JP2020158995A - Foundation structure of columnar object, cover member, and foundation structure production kit - Google Patents

Abstract

To provide a foundation structure of a columnar object which can fix the columnar object stably, and which can exhibit high weather resistance.SOLUTION: A foundation structure of a columnar object includes: a columnar object; a resin cured material filled in a foundation hole formed on the ground surface; and a cover member provided on the resin cured material and having a through-hole. One end of the columnar object is buried in the resin cured material through the through-hole of the cover member.SELECTED DRAWING: Figure 1

Description

The present invention relates to a columnar basic structure, a cover member, and a columnar basic structure manufacturing kit.

Conventionally, in order to erect a columnar object such as a column on the ground, a bunch of stones is installed on the ground, a bunch is inserted into a foundation hole of the bunch of stones, and mortar is filled between the foundation hole and the column. .. However, the foundation structure using mortar has problems in terms of workability and construction period. Therefore, in order to simplify and shorten the construction period, a method of fixing the support column to the foundation hole using a curable resin such as urethane resin is known.

For example, Patent Document 1 discloses a basic structure in which a support column is supported by a urethane resin. Further, Patent Document 2 discloses the basis of a columnar structure made of a foamed synthetic resin molded product.

Japanese Unexamined Patent Publication No. 2017-160658 Japanese Unexamined Patent Publication No. 11-1248665

However, in the basic structure made of a curable resin, when the curable resin is cured, it may be cured in a shape in which the periphery of the column is depressed due to insufficient filling of the curable resin. In this case, the columns tend to wobble, and it is not possible to maintain sufficient strength when the columns are fanned by strong winds or the like. Further, since a curable resin such as urethane resin has low weather resistance, it is easily deteriorated by being exposed to wind, rain or ultraviolet rays for a long period of time.

Therefore, an object of the present invention is to provide a basic structure of a columnar object capable of stably fixing the columnar object and exhibiting high weather resistance.

As a result of diligent studies, the present inventors have found that the following invention can solve the above problems. That is, the present invention is as follows.

[1] The cover member has a columnar object, a cured resin product filled in a foundation hole formed on the ground, and a cover member provided on the cured resin product and having a through hole. The basic structure of a columnar object in which one end of the columnar object is embedded in the cured resin product through the holes.
[2] The basic structure of the columnar body according to [1], wherein the cured resin product is a foam.
[3] The basic structure of a columnar object according to [1] or [2], which is embedded in the cured resin product with one end of the columnar object adhered to the cured resin product.
[4] The columnar basic structure according to any one of [1] to [3], wherein the horizontally projected area of the cover member is equal to or larger than the horizontally projected area of the opening of the foundation hole.
[5] The basic structure of a columnar object according to any one of [1] to [3], wherein the horizontally projected area of the cover member is equal to or less than the horizontally projected area of the opening of the foundation hole.
[6] The basic structure of a columnar object according to any one of [1] to [5], which has a fixing portion on the ground plane of the cover member.
[7] The columnar basic structure according to any one of [1] to [6], which has a waterproof layer between the side surface of the foundation hole and the cured resin product.
[8] The basic structure of a columnar object according to [7], which has a waterproof layer between the side surface and bottom surface of the foundation hole and the cured resin product.
[9] A cover member having a columnar object through hole through which one end of a columnar object to be embedded in a cured resin material filled in a foundation hole can be inserted.
[10] The cover member according to [9], further having a second through hole.
[11] The cover member according to [9] or [10], which has a top surface portion and an extending portion extending downward from the top surface portion, and has the columnar object through hole in the top surface portion.
[12] The cover member according to any one of [9] to [11], wherein the extending portion is provided at a position outside the inner circumference of the foundation hole.
[13] The cover member according to any one of [9] to [11], which is provided at a position where the extending portion is inscribed in the foundation hole.
[14] A columnar basic structure manufacturing kit containing a curable resin and the cover member according to any one of [9] to [13].

According to the present invention, it is possible to provide a basic structure of a columnar object capable of stably fixing the columnar object and exhibiting high weather resistance.

It is sectional drawing which shows the basic structure of the columnar thing which concerns on one Embodiment of this invention. It is a perspective view which shows the cover member which concerns on one Embodiment of this invention. It is a top view which shows the cover member which concerns on one Embodiment of this invention. It is sectional drawing which shows the cover member which concerns on one Embodiment of this invention. It is a perspective view which shows the cover member which concerns on one Embodiment of this invention. It is a perspective view which shows the cover member which concerns on one Embodiment of this invention. It is a perspective view which shows the cover member which concerns on one Embodiment of this invention. It is a perspective view which shows the cover member which concerns on one Embodiment of this invention. It is a perspective view which shows the cover member which concerns on one Embodiment of this invention. It is sectional drawing which shows an example of the use mode of the cover member of FIG. It is a perspective view which shows the cover member which concerns on one Embodiment of this invention. It is a perspective view which shows the cover member which concerns on one Embodiment of this invention. It is explanatory drawing explaining a part of the method of constructing the basic structure of a columnar object which concerns on one Embodiment of this invention. It is explanatory drawing explaining a part of the method of constructing the basic structure of a columnar object which concerns on one Embodiment of this invention. It is explanatory drawing explaining a part of the method of constructing the basic structure of a columnar object which concerns on one Embodiment of this invention. It is sectional drawing which shows the usage mode of the cover member which concerns on one Embodiment of this invention. It is sectional drawing which shows the usage mode of the cover member which concerns on one Embodiment of this invention.

[1. Columnar basic structure and cover member]
(Basic structure of columnar object)
As shown in FIG. 1, the basic structure 10 of the columnar object according to the embodiment of the present invention includes the columnar object 12, the cured resin product 16 filled in the foundation hole 14 formed in the ground 13, and the cured resin product. A cover member 18 provided on the 16 and having a through hole (columnar object through hole) H1 is provided, and one end of the columnar object 12 is embedded in the resin cured product 16 through the through hole H1 of the cover member 18. There is. It is preferable that the cover member 18 is provided with a second through hole H2 in addition to the through hole H1.

By providing the cover member 18 on the curable resin that forms the cured resin product 16, depressions are less likely to be formed around the columnar material 12 after the curable resin is cured. More specifically, the curable resin 15 is injected and molded so as to be in contact with or pressed against the cover member 18, so that depressions are less likely to be formed around the columnar object 12 after curing. As a result, the foundation structure 10 can secure sufficient strength, and the columnar object 12 can be stably fixed. Further, when the cover member 18 covers the cured resin product 16, deterioration of the curable resin 16 due to wind and rain or ultraviolet rays can be suppressed, and high weather resistance can be exhibited.

Here, the columnar objects 12 include, for example, traffic signals, display board and advertising board columns, approach light columns, various fence columns such as wire mesh fences, guardrail columns, post box columns, telephone booth columns, and the like. Can be mentioned. Further, one end of the columnar object 12 means a portion of the columnar object 12 fixed by the basic structure 10.

The width (maximum diameter) of the opening of the foundation hole 14 can be appropriately set by the columnar object 12 to be fixed, and is, for example, about 100 to 600 mm.
Further, it is preferable that the shape of the opening of the base hole 14 and the shape of the cover member 18 in the plan view are the same or similar to each other. Then, depending on the size (maximum diameter) of the opening of the foundation hole 14, the horizontally projected area of the cover member 18 may be made larger than or larger than the horizontally projected area of the opening of the foundation hole 14, or the foundation hole may be increased. It is preferable that the area is equal to or less than or smaller than the horizontal projected area of the opening of 14.

By setting the horizontally projected area of the cover member 18 to be equal to or larger than the horizontally projected area of the opening of the foundation hole 14, the entire foundation hole 14 can be covered, and the foundation hole 14 can be easily closed. It is more preferable that the horizontally projected area of the cover member 18 is larger than the horizontally projected area of the opening of the base hole 14.

Further, by setting the horizontally projected area of the cover member 18 to be equal to or less than the horizontal projected area of the opening of the foundation hole 14, the cover member 18 can be arranged in the foundation hole 14, for example, the cover member 18 after the arrangement. The cover member 18 can be hidden by covering the cover member 18 with soil or the like. It is more preferable that the horizontally projected area of the cover member 18 is smaller than the horizontally projected area of the opening of the base hole 14.
Here, the horizontal projected area means the area of the projected surface when viewed in a plan view (when viewed from directly above) when the cover member is installed in the base hole, and there is a through hole in the projected surface. Also refers to the area including this.

Examples of the cured resin product 16 include cured products of curable resins such as epoxy resins and urethane resins. By using a curable resin, it is possible to reduce the weight during construction and facilitate the work. In addition, the curing time can be shortened as compared with the curing using the conventional mortar.
The cured resin product 16 is preferably a foam, more preferably a urethane foam. The foaming pressure when the foam is formed improves the adhesion between the basic structure and the soil on the outside, and can reduce the amount of resin used.

From the viewpoint of preventing deterioration of the cured resin product due to the intrusion of moisture in the ground and moisture from the outside and further improving weather resistance, it is preferable to have a waterproof layer between the side surface of the foundation hole and the curable resin. It is more preferable to have a waterproof layer between the side surface and the bottom surface of the foundation hole and the curable resin. As the waterproof layer, a known waterproofing agent or the like is sprayed on at least a part of the side surface and the bottom surface of the foundation hole in advance to form a waterproof layer, or a waterproof film (for example, a plastic film or the like) is arranged to form a waterproof layer. , Can be formed. Further, a waterproof layer can be formed by using a cover member as described later.

(Cover member)
As shown in FIG. 2, the cover member 18 according to the embodiment of the present invention penetrates a columnar object through which one end of a columnar object 12 to be embedded in the cured resin material 16 filled in the base hole 14 shown in FIG. 1 can be inserted. It has a hole H1. Further, it is preferable to have a second through hole H2 together with the columnar through hole H1. The columnar object through hole H1 is a through hole through which one end of the columnar object 12 is inserted.

The shape of the hole of the columnar object through hole H1 is preferably the same as or similar to the cross-sectional shape of one end of the columnar object 12 to be inserted, and the size is preferably large enough to allow one end of the columnar object 12 to be inserted. The maximum diameter of the columnar through hole H1 is about 50 to 200 mm. Further, if the size of the hole is too large, rainwater or the like may easily enter between the hole and the columnar object. In consideration of this point, it is preferable that the gap between the columnar object 12 and the columnar object through hole H1 to be inserted is small.
Further, considering the role of the overflow hole at the time of injecting the curable resin and the opening portion of the expanded resin, the maximum diameter of the columnar object through hole H1 may be about 1 to 20 mm larger than the maximum diameter of the columnar object. preferable.

When the second through hole H2 is provided, the second through hole H2 can be used for injecting the curable resin, or can be used as an opening portion of the expanded resin after injecting the curable resin. .. The shape of the hole of the second through hole H2 is not particularly limited, but for example, the shape is preferably a shape in consideration of the shape of the injection hole of the spray gun used for injecting the curable resin, and the maximum diameter of the second through hole H2. Is about 5 to 100 mm. The second through hole H2 is preferably configured so that a lid can be formed after the curable resin is cured. As a result, it is possible to prevent rainwater and the like from entering after construction.

The plan view of the cover member 18 shown in FIG. 2 is circular as shown in FIG. 3 (A), but the shape of the cover member is not limited to this, and is similar to the cover member 28 shown in FIG. 3 (B). It is selected in consideration of the shape of the opening of the base hole, such as a rectangle and an ellipse such as the cover member 38 shown in FIG. 3C. In any case, the positions of the columnar through hole H1 and the second through hole H2 are not particularly limited, but the columnar through hole H1 is located at the center of the cover member from the viewpoint of stably fixing the columnar object 12. Is preferable. Further, it is preferable to set the position and number of the second through holes H2 in consideration of the role as an injection hole for the curable resin, the role for overflow of the curable resin that overflows due to curing, and the like.

Further, the shape may be such that the columnar through hole H1 and the second through hole H2 are partially connected. Further, from the viewpoint of being easy to attach to the columnar object 12 and improving workability, the structure may have a notch in the outer peripheral portion from the columnar object through hole H1.
Further, the cover member 18 may be divided into a plurality of parts so that they can be combined when attached to the columnar object 12. Further, the cover member 18 may be configured to further have a fixing means for fixing the columnar object 12.

Further, the shape of the cover member on the ground contact surface side can be various shapes as long as the effect of the present invention is exhibited, and is not particularly limited. For example, the cover member has a top surface portion and an extending portion extending downward from the top surface portion, and has a columnar through hole in the top surface portion, or the extending portion is outside the inner circumference of the foundation hole. The configuration may be such that the extension portion is provided at a position inscribed in the base hole, or the extension portion is provided at a position inscribed in the foundation hole. Examples of such a configuration include a cover member having a lid shape, and a substantially tubular shape having a side wall formed of an extending portion and the side wall having a tubular shape or a substantially tubular shape. The lid shape is preferable from the viewpoint of compactness. The substantially tubular shape is preferable from the viewpoint of strengthening the temporary fixing of the columnar object and preventing the cover member from floating or shifting due to the overflow of the curable resin.
Here, the "substantially tubular shape" includes a cylindrical shape and a square tubular shape, a cylindrical shape such as a cylindrical shape and a square tubular shape, and a tubular shape having a slit in the axial direction.

In any shape of the cover member, by providing the extending portion, the function of the fixing portion fixed to the ground plane can be exhibited. That is, the cover member has a fixing portion on the ground plane, and the cover member can be easily and stably fixed to the foundation hole 14.

For example, when the cover member has a lid shape, the shape shown in FIG. 4 can be mentioned.
The cover member 18 shown in FIG. 4A is provided with an annular portion 18D extending downward from the upper surface thereof, that is, the outer periphery of the top surface portion 18C. In the cover member 48 shown in FIG. 4B, a plurality of extending portions 18D are provided downward from the outer periphery of the top surface portion 18C. The tips of the plurality of extending portions 18D may be flat as shown in FIG. 4 (B), but may have a sharp shape from the viewpoint of ease of fixing to the ground plane.
As shown in FIG. 1, the extension portion 18D in FIGS. 4A and 4B can fix the cover member by inserting it into the ground 13.
In the cover member 58 shown in FIG. 4C, an extension portion 18D is provided in an annular shape from the inside to the bottom of the outer circumference of the top surface portion 18C. By making the outer diameter of the extension portion 18D substantially the same as the inner diameter of the foundation hole 14, the extension portion 18D can be fitted into the foundation hole and fixed.
In the above example, the length of the extending portion (length in the extending direction) in the case of the lid shape is preferably 5 mm or more, and more preferably 10 mm or more. Further, it is preferably 400 mm or less, and more preferably 200 mm or less.

Further, for example, when the cover member has a substantially tubular shape, the shapes as shown in FIGS. 5 to 9 can be mentioned.
The cover member 68 shown in FIG. 5 has a top surface portion 18C and an extending portion 18D extending downward from the top surface portion 18C, and the top surface portion 18C has a columnar through hole H1 and a second through hole H2. Although the lower part of the cover member 68 is open, it may be connected to a bottom surface portion having a through hole concentric with the columnar through hole H1. In addition, a part of the extending portion may have a protruding portion protruding toward the ground. The fixing property of the cover member becomes higher when the protruding portion sticks into the soil.

The cover member 78 shown in FIG. 6 has a structure in which the cover member 68 shown in FIG. 5 is provided with a through hole H3 on the side wall formed of the extending portion 18D. When the curable resin penetrates into the external soil through the through hole H3, the adhesive force between the basic structure and the outer soil is improved, and a more stable basic structure can be realized. The maximum diameter of the through hole H3 is not particularly limited, but is preferably about 5 to 100 mm. Although the lower part of the cover member 78 is open, it may be connected to a bottom surface portion having a through hole concentric with the columnar through hole H1. Further, a part of the extending portion may have a protruding portion protruding toward the ground. The fixing property of the cover member becomes higher when the protruding portion sticks into the soil.

In the cover member 88 shown in FIG. 7, three extending portions 18D are provided at predetermined intervals, and are connected to a bottom surface portion 19 having a through hole H4 concentric with the columnar through hole H1. In this shape, the extending portions 18D are provided at predetermined intervals, and the curable resin infiltrates into the outer soil from this interval, so that the adhesive force between the basic structure and the outer soil is improved. The predetermined interval in which the extending portion 18D is provided is not particularly limited, but is preferably about 20 to 200 mm.
The number of extension portions 18D is not limited to three, and may be two or four or more. Further, the extension portion 18D is connected to the bottom surface portion 19, which has a role of preventing the lower end of the extension portion 18D from bending during construction. Therefore, if the lower end of the extending portion 18D does not bend, the bottom portion 19 is not always necessary.

The cover member 98 shown in FIG. 8 is the cover member 88 shown in FIG. 7, and has a tip portion 18F extending further in the underground direction from the bottom surface portion 19 of the extending portion 18D. By biting the tip portion 18F into the ground, more stable fixing becomes possible.
It should be noted that the bottom surface portion 19 is not always necessary, as in the case of the cover member 18 shown in FIG. 7.

In the case of a cover member having a substantially tubular shape as shown in FIGS. 5 to 8 above, the length of the extending portion having a substantially tubular shape (length in the extending direction) is preferably 50 mm or more. It is more preferably 100 mm or more. Further, it is preferably 600 mm or less, and more preferably 400 mm or less.

The cover members shown in FIGS. 5 to 8 are mainly used by fitting the extending portion into the foundation hole, but using a cover member that covers the foundation hole and has a columnar through hole above the ground. May be good.
For example, the cover member 108 shown in FIG. 9 has a shape in which the extending portion 18D is formed downward while expanding the diameter from the outer periphery of the top surface portion 18C. In the example shown in FIG. 9, the extending portion 18D extends to the outer flange portion 18F of the opening edge.
As shown in FIG. 10, the cover member 108 covers the foundation hole 14 and the columnar through hole H1 and the second through hole H2 are arranged above the ground. Therefore, the columnar through hole H1 and the second through hole H1 and the second through hole H2. Water is less likely to collect in the vicinity of the through hole H2, and durability such as weather resistance can be further improved. The outer flange portion 18F has a function of stabilizing the temporary fixing of the columnar object 12, but it is not particularly necessary if the temporary fixing can be performed without providing the columnar object 12.

Here, the material of the cover member is not particularly limited, and plastic, metal, ceramic, or the like can be used. Of these, plastic is preferable from the viewpoint of cost and durability. The thickness of the cover member such as the extending portion, the top surface portion, the bottom surface portion, and the protruding portion is not particularly limited, but is about 0.5 to 10 mm.

Further, as another configuration, as shown in FIGS. 11 and 12, the extension portion is composed of a waterproof layer such as a film. The cover member 118 shown in FIG. 11 is provided with a film-shaped extending portion 18G in a tubular shape. The cover member 128 shown in FIG. 12 is provided with a film-shaped extending portion 18G in a tubular shape, and the lower end thereof is connected to a bottom surface portion 19 having a through hole H5 concentric with the columnar through hole H1. In either case, the film layer is pressed against the inner wall of the base hole by the curable resin, and the film layer is formed between the cured resin and the inner wall of the base hole. Since the film layer can exhibit the function of a waterproof layer, it is possible to prevent water from entering the cured resin product and improve durability.
As the waterproof layer, a stretch film, a bellows-shaped film, a rubber-like film (for example, EVA, etc.) and the like can be preferably used, but the waterproof layer is stretched by a curable resin, for example, by reducing the thickness of the plastic. The shape may be easy to use. As a result, the waterproof layer is easily pressed against the inner wall of the foundation hole by the curable resin, and the adhesive force between the foundation structure and the outer soil is further improved. In particular, when a foamable curable resin is used, the waterproof layer is stretched by the foaming pressure and is easily pressed by the inner wall of the foundation hole, and the adhesive force between the foundation structure and the outer soil is further improved.
The thickness of the waterproof layer is not particularly limited, but is about 0.01 to 3 mm.

[2. How to build the basic structure of a columnar object]
The method of constructing the foundation structure of the columnar object is a cover member arranging step of arranging the cover member so as to cover the opening of the foundation hole or inscribed in the foundation hole, and a state in which one end of the columnar object is inserted into the cover member. It is preferable to include a columnar object insertion step, a columnar object insertion step of inserting one end of the columnar object into the foundation hole, and a curable resin filling step of filling the foundation hole with a curable resin.

As a method for constructing the basic structure of the columnar object using each of the above steps, for example, as shown in FIG. 13, the cover member is arranged so as to cover the opening of the base hole (cover member arrangement step). In FIG. 13, the cover member is arranged so as to cover the opening of the foundation hole, but in some cases, the cover member may be arranged so as to be inscribed in the foundation hole as shown in FIGS. 16 and 17. ..

As shown in FIG. 16, when the cover member 138 is arranged so as to be inscribed in the base hole 14, a step may be formed from the ground to the cover member 138 depending on the arrangement position (position in the depth direction). In that case, it may be smoothed by covering it with soil or the like to the same height as the ground.
Further, when soil or the like is covered, when a foamable curable resin is used, the presence of a weight such as soil on the cover member makes it possible to further prevent the cover member from floating due to foaming and expansion of the curable resin.
Further, as shown in FIG. 17, the lower end of the cover member 148 is inscribed in the base hole 14, and the columnar through hole H1 and the second through hole H2 are arranged above the ground. , Water is less likely to collect in the vicinity of the columnar through hole H1 and the second through hole H2, and durability such as weather resistance can be improved. Further, when a foamable curable resin is used, even if a cured resin product expanded by foaming is formed, since there is sufficient space in the height direction, it is possible to further prevent the cover member from floating or deforming due to expansion. it can.

Next, as shown in FIG. 14, one end of the columnar object is inserted into the base hole (columnar object insertion step) with one end of the columnar object inserted into the cover member (columnar object insertion step). If the columnar object wobbles after insertion, it is preferable to temporarily fix the columnar object by using a jig or burying the columnar object in the bottom of the foundation hole.

Then, as shown in FIG. 15, the base hole is filled with the curable resin 15 (curable resin filling step). The curable resin 15 is preferably filled with a spray gun 20 or the like through an injection hole (second through hole H2) provided in the cover member.

For example, when the cured resin is a urethane resin, a urethane resin stock solution containing a polyol component and a polyisocyanate component as a curable resin is filled in the base hole, and the polyol component and the polyisocyanate component are formed in the base hole. A cured resin product is formed by reacting inside the material. Further, the urethane resin stock solution may contain a foaming agent. By utilizing the foaming pressure at the time of foaming, the above-mentioned effect, that is, the effect of improving the adhesion between the basic structure and the outer soil by the foaming pressure can be obtained.

As the urethane resin stock solution, it is preferable to use a urethane resin stock solution in which the reaction and foaming proceed even at room temperature (25 ° C.). By using such a urethane resin stock solution, a foam (polyurethane foam) can be formed by injecting the urethane resin stock solution and then leaving it at around room temperature without heating using a heating means or the like.

After injecting the curable resin 15, it is preferable to close the injection hole (second through hole H2). By closing the injection hole, it is possible to prevent rainwater from entering after construction. The injection hole can be closed by a closing member that can be fitted into the injection hole, such as a resin cap or a screw.

After filling the curable resin 15, the curable resin 15 is cured, and the curable resin 15 and one end of the inserted columnar object 12 are adhered to each other, and one end of the columnar object 12 is adhered to the cured resin object 16. In this state, it is embedded in the cured resin product. Further, the cured resin product 16 and the foundation hole 14 are fixed to each other.

By going through the above steps, the columnar object can be stably fixed, and the basic structure of the columnar object (FIG. 1) capable of exhibiting high weather resistance is constructed.
The method for constructing the basic structure of the columnar object according to the present invention preferably includes a cover member arranging step, a columnar object inserting step, a columnar object inserting step, and a curable resin filling step in this order, but is not limited to this order. , Can be changed according to the situation at the construction site.

[3. Columnar basic structure fabrication kit]
The columnar basic structure manufacturing kit according to the embodiment of the present invention includes the above-mentioned curable resin and the cover member of the present invention. Each of the foundation structure fabrication kits is portable, and can be brought to the work site where the columnar object is fixed to the foundation hole, and the foundation structure fabrication work can be started immediately. The method of using the basic structure preparation kit is as described in the method of constructing the basic structure of a columnar object.

10 Basic structure of columnar object 12 Columnar object 13 Ground 14 Foundation hole 16 Resin cured product 18 Cover member H1 Columnar object through hole H2 Second through hole

Claims (14)

It has a columnar object, a resin cured product filled in a foundation hole formed in the ground, and a cover member provided on the resin cured product and having a through hole, and through the through hole of the cover member. The basic structure of a columnar object in which one end of the columnar object is embedded in the cured resin product. The basic structure of a columnar object according to claim 1, wherein the cured resin product is a foam. The basic structure of a columnar object according to claim 1 or 2, wherein one end of the columnar object is adhered to the cured resin product and is embedded in the cured resin product. The basic structure of a columnar object according to any one of claims 1 to 3, wherein the horizontal projected area of the cover member is equal to or larger than the horizontal projected area of the opening of the base hole. The basic structure of a columnar object according to any one of claims 1 to 3, wherein the horizontal projected area of the cover member is equal to or less than the horizontal projected area of the opening of the base hole. The basic structure of a columnar object according to any one of claims 1 to 5, which has a fixed portion on the ground plane of the cover member. The basic structure of a columnar object according to any one of claims 1 to 6, which has a waterproof layer between the side surface of the foundation hole and the cured resin product. The basic structure of a columnar object according to claim 7, wherein a waterproof layer is provided between the side surfaces and bottom surfaces of the foundation hole and the cured resin product. A cover member having a columnar object through hole through which one end of a columnar object to be embedded in a cured resin material filled in a foundation hole can be inserted. The cover member according to claim 9, further comprising a second through hole. The cover member according to claim 9 or 10, further comprising a top surface portion and an extending portion extending downward from the top surface portion, and having the columnar object through hole in the top surface portion. The cover member according to any one of claims 9 to 11, wherein the extending portion is provided at a position outside the inner circumference of the foundation hole. The cover member according to any one of claims 9 to 11, wherein the extending portion is provided at a position inscribed in the foundation hole. A kit for producing a basic structure of a columnar object, which comprises a curable resin and the cover member according to any one of claims 9 to 13.