Column base position adjustment jig

Abstract

The present invention provides a column base position adjustment jig that allows for adjustment of the column base position relative to the column base foundation, even when a foundation beam is not provided. [Solution] The column base position adjustment jig 1 is used to adjust the horizontal position of the column base B relative to the column base foundation F1 by pushing forward the base plate B2, which is provided at the lower end of the column base B, with a crowbar T. The column base position adjustment jig 1 has an elongated shape and includes an anchor bolt contact member 2 that extends in the left-right direction and contacts the front side surfaces of the left and right anchor bolts F1a fixed to the column base foundation F1 on both sides in the longitudinal direction, thereby positioning the left and right anchor bolts F1a in the front-rear direction, and a connecting member 3 that is connected to the anchor bolt contact member 2 and has a rear end portion 31b that protrudes rearward from the base plate B2. The connecting member 3 has an upright wall 32 at its rear end portion 31b that supports the crowbar T from rearward to frontward when pushing the base plate B2 in the front-rear direction.

Description

Technical Field

[0001] The present invention relates to a column base position adjusting tool, and particularly to a column base position adjusting tool used for adjusting the position of a column base relative to a foundation.

Background Art

[0002] The lower end of a column is called a column base and is firmly fixed to a foundation, which is a substructure, to support a building. Conventionally, a method called "exposed type" that fixes the column base to the foundation by connecting an anchor bolt embedded in the foundation and a base plate fixed to the column base has become widespread. To explain the fixing method of the exposed type column base, the base plate is formed with assembly holes through which the anchor bolts can be inserted, and the column base is assembled to the foundation through the base plate by inserting the anchor bolts into the assembly holes and fastening them. At this time, in order to fix the column base at an accurate position, an operation of adjusting the position of the column base is required.

[0003] Patent Document 1 describes a position adjusting tool that can adjust the position of a column base relative to a foundation. The position adjusting tool described in Patent Document 1 is attached between the foundation and the column base and has an extension member whose protruding length from the foundation can be changed. An operator can align the column base by changing the extension length of the extension member relative to the foundation.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Although the position of the column base can be adjusted using the position adjustment jig described in Patent Document 1, further improvements were desired. Specifically, when adjusting the position of the column base using the position adjustment jig described in Patent Document 1, a foundation beam is required to attach the position adjustment jig, and there was a problem in that the position of the column base could not be adjusted from a direction in which a foundation beam was not provided.

[0006] The present invention has been made in view of the above problems, and the object of the present invention is to provide a column base position adjustment jig that can adjust the position of the column base relative to the column base foundation even when a foundation beam is not provided. [Means for solving the problem]

[0007] The aforementioned problem is solved by the column base position adjustment jig of the present invention, which is used to adjust the horizontal position of a column base relative to a column base foundation by pushing forward a base plate provided at the lower end of the column base with a pushing tool, comprising: an anchor bolt contact member having a long shape and extending in the left-right direction, which is positioned in the front-rear direction relative to the left and right anchor bolts fixed to the column base foundation on both sides in the longitudinal direction when it comes into contact with the front sides of the left and right anchor bolts fixed to the column base foundation on both sides in the longitudinal direction; and a connecting member that is connected to the anchor bolt contact member and has a protruding portion that protrudes to the rear side of the base plate, wherein the connecting member has a tool support portion on the protruding portion that supports the pushing tool from rear to front when the base plate is pushed forward.

[0008] According to the above configuration, the column base position adjustment jig has an anchor bolt contact member that abuts against the front side of the anchor bolt and is positioned in the front-rear direction relative to the anchor bolt, and a protruding member that is connected to the anchor bolt contact member, extends in the front-rear direction and protrudes rearward from the base plate, and the protruding member has a tool support part that supports the pushing tool from rear to front. As a result, the base plate can be pushed forward by the pushing tool supported by the tool support part, so that the position of the column base relative to the column base foundation can be adjusted even if a foundation beam is not provided.

[0009] Furthermore, the anchor bolt contact member may have left and right displacement restricting members that contact the left and right anchor bolts on both sides in the longitudinal direction and restrict the left and right displacement of the left and right anchor bolts. With the above configuration, the displacement restricting member can restrict the left-right displacement of the column base position adjustment jig, allowing the column base position adjustment jig to be positioned appropriately and enabling the column base position adjustment work to be performed, thereby improving the work efficiency of the position adjustment work.

[0010] Furthermore, the anchor bolt contact member may have vertical walls that stand upright in the vertical direction and contact the left and right anchor bolts. According to the above configuration, the vertical wall increases the contact area between the column base position adjustment jig and the anchor bolt, allowing the column base position adjustment jig to be effectively positioned in the front-rear direction relative to the anchor bolt, and also preventing damage to the threads of the anchor bolt from being caused by the column base position adjustment jig.

[0011] Furthermore, it is preferable that the connecting member is connected to the anchor bolt contact member at the center of the anchor bolt contact member in the longitudinal direction. With the above configuration, the pushing tool can be positioned in the center in the left-right direction to push in the column base, making it possible to effectively adjust the position of the column base in the front-back direction.

[0012] Furthermore, it is preferable that the connecting member is connected to the anchor bolt contact member at a position deviated in the longitudinal direction from the longitudinal center of the anchor bolt contact member. With the above configuration, the push tool can be positioned at a location offset from the center in the left-right direction to push in the column base, making it possible to adjust the position of the column base while rotating it.

[0013] Furthermore, the connecting member may have a viewing window in its protruding portion that allows the ground mark drawn on the column base to be viewed from above the connecting member. With the above configuration, the position of the column base can be adjusted while viewing the ground markings through the viewing window, thereby improving the efficiency of the position adjustment work.

[0014] Furthermore, the tool support portion is an upright wall that protrudes upward from the connecting member, and the connecting member may have left and right reinforcing walls located at both ends of the upright wall in the left-right direction. According to the above configuration, the connection strength of the upright wall to the connecting part is improved, which strengthens the support force of the pushing tool by the upright wall. As a result, it becomes possible to effectively push the base plate with the pushing tool and adjust the position of the column base. [Effects of the Invention]

[0015] According to the column base position adjustment jig of the present invention, it is possible to adjust the position of the column base relative to the column base foundation even when a foundation beam is not provided. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view showing the state after the column bases have been assembled to the building's foundation. [Figure 2] This is a perspective view showing the building before the column bases are attached to the foundation. [Figure 3] This is a perspective view of a column base positioning jig. [Figure 4] This is a front view of the column base positioning jig. [Figure 5]This is a top view of the fixture for adjusting the position of the column base. [Figure 6] This is a side view of the fixture for adjusting the position of the column base. [Figure 7] This is a diagram showing the flow of the operation for adjusting the position of the column base. [Figure 8] This is a perspective view showing the state where the fixture for adjusting the position of the column base is attached to the column base foundation. [Figure 9] This is a partial perspective top view showing the state where the fixture for adjusting the position of the column base is attached to the column base foundation. [Figure 10] This is a diagram showing the state of pushing the column base using the fixture for adjusting the position of the column base.

Embodiment for Implementing the Invention

[0017] Hereinafter, referring to FIGS. 1 to 10, the fixture 1 for adjusting the position of the column base according to an embodiment of the present invention (hereinafter, this embodiment) will be described. However, the embodiment described below is merely an example for facilitating the understanding of the present invention and does not limit the present invention. That is, the present invention can be changed and improved without departing from its gist, and it is needless to say that the present invention includes its equivalents.

[0018] In the following description, the "front-rear direction" is the direction that coincides with the front-rear direction as seen from the operator who adjusts the position of the column base B with respect to the column base foundation F1 using the fixture 1 for adjusting the position of the column base, and is the same as the left-right direction in FIG. 6 which is a side view of the fixture 1 for adjusting the position of the column base. As will be described later, the column base B is pushed forward to adjust its position with respect to the column base foundation F1. Also, the "left-right direction" is the direction that coincides with the left-right direction as seen from the operator who adjusts the position of the column base B with respect to the column base foundation F1 using the fixture 1 for adjusting the position of the column base, and is the same as the left-right direction in FIG. 5 which is a top view of the fixture 1 for adjusting the position of the column base. Also, the "up-down direction" is the up-down direction of the column base foundation F1 and the column base B, and is the direction that coincides with the vertical direction.

[0019] <Overview of the Foundation F and the Column Base B> First, referring to FIGS. 1 and 2, the overview of the building foundation F and the column base B fixed to the foundation F will be described. As shown in Figures 1 and 2, the foundation F consists 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 support brackets F1b (see Figure 2) are embedded in the column base foundation F1. The anchor bolts F1a and column support brackets F1b are used to attach the column base B to the column base foundation F1.

[0020] Furthermore, ground markings F3 are drawn on the upper surface of the column base foundation F1 to indicate the fixed position of column base B. Specifically, four ground markings F3 are drawn extending in four directions from the center of the column base foundation F1. Ground markings F3 are used when adjusting the position of column base B relative to the column base foundation F1. The foundation beam F2 connects the column base foundations F1 and supports the building together with the column base foundations F1. The upper end of the foundation beam F2 is located above the upper end of the column base foundations F1. In Figures 1 and 2, the foundation beams F2 extend in opposite directions across the column base foundations F1, but the direction in which the foundation beams F2 extend is not limited to the directions shown in Figures 1 and 2.

[0021] Column base B is an exposed type column base. Specifically, column base B consists of column B1 and a base plate B2 located at the lower end of column B1. Column B1 is a square steel pipe. The base plate B2 is a steel plate 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 vertically 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 lower surface of the base plate B2 and has a shape that corresponds to the column support F1b (shear fitting) embedded in the column base foundation F1. Therefore, as will be explained below, the column base B can be fixed to the column base foundation F1 via the base plate B2.

[0022] Four marking lines B3 are drawn on the side B2b of the base plate B2. Specifically, the marking lines B3 extend vertically from the center of the side B2b of the base plate B2. Marking lines B3 are used when positioning the column base B relative to the column base foundation F1.

[0023] When fixing column base B to column base foundation F1, column base B is first suspended from above and lowered over column base foundation F1. Then, column support F1b is assembled to the assembly frame, and anchor bolts F1a are inserted through assembly holes B2a and fastened with fastening nuts F1c, thereby allowing column base B to be assembled to 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, column base B may be assembled in a position that is horizontally off-center relative to column base foundation F1. More specifically, it may be assembled in a position different from the correct position where the four ground markings F3 drawn on column base foundation F1 and the four marking lines B3 drawn on base plate B2 overlap vertically. Column base position adjustment jig 1 is used to adjust the position of column base B to the correct position relative to column base foundation F1 in such cases.

[0024] In conventional designs, position adjustment jigs were attached to the foundation beam F2. Therefore, as shown in Figures 1 and 2, it was not possible to adjust the position of column base B in the direction where the foundation beam F2 was not present, among the four directions facing the side of the column base foundation F1. In contrast, the column base position adjustment jig 1 of this embodiment is positioned relative to the anchor bolt F1a, allowing for adjustment of the horizontal position of column base B relative to the column base foundation F1 even when the foundation beam F2 is not present. Details of the column base position adjustment jig 1 will be described later.

[0025] <Column base position adjustment jig 1> Next, the column base position adjustment jig 1 will be described with reference to Figures 3 to 6. Figures 3, 4, 5, and 6 are perspective views, front view, top view, and side view, respectively, of the column base position adjustment jig 1 viewed from the diagonal front. The column base position adjustment jig 1 mainly consists of an anchor bolt contact member 2 and a connecting member 3.

[0026] <<Anchor bolt contact member 2>> The anchor bolt contact member 2 is a steel member having an elongated shape and contacting the left and right anchor bolts F1a on both sides in the longitudinal direction, as will be described later (see Figure 9). More specifically, the anchor bolt contact member 2 has a substantially L-shaped cross-section and has a horizontal portion 21 and an upright portion 22 that rises upward from the horizontal portion 21, and is positioned on the left and right anchor bolts F1a by extending in the left and right direction. The anchor bolt contact member 2 plays a role in positioning the column base position adjustment jig 1 relative to the anchor bolts F1a. The upright portion 22 corresponds to the vertical wall of the present invention.

[0027] Displacement restricting members 23 are provided at both ends in the longitudinal direction of the anchor bolt contact member 2. The displacement restricting member 23 is a plate-shaped member that extends rearward from the upright portion 22. As will be described later, the displacement restricting member 23 can restrict the displacement of the column base position adjustment jig 1 in the left-right direction by contacting the anchor bolt F1a (see Figure 9). This makes it possible to position the column base position adjustment jig 1 in the appropriate position and perform the position adjustment work on the column base B, thereby improving the workability of the position adjustment work.

[0028] <<Connecting Member 3>> The connecting member 3 is a steel member that extends in the front-rear direction and is connected perpendicularly to the anchor bolt contact member 2. More specifically, the connecting member 3 mainly consists of a connecting plate 31 that connects to the anchor bolt contact member 2, an upright wall 32 provided at the rear end 31b of the connecting plate 31, and left and right reinforcing walls 33.

[0029] The connecting plate 31 is welded and fixed to the anchor bolt contact member 2 at its front end 31a. On the other hand, the upright wall 32 is fixed to the rear end 31b of the connecting plate 31. By fixing the upright wall 32 to the rear end 31b of the connecting plate 31, it becomes possible to support the tip T1 of the crowbar T used to push the column base foundation F1 forward, from rear to front, as will be described later (see Figure 10). The upright wall 32 corresponds to the tool support part of the present invention.

[0030] Reinforcement walls 33 are provided at both the left and right ends of the upright wall 32. The left and right reinforcement walls 33 connect the connecting plate 31 and the upright wall 32, improving the connection strength of the upright wall 32 to the connecting plate 31. As shown in Figures 3 and 6, the reinforcement walls 33 have a right-angled triangular shape and are welded and fixed to the connecting plate 31 and the upright wall 32. However, the shape of the reinforcement walls 33 is not limited to a right-angled triangular shape. As long as the connection strength of the upright wall 32 to the connecting plate 31 is ensured, the reinforcement walls 33 may also be rectangular in shape.

[0031] Furthermore, the connecting plate 31 is connected to the anchor bolt contact member 2 at the center of the anchor bolt contact member 2 in the longitudinal direction. In other words, the connecting plate 31 is located at the center of the column base position adjustment jig 1 in the left-right direction. However, it is not limited to this, and the connecting plate 31 may also be connected to the anchor bolt contact member 2 at a position deviated in the longitudinal direction from the center of the anchor bolt contact member 2 in the longitudinal direction.

[0032] A viewing window 34 is formed at the rear end 31b of the connecting plate 31. The viewing window 34 is located at the center of the connecting plate 31 in the left-right direction. The viewing window 34 is a circular through-hole that penetrates the connecting plate 31 in the vertical direction, but the shape of the viewing window 34 is not limited to a circle. The viewing window 34 may be square or a slit-shaped elongated hole. By making the viewing window 34 a slit-shaped elongated hole, it becomes possible to easily check the positional deviation with respect to the ground mark F3 drawn on the column base foundation F1.

[0033] <Method for adjusting the position of column base B using column base position adjustment jig 1> Next, we will explain the method for adjusting the position of column base B relative to column base foundation F1. Figure 7 shows the workflow for adjusting the position of column base B relative to column base foundation F1. As shown in Figure 7, column base B is first assembled to column base foundation F1 (step S10). Specifically, the worker lifts column B1 using a lifting machine and lowers it onto column base foundation F1. The worker then assembles the column support F1b of column base foundation F1 to the assembly frame provided at the lower end of base plate B2, and inserts anchor bolts F1a through assembly holes B2a and fastens them with fastening nuts F1c. This completes the assembly of column base B to column base foundation F1.

[0034] Next, the worker attaches the column base position adjustment jig 1 to the column base foundation F1 (step S11). Specifically, the worker positions the column base position adjustment jig 1 between the column base foundation F1 and the base plate B2 of the column base B, and attaches it so that the anchor bolt contact member 2 contacts the left and right anchor bolts F1a.

[0035] Figures 8 and 9 show the column base position adjustment jig 1 attached to the column base foundation F1. As shown in Figures 8 and 9, the column base position adjustment jig 1 is located in the space formed between the column base foundation F1 and the base plate B2. At this time, the anchor bolt contact member 2 is positioned in the front-to-back direction, contacting the front sides of the bodies of the left and right anchor bolts F1a. Here, the upright portion 22 located at the rear end of the anchor bolt contact member 2 rises from the horizontal portion 21. Therefore, the anchor bolt contact member 2 contacts the anchor bolts F1a over a wider area, and damage to the threads of the anchor bolts F1a is suppressed. Furthermore, the displacement restricting members 23 located at both the left and right ends of the anchor bolt contact member 2 abut against the left and right sides of the body of the anchor bolt F1a. As a result, the left and right displacement of the column base position adjustment jig 1 is restricted.

[0036] The connecting member 3 extends in the front-rear direction, and the upright wall 32 provided at the rear end 31b of the connecting member 3 protrudes rearward from the rear end 31b of the base plate B2. In other words, a space is formed between the upright wall 32 and the rear side surface B2b of the base plate B2 in which a crowbar T, described later, can be placed. The rear end 31b corresponds to the protruding portion of the present invention.

[0037] Furthermore, the viewing window 34 penetrates the connecting member 3 in the vertical direction. As a result, the worker can view the ground mark F3 drawn on the column base foundation F1 through the viewing window 34, and adjust the position of the column base B while confirming its position relative to the column base foundation F1.

[0038] Next, the worker positions the crowbar T (step S12). Specifically, with the crowbar T held upright, the worker brings the tip T1 of the crowbar T into contact with the connection between the connecting plate 31 and the upright wall 32. Figure 10 shows the crowbar T in position. As shown in Figure 10, the crowbar T is positioned between the base plate B2 and the upright wall 32 with its tip T1 facing downwards and its gripping portion T3 facing upwards. At this time, the tip T1 of the crowbar T is located at the connection point between the connecting plate 31 and the upright wall 32 and is supported by the upright wall 32 from rear to front. Furthermore, the bent portion T2 extends upward from the upright wall 32, inclined toward the side surface B2b of the base plate B2, and the contact portion T4 abuts against the side surface B2b of the base plate B2.

[0039] Finally, the worker adjusts the position of the column base B relative to the column base foundation F1 (step S13). Specifically, the worker presses the gripping part T3 of the crowbar T forward (in the direction indicated by the arrow in Figure 10). This allows the base plate B2 to be pushed forward via the contact part T4 of the crowbar T, and the horizontal position of the column base B relative to the column base foundation F1 can be adjusted in the front-rear direction. At this time, the worker can use the principle of leverage to align the column base B by using the tip part T1 of the crowbar T as the fulcrum, the gripping part T3 as the point of force application, and the contact part T4 as the point of application. Therefore, it is possible to efficiently align the column base B relative to the column base foundation F1 with a small force. The crowbar T corresponds to the pushing tool of the present invention.

[0040] With the above steps completed, the positioning of column base B relative to column base foundation F1 is finished. By using the column base position adjustment jig 1, the worker can adjust the position of column base B relative to column base foundation F1 even if foundation beam F2 is not installed. Furthermore, by utilizing the principle of leverage, it is possible to efficiently align column base B with column base foundation F1 with minimal force.

[0041] The column base position adjustment jig 1 according to one embodiment of the present invention has been described above. 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 embodiment described above, a crowbar T was used to push in the base plate B2, but the tool used to push in the base plate B2 is not limited to a crowbar T. Any tool that can push in the base plate B2 will suffice, and a commonly available nail puller tool may also be used.

[0042] Furthermore, although the above-described embodiment explained that the anchor bolt contact member 2 has a substantially L-shaped cross-section, the cross-sectional shape of the anchor bolt contact member 2 is not limited to a substantially L-shape. However, it is preferable that the anchor bolt contact member 2 has a shape that can secure a wide contact area when it contacts the side surface of the anchor bolt F1a. This makes it possible to suppress damage to the thread groove formed in the anchor bolt F1a when using the column base position adjustment jig 1. In addition, to suppress damage to the thread groove formed in the anchor bolt F1a, an elastically deformable elastic member may be provided in the anchor bolt contact member 2.

[0043] Furthermore, in the embodiments described above, the crowbar T was explained as being supported from rear to front by a connecting portion between the connecting plate 31 and an upright wall 32 provided at the rear end 31b of the connecting plate 31. However, the support structure is not limited to the upright wall 32. It is sufficient that the crowbar T can be supported from rear to front, and the connecting plate 31 may be provided with an engagement groove or engagement projection that can engage with the tip T1 of the crowbar T.

[0044] Furthermore, although the displacement restricting member 23 was described as a plate-shaped member extending to the rear in the above-described embodiment, it is not limited to this. It only needs to have a shape that can restrict lateral displacement by contacting the left-right side surface of the anchor bolt F1a, and may even be a protruding piece.

[0045] Furthermore, although the displacement restricting members 23 were described in the above-described embodiment as being provided at both ends in the left-right direction of the anchor bolt contact member 2, the invention is not limited to this. The displacement restricting members 23 only need to be able to restrict the left-right displacement of the column base position adjustment jig 1 by contacting the anchor bolt F1a, and may be provided inside the left-right ends of the anchor bolt contact member 2. In this case, the displacement restricting members 23 restrict the left-right displacement of the column base position adjustment jig 1 by contacting the inner side surface of the anchor bolt F1a in the left-right direction.

[0046] Furthermore, in the embodiment described above, it was explained that one column base position adjustment jig 1 is attached to the column base foundation F1. In this case, after the position adjustment work in the direction to which the column base foundation F1 is attached is completed, the column base position adjustment jig 1 can be removed and attached to another position (another direction) of the column base foundation F1, thereby allowing the position of the column base B to be adjusted from a different direction. Furthermore, multiple column base position adjustment jigs 1 may be attached to the column base foundation F1. This makes it possible to repeatedly adjust the position of the column base B without removing the column base position adjustment jigs 1 from the column base foundation F1. [Explanation of Symbols]

[0047] 1. Column base position adjustment jig 2 Anchor bolt contact member 21 Horizontal section 22 Standing part 23 Displacement restricting member 3 Connecting members 31 Connecting plate 31a Front end 31b Rear end (protrusion) 32 Standing wall (tool support part) 33 Reinforcement wall 34 Viewing window B Column base B1 pillar B2 Base Plate B2a Assembly hole B2b side view B3 Scribble lines F Foundation F1 column base foundation F1a Anchor Bolt F1b Column support F1c fastening nut F2 foundation beam F3 Ground Mark T-bar (push tool) T1 tip T2 bent part T3 grip part T4 contact part

Claims

1. A column base position adjustment jig used to adjust the horizontal position of a column base relative to a column base foundation by pushing forward a base plate provided at the lower end of the column base with a pushing tool, An anchor bolt contact member having an elongated shape, extending in the left-right direction and contacting the front side surfaces of the left and right anchor bolts fixed to the column base foundation on both sides in the longitudinal direction, and positioned in the front-rear direction relative to the left and right anchor bolts, The system includes a connecting member that is connected to the anchor bolt contact member and has a protruding portion that extends rearward from the base plate, The column base position adjustment jig is characterized in that the connecting member has a tool support portion on the protruding portion that supports the pushing tool from rear to front when the base plate is pushed forward.

2. The column base position adjustment jig according to claim 1, characterized in that the anchor bolt contact member contacts the left and right anchor bolts on both sides in the longitudinal direction and has left and right displacement restricting members that restrict left and right displacement of the left and right anchor bolts.

3. The column base position adjustment jig according to claim 1, characterized in that the anchor bolt contact member stands upright and has vertical walls that contact the left and right anchor bolts.

4. The column base position adjustment jig according to claim 1, characterized in that the connecting member is connected to the anchor bolt contact member at the center of the anchor bolt contact member in the longitudinal direction of the anchor bolt contact member.

5. The column base position adjustment jig according to claim 1, characterized in that the connecting member is connected to the anchor bolt contact member at a position deviated in the longitudinal direction from the longitudinal center of the anchor bolt contact member.

6. The column base position adjustment jig according to claim 1, characterized in that the connecting member has a viewing window in the protruding part that allows the ground mark drawn on the column base to be viewed from above the connecting member.

7. The tool support portion is an upright wall that protrudes upward from the connecting member, The column base position adjustment jig according to claim 1, characterized in that the connecting member has left and right reinforcing walls located at both ends of the upright wall in the left-right direction.

Images