Column base positioning jig, and column base positioning method using the column base positioning jig

Abstract

To provide a column base positioning jig capable of positioning a column base at an appropriate position with respect to foundation of a building without a plumb bob, and a column base positioning method using the jig.SOLUTION: A column base positioning jig is used to position a column base B with respect to a column base foundation F1 when the column base B is fixed to the column base foundation F1. The column base positioning jig 10 has: a first reflection plate 12 which is provided at a position adjacent to a mark-off line B3 drawn on the upper face of a base plate B2 of the column base B in an extension direction at which the mark-off line B3 extends; a second reflection plate 13 which is provided above a ground mark F3 drawn on a foundation B, and reflects the ground mark F3 on the first reflection plate 12 so as to make the ground mark F3 observable from above the first reflection plate 12; a frame body 11 supporting the first reflection plate 12 and the second reflection plate 13; and an opening 11d which makes the mark-off line B3 observable from above, inside the frame body 11.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a column base positioning jig and a column base positioning method using the column base positioning jig, and more particularly to a column base positioning jig used to position a column base relative to a foundation and a column base positioning method using the column base positioning jig. [Background technology]

[0002] The lower end of a column is called the column base, and is firmly fixed to the foundation, which is the substructure, in order to support a building. Conventionally, a method called the "exposed type" has been widely used, in which the column base is fixed to the foundation by connecting an anchor bolt buried in the foundation with a base plate fixed to the column base. To explain how exposed type column bases are fixed, the base plate has an assembly hole through which the anchor bolt can be inserted, and the column base is assembled to the foundation via the base plate by inserting the anchor bolt into the assembly hole and fastening it. At this time, positioning work for the column base is required to fix the column base in the correct position.

[0003] Generally, when positioning construction components, a positioning jig called a plumb bob is used. A plumb bob has a string and an inverted cone-shaped weight attached to the end of the string. The base end of the string is attached to the column base, and the positional deviation between the tip of the weight and the ground mark drawn on the foundation can be visually confirmed to position the column base. Patent Document 1 describes the use of a plumb bob in the positioning work of a partition runner, and Patent Document 2 describes the use of a plumb bob in the positioning work of an anchor frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-100926 [Patent Document 2] Japanese Patent Application Publication No. 05-141095 Summary of the Invention [Problem to be solved by the invention]

[0005] As described in Patent Documents 1 and 2, by using a plumb bob, it is possible to easily position the construction member located above with respect to the marking line drawn below. However, when using a plumb bob to position the column base relative to the foundation, the following problems have been pointed out. The work of positioning the column base relative to the foundation had to be done in a limited space, and it was sometimes difficult to grasp the positional relationship between the bottom end of the plumb bob and the ground mark drawn on the foundation. Also, the ground mark was drawn in a location surrounded by the foundation structure, which made it difficult to see. Furthermore, because the work of positioning the column base relative to the foundation was done outdoors, the influence of the wind caused the plumb bob to swing, which reduced workability.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a column base positioning jig that can position a column base in an appropriate position relative to the foundation without using a plumb bob, and a column base positioning method using the column base positioning jig. [Means for solving the problem]

[0007] The above problem is solved by the column base positioning jig of the present invention, which is a column base positioning jig used to position a column base relative to a foundation when fixing the column base to the foundation, and which comprises a first reflector arranged at a position adjacent to a marking line drawn on the upper surface of the base plate of the column base in the extension direction of the marking line, a second reflector arranged above the ground marking line drawn on the foundation and reflecting the ground marking line onto the first reflector so that it can be observed from above the first reflector, a frame body supporting the first reflector and the second reflector, and an observation window inside the frame body through which the marking line can be observed from above.

[0008] According to the above configuration, the marking line drawn on the foundation is projected onto the first reflector via the second reflector. The first reflector is installed in a position adjacent to the marking line drawn on the top surface of the base plate. This allows the worker to check the position of the column base relative to the foundation by observing the marking line drawn on the top surface of the base plate and the marking line projected on the first reflector from above, and adjust the position of the column base. This makes it possible to position the column base in the appropriate position relative to the foundation without using a plumb bob.

[0009] Furthermore, instead of observing the positional relationship between the marking line and the ground mark from the side as is the case when using a plumb bob, it is possible to observe it from above, making it possible to perform positioning work within a limited space. Furthermore, even if visibility is reduced because the ground mark is drawn in a location surrounded by foundation structures, visibility can be improved by projecting the ground mark onto the first reflector attached to the top surface of the base plate. Furthermore, since no plumb bob is used, it is possible to avoid the influence of wind reducing the workability of the positioning work.

[0010] The frame may support the first reflecting plate and the second reflecting plate such that their respective reflecting surfaces face each other in parallel. With the above configuration, the marking line on the foundation can be observed from directly above the marking line via the first and second reflectors. Therefore, even if the space on the sides of the column base is limited and the marking line and marking line cannot be observed from the side, it is possible to check the positional deviation of the column base relative to the foundation from directly above, and to position the column base in the appropriate position relative to the foundation.

[0011] Preferably, a permanent magnet is attached below the frame body to detachably attach the frame body to the upper surface of the base plate. According to the above configuration, the column base positioning jig can be attached to the upper surface of the base plate, thereby improving stability when the column base positioning jig is attached.

[0012] In addition, the frame body may have an upper surface abutment portion that abuts against the upper surface of the base plate, and a side surface abutment portion that extends downward from the upper surface abutment portion and has a flat surface that abuts against the side surface of the base plate. According to the above configuration, by abutting the upper surface abutment portion and the side surface abutment portion against the upper surface and side surface of the base plate, the column base positioning jig can be easily attached to the appropriate position on the base plate.

[0013] The observation window may be an opening that passes through the frame in the vertical direction. According to the above configuration, it is possible to suppress an increase in the number of parts of the column base positioning jig.

[0014] In addition, the column base positioning jig may preferably have a lighting device that illuminates at least one of the ground mark and the marking line projected onto the first reflector. According to the above configuration, visibility can be improved by illuminating at least one of the ground mark and the marking line with a lighting device, making it possible to easily check the positional deviation of the column base relative to the foundation.

[0015] Furthermore, the above-mentioned problem is solved by a column base positioning method of the present invention, which, when fixing a column base to a foundation, positions the column base with respect to the foundation using a column base positioning jig, comprising: an assembly step of assembling the column base to the foundation by inserting anchor bolts provided in the foundation into assembly holes formed in a base plate of the column base; a jig attachment step of attaching the column base positioning jig so that a first reflector of the column base positioning jig is positioned adjacent to a scribe line drawn on the upper surface of the base plate in the extension direction of the scribe line; a position deviation measurement step of measuring, from above the column base positioning jig, a position deviation of the column base based on the scribe line and the ground mark reflected on the first reflector by a second reflector of the column base positioning jig positioned above the ground mark drawn on the foundation; and a position adjustment step of adjusting the position of the column base with respect to the foundation based on the position deviation measured in the position deviation measurement step.

[0016] According to the above configuration, the marking line drawn on the foundation is projected onto the first reflector by the second reflector. The first reflector is installed in a position adjacent to the marking line drawn on the upper surface of the base plate. This allows the worker to check the position of the column base relative to the foundation by observing the marking line drawn on the upper surface of the base plate and the marking line projected on the first reflector from above, and adjust the position of the column base. This makes it possible to position the column base in the appropriate position relative to the foundation without using a plumb bob. [Effects of the Invention]

[0017] According to the rotary jig of the present invention, it is possible to position the column base in the appropriate position relative to the foundation without using a plumb bob. [Brief explanation of the drawings]

[0018] [Figure 1] This is a perspective view showing the state before the column base is attached to the foundation of the building. [Figure 2] This is a perspective view showing the state after the column base has been assembled to the foundation of the building. [Figure 3] This is an oblique view showing the state in which the column base has been assembled to the foundation of a building and the column base positioning jig has been attached. [Figure 4] This is an oblique view of the column base positioning jig as seen from diagonally front. [Figure 5] This is an oblique view of the column base positioning jig seen from diagonally behind. [Figure 6] FIG. 10 is a top view of the column base positioning jig. [Figure 7] 10A and 10B are diagrams showing the flow of the column base positioning work using a column base positioning jig. [Figure 8] FIG. 1 is a side cross-sectional view of a column base positioning jig and a column base. [Figure 9] FIG. 1 is a top view of the column base positioning jig and the column base. [Figure 10] FIG. 10 is a perspective view showing a state of position adjustment using a position adjustment jig. [Figure 11] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] 1 to 11, a column base positioning jig 10 according to one embodiment of the present invention (hereinafter referred to as the present embodiment) and a column base positioning method using the column base positioning jig 10 will be described. However, the embodiment described below is merely an example to facilitate understanding of the present invention and does not limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and of course, the present invention also includes equivalents thereof.

[0020] <Outline of Foundation F and Column Base B> First, an outline of the foundation F of the building and the column base B fixed to the foundation F will be described with reference to FIGS. 1 to 3. As shown in FIGS. 1 and 2, the foundation F is composed of a column base foundation F1 to which the column base B is fixed, and a foundation beam F2 extending laterally from the column base foundation F1. The column base foundation F1 is a foundation structure that supports the column base B. Anchor bolts F1a and column supports F1b are embedded in the column base foundation F1 to assemble the column base B. The anchor bolts F1a and column supports F1b are used to assemble the column base B to the column base foundation F1. Furthermore, on the top surface of the column base foundation F1, there are drawn plumb lines F3 indicating the fixed position of the column base B. Specifically, four plumb lines F3 are drawn extending in all directions from the center of the column base foundation F1. The plumb lines F3 are used to position the column base B relative to the column base foundation F1. The method for positioning the column base B will be described later. The foundation beams F2 connect the column base foundations F1 to each other and support the building together with the column base foundations F1. The upper ends of the foundation beams F2 are located higher than the upper ends of the column base foundations F1.

[0021] The column base B is an exposed column base. Specifically, the column base B has a column B1 and a base plate B2 at the lower end of the column B1. The column B1 is a square steel pipe, but is not limited to this. The column B1 may also be a circular steel pipe. The base plate B2 is a plate-like body fixed to the lower end of the column B1 by welding. The base plate B2 is provided with an assembly hole B2a and an assembly frame (not shown). The assembly hole B2a penetrates the base plate B2 in the vertical direction and has a hole diameter larger than the diameter of the anchor bolt F1a embedded in the column base foundation F1. The assembly frame is provided in the center of the underside of the base plate B2 and has a shape corresponding to the column support F1b (shear metal) embedded in the column base foundation F1. Therefore, the column base B can be fixed to the column base foundation F1 via the base plate B2, as described below.

[0022] Four scribe lines B3 are drawn on the top surface B2c and side surface B2d of the base plate B2. Specifically, the scribe lines B3 extend vertically at the center of the side surface B2d of the base plate B2, and also extend in a direction (extension direction) toward the center on the top surface B2c of the base plate B2. The scribe lines B3 are used when positioning the column base B with respect to the column base foundation F1. The method for positioning the column base B will be described later.

[0023] When fixing the column base B to the column base foundation F1, the column base B is first suspended from above and lowered from above the column base foundation F1. Then, the column support F1b is attached to the assembly frame, and the anchor bolt F1a is inserted into the assembly hole B2a and fastened with the fastening nut F1c, thereby assembling the column base B to the column base foundation F1. Here, the diameter of the assembly hole B2a is larger than the diameter of the anchor bolt F1a. As a result, the column base B may be assembled to the column base foundation F1 in a position that is horizontally offset. More specifically, the column base B may be assembled in a position that is different from the appropriate position where the four ground marks F3 drawn on the column base foundation F1 and the four scribe lines B3 drawn on the base plate B2 overlap one another.

[0024] Conventionally, a plumb bob was hung from the marking line B3, and the positional relationship between the tip of the plumb bob and the ground mark F3 was observed to confirm whether the column base B was properly assembled relative to the column base foundation F1. However, as described above, the foundation beam F2 extends to the side of the column base foundation F1, and the upper end of the foundation beam F2 is located higher than the upper end of the column base foundation F1. In other words, the column base foundation F1 is surrounded by the foundation beam F2. Therefore, it was not possible to observe the tip of the plumb bob's weight and the ground mark F3 from the side, making it difficult to grasp the positional relationship between them. Furthermore, because the work was performed outdoors, the plumb bob's weight swayed in the wind, resulting in reduced workability and increased work man-hours.

[0025] Therefore, as shown in Figure 3, a column base positioning jig 10 is attached to the base plate B2, and the ground mark F3 and scribed line B3 can be observed from directly above via the column base positioning jig 10. As will be described in detail later with reference to Figures 4 to 6, the column base positioning jig 10 has a reflector that projects the ground mark F3 so that it can be observed directly above. This makes it possible to grasp the positional relationship between the ground mark F3 and the scribed line B3 by observing them from directly above, even when the column base foundation F1 is surrounded by foundation beams F2.

[0026] Furthermore, even if the area around the ground mark F3 is dark due to being surrounded by the foundation beam F2, reducing visibility, visibility can be improved by projecting the ground mark F3 onto the reflector of the column base positioning jig 10 attached to the upper surface B2c of the base plate B2. Furthermore, since no plumb bob is used, it is possible to avoid the influence of wind reducing the workability of the positioning work.

[0027] From the above, if it is found using the column base positioning jig 10 that the column base B has been assembled to the column base foundation F1 at a position other than the appropriate position, the column base B can be displaced to the appropriate position using the position adjustment jig 20, which will be described later with reference to Figures 9 and 10. Once the column base B is positioned at the appropriate position relative to the column base foundation F1, grout material (not shown) is injected between the column base foundation F1 and the column base B, and the column base B is fixed to the column base foundation F1.

[0028] <Column base positioning jig 10> Next, the column base positioning jig 10 will be described with reference to Figures 4 to 6. Figure 4 is a perspective view of the column base positioning jig 10 seen diagonally from the front, Figure 5 is a perspective view of the column base positioning jig 10 seen diagonally from the rear, and Figure 6 is a top view of the column base positioning jig 10 seen from above.

[0029] The column base positioning jig 10 has a frame body 11, a first reflecting plate 12, and a second reflecting plate 13 as its main components. The frame 11 has a rectangular shape when viewed from above (see FIG. 6), and supports a first reflecting plate 12 and a second reflecting plate 13 (described later) on a base plate B2. The frame 11 has a front surface 11a, a rear surface 11b, and left and right side surfaces 11c. The frame 11 is a molded body made of synthetic resin, but is not limited to this. The frame 11 may be made of metal or cardboard.

[0030] An upward extension 11a1 is formed at the upper end of the front surface 11a, extending upward from the upper end of the rear surface 11b. The upward extension 11a1 is angled upward and backward, and is inclined at a predetermined angle (e.g., 50 degrees) with respect to the vertical direction (see FIG. 8). The upward extension 11a1 supports a second reflecting plate 13, which will be described later, on its rear surface. Therefore, the second reflecting plate 13 is inclined backward at a predetermined angle (e.g., 50 degrees) with respect to the vertical direction.

[0031] A downward extension portion 11a2 is formed at the lower end of the front surface 11a, extending downward from the lower end of the rear surface 11b. The downward extension portion 11a2 connects the downward extension portions 11c1 formed on the left and right side surfaces 11c, improving the strength of the downward extension portions 11c1.

[0032] The rear surface 11b is a flat surface facing the front surface 11a. The rear surface 11b, together with the left and right side surfaces 11c, supports the first reflecting plate 12. Furthermore, a lower end portion 11b1 (see FIG. 5) of the rear surface 11b and rear lower end portions 11c3 of the left and right side surfaces 11c correspond to upper surface abutment portions that abut against the upper surface B2c of the base plate B2 when the column base positioning jig 10 is attached to the base plate B2.

[0033] The left and right side surfaces 11c face each other at a distance from each other and connect the front surface 11a and the rear surface 11b. A downward extension portion 11c1 is formed at the front lower end of the side surface 11c, extending downward from the lower end of the rear surface 11b. A rear end portion 11c2 of the downward extension portion 11c1 corresponds to a side surface abutment portion that abuts against the side surface B2d of the base plate B2 when the column base positioning jig 10 is attached to the base plate B2. The column base positioning jig 10 improves the stability of attachment to the base plate B2 by abutting the upper surface abutment portion and the side surface abutment portion against the upper surface B2c and the side surface B2d of the base plate B2. In order to improve the strength of the downward extending portions 11c1, a rear wall may be provided to connect the rear end portions 11c2 of the left and right downward extending portions 11c1.

[0034] As shown in Fig. 6, an opening 11d is formed in the frame body 11, penetrating the frame body 11 in the vertical direction. The opening 11d is located below the second reflecting plate 13. Therefore, as will be described later with reference to Figs. 8 and 9, the ground mark F3 drawn on the column base foundation F1 is reflected by the second reflecting plate 13 and projected onto the first reflecting plate 12. The opening 11d extends rearward from the upper end (rear end) of the upward extending portion 11a1. Therefore, as will be described later with reference to Figures 8 and 9, the worker can observe the scribe line B3 drawn on the base plate B2 from above. The opening 11d corresponds to an observation window.

[0035] The first reflecting plate 12 and the second reflecting plate 13 have a first reflecting surface 12a and a second reflecting surface 13a that enable the ground mark F3 drawn on the column base foundation F1 to be observed from above the column base positioning jig 10 when the column base positioning jig 10 is attached to the base plate B2. The first reflecting plate 12 and the second reflecting plate 13 have a glass transparent layer that transmits visible light and a silver reflective layer that covers the transparent layer and has excellent reflective properties for visible light. However, without being limited to this, the first reflecting plate 12 and the second reflecting plate 13 may also have an aluminum reflective layer.

[0036] The first reflecting plate 12 is provided at a position adjacent to the opening 11d. More specifically, the first reflecting plate 12 is provided at a position adjacent to the scribed line B3 in the extension direction of the scribed line B3 drawn on the upper surface B2c of the base plate B2 when the column base positioning jig 10 is attached to the base plate B2. Here, the extension direction is the direction indicated by arrow A in Figures 8 and 9, which is the direction toward the center of the upper surface B2c of the base plate B2. The first reflecting plate 12 has a first reflecting surface 12a tilted backward at a predetermined angle (50 degrees relative to the vertical direction). The first reflecting surface 12a faces a second reflecting surface 13a (described later) in parallel to each other.

[0037] The second reflecting plate 13 is provided on the rear surface of the upward extending portion 11a1 of the front surface 11a. As described above, the upward extending portion 11a1 and the second reflecting plate 13 are tilted backward at a predetermined angle (50 degrees in the up-down direction). As a result, the second reflecting surface 13a located on the rear side of the second reflecting plate 13 faces the first reflecting surface 12a at an angle that is parallel to each other.

[0038] <Method for positioning column base B using column base positioning jig 10> Next, a method for positioning the column base B relative to the column base foundation F1 will be described. Figure 7 shows the flow of work to position the column base B relative to the column base foundation F1. As shown in Figure 7, first, the column base B is assembled to the column base foundation F1 (step S10, assembly process). Specifically, a worker lifts the column base B using a lifting machine and lowers it onto the column base foundation F1. Then, the worker assembles the column support F1b of the column base foundation F1 into the assembly frame provided at the lower end of the base plate B2, and inserts the anchor bolt F1a into the assembly hole B2a and fastens it with the fastening nut F1c. In this way, the column base B is assembled to the column base foundation F1.

[0039] Next, the worker attaches the column base positioning jig 10 to the base plate B2 of the column base B (step S12, jig attachment step). Specifically, the lower end 11b1 of the rear surface 11b and the lower end 11c3 of the side surface 11c of the frame body 11 are placed on the upper surface B2c of the base plate B2, and the rear end 11c2 of the side surface 11c of the frame body 11 is abutted against the side surface B2d of the base plate B2. As a result, the opening 11d of the frame body 11 is positioned above the ground mark F3 drawn on the column base foundation F1 and the scribe line B3 drawn on the base plate B2.

[0040] Figure 8 shows a side cross-sectional view of the column base positioning jig 10 attached to the base plate B2. As shown in Figure 8, when the column base positioning jig 10 is attached to the base plate B2, the first reflecting surface 12a of the first reflecting plate 12 and the second reflecting surface 13a of the second reflecting plate 13 face each other in a parallel positional relationship. As a result, the ground mark F3 drawn on the column base foundation F1 is reflected by the second reflecting surface 13a located directly above the ground mark F3 and projected onto the first reflecting plate 12, and is also reflected directly upward by the first reflecting surface 12a. This makes it possible to observe the ground mark F3 from above the column base positioning jig 10. On the other hand, the scribed line B3 drawn on the base plate B2 can be observed from above through an opening 11d that passes through the frame body 11 in the vertical direction.

[0041] As a result, the worker can observe the ground mark F3 and the marking line B3 in a positional relationship adjacent to each other from directly above the column base positioning jig 10. In FIG. 8, the anchor bolts F1a and column supports F1b built into the column base foundation F1, and the assembly frame located below the base plate B2 are not shown.

[0042] Here, four ground marks F3 are drawn on the column base foundation F1, and four marking lines B3 are drawn on the base plate B2 (see Figure 1). Therefore, four column base positioning jigs 10 can be attached to the upper surface B2c of the base plate B2, but this is not limited to this. One column base positioning jig 10 may be attached to each of the four marking lines B3 in turn, and steps S14 and S16, which will be described later, may be repeated.

[0043] Next, the position deviation of the marking line B3 from the ground mark F3 is measured (step S14, position deviation measurement step). Specifically, the worker observes the ground mark F3 and the marking line B3 from above the column base positioning jig 10 and measures the position deviation between the marking line B3 and the ground mark F3 by eye.

[0044] Figure 9 is a top view of the base plate B2 and the column base positioning jig 10 attached to the upper surface B2c of the base plate B2. As shown in Figure 9, the ground mark F3 projected onto the first reflector 12 via the second reflector 13 and the marking line B3 via the opening 11d can be observed adjacent to each other. When the ground mark F3 and the marking line B3 are aligned in a straight line, the worker can determine that the column base B is positioned appropriately relative to the column base foundation F1. The worker can also measure the positional deviation of the column base B relative to the column base foundation F1 by visually estimating the positional deviation between the ground mark F3 and the marking line B3.

[0045] Here, it is preferable that the first reflector 12 is provided with a scale to assist in visually estimating the positional deviation between the ground mark F3 and the marking line B3. This allows the worker to measure with high precision the positional deviation of the column base B relative to the column base foundation F1 by comparing the positional deviation between the ground mark F3 and the marking line B3 with the scale.

[0046] 7, next, the worker operates the position adjustment jig 20 to adjust the position of the column base B relative to the column base foundation F1 (step S16, position adjustment step). Specifically, based on the position deviation amount measured in step S14, the worker adjusts the column base B so that it is positioned at an appropriate position relative to the column base foundation F1.

[0047] Fig. 10 is a diagram for explaining the position adjustment of the base plate B2 relative to the column base foundation F1. As shown in Fig. 10, a position adjustment jig 20 is attached between the foundation beam F2 and the base plate B2. More specifically, the position adjustment jig 20 is interposed between the side surface of the foundation beam F2 and the side surface B2d of the base plate B2. An operator can adjust the distance between the foundation beam F2 and the base plate B2 by operating the position adjustment jig 20 to change the length of the position adjustment jig 20, thereby making it possible to position the column base B in an appropriate position relative to the column base foundation F1.

[0048] Fig. 11 is a perspective view of the position adjustment jig 20. As shown in Fig. 11, the position adjustment jig 20 has a horizontal support portion 21, a vertical support portion 22, and a position adjustment portion 23 as its main components. The horizontal support part 21 and the vertical support part 22 are steel angle members. The horizontal support part 21 abuts against the upper surface of the foundation beam F2, and the vertical support part 22 abuts against the side surface of the foundation beam F2, so that the two parts can cooperate to support the position adjustment jig 20 relative to the foundation beam F2.

[0049] The position adjustment part 23 has an extension member 23a extending horizontally from the lower end of the vertical support part 22, and a position adjustment bolt 23c that is screwed into a threaded hole 23b formed inside the extension member 23a and protrudes from the tip side of the extension member 23a. The extension member 23a is a high nut with a threaded hole 23b formed therein, and is fixed to the vertical support part 22 by welding. The position adjustment bolt 23c is threaded into the screw hole 23b, so that an operator can change the amount of projection from the tip of the extension member 23a by rotating the head of the position adjustment bolt 23c.

[0050] The position adjustment jig 20 configured in this manner is attached between the foundation beam F2 and the base plate B2 as shown in Fig. 10. The worker adjusts the position of the column base B relative to the column base foundation F1 by rotating the head of the position adjustment bolt 23c to change the protrusion amount of the position adjustment bolt 23c based on the position deviation amount of the column base B measured in step S14.

[0051] This completes the positioning work of the column base B relative to the column base foundation F1. By using the column base positioning jig 10, the worker can confirm the position of the column base B relative to the column base foundation F1 by observing the ground line F3 and the scribe line B3 from directly above the column base positioning jig 10. This makes it possible to position the column base B in the appropriate position relative to the column base foundation F1 without using a plumb bob.

[0052] The above describes a column base positioning jig 10 according to one embodiment of the present invention and a column base positioning method using the column base positioning jig 10. However, the above-described embodiment is merely an example to facilitate understanding of the present invention and does not limit the present invention. In the above-described embodiment, the column base positioning jig 10 is described as being attached by being placed on the upper surface B2c of the base plate B2, but this is not limiting. The column base positioning jig 10 may have a permanent magnet below the frame body 11 that detachably attaches the frame body 11 to the upper surface B2c of the base plate B2. Specifically, a permanent magnet is attached below at least one of the rear surface 11b and the left and right side surfaces 11c of the frame body 11. This allows the column base positioning jig 10 to be stably attached to the upper surface B2c of the base plate B2, and makes it possible to prevent the column base positioning jig 10 from shifting laterally on the upper surface B2c of the base plate B2 or falling off the upper surface B2c.

[0053] The column base positioning jig 10 may also have a lighting device that illuminates the ground mark F3 or the marking line B3. As a specific example, an LED (Light Emitting Diode) may be provided inside the frame body 11 to illuminate downward, thereby brightly illuminating the ground mark F3. This brightly illuminates the ground mark F3, which is poorly visible due to being surrounded by the foundation beams F2, thereby improving the visibility of the ground mark F3 projected on the first reflector 12. As another specific example, an LED that brightly illuminates the marking line B3 may be provided inside the frame body 11, thereby brightly illuminating the marking line B3. This improves the visibility of the marking line B3 when viewed from above through the opening 11d.

[0054] In the above embodiment, the column base positioning jig 10 has been described as allowing the ground mark F3 and the marking line B3 to be observed from directly above the column base positioning jig 10, but this is not limited to this. A reflecting member may be provided above the column base positioning jig 10, making it possible to observe the ground mark F3 and the marking line B3 from any direction.

[0055] In the above-described embodiment, the first reflecting surface 12a and the second reflecting surface 13a are described as specularly reflecting surfaces, but are not limited to this. The first reflecting surface 12a and the second reflecting surface 13a may have any shape to improve the visibility of the mark F3. Furthermore, an optical element (e.g., a magnifying lens) to improve the visibility of the mark F3 may be provided together with the first reflecting surface 12a and the second reflecting surface 13a.

[0056] In the above-described embodiment, the scribe line B3 is described as being observable through the opening 11d that penetrates the frame body 11 in the vertical direction, but this is not limiting. The scribe line B3 may be observed through an optical element (for example, a magnifying lens) or the like that improves the visibility of the scribe line B3.

[0057] In the above-described embodiment, the positional deviation between the ground mark F3 and the scribe line B3 is measured by the operator by eye, but this is not limited to this. The positional deviation between the ground mark F3 and the scribe line B3 may be measured by photographing the ground mark F3 and the scribe line B3 with a photographing device such as a camera and inputting the acquired image data into an image analysis process.

[0058] In the above embodiment, the position adjustment jig 20 has been described as having the horizontal support portion 21, the vertical support portion 22, and the position adjustment portion 23, but the configuration of the position adjustment jig 20 is not limited to this. It is sufficient if the column base B can be adjusted to an appropriate position with respect to the column base foundation F1. [Explanation of symbols]

[0059] 10 Column base positioning jig 11 Frame 11a Front 11a1 Upper extension part 11a2 Downward extension 11b Rear 11b1 Lower end (top contact part) 11c side 11c1 Downward extension 11c2 Rear end (side contact part) 11c3 Lower end 11d Opening (observation window) 12 First reflector 12a First reflective surface 13 Second reflector 13a Second reflective surface 20 Position adjustment jig 21 Horizontal support 22 Vertical support 23 Position adjustment section 23a Extension member 23b screw hole 23c Position adjustment bolt B Column base B1 pillar B2 Base Plate B2a Assembly hole B2c top surface B2d side view B3 Scribing line F Basics F1 column base foundation F1a anchor bolt F1b Column support F1c Fastening nut F2 foundation beam F3 Ground mark

Claims

1. A column base positioning jig used to position a column base relative to a foundation when fixing the column base to the foundation, a first reflector provided at a position adjacent to the marking line in the extension direction of the marking line drawn on the upper surface of the base plate of the column base; a second reflector that is provided above the markings drawn on the foundation and that reflects the markings on the first reflector so that the markings can be seen from above the first reflector; a frame supporting the first reflector and the second reflector; A column base positioning jig characterized by having an observation window inside the frame body that allows the scribe line to be observed from above.

2. 2. The column base positioning jig according to claim 1, wherein the frame supports the first reflecting plate and the second reflecting plate such that their respective reflecting surfaces face each other in parallel.

3. 2. The column base positioning jig according to claim 1, wherein a permanent magnet is attached to the lower part of the frame body, for detachably attaching the frame body to the upper surface of the base plate.

4. The frame body is an upper surface abutment portion that abuts against the upper surface of the base plate; 2. The column base positioning jig according to claim 1, further comprising a side surface abutment portion extending downward from the upper surface abutment portion and abutting against a side surface of the base plate.

5. 2. The column base positioning jig according to claim 1, wherein the observation window is an opening that passes through the frame body in the vertical direction.

6. The column base positioning jig according to claim 1, characterized in that the column base positioning jig has an illumination device that illuminates at least one of the ground mark and the marking line that are projected onto the first reflector.

7. A column base positioning method for positioning a column base with respect to a foundation using a column base positioning jig when fixing the column base to the foundation, an assembly process of assembling the column base to the foundation by inserting anchor bolts provided in the foundation into assembly holes formed in a base plate of the column base; a jig mounting step of mounting the column base positioning jig so that a first reflecting plate of the column base positioning jig is positioned adjacent to a marking line drawn on the upper surface of the base plate in an extension direction of the marking line; a position deviation measurement process for measuring the position deviation of the column base from above the column base positioning jig based on the marking line and the marking line projected onto the first reflector by the second reflector of the column base positioning jig located above the marking line drawn on the foundation; a position adjustment step of adjusting the position of the column base relative to the foundation based on the position deviation measured in the position deviation measurement step.

Images