Opening positioning jig and opening forming method

Abstract

To provide an opening positioning tool and an opening forming method capable of accurately positioning while improving work efficiency.SOLUTION: An opening positioning jig 1 is attached to an outer surface of a steel foundation F connected to an anchor bolt fixed to a foundation B, and forms an opening for exposing the anchor bolt to the steel foundation F. This opening positioning tool 1 has a plate-like base part 10 arranged oppositely to an outer surface of a steel foundation F, a guide hole 20 for forming an opening in the steel foundation F, and an installation part 40 for detachably installing the base part 10 on the steel foundation F. The guide hole 20 is formed at a position corresponding to the opening in the base portion 10 when the base portion 10 is attached to the steel foundation F by the attachment portion 40.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an opening positioning jig and an opening forming method, and more particularly to an opening positioning jig for forming an opening in a foundation that exposes an anchor bolt, and an opening forming method for forming an opening in a foundation using the opening positioning jig. [Background technology]

[0002] The building body, including the exterior wall panels and columns, is supported from below by a steel base that is connected to anchor bolts fixed to the foundation. For example, Patent Document 1 discloses a steel base that is connected to anchor bolts buried in the foundation. The exterior wall panels and columns are installed on the steel base and fixed to the steel base with bolts.

[0003] On the other hand, if a building experiences differential settlement due to, for example, an earthquake or ground subsidence, it is necessary to repair the differential settlement by jacking up the building itself. For example, in the repair work described in Patent Document 2, the nuts on the anchor bolts fixed to the foundation are loosened to release the connection between the anchor bolts and the steel foundation, and then the building is jacked up until it is level. Then, the anchor bolts are extended and liners are inserted between the foundation and the steel foundation. The anchor bolts are then tightened to fasten the foundation and the steel foundation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-325193 [Patent Document 2] Japanese Patent Application Publication No. 10-331180 Summary of the Invention [Problem to be solved by the invention]

[0005] In buildings with steel foundations such as those described in Patent Document 1, anchor bolts are covered by the outer surface of the steel foundation. Therefore, when repairing uneven settlement, it is necessary to form openings in the outer surface of the steel foundation to expose the anchor bolt nuts. However, if the opening formation position is shifted, the anchor bolt nuts will not be aligned or the opening will interfere with the ribs of the steel foundation, so it is necessary to measure the opening formation position with high precision. Furthermore, because openings need to be formed in multiple steel foundations, there is a risk of reducing work efficiency if the opening formation position is measured one by one with a ruler and marked.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide an opening positioning jig and an opening forming method that can improve work efficiency and achieve accurate positioning. [Means for solving the problem]

[0007] The above problem is solved by the opening positioning jig of the present invention, which is attached to the outer surface of a base that is connected to an anchor bolt fixed to a foundation, and is used to form an opening that exposes the anchor bolt in the base, the opening positioning jig having a plate-shaped base portion that is arranged opposite the outer surface of the base, a guide hole that is formed through the base portion and is used to form the opening in the base, and an attachment portion that detachably attaches the base portion to the base, and the guide hole is formed at a position in the base portion that corresponds to the opening when the base portion is attached to the base by the attachment portion.

[0008] With the above-described configuration, the opening positioning jig can be easily attached to and detached from the base, and the guide holes formed at positions corresponding to the openings allow the openings to be formed at positions with high precision. Therefore, the work efficiency can be improved and the alignment can be performed with high precision.

[0009] In this case, the base portion has an extension portion that extends from the longitudinal end of the base portion in the thickness direction of the base portion and is positioned opposite the side of the base, and the mounting portion is a permanent magnet that can be attached to the steel base and is provided on the inner surface of the extension portion. With the above configuration, the extension portion is attached to the side surface of the steel base by a permanent magnet, so that the base portion can be prevented from shifting in position relative to the steel base.

[0010] In this case, the opening positioning jig is used to mark the formation position of the opening, and the guide hole has a central hole that is formed corresponding to the center of the formation position when the base part is attached to the base by the mounting part, and a tapered central guide surface that slopes from the surface of the base part toward the central hole is formed on the periphery of the central hole in the base part. With the above configuration, the central guide surface allows the pen tip of the marking writing implement to be easily aligned with the central hole.

[0011] In this case, the opening positioning jig is used to mark the formation position of the opening, and the guide hole has a central hole formed corresponding to the center of the formation position when the base portion is attached to the base by the mounting portion, and an outer peripheral hole formed corresponding to the outer periphery of the formation position, and the outer peripheral holes may be multiple long holes formed along the outer periphery of the formation position. With the above configuration, the outer peripheral hole is made up of a plurality of elongated holes, which makes it possible to easily mark the base member while preventing a decrease in strength of the base member.

[0012] In this case, it is preferable that an inner edge of the outer peripheral hole in the base portion is formed with a tapered outer peripheral guide surface that is inclined from the surface of the base portion toward the outer peripheral hole. With the above configuration, the outer peripheral guide surface allows the pen tip of the marking writing implement to be easily aligned with the outer peripheral hole.

[0013] The above problem is solved by the opening formation method of the present invention, which forms an opening in a base using an opening positioning jig attached to a base that is connected to an anchor bolt fixed to a foundation, and includes an attachment step of attaching the opening positioning jig to the outer surface of the base, a marking step of marking a formation position of the opening on the outer surface of the base, and an opening formation step of forming the opening that exposes the anchor bolt in the base, wherein in the marking step, the formation position is marked on the outer surface of the base via a guide hole formed in the opening positioning jig at a position corresponding to the opening, and in the opening formation step, the opening positioning jig is removed and the opening is formed at the marked formation position. With the above-described configuration, the opening positioning jig can be easily attached to and detached from the base, and the guide holes formed at positions corresponding to the openings allow the openings to be formed at positions with high precision. Therefore, the work efficiency can be improved and the alignment can be performed with high precision.

[0014] In this case, in the attaching step, the lower end of the opening positioning jig may be attached to the lower end of the base, so that the formation position and the position of the guide hole correspond to each other. With the above configuration, by aligning the lower end of the opening positioning jig with the lower end of the base, marking can be performed with high precision even when the upper end of the base is difficult to see due to the exterior wall panel. [Effects of the Invention]

[0015] According to the opening positioning jig and opening forming method of the present invention, it is possible to improve work efficiency and perform positioning with high precision. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a diagram showing the state before the opening positioning jig of the first embodiment is attached to the steel base. [Figure 2] FIG. 10 is a diagram showing the state when the opening positioning jig is attached to the steel base. [Figure 3] FIG. 10 is a cross-sectional view showing the state when the opening positioning jig is attached to the steel base. [Figure 4] FIG. 10 is a view showing the state when the opening positioning jig is removed from the steel base. [Figure 5] This is a diagram showing the state after an opening is formed in the steel base and it is jacked up. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] 1A to 1C are process diagrams of an opening forming method. [Figure 10] FIG. 10 is a perspective view of an opening positioning jig according to a second embodiment. [Figure 11] FIG. 10 is a perspective view of an opening positioning jig according to a third embodiment. [Figure 12] FIG. 10 is a view showing the state when the opening positioning jig of the fourth embodiment is attached to a steel base. [Figure 13] FIG. 10 is a diagram showing the state when the opening positioning jig of the fourth embodiment is attached to a steel foundation at the corner of a building. [Figure 14] FIG. 10 is a perspective view of an opening positioning jig according to a fourth embodiment. [Figure 15] FIG. 10 is a rear view of the opening positioning jig of the fourth embodiment. [Figure 16] FIG. 13 is a perspective view of an opening positioning jig according to a fifth embodiment. [Figure 17] FIG. 13 is a rear view of the opening positioning jig of the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] An opening positioning jig 1 according to one embodiment of the present invention (hereinafter referred to as this embodiment) will be described below with reference to FIGS. In the following description, as shown by the arrow in Figure 1, the "up-down direction" refers to the vertical direction of the building. The "front-rear direction" refers to the installation direction in which the opening positioning jig 1 is installed on the steel base F, with the front side of the opening positioning jig 1 being the front side and the back side of the opening positioning jig 1 being the rear side. The "horizontal direction" corresponds to the longitudinal direction of the steel base F and the opening positioning jig 1.

[0018] <Opening positioning jig of the first embodiment> As shown in Figure 1, the opening positioning jig 1 is attached to the outer surface of a steel base F that is connected to an anchor bolt A fixed to a foundation B. The opening positioning jig 1 is a jig for forming an opening H in the steel base F that exposes the anchor bolt A. 2, the opening positioning jig 1 is used to mark a formation position P of an opening H on a steel base F. As will be described later, the opening positioning jig 1 is provided with a guide hole 20 for marking the formation position P on the steel base F. An operator can attach the opening positioning jig 1 to the steel base F and mark the formation position P on the outer surface of the steel base F with high precision via the guide hole 20.

[0019] First, the steel base F will be explained. As shown in Figure 3, the steel foundation F is a foundation that connects to anchor bolts A buried in foundation B, and supports the building body (construction panels, column members, etc.) from below. The steel foundation F is a steel member that has a horizontally long rectangular parallelepiped shape and is open at the rear. The steel foundation F is placed on top of foundation B and connected to foundation B by nuts N of anchor bolts A. The building body is placed above the steel foundation F. Specifically, the panel frame W1 of the exterior wall panel W is attached to the top surface of the steel foundation F. A single building is provided with multiple steel foundations F. Square steel foundations Fc are provided at the corners of the building. Note that the foundation on which the opening positioning jig 1 is attached is not limited to a steel foundation, and may be a foundation made of other metals, a wooden foundation, or the like.

[0020] Anchor bolt A is buried in foundation B, which may be a continuous footing, and extends upward from foundation B to be inserted into steel base F. Nut N of anchor bolt A is covered by the outer surface of steel base F. During construction of a building, workers operate nut N from the indoor side of the building. When repairing differential settlement, workers operate the nuts N from the outside of the building. For this reason, openings H are formed on the outer surface of the steel foundation F to expose the nuts N of the anchor bolts A. Specifically, the openings H are formed in the parts of the outer surface of the steel foundation F that cover the nuts N of the anchor bolts A. In other words, the parts that cover the nuts N of the anchor bolts A are the formation positions P of the openings H.

[0021] As shown in Figure 4, a forming position P is marked on the steel base F via a guide hole 20 in the opening positioning jig 1. The worker forms the opening H by bringing the hole saw S into contact with this marked forming position P. By using the opening positioning jig 1, the worker can easily mark the forming position P. Therefore, there is no need to measure and mark the forming position P for each steel base F with a ruler, and the opening H can be formed with high precision while improving work efficiency.

[0022] As shown in FIG. 5, opening H is a circular opening for exposing anchor bolt A. Opening H is formed in a portion that covers nut N of anchor bolt A. By forming opening H in steel foundation F, anchor bolt A is exposed to the outside of the building. Note that the shape of opening H is not limited to a circle, and it may be an ellipse, a polygon, or the like. When repairing differential settlement, a worker can operate the nut N of the anchor bolt A through the opening H formed in the steel foundation F. The worker can insert a tool through the opening H and loosen the nut N of the anchor bolt A to release the connection between the foundation B and the steel foundation F. The worker then jacks up the building body with the jacking device J until it is level, and inserts a liner (not shown) between the foundation B and the steel foundation F. The worker then tightens the anchor bolt A to fasten the foundation B and the steel foundation F together. The anchor bolt A may be extended by using a high nut.

[0023] As shown in Figures 6 to 8, the opening positioning jig 1 is a resin member that has a U-shape when viewed from above. The opening positioning jig 1 has a plate-shaped base portion 10 that is arranged opposite the outer surface of the steel base F, a guide hole 20 for forming an opening H in the steel base F, a pair of extension portions 30 that extend rearward from both longitudinal ends of the base portion 10, and an attachment portion 40 that detachably attaches the base portion 10 to the steel base F. Two guide holes 20 are formed in the base portion 10 to align with the positions of the anchor bolts A (the formation positions P of the openings H).

[0024] The base portion 10 is a long, plate-like member extending horizontally. When the opening positioning jig 1 is attached to the steel base F by the attachment portion 40, the base portion 10 is positioned facing the outer surface of the steel base F. In other words, the surface of the base portion 10 opposite the surface 10a becomes the opposing surface 10b that faces the outer surface of the steel base F. The base portion 10 is formed with a guide hole 20 that penetrates the base portion 10 in the thickness direction.

[0025] The guide hole 20 is a hole for marking the formation position P of the opening H on the steel base F, and is formed through the base portion 10. The guide hole 20 is formed at a position in the base portion 10 that corresponds to the opening H when the base portion 10 is attached to the steel base F by the attachment portion 40. The guide hole 20 has a central hole 21 formed corresponding to the center of the formation position P, and an outer peripheral hole 22 formed corresponding to the outer periphery of the formation position P. In this embodiment, two anchor bolts A are exposed from the steel base F, and therefore two positions P for forming the openings H are marked. Therefore, two guide holes 20 (two central holes 21 and two outer peripheral holes 22) are formed in the base portion 10. Note that the positions of the central holes 21 and the outer peripheral holes 22 only need to be formed to correspond to the positions of the nuts N of the anchor bolts A (positions P for forming the openings H), and the shape, number, positions, etc. are not limited to this.

[0026] The central hole 21 is a circular hole formed at a position corresponding to the center of the formation position P of the opening H in the base portion 10. The central hole 21 is formed to a size (for example, a hole diameter of about 1 mm to 5 mm) that allows the pen tip of a marking writing implement M to be inserted therethrough. Two central holes 21 are formed at a predetermined interval in the horizontal direction. After marking the center of the forming position P through the central holes 21, the worker uses this marking as a guide and abuts the shank (center) of the hole saw S against the steel base F.

[0027] 7, a tapered central guide surface 10c that slopes from the surface 10a of the base portion 10 toward the central hole 21 is formed around the periphery of the central hole 21 in the base portion 10. In other words, the central guide surface 10c is a recess formed in the surface 10a of the base portion 10 around the periphery of the central hole 21, and is a tapered surface that decreases in diameter from the surface 10a to the opposing surface 10b. In this way, the central guide surface 10c makes it easy to align the pen tip of the marking writing instrument M with the central hole 21.

[0028] The peripheral holes 22 are circular holes formed at positions corresponding to the outer periphery of the formation position P of the opening H in the base portion 10. In other words, the peripheral holes 22 are a plurality of elongated holes 22a formed along the outer periphery of the formation position P. The peripheral holes 22 are formed to a size that allows the pen tip of the marking writing implement M to be inserted therethrough (for example, the width of the elongated holes 22a is approximately 1 mm to 5 mm, and the length is approximately 3 mm to 150 mm). In this embodiment, five elongated holes 22a are arranged at predetermined intervals to correspond to the outer periphery of the formation position P. Two outer peripheral holes 22 are formed at a predetermined interval in the horizontal direction. After marking the outer periphery of the forming position P via the outer peripheral holes 22, the worker uses this marking as a guide and brings the cutting edge of the hole saw S into contact with the steel base F.

[0029] 7, a tapered outer circumferential guide surface 10d is formed on the inner edge of the outer circumferential hole 22 in the base portion 10, sloping from the surface 10a of the base portion 10 toward the outer circumferential hole 22. In other words, the outer circumferential guide surface 10d is a recess formed in the surface 10a of the base portion 10 on the inner edge of the outer circumferential hole 22, and is a tapered surface that slopes from the surface 10a toward the opposing surface 10b toward the outer circumferential hole 22. In this way, the outer circumferential guide surface 10d makes it easy to align the pen tip of the marking writing instrument M with the outer circumferential hole 22.

[0030] 7, the outer edge of the outer peripheral hole 22 is not inclined, so that the outer peripheral hole 22 can be formed at the upper end of the base portion 10. Therefore, the base portion 10 can be made compact. In this embodiment, the upper end of the outer peripheral hole 22 is formed at the upper end of the base portion 10, but the upper end of the outer peripheral hole 22 may be formed in the central portion of the base portion 10. In this case, an outer peripheral guide surface 10d may be provided on the outer edge of the outer peripheral hole 22.

[0031] The extension portion 30 is a plate-like member that extends from both longitudinal ends of the base portion 10 in the thickness direction (rearward) of the base portion 10. When the opening positioning jig 1 is attached to the steel base F, the extension portion 30 is positioned opposite the side surface of the steel base F. In other words, the inner surface of the extension portion 30 becomes the attachment surface 30a that faces the side surface of the steel base F. The mounting surface 30a of the extension portion 30 has a recess 30b formed therein, recessed toward the outside of the extension portion 30. The mounting portion 40 (specifically, a permanent magnet) is disposed in the recess 30b. Two recesses 30b are formed in each extension portion 30. The recesses 30b in one extension portion 30 are arranged vertically side by side.

[0032] The distance between the pair of extensions 30 is the same as the longitudinal length of the steel base F. In other words, simply by attaching the opening positioning jig 1 to the steel base F, the opening positioning jig 1 can be easily positioned in the horizontal direction. When the horizontal position of the opening positioning jig 1 is adjusted using the extension portion 30, it is sufficient that one extension portion 30 extends rearward from at least one longitudinal end of the base portion 10. It is also possible that no extension portion 30 is provided. In this case, it is sufficient that the longitudinal length of the base portion 10 is the same as the longitudinal length of the steel base F.

[0033] The mounting portion 40 is, for example, a circular permanent magnet, and is a member for mounting the opening positioning jig 1 to the steel base F. As shown in Fig. 7, the mounting portion 40 is mounted to the recessed portion 30b of the extension portion 30. One mounting portion 40 is disposed in each recessed portion 30b provided in the extension portion 30. At this time, the mounting portion 40 is attached to the recess 30b so that the surface of the permanent magnet is flush with the mounting surface 30a of the extension portion 30. In this way, the opening positioning jig 1 can be attached to the steel base F without any gaps. Therefore, the marking accuracy can be improved. The mounting portion 40 is not limited to a permanent magnet, and may be made of adhesive, screws, pins, etc., as long as it can be easily attached to and detached from the base. The mounting portion 40 may also be provided on the base portion 10.

[0034] The opening positioning jig 1 is attached to the steel base F from the front by the attachment part 40. At this time, the opening positioning jig 1 is attached so that its lower end is aligned with the lower end of the steel base F. Since the distance from the lower end of the steel base F to the forming position P is constant, by attaching the opening positioning jig 1 so that its lower end is aligned with the lower end of the steel base F, the forming position P (height position of the opening H) can be marked with high precision. In addition, since the distance from one end of the steel base F in the longitudinal direction to the formation position P is also constant, the formation position P (horizontal position of the opening H) can be marked with high precision simply by attaching one end of the opening positioning jig 1 to one end of the steel base F.

[0035] <Aperture formation method> Here, we will explain an opening formation method for forming an opening H in a steel base F using the opening positioning jig 1. As shown in Figure 9, the opening formation method includes an "attaching step (S1)" for attaching the opening positioning jig 1 to the outer surface of the steel base F, a "marking step (S2)" for marking the formation position P of the opening H on the outer surface of the steel base F, and an "opening formation step (S3)" for forming an opening H in the steel base F to expose the anchor bolt A. Note that explanations of steps other than those mentioned above in processing the opening H will be omitted.

[0036] In the "attachment step (S1)," as shown in FIG. 1 , the worker attaches the opening positioning jig 1 to the outer surface of the steel base F. Specifically, the worker attaches the opening positioning jig 1 to the steel base F so that the opposing surface 10b of the base portion 10 faces the outer surface of the steel base F and the attachment surface 30a of the extension portion 30 faces the side surface of the steel base F. The attachment portions 40 provided on the pair of extension portions 30 are magnetically attached to the steel base F, allowing the opening positioning jig 1 to be detachably attached to the steel base F. Furthermore, it is possible to prevent the opening positioning jig 1 from becoming misaligned with respect to the steel base F. Before the "attaching step (S1)", chipping work may be performed on the foundation B to form a recess into which the jack device J is inserted. Also, the anchor bolt A may be partially exposed by chipping work.

[0037] When attaching the opening positioning jig 1 to the outer surface of the steel base F, the worker positions the guide hole 20 so that it corresponds to the formation position P of the steel base F. Specifically, the worker attaches the opening positioning jig 1 by aligning the lower end of the opening positioning jig 1 with the lower end of the steel base F, thereby aligning the formation position P of the opening H with the position of the guide hole 20. In this way, by aligning the lower end of the opening positioning jig 1 with the lower end of the steel base F, the position of the opening positioning jig 1 can be aligned with high precision even when the upper end of the steel base F is difficult to see due to the exterior wall panel W.

[0038] In the "marking process (S2)", as shown in FIG. 2, the worker marks the forming position P on the outer surface of the steel base F via a guide hole 20 formed at a position corresponding to the opening H in the opening positioning jig 1. Specifically, the worker marks the center of the forming position P at two locations on the outer surface of the steel base F via a center hole 21. The worker also marks the outer periphery of the forming position P at two locations on the steel base F via an outer periphery hole 22. At this time, the central guide surface 10c guides the pen tip of the marking writing instrument M into the central hole 21. Furthermore, the outer peripheral guide surface 10d guides the pen tip of the marking writing instrument M into the outer peripheral hole 22. Therefore, the worker can easily insert the pen tip of the marking writing instrument M into the central hole 21 or the outer peripheral hole 22 and perform marking.

[0039] In the "opening forming step (S3)," as shown in FIG. 4, the worker forms an opening H in the steel base F to expose the nut N of the anchor bolt A. Specifically, the worker removes the opening positioning jig 1 and forms the opening H at the marked forming position P. More specifically, the worker abuts the shank of the hole saw S against the center of the marked forming position P via the central hole 21 of the opening positioning jig 1. Then, the worker forms the opening H in the steel base F via the outer peripheral hole 22 of the opening positioning jig 1 so that the cutting edge of the hole saw S does not protrude beyond the outer periphery of the marked forming position P. In this way, the worker can form an opening H in the steel foundation F so that the nut N of the anchor bolt A is exposed, as shown in Figure 5. Since multiple steel foundations F are installed for one building, the worker repeats this process to mark each of the multiple steel foundations F and form an opening H in each of the multiple steel foundations F.

[0040] In this way, the opening positioning jig 1 can be easily attached to and detached from the steel base F, and the guide hole 20 formed at the position corresponding to the opening H allows the formation position P of the opening H to be aligned with high precision. Therefore, the work efficiency can be improved and the alignment can be performed with high precision.

[0041] <Opening positioning jig of second embodiment> Next, an opening positioning jig 101 according to a second embodiment will be described with reference to FIG. Note that a description of the same contents as those of the above-described opening positioning jig 1 will be omitted. The opening positioning jig 101 differs mainly in the configuration of the extension portion 130.

[0042] 10 , the opening positioning jig 101 has an L-shape in top view and a plate-like base portion 110 arranged opposite the outer surface of the steel base F, a guide hole 120 for forming an opening H in the steel base F, an extension portion 130 extending rearward from one longitudinal end of the base portion 110, and an attachment portion 140 for detachably attaching the base portion 110 to the steel base F. Two guide holes 120 are provided in the base portion 110.

[0043] The extension portion 130 is a plate-like member that extends from one longitudinal end of the base portion 110 in the thickness direction (rearward) of the base portion 110. When the opening positioning jig 101 is attached to the steel base F, the extension portion 130 is positioned opposite one side surface of the steel base F. In this way, the opening positioning jig 101 can be attached by hooking it onto the steel base F using the extension part 130 provided at one end. Therefore, the opening positioning jig 101 can be easily attached to and detached from the steel base F.

[0044] <Opening positioning jig of the third embodiment> Next, an opening positioning jig 201 according to a third embodiment will be described with reference to FIG. Note that a description of the same contents as those of the above-described opening positioning jig 1 and opening positioning jig 101 will be omitted. The opening positioning jig 201 differs mainly in the configuration of the guide holes 220.

[0045] 11 , the opening positioning jig 201 has an L-shape in top view and includes a plate-like base portion 210 arranged opposite the outer surface of the steel base F, a guide hole 220 for forming an opening H in the steel base F, an extension portion 230 extending rearward from one longitudinal end of the base portion 210, and an attachment portion 240 for detachably attaching the base portion 210 to the steel base F. Four guide holes 220 are provided in the base portion 210.

[0046] The guide hole 220 has two first guide holes 220A formed on the upper side and two second guide holes 220B formed on the lower side. That is, the guide hole 220 has four central holes 221 formed corresponding to the center of the forming position P and four outer peripheral holes 222 formed corresponding to the outer periphery of the forming position P.

[0047] The central holes 221 of the first guide hole 220A and the second guide hole 220B are arranged vertically aligned. A tapered central guide surface 210c is formed on the periphery of each central hole 221. The lower end of the central guide surface 210c of the first guide hole 220A and the upper end of the central guide surface 210c of the second guide hole 220B are in contact with each other. The outer peripheral holes 222 of the first guide hole 220A and the second guide hole 220B are arranged so that their outer peripheries partially overlap. Specifically, the first elongated hole 222a of the first guide hole 220A and the second elongated hole 222b of the second guide hole 220B are formed to communicate with each other. A tapered outer peripheral guide surface 210d is formed on the inner edge of each outer peripheral hole 222. The outer peripheral guide surface 210d of the first guide hole 220A and the outer peripheral guide surface 210d of the second guide hole 220B are in contact with each other in the up-down direction.

[0048] In this way, because the guide holes 220 are arranged at the top and bottom, even if the opening positioning jig 201 is attached upside down, marking can be performed at the appropriate position without changing the height position of the guide holes 220. In particular, even if another structure is installed near the side of the steel base F and it is difficult to attach the opening positioning jig 201, by turning the opening positioning jig 201 upside down, it is possible to easily attach the opening positioning jig 201 to the steel base F while avoiding interference with the other structure. Therefore, one opening positioning jig 201 can be used to accommodate various states of the steel base F.

[0049] <Opening positioning jig of the fourth embodiment> Next, an opening positioning jig 301 according to a fourth embodiment will be described with reference to FIGS. Note that a description will be omitted of the same details as those of the above-described opening positioning jig 1, opening positioning jig 101, and opening positioning jig 201. The opening positioning jig 301 differs mainly in the configuration of the guide holes 320.

[0050] The opening positioning jig 301 is attached to the outer surface of a steel base F provided on the side of a building, as shown in Fig. 12. The opening positioning jig 301 can also be attached to the outer surface of a square steel base Fc provided at the corner of a building, as shown in Fig. 13. 14, the opening positioning jig 301 has a U-shape in top view and includes a plate-like base portion 310 arranged opposite the outer surface of the steel base F, a guide hole 320 for forming an opening H in the steel base F, a pair of extension portions 330 extending rearward from both longitudinal portions of the base portion 310, and an attachment portion 340 for detachably attaching the base portion 310 to the steel base F. Four guide holes 320 are provided in the base portion 310.

[0051] The guide holes 320 include general guide holes 320A for a steel base F (general use) provided on the side of the building, and corner guide holes 320B for a square steel base Fc (corner use) provided on the corner of the building. In other words, the guide holes 320 have four center holes 321 formed corresponding to the centers of the formation positions P. The characters "for general use" are formed on the surface 310a of the base portion 310 in correspondence with the general guide hole 320A. The characters "for corner use" are also formed on the surface 310a of the base portion 310 in correspondence with the corner guide hole 320B. When marking the outer surface of the steel base F, the worker can insert the nib of the writing implement M into the general guide hole 320A using the characters "for general use" as a guide. When marking the outer surface of the square steel base Fc, the worker can insert the nib of the writing implement M into the corner guide hole 320B using the characters "for corner use" as a guide.

[0052] The central holes 321 of the general guide hole 320A and the corner guide holes 320B are aligned horizontally. A tapered central guide surface 310c is formed around the periphery of each central hole 321. The central guide surface 310c of the general guide hole 320A and the central guide surface 310c of the corner guide hole 320B are in contact with each other horizontally. In this way, multiple guide holes 320 are formed corresponding to the locations where the steel base F will be installed, so that one opening positioning jig 301 can be used to accommodate various installation locations for the steel base F.

[0053] 15, base recesses 310d recessed toward the front are formed in the opposing surface 310b of the base portion 310. Mounting portions 340 are disposed in the base recesses 310d. Two base recesses 310d are formed on each side of the base portion 310, outside the center hole 321. The base recesses 310d are arranged vertically. In this way, the mounting portion 340 is attached to the base portion 310 and the extension portion 330, thereby improving the mounting strength of the opening positioning jig 1 to the steel base F. Therefore, it is possible to suppress positional deviation of the opening positioning jig 1 and improve the marking accuracy.

[0054] <Opening positioning jig of the fifth embodiment> Next, an opening positioning jig 401 according to a fifth embodiment will be described with reference to FIGS. It should be noted that the description of the same contents as those of the opening positioning jig 1, the opening positioning jig 101, the opening positioning jig 201 and the opening positioning jig 301 described above will be omitted.

[0055] 16, the opening positioning jig 401 has a plate-shaped base portion 410 arranged opposite the outer surface of the steel base F, a guide hole 420 for forming an opening H in the steel base F, and an attachment portion 440 for detachably attaching the base portion 410 to the steel base F. Two guide holes 420 are provided in the base portion 410.

[0056] The base portion 410 has a base main body portion 411 and extension portions 412 extending outward from both ends of the base main body portion 411 in the horizontal direction. The base main body 411 is a plate-like member extending in the horizontal direction, as shown in Fig. 16. The base main body 411 has a guide hole 420 formed therein.

[0057] The extension portion 412 is a plate-like member that extends horizontally in an elongated manner from the lower end of the base main body portion 411. As shown in Fig. 17, an extension recess 412a that is recessed toward the front side is formed on the opposing surface 410b of the extension portion 412. The attachment portion 440 is disposed in the extension recess 412a. In this way, since the mounting portion 440 is attached to the base portion 410, it is possible to make the opening positioning jig 1 compact. The length of the base portion 410 in the longitudinal direction is formed to be the same as the length of the steel base F in the longitudinal direction.

[0058] The guide hole 420 has two outer peripheral holes 422 formed to correspond to the outer periphery of the formation position P. The outer peripheral holes 422 are circular holes formed in the base portion 410 at positions corresponding to the outer periphery of the formation position P of the opening H. When the outer periphery of the forming position P is marked through the outer peripheral hole 422, the worker brings the cutting edge of the hole saw S into contact with the steel base F, using this marking as a guide.

[0059] In this embodiment, the marking process may be omitted, and the cutting edge of the hole saw S may be brought into contact with the steel base F using the outer peripheral hole 422 as a marker, while the opening positioning jig 401 remains attached to the steel base F. This allows the marking process to be omitted, thereby improving work efficiency.

[0060] In the above embodiment, the opening positioning jig and the opening forming method according to the present invention have been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof. In particular, the above-described embodiments are merely examples and do not limit the present invention. [Explanation of symbols]

[0061] 1, 101, 201, 301, 401 Opening positioning jig 10, 110, 210, 310, 410 base 10a, 310a surface 10b, 310b, 410b Opposite side 10c, 210c, 310c central guide surface 10d, 210d Outer periphery guide surface 310d base recess 411 Base body 412 Extension 412a Extension recess 20, 120, 220, 320, 420 guide hole 220A First guide hole 220B Second guide hole 320A General guide hole 320B Corner guide hole 21, 221, 321 center hole 22, 222, 422 outer hole 22a long hole 222a First long hole 222b Second long hole 30, 130, 230, 330 extension 30a Mounting surface 30b recess 40, 140, 240, 340, 440 Mounting part B. Basics Anchor bolt N nut W exterior wall panel W1 Panel Frame F Steel base Fc square steel base P formation position H opening M writing instrument S Hole Saw J Jack device

Claims

1. An opening positioning jig attached to an outer surface of a base coupled to an anchor bolt fixed to a foundation, for forming an opening that exposes the anchor bolt to the base, a plate-shaped base portion disposed opposite the outer surface of the base; a guide hole formed through the base portion for forming the opening in the base; an attachment portion that detachably attaches the base portion to the base; The opening positioning jig is characterized in that the guide hole is formed at a position corresponding to the opening in the base portion when the base portion is attached to the base by the attachment portion.

2. an extension portion extending from an end portion of the base portion in a thickness direction of the base portion and disposed opposite a side surface of the base; 2. The opening positioning jig according to claim 1, wherein the attachment portion is a permanent magnet that can be attached to the steel base, and is provided on an inner surface of the extension portion.

3. the opening positioning jig is used to mark the formation position of the opening, the guide hole has a center hole formed corresponding to the center of the formation position when the base portion is attached to the base by the attachment portion, 3. The opening positioning jig according to claim 1, wherein a tapered center guide surface is formed on the periphery of the center hole in the base portion, the tapered center guide surface being inclined from the surface of the base portion toward the center hole.

4. the opening positioning jig is used to mark the formation position of the opening, the guide hole has a central hole formed corresponding to the center of the forming position when the base portion is attached to the base by the attachment portion, and an outer peripheral hole formed corresponding to the outer periphery of the forming position, 3. The opening positioning jig according to claim 1, wherein the outer peripheral holes are a plurality of elongated holes formed along the outer periphery of the formation position.

5. 5. The opening positioning jig according to claim 4, wherein an inner edge of the outer peripheral hole in the base portion is formed with a tapered outer peripheral guide surface that slopes from the surface of the base portion toward the outer peripheral hole.

6. 1. An opening forming method for forming an opening in a foundation using an opening positioning jig attached to a foundation connected to an anchor bolt fixed to the foundation, an attachment step of attaching the opening positioning jig to an outer surface of the base; a marking step of marking the formation position of the opening on the outer surface of the base; an opening forming step of forming the opening to expose the anchor bolt to the foundation, In the marking step, the formation position is marked on the outer surface of the base through a guide hole formed in the opening positioning jig at a position corresponding to the opening; The opening forming method is characterized in that, in the opening forming step, the opening positioning jig is removed, and the opening is formed at the marked formation position.

7. The opening forming method according to claim 6, characterized in that in the mounting step, the lower end of the opening positioning jig is mounted by aligning it with the lower end of the base, thereby corresponding the forming position to the position of the guide hole.

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