Winged steel pipe pile installation device and method for installing a winged steel pipe pile

Abstract

To provide an installation device for a steel pipe pile with a fin allowing a casing to be removed from the fin in a simple structure without obstructing rotation of the casing.SOLUTION: An installation device for a steel pipe pile with a fin according to the present invention is provided with a casing 20 extending in a vertical direction, a hook member 30 tiltably supported on a casing 20, and a fin 10 detachably supported on the casing 20 through the hook member 30, wherein the hook member 30 is tiltable between a normal position and an escape position where a tip side in the hook member 30 is positioned at a position above the normal position and at least at one side of a first rotational direction. The hook member 30 at the normal position is in an engagement state when rotating the casing 20 in the first rotational direction and in a release state when rotating the casing 20 in a second rotational direction, and the hook member 30 tilts from the normal position to the escape position by force from the fin upon abutment of the hook member in the release state with the fin 10 when rotating the casing in the second rotational direction.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a winged steel pipe pile installation device and a winged steel pipe pile installation method. [Background technology]

[0002] When constructing a building, pile foundations may be installed in the ground using the rotary press-in method. In rotary press-in method using steel pipe piles, it is known that an effective method is to attach fins (wings) to the end of the steel pipe pile facing the ground in order to make it easier to press in by rotation during construction and to increase the bearing capacity of the ground after construction. It is also known that the fins and a thin-diameter steel pipe pile are separately inserted into the ground to create a steel pipe pile with wings.

[0003] Patent Document 1 describes a method for installing a winged steel pipe pile that improves the bearing capacity of the ground. The casing used in this method is composed of a casing body which is a hollow tube, a first fin fixedly attached to the outer periphery of the ground side end of the casing body, a second fin detachably engaged with the bottom surface of the ground side end of the casing body so as to cover the opening, and at least one hook mechanism for detachably engaging the second fin with the casing body. Two examples of the hook mechanism are disclosed in the publication.

[0004] The hook mechanism of the first example is composed of a base part attached to the underside of the surface of the first fin, and a claw part provided at the tip of the base part for engaging the second fin. When the casing is rotated and pressed into the ground by the rotary press-in method, the claw part of the hook mechanism automatically engages with the second fin due to the forward rotation, and when the casing is rotated in the reverse direction to be pulled out above ground, the claw part of the hook mechanism automatically disengages from the second fin.

[0005] The hook mechanism of the second example is composed of a first arm supported on a fulcrum inside the casing body so as to be rotatable in the vertical direction, a second arm articulated to the outer end of the first arm and extending to the outside of the casing body, and a claw provided at the tip of the second arm for engaging the second fin. When the casing is rotary-pressed into the ground by the rotary press-in method, and when the casing is rotated in the reverse direction midway through and pulled out for some reason, the second fin engaged by this hook mechanism rotates in the same direction together with the casing body. The inner end of the first arm of the hook mechanism is positioned so that it comes into contact with the circumferential portion of a small-diameter steel pipe pile when the steel pipe pile is guided by a protruding portion protruding from the center of the second fin. When the casing reaches a designated position in the ground and the steel pipe pile is inserted into the hollow portion of the casing body, the circumferential portion of the steel pipe pile pushes the inner end of the first arm of the hook mechanism, causing the second arm to lift and the claw portion to detach from the second fin. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-151850 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the hook mechanism of the casing of the first example described in Patent Document 1, the base part is attached to the lower surface of the first fin and extends toward the second fin (fin), so when the casing body (casing) is rotated in the reverse direction (rotated in the opposite direction to the press-in direction), the base part may interfere with the blade on the opposite side of the second fin, and the hook mechanism may interfere with the rotation of the casing. In addition, in the hook mechanism of the casing of the second example described in Patent Document 1, in order to detach the casing body (casing) from the second fin (fin), the inner end of the first arm of the hook mechanism is positioned so that the circumferential part of the small diameter steel pipe pile contacts the inner end of the first arm of the hook mechanism. This may result in a complicated structure.

[0008] Therefore, an object of the present disclosure is to provide a winged steel pipe pile installation device and a winged steel pipe pile installation method that enable the casing to be detached from the fin with a simple structure without interfering with the rotation of the casing. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, a winged steel pipe pile installation device according to a first aspect of the present invention comprises a hollow tubular casing extending in a predetermined direction and defining a pile insertion space into which a steel pipe pile can be inserted, a hook member provided on an outer circumferential surface of one end of the casing on one side in the predetermined direction and supported on the casing so as to be tiltable about a predetermined hook rotation axis, and a fin having a central portion covering one side opening on one side of the casing, a pile connecting portion protruding from the central portion to the other side in the predetermined direction and connectable to the steel pipe pile, and a wing-like portion extending outward from the central portion, the fin being detachably supported on the casing via the hook member, the hook member having a normal position extending from the hook rotation axis side toward the radially outward side of the casing and a rotational position in which a tip side of the hook member is positioned on at least one side of the other side in the predetermined direction and in a first rotation direction of the casing relative to the normal position. When the casing is rotated in a first rotation direction with the central portion of the fin covering the one side opening of the casing, the hook member in the normal position is in an engaged state in which the wing-like portion of the fin is engaged, and when the casing is rotated in a second rotation direction opposite to the first rotation direction, the hook member in the normal position is in a released state in which the engagement of the fin is released. In the engaged state, the fin rotates in the first rotation direction in conjunction with the rotation of the casing in the first rotation direction, and in the released state, the fin does not rotate even when the casing is rotated in the second rotation direction. When the hook member in the released state comes into contact with the wing-like portion of the fin when the casing is rotated in the second rotation direction, the hook member is tilted from the normal position to the avoidance position around the hook rotation axis by the force from the fin.

[0010] A second aspect of the present invention is a wing-equipped steel pipe pile installation device of the first aspect described above, wherein the wing-like portion of the fin in the engaged state is inclined with respect to a plane perpendicular to the rotation axis of the casing so that the end on the first rotation direction side is positioned closer to one side of the specified direction than the end on the second rotation direction side, and the hook rotation axis of the hook member extends from the other side of the specified direction toward the first rotation direction on one side of the specified direction when viewed radially of the casing, and is inclined with respect to the rotation axis of the casing.

[0011] A third aspect of the present invention is a wing-equipped steel pipe pile installation device of the first aspect or the second aspect, wherein the hook member has an arm portion extending radially outward from the casing side in the normal position, and a claw portion bent from the tip of the arm portion to the one side in the specified direction, and the end of the claw portion of the hook member facing the one side in the specified direction and the second rotation direction in the normal position is inclined with respect to the edge of the one side in the specified direction and the edge of the claw portion in the second rotation direction.

[0012] A fourth aspect of the present invention is a winged steel pipe pile installation device according to any one of the first to third aspects, wherein the pile connection portion of the fin is formed in a cylindrical shape to allow insertion of the end of the steel pipe pile on one side in the specified direction, the inner surface of the casing has a large diameter region extending from the one side opening to the other side in the specified direction, and a small diameter region formed with a smaller diameter than the large diameter region and extending from the large diameter region to the other side in the specified direction, the large diameter region on the inner surface of the casing defines a space to allow insertion of the pile connection portion of the fin, and the diameter of the small diameter region on the inner surface of the casing is formed to be smaller than the inner diameter of the pile connection portion.

[0013] A fifth aspect of the present invention is a wing-equipped steel pipe pile installation device of any of the first to fourth aspects, comprising a rotation confirmation member which is inserted into the pile insertion space from the other side in the specified direction of the casing and is removably supported on the other end in the specified direction of the steel pipe pile when inserted into the pile insertion space, and the other end in the specified direction of the rotation confirmation member is exposed to the other side in the specified direction from the pile insertion space of the casing when the rotation confirmation member is supported on the steel pipe pile, and the rotation confirmation member in the state supported on the steel pipe pile rotates when the steel pipe pile rotates and does not rotate when the steel pipe pile does not rotate.

[0014] A sixth aspect of the present invention is a method for installing a winged steel pipe pile using a winged steel pipe pile installation device of any of the first to fourth aspects, comprising a rotary pressing process in which the casing and the fin in the engaged state are rotated in the first rotational direction to rotary press them into the ground, a connection process in which, after the fin reaches a desired position, the rotation is stopped and the steel pipe pile is inserted into the pile insertion space from the other side of the casing and the steel pipe pile is connected to the pile connection portion of the fin, and an extraction process in which the casing is rotated in the second rotational direction while leaving the fin and the steel pipe pile in place, and the casing is pulled out of the ground.

[0015] A seventh aspect of the present invention is a method for installing a winged steel pipe pile using the winged steel pipe pile installation device of the fifth aspect, comprising: a rotary pressing process for rotating the casing and the fin in the engaged state in the first rotation direction to rotary press the pile into the ground; a connection process for stopping the rotation after the fin reaches a desired position, inserting the steel pipe pile into the pile insertion space from the other side of the casing and connecting the steel pipe pile to the pile connection portion of the fin; a confirmation process for inserting the rotation confirmation member into the pile insertion space from the other side of the casing and attaching it to the steel pipe pile, and then rotating the casing in the second rotation direction to confirm that the fin will not rotate even if the casing is rotated; and an extraction process for rotating the casing in the second rotation direction while leaving the fin and the steel pipe pile in place, and extracting the casing from the ground. Effect of the Invention

[0016] According to the present disclosure, the casing can be detached from the fins with a simple structure without interfering with the rotation of the casing. [Brief description of the drawings]

[0017] [Figure 1] 1 is an external view of a winged steel pipe pile installation device according to an embodiment of the present invention. FIG. [Diagram 2] 1A and 1B are diagrams showing the manufacturing process of the fin, in which (a) shows the state after the notches are made, (b) shows the state before bending, and (c) shows the state after bending. [Diagram 3] FIG. 4 is an external view of a casing and a hook member. [Figure 4] FIG. 4 is an external view of FIG. 3 as viewed from a direction IV. [Diagram 5] 13 is a perspective view of the hook member and the fin in an engaged state, seen from below. FIG. [Figure 6] 5A to 5C are explanatory diagrams of a hook member, in which (a) shows the hook member separated from the wing-like portion of the fin, (b) shows the hook member abutting against the upper surface of the wing-like portion, and (c) shows the hook member tilted. [Figure 7] FIG. 2 is a perspective view from above showing the connection portion between the casing, the fin, and the steel pipe pile. [Figure 8] FIG. 13 is an external view of the casing with the confirmation rod inserted therein. [Figure 9] FIG. 1 is an explanatory diagram of a method for installing a winged steel pipe pile according to one embodiment of the present invention, in which (a) shows the state in which the fin has been rotated and pressed into the desired position, and (b) shows the state in which the casing is being pulled out. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, UP indicates the upward direction. In each drawing, CL1 indicates the rotation axis (shaft center) of the casing 20, and CL2 indicates the hook rotation axis (shaft center) of the hook member 30. In addition, in the following description, a predetermined direction is defined as the up-down direction, one side of the predetermined direction is defined as the lower side, and the other side of the predetermined direction is defined as the upper side.

[0019] FIG. 1 is an external view of a winged steel pipe pile installation device 1 according to an embodiment of the present invention. FIG. 2 is a diagram showing a manufacturing process of a fin 10, in which (a) shows a state where a cut is made, (b) shows a state before bending, and (c) shows a state after bending. FIG. 3 is an external view of a casing 20 and a hook member 30. FIG. 4 is an external view of FIG. 3 as viewed from the IV direction. FIG. 5 is a perspective view of the hook member 30 and the fin 10 in a locked state from below. FIG. 6 is an explanatory diagram of the hook member 30, in which (a) shows a state where it is separated from the wing-like portion 12 of the fin 10, (b) shows a state where it is abutted against the upper surface 14 of the wing-like portion 12, and (c) shows a state where it is tilted. FIG. 7 is an oblique view from above showing a connection portion of the casing 20, the fin 10, and the steel pipe pile 50. FIG. 8 is an external view of the casing 20 in a state where a confirmation rod 40 is inserted. 9 is an explanatory diagram of a method for installing a winged steel pipe pile according to one embodiment of the present invention, in which (a) shows a state in which the fin 10 has been rotated and pressed into a desired position, and (b) shows a state in which the casing 20 is being pulled out. Note that the hook member 30 is not shown in FIG.

[0020] As shown in Fig. 1, the winged steel pipe pile installation device 1 according to this embodiment is a device for installing winged steel pipe piles in the ground, which serve as pile foundations when constructing a building. When installing a winged steel pipe pile in the ground, first, the fins 10 (wings) are installed in the ground, and then the steel pipe pile 50 is connected to the fins 10 installed in the ground (see Fig. 9(b)). In other words, the winged steel pipe pile is composed of the fins 10 and the steel pipe pile 50 connected to the fins 10.

[0021] The steel pipe pile 50 has a diameter as small as possible within a range where a predetermined bearing capacity after construction can be obtained, and has a connection portion 50a at the lower end (see Fig. 7 and Fig. 9(b)). The connection portion 50a is provided with a protrusion 51 protruding from the outer circumferential surface of the connection portion 50a. The protrusion 51 is supported by the steel pipe pile 50 in a state where it is biased from the radial inside to the radial outside of the steel pipe pile 50. The protrusion 51 is pressed from the radial outside and retracts radially inward against the biasing force, and when the input of force from the radial outside is no longer applied, it is biased from the radial inside and protrudes radially outward. The steel pipe pile 50 is not particularly limited as long as it has an outer diameter R2 that can be inserted into the casing 20 and can maintain its strength after construction, but for example, a single pipe can be used as a suitable example.

[0022] The winged steel pipe pile installation device 1 according to this embodiment includes a fin 10 for burying in the ground, a hollow tubular casing 20 extending in the vertical direction, a hook member 30 for engaging the fin 10, and a confirmation rod (rotation confirmation member) 40 capable of confirming the rotation of the fin 10. In the following description, the first rotation direction is the direction in which the casing 20 is rotated during excavation (in this embodiment, the clockwise direction when viewed from above), and the second rotation direction is the direction opposite to the first rotation direction (in this embodiment, the direction opposite to the clockwise direction when viewed from above).

[0023] 1 and 2, the fin 10 has a generally square central portion 11 that abuts against the bottom surface of the lower end portion (one end portion) 20a of the casing 20 and covers the lower end opening (one side opening) 20b (see FIG. 7) of the casing 20, four wing-like portions 12 extending outward from each of the four sides of the central portion 11, and a cylindrical pile connection portion 13 that is integrally provided at approximately the center of the central portion 11. The central portion 11 and the four wing-like portions 12 of the fin 10 are formed by a single plate-like member 16 as described below (see FIG. 2(a)).

[0024] The central portion 11 of the fin 10 is formed in a plate shape intersecting a predetermined direction (the up-down direction in this embodiment). As will be described later, when the fin 10 is attached to the casing 20 and locked, the central portion 11 intersects with the rotation axis CL1 of the casing 20 (see FIG. 1).

[0025] The cylindrical pile connection part 13 of the fin 10 is disposed at approximately the center of the upper surface of the central part 11 and protrudes upward. The pile connection part 13 defines a space 15 that is open upward. The space 15 of the pile connection part 13 is formed to a size that allows the insertion of the connection part 50a of the steel pipe pile 50. The pile connection part 13 is provided with an opening 13a that radially communicates the inner space 15 with the outside. The opening 13a of the pile connection part 13 is formed to a size that allows the protrusion part 51 (see FIG. 7) of the steel pipe pile 50 to be engaged. When the connection part 50a of the steel pipe pile 50 is inserted into the space 15 of the pile connection part 13, the protrusion part 51 of the steel pipe pile 50 is pressed radially inward by contacting the pile connection part 13 and retracted, and when it reaches the position of the opening 13a of the pile connection part 13, it is urged from the radially inner side and protrudes radially outward, and is engaged with the opening 13a of the pile connection part 13. This connects the steel pipe pile 50 and the fin 10. In the state in which the steel pipe pile 50 and the fin 10 are connected, the relative rotation between the steel pipe pile 50 and the fin 10 is restricted by the engagement between the protrusion 51 of the steel pipe pile 50 and the opening 13a of the pile connection portion 13.

[0026] The four wings 12 of the fin 10 are formed by being alternately bent upward and downward with respect to the central portion 11. Specifically, the first wing 12a is bent upward with respect to the central portion 11, the second wing 12b adjacent to the first wing 12a is bent downward with respect to the central portion 11, the third wing 12c diagonally opposite the second wing 12b is bent downward with respect to the central portion 11, and the fourth wing 12d adjacent to the third wing 12c is bent upward with respect to the central portion 11 (see Figs. 2(b) and 2(c)). In other words, the wings 12 diagonally opposite are bent in the same direction, i.e., the first and fourth wing 12a, 12d are both bent upward with respect to the central portion 11, and the second and third wing 12b, 12c are both bent downward with respect to the central portion 11. Each wing-like portion 12 is inclined with respect to the central portion 11 so that the end portion on the first rotation direction side (the direction shown by the white arrow in FIG. 2(c)) is located lower than the end portion on the second rotation direction side (the opposite direction to the white arrow in FIG. 2(c)). That is, each wing-like portion 12 is inclined with respect to a plane perpendicular to the rotation axis CL1 of the casing 20 so that the end portion on the first rotation direction side is located lower than the end portion on the second rotation direction side in a locked state in which the fin 10 is attached to the casing 20 as described later. The shape of the fin 10 is not limited to the shape described here, and for example, the central portion 11 does not have to be square, and may be any shape as long as it can cover the lower end opening 20b of the casing 20. The wing-like portion 12 does not have to be a shape obtained by bending a rectangle obliquely, and may be a fan shape or a ring shape, and the number of wing-like portions may be appropriately determined. Furthermore, the material from which the fins 10 are made may be metal (for example, steel) or polyvinyl chloride, and an appropriate material may be selected taking into consideration the material from which the casing 20 is made.

[0027] As shown in Figs. 3 to 7, the casing 20 is a hollow tubular (cylindrical in this embodiment) member, and defines a pile insertion space 21 into which a steel pipe pile 50 can be inserted. A plurality of cutting blades 22 are spirally provided on the outer peripheral surface 61 of the casing 20. As shown in Fig. 7, the inner peripheral surface 23 of the casing 20 has a large diameter region 23a extending continuously upward from the lower end opening 20b, and a small diameter region 23b extending upward from the large diameter region 23a. The inner diameter r1 of the large diameter region 23a of the inner peripheral surface 23 of the casing 20 is slightly larger than the outer diameter R1 of the pile connection portion 13 of the fin 10. That is, the large diameter region 23a of the inner peripheral surface 23 of the casing 20 defines a space 24 that allows the pile connection portion 13 of the fin 10 to be inserted. The vertical length L1 of the large diameter region 23a of the inner circumferential surface 23 of the casing 20 is set to be equal to or larger than the vertical length L2 of the pile connection portion 13 (slightly longer than the vertical length L2 of the pile connection portion 13 in this embodiment). The small diameter region 23b of the inner circumferential surface 23 of the casing 20 is formed to be smaller than the large diameter region 23a. The inner diameter (diameter) r2 of the small diameter region 23b of the inner circumferential surface 23 of the casing 20 is formed to be equal to or smaller than the inner diameter r3 of the pile connection portion 13 of the fin 10 (in this embodiment, the same as the inner diameter r3 of the pile connection portion 13). The inner diameter r2 of the small diameter region 23b of the inner circumferential surface 23 of the casing 20 and the inner diameter r3 of the pile connection portion 13 are larger than the outer diameter R2 of the steel pipe pile 50. In this embodiment, a plurality of cutting blades 22 are provided on the outer peripheral surface 61 of the casing 20, but the present invention is not limited thereto. For example, a spiral cutting blade 22 that is continuous vertically may be provided. Alternatively, the cutting blade 22 may not be provided on the outer peripheral surface 61 of the casing 20. In this embodiment, the casing 20 has a cylindrical shape, but the outer shape of the cross section of the casing 20 is not limited to a circle as long as it is a hollow cylinder. For example, the outer shape of the cross section of the casing 20 may be a square. The material forming the casing 20 may be made of metal (for example, steel) or polyvinyl chloride. The strength of the casing 20 made of polyvinyl chloride is slightly lower than that of the casing 20 made of a steel pipe, for example, but a material suitable for the ground conditions at the construction site may be selected.

[0028] As shown in Figs. 3 to 5, a hook support portion 25 is fixedly provided at the lower end portion 20a of the casing 20. In this embodiment, two hook support portions 25 are provided. The two hook support portions 25 are provided on both sides of the casing 20 in a direction intersecting with the rotation axis CL1, and protrude radially outward from the outer circumferential surface 61 of the casing 20. The hook support portion 25 has an upper plate portion 25a, a lower plate portion 25b, and a connecting plate portion 25c. The upper plate portion 25a and the lower plate portion 25b are plate portions intersecting with the up-down direction and are arranged spaced apart from each other vertically. The upper plate portion 25a and the lower plate portion 25b are inclined with respect to a plane perpendicular to the rotation axis CL1 of the casing 20 so that the end portions on the first rotation direction side are positioned higher than the end portions on the second rotation direction side. The connecting plate portion 25c is a plate portion that connects the end portions on the second rotation direction side of the upper plate portion 25a and the lower plate portion 25b. The upper plate portion 25a, the lower plate portion 25b, and the connecting plate portion 25c define a space 29 into which the hook member 30 can be inserted. The space 29 of the hook support portion 25 is open to the radially outward side and the first rotation direction side of the casing 20. As shown in FIG. 5, in this embodiment, the portion where the lower end edge of the connecting plate portion 25c and the end edge of the lower plate portion 25b on the second rotation direction side intersect is chamfered to form an inclined surface 28 that is inclined with respect to the surface 26 on the second rotation direction side of the connecting plate portion 25c and the lower surface 27 of the lower plate portion 25b. The hook support portion 25 is disposed at a height position that does not abut (does not interfere with) the wing-like portion 12 of the fin 10 (the first and fourth wing-like portions 12a, 12d in this embodiment) even when the casing 20 is rotated with the bottom surface of the lower end portion 20a of the casing 20 abutted against the upper surface of the central portion 11 of the fin 10.

[0029] As shown in Figs. 3 to 6, the hook member 30 is a member that detachably engages the casing 20 and the fin 10, and is supported by the casing 20 (the hook support portion 25 in this embodiment) so as to be tiltable about the hook rotation axis CL2. In this embodiment, two hook members 30 are provided. The hook member 30 is tiltable about the hook rotation axis CL2 between a normal position (the position of the hook member 30 shown in Figs. 6(a) and 6(b)) extending from the hook rotation axis CL2 side toward the radial outside of the casing 20, and an avoidance position (the position of the hook member 30 shown in Fig. 6(c)) in which the tip side of the hook member 30 is positioned above the normal position and at least on one side in the first rotation direction (upper and first rotation direction in this embodiment) from the normal position. The hook rotation axis CL2 of the hook member 30 is a rotation axis perpendicular to the upper plate portion 25a and the lower plate portion 25b of the hook support portion 25, and extends downward in the first rotation direction from the upper side when viewed from the radial direction of the casing 20, and is inclined with respect to the rotation axis CL1 of the casing 20 (see Figs. 4 and 5). In the following description, the directions related to the hook member 30 indicate the directions in the normal position unless otherwise specified. Furthermore, the radial direction in the description of the hook member 30 indicates the radial direction of the casing 20.

[0030] The hook member 30 integrally includes an arm portion 31 extending radially outward from the hook rotation axis CL2 side of the casing 20, and a claw portion 32 bent downward from the tip of the arm portion 31. The arm portion 31 is formed in a plate shape that intersects with the up-down direction of the plate thickness that can be inserted into the space 29 of the hook support portion 25, and is inserted into the space 29 of the hook support portion 25. The arm portion 31 is supported by the upper plate portion 25a and the lower plate portion 25b of the hook support portion 25 so as to be tiltable about the hook rotation axis CL2. The claw portion 32 is folded downward from the radially outer edge of the arm portion 31. As shown in FIG. 5, the portion where the lower edge (edge ​​on one side in a predetermined direction) 34 of the claw portion 32 and the edge 35 in the second rotation direction intersect is chamfered, and forms an inclined surface 33 (curved surface in this embodiment) that is inclined with respect to the lower edge 34 of the claw portion 32 and the edge 35 in the second rotation direction of the claw portion 32. That is, the lower end (inclined surface 33) of the claw portion 32 in the second rotation direction is inclined with respect to the lower end edge 34 of the claw portion 32 and the end edge 35 of the claw portion 32 in the second rotation direction. In the normal position of the hook member 30, the arm portion 31 extends radially outward from the hook rotation axis CL2 side, and in the avoidance position of the hook member 30, the arm portion 31 extends upward in the first rotation direction from the hook rotation axis CL2 side. The hook member 30 can be tilted along the lower surface of the upper plate portion 25a and the upper surface of the lower plate portion 25b of the hook support portion 25, centered on the hook rotation axis CL2. That is, the tip side (claw portion 32 side) of the hook member 30 can be tilted from the normal position to the avoidance position on the upper side in the first rotation direction, centered on the hook rotation axis CL2. The upper plate portion 25a and the lower plate portion 25b of the hook support portion 25 are inclined so that the end portion on the second rotation direction side is positioned lower than the end portion on the first rotation direction side, so that the arm portion 31 of the hook member 30 is positioned in its normal position by its own weight when not subjected to an external force.

[0031] When the fin 10 is engaged with the casing 20 side by the hook member 30, the casing 20 is rotated in a first rotation direction with the pile connection portion 13 of the fin 10 inserted from the lower end opening 20b of the casing 20 into the space 24 defined by the large diameter region 23a of the inner circumferential surface 23. When the pile connection portion 13 of the fin 10 is inserted from the lower end opening 20b of the casing 20 into the space 24 defined by the large diameter region 23a of the inner circumferential surface 23, the lower end opening 20b of the casing 20 is covered by the central portion 11 of the fin 10. That is, when the fin 10 is engaged with the casing 20 side by the hook member 30, the casing 20 is rotated in the first rotation direction with the central portion 11 of the fin 10 covering the lower end opening 20b of the casing 20. When the casing 20 is rotated in the first rotation direction, the claw portion 32 of the hook member 30 in the normal position automatically engages the wing portion 12 of the fin 10 to enter the engaged state (see Figs. 1 and 5). In this embodiment, the claw portion 32 of the hook member 30 in the engaged state engages the first and fourth wing portions 12a, 12d located above the central portion 11. In the engaged state, the bottom surface of the lower end portion 20a of the casing 20 abuts against the upper surface of the central portion 11 of the fin 10, and the lower end opening 20b of the casing 20 is covered by the central portion 11 of the fin 10. When the casing 20 is rotated in the first rotation direction, the fin 10 in the engaged state rotates in the first rotation direction in conjunction with the rotation of the casing 20. To release the engagement of the fin 10 by the hook member 30, the casing 20 is rotated in the second rotation direction from the engaged state. When the casing 20 is rotated in the second rotation direction from the locked state, the claw portion 32 of the hook member 30 in the normal position automatically disengages from the wing-like portion 12 of the fin 10, and the fin 10 is released from the locked state on the casing 20 side (see FIG. 6(a)). That is, the fin 10 is detachably supported on the casing 20 via the hook member 30. When the casing 20 is further rotated in the second rotation direction and the hook member 30 in the unlocked normal position abuts against the upper surface 14 of the wing-like portion 12 of the fin 10 (see FIG. 6(b)), the tip side (claw portion 32 side) of the hook member 30 tilts from the normal position to the upper avoidance position in the first rotation direction around the hook rotation axis CL2 due to the force from the wing-like portion 12 of the fin 10 (see FIG. 6(c)).That is, in the released state, even if the casing 20 is rotated in the second rotation direction, the fins 10 do not rotate. In this embodiment, two hook members 30 are provided, but this is not limited to this, and one or three or more hook members 30 may be provided taking into consideration the ground conditions, the shape of the fins 10, and the like.

[0032] As shown in FIG. 8, the confirmation rod 40 is a rod-shaped member for confirming the rotation of the fin 10, and is used by being inserted into the pile insertion space 21 (see FIG. 7) from the upper end opening 20c (the opening 20c on the other side in the predetermined direction) of the casing 20. The lower end 40a of the confirmation rod 40 inserted into the pile insertion space 21 of the casing 20 is detachably connected to the upper end 52 of the steel pipe pile 50 in the pile insertion space 21. The connection between the confirmation rod 40 and the steel pipe pile 50 means a state in which the confirmation rod 40 is rotatably connected to the steel pipe pile 50 when the steel pipe pile 50 rotates, and may be, for example, a state in which the lower end surface of the confirmation rod 40 is placed on the upper end surface of the steel pipe pile 50, and when the steel pipe pile 50 rotates, the confirmation rod 40 is rotated by friction. In the state in which the confirmation rod 40 and the steel pipe pile 50 are connected, the confirmation rod 40 is supported from below by the steel pipe pile 50. In this embodiment, the lower end 40a of the confirmation rod 40 is formed thin so that it can be inserted into the inner diameter part of the upper end 52 of the steel pipe pile 50. By pulling the confirmation rod 40 upward from the casing 20, the lower end 40a of the confirmation rod 40 can be removed from the upper end 52 of the steel pipe pile 50. When the confirmation rod 40 is inserted into the pile insertion space 21 from the upper end opening 20c of the casing 20 and the lower end 40a of the confirmation rod 40 is inserted into the inner diameter part of the upper end 52 of the steel pipe pile 50 and attached, the confirmation rod 40 is supported by the steel pipe pile 50 from below. When the steel pipe pile 50 is inserted into the pile insertion space 21 of the casing 20 and connected to the fin 10, the length L3 from the upper end of the steel pipe pile 50 to the upper end of the confirmation rod 40 is set longer than the length L4 from the upper end of the steel pipe pile 50 to the upper end opening 20c of the casing 20. That is, the upper end of the confirmation rod 40 is exposed upward from the pile insertion space 21 of the casing 20 with the lower end 40a of the confirmation rod 40 supported by the upper end 52 of the steel pipe pile 50. A head 41 extending in a direction intersecting the axial direction is provided at the upper end of the confirmation rod 40. The length of the head 41 in the direction intersecting the axial direction is set so that the head 41 extends radially outward beyond the outer shape of the casing 20 with the confirmation rod 40 inserted into the pile insertion space 21 of the casing 20. The confirmation rod 40 supported by the steel pipe pile 50 rotates when the steel pipe pile 50 rotates with the rotation of the fin 10, and does not rotate when the fin 10 and the steel pipe pile 50 do not rotate.

[0033] Next, a method for installing a winged steel pipe pile according to one embodiment of the present invention will be described with reference to Figs. 7 to 9. The method for installing a winged steel pipe pile is a construction method for installing a winged steel pipe pile (fin 10 and steel pipe pile 50) that serves as a pile foundation in the ground using a winged steel pipe pile installation device 1 in order to improve the ground. Note that Fig. 7 omits the illustration of the hook member 30. Also, Fig. 9 omits the illustration of the multiple cutting blades 22 of the casing 20.

[0034] First, the upper end of the casing 20 is connected to a rotary press-in device (not shown) mounted on a heavy machine (not shown). That is, the casing 20 is driven and rotated by the rotary press-in device of the heavy machine. Then, with the pile connection portion 13 of the fin 10 inserted from the lower end opening 20b of the casing 20 into the space 24 defined by the large diameter area 23a of the inner circumferential surface 23, the casing 20 is rotated in the first rotation direction to bring the fin 10 into an engagement state in which it is engaged with the casing 20 side by the hook member 30. In the engagement state, the bottom surface of the lower end portion 20a of the casing 20 abuts against the upper surface of the central portion 11 of the fin 10, and the lower end opening 20b of the casing 20 is covered by the central portion 11 of the fin 10. This is the preparation action.

[0035] Based on the above configuration and preparatory actions, a winged steel pipe pile is installed using the winged steel pipe pile installation device 1 in the following manner.

[0036] The method for installing a winged steel pipe pile according to this embodiment includes a rotary pressing process, a connection process, a confirmation process, and a pull-out process.

[0037] First, as shown in FIG. 9(a), the casing 20 and the fins 10 in the locked state are rotated in a first rotation direction to be rotationally pressed into the ground (rotational pressing step).

[0038] Next, after the fin 10 reaches the desired position, the rotation of the casing 20 is stopped, and the steel pipe pile 50 is inserted into the pile insertion space 21 from the upper end opening 20c on the upper side of the casing 20, and the connection portion 50a of the steel pipe pile 50 is connected to the pile connection portion 13 of the fin 10 (connection step). In this embodiment, with the steel pipe pile 50 connected to the pile connection portion 13 of the fin 10, the relative rotation between the steel pipe pile 50 and the fin 10 is regulated by the engagement between the protrusion portion 51 of the steel pipe pile 50 and the opening 13a of the pile connection portion 13.

[0039] Next, as shown in FIG. 8, the check bar 40 is inserted into the pile insertion space 21 from the upper end opening 20c on the upper side of the casing 20, and the lower end 40a of the check bar 40 is attached to the upper end 52 of the steel pipe pile 50. Then, the casing 20 is rotated in the second rotation direction to check that the fin 10 does not rotate even when the casing 20 is rotated (checking step). The worker can check that the check bar 40 does not rotate by visually checking the upper end (e.g., head 41) of the check bar 40. This allows the worker to check that the casing 20 and the fin 10 are detached. At this time, when the casing 20 is rotated in the second rotation direction, the claw portion 32 of the hook member 30 in the normal position automatically detaches from the wing-like portion 12 of the fin 10, and the engagement of the fin 10 to the casing 20 side is released, resulting in a release state (see FIG. 6(a)). When the casing 20 is further rotated in the second rotation direction, and the hook member 30 in the released state in the normal position comes into contact with the upper surface 14 of the wing-like portion 12 of the fin 10 (see FIG. 6(b)), the tip side (claw portion 32 side) of the hook member 30 is tilted from the normal position to an avoidance position on the upper side in the first rotation direction around the hook rotation axis CL2 by the force from the wing-like portion 12 of the fin 10 (see FIG. 6(c)). In other words, the avoidance position is a position that is avoided from the rotation trajectory of the wing-like portion 12 of the fin 10. The confirmation rod 40 may be pulled out of the casing 20 after it is confirmed that the fin 10 is not rotating, or it may be automatically removed in the pulling out process as described below.

[0040] Next, as shown in FIG. 9(b), the casing 20 is rotated in the second rotation direction and pulled out from the ground while leaving the fins 10 and the steel pipe pile 50 (the steel pipe pile 50 connected to the fins 10) in the ground (pulling out process). During this pulling out process, soil is backfilled into the borehole formed in the rotary pressing process while rotating the casing 20 in the second rotation direction. When the casing 20 is rotated in the second rotation direction and moved upward, the upper end of the casing 20 is caught on the head 41 of the confirmation rod 40, so that the confirmation rod 40 is automatically removed in the pulling out process. The pulled out casing 20 can be reused.

[0041] As a result, the fin 10 left in the ground and the small diameter steel pipe pile 50 connected to it act as a steel pipe pile with wings.

[0042] In the winged steel pipe pile installation device 1 and the installation method for a winged steel pipe pile configured as described above, when the casing 20 is rotated in a first rotation direction with the pile connection portion 13 of the fin 10 inserted into the lower end opening 20b of the casing 20, the hook member 30 provided on the outer circumferential surface 61 of the lower end 20a of the casing 20 is brought into an engaged state in which it engages the wing-like portion 12 of the fin 10, and when the casing 20 is rotated in a second rotation direction, it is brought into a released state in which it releases the engagement of the fin 10. In this way, the casing 20 can be detached from the fin 10 with a simple structure in which the hook member 30 is provided on the outer circumferential surface 61 of the lower end 20a of the casing 20 and the casing 20 is rotated in the second rotation direction.

[0043] Furthermore, when the casing 20 is rotated in the second rotation direction, if the hook member 30 in the released state in the normal position abuts against the upper surface 14 of the wing-like portion 12 of the fin 10, the tip side of the hook member 30 is tilted to an avoidance position located above the normal position and at least one of the first rotation directions (upper and first rotation direction in this embodiment) about the hook rotation axis CL2 by the force from the wing-like portion 12 of the fin 10. In this way, even if the hook member 30 in the released state abuts against the upper surface 14 of the wing-like portion 12 of the fin 10 when the casing 20 is rotated in the second rotation direction, the hook member 30 in the normal position tilts in a direction that deflects the force from the fin 10 (at least one of the upper and first rotation directions). Therefore, the hook member 30 does not interfere with the rotation of the casing 20.

[0044] Furthermore, the wing-like portions 12 of the fin 10 are inclined with respect to a plane perpendicular to the rotation axis CL1 of the casing 20 so that the end portion on the first rotation direction side is located lower than the end portion on the second rotation direction side in the locked state, and thus excavation can be performed by the wing-like portions 12 of the fin 10 in the rotary press-fitting step. Furthermore, the hook rotation axis CL2 of the hook member 30 extends from the upper side toward the lower side in the first rotation direction when viewed from the radial direction of the casing 20, and is inclined with respect to the rotation axis CL1 of the casing 20, so that when the hook member 30 in the released state abuts against the upper surface 14 of the wing-like portions 12 of the fin 10, the hook member 30 can be tilted in a direction to deflect the force from the fin 10.

[0045] Furthermore, an inclined surface 33 is provided on the lower end of the claw portion 32 of the hook member 30 in the second rotation direction. The inclined surface 33 of the claw portion 32 is inclined with respect to a lower end edge 34 of the claw portion 32 and an end edge 35 of the claw portion 32 in the second rotation direction. Therefore, when the hook member 30 in the released state abuts against the upper surface 14 of the wing-like portion 12 of the fin 10, since the lower end of the claw portion 32 in the second rotation direction is the inclined surface 33, it is possible to prevent the claw portion 32 from getting caught on the upper surface 14 of the wing-like portion 12, and the hook member 30 can be tilted smoothly.

[0046] Furthermore, hook support portion 25 is disposed at a height position where it does not come into contact with wing-like portion 12 of fin 10, even when casing 20 is rotated with the bottom surface of lower end portion 20a of casing 20 in contact with the upper surface of central portion 11 of fin 10. Therefore, hook support portion 25 does not interfere with wing-like portion 12 of fin 10 when casing 20 is rotated in the second rotation direction, and therefore does not impede rotation of casing 20.

[0047] Therefore, according to this embodiment, the casing 20 can be detached from the fins 10 with a simple structure without interfering with the rotation of the casing 20.

[0048] In addition, the portion where the lower end edge of the connecting plate portion 25c of the hook support portion 25 and the edge of the lower plate portion 25b on the second rotation direction side intersect is chamfered to form an inclined surface 28 that is inclined with respect to the surface 26 on the second rotation direction side of the connecting plate portion 25c and the lower surface 27 of the lower plate portion 25b. Therefore, even if the wing-like portion 12 of the fin 10 is deformed (for example, deformed upward due to a force from soil below) and the hook support portion 25 comes into contact with the wing-like portion 12 of the fin 10 when the casing 20 is rotated in the second rotation direction, the portion where the lower end edge of the connecting plate portion 25c of the hook support portion 25 and the edge of the lower plate portion 25b on the second rotation direction side intersect is inclined surface 28, so that it is possible to prevent the hook support portion 25 from getting caught on the upper surface 14 of the wing-like portion 12.

[0049] The inner circumferential surface 23 of the casing 20 has a large diameter region 23a extending continuously upward from the lower end opening 20b, and a small diameter region 23b extending upward from the large diameter region 23a. The large diameter region 23a of the inner circumferential surface 23 of the casing 20 defines a space 24 that allows the insertion of the pile connection portion 13 of the fin 10, and the inner diameter (diameter) r2 of the small diameter region 23b of the inner circumferential surface 23 of the casing 20 is formed to be equal to or smaller than the inner diameter r3 of the pile connection portion 13 of the fin 10. Therefore, after the fin 10 reaches a desired position, the rotation of the casing 20 is stopped, and the steel pipe pile 50 is inserted into the pile insertion space 21 from the upper end opening 20c on the upper side of the casing 20, and the connection portion 50a of the steel pipe pile 50 is easily inserted into the pile connection portion 13 of the fin 10 in the connection process.

[0050] In addition, the lower end 40a of the confirmation rod 40 inserted into the pile insertion space 21 of the casing 20 is connected to the upper end 52 of the steel pipe pile 50 in the pile insertion space 21, so that the confirmation rod 40 rotates when the steel pipe pile 50 rotates and does not rotate when the steel pipe pile 50 does not rotate. Therefore, by inserting the confirmation rod 40 into the pile insertion space 21 from the upper end opening 20c on the upper side of the casing 20 and connecting the lower end 40a of the confirmation rod 40 to the upper end 52 of the steel pipe pile 50, it is possible to confirm that the fin 10 does not rotate even when the casing 20 is rotated in the second rotation direction. Therefore, in the extraction process, when the casing 20 is rotated in the second rotation direction and extracted from the ground, the fin 10 and the steel pipe pile 50 can be reliably left in the ground.

[0051] In this embodiment, the lower end 40a of the confirmation rod 40 for checking the rotation of the fin 10 is formed thin so that it can be inserted into the inner diameter portion of the upper end 52 of the steel pipe pile 50, but this is not limited to this, and the shape of the lower end 40a of the confirmation rod 40 can be various shapes that can be connected to the upper end 52 of the steel pipe pile 50.

[0052] In addition, in this embodiment, the upper end of the confirmation rod 40 is provided with a head 41 that protrudes in a direction intersecting the axial direction, but this is not limited to this, and the upper end of the confirmation rod 40 can be configured in a way that makes it easy to visually confirm the rotation of the confirmation rod 40 (for example, a pattern written on the surface of the confirmation rod 40).

[0053] In addition, in this embodiment, the confirmation rod 40 is provided as a rotation confirmation member for confirming that the fin 10 does not rotate when the casing 20 is rotated in the second rotation direction, but the confirmation rod 40 does not have to be provided. In addition, the installation method for the winged steel pipe pile according to this embodiment includes a confirmation step, but if the confirmation rod 40 is not provided, the confirmation step does not have to be included.

[0054] In addition, in this embodiment, the protrusion 51 is provided on the connection portion 50a of the steel pipe pile 50, the opening 13a in which the protrusion 51 can be locked is provided on the pile connection portion 13 of the fin 10, and the connection portion 50a of the steel pipe pile 50 and the pile connection portion 13 of the fin 10 are connected in a state in which the relative rotation between the steel pipe pile 50 and the fin 10 is restricted, but this is not limited to this. Various configurations can be applied to the connection mode between the connection portion 50a of the steel pipe pile 50 and the pile connection portion 13 of the fin 10.

[0055] In this embodiment, in order to facilitate the insertion of the steel pipe pile 50 into the pile connection portion 13 of the fin 10, the large diameter region 23a and the small diameter region 23b are provided on the inner peripheral surface 23 of the casing 20, and the inner diameter (diameter) r2 of the small diameter region 23b is formed to be equal to or smaller than the inner diameter r3 of the pile connection portion 13 of the fin 10, but this is not limited to this. For example, the inner diameter r3 of the pile connection portion 13 of the fin 10 may be made larger than the outer diameter of the casing 20, and the lower end portion 20a of the casing 20 may be inserted into the pile connection portion 13 of the fin 10.

[0056] In addition, in this embodiment, an inclined surface 33 is provided at the lower end of the claw portion 32 of the hook member 30 in the second rotation direction, and is inclined with respect to the lower edge 34 of the claw portion 32 and the second rotation direction edge 35 of the claw portion 32. However, for example, if there is no concern about the claw portion 32 getting caught on the upper surface 14 of the wing-like portion 12, it is not necessary to provide the inclined surface 33.

[0057] In this embodiment, the inclined surface 28 is provided at the portion where the lower end edge of the connecting plate portion 25c of the hook support portion 25 intersects with the end edge on the second rotation direction side of the lower plate portion 25b. However, the inclined surface 28 does not have to be provided.

[0058] In addition, in this embodiment, the hook member 30 is composed of the arm portion 31 and the claw portion 32, but this is not limited to this, and the hook member 30 may have any shape that is engaged when the casing 20 is rotated in a first rotational direction and released when the casing 20 is rotated in a second rotational direction.

[0059] In this embodiment, the tip side of the hook member 30 is tilted from the normal position to the avoidance position upward in the first rotation direction, but the tilt direction and the avoidance position are not limited to this, and it is sufficient that the tip side of the hook member 30 is tilted to an avoidance position located at least on one side of the upward and first rotation direction. For example, the tip side of the hook member 30 may be tilted from the normal position to the avoidance position upward, or the tip side of the hook member 30 may be tilted from the normal position to the avoidance position in the first rotation direction. In other words, the avoidance position may be a position avoided from the rotation trajectory of the wing-like portion 12 of the fin 10 by the force received from the wing-like portion 12.

[0060] Although the present invention has been described based on the above embodiment, the present invention is not limited to the contents of the above embodiment, and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, and operational techniques made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. [Explanation of symbols]

[0061] 1: Winged steel pipe pile installation device 10: Finn 11: Central part 12:Alar part 13: Pile connection 20: Casing 20a: Lower end (one end) of the casing 20b: Lower end opening of casing (one side opening) 21: Pile insertion space 23: Inner peripheral surface 23a: Large diameter area 23b: Small diameter area 24: Space 30: Hook member 31: Arm section 32: Claw part 33: Inclined surface 34: Lower edge of the claw (edge ​​on one side in a specified direction) 35: Edge of the claw in the second rotation direction 40: Confirmation rod (rotation confirmation part) 50: Steel pipe pile 61: Outer surface of casing

Claims

1. A hollow tubular casing extending in a predetermined direction and defining a pile insertion space into which a steel pipe pile can be inserted; a hook member provided on an outer peripheral surface of one end of the casing in the predetermined direction and supported by the casing so as to be tiltable about a predetermined hook rotation axis; A fin having a central portion covering one side opening of the one side of the casing, a pile connection portion protruding from the central portion to the other side in the predetermined direction and connectable to the steel pipe pile, and a wing-like portion extending outward from the central portion, and the fin is detachably supported on the casing via the hook member; The hook member is tiltable about the hook rotation shaft between a normal position in which the hook member extends from the hook rotation shaft side toward the radial outside of the casing and an avoidance position in which a tip side of the hook member is located on at least one side of the other side in the predetermined direction and the first rotation direction of the casing from the normal position, When the casing is rotated in the first rotation direction with the central portion of the fin covering the one side opening of the casing, the hook member in the normal position is in an engaged state in which the wing-like portion of the fin is engaged, and when the casing is rotated in a second rotation direction opposite to the first rotation direction, the hook member in the normal position is in an engaged state in which the wing-like portion of the fin is released from the engaged state, In the locked state, the fins rotate in the first rotation direction in association with the rotation of the casing in the first rotation direction, and in the released state, the fins do not rotate even when the casing is rotated in the second rotation direction, A winged steel pipe pile installation device in which, when the hook member in the released state abuts against the wing-like portion of the fin when the casing is rotated in the second rotation direction, the force from the fin causes the hook member to tilt from the normal position to the avoidance position around the hook rotation axis.

2. the wing-like portion of the fin in the locked state is inclined with respect to a plane perpendicular to the rotation axis of the casing such that an end portion of the wing-like portion of the fin in the first rotation direction is disposed on the one side in the predetermined direction relative to an end portion of the fin in the second rotation direction; The winged steel pipe pile installation device of claim 1, wherein the hook rotation axis of the hook member extends from the other side of the specified direction toward the first rotation direction of the one side of the specified direction when viewed from the radial direction of the casing, and is inclined with respect to the rotation axis of the casing.

3. the hook member has an arm portion that extends radially outward from the casing side in the normal position, and a claw portion that is bent from a tip of the arm portion toward the one side in the predetermined direction, A winged steel pipe pile installation device as described in claim 1 or claim 2, wherein the end of the claw portion of the hook member on one side in the specified direction and on the second rotation direction in the normal position is inclined with respect to the edge of the claw portion on one side in the specified direction and the edge of the claw portion in the second rotation direction.

4. The pile connection portion of the fin is formed in a cylindrical shape that allows insertion of the end portion of the steel pipe pile in the predetermined direction, an inner circumferential surface of the casing has a large diameter region extending from the one side opening to the other side in the predetermined direction, and a small diameter region formed to have a smaller diameter than the large diameter region and extending from the large diameter region to the other side in the predetermined direction, The large diameter region of the inner circumferential surface of the casing defines a space that allows insertion of the pile connection portion of the fin, The winged steel pipe pile installation device according to claim 1 , wherein a diameter of the small diameter region of the inner circumferential surface of the casing is formed to be equal to or smaller than an inner diameter of the pile connection portion.

5. A rotation confirmation member is provided which is inserted into the pile insertion space from the other side in the predetermined direction of the casing and is removably supported on the other end of the steel pipe pile in the predetermined direction in a state where the steel pipe pile is inserted into the pile insertion space, The other end of the rotation confirmation member in the predetermined direction is exposed to the other side in the predetermined direction from the pile insertion space of the casing with the rotation confirmation member supported by the steel pipe pile, A winged steel pipe pile installation device as described in any one of claims 1 to 4, wherein the rotation confirmation member supported by the steel pipe pile rotates when the steel pipe pile rotates and does not rotate when the steel pipe pile does not rotate.

6. A method for installing a winged steel pipe pile using the winged steel pipe pile installation device according to any one of claims 1 to 4, a rotary press-in process of rotating the casing and the fins in the engaged state in the first rotation direction to rotary-press them into the ground; A connection process in which, after the fin reaches a desired position, the rotation is stopped, the steel pipe pile is inserted into the pile insertion space from the other side of the casing, and the steel pipe pile is connected to the pile connection portion of the fin; and an extraction process of rotating the casing in the second rotation direction and extracting it from the ground while leaving the fin and the steel pipe pile in place.

7. A method for installing a winged steel pipe pile using the winged steel pipe pile installation device according to claim 5, a rotary press-in process of rotating the casing and the fins in the engaged state in the first rotation direction to rotary-press them into the ground; A connection process in which, after the fin reaches a desired position, the rotation is stopped, the steel pipe pile is inserted into the pile insertion space from the other side of the casing, and the steel pipe pile is connected to the pile connection portion of the fin; A confirmation process in which the rotation confirmation member is inserted into the pile insertion space from the other side of the casing and attached to the steel pipe pile, and then the casing is rotated in the second rotation direction to confirm that the fin does not rotate even when the casing is rotated; and an extraction process of rotating the casing in the second rotation direction and extracting it from the ground while leaving the fin and the steel pipe pile in place.

Images