JP2004124384A - Blade component for steel pile with blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade component for a steel pile with a blade capable of letting the blade get into the ground smoothly by rotative pressing-in, keeping a stable pile support force for a long time while it is driven into the ground, and achieving it at a reduced cost. <P>SOLUTION: An end fringe 9 on the ground cut-in side of a support blade 5 is inclined in such a way that an inner peripheral side protrudes in the peripheral direction farther than an outer peripheral side toward an outer peripheral side from an inner peripheral side. The wall thickness of the end fringe 9 is reduced like a knife. The end fringe 9 on the ground cut-in side of the support blade 5 and the outer periphery of a basic part 4 are continuous like an arc 11 when viewed on a plane. An end fringe on the anti-ground cut-in side of the support blade 5 and the outer periphery of the basic part 4 are continuous like an arc 12 when viewed on a plane in the same way. The whole part is composed of a steel integral molded part manufactured by casting. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wing component for a winged steel pile.
[0002]
[Prior art and problems]
In order to increase the supporting force of the pile, a rotary press-fit type winged steel pipe pile having a spiral supporting wing portion at a tip portion or the like is provided.
[0003]
However, conventional winged steel pipe piles have a structure in which wings cut out from a steel plate are attached to the outer periphery of the tip of a steel pipe for piles by welding, and the underground cut-side edge of the wing faces in the radial direction. It is perpendicular to the underground cutting direction, and because the wing was manufactured using a steel plate with a large thickness for reasons of securing strength, the thickness of the edge of the underground cutting side is large, Therefore, there was a problem that a great force was required to make the wings penetrate into the ground.
[0004]
In addition, the boundary between the edge of the blade on the cut side and the outer periphery of the steel pipe, and the boundary between the edge of the blade on the opposite side of the cut and the outer periphery of the steel pipe, respectively, are square corners when viewed on a plane. Therefore, stress concentrates on these boundaries in the state after completion of the underground driving, and in addition to the fact that the boundaries are welded joints, breakage occurs in those parts, However, there is also a problem that there is a possibility that the support capacity of the pile may be reduced by spreading to other places.
[0005]
Furthermore, in a structure in which wings cut from a steel plate are attached to the outer periphery of the tip of a steel pipe for piles by welding, it takes a lot of time to manufacture the wings and weld the wings to the steel pipe for piles, and mass production is required. In particular, there is a problem that the cost is high.
[0006]
The present invention has been made in view of the above-described conventional problems, and enables a wing to smoothly penetrate into the ground by rotary press-fitting, and to maintain a stable pile supporting force for a long time in a state after completion of underground driving. It is an object of the present invention to provide a wing part for a winged steel pile which can be realized at low cost.
[0007]
[Means for Solving the Problems]
The above problem is provided with a base attached to the steel pile main body, and a support wing part extending laterally from the outer peripheral portion of the base and extending in the circumferential direction around the base,
The wings are characterized in that the edge of the undercut side of the support wing is inclined from the inner side toward the outer side so that the inner side protrudes more circumferentially than the outer side. Solved by wing parts for steel piles.
[0008]
In the winged steel pile to which this wing component is attached, the undercut side edge of the support wing portion is formed such that the inner peripheral side projects from the inner peripheral side toward the outer peripheral side in the circumferential direction from the outer peripheral side. As a result, the edge on the cut side is smoothly cut into the ground by the rotary press-fitting, and the wings can be smoothly penetrated into the ground.
[0009]
Furthermore, in the above-mentioned wing component, when the edge of the support wing on the underground cut side is thinned like a blade, the edge on the cut side is smoother in the ground by rotary press fitting. The wings can be smoothly penetrated into the ground.
[0010]
Further, in the above-mentioned wing part, the edge of the support wing on the underground cut side and the outer periphery of the base are continuous in an arc shape when viewed in a plane, and the edge of the support wing on the side opposite to the underground cut side. When the base and the outer circumference of the base are continuous in an arc when viewed in a plane, stress concentration on those parts is alleviated in the state after the underground driving is completed, and a stable pile supporting force can be maintained for a long time .
[0011]
In particular, the provision of these arc-shaped portions does not necessarily require that the edge on the cut side be inclined as described above or that the edge be thinned like a blade. In short, a base attached to the steel pile main body, and a support wing extending laterally from the outer periphery of the base and extending in the circumferential direction around the base are provided, and the end of the support wing on the underground cut side is provided. The wings are such that the edge and the base outer circumference are continuous in an arc shape when viewed in a plane, and the edge of the support wing on the side opposite to the underground cut side and the base outer circumference are also in an arc shape when viewed in a plane. With the wing parts for steel piles, stress concentration in the state after the completion of underground driving can be reduced, and stable pile supporting force can be maintained for a long time.
[0012]
And when the above-mentioned wing part is made of an integrally molded product made of steel by casting, the above-described shape and structure can be realized only by pouring a molten material into a casting mold, and it can be easily manufactured. Cost can be kept low. In particular, casting and forming an arc-shaped continuous portion between the edge of the support wing on the underground cut side and the outer periphery of the base and an arc-shaped continuous portion of the edge of the support wing on the side opposite to the underground cut and the outer periphery of the base. Thus, the stress concentration on those portions in the state after the completion of the underground driving can be reduced, and the stable pile supporting force can be maintained for a long time.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0014]
In the winged steel pile 1 shown in FIG. 4, 2 is a steel pile main body, 3 is a wing part, and the steel pile main body 2 is made of a steel pipe. As shown in FIGS. 2 and 3, the wing component 3 includes a base 4 attached to the tip of the steel pile main body 2 and a support wing 5, and the support wing 5 is located on the side from the outer periphery of the base 4. It extends in a spiral around the circumference of the base 4 in the circumferential direction.
[0015]
The above-mentioned wing part 3 is made of an integrally molded product made of steel by casting, and the outer surface portion 7 at the bottom protrudes in a cone shape toward the tip end. The excavation blade portion 8 is integrated with the cone-shaped outer slope portion 7. It is provided in. The base 4 has a hollow inside and is open to the base end side for weight reduction. The base end opening is provided with a groove 6 for welding and joining with the steel pile main body 2.
[0016]
Then, as shown in FIG. 1 (A-1), the edge 9 on the underground cut side of the support wing portion 5 is formed such that the inner circumferential side is more circumferential than the outer circumferential side from the inner circumferential side to the outer circumferential side. As shown in FIG. 1 (A-2), the end edge 9 is thinned 13 like a blade. The inclination and the blade-like thinning 13 at the edge 9 on the underground cut side are also formed by the above-described casting. The edge 10 on the side opposite to the underground cut faces in the radial direction.
[0017]
Further, as shown in FIG. 1 (A-1), the edge 9 on the underground cut side of the support wing portion 5 and the outer periphery of the base portion 4 are continuous in an arc shape 11 when viewed in a plan view. As shown in FIG. 1 (b), the edge 10 of the support wing 5 on the side opposite to the underground cut side and the outer periphery of the base 4 are also continuous in an arc 12 when viewed in a plane. The arc-shaped portions 11 and 12 are also formed by the above-described casting.
[0018]
As shown in FIG. 4, the winged steel pile 1 is formed by joining the base end of the base 4 of the wing part 3 and the front end of the steel pile main body 2 by welding W in an abutting state. In the winged steel pile 1 to which the wing parts 3 are attached, when the steel stake 1 is pressed into the ground while being rotated, as shown in FIG. , And the blade G can be smoothly cut into the ground G by the above-mentioned blade-shaped thinning 13 so that the support wings 5 can be smoothly inserted into the underground G.
[0019]
In addition, in the state after the underground driving is completed, as shown in FIG. 6, the edge 9 on the underground cutting side of the support wing 5 and the outer periphery of the base 4 are continuous in an arc shape 11 when viewed in a plane. At the same time, the edge 10 of the supporting wing 5 on the side opposite to the underground cut side and the outer periphery of the base 4 are also continuous in an arcuate shape 11 when viewed in a plane, so that stress concentration on those portions is reduced, and stable. Pile bearing capacity can be maintained for a long time.
[0020]
Since the above-mentioned wing part 3 is made of an integrally molded product made of steel by casting, the above-mentioned shape can be realized only by pouring a molten material into a casting mold, and it can be easily manufactured. As a result, the cost can be reduced, and in particular, the forming accuracy of the arc-shaped portions 11 and 12 can be increased, and the stress concentration in the underground driving state can be effectively reduced.
[0021]
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the case where the supporting wing portion is formed of a spiral wing portion having a length dimension of about one turn is shown, but is not limited to the spiral shape, and the length dimension is also set to about one turn. The invention is not limited thereto, and a plurality of support wings may be provided in the circumferential direction. Further, in the above embodiment, the case where the supporting wing is configured as a wing part for a winged steel pile provided at one end of the steel pile main body is shown, but the supporting wing has the length of the steel pile main body. It may be configured as a wing part used for a steel pile having a multi-stage wing structure provided at a plurality of intervals in the direction, and there is no limitation on the position or the number of wing parts provided. In the case where the wing parts are interposed between the steel pile main bodies to form a steel pile, the cone shape 7, the excavation blade 8 and the like are omitted. In short, the wing component only needs to have at least the base portion joined to the steel pile main body and the wing portion as described above. Further, in the above embodiment, the case where the steel pile main body 2 is made of a steel pipe is shown, but the steel pile main body may be made of various shaped steels such as an H-shaped steel. Further, the attachment of the wing parts to the steel pile main body is not limited to welding, but may be a screw type or the like, and is not particularly limited.
[0022]
【The invention's effect】
Since the present invention is as described above, the wing can be smoothly inserted into the ground by rotary press-fitting, and a stable pile support force can be maintained for a long time in the underground driving state, Can be realized at low cost.
[Brief description of the drawings]
1A and 1B show a wing part of an embodiment, wherein FIG. 1A is a sectional plan view of a cut side of a wing portion viewed from line II-II of FIG. 3A, and FIG. FIG. 3B is a cross-sectional plan view of the wing portion on the side opposite to the notch as viewed from line III-III of FIG.
FIG. 2 is a front view of the wing part.
3A is a side view of the wing part, and FIG. 3B is a cross-sectional view taken along the line II of FIG. 2;
FIG. 4A is a side view showing a wing part and a steel pile main body in a separated state, and FIG. 4B is a cross-sectional side view of a steel pile having a wing part attached to the steel pile main body.
FIG. 5 is a sectional plan view showing an underground cutting state of a wing.
FIG. 6 is a side view showing an invitation after the underground driving is completed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wing steel pipe pile 2 ... Steel pile main body 3 ... Wing component 4 ... Base 5 ... Supporting wing 9 ... Cut edge side edge 11 ... Arc part 12 ... Arc part

Claims (4)

A base attached to the steel pile body, and a support wing extending laterally from an outer peripheral portion of the base and extending circumferentially around the base are provided.
The wings are characterized in that the edge of the undercut side of the support wing is inclined from the inner side toward the outer side so that the inner side protrudes more circumferentially than the outer side. Wing parts for steel piles. The wing component for a winged steel pile according to claim 1, wherein an edge portion of the support wing portion on the underground cutting side is thinned like a blade. The undercut side edge of the support wing and the outer periphery of the base are continuous in an arc when viewed in a plane, and the opposite end of the support wing on the side opposite to the undercut and the outer periphery of the base are viewed in a plane. The wing part for a winged steel pile according to claim 1, wherein the wing part is also continuous in an arc shape. The wing part for a winged steel pile according to any one of claims 1 to 3, wherein the wing part is an integrally formed product made of steel by casting.

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