JP7663431B2 - Anchor bolt support, foundation construction method, and anchor bolt used in the foundation construction method - Google Patents

Description

The present invention relates to an anchor bolt support, a foundation construction method, and an anchor bolt used in the foundation construction method, and in particular to an anchor bolt support that is embedded in foundation concrete together with the anchor bolt and supports the anchor bolt from below, a foundation construction method, and an anchor bolt used in the foundation construction method.

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.

Conventionally, in order to install the above-mentioned anchor bolts, an anchor bolt support is used which supports the anchor bolt and is placed within a foundation formwork (see, for example, Patent Document 1).
The anchor bolt support described in Patent Document 1 is composed of a base member provided on the foundation ground, a support member erected from the base member, and an anchor holding portion provided on the upper part of the support member and capable of adjusting the height.

JP 2010-37940 A

Generally, when embedding an anchor bolt in foundation concrete, it is necessary to adjust the height position of the anchor bolt so that the upper end of the anchor bolt protrudes from the foundation concrete at a predetermined height.
For example, in the anchor bolt support described in Patent Document 1, the height position of the anchor bolt is adjusted by the anchor holding portion, whose height is adjustable.
However, since the anchor holding portion has a relatively complicated structure, there was a demand for technology that would enable easy adjustment of the height position of the anchor bolt.

When installing an anchor bolt, a reinforcing bar unit is also used to hold the anchor bolt.
The reinforcing bar unit is supported from below by, for example, a spacer, and the installation work for the spacer must be carried out separately.
Therefore, there was a demand for a technology that would eliminate the need for spacers and allow the reinforcing bar units to be easily installed.

The present invention has been made in consideration of the above problems, and an object of the present invention is to provide an anchor bolt support that enables easy adjustment of the height position of an anchor bolt when constructing the foundation of a building, a foundation construction method, and an anchor bolt used in the foundation construction method.
Another object of the present invention is to provide an anchor bolt support that enables a reinforcing bar unit to be easily installed by utilizing the anchor bolt support, a foundation construction method, and an anchor bolt used in the foundation construction method.

The above problem is solved by an anchor bolt support of the present invention, which is used when constructing a foundation for a building, is embedded in foundation concrete together with an anchor bolt, and supports the anchor bolt from below, the anchor bolt support comprising: a base member installed on the foundation ground; and an anchor support member protruding upward from the base member and provided in a state in which its height position can be changed relative to the base member, supporting the anchor bolt from below, the anchor support member comprising: a nut member attached to the base member, protruding upward from the base member, and elongated in the vertical direction; and a bolt member screwed into the nut member from above, the bolt member being provided at an upper end of the bolt member and having an anchor engaging portion that engages detachably in the vertical direction with an engaged portion provided at a lower end of the anchor bolt, and the anchor support member is configured to be able to change the height position of the anchor bolt by adjusting the screwing position of the bolt member relative to the nut member .
With the above configuration, it is possible to realize an anchor bolt support that allows the height position of the anchor bolt to be easily adjusted when constructing the foundation of a building.
In more detail, the anchor support member has an anchor engaging portion that is detachably engaged with the engaged portion of the anchor bolt in the vertical direction, and is configured to be able to change the height position of the anchor bolt. In other words, the height position of the anchor bolt can be changed while the anchor bolt support (anchor support member) is engaged with the anchor bolt.
Furthermore, with the above-described configuration, the height position of the anchor bolt can be adjusted more easily with a simple configuration such as a bolt and nut mechanism.

Furthermore, the above problem is solved by an anchor bolt support used when constructing a foundation for a building, embedded together with an anchor bolt in foundation concrete and supporting the anchor bolt from below, the anchor bolt support comprising: a base member installed on the foundation ground; and an anchor support member protruding upward from the base member and provided in a state in which its height position can be changed relative to the base member and supporting the anchor bolt from below, the anchor support member being provided at an upper end of the anchor support member and having an anchor engaging portion that is detachably engaged in the vertical direction with an engaged portion provided at a lower end of the anchor bolt, and supporting the anchor bolt so that its height position can be changed, the anchor bolt support is provided at a position on the base member different from that of the anchor support member, and has a reinforcing bar support member that protrudes upward from the base member and supports a reinforcing bar unit, the reinforcing bar support member having a vertical support portion that supports the reinforcing bar unit from below, and a horizontal holding portion that protrudes upward from an outer end of the vertical support portion and holds the reinforcing bar unit from the side.
With the above-described configuration, the reinforcing bar unit can be easily installed using the anchor bolt support without the need for supporting it from below using a spacer or the like.

In this case, it is preferable that the anchor support members are provided in multiple locations at a predetermined interval on the outer periphery of the base member, the reinforcing bar support members are provided in multiple locations at a predetermined interval on the outer periphery of the base member, and the anchor support members and the reinforcing bar support members are arranged alternately.
With the above-mentioned configuration, the anchor support members and the reinforcing bar support members can be arranged in a well-balanced manner on the outer periphery of the base member without interfering with each other. Also, by arranging the anchor support members and the reinforcing bar support members on the outer periphery of the base member with a space between each other, it is possible to stably support a plurality of anchor bolts and reinforcing bar units.

In this case, it is preferable that the base member is made of a flat plate body, and that a confirmation hole is formed in the central portion of the base member through which the reference line drawn on the foundation ground can be visually confirmed.
With the above-mentioned configuration, the base member can be accurately installed at a predetermined position (pillar installation position) on the foundation ground using the reference line as a landmark.

The above-mentioned problem is solved by a method for constructing a foundation for a building using an anchor bolt support which is used when constructing the foundation of a building, is embedded in foundation concrete together with an anchor bolt, and supports the anchor bolt from below, the method including an anchor support installation step of installing the anchor bolt support on the foundation ground, the anchor support including a base member and an anchor support member which protrudes upward from the base member and is provided in a state in which its height position can be changed with respect to the base member; an anchor installation step of installing the anchor bolt on the anchor bolt support; an anchor adjustment step of adjusting the height position of the anchor bolt installed on the anchor bolt support; and a reinforcing bar supporting step of supporting a reinforcing bar unit on the anchor bolt support device having a reinforcing bar support member protruding above the base member , wherein in the anchor installation step, an anchor engaging portion provided at an upper end of the anchor support member is engaged with an engaged portion provided at a lower end of the anchor bolt so as to be detachable in the vertical direction, in the anchor adjustment step, the height position of the anchor bolt is changed by the anchor support member, and in the reinforcing bar support step, the reinforcing bar unit is supported on the reinforcing bar support member having a vertical support portion that supports the reinforcing bar unit from below and a horizontal holding portion that protrudes upward from an outer end of the vertical support portion and holds the reinforcing bar unit from the side .
With the above configuration, the reinforcing bar support member protrudes above the base member and supports the reinforcing bar unit from below, eliminating the need for spacers, etc., and the reinforcing bar unit can be easily installed using an anchor bolt support.

The above problem is also solved by an anchor bolt used in the above foundation construction method, characterized in that the anchor bolt is detachably engaged in the vertical direction with the anchor engagement portion of the anchor support member, and has the engaged portion formed as a polygonal recess or protrusion.

According to the anchor bolt support, the foundation construction method, and the anchor bolt used in the foundation construction method of the present invention, it becomes possible to easily adjust the height position of the anchor bolt when constructing the foundation of a building.
In addition, the reinforcing bar unit can be easily installed using the anchor bolt support.

FIG. 2 is a perspective view showing a state in which an anchor bolt is installed in the anchor bolt support. FIG. 2 is a perspective view showing a state in which an anchor bolt and a reinforcing bar unit are supported by the anchor bolt support. FIG. 2 is a perspective view showing an anchor bolt support (a base member, an anchor support member, and a reinforcing bar support member). FIG. 2 is an enlarged perspective view showing a lower end portion of the anchor bolt. FIG. 4 is an explanatory diagram showing an engagement state between an anchor bolt and an anchor bolt support (bolt member). FIG. 13 is an explanatory diagram showing a state in which the height position of the anchor bolt has been changed. 1 is a perspective view showing a state in which a reinforcing bar unit (hoop) is supported by a reinforcing bar support member. FIG. This is a process diagram showing a method for constructing the foundation of a building.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The present embodiment relates to an invention of an "anchor bolt support" that is used when constructing a foundation for a building, is embedded in foundation concrete together with an anchor bolt, and supports the anchor bolt from below.
The invention also relates to a "foundation construction method" for a building using the anchor bolt support.
The invention also relates to an "anchor bolt" used in the foundation construction method.

<Basics>
As shown in FIG. 1 , the following are embedded in the foundation 1: anchor bolt supports 40 that are installed on the foundation ground 30 (basic concrete); a plurality of anchor bolts 10 that are supported by the anchor bolt supports 40 and that connect the foundation 1 and the columns (column bases); and reinforcing bar units 20 (column-type reinforcing bar units) that are supported by the anchor bolt supports 40 and that are arranged so as to surround the plurality of anchor bolts 10.

As shown in Figures 1 and 2 , the anchor bolt 10 is mainly composed of an anchor body 11 that is long in the vertical direction and forms the main body of the anchor bolt 10, an anchor thread portion 12 that extends upward continuously from the anchor body 11, and a disk-shaped anchor fixing portion 13 that is provided at the lower end of the anchor body 11.
The anchor bolt 10 is assembled by being suspended from above by a foundation construction jig J, and is supported from below by an anchor bolt support 40.

1, the anchor bolt 10 is assembled so as to be suspended from an anchor hanging jig J20 of a foundation construction jig J. More specifically, the anchor screw portion 12 is screwed into a height adjustment nut J22d of an anchor height adjustment member J22 of the anchor hanging jig J20.
As shown in Figures 4 and 5, an engaged portion 13a is formed on the bottom surface of the anchor fixing portion 13. The engaged portion 13a is adapted to detachably engage in the vertical direction with an anchor engaging portion 42c provided on the upper end portion of the anchor bolt support 40 (anchor support member 42).
The engaged portion 13 a is a hexagonal recess formed in the center of the bottom surface of the anchor fixing portion 13 .
The engaged portion 13a is not limited to a hexagonal recess, and may be formed as a polygonal recess such as a triangular or rectangular shape. Alternatively, it may be formed as a polygonal protrusion.

As shown in FIG. 2 , the reinforcing bar unit 20 is a unit member that is supported by the reinforcing bar supporting member 43 of the anchor bolt support 40 and is disposed so as to surround a plurality of anchor bolts 10 .
The reinforcing bar unit 20 has a plurality of tie bars 20a that surround and hold the anchor bolt 10, and a plurality of column bars 20b that are connected vertically to the plurality of tie bars 20a.
The tie bars 20a are arranged in a row at a predetermined interval in the vertical direction and are connected to column bars 20b erected at predetermined positions, so that the multiple tie bars 20a and the multiple column bars 20b are integrated.
The tie bars 20a are formed in a substantially rectangular loop shape and are made of rod-shaped members. The tie bars 20a are overlapped with each other vertically at predetermined portions.
The column reinforcement 20b is a rod-shaped member similar to the hoop reinforcement 20a, such as a steel bar member.

<Foundation construction jig>
As shown in Figure 1, the foundation construction jig J is a jig used when constructing the foundation 1 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 J is used when pouring foundation concrete and is mainly composed of a foundation formwork J10 assembled to match the shape of the foundation 1, and an anchor hanging jig J20 that is erected on top of the foundation formwork J10 and used to embed multiple anchor bolts 10 in the foundation concrete with some of them protruding.

As shown in Figure 1, the foundation formwork J10 is a formwork that is provided so as to face both sides in the width direction of the foundation 1 (the space that will become the foundation 1) and is arranged along the extension direction of the foundation 1.
An anchor hanging jig J20 (anchor ruler J21) is attached to the upper surface of the assembled foundation formwork J10 (J10A, J10B) along the extension direction of the foundation 1.
In addition, part of the foundation formwork J10 is omitted in FIG.

As shown in FIG. 1, the anchor hanging jig J20 is installed on the top surface of the foundation formwork J10 and includes an anchor ruler J21 for positioning the anchor bolt 10 in the horizontal direction, and an anchor height adjustment member J22 that extends vertically and connects the anchor ruler J21 to the anchor bolt 10 and is attached in a state in which the height position of the anchor bolt 10 can be changed relative to the anchor ruler J21.

As shown in FIG. 1, the anchor ruler J21 is made of a frame-shaped body made up of flat plates, and is fixed to the upper surface of the foundation formwork J10 using fastening members.
Specifically, the anchor ruler J21 has a frame-shaped formwork fixing part J21a that is fixed to the upper surface of the foundation formwork J10, a frame-shaped anchor support part J21b that is positioned more inward than the formwork fixing part J21a and supports a plurality of anchor height adjustment members J22, and a plurality of connecting parts J21c that connect the formwork fixing part J21a and the anchor support part J21b.
The anchor support portion J21b has a rectangular frame shape, and the four corners of the anchor support portion J21b are each formed with an assembly hole J21d for assembling the anchor height adjustment member J22.

As shown in FIG. 1, the anchor height adjustment member J22 is mainly composed of a long bolt J22a that extends in the vertical direction and passes through the anchor ruler J21 (assembly hole J21d), a clamping nut J22b and a clamping nut J22c that are screwed onto the long bolt J22a and clamp the anchor ruler J21 in the vertical direction, and a height adjustment nut J22d (long nut) that is screwed onto the long bolt J22a from above and extends in the vertical direction.
Furthermore, the anchor threaded portion 12 of the anchor bolt 10 is screwed into the lower portion of the height adjustment nut J22d, so that the height adjustment nut J22d and the anchor bolt 10 are integrally connected.

In the above configuration, the anchor height adjustment member J22 can change the height position of the anchor bolt 10 relative to the anchor ruler J21 by adjusting the screwing position of the height adjustment nut J22d relative to the long bolt J22a.
<Anchor bolt support>

As shown in Figures 1 to 3, the anchor bolt support 40 comprises a plate-shaped base member 41 that is installed at a predetermined position on the foundation ground 30, a number of anchor support members 42 that are provided on the base member 41 and support the anchor bolt 10 from below, and a number of reinforcing bar support members 43 that are provided on the base member 41 and support the reinforcing bar unit 20 from below and laterally.

As shown in FIGS. 1 to 3, the base member 41 is a flat plate body formed in a substantially rectangular shape.
A generally rectangular confirmation hole 41 a is formed in the center of the base member 41 .
A plurality of triangular cutouts 41b are formed at predetermined intervals around the outer periphery of the confirmation hole 41a.
When installing the anchor bolt support 40 on the foundation ground 30, a reference line (marked line) drawn in advance on the foundation ground 30 is visually confirmed through the confirmation hole 41a, and the reference line (marked line) is used as a landmark to align the positions of the notched portion 41b and the reference line (marked line). This allows the anchor bolt support 40 to be installed with high precision at a predetermined position (pillar erection position) on the foundation ground 30.

The base member 41 has a circular fixing hole 41c for fixing the base member 41 onto the foundation ground 30.
A plurality of fixing holes 41c are provided at predetermined intervals so as to surround the confirmation hole 41a.
The fixing holes 41c are used to fix the base member 41 onto the foundation ground 30 using a fixing member (not shown) (e.g., a concrete nail).

As shown in Figs. 1 and 2, the anchor support member 42 is a member that supports the anchor bolt 10 from below and determines the position of the anchor bolt 10 in the horizontal and vertical directions.
The anchor support members 42 protrude upward from the base member 41 and are provided in plurality on the outer periphery of the base member 41 .
An anchor engaging portion 42c is formed at the upper end of the anchor support member 42, and the anchor engaging portion 42c engages with an engaged portion 13a provided at the lower end of the anchor bolt 10 so as to be detachable in the vertical direction.
The anchor support member 42 is configured so that the height position of the anchor bolt 10 is changeable, and the height position (initial height position) of the anchor bolt 10 can be adjusted.
3, the anchor support member 42 has a nut member 42a attached to the base member 41 and a bolt member 42b screwed into the nut member 42a from above. By adjusting the screwing positions of the nut member 42a and the bolt member 42b, it is possible to change the height position of the anchor bolt 10.

The nut member 42 a is formed long in the vertical direction and protrudes upward from the base member 41 .
The nut member 42a is attached to the outer periphery of the base member 41 by, for example, welding.
Specifically, the nut members 42a are attached to the four corners of the substantially rectangular base member 41 at predetermined intervals.

The bolt member 42b is screwed into the nut member 42a from above.
The bolt member 42b has an anchor engaging portion 42c formed at its upper end in a hexagonal column shape.
5 and 6, the anchor engaging portion 42c is detachably engaged in the up-down direction with the engaged portion 13a formed in the anchor fixing portion 13. The anchor engaging portion 42c may be in a polygonal prism shape other than a hexagonal prism shape in accordance with the shape of the engaged portion 13a.
By adjusting the screw-fitting position of the bolt member 42b relative to the nut member 42a, the height position of the anchor engagement portion 42c relative to the base member 41 can be changed. In other words, by adjusting the screw-fitting position of the bolt member 42b relative to the nut member 42a, the height position of the anchor bolt 10 can be changed.
At this time, the lengths of the nut member 42a and the bolt member 42b are set to predetermined lengths so that a predetermined covering thickness can be secured for the lower end portion (anchor fixing portion 13) of the anchor bolt 10.

As shown in Figs. 1 to 3 and 7, the reinforcing bar support member 43 is a member for supporting the reinforcing bar unit 20 and for positioning the reinforcing bar unit 20 in the horizontal and vertical directions.
The reinforcing bar support member 43 is a flat plate formed in a substantially rectangular shape.
The reinforcing bar support member 43 is formed by cutting and raising a portion of the base member 41 , and protrudes above the base member 41 .
The reinforcing bar support members 43 are provided at four locations on the outer periphery of the approximately rectangular base member 41 at predetermined intervals.
Specifically, the reinforcing bar support member 43 has a vertical support portion 43a that supports the reinforcing bar unit 20 from below, and a horizontal support portion 43b that holds the reinforcing bar unit 20 from the side.

The vertical support portion 43 a is a generally rectangular flat plate that protrudes above the base member 41 .
The hoop 20a located at the bottom of the reinforcing bar unit 20 is placed on the upper surface of the vertical support portion 43a.
At this time, the ties 20a overlap each other vertically at a predetermined portion of the ties 20a. Therefore, the heights of the vertical support parts 43a are formed to be slightly different so that the height positions of the ties 20a are aligned when the reinforcing bar unit 20 is installed.
For example, in order to level out the height difference of 13 mm in diameter of the tie bar 20a, the height of each vertical support portion 43a is designed to increase or decrease in sequence along the extension direction of the tie bar 20a.

The horizontal support portion 43b is a protrusion that protrudes further upward from the vertical support portion 43a.
The horizontal support portion 43b is provided at the outer end of the vertical support portion 43a.
Moreover, the horizontal holding portions 43b are provided at four locations at predetermined intervals on the outer periphery of the base member 41. Therefore, it is possible to prevent the reinforcing bar unit 20 from rotating when the reinforcing bar unit 20 is installed.

In the above-described configuration, as shown in FIG. 3, the reinforcing bar support member 43 is provided at a position different from that of the anchor support member 42.
Specifically, the reinforcing bar support members 43 and the anchor support members 42 are arranged alternately at predetermined intervals on the outer periphery of the base member 41 .
Therefore, the reinforcing bar support members 43 and the anchor support members 42 can be arranged in a well-balanced manner on the outer periphery of the base member 41 without interfering with each other. Also, by arranging the reinforcing bar support members 43 and the anchor support members 42 on the outer periphery of the base member 41 with a space therebetween, it is possible to stably support a plurality of anchor bolts 10 and reinforcing bar units 20.

<Foundation construction method>
Next, a foundation construction method using the anchor bolt support 40 will be described with reference to FIG.
First, as shown in FIG. 1, the process starts with an "anchor support installation process" (step S1) in which a foundation worker installs an anchor bolt support 40 on the foundation ground 30 and fixes it using a concrete nail.
At this time, by using a reference line drawn in advance on the foundation ground 30 as a mark, the anchor bolt support 40 can be installed with high precision at a predetermined position (pillar erection position) on the foundation ground 30.
The anchor bolt support 40 is installed in a recess formed in advance in the foundation ground by a retaining formwork (not shown).

Thereafter, as shown in FIG. 2, an operator performs an "anchor installation step" in which the anchor bolt 10 is installed on the anchor bolt support 40 (step S2).
At this time, the anchor engaging portion 42c of the anchor support member 42 is detachably engaged with the engaged portion 13a of the anchor bolt 10 in the up-down direction.
Thereafter, as shown in FIG. 2, a "reinforcing bar supporting step" is performed in which the reinforcing bar unit 20 is supported on the reinforcing bar supporting member 43 (step S3).

Thereafter, as shown in Figs. 5 and 6, an "anchor adjustment step" is performed in which the height position of the anchor bolt 10 is adjusted while the anchor engaging portion 42c and the engaged portion 13a are engaged with each other (step S4).
Specifically, the initial height position of the anchor bolt 10 is adjusted by adjusting the screwing position of the bolt member 42b relative to the nut member 42a in the anchor support member 42.
At this time, it is preferable that the initial height position of the anchor bolt 10 is adjusted to the minimum covering thickness of the anchor bolt 10. For example, it is preferable that the minimum covering thickness of the anchor bolt 10 is adjusted to about 40 mm.

After that, as shown in FIG. 1, workers perform a "form assembly process" in which they assemble the foundation formwork J10 on both sides of the width of the space that will become the foundation so that they face each other (step S5), and then perform a "jig erection process" in which they erect an anchor hanging jig J20 on top of the foundation formwork J10 (step S6).

Thereafter, as shown in FIG. 1, an operator performs an "anchor assembling process" in which the anchor bolt 10 is assembled so as to be suspended from the anchor suspension jig J20 (step S7).
At this time, by adjusting the screwing position of the height adjustment nut J22d with respect to the long bolt J22a, it is possible to change the height position of the anchor bolt 10 with respect to the anchor ruler J21.
For example, if the initial height of the anchor bolt 10 is shifted due to vibration during work, interference with the reinforcing bar unit 20, pouring concrete, or the like, the height position of the anchor bolt 10 can be fine-tuned afterwards.
At this time, the height position of the anchor bolt 10 can be adjusted by rotating the height adjustment nut J22d.

By carrying out the above steps S1 to S7, the anchor bolt 10 is positioned. Specifically, the anchor bolt 10 can be positioned in the horizontal direction by the anchor bolt support 40 and the anchor ruler J21.
In addition, the anchor bolt 10 can be positioned in the height direction by the anchor support member 42 and the anchor height adjustment member J22.
After the process of step S7 is completed, the series of work processes is completed. After the work processes are completed, the foundation construction jig J is removed.

In the above foundation construction method, the order of each work step may be changed as appropriate.
For example, the "formwork assembly process" in S5 and the "jig erection process" in S6 may be performed before the "support installation process" in S1, the "anchor installation process" in S2, and the "rebar support process" in S3. In that case, the "anchor installation process" in S2 and the "anchor assembly process" in S7 may be performed simultaneously.
Also, for example, the "anchor installation step" in S2 and the "reinforcing bar support step" in S3 may be interchanged. In this case, the anchor bolt 10 is installed from above in the area surrounded by the reinforcing bar units 20. In this way, the anchor bolt 10 can be installed while being appropriately supported from the side.

<Other embodiments>
In the above embodiment, as shown in Figs. 5 and 6, the anchor support member 42 has the nut member 42a and the bolt member 42b, but this is not particularly limited and can be modified.
For example, the anchor support member 42 may have only the nut member 42a.
Specifically, the anchor bolt 10 may have a bolt shank at its lower end.
At this time, the bolt shank is screwed into the nut member 42a from above, and the height position of the anchor bolt 10 can be changed by adjusting the screwing position.

In the above embodiment, as shown in Figures 5 and 6, the anchor support member 42 has the nut member 42a and the bolt member 42b, making it possible to change the height position of the anchor bolt 10, but the height position can be changed without any particular limitation.
For example, a known "height adjustment means" using a mechanical structure may be employed.
Specifically, a "height adjustment means" using a jack or the like may be adopted at the lower end of the anchor bolt 10.
In addition, a "height adjustment means" utilizing a winch or the like may be adopted at the upper end of the anchor bolt 10.

In the above embodiment, as shown in FIG. 1, the reinforcing bar support member 43 is configured to protrude upward from the base member 41, but this is not particularly limited and can be modified.
For example, the reinforcing bar support member 43 may be attached so as to protrude downward from the lowermost tie bar 20a of the reinforcing bar unit 20.
For example, the tie bars 20a at the upper end of the reinforcing bar unit 20 may be fixed to the anchor ruler J21, and the reinforcing bar unit 20 may be suspended from the anchor ruler J21.

In the above embodiment, the anchor bolt support 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 or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof.

Reference Signs List 1 Foundation 10 Anchor bolt 11 Anchor body 12 Anchor screw portion 13 Anchor fixing portion 13a Engaged portion 20 Reinforcing bar unit 20a Hoop 20b Column bar
30 Foundation ground (split concrete)
40 Anchor bolt support 41 Base member 41a Confirmation hole 41b Notch portion 41c Fixing hole 42 Anchor support member 42a Nut member 42b Bolt member 42c Anchor engagement portion 43 Reinforcement bar support member 43a Vertical support portion 43b Horizontal holding portion J Foundation construction jig J10 (J10A, J10B) Foundation formwork J20 Anchor hanging jig J21 Anchor ruler J21a Formwork fixing portion J21b Anchor support portion J21c Connection portion J21d Assembly hole J22 Anchor height adjustment member J22a Long bolt J22b, J22c Clamping nut J22d Height adjustment nut

Claims (6)

An anchor bolt support used when constructing a foundation for a building, which is embedded in foundation concrete together with an anchor bolt and supports the anchor bolt from below,
A base member installed on the foundation ground;
an anchor support member that protrudes upward from the base member, is provided in a state in which its height position can be changed with respect to the base member, and supports the anchor bolt from below,
The anchor support member is
A nut member that is attached to the base member, protrudes upward from the base member, and is long in the vertical direction;
A bolt member that is screwed into the nut member from above,
the bolt member has an anchor engaging portion provided at an upper end of the bolt member and detachably engaging with an engaged portion provided at a lower end of the anchor bolt in a vertical direction;
The anchor bolt support device is characterized in that the anchor support member is configured so that a height position of the anchor bolt can be changed by adjusting a screwing position of the bolt member with respect to the nut member . An anchor bolt support used when constructing a foundation for a building, which is embedded in foundation concrete together with an anchor bolt and supports the anchor bolt from below,
A base member installed on the foundation ground;
an anchor support member that protrudes upward from the base member, is provided in a state in which its height position can be changed with respect to the base member, and supports the anchor bolt from below,
The anchor support member is
an anchor engaging portion provided at an upper end of the anchor support member and detachably engaging with an engaged portion provided at a lower end of the anchor bolt in a vertical direction;
supporting the anchor bolt so that a height position of the anchor bolt can be changed;
The anchor bolt support has a reinforcing bar support member that is provided at a position on the base member different from the anchor support member, protrudes upward from the base member, and supports a reinforcing bar unit,
The reinforcing bar support member is
A vertical support portion that supports the reinforcing bar unit from below;
a horizontal support portion protruding upward from an outer end portion of the vertical support portion and holding the reinforcing bar unit from the side . The anchor support members are provided at a plurality of positions at predetermined intervals on the outer periphery of the base member,
The reinforcing bar support members are provided at a predetermined interval on the outer periphery of the base member,
3. The anchor bolt support according to claim 2 , wherein the anchor support members and the reinforcing bar support members are arranged alternately. The base member is made of a flat plate body,
4. The anchor bolt support according to claim 1 , wherein a confirmation hole through which a reference line drawn on the foundation ground can be visually confirmed is formed in a central portion of the base member. A method for constructing a foundation of a building using an anchor bolt support that is used when constructing the foundation of a building, is embedded in foundation concrete together with an anchor bolt, and supports the anchor bolt from below, comprising the steps of:
an anchor support installation process for installing the anchor bolt support, which includes a base member and an anchor support member that protrudes upward from the base member and is provided in a state in which its height position can be changed relative to the base member, on a foundation ground;
an anchor installation step of installing the anchor bolt on the anchor bolt support;
an anchor adjusting step of adjusting a height position of the anchor bolt installed on the anchor bolt support;
a reinforcing bar supporting step of supporting a reinforcing bar unit on the anchor bolt support provided at a position different from the anchor support member on the base member and including a reinforcing bar support member protruding above the base member ,
In the anchor installation step, an anchor engaging portion provided at an upper end of the anchor support member is engaged with an engaged portion provided at a lower end of the anchor bolt so as to be detachable in the vertical direction,
In the anchor adjustment step, a height position of the anchor bolt is changed by the anchor support member,
This foundation construction method is characterized in that in the reinforcing bar support process, the reinforcing bar unit is supported by the reinforcing bar support member, which has a vertical support portion that supports the reinforcing bar unit from below and a horizontal support portion that protrudes upward from the outer end of the vertical support portion and holds the reinforcing bar unit from the side . An anchor bolt used in the foundation construction method according to claim 5 ,
The anchor bolt used in the foundation construction method is characterized in that the anchor bolt detachably engages with the anchor engaging portion of the anchor support member in the vertical direction and has the engaged portion formed as a polygonal concave or convex portion.