindrical cutter has a structure in which a female screw hole for attachment penetrating in the vertical direction is provided in the center portion of the cutter upper end wall projecting inward from the upper end portion of the cylindrical wall, The rotational drive source of the cylindrical cutter includes a rotating male screw shaft that is screwed into the female screw hole for attachment, and is attached to a cutter positioning step provided in the longitudinal direction of the rotating male screw shaft. The upper end opening edge of the female screw hole is abutted to prevent the cylindrical cutter from rotating around the rotating male screw shaft, and a part of the rotating male screw shaft is suspended from the upper end wall of the cutter. In the case where a conventional building drilling device exists, the conventional building drilling device is added to the building drilling device according to the present invention by screwing and attaching the suspension member to the rotating male screw shaft in the cylindrical cutter. It can be easily changed.

[Invention of claim 2]
According to the building punching device of the second aspect, the rotation-permissible joint provided in the suspension member prevents the lower end locking member at the lower end portion of the suspension member from rotating integrally with the cylindrical cutter. Thereby, the situation where a lower end locking member rotates and it collides with the inner surface of a suspension hole, and can be prevented can be prevented.

[Inventions of Claims 3 and 4 ]
A plurality of lower end locking members may be provided at the lower end portion of the suspension member, with the lower end locking member pivoting about the lower end portion thereof and standing up to be in a standby state while falling and projecting. As in the invention of Item 3 , the lower end locking member may extend in the horizontal direction in an overhanging state, and may have a structure in which the center portion in the longitudinal direction is rotatably connected to the lower end portion of the suspension member. According to the invention of claim 3 , the structure of the lower end locking member can be simplified. When it is set as the structure of Claim 3 , according to invention of Claim 4 , the direction in which a lower end latching member rotates from a standby state is limited to one direction, and the uneven | corrugated | grooved part for antiskid always is among the lower end latching members. The surface provided with can be brought into contact with the circularly removed building material. And the uneven | corrugated | grooving part for anti-slip | dips can be made to bite into a circular removal building material, and it becomes possible to stabilize a circular removal building material.

[Invention of claim 5 ]
According to the building punching device of claim 5 , when the lower end portion of the cylindrical cutter reaches the position near the lower surface of the upper and lower partition walls, the entire lower end locking member appears below the suspension hole, The stop member automatically changes from the standby state to the overhanging state by the urging force of the urging means.

[Invention of claim 6 ]
In the construction drilling method according to claim 6, a suspension hole is formed in advance in the upper and lower partition walls, and an annular slit is cut in the upper and lower partition walls with a cylindrical cutter around the suspension hole. . Then, as the lower end portion of the cylindrical cutter moves downward in the upper and lower partition walls, the suspension member suspended from the center portion of the cylindrical cutter advances downward in the suspension hole. And, when the lower end of the cylindrical cutter reaches the position near the lower surface of the upper and lower partition walls, the lower end locking member provided at the lower end of the hanging member appears below the hanging hole. Can be changed from the standby state to the overhanging state so that the lower end locking member is waiting for the circular removed building material inside the annular slit in the downward direction. When the circular removed building material is separated from the upper and lower partition walls by the cylindrical cutter, the circular removed building material is supported from below by the lower end locking member to prevent the fall. Thus, in the building drilling apparatus of the present invention, the circular removed building material is supported from below by the lower end locking member, so that the circular removed building material can be prevented from falling more reliably than before regardless of the internal structure of the upper and lower partition walls. It becomes possible to do.
[Invention of Claim 7]
According to the building drilling method of the seventh aspect, since the pre-drilling cylindrical cutter and the cylindrical cutter are used after being exchanged for the same rotary drive source, the rotary drive source can be effectively used. In addition, a small circular groove is formed in the upper and lower partition walls with a pre-drilling cylindrical cutter, a lateral load is applied to the upper end of the small cylindrical body surrounded by the small circular groove, and the small circular groove is folded from the lower end. After pulling out the small cylinder with the hook inserted in the annular groove, the remaining wall below the small cylinder is punched out of the upper and lower partition walls, and the suspension hole is drilled. It does not fall below the partition wall.

[Invention of Claim 8 ]
In the building drilling method according to claim 8 , a suspension member insertion hole penetrating in the vertical direction through the rotation center of the rotary drive unit including the cylindrical cutter in the building drilling device is provided, and an annular shape is formed in the upper and lower partition walls. A suspension hole is formed in advance in the center of the portion where the slit is cut, and the suspension member is supported above the suspension member insertion hole by a suspension support base fixed to the building. Is inserted into the suspension member insertion hole and the suspension hole, and the lower end locking member provided at the lower end of the suspension member is engaged with the lower surface of the circular removal building material, and then the circular removal building material is removed from the upper and lower partition walls. Separate. Thus, in the building drilling apparatus of the present invention, the circular removed building material is supported from below by the lower end locking member, so that the circular removed building material can be prevented from falling more reliably than before regardless of the internal structure of the upper and lower partition walls. It becomes possible to do. In addition, since the pre-drilling cylindrical cutter and the cylindrical cutter are replaced with the same rotational drive source and used, the rotational drive source can be effectively used. In addition, a small circular groove is formed in the upper and lower partition walls with a pre-drilling cylindrical cutter, a lateral load is applied to the upper end of the small cylindrical body surrounded by the small circular groove, and the small circular groove is folded from the lower end. After pulling out the small cylinder with the hook inserted in the annular groove, the remaining wall below the small cylinder is punched out of the upper and lower partition walls, and the suspension hole is drilled. It does not fall below the partition wall.

[Invention of claim 9 ]
According to the configuration of the ninth aspect, regardless of the standby state or the overhanging state, the suspension member is arranged such that the uppermost uppermost portion of the lower end locking members is disposed below the lower end of the cylindrical cutter. By setting the length, the conventional building drilling device can be easily changed to the building drilling device described in claim 1. Note that the length of the suspension member may be adjustable by a length adjustment mechanism, or may be fixed to a certain length.

The perspective view of the building drilling apparatus which concerns on 1st Embodiment of this invention. Side sectional view of cylindrical cutter Front view of the lower end locking member in the upright position Side view of the lower end locking member in the upright position Perspective view of a state where a cylindrical cutter for pre-drilling of a building drilling device is mounted Side cross-sectional view of pre-drilling cylindrical cutter Side cross-sectional view of the upper and lower section walls cut with a pre-drilling cylindrical cutter Side sectional view of the upper and lower compartment walls with the bottom end of the small cylinder folded Side sectional view of the upper and lower partition walls in the middle of eliminating the small cylinder Side sectional view of the upper and lower section walls cut by a cylindrical cutter Side sectional view of the upper and lower partition walls with the lower end locking member passing through the suspension hole Side cross-sectional view of the upper and lower section walls with the circular removed building material separated Perspective view of stopper Side view of a building drilling device according to a second embodiment of the present invention. Side sectional view of the upper and lower section walls cut by a cylindrical cutter Side sectional view according to modification Side view according to modification Side view according to modification Side view according to modification

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. As shown in FIG. 1, the building punching device 10 of the present embodiment has a structure in which a rotary drive source 21 for rotationally driving a cylindrical cutter 30 is supported by an elevating mechanism 11 so as to be movable up and down. The lifting mechanism 11 includes a fixed base 12 and a movable base 16. The fixed base 12 has a structure in which a prismatic column 14 is erected vertically from a fixed platen 13 fixed to a floor of a building with an anchor (not shown). A rack 15 extending in the vertical direction is attached to one side surface of the support column 14, and a stopper 118 for preventing the movable base 16 from falling is detachably provided. Specifically, the stopper 118 has a U-shape when viewed from above and is fixed by tightening a bolt 118B (see FIG. 13) at the rear end, so that the mounting position can be changed up and down. Further, locking protrusions 118T and 118T are formed at the front end portion of the stopper 118 so as to protrude rearward so as to mesh with the rack 15. A buffer material sheet (not shown) is laid on the upper and lower surfaces 118S of the stopper 118 (only the lower surface is shown in FIG. 13).

  The movable base 16 has a base body 17 fitted to the support column 14 so as to be movable up and down. A pinion (not shown) meshed with the rack 15 is provided inside the base main body 17, and a portion of the rotating shaft 18 that rotates integrally with the pinion that protrudes outward from one side surface of the base main body 17 is operated in the radial direction. The bar 19 penetrates through the linear movement. The movable base 16 can be moved up and down along the support column 14 by operating the operation bar 19. In addition, spherical stoppers 19A and 19A for retaining are attached to both ends of the operation bar 19.

  A rotational drive source 21 is fixed to the front surface of the movable base 16. The rotational drive source 21 has a structure in which a speed reducer 21G is integrally assembled with a lower end portion of a motor 21M, and a rotational output shaft 22 extends downward from the lower end portion of the rotational drive source 21. Further, on the rear surface of the movable base 16, an operation switch (not shown) for starting and stopping the rotation drive source 21 is provided, and a portal handle portion 23 is formed to protrude.

  As shown in FIG. 2, the rotary output shaft 22 of the rotary drive source 21 has a rotary male screw shaft 25 according to the present invention at a lower portion than an axial intermediate portion, and a cylindrical cutter 30 is screwed there. It is fitted. The cylindrical cutter 30 has a cylindrical structure in which the upper end of the cylindrical wall 31 is closed by the cutter upper end wall 32 and the bottom is opened and the lower end is opened. A connecting sleeve 33 protrudes upward from the center of the cutter upper end wall 32, and an inner portion of the connecting sleeve 33 is a female screw hole 34 for attachment penetrating in the vertical direction. Then, the rotating male screw shaft 25 is screwed into the female screw hole 34 for attachment, and the large-diameter portion 26 and the lower end surface 26A of the rotating output shaft 22 above the rotating male screw shaft 25 (refer to “the present invention”). The connection sleeve 33 is in contact with the cutter positioning step portion. A plurality of cutting teeth 35 are provided at the lower end of the cylindrical wall 31 along the circumferential direction. In the present embodiment, the outer diameter of the cylindrical cutter 30 is 250 to 600 [mm].

  In a state where the cylindrical cutter 30 is screwed onto the rotary male screw shaft 25, a part of the rotary male screw shaft 25 is suspended from the cutter upper end wall 32 of the cylindrical cutter 30. A hanging attachment 140 is attached to the rotating male screw shaft 25 in the cylindrical cutter 30.

  The suspension attachment 140 is configured by connecting a lower end locking member 60 to the lower end portion of the suspension member 40, and the suspension member 40 is configured by connecting the chain 50 to the lower end portion of the connection shaft 41. The connecting shaft 41 extends in the up-down direction, and has a large-diameter portion 41A on the upper side and a small-diameter portion 41B on the lower side from the middle portion. At the center of the large diameter portion 41A, a first female screw portion 43 opened at the upper end surface is provided, and at the center of the small diameter portion 41B, a second female screw portion 44 opened at the lower end surface is provided. Then, the first female thread portion 43 is screwed and attached to the rotary male screw shaft 25 so that the upper end surface of the suspension member 40 is abutted against the inner upper surface of the cylindrical cutter 30 so that the connecting shaft 41 is the rotary male screw shaft. 25 is fixed. Thereby, the suspension attachment 140 rotates integrally with the cylindrical cutter 30.

  An adjustment bolt 42 is screwed to the second female screw portion 44, and the adjustment bolt 42 can be moved to an arbitrary position in the vertical direction of the connecting shaft 41 by changing the screwing depth. Further, the chain 50 is connected to the lower end portion of the adjustment bolt 42 via a rotation allowable joint portion 45. The rotation allowable joint portion 45 includes a first movable portion 46 and a second movable portion 47 arranged vertically. The first movable portion 46 and the second movable portion 47 are connected to each other around the rotation axis extending in the vertical direction so as to be mutually rotatable and inseparable from each other in the vertical direction.

  A support shaft 46 </ b> S extends upward from the first movable portion 46, and the support shaft 46 </ b> S is fixed to the shaft core portion of the adjustment bolt 42. On the other hand, a connecting hole 47A is formed through the second movable portion 47 in the horizontal direction, and the chain 50 is connected to the connecting hole 47A. More specifically, the chain constituting ring 51 at the upper end of the plurality of chain constituting rings 51 constituting the chain 50 is inserted. As shown in FIG. 4, each chain constituting ring 51 has a semicircular arc-shaped semicircular arc portion 51B, 51B between both ends of a pair of linear portions 51A, 51A extending in parallel in the vertical direction. A notch (not shown) is provided in one straight portion 51A of the chain constituting ring 51 at the upper end and the lower end of the chain 50, and the notch is closed with a connecting nut 51C. It can be changed between the open state and the open state.

  Now, a lower end locking member 60 is attached to the chain constituting ring 51 at the lower end of the chain 50. Specifically, as shown in FIG. 3, the lower end locking member 60 has a substantially band plate shape as a whole, and its center of gravity (that is, the center in the longitudinal direction of the lower end locking member 60 and the width direction). A rotation center hole 63 is formed through the center position. And the semicircular arc part 51B in the chain structure ring 51 is penetrated by the rotation center hole 63, and the lower end locking member 60 is hold | maintained so that rotation around a horizontal axis centering on a gravity center position is possible.

  A plurality of anti-slip protrusions 62 (corresponding to the “non-slip uneven portion” of the present invention) are formed on one side surface located at one end in the width direction of the lower end locking member 60. Each non-slip protrusion 62 is substantially triangular and has a sharp tip. A plurality of the locking protrusions 62 are arranged symmetrically with respect to the longitudinal center of the lower end locking member 60 (see FIG. 2).

  Female screw holes 60N are formed in the opposite corners of one side of the lower end locking member 60 opposite to the side where the anti-slip protrusions 62 are formed, in the thickness direction of the lower end locking member 60, respectively. The rotation restricting bolts 61 and 61 are screwed into the pair of female screw holes 60N and 60N. More specifically, as shown in FIG. 4, one rotation restricting bolt 61 has a bolt head 61 </ b> H disposed on one surface on the front and back of the lower end locking member 60, and the other rotation restricting bolt 61 is The bolt head 61H is screwed onto the other surface of the front and back surfaces of the lower end locking member 60.

  As shown in FIG. 3, when the lower end locking member 60 rotates in one direction from a horizontal posture in which the longitudinal direction of the lower end locking member 60 faces the horizontal direction and projects from the suspension member 40 to both sides, The bolt head 61 </ b> H of the working bolt 61 contacts the connecting nut 51 </ b> C of one linear portion 51 </ b> A of the chain constituting ring 51. On the contrary, when the lower end locking member 60 is rotated in the other direction from the horizontal posture, the bolt head 61H of the other rotation restricting bolt 61 comes into contact with the other linear portion 51A of the chain constituting ring 51. As a result, the lower end locking member 60 is regulated so as not to be in a horizontal posture with the anti-slip projection 62 group disposed below, and the non-slip projection 62 is not interrupted when the lower end locking member 60 is in the horizontal posture. The group is arranged on the upper surface side. Further, in a state where the bolt head 61H and the chain constituting ring 51 are in contact with each other, the lower end locking member 60 is in an upright posture parallel to the vertical direction. In the present embodiment, the horizontal posture corresponds to the “overhanging state” of the present invention, and the upright posture and the inclined posture inclined with respect to the vertical direction correspond to the “standby state” of the present invention.

  As shown in FIG. 2, the length of the suspension member 40 is such that the uppermost uppermost portion of the lower end locking member 60 is the cylindrical cutter 30 regardless of whether the lower end locking member 60 is upright or horizontal. It is set to be arranged below the lower end of the. More specifically, the length of the suspension member 40 is set such that the lower end locking member 60 is in the upright posture and the distance L2 between the uppermost portion of the lower end locking member 60 and the lower end of the cylindrical cutter 30 is set. ing. The distance L2 is such that the concrete is not sheared even if it receives a shearing force of the weight of the concrete of the integral integral of the cylindrical cutter 30 to an area obtained by the product of the distance L2 and the inner peripheral length of the cylindrical cutter 30. Is set.

  In the building punching apparatus 10 of the present embodiment, the suspension member 40 and the cylindrical cutter 30 are removed from the rotation output shaft 22 of the rotation drive source 21, and instead, the pre-drilling cylindrical cutter 30V shown in FIG. The pre-drilling cylindrical cutter 30V that can be attached to the shaft 22 has a different outer diameter from the cylindrical cutter 30, has a cutting tooth 35 at the lower end, and a connecting sleeve 33 at the upper end. This is the same as the cylindrical cutter 30. The outer diameter D1 (see FIG. 6) of the pre-drilling cylindrical cutter 30V is the horizontal length of the lower end locking member 60 in the horizontal position, that is, the end portion from the longitudinal center of the lower end locking member 60. Is shorter than the length L1 (see FIG. 2).

  Moreover, in this embodiment, coolant water is supplied to the axial part of the cylindrical cutter 30 via the rotary joint which is not shown in figure. The coolant water passes through the inside of the rotary output shaft 22 and is discharged from a drain port (not shown) provided at the upper end portion of the suspension member 40. In order to prevent the discharged coolant water from falling from the hole in the floor of the building to the lower floor, the building drilling device 10 of the present embodiment is provided with a tubular levee 130 as a separate member. (See FIG. 10). Specifically, the tubular dyke 130 includes a seal member 131 and a levee main body 132 placed thereon, and the upper end opening of the levee main body 132 is narrowed toward the lower side.

  The description regarding the structure of the building drilling apparatus 10 of this embodiment is above. Next, the building drilling method using the building drilling apparatus 10 will be described. FIG. 7 shows an upper and lower partition wall 100 that partitions a predetermined floor and a floor below the predetermined floor of the building. When the upper and lower partition walls 100 are drilled with through-holes 110 (see FIG. 12) for passing cables, pipes, etc., the fixed plate 13 of the building drilling device 10 is anchored on the upper surface of the upper and lower partition walls 100, for example. And the column 14 is fixed upright from the upper and lower partition walls 100. Then, the pre-drilling cylindrical cutter 30V is attached to the rotation output shaft 22 of the rotation drive source 21, and first, the diameter is smaller than the length L1 (see FIG. 2) from the center to the end of the lower end locking member 60 in the longitudinal direction. The suspension hole 107 is drilled.

  Specifically, for example, the thickness of the upper and lower partition walls 100 is checked by a design drawing, the pre-drilling cylindrical cutter 30V is rotated by the rotation drive source 21, and the operation bar 19 is operated to operate the pre-drilling cylinder. The cutter 30V is pressed against the upper and lower partition walls 100 from above. Then, the cutting teeth 35 of the pre-drilling cylindrical cutter 30V cut the small annular groove 103 in the upper and lower partition walls 100, and a part of the upper and lower partition walls 100 is cut off as the small cylindrical body 105. Here, even if the reinforcing bars 101 and the waterproof layer 102 are embedded in the upper and lower partition walls 100, the reinforcing bars 101 and the waterproof layer 102 are cut by the pre-drilling cylindrical cutter 30V.

  When the cutting teeth 35 of the pre-drilling cylindrical cutter 30V reach the position near the lower end surface of the reinforcing bar 101 as shown in FIG. 7, the pre-drilling cylindrical cutter 30V is removed from the upper and lower partition walls 100 as shown in FIG. A force F is applied to the upper end portion of the cylindrical body 105 from the side to break the lower end portion of the small cylindrical body 105.

  Next, the core extraction tool 120 (corresponding to the “hook” of the present invention) shown in FIG. 9 is inserted into the small annular groove 103. The core extraction tool 120 has a plate or rod shape extending in the vertical direction, and has a structure in which a lower end portion is bent at a substantially right angle and a hook portion 120F is provided. Therefore, the core extraction tool 120F of the core extraction tool 120 is inserted in a state along the small annular groove 103 and then twisted, and the hook portion 120F at the lower end is locked to the lower surface of the small cylindrical body 105 and pulled up. Thereby, the small cylindrical body 105 is extracted above the upper and lower partition walls 100. Then, the remaining wall 106 below the small cylindrical body 105 in the upper and lower partition walls 100 is punched below the upper and lower partition walls 100, and a suspension hole 107 is formed through the upper and lower partition walls 100.

  Next, as shown in FIG. 1, instead of the pre-drilling cylindrical cutter 30V, the cylindrical cutter 30 is attached to the rotation output shaft 22 of the rotary drive source 21, and the stopper 118 is attached to the column according to the cutting end position of the cylindrical cutter 30. Set to 14. Further, as shown in FIG. 2, the suspension attachment 140 is attached to the rotation output shaft 22 inside the cylindrical cutter 30, and the suspension member 40 is adjusted by the chain 50 to a length corresponding to the thickness of the upper and lower partition walls 100. . And the cylindrical dyke 130 is set to the edge of the suspension hole 107 (refer FIG. 10). Next, as shown in FIG. 3, the lower end locking member 60 is brought into an upright posture. Here, since the rotation center of the lower end locking member 60 is disposed at the position of the center of gravity, in the state where the rotation of the cylindrical cutter 30 is stopped and the lower end locking member 60 is not subjected to centrifugal force, any rotation is possible. The lower end locking member 60 can be stopped at the rotation position. That is, the lower end locking member 60 can be maintained in an upright posture. Then, the cutting teeth 35 of the cylindrical cutter 30 move to a position adjacent to the upper surface of the upper and lower partition walls 100, and the lower end locking member 60 in the upright posture is accommodated in the suspension hole 107.

  Next, the cylindrical cutter 30 is rotationally driven and pressed against the upper and lower partition walls 100 from above. Then, the annular slit 108 concentric with the suspension hole 107 is cut in the upper and lower partition walls 100. At this time, even if the lower end locking member 60 is rotated, the diameter of the suspension hole 107 is smaller than the entire length of the lower end locking member 60, so that the lower end locking member 60 is not in a horizontal posture and is in a standby state. Retained. Further, between the rotation output shaft 22 of the rotation drive source 21 and the lower end locking member 60, a rotation allowable joint portion 45 capable of blocking rotation is provided. Thereby, even if the lower end locking member 60 is caught on the inner surface of the suspension hole 107, the lower end locking member 60 is prevented from being damaged or deformed.

  As the cutting of the upper and lower partition walls 100 proceeds by the cylindrical cutter 30, the lower end locking member 60 descends in the suspension hole 107 along with this. When the lower end portion of the cylindrical cutter 30 reaches a position near the lower end of the upper and lower partition walls 100, the entire lower end locking member 60 comes out below the suspension hole 107 as shown in the change in FIGS. 10 to 11. Then, the lower end locking member 60 is not caught by the inner surface of the suspension hole 107 and is not restricted from turning, and the rotation allowing joint 45 transmits the rotation from the rotation output shaft 22 to the lower end locking member 60. At this time, if the lower end locking member 60 is in an inclined posture, it receives a centrifugal force at both ends and changes to a horizontal posture. Further, if the lower end locking member 60 remains in an upright posture, when it is slightly tilted from the upright posture due to vibration, it receives a centrifugal force and changes to an inclined posture, and finally becomes a horizontal posture. In this embodiment, the centrifugal force corresponds to the “biasing means” of the present invention.

  In this way, the lower end locking member 60 is maintained in an upright posture when inserted into the suspension hole 107, and automatically changes from the standby state to the horizontal posture when passing through the suspension hole 107, and moves up and down. The partition wall 100 is in a state of waiting for the circular removed building material 111 inside the annular slit 108.

  If the cutting by the cylindrical cutter 30 further proceeds in this state, the circular removed building material 111 is eventually separated from the upper and lower partition walls 100. Then, the circular removed building material 111 is displaced downward, and the circular removed building material 111 is received by the lower end locking member 60. Thereby, it is prevented that the circular removed building material 111 falls to the floor below the upper and lower partition walls 100. Here, even when the lower end locking member 60 is shifted to the side, both ends of the lower end locking member 60 are hooked on the lower edge of the suspension hole 107, so that the circular removed building material 111 can be reliably supported. In addition, since the non-slip protrusion 62 of the lower end locking member 60 can be bitten into the circular removed building material 111, the holding of the circular removed building material 111 by the lower end locking member 60 is stabilized. When the cylindrical cutter 30 is lifted by the lifting mechanism 11 of the building punching device 10, the circular removed building material 111 is also lifted together with the cylindrical cutter 30 and pulled out above the upper and lower partition walls 100. As a result, an inter-level through hole 110 corresponding to the outer diameter of the cylindrical cutter 30 is drilled in the upper and lower partition walls 100.

  Thus, in the building drilling apparatus 10 of this embodiment, since the circular removal building material 111 is supported from below by the lower end locking member 60, the circular removal is more reliably performed than before, regardless of the internal structure of the upper and lower partition walls 100. The falling of the building material 111 can be prevented. Moreover, the building drilling device can be easily changed to the building drilling device 10 according to the present invention by simply screwing and attaching the suspension attachment 140 to the rotating male screw shaft 25 in the existing building drilling device. . In addition, since the pre-drilling cylindrical cutter 30V and the cylindrical cutter 30 can be exchanged and used for the same rotational drive source 21, the rotary drive source 21, the lifting mechanism 11 and the like can be effectively used.

[Second Embodiment]
This embodiment is shown in FIGS. 14 and 15, and is different from the first embodiment in that a suspension member insertion hole 21 </ b> K is formed through the center of the rotational drive source 21 </ b> V in the building drilling device 10 </ b> V. . Specifically, the suspension member insertion hole 21 </ b> K penetrates the shaft portions of the speed reducer 21 </ b> G, the motor 21 </ b> M, and the rotation output shaft 22 that constitute the rotation drive source 21 </ b> V in the vertical direction. A bobbin 85 around which a suspension wire 83 is wound is provided at the upper end portion of the support column 14. Further, a suspension support arm 87 extends from a position near the upper end of the support column 14 toward an upper position of the cylindrical cutter 30, and a relay wheel 84 is rotatably attached to the tip thereof. Then, as shown in FIG. 15, the suspension wire 83 drawn from the bobbin 85 is inserted through the suspension member insertion hole 21 </ b> K of the rotational drive source 21 </ b> V via the relay wheel 84 from above, and the cylindrical cutter 30. It is connected to the support shaft 46S of the rotation allowance joint 45 described above. In the present embodiment, the suspension member 83 according to the present invention is configured by the suspension wire 83, the support shaft 46S, the rotation allowable joint portion 45, and the chain 50. The fixed base 12 including the suspension support arm 87 corresponds to the “suspending support base” of the present invention.

  The description regarding the structure of the building punching apparatus 10V of this embodiment is above. Next, a building drilling method using this building drilling apparatus 10V will be described. Also in this embodiment, instead of the cylindrical cutter 30, a pre-drilling cylindrical cutter 30V is attached to the building drilling apparatus 10V, and the base body 17 is formed through the upper and lower partition walls 100 (see FIGS. 7 to 9). . Before the upper and lower partition walls 100 are cut by the cylindrical cutter 30, the lower end locking member 60 is inserted into the suspension hole 107, and the lower end locking member 60 is wound up by the hoisting handle 85H of the bobbin 85 to move up and down. The lower end locking member 60 is locked to the lower end opening edge of the suspension hole 107 in the lower surface of the partition wall 100. Then, the cylindrical cutter 30 is rotationally driven and pressed against the upper and lower partition walls 100 to cut the annular slit 108, and the amount of the lowered cylindrical cutter 30 is suspended by the hoisting handle 85 H of the bobbin 85. 83 is wound up, and the state where the lower end locking member 60 is always locked to the lower surface of the upper and lower partition walls 100 is maintained. Then, the cutting with the cylindrical cutter 30 proceeds until the lower end of the cylindrical cutter 30 penetrates the upper and lower partition walls 100. Thus, when the circular removed building material 111 is separated from the upper and lower partition walls 100 by the cylindrical cutter 30, the circular removed building material 111 is supported from below by the lower end locking member 60, and the inner structure of the upper and lower partition walls 100 is Regardless, the fall of the circular removed building material 111 can be prevented more reliably than before.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

(1) As shown in FIG. 16, the rotation output portion 122 is shifted in the horizontal direction from the motor 21 </ b> M via the gears 90 and 91, and the suspension wire 83 is formed in the rotation output portion 122. The structure inserted in 121K may be sufficient.

(2) A configuration in which a weight portion 69 is provided on the side opposite to the anti-slip projection 62 group, like a lower end locking member 60V shown in FIG. According to this configuration, the lower end locking member 60V can be biased to the horizontal posture by its own weight.

(3) Like the lower end locking member 60W shown in FIG. 18, the weight portion 69W is provided on the same side as the anti-slip projection 62 group and is biased to rotate from the upright posture to the opposite side to the horizontal posture. Also good. According to this configuration, the lower end locking member 60 </ b> W can be reliably placed in the upright posture when inserted through the suspension hole 107. Even with this configuration, the lower end locking member 60 </ b> W can be biased to a horizontal posture by centrifugal force.

(4) In the above-described embodiment, the lower end locking member 60 is configured to be rotatable around the central portion in the longitudinal direction. However, like the lower end locking member 90 shown in FIG. 19A moves up and down in the suspension hole 107 in the folded state (corresponding to the “standby state” of the present invention), and the umbrella shown in FIG. 19B opens after passing through the suspension hole 107. The configuration may be a state (corresponding to the “overhanging state” of the present invention).

(5) In the embodiment, the lower end locking member 60 is rotatable with respect to the rotation output shaft 22, but may be configured to be unrotatable with respect to the rotation output shaft 22. In addition, according to the configuration of the embodiment, it is possible to prevent the lower end locking member 60 from rotating integrally with the cylindrical cutter 30 and prevent deterioration due to collision with the inner surface of the suspension hole 107.

(6) In the above embodiment, the fixed platen 13 is fixed to the upper surface of the upper and lower partition walls 100 with an anchor, but may be fixed with a suction cup.

(7) In the first embodiment, the length of the hanging member 40 can be adjusted by the chain 50, but may be fixed to a certain length.

( 8 ) In the second embodiment, the lower end locking member 60 passes through the suspension hole 107 together with the chain 50. However, the suspension member with the lower end engagement member 60 removed from the chain 50 is suspended from the suspension hole 107. A locking member having a horizontal length longer than the diameter of the suspension hole 107 may be non-rotatably attached to the chain 50 that has been inserted through the suspension hole 107 and has been pulled out below the suspension hole 107.

( 9 ) The lower end locking member 60 waiting for the circular removed building material 111 is not limited to the horizontal posture, and may be a posture slightly inclined with respect to the horizontal direction. Even in this case, when the circular removed building material 111 moves downward, both ends of the lower end locking member 60 can be hooked on the lower edge of the suspension hole 107 to prevent the circular removed building material 111 from falling. .

10, 10V Building drilling device 12 Fixed base 21, 21V Rotation drive source 21K, 121K Suspension member insertion hole 22, 122 Rotating output shaft 25 Rotating male spiral shaft 30 Cylindrical cutter 30V Pre-drilling cylindrical cutter 34 Female spiral for mounting Hole 40 Suspension member 45 Rotation allowable joint 60, 60V, 60W, 92 Lower end locking member 62 Non-slip projection (non-slip uneven part)
81 hanging lower member insertion hole 83 suspension wires 87 suspension support arm
100 Upper and lower partition walls 103 Small annular groove 105 Small cylindrical body 106 Remaining wall 107 Suspension hole 108 Annular slit 110 Inter-layer through-hole 111 Circular removal building material 140 Suspension attachment

Claims (9)

The cylindrical cutter is lowered from above and below the upper and lower partition walls that divide the space up and down in the building, and the circular slit inside the annular slit is cut by cutting the annular slit in the upper and lower partition walls. The removed building material is separated from the upper and lower partition walls to form a through hole between the layers, and the circular removed building material can be prevented from falling by holding the suspended building member suspended from the center of the upper end surface in the cylindrical cutter. In a building drilling device,
It is connected to the lower end of the suspension member so as to be pivotable, and can be changed between an overhanging state projecting laterally from the suspension member and a standby state in which the overhanging amount is smaller than the overhanging state. The lower end locking member is provided, and the uppermost portion of the lower end locking member regardless of whether it is in the standby state or the extended state is disposed below the lower end of the cylindrical cutter. A building drilling device in which the length of the suspension member is set ,
The cylindrical cutter has a structure in which a female screw hole for attachment penetrating in the vertical direction is provided at the center of the upper end wall of the cutter projecting inward from the upper end of the cylindrical wall,
The rotational drive source of the cylindrical cutter includes a rotating male screw shaft that is screwed and coupled to the female screw hole for attachment,
While the upper end opening edge of the female screw hole is abutted against the cutter positioning step provided in the middle of the longitudinal direction of the rotary male screw shaft, the cylindrical cutter is prevented from rotating around the rotary male screw shaft, A state in which a part of the rotating male screw shaft is suspended from the upper end wall of the cutter,
The building piercing device , wherein the suspension member is screwed to the rotating male screw shaft and extends in the vertical direction in the cylindrical cutter .   The rotation allowable joint part which connects an upper part and a lower part from the intermediate position so that rotation is mutually possible is provided in the intermediate position in the up-and-down direction of the suspension member. Building drilling device. The lower end locking member extends in a horizontal direction in the extended state, and a central portion in a longitudinal direction thereof is rotatably connected to a lower end portion of the suspension member. The building drilling device described. The lower end of the suspension member is provided with an oval ring formed by connecting both ends of a pair of linear portions extending in parallel in the vertical direction with a pair of semicircular arc portions,
The semicircular arc portion on the lower side of the ring is inserted into a rotation center hole formed through the rotation center of the lower end locking member,
Projecting from both ends of the lower end locking member in a direction substantially parallel to the axial direction of the rotation center hole, the lower end locking member interferes with the linear portion in the standby state, and the lower end locking member A rotation restricting protrusion that limits the rotation direction from the standby state to one direction;
The building perforating apparatus according to claim 3, further comprising a non-slip uneven portion formed on a surface of the lower end locking member facing upward in the projecting state. The building according to any one of claims 1 to 4, further comprising an urging unit that urges the lower end locking member in the standby state to the extended state. Drilling device. The cylindrical cutter is lowered from above and below the upper and lower partition walls that divide the space up and down in the building, and the circular slit inside the annular slit is cut by cutting the annular slit in the upper and lower partition walls. The removed building material is separated from the upper and lower partition walls to form an inter-level through hole, and the circular removed building material is held by a suspension member suspended from the center of the upper end surface in the cylindrical cutter to prevent falling. In the building drilling method,
It is connected to the lower end of the suspension member so as to be pivotable, and can be changed between an overhanging state projecting laterally from the suspension member and a standby state in which the overhanging amount is smaller than the overhanging state. A lower end locking member is provided,
A penetrating hole is formed in advance in the center of the portion of the upper and lower partition walls where the annular slit is cut,
At the start of cutting of the annular slit by the cylindrical cutter, all or part of the lower end locking member in the standby state is disposed in the suspension hole, and due to interference with the inner surface of the suspension hole Holding the lower end locking member in the standby state;
Before the circular removed building material is separated from the upper and lower partition walls, the entire lower end locking member appears below the suspension hole, and then the lower end locking member is changed from the standby state to the extended state. The building drilling method is characterized in that it can be locked to the lower end opening edge of the suspension hole. A pedestal that supports the rotational drive source of the cylindrical cutter is fixed to the upper and lower partition walls so that it cannot move up and down and cannot rotate.
In the pre-drilling cylindrical cutter detachably attached to the rotation output part of the rotation drive source, a small annular groove having a smaller diameter than the annular slit is formed up to a position near the lower end of the upper and lower partition walls,
A lateral load is applied to the upper end portion of the small cylindrical body surrounded by the small annular groove in the upper and lower partition walls, and the small cylindrical body is folded by a hook inserted into the small annular groove. Pull upwards,
Perforating the suspension hole by punching the remaining wall left below the small cylindrical body among the upper and lower partition walls,
7. The building drilling method according to claim 6, wherein the pre-drilling cylindrical cutter is replaced with the cylindrical cutter and the annular slit is cut. The cylindrical cutter is lowered from above and below the upper and lower partition walls that divide the space up and down in the building, and the circular slit inside the annular slit is cut by cutting the annular slit in the upper and lower partition walls. In the building perforation method of separating the removed building material from the upper and lower partition walls to form a through hole between layers and holding the circular removed building material with a suspension member to prevent the fall,
A suspension member insertion hole penetrating the rotation center of the rotation drive unit including the cylindrical cutter in the vertical direction is provided,
A penetrating hole is formed in advance in the center of the portion of the upper and lower partition walls where the annular slit is cut,
The suspension support base fixed to the building supports the suspension member above the suspension member insertion hole, and the suspension member is inserted into the suspension member insertion hole and the suspension hole. In addition, after the lower end locking member provided at the lower end of the suspension member is locked to the lower surface of the circular removed building material, the circular removed building material is separated from the upper and lower partition walls. ,
A pedestal that supports the rotational drive source of the cylindrical cutter is fixed to the upper and lower partition walls so that it cannot move up and down and cannot rotate .
In the pre-drilling cylindrical cutter detachably attached to the rotation output part of the rotation drive source, a small annular groove having a smaller diameter than the annular slit is formed up to a position near the lower end of the upper and lower partition walls,
A lateral load is applied to the upper end portion of the small cylindrical body surrounded by the small annular groove in the upper and lower partition walls, and the small cylindrical body is folded by a hook inserted into the small annular groove. Pull upwards,
Perforating the suspension hole by punching the remaining wall left below the small cylindrical body among the upper and lower partition walls,
The building drilling method, wherein the cylindrical cutter for pre-drilling is replaced with the cylindrical cutter and the annular slit is cut. A cylindrical cutter is pressed from above on the upper and lower partition walls that divide the space up and down in the building, and is detachably attached to the building drilling device that forms through holes between layers, and is cut from the upper and lower partition walls by the cylindrical cutter. A hanging attachment for preventing the fall of the circular removed building material,
The cylindrical cutter has a structure in which a female screw hole for attachment penetrating in the vertical direction is provided at the center of the upper end wall of the cutter projecting inward from the upper end of the cylindrical wall, and the rotational drive source of the cylindrical cutter Includes a rotating male screw shaft that is threadably coupled to the mounting female screw hole, and a cutter positioning step provided in the middle of the rotating male screw shaft in the longitudinal direction of the mounting female screw hole. The upper end opening edge is abutted to prevent the cylindrical cutter from rotating around the rotating male screw shaft, and a part of the rotating male screw shaft is suspended from the upper end wall of the cutter. In the lower attachment,
A suspension member that extends in the vertical direction and is screwed and attached to the rotary male screw shaft in the cylindrical cutter, and is detachably attached to the central portion of the upper end surface of the cylindrical cutter;
A lower end locking member that is rotatably connected to the lower end portion of the suspension member and can be changed between a projecting state projecting laterally and a standby state in which the projecting amount to the side is smaller than the projecting state. A suspension attachment characterized by comprising:

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