Expanded steel pipe pile

Abstract

To provide an easily manufactured enlarged-bottom type steel pipe pile.SOLUTION: An enlarged-bottom type steel pipe pile 1 extends vertically. The enlarged-bottom type steel pipe pile 1 comprises: a circular steel pipe 2 extending vertically, having a pair of cutouts 2a at its lower end edge, and having a clearance hole 2b below; a wing member 3 which has a cylindrical body 31 having a bolt hole 31a corresponding to the clearance hole 2b and having an inner diameter larger than an outer diameter of the circular steel pipe 2, a steel bottom body 32 fixed to a lower end of the cylindrical body 31 by welding, a steel wing body 33 fixed to an outer periphery of the cylindrical body 31 by welding, and a steel material 34 stretched within the cylindrical body 31 and fixed to the cylindrical body 31 by welding, in which both ends of the steel material 34 are arranged in each of the pair of cutouts 2a, and which covers a lower end of the circular steel pipe 2 so that the bolt hole 31a corresponds to the clearance hole 2b; and a bolt 4 screwed into the bolt hole 31a and reaching the clearance hole 2b.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an enlarged-bottom steel pipe pile. [Background technology]

[0002] Patent Document 1 discloses an enlarged-bottom steel pipe pile in which wings are fixed to the lower end of a vertically extending circular steel pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3966870 Summary of the Invention [Problem to be solved by the invention]

[0004] Such enlarged-base steel pipe piles are not easy to manufacture because they require the wings to be attached by welding to a circular steel pipe having a length of about 4 m to 20 m.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an enlarged-bottom steel pipe pile that is easy to manufacture. [Means for solving the problem]

[0006] (1) The present invention relates to a vertically extending, enlarged-bottom steel pipe pile (for example, the enlarged-bottom steel pipe pile 1 described later), which comprises a vertically extending circular steel pipe (for example, the circular steel pipe 2 described later) having a pair of notches (for example, the notches 2a described later) at its lower end and a clearance hole (for example, the clearance hole 2b described later) at its lower end, a cylindrical body (for example, the cylindrical body 31 described later) having a bolt hole (for example, the bolt hole 31a described later) corresponding to the clearance hole and having an inner diameter larger than the outer diameter of the circular steel pipe, and a steel bottom body (for example, the bottom body 32 described later) fixed to the lower end of the cylindrical body by welding. and a steel wing body (for example, wing body 33 described later) fixed to the outer periphery of the cylindrical body by welding, and a steel material (for example, steel material 34 described later) suspended inside the cylindrical body and fixed inside the cylindrical body by welding, both ends of the steel material being positioned in each of the pair of notches, and a wing member (for example, wing member 3 described later) placed on the lower end of the circular steel pipe so that the bolt hole corresponds to the underside hole, and a bolt (for example, bolt 4 described later) screwed into the bolt hole and reaching the underside hole.

[0007] According to the enlarged-bottom steel pipe pile of the present invention, the wing members can be attached to the circular steel pipe using bolts, eliminating the need for welding to the circular steel pipe. Furthermore, according to the enlarged-bottom steel pipe pile of the present invention, the holes in the circular steel pipe are countersunk holes rather than bolt holes, so that when the wing members are placed over the bottom end of the circular steel pipe, the bolt holes in the cylindrical body of the wing members can easily be aligned with the countersunk holes in the circular steel pipe. Thus, the enlarged-bottom steel pipe pile of the present invention is easy to manufacture.

[0008] (2) The present invention also relates to the expanded-base steel pipe pile described in (1) above, characterized in that both ends of the steel material are positioned in each of the pair of notches, thereby preventing relative rotation between the circular steel pipe and the wing members.

[0009] (3) The present invention also relates to an expanded-base steel pipe pile as described in (1) or (2) above, characterized in that the wing body is a pair of wing plates (e.g., wing plate 331 described later) formed by cutting a regular hexagonal steel plate in half and cutting out the portion to be fixed to the outer periphery of the cylindrical body. [Effects of the Invention]

[0010] The enlarged-bottom steel pipe pile according to the above (1) to (3) of the present invention is easy to manufacture. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a front view of an enlarged-bottom steel pipe pile according to an embodiment of the present invention. [Figure 2] FIG. 1 is an exploded front view of a widened-bottom steel pipe pile. [Figure 3] This is a left side view of an enlarged-bottom steel pipe pile. [Figure 4] FIG. 1 is a plan view of a widened-bottom steel pipe pile. [Figure 5] FIG. [Figure 6] FIG. 1 is a plan view of a steel plate from which a plurality of vanes are manufactured. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a detailed description will be given of an enlarged-bottom steel pipe pile according to an embodiment of the present invention with reference to the drawings.

[0013] First, the configuration of the enlarged-bottom steel pipe pile 1 will be described using Figures 1 to 6. Figure 1 is a front view of the enlarged-bottom steel pipe pile 1. Figure 2 is an exploded front view of the enlarged-bottom steel pipe pile 1. Figure 3 is a left side view of the enlarged-bottom steel pipe pile 1. Figure 4 is a plan view of the enlarged-bottom steel pipe pile 1. Figure 5 is a plan view of the wing member 3. Figure 6 is a plan view of a steel plate P from which multiple wing plates 331 are manufactured.

[0014] The enlarged-base steel pipe pile 1 shown in Figures 1 to 4 is used in a construction method for reinforcing the ground by penetrating it into the ground by applying rotational torque and pressure force. This construction method using the enlarged-base steel pipe pile 1 does not require tip foot protection or pre-boring, so there is no need for soil removal treatment, there is no risk of soil contamination, and the burden on the environment is small.

[0015] The enlarged-bottom steel pipe pile 1 extends vertically. Specifically, the enlarged-bottom steel pipe pile 1 includes a circular steel pipe 2, wing members 3, and a pair of bolts 4.

[0016] The circular steel pipe 2 extends vertically and generates bearing capacity for the ground. This circular steel pipe 2 has a pair of notches 2a at its lower edge and a pair of countersunk holes 2b below it. Specifically, the circular steel pipe 2 has a pair of countersunk holes 2b at positions corresponding to a pair of bolt holes 31a in the cylindrical body 31 of the wing member 3 that is placed over the circular steel pipe 2.

[0017] The pair of notches 2a are formed in the shape of vertically extending slits at positions on the lower end edge of the circular steel pipe 2 that are equidistant from each other in the circumferential direction.

[0018] The pair of blind holes 2b are formed at positions that are equally spaced from each other in the circumferential direction below the circular steel pipe 2, and when viewed from below the circular steel pipe 2, they are formed at positions that alternate with the pair of notches 2a in the circumferential direction.

[0019] 1 to 5 are attached to the lower end of the circular steel pipe 2 to improve the bearing capacity for the ground. That is, the wing member 3 is fitted over the lower end of the circular steel pipe 2 so that both ends of the steel material 34 are placed in each of a pair of notches 2a in the circular steel pipe 2 and the bolt holes 31a correspond to the clearance holes 2b in the circular steel pipe 2. Specifically, the wing member 3 has a cylindrical body 31, a bottom body 32, a wing body 33, and the steel material 34.

[0020] The cylindrical body 31 has an inner diameter larger than the outer diameter of the circular steel pipe 2. The cylindrical body 31 has a pair of bolt holes 31a corresponding to each of the pair of through holes 2b in the circular steel pipe 2. A steel bottom body 32 is fixed to the lower end of the cylindrical body 31 by welding. Steel wing bodies 34 are fixed to the outer periphery of the cylindrical body 31 by welding. The pair of bolt holes 31a are each formed at positions that are equally spaced from each other in the circumferential direction of the cylindrical body 31 when viewed from below the cylindrical body 31.

[0021] The bottom body 32 is a circular steel plate having approximately the same diameter as the outer diameter of the cylindrical body 31. The bottom body 32 is fixed to the lower end of the cylindrical body 31 by welding.

[0022] The wing bodies 33 are steel wings that expand the bottom end of the circular steel pipe 2, and are fixed by welding to the outer periphery of the cylindrical body 31. The wing bodies 33 are a pair of blades 331 cut from a steel plate P (see Figure 6). As shown in Figure 6, each of the pair of blades 331 is formed by cutting the steel plate P into a regular hexagon, cutting the regular hexagonal steel plate P in half, and cutting out a portion 332 that will be fixed to the outer periphery of the cylindrical body 31 (see Figures 1 to 5).

[0023] 1 to 5, the steel material 34 is a rectangular steel plate that is suspended within the cylindrical body 31 and fixed to the inside of the cylindrical body 31 by welding. Specifically, the steel material 34 is fixed to the inner surface of the cylindrical body 31 or the upper surface of the bottom body 32 by welding. Both ends of the steel material 34 are arranged in each of the pair of notches 2a of the circular steel pipe 2, thereby preventing relative rotation between the circular steel pipe 2 and the blade member 3.

[0024] A pair of bolts 4 are screwed into bolt holes 31 a from the outside of the cylindrical body 31 of the wing member 3 and reach the through holes 2 b of the circular steel pipe 2 .

[0025] As described above, the enlarged-bottom steel pipe pile 1 extends vertically. This enlarged-bottom steel pipe pile 1 includes a circular steel pipe 2 that extends vertically and has a pair of notches 2a at its lower edge and a clearance hole 2b below it, a cylindrical body 31 that has bolt holes 31a corresponding to the clearance holes 2b and has an inner diameter larger than the outer diameter of the circular steel pipe 2, a steel bottom body 32 welded to the lower end of the cylindrical body 31, steel wing bodies 33 welded to the outer periphery of the cylindrical body 31, and a steel member 34 that spans the cylindrical body 31 and is welded to the cylindrical body 31, with both ends of the steel member 34 positioned in each of the pair of notches 2a and covering the lower end of the circular steel pipe 2 so that the bolt holes 31a correspond to the clearance holes 2b, and a bolt 4 that is screwed into the bolt holes 31a and reaches the clearance holes 2b.

[0026] With the enlarged-bottom steel pipe pile 1 according to this embodiment of the present invention, the wing members 3 can be attached to the circular steel pipe 2 using bolts 4, and welding to the circular steel pipe 2 is not necessary. Furthermore, with the enlarged-bottom steel pipe pile 1, the holes in the circular steel pipe 2 are not bolt holes but countersinks 2b, so that when the wing members 3 are fitted over the lower end of the circular steel pipe 2, the bolt holes 31a in the cylindrical body 31 of the wing members 3 can easily be aligned with the countersinks 2b in the circular steel pipe 2. In this way, the enlarged-bottom steel pipe pile 1 is easy to manufacture.

[0027] Furthermore, in the enlarged-bottom steel pipe pile 1, the steel material 34 has both ends disposed in each of the pair of notches 2a, thereby preventing relative rotation between the circular steel pipe 2 and the wing member 3.

[0028] In addition, in the enlarged-bottom steel pipe pile 1, the wing bodies 33 are a pair of wing plates 331 formed by cutting a regular hexagonal steel plate P in half and cutting out the portions to be fixed to the outer periphery of the cylindrical body 31.

[0029] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and technical concept of the present invention. In other words, the position, size, length, number, shape, material, etc. of each component can be changed as appropriate.

[0030] For example, the number of bolts 4 is not limited to one pair (two) and may be one or three or more. The number of blind holes 2b in the circular steel pipe 2 is not limited to one pair (two) and may be one or three or more corresponding to the number of bolts 4. The number of bolt holes 31a in the cylindrical body 31 of the wing member 3 is not limited to one pair (two) and may be one or three or more corresponding to the number of bolts 4.

[0031] Furthermore, each of the pair of blades 331 is not limited to a steel plate P cut into a regular hexagon, the regular hexagonal steel plate P cut in half, and a portion 332 fixed to the outer periphery of the cylindrical body 31 cut out; in other words, they are not limited to those based on a regular hexagon, but may be those based on other regular polygons or circles. [Explanation of symbols]

[0032] 1. Enlarged base steel pipe pile 2. Circular steel pipe 2a notch 2b Bakaana 3 Wing members 31 Cylinder 31a Bolt hole 32 Bottom body 33 Wing body 331 Wing plate 34 Steel materials 4 bolts P steel plate

Claims

1. A vertically extending, expanded-base steel pipe pile, a circular steel pipe extending vertically and having a pair of notches at its lower end edge and a clearance hole at its lower end; a cylindrical body having an inner diameter larger than the outer diameter of the circular steel pipe and having bolt holes corresponding to the underside holes; a steel bottom body fixed to the lower end of the cylindrical body by welding; steel wing bodies fixed to the outer periphery of the cylindrical body by welding; and a steel material suspended within the cylindrical body and fixed to the inside of the cylindrical body by welding, wherein both ends of the steel material are positioned in each of the pair of notches and the wing members are placed over the lower end of the circular steel pipe so that the bolt holes correspond to the underside holes; a bolt that is screwed into the bolt hole and reaches the underside hole. Expanded steel pipe pile.

2. The steel member has both ends disposed in the pair of notches, thereby preventing relative rotation between the circular steel pipe and the blade member. The enlarged-bottom steel pipe pile according to claim 1.

3. The blades are a pair of blades made by cutting a regular hexagonal steel plate in half and cutting out the portions to be fixed to the outer periphery of the cylindrical body. The enlarged-bottom steel pipe pile according to claim 1 or 2.

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