JP2012162947A - Steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe pile for enabling a pile tip to reliably arrive at a supporting layer.SOLUTION: The steel pipe pile 10 comprises: a pile body 12; and an insert pile 14. With the pile body 12 rotated by a pile driver, a spiral blade 18 drills a ground 56 to make the pile body 12 penetrate into the ground 56. When the spiral blade 18 abuts on a hard intermediate layer located at a position shallower than the intended supporting layer to preclude the pile body 12 from penetrating thereinto, the insert pile 14 is inserted into the pile body 12 until its sharpened tip 34 abuts on the intermediate layer, and the upper end of the insert pile 14 is hammered to destroy the hard intermediate layer so that the spiral blade 18 can drill the ground 56. Then, with the pile body 12 rotated, the intermediate layer is drilled and the tip of the pile body 12 arrives at the supporting layer as a final arrival point.

Description

  The present invention relates to a steel pipe pile used for a foundation of a building.

When building a building such as a house on a weak ground, piles are driven into the ground and the foundation is constructed on it.
As the pile, various steel pipe piles having a spiral wing at the tip have been proposed (see, for example, Patent Document 1).

JP-A-01-142122.

This steel pipe pile has the purpose of facilitating penetration into the ground by providing wings, and increasing the support capacity of the pile by increasing the pile area at the tip.
The steel pipe pile construction method has been approved by the Minister of Construction in 1994 (Osaka No. 59) and is widely used.

  For example, in the case of a ground with a hard and thin intermediate layer near the penetration depth of 3.25 to 4.25 m and a stable layer with a layer thickness of 6.75 m or deeper, the intermediate layer is Instead, it is a common construction method to use a stable layer having a layer thickness of 6.75 m or more as a support layer at the tip of the pile.

  However, if rotating penetration is performed using a steel pipe pile with wings, this intermediate layer cannot be pulled out and stops, and the intended original support layer (appropriate support layer derived from ground survey or design). It may not be possible to reach the tip of the pile until the depth.

  That is, at the stage where the pile tip of the rotating steel pipe pile reached the intermediate layer, the ground is hard and the area of the tip is large, so it is impossible to rotate the steel pipe pile to a depth greater than that, The steel pipe pile cannot be driven to the intended original support layer. If the steel pipe pile is not driven up to the original support layer, there is a possibility that it may cause a subsequent malfunction.

  In addition, for the purpose of forcibly penetrating, if the steel pipe pile itself is struck and penetrated, it is necessary to increase the striking force because the penetration resistance due to the circumferential frictional force with the ground of the outer periphery of the pile is large, There is a problem that an excessive force is applied to the wing and the wing is damaged.

  In consideration of the above-described facts, the present invention has an object to provide a steel pipe pile that does not require a large striking force and that can reliably reach the target tip of the pile without damaging the blade.

  The steel pipe pile according to claim 1 has a pile body formed in a hollow shape and provided with a wing on the outer periphery on the end side in the penetration direction to the ground, and a pointed shape on the end side in the penetration direction to the ground. Striking means inserted into the main body.

Next, the effect | action of the steel pipe pile of Claim 1 is demonstrated.
In order to penetrate the pile main body into the ground, the pile main body penetrates into the ground while the ground is excavated by the wing by rotating the pile main body with a pile driving machine.

  Here, the wing provided on the front end side of the pile main body may hit a hard intermediate layer that is shallower than the original support layer, and the pile main body may not be able to penetrate due to a large resistance. In such a case, the striking means is inserted into the pile body, the pointed shape part is abutted against the intermediate layer, and the upper end of the striking means is struck so that the ground can be excavated with wings. Can be destroyed.

Thereafter, the pile body is rotated to excavate the intermediate layer, and the tip of the pile body reaches the support layer which is the final arrival point.
Since the pile body is not hit, a large hitting force is not required, and damage to the wing can be prevented.

  According to a second aspect of the present invention, in the steel pipe pile according to the first aspect, the hitting means has a tip portion having a pointed shape at the end side in the penetration direction to the ground, and is opposite to the penetration direction of the tip portion. And a shaft portion connecting means for connecting a shaft portion for addition is provided at an end portion of the shaft portion.

Next, the operation of the steel pipe pile according to claim 2 will be described.
Since the depth to the intermediate layer varies, it is necessary to increase the length of the striking means as necessary. In the steel pipe pile according to claim 2, since a part of the shaft portion connecting means for connecting the shaft portion for addition is provided at the end portion of the hitting means, the shaft portion connecting means is used for extension. It is possible to extend the length of the hitting means. Thereby, it is possible to deal with various intermediate layers having different depths.

  According to a third aspect of the present invention, in the steel pipe pile according to the second aspect, the tip portion connects a plurality of triangular plate members whose widths are narrowed toward the end in the penetration direction in a side view on the axial center side. It is formed by doing.

Next, the effect | action of the steel pipe pile of Claim 3 is demonstrated.
By connecting a plurality of triangular plate members whose widths become narrower toward the end in the penetration direction when viewed from the side, the tip having a sharp shape can be easily formed.
For example, a steel plate can be used as the plate member, and the tip portion can be easily formed by welding a steel plate cut into a triangle.

  According to a fourth aspect of the present invention, in the steel pipe pile according to any one of the first to third aspects, the maximum diameter of the striking means is set smaller than the inner diameter of the pile body.

Next, the effect | action of the steel pipe pile of Claim 4 is demonstrated.
By setting the maximum diameter of the hitting means to be smaller than the inner diameter of the pile main body, the hitting means can be inserted into the pile main body later if necessary.
For example, when only the pile main body is rotated and penetrated into the ground and the pile main body reaches a hard intermediate layer, the striking means can be inserted into the pile main body, and the hard intermediate layer can be destroyed by the striking means.

  Invention of Claim 5 is the steel pipe pile of any one of Claims 1-4. The pile main body connection means for connecting the steel pipe for extension to the edge part of the said pile main body. A part of is provided.

Next, the effect | action of the steel pipe pile of Claim 5 is demonstrated.
Since the depth to the support layer varies, it is necessary to extend the length of the pile body as necessary.
In the steel pipe pile according to claim 5, since a part of the pile body connecting means for connecting the steel pipe for addition is provided at the end of the pile body, the steel pipe for extension is used by using this pile body connecting means. Connect and extend the length of the pile body. Thereby, it is possible to cope with various support layers having different depths.

  As described above, the steel pipe pile according to claim 1 has an excellent effect that the tip of the pile can be reached easily and reliably to the target support layer.

  According to the steel pipe pile of Claim 2, it can respond to various intermediate | middle layers from which depth differs.

  According to the steel pipe pile of Claim 3, the front-end | tip part which has a sharp shape can be formed easily.

  According to the steel pipe pile of Claim 4, a hit | damage means can be inserted in a pile main body later as needed.

  According to the steel pipe pile of Claim 5, it can respond to various support layers from which depth differs.

It is a side view of the steel pipe pile concerning a 1st embodiment. It is sectional drawing of a pile main body. (A) is a perspective view of an extension shaft, (B) is a perspective view of a tip part, and (C) is a sectional view near the upper end of a steel pipe pile. It is a side view of the pile driving machine which attached the steel pipe pile. It is sectional drawing near the front-end | tip of a steel pipe pile at the time of destruction of an intermediate | middle layer. It is a perspective view of an insert pile concerning other embodiments. It is a perspective view near the front-end | tip of the steel pipe pile which concerns on 2nd Embodiment. It is sectional drawing along the axis line of the steel pipe pile which concerns on 2nd Embodiment. (A)-(C) are side views of a clutch. It is a side view of the steel pipe pile concerning a 2nd embodiment.

[First Embodiment]
The steel pipe pile 10 which concerns on one Embodiment of this invention is demonstrated according to FIG. 1 thru | or FIG.
As shown in FIG. 1, the steel pipe pile 10 of this embodiment is comprised including the hollow pile main body 12 and the insert pile 14 arrange | positioned inside the pile main body 12. As shown in FIG.

(Pile body)
The pile main body 12 can be extended in length by connecting an extension pile main body 12B for extension to a tip pile main body 12A that is a tip.

  The tip pile main body 12A is formed of a steel pipe having a circular cross section, and a spiral blade 18 made of a steel plate is joined to the outer periphery on one end side by welding or the like. In the present embodiment, two spiral blades 18 are provided on the outer periphery of the steel pipe, but may be one or three or more. The shape of the spiral blade 18 of the present embodiment is a fan shape when viewed from the axial direction, but may be another shape, and a known shape can be adopted.

  As shown in FIG. 2, the internal thread 22 for connecting the extension pile main body 12B is formed in the inner surface of the other end side of the tip pile main body 12A.

  The extension pile main body 12B is also formed of a steel pipe having a circular cross section, and a male screw 24 is formed on the outer surface on one end side, and a female screw 26 is formed on the inner surface on the other end side.

  At the other end of the tip pile main body 12A and the extension pile main body 12B, an engaging portion 30 for engaging with the motor of the pile driving machine 54 (see FIG. 4) is formed. Although the engaging portion 30 of the present embodiment is a cut, it may have another shape such as a protrusion, and a known configuration can be adopted.

(Insert pile)
As shown in FIGS. 3A and 3B, the insert pile 14 has a tip portion 34 and a shaft portion 32 constituted by a shaft 40 and an extension shaft 42.

The distal end portion 34 of the present embodiment is configured by welding a plurality of arrowhead members 38 made of a steel plate formed in a triangle to one surface of a disc 36 formed of a steel plate, and is tapered in a side view. The arrowhead member 38 is combined in a cross shape when viewed from the axial direction.
In addition, the outer diameter of the front-end | tip part 34 of this embodiment is set smaller than the internal diameter of the steel pipe pile 10. FIG.

A shaft 40 having a diameter smaller than that of the circular plate 36 is joined to the circular plate 36 of the distal end portion 34 coaxially with the circular plate 36 on the side opposite to the side to which the arrowhead member 38 is welded. Yes.
The shaft 40 is formed with a male screw 44 for connecting an extension shaft 42 for extension, which will be described later, at the end opposite to the tip portion 34.
In addition, what joined the front-end | tip part 34 and the axis | shaft 40 is called the front-end pile 45 in this embodiment.

The extension shaft 42 for extension has a female screw 46 formed on one end side and a male screw 48 formed on the other end side.
As shown in FIG. 3C, the male screw 44 side of the shaft 40 and the male screw 48 side of the extension shaft 42 are covered with a male screw 44 and a steel protective cap 50 that protects the male screw 48. it can. The protective cap 50 is formed in a cylindrical shape, and a hole 52 into which the male screws 44 and 48 can be inserted is formed on one end side. The protective cap 50 is preferably formed of steel or the like so as not to be deformed by impact, and may be hardened to increase the hardness. The protective cap 50 is preferably harder than the shaft 40 and the extension shaft 42.

Next, the lengths of the pile body 12 and the insert pile 14 will be described.
The total length L1 of the tip pile main body 12A of the pile main body 12 is formed shorter than the total length L2 (see FIG. 3A) of the tip pile 45 of the insert pile 14 to which the protective cap 50 is attached. In addition, the full length L3 (see FIG. 2) of the extension pile main body 12B excluding the male screw 24 is set to the same length as the full length L4 (see FIG. 3A) of the extension shaft 42 excluding the male screw 48. ing.

  Therefore, the steel pipe pile 10 of this embodiment inserts the insert pile 14 in the pile main body 12, as shown in FIG. 1, and the lower end of the pile main body 12 and the lower end (tip of the front-end | tip part 34) are the same. When the level is set, the upper end of the insert pile 14 to which the protective cap 50 is attached protrudes from the upper end of the pile body 12.

(Function)
Next, the construction method using the steel pipe pile 10 of this embodiment is demonstrated.
(1) As shown in FIG. 4, the pile driving machine 54 holds only the tip pile main body 12 </ b> A, and the pile driving machine 54 rotates and penetrates the ground 56 while pushing down the tip pile main body 12 </ b> A. In addition, when the length of the pile main body 12 is insufficient on the way, the pile main body 12 is extended by connecting the extension pile main body 12B to the tip pile main body 12A.

(2) When the tip of the tip pile main body 12A hits a thin intermediate layer (for example, a hard layer with an N value of 6 to 15 or a layer of sand and gravel) and cannot penetrate further, As shown in FIG. 1, the upper end of the insert pile 14 with the tip 34 facing downward is held and inserted into the pile body 12, and the tip 34 is abutted against the intermediate layer of the tip pile body 12A. In addition, although the pile main body 12 is hollow, for example, the diameter of the pile main body 12 used for a house is comparatively thin, and when the ground 56 is rotated and penetrated, soil or the like after excavating the pile main body is not included. Almost no tip 34 can reach the intermediate layer without difficulty.

  When the length of the insert pile 14 is insufficient, the extension pile 42 is connected to extend the insert pile 14. And when the front-end | tip part 34 collides with an intermediate | middle layer, it is made for the upper end of the insert pile 14 to protrude above the upper end of the pile main body 12. FIG.

  Since the outer diameter of the shaft portion 32 and the tip end portion 34 of the insert pile 14 is formed smaller than the inner diameter of the pile main body 12, when the insert pile 14 is inserted into the pile main body 12, The tip 34 can easily reach the upper part of the intermediate layer without bringing the portion into contact with the ground 56.

  Then, after covering the upper end of the shaft portion 32 of the insert pile 14 with a protective cap 50 (see FIG. 3C), the protective cap 50 is struck with a hammer or the like, so that the tip 34 is placed on the pile body as shown in FIG. The hard intermediate layer is broken by protruding from the lower end of 12. In addition, even if some earth and sand are contained in the inside of the pile main body 12, since the insert pile 14 is hit, the front-end | tip part 34 can be easily protruded toward the intermediate | middle layer from the lower end of the pile main body 12. FIG.

Since the tip end portion 34 has a pointed shape, the striking force can be locally concentrated on the intermediate layer, and is a shape suitable for breaking a hard intermediate layer.
Moreover, since the insert pile 14 has penetrated the inside of the pile main body 12, the surrounding surface frictional force of a ground is zero and a striking force can be minimized.

(3) Next, the insert pile 14 is pulled out and the pile body 12 is rotated again. Since the intermediate layer on the pile tip side has already been destroyed by the insert pile 14, the pile main body 12 can be easily rotated and penetrated toward the support layer.

(4) Then, the pile main body 12 is rotated and penetrated until the tip of the pile main body 12 reaches the target support layer.
Thus, by using the steel pipe pile 10 of this embodiment, a hard intermediate | middle layer can be destroyed and the pile main body 12 can be reached to the target support layer easily and reliably.
Moreover, since the pile main body 12 itself is not hit | damaged by using the steel pipe pile 10 of this embodiment, an excessive force is not applied to the spiral blade 18 and it is not damaged.

In the insert pile 14 of the present embodiment, the cross-sectional shape of the shaft portion 32 is circular. However, the cross-sectional shape of the shaft portion 32 may be other than a circle. For example, as shown in FIG. The cross-sectional shape may be a cross shape.
When the shaft portion 32 has a cross-shaped cross section, screw holes 70 are formed in the shaft 40 and the extension shaft 42, and the angle 72 is disposed along the shaft 40 and the extension shaft 42. The shaft portion 32 can be easily extended by inserting the bolt 76 and screwing the bolt 76 into the screw hole 70 of the shaft portion 32.

  In the above embodiment, when the insert pile 14 is hit, the upper end of the insert pile 14 is covered with the protective cap 50. However, the upper end of the insert pile 14 is strengthened by quenching or the like, and deformation or the like occurs due to the hit. If not, the protective cap 50 is not necessarily required.

[Second Embodiment]
Next, 2nd Embodiment of the steel pipe pile 10 of this invention is described according to FIG. 7 thru | or FIG. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.
As shown in FIGS. 7 and 8, the steel pipe pile 10 of this embodiment includes a so-called one-way clutch 58 that transmits a rotational force in one direction and does not transmit a rotational force in the other direction.

  The distal end portion 60 of the insert pile 14 of the present embodiment has a conical shape as a whole, a spiral groove 60A is formed on the outer peripheral surface of the distal end portion 60, and the distal end portion 60 has a substantially drill shape.

  The clutch 58 includes an annular tooth portion 62 composed of a large number of triangular teeth 62A formed at the end of the pile body 12 and an annular tooth portion composed of a large number of triangular teeth 64A formed at the tip portion 60. 64 and a coiled spring 66.

FIG. 9 is a developed view of the tooth portion 62 and the tooth portion 64.
As shown in FIG. 9A, the tooth 62A of the tooth portion 62 formed at the end of the pile body 12 has a large angle θ1 (<90 °) with respect to the radial direction (perpendicular to the axis) in a side view. It has a triangular shape having a steeply inclined side 62Aa and a gently inclined side 62Ab having a small angle θ2 (<θ1) with respect to the radial direction. The teeth 62A of the present embodiment are formed such that the steeply inclined side 62Aa is formed on the right side and the gently inclined side 62Ab is formed on the left side as viewed from the outer peripheral side. A plurality of teeth 62 </ b> A are formed along the outer peripheral edge of the disk 36, and can be formed by cutting a steel pipe end portion or the like.

  As shown in FIG. 8, in the present embodiment, the outer diameter of the tip portion 60 is larger than the inner diameter of the steel pipe of the pile body 12, and the outer diameter of the tip portion 60 is the same as the outer diameter of the steel pipe. In addition, the shaft portion 32 of the insert pile 14 is inserted into the pile main body 12 in advance, and the tip end portion 60 protrudes from the end of the pile main body 12 on the spiral blade 18 side.

As shown in FIG. 7 and FIG. 8, the annular tooth portion 64 described above is formed at the tip portion 60 at a position facing the tooth portion 62 of the pile body 12. The teeth 64 </ b> A of the tooth portion 64 have the same triangular shape as the teeth 62 </ b> A of the pile main body 12, but are formed in the opposite direction to the teeth 62 </ b> A of the pile main body 12. The teeth 64A of the tip portion 60 can be formed by cutting a steel plate or the like, and are joined to the tip portion 60 by welding or the like.
A large diameter portion 68 is formed on a part of the inner peripheral surface of the pile body 12 on the lower end side. The large diameter portion 68 can be formed by cutting the inner peripheral surface of the steel pipe with a lathe or the like.

  As shown in FIG. 8, in the steel pipe pile 10 of this embodiment, the outer diameter of the front-end | tip part 60 is made into the same diameter as the outer diameter of the steel pipe of the pile main body 12, and the axial part 32 has insert shaft 14 beforehand. It is inserted in the pile main body 12, and the tip end portion 60 protrudes from the end of the pile main body 12 on the spiral wing 18 side.

  A spring 66 is inserted into the large diameter portion 68 of the pile body 12. The spring 66 has one end in contact with the stepped portion of the large-diameter portion 68 and the other end in contact with the tip portion 60. Normally, as shown in FIG. 8 and FIG. 64 is spaced apart in the axial direction to form a gap.

  Then, as shown in FIG. 9A, in the state where the tooth portion 62 and the tooth portion 64 are spaced apart in the axial direction to form a gap, as shown in FIG. 8, the protective cap 50 of the insert pile 14 is formed. The upper end of the pile body 12 and the upper end of the pile body 12 are substantially flush with each other.

(Function)
Next, the construction method using the steel pipe pile 10 of this embodiment is demonstrated.
(1) First, the steel pipe pile 10 which combined the pile main body 12 and the insert pile 14 is attached to the pile driving machine 54, and it rotates while pushing down the steel pipe pile 10, and as shown in FIG. Rotating and penetrating (Pile driver 54 is not shown in FIG. 10).

  As shown in FIG. 7, by rotating the pile main body 12 in the direction of arrow C (the teeth 62 </ b> A move to the left as viewed from the outer peripheral side), the teeth 62 </ b> A of the pile main body 12 are changed as shown in FIG. The teeth 62 </ b> A and the teeth 64 </ b> A are completely engaged (the clutch is connected) by contacting the teeth 64 </ b> A of the tip portion 60, the spring 66 is compressed, and the rotational force of the pile body 12 is transmitted to the tip portion 60.

  Since the distal end portion 60 is formed with the spiral groove 60A, the ground 56 can be excavated together with the spiral blade 18 of the steel pipe pile 10, and excavation can be performed more efficiently than in the first embodiment. Become.

  Also in this embodiment, when the length of the steel pipe pile 10 is insufficient on the way, the pile body 12 is extended by connecting the extension pile body 12B to the tip pile body 12A as shown in FIG. The insert pile 14 is also extended by connecting the extension shaft 42.

(2) The tip of the pile driver 54 is removed from the upper end of the steel pipe pile 10 when the tip of the tip pile main body 12A hits a hard intermediate layer and cannot penetrate further.
By removing the motor and stopping the rotation, the pile body 12 is moved upward by the urging force of the spring 66, and the teeth 62A of the pile body 12 are moved from the teeth 64A of the tip 60 as shown in FIG. A gap is formed between the teeth 62A and the teeth 64A.
Then, the protective cap 50 is put on the upper end of the insert pile 14.

  In addition, the steel pipe pile 10 of this embodiment is the state which is not giving load to the steel pipe pile 10, ie, the state which separated the motor of the pile driver from the steel pipe pile 10, and the pile main body 12 The length of each of the shaft portion 32, the spring 66, and the pile body 12 is set in advance so that the upper end of the shaft is flush or substantially flush.

  After retracting the motor from above the steel pipe pile 10, the intermediate layer is destroyed by hitting the upper end of the protective cap 50 and the upper end of the pile main body 12 with a hammer or the like.

  When striking, the lower end of the pile main body 12 and the tip end portion 60 are spaced apart in the axial direction, and the spring 66 is provided between the pile main body 12 and the tip end portion 60. It acts as a cushioning material, and the upper part (tooth 64A) of the tip part 60 and the lower end (tooth 62A) of the pile body 12 are not damaged, and the striking force is mostly applied to the tip part 60 via the insert pile 14. The hard intermediate layer can be broken without being subjected to excessive force applied to the spiral wing 18.

(3) After destroying the intermediate layer in this way, the motor of the pile driving machine 54 is engaged with the steel pipe pile 10 to rotate the steel pipe pile 10 again. Since the hard intermediate layer is broken by the insert pile 14, the steel pipe pile 10 can be penetrated toward the support layer without difficulty.

(4) Then, rotation penetration of the steel pipe pile 10 is performed until the front-end | tip of the steel pipe pile 10 reaches a support layer.
By using the steel pipe pile 10 of this embodiment, the pile main body 12 can be easily rotated and penetrated to the target support layer by breaking the hard intermediate layer as in the first embodiment.

  Since the steel pile pile 10 of this embodiment has the insert pile 14 incorporated in advance, there is no need to insert / remove the insert pile 14 during excavation, and the work is easier than that of the first embodiment. Become.

  As shown in FIG. 9C, when the pile body 12 is rotated in the direction of arrow D (the teeth 62A move to the right when viewed from the outer periphery side), the teeth 62A of the pile body 12 are The steeply inclined side 64Aa of the tooth 64A is slid toward the apex of the triangle, and the meshing of the tooth 62A and the tooth 64A is released, so that the pile body 12 can be continuously rotated in the direction of arrow D (that is, the clutch is Come off).

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 Steel pipe pile 12 Pile main body 12A Tip pile main body 12B Extension pile main body 14 Insert pile (striking means)
18 Spiral Wings (Wings)
22 Female screw (pile body connecting means)
24 Male screw (pile body connecting means)
32 Shaft portion 34 Tip portion 38 Arrowhead member (triangular plate member)
40 shaft (shaft)
42 Extension shaft (shaft)
44 Male screw (shaft member connecting means)
46 Female screw (shaft member connecting means)
48 Male screw (shaft member connecting means)
60 Tip portion 70 Screw hole (shaft member connecting means)
72 angle (shaft member connection means)
74 hole (shaft member connecting means)
76 bolts (shaft member connection means)

Claims (5)

A pile body that is formed in a hollow shape and has wings on the outer periphery on the end side in the direction of penetration into the ground,
A steel pipe pile having a sharp shape on the end side in the penetration direction to the ground, and a striking means inserted into the pile body. The striking means has a tip portion having a sharp shape on the end side in the penetration direction to the ground, and a shaft portion connected to the opposite side to the penetration direction of the tip portion,
The steel pipe pile according to claim 1, wherein a part of a shaft portion connecting means for connecting a shaft portion for addition is provided at an end portion of the shaft portion.   The said front-end | tip part is a steel pipe pile of Claim 2 formed by connecting the several triangular board member which becomes narrow toward the penetration direction end side by side view at the axial center side.   The steel pipe pile according to any one of claims 1 to 3, wherein a maximum diameter of the hitting means is set smaller than an inner diameter of the pile body.   The steel pipe pile according to any one of claims 1 to 4, wherein a part of a pile body connecting means for connecting a steel pipe for addition is provided at an end of the pile body.