JP6424061B2 - Foundation pile and its installation method - Google Patents

Description

  The present invention relates to a foundation pile and a method for installing the foundation pile.

  For example, when installing a stand of solar panels (solar cell panels) for field solar power generation, there is a method of building a concrete foundation and building a panel stand on it, but it takes time to cure concrete, There was a problem that the remaining soil treatment was troublesome. Therefore, today, a foundation pile method using a screw pile (also referred to as a spiral pile or a spiral pile) in which screw blades are spirally wound around the outer periphery of a steel pipe has begun to spread (for example, see Patent Document 1). .

  The foundation pile method using screw piles is a method for obtaining foundation support by rotating the screw piles and penetrating them into the ground, pressing the earth and sand in the ground sideways and compressing them. This is a method that contributes to shortening the construction period.

JP 2010-236344 A

  By the way, since the power generation efficiency of solar panels greatly depends on the installation angle of the panel surface, etc., the screw piles for solar panels need to be installed after performing surveying with precision to achieve optimal power generation efficiency. is there. At this time, for example, disposable chopsticks colored in red or the like are inserted into the ground to mark civil engineering surveys and screw pile installation locations.

  However, when a mark such as disposable chopsticks is temporarily installed, it is necessary to remove the mark when installing a screw pile for solar panels. There is a problem of inefficiency.

  Moreover, since the mark is removed when installing the screw pile, an error is apt to occur in the installation position, which may affect the installation accuracy of the screw pile.

  Therefore, the present invention has been made paying attention to such problems, it is not necessary to remove the mark when installing the screw pile, the work efficiency is good, and the installation accuracy of the screw pile is improved. It aims at providing the foundation pile which can do and its installation method.

In order to solve the above-mentioned problem, the foundation pile according to the present invention is provided with screw blades on the outer peripheral surface of a hollow steel pipe, the front end portion is open, and the rear end portion is connected to a rotating device to rotate. The screw pile installed by entering into the ground from the tip, and used for positioning the screw pile installation location by piercing the screw pile installation location, and the maximum width in plan view is the screw pile and the inner diameter of the about the same possess a positioning member enters into the screw pile, the positioning member includes a shaft portion piercing the installation location of the screw pile, provided in the longitudinal direction of the intermediate of the shaft portion When the positioning member enters the screw pile, the maximum width in plan view is substantially the same as the inner diameter of the screw pile, and the shaft portion passes through the center of the screw pile. A center guide portion for guiding the screw pile so that a center of the pile and a center of the shaft portion substantially coincide with each other, and a tip end of the shaft portion protrudes from the center guide portion, while the center guide portion is the shaft A lower end portion or a lower side surface that is symmetric with respect to the axis of the shaft portion, and a lower end portion or a lower side surface of the central guide portion that is symmetric with respect to the axis center of the shaft portion with respect to the axis of the shaft portion It is characterized by being located on one vertical plane .
Here, it is further preferable that the screw pile is configured such that the rear end portion is also opened and the positioning member passed from the front end portion can be taken out from the rear end portion.
The positioning member is further preferably provided with a mark on the upper end thereof.
Moreover, the installation method of the foundation pile which concerns on this invention is the process of embedding the said positioning member in the above-mentioned any foundation pile in the installation location of the said screw pile, and the upper end part of the said positioning member pierced by the installation location And passing the tip of the screw pile through, and rotating the screw pile with the positioning member inside the screw pile and installing the screw pile at the installation location. Features.
Here, in the step of embedding the positioning member, the installation location of the screw pile is specified by surveying using the positioning member as a mark, and the positioning member is embedded in the identified installation location of the screw pile. May be.

The foundation pile and its installation method according to the present invention are a screw pile whose tip is opened with a hollow steel pipe, and a positioning member whose maximum width in plan view is not more than the inner diameter of the screw pile and enters the screw pile Therefore, it is possible to install a positioning member in advance at the installation location of the screw pile, and to install the screw pile by inserting the tip of the screw pile from above the positioning member.
Therefore, when installing the screw pile, it is not necessary to remove the positioning member that is the mark, so that the screw pile can be continuously installed, the work efficiency is improved, and the installation accuracy of the screw pile is improved. be able to.

It is a figure which shows the state which installed the mount frame on the foundation pile of embodiment which concerns on this invention, and set the solar panel on it. It is a front view which shows the structure of the foundation pile of embodiment which concerns on this invention. It is a figure which shows the characteristic of the foundation pile of embodiment which concerns on this invention. It is a figure which shows the state which driven the positioning member into the ground in the installation method of the foundation pile of embodiment which concerns on this invention. It is a figure which shows the state which moved the screw pile above the positioning member in the installation method of the foundation pile of embodiment which concerns on this invention. It is a figure which shows the state which put the positioning member in the screw pile in the installation method of the foundation pile of embodiment which concerns on this invention. It is a figure which shows the state which has driven the screw pile into the ground in the state which put the positioning member in the screw pile in the installation method of the foundation pile of embodiment which concerns on this invention. It is a figure which shows the state which installation of the screw pile was completed in the installation method of the foundation pile of embodiment which concerns on this invention. It is a figure which shows the state which removed the positioning member after installation of a screw pile was completed in the installation method of the foundation pile of embodiment which concerns on this invention. It is a figure which shows the example of the other positioning member in the foundation pile of embodiment which concerns on this invention. (A), (b) is a figure which shows the modification of the upper end part of the axial part in the positioning member in the foundation pile of embodiment which concerns on this invention, respectively.

  Hereinafter, the embodiment of the foundation pile and the installation method concerning the present invention is described. In addition, although the foundation pile of embodiment described below and its installation method are demonstrated as an example the foundation pile for solar panel (solar cell module) installation and its installation method, the foundation pile and its installation method which concern on this invention are demonstrated. Is not limited to the installation of solar panels.

  As shown in FIG. 1, the foundation pile 1 of embodiment is for installing the mount 3 of the solar panel (solar cell module) 2 on it, and is embedded in the ground 4 in the state which protruded the head. As shown in FIG. 2, the screw pile 11 and the positioning member 12 are included.

  In the screw pile 11, screw blades 11b are spirally provided on the outer peripheral surface of a hollow and cylindrical steel pipe 11a, and the front end part 11a1 and the rear end part 11a2 of the steel pipe 11a are opened with a predetermined inner diameter R1. At the same time, a connecting portion 11a3 is provided on the outer peripheral surface in the vicinity of the rear end portion 11a2 for connecting with a rotating device of a hydraulic auger or a digging pillar car (not shown).

  The positioning member 12 is used for positioning the installation location of the screw pile 11, and as shown in FIG. 2 and FIG. 3, the shaft portion 12a whose tip portion pierces the ground 4 and the middle in the longitudinal direction of the shaft portion 12a. The center guide part 12b provided in the.

  The shaft portion 12a is composed of a hollow or solid metallic rod-shaped member made of iron, aluminum, stainless steel or the like having a predetermined length, or a rod-shaped member other than metal such as glass fiber, and the steel pipe 11a of the screw pile 11 The outer diameter is smaller than the inner diameter R1. In addition, the shaft portion 12a may be provided with a mark 12d for the surveying instrument at the upper end portion as shown in FIG. 11 (a) so as to facilitate civil engineering surveying, or may be configured to be extendable so that the length can be changed. good.

  The center guide portion 12b is formed, for example, by joining four guide plates 12b1 of the same shape every 90 degrees and passing through the shaft portion 12a at the joint portion which is the center, as shown in FIG. Is set to be equal to or smaller than the inner diameter R1 of the steel pipe 11a of the screw pile 11 so as to pass through the steel pipe 11a of the screw pile 11 from the front end portion 11a1 to the rear end portion 11a2.

  Here, in the present embodiment, as shown in FIG. 3, the maximum width in plan view of the center guide portion 12 b is substantially the same as or slightly smaller than the inner diameter R <b> 1 of the steel pipe 11 a of the screw pile 11. When the positioning member 12 enters the steel pipe 11a, the center of the screw pile 11 and the center of the positioning member 12 are configured to substantially coincide with each other.

  Moreover, in this embodiment, when the center part of the steel pipe 11a and the center of the positioning member 12 have shifted | deviated a little by notching the corner | angular part of each guide plate 12b1 diagonally as shown in FIG. 3, the steel pipe 11a Is provided with an inclined guide portion 12b2 that contacts the lower end of the steel pipe 11a and guides the center of the steel pipe 11a to the center of the positioning member 12. However, providing the inclined guide portion 12b2 is optional and may be omitted, or may be provided only at the upper corner.

  In this embodiment, since the positioning member 12 is reused many times as described later, as shown in FIG. 8 described later, the length from the lower end portion of the center guide portion 12b to the upper end portion of the shaft portion 12a. H1 is substantially the same as or slightly longer than the protruding height (length) H2 after the installation of the screw pile 1 is completed. However, if the positioning member 12 can be pulled out after the installation of the screw pile 11 is completed, there is no problem even if the length H1 is shorter than the protruding height (length) H2 after the installation of the screw pile 1 is completed.

  Next, the installation method using the foundation pile 1 of the solar panel 2 comprised as mentioned above is demonstrated.

[Positioning member installation process]
First, surveying is carried out according to the layout of the solar panel 2 to be installed and its mount 3, etc., and the installation location of each screw pile 11 is determined on the ground 4, and each installation location is shown in FIG. The positioning member 12 is pierced and buried.

  At this time, the positioning member 12 can be used as a marker for surveying, and can be buried as it is at the installation place of the screw pile 11.

[Screw pile placing process]
Next, as shown in FIG. 5, the screw piles 11 attached to the tips of the working arms of a hydraulic auger or a digging pillar car (not shown) are buried at each installation location on the ground 4. The positioning member 12 is moved upward and lowered toward the positioning member 12.

  Then, since the front-end | tip part 11a1 of the steel pipe 11a of the screw pile 11 is open | released, since the axial part 12a of the positioning member 12 is an outer diameter very much smaller than the internal diameter R1 of the steel pipe 11a of the screw pile 11, it is very easy to axis. The upper end portion of the portion 12 a enters the steel pipe 11 a of the screw pile 11.

  Moreover, since the maximum width W in plan view of the center guide portion 12b of the positioning member 12 is equal to or smaller than the inner diameter R1 of the steel pipe 11a of the screw pile 11 and is substantially the same as or slightly smaller than the inner diameter R1 of the steel pipe 11a, FIG. Thus, the positioning member 12 also passes through the steel pipe 11 a of the screw pile 11.

  In that case, when the center of the steel pipe 11a of the screw pile 11 and the center of the positioning member 12 have shifted | deviated, the lower end edge of the steel pipe 11a contact | abuts to the upper end surface of the center guide part 12b, and the positioning member 12 is in the steel pipe 11a. There is a case where the center guide part 12b does not enter.

  However, even in such a case, it is only necessary to move the screw pile 11 in the horizontal direction until the lower end edge of the steel pipe 11a is not in contact with the upper end surface of the center guide portion 12b. It becomes possible to match the center, and the center guide portion 12b of the positioning member 12 enters the steel pipe 11a.

  Therefore, since it can guide so that the center of the screw pile 11 and the center of the positioning member 12 may correspond substantially by the center guide part 12b of the positioning member 12, it installs the screw pile 11 correctly in the installation location measured and determined. Is possible.

  Further, since the four guide plates 12b constituting the center guide portion 12b of the positioning member 12 are provided with inclined guide portions 12b2 that are obliquely cut out (see FIG. 5), the steel pipe 11a. And the center of the positioning member 12 are slightly shifted from each other, the lower end portion of the steel pipe 11a hits the inclined guide portion 12b2 above the guide plate 12b constituting the center guide portion 12b of the positioning member 12, and the screw pile 11 And the center of the positioning member 12 can be smoothly guided.

  When the screw pile 11 is rotated by an auger (not shown), the screw pile 11 is driven into the ground 4 by the screw blade 11b and enters as shown in FIG. A center guide portion 12b configured by joining four guide plates 12b1 serves as a resistor.

  In addition, when the different diameter part with an upper end side is provided in the lower end side of the axial part 12a of the positioning member 12, it becomes a rotation stop.

  Therefore, even if the screw pile 11 is rotated by an auger (not shown) with the positioning member 12 inside the screw pile 11, the positioning member 12 does not enter the ground 4 as shown in FIG. Instead, only the screw pile 11 enters (penetrates) into the ground 4 of the installation location.

  As a result, unlike the conventional case, the screw pile 11 can be continuously installed without the need to pull out the positioning member 12 when the screw pile 11 is installed, so that the work efficiency can be improved and the construction period can be shortened. it can.

  Moreover, since it is not necessary to remove the positioning member 12 when installing the screw pile 11, an error does not arise in the installation position of the screw pile 11, and the installation accuracy of the screw pile is improved.

[Pulling step of positioning member 12]
Then, when the screw pile 1 enters (penetrates) the ground 4 to a predetermined depth and removes the connecting portion of the auger (not shown) from the upper end portion of the screw pile 1, as shown in FIG. The height (length) H1 from the lower end portion of the center guide portion 12b to the upper end portion of the shaft portion 12a is designed to be substantially the same as or slightly larger than the height (length) H2 protruding from the ground 4 of the screw pile 1. Therefore, even when the screw pile 1 is driven into the ground 4, the upper end portion of the shaft portion 12 a of the positioning member 12 protrudes.

  Therefore, after the installation of the screw pile 11 is completed, the positioning member 12 can be pulled out and removed from the opening 11a2 at the rear end of the screw pile 11, as shown in FIG.

  As a result, the extracted positioning member 12 can be reused, and the environment-friendly foundation pile 1 with less waste and its installation method can be provided.

  As explained above, according to the foundation pile 1 of this embodiment and the installation method thereof, the pile pile 11 having a hollow steel pipe 11a with the distal end portion 11a1 opened and the maximum width in plan view. Since the positioning member 12 is configured such that W is equal to or smaller than the inner diameter R1 of the screw pile 11 and enters the screw pile 11, the positioning member 12 is installed in advance at the installation location of the screw pile 11, and the upper side of the positioning member 12 It becomes possible to install the screw pile 11 by inserting the tip of the screw pile 11.

  Therefore, when installing the screw pile 11, it is not necessary to remove the positioning member 12 as a mark, so that the screw pile 11 can be continuously installed, the work efficiency is improved, and the installation accuracy of the screw pile is improved. Can be improved.

  Further, after the installation of the screw pile 11 is completed, the positioning member 12 can be pulled out from the rear end portion of the screw pile 11 and reused, and the environment-friendly foundation pile 1 with little waste can be provided.

  In the above description, as shown in FIGS. 2 and 3, the positioning member 12 is composed of a shaft portion 12a and a central guide portion 12b in which four guide plates 12b1 are joined every 90 degrees. However, the present invention is not limited to this. For example, as shown in FIG. 10, as shown in FIG. 10, a disc-shaped center guide portion having a diameter R2 that is substantially the same as or slightly smaller than the inner diameter R1 of the steel pipe 11a of the screw pile 11. You may comprise by 12c.

  In addition, after the installation of the screw pile 1 is completed, it is of course possible to provide a pull-out connecting portion 12e as shown in FIG.

DESCRIPTION OF SYMBOLS 1 Foundation pile 11 Column side metal fitting 11a Steel pipe 11a1 Tip part 11a2 Rear end part 11a3 Connection part 11b Screw blade 12 Positioning member 12a Shaft part 12b, 12c Center guide part 12b1 Guide plate 12b2 Inclined guide part 12d Marking part 12e Pull-out connection part Solar panel 3 mount 4 ground

Claims (5)

Screw blades are provided on the outer peripheral surface of the hollow steel pipe, and the front end thereof is open, while the rear end is connected to a rotating device and rotated to enter the ground from the front end. With screw piles,
A positioning member that pierces the installation location of the screw pile and is used for positioning the installation location of the screw pile, and has a maximum width in plan view that is substantially the same as the inner diameter of the screw pile and enters the screw pile. Yes, and
The positioning member is
A shaft portion that pierces the installation location of the screw pile,
Provided in the middle of the longitudinal direction of the shaft portion, the maximum width in plan view is substantially the same as the inner diameter of the screw pile, and when the positioning member enters the screw pile through the shaft portion at the center A center guide portion for guiding the screw pile so that the center of the screw pile and the center of the shaft portion substantially coincide with each other.
The tip of the shaft portion protrudes from the center guide portion, while the center guide portion has a lower end portion or a lower side surface that is point-symmetric with respect to the shaft center of the shaft portion, and is pointed with respect to the shaft center of the shaft portion. The foundation pile according to claim 1, wherein a lower end portion or a lower side surface of the center guide portion that is symmetric is located on one vertical plane perpendicular to the axis of the shaft portion . In the foundation pile according to claim 1,
The screw pile has a rear end portion that is also open, and is configured such that the positioning member passed from the front end portion can be taken out from the rear end portion . In the foundation pile according to claim 1 or claim 2,
The positioning pile is provided with a mark on an upper end portion thereof . A step of embedding the positioning member in the foundation pile according to any one of claims 1 to 3 at an installation location of the screw pile;
Passing the tip of the screw pile from the upper end of the positioning member pierced at the installation location;
A step of rotating the screw pile in a state where the positioning member is put inside the screw pile and installing the screw pile at the installation location;
A method for installing a foundation pile characterized by comprising: In the installation method of the foundation pile of Claim 4,
In the step of embedding the positioning member, the installation location of the screw pile is specified by surveying using the positioning member as a mark, and the positioning member is embedded in the specified installation location of the screw pile. How to install foundation piles.

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