Positioning jig, foundation construction jig, and foundation construction method

Abstract

To provide a position confirmation jig capable of easily confirming a core position of a pillar when constructing a foundation of a building.SOLUTION: A positioning jig 30 is a jig for confirming a core position of a column supported by a plurality of anchor bolts F2, which is attached to an upper portion of an anchor suspension jig 20 for burying a plurality of anchor bolts F2 in the foundation concrete in a protruding state. The positioning jig 30 comprises a first extending portion 31 passing through the core position of the column and extending to connect a first anchor bolt F2A and a second anchor bolt F2B among the plurality of anchor bolts in top view, and a second extending portion 32 that is connected to the first extending portion 31 at the core position of the column, extends in a direction intersecting the extending direction of the first extending portion 31, extends to connect the first extending portion 31 and a third anchor bolt F2C in top view.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a positioning jig, a foundation construction jig, and a foundation construction method, and particularly relates to a positioning jig, a foundation construction jig, and a foundation construction method for installing a column support on a portion that becomes the core position of a column on a foundation concrete.

Background Art

[0002] Conventionally, when constructing the foundation of a building (a building made of reinforced concrete), an anchor hanging jig is known, which is installed on the upper part of a formwork for the foundation with a plurality of anchor bolts partially embedded in the foundation concrete. Specifically, the anchor hanging jig is mainly composed of an anchor gauge that is installed on the upper surface of the formwork for the foundation and positions the anchor bolt in the horizontal direction, and an anchor height adjustment member that extends longitudinally in the vertical direction, connects the anchor gauge and the anchor bolt, and is attached in a state where the height position of the anchor bolt can be changed with respect to the anchor gauge (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when constructing the foundation of a building, a technique for accurately and easily confirming the core position of a column (column base) supported by a plurality of anchor bolts has been demanded. Specifically, in order to connect columns (column bases) to the foundation of a building, a plurality of anchor bolts are embedded in the foundation concrete in a protruding state, and before the placed foundation concrete hardens, a column support (shear metal fittings) is installed on the foundation concrete in a state where a part of it is embedded. By installing the column support, even when a shear force from a brace is applied to the column base, the column support can support the foundation and efficiently transmit the shear force to the foundation. At this time, in order to vertically connect the column to the foundation, it is necessary to install the above column support at the core position of the column. Therefore, there has been a demand for a technique to easily confirm the core position of the column and accurately install the column support at the core position of the column. In particular, when installing the column support on the foundation concrete, since the foundation concrete is in a soft state (a state with viscosity), it has been difficult to adjust the installation position once the column support is installed. Therefore, there has been a demand for a technique to accurately determine the location where the column support is first installed on the foundation concrete.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide a positioning jig, a foundation construction jig, and a foundation construction method that can easily confirm the core position of a column when constructing the foundation of a building. Another object of the present invention is to provide a positioning jig, a foundation construction jig, and a foundation construction method that can accurately and easily install a column support (shear metal fittings) at the part that becomes the core position of the column on the foundation concrete.

Means for Solving the Problems

[0006] According to the positioning jig of the present invention, the above problem is solved by being used when installing a plurality of anchor bolts and column supports partially embedded on the foundation concrete, and being a positioning jig for installing the column support at a portion that becomes the core position of the column on the foundation concrete. The positioning jig is attached to an anchor hanging jig for installing a plurality of anchor bolts on the foundation concrete, and includes an alignment member provided so as to pass through a portion that becomes the core position of the column, and a hanging member attached to the alignment member and configured to hang the column support so as to be removable downward at a portion that becomes the core position of the column among the alignment members. With the above configuration, when constructing the foundation of a building, it is possible to realize a positioning jig that can easily confirm the core position of the column and accurately install the column support at the core position of the column. Specifically described, the positioning jig includes an alignment member and a hanging member that hangs the column support so as to be removable downward at a portion that becomes the core position of the column among the alignment members. Therefore, the column support can be pre-hung at a portion that becomes the core position of the column, and the column support can be removed (dropped) downward when installing the column support on the foundation concrete. By doing so, the column support can be installed (dropped) relatively accurately and easily at a portion that becomes the core position of the column on the foundation concrete.

[0007] At this time, the alignment member is a metal member installed on the anchor hanging jig, the hanging member is a permanent magnet or a member having a permanent magnet, and it is preferably attached to the bottom surface of a portion that becomes the core position of the column among the alignment members and is interposed between the alignment member and the metal column support in the vertical direction. With the above configuration, the column support can be easily hung at a portion that becomes the core position of the column among the alignment members by using a permanent magnet. Also, by adjusting the magnetic force of the permanent magnet, the column support can be easily removed (dropped) downward (toward the foundation concrete) from the alignment member. In the conventional construction work for installing column supports on the existing foundation concrete, there was a difficulty that the working space was narrow and it was difficult for workers to reach. Therefore, by dropping the column support as described above, it has become possible to significantly facilitate the installation work of the column support. In addition, it has also become possible to reduce the work of repeatedly checking the installation position of the column support. Further, it has become possible to reduce the chance that workers accidentally touch the foundation concrete.

[0008] At this time, the alignment member is a metal alignment plate having a through hole penetrating in the vertical direction at a portion that becomes the core position of the column among the alignment members, and the suspension member is a ring-shaped permanent magnet having a through hole penetrating in the vertical direction. It is preferable that the alignment member is interposed between the through hole of the alignment member and the through hole of the suspension member in a state where they communicate in the vertical direction, and between the alignment member and the metal column support. Further, it is preferable to further include a pin-shaped or rod-shaped pushing member that is inserted so as to penetrate the through hole of the alignment member and the through hole of the suspension member in the vertical direction from above the alignment member, and is used to push out the column support downward. With the above configuration, for example, by using a pin-shaped or rod-shaped pushing member, the column support can be accurately and easily installed at a portion that becomes the core position of the column on the foundation concrete. That is, the column support can be dropped (freely fall) to an accurate position. In particular, it is possible to accurately determine the place where the column support is first installed on the foundation concrete.

[0009] Further, the above problem is solved by a foundation construction jig including the above position confirmation jig and the above anchor suspension jig for constructing a building foundation. The anchor suspension jig is installed on the upper part of a formwork for the foundation, and includes an anchor gauge for positioning the anchor bolt in the horizontal direction, and an anchor height adjustment member that extends longitudinally in the vertical direction, connects the anchor gauge and the anchor bolt, and is attached to the anchor gauge in a state where the height position of the anchor bolt can be changed. The alignment member is supported by the upper ends of the anchor height adjustment members attached to each of the plurality of anchor bolts, and is disposed at a position above the anchor gauge. The suspension member is disposed within the frame of the anchor gauge and suspends the column support within the frame of the anchor gauge so as to be able to drop downward. With the above configuration, it is possible to realize a foundation construction jig capable of easily confirming the core position of the column and accurately installing the column support at the core position of the column. Further, with the above configuration, a space (interval) can be formed between the positioning jig (alignment member) and the frame-shaped anchor gauge in the vertical direction. By utilizing this space, it becomes easier for the operator to suspend the column support on the positioning jig.

[0010] It is also used when installing a plurality of anchor bolts and column supports partially embedded on the foundation concrete, and is a building foundation construction method using a positioning jig for installing the column support at a portion that becomes the core position of the column on the foundation concrete, including a formwork assembly step of assembling a formwork for the foundation, a jig erection step of erecting an anchor hanging jig on the upper part of the formwork for the foundation, an anchor assembly step of assembling the anchor bolt to be hung by the anchor hanging jig, a jig attachment step of attaching the positioning jig to the anchor hanging jig, and a column support hanging step of hanging the column support by the positioning jig. In the jig attachment step, the positioning jig provided so as to pass through a portion that becomes the core position of the column is attached to the anchor hanging jig. In the column support hanging step, the column support is hung so as to be removable downward at a portion that becomes the core position of the column among the positioning jigs. The problem is also solved by a foundation construction method characterized by this.

[0011] At this time, after the column support hanging step, it further includes a column support dropping step of dropping the column support onto the foundation concrete. In the column support hanging step, the column support is hung so as to be detachable downward on the positioning jig having a through hole that penetrates vertically through a portion that becomes the core position of the column and reaches the upper surface of the column support. In the column support dropping step, a pin-shaped or rod-shaped pushing member for pushing out the column support is inserted into the through hole from above the positioning jig, and the inserted pushing member is brought into contact with the upper surface of the column support to drop the column support downward. This is preferable. With the above configuration, when constructing the foundation of a building, the core position of the column can be easily confirmed. Also, by using a pin-shaped or rod-shaped pushing member, the column support can be freely dropped and easily installed at an accurate position on the foundation concrete.

Effect of the Invention

[0012] According to the positioning jig, foundation construction jig, and foundation construction method of the present invention, when constructing the foundation of a building, it becomes possible to easily confirm the core position of the column. In addition, it becomes possible to accurately and easily install a column support (shear metal fitting) at the portion that becomes the core position of the column on the foundation concrete. In particular, it becomes possible to accurately determine the location where the column support is first installed on the foundation concrete.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 6C

Figure 6D

Figure 7

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 7. This embodiment relates to an invention of a "positioning jig" for installing a plurality of anchor bolts and column supports partially embedded on the foundation concrete, and for installing a column support at a position that becomes the core position of the column on the foundation concrete. It also relates to an invention of a "foundation construction jig" equipped with the positioning jig, and an invention of a "foundation construction method" using the foundation construction jig.

[0015] <Foundation construction jig> The foundation construction jig 1 of this embodiment is a jig used when constructing the foundation of a reinforced concrete building, as shown in FIGS. 1 and 2. For example, it is a jig used when constructing a foundation by an exposed type fixed column base method. Specifically, the foundation construction jig 1 is used when placing the foundation concrete, and includes a formwork 10 for the foundation assembled according to the shape of the foundation, an anchor hanging jig 20 installed on the upper part of the formwork 10 for installing a plurality of anchor bolts F2 on the foundation concrete, and a positioning jig 30 installed on the upper part of the anchor hanging jig 20 for installing a column support F3 (shear hardware) at a position that becomes the core position of the column (column base) on the foundation concrete. It is mainly composed of these.

[0016] In addition, inside the foundation, as shown in FIGS. 1 and 6B, a plate-shaped anchor support F1 installed on the foundation ground, a plurality of anchor bolts F2 supported by the anchor support F1 for connecting the foundation and the column (column base), and a reinforcing bar unit (column-shaped reinforcing bar unit) (not shown) arranged to surround the plurality of anchor bolts F2 and supported by the anchor support F1 will be embedded. Also, inside the foundation, as shown in FIGS. 2 and 6C, before the placed foundation concrete F4 hardens, a metal column support F3 is installed in a state where it is partially embedded on the foundation concrete F4.

[0017] As shown in Fig. 1, the anchor support F1 includes a plate-shaped support base F1a installed at a predetermined position on the foundation ground, a plurality of anchor support portions F1b provided on the support base F1a for supporting the anchor bolt F2 from below, and a plurality of reinforcing bar support portions F1c provided on the support base F1a for supporting the reinforcing bar unit from the side and below. Note that an engaging portion is formed at the upper end of the anchor support portion F1b for detachably engaging with an engaged portion provided at the lower end of the anchor bolt F2. The anchor support portions F1b and the reinforcing bar support portions F1c are provided at predetermined intervals on the outer edge portion of the support base F1a. Specifically, the anchor support portions F1b and the reinforcing bar support portions F1c are arranged so as to be alternately aligned.

[0018] As shown in Figs. 1 and 3, the anchor bolt F2 is mainly composed of a vertically long anchor main body portion F2a that is the main body portion of the anchor bolt F2, an anchor threaded portion F2b that continuously extends upward from the anchor main body portion F2a, and a disc-shaped anchor fixing portion F2c provided at the lower end of the anchor main body portion F2a. As shown in Fig. 6C, the column support F3 includes a plate-shaped support plate F3a installed at a portion that becomes the core position of the column on the foundation concrete F4, a frame-shaped connecting portion F3b provided so as to protrude upward from the support plate F3a and connected to the lower end portion (base plate) of the column, a shaft connecting portion F3c disposed inside the frame-shaped connecting portion F3b, and an embedded portion F3d that protrudes downward from the bottom surface of the support plate F3a and is embedded in the foundation concrete F4.

[0019] In the above configuration, as shown in Fig. 6D, after the construction of the foundation is completed, a plurality of anchor bolts F2 and column supports F3 are fixed in a state where they partially protrude on the foundation concrete F4. Then, a base plate provided at the lower end portion of the column (column base) is connected to the plurality of anchor bolts F2 and column supports F3, and the column can be erected vertically.

[0020] As shown in Fig. 1, the basic formwork 10 is provided on both sides in the width direction of the foundation (the space serving as the foundation) so as to face each other, and is a formwork arranged along the extending direction of the foundation. On the upper surface of the assembled basic formwork 10, an anchor suspension jig 20 (anchor gauge 21) is assembled along the extending direction of the foundation. In addition, in Fig. 1, a part of the basic formwork 10 is omitted.

[0021] As shown in Figs. 1 to 4, the anchor suspension jig 20 is installed on the upper surface of the basic formwork 10 (specifically, the basic formworks 10A and 10B), and includes an anchor gauge 21 for positioning the anchor bolt F2 in the horizontal direction, and an anchor height adjustment member 22 that extends long in the vertical direction, connects the anchor gauge 21 and the anchor bolt F2, and is attached in a state where the height position of the anchor bolt F2 can be changed with respect to the anchor gauge 21.

[0022] As shown in Figs. 1 and 2, the anchor gauge 21 is composed of a frame body formed by combining flat plates having a predetermined width, and is fixed to the upper surface of the basic formwork 10 using fastening members. Specifically, the anchor gauge 21 has a frame-shaped formwork fixing part 21a fixed to the upper surface of the basic formwork 10, a frame-shaped anchor support part 21b arranged at a position inside the formwork fixing part 21a and supporting a plurality of anchor height adjustment members 22, and a plurality of connecting parts 21c connecting the formwork fixing part 21a and the anchor support part 21b. The anchor support part 21b has a rectangular frame shape, and assembly holes 21d for assembling the anchor height adjustment members 22 are respectively formed at the four corners of the anchor support part 21b.

[0023] As shown in FIGS. 3 and 4, the anchor height adjustment member 22 mainly includes a long bolt 22a that extends in the vertical direction and penetrates the anchor gauge 21 (assembly hole 21d), clamping nuts 22b and 22c that are screwed onto the long bolt 22a and sandwich the anchor gauge 21 in the vertical direction, and a height adjustment nut 22d (long nut) that is screwed onto the long bolt 22a from below and extends in the vertical direction. Further, an anchor screw portion F2b of the anchor bolt F2 is screwed into the lower portion of the height adjustment nut 22d, and the height adjustment nut 22d and the anchor bolt F2 are integrally connected.

[0024] In the above configuration, the anchor height adjustment member 22 can change the height position of the anchor bolt F2 with respect to the anchor gauge 21 by adjusting the screwing position of the height adjustment nut 22d with respect to the long bolt 22a.

[0025] As shown in FIGS. 2 and 5, the positioning jig 30 is a jig that is attached to the upper ends of a plurality of long bolts 22a among the anchor suspension jigs 20 and is used to confirm the core position of the column. Further, the positioning jig 30 is a jig for installing the column support F3 at a portion that becomes the core position of the column on the foundation concrete.

[0026] Specifically, the positioning jig 30 includes a metal alignment member 31, a suspension member 32 that is detachably attached to the bottom surface of a portion that becomes the core position of the column among the alignment members 31, and a pin-shaped push member 33 that is attached so as to penetrate the alignment member 31 and the suspension member 32 in the vertical direction from above the alignment member 31. Note that the positioning jig 30 is supported by support nuts 34 respectively assembled to the upper ends of a plurality of long bolts 22a. Therefore, by finely adjusting the height positions of the respective support nuts 34, the leveling of the positioning jig 30 can be easily performed.

[0027] As shown in FIGS. 2 and 5, the alignment member 31 is composed of a T-shaped alignment plate and is arranged in a floating state above the anchor gauge 21. The alignment member 31 passes through a portion that becomes the core position of the column, and in a top view, includes a first extending portion 31a that extends to connect the first anchor bolt F2A and the second anchor bolt F2B among a plurality of anchor bolts F2, and a first extending portion 31a that is connected to the first extending portion 31a at a portion that becomes the core position of the column and extends in a direction intersecting the extending direction of the first extending portion 31a, and in a top view, extends to connect the first extending portion 31a and the third anchor bolt F2C, and a second extending portion 31b.

[0028] Specifically, the first extending portion 31a extends linearly in a top view so as to connect the first anchor bolt F2A and the second anchor bolt F2B located on the diagonal line among the plurality of anchor bolts F2. The second extending portion 31b extends in a direction orthogonal to the first extending portion, and in a top view, extends to connect the third anchor bolt F2C adjacent to each of the first anchor bolt F2A and the second anchor bolt F2B. In the alignment member 31, the connecting portion of the first extending portion 31a and the second extending portion 31b is the central portion (central part) of the alignment member 31 and is also the portion that becomes the core position of the column. In the portion of the alignment member 31 that becomes the core position of the column, a through hole 31d penetrating in the vertical direction is formed.

[0029] In the first extending portion 31a, at positions corresponding to the first anchor bolt F2A and the second anchor bolt F2B, assembly holes 31c for passing and assembling the long bolts 22a are respectively formed. Similarly, in the second extending portion 31b, at positions corresponding to the third anchor bolt F2C, assembly holes 31c are also formed. These assembly holes 31c are arranged at positions equidistant from the central portion (through hole 31d) of the alignment member 31.

[0030] As shown in FIGS. 2 and 5, the suspension member 32 is a ring-shaped permanent magnet that is interposed between the alignment member 31 and the column support F3 in the vertical direction, and suspends the column support F3 so that it can be removed downward from the alignment member 31. In other words, the suspension member 32 is attached to the bottom surface of the alignment member 31 so that the column support F3 can be detachably attached in the vertical direction.

[0031] The suspension member 32 has a through hole 32a with a circular cross-section that penetrates vertically along its central axis. As shown in FIG. 6A, the through hole 32a has a first hole portion with an inverted taper shape that becomes narrower as it goes downward from the upper end (opening) of the suspension member 32, and a second hole portion that is formed continuously from the first hole portion with a uniform width toward the lower end of the suspension member 32. The through hole 31d of the alignment member 31 and the through hole 32a of the suspension member 32 communicate with each other in the vertical direction. Also, the diameter of the through hole 31d and the diameter of the second hole portion of the through hole 32a are the same size. Alternatively, the diameter of the through hole 31d is slightly larger than the diameter of the second hole portion of the through hole 32a. Note that the communicating through holes 31d and 32a extend to a position reaching from the upper end of the positioning jig 30 to the upper surface of the column support F3.

[0032] As shown in FIGS. 2, 6A, and 6C, the pushing member 33 is a long metal member having a pin shape. The pushing member 33 is inserted from above the alignment member 31 so as to penetrate the through hole 31d of the alignment member 31 and the through hole 32a of the suspension member 32 in the vertical direction, and is a member for pushing the column support F downward. Note that the pushing member 33 is not limited to a pin shape, and may be a rod-shaped pushing member having a larger diameter than the pin shape. That is, the diameter of the pushing member 33 may be appropriately increased according to the diameters of the through hole 31d and the through hole 31d.

[0033] With the above configuration, as shown in FIGS. 6A to 6D, by using the positioning jig 30, it becomes possible to easily confirm the core position of the column. Also, on the foundation concrete F4, it becomes possible to accurately and easily install the column support F3 (shear metal fittings) at the portion that is the core position of the column. Specifically, as shown in FIGS. 6A and B, the column support F3 can be easily suspended using the alignment member 31 and the suspension member 32 (permanent magnet). Also, as shown in FIG. 6C, the column support F3 can be freely dropped onto the portion that is the core position of the column on the foundation concrete F4 using the extrusion member 33.

[0034] Also, in the above configuration, as shown in FIG. 2, the alignment member 31 is composed of a T-shaped plate body and is disposed at a position above the anchor gauge 21. Therefore, a working space (gap) can be formed in the vertical direction between the alignment member 31 and the anchor suspension jig 20 (anchor gauge 21). By utilizing this working space, as shown in FIGS. 6B and C, the column support F3 can be easily suspended. That is, the column support F3 can be suspended and installed without interfering with other members.

[0035] Also, in the above configuration, as shown in FIG. 2, the suspension member 32 is disposed within the frame of the anchor gauge 21 and suspends the column support F3 within the frame of the anchor gauge 21 so as to be able to drop downward. Therefore, it becomes easier to secure a working space when an operator performs the operation of suspending the column support F3. Also, it becomes easier to secure a working space when the operator performs the operation of dropping the column support F3. That is, the construction work of installing the column support F3 on the foundation concrete F4 is made much more efficient than before.

[0036] <Foundation construction method> Next, the foundation construction method of the building will be described with reference to FIG. 7. First, as shown in FIG. 1, it starts with an "anchor support installation step" (step S1) in which a constructor for foundation work installs an anchor support F1 on the foundation ground and fixes it using a fixing member (for example, a concrete nail) not shown in the figure. At this time, by using the layout line drawn in advance on the foundation ground as a mark, the anchor support F1 can be accurately installed at a predetermined position (the position where the column is to be erected) on the foundation ground.

[0037] Thereafter, the constructor performs an "anchor installation step" of installing an anchor bolt F2 on the anchor support F1 (step S2), and further performs a "reinforcing bar assembly step" of assembling a reinforcing bar unit not shown in the figure (step S3). At this time, it is preferable to assemble a reinforcing bar unit not shown in the figure so as to hold the plurality of installed anchor bolts F2 from the side. Note that the order of steps S2 and S3 may be interchanged. In that case, it is preferable to install the reinforcing bar unit and install the anchor bolt F2 from above in the area surrounded by the reinforcing bar unit.

[0038] Thereafter, as shown in FIG. 1, the constructor performs a "formwork assembly step" of assembling foundation formworks 10A and 10B so as to face each other on both side portions in the width direction of the space serving as the foundation (step S4), and further performs a "fixture erection step" of erecting an anchor hanging fixture 20 on the upper part of the foundation formwork 10 (step S5).

[0039] Thereafter, as shown in FIGS. 1, 3, and 4, the constructor performs an "anchor assembly step" of assembling the anchor bolt F2 to be hung on the anchor hanging fixture 20 (step S6). At this time, by adjusting the screwing position of the height adjustment nut 22d with respect to the long bolt 22a, it is possible to change the height position of the anchor bolt F2 with respect to the anchor gauge 21. By performing the steps S1 to S6 described above, the anchor bolt F2 is positioned. Specifically, the horizontal positioning of the anchor bolt F2 can be performed by the anchor support F1 and the anchor gauge 21. Further, the vertical positioning of the anchor bolt F2 can be performed by the anchor height adjustment member 22.

[0040] Thereafter, as shown in FIGS. 2 and 6A, an operator performs a "fixture attachment step" of attaching the positioning fixture 30 to the upper part of the anchor suspension jig 20 (step S7). Specifically, the plate-shaped alignment member 31 is attached so as to pass through the portion that is the core position of the column and is supported by the first anchor bolt F2A, the second anchor bolt F2B, and the third anchor bolt F2C in a top view. Specifically, the alignment member 31 is attached to the upper end portion of the anchor height adjustment member 22.

[0041] Thereafter, as shown in FIGS. 2 and 6A, a "column support suspension step" of suspending the column support F3 from the alignment member 31 is performed (step S8). Specifically, first, a suspension member 32 is attached to the position that is the central portion of the upper surface of the column support F3 (step S8-1). Then, a pushing member 33 is inserted upward toward the through hole 31d formed in the central portion of the alignment member 31, and the pushing member 33 is passed through (step S8-2). Then, while using the pushing member 33 as a guide, the column support F3 with the suspension member 32 is moved upward toward the back surface of the alignment member 31 (step S8-3). At this time, the pushing member 33 passes through the through hole 32a of the suspension member 32 and is in contact with the upper surface of the column support F3. Note that by moving the column support F3 upward, the pushing member 33 is also lifted upward. Then, the column support F3 is attached so as to be suspended from the back surface of the portion that is the core position of the column in the alignment member 31 (step S8-4). The state shown in FIG. 6A is reached after going through the above steps S8-1 to S8-4. At this time, the suspension member 32 is interposed between the alignment member 31 and the column support F3. Also, the central axis of the alignment member 31, the central axis of the suspension member 32, and the central axis of the column support F3 are set coaxially.

[0042] After that, as shown in FIG. 6B, an operator performs a "concrete placing process" of placing the foundation concrete F4 into the foundation formwork 10 (step S9). After that, as shown in FIG. 6C, before the placed foundation concrete F4 hardens, a "column support dropping process" of installing the column support F3 in a state where a part of it is buried in the foundation concrete F4 is performed (step S10). Specifically, with the pushing member 33 inserted from above the alignment member 31 in contact with the upper surface of the column support F3, the column support F3 is pushed downward and allowed to free-fall (step S10-1). Then, the freely fallen column support F3 is installed at a portion that becomes the core position of the column on the foundation concrete (step S10-2). At this time, if the column support F3 cannot be installed at a predetermined position at once, the installation position of the column support F3 is finely adjusted. After completing the process of step S10, a series of work processes are completed. Note that after the completion of the above work process, the foundation construction jig 1 is removed (see FIG. 6D).

[0043] With the above foundation construction method, when constructing the foundation of a building, it becomes possible to easily confirm the core position of the column. Also, it becomes possible to accurately and easily install a column support (shear metal fittings) at a portion that becomes the core position of the column on the foundation concrete.

[0044] Note that in the above foundation construction method, the order of each work process may be appropriately changed. For example, before the "anchor support fixing process" of S1, the "anchor installation process" of S2, and the "rebar assembly process" of S3, the "formwork assembly process" of S4 and the "jig erection process" of S5 may be performed first. For example, the positioning jig 30 may be pre-assembled to the anchor suspension jig 20. That is, in the "jig erection step" of S5, the anchor suspension jig 20 with the positioning jig 30 may be erected. In that case, the "jig attachment step" of S7 can be omitted. For example, the "column support lifting step" of S8 may be performed after the "concrete placing step" of S9. That is, it is also possible to first place the foundation concrete F4 and then suspend the column support F3 when the foundation concrete F4 is in a soft state.

[0045] <Other Embodiments> In the above embodiment, as shown in FIG. 2, the alignment member 31 is formed as a flat plate body, but it can be changed without particular limitation. That is, the alignment member 31 preferably has a shape that is as compact as possible, but it may have a predetermined shape.

[0046] In the above embodiment, as shown in FIGS. 2 and 5, the alignment member 31 has a T-shape and is supported at three points by three anchor bolts F2 (strictly speaking, three long bolts 22a), but it can be changed without particular limitation. For example, the alignment member 31 may have a cross shape and be supported at four points by four anchor bolts F2. In that case, the alignment member 31 can be assembled more stably. Alternatively, the alignment member 31 may be supported at two points by two anchor bolts F2. Even in that case, a space (gap) can be formed between the alignment member 31 and the anchor suspension jig 20 in the vertical direction.

[0047] In the above embodiment, as shown in FIG. 2, the suspension member 32 was the permanent magnet itself, but it is not particularly limited and may be a member having a permanent magnet. For example, the suspension member 32 may be a holder member having a permanent magnet. In that case, it is preferable that the suspension member 32 is configured to hold the column support F3 from both sides. By doing so, the column support F3 can be made to free fall more accurately.

[0048] In the above embodiment, as shown in FIG. 2, the suspension member 32 was a permanent magnet (a member having a permanent magnet), but it is not particularly limited, and it may be a member having means other than the attaching / detaching means by a permanent magnet. For example, the suspension member 32 may have a bolt-nut mechanism and be suspended so that the column support F3 can be attached to and detached from the bottom surface of the alignment member 31 in the vertical direction.

[0049] In the above embodiment, as shown in FIGS. 3 and 4, the anchor height adjustment member 22 includes "height adjustment means" composed of a long bolt 22a and a height adjustment nut 22d, but the height adjustment means can be changed without being particularly limited. For example, known height adjustment means by a mechanical structure may be employed.

[0050] In the above embodiment, the positioning jig, the foundation construction jig, and the foundation construction method according to the present invention have been mainly described. However, the above embodiment is merely an example for facilitating the understanding of the present invention and does not limit the present invention. The present invention can be changed and improved without departing from its gist, and it goes without saying that equivalents of the present invention are included therein.

Explanation of Reference Numerals

[0051] F Foundation F1 Anchor support F1a Support base F1b Anchor support portion F1c Rebar support portion F2 Anchor bolt F2A First anchor bolt F2B Second anchor bolt F2C Third anchor bolt F2a Anchor main body part F2b Anchor screw part F2c Anchor fixing part F3 Column support tool (hardware) F3a Support plate F3b Frame-shaped connecting part F3c Shaft connecting part F3d Embedded part F4 Foundation concrete 1 Foundation construction tool 10(10A, 10B) Foundation formwork 20 Anchor hanging tool 21 Anchor gauge 21a Formwork fixing part 21b Anchor support part 21c Connecting part 21d Assembly hole 22 Anchor height adjustment member 22a Long bolt 22b, 22c Clamping nut 22d Height adjustment nut 30 Positioning tool 31 Alignment member (alignment plate) 31a First extending part 31b Second extending part 31c Assembly hole 31d Through hole 32 Hanging member (permanent magnet) 32a Through hole 33 Extrusion member 34 Support nut

Claims

1. A positioning jig used when installing a plurality of anchor bolts and column supports partially embedded on a foundation concrete, the positioning jig being for installing the column support at a portion that becomes the core position of the column on the foundation concrete, wherein the positioning jig is attached to an anchor hanging jig for installing a plurality of anchor bolts on the foundation concrete, and includes an alignment member provided so as to pass through a portion that becomes the core position of the column; and a hanging member attached to the alignment member, the hanging member hanging the column support so as to be removable downward at a portion that becomes the core position of the column among the alignment members. The positioning jig is characterized by this.

2. The alignment member is a metal member installed on the anchor hanging jig, wherein the hanging member is a permanent magnet or a member having a permanent magnet, is attached to the bottom surface of a portion that becomes the core position of the column among the alignment members, and is interposed between the alignment member and the metal column support in the vertical direction. The positioning jig according to Claim 1 is characterized by this.

3. The alignment member is an alignment plate made of metal having a through hole penetrating vertically at a portion that becomes the core position of the column among the alignment members, wherein the hanging member is a ring-shaped permanent magnet having a through hole penetrating vertically, and is interposed between the alignment member and the metal column support in a state where the through hole of the alignment member and the through hole of the hanging member are vertically communicated. The positioning jig according to Claim 1 or 2 is characterized by this.

4. The positioning jig according to Claim 3 further includes a pin-shaped or rod-shaped pushing member inserted from above the alignment member so as to penetrate the through hole of the alignment member and the through hole of the hanging member vertically, for pushing out the column support downward.

5. A foundation construction jig including the positioning jig according to any one of Claims 1 to 4 and the anchor hanging jig, wherein the anchor hanging jig is installed on the upper part of a formwork for the foundation, and includes an anchor gauge for positioning the anchor bolt in the horizontal direction. It extends longitudinally in the vertical direction, connects the anchor gauge and the anchor bolt, and is attached in a state where the height position of the anchor bolt can be changed with respect to the anchor gauge, and an anchor height adjustment member. The alignment member is supported by the upper end portions of the anchor height adjustment members attached to each of the plurality of anchor bolts, is disposed above the anchor gauge, The hanging member is disposed within the frame of the anchor gauge, and is characterized in that the column support is hung within the frame of the anchor gauge so as to be able to drop downward. A foundation construction jig.

6. When installing a plurality of anchor bolts and column supports partially embedded on the foundation concrete, a building foundation construction method using a positioning jig for installing the column support at a portion that becomes the core position of the column on the foundation concrete, A formwork assembly step of assembling a formwork for the foundation, A jig erection step of erecting an anchor hanging jig on the upper part of the formwork for the foundation, An anchor assembly step of assembling the anchor bolt so as to be hung on the anchor hanging jig, A jig attachment step of attaching the positioning jig to the anchor hanging jig, including a column support hanging step of hanging the column support on the positioning jig, In the jig attachment step, the positioning jig provided so as to pass through a portion that becomes the core position of the column is attached to the anchor hanging jig, In the column support hanging step, the column support is hung on a portion of the positioning jig that becomes the core position of the column so as to be removable downward. A foundation construction method characterized by this.

7. Further including a column support dropping step of dropping the column support onto the foundation concrete after the column support hanging step, In the column support hanging step, the column support is hung on the positioning jig having a through hole that penetrates vertically through a portion that becomes the core position of the column and reaches the upper surface of the column support so as to be able to drop downward, In the column support dropping step, A pin-shaped or rod-shaped pushing member for inserting into the through hole and pushing out the column support is inserted into the through hole from above the positioning jig, The foundation construction method according to claim 6, characterized in that the inserted pushing member is brought into contact with the upper surface of the column support to drop the column support downward.

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