JP2017160658A - Structure foundation and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure foundation construction method capable of reducing curing period of a filler material used for solar power generation panel device and other foundation structures resulting in a reduction of construction period.SOLUTION: The method of constructing a structure foundation 10 for supporting a post 21 of a structure 1, includes the steps of: forming a foundation hole 4a in a the ground 4; disposing the lower end part of the post 21 in a foundation hole 4a; and filling the foundation hole 4a with a filler material 11 to embed the lower end part of the post 21 in the filler material 11. As the filler material 11, an urethane resin is used.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foundation structure of a structure such as a photovoltaic power generation panel device and a construction method thereof, and more particularly to a foundation structure including a filler filled in a foundation hole of the ground and supporting a lower end portion of a support column and a construction method thereof. .

  For example, according to the construction method of the photovoltaic power generation panel device described in Patent Document 1, a foundation hole is formed in the ground, cement milk is poured into the foundation hole, and the lower end portion (iron core) of the support is inserted. As the cement milk solidifies, the lower end of the column is fixed. After that, a frame such as a pedestal is assembled on the column and a photovoltaic power generation panel is installed.

Japanese Patent No. 5468701

Cement-containing materials such as cement milk, mortar, and concrete have a long curing period (for example, 1 day or more) until solidification. During this curing period, it is necessary to wait for the installation of the gantry and the photovoltaic power generation panel, and the construction period becomes long.
In view of such circumstances, an object of the present invention is to shorten the curing period of the filler used for the foundation structure of the photovoltaic power generation panel device and other structures, and thus to shorten the construction period.

In order to solve the above-mentioned problems, the structure of the present invention is a foundation structure that supports the pillars of a structure,
With a filler filled in the base hole formed in the ground,
The lower end of the column is embedded and supported in the filler,
The filler includes a urethane resin.
The method of the present invention is a method for constructing a foundation structure that supports a column of a structure,
Forming a base hole in the ground,
Place the lower end of the column in the foundation hole,
And by filling the base hole with a filler, the lower end of the column is embedded in the filler,
The filler includes a urethane resin.
As a result, the curing time of the filler can be shortened, and consequently the construction period can be shortened. In addition, the required strength can be sufficiently developed as a filler for the basic structure.

It is preferable that crushed stone is mixed in the filler of the basic hole.
It is preferable that the crushed stone is poured into the base hole, and then the filler is poured into the base hole and filled.
The particle size of the crushed stone is preferably 2.5 mm or more.

  According to the present invention, by using a urethane resin as a filler for the basic structure of a structure, the curing time can be shortened, and consequently the construction period can be shortened. And the required intensity | strength as a foundation structure can fully be expressed.

FIG. 1 is a sectional side view of a photovoltaic power generation panel device according to an embodiment of the present invention. FIG. 2 is a cross-sectional side view showing a drilling step in the construction method of the photovoltaic power generation panel device. FIG. 3 is a cross-sectional side view showing a supporting jig installation step in the construction method of the photovoltaic power generation panel device. FIG. 4 is a cross-sectional side view showing a crushed stone charging step in the construction method of the photovoltaic power generation panel device. FIG. 5 is a cross-sectional side view showing a urethane liquid filling-curing process in the construction method of the photovoltaic power generation panel device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the construction target structure of this embodiment is a photovoltaic power generation panel device 1. The photovoltaic power generation panel device 1 includes an underground foundation structure 10 and a ground device upper structure 20.

  The apparatus superstructure 20 includes a plurality of support columns 21, 21, a panel mount 22, and a photovoltaic power generation panel 23. A panel mount 22 is installed on the ground portion of the column 21. A photovoltaic power generation panel 23 is installed on the panel mount 22.

  A foundation hole 4 a is formed in the ground 4 where the support columns 21 are installed. A foundation structure 10 is constructed in the foundation hole 4a. The lower end portion (pile portion) of the vertical column 21 is inserted and fixed inside the foundation structure 10. The ground 4 is a shallow mixing process that excavates the ground to be improved using a backhoe, etc., backfills while mixing lime, cement, cement-based solidified material, etc., and sufficiently compacts by rolling with a roller or rammer. It is preferable that the ground is improved by a construction method or the like and the N value by the standard penetration test is 4 or more. The N value is the number of hits required to drop a weight of 63.5 kg from a height of 75 cm and the penetration sampler goes around 30 cm.

The depth of the foundation hole 4a, that is, the height of the foundation structure 10 is, for example, about 100 mm to 1500 mm, preferably about 500 mm to 1000 mm, more preferably about 800 mm, but the present invention is not limited to this. Absent.
The diameter of the foundation hole 4a and the diameter of the foundation structure 10 are, for example, about 50 to 200 mm, preferably about 100 mm to 150 mm, and more preferably about 125 mm, but the present invention is not limited to this.

  The foundation structure 10 may be formed of only the filler 11, but preferably includes the filler 11 and the crushed stone 15. In this embodiment, the base hole 4 a is filled with the filler 11, and a large number of crushed stones 15 are dispersed and mixed in the filler 11. In addition, although the filler 11 and the crushed stone 15 may knead the urethane liquid 11A and the crushed stone 15 and fill the basic hole 4a, it is preferable to flow the urethane liquid 11A into the basic hole 4a packed with the crushed stone 15. .

  The particle size of the crushed stone 15 is 2.5 mm or more, preferably 5 mm to 80 mm, and more preferably about 10 mm to 50 mm. If the particle size is smaller than 2.5 mm, the urethane liquid 11a is less likely to flow between the crushed stones 15 and voids are likely to be generated. If it is larger than 75 mm, it becomes difficult to throw crushed stones into the foundation holes. By mixing the crushed stone 15 in the filler 11, the strength of the foundation structure 10 can be improved and the weight as the foundation structure can be increased. The crushed stone having a particle size of 2.5 mm or more is a crushed stone having a mass percentage of 5% or less when passing through a 2.36 mm mesh screen specified in JISZ8801.

  As such crushed stones, JIS4005, JIS2505, JIS2005, JIS1505, JIS1305, JIS1005, JIS8040, JIS6040, JIS4020, JIS2515, JIS2015, JIS2513, JIS2013, JIS2510, JIS2010, S-80 (1 ), S-60 (2), S-40 (3), S-30 (4), S-20 (5) S-13 (6), and other gardens that can be purchased at home centers Examples include rock and gravel.

  The filler 11 is made of a urethane resin. As the material for the urethane resin in the present invention, a material containing a sodium silicate solution and an isocyanate compound is preferably used.

The sodium silicate _{solution, Na 2 O · 2SiO 2 ·} aq ( sodium silicate No. 1 molar ratio _{2), 2Na 2 O · 5SiO} 2 · aq ( sodium silicate No. 2 molar ratio _{2.5), Na 2 O · 3SiO} 2 · aq (sodium silicate No. 3 molar ratio _{3), Na 2 O · nSiO} 2 · aq ( special sodium silicate mole ratio from 1.7 to 4), and the like. The molar ratio of Na ₂ O / SiO ₂ is preferably 2.0 to 3.0.
Further, the sodium silicate solution may contain additional components such as a catalyst, water, polyol, surfactant, flame retardant and the like.
The specific gravity of the sodium silicate solution in an atmosphere of 20 ° C. is about 1.25 to 1.75.
The viscosity of the sodium silicate solution in an atmosphere at 25 ° C. is 500 mPa · s or less, preferably 10 to 500 mPa · s, more preferably 40 to 250 mPa · s.

Isocyanate compounds include diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, tolylene diisocyanate, polytolylene polyisocyanate, xylylene diisocyanate, naphthalene diisocyanate, hexamethylene diisocyanate, isophorone, which are compounds containing at least two isocyanate groups in one molecule. Examples include diisocyanates, urethane prepolymers having isocyanate groups at the molecular ends, isocyanurate-modified products of polyisocyanates, and carbodiimide-modified products. Preferably, it is an isocyanate compound containing at least two isocyanate groups in one molecule.
Furthermore, the isocyanate compound may contain additional components such as a catalyst, water, a polyol, a surfactant, and a flame retardant.
The specific gravity of the isocyanate compound in the 20 ° C. atmosphere is about 1.1 to 1.4.
The viscosity of the isocyanate compound in an atmosphere at 25 ° C. is 500 mPa · s or less, preferably 10 to 500 mPa · s, more preferably 40 to 250 mPa · s.

  Here, the sodium silicate solution and the isocyanate compound are stirred and mixed to form a urethane liquid, and then poured into the base hole filled with crushed stone and filled with the urethane liquid without leaking, Since it is necessary to have appropriate fluidity and viscosity so that the urethane liquid does not penetrate into the ground from the basic hole, the viscosity at 25 ° C. is preferably in the range of 10 to 500 mPa · s.

The mixing ratio (weight ratio) of the sodium silicate solution and the isocyanate compound is 0.6: 1.4 to 1.4: 0.6, preferably 0.8: 1.2 to 1.2: 0.8. More preferably, it is about 1: 1.
The specific gravity of the urethane liquid obtained by mixing the sodium silicate solution and the isocyanate compound is usually 1 or more, preferably 1.2 to 1.4, and more preferably about 1.32. Since the specific gravity is larger than 1, even when the urethane liquid is filled into the accumulated basic holes such as rainwater, the water can be pushed up and filled with the urethane liquid.
It is preferable that the urethane resin is substantially non-foamed. The expansion ratio of the urethane-based resin is preferably about 1.0 to 1.5, and more preferably about 1.1.

The construction method of the photovoltaic power generation panel device 1 will be described focusing on the construction of the foundation structure 10.
<Hole drilling>
As shown in FIG. 2, a base hole 4 a is formed at a predetermined position on the ground 4 with a crawler drill (not shown) or the like.

<Installation of support jig>
As shown in FIG. 3, a support jig 5 (template) is installed on the ground. The support jig 5 includes a horizontal beam 5a, a leg portion 5b that supports the beam 5a, and a holding portion 5c provided on the beam 5a.
<Post insertion>
Next, the lower end of the column 21 is inserted into the foundation hole 4a. The column 21 is supported by the holding portion 5c of the support jig 5 while adjusting the height. The holding | maintenance part 5c and the support | pillar 21 can be connected by bolting etc., for example. Preferably, the lower end of the column 21 is supported by being slightly lifted from the bottom of the foundation hole 4a.

<Crushing stone>
Next, as shown in FIG. 4, the crushed stone 15 is introduced between the inner periphery of the foundation hole 4 a and the support column 21. The input amount is set such that the depth from the ground opening of the foundation hole 4a to the crushed stone 15 is, for example, 0 mm to 120 mm.

<Urethane liquid generation>
Separately, the urethane liquid 11A (FIG. 5) is produced by mixing the sodium silicate solution and the isocyanate compound with stirring. The stirring and mixing time is about 60 seconds. It is preferable to use a stirrer for stirring and mixing.

<Urethane liquid filling>
As shown in FIG. 5, by flowing the generated urethane liquid 11A into the base hole 4a, the urethane liquid 11A flows through the gaps between the crushed stones 15 and is filled in the base hole 4a. Preferably, the urethane liquid 11A is subdivided into a bucket from a stirrer, and poured into each basic hole 4a from the bucket. There is no need to use a large machine, and workability is good.
When using cement or the like, it is necessary to knead the crushed stone and cement and fill the basic hole 4a. Therefore, it takes time and labor to knead and fill the basic hole 4a with the weight of the crushed stone, According to the present embodiment, the crushed stone 15 can be charged and the urethane liquid 11A can be filled individually, so that workability is good and work can be performed in a short time.
<Urethane solution curing>
Although depending on the temperature, the urethane liquid 11A is cured in 20 minutes at 20 ° C. to become a filler 11 made of a cured urethane resin, and strength is generated. Therefore, the curing period is extremely short compared to cement-containing materials such as cement, mortar, and concrete.

<Superstructure construction>
As a result, the panel mount 22 can be assembled to the support column 21 with little time after filling with the urethane liquid 11A (FIG. 1). Furthermore, the photovoltaic power generation panel 23 is installed on the panel mount 22.
Thus, the solar power generation panel device 1 can be constructed in a short time.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
The urethane-based resin is not particularly limited as long as it has physical properties necessary as a basic structure and can be filled by pouring into a basic hole filled with crushed stone.
The structure to be constructed is not limited to the photovoltaic power generation panel device 1 and may be a sign post, a sign post, or the like.

  The present invention can be applied to a basic structure of a photovoltaic power generation panel device, for example.

1 Solar power generation panel device (structure)
4 Ground 4a Base hole 5 Support jig 5a Beam 5b Leg 5c Holding part 10 Base structure 11 Filler 11A Urethane liquid 15 Crushed stone 20 Upper part structure 21 Support column 22 Panel mount 23 Solar power generation panel

Claims (5)

A basic structure that supports the struts of a structure,
With a filler filled in the base hole formed in the ground,
The lower end of the column is embedded and supported in the filler,
A basic structure of a structure, wherein the filler includes a urethane resin.   The foundation structure of the structure according to claim 1, wherein crushed stone is mixed in the filler of the foundation hole. A method of constructing a foundation structure for supporting a structure pillar,
Forming a base hole in the ground,
Place the lower end of the column in the foundation hole,
And by filling the base hole with a filler, the lower end of the column is embedded in the filler,
The method for constructing a basic structure of a structure, wherein the filler includes a urethane-based resin.   The method for constructing a foundation structure according to claim 3, wherein after filling the foundation hole with crushed stone, the filler is poured into the foundation hole and filled.   The foundation structure construction method according to claim 4, wherein a particle size of the crushed stone is 2.5 mm or more.

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