JP6382404B1 - Elevator guide rail fixing device and fixing method - Google Patents

Abstract

There is provided an elevator guide rail fixing device that can reduce a burden on an operator in installation work of a guide rail and is resistant to a horizontal load caused by an earthquake.
A fixing device includes a wall bracket that is fixed to a wall surface and a rail bracket that is fixed to a guide rail. A first fastening portion 40 and a pair of second fastening portions 51 and 52 are provided on the first and second overlapping portions 24 and 25 on which the brackets 21 and 22 overlap. The pair of second fastening portions 51 and 52 fix the rail bracket 22 to the wall bracket 21 more firmly than the first fastening portion 40. Each of the second fastening portions 51 and 52 is provided outside the first fastening portion 40 in the width direction Y of the guide rail 10.

Description

  Embodiments described herein relate generally to a fixing device for fixing an elevator guide rail to a wall of a hoistway and a fixing method using the device.

  The elevator includes a guide rail that guides a car and a counterweight. The guide rail is fixed to the wall surface of the hoistway through a plurality of fixing devices arranged at intervals in the height direction of the hoistway. Because the position of the wall of the hoistway is in error with the drawing, it is necessary to adjust the distance from the wall of the hoistway to the guide rail in order to install the guide rail so that it is perpendicular to the ground .

  The fixing device is configured by combining a plurality of brackets so that each dimension can be adjusted on site. The plurality of brackets are fixed to each other by welding, for example. However, since welding requires ventilation of the hoistway before and after the work, man-hours increase and time is required. In addition, since the finish of the welded portion tends to vary depending on the skill level of the operator, the quality may not be stable. Therefore, a fixing device that joins three brackets using fastening bolts instead of welding has been proposed.

International Publication No. 2015/029182

  However, when an earthquake occurs and the car and the counterweight are shaken, a load is applied to the fixing device via the guide rail. Increasing the number of screws for fixing the brackets or increasing the diameter of the screws to withstand the load increases the cost of the fixing device and the number of man-hours for installation work.

  The object of the present invention is to simplify the installation work of the guide rail, shorten the work time, make the finish uniform without being influenced by the skill level of the operator, and is resistant to loads such as earthquakes It is an object to provide a fixing device and a fixing method.

  According to one embodiment, an elevator guide rail fixing device includes a wall bracket fixed to a wall surface and a rail bracket fixed to the guide rail. A first fastening portion and a pair of second fastening portions are provided at a portion where the wall bracket and the rail bracket abut. The first fastening portion fixes the rail bracket to the wall bracket. The pair of second fastening portions fix the rail bracket to the wall bracket more firmly than the first fastening portion. Each second fastening portion is provided outside the first fastening portion in the width direction of the guide rail.

  Moreover, according to one Embodiment, the guide rail fixing method of an elevator fixes a wall bracket to a wall surface, and fixes a rail bracket to a guide rail. A first slot is formed in the wall bracket. The rail bracket is formed with a second long hole extending in a direction intersecting the first long hole. Adjust the relative position of the rail bracket with respect to the wall bracket, and tighten the bolt inserted in the part where the first long hole and the second long hole intersect with the nut to temporarily fix the relative position of the wall bracket and rail bracket To do. A drill screw is fastened to a portion outside the bolt in the width direction of the guide rail to finally fix the rail bracket to the wall bracket.

FIG. 1 is a side view schematically showing an example of the configuration of an elevator. FIG. 2 is a perspective view showing an example of a car that moves up and down along the guide rail. FIG. 3 is a plan view showing a state in which the guide device is in contact with the guide rail. FIG. 4 is a front view showing a state in which the guide rail is fixed to the wall surface of the hoistway through the fixing device. FIG. 5 is a perspective view showing a fixing device according to an embodiment. 6 is an exploded perspective view of the fixing device shown in FIG. FIG. 7 is a plan view for explaining a load acting on the second fastening portion.

  A fixing device 20 according to an embodiment will be described with reference to FIGS. 1 to 7. The fixing device 20 is a device that fixes the guide rail 10 of the elevator 1 to the wall surface 3 </ b> A of the hoistway 3. As will be described with reference to FIG. 4, the fixing device 20 is configured by combining a plurality of brackets 21 and 22 so that the distance D between the wall surface 3 </ b> A and the guide rail 10 can be adjusted according to the unevenness of the wall surface 3 </ b> A. .

  The wall bracket 21 is fixed to an anchor bolt 31 provided in advance on the wall surface 3A. The rail bracket 22 is fixed to the guide rail 10 by a rail clip 33. As will be described with reference to FIGS. 5 and 6, the brackets 21 and 22 are fixed by a first fastening portion 40 and a pair of second fastening portions 51 and 52. The fixing device 20 of the present invention is characterized in that two types of fastening portions having different functions and arrangements are used in combination for fixing the brackets 21 and 22.

  The 1st fastening part 40 is comprised from the volt | bolt 45 inserted in the 1st and 2nd long holes 43 and 44, and the nut 46 screwed by this volt | bolt 45, for example. Since the fastening force of the first fastening part 40 can be adjusted by tightening or loosening the nut 46, the relative positions of the brackets 21 and 22 can be easily adjusted within the length of the first and second elongated holes 43 and 44. Can be adjusted.

The pair of second fastening portions 51 and 52 that finally fix the brackets 21 and 22 are, for example, drill screws 53 that simultaneously perform drilling and formation of female threads. The first fastening portion 40 may be displaced within the length of the first and second elongated holes 43 and 44, whereas the second fastening portions 51 and 52 have a shape that follows the drill screw 53. Are fastened more firmly than the first fastening portion 40. In addition, each of the second fastening portions 51 and 52 is provided at a portion outside the first fastening portion 40 in the width direction Y of the guide rail 10, and as described with reference to FIG. it can withstand large loads P _Y than that provided in the site. Hereinafter, each configuration will be described in detail.

  FIG. 1 is a side view schematically showing an example of the configuration of the elevator 1. As shown in FIG. 1, the elevator 1 includes a hoistway 3 that communicates each floor of the building 2, a plurality of halls 4 provided on each floor of the building 2, and each hall 4 that moves within the hoistway 3. There is a car 5 to stop. Each landing 4 communicates with the hoistway 3 at a landing opening 4A that can be opened and closed by a landing door.

  The car 5 is connected to one end of the main rope 6 and is suspended in the hoistway 3. A counterweight 7 balanced with the weight of the car 5 is connected to the other end of the main rope 6. In the vicinity of the hoistway 3, a hoisting machine 8 that winds up the main rope 6 and a control panel 9 that controls the operation of the hoisting machine 8 are installed.

  In the example shown in FIG. 1, the machine room in which the hoisting machine 8 and the control panel 9 are installed is arranged above the hoistway 3. When the hoisting machine 8 winds or unwinds the main rope 6, the car 5 and the counterweight 7 move along a guide rail 10 fixed to the hoistway 3 in a slidable manner. The car 5 and the counterweight 7 are examples of lifting bodies.

  The guide rail 10 includes a pair of car guide rails 11 for guiding the car 5 and a pair of weight guide rails 12 for guiding the counterweight 7. The guide rails 11 and 12 have substantially the same shape and function. Each guide rail 10 extends in a straight line along the height direction of the hoistway 3 and is arranged in parallel with a space between each other.

  The guide rail 10 is fixed to the wall surface 3A via a plurality of fixing devices 20 installed on the wall surface 3A of the hoistway 3. The plurality of fixing devices 20 are arranged in a line at a predetermined interval in the height direction of the hoistway 3. The fixing device 20 will be described in detail later with reference to FIGS.

  FIG. 2 is a perspective view showing an example of the car 5 that moves up and down along the guide rail 10. As shown in FIG. 2, the car 5 includes a car frame 13 and a car body 14. The car frame 13 includes left and right vertical bars 13A and 13B, a lower beam 13C, and an upper beam 13D.

  The vertical rails 13 </ b> A and 13 </ b> B are located, for example, in front of the car guide rail 11 and are erected along the car guide rail 11. The lower beam 13C passes under the car body 14 and straddles between the lower ends of the vertical bars 13A and 13B. The upper beam 13D passes over the car body 14 and straddles between the upper ends of the vertical bars 13A and 13B.

  The car body 14 is a square box-shaped element and is supported by the car frame 13. The car body 14 is surrounded by vertical bars 13A and 13B, a lower beam 13C, and an upper beam 13D of the car frame 13. Roller type guide devices 15 are respectively attached to the left end and the right end of the lower beam 13C and the upper beam 13D. Although not shown, similarly, a guide device 15 is also attached to the counterweight 7.

  FIG. 3 is a plan view showing a state in which the guide device 15 is in contact with the guide rail 10. As shown in FIG. 3, the guide rail 10 is formed in a T shape in cross section and has a leg portion 16 and a blade portion 17. The back surface 16B of the leg portion 16 faces the wall surface 3A of the hoistway 3. The blade portion 17 is formed at the center portion of the leg portion 16 in the width direction Y, and protrudes from the surface 16A of the leg portion 16 to the side opposite to the wall surface 3A.

  The width direction Y of the leg part 16 corresponds to a direction parallel to the wall surface 3A in the horizontal direction. An example of the width direction Y is the depth direction of the hoistway 3. The height direction X of the blade portion 17 coincides with the direction of approaching or moving away from the wall surface 3A of the hoistway 3 in the horizontal direction. The height, width, and length directions X, Y, and Z of the guide rail 10 match, for example, the horizontal direction, the front-rear direction, and the vertical direction when the hoistway 3 is viewed from the landing 4 and are orthogonal to each other.

  The guide device 15 includes first to third rollers 18A, 18B, and 18C that are rotatably supported. The first roller 18 </ b> A is in contact with the tip edge of the blade portion 17 of the guide rail 10. The second and third rollers 18 </ b> B and 18 </ b> C are in contact with both side surfaces of the blade portion 17 so as to sandwich the blade portion 17 of the guide rail 10. The first to third rollers 18A, 18B, and 18C are in rolling contact with the guide rail 10 from three directions, and guide the car 5 or the counterweight 7 along the guide rail 10.

  FIG. 4 is a front view showing a state in which the guide rail 10 is fixed to the wall surface 3 </ b> A of the hoistway 3 through the fixing device 20. The fixing device 20 is configured by combining a plurality of brackets so that the distance D between the wall surface 3A and the guide rail 10 can be adjusted. In the example shown in FIG. 4, the fixing device 20 includes a wall bracket 21 fixed to the wall surface 3 </ b> A and a rail bracket 22 fixed to the guide rail 10.

  The wall bracket 21 has a base portion 23 and a first overlapping portion 24. The base 23 has a shape along the wall surface 3 </ b> A, and is fixed to an anchor bolt 31 embedded in the wall surface 3 </ b> A via a nut 32. The first overlapping portion 24 stands from the wall surface 3A toward the hoistway 3 so as to be orthogonal to the wall surface 3A.

  The rail bracket 22 has a second overlapping portion 25 and a rail support portion 26. The second overlapping portion 25 is overlapped with the first overlapping portion 24 of the wall bracket 21. The rail support portion 26 stands up from the edge of the second overlapping portion 25 along the back surface 16B of the leg portion 16 of the guide rail 10. A rail clip 33 is fixed to the rail support portion 26 via bolts 34 and nuts 35. The edge portion of the leg portion 16 is sandwiched between the rail clip 33 and the rail support portion 26 and is fixed to the rail support portion 26 of the guide rail 10.

  The distance D between the wall surface 3A of the hoistway 3 and the back surface 16B of the guide rail 10 can be adjusted by adjusting the overlap margin W of the first overlapping portion 24 and the second overlapping portion 25. The first and second overlapping portions 24 and 25 having the overlap allowance W adjusted are fixed to each other by the first fastening portion 40 and the pair of second fastening portions 51 and 52.

  The 1st fastening part 40 and a pair of 2nd fastening parts 51 and 52 are demonstrated with reference to FIG.5 and FIG.6. FIG. 5 is a perspective view showing the fixing device 20 according to an embodiment, and FIG. 6 is an exploded perspective view showing the fixing device 20. As shown in FIGS. 5 and 6, the first overlapping portion 24 of the wall bracket 21 is formed with a first elongated hole 43 extending in the first direction, and is formed in the second overlapping portion 25 of the rail bracket 22. Is formed with a second long hole 44 extending in a second direction intersecting the first direction.

  In the example shown in FIGS. 5 and 6, the first direction matches the width direction Y of the guide rail 10, and the second direction matches the height direction X of the guide rail 10. The first direction may coincide with the height direction X of the guide rail 10, and the second direction may coincide with the width direction Y of the guide rail 10.

  The first fastening portion 40 includes a bolt 45 inserted through the first and second elongated holes 43 and 44, and a nut 46 screwed onto the bolt 45. The bolt 45 and the nut 46 are an example of a fastener. A plurality of first fastening portions 40 are preferably provided. The fixing device 20 shown in FIGS. 5 and 6 is provided with a pair of first fastening portions 41 and 42.

  When the nut 46 is loosened, the rail bracket 22 superimposed on the wall bracket 21 can be freely moved within the range of the lengths of the first and second elongated holes 43 and 44. When the nut 46 is tightened, the position of the rail bracket 22 relative to the wall bracket 21 can be fixed by the frictional force generated from the fastening force of the bolt 45 and the nut 46.

  Each of the second fastening portions 51 and 52 is composed of a drill screw 53 having a cutting edge (drill) formed at the tip, and when fastened, the first and second overlapping portions 24 and 25 are drilled and at the same time a female screw is provided. Can be formed. The drill screw 53 is an example of a fastener that is different from the fastening part that constitutes the first fastening part 40.

  In the first fastening portion 40, the position can be freely adjusted within the range of the length of the first and second elongated holes 43, 44, but the relative position may be shifted if an excessive force is applied. On the other hand, since only the female screw having a shape following the drill screw 53 is formed in the second fastening portions 51 and 52, the relative positions of the brackets 21 and 22 can be more firmly fixed.

  Note that the fasteners of the second fastening portions 51 and 52 are not limited to the drill screw 53. For example, a bolt hole may be drilled in the brackets 21 and 22 whose positions have been adjusted, and bolts and nuts having the same diameter as the bolt hole may be fastened. If the bolt has the same diameter as the drill screw 53 or the bolt hole attached later, the brackets 21 and 22 can be firmly fixed without slipping until the fasteners are broken.

  The rear second fastening portion 51 is provided further to the rear than the rear end of the first fastening portion 40, and the front second fastening portion 52 is provided to the front further than the front end of the first fastening portion 40. ing. In the example shown in FIGS. 5 and 6, the rear second fastening portion 51 is provided further rearward than the rear end 44 </ b> R of the second long hole 44 constituting the rear first fastening portion 41. . The front side second fastening portion 52 is provided further to the front side than the front end 44F of the second long hole 44 constituting the front side first fastening portion 42.

  That is, in the width direction Y of the guide rail 10, the rear second fastening portion 51 is provided outside the rear end 44R of the rear first fastening portion 41, and the front second fastening portion 52 is disposed on the front side. The first fastening portion 42 is provided outside the front end 44F. In other words, the second fastening portion 51 on the rear side is provided farther from the rear end 44R of the first fastening portion 41 on the rear side when viewed from the center line C in the width direction Y passing through the blade portion 17 of the guide rail 10. The second fastening portion 52 on the front side is provided farther than the front end 44F of the first fastening portion 42 on the front side.

  A plurality of front holes 54 arranged in the height direction X of the guide rail 10 may be formed in the second overlapping portion 25. The leading hole 54 is not an essential configuration and may be omitted. When the tip hole 54 is formed in advance, and the cutting blade of the drill screw 53 is brought into contact with the tip hole 54, the cutting screw of the drill screw 53 guided by the tip hole 54 widens the tip hole 54, and the female screw is set. Since it forms, the installation work of the guide rail 10 becomes easy. Since the plurality of front holes 54 are arranged in the height direction X of the guide rail 10, the range in which the positions of the brackets 21 and 22 can be adjusted is widened.

  On the other hand, no pilot hole is formed in the first overlapping portion 24. A portion where the first overlapping portion 24 is drilled in the drill screw 53 is denoted by reference numeral 55 in FIG. Since the internal thread of the drill screw 51 can be formed in a free part of the first overlapping portion 24, the relative positions of the brackets 21 and 22 can be adjusted steplessly. A tip hole may be formed in the first overlapping portion 24. In that case, a pilot hole is not formed in the 2nd superimposition part 25 so that the internal thread of the drill screw 51 can be formed in the free site | part of the 2nd superimposition part 25. FIG.

  In the example shown in FIGS. 5 and 6, the screw hole 36 through which the anchor bolt 31 is inserted is formed as a long hole extending in the width direction Y of the guide rail 10. The position of the bracket 21 can be adjusted. A screw hole 37 for attaching the rail clip 33 is formed to have substantially the same diameter as the bolt 34, and the rail clip 33 is difficult to be displaced.

  Next, a fixing method for fixing the guide rail 10 using the above-described fixing device 20 will be described. The anchor bolt 31 embedded in the wall surface 3 </ b> A of the hoistway 3 is inserted into the screw hole 36 of the wall bracket 21. A nut 32 is screwed onto the anchor bolt 31 to fix the wall bracket 21 to the wall surface 3A.

  The second overlapping portion 25 of the rail bracket 22 is overlapped with the first overlapping portion 24 of the wall bracket 21, and the bolt 45 is inserted through the portion where the first and second elongated holes 43, 44 intersect. The nut 46 is tightened loosely so that the bolt 45 does not fall off. The rail bracket 22 is moved within the range of the length of the first and second elongated holes 43 and 44, and the rail support portion 26 is abutted against the back surface 16B of the guide rail 10 in a vertical state.

  The leg portion 16 of the guide rail 10 is sandwiched between the rail clips 33 and the bolts 34 and nuts 35 are tightened to fix the rail bracket 22 to the guide rail 10. When the position at which the guide rail 10 becomes vertical is determined, the nut 46 of the first fastening portion 40 is tightened to temporarily fix the relative positions of the brackets 21 and 22. In order to finally fix the first and second overlapping portions 24 and 25, the drill screw 53 is inserted into one of the front holes 54, and the drill screw 53 is rotated.

  The cutting blade at the tip of the drill screw 53 drills the first overlapping portion 24 without a pilot hole while expanding the tip hole 54. When the drill screw 53 is further rotated, a female screw is formed in the first overlapping portion 24, and the drill screw 53 is fastened to the first and second overlapping portions 24 and 25. The drill screw 53 fastened to the first and second overlapping portions 24, 25 is stronger than the bolt 45 and the nut 46 that sandwich the first and second overlapping portions 24, 25. The relative position of 25 is fixed.

By the way, when the car 5 or the counterweight 7 is shaken by the earthquake, a load acts on the fixing device 20 via the guide rail 10. When a load in the height direction X of the guide rail 10 is applied, the second fastening portions 51 and 52 only have to bear the load evenly, and can withstand even a relatively large load. However, when the load P _{Y in} the width direction Y of the guide rail 10 is applied, the second fastening portions 51 and 52 need to bear not only the load but also the moment due to this load. The load on 20 is large. For load P _Y in the width direction Y, it is described with reference to FIG.

FIG. 7 is a plan view for explaining the loads R ₁ and R ₂ acting on the second fastening portions 51 and 52 when the load P _Y acts on the guide rail 10.

  From the balance of the force in the width direction Y of the guide rail 10,

  From the balance of moments in one second fastening portion 51,

  From the balance of the force in the height direction X of the guide rail 10,

  From Equation (3) and Equation (4),

  From Equation (2) and Equation (5),

It becomes.

That is, when the load P _Y in the width direction Y acts on the guide rail 10, the larger the distance δ from one second fastening portion 51 to the other second fastening portion 52, the larger the second fastening portions 51, 52. The loads R ₁ and R ₂ acting on the are reduced.

    In the fixing device 20 of the present embodiment configured as described above, the brackets 21 and 22 are fixed by two types of fixing means having different functions and arrangements. The second fastening portions 51 and 52 that more firmly fix the brackets 21 and 22 are provided outside the first fastening portion 40 in the width direction Y of the guide rail 10. Therefore, the distance δ between the pair of second fastening portions 51 and 52 can be maximized.

When the load _PY is applied to the guide rail 10 due to an earthquake or the like, the loads R ₁ and R ₂ acting on the second fastening portions 51 and 52 become smaller as the distance δ between the second fastening portions 51 and 52 becomes larger. In the present embodiment, since the second fastening portions 51 and 52 are provided in the portion outside the first fastening portion 40, the second fastening portion 51 and 52 are provided as compared with the case where the second fastening portions 51 and 52 are provided in other portions. because 52 of the distance δ is increased, it can withstand a greater load P _Y.

  The 2nd fastening parts 51 and 52 of this embodiment are the drill screws 53 which can form an internal thread simultaneously with piercing the brackets 21 and 22. Since the brackets 21 and 22 can be fixed without a pre-formed pilot hole, the relative positions of the brackets 21 and 22 can be adjusted steplessly. Further, since the drill screw 53 is fastened to a female screw having a shape similar to the drill screw 53, the brackets 21 and 22 are fixed more firmly than the bolts 45 inserted through the first and second elongated holes 43 and 44 whose positions can be adjusted. it can.

  The first fastening portion 40 includes a bolt 45 inserted through the first and second elongated holes 43 and 44, and a nut 46 screwed onto the bolt 45. If the nut 46 is loosened, the rail bracket 22 can be moved freely within the range of the lengths of the first and second elongated holes 43 and 44, so that the installation work of the guide rail 10 is facilitated. At this time, since the first and second elongated holes 43 and 44 extend in different first and second directions, the relative positions of the brackets 21 and 22 are adjusted both in the first direction and in the second direction. it can.

  In addition, the screw hole 36 formed in the wall bracket 21 extends in the width direction Y of the guide rail 10. The plurality of front holes 54 formed in the rail bracket 22 are arranged in the height direction X of the guide rail 10. By moving the anchor bolt 31 within the range of the length of the screw hole 36 in accordance with the overlap margin W of the first and second overlapping portions 24, 25, or by selecting the optimum tip hole 54, the bracket 21, The range in which the relative position of 22 can be adjusted can be further expanded. Since the fixing method according to the present embodiment uses such a fixing device 20, the above-described excellent effects can be achieved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. For example, in the example shown in FIG. 1, the traction type elevator 1 is used, but a winding drum type elevator 1 may be used.

  DESCRIPTION OF SYMBOLS 1 ... Elevator, 3 ... Hoistway, 3A ... Wall surface 10, 11, 12 ... Guide rail, 20 ... Fixing device, 21 ... Wall bracket, 22 ... Rail bracket, 40, 41, 42 ... 1st fastening part, DESCRIPTION OF SYMBOLS 43 ... 1st long hole, 44 ... 2nd long hole, 45 ... Bolt, 46 ... Nut, 51, 52 ... 2nd fastening part, 53 ... Drill screw, 54 ... Multiple front holes, Y ... The width direction of a guide rail .

Claims (6)

A fixing device for fixing the guide rail to the wall of the elevator hoistway,
A wall bracket fixed to the wall surface;
A rail bracket superimposed on the wall bracket and fixed to the guide rail,
In the region where the wall bracket and the rail bracket overlap, a first fastening portion for fixing the rail bracket to the wall bracket, and the wall bracket more firmly than the first fastening portion. A pair of second fastening portions for fixing the rail bracket; and
Each said 2nd fastening part is a fixing device of the guide rail for elevators provided in the outer side rather than the said 1st fastening part in the width direction of the said guide rail.   The fixing device according to claim 1, wherein the second fastening portion is a drill screw having a cutting edge formed at a tip. A first elongated hole formed in the wall bracket; and a second elongated hole formed in the rail bracket;
The first fastening portion includes a bolt inserted through the first elongated hole and the second elongated hole, and a nut that is screwed to the bolt to sandwich the wall bracket and the rail bracket. The fixing device according to claim 1 or 2.   The fixing device according to claim 3, wherein the first long hole and the second long hole extend in different directions. A fixing method for fixing the guide rail to the wall of the elevator hoistway,
Fixing the wall bracket formed with the first elongated hole to the wall surface;
Fixing the rail bracket formed with the second elongated hole to the guide rail;
Adjusting the relative position of the rail bracket to the wall bracket;
A bolt inserted through a portion where the first long hole and the second long hole intersect is tightened with a nut to temporarily fix the relative position of the wall bracket and the rail bracket,
A method for fixing an elevator guide rail, wherein a pair of drill screws are fastened to a portion outside the bolt in the width direction of the guide rail to finally fix the rail bracket to the wall bracket. Either one of the rail bracket and the wall bracket has a plurality of front holes arranged in a direction approaching or moving away from the wall surface,
The method for fixing an elevator guide rail according to claim 5, wherein when the drill screw is fastened, the tip of the drill screw is brought into contact with any of the plurality of leading holes to guide the drill screw.

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