JP5433733B2 - Foundation pile - Google Patents

Description

The present invention relates to the structure of a foundation pile.

In recent years, mega solar power generation has attracted attention as the interest in clean energy has increased. Mega solar power generation is a power generation system that lays tens of thousands of solar power generation modules on a vast site and generates solar power of over 1 megawatt. In the past, most of the construction of mega solar power plants was to install foundation concrete on a leveled site, and to install a platform for a solar cell array (an assembly of photovoltaic modules) on the foundation. (See Patent Document 1). However, the production of foundation concrete requires a lot of work and time, such as the need for formwork and curing after placing concrete, and the material cost is very high due to the large site. . Therefore, it is conceivable to use foundation piles instead of foundation concrete. However, since the solar cell array is installed obliquely toward the south, very strong lift may be applied depending on the wind direction.

Conventionally, in order to prevent the foundation pile from being pulled out from the ground by the lifting force acting on this solar cell array, after the foundation pile is placed, a part of the portion buried in the ground is deformed to cope with the pulling force. Techniques for increasing resistance have been proposed (see Patent Document 2 and Patent Document 3).

JP 2011-911166 A JP 2005-61159 A Utility Model Registration No. 3135734

However, in the prior art, a relatively short plate-like object is used as a resistor in consideration of the ease of deformation in the ground, so a sufficient resistance is expected for a relatively soft ground. There are things that cannot be done. In particular, since the resistor shown in Patent Document 2 is configured to rotate and deform around the lower end, the pile may be pushed up to the ground by the reaction during deformation. . Furthermore, since the soil that was originally on the resistor is pushed to the side along with the deformation of the resistor, the soil tightness of the upper part of the resistor after the deformation becomes rough, and the resistance force decreases conversely Sometimes.

The present invention was made in order to solve the problems existing in the above-described prior art, and provides a structure of a foundation pile in which a resistor can be easily deformed and a sufficient resistance can be expected after deformation. .

The foundation pile includes a main column having a hollow portion, a resistance unit provided to be expandable on a side of the main column, and a drive unit provided to be movable in a distal end direction of the main column, and the resistance unit Is provided with a first resistor located on the rear end side of the main pillar, and a second resistor located on the front end side of the main pillar and connected to the first resistor so as to be bendable. The drive unit includes a first moving body that is bendably connected to the first resistor, and a second moving body that is bendably connected to the second resistor.

The foundation pile expands toward the side while the first resistor and the second resistor are bent at the connection portion, thereby expanding the projected area and increasing the resistance to the pulling force. Furthermore, by arranging the first resistor and the second resistor in a truss shape, the structural strength can be dramatically improved as compared with the conventional resistor. In this case, the penetration input to the soil around the main pillar is increased, so that it can be applied to hard land. Moreover, since it becomes possible to expand a resistor more largely, resistance can be raised further.

As a means for applying an external force to the first moving body and the second moving body, a configuration in which a striking force is applied to the first moving body from the rear end side of the main pillar can be employed. In this case, the first moving body moves relatively large toward the tip side of the main column, and the second moving body moves relatively small toward the tip side of the main column. By guiding the first resistor and the second resistor to bend in a predetermined direction when the body moves relatively small toward the distal end side of the main pillar, The bending of the second resistor can be smoothly induced.

As still another means, a configuration in which a female screw is provided in each of the first moving body and the second moving body and a rotational driving force is applied to the male screw that is screwed to the female thread can be employed. In this case, the first moving body moves to the front end side of the main pillar, the second moving body moves to the rear end side of the main pillar, and is configured to be close to each other. The bending of the second resistor can be smoothly induced.

The foundation pile of the present invention can easily deform the resistor by applying an external force to the main pillar after placing, and dramatically expands the structural strength compared to the conventional resistor by expanding it into a truss shape. Can be improved. By increasing the structural strength, the resistor can be expanded more greatly, and the resistance can be further increased. In addition, since the penetrating input to the soil around the main pillar increases, it can be applied to hard land.

The perspective view of the foundation pile of a 1st embodiment Side view of foundation pile during placement Top view of foundation pile during placement Side view of foundation pile with resistor body starting to expand Side view of foundation pile with resistor fully expanded Plan view of foundation pile with resistor fully expanded The perspective view of the foundation pile of a 2nd embodiment Side view of foundation pile during placement Top view of foundation pile during placement Side view of foundation pile with expanded resistor Plan view of foundation pile with resistor fully expanded Side view showing an example of application to the foundation of a solar cell array mount Rear view showing an example of application to the foundation of a solar cell array mount

A first embodiment of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, the foundation pile 10 of 1st Embodiment is comprised by making the main pillar 12, the resistance member 14, and the hit | damage receiving member 16 into the principal part.

The main column 12 is a hollow square steel pipe that has been subjected to predetermined processing. The front end side is closed with a quadrangular pyramid member 17 so that it can easily penetrate into the soil, and the rear end side is open. It remains as it is. On the four side surfaces of the main pillar 12, guide holes 18 having a shape that extends long at a constant width in the entire length direction of the main pillar 12 are provided. The impact receiving member 16 is attached to the four guide holes 18.

The striking member 16 is a cross-shaped steel member having four legs 20, and the four legs 20 protrude from the inside of the main pillar 12 to the outside through the guide holes 18. The striking receiving member 16 can move in the full length direction of the main column 12 as the leg portion 20 slides along the guide hole 18.

The resistance member 14 includes a first moving body 24 on the upper end side of the main pillar 12, a second moving body 22 on the lower end side, and four resistors provided between the moving bodies 22 and 24. Both moving bodies 22 and 24 are hollow steel members having a cross-sectional shape similar to the cross-sectional shape of the main column 12, and are mounted in a state of being in surface contact with the outer peripheral surface of the main column 12. Can move while sliding in the direction.

The second moving body 22 is provided with a slide hole 28 having a shape extending long in the full length direction of the main pillar 12. The second moving body 22 is fastened to the main pillar 12 by a pin 30 fixed to the main pillar 12 through the slide hole 28, and can move by a distance corresponding to the length of the slide hole 28.

The upper portion of the first moving body 24 is engaged with the leg portion 20 of the impact receiving member 16, and an impact load is applied to the impact receiving member 16 by the impact member 100 inserted from the rear end of the main pillar 12. To the front end side of the main pillar 12.

The resistor is a plate-shaped steel member in which a first resistor 26 and a second resistor 27 are connected by a hinge 32. Both resistors 26 and 27 have the same width as both moving bodies 22 and 24 and are connected to both moving bodies 22 and 24 by hinges 34 and 36, respectively. The resistor can be bent at three locations connected by hinges 32, 34, and 36, and deformed into an isosceles triangular truss shape with the base between the two moving bodies 22, 24. Both resistors 26 and 27 are provided with ribs 38 for preventing deformation due to earth pressure during bending.

The main pillar 12 is provided with a bending guide portion 40 for guiding the bending directions of the resistors 26 and 27 in a predetermined direction. The bending guide part 40 is a triangular plate-like body, the side on the rear end side of the main pillar 12 is gently inclined, and the side on the front end side is steeper than that. The bending guide portions 40 are provided in a state where two bending guide portions 40 are arranged side by side on each side surface of the main pillar 12. A hole 42 for inserting the bending guiding portion 40 is provided in the second resistor 27. When the entire bending guide portion 40 is inserted into the hole 42, the first resistor 26 and the second resistor 27 are in a state of extending straight along the side surface of the main pillar 12. This state is when the projected area in the placement direction of the foundation pile 10 is the smallest. At the time of placement, the foundation pile 10 is placed in this state and driven into the ground. When a load is applied to the impact receiving member 16, a lateral force acts on the second resistor 27 along the hypotenuse of the bending guide portion 40, and the second resistor 27 is bent in a direction extending to the side of the main column 12. Be guided.

As shown in FIGS. 2 and 3, the foundation pile 10 is driven into the ground in a state where the projected area in the placing direction is minimized. In this state, the resistance member 14 is such that the lower end of the slide hole 28 hits the pin 30, the entire bending guide portion 40 is inserted into the hole 42, and the first resistor 26 and the second resistor 27 are connected to the side surface of the main pillar 12. It is in a state extending straight along. The foundation pile 10 is driven into the ground until it reaches a predetermined depth while applying an impact load F1 to the rear end portion of the main column 12 using a striker or the like.

When the foundation pile 10 reaches a predetermined depth, the driving operation is stopped, and the impact member 100 is inserted into the hollow portion from the rear end side of the main column 12 as shown in FIG. The impact load F <b> 2 is transmitted to the resistance member 14 through the impact receiving member 16 and is first used for guiding the resistance bodies 26 and 27 in the bending direction, and thereafter used as a driving force for expanding the resistance bodies 26 and 27. . When the impact load F <b> 2 is transmitted to the resistance member 14, the resistance member 14 moves toward the distal end side of the main column 12 by a distance S <b> 1 corresponding to the length of the slide hole 28. At that time, the bending guide portion 40 interferes with the edge portion of the hole 42, and the portion connected by the hinge 32 is guided to bend in the direction P <b> 1 away from the main column 12. As a result, the resistance member 14 bends at three locations connected by the hinges 32, 34, and 36, and is deformed into an isosceles truss shape with the base between the two moving bodies 22 and 24.

Thereafter, as shown in FIG. 5, the impact load F3 applied to the striking member 100 is used for the movement of the first moving body 24, and as a result, the distance between the first moving body 24 and the second moving body 22. , The resistors 26 and 27 are further bent and expanded laterally. Both the resistors 26 and 27 are shortened according to the moving distance S2 of the first moving body 24, and the bending angle of both the resistors 26 and 27 is increased accordingly, and the projected area in the placing direction of the foundation pile 10 is increased. Will increase. When both the resistors 26 and 27 expand, the wedges are just driven into the surrounding soil, so that the surrounding earth pressure increases, the resistance against the pulling out of the foundation pile 10 further increases, and in addition to the settlement Resistance also increases. FIG. 6 shows a state where both the resistors 26 and 27 are expanded to the maximum extent, that is, a state where the projected area in the placing direction of the foundation pile 10 is maximized.

A second embodiment of the present invention will be described with reference to FIGS. The foundation pile 50 of 2nd Embodiment has the structure which attached the resistance part and the drive part to the main pillar which forms the whole frame | skeleton.

The main column 52 is obtained by cutting a part of a hollow round steel pipe and connecting a square steel pipe 54 to the part. The length of the diagonal line of the cross section of the square steel pipe 54 is smaller than the diameter of the cross section of the round steel pipe and is large enough to fit completely inside the cross section of the round steel pipe. Therefore, reinforcing ribs 56 are attached to the four corners of the square steel pipe 54. The front end side of the round steel pipe is closed by a conical member 57 so as to easily penetrate into the ground, and the rear end side is left open for operation of the drive unit. A ball screw 58 is attached inside the square steel pipe 54. The ball screw 58 is made of two axially continuous ball screws having opposite thread cutting directions. A hexagonal head 60 is formed at one end of the ball screw 58 and is connected to a wrench 62 inserted from the rear end of the round steel pipe 52 so that a rotational driving force can be applied to the ball screw 58.

Nuts 64 and 66 are mounted on the two ball screws, respectively, and flat members (first moving body 68 and second moving body 70) are attached to the nuts 64 and 66, respectively. The first moving body 66 and the second moving body 70 are provided with portions that protrude from the guide holes 72 formed on the four side surfaces of the square steel pipe 54, respectively. And the second resistor 76 are connected.

The first resistor 74 and the second resistor 76 are a set of plate-shaped steel members connected by a hinge 78, and are provided in pairs corresponding to the four side surfaces of the square steel pipe 54. . The first resistor 74 and the first moving body 68 are connected by a hinge 80, and the second resistor 76 and the second moving body 70 are connected by a hinge 82. Both resistors 74 and 76 can be bent at three places connected by hinges 78, 80 and 82. When the distance between the two moving bodies 68 and 70 is reduced, the distance between the two moving bodies 68 and 70 is reduced. It transforms into an isosceles triangular truss shape as the base. In order to facilitate the initial operation of this deformation, bending guide portions 84 for bending the hinge 78 in advance are formed on the four side surfaces of the square steel pipe 58, respectively. Both resistors 74 and 76 are provided with reinforcing ribs 86 for preventing deformation due to earth pressure.

As shown in FIGS. 8 and 9, the foundation pile 50 is driven into the ground using a striker or the like in a state where the projected area in the placing direction is minimized. When reaching a predetermined depth, the driving operation is stopped, and a wrench 62 is inserted from the rear end side as shown in FIG. The ball screw 58 is rotated by this rotational driving force, and the first moving body 68 and the second moving body 70 attached to the nuts 64 and 66 are moved in directions close to each other, thereby reducing the distance. Along with this, the first moving body 66 and the second moving body 70 are deformed into a truss shape, and the hinge 78 portion is expanded to the side with the head at the head. The connecting portion of the two ball screws is provided with flat portions 86 and 88 having no threads, and when the nuts 64 and 66 reach this portion, the ball screw 58 is idled and the reaction transmitted to the wrench 62 Disappears. At this time, the first moving body 68 and the second moving body 70 are expanded to the maximum, and the projected area in the placing direction of the foundation pile 50 is maximized as shown in FIG.

The foundation pile 10 and the foundation pile 50 have various uses, and can be suitably used particularly as a foundation for civil engineering structures and buildings. For example, as shown in FIG. 7 and FIG. 8, there is an application as a base of a mount 104 for the solar cell array 102. A photovoltaic power generation module 106 is laid in a grid on the gantry 104. The installation angle of the gantry 104 is set in consideration of the direction of solar light irradiating the solar power generation module 106, the direction of wind, and the like. Since it is normally installed facing south, the foundation pile 10 on the south side is attached to the beam 108 on the south side of the gantry 104, and the foundation pile 10 on the north side is connected to the beam on the north side of the gantry 104 via a truss beam 110 of a predetermined length. 112 is attached.

Conventionally, when constructing a mega solar power plant, a concrete foundation was manufactured on a leveled site, and a stand for a solar cell array was installed on it. Not only was it time consuming and time consuming, but the mega solar power plant required a large amount of concrete, so the material cost was very high. Replacing foundation concrete with foundation piles can shorten the construction period and reduce construction costs. However, foundation piles were required to have resistance to pulling out against lift due to wind pressure. The foundation pile 10 is a simple structure that realizes the pulling resistance required in such a case, and it is also possible to adjust the resistance according to the hardness of the ground to be constructed. There is also an advantage of not choosing.

DESCRIPTION OF SYMBOLS 10, 50 Foundation pile 12, 52 Main pillar 16 Impact receiving member 24, 68 1st moving body 22, 70 2nd moving body 26, 64 1st resistance body 27, 76 2nd resistance body 58 Ball screw 64 66 nuts

Claims (3)

A main pillar having a hollow portion;
A resistance portion provided on the side of the main pillar so as to be expandable ;
A drive unit provided movably in the tip direction of the main pillar;
A first resistor located on the rear end side of the main pillar, and a second resistor located on the front end side of the main pillar and bendably coupled to the first resistor. With
The drive unit includes a first moving body that is bendably connected to the first resistor, and a second moving body that is bendably connected to the second resistor.
Foundation pile. Due to the external force applied to the inside of the main pillar, the first moving body relatively moves toward the front end side of the main pillar, and the second moving body moves relatively toward the front end side of the main pillar. Move small,
The foundation pile according to claim 1. A bending guiding portion for guiding the first resistor and the second resistor to bend in a predetermined direction when the second moving body moves relatively small toward the distal end side of the main pillar; Prepared,
The foundation pile according to claim 2.

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