JP7065547B1 - Steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe pile capable of increasing the strength and excavation force of a wing portion provided at a tip portion. SOLUTION: This is a steel pipe pile 10 in which two wing portions 30 having an outer diameter larger than the outer diameter of the steel pipe 20 are fixed to a tip portion 20a of the steel pipe 20 along the circumferential direction, and the two wing portions 30 are , Has a meshing portion 32 that meshes with each other while being fixed to the steel pipe 20. The meshing portion 32 meshes with each other at the central shaft portion of the steel pipe 20. Further, the two wing portions 30 have a slit-shaped meshing portion 32 extending from a position in contact with the other wing portion 30 facing each other. [Selection diagram] Fig. 1

Description

The present invention relates to a rotary intrusive steel pipe pile used for supporting a building such as a building on soft ground.

Generally, when constructing a building such as a building in a place where the ground is soft and the bearing capacity of the ground is not sufficient, a concrete pile or a steel pipe pile is penetrated into the hard ground existing underground by a construction machine to support it. Secure power.

Concrete piles are inexpensive and have high bearing capacity, so they have been adopted in many construction sites. However, concrete piles have the drawback that the length of the piles cannot be easily adjusted at the construction site, so it is difficult to use them on complicated ground where the depth of hard ground is not constant. On the other hand, steel pipe piles are often used in complicated ground where the depth of hard ground is not constant because the length can be easily adjusted at the construction site by cutting or welding.

The steel pipe pile has a flat plate-shaped or spiral wing portion at the tip portion, and can generate an excavating force when rotating and penetrating, and can increase the bearing capacity by being placed on hard ground. The wing portion is joined to the lower surface of the steel pipe pile by welding or the like. A steel pipe pile having a wing portion at the tip portion is disclosed in, for example, Patent Document 1.

Japanese Unexamined Patent Publication No. 2005-314930

The wing portion is required to have sufficient strength in both the penetration direction and the pull-out direction of the steel pipe pile. In the conventional steel pipe pile, a plurality of blades are provided in the circumferential direction, and each blade is fixed to the steel pipe pile, so that sufficient strength can be obtained. It is required to make it even higher.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a steel pipe pile capable of increasing the strength and excavation force of a wing portion provided at a tip portion.

In order to solve the above-mentioned problems, the steel pipe pile according to the invention of claim 1 is a steel pipe pile in which two blades having an outer diameter larger than the outer diameter of the steel pipe are fixed to the tip of the steel pipe along the circumferential direction. The two blades are characterized by having meshing portions that mesh with each other while being fixed to the steel pipe.

In order to solve the above problem, the steel pipe pile according to the invention of claim 1 is a steel pipe pile in which two blades having an outer diameter larger than the outer diameter of the steel pipe are fixed to the tip of the steel pipe along the circumferential direction. The two blades have meshing portions that mesh with each other while being fixed to the steel pipe, and the meshing portions have a slit shape extending from a position in contact with the other blade portions facing each other. It is configured as a feature.

Further, the steel pipe pile according to the present invention is characterized in that the two blade portions have the slit-shaped meshing portions extending from the positions where they are in contact with the other blade portions facing each other.

Further, the steel pipe pile according to the present invention is characterized in that the two blades are fixed to the lower end surface of the steel pipe.

According to the steel pipe pile according to the present invention, since the two blades are engaged with each other and fixed to the steel pipe pile, the strength and excavation force of the blade can be increased.

It is a perspective view near the tip portion of the steel pipe pile which concerns on this embodiment. It is a top view of two wings. It is an exploded front view near the tip of a steel pipe pile. It is a front view near the tip part of the steel pipe pile which fixed the wing part. It is a perspective view near the tip portion of the steel pipe pile which concerns on 2nd Example. It is a perspective view near the tip portion of the steel pipe pile which concerns on 3rd Example. It is a top view of the two blades having an elliptical arc. It is a top view of the two blades having a polygonal shape.

Embodiments of the present invention will be described in detail with reference to the drawings. The steel pipe pile 10 of the present embodiment is used to secure the bearing capacity by penetrating the tip portion into the hard ground when constructing a building on soft ground.

As shown in FIG. 1, the steel pipe pile 10 is formed by fixing two blades 30 to the tip portion 20a of the steel pipe 20. The wing portion 30 is inclined to the plane direction orthogonal to the central axis direction of the steel pipe 20 and is fixed to the steel pipe 20. Further, the two blade portions 30 are inclined in opposite directions with respect to the plane direction orthogonal to the central axis direction of the steel pipe 20.

As shown in FIG. 2, the wing portion 30 is formed in a semicircular shape obtained by dividing a circular flat plate into two equal parts by a center line. That is, the wing portion 30 has a shape in which one circular shape is formed when the two wing portions 30 are combined. The wing portions 30 are arranged so as to be in contact with each other at the tip portion 20a of the steel pipe 20 at a position centered on a circular shape in which the two wing portions 30 are combined. The wing portion 30 has a slit-shaped meshing portion 32 extending in the radial direction from a position where the wing portion 30 is in contact with the other facing wing portion 30. As shown in FIG. 1, the meshing portions 32 mesh with each other in a state where the two blade portions 30 are fixed to the steel pipe. The position where the meshing portions 32 mesh with each other is the central shaft portion of the steel pipe 20.

The blade portions 30 may or may not be joined by welding or the like at the meshing portion 32.

Since the wing portions 30 are meshed with each other at the meshing portion 32 and fixed to the steel pipe 20, the wing portions 30 are firmly fixed to each other, and when a large force is applied to one wing portion 30 during excavation, the other wing portion 30 is applied. Since the fixing force of the portion 30 to the steel pipe 20 also acts, the strength can be improved and the excavation force can be improved.

As shown in FIG. 3, at the lower end portion of the steel pipe 20 to which the blade portion 30 is attached, inclined surfaces 21 inclined in opposite directions are formed in half circumferences. The two inclined surfaces 21 are formed so that the front side and the back side partially overlap each other in the central portion in the front view of the steel pipe 20. The two blades 30 are each in contact with the inclined surface 21. At this time, the wing portions 30 mesh with each other at the meshing portion 32. The wing portion 30 is joined and fixed to the steel pipe 20 by welding or the like. As a result, as shown in FIG. 4, it is possible to form a steel pipe pile 10 in which the blade portions 30 are meshed with each other and fixed at the central shaft portion of the steel pipe 20.

A second embodiment of the steel pipe pile will be described. As shown in FIG. 5, the steel pipe pile 11 of the second embodiment has two slits 41 on the peripheral surface of the steel pipe 40, and the wing portion 30 is inserted and fixed to each slit 41. The slit 41 is formed so as to be inclined in opposite directions. In this way, by inserting the wing portion 30 into the slit 41 instead of the lower end surface of the steel pipe 40, the strength of the steel pipe pile 11 at the time of pulling out can be increased. Also in this structure, the wing portion 30 inserted into the slit 41 has a meshing portion 32 that meshes with each other at the central shaft portion of the steel pipe 40. Thereby, the strength of the wing portion 30 can be improved.

A third embodiment of the steel pipe pile will be described. As shown in FIG. 6, the steel pipe pile 12 of the third embodiment has an extension portion 52 in which a part of the lower end portion of the steel pipe 50 in the circumferential direction extends toward the tip end side. Two extension portions 52 are provided, which is the same number as the number of wing portions 30. The extending portion 52 has slits 51 on both side portions into which the circumferential end portions of the wing portions 30 can be inserted. The wing portion 30 is arranged so as to straddle between the adjacent extending portions 52, and both ends in the circumferential direction are inserted into the slit 51 and fixed. That is, both sides of the wing portion 30 in the circumferential direction are supported by the slits 51. Therefore, the blade portion 30 can sufficiently secure the fixing strength to the steel pipe 50 in both the penetration direction and the pull-out direction of the steel pipe pile 12. Also in this structure, the wing portion 30 inserted into the slit 51 has a meshing portion 32 that meshes with each other at the central shaft portion of the steel pipe 50. Thereby, the strength of the wing portion 30 can be improved.

An example of deformation of the wing portion will be described. The wing portion may have a shape other than a semicircle. As shown in FIG. 7, the wing portion 35 may have a semi-elliptical shape obtained by dividing an elliptical flat plate into two equal parts by a center line. The wing portion 35 has a meshing portion 36 at a position at the center of the ellipse. Further, as shown in FIG. 8, the wing portion 37 may have a semi-polygonal shape obtained by dividing a hexagonal flat plate into two equal parts by a center line. The wing portion 37 has a meshing portion 38 at a position at the center of the hexagon. Further, the wing portion may have a polygonal shape other than a hexagon.

Although the embodiment of the present invention has been described above, the application of the present invention is not limited to the present embodiment and may be variously applied within the scope of the technical idea thereof. For example, the outer diameter of the wing portion 30 may be larger than the outer diameter of the steel pipe 20, and may be larger than the wing portion 30 shown in the figure. Further, the shape of the lower end portion of the steel pipe 20 may be changed so that the position where the blade portions 30, which are the positions where the meshing portion 32 is formed, are in contact with each other is other than the central shaft portion of the steel pipe 20.

10 Steel pipe pile 11 Steel pipe pile 12 Steel pipe pile 20 Steel pipe 20a Tip part 21 Inclined surface 30 Wing part 32 Mating part 40 Steel pipe 41 Slit 50 Steel pipe 51 Slit 52 Extension part

Claims (4)

A steel pipe pile in which two blades having an outer diameter larger than the outer diameter of the steel pipe are fixed to the tip of the steel pipe along the circumferential direction.
The two blades have meshing portions that mesh with each other while being fixed to the steel pipe.
The meshing portion is a steel pipe pile having a slit shape extending from a position in contact with the other wing portion facing each other . The steel pipe pile according to claim 1, wherein the meshing portion meshes with each other at a central shaft portion of the steel pipe. The steel pipe pile according to claim 1 or 2 , wherein the blade portion is arranged so as to be inclined in a direction opposite to each other in a plane direction orthogonal to the central axis direction of the steel pipe. The steel pipe pile according to any one of claims 1 to 3 , wherein the two blades are fixed to the lower end surface of the steel pipe.

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