JPH11124865A - Foundation of columnar structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the foundation of a columnar structure, by which trouble such as the lengthening of the term of works by the transport of a heavy article, the usage of a heavy machine, curing, etc., is solved by employing a foamed synthetic-resin molded form in place of concrete and which has the same strength and durability as a foundation made of concrete. SOLUTION: In the foundation 1 consisting of a foamed synthetic-resin molded form, an anchor bolt 3 having a plurality of base shafts 4 on the inside is buried and support plates 6 are fixed among each base shaft 4. A reinforcing plate is joined with an underside in a substrate, in which the columnar structure is fastened onto a top face, and both substrate and reinforcing plate are connected and fixed by connecting shafts 24 penetrated through the molded form 23. A hole 28 for inserting the lower section of the columnar structure is bored to the top face in specified depth, the foundation 1 is divided and molded by a perpendicular passed through the hole 28, and sections among each molded form are coupled and fastened by the approximately horizontally penetrated connecting shafts 24. The periphery of the structure inserted into the hole 28 is supported by a support member composed of an upper support piece, a lower support piece and a connecting piece connecting both support pieces. Irregularities are formed along the vertical direction and peripheral direction of an outer circumferential surface. Stability shafts penetrated through the molded forms approximately horizontally and projected to the outside are installed, and a heavy article is buried into the hole 28 bored in specified depth from the top face, thus improving the strength and durability of the foundation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pole or pole light, a bollard, a telephone pole, a traffic signal, a support for a display board or an advertising board, a support for an approach light, a support for various fences such as a wire mesh fence, a support for a guardrail, and a post box. The present invention relates to the foundation of various pillar-shaped structures such as a pillar of a telephone box or a pillar of a telephone booth.

[0002]

2. Description of the Related Art Currently, poles, pole lights, bollards, telephone poles, traffic signals, display boards and advertising boards, and poles for approler lights, which are currently installed in parks, roads, open spaces, etc.
When pillar structures such as pillars of various fences, pillars of guardrails, pillars of post boxes, and pillars of telephone boxes are installed, concrete or reinforced concrete is used as a foundation for these. In particular,
The foundation part of the structure is hardened with concrete and buried in the ground, or a concrete foundation with an anchor is set in the ground in advance, and poles of columnar structures are connected to anchor bolts set up on it Is adopted.

[0003] In the former method, the lower part of a pole or the like is brought to the site as a form which has been previously hardened with concrete in a factory.
They excavate the ground, place concrete in the holes, and backfill the soil. However, this construction method simplifies on-site construction and shortens the construction period, but usually requires about 4 weeks of curing time in order to secure the specified strength and hardness to concrete with poles etc. Also, it is necessary in a place for curing in a factory or the like. Furthermore, in this case, the weight of the concrete itself is very large, and the transportation problem becomes a major obstacle. For example, when installing a pole light 5 m above the ground, the foundation is usually 0.1 mm.
Concrete of the size of 6m x 0.6m x 1.2m is necessary, but the weight of this concrete is about 1 ton, and when transporting by 10 ton truck, only 10 pieces can be loaded at one time. . In addition, heavy equipment must be used to install such heavy poles on site, and there is a problem that the installation of the heavy equipment has a large effect on local communities due to traffic obstacles, and the installation cost increases. is there.

On the other hand, in the latter method, only poles such as columnar structures are brought to the site, and the foundation is constructed on the site. Therefore, there is no need to transport heavy objects as described above and use heavy equipment for installation. However, casting concrete in place requires a concrete mixer truck, which may also cause traffic obstacles and the like. In addition, it is necessary to prepare a concrete formwork at the site, and after the concrete is poured, a curing period of about four weeks is required to secure a predetermined strength and hardness. Removal work and the like are also required, and the harm and cost increase due to the prolonged construction period cannot be avoided.

[0005]

Accordingly, the present inventors have proposed various problems associated with the installation of columnar structures as described above, such as heavy load transport, installation work using heavy equipment, or cast-in-place of concrete in the conventional method. In light of this point, as a result of extensive research into developing a foundation and installation method that is light in weight, requires a short construction period, is inexpensive, and can be applied to a wide range of columnar structures, it has been replaced with concrete, Further, it has been found that the above object can be achieved by using a material that does not require curing or the like, that is, a molded article of a foamed synthetic resin such as foamed polystyrene.

That is, according to the study of the present inventors, a case where a foamed synthetic resin molded article such as expanded polystyrene is used in place of conventional concrete as a foundation of a columnar structure buried underground in civil engineering work. , Even when used for a long time under a large force, it shows unexpectedly excellent mechanical properties,
And it turned out that a molded object hardly became brittle. Therefore,
By utilizing this property, the idea of using a foamed synthetic resin molded article such as the expanded polystyrene as a basis for the above-mentioned various columnar structures instead of the conventional concrete was obtained. This is to apply a load or other mechanical force required for holding a columnar structure such as a pole to the foamed synthetic resin molded article, and was a novel idea which has never been considered before.

However, foamed synthetic resin molded articles are extremely light in weight as compared with concrete and do not require curing after molding, but are inferior in strength, chemical resistance, oil resistance and the like as compared with concrete. However, there is also a problem due to its light weight. For example, simply embedding anchor foundations such as anchor bolts and poles in a foundation made of a foamed synthetic resin molded body is not necessarily sufficient in terms of the mounting strength between the anchor bolts and poles and the foamed synthetic resin molded body. There are cases. In addition, the foundation made of a foamed synthetic resin molded body is lighter in weight than concrete,
Although it is very advantageous in terms of transportation and construction, it is inferior to concrete in terms of pull-out strength because of its light weight. Light weight is also disadvantageous in terms of rotation of a foundation buried in the ground, inclination of a columnar structure, and lifting when submerged in water. Thus, it was also found that simply using the above-mentioned foamed synthetic resin molded article instead of the conventional concrete has a problem in actual construction.

Therefore, the present invention uses a foamed synthetic resin molded article instead of the conventional concrete, and conveys heavy objects, uses heavy equipment, and prolongs the construction period due to curing and the like in the conventional method using concrete. It is an object of the present invention to provide a foundation for a columnar structure having the same strength and durability as a concrete foundation at the same time as solving the above problems.

[0009]

First, as means for improving the mounting strength of a structure to a foundation made of a foamed synthetic resin molded body, an anchor bolt for fixing a columnar structure inside a foamed synthetic resin molded body is used. In a buried structure, a support plate is fixed between the base shafts of the anchor bolts having a plurality of base shafts. In a structure in which a columnar structure is fixed on an upper surface of a foamed synthetic resin molded body, a substrate is provided on the upper surface of the molded body and a substrate is provided on a lower surface thereof. The reinforcing plate is joined, and the substrate and the reinforcing plate are connected and fixed by a connecting shaft penetrating the molded body. In the case where the lower part of the columnar structure is directly embedded, a hole for inserting the lower part of the columnar structure into the upper surface is provided. Is drilled at a predetermined depth, and is connected and fixed by a connecting shaft horizontally penetrating between each of the divided molded articles of the foamed synthetic resin molded article divided by one or more vertical planes passing through the hole. , And a columnar structure An upper support piece and a lower support piece for vertically supporting the periphery of a structure to be inserted into the hole in a foamed synthetic resin molded article having a hole for inserting a lower part of the object at a predetermined depth, and the upper and lower parts. A support member including a connection piece for connecting the support pieces is provided.

When the support plate is fixed between the base shafts of the anchor bolts embedded in the foamed synthetic resin molded body, the receiving surface of the foamed synthetic resin molded body with respect to the anchor bolts becomes large, and the mounting strength of the columnar structure to the molded body is increased. Is improved.
In addition, when the foundation made of the foamed synthetic resin molded body is sandwiched between the substrate and the reinforcing plate which are joined at the top and bottom thereof and connected by the connection shaft, the mounting strength of the structure is improved. Also, if the lower part of the structure is inserted into the hole made in the base made of the divided foamed synthetic resin molded body and the divided molded bodies are connected and fixed with the connecting shaft, the lower part of the columnar structure will be molded. It is firmly tightened between the bodies, and the mounting strength of the columnar structure to the foundation is improved.
Further, by supporting the periphery of the structure at two locations above and below the support member with the upper and lower support pieces, the mounting strength of the structure to the foamed synthetic resin molded article is improved.

As means for improving the strength of the foundation made of the foamed synthetic resin molded body underground and the pull-out strength, an anchor shaft is projected below a predetermined bottom surface made of the foamed synthetic resin molded body; An anchor plate is mounted on a mounting shaft projecting downward from the bottom surface of the molded body. Specifically, in the case where the above-mentioned support member is provided, an anchor shaft projecting downward from the bottom surface of the foamed synthetic resin molded body is fixed to the support member; An anchor plate is fixed to the mounting shaft, and an anchor plate is attached to the mounting shaft; an anchor shaft may be further provided to project downward from the anchor plate. In the case where an anchor bolt for fixing a columnar structure is embedded inside a foamed synthetic resin molded product, an anchor shaft projecting downward from the bottom surface of the foamed synthetic resin molded product is fixed to the anchor bolt; A mounting shaft projecting downward from the bottom surface of the resin molded body is fixed, and an anchor plate is mounted on the mounting shaft.
Further, an anchor shaft may protrude downward from the anchor plate. Further, an anchor shaft penetrating up and down of the foamed synthetic resin molded article and projecting downward from the bottom surface is attached; and a mounting shaft penetrating up and down of the foamed synthetic resin molded article and projecting downward of the molded article is provided. An anchor plate may be attached to the anchor plate, or an anchor shaft may be provided to project further downward from the anchor plate.

When the anchor shaft projects below the bottom surface of the foamed synthetic resin molded body, when the foundation is buried in the ground, the anchor shaft penetrates deeply into the ground, and the installation strength of the foundation is improved. By attaching the anchor plate to the attachment shaft that projects downward from the bottom of the foamed synthetic resin molded body,
When the foundation is buried in the ground, the anchor plate is buried deeper in the ground than the foundation and earth and sand are buried between the anchor plate and the foundation, so that the installation strength of the foundation is improved. Furthermore, if the anchor shaft projects downward from the anchor plate, the installation strength of the foundation is further improved by both the anchor plate and the anchor shaft. In the case where an anchor shaft or an anchor plate which penetrates vertically through a foundation made of a foamed synthetic resin molded article and protrudes downward from a bottom face is attached, the installation strength of the foundation is improved in the same manner as described above.

As another means for improving the pull-out strength of the base made of the foamed synthetic resin molded article from the ground, irregularities are provided along the vertical direction of the outer peripheral surface of the foamed synthetic resin molded article. By providing irregularities along the vertical direction of the outer peripheral surface of the foundation made of the foamed synthetic resin molded body, when the foundation is buried in the ground, earth and sand penetrate into the irregularities, and the foamed synthetic resin molded body The area of contact with the surrounding earth and sand increases, and the strength of pulling out the foundation from the ground improves.

As means for preventing rotation of the base made of a foamed synthetic resin molded article in the ground, irregularities are provided along the circumferential direction of the outer peripheral surface of the foamed synthetic resin molded article. In this way, by providing the irregularities along the circumferential direction of the outer peripheral surface of the foamed synthetic resin molded body, when the foundation is buried in the ground, earth and sand penetrate into the irregularities, and the foamed synthetic resin molded body and the surroundings The contact area with the earth and sand is increased, and rotation of the foundation in the ground is prevented.

Further, by providing a stable shaft that penetrates the foamed synthetic resin molded article substantially horizontally and protrudes outward, when the foundation is buried in the ground, the pull-out strength of the foundation from the ground is improved. At the same time, rotation of the foundation in the ground is also prevented.

As means for preventing the foundation made of a foamed synthetic resin molded article from rising when it is submerged in water, a foamed synthetic resin molded article is loaded with a heavy object through a hole formed at a predetermined depth from its upper surface. Buried. The weight buried in the foamed synthetic resin molded article increases the weight of the entire base, and prevents lifting when the body is immersed in water.

As means for preventing inclination when the center of gravity of the foamed synthetic resin molded article attached to the base made of the foamed synthetic resin molded article is displaced from the axial center, the molded article is shifted to one side in the width direction of the molded article. To fix the columnar structure. Specifically, an anchor bolt for fixing the columnar structure is buried to one side in the width direction of the foamed synthetic resin molded article; the lower part of the columnar structure is inserted to one side in the width direction of the foamed synthetic resin molded body. Make holes. By fixing the lower part of the structure to anchor bolts that are close to one of the foundations, or by inserting and fixing a columnar structure in a hole provided to one side of the foundation, for example, the upper part is sideways like a street lamp Even in the case of a columnar structure that is curved or bent and whose center of gravity is deviated from the axis, the inclination of the structure is prevented by positioning the axis of the structure near the center of the foundation.

On the basis of the columnar structure as described above,
By providing a protective cover on the top surface of the foamed synthetic resin molded article, even when the foamed synthetic resin molded article is exposed on the ground surface,
Deterioration of the foamed synthetic resin molded article due to sunlight or the like can be prevented, and reinforcement by the protective cover improves the strength of the foundation itself and the mounting strength of the structure to the foundation. As the protective cover, a metal plate such as an iron plate, a metal plate whose surface is protected by galvanizing, or a rubber plate can be used.

Means for improving the chemical resistance, weather resistance, oil resistance, etc. of the surface of the base made of the foamed synthetic resin molded article include:
The surface of the foamed synthetic resin molded body is covered with a protective film. By covering the surface of the foamed synthetic resin molded article with the protective film in this way, the foamed synthetic resin molded article buried underground can be oil,
In addition, corrosion or erosion by contaminants or the like that have permeated the ground is prevented.

The type of the base resin of the foamed synthetic resin molded article in the present invention is not particularly limited, and a wide range of synthetic resins can be used as long as it can form a foam made of independent foaming. it can. Specific examples of the base resin include styrene resins such as polystyrene, olefin resins such as polypropylene and polyethylene, and urethane resins such as polyurethane. Further, an oil-resistant synthetic resin, a heat-resistant synthetic resin, or the like can be used depending on the application. As the styrene resin, besides polystyrene obtained by polymerizing only a styrene monomer, high impact polystyrene obtained by partially mixing a synthetic rubber or a rubber latex can be used.

The foamed synthetic resin molded article may be a foamed synthetic resin alone, but if synthetic fiber, carbon fiber, inorganic fiber, metal fiber, wood chip or the like is included as a reinforcing material, the reinforcing material becomes a molded article. It is more preferable because it is dispersed inside to improve the mechanical properties and the strength of the molded body is improved.

The foundation of the columnar structure according to the present invention as described above includes poles, pole lights, bollards, electric poles, traffic lights, display boards and advertising board supports, approach light supports,
It can be used as a base for a wide range of columnar structures such as pillars of various fences such as wire mesh fences, pillars of guardrails, pillars of post boxes, and pillars of telephone boxes. In addition, the approach light refers to a low light installed on a lawn or the like along a passage in a park or a similar structure.

The method for molding the foam on the basis of the columnar structure of the present invention may be a conventional bead foam molding method or an extrusion molding method. Such a synthetic resin foam has high compressive strength and excellent mechanical properties even when a molded body with a high degree of foaming is used, since all the cells contained therein are closed cells filled with gas. However, when the columnar structure of the present invention is used as a basis, a high compressive strength is required, so that the foaming degree is a medium foaming degree (usually 10 to 20 times), and a molded article having a lower foaming degree depending on the application. Is preferred.

The size of the foundation of the columnar structure according to the present invention comprising the foamed synthetic resin molded article may be substantially the same as that of the concrete foundation of the conventional method, but may be formed slightly larger than that. It is preferable to keep it because the stability increases. Further, in the foundation of the columnar structure according to the present invention, 1
The number of columnar structures attached to one foundation is not limited to one, and a plurality of columnar structures may be attached to the same foundation. For example, two adjacent pillars of the guardrail may be mounted side by side on a single horizontally formed foundation at an interval. In this case, the interval between the two columns, that is, the alignment and level adjustment of the two columns becomes extremely easy.

In the case where a hole is made in the side or bottom of a foundation made of a foamed synthetic resin molded body and the foundation is installed near a tree in a park or the like, the roots of the tree are formed in the hole of the foundation. It can also be expected that the foundation will be extended and the foundation will be firmly stabilized.

The method of installing the foundation of the present invention in the ground is almost the same as that of the conventional concrete foundation. The ground is excavated in accordance with the size of the foundation, and if necessary, a chestnut stone, In general, a method is provided in which a foundation is set up on a stone made of soil or a small amount of mortar, a foundation is placed thereon, and the excavated soil is backfilled. In this case, if anchor bolts for fixing the columnar structure are embedded in the foundation, align the anchor bolts with the mounting bolt holes of the poles of the columnar structure, fix them with nuts, and fix the poles, etc. to the foundation. Install the columnar structure. In the case where the lower part of a pole or the like is directly inserted into the foundation, the lower part of the pole is inserted into a hole provided in advance inside the foamed synthetic resin molded body of the foundation and fixed, and then a hole excavated according to the size of the foundation. After embedding the foundation with the bottom of the pole in
Backfill excavated soil.

Since the main part of the columnar structure according to the present invention as described above is made of a foamed synthetic resin molded article whose main part is extremely light in comparison with conventional concrete, it requires heavy goods transportation and heavy machinery. Installation work, concrete pouring at the site, and the associated danger and traffic obstruction can be eliminated.
There is no problem of prolonging the construction period due to the installation and removal of the concrete formwork, and the installation work of the columnar structure is facilitated, and the construction period and economy can be greatly improved.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basics of the columnar structure of the present invention will be described below in more detail with reference to the embodiments shown in the drawings.

FIG. 1A is a front view of a main part of a columnar structure according to an embodiment of the present invention, showing a state where a pole of the columnar structure is mounted, and FIG. Is a plan view thereof. The base 1 is made of a foamed synthetic resin molded body, for example, a foamed polystyrene molded body, and the bottom of the pole 2 is fitted into an anchor bolt 3 embedded therein, and is fixed with a nut. The foundation 1 is excavated on the ground according to its size, and if necessary, a base made of chestnut stone 8 and gorota stone with soil or a small amount of mortar is provided on the bottom, and the foundation 1 is installed thereon. Then, the excavated soil is backfilled and installed.

The anchor bolt 3 has a plurality of base shafts 4 for fixing four poles 2 as shown in FIG.
The spaces are connected to each other by a reinforcing bar 5, and a metal support plate 6 is fixed between two base shafts 4, which are located diagonally.

The foundation 1 of the columnar structure of the present invention as described above
In this case, the load required to hold the pole 2 of the structure, the right and left swaying due to wind, and other mechanical loads are mainly caused by the foamed synthetic resin mainly forming the foundation 1 through the embedded anchor bolts 3. The structure bears the burden on the molded body. For this reason, if the support plate 6 is fixed between the base shafts 4 and 4 of the anchor bolt 3 as in the illustrated embodiment, not only the anchor bolt 3 is reinforced, but also the synthetic resin molding of the anchor bolt 3 is performed. The receiving surface of the body becomes large, the mounting strength of the pole 2 made of the foamed synthetic resin body is improved, and the load required for holding the pole 2 of the structure, the right and left swaying due to wind, etc., and other mechanical loads Can be reliably received by the foundation 1.

The support plate 6 attached between the base shafts 4 and 4 of the anchor bolt 3 is made of a metal plate such as an iron plate.
As shown in (b), two support plates 6, 6 are fixed between two pairs of opposed base shafts 4, 4 of the anchor bolt 3, and the respective base shafts 4 are connected by a reinforcing bar 5. Good. In addition, by providing the holes 9 in the support plate 6, the integration with the foamed synthetic resin molded body can be further improved. The anchor bolt 3 may be formed by simultaneous molding when molding the foamed synthetic resin molded body.

As the base resin of the foamed synthetic resin molded article constituting the base 1, in addition to the above-mentioned polystyrene, polyethylene, polypropylene, polyurethane and the like can be used. Among them, polystyrene foam is economically advantageous. When the load applied to the foundation 1 such as the weight of the pole is large, or when tear strength is required, a high impact polystyrene foam can be used. In terms of chemical resistance and the like, it is advantageous to use a foam of a polyolefin-based resin such as polyethylene or polypropylene. The degree of foaming of these foamed synthetic resin molded articles can be appropriately set depending on the application,
When high strength is required, a material having a low foaming degree is used.
Further, when it is necessary to improve the strength of the foamed synthetic resin molded product, a foamed product in which a reinforcing material having high tensile strength is uniformly dispersed can be used. As the reinforcing material, synthetic fibers, carbon fibers, inorganic fibers such as rock wool, metal fibers such as steel wool and aluminum wool, and wood chips can be used. Further, a wire net or the like may be embedded in the molded body. In the other examples described below, the same applies to the base resin and the reinforcing material of the foam.

When the bottom surface of the pole 2 that contacts the surface of the foundation 1 is smaller than the top surface of the foundation 1, the load of the pole 2 is uniformly applied to the upper surface of the formed body of the foundation 1.
It is preferable that a metal protective cover 7 such as an iron plate is joined to the upper surface of the cover. The protective cover 7 not only applies the load of the pole 2 uniformly to the foundation 1 as described above, but also when the upper surface of the foundation 1 is exposed to the ground surface, it is made of a foamed synthetic resin molded body by sunlight or the like. To prevent the base 1 from deteriorating from the surface. Furthermore, if zinc plating or the like is applied to the surface of the metal protective cover, the durability is further improved. In addition, as described above, the reinforcing material is uniformly dispersed in the inside of the molded body of the foundation 1, or a wire mesh is embedded,
Further, when the protective cover 7 is joined to the surface of the foundation 1, a method of forming the molded body by simultaneous molding at the time of molding the molded body is as follows.
It is preferable in terms of performance, productivity, manufacturing cost, and the like of the foundation 1.

FIG. 3 is a front view showing another embodiment of the foundation of the columnar structure according to the present invention, in which a bollard which is an example of the columnar structure is attached, and FIG. 4 is an exploded perspective view thereof. is there. The base 11 is made of a foamed synthetic resin molded body, and a substrate 13 made of a metal plate or the like for fixing the bollard 12 is joined to the upper surface thereof, and the substrate 13 is joined to the bottom surface of the molded body constituting the base 11 by reinforcement. A connection shaft (screw shaft) 15 that penetrates the molded body up and down is connected and fixed between the plate 14 and the base of the bollard 12 on the screw shaft 15 protruding above the substrate 13 on the upper surface of the base 1.
The bottom of the base 16 is fitted and fixed with a nut. The screw shaft of the bottom of the pole 17 of the poled 12 is fitted into the upper surface of the base 16 and fixed with the nut.

As described above, the upper and lower sides of the foundation 1 made of a foamed synthetic resin molded body are sandwiched between the substrate 13 and the reinforcing plate 14, and the two are connected by the connecting shaft (screw shaft) 15 penetrating the molded body of the foundation 1. Thereby, the mounting strength of the pole 12 is improved, and at the same time, the formed body of the foundation 1 is reinforced by the upper and lower substrates 13 and the reinforcing plate 14. In the example shown in the drawings, the substrate 13 and the reinforcing plate 14 are joined while being buried in recesses provided on the upper surface and the bottom surface of the molded body of the foundation 1. Is joined so as to cover the entire top and bottom surfaces of the molded body, whereby the reinforcing effect is further improved. Also bollard 12
Alternatively, the pole 17 may be directly fixed to the substrate 13 on the upper surface of the base 1 without passing through the base 16. In addition, the substrate 13,
The reinforcing plate 14 may be a metal plate such as an iron plate, or a plate whose surface is plated with zinc or the like.

FIG. 5 (a) shows still another embodiment of the foundation of the columnar structure of the present invention, in which a hole 28 for inserting the lower part of the pole of the columnar structure is drilled at a predetermined depth on the upper surface. FIG. 5B is a front view of a portion in which the lower part of the pole 22 of the columnar structure is inserted and fixed in the hole 28 of the foundation 21 made of a foamed synthetic resin molded body, and FIG. 5B is a plan view thereof. The foundation 21 made of a foamed synthetic resin molded body is divided into two by a vertical plane passing through a hole 28 into which the lower part of the pole 22 is inserted, and a connecting shaft (horizontally) is formed between the divided molded bodies 23, 23. The iron plate 25 is joined to the outer surface of each formed body 23 through which the screw shaft 24 is inserted and the screw shaft 24 protrudes, and is fixed with a nut, so that the pole 22 is tightened between the formed bodies 23, 23. They are connected and fixed to each other. The foundation 21 to which the poles 22 are fixed in this way is installed in such a manner that the foundation 1 is installed in a hole where the ground is excavated according to the size of the foundation 1 and the excavated soil is backfilled.

As described above, the lower part of the pole 22 of the structure is inserted into the hole 28 formed in the base 21 made of the divided foamed synthetic resin molded bodies 23, 23, and the divided molded bodies 23, 23 are connected. By connecting and fixing with the shaft (screw shaft) 24 and tightening the pole 22, the pole 22 can be firmly fixed to the foundation 21, and the mounting strength is further improved. Furthermore, the molded body 23 is reinforced by the iron plate 25 by fixing the screw shaft 24 with a nut or the like via a corresponding plate such as an iron plate 25 joined to the outer surface of the molded body 23. Furthermore, by attaching the connecting shaft (screw shaft) 24 so as to protrude laterally from the molded body 24 of the foundation 1 as shown in the figure, the foundation 1 after installation is prevented from rotating underground. Also, the pull-out strength of the foundation 1 is improved. In the illustration, both ends of the connection shaft 24 are fixed with nuts.
The tightening strength of each nut may not be constant.
In such a case, a concave groove is provided around the connecting shaft 24 and C
By fastening with metal fittings or the like, the molded bodies 23 can be uniformly fixed to the whole.

Further, in order to prevent the pole 22 from coming off or rotating from the foundation 1 and firmly fixing the same to the foundation 1 after the pole 22 is attached, as shown in FIG. It is also preferable to adhere rubber 26 to the contact surface of the hole 28 formed in 23 with the pole 22, to reinforce it with an iron plate, or to apply an adhesive or a reinforcing resin. Also,
Rubber 27 or iron wire may be wound around the lower part of the pole 22 fixed to the foundation 1, or a reinforcing resin may be applied, and then the foundation 1 may be attached and tightened. In the illustration, the pole 22, and the hole 28 of the molded body 23 into which the pole 22 is inserted,
Each of them has a circular cross section. However, when the pole 22 has a quadrangular or polygonal cross section, the cross section of the hole 28 of the molded body 23 may have a shape corresponding to the cross section of the pole 22.

FIG. 7 (a) shows another embodiment of the columnar structure of the present invention in which a hole for inserting the lower portion of the pole of the columnar structure is drilled at a predetermined depth on the upper surface. FIG. 7B is a front view of the attached portion, and FIG. 7B is a plan view thereof. The foundation 31 is made of a foamed synthetic resin molded body 33, 33 formed into two parts on a vertical plane passing through the hole 30.
And insert the lower part of the band
To secure the pole 32. Both molded bodies 33, 33
The fastening between them may use a connecting shaft that penetrates horizontally like the previous embodiment. In the foundation 31, each molded body 33 is embedded in an upper support piece 35 that covers the periphery of the hole 30 on the upper surface and supports the periphery of the pole 32 inserted into the hole 30, and inside the molded body 33. The lower support piece 36 that supports the lower end of the pole 32 and the connecting piece 37 that connects the upper and lower support pieces 35, 36 are each formed of a metal plate such as an iron plate formed in a substantially U-shaped cross section. The member 38 is embedded. The support member 38 is formed by simultaneous molding when the molded body 33 is molded.

The upper support piece 35 and the lower support piece 36 of the support member 38 buried in the molded body 33 support the pole 32 around the pole 32 at two upper and lower positions, so that the pole 32 is firmly attached to the foundation 31. The molded body 33 is reinforced by the embedded support member 38. As shown in FIG. 8, the support member 38 joins the upper support piece 35 and the lower support piece 36 to the upper and lower surfaces of the molded body 33 so as to cover the outer surface of the molded body 33 of the foundation 1, and connects the connecting piece 37. It may be provided so as to be joined to the outer surface of the molded body 33. Also in this case, the two molded bodies 33, 33 may be fastened with a connecting shaft (screw shaft) 39 that penetrates horizontally, or may be fastened with a band. Further, it is preferable that the surface of the iron plate or the like of the support member 38 that covers the outer surface of the molded body 33 be subjected to galvanization or the like.

Further, what is shown in FIG.
An anchor shaft 40 projecting downward from the bottom surface of the molded body 33 forming the foundation 31 is fixed to the anchor shaft 40. The anchor shaft 40 in the illustrated example is provided with a return portion 41 at the tip.
The support member 33 thus attached to the foamed synthetic resin molded body
By providing an anchor shaft 40 projecting downward from the bottom of the molded body 33 of the foundation 31 from the base 31, when the foundation 31 is buried in the ground, the anchor shaft 40 digs deeper into the ground than the foundation 31 and installs the foundation 31 The state becomes more stable. Further, the pull-out strength is further improved by the return portion 41 at the tip of the anchor shaft 40.

FIG. 10 (a) shows an anchor via a downwardly protruding mounting shaft 42 fixed to a lower supporting piece 37 of a supporting member 38 mounted so as to cover the outer surface of the molded body 33 of the foundation 31. The plate 43 is attached. In this case,
When the foundation 31 is buried in the ground, the anchor plate 43 penetrates deeper into the ground than the foundation 31 and the soil 31 penetrated between the molded body 33 of the foundation 31 and the anchor plate 43 causes
Is more firmly installed.

Further, as shown in FIG. 10B, if an anchor shaft 44 is protruded further downward from the anchor plate 43,
The installation state of the foundation 31 is further strengthened and stable.

FIG. 11 shows an example in which the above-mentioned anchor shaft is mounted on a foundation in which anchor bolts for fixing columnar structures are embedded, and is embedded in a foundation 51 made of a foamed synthetic resin molded body. The lower part of the pole 52 of the structure is fitted into the anchor bolt 53 and fixed with a nut, and an anchor shaft 54 projecting downward from the bottom surface of the molded body of the foundation 51 is fixed to the anchor bolt 53. FIG. 12A shows an anchor plate 56 attached via an attachment shaft 55 projecting downward from the bottom surface of the molded body of the foundation 51 in which the anchor bolt 53 is embedded.
9 shows an example in which an anchor shaft 57 is protruded further downward from the anchor plate 55. In these cases as well, similarly to the base 31 in FIGS. 9 and 10, the anchor shaft 54, the anchor plate 56, and the anchor shaft 57 projecting downward from the base 51 further strengthen the installation state of the base 51. Is stable.

The foundation 61 of the columnar structure shown in FIG.
The upper end of an anchor shaft 64 which is inserted into the lower part of the pole 62 of the columnar structure and fixed to the upper surface of the foamed synthetic resin molded body fixed thereto, and which penetrates up and down the molded body and projects downward from the bottom surface. Is fixed to the reinforcing plate 63 with a nut.
Also in this case, the anchoring shaft 64 that penetrates the base 61 made of a foamed synthetic resin molded article vertically and protrudes downward from the bottom surface makes the installation state of the base 61 stronger and more stable.
FIG. 13B shows an example in which an anchor plate 66 is fixed with a nut to the tip of a mounting shaft 65 that penetrates the foundation 61 vertically and protrudes downward from the molded body.
FIG. 9C shows an example in which an anchor shaft 67 is protruded downward from the lower surface of the anchor plate 66.

FIG. 14 (a) shows a continuous irregularity along the vertical direction of the outer peripheral surface of the foundation 71 of a columnar structure made of a foamed synthetic resin molded article in which the pole 72 of the columnar structure is inserted and fixed.
73 is provided. By providing the irregularities 73 along the vertical direction of the outer peripheral surface of the foundation 71 made of a foamed synthetic resin molded body, when the foundation 71 is buried in the ground, earth and sand penetrate into the irregularities 73, and the molded body By increasing the contact area between the soil and the earth and sand in which it is buried, the pull-out strength of the foundation 71 from the ground is improved. FIGS. 14B to 14D
FIG. 14B shows another embodiment in which irregularities 73 are provided along the vertical direction of the outer peripheral surface of the foundation 71. FIG.
A plurality of ribs 74 are formed at appropriate places in the vertical direction on the outer peripheral surface of the base 71. FIG. 14C shows a case where a constricted portion 75 is provided at an intermediate portion of the outer peripheral surface of the foundation 71 in the vertical direction. (D)
Is formed by projecting an intermediate portion of the outer peripheral surface of the foundation 71 in the vertical direction outwardly and forming a rib 76. FIG.
The one shown in (e) is not uneven but formed by molding the molded body of the base 71 so as to spread downward. In this case also, the outer surface 77 of the inclined molded body is covered with soil,
In addition, the contact area between the compact and the surrounding
Pullout strength is improved.

FIG. 15 (a) shows a columnar structure made of a foamed synthetic resin molded article provided with a continuous unevenness 82 along the circumferential direction of the outer peripheral surface of the foundation 81. In this way, by providing the unevenness 82 along the circumferential direction of the outer peripheral surface of the foundation 81 made of a foamed synthetic resin molded body, when the foundation is buried in the ground, earth and sand penetrate into the unevenness 82 portion, and The rotation of the foundation 81 in the ground is prevented by increasing the contact area with the earth and sand. FIG. 15 (b) is another embodiment of the unevenness provided along the circumferential direction of the outer peripheral surface of the foundation 81 of the columnar structure, in which a plurality of ribs 83 are formed at appropriate places on the outer surface of the molded body. Even in the case of foundation with ribs 83 formed on the outer peripheral surface
81 rotation is prevented.

FIG. 16 (a) shows a columnar structure 91 made of a foamed synthetic resin molded body provided with a stable shaft 93 which penetrates horizontally through a molded body to which a pole 92 is fixed and projects to both sides. FIG. 16B is a plan view thereof. The stable axis
93 may be a reinforcing bar or the like, or other metal rod. Thus, the base made of the foamed synthetic resin molded body
By providing a stable shaft 93 that penetrates horizontally 91 and protrudes on both sides, when this foundation 91 is buried underground, the stable shaft 93
Penetrates into the ground around the molded body to form a foundation from the ground
The pullout strength of the base 91 is improved, and the rotation of the foundation 91 underground is also prevented. Further, as shown in FIG. 16 (c), a stable shaft 93 projecting sideways from the
If it is connected with a steel plate or the like, the stable shaft 93 is reinforced, and rotation and pulling out of the foundation 91 are more reliably prevented.

Incidentally, since the foundation of the columnar structure according to the present invention is mainly composed of a foamed synthetic resin, it is extremely light in comparison with the conventional method of concrete, and has good workability in transportation and construction.
And cost is significantly improved. However, because of its light weight, when it is submerged in water, it may rise from the foundation, and the columnar structure may be tilted or even fall. Therefore, as shown in FIGS. 17 (a) and (b),
A hole 103 is drilled at a predetermined depth from the upper surface of a base 101 made of a foamed synthetic resin molded body for fixing a pole 102 and the like of a columnar structure, and a heavy object is buried in the hole 103 to be formed of a foamed synthetic resin molded body. By adding a moderate amount of weight to the foundation 101,
Even if 101 is immersed in water, it is prevented from floating. As a heavy object buried in the hole 103, a concrete molded product, a metal, or the like may be molded at the same time as the molding of the foamed synthetic resin molded product, and the hole 103 is opened on the upper surface of the molded product. When the foundation 101 is installed in the ground excavated at the construction site and backfilled, the hole 103 may be simultaneously filled with earth and sand, or concrete may be driven into the hole 103. In this case, since the heavy material is only a part of the foundation 101, there is no problem in the transportation and construction work as in the conventional method in which the entire foundation is made of concrete. Because
The construction period is not significantly prolonged due to curing, forming and removing the formwork.

Further, as described above, a hole 103 is drilled at a predetermined depth in the foundation 101 made of a foamed synthetic resin molded body.
When a heavy object is buried in 3, as shown in FIG. 18, if a large space 105 is formed at the bottom of the hole 103 and the heavy object 104 is buried here, the amount of the buried object can be reduced. Can be increased, and the center of gravity of the base 101 moves downward, thereby increasing stability.

Further, since the foundation of the columnar structure of the present invention is lighter than the concrete of the conventional method, for example, FIG.
In the case of a structure such as a street lamp 112 shown in FIG. 9 (a) whose upper portion is curved or bent laterally and whose center of gravity is displaced from the axis of the pole 113, the holding force for the tilting force tends to be insufficient. is there. Therefore, as shown in FIG. 19 (a), a hole for inserting the lower part of the pole 113 is provided near _one of the foamed synthetic resin molded bodies of the foundation 111 of the columnar structure, that is, L ₁ > L _{2 in the} figure. 113 is inserted and fixed, and as shown in FIG.
An anchor bolt 116 for fixing the pole is buried near one side of the street light 115, that is, L ₃ > L _{4 in the} figure, and the lower part of the street light 117 is fitted into the anchor bolt 116 and fixed with a nut. Can be prevented. Incidentally, in this case, the basics as shown in FIG.
It is also possible to widen only the lower part of 115.

The basis of the columnar structure according to the present invention is as follows:
Because it is made of a foamed synthetic resin molded article, it tends to be inferior to concrete in terms of chemical resistance, oil resistance, weather resistance, and the like.
Therefore, as shown in FIG.
By covering the surface of the foamed synthetic resin molded article 121 with the protective film 122, the foamed synthetic resin molded article buried underground is corroded by oil and other contaminants soaked into the ground.
Alternatively, erosion can be prevented. The protective film 122 can be formed by sticking a non-foamed synthetic resin film on the surface of the molded body, or spraying synthetic resin or concrete on the surface of the molded body. When a non-foamed synthetic resin film is adhered to the surface of a molded article, it can be molded simultaneously with molding of the molded article. Further, as shown in FIG. 20B, in addition to the protective film 122, if a protective cover 123 such as an iron plate or other metal plate or a rubber plate is joined to the surface of the molded body appearing on the ground surface, Can be more reliably protected.

Further, as shown in FIG. 21, a plurality of columnar structures,
For example, two adjacent pillars 13 on a guardrail 132
3, 133 can be attached. In this case, it is extremely easy to adjust the spacing and level between the two supports 133.

Further, as shown in FIG. 22, holes 143, 144 are provided on the side and bottom surfaces of a foundation 141 made of a foamed synthetic resin molded body, and if these are installed near a tree in a park or the like, the foundation 141 can be obtained. The root of the tree extends to the inside of the holes 143 and 144 provided in the base 141, and the effect of stabilizing the foundation 141, and furthermore, the columnar structure 142 installed on the foundation 141 can be expected.

The foundation of the columnar structure according to the present invention as described above is installed in a hole excavated in accordance with the size of the foundation and then backfilled with the excavated soil. The molded body may be fixed by driving concrete around the molded body.

[0057]

The foundation of the columnar structure according to the present invention comprises a foam synthetic resin as a main part instead of the concrete foundation of the conventional method, and is extremely light in comparison with concrete. It is possible to eliminate material transportation, concrete placing work, installation work requiring heavy equipment and the associated danger and traffic obstacles, etc.It is also easier to work, making concrete formwork without the need for curing, Removal is unnecessary and the construction period is short, so that the economic efficiency can be greatly improved.

In the base of the foamed synthetic resin molded article made of such a foamed synthetic resin molded article, if a support plate is fixed between the base shafts of the anchor bolts embedded in the foamed synthetic resin molded article, the foaming of the anchor bolt can be prevented. The receiving surface of the synthetic resin molded body is increased, and the mounting strength of the structure is improved. If the top and bottom of the foamed synthetic resin molded body are sandwiched between the substrate and the reinforcing plate and connected by a shaft member, the mounting strength of the structure is improved. If the lower part of the structure is inserted into the hole drilled in the foamed synthetic resin molded body and the divided molded bodies are connected and fixed with the connecting shaft, the lower part of the structure is firmly tightened by each molded body and the structure Mounting strength is improved.

Further, by supporting the upper and lower portions of the structure by the upper and lower support pieces on the support member, the mounting strength of the structure to the foamed synthetic resin molded article is improved.

Further, the anchor shaft protruding downward from the bottom surface of the foamed synthetic resin molded article improves the installation strength when the foundation is buried in the ground. An anchor plate attached to an attachment shaft projecting downward from the bottom surface of the molded body improves the installation strength of the foundation. Furthermore, the installation strength of the foundation is further improved by projecting the anchor shaft downward from the anchor plate. Further, an anchor shaft or an anchor plate may be provided so as to penetrate the foamed synthetic resin molded article vertically and project downward from the bottom surface.

If irregularities are provided along the vertical direction of the outer peripheral surface of the foamed synthetic resin molded body, the strength of pulling out the foundation from the ground is improved by the earth and sand penetrating into the irregularities.

If irregularities are provided along the circumferential direction of the outer peripheral surface of the foamed synthetic resin molded article, earth and sand penetrate into the irregularities to prevent the foundation from rotating in the ground.

The stable shaft that penetrates the foamed synthetic resin molded article substantially horizontally and protrudes outward improves the pull-out strength of the foundation from the ground and prevents the foundation from rotating in the ground.

The heavy object buried in the hole formed at a predetermined depth from the upper surface of the foamed synthetic resin molded article prevents the foundation buried in the ground from rising when it is submerged in water.

Fixing the lower part of the structure to an anchor bolt buried near one side in the width direction of the foamed synthetic resin molded article;
Alternatively, by inserting and fixing a columnar structure in a hole provided to one side of the foamed synthetic resin molded body, the upper part is curved or bent to the side, and the center of gravity is shifted from the axis of the pole. Since the center of gravity is located near the center of the foundation, the inclination of the columnar structure can be prevented.

The protective cover provided on the upper surface of the base made of the foamed synthetic resin molded article can prevent the foamed synthetic resin molded article from deteriorating due to sunlight or the like. The mounting strength of the object is improved.

By covering the surface of the foamed synthetic resin molded article with a protective film, the foamed synthetic resin molded article buried in the ground is corroded by oil and other contaminants soaked in the ground.
Alternatively, erosion is prevented.

Further, if a reinforcing material such as synthetic fiber, carbon fiber, inorganic fiber, metal fiber and wood chip is included in the foamed synthetic resin molded article, the strength of the foundation is further improved.

The foundation of the columnar structure according to the present invention as described above includes poles, pole lights, bollards, electric poles, traffic lights, display boards and advertising board supports, approach light supports,
Alternatively, it can be used as the basis for a wide range of columnar structures, such as telephone box columns.

[Brief description of the drawings]

FIG. 1A is a front view of a main part showing a state where a pole is attached to a foundation of a columnar structure, and FIG. 1B is a plan view thereof.

FIG. 2A is a perspective view of an anchor bolt embedded in a foundation, and FIG. 2B is a perspective view showing another embodiment of the anchor bolt.

FIG. 3 is a front view of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure.

FIG. 4 is an exploded perspective view of a base portion of the columnar structure shown in FIG.

FIG. 5A is a front view of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure,
(B) is a plan view thereof.

FIG. 6 is a perspective view showing an example of a foamed synthetic resin molded body and a base portion of a pole which constitute a base of a columnar structure.

FIG. 7A is a front sectional view of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure;
(B) is a plan view thereof.

FIG. 8 is a perspective view of a main part showing a state where a pole is attached to another embodiment of the foundation of the columnar structure.

FIG. 9 is a front view of a main part showing a state in which a pole is attached to another example of the foundation of the columnar structure.

FIG. 10A is a front view showing a state in which a pole is attached to another example of a foundation of a columnar structure, and FIG. 10B is a front view of a main part of still another example.

FIG. 11 is a front view of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure.

FIG. 12A is a front view of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure,
(B) is a front view of a part of still another embodiment.

FIG. 13A is a front view of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure,
(B), (c) is a front view of a part of still another embodiment.

14 (a) to (e) are front sectional views of a main part showing a state where a pole is attached to another embodiment of the foundation of the columnar structure.

FIGS. 15A and 15B are plan views of another example of the foundation of the columnar structure.

FIG. 16A is a front view of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure,
(B) is a plan view thereof, and (c) is a plan view of still another embodiment.

FIG. 17A is a front sectional view of a main part showing a state where a pole is attached to another example of a foundation of a columnar structure, and FIG. 17B is a plan view thereof.

FIG. 18 is a front sectional view of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure.

FIGS. 19A and 19B are front cross-sectional views each showing a state in which a pole is attached to another embodiment of the foundation of the columnar structure.

20 (a) and (b) are front sectional views of a main part showing a state where a pole is attached to another example of the foundation of the columnar structure.

FIG. 21 is a side sectional view showing a guardrail in which a plurality of columns are attached to one foundation.

FIG. 22 (a) is a front sectional view showing a state in which a tree root is stretched when a hole is provided in the foundation of a columnar structure,
(B) is a plan sectional view of the foundation.

[Explanation of symbols]

1: foundation, 2: pole, 3: anchor bolt,
4: Base shaft, 5: Reinforcing bar, 6: Support plate, 7: Protective cover, 8: Chestnut stone, 9: Hole, 11: Foundation, 12: Bollard, 13: Board, 14: Reinforcement plate, 15: Connection shaft (screw Shaft), 16: foundation, 17: pole, 21: foundation, 22: pole, 23: molded body, 24: connecting shaft (screw shaft), 25: iron plate, 26: rubber, 27: rubber, 28: hole, 30 :hole,
31: foundation, 32: pole, 33: molded body, 34: band,
35: Upper support piece, 36: Lower support piece, 37: Connecting piece,
38: support member, 39: connecting shaft, 40: anchor shaft,
41: Return part, 42: Mounting shaft, 43: Anchor plate, 44:
Anchor shaft, 51: foundation, 52: pole, 53: anchor bolt, 54: anchor shaft, 55: mounting shaft, 56: anchor plate, 57: anchor plate, 61: foundation, 62: pole, 63: reinforcement plate, 64 : Anchor shaft, 65: Mounting shaft,
66: anchor plate, 67: anchor shaft, 71: foundation, 7
2: Pole, 73: uneven, 74: rib, 75: constricted part, 76: rib, 77: outer surface, 81: foundation, 82: irregular, 83: rib, 91: foundation, 92: pole, 93: stable axis, 94: rebar, 101: foundation, 102: pole,
103: heavy, 105: space, 111: foundation, 112
: Streetlight, 113: pole, 115: foundation, 116: anchor bolt, 117: foundation, 118: pole, 121
: Basic, 122: protective film, 123: protective cover, 131
: Foundation, 132: Guardrail, 133: Support, 141
: Foundation, 142: pole, 143: hole, 144: hole.

Claims (16)

[Claims] 1. A foundation for a columnar structure comprising a foamed synthetic resin molded article, embedded therein with anchor bolts having a plurality of base shafts for fixing the columnar structure, and a support plate fixed between said base shafts. 2. A connecting shaft formed of a foamed synthetic resin molded body, and a substrate for fixing a columnar structure is joined to an upper surface of the molded body and a reinforcing plate is joined to a lower surface of the molded body to connect the substrate and the reinforcing plate to the molded body. The foundation of a columnar structure fixed and connected by 3. A foam synthetic resin molded body formed by forming a hole for inserting a lower portion of a columnar structure on an upper surface at a predetermined depth, and being divided and formed on one or a plurality of vertical surfaces passing through the hole. The base of a columnar structure that is connected and fixed by a connecting shaft that penetrates the divided molded bodies substantially horizontally. 4. An upper supporting member which is formed of a foamed synthetic resin molded body having a hole for inserting a lower portion of a columnar structure at a predetermined depth on an upper surface, and vertically supports a structure inserted into the hole. A base of a columnar structure provided with a support member including a piece, a lower support piece, and a connecting piece for connecting the upper and lower support pieces. 5. A base of a columnar structure comprising a foamed synthetic resin molded body and having an anchor shaft projecting downward from a bottom surface of the molded body. 6. A base of a columnar structure formed of a foamed synthetic resin molded body, wherein an anchor plate is mounted on a mounting shaft projecting downward from a bottom surface of the molded body. 7. A base of a columnar structure made of a foamed synthetic resin molded article and provided with irregularities along a vertical direction of an outer peripheral surface thereof. 8. A base of a columnar structure made of a foamed synthetic resin molded article and provided with irregularities along a circumferential direction of an outer peripheral surface thereof. 9. A foundation for a columnar structure comprising a foamed synthetic resin molded article, and having a stable shaft extending substantially horizontally through the molded article and projecting outward. 10. A base of a columnar structure made of a foamed synthetic resin molded article, wherein a heavy object is buried in a hole formed at a predetermined depth from an upper surface thereof. 11. A base of a columnar structure formed of a foamed synthetic resin molded body and having a columnar structure fixed to one side in the width direction of the molded body. 12. The foundation for a columnar structure according to claim 1, wherein a protective cover is provided on the upper surface of the foamed synthetic resin molded body. 13. The base of the columnar structure according to claim 1, wherein the surface of the foamed synthetic resin molded article is covered with a protective film. 14. The columnar structure according to claim 1, wherein the base resin of the foamed synthetic resin molded article is at least one selected from the group consisting of polystyrene, polypropylene, polyethylene, and polyurethane. Foundation. 15. The foamed synthetic resin molded article contains at least one reinforcing material selected from the group consisting of synthetic fibers, carbon fibers, inorganic fibers, metal fibers, and wood chips. The foundation of the columnar structure according to 1. 16. The pillar structure may be a pole, a pole light, a bollard, a telephone pole, a traffic signal, a support of a display board or a billboard, a support of an approach light, a support of a fence, a support of a guardrail, a support of a post box, or a telephone. The foundation of a columnar structure according to any one of claims 1 to 15, which is a support of a box.