JP2006265853A - Concrete pile with screw blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete pile with a screw blade, which enables the screw blade to be easily mounted on a pile body on a construction site, and which enables a structure for mounting the screw blade to be strengthened by fastening a small number of screws. <P>SOLUTION: A screw member 20, which comprises a cylindrical barrel part 21 and the screw blade 33 integrally provided on the outer periphery of the barrel part 21, is fixed by fitting the barrel part 21 into the outer periphery of the concrete pile body 10. In this case, the barrel part 21 is composed of barrel constituting members 20a and 20b which are formed in such a shape that a cylinder is longitudinally split into a plurality of parts; the screw blade 22 is integrally and protrusively provided on the outer peripheral surface of each of the barrel constituting members; joint piece parts, which are provided at both the circumferential side edges of each of the barrel constituting members 20a and 20b, are assembled into a cylindrical shape by being joined in the state of being superposed on the inside and outside of the cylinder; both the joint piece parts are superposed on each other by fitting a protrusive streak, directed in the axial direction of the barrel part and formed on either of the joint surfaces of the joint piece parts, into a recessed groove formed in the other joint surface; and superposed parts are fixed together by means of a bolt. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a concrete pile with screw wings used as the foundation of a structure.

  Conventionally, piles generally used as a foundation of a structure include steel pipe piles entirely made of steel pipes, concrete piles made entirely of precast concrete, or concrete-filled steel pipe piles filled with concrete in steel pipes. In some piles, spiral screw blades are provided on the outer periphery, and the piles are swung to penetrate into the ground.

    Rotary piles using screw blades of this type are generally used for steel pipe piles and concrete-filled steel pipe piles, and those with screw blades projecting by welding on part or all of the outer peripheral surface of the pile are used (patents) References 1, 2).

    In concrete piles, in recent years, as shown in FIG. 6, screw wings 2 are protruded from one or a plurality of locations on the outer periphery of the precast concrete pile body 1, and the pile piercing holes 3 are drilled in advance. After being inserted into the slab, it has been developed to rotate and rotate the tip into the stable ground.

As shown in FIGS. 7 and 8, the screw blades 2 are fixed in this type of pile, as shown in FIGS. 7 and 8, when the pile body 1 is manufactured, the steel tube 5 is insert-molded at a predetermined position on the outer periphery of the pile, and the pile body concrete is fixed. A method of projecting the screw blades 2 by welding on the outer periphery of the steel pipe tube 5 after curing, and a groove 6 into which the steel pipe tube 5 fits at the time of manufacturing the pile body as shown in FIGS. Separately, screw wings 2 project from the outer peripheries of half halves 5a and 5a, each of which is a half of steel pipe tube 5, and after the concrete pile body 1 is cured, the halves 5a and 5a are fitted into grooves 6. A method has been developed in which the halves are fixed by bolts 8 via flanges 7.
JP 2002-339353 A JP 2004-011355 A

    In the conventional method of inserting a concrete pipe into a concrete pile body as described above and welding the screw blade after curing the concrete, it is necessary to weld the screw blade at the factory, and the screw blade becomes an obstacle during transportation. There are problems such as high transportation costs and damage to the screw blades during transportation.

    On the other hand, in the case of a half-tube-like half body with screw wings protruding on the outer periphery, the screw wings can be assembled on site in the same way as normal concrete piles. Although it can be transported and damage such as deformation during transportation is less likely to occur, the flange for connecting the half body protrudes between the screw blades, so there is no penetration resistance when the concrete pile is rotated and penetrated. growing. Furthermore, the external force in the circumferential direction that acts upon penetration of the bolt and flange must be greater than the external force generated when the pile is screwed in both the tensile stress of the bolt and the bending stress of the flange. There was a problem that it was necessary to make it strong and the cost was high.

    In view of such a conventional problem, the present invention can easily attach the screw blades to the concrete pile body at the construction site, and becomes strong by a small number of screws for the attachment. And it was made for the purpose of providing the concrete pile with a screw wing | blade which does not become resistance at the time of rotating a concrete pile with a screw wing | blade and penetrating into the ground.

  A feature of the invention of claim 1 for solving the conventional problems as described above and achieving an intended object is that a cylindrical cylindrical shaft portion and one or more integrally provided on the outer periphery of the cylindrical shaft portion A screw pile having a screw wing, and a screw piled concrete pile fixed by fitting the cylindrical shaft portion to the outer periphery of the concrete pile body, and the cylindrical shaft portion has a shape in which a cylinder is divided into a plurality of lengths. The screw blades are integrally projected on the outer peripheral surface of each cylindrical shaft constituent member, and the joint pieces provided on both circumferential edges of each cylindrical shaft constituent member are provided in the cylinder. It is assembled into a cylindrical shape by joining it in the state of being overlapped on the outside, and both joint pieces are fitted with a projection formed in one of the joining surfaces in the axial direction of the cylindrical shaft and a groove formed in the other. And overlay each other Both lies in the fact that by integrating them with a set screw the overlapping part.

    Further, the invention of claim 2 is that, in addition to the configuration of claim 1, the screw member is fitted in an annular recess formed in the concrete pile main body.

    Further, the invention of claim 3 is characterized in that, in addition to the configuration of claim 1 or 2, the joint of the two cylindrical shaft constituent members that are overlapped with each other inside and outside the cylindrical shaft portion is a joint outside the cylindrical shaft portion. The outer periphery of the one part is positioned on the same circumference as the outer peripheral surface of the cylindrical shaft part, the inner surface of the joint piece part inside the cylindrical shaft part protrudes to the inner periphery of the cylindrical shaft part, and the protruding part is formed on the outer surface of the concrete pile body. This is because it is fitted in the groove.

    Further, the invention of claim 4 is characterized in that, in addition to the structure of claim 1, 2 or 3, a screw hole is formed in the joint piece portion inside the cylindrical body of both joint pieces overlapped with each other, Both joint pieces are screwed by screwing the bolts through the bolt insertion holes opened in the joint pieces on the outside of the cylindrical body in the screw holes.

  In the present invention, a screw member having a cylindrical tube shaft portion and one or a plurality of screw blades integrally provided on the outer periphery of the tube shaft portion is fitted into the outer periphery of the concrete pile body. The cylindrical shaft portion is configured with a cylindrical shaft constituent member having a shape in which a cylinder is divided into a plurality of vertical sections, and screw blades are integrally projected on the outer peripheral surface of each cylindrical shaft constituent member, thereby forming both cylindrical shaft configurations. Screws can be installed at the construction site where concrete piles are installed by joining them in a cylindrical shape by joining the joint pieces on both sides of the member in the circumferential direction so as to overlap the inside and outside of the cylinder. Therefore, it can be transported as efficiently as normal concrete piles, and since the concrete pile body and screw members are transported separately, Not be damaged by the weight of the preparative pile body.

    In addition, the joint pieces of the cylindrical shaft constituent members are fitted on each other by fitting the protrusions formed on one side of the joint surface in the axial direction of the cylindrical shaft portion and the concave grooves formed on the other side, and the overlapping is performed. By screwing the parts together, the outer peripheral surface of the tube shaft part has a structure with fewer protrusions other than the screw blades, has low penetration resistance, and acts on the tube shaft part in the circumferential direction. The external force to be countered by the fit between the concave groove and the protrusion, and only the component force generated in the radial direction due to the external force in the circumferential direction is only required for the screw bolt, so the elastic force against the bolt is It becomes a fraction of the external force generated in the circumferential direction and does not require high strength.

    Furthermore, the screw member can reliably prevent relative movement in the axial direction with respect to the concrete pile main body by fitting the cylindrical shaft portion into an annular recess formed in the concrete pile main body. The penetration resistance of concrete piles can be reduced.

    Further, of the joint piece portions that are overlapped on the inner and outer sides of the cylindrical shaft portions of the two cylindrical shaft constituent members, the outer periphery of the joint piece portion outside the cylindrical shaft portion is positioned on substantially the same circumference as the outer peripheral surface of the cylindrical shaft portion. By projecting the inner surface of the joint piece inside the cylindrical shaft part to the inner periphery of the cylindrical shaft part and fitting the protruding part into the concave groove formed on the outer surface of the concrete pile body, the unevenness on the outer periphery of the cylindrical shaft part is reduced. , The penetration resistance is small.

    Furthermore, a screw hole is formed in the joint piece inside the cylinder of the joint pieces overlapped with each other, and the bolt is screwed into the screw hole through a bolt insertion hole opened in the joint piece outside the cylinder. By screwing both joint pieces, the screw wing can be easily attached to the concrete pile body at the pile construction site.

    Next, an embodiment of the present invention will be described based on the examples shown in FIGS.

    In the figure, reference numeral 10 denotes a precast concrete pile main body, and this pile main body 10 is formed by applying a predetermined reinforcing bar in a centrifugal mold and pouring the concrete while rotating as in the case of manufacturing a normal concrete pile. . In addition, it may be molded using a mold that does not rotate. Moreover, the edge part of this pile main body 10 is integrally provided with the taper-shaped tip metal fitting 10a and the cylindrical metal fitting 10b for connection between piles as needed.

The pile main body 10 is formed with an annular recess 11 in the circumferential direction on the outer periphery of a desired screw blade installation portion. A steel screw member 20 is fitted in the annular recess 11.
The screw member 20 is composed of a cylindrical tube shaft portion 21 and screw wings 22 projecting integrally on the outer periphery thereof, and is fixed to the pile body 10 by fitting the tube shaft portion 21 into the annular recess 11. .

    The screw member 20 is composed of two halves 20a and 20b each having a substantially half-divided shape, and the tubular shaft portion 21 is composed of substantially semi-cylindrical tubular shaft constituting members 21a and 21b. Screw blade halves 22a and 22b project from the outer periphery of the cylindrical shaft constituent member.

    Joint pieces 23a and 23a are integrally provided on both edges of one of the cylindrical shaft constituent members 21a, and joint pieces 23b and 23b are integrally provided on both edges of the other cylindrical shaft constituent member 21b. ing.

    The joint piece portions 23a and 23b are joined to be arranged so as to overlap the inside and outside of the tube shaft portion, thereby forming a cylindrical tube shaft portion 21. The joint piece portions 23a and 23b joined to each other are shown in FIG. As shown in FIG. 2, the cross section is formed in a corrugated shape, a concave groove 24 continuous in the steel pipe axial direction is formed on one joint surface, and a ridge 25 is formed on the other joint surface. Between the piece parts 23a, 23b, the other side protrusion 25 is formed in a shape in which the other side protrusion 25 fits in the groove 24 on one side.

    In addition, a bolt insertion hole 26 is formed in the joint piece portion 23a positioned on the outer surface side of the cylinder shaft portion when the members are joined, and the bolt insertion hole 26 is formed in the joint piece portion 23b positioned on the inner surface side of the cylinder shaft portion. A screw hole 27 is formed at a matching position, and the bolts 28 are inserted into the bolt insertion holes 26 in a state where the joint pieces 23a and 23b are joined to each other, and are screwed into the screw holes 27 and fastened. The joint pieces 23a and 23b joined together are integrated with each other. As a result, both cylindrical shaft constituent members 21a and 21b are assembled in the circumferential direction to form a cylindrical cylindrical shaft portion 21.

    The joint piece portions 23a and 23b to be joined to each other have the outer peripheral surface of the joint piece portion 23a located on the outer surface side of the cylindrical shaft portion substantially the same diameter as the cylindrical outer peripheral surface of the cylindrical shaft portion 21, that is, the outer periphery of the joint piece portion 23a is the cylindrical shaft. The joint piece portion 23b located on the inner surface side of the cylindrical shaft portion protrudes inward from the cylindrical inner peripheral surface of the cylindrical shaft portion 21 while being formed so as to be positioned on substantially the same circumference as the outer periphery of the portion 21. Has been. The joint piece 23b protruding inwardly fits into the recessed portion 11a formed in the annular recess 11 of the pile body 10, and the tip of the bolt 28 screwed through the joint piece 23b is this. It fits into a recess 11b formed in the recess 11a.

    The screw blade halves 22a and 22b are arranged in a helically continuous manner in a state in which the cylindrical shaft constituent members 21a and 21b are joined to each other and assembled into the cylindrical cylindrical shaft portion 21. ing.

    Thus, by fitting the cylindrical shaft portion 21 in the pile body 10 annular recess 11, the axial movement of the screw member 20 relative to the pile body is prevented, and the recessed portion 11 a in the annular recess 11 is inward. While fitting the protruding joint piece 23b and fitting the bolt 28 into the recess 11b, the rotation of the screw member 20 relative to the pile body 11 is prevented.

    In addition, the cylindrical shaft constituting members 21a and 21b are joined to each other with the bolts 28 so that the concave grooves 24 provided on the joint pieces 23a and 23b and the protrusions 25 are fitted together and the joint pieces are sewn together. Thus, when a circumferential pressure or tensile force is applied to the cylindrical shaft portion 21, it is sufficient to have a tensile stress sufficient to counter the component force generated in the cylindrical shaft radial direction.

    In the above example, both joint pieces are joined by fitting a pair of protrusions and grooves, but as shown in FIG. 5, a plurality of pairs of grooves 24 and protrusions 25 are fitted. A mating structure may be used. In addition, the same code | symbol is attached | subjected to the part which is common in the said Example, and duplication description is abbreviate | omitted.

    Further, the cylindrical shaft portion 21 is constituted by two longitudinally divided cylinder shaft constituting members 21a and 21b, and may be constituted by a steel pipe peripheral wall constituting member divided into three or more in the circumferential direction. Good.

It is a side view of an example of a concrete pile with a screw wing concerning the present invention. It is a front view of the screw screw member attachment part in FIG. It is the sectional view on the AA line in FIG. It is an expanded sectional view of the cylinder shaft half body joint part in the concrete pile shown in FIG. It is an expanded sectional view showing a modification same as the above. It is a side view which shows the prior art example of the conventional concrete pile with a screw wing | blade. It is a side view which shows a screw blade attachment part same as the above. It is the BB sectional view taken on the line in FIG. It is a side view which shows the modification of the conventional screw blade attachment part. FIG. 10 is a cross-sectional view taken along the line CC in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Precast concrete pile main body 10a Tip metal fitting 10b Cylindrical metal fitting 11 Annular recessed part 11a, 11b Recessed part 20 Screw member 20a, 20b Half body 21 Cylindrical shaft part 21a, 21b Cylindrical shaft structural member 22 Screw blade 22a, 22b Screw blade half body 23a, 23b Joint piece 24 Concave groove 25 Projection 26 Bolt insertion hole 27 Screw hole 28 Bolt

Claims (4)

A screw having a cylindrical cylindrical shaft portion and one or a plurality of screw blades integrally provided on the outer periphery of the cylindrical shaft portion, and fixing the cylindrical shaft portion by fitting the cylindrical shaft portion to the outer periphery of the concrete pile body A winged concrete pile,
The cylindrical shaft portion is configured by a cylindrical shaft constituent member having a shape in which a cylinder is divided into a plurality of lengths, and the screw blades are integrally projected on the outer peripheral surface of each cylindrical shaft constituent member. It is assembled in a cylindrical shape by joining the joint pieces provided on both edges of the circumferential side in a state of being overlapped on the inside and outside of the cylinder, and both joint pieces are formed in the axial direction of the cylinder shaft portion formed on one of the joining surfaces. A concrete pile with screw wings, characterized in that a protruding ridge and a concave groove formed on the other side are fitted and overlapped with each other, and the overlapping portion is screwed and integrated.     2. The concrete pile with screw wings according to claim 1, wherein a cylindrical shaft portion of the screw member is fitted in an annular recess formed in the concrete pile main body.     Of the joint piece portions that are overlapped on the inside and outside of the cylindrical shaft portion of the two cylindrical shaft constituent members, the outer circumference of the joint piece portion outside the cylindrical shaft portion is positioned on the substantially same circumference as the outer peripheral surface of the cylindrical shaft portion. The concrete pile with a screw wing according to claim 1 or 2, wherein the inner surface of the joint piece portion inside the shaft portion is projected to the inner periphery of the cylindrical shaft portion, and the projecting portion is fitted into a concave groove formed on the outer surface of the concrete pile body.   A screw hole is formed in the joint piece inside the cylinder of the joint pieces overlapped with each other, and the bolt is screwed into the screw hole through a bolt insertion hole opened in the joint piece outside the cylinder. The concrete pile with screw wings according to claim 1, 2 or 3, wherein both joint pieces are screwed together.

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