JP2015068061A - Anchor pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor pile capable of restraining reduction in bearing force by a shear load.SOLUTION: An anchor pile 1 comprises an anchor member 3 buried in the ground from the tip side and an extension rod 5 connecting one end part to a rear end part of the anchor member 3, in which the anchor member 3 is buried in the ground by rotating the other end part of the extension rod 5 connected to the anchor member 3 around the axis of the extension rod 5 by an auger 9. The anchor member 3 comprises a first excavation blade 32 formed in a spiral shape toward the axial direction and a head part 34 for installing the extension rod 5. The extension rod 5 comprises a second excavation blade 53 formed in a spiral shape toward the axial direction and a connection part 51 connected to the head part 3. The head part 34 and the connection part 51 are connected in a state of loosely fitting one to the other, and engage with each other by rotation of the auger 9, thereby transmitting driving force of the auger 9 to the first excavation blade 32.

Description

  The present invention relates to an anchor pile provided with an anchor member embedded in the ground from the front end side and an extension rod having one end connected to the rear end of the anchor member.

  An anchor pile may be used as a foundation for supporting a building such as a solar power generation facility or a branch line of a utility pole. This anchor pile has a drilling blade formed in a spiral shape in the axial direction and is driven into the ground from the tip side. A rotating machine such as an auger is attached to the other end of the anchor pile, and the anchor pile is driven into the ground from the tip side by rotating the anchor pile around the axis.

  The ground into which such anchor piles are driven varies in hardness depending on the location, and even if the same anchor pile is driven to the same depth, the support force of the anchor pile driven in varies depending on the hardness of the ground. 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 anchor piles are driven into a soft ground with an N value of 4 or less, in order to ensure a supporting force equivalent to an anchor pile driven into a non-soft ground with an N value of 5 or more, the total length is It is necessary to bury the anchor pile to a deeper point using a longer anchor pile. However, the longer the overall length of the integrated anchor pile, the more difficult it is to manufacture and transport.

  For this reason, the anchor pile provided with another member which can extend the full length of an anchor pile is proposed (for example, refer to patent documents 1 grade). The anchor pile described in Patent Document 1 includes an anchor member embedded in the ground from the front end side, and an extension rod that can be connected to the rear end portion of the anchor member. The anchor member has a drilling blade formed in a spiral shape in the axial direction, and a head provided at the rear end, and a screw hole is formed in the head. The extension rod has a threaded portion at one end and a head at the other end. In the anchor pile described in Patent Document 1, for example, in the case of a soft ground having an N value of 4 or less, first, the screw portion of the extension rod is screwed into the screw hole of the anchor member, and the anchor member and the extension rod are integrated. The overall length is increased by connecting them together. Next, an anchor member can be embedded to a deeper point in the ground by attaching a rotary machine to the head of the extension rod and rotating the extension rod around the axis by the rotary machine. Thus, according to the anchor pile described in Patent Literature 1, for example, even when the anchor pile is driven into a soft ground having an N value of 4 or less, the extension rod is connected to the anchor member. The anchor member can be buried to a deeper point. As a result, it is not necessary to use an integrated anchor pile having a long overall length that is relatively difficult to manufacture and transport.

JP 2000-1850 A

  Here, when a shear load (load in the direction intersecting the axial direction) is applied to the rear end of the anchor pile driven into the ground, the stress in the direction intersecting the axial direction is transmitted to the tip side of the anchor pile. Is done. The stress transmitted to the tip side of the anchor pile becomes larger as the total length of the anchor pile becomes longer. In the anchor pile described in Patent Document 1, when a shear load is applied to the head of the extension rod, the stress is transmitted to the tip side of the anchor member, and the tip side portion of the anchor member moves to disturb the ground. May end up. As a result, there is a risk that the support force of the anchor pile will be weakened.

  An object of this invention is to provide the anchor pile which can suppress the fall of the supporting force by a shear load in view of the said situation.

The anchor pile of the present invention that solves the above object includes an anchor member embedded in the ground from the front end side, and an extension rod having one end connected to the rear end of the anchor member, and connected to the anchor member. In the anchor pile in which the anchor member is embedded in the ground by rotating the other end of the extension rod around the axis of the extension rod by rotating means,
The anchor member has a first excavation blade formed in a spiral shape in the axial direction,
The extension rod has a second excavation blade formed in a spiral shape in the axial direction,
The rear end portion and the one end portion are connected in a state in which one is loosely fitted to the other, and the rotation means rotates so that they are engaged with each other, and the driving force of the rotation means is applied to the first excavation blade. It is characterized by what it conveys.

  According to the anchor pile of the present invention, since the head and the connecting portion are connected in a state in which one is loosely fitted to the other, when a shear load is applied to the extension rod, Stress in the direction intersecting the axial direction is difficult to be transmitted to the anchor member. Furthermore, since the extension rod has the second excavating blade formed in a spiral shape in the axial direction, the extension rod itself moves when a shear load is applied to the extension rod. Can be suppressed. As a result, even when a shear load is applied to the extension rod, the anchor member is difficult to move and the ground is less likely to be disturbed, and a decrease in the supporting force of the anchor pile can be suppressed. In addition, the head and the connecting portion are engaged with each other when the rotating means rotates, and the driving force of the rotating means can be transmitted to the first excavating blade. That is, the connection structure of the head and the connection part is a structure that releases the stress in the direction intersecting the axial direction while transmitting the driving force of the rotating means.

  Here, a plurality of the first excavating blades may be provided at intervals in the axial direction, and the plurality of first excavating blades may be arranged from the front end side of the anchor member to the rear end. The diameter may gradually increase toward the side. Further, the second excavation blade may have a diameter equal to or larger than the maximum diameter of the first excavation blade.

  Further, the anchor member may be driven into the ground by the rotation means being attached to the head and rotating around the axis by the rotation means. The anchor member may be driven into a prepared hole formed on a hard ground such as a rock by a prepared hole tool having a carbide tip or the like.

  Further, one end of another extension rod is connected to the other end of the extension rod, a rotation means is attached to the other end of the other extension rod, and the other extension rod is rotated around the axis by the rotation means. Thus, the anchor member may be embedded in the ground. Two or more other extension rods may be connected.

Further, in the anchor pile of the present invention, the rear end portion is a prismatic shape in which a first through hole penetrating in an orthogonal direction orthogonal to the axial direction is formed.
The one end portion has a recess capable of accommodating the rear end portion, and a second through hole penetrating in the orthogonal direction is formed.
A retaining member that penetrates both the first through hole and the second through hole may be provided.

  By doing so, the connecting structure between the head and the connecting portion can be simplified. In addition, since the anchor member is provided, the anchor member is prevented from coming off the extension rod when the anchor pile is attached to the rotating means or when the anchor pile is pulled out from the ground. Can do.

  Furthermore, in the anchor pile according to the present invention, it is preferable that the second excavation blade is formed at the connecting portion.

  In this way, in the state where the anchor member is buried in the ground, the connecting portion of the extension rod becomes stable and more difficult to move, and when a shear load is applied to the extension rod, the axial direction The stress in the direction that intersects with the anchor member is more difficult to transmit to the anchor member.

  ADVANTAGE OF THE INVENTION According to this invention, the anchor pile which can suppress the fall of the supporting force by a shear load can be provided.

(A) is a figure which decomposes | disassembles and shows the anchor pile which is embodiment of this invention, (b) is the figure which looked at the extension rod shown to (a) from the downward direction. (A) is a figure which shows a mode that a rotation means is attached to the anchor pile of the state shown to Fig.1 (a) in which the anchor member and the extension rod were connected, (b) is AA of (a). It is sectional drawing. (A) is a figure for demonstrating the combination of an anchor member and a connection rod, (b) is a figure for demonstrating the aspect using a some extension rod.

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

  Fig.1 (a) is a figure which decomposes | disassembles and shows the anchor pile which is embodiment of this invention.

  The anchor pile 1 is driven into the ground and supports structures such as solar power generation facilities, branch lines of utility poles, and the like. In particular, the anchor pile 1 is suitably used when it is necessary to drive to a deep point on a soft ground having an N value of 4 or less.

  As shown in FIG. 1A, the anchor pile 1 includes an anchor member 3 and an extension rod 5. In FIG. 4A, the vertical direction is the axial direction of each of the anchor member 3 and the extension rod 5.

  The anchor member 3 is integrally manufactured by casting or the like. In FIG. 1A, the lower end of the anchor member 3 is the tip of the anchor member 3, and the upper end of the anchor member 3 is the anchor member 3. Become the trailing edge. As shown to Fig.1 (a), the anchor member 3 has the axial part 31, the collar part 33, and the head part 34 formed in order of description from the front-end | tip to the rear end. A plurality of first excavation blades 32 are formed on the shaft portion 31. The shaft portion 31 has a substantially conical shape whose diameter increases slightly from the front end toward the rear end, and a drill portion 311 is formed at the front end portion. Each of the plurality of first excavation blades 32 is formed in a spiral shape in the axial direction. In the present embodiment, four first excavation blades 32 are formed, and the plurality of first excavation blades 32 are formed in substantially half of the distal end side of the shaft portion 31 with a predetermined interval in the axial direction. Yes. The plurality of first excavation blades 32 are formed such that the diameter gradually increases from the first excavation blade 32 formed on the most distal side to the first excavation blade 32 formed on the most rear end side. The diameter of the first excavation blade 32 formed on the rear end side is the maximum. A plurality of first excavation blades 32 may be continuous in the axial direction to form one first excavation blade 32, and one or a plurality of first excavation blades 32 are formed in the entire axial direction of the shaft portion 31. May be formed.

  The flange portion 33 has a disk shape and is formed at the rear end portion of the shaft portion 31. The head portion 34 has a quadrangular prism shape and is formed in a state extending from the flange portion 33 to the rear end side. The head 34 is formed with a head through hole 34a that penetrates in a direction orthogonal to the axial direction. The head through hole 34a is formed as a long hole extending in the axial direction. Hereinafter, a direction orthogonal to the axial direction may be referred to as an orthogonal direction. The head 34 is not limited to a quadrangular prism shape, but may be a triangular prism shape or a pentagonal prism shape or more. Further, the flange portion 33 may be a polygonal plate-shaped member, and the anchor member 3 may not have the flange portion 33. In addition, the anchor member 3 of this embodiment can be used alone as an anchor pile without connecting the extension rod 5. For example, the anchor member 3 may be used as an anchor pile driven into a ground having an N value of 5 or more. In a hard ground such as a rock, a prepared hole formed by a tool for a prepared hole having a carbide tip or the like. You may use it as an anchor pile to drive.

  Similarly to the anchor member 3, the extension rod 5 is also integrally manufactured by casting or the like. In the extension rod 5 of FIG. 1A, the lower end portion corresponds to one end portion in the present invention, and the upper end portion corresponds to the other end portion in the present invention.

  As shown in FIG. 1A, the extension rod 5 includes a connecting portion 51, a columnar portion 52, a second flange portion 54, and a second head portion 55 formed in the order of description from one end to the other end. Have. A second excavation blade 53 is formed in the connecting portion 51.

  FIG.1 (b) is the figure which looked at the extension rod 5 shown to the figure (a) from the downward direction. As shown in FIGS. 1A and 1B, the connecting portion 51 constitutes one end portion of the extension rod 5, and is formed with a recessed portion 511 and a second recessed portion 512 opened to one end side. ing. The recess 511 is formed with a rectangular parallelepiped space that is slightly larger than the outer shape of the head 34 in the anchor member 3, and accommodates the head 34 of the anchor member 3. The second recess 512 is formed with a disk-shaped space that is slightly larger than the outer shape of the flange 33 in the anchor member 3, and accommodates the flange 33 of the anchor member 3. Further, the connection portion 51 is formed with a pair of connection through holes 51a that penetrates in the orthogonal direction.

  The second excavating blade 53 is formed on one end side of the connecting portion 51 with respect to the portion where the connecting through hole 51a is formed. The second excavation blade 53 is formed in a spiral shape in the axial direction, and is the largest diameter formed on the most rear end side among the plurality of first excavation blades 32 of the anchor member 3. The first digging blade 32 has a diameter larger than that of the first digging blade 32.

  The columnar part 52 is a columnar part extending in the axial direction from the connecting part 51. The second flange portion 54 is formed on the other end side of the columnar portion 52, and the second head portion 55 extends from the second flange portion 54 to the other end side. The second head 55 is formed with a second head through hole 55a that penetrates in the orthogonal direction. In the present embodiment, the second flange portion 54 is formed in substantially the same shape as the flange portion 33 of the anchor member 3, and the second head portion 55 is formed in substantially the same shape as the head portion 34 of the anchor member 3. .

  The anchor member 3 and the extension rod 5 are connected in a state where the head 34 of the anchor member 3 is accommodated in the recess 511 of the extension rod 5 and the flange 34 of the anchor member 3 is accommodated in the second recess 512 of the extension rod 5. Is done. As described above, the recess 511 is formed with a space that is slightly larger than the outer shape of the head 34. For this reason, when the head 34 is accommodated in the recess 511, a gap is generated between the head 34 and the recess 511, and the head 34 is loosely fitted in the recess 511. In addition, since the second recessed portion 512 is formed with a space that is slightly larger than the outer shape of the flange portion 33, when the flange portion 33 is accommodated in the second recess portion 512, the flange portion 33 and the second recess portion 512. There is also a gap between them. The connection structure between the head 34 and the recess 511 will be described in detail later. Next, the anchor bolt 71 is passed through both the head through hole 34a and the connecting through hole 51a, and the retaining nut 72 is attached to the retaining bolt 71, whereby the anchor member 3 is prevented from coming off from the extension rod 5. The That is, the retaining bolt 71 corresponds to the retaining member referred to in the present invention.

  2, the anchor member 3 is buried in the ground by rotating the second head portion 55 (the other end portion) of the extension rod 5 connected to the anchor member 3 around the axis of the extension rod 5 by the rotating means. An aspect is demonstrated.

  Fig.2 (a) is a figure which shows a mode that a rotation means is attached to the anchor pile of the state shown to Fig.1 (a) in which the anchor member and the extension rod were connected. FIG.2 (b) is AA sectional drawing of the figure (a). In FIG. 4A, the vertical direction is the axial direction, and in FIG. 4B, the direction orthogonal to the paper surface is the axial direction.

  As shown to Fig.2 (a), the anchor pile 1 has the 2nd head 55 of the extension rod 5 attached to the auger 9, such as a construction pillar car. The auger 9 corresponds to the rotating means referred to in the present invention, and has a cylindrical shape in which an opening 9a opened in a rectangular shape is formed on the lower end side. In the lower end side portion of the auger 9, a pair of auger through holes 9b penetrating in the orthogonal direction is formed. In order to attach the anchor pile 1 to the auger 9, first, the second head 55 of the extension rod 5 is inserted into the opening 9 a of the auger 9. Next, the mounting bolt 91 is inserted into both the auger through hole 9b and the second head through hole 55a, and the mounting nut 92 is attached to the mounting bolt 91 so that the second head 55 of the extension rod 5 is attached to the auger 9. It is done. Note that the extension rod 5 may be attached to the auger 9 before the anchor member 3 and the extension rod 5 are connected, and the anchor member 3 may be connected to the extension rod 5 attached to the auger 9.

  After the anchor pile 1 is attached to the auger 9, the anchor rod 1 is driven into the ground by rotating the extension rod 5 with the auger 9, and the anchor member 3 is buried in the ground. The anchor pile 1 is driven until, for example, the upper surface of the second flange portion 54 of the extension rod 5 becomes the same height as the ground. The anchor pile 1 driven into the ground is supported by the second head 55 and the second brim part 54, for example, a frame of solar power generation equipment, or the second head 55 supports a utility pole. A branch line or the like is attached. According to the anchor pile 1 of the present embodiment, the anchor member 3 can be buried to a deep point by connecting the extension rod 5. As a result, more earth pressure is applied to the first excavating blade 32, and the anchor pile 1 can be provided with sufficient supporting force even in a soft ground having an N value of 4 or less. Moreover, since the anchor pile 1 is formed by connecting the anchor member 3 and the extension rod 5, it is easier to manufacture and transport the anchor pile compared to the case where the anchor pile is manufactured integrally. As a method of driving the anchor pile 1 into the ground, only the anchor member 3 may be driven into the ground before the extension rod 5 and the anchor member 3 are connected. Specifically, first, the anchor member 3 is driven into the ground by attaching the anchor member 3 to the head 34 of the anchor member 3 and rotating the anchor member 3 around the axis by the auger 9. Next, after removing the auger 9 from the anchor member 3 and connecting the extension rod 5 to the driven anchor member 3, the auger 9 is attached to the second head 55 of the extension rod 5 and the anchor pile 1 is driven into the ground. You can also.

  Next, the connection structure between the head 34 of the anchor member 3 and the recess 511 of the extension rod 5 will be described in detail with reference to FIG. Until the extension rod 5 rotates around the axis by the auger 9, the head 34 is connected in a loosely fitted state with respect to the recess 511, and the recess 511 of the connecting portion 51 indicated by a solid line in FIG. There is a gap C between the head 34. In FIG. 2B, for convenience of explanation, the head 34 is located at the center of the recess 511, and a gap C generated at substantially the same interval around the head 34 is shown. In many cases, the center position shifts from the center of the recess 511 and the gap C formed around the head 34 is non-uniform. When the extension rod 51 is rotated around the axis by the auger 9 (see the clockwise arrow in the figure), the concave portion 511 of the connecting portion 51 comes into contact with the outer periphery of the head portion 34 and is connected to the head portion 34 as shown by a one-dot chain line. Part 51 is engaged. When the driving of the auger 9 is continued with the head portion 34 and the connecting portion 51 engaged, the anchor member 3 rotates with the rotation of the extension rod 5, and the driving force of the auger 9 is transmitted to the first excavation blade 32. While the pile 1 is driven into the ground, the anchor member 3 is buried in the ground from the drill portion 311 at the tip.

  When the auger 9 is removed from the second head 55 of the extension rod 5 after the anchor pile 1 is driven, the driving force of the auger 9 applied to the extension rod 5 is released. When the driving force of the auger 9 is released, the engagement between the head portion 34 and the connecting portion 51 is also released, and the head portion 34 and the connecting portion 51 return to the loosely fitted state. For this reason, even if a shear load is applied to the second head 55 of the anchor pile 1 driven into the ground, the stress in the direction crossing the axial direction is caused by the connecting structure of the head 34 and the recess 511. It is difficult to be transmitted to the anchor member 3 from That is, the connection structure of the head part 34 and the connection part 51 is a structure in which the driving force of the auger 9 is transmitted and stress in the direction intersecting the axial direction is released. Thereby, even if a shear load is applied to the second head 55 or the like, the anchor member 3 becomes difficult to move, so that the ground around the anchor member 3 is less likely to be disturbed. Can be suppressed. Further, since the second excavation blade 53 is formed in the connecting portion 51, the extension rod 5 is difficult to move even when a shear load is applied to the second head 55 and the like, and as a result, the anchor member 3 is also difficult to move. Thus, the decrease in the supporting force of the anchor pile 1 is further suppressed. Moreover, when the extension rod 5 becomes difficult to move, the structure etc. which are supported by the anchor pile 1 can also be stabilized. The second excavating blade 53 may be formed on the support column 52 of the extension rod 5, but is preferably formed on the connecting portion 51 in order to make the extension rod 5 difficult to move. Further, the connecting portion 51 is formed with a recess 511 and has a larger diameter than the support portion 52. For this reason, when driving the anchor pile 1 into the ground, the resistance applied to the connecting portion 51 is larger than that of the support portion 52. In this embodiment, since the 2nd excavation blade 53 is formed in the connection part 51, the connection part 51 from which resistance becomes large can be embed | buried smoothly in the ground. In addition, it is more preferable that the second excavation blade 53 is formed on one end side of the connecting portion 51 with respect to the connecting through hole 51a.

  The anchor pile 1 can adjust the embedding depth of the anchor member 3 by using extension rods having different lengths of the columnar portions 52 and anchor members 3 having different lengths. FIG. 3A is a view for explaining a combination of an anchor member and a connecting rod.

  As shown in FIG. 3A, the extension rod includes the extension rod 5 described above, the extension rod 5 ′ whose columnar portion 52 is shorter than the extension rod 5, and the length of the columnar portion 52. Is provided with a long extension rod 5 ″. In the extension rod 5 ′, the second excavation blade 53 is formed in the columnar portion 52. Further, in the extension rod 5 ″, in addition to the second excavation blade 53 formed in the connecting portion 51, a second excavation blade 53 having a diameter larger than that of the second excavation blade 53 is formed in the columnar portion 52. . The anchor member 3 is prepared with the anchor member 3 described above and an anchor member 3 ′ in which the length of the shaft portion 31 is longer than that of the anchor member 3. An anchor member is embedded by combining an extension rod selected from the three extension rods 5, 5 ′, 5 ″ and an anchor member selected from the two anchor members 3, 3 ′ according to the hardness of the ground. The depth can be adjusted.

  Moreover, the anchor pile 1 can adjust the embedding depth of the anchor member 3 by connecting a plurality of extension rods. FIG. 3B is a view for explaining an embodiment using a plurality of extension rods.

  As shown in FIG. 3B, the connecting portion 51 of the extension rod 5 is connected to the head portion 34 of the anchor pile 3, and the connecting portion 51 of another extension rod 5 is connected to the second head portion 55 of the extension rod 5. May be connected. Thus, the anchor pile 3 can be embed | buried to a deeper point by connecting the extension rod 5 with two or more. Moreover, since the 2nd head 55 of the extension rod 5 is formed in the substantially the same shape as the head 34 of the anchor pile 3 as mentioned above, it is different from the 2nd head 55 of the extension rod 5, and another extension rod. The connection structure with the five connection portions 51 is also loosely fitted in the same manner as the connection structure between the head portion 34 and the connection portion 51 shown in FIG. As a result, when a shear load is applied to the second head portion 55 of the extension rod 5 connected to the extension rod 5, the connecting structure between the second head portion 55 and the connecting portion 51 also extends in the direction intersecting the axial direction. Stress can be released. For this reason, in both the connection structure of the head part 34 and the connection part 51 and the connection structure of the second head part 55 and the connection part 51, stress in the direction intersecting the axial direction can be released, and the anchor pile 3 In addition, the stress in the direction intersecting the axial direction becomes more difficult to be transmitted, and it becomes possible to further suppress the decrease in the supporting force of the anchor pile 3 due to the shearing force. Note that the extension rod 5 ′ and the extension rod 5 ″ shown in FIG. 3A may be used as the extension rod connected to the extension rod 5.

  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 connecting portion 51 of the extension rod 5 has the second recess 512 that accommodates the flange portion 33 of the anchor member 3, but the connecting portion 51 does not have the second recess 512. The whole of the head 34 or a part of the head 34 may be accommodated by the recess 511.

  In addition, even if it is a structural requirement contained only in each description of each modification demonstrated above, you may apply the structural requirement to another modification.

Further, the anchor member embedded in the ground from the front end side, and an extension rod having one end connected to the rear end of the anchor member, the rotating means is connected to the other end of the extension rod connected to the anchor member. An anchor pile in which the anchor member is embedded in the ground by attaching and rotating the extension rod around the axis by the rotating means,
The anchor member has a first excavation blade formed in a spiral shape in the axial direction, and a head to which the extension rod is attached.
The extension rod has a connecting portion connected to the head,
The head and the connecting portion are connected in a state in which one of them is loosely fitted to the other, and the rotating means rotates so that they engage with each other and transmit the driving force of the rotating means to the first excavation blade. It may be a thing.

DESCRIPTION OF SYMBOLS 1 Anchor pile 3 Anchor member 31 1st excavation blade 34 Head 34a Head through-hole 5 Extension rod 51 Connection part 511 Recessed part 51a Connection through-hole 53 2nd excavation blade 71 Stop bolt 9 Auger

Claims (3)

An anchor member embedded in the ground from the front end side and an extension rod having one end connected to the rear end of the anchor member, and the other end of the extension rod connected to the anchor member is extended by the rotating means. An anchor pile in which the anchor member is embedded in the ground by rotating around the axis of the rod,
The anchor member has a first excavation blade formed in a spiral shape in the axial direction, and a head to which the extension rod is attached.
The extension rod has a second excavating blade formed in a spiral shape in the axial direction, and a connecting portion connected to the head.
The head and the connecting portion are connected in a state in which one of them is loosely fitted to the other, and the rotating means rotates so that they engage with each other and transmit the driving force of the rotating means to the first excavation blade. Anchor pile characterized by being a thing. The head is a prismatic shape in which a head through-hole penetrating in an orthogonal direction orthogonal to the axial direction is formed,
The connecting portion has a recess capable of accommodating the head, and a connecting through hole penetrating in the orthogonal direction is formed.
The anchor pile according to claim 1, further comprising a retaining member that penetrates both the head through hole and the connection through hole.   The anchor pile according to claim 1 or 2, wherein the second excavation blade is formed in the connecting portion.

Images