JP7274697B1 - Rotating buried tip enlarged wing pile - Google Patents

Abstract

[Problem] In conventional piles, since spiral blades protrude in a spiral shape on the outer periphery near the tip of the shaft pipe, when the pile is penetrated into the ground, the excavated soil around the shaft pipe is pushed into the outer peripheral surface of the shaft pipe. There is a risk that stable pile holding cannot be realized by being loosened or disturbed by the protruding part from the empty pile. SOLUTION: The present invention comprises a cylindrical pile main body, a cylindrical excavating blade erected on the tip side axial center of the cylindrical pile main body, and rotatable along the outer periphery of the cylindrical piling blade via a rotary connector. and a plurality of expansion wings disposed on the surface of each expansion wing, each expansion wing has a propulsion wing inclined downward on the forward rotation direction side, and each expansion wing has a part on the forward rotation direction side In a state in which a part of the other expansion wing on the reverse direction side is covered and rotates in the normal direction, each expansion wing is entirely housed within the outer diameter of the rotary-embedded tip expansion wing pile and rotates in the reverse direction. is a rotating embedded tip expanding wing pile characterized in that a part of each expanding wing protrudes outside the outer diameter of the rotating embedded tip expanding wing pile. [Selection drawing] Fig. 9

Description

The present invention relates to a rotating buried tip enlarged wing pile, more specifically, an enlarged wing that penetrates into the ground by rotating in one direction around the axis, and when it is penetrated and buried to a desired ground, rotates in the opposite direction to protrude from the ground. The present invention relates to a rotating buried tip expanded wing pile that can be firmly erected on the ground by increasing the bearing capacity and the like.

As a construction method for embedding steel pipe piles in the ground, there are driving methods using various hammers and the like. In this driving method, the rear end (head) of the pile is hit with a hammer until the tip of the pile reaches the bearing layer, so the vibration and noise associated with the hitting of the pile can cause damage, especially in densely populated residential areas. In some cases, construction is difficult. Therefore, the rotary penetration method is preferably used. In this rotary penetration method, a steel pipe pile having a steel piece such as a spiral blade on the outer peripheral surface of the lower end is placed on the ground, and the steel pipe pile is pushed into the ground while rotating. It is embedded.
Patent document 1 is mentioned as an example of the document regarding the steel pipe pile used by such a rotary penetration method.

The invention according to Document 1 comprises a steel shaft tube having at least one helical blade spirally protruding from the outer periphery near the tip and at least one notch formed at the tip, and an outer diameter of the shaft tube. A steel pipe pile having a slightly smaller diameter, a bottom plate fixed to the tip, and an inner pipe inserted into the shaft pipe with the bottom plate facing the tip side of the shaft pipe. It is possible to improve the tip support force.

JP 2003-176536

However, in the invention according to Document 1, since the helical blades are protruding spirally from the outer periphery near the tip of the steel pipe shaft pipe, when the shaft pipe is penetrated into the ground, the excavated soil around the shaft pipe When the tube is penetrated into the ground, the frictional force on the outer peripheral surface of the axial tube cannot be sufficiently effectively secured because the protruding portion from the outer peripheral surface of the tube loosens or disturbs the tube. For this reason, the shaft tube wobbles, and stable pile holding cannot be achieved.

Therefore, the present invention penetrates into the ground by rotating in the forward direction in one direction around the axis, and when the ground is penetrated and embedded to the desired ground, the expanding wings projecting by rotating in the reverse direction in the opposite direction increase the ground bearing force. To provide a rotating buried tip enlarged wing pile that can be firmly secured to the ground by reinforcing it.

The invention of claim 1 is a rotating embedded tip expanding wing pile that penetrates into the ground by rotating in the normal direction, comprising a cylindrical pile main body and a cylindrical excavating blade erected at the tip side axial center of the cylindrical pile main body. , and a plurality of enlarging wings rotatably arranged along the outer periphery of the cylindrical excavating blade via a rotating connector, and the surface of each enlarging wing is inclined downward in the normal rotation direction. Propulsion blades are protruded, and each expansion wing has a part on the forward rotation side covered with a part of the other expansion wing on the reverse rotation direction side, and in a state of rotating in the normal rotation direction, all of each expansion wing is accommodated within the outer diameter of the rotary embedded tip enlarged wing pile, and in a state of rotating in the reverse direction, a part of each enlarged blade protrudes outside the outer diameter of the rotary embedded tip enlarged wing pile. It is a buried tip expanded wing pile.

The invention of claim 2 is the rotary embedded tip enlarged wing pile according to claim 1, characterized in that a stopper is provided on the tip side of the rotary embedded tip enlarged wing pile or on the surface of the enlarged wing.

The invention of claim 3 is the rotating embedded tip expansion wing pile according to claim 1 or claim 2, characterized in that a part of the expansion wing on the reverse direction side is bent outward. be.

ADVANTAGE OF THE INVENTION According to the rotary embedded tip enlarged wing pile of the present invention, the following effects can be mainly exhibited.

Under the state in which the main body of the rotary-buried tip expanded wing pile has been penetrated into the ground to a predetermined depth by rotating in one direction, by rotating in the opposite direction to the time of penetration into the ground, the expanded wing is Since it protrudes radially outward from the outer peripheral edge of the tip of the pile body, the rotating buried tip enlarged wing pile body penetrated into the ground is rotated in the opposite direction to the time of penetration into the ground. By performing simple work, the contact area of the tip of the pile body with the excavated soil excavated by the excavated fragments is the surface area of the protruding part of the rotating member from the outer peripheral edge of the tip of the pile body. increases favorably.

Under the state of penetrating into the ground, both the outer peripheral surface frictional force and the contact area between the tip of the pile body and the excavated soil can be secured at a sufficient size, and the entire outer peripheral surface of the pile body can be secured. Both the bearing force exerted at the tip of the pile body and the tip bearing force exerted at the tip of the pile body can be effectively enhanced. As a result, it is possible to more stably and reliably support the upper load, and thus, for example, when used as foundation piles for houses, etc., uneven settlement of such houses, etc. occurrence can be prevented more effectively. Moreover, troublesome work is not forced to obtain such an effect of increasing the supporting force.

When the rotary-buried tip enlarged wing pile body is rotated in one direction and penetrated into the ground, the plurality of rotating members (enlarging wings) and the cylindrical excavating blades move along the outer peripheral edge of the tip of the pile body. Since it is housed radially inside the pile body and is arranged so as not to protrude from the outer peripheral edge of the tip of the pile body, for example, when the pile body rotates in one direction, such a protruding part will be a stone in the ground. It is possible to effectively prevent misalignment (horizontal error) in which the piling position is shifted from the initially set piling position due to contact with an obstacle such as the piling.

Since the plurality of rotating members (expansion wings) are accommodated inside the outer peripheral edge of the tip of the rotation-buried tip expansion wing pile body by rotating in the axial direction, for example, during transportation, etc., By arranging a plurality of rotating members (enlarged wings) in such an inwardly accommodated position, it does not become bulky when carrying a large number of items at once, and excellent handleability can be advantageously exhibited. be done.

It is a perspective view which shows the mounting state of a cylindrical pile main body and a tip plate. Fig. 2 is a plan view of the tip plate; Fig. 2 is a side view of a tubular digging edge; It is a bottom view of a cylindrical digging edge. It is the figure which looked at the expansion wing from the surface side. It is the figure which looked at the expansion wing provided with the bending part from the surface side. It is the figure which looked at the rotary buried tip expansion wing pile from the tip. It is a figure of the state where the expansion wing by the side of the tip of the rotary buried tip expansion wing pile has contracted, (a) is a side view, and (b) is a partially transparent view seen from the rear end side. It is a figure of the state where the expansion wing of the tip side of the rotary buried tip expansion wing pile was expanded, (a) is a side view, (b) is a partially perspective view seen from the rear end side. FIG. 4 is a partial perspective view showing the positional relationship of each expansion wing viewed from the rear end side of the rotary-buried tip expansion wing pile.

A rotating embedded tip enlarged wing pile (hereinafter, sometimes simply referred to as a "pile") 1 of the present invention is embedded in the ground with a pile diameter of 1 by rotating in the forward rotation direction A, and by rotating in the reverse direction B, the pile By expanding the expanding wings 50 at the support layer reaching one tip, the ground bearing capacity can be enhanced.

Specifically, at a place where one pile is driven in the ground, by rotating in the forward rotation direction A that forms one direction around the axis, the cylindrical excavation blade 30 excavates the ground while maintaining the width of the outer diameter 1o of the pile 1 diameter. When it is penetrated and embedded to the desired ground, the tip support force and frictional force (outer peripheral surface friction Provided is a rotating buried tip expanded wing pile 1 for firmly coping with pile work in the ground, especially in soft ground, etc., by the action of horizontal and vertical forces.

As shown in each figure, the rotating embedded tip enlarged wing pile 1 of the present invention includes a cylindrical pile body 10, a tip plate 20, a tubular excavating blade 30, a rotary connector 40, and a propelling blade 60. Wings 50 and the like are combined together. Hereinafter, each embodiment of the rotating embedded tip enlarged wing pile 1 of the present invention will be described.

The cylindrical pile main body 10 is a long cylindrical tubular body having a cavity 13 inside. As the cylindrical pile body 10, a steel pipe pile can be mentioned, but in addition, PC pile (prestressed concrete pile), PHC pile (high strength prestressed concrete pile), PRC pile (prestressed reinforced concrete pile), SC pile (concrete with outer shell steel pipe) piles) and other concrete piles. Moreover, it may be a single pile or a joint pile. Moreover, the length, inner diameter, outer diameter, etc. of the cylindrical pile main body 10 are not limited.

A tip plate 20 is provided on the tip side X of the cylindrical pile body 10 (see FIG. 1). This tip plate 20 is a disc-shaped member (steel disc) with a hole 22 drilled at the center position, and has an outer diameter 20 о that matches the outer diameter 10 о of the cylindrical pile body 10, and the tip of the cylindrical pile body 10 It is attached to the surface 11 by welding or the like. The cavity 13 of the cylindrical pile body 10 and the hole 22 of the tip plate 20 are communicated.

The outer diameter 20' of the tip plate 20 and the outer diameter 10' of the cylindrical pile body 10 are preferably the same or substantially the same, but even if the outer diameter 20' of the tip plate 20 is smaller than the outer diameter 10' of the cylindrical pile body 10 Well, therefore, for example, the structure which fixes the tip plate 20 in the cavity 13 (inner wall surface) of the cylindrical pile main body 10 may be sufficient.

In addition to the configuration in which the cylindrical pile body 10 and the tip plate 20 are separate members and the tip plate 20 is fixed to the tip surface 11 of the cylindrical pile body 10, the cylindrical pile body 10 and the tip plate 20 are integrally molded. good too. Further, if the tubular excavating edge 30 and the expanding wing 50 can be provided on the tip surface 11 of the cylindrical pile main body 10, the tip plate 20 may not be provided.

The material of the tip plate 20 may be any material, such as steel, as long as it has high durability. Moreover, the wall thickness, the inner diameter of the hole, etc. are not limited.

A cylindrical excavating edge 30 is provided at the tip side X-axis center of the cylindrical pile main body 10 . Specifically, the cylindrical digging blade 30 is erected from the axis of the surface 21 of the tip plate 20 . The cylindrical excavating blade 30 is provided via the tip plate 20, and as described above, the cylindrical excavating blade 30 is erected directly from the axis of the tip surface 11 of the cylindrical pile body 10 without the tip plate 20 interposed therebetween. may

As shown in FIG. 3 and the like, this tubular excavating blade 30 is a tubular body having a sawtooth-shaped blade portion 33 at its tip and a cavity 39 inside. It can be divided into two parts, and excavates the ground mainly by the blade portion 33 . In each figure, a cylindrical cylinder is used for explanation.

The blade portion 33 is configured by combining a plurality of mountain-shaped peak blade portions 37 and valley-shaped valley blade portions 38 . The blade portion 33 may have any shape and configuration as long as the blade portion 37 and the valley blade portion 38 are repeatedly combined. Therefore, since the height of the mountain edge portions 37 and the depth, number, angle, shape, etc. of the valley edge portions 38 do not matter, the height of each mountain edge portion 37 may be substantially the same or uneven. . Moreover, although not shown, the ridge portion 37 and the trough portion 38 may be formed in a serrated shape.

The tubular digging blade 30 (main body 31) has an inner diameter 30i that substantially matches the inner diameter 20i of the hole 22 of the tip plate 20, and the tubular digging blade 30 (main body 31) is attached to the edge (surface 21) of the hole 22 of the tip plate 20. A main body 31) is attached by welding or the like. The cavity 13 of the cylindrical pile body 10, the hole 22 of the tip plate 20 and the cavity 39 of the tubular excavating blade 30 are communicated.

The inner diameter 20i of the hole 22 of the tip plate 20 and the inner diameter 30i of the cavity 39 of the tubular digging blade 30 (main body 31) are preferably the same or substantially the same diameter, but the inner diameter 30i of the cavity 39 of the tubular digging blade 30 is larger than the tip plate. It may be larger than the inner diameter 20i of the hole 22 of 20 . Also, the inner diameter 30i of the cavity 39 of the tubular digging blade 30 may be smaller than the inner diameter 20i of the hole 22 of the tip plate 20 . Therefore, for example, the tubular digging blade 30 (the outer periphery 35 of the main body 31) may be fixed inside the hole 22 (inner wall surface) of the tip plate 20. As shown in FIG.

In addition to the configuration in which the tubular excavation blade 30 and the tip plate 20 are separate members and the tubular excavation blade 30 is fixed to the surface 21 of the tip plate 20, there is also a configuration in which the tubular excavation blade 30 and the tip plate 20 are integrally formed. There may be.

The cylindrical excavating blade 30 may be made of any material such as steel, as long as it has high excavating properties and durability. Also, the length, inner diameter, outer diameter, etc. are not limited. The cylindrical excavating blade 30 may have a cylindrical shape as shown in each drawing, or may have a polygonal shape such as a triangular, quadrangular, pentagonal, or hexagonal shape (not shown). The number, shape, etc. of the expanding blades 50 are adapted according to the shape of the tubular excavating blade 30 .

On the tip end side X of the cylindrical pile body 10, an enlarged wing 50 having a propulsion wing 60 is rotatably arranged. The expanding blade 50 is rotatably supported along the outer circumference 35 of the cylindrical digging blade 30 via a rotary coupling 40, and is contracted when rotated in the forward rotation direction A (FIGS. 7 and 8). 8(b)), and the rotation in the reverse direction B results in an enlarged state (see FIG. 9(b)).

The expansion wing 50 is a curved steel plate with a predetermined thickness. The shape of each expansion wing 50 is such that when each expansion wing 50 is contracted, the entire expansion wing 50 surrounds the outer circumference 35 of the tubular excavating blade 30 , in other words, wraps around the main body 31 of the tubular excavating blade 30 . Any shape may be used as long as it is possible, and shapes other than those illustrated in FIG. 5 and the like may be used. Although not shown, each enlarging wing 50 may be chamfered at the corners and end faces of the forward rotation side 50f or at the corners and end faces of the reverse rotation direction side 50r. By performing such chamfering, each expansion wing 50 can be expanded or contracted smoothly without being caught.

The enlarging wings 50 are arranged in plural. In FIG. 7 and the like, four expansion wings, specifically, a first expansion wing 51, a second expansion wing 52, a third expansion wing 53, and a fourth expansion wing 54, are arranged. 50 may be two, three, or five or more. In terms of stability, three or more piles are desirable because the stabilizing force applied to the tip 5 of the pile 1 increases. It goes without saying that the length of each expansion wing 50 in the longitudinal direction differs depending on the number of expansion wings 50 arranged. In the present embodiment, a more desirable example of four sheets will be described.

The first to fourth expansion wings 51 to 54 are arranged at equal intervals along the outer circumference 35 of the tubular digging edge 30 (the outer circumference of the tip plate 20). In FIG. 7, the first expansion wing 51 and the third expansion wing 53 are arranged diagonally, and the second expansion wing 52 and the fourth expansion wing 54 are arranged diagonally.

An imaginary line C1 connecting the end of the reverse direction side 51r of the first propeller blade 61 to the end of the reverse direction side 53r of the third propeller blade 63, and the end of the reverse direction side 52r of the second propeller blade 62 to the end of the reverse direction side 54r of the fourth propeller blade 64 to form a cross (see FIG. 10). In this way, it is desirable that the first to fourth expansion wings 51 to 54 are evenly arranged in a well-balanced manner.

In the contracted state of the expansion wings 50 when the rotary-buried tip expansion wing pile 1 penetrates into the ground, the expansion wings 50 are partially overlapped with each other. is covered with a part of the reverse direction side 50r of the other expanding wing 50. As shown in FIG. Specifically, according to FIG. 7 , which is a view of the rotary-buried tip expansion wing pile 1 viewed from the tip 5 , a part of the forward rotation direction side 51 f of the first expansion wing 51 is the reverse rotation direction side of the fourth expansion wing 54 . A portion of the forward rotation side 52f of the second expansion wing 52 is covered with the reverse rotation side 51r of the first expansion wing 51, and a part of the forward rotation side 53f of the third expansion wing 53 is covered with A part of the forward rotation side 54 f of the fourth expansion wing 54 is covered with the reverse rotation side 53 r of the third expansion wing 53 . In this manner, the first to fourth expanding blades 51 to 54 that are partially overlapped are arranged like a windmill.

Further, when each expansion wing 50 is contracted, the first expansion wing 51 to the fourth expansion wing 54 are supported in an inclined state so as to lean against the cylindrical digging blade 30 . The upper end 50t of the expanding wing 50 comes into contact with or faces the outer circumference 35 of the tubular digging blade 30. As shown in FIG. Specifically, the upper end 51t of the first expanding wing 51 abuts or faces a part of the outer circumference 35 of the tubular excavating blade 30, and the upper end 52t of the second expanding wing 52 35, the upper end 53t of the third enlarging wing 53 abuts or faces a part of the outer circumference 35 of the tubular digging blade 30, and the upper end 54t of the fourth enlarging wing 54 is in contact with or confronting a part of the outer circumference 35 of the tubular excavating blade 30. abuts or faces a portion of the outer circumference 35 of the shaped digging edge 30 . Thus, the position where the upper end 50t of the expanding wing 50 abuts or faces the outer circumference 35 of the tubular digging blade 30 is the range in which the expanding wing 50 is contracted the most. When each expansion wing 50 is contracted, each expansion wing 50 is accommodated within the width of the outer diameter 1o of the pile 1 diameter and does not protrude beyond the outer diameter 1o of the pile 1 diameter.

Although the enlarging wing 50 is curved inward as a whole, it may be a bent portion 50z in which a part of the reverse direction side 50r is bent outward (see FIG. 6). By forming the bent portion 50z in the expansion wings 50, a space is interposed between the expansion wings 50 when the expansion wings 50 are contracted. Specifically, a space is provided between the bent portion 51z of the first expansion wing 51 and the forward rotation direction side 52f of the second expansion wing 52, and the bent portion 52z of the second expansion wing 52 and the third expansion wing 52 are separated from each other. A space is interposed on the forward rotation direction side 53f of the expansion wing 53, and a space is interposed between the bent portion 53z of the third expansion wing 53 and the forward rotation direction side 54f of the fourth expansion wing 54. A space is interposed between the bent portion 54z of the expanding blade 54 and the forward rotation direction side 51f of the first expanding blade 51 . When rotating the rotary-buried tip expanding wing pile 1 in the reverse direction B, the expanding wing 50 can be expanded by the ground (excavated soil) entering from each of these spaces, so that the expanding wing 50 can be expanded with less force. can be expanded.

A propulsion wing 60 formed in an arc shape (substantially crescent shape) in plan view protrudes from the surface 50a of each expansion wing 50 . Specifically, a first propeller wing 61 protrudes from the surface 51a of the first expansion wing 51, and a second propeller wing 62 protrudes from the surface 52a of the second expansion wing 52. A surface 53a of the third expanding wing 53 is provided with a third propelling blade 63, and a surface 54a of the fourth expanding wing 54 is provided with a fourth propelling blade 64. As shown in FIG. The propulsion blade 60 may have a shape other than an arc shape (substantially crescent shape) in a plan view, and a shape different from the shape shown in each figure may be selected in consideration of the penetrability and propelability of the pile 1 with respect to the ground.

The propulsion blade 60 provided in the expansion wing 50 has a first working surface 60a and a second working surface 60b behind the first working surface 60a. Specifically, the first propulsion wing 61 provided in the first expanding wing 51 has a first working surface 61a, and the second working surface 61b is provided on the back side of the first working surface 61a. The second propulsion wings 62 provided in the second expansion wings 52 are provided with a first working surface 62a and a second working surface 62b behind the first working surface 62a. A third propulsion wing 63 provided in the third expanding wing 53 has a first working surface 63a and a second working surface 63b behind the first working surface 63a. A fourth propulsion wing 64 provided on the fourth expanding wing 54 has a first working surface 64a and a second working surface 64b behind the first working surface 64a. The propulsion blade 60 may have any length in the longitudinal direction or height in the width direction, as long as it can propel the rotation of the rotary embedded tip enlarged wing pile 1 in the forward rotation direction A or in the reverse rotation direction B. do not have.

The propeller blades 60 are fixed to the surface 50a of the expansion wing 50 by welding or the like, and may be provided perpendicular to the surface 50a of the expansion wing 50, or may be provided at an angle.

As shown in FIGS. 5 and 6, the propulsion blades 60 are inclined so that the forward rotation direction side 60f forming one direction around the axis of the expansion blades 50 is downward. Practically, it is desirable to incline downward from the horizontal by, for example, 20° to 60°, generally 30° or 45°. In addition, if the propeller blade 60 can propel the rotation in the forward rotation direction A or the rotation in the reverse rotation direction B of the rotationally buried tip enlarged wing pile 1, the arrangement angle and the like do not matter.

The first propeller blades 61 to the fourth propeller blades 64 as a whole are arranged in a helical shape when viewed from the tip end 5 of the rotating embedded tip expander pile 1 in a state where each expansion blade 50 is contracted. Each propelling blade 60 protrudes like a flange from the surface 50 a of each expanding blade 50 . It is configured so that it does not protrude from the diameter 1o) and fits within 1 diameter of the pile (within 1o outside diameter).

When the rotating embedded leading end expanding wing pile 1 is viewed from the side with the expanding wings 50 contracted, the positional relationship of the propelling wings 60 may be the same or different. That is, the first to fourth expansion wings 51 to 54 may all be in the same position. Further, the second propelling wings 62 provided on the second expanding wings 52 may be higher than the first propelling wings 61 provided on the first expanding wings 51, and the third propelling wings provided on the third expanding wings 53 may be higher. The fourth propelling wings 64 provided on the fourth expanding wings 54 may be higher than the third propelling wings 63 .

The material of the propulsion blades 60 may be any material such as steel, as long as it has high excavability and durability. In addition to the configuration in which the expansion wing 50 and the propelling wing 60 are separate members and the propelling wing 60 is fixed to the surface 50a of the expanding wing 50, the expansion wing 50 and the propelling wing 60 may be integrally molded. .

In this way, in the state in which each expansion blade 50 is contracted, the first expansion blade 51 to the fourth expansion blade 54 at the tip 5 of the rotating embedded tip expansion blade pile 1 are arranged in a windmill shape, and the first 61 to 64 are spirally arranged (see FIG. 7).

An enlarged wing 50 is connected to the tip end side X of the rotating embedded tip enlarged wing pile 1 via a rotary connector 40 . Specifically, the expansion wing 50 expands in the expansion direction (outer diameter direction OD) with the support shaft 48 of the rotation coupling 40 as the fulcrum, and also expands in the contraction direction with the support shaft 48 of the rotation coupling 40 as the fulcrum. (Axial direction AX).

The rotary connector 40 may have any structure as long as the expansion wings 50 are rotatably connected. Therefore, connecting members such as hinges and hinges may be used as long as there is no problem in durability. An example of an embodiment of the pivotal coupling 40 will be described below.

A rib 41 protrudes from the lower outer circumference 35 of the tubular digging edge 30 . Any number of ribs 41 may be provided for one enlarged wing 50 . Therefore, as shown in FIG. 8(b) or FIG. 9(b), one expanding wing 50 may be provided with two, or although not shown, may be provided with one or a plurality of three or more. good. A hole for inserting a support shaft 48 is bored in the tip side of each rib 41 .

On the other hand, the rear surface 50b of the expansion wing 50, specifically, the rear surface 51b of the first expansion wing 51, the rear surface 52b of the second expansion wing 52, the rear surface 53b of the third expansion wing 53, and the fourth expansion wing 54 A rib 46 is fixed on the rear surface 54b of the . These ribs 46 are fixed to the rear surface 51b of the first expansion wing 51, the rear surface 52b of the second expansion wing 52, the rear surface 53b of the third expansion wing 53, and the rear surface 54b of the fourth expansion wing 54. A configuration in which a base 49 is provided and one end side of the rib 46 is fixed to this base 49 may be employed. A hole for inserting a support shaft 48 is drilled in the tip side of each rib 46 .

The hole of the rib 46 fixed to the back surface 50b of the enlarging wing 50 is aligned with the hole of the rib 41 protruding from the cylindrical digging blade 30, and by inserting the support shaft 48 into both holes, the expansion is performed using the support shaft 48 as a fulcrum. The wing 50 becomes rotatable. The support shaft 48 may have any configuration. For example, reinforced bolts, cemented carbide bolts, etc. may be used. As for the bolts, it is desirable to use a half thread that does not have an effective thread.

As another configuration (not shown), for example, a first clamping plate and a second clamping plate having a hole for inserting the support shaft 48 are provided on the rear surface 50b of the expansion wing 50, and the first clamping plate The rib 46 fixed to the rear surface 50b of the expanding wing 50 is arranged between the and second holding plate, the hole of the rib fixed to the expanding wing 50 is aligned with the hole of the first holding plate and the second holding plate, and each hole is By inserting the support shaft 48, the expansion wing 50 can rotate freely with the support shaft 48 as a fulcrum.

In this manner, the expanding wing 50 is rotatably supported via the pivotal connector 40 , specifically, by the support shaft 48 of the pivotal connector 40 . That is, when rotating in the forward rotation direction A, the expanding blade 50 rotates in the axial direction AX, that is, toward the cylindrical excavating blade 30, so that the expanding blade 50 is entirely within the outer diameter 1o of the pile 1. In the state of rotating in the reverse direction B, the expansion wing 50 rotates in the direction of the outer diameter 1o of the pile 1, so that a part of the expansion wing 50 moves outside the outer diameter 1o of the pile 1. It is in a protruded state. When the expansion wing 50 is in the expanded state, a part of the expansion wing 50 may overlap with a part of the other expansion wing 50 as shown in FIG. 9(b).

The surface 50a of the enlarging wing 50, which is enlarged by the rotation in the reverse direction B which is the opposite direction around the axis, abuts against the tip surface 11 of the cylindrical pile body 10, etc., and the tip surface 11, etc. serve as a stopper. Become. Therefore, the maximum expansion range of the expansion wings 50 is the position where the stopper stops.

As a stopper, for example, the tip outer peripheral edge of the cylindrical pile main body 10 can be used as a projecting annular portion 12, and this projecting annular portion 12 can be used as a stopper. Specifically, according to the configuration in which the tip plate 20 is provided in the cavity 13 of the cylindrical pile main body 10 , the projecting annular portion 12 is formed at the tip outer peripheral edge of the cylindrical pile main body 10 . The height of the projecting annular portion 12 does not matter. Therefore, the opening angle of the expanding wings 50 can be adjusted by the height of the projecting annular portion 12 .

In addition, a separate stopper (not shown) may be provided on the surface 50a of the expanding wing 50. FIG. Specifically, the stopper is fixed to the surface 50a of the expansion wing 50 by welding or the like so as to protrude from the surface 50a of the expansion wing 50 . The shape, length, height, etc. of the stopper do not matter. Therefore, the opening angle of the expanding wings 50 can be adjusted by adjusting the height of the stopper.

Further, a stopper may be provided at the outer circumference 35 of the tubular digging blade 30, specifically at a position where the upper end 50t of the expansion wing 50 abuts. By providing this stopper, it is possible to adjust the minimum contraction range of the expansion wings 50 .

An example of how to use the rotating embedded tip enlarged wing pile 1 of the present invention will be described. First, at an excavation point of the ground where the rotary buried tip enlarged wing pile 1 is to be penetrated, a predetermined construction machine (not shown) is used to place the tip 5 of the rotary buried tip enlarged wing pile 1 on the ground. upright on the In addition, in order to determine the driving position of the pile 1, a tubular end support (not shown) is mainly used. Specifically, a tip support is installed at the driving position, and the tip 5 of the rotating embedded tip enlarged wing pile 1 is inserted into the cavity of the tip support and rotated. As a result, the pile core of the rotationally buried tip enlarged wing pile 1 can be aligned with the driving position. Of course, other well-known pile centering may be used.

After that, a rotating force is applied to the rotary embedded tip enlarged wing pile 1 in the forward rotation direction A shown in FIG. is integrally rotated clockwise together with the tubular digging blade 30 . As a result, while the ground is being excavated by the tubular excavating blade 30 , the rotating embedded tip-expanding wing pile 1 is gradually penetrated into the ground from the tip 5 side. That is, by rotating the rotary embedded tip enlarged wing pile 1 in the forward rotation direction A that is one direction around the axis, the ground is excavated by the tubular excavating edge 30 or the like protruding from the tip 5 of the rotary embedded tip enlarged wing pile 1. Excavation is carried out, and as a result, the rotating embedded tip enlarged wing pile 1 penetrates deep into the ground.

When the ground is excavated by rotation in the forward rotation direction A around the axis, that is, when each expansion wing 50 is contracted, the adjacent first expansion wing 51 to fourth expansion wing 54 are in the other expansion state. It penetrates into the ground while maintaining a state partially covered by the wing 50. In this state, all of the first expanding wing 51 to the fourth expanding wing 54 have an outer diameter of 10° of the cylindrical pile main body 10. It is maintained in a position stowed inwards.

It is embedded in the ground by applying resistance (stress) by rotating in the forward rotation direction A which is one direction around the axis. Specifically, the first action surface 61a (gradually from the forward rotation direction side 61f) of the first propelling blade 61 provided on the first expanding blade 51, the second propelling blade provided on the second expanding blade 52 A first acting surface 62a of the blade 62 (gradually from the forward rotation direction side 62f), and a first acting surface 63a of the third propelling blade 63 provided in the third expansion wing 53 (gradually from the forward rotation direction side 63f) , Resistance (stress) is applied to the first action surface 64a (gradually from the forward rotation direction side 64f) of the fourth propulsion blade 64 provided in the fourth expansion wing 54, and the rotary buried tip expansion wing pile 1 is placed on the ground. Buried.

Then, when the rotary embedded tip enlarged wing pile 1 is buried to the desired ground (supporting layer), this time, the rotary embedded tip enlarged wing pile 1 is moved in the opposite direction around the axis by a rotary drive device provided in the construction machine. By rotating B, that is, counterclockwise, the expanding wing 50 protrudes from the pile 1 diameter. That is, the expanding wings 50 are penetrated and buried in the ground (wall surface), and the supporting force of the ground can be enhanced by the expanding wings 50 .

Rotation in the reverse direction B, which is the opposite direction about the axis, causes resistance (stress) to be applied, and the spreader wings 50 move to spread outward to open the petals and enter the spread state. Specifically, the second action surface 61b (gradually from the reverse direction side 61r) of the first propelling blade 61 provided on the first expanding blade 51, the second propelling blade provided on the second expanding blade 52 62 (gradually from the reverse direction side 62r), the second action surface 63b (gradually from the reverse direction side 63r) of the third propeller blade 63 provided in the third expansion wing 53, the fourth Resistance (stress) is applied to the second action surface 64b (gradually from the reverse direction side 64r) of the fourth propelling wing 64 provided in the expanding wing 54 of the above, and as a result, the first expanding wing 51 to the fourth expanding wing 54 protrudes outward in the radial direction of the pile 1 from the outer diameter 1? In other words, the expansion wing 50 penetrates into the ground in a contracted state, and from this contracted state, expands to increase the ground bearing force.

By rotating the rotary-buried tip expanding wing pile 1 in the reverse direction B in this way, the expanding wing 50 protrudes, and when the expanding wing 50 is penetrated and embedded in the ground wall surface, the rotating drive device provided in the construction machine rotates. The rotary buried tip enlarged wing pile 1 is removed to complete the construction.

Since the rotating embedded tip enlarged wing pile 1 of the present invention is a pile 1 used in a rotary penetration method rather than a driving method, there is no vibration or noise during construction. In addition, construction is possible even in soft ground such as reclaimed ground containing a lot of groundwater and saturated loose sandy ground. Therefore, it can be used in a wide variety of fields in the field of foundation work for construction and civil engineering.

A frictional force (outer peripheral surface frictional force) acts on the surface of the outer periphery 15 of the cylindrical pile body 10, and a tip supporting force acts on the tip end side X of the rotary embedded tip enlarged wing pile 1, and the rotary embedded tip can be expanded by a very simple operation. The wing pile 1 can be firmly erected on the ground.

The rotating embedded tip enlarged wing pile 1 of the present invention is rotated in a state in which the site for excavating the ground does not protrude radially outward (outer diameter 1 ) from the surface of the outer circumference 15 of the cylindrical pile body 10, and the cylindrical excavating edge 30 The ground is excavated at , and the rotating buried tip enlarged wing pile 1 is penetrated into the ground within the range of the outer diameter 1'. Therefore, when the soil is penetrated into the ground, the excavated soil around the cylindrical pile body 10 is not loosened or disturbed by the protruding portions from the three outer peripheral surfaces of the pile 1 body, and the soil is not disturbed. Under the penetrating state, the outer peripheral surface frictional force of the cylindrical pile body 10 can be effectively secured with a sufficient magnitude.

At the excavated location, the original shape of the pile 1 can be maintained, and the construction efficiency and bearing capacity of the pile 1 can be greatly improved.

In addition, since the cavity 39 of the cylindrical excavation blade 30 erected on the tip end side X of the rotary buried tip enlarged wing pile 1 and the cavity 13 of the cylindrical pile body 10 are in communication, the excavated soil is placed inside the cylindrical pile body 10. Frictional force on the inner peripheral surface of the cylindrical pile main body 10 can be effectively ensured by entering.

It is possible to sufficiently stabilize the rotary-buried tip enlarged wing pile 1, and to provide a favorable pile 1 in terms of safety and security. It is a big step forward in the pile industry because tip bearing force, circumferential friction force and horizontal vertical force are innovative inventions.

The present invention has been described above based on each embodiment, but the present invention is not limited to the above embodiments, and modifications may be made to each embodiment without departing from the scope of the present invention. You may make it combine the described technique or other well-known or well-known technique. Further, various modifications and other forms may be adopted depending on the design, etc., as long as the same effect as the present invention can be obtained.

Although each drawing illustrates each embodiment, the present invention is not limited to the illustrated embodiments because some configurations are omitted and simplified for the sake of clarity of the drawings. In addition, there is also a partially see-through portion.

1: Rotary-buried tip enlarged wing pile 1: Outer diameter 3: Outer peripheral surface 5: Tip 10: Cylindrical pile body 10: Outer diameter 11: Tip surface 12: Protruding annular part 13: Cavity 15: Outer periphery 20: Tip plate 20i: Inner diameter 20: Outer diameter 21: Surface 22: Hole 30: Cylindrical excavating blade 30i: Inner diameter 30: Outer diameter 31: Main body 33: Blade portion 35: Periphery 37: Mountain blade portion 38: Valley blade portion 39: Cavity 40: Rotation Connector 41: Rib 46: Rib 48: Support shaft 49: Base 50: Enlarging wing 50a: Surface 50f: Forward direction side 50r: Reverse direction side 50t: Upper end 50x: Lower end 50z: Bending portion 51: First expansion Wing 51a: front surface 51b: back surface 51f: forward rotation direction side 51r: reverse rotation direction side 51t: upper end 52: second enlarged wing 52a: front surface 52b: back surface 52f: forward rotation direction side 52r: reverse rotation direction side 52t: upper end 53: Third enlarging wing 53a: Front surface 53b: Back surface 53f: Forward direction side 53r: Reverse direction side 53t: Upper end 54: Fourth enlarging wing 54a: Front surface 54b: Back surface 54f: Forward direction side 54r: Reverse direction side 54t : upper end 60: propeller blade 60a: first action surface 60b: second action surface 60f: forward direction side 60r: reverse direction side 61: first propeller blade 61a: first action surface 61b: second action surface 61f: Forward direction side 61r: Reverse direction side 62: Second propeller blade 62a: First action surface 62b: Second action surface 62f: Forward direction side 62r: Reverse direction side 63: Third propeller blade 63a: First Working surface 63b: Second working surface 63f: Forward direction side 63r: Reverse direction side 64: Fourth propeller blade 64a: First working surface 64b: Second working surface 64f: Forward direction side 64r: Reverse direction side OD : Outer diameter direction AX: Axial direction A: Forward rotation direction B: Reverse rotation direction C1: Imaginary line C2: Imaginary line X: Front end side Y: Rear end side

Claims (3)

A rotating embedded tip enlarged wing pile penetrating into the ground by rotating in the normal direction,
a cylindrical pile body;
a cylindrical excavating blade erected at the tip-side axial center of the cylindrical pile body;
a plurality of enlarging wings rotatably arranged along the outer circumference of the cylindrical digging blade via a rotatable connector,
A propulsion wing inclined downward on the forward rotation direction side protrudes from the surface of each of the expansion wings,
a part of each of the expansion wings on the forward rotation direction side is covered with a part of the other expansion wings on the reverse rotation direction side;
When rotating in the normal direction, all of the expansion wings are accommodated within the outer diameter of the rotary embedded tip expansion wing pile,
A rotary embedded tip enlarged wing pile characterized in that a part of each of the enlarged wings protrudes outside the outer diameter of the rotary embedded tip enlarged wing pile when rotated in a reverse direction.
2. The rotary embedded tip enlarged wing pile according to claim 1, wherein a stopper is provided on the tip side of said rotary embedded tip enlarged wing pile or on the surface of said enlarged wing.
3. The rotary-embedded tip expansion wing pile according to claim 1, wherein a portion of the expansion wing on the reverse direction side is bent outward to form a bent portion.

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