JP2015068063A - Anchor pile, building foundation structure, and construction method of building foundation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor pile that is devised to enhance shearing performance, while suppressing an increase of weight.SOLUTION: An anchor pile 1 is buried in the ground from a lower end by rotating about a shaft center, and having an upper end side connected to a supporting member for supporting a building. The anchor pile includes: a buried part 11 buried in the ground; a head 13 provided above the buried part 11; an excavation blade 14 helically provided toward the shaft center direction along which the shaft center extends, on the lower end side of the buried part 11; and a resistance blade 15 helically provided toward the shaft center direction between the excavation blade 14 and the head 13. The resistance blade 15 includes cutout parts 151 that are cut out to the side of the buried part 11 at intervals in the helical revolving direction, and an attitude stabilizing part 152 sandwiched between the cutout parts 151 adjacent to each other in the revolving direction.

Description

  The present invention relates to an anchor pile embedded in the ground from the lower end by rotating around an axis, a building foundation structure including a plurality of anchor piles embedded in the ground, and an anchor pile embedded in the ground. The present invention relates to a method for constructing a building foundation structure including a plurality of structures.

  An anchor pile may be used for the foundation of a building that supports a building such as a photovoltaic power generation facility. This anchor pile has a drilling blade formed in a spiral shape in the axial direction in which the axis extends, and is known to be driven into the ground from the tip side (for example, Patent Document 1). Etc.). The anchor pile described in Patent Document 1 has a buried part buried in the ground, a head provided above the buried part, and a brim provided between the buried part and the head. ing. Further, the buried portion is provided with a plurality of excavation blades formed in a spiral shape in the axial direction at intervals in the axial direction.

  The ground where anchor piles are buried varies in hardness depending on the location, and even if the same anchor pile is buried to the same depth, the ability of the anchor piles buried by the ground softness to resist the tensile load The ability to resist compressive loads and the ability to resist shear loads are different. Hereinafter, the ability to resist tensile load may be referred to as tensile performance, the ability to resist compressive load may be referred to as compression performance, and the ability to resist shear load may be referred to as shear performance. Here, the N value is often used as an index representing the degree of softness of the ground. As shown in JIS A1219, the N value is obtained from the resistance of the ground generated when a predetermined measuring tool (sampler) is driven into the ground. Specifically, a hammer having a mass of 63.5 kg (about 622.3 N) from a height of 75 cm is freely dropped onto a hollow measuring instrument having an outer diameter of 5.1 cm, an inner diameter of 3.5 cm, and a length of 81.0 cm. It is obtained from the number N of hits required to drive the measuring tool 30 cm into the ground. The N value is such that the softer the ground, the smaller the value. For example, in the case of clay soil, when the N value is 4 or less, it is generally said that the ground is soft. When anchoring an anchor pile on soft ground such as N value of 4 or less, in order to ensure the same tensile performance as an anchor pile embedded in non-soft ground such as N value of 5 or more, It is necessary to bury the anchor pile to a deeper point using a longer anchor pile. However, when the total length is increased, the number of excavating blades is increased, the weight is increased, and transportation and handling are difficult. Further, when the anchor pile is manufactured integrally by casting or the like, the manufacture is often difficult.

  Here, the anchor pile which provides a digging blade only in the front end side part in an embedding part is proposed (for example, refer patent documents 2 grade). In the anchor pile described in Patent Document 2, the embedded portion has a front end portion and a rear end portion, and a spiral excavation blade is provided only at the front end portion. According to the anchor pile described in Patent Document 2, it is possible to secure a supporting force by increasing the overall length even when buried in soft ground, and further, a drilling blade is provided at the rear end portion. Therefore, an increase in weight can be suppressed.

Special table 2004-520505 gazette JP-A-10-183617

  However, in the anchor pile described in Patent Document 2, since the excavating blade is not provided in the rear end side portion, the shear load (direction intersecting the axial direction is applied to the head of the anchor pile embedded in the ground. Shear performance is low when a load is applied. For this reason, especially when the ground in which the anchor pile is buried is softer, when a shear load is applied to the head of the anchor pile due to an earthquake, a wind, or the like, the anchor pile is more easily inclined.

  In view of the above circumstances, the present invention is an anchor pile that has been devised to increase shear performance while suppressing an increase in weight, a building foundation structure that can stably support a building by increasing the shear performance of the anchor pile, and An object of the present invention is to provide a construction method of a building foundation structure that can enhance the shear performance of the anchor pile and stably support the building.

The anchor pile of the present invention that solves the above object is embedded in the ground from the lower end by rotating around the axis, and is an anchor pile whose upper end side is connected to a support member that supports a building. ,
A buried part buried in the ground,
A head provided above the buried portion;
On the lower end side of the buried portion, a drilling blade spirally provided toward the axial direction in which the axial center extends,
Between the excavation blade and the head, and having a resistance blade spirally provided toward the axial direction,
The resistance blade has a notch portion notched on the embedded portion side with an interval in a spiral circumferential direction, and a posture stabilizing portion sandwiched between the notch portions adjacent to each other in the circumferential direction. It is characterized by that.

  Here, a plurality of the excavating blades may be provided at intervals in the axial direction. When a plurality of the excavating blades are provided, the resistance blade is provided between the excavating blade provided on the uppermost side and the head among the plural excavating blades. The resistance blade may be provided between the excavating blade and the head at a position where a maximum moment is generated when a shear load is applied to the head. Furthermore, the intervals in the circumferential direction of the plurality of cutout portions may all be the same or different. Still further, two posture stabilizing portions may be provided in postures that are opposite to each other about the axis.

  According to the anchor pile of the present invention, since the resistance blade has the posture stabilizing portion, the posture stabilizing portion can improve the shear performance. For this reason, even if the ground in which the anchor pile is buried is soft, when the shear load is applied to the head, the inclination of the anchor pile can be suppressed. Furthermore, since the said resistance blade | wing has the said notch part, the increase in a weight can be suppressed by this notch part. Furthermore, when the anchor pile rotates, the cutouts make it easier for pebbles such as pebbles and gravel to escape, and the rotation of the anchor pile is less likely to be hindered by the gravel.

  Moreover, the anchor pile of this invention WHEREIN: The said attitude | position stabilization part may be arrange | positioned at a 90 degree space | interval in the spiral surrounding direction.

  Here, each of the posture stabilizing portions may be one in which all or a part thereof overlaps with another posture stabilizing portion when viewed in the axial direction.

  For example, when a plurality of the anchor piles are arranged in a straight line and a building is supported by these anchor piles, the head of each anchor pile has a direction in which a plurality of anchor piles are arranged and orthogonal to this direction. The shear load applied to the direction of the movement tends to increase. If the posture stabilizing portion is arranged at intervals of 90 degrees in the spiral circumferential direction, the posture stabilizing portion can be arranged in a posture facing a direction in which a large shear load is applied, and the anchor pile is more inclined. It can be suppressed efficiently. In addition, by adopting an aspect in which the posture stabilizing portion is arranged at intervals of 90 degrees in the spiral circumferential direction, the shear performance can be obtained regardless of the direction from which shear load is applied to the head. It becomes easy to improve.

Furthermore, in the anchor pile of the present invention, the posture stabilizing portion is an arc shape whose outer peripheral edge is convex in a direction away from the embedded portion,
The cutout portion may be cut out in an arc shape convex toward the embedded portion.

  If the posture stabilizing portion has an arc shape whose outer peripheral edge is convex in a direction away from the embedded portion, the wedge effect by the posture stabilizing portion increases, and the anchor pile has a tensile performance and a compression performance. It becomes easy to improve. Moreover, if the said notch part shall be notched in the circular arc shape which becomes convex toward the said embedment part, when rotating the said anchor pile, it will be hard to disturb the ground. For this reason, the fall of the tensile performance and compression performance of an anchor pile by the ground being disturbed can be suppressed.

Moreover, it is provided between the embedded portion and the head, and has a long flange portion in a predetermined direction orthogonal to the axis.
The aspect which has the 1st attitude | position stability part which faced the longitudinal direction of the said collar part, and the 2nd attitude | position stabilization part which faced the width direction of this collar part may be sufficient as the said attitude | position stabilization part.

  Here, the collar portion may be rectangular, oval or elliptical.

  By doing so, the direction in which each of the first posture stabilizing portion and the second posture stabilizing portion faces can be understood by looking at the collar portion, and in the operation of burying the anchor pile, the first posture stabilizing portion and the first posture stabilizing portion. It becomes easy to orient each of the two posture stabilizing portions in a desired direction.

The building foundation structure of the present invention that solves the above-described object is provided with a plurality of anchors whose upper end side is connected to a support member that supports the building in a state where it is buried in the ground from the lower end by rotating about an axis. In the building foundation structure with piles,
The anchor pile is
A buried part buried in the ground,
A head provided above the buried portion;
On the lower end side of the buried portion, a drilling blade spirally provided toward the axial direction in which the axial center extends,
Between the excavation blade and the head, and having a resistance blade spirally provided toward the axial direction,
The resistance blade includes a notch portion that is notched toward the embedded portion with an interval in a spiral circumferential direction, and a posture stabilizing portion that is sandwiched between the notch portions adjacent to each other in the circumferential direction. ,
The posture stabilizing portions are arranged at intervals of 90 degrees in a spiral circumferential direction,
The plurality of anchor piles are embedded in the ground at intervals in a posture in which posture stabilizing portions of the resistance blades face each other.

  Here, the plurality of anchor piles may be embedded at positions spaced linearly, or may be embedded at the position of each vertex of the rectangle, It may be embedded in a lattice shape in plan view.

  Here, for example, when the plurality of anchor piles are embedded at positions spaced linearly, the anchor piles are arranged in the direction in which the plurality of anchor piles are arranged. The shear load applied in the direction orthogonal to the direction tends to increase. In addition, when the plurality of anchor piles are embedded at the positions of the respective rectangular vertices or embedded at the grid-like positions, each anchor pile is connected to another anchor pile. The shear load applied in the opposite direction tends to increase. According to the building foundation structure of the present invention, the posture stabilizing portions are arranged at intervals of 90 degrees in the spiral circumferential direction, and the plurality of anchor piles are configured to stabilize the posture of the resistance blades of each other. It is buried in the ground with a gap in the posture where the parts face each other. For this reason, the said attitude | position stable part can be made into the attitude | position which faces the direction where a big shear load is easy to apply to each anchor pile. Thereby, the shear performance of each anchor pile improves, and a building can be supported stably.

The construction method of a building foundation structure according to the present invention that solves the above object comprises at least a first anchor pile and a second anchor pile as the plurality of anchor piles. In the construction method,
A burying position setting step for setting a first burying position for burying the first anchor pile and a second burying position for burying the second anchor pile;
A first embedding step of embedding the first anchor pile at the first embedding position by rotating the first anchor pile; and rotating the second anchor pile, the second anchor pile. Having a second burying step of burying a pile at the second burying position;
The first embedding step is a step of completing the rotation of the first anchor pile in a posture in which the posture stabilizing portion in the first anchor pile faces the second buried position,
The second embedding step is a step in which the rotation of the second anchor pile is completed in a posture in which the posture stabilizing portion in the second anchor pile faces the first buried position. To do.

  According to the construction method of the building foundation structure of the present invention, the shear performance of each anchor pile is improved, and the building foundation structure capable of stably supporting the building can be constructed.

  ADVANTAGE OF THE INVENTION According to this invention, the anchor pile by which the device which raised the shear performance was suppressed, suppressing the increase in weight, the shear performance of the anchor pile, the building foundation structure which can support a building stably, and an anchor pile of It is possible to provide a method for constructing a building foundation structure that can enhance the shear performance and stably support the building.

It is a figure which shows the state by which the anchor pile of embodiment of this invention was embed | buried in the ground. (A) is AA sectional drawing of the anchor pile shown in FIG. 1, (b) is the figure which looked at the anchor pile shown in FIG. 1 from upper direction. (A) is BB sectional drawing of the anchor pile shown in FIG. 1, (b) is a figure which expands and shows the C section enclosed with the ellipse of the anchor pile shown in FIG. It is the figure which looked at the building basic structure of this invention from the upper direction. (A) is a top view which shows the state by which the supporting member was connected with the anchor pile shown in FIG. 4, (b) was the figure which looked at (a) from the side. It is a figure which shows the aspect by which the support | pillar of the building was supported by the support member connected with the anchor pile of the building foundation structure shown in FIG. It is the figure which looked at FIG. 6 from the left in the 2nd protrusion direction. It is a top view of a building foundation structure when a plurality of support structures are arranged. It is a flowchart which shows the construction method of the building foundation structure which is embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  Drawing 1 is a figure showing the state where the anchor pile of the embodiment of the present invention was buried in the ground.

  The anchor pile 1 is embedded in the ground from the lower end by rotating around the axis, and the upper end side is connected to a support member that supports a building such as a solar power generation facility. In particular, the anchor pile 1 is suitably used when buried in soft ground having an N value of 4 or less. In FIG. 1, the vertical direction is the direction in which the axis of the anchor pile 1 extends, and the direction in which the axis extends is hereinafter referred to as the axis direction. In FIG. 1, the axis of the anchor pile 1 is indicated by a two-dot chain line.

  As shown in FIG. 1, the anchor pile 1 has a buried portion 11 buried in the ground and a head 13 provided above the buried portion 11, and is located between the buried portion 11 and the head 13. The heel part 12 is provided. The burying portion 11 has a first burying portion 111 at the lower end side portion, and has a second burying portion 112 between the first burying portion 111 and the flange portion 12. The 1st embedding part 111 has drill part 111a provided with the cutting blade in the lower end part. The second embedded portion 112 has a larger diameter than the first embedded portion 112, and a plurality of meat stealing portions 112a recessed along the axial direction are formed. The buried portion 11 may not be divided into the first buried portion and the second buried portion, and may be a spindle-shaped one whose diameter gradually increases from the lower end side toward the upper end side. Good.

  The first embedded portion 111 is provided with a plurality of excavating blades 14 at intervals in the axial direction. The second embedded portion 112 is provided with one excavation blade 14 at the lower end side portion thereof.

  Fig.2 (a) is AA sectional drawing of the anchor pile shown in FIG.

  As shown in FIG. 1 and FIG. 2A, the excavation blade 14 provided in the second embedded portion 112 is provided in a spiral shape in the axial direction, and has a spiral blade on the outer peripheral edge. 14a. Further, the upper end portion of the excavating blade 14 in the spiral shape is formed with an upper end edge 14b of the excavating blade extending radially from the axial center, and the lower end portion of the excavating blade 14 in the spiral shape is formed with the lower end edge 14c of the excavating blade. Has been. As shown in FIG. 2A, when viewed in the axial direction from the upper end side, the excavating blade 14 is provided in a spiral shape from the upper end edge 14b of the excavating blade toward the lower end side in the axial direction. The edge 14c is located slightly beyond the upper edge 14b of the digging blade, and a part of the lower end side of the digging blade 14 is hidden. The excavation blade 14 provided in the first burying portion 111 has the same shape, but the excavation blade 14 provided in the second embedment portion 112 from the excavation blade 14 provided on the lowermost side in the first embedment portion 111. The outer shape gradually becomes larger. That is, the outer shape of the excavating blade 14 provided in the second embedded portion 112 located at the uppermost end among the plural excavating blades 14 is the largest. These excavation blades 14 may be continuous to form one excavation blade. Of the plural excavation blades 14 arranged in the axial direction, the outer shapes of some of the excavation blades 14 adjacent to each other in the axial direction. The size may be the same. Hereinafter, when it is necessary to distinguish the excavation blade 14 located on the uppermost side from the other excavation blades 14, the excavation blade 14 located on the uppermost side may be referred to as an upper-end excavation blade 14 ′. .

  As shown in FIG. 1, the resistance blade 15 is provided in the 2nd embedding part 112 at the upper end side rather than the upper end side excavation blade 14 '. That is, the resistance blade 15 is provided between the excavation blade 14 and the head 13. In the present embodiment, the resistance blade 15 is provided at a position slightly closer to the upper end side in the portion of the second embedded portion 112 on the upper end side than the upper end side excavation blade 14 ′. The position where the resistance blade 15 of the present embodiment is provided is a shear which is a load perpendicular to the axial direction on the head 13 when the anchor pile 1 is embedded in a soft ground having an N value of about 2 to 4. When the load is applied, the second embedded portion 112 is set at a position where the maximum moment is generated in the upper end side portion of the upper end side excavation blade 14 '.

  3A is a cross-sectional view taken along the line BB of the anchor pile shown in FIG. 1, and FIG. 3B is an enlarged view of a portion C of the anchor pile shown in FIG. 1 surrounded by an ellipse. is there. In FIG. 3A, the upper-side excavation blade 14 'is omitted to simplify the drawing.

  As shown in FIGS. 3A and 3B, the resistance blade 15 is provided in a spiral shape in the axial direction. A resistance blade upper edge 15b extending radially from the axial center is formed at the upper end portion of the resistance blade 15 in a spiral shape, and a resistance blade lower edge 15c is formed at the lower end portion of the resistance blade 15 in a spiral shape. Has been. As shown in FIG. 3A, when viewed in the axial direction from the upper end side, the resistance blade 15 is spirally provided from the upper end edge 15b of the resistance blade toward the lower end side in the axial direction. The edge 15c is positioned slightly beyond the resistance blade upper edge 15b, and a part of the lower end side of the resistance blade 15 is hidden.

  In addition, the resistance blade 15 is formed on the outer peripheral portion thereof at a notch portion 151 that is notched toward the second embedded portion 112 with an interval in the spiral circumferential direction, and a notch portion 151 that is adjacent to the spiral circumferential direction. It has a sandwiched posture stabilizing part 152. This posture stabilizing portion 152 can improve the shear performance of the anchor pile 1, and when the ground on which the anchor pile 1 is embedded is soft, when the shear load is applied to the head 13, the anchor pile 1 The inclination of can be suppressed. Further, the notch 151 can suppress an increase in the weight of the anchor pile 1. Furthermore, as will be described later, when the anchor pile 1 is rotated and buried in the ground, the notch 151 makes it easy to escape pebbles such as pebbles and gravel, and the rotation of the anchor pile 1 is less likely to be hindered by the gravel.

  In the present embodiment, the plurality of posture stabilizing units 152 are arranged at intervals of 90 degrees in the spiral rotating direction, although the interval in the spiral rotating direction in the posture stabilizing unit 152 is not particularly limited. As a result, as indicated by the arrows in FIG. 3A, the posture stabilizing unit 152 is provided in a shape facing upward, downward, rightward and leftward in FIG. On the other hand, it protrudes in the direction orthogonal to each other. That is, the resistance blade 15 includes a plurality of posture stabilizing portions 152 that are oriented in directions orthogonal to each other. Hereinafter, the direction in which each posture stabilizing unit 152 protrudes with respect to the axis may be referred to as a protruding direction. Since the plurality of posture stabilizing portions 152 are arranged at intervals of 90 degrees in the spiral circumferential direction, the anchor pile 1 of the anchor pile 1 can be used even if a shear load is applied to the head 13 from any direction. It becomes easy to improve shear performance. As will be described later, when a plurality of anchor piles 1 are embedded in a straight line and a building is supported by these anchor piles 1, a plurality of anchor piles 1 are provided on the head 13 of each anchor pile 1. The shear load applied to the lined direction and the direction orthogonal to this direction tends to increase. By adopting a mode in which the plurality of posture stabilizing portions 152 are arranged at intervals of 90 degrees in the spiral circumferential direction, the direction in which a large shear load is applied and the protruding direction of the plurality of posture stabilizing portions 152 are made to coincide with each other. The pile 1 can be arranged. Thereby, it becomes possible to suppress the inclination of the anchor pile 1 more efficiently. In FIG. 3 (a), two posture stabilizing portions 152 with the protruding direction facing the right side are provided on the top and bottom as shown in FIG. 3 (b).

  Further, the posture stabilizing portion 152 is an arc shape whose outer peripheral edge 152 a is convex in a direction away from the second embedded portion 112. For this reason, the wedge effect by the attitude | position stabilization part 152 goes up, and it becomes easy to improve the tension | pulling performance and the compression performance of the anchor pile 1. FIG. Further, the notch 151 is notched in an arc shape that is convex toward the second embedded portion 112. For this reason, when rotating the anchor pile 1, it becomes difficult to disturb the ground, and the deterioration of the tensile performance and the compression performance of the anchor pile 1 due to the ground being disturbed can be suppressed. Note that, as shown in FIG. 3B, the thickness of the outer peripheral edge 152 a of the posture stabilizing portion 152 is thinner than that of the notch portion 151.

  In the present embodiment, the length in the protruding direction of the resistance blade 15 (from the outer peripheral edge 152a of the posture stabilizing unit 152 to the outer peripheral edge 152a of the posture stabilizing unit 152 provided on the opposite side of the posture stabilizing unit 152 with the axis therebetween. Is set to be approximately the same as the diameter of the outer peripheral edge of the upper end side excavation blade 14 ′ (see FIG. 2B). The length of the resistance blade 15 in the protruding direction may be smaller or larger than the diameter of the outer peripheral edge of the upper end side excavation blade 14 ′.

  FIG.2 (b) is the figure which looked at the anchor pile shown in FIG. 1 from upper direction. In FIG. 2B, the ground GL is indicated by hatching, and the protruding direction is indicated by a double-dashed double arrow.

  As shown in FIG. 1 and FIG. 2 (b), the collar unit 12 has a collar unit upper surface 12 a exposed to the ground. Further, as shown in FIG. 2 (b), the collar portion 12 has an oval shape in plan view that is long in one protruding direction. For this reason, one protruding direction is the longitudinal direction of the flange 12, and the other protruding direction is the width direction of the flange 12. That is, the posture stabilizing portion 152 facing the longitudinal direction of the collar portion 12 corresponds to the first posture stabilizing portion according to the present invention, and the protruding direction of the first posture stabilizing portion coincides with the longitudinal direction of the collar portion 12. Is. In addition, the posture stabilizing unit 152 facing the width direction of the collar portion 12 corresponds to the second posture stabilizing portion according to the present invention, and the protruding direction of the second posture stabilizing portion coincides with the width direction of the collar portion 12. Is. Note that the collar portion 12 is not limited to an oblong shape in plan view, and may be any shape having a longitudinal direction and a width direction in plan view, such as a rectangular shape in plan view or an elliptical shape in plan view. In the anchor pile 1 of this embodiment, the protruding direction of the posture stabilizing part 152 can be recognized by the longitudinal direction and the width direction of the flange part 12. For this reason, in the process of burying the embedded portion 11 in the ground while rotating the anchor pile 1, the anchor pile 1 is in a posture in which the protruding direction of the posture stabilizing portion 152 is in a desired direction by checking the flange upper surface 12a. Can be completed. Hereinafter, of the projecting directions, a direction coinciding with the longitudinal direction of the flange portion 12 may be referred to as a first projecting direction, and a projecting direction orthogonal to the first projecting direction may be referred to as a second projecting direction.

  The head 13 is formed in a solid prismatic shape, and as shown in FIG. 1, a head long hole 13a extending in the vertical direction is formed. As shown in FIG. 2B, the head long hole 13a is formed so as to penetrate in the second protruding direction. Further, the head long hole 13 a has a lateral width that decreases toward the center of the head 13.

  As shown in FIG. 1, the head 13 is formed with a head screw hole 13b penetrating in the vertical direction from the upper surface to the head long hole 13a and having a screw cut on the inner peripheral surface. A restriction member 131 made of a hexagon bolt is attached to the head screw hole 13b. The restricting member 131 is movable up and down with respect to the head 13, and by moving up and down, the position of the lower end thereof moves up and down within the head long hole 13 a. FIG. 1 shows a state in which the lower end of the regulating member 131 is slightly projected into the head long hole 13a. The restricting member 131 may be a bolt or a screw other than a hexagon bolt, or may be a screw without a head such as a hollow set. Further, a lock nut may be disposed between the bolt head and the head 13 of the regulating member 131.

  Next, the building foundation structure 10 of the present invention will be described.

  FIG. 4 is a view of the building foundation structure of the present invention as viewed from above. In addition, in FIG. 4, in order to simplify drawing, the upper end side excavation blade of each anchor pile 1 is abbreviate | omitted.

  As shown in FIG. 4, the building foundation structure 10 includes a plurality of the anchor piles 1 described above. Each of these anchor piles 1 is embedded in the ground with a space between each other. In the present embodiment, the building foundation structure 10 including two anchor piles 1 will be described as an example. However, the building foundation structure 10 may include three or more anchor piles 1.

  In FIG. 4, the protruding direction of each anchor pile 1 is indicated by a two-dot chain double arrow. These anchor piles 1 are arranged in a posture in which the respective second protruding directions coincide. Thereby, in the anchor pile 1, each one of the posture stabilizing portions 152 facing the second protruding direction is in a state of facing each other. That is, the plurality of anchor piles 1 are embedded in the ground at intervals in a posture in which the posture stabilizing portions 152 of the resistance blades 15 face each other.

  Next, an aspect in which an anchor pile is connected to a support member that supports a building will be described. In the following description, a mode in which the support member is connected to one anchor pile 1 in the building foundation structure 10 shown in FIG. 4 will be described, but the mode in which the support member is connected to the other anchor pile 1 is also the same. is there. Further, in the present embodiment, a description will be given by taking as an example an aspect of supporting a building column.

  Fig.5 (a) is a top view which shows the state with which the supporting member was connected with the anchor pile shown in FIG. 4, FIG.5 (b) is the figure which looked at the same figure (a) from the side. 5A and 5B, the left-right direction is the second protruding direction. In FIG. 5A, the vertical direction is the first protruding direction, and in FIG. 5B, the direction orthogonal to the paper surface is the first protruding direction.

  As shown in FIG. 5A and FIG. 5B, the support member 3 is connected to the head 13 which is the upper end side of the anchor pile 1 by the connecting member 5. The connecting member 5 includes a connecting bolt 51 and a connecting nut 52. The support member 3 includes an angle 33, a main body 31 on which the angle 33 is placed, and a plurality of adjustment members 32 that are attached to the main body 31 and are disposed on the heel surface 12 a of the anchor pile 1. In FIG. 5A, the ground and the angle 33 are omitted for the sake of simplicity.

  As shown in FIG. 5 (b), the angle 33 includes a horizontal piece 331 on which a pillar of a building, which will be described later, is placed, and one end side of the horizontal piece 331 in the first protruding direction (in FIG. 5 (b)). It has a vertical piece 332 that rises from a portion on the back side of the drawing. The horizontal piece 331 is formed with a horizontal piece long hole 331a extending in the second protruding direction at both end portions in the second protruding direction. Further, the vertical piece 332 is formed with two vertical piece holes 332a at a substantially central portion in the second projecting direction with an interval in the vertical direction. The adjustment member 32 has an adjustment bolt 321 and a lock nut 322.

  The main body 31 is formed by bending a rectangular plate material, and includes a bottom plate portion 311, a pair of vertical plate portions 312 rising from both end portions in the second protruding direction of the bottom plate portion 311, and a pair of Each of the vertical plate portions 312 has a flange portion 313 formed so as to protrude outward in the second protruding direction. As shown to Fig.5 (a), the rectangular shaped opening 311a which the head 13 of the anchor pile 1 penetrates is formed in the center part in the 1st protrusion direction in the baseplate part 311. As shown in FIG. The main body 31 is arranged in a state where the head 13 of the anchor pile 1 penetrates through the opening 311a. As shown in FIG. 5B, the bottom plate portion 311 is formed with a screw hole 311 b for attaching the adjustment member 32. Two screw holes 311b are formed outside the head 13 of the anchor pile 1 in the first protruding direction. The adjustment bolts 321 of the adjustment member 32 are respectively attached to these screw holes 311b. The adjustment bolt 321 is fastened to the bottom plate portion 311 by a lock nut 322 with the bolt head protruding downward from the bottom plate portion 311 by a predetermined dimension. The adjustment bolt 321 maintains a predetermined distance between the flange upper surface 12a and the bottom plate portion 311 by the bolt head contacting the flange upper surface 12a. By adjusting these adjusting members 32, the height position of the main body 31 with respect to the collar upper surface 12a can be adjusted. Moreover, the main body 31 can also be made into the inclination attitude | position with respect to the collar upper surface 12a by adjusting these adjustment members 32 separately.

  As shown in FIG. 5 (b), a pair of vertical plate portions 312 are formed with connecting member holes 312 a, respectively. The connecting bolt 51 is inserted into the connecting member hole 312 a and the head long hole 13 a formed in the head 13 of the anchor pile 1, and the connecting nut 52 is attached to the connecting bolt 51. 1 are connected.

  As described above, since the head long hole 13a is formed as a long hole extending in the vertical direction, the inserted connecting bolt 51 can move in the vertical direction. For this reason, when the distance between the collar part 12 and the bottom plate part 311 is adjusted by the adjusting member 32 and the height and inclination of the main body 31 with respect to the collar upper surface 12a are changed, the connection bolt 51 inserted into the head long hole 13a The position moves up and down. After the adjustment by the adjusting member 32 is completed, as shown in FIG. 5B, the connecting bolt 51 is moved upward by moving the regulating member 131 downward until the lower end of the restricting member 131 comes into contact with the connecting bolt 51 from above. Movement in the direction can be restricted. Thereby, the movement to the up-down direction of the support member 3 is controlled with respect to the anchor pile 1, and the rattling of the support member 3 is suppressed. As a result, rattling of the building supported by the support member 3 can be suppressed.

  As shown in FIG. 5A, the flange portion 313 is formed with a flange portion long hole 313a extending in the first protruding direction. As shown in FIG. 5B, the angle 33 is mounted on the flange portion 313, and the angle 33 is fixed to the flange portion 313 by the fastening member 34 inserted through the horizontal piece long hole 331a and the flange portion long hole 313a. Yes. As described above, the horizontal piece long hole 331a is formed as a long hole extending in the second protruding direction, and the flange portion long hole 313a is formed as a long hole extending in the first protruding direction. The position of 33 can be moved in the second protruding direction and the first protruding direction, respectively.

  Next, a mode in which the building is supported by the support member 3 connected to the anchor pile 1 of the building foundation structure will be described.

  FIG. 6 is a view showing a mode in which the support column of the building is supported by the support member connected to the anchor pile of the building foundation structure shown in FIG. 4. In FIG. 6, the left-right direction is the second protruding direction, and the direction orthogonal to the paper surface is the first protruding direction. FIG. 6 is a view as seen from the first protruding direction. FIG. 7 is a view of FIG. 6 viewed from the left side in the second protruding direction. In FIG. 7, the left-right direction is the first protruding direction, and the direction perpendicular to the paper surface is the second protruding direction.

  As shown in FIGS. 6 and 7, a column 71 made of C-type steel is fixed to the angle 33, and a horizontal member 72 made of C-type steel is fixed to the column 71. The column 71 extends in the vertical direction, and the lower end thereof is placed on the horizontal piece 331 of the angle 33, and the lower part is in contact with the vertical piece 332 of the angle 33. The horizontal member 72 extends in the second protruding direction, and both end portions are fixed to the upper portion of the angle 33. The length in the vertical direction of the support 71 and the length in the extending direction of the horizontal member 72 can be arbitrarily set according to the size of the building to be supported. In FIG. 6, an intermediate portion in the vertical direction of the support 71 and an intermediate portion in the extending direction of the horizontal member 72 are omitted. As shown in FIG. 7, in the lower part of the column 71, column holes 71a are formed at positions corresponding to the two vertical piece holes 332a. The second fastening member 73 is inserted into the vertical piece hole 332a and the column hole 71a, and the angle 33 and the column 71 are fixed by the second fastening member 73. Further, one support hole 71 a is formed in the upper part of the support 71, and a horizontal material hole 72 a corresponding to the support hole 71 a formed in the upper part of the support 71 is formed in the horizontal member 72. The second fastening member 73 is also inserted into the support hole 71 a and the horizontal member hole 72 a, and the support 71 and the horizontal member 72 are fixed by the second fastening member 73.

  The structure of the building foundation structure 10, the support member 3, the connecting member 5, the support 71, and the horizontal member 72 including the plurality of anchor piles 1 shown in FIGS. 6 and 7 is hereinafter referred to as a support structure 100. The number of anchor piles in the support structure 100 is not limited to two, and one or more anchor piles 1 are buried below the intermediate portion in the extending direction of the horizontal member 72 and supported by the anchor piles 1. It is good also as an aspect which supports the 3 or more support | pillar 71 fixed to the one horizontal member 72 by connecting the member 3. FIG. Furthermore, although the support structure 100 may be used alone, a plurality of support structures 100 may be arranged in parallel to each other with a gap in the first protruding direction. When two support structures 100 are arranged in parallel with each other at intervals in the first projecting direction, the anchor piles 1 in the building foundation structure 10 have rectangular vertices in plan view. Buried in position.

  In addition, a plurality of support structures 100 may be arranged side by side in the second projecting direction, and a plurality of support structures 100 may be arranged in the second projecting direction and arranged in the first projecting direction at intervals.

  FIG. 8 is a plan view of a building foundation structure when a plurality of support structures are arranged. In FIG. 8, the left-right direction is the second protruding direction, and the up-down direction is the first protruding direction.

  When a plurality of support structures 100 are arranged in each of the second protruding direction and the first protruding direction, the anchor piles 1 are arranged in a lattice shape indicated by a two-dot chain line as shown in FIG.

  For example, a panel frame or the like of a solar power generation facility (not shown) is supported on the horizontal member 72 by the one or more support structures 100 described above. When a panel frame or the like is supported on the support structure 100, the head 13 of each anchor pile 1 has a second projecting direction and a second protrusion, regardless of whether the support structure 100 is one or more. 1. A large shear load is applied in the protruding direction. As described above, each anchor pile 1 is one in which the posture stabilizing portion 152 is embedded in the ground in a posture facing the first protruding direction and the second protruding direction. For this reason, the building foundation structure 10 of this embodiment improves the shear performance of the anchor pile 1 and can stably support a building such as a photovoltaic power generation facility.

  Next, a construction method of the building foundation structure will be described.

  FIG. 9 is a flowchart showing a construction method for a building foundation structure according to an embodiment of the present invention. The construction method of the building foundation structure of the present invention is a method of constructing the building foundation structure 10 shown in FIG. 4 using the anchor pile 1 shown in FIGS.

  As shown in FIG. 9, in the construction method of a building foundation structure, first, an anchor pile preparation process for preparing the anchor pile 1 shown in FIGS. 1 to 3 is performed (step S1). In the anchor pile preparation step, at least two anchor piles 1 are prepared. In the following description, one of these two anchor piles 1 may be referred to as a first anchor pile 1, and the other of these two anchor piles 1 may be referred to as a second anchor pile 1. These anchor piles 1 may be prepared by being manufactured integrally by casting, or may be prepared by obtaining the manufactured anchor piles 1.

  Subsequently, the embedding position setting process which sets the 1st embedding position which embeds the 1st anchor pile 1 and the 2nd embedding position which embeds the 2nd anchor pile 1 is implemented (step S2). In the embedded position setting step, the first embedded position and the second embedded position are set according to the size of the building to be supported, the installation direction, and the like.

  Then, the 1st embedding process which embeds the 1st anchor pile 1 in the 1st embedding position by rotating the 1st anchor pile 1 is carried out (Step S3). In the first embedding process, after the head 13 of the first anchor pile 1 is attached to an auger or the like of a building column car, the first anchor pile 1 is grounded by rotating the first anchor pile 1 with the auger. Buried inside. Further, in the first burying step, the first anchor pile 1 is confirmed with the flange 12 and when the width direction of the flange 12 coincides with the direction connecting the first embedded position and the second embedded position, The rotation of one anchor pile 1 is completed. By carrying out like this, the 2nd protrusion direction of the 1st anchor pile 1 and the direction which connects a 1st embedding position and a 2nd embedding position can be made to correspond. That is, the first embedding step is a step in which the rotation of the first anchor pile 1 is completed in a posture in which the posture stabilizing unit 152 in the first anchor pile 1 faces the second embedding position.

  Next, a second burying step of burying the second anchor pile 1 at the second burying position is performed by rotating the second anchor pile 1 (step S4). In the second burying step, the second anchor pile 1 is buried in the ground in the same manner as in the first burying step. In the second embedding process, the anchor 12 of the second anchor pile 1 is confirmed, and when the width direction of the anchor 12 coincides with the direction connecting the first embedding position and the second embedding position, The rotation of one anchor pile 1 is completed. By carrying out like this, the 2nd protrusion direction of the 2nd anchor pile 1 and the direction which connects a 1st embedding position and a 2nd embedding position can be made to correspond. That is, the second embedding step is a step in which the rotation of the second anchor pile 1 is completed in a posture in which the posture stabilizing portion 152 in the second anchor pile 1 faces the first embedding position.

  Moreover, in the construction method of the building foundation structure of the present invention, an anchor pile having a circular flange may be used, but as shown in FIG. 2 (b), the flange 12 having a longitudinal direction and a width direction. By using the anchor pile 1 provided with the above, the protruding direction of the posture stabilizing unit 152 can be understood by looking at the flange portion 12, and the operation for completing the rotation with the posture in which the protruding direction of the posture stabilizing unit 152 is directed to the desired direction is easy. become. Further, in the first burying step and the second burying step, the rotation of the anchor pile 1 may be completed when the longitudinal direction of the flange portion 12 coincides with the direction connecting the first burying position and the second burying position. Good.

  As shown in FIG. 8, when constructing a building foundation structure 10 composed of three or more anchor piles 1, after performing the anchor pile preparation process for preparing the necessary number of anchor piles 1, the respective anchors are prepared. An embedding position setting process is performed in which the embedding position of the pile 1 is set to a position that is rectangular or latticed. Then, the embedding process which completes rotation with the attitude | position in which each 2nd protrusion direction or 1st protrusion direction corresponds of each anchor pile 1 should just be implemented.

  By implementing the above process, the building foundation structure 10 shown in FIG. 4 can be constructed. In addition, after connecting the supporting member 3 shown in FIG. 5 to the head 13 of each anchor pile 1 in the constructed building foundation structure 10, the support 71 and the horizontal member 72 shown in FIGS. 6 and 7 are fixed. By doing so, the support structure 100 can be constructed.

  As explained above, according to the anchor pile of this embodiment, shear performance can be improved while suppressing an increase in weight. Moreover, according to the building foundation structure of this embodiment, the shear performance of an anchor pile can be improved and a building can be supported stably. Furthermore, according to the construction method of the building foundation structure of this embodiment, it is possible to construct a building foundation structure that can enhance the shear performance of the anchor pile and stably support the building.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims. For example, in the present embodiment, the support column 71 of the building is supported by the support member 3, but a mode in which a horizontally extending gantry member connecting the lower ends of a plurality of support columns is supported by the support member may be employed. .

DESCRIPTION OF SYMBOLS 1 Anchor pile 10 Foundation structure 100 Support structure 11 Embedding part 12 Anchor part 13 Head 14 Excavation blade 15 Resistance blade 151 Notch part 152 Posture stabilization part 152a Outer periphery 3 Support member 31 Main body 32 Adjustment member 33 Angle 5 Connecting member 71 Post 72 Horizontal material

Claims (6)

In the anchor pile that is buried in the ground from the lower end by rotating around the axis, and the upper end side is connected to the support member that supports the building,
A buried part buried in the ground,
A head provided above the buried portion;
On the lower end side of the buried portion, a drilling blade spirally provided toward the axial direction in which the axial center extends,
Between the excavation blade and the head, and having a resistance blade spirally provided toward the axial direction,
The resistance blade has a notch portion notched on the embedded portion side with an interval in a spiral circumferential direction, and a posture stabilizing portion sandwiched between the notch portions adjacent to each other in the circumferential direction. Anchor pile characterized by that.   2. The anchor pile anchor pile according to claim 1, wherein the posture stabilizing portions are arranged at intervals of 90 degrees in a spiral circumferential direction. 3. The posture stabilizing portion is an arc shape whose outer peripheral edge is convex in a direction away from the embedded portion,
The anchor pile according to claim 1 or 2, wherein the cutout portion is cut out in an arc shape protruding toward the embedded portion. Provided between the embedded portion and the head, and having a long flange portion in a predetermined direction orthogonal to the axis;
4. The apparatus according to claim 1, wherein the posture stabilizing portion includes a first posture stabilizing portion facing the longitudinal direction of the collar portion and a second posture stabilizing portion facing the width direction of the collar portion. Anchor pile according to any one of them. In a building foundation structure with a plurality of anchor piles whose upper end side is connected to a support member that supports the building in a state where it is buried in the ground from the lower end by rotating around the axis,
The anchor pile is
A buried part buried in the ground,
A head provided above the buried portion;
On the lower end side of the buried portion, a drilling blade spirally provided toward the axial direction in which the axial center extends,
Between the excavation blade and the head, and having a resistance blade spirally provided toward the axial direction,
The resistance blade includes a notch portion that is notched toward the embedded portion with an interval in a spiral circumferential direction, and a posture stabilizing portion that is sandwiched between the notch portions adjacent to each other in the circumferential direction. ,
The posture stabilizing portions are arranged at intervals of 90 degrees in a spiral circumferential direction,
The plurality of anchor piles are embedded in the ground at intervals with a posture in which posture stabilizing portions of the resistance blades face each other. In the construction method of the building foundation structure according to claim 5, comprising at least a first anchor pile and a second anchor pile as the plurality of anchor piles.
A burying position setting step for setting a first burying position for burying the first anchor pile and a second burying position for burying the second anchor pile;
A first embedding step of embedding the first anchor pile at the first embedding position by rotating the first anchor pile; and rotating the second anchor pile, the second anchor pile. Having a second burying step of burying a pile at the second burying position;
The first embedding step is a step of completing the rotation of the first anchor pile in a posture in which the posture stabilizing portion in the first anchor pile faces the second buried position,
The second embedding step is a step in which the rotation of the second anchor pile is completed in a posture in which the posture stabilizing portion in the second anchor pile faces the first buried position. Construction method of building foundation structure.

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