Anchor hanging jig and foundation construction method

Abstract

To provide an anchor suspension jig that enables easy confirmation of height position of an anchor bolt when constructing a foundation of a building.SOLUTION: An anchor hanging jig 20 is a jig that is attached to an upper part of a foundation formwork 10, and is used to bury an anchor bolt F2 in a foundation concrete while a part thereof protrudes therefrom. The anchor suspension jig 20 is provided with a position confirmation hole 22e which vertically penetrates it from an upper end of the anchor suspension jig 20 to an upper end of the anchor bolt F2 in order to confirm the height position of the anchor bolt F2 when the anchor bolt F2 is suspended.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an anchor hanging jig and a foundation construction method, and more particularly to an anchor hanging jig that is attached to the upper part of a foundation formwork and used for embedding an anchor bolt in a state where a part of the anchor bolt protrudes into the foundation concrete, and a foundation construction method. [Background technology]

[0002] In recent years, buildings are required to be earthquake-resistant and fire-resistant, so the number of buildings is increasing, and steel frame structures are being used for the main parts of the buildings. The column bases of this steel-framed building are fixed in place by anchor bolts buried in the concrete foundation.

[0003] Conventionally, when installing the above-mentioned anchor bolts, an anchor hanging jig is used, which is erected on top of the foundation formwork and used to embed multiple anchor bolts in the foundation concrete with some of them protruding. This anchor hanging jig is installed on the upper surface of the foundation formwork and is mainly composed of an anchor ruler that positions the anchor bolt horizontally, and an anchor height adjustment member that extends a long length in the vertical direction, connects the anchor ruler and the anchor bolt, and is attached in a state where the height position of the anchor bolt relative to the anchor ruler can be changed (for example, see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-057408 A [Patent Document 2] JP 2004-211480 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, whether or not the height position of the anchor bolt satisfies the design tolerance is extremely important in relation to the pull-out strength of the anchor bolt, etc. When installing an anchor bolt using an anchor hanging jig, the height position of the anchor bolt is confirmed, for example, by measuring the distance from a predetermined reference plane to the upper end of the anchor bolt using a scale such as a tape measure. However, when measuring the height position of the anchor bolt using a scale such as a tape measure, the position of the upper end of the anchor bolt may be hidden by the anchor hanging jig and may not be visible. This may result in a large measurement error, making it difficult to accurately check the height position of the anchor bolt. Therefore, there was a demand for a technology that could accurately check the height position of the anchor bolt (the upper end portion of the anchor bolt). In addition, there has been a demand for technology that enables easy adjustment of the height position of an anchor bolt while checking the height position of the upper end portion of the anchor bolt when the height position of the anchor bolt does not satisfy the design tolerance range.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide an anchor hanging jig and a foundation construction method that make it possible to accurately check the height position of an anchor bolt when constructing the foundation of a building. Another object of the present invention is to provide an anchor hanging jig and a foundation construction method that enable the height position of the anchor bolt to be easily adjusted while checking the height position of the anchor bolt. [Means for solving the problem]

[0007] The above problem is solved by the anchor hanging jig of the present invention, which is attached to the upper part of a foundation formwork and is used to embed an anchor bolt in a state where the anchor bolt protrudes partially into the foundation concrete, an anchor ruler that is installed on the upper part of the foundation formwork and that positions the anchor bolt in the horizontal direction; and an anchor height adjustment member that extends long in the vertical direction and is connected to the anchor ruler so as to penetrate the anchor ruler in the vertical direction, and is attached in a state in which the height position of the anchor bolt can be changed relative to the anchor ruler, In order to confirm the height position of the anchor bolt when the anchor bolt is suspended, The anchor height adjustment memberA position confirmation hole is formed through the upper end of the anchor bolt in the vertical direction from the upper end of the The anchor height adjustment member is assembled through an assembly hole provided in the anchor ruler, and has a vertically long bolt and a nut screwed onto the shaft portion of the bolt, and is configured so that the height position of the anchor bolt can be changed by adjusting the assembly position of the bolt or the nut relative to the anchor ruler, and the position confirmation hole is formed in the bolt, and the position confirmation hole penetrates along the axial direction of the bolt from the upper end to the lower end of the bolt. This is solved by 。

[0008] With the above configuration, it is possible to realize an anchor hanging jig that can accurately check the height position of an anchor bolt when constructing the foundation of a building. More specifically, by utilizing the position confirmation hole and using, for example, a height confirmation gauge or laser light, the height position of the anchor bolt (the upper end portion of the anchor bolt) can be confirmed with high accuracy. Also With the above-described configuration, the height position of the anchor bolt can be easily adjusted while checking the height position of the anchor bolt by utilizing the anchor height adjustment member. Furthermore, as described above, by adjusting the mounting position of the bolt or nut of the anchor height adjustment member, the height position of the anchor bolt can be adjusted even more easily while checking the height position of the anchor bolt.

[0010] In this case, it is preferable that the position confirmation hole is formed to a size that allows the insertion of a confirmation rod for confirming the height position of the anchor bolt. With the above-described configuration, the confirmation rod can be smoothly inserted into the position confirmation hole, and by inserting, for example, an confirmation rod with a scale engraved thereon into the position confirmation hole, the height position of the anchor bolt can be confirmed with even greater accuracy.

[0011] In addition, the above problem is the above A foundation construction method using an anchor hanging jig, The above The method includes a formwork assembling step of assembling a foundation formwork, a jig installation step of installing the anchor hanging jig on the upper part of the foundation formwork, an anchor assembling step of assembling the anchor bolt to be hung on the anchor hanging jig, and an anchor confirmation step of confirming the height position of the assembled anchor bolt, and in the anchor confirmation step, a vertically penetrating jig is used from the upper end of the anchor hanging jig to the upper end of the anchor bolt in order to confirm the height position of the anchor bolt when it is hung. The above The above-mentioned problem is also solved by a foundation construction method, characterized in that the height position of the upper end portion of the anchor bolt is confirmed by using a position confirmation hole.

[0012] At this time, in the anchor confirmation step, an confirmation rod for confirming the height position of the anchor bolt is inserted into the position confirmation hole from above the anchor hanging jig, and the inserted confirmation rod is brought into contact with the upper end of the anchor bolt. With the above-described configuration, the height position of the anchor bolt can be confirmed with even greater accuracy, using the contact of the confirmation rod with the upper end of the anchor bolt as a guide. Effect of the Invention

[0014] According to the anchor hanging jig and foundation construction method of the present invention, it is possible to accurately check the height position of the anchor bolt when constructing the foundation of a building. Also, it becomes possible to easily adjust the height position of the anchor bolt while checking the height position of the anchor bolt. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view showing the foundation construction jig, and is a perspective view showing a state in which an anchor bolt is assembled to the anchor hanging jig. [Diagram 2] FIG. 2 is an enlarged view of a main portion of FIG. 1, showing an installed state of the anchor hanging jig. [Diagram 3] FIG. 2 is an exploded perspective view showing an anchor hanging jig (anchor ruler, anchor height adjustment member) and an anchor bolt. [Figure 4] FIG. 4 is an assembled perspective view of FIG. 3, showing a state before the confirmation rod is inserted. [Diagram 5] FIG. 13 is a perspective view showing a state after the confirmation rod is inserted. [Figure 6] FIG. 13 is an explanatory diagram showing a state in which the confirmation rod is abutted against the upper end of the anchor bolt. [Figure 7] FIG. 1 is a process diagram showing a foundation construction method using an anchor hanging jig. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. This embodiment relates to an invention of an "anchor hanging jig" that is attached to the upper part of a foundation formwork and used to embed an anchor bolt in a state where a part of the anchor bolt protrudes into the foundation concrete. It also relates to an invention for a "foundation construction method" using an anchor hanging jig.

[0017] <Foundation construction jig> The foundation construction jig 1 of this embodiment, as shown in Figures 1 and 2, is a jig used when constructing the foundation F of a reinforced concrete building, for example, a jig used when constructing a foundation using the high base method (exposed fixed column base method). Specifically, the foundation construction jig 1 is used when pouring foundation concrete and is mainly composed of a foundation formwork 10 (10A, 10B) assembled to match the shape of the foundation, an anchor hanging jig 20 that is erected on top of the foundation formwork 10 and used to embed multiple anchor bolts F2 in the foundation concrete with some of them protruding, an inspection rod 30 for checking the height position of the upper ends of the anchor bolts F2, and a position inspection jig 40 that is attached to the top of the anchor hanging jig 20 and used to check the center position of the column (column base).

[0018] As shown in FIG. 1, embedded inside the foundation are a plate-shaped anchor bolt support F1 that is placed on the foundation ground F3 (basic concrete), a plurality of anchor bolts F2 that are supported by the anchor bolt support F1 and are used to connect the foundation and the column (column base), and reinforcing bar units (column-type reinforcing bar units) (not shown) that are supported by the anchor bolt support F1 and are arranged so as to surround the plurality of anchor bolts F2.

[0019] As shown in FIG. 1, the anchor bolt support F1 comprises a plate-shaped base member F1a installed at a predetermined position on the foundation ground F3, a plurality of anchor support members F1b provided on the base member F1a and supporting the anchor bolts F2 from below, and a plurality of reinforcing bar support members F1c provided on the base member F1a and supporting the reinforcing bar units from below and laterally. The upper end of the anchor support member F1b is formed with an engaging portion that detachably engages with an engaged portion provided at the lower end of the anchor bolt F2. The anchor support members F1b and the reinforcing bar support members F1c are provided at predetermined intervals on the outer edge of the base member F1a. More specifically, the anchor support members F1b and the reinforcing bar support members F1c are arranged alternately.

[0020] As shown in Figs. 1 and 3, the anchor bolt F2 is mainly composed of an anchor body portion F2a that is long in the vertical direction and forms the main body of the anchor bolt F2, an anchor thread portion F2b that extends upward continuously from the anchor body portion F2a, and a disk-shaped anchor fixing portion F2c that is provided at the lower end portion of the anchor body portion F2a.

[0021] As shown in FIG. 1, the foundation formwork 10 is provided so as to face both sides in the width direction of the foundation (space that will become the foundation) and is a formwork disposed along the extension direction of the foundation. An anchor hanging jig 20 (anchor ruler 21) is attached to the upper surface of the assembled foundation formwork 10 along the extension direction of the foundation. In addition, part of the foundation formwork 10 is omitted in FIG.

[0022] As shown in Figures 1 to 5, the anchor hanging jig 20 is mainly composed of an anchor ruler 21 that is erected on the upper surface of the foundation formwork 10 (10A, 10B) and is used to position the anchor bolt F2 in the horizontal direction, and an anchor height adjustment member 22 that extends a long length in the vertical direction, connects the anchor ruler 21 and the anchor bolt F2, and is attached in a state where the height position of the anchor bolt F2 can be changed relative to the anchor ruler 21.

[0023] As shown in Figs. 1 and 2, the anchor ruler 21 is made of a frame-like body made up of flat plates having a predetermined width, and is fixed to the upper surface of the foundation formwork 10 using fastening members. Specifically, the anchor ruler 21 has a frame-shaped formwork fixing portion 21a that is fixed to the upper surface of the foundation formwork 10, a frame-shaped anchor support portion 21b that is positioned more inward than the formwork fixing portion 21a and supports a plurality of anchor height adjustment members 22, and a plurality of connecting portions 21c that connect the formwork fixing portion 21a and the anchor support portion 21b. The anchor support portion 21b has a rectangular frame shape, and assembly holes 21d for assembling the anchor height adjustment members 22 are formed in the four corners of the anchor support portion 21b.

[0024] As shown in Figures 2 and 3, the anchor height adjustment member 22 is mainly composed of a bolt 22a (long bolt) that extends in the vertical direction and passes through the anchor ruler 21 (assembly hole 21d), clamping nuts 22b, 22c that are screwed onto the bolt 22a and clamp the anchor ruler 21 in the vertical direction, and a nut 22d (height adjustment nut) that is screwed onto the shaft portion of the bolt 22a from above and extends in the vertical direction. After the bolt 22a is screwed into the screw hole of the nut 22d to a predetermined position, the bolt 22a and the nut 22d are fixed at the upper end of the screw hole of the nut 22d by welding 22f, and the bolt 22a and the nut 22d are integrated. Further, the entire anchor threaded portion F2b of the anchor bolt F2 is screwed into the lower portion of the nut 22d, and the entire thread of the anchor threaded portion F2b is in a cured state (see FIG. 6). Then, the nut 22d and the anchor bolt F2 are connected.

[0025] In the above configuration, the bolt 22a and the nut 22d are connected integrally with the anchor bolt F2, and by adjusting the assembly position of the bolt 22a or the nut 22d relative to the anchor ruler 21, the height position of the anchor bolt F2 can be changed.

[0026] In this embodiment, in order to increase the positional accuracy of the anchor bolt F2, the anchor bolt F2 is set upright coaxially from the anchor support member F1b, and the clearance between the assembly hole 21d of the anchor ruler 21 and the bolt 22a is set as small as possible. This increases the positional accuracy of the anchor bolt F2. However, for example, when pouring the foundation concrete F4, the anchor bolt F2 may be swept away by the lateral pressure of the concrete, causing the anchor bolt F2 to tilt, making it impossible for the bolt 22a to be removed from the anchor ruler 21. Therefore, the anchor bolt F2 is supported so as to be erected coaxially by the anchor support member F1b, so as to prevent the anchor bolt F2 from tilting. In addition, by creating a small amount of play by screwing the anchor bolt F2 and the nut 22d together, the bolt 22a is designed to be easily removed from the anchor ruler 21 even if the anchor bolt F2 is slightly tilted.

[0027] As shown in FIGS. 4 to 6, a position confirmation hole 22e for inserting a confirmation rod 30 is formed inside the bolt 22a. The position confirmation hole 22e is a through hole that passes vertically through the bolt 22a along the axial direction of the bolt 22a from the upper end to the lower end of the bolt 22a. Strictly speaking, the position confirmation hole 22e is a hole that is formed by communicating a through hole formed in the bolt 22a with a screw-in hole of the nut 22d, as shown in FIG. In other words, the position confirmation hole 22e is a through hole formed in the anchor hanging jig 20 at a position corresponding to a position directly above the anchor bolt F2. 5 and 6, the size of the position confirmation hole 22e is formed to allow the confirmation rod 30 to be inserted therein. For example, the diameter of the position confirmation hole 22e is formed to be slightly larger than the diameter of the confirmation rod 30.

[0028] As shown in Figs. 4 to 6, the checking rod 30 is a member for checking the height position of the upper end of the anchor bolt F2, and is a rod-like body formed in a long cylindrical shape. A scale 31 is marked on the outer circumferential surface of the checking rod 30 over the entire axial direction from its upper end to its lower end. The thickness of the confirmation rod 30 is formed to be large enough to be inserted into the position confirmation hole 22e. Moreover, the check bar 30 is formed to be slightly longer than the combined length of the bolt 22a and the nut 22d so that the scale 31 can be visually confirmed.

[0029] In the above configuration, the lower part of the bolt 22a assembled to the anchor ruler 21 is screwed into the upper part of the nut 22d, and the lower part of the nut 22d is screwed into the upper part of the anchor bolt F2, so that the anchor ruler 21, the bolt 22a, the nut 22d and the anchor bolt F2 are connected together. Furthermore, since the position confirmation hole 22e formed in the bolt 22a extends vertically upward of the anchor bolt F2, it is possible to insert an confirmation rod 30 from above the bolt 22a and bring the confirmation rod 30 into contact with the upper end of the anchor bolt F2, thereby confirming the height position of the upper end of the anchor bolt F2.

[0030] As shown in FIG. 1, the position confirmation jig 40 is attached to the upper ends of the multiple bolts 22a of the anchor hanging jig 20 and is a jig for confirming the center position of the pillar, and is configured in a T-shape. Specifically, the position confirmation jig 40 comprises a flat position confirmation plate and a plumb bob extending vertically downward from a portion of the position confirmation plate that is the core position of the pillar. In the above configuration, the position confirmation jig 40 is disposed at a position lower than the upper end of the anchor hanging jig 20 (bolt 22a). In other words, the position confirmation jig 40 is disposed so as not to block the position confirmation hole 22e. Therefore, when the confirmation rod 30 is inserted into the position confirmation hole 22e from above, interference between the confirmation rod 30 and the position confirmation jig 40 can be avoided.

[0031] <Foundation construction method> Next, a foundation construction method using the anchor hanging jig 20 will be described with reference to FIG. First, as shown in FIG. 1, the process begins with the "anchor support installation process" (step S1) in which a foundation worker installs an anchor bolt support F1 on the foundation ground F3 and fixes it using a fixing member (e.g., a concrete nail) not shown. At this time, by using a marking line drawn beforehand on the foundation ground F3 as a guide, the anchor bolt support F1 can be installed with high precision at a predetermined position (pillar erection position) on the foundation ground F3.

[0032] Thereafter, a worker performs an "anchor installation process" in which the anchor bolt F2 is installed on the anchor bolt support F1 (step S2), and further performs a "reinforcing bar assembly process" in which a reinforcing bar unit (not shown) is assembled (step S3). At this time, it is preferable to assemble a reinforcing bar unit (not shown) so as to hold the installed anchor bolts F2 from the side. The order of steps S2 and S3 may be reversed. In that case, it is preferable to install the reinforcing bar unit and then install the anchor bolts F2 from above in the area surrounded by the reinforcing bar unit.

[0033] Thereafter, as shown in FIG. 1, workers perform a "formwork assembly process" in which they assemble foundation formwork 10A and foundation formwork 10B facing each other on both sides of the width of the space that will form the foundation (step S4), and then perform a "jig erection process" in which they erect an anchor hanging jig 20 on top of foundation formwork 10 (step S5).

[0034] Thereafter, as shown in Figs. 1, 3 and 4, an operator performs an "anchor assembling process" in which the anchor bolt F2 is assembled so as to be suspended from the anchor hanging jig 20 (step S6). At this time, the bolt 22a and the nut 22d are connected to the anchor bolt F2 as a single unit, and by adjusting the assembly position of the bolt 22a or the nut 22d relative to the anchor ruler 21, the height position of the anchor bolt F2 can be changed.

[0035] Thereafter, as shown in Figs. 4 to 6, an "anchor checking step" is performed to check the height position of the assembled anchor bolt F2 (step S7). Specifically, an inspection rod 30 for checking the height position of the anchor bolt F2 is inserted into a position checking hole 22e formed in the anchor hanging jig 20 and brought into contact with the upper end of the anchor bolt F2. In this way, it is possible to check the height position of the anchor bolt F2 with high accuracy. If the height position of the anchor bolt F2 does not satisfy the design tolerance, the process returns to step S6, and the height position of the anchor bolt F2 is adjusted.

[0036] After completing step S7, the series of work steps is completed. After completing the work steps, the foundation construction jig 1 is removed. By carrying out the above steps S1 to S7, the anchor bolt F2 is positioned with high precision. Specifically, the anchor bolt F2 can be positioned in the horizontal direction by the anchor bolt support F1 and the anchor ruler 21. In addition, the anchor bolt F2 can be positioned in the height direction by the anchor height adjustment member 22. The anchor support member F1b of the anchor bolt support F1 may be configured to be height adjustable using, for example, a bolt and nut mechanism, so that the height position of the anchor bolt F2 can be changed by rotating the anchor bolt F2 itself that engages with the anchor support member F1b.

[0037] In the above foundation construction method, the order of each work step may be changed as appropriate. For example, the "formwork assembling process" in S4 and the "jig erecting process" in S5 may be performed before the "anchor support installing process" in S1, the "anchor installing process" in S2, and the "rebar assembling process" in S3. At that time, the "anchor installation step" of S2 and the "anchor assembly step" of S6 may be performed simultaneously. Also, for example, the anchor bolt support F1 may be unnecessary, in which case the "anchor support installation step" S1 can be omitted.

[0038] <Other embodiments> In the above embodiment, the position confirmation hole 22e is formed in the anchor height adjustment member 22 (bolt 22a) of the anchor hanging jig 20, but this is not particularly limited and can be modified. Specifically, it is sufficient that the position confirmation hole 22e is formed in a portion of the anchor hanging jig 20 that corresponds to a position directly above the anchor bolt F2. For example, when the anchor ruler 21 is disposed in a position directly above the anchor bolt F2, it is preferable that the position confirmation hole 22e is formed in the anchor ruler 21. Furthermore, for example, when the anchor ruler 21 and the anchor height adjustment member 22 are disposed directly above the anchor bolt F2, it is preferable that the position confirmation hole 22e is formed in both the anchor ruler 21 and the anchor height adjustment member 22.

[0039] In the above embodiment, the position confirmation hole 22e is formed to a size that allows the insertion of an confirmation rod 30 for confirming the height position of the upper end of the anchor bolt F2, but this can be changed without being particularly limited. Specifically, the position confirmation hole 22e may be formed to a size that allows a member formed in a predetermined shape to be inserted therein. For example, an L-shaped rod or plate may be inserted from the upper end of position confirmation hole 22e and brought into contact with the upper end of anchor bolt F2 to confirm the height position of the anchor bolt. Furthermore, the position confirmation hole 22e may be formed to a size that allows the passage of laser light from a laser measuring device such as a laser rangefinder. For example, a laser distance meter may be placed at the upper end of the position confirmation hole 22e, and a laser beam may be used to confirm the distance from the upper end of the position confirmation hole 22e to the upper end of the anchor bolt.

[0040] In the above embodiment, as shown in Figures 3 and 4, the anchor height adjustment member 22 is provided with a "height adjustment means" consisting of the bolt 22a and the nut 22d, but the height adjustment means is not particularly limited and can be changed. Specifically, a known height adjustment means using a mechanical structure may be used. For example, a "height adjustment means" using a jack or the like may be used at the lower end of the anchor bolt.

[0041] In the above embodiment, the anchor hanging jig 20 and the foundation construction method according to the present invention have been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0042] F Basics F1 Anchor bolt support F1a Base material F1b Anchor support member F1c Reinforced concrete support member F2 Anchor bolt F2a Anchor body F2b Anchor screw part F2c Anchor fixing part F3 Foundation ground (spare concrete) 1 Foundation construction jig 10 (10A, 10B) Foundation formwork 20 Anchor hanging fixture 21 Anchor Ruler 21a Formwork fixing part 21b Anchor support 21c Connecting part 21d Mounting hole 22 Anchor height adjustment member 22a Bolt (long bolt) 22b, 22c Clamping nut 22d Nut (height adjustment nut) 22e Position confirmation hole 22f Welding 30 Check Stick 31 Scale 40 Position Check Jig

Claims

1. An anchor hanging jig that is attached to the top of a foundation formwork and used to embed an anchor bolt in foundation concrete with a part of the anchor bolt protruding, An anchor ruler that is installed on an upper portion of the foundation formwork and that is used to position the anchor bolt in a horizontal direction; an anchor height adjustment member that extends long in the vertical direction, is connected to the anchor ruler so as to penetrate the anchor ruler in the vertical direction, and is attached in a state in which a height position of the anchor bolt can be changed relative to the anchor ruler; a position confirmation hole is formed in the anchor height adjustment member, the position confirmation hole penetrating vertically from an upper end of the anchor height adjustment member to an upper end of the anchor bolt, in order to confirm a height position of the anchor bolt when the anchor bolt is suspended; The anchor height adjustment member is The anchor includes a bolt that is long in the vertical direction and is assembled through an assembly hole provided in the anchor ruler, and a nut that is screwed onto a shaft portion of the bolt, The height position of the anchor bolt can be changed by adjusting the assembly position of the bolt or the nut with respect to the anchor ruler, The bolt is provided with the position confirmation hole, An anchor hanging jig characterized in that the position confirmation hole penetrates the bolt along the axial direction from the upper end to the lower end of the bolt.

2. 2. The anchor hanging jig according to claim 1, wherein the position confirmation hole is formed to a size that allows an inspection rod for confirming the height position of the anchor bolt to be inserted therein.

3. A foundation construction method using the anchor hanging jig described in claim 1, a formwork assembling process for assembling the foundation formwork; a jig installation process for installing the anchor hanging jig on the upper part of the foundation formwork; an anchor assembling process of assembling the anchor bolt to the anchor hanging jig so as to hang it thereon; and an anchor confirmation step of confirming a height position of the assembled anchor bolt, The anchor confirmation step is a foundation construction method characterized in that, in order to confirm the height position of the anchor bolt when it is suspended, the height position of the upper end of the anchor bolt is confirmed by the position confirmation hole that penetrates vertically from the upper end of the anchor suspension jig to the upper end of the anchor bolt.

4. In the anchor confirmation step, A confirmation rod for confirming the height position of the anchor bolt is inserted into the position confirmation hole from above the anchor hanging jig; 4. The foundation construction method according to claim 3, wherein the inserted confirmation rod is brought into contact with an upper end of the anchor bolt.

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