JP2000080661A - Fixing structure of anchor member, and anchor planting hole molding jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure of an anchor member capable of improving drawing bearing force of the anchor member. SOLUTION: An anchor 101 projected downward from a lower surface of a building unit 100 formed in a box shape is inserted into an anchor planting hole 42 formed on a foundation 102 and fixed with mortar 104. The anchor planting hole 42 is formed in a truncated conical shape on which a bottom surface side is wide and an opening side is narrow. The mortar 104 solidified inside of this anchor planting hole 42 is formed wide on the bottom surface side and narrow on the opening side. Consequently, the bottom surface side of the mortar 104 fixing the anchor 101 is hooked on an inner surface of the foundation 102 even when the anchor 101 is drawn. Consequently, it is possible to improve drawing bearing force of the anchor 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing structure of an anchor member projecting downward from a lower surface of a box-shaped building unit and an anchor used when fixing the box-shaped building unit to a foundation. The present invention relates to a planting hole forming jig.

[0002]

2. Description of the Related Art Conventionally, unit-type buildings constructed by combining a plurality of box-shaped building units manufactured in a factory at a building site have been used. As a building unit forming a unit building, a building unit having a rectangular parallelepiped frame in which upper and lower ends of four pillars are connected by a ceiling beam and a floor beam is generally used. In the factory, the frame of the building unit includes, in a factory, ceiling surface materials supported by ceiling beams, flooring materials supported by floor beams, and interior materials such as partition walls for partitioning a roof, and lightweight foam concrete plates (hereinafter, referred to as “walls”). An outer wall material or the like made of “ALC plate” is attached. According to such a unit-type building, the work of assembling the interior material and the outer wall material to the building unit is performed in the factory, and thereafter, only the fixing work between the building units and between the building unit on the first floor and the foundation is performed. Thus, since the building is completed, the work at the construction site is greatly reduced, and there is an advantage that the construction work can be completed in a short time.

Here, the fixing between the building unit and the foundation is as follows.
An anchor planting hole is provided on the upper surface of the foundation, and after grout is filled in the anchor planting hole, an anchor projecting from the lower surface of the pillar of the building unit is inserted into the anchor planting hole, and the grout described above is inserted. Is carried out by solidification. The anchor implantation hole is formed by embedding a sheath tube which is an anchor implantation hole forming jig at the time of placing the foundation.

More specifically, FIG. 10 shows a building unit 100, and an anchor 101 protrudes from the lower surface of the building unit 100. On the other hand, in the foundation 102,
A sheath tube 103 embedded at the time of placing concrete is provided. As shown in FIG. 11, the fixing of the building unit 100 to the foundation 102 is carried out by curing the concrete of the foundation 102 and then injecting the sheath tube 10 into which the mortar 104 has been injected.
3 is performed by inserting an anchor 101 projecting from the lower surface of the pillar of the building unit 100. At this time, as shown in FIG. 12, the sheath tube 103 includes an iron main body 103A formed in a cylindrical shape, and a bottom lid 103B.

[0005]

Such a sheath tube originally has a role similar to that of a formwork for placing a foundation, and after the anchor planting hole is completed, the role is completed. So they are still embedded in concrete, even though they should be removed and reused. For this reason, there is a problem that an expensive iron sheath tube is wasted as a base member. Further, since the sheath tube embedded in the foundation is made of iron, if it is exposed from the foundation, there is a problem that rust is generated on the exposed portion by rainwater or the like, and the appearance of the foundation is impaired. In order to eliminate the need for a sheath tube having such a problem, the present applicant has proposed Japanese Patent Application Laid-Open No. Hei 5-79042, which discloses a method for forming a hole for anchor member planting and a method for forming the hole. The mold has a large number of parts, and the cost and labor of the work are not sufficiently reduced, and a more effective one is demanded. Further, since the anchor implantation hole formed by the cylindrical sheath tube has the same diameter from the bottom side to the opening side, the anchor is inserted into this interior, and is driven by mortar or the like. The anchor has a certain strength against an external force applied in a direction in which the anchor is pulled upward, but it is difficult to obtain a more excellent withdrawal strength with the anchor implantation hole formed in a cylindrical shape.

It is an object of the first invention to provide a fixing structure for an anchor member which improves the pull-out resistance of the anchor member. The second object of the present invention is to
An object of the present invention is to provide a jig for forming an anchor planting hole, in which a member for a foundation can be repeatedly used, waste of expensive parts for the foundation can be eliminated, and the appearance of the foundation can be improved.

[0007]

The first invention will be described with reference to the drawings.
An anchor member (for example, anchor 101) projecting downward from the lower surface of the base member 0 is inserted into an anchor planting hole 42 formed in the base 102 and is fixed with a mortar 104. The hole 42 is characterized in that the bottom side is wide and the opening side is narrow.
In the present invention, the mortar solidified inside the anchor planting hole is formed such that the bottom side is wide and the opening side is narrow. For this reason, even if it tries to pull out an anchor member, the bottom side of the mortar which fixes the anchor member concerned is hooked on the inner surface of the foundation. Thereby, the anchor member
The withstand strength against the external force applied in the direction in which the anchor member is pulled upward is increased, and the withdrawal strength of the anchor member can be improved.

[0008] In the above description, the foundation 102 is made of concrete, and it is preferable that the side surface of the mortar 104 filled in the anchor planting hole 42 is in direct contact with the concrete of the foundation 102. In this way, if the side of the mortar is in direct contact with the concrete of the foundation and the anchor planting hole forming jig is removed after forming the anchor planting hole, there is no problem such as rust, and the appearance of the foundation is improved. I do.

The second invention will be described with reference to the accompanying drawings.
In order to form an anchor planting hole 42 in the foundation 102 into which an anchor member projecting downward from the lower surface of the building unit 100 is inserted, the concrete is cast into the inside of the foundation forming formwork 40. An anchor planting hole forming jig 10A to be installed in a partition member 11A, a cylindrical partition member 11A obtained by rolling a soft surface material, a core member 12A housed inside the partition member 11A, and a partition member 11A.
A and an interposing member 13A made of a soft elastic material interposed between the core member 12A and the core member 12A, and are gradually thicker downward. In the present invention, since the interposition member is formed from the soft elastic body which can be easily deformed, the core member can be easily removed. If the core member is removed, the interposition member and the soft member can be removed. It becomes easy to remove the cylindrical partition member with the rounded surface material. Thereby, the member forming the anchor planting hole forming jig can be removed after the foundation has been cured, can be used repeatedly, and the cost required for fixing the building unit to the foundation can be reduced. There is no problem such as rust, and the appearance of the foundation is improved. Further, the partition member and the interposition member,
A synthetic resin material can be used, which reduces the number of metal parts and reduces the weight as a whole, so that handling and transportation are easy, and the work efficiency of foundation casting is improved. Furthermore, since the shape of the anchor planting hole forming jig is gradually becoming thicker downward, using the anchor planting hole forming jig forms an anchor planting hole having a wide bottom surface and a narrow opening side. You. For this reason, by inserting the anchor into the anchor planting hole and driving it with mortar or the like, the anchor has an increased strength against external force applied in the direction in which it is pulled upward, and improves the pull-out resistance of the anchor. Becomes possible.

[0010] In the above description, as the jig for forming an anchor planting hole that gradually becomes thicker downward, the intervening member 13A whose thickness is gradually increased downward.
Alternatively, a core member 12B formed in a truncated cone shape having a larger diameter on the lower surface than on the upper surface is used, or the core member 12C is formed in a columnar shape, and a convex portion 22C protruding from the side surface is provided. Extend from the upper end to the lower end of the core member 12C to increase the width of the convex portion 22C downward, or when expanded, the lower side is longer than the upper side. Anchor planting hole forming jigs 10A to 10D that can be formed by rolling 13D into a truncated cone shape can be adopted. When the anchor planting hole forming jig is formed in this manner, it is possible to easily form an anchor planting hole forming jig having a shape that gradually becomes thicker downward. That is, if an interposed member whose thickness is gradually increased downward, or a core member formed in a truncated conical shape in which the diameter of the lower surface is larger than the upper surface,
Since these parts are gradually becoming thicker downward, there is no need to form other members so that they become gradually thicker downward. It can be easily formed. Also,
For example, the interposition member is rounded into a cylindrical shape, is formed in a C-shaped cross section having a gap on a side surface thereof, and is provided on the core member and has a convex portion having a width increasing downward, and the interposition member is formed. If the gap at the lower end portion is arranged so as to widen, the shape of the interposition member gradually increases downward. Accordingly, if the partition member is provided on the intervening member, an anchor planting hole forming jig gradually thickening downward can be easily formed. Further, when the partition member and the interposition member are unfolded, the lower side is longer than the upper side, and if a so-called fan-shaped member is rounded and formed into a truncated cone shape, it is not limited to the shape of the core member, An anchor planting hole forming jig gradually increasing in thickness can be easily formed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a fixing structure of an anchor 101 which is an anchor member according to a first embodiment of the present invention. An anchor 101 projecting downward from the lower surface of the building unit 100 is a concrete foundation 102.
Is fixed in the mortar 104 filled in the anchor planting hole 42. Thus, the building unit 100 is fixed to the foundation 102. Here, the anchor planting hole 42
Is formed in a truncated cone shape with a wide bottom surface and a narrow opening side. The mortar 1 filled in the anchor planting hole 42
The side of 04 is in direct contact with the concrete forming the foundation 102.

FIGS. 2 and 3 show an anchor planting hole 42.
A molding jig 10 </ b> A for molding is shown. This forming jig 10A is used to form an anchor planting hole 42 in the base 102 into which the anchor 101 projecting downward from the lower surface of the building unit 100 is inserted. It is installed inside.

The forming jig 10A includes a partition member 11A obtained by rolling a sheet made of vinyl chloride as a soft surface material, and a core member 12A housed inside the partition member 11A.
And an interposing member 13A made of foamed polyethylene, which is a soft elastic body, interposed between the partition member 11A and the core member 12A. The outer shape of the forming jig 10A has a truncated cone shape that gradually becomes thicker downward.

The partition member 11A is attached to the surface of the interposition member 13A to be integrated. Interposition member 13A
Is formed in the shape of a truncated cone whose thickness is gradually increased downward, a gap W is formed on the side surface from the upper end to the lower end, and the cross section is C-shaped.

The core member 12A includes a cylindrical main body 21A which enters the inside of the interposition member 13A, and a gap W between the interposition member 13A.
And a protruding portion 22A protruding from the side surface thereof. The protrusion 22A extends from the upper end to the lower end of the main body 21A with the same width, and the gap W
Is to be filled. The core member 12A protrudes from a fixing member 41 that is fixed to a later-described base forming form in which concrete is cast.

Next, a procedure for forming and using the molding jig 10A and a procedure for fixing the building unit 100 to the foundation 102 will be described. First, the partition member 11A is provided on the surface.
The core member 12A is provided inside the intervening member 13A
Insert At this time, the protrusion 22A of the core member 12A is stored in the gap W of the interposition member 13A. Core member 12
When the convex portion 22A of A is stored, the partition member 1 of that portion is stored.
1A is attached to the interposition member 13A to cover the gap.

As shown in FIG. 4, the forming jig 10A formed as described above is fixed via a nut 40A to a fixing member 41 spanned over a pair of basic forming molds 40. Then, concrete is poured into the inside of the foundation forming formwork 40, and after curing of the concrete, the forming jig 10A is removed from the solidified concrete, and the bottom side is wide and the opening side is narrow as shown in FIG. An anchor planting hole 42 is formed. In order to remove the forming jig 10A, first, the core member 12A is pulled out from the inside of the partition member 11A, a gap W is formed on the side surface of the interposition member 13A, and the opposing surface formed in the gap W is shifted. At this time, the intervening member 13A is pulled upward while eliminating the gap W. By pulling out the interposition member 13A, the partition member 11A integrated with the interposition member 13A is also automatically peeled off from the solidified concrete. The core member 12A, the interposition member 13A, and the partition member 11A are used to form the anchor planting holes 42 in other portions forming the foundation 102.
Use repeatedly.

After forming the anchor planting hole 42, as shown in FIG. 1, a mortar 104 is injected into the inside, and the anchor 101 projecting downward from the lower surface of the building unit 100 is inserted into the anchor planting hole 42. And building unit 1
00 is fixed to the base 102. Thus, the building unit 100 is fixed to the foundation 102.

According to the first embodiment, the following effects can be obtained. In other words, the mortar 104 solidified inside the anchor planting hole 42 having a wide bottom surface and a narrow opening side has a wide bottom surface and a narrow opening side.
Therefore, even if the anchor 101 is to be pulled out, the bottom side of the mortar 104 for fixing the anchor 101 is hooked on the inner surface of the foundation 102. Thereby, anchor 1
In the case of No. 01, the withstand strength against an external force applied in the direction in which the anchor 101 is pulled upward increases, and the pull-out strength of the anchor 101 can be improved.

The side of the mortar 104 is
Is directly in contact with the concrete, and the forming jig 10A is removed after forming the anchor planting holes 42. Therefore, unlike the case of using a conventional iron sheath tube, there is no problem such as rust, and Appearance can be improved.

Further, since the interposition member 13A is formed of a soft elastic body which can be easily deformed, the core member 12A
Can be easily removed, and if the core member 12A is removed, the intervening member 13A and the cylindrical partition member 11A obtained by rolling the soft surface material can be easily removed. Thereby, the member forming the forming jig 10A can be removed after the foundation 102 is cured, and can be used many times.
The cost required for fixing the building unit 100 to the foundation 102 is reduced, and there is no problem such as rust.
02 can be improved.

The partition member 11A and the interposition member 1
3A can be made of a synthetic resin, which reduces the number of metal parts and reduces the weight as a whole, so that handling and transportation can be facilitated, and the work efficiency of placing the foundation 102 can be improved. Can be improved.

Further, since the shape of the forming jig 10A is gradually increased downward, the shape of the forming jig 10A is reduced.
By using A, the anchor planting hole 42 having a wide bottom surface and a narrow opening side can be formed. For this reason, the anchor 101 is inserted into the anchor planting hole 42 and the mortar 1
When the anchor 101 is cast at 04 or the like, the strength of the anchor 101 against an external force applied in a direction of being pulled upward is increased, and the pull-out strength of the anchor 101 can be improved.

Further, in order to form the shape of the forming jig 10A so as to be gradually thicker downward, an intervening member 13A whose thickness is gradually increased downward is used. Since the thickness is gradually reduced toward the bottom, it is not necessary to form other members to be gradually increased downward, and the forming jig 10A which is gradually increased toward the bottom can be easily formed.

Further, since the anchor planting hole 42 formed by the forming jig 10A is formed in a truncated cone shape, for example, the anchor 101 provided on the lower surface of the building unit 100 is obliquely bent. Also, anchor planting hole 4
2 hardly hits the inner surface of the anchor 101
Can be improved.

Also, by attaching the partition member 11A formed of a vinyl chloride sheet to the interposed member 13A made of foamed polyethylene, concrete is put into the inside of the foundation forming frame 40 to form the anchor planting hole 42. At this time, irregularities are formed on the surface of the partition member 11A by the aggregate contained in the concrete. As a result, irregularities are also formed on the inner surface of the formed anchor planting hole 42, so that the mortar 104 is caught by the irregularities only by putting the mortar 104 therein and solidifying it.
04 can improve the adhesion strength to the base 102,
From this point as well, the pull-out resistance of the anchor 101 can be improved.

FIG. 5 shows a molding jig 10B to which the second embodiment of the present invention is applied. In the second embodiment,
In the first embodiment, the forming jig 10A having a truncated cone shape with the interposition member 13B having a gradually increasing thickness in the downward direction in the first embodiment is formed into a truncated cone shape in which the diameter of the lower surface is larger than the upper surface. This is a forming jig 10B in which the whole child member 12B has a truncated cone shape.

That is, the interposition member 13B in which the partition member 11B is integrated is formed by rounding a surface material having a uniform thickness, and a gap W is formed on the side surface from the upper end to the lower end. The cross section is C-shaped.
The core member 12B is placed inside the interposition member 13B,
The main body 21B is formed in a truncated cone shape having a lower surface diameter larger than the upper surface, and a convex portion 22B protruding from the side surface thereof so as to correspond to the gap W of the interposition member 13B. The protruding portion 22B extends from the upper end to the lower end of the main body 21B with the same width, and fills the gap W of the interposition member 13B. The core member 12B protrudes from a fixing member 41 that is fixed to a foundation molding form in which concrete (not shown) is cast. Thus, the molding jig 10
B has a truncated cone shape that gradually becomes thicker downward by using a core member 12B formed in a truncated cone shape having a lower surface diameter larger than the upper surface.

According to the second embodiment, the molding jig 10B uses the core member 12B formed in the shape of a truncated cone having a larger diameter on the lower surface than on the upper surface. Since the frustoconical shape is used, the same operation and effect as those of the first embodiment can be obtained.

FIG. 6 shows a molding jig 10C to which the third embodiment of the present invention is applied. In the third embodiment,
The forming jig 10A in the first embodiment, which has a truncated cone shape with the interposition member 13A having a gradually increasing wall thickness in the first embodiment, has a convex portion 22C having a width increasing downward. This is a molding jig 10C in which the core member 12C has a truncated cone shape as a whole.

That is, the interposition member 13C integrated with the partition member 11C is formed by rolling a rectangular face material having a uniform thickness dimension into a cylindrical shape, and has a side surface extending from the upper end to the lower end. A gap W is formed and the cross section has a C-shape. The core member 12C is provided with an intervention member 13C.
The main body 21C is formed into a columnar shape and enters into the inside of the inside, and a convex portion 22C protruding from the side surface thereof is provided so as to correspond to the gap W of the interposition member 13C. The protruding portion 22C extends from the upper end to the lower end of the main body 21C, and has a width dimension increasing downward. In other words, the protrusion 22C
The width dimension W2 at the lower end is larger than the width dimension W1 at the upper end (W1 <W2). Core member 12C
Are projectingly provided on a fixing member 41 fixed to a foundation molding form in which concrete (not shown) is poured.

Next, the procedure for forming the molding jig 10C will be described. First, a cylindrical interposed member 13C having a gap W formed by a rectangular face material is formed. Convex part 22C of core member 12C
Is gradually increased downward with respect to the width dimension of the gap W of the interposition member 13C, so that the gap W of the interposition member 13C is slightly widened by hand to interpose the projection 22C. The main body 21C is inserted into the interposition member 13C while matching the gap W of the member 13C. Here, the intervening member 13C
As shown by the two-dot chain line in FIG. 6, the gap W of the interposition member 13C is expanded by the convex portion 22C whose width dimension increases downward, so that the interposition member 13C The whole gradually grows downward.
As a result, the interposing member 13C is formed in a truncated conical shape in which the diameter of the lower surface is larger than that of the upper surface, and as shown in FIG.
C is formed.

According to the third embodiment, the same operation and effect as those of the first and second embodiments can be obtained.

FIG. 8 shows a molding jig 10D to which the fourth embodiment of the present invention is applied. In the fourth embodiment,
When the molding jig 10A in the first embodiment, which is formed in a truncated cone shape by the interposing member 13D whose thickness is gradually increased downward, is expanded, the lower side is longer than the upper side, that is, a so-called fan shape. Are formed into a forming jig 10D having a truncated cone shape as a whole by a partition member 11D and an interposition member 13D formed by rolling the above members into a truncated cone shape.

That is, the interposing member 13D has a so-called fan-shaped surface having a uniform thickness and a length L1 of the lower side longer than a length L2 of the upper side (L1> L2). The material is rounded and formed into a truncated cone,
A gap W is formed on the side surface from the upper end to the lower end, and the cross section is C-shaped. The partition member 11D is integrated with the interposition member 13D, and like the interposition member 13D,
A core member 12D in which a lower side is longer than an upper side, that is, a so-called fan-shaped face material is formed into a truncated cone shape by being rounded, is a circle that is placed inside the interposition member 13D. A column-shaped main body 21D and a convex portion 22D protruding from the side surface thereof so as to correspond to the gap W between the interposition members 13D.
And The protrusion 22D extends from the upper end to the lower end of the main body 21D with the same width, and fills the gap W between the interposition members 13D. The core member 12D protrudes from a fixing member 41 that is fixed to a foundation forming form in which concrete (not shown) is poured.

Next, the procedure for forming the molding jig 10D will be described. First, a truncated conical interposition member 13D having a gap W formed by a fan-shaped face material is formed. The core member 12D is put inside the interposition member 13D. At this time, the core member 12D
The protrusion 22D is inserted while being matched with the gap W of the interposition member 13D. Thereby, since the partition member 11D and the interposition member 13D are formed in a truncated cone shape, a truncated cone-shaped forming jig 10D that becomes gradually thicker downward as shown in FIG. 9 is formed.

According to the fourth embodiment, when the molding jig 10D is expanded, the lower side is longer than the upper side. By using the 11D and the interposition member 13D, the shape becomes a truncated conical shape that gradually becomes thicker downward, so that the same operation and effect as those of the first to third embodiments are obtained.
The effect is obtained.

It should be noted that the present invention is not limited to the above-described embodiment, but includes other configurations capable of achieving the object of the present invention, and the following modifications are also included in the present invention.
For example, the materials of the partition member, the core member, and the interposition member that form the molding jig are not limited to those shown in the above embodiment, and other synthetic resins and synthetic resin elastomers can be used. The material may be appropriately selected for implementation.

In the above embodiment, the forming jig is formed in a truncated cone shape. However, the present invention is not limited to this. For example, the forming jig may be formed in a truncated pyramid shape. In short, the forming jig only needs to be gradually thicker downward, and its shape and configuration may be appropriately selected in implementation.

Further, in the above embodiment, the side of the mortar 104 filled in the anchor planting hole 42 is
However, the present invention is not limited to this, and a frustum-shaped anchor planting hole forming jig may be provided between the mortar 104 and the concrete.

[0041]

As described above, according to the anchor member fixing structure of the first invention, there is an effect that the pull-out resistance of the anchor member can be improved. Further, according to the anchor planting hole forming jig of the second invention, it is possible to repeatedly use the members for the foundation, to eliminate waste of expensive foundation parts, and to improve the appearance of the foundation. There is.

[Brief description of the drawings]

FIG. 1 is a sectional view showing fixing of a building unit and a foundation in the embodiment.

FIG. 2 is a perspective view showing a molding jig according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a molding jig in the embodiment.

FIG. 4 is a perspective view showing a state of installation on a mold in the embodiment.

FIG. 5 is an exploded perspective view showing a molding jig according to a second embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a molding jig according to a third embodiment of the present invention.

FIG. 7 is a front view showing a molding jig in the embodiment.

FIG. 8 is an exploded perspective view showing a molding jig according to a fourth embodiment of the present invention.

FIG. 9 is a front view showing a molding jig in the embodiment.

FIG. 10 is an exploded perspective view showing a conventional example.

FIG. 11 is a sectional view of the conventional example.

FIG. 12 is a front view showing a molding jig according to the conventional example.

[Explanation of symbols]

 Reference Signs List 10A to 10D Molding jig 11A to 11D Partition member 12A to 12D Core member 13A to 13D Interposition member 21A to 21D Main body 22A to 22D Convex part 40 Foundation molding form 42 Anchor planting hole 100 Building unit 101 Anchor 102 Foundation

Continuation of the front page (72) Inventor Eichu Kawakami 2-4-5 Takaido Higashi, Suginami-ku, Tokyo Misawa Home Co., Ltd. F term (reference) 2D046 AA01

Claims (7)

[Claims] An anchor member fixing structure for inserting an anchor member projecting downward from a lower surface of a box-shaped building unit into an anchor planting hole formed on a foundation and fixing the anchor member with mortar, The anchor member fixing structure, wherein the anchor planting hole has a wide bottom surface side and a narrow opening side. 2. The fixing structure for an anchor member according to claim 1, wherein the foundation is made of concrete, and a side surface of the mortar filled in the anchor planting hole is in direct contact with concrete of the foundation. A fixing structure for an anchor member, comprising: 3. When fixing a box-shaped building unit to a foundation, concrete is formed on the foundation by forming an anchor planting hole into which an anchor member projecting downward from a lower surface of the building unit is inserted. An anchor planting hole forming jig that is installed in a foundation forming mold that is cast therein, and a cylindrical partition member obtained by rolling a soft surface material, and a jig accommodated inside the partition member. An anchor planting comprising: a core member that is provided, and an interposition member made of a soft elastic body interposed between the partition member and the core member, and is gradually thicker downward. Hole forming jig. 4. The anchor planting hole forming jig according to claim 3, wherein the thickness of the interposing member is gradually increased downward. Utensils. 5. The anchor implantation hole forming jig according to claim 3, wherein said core member is formed in a truncated cone shape having a larger diameter at the lower surface than at the upper surface. Hole forming jig. 6. A jig for forming an anchor planting hole according to claim 3, wherein said core member is formed in a columnar shape and provided with a convex portion projecting from a side surface thereof. The projecting portion extends from the upper end to the lower end of the core member, and has a width dimension increasing downward. 7. The anchor planting hole forming jig according to claim 3, wherein the partition member and the interposition member have a lower side longer than an upper side when deployed, and are rounded into a truncated cone. An anchor planting hole forming jig characterized in that it can be used.