JP4197484B2 - Steel plate ring, hardware, friction-enhanced concrete pile and manufacturing method thereof - Google Patents

Description

The present invention relates to a friction-enhanced concrete pile and a method for manufacturing the same, and more particularly, to a strong connection structure between a concrete pile and a steel plate ring or a hardware provided at the tip of the concrete pile, and a method for manufacturing the same.

  As a conventional friction-enhanced concrete pile, a technique described in Patent Document 1 described later, which has been developed and patented by the present patent applicant, is known.

  The technology of Patent Document 1 is to create a slab ring by bending a strip-shaped steel slab in which innumerable ridges are projected in stripes in the vertical and horizontal directions on the outer surface, and concrete inside the slab ring. Is a friction-enhanced concrete pile constructed by winding a steel strip around a predetermined position on the outer peripheral surface of the concrete pile.

  In manufacturing such a friction-enhanced concrete pile, generally, a temporary roadbed iron plate having strips protruding vertically and horizontally on its surface as shown in Patent Document 2 described later is used. Cut to a predetermined width to make a strip-shaped slab, bend the strip-shaped slab and weld both ends to make a slab ring, and then store this slab ring in a centrifugal mold, After casting in the centrifugal mold, the centrifugal mold was rotated to manufacture the steel piece ring integrally fixed to the outer peripheral surface of the concrete pile.

JP 2001-090062 A Design Registration No. 867671

  However, the laying iron plate for the temporary road surface used for the above-mentioned billet ring has a thickness of 6 mm or more, and therefore, it is difficult to produce a billet ring smoothly by bending it accurately. there were. Further, since the back surface of the temporary road surface iron plate is smooth, concrete is placed in a steel piece ring using the temporary road surface iron plate, and the steel ring is wound around the outer surface of the concrete pile. In this case, there is not enough connection between the slab ring and the concrete pile, so if a large frictional force is applied to the slab ring during pile driving, the slab ring may slip with the concrete pile. there were.

  Also, in the prior art, in order to improve the connection between the concrete pile and the slab ring, as illustrated in the above-mentioned Patent Document 1, the back surface (inner surface) of the slab ring also has an outer surface. Similarly, a technique for projecting the protrusions has been developed. However, making such an iron plate base material has problems such as extremely complicated processing and high cost.

  The friction-enhanced concrete pile and its manufacturing method according to the present invention is a completely new technology developed in view of the above-mentioned many problems of the prior art, and particularly by pressing using a relatively thin strip steel plate, A large number of ridges are provided on the front surface, a concave groove corresponding to the ridge is provided on the back surface, and a steel plate ring formed by bending the strip steel plate is integrally formed on the outer periphery of the tip of the concrete pile. The present invention provides a technique in which a steel plate ring is firmly and integrally joined to the outer peripheral surface of a concrete pile by winding and fixing.

The present invention is an invention which has fundamentally improved many of the above-mentioned problems, and the gist of the first invention is that a 2-4 mm meat used by being integrally wound and fixed around the outer periphery of the tip of a concrete pile. It is a steel plate ring formed by bending a thick strip-shaped steel plate, and the strip-shaped steel plate has a large number of protrusions on the outer peripheral surface, and a large number of concave grooves on the inner peripheral surface at positions corresponding to the protrusions. It is the steel plate ring characterized by being provided .

  In the first invention described above, a concave groove is provided on the inner peripheral surface of the steel plate ring integrally wound around the outer peripheral surface of the tip portion of the concrete pile. A part of the outer peripheral surface of the steel plate is bitten and joined, so that the connection between the steel plate ring and the concrete pile can be strengthened.

  Moreover, since the base steel plate constituting the steel plate ring has a structure in which protrusions and grooves corresponding to the front and back surfaces are provided, this base steel plate is stamped and pressed into a relatively thin strip steel plate. Therefore, it can be manufactured easily and inexpensively.

The gist of the second invention of the present invention is a hardware that is used by being integrally wound around and fixed to the outer periphery of the tip of the concrete pile, and a large number of protrusions project from the outer peripheral surface, and the inner peripheral surface It is a hardware characterized in that a trumpet-shaped band having a predetermined width is integrally connected to the upper edge of a steel plate ring made of a strip-shaped steel plate provided with a number of concave grooves at positions corresponding to the ridges .

  In the above-mentioned second invention, the trumpet band is integrally connected to the upper edge of the steel plate ring that is wound around and fixed to the outer periphery of the tip of the concrete pile. The strength of the concrete pile itself can be reinforced.

  When concrete piles are centrifugally molded, the upper edge of the trumpet-shaped band is brought into contact with the inner peripheral surface of the centrifugal molding die, so that when concrete is placed in the centrifugal molding die, the concrete component This prevents the cement paste from flowing out between the centrifugal mold and the outer peripheral surface of the steel plate ring.

  The gist of the method for manufacturing a friction-enhanced concrete pile according to the present invention is that a strip having a predetermined width is formed on the upper edge of a strip-shaped steel plate having a plurality of protrusions protruding on the surface and provided with concave grooves corresponding to the protrusions on the back surface After bending and welding a wide steel plate with continuous steel pieces and attaching a trumpet-shaped band integrally above the steel plate ring, the steel plate ring and the trumpet-shaped band are stored in a centrifugal mold. The upper edge of the trumpet band is brought into contact with the inner peripheral surface of the centrifugal mold, and after the concrete is placed in the centrifugal mold, the steel ring and the trumpet band are integrated on the outer periphery of the tip. A method for manufacturing a friction-enhanced concrete pile, characterized in that a concrete pile wound around and fixed to is manufactured.

  In the manufacturing method described above, bending and welding are performed using a wide steel plate in which strips of a predetermined width are continuously provided on the upper edge of the strip steel plate having protrusions or grooves on the front and back surfaces, respectively. Therefore, the steel plate ring and the trumpet-shaped band can be simultaneously formed, and for this purpose, it is possible to easily manufacture the winding hardware for the concrete pile in which the trumpet-shaped band is integrally connected above the steel plate ring. I can do it.

  In addition, since the winding hardware in which the trumpet-shaped band is integrally connected to the upper side of the steel plate ring is manufactured in this way, the winding hardware is stored in the centrifugal mold and the concrete is placed. Thus, the steel plate ring and the trumpet band can be integrally wound and fixed around the front end portion of the concrete frame. In addition, the upper edge of the trumpet-shaped band of the winding hardware is brought into contact with the inner surface of the centrifugal mold to prevent the cement paste from flowing out between the centrifugal mold and the outer peripheral surface of the steel plate ring during centrifugal molding. I can do it.

In the steel plate ring according to the first aspect of the present invention, since the concave groove is provided on the inner peripheral surface of the steel plate ring as described above, it is formed by placing concrete on the inner peripheral surface of the steel plate ring. A part of the outer surface of the concrete pile can be fitted into the groove. As a result, the steel plate ring and the concrete pile can be firmly bonded to each other, thereby preventing the steel plate ring from slipping from the concrete pile due to friction when the concrete pile is placed in the ground.

Further, in the hardware of the second invention, since the trumpet-shaped band is integrally connected and attached above the steel plate ring, the steel plate ring is more firmly attached to the concrete pile via the trumpet-shaped band. Can be combined. And since the trumpet-shaped band was provided in parallel with the steel plate ring at the tip of the concrete pile, the strength of the tip of the concrete pile can be further increased.

  In the method for manufacturing a friction-enhanced concrete pile according to the present invention, the trumpet-shaped band is integrally connected above the steel plate ring by bending and welding the wide steel plate as described above. It is possible to mass-produce hardware that is wound around and fixed to the tip of the iron at low cost. In addition, by storing the hardware in the centrifugal mold, the upper edge of the trumpet-shaped band is brought into contact with the inner peripheral surface of the centrifugal mold, whereby concrete is placed in the centrifugal mold. It is possible to prevent the cement paste from flowing out to an unnecessary place. Therefore, it is possible to mass-produce the friction-enhanced concrete pile in which the steel plate ring and the trumpet-shaped band are firmly wound and fixed on the outer peripheral surface of the front end portion very easily and at low cost.

  FIG. 1 is an enlarged explanatory view of the tip end portion of a friction-enhanced concrete pile according to the present invention, and FIG. FIG. 3 is an explanatory diagram of a steel plate ring attached to the tip of the friction-enhanced concrete pile 1, FIG. 3 is an explanatory diagram of the tip of the friction-enhanced concrete pile formed by connecting a trumpet band above the steel plate ring, and FIG. FIG. 5 is an explanatory view of a hardware in which the steel plate ring and the trumpet-shaped band of FIG. 3 are continuously provided, and FIG. 5 is a partially enlarged explanation when the hardware is stored in a centrifugal mold used when manufacturing a friction-enhanced concrete pile. FIG.

  1 and 2, reference numeral 1 denotes a friction-enhancing concrete pile according to the present invention, in which a steel plate ring 3 is wound around and fixed to the outer peripheral surface of the tip of a concrete pile 2.

  As shown in FIG. 2, the steel plate ring 3 is a strip-shaped steel plate having a predetermined width in which a large number of protrusions 4 are provided on the front surface and a plurality of concave grooves 5 corresponding to the protrusions 4 are provided on the back surface. It is configured by bending 3a and welding both edges.

  Since the steel plate ring 3 is provided with a large number of concave grooves 5 on the inner peripheral surface thereof, the steel plate ring 3 is accommodated in a centrifugal molding die (not shown), and then formed in the centrifugal molding die. When concrete is cast, the ready-mixed concrete is inserted into the concave groove 5 of the steel plate ring 3 and solidifies, so that the concrete pile 2 and the steel plate ring 3 formed from the ready-made concrete are firmly bonded to each other. I can do it.

  Therefore, when the friction-enhancing concrete pile 1 according to the present invention is placed in the ground, even when a large frictional force is applied to the steel plate ring 3, the steel plate ring 3 is prevented from peeling off and coming out of the concrete pile 2. I can do it.

  The strip-shaped steel plate 3a used when manufacturing the steel plate ring 3 is formed by, for example, pressing a mold having a predetermined convex pattern on a relatively thin steel plate having a thickness of about 2 mm to 4 mm and pressing it. The groove 4 having a shape corresponding to the protrusion 4 can be formed on the back surface at the same time that the protrusion 4 protrudes from the surface.

  A wide steel plate having ridges 4 and concave grooves 5 is manufactured in advance, a strip steel plate 3a is formed by cutting the steel plate to a predetermined width, and a steel plate ring 3 is manufactured by bending welding this. Is also possible.

  In the above embodiment, the friction-enhancing concrete pile 1 in which the steel plate ring 3 is attached and fixed to the outer periphery of the tip of the concrete pile 2 has been described in detail, but as shown in FIGS. It is also possible to constitute the friction-enhanced concrete pile 7 of the second embodiment in which the trumpet-shaped band 6 having a larger diameter is integrally connected. Since the friction-enhancing concrete pile 7 is attached with the trumpet-shaped band 6 connected to the upper edge of the steel plate ring 3 as described above, the steel plate ring 3 is more firmly coupled to the tip of the concrete pile 2. At the same time, the strength of the tip of the friction-enhancing concrete pile 7 can be significantly increased.

  In manufacturing the reinforced concrete pile 7 of the second embodiment according to the present invention, a strip-shaped steel piece 6a having a predetermined width is formed on the upper edge of the strip-shaped steel plate 3a used when the steel plate ring 3 is formed. A metal piece in which the steel plate ring 3 and the trumpet-shaped band 6 are integrated can be easily manufactured by connecting the strip-shaped steel plates 3a and the strip-shaped steel pieces 6a simultaneously and welding them together. . The strip-shaped steel piece 6a forming the trumpet-shaped band 6 is generally not provided with the protrusions 4 and the concave grooves 5, but can be configured by providing these.

  In this embodiment, since a metal piece having a trumpet band 6 integrally connected to the upper edge of the steel plate ring 3 is used, the metal piece is stored in a centrifugal mold 8 as shown in FIG. In this case, the upper edge of the trumpet-shaped band 6 whose upper diameter is increased is brought into contact with the inner peripheral surface of the centrifugal mold 8. Therefore, when the ready-mixed concrete is placed in the centrifugal mold 8, the cement paste, which is a component of concrete, is caused between the centrifugal mold 8 and the steel plate ring 3 by the action of the upper edge of the trumpet band 6. Can be prevented from flowing out and adhering to the gap.

FIG. 1 is an enlarged explanatory view of a tip end portion of a friction-enhanced concrete pile according to the present invention. FIG. 2 is an explanatory view of a steel plate ring attached to the tip of the friction-enhanced concrete pile of FIG. FIG. 3 is an explanatory view of the tip of a friction-enhancing concrete pile constructed by connecting trumpet-shaped bands above the steel plate ring. FIG. 4 is an explanatory diagram of a hardware in which the steel plate ring and the trumpet band of FIG. 3 are connected. FIG. 5 is a partially enlarged explanatory view when a metal is stored in a centrifugal mold used for manufacturing a friction-enhanced concrete pile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Friction reinforcement | strengthening concrete pile 2 ... Concrete pile 3 ... Steel plate ring 3a ... Strip-shaped steel plate 4 ... Projection 5 ... Concave groove 6 ... Trumpet-shaped band 6a ... Strip shape Steel slab 7 ... Friction-enhanced concrete pile with partly enlarged outer diameter of the pile end 8 ... Centrifugal molding die

Claims (6)

A steel plate ring formed by bending a steel strip having a thickness of 2 to 4 mm that is used by being integrally wound and fixed on the outer periphery of the tip of a concrete pile, and the strip has a plurality of protrusions projecting on the outer peripheral surface. And a plurality of concave grooves are provided on the inner peripheral surface at positions corresponding to the protrusions . It is a hardware that is used by being wound and fixed integrally around the outer periphery of the tip of a concrete pile, and a large number of protrusions are provided on the outer peripheral surface, and a number of recesses are provided at positions corresponding to the protrusions on the inner peripheral surface. A metal piece characterized in that a trumpet-shaped band having a predetermined width is integrally connected to an upper edge of a steel plate ring made of a strip-shaped steel plate provided with a groove . 2. A friction-enhanced concrete pile, wherein the steel plate ring according to claim 1 is integrally wound around and fixed to the outer periphery of the tip of the concrete pile . A friction-enhanced concrete pile, wherein the hardware according to claim 2 is integrally wound around and fixed to the outer periphery of the tip of the concrete pile . A large number of protrusions are provided on the outer peripheral surface, and the upper edge of the steel plate ring made of a strip-shaped steel plate is provided with a number of concave grooves at positions corresponding to the protrusions on the inner peripheral surface. A friction-enhanced concrete pile characterized in that a trumpet-shaped band having a predetermined width is wound around and fixed to the outer periphery of the tip of the concrete pile together with the steel plate ring. A wide strip in which strips of a predetermined width are continuously provided on the upper edge of a strip-shaped steel plate having a large number of ridges on the front surface and a plurality of concave grooves provided on the back surface at positions corresponding to the ridges. After bending and welding the steel plate and attaching the trumpet band integrally above the steel plate ring, the steel plate ring and the trumpet band are stored in a centrifugal mold and the upper edge of the trumpet band is formed by centrifugation. A concrete pile in which a steel plate ring and a trumpet-shaped band are integrally wound around and fixed to the outer periphery of the tip by rotating after the concrete is placed in the centrifugal mold and placed in contact with the inner peripheral surface of the mold A method for manufacturing a friction-enhanced concrete pile, characterized by manufacturing

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