FOUNDATION PILE

Abstract

 A foundation pile 1 is disclosed. The foundation pile 1 includes a central axis member 10 that extends vertically in the up-down direction; a base plate 11 formed on the upper end of the central axis member 10 to fix the upper structure 2 at the upper end; and a circumferential member 20 provided on the upper side circumference of the central axis member 10 to reinforce the upper side circumference of the central axis member 10, wherein the upper surface of the circumferential member 20 is formed so as to come into contact with the lower surface of the base plate 11 without any gap.

Description

[TECHNICAL FIELD]

[0001] The present invention relates to a foundation pile that firmly supports a structure that is driven into the ground and coupled to its upper part.

[BACKGROUND ART]

[0002] Generally, when installing various structures, including pillars for signs or traffic lights, a method of driving a foundation pile into the ground and fixing the structure to the upper end of the foundation pile is used.

[0003] A typical foundation pile is configured in the shape of a tubular body that extends vertically in the up-down direction, and is equipped with a base plate (or flange part) for connecting the upper structure at the upper end, wherein the base plate is buried and fixed into the ground so that it protrudes slightly on the upper side from the ground.

[0004] However, such a foundation pile do not have sufficient strength against external forces in a lateral direction , and so when wind pressure or vibration in the lateral direction is applied to the structure fixed on the upper side, the upper end part of the foundation pile moves in a lateral direction along with the structure, which causes a problem that the support force of the foundation pile is weakened, which makes it difficult to firmly support the structure.

[0005] In particular, when the upper end of the foundation pile repeatedly and strongly flows in a lateral direction, the entire foundation pile is pulled on the upper side, which causes a problem that the support force of the foundation pile is further weakened. These problems occur not only in the pillars for signs or traffic lights mentioned above, but also in foundation piles used to support all types of structures as well.

[0006] In order to solve such problems, the applicant of the present invention has previously developed a foundation pile which includes a central axis member provided at the upper end with a base plate (or flange part) for fixing the structure, and a circumferential member that is provided on the circumferential part of the central tubular body that reinforces the upper side circumference of the central axis member. The technology related to a conventional foundation pile is disclosed in Korean Patent No. 10-1909396.

[0007] However, in the conventional technology, as shown in FIG. 1, the base plate 11 is attached only to one tubular body for forming the central axis, that is, the central axis member 10, so that it must support the upper structure 2 coupled to the base plate 11. Therefore, the neck part (N) between the base plate 11 and the circumferential member 20 is inevitably weakened due to its small cross-sectional area, which causes a problem that the entire structure is vulnerable to a horizontal load or a vertical load.

[Prior Art Literature]

[Patent Literature]

[0008] (Patent Literature 0001) Korean Patent No. 10-1909396 (issued on October 11, 2018)

[DETAILED DESCRIPTION OF THE INVENTION]

[Technical Problem]

[0009] It is an object of the present invention to provide a foundation pile that has excellent strength and durability against vertical loads, horizontal loads, and/or various other loads.

[Technical Solution]

[0010] According to one aspect of the present invention, there is provided a foundation pile 1 comprising: a central axis member 10 that extends vertically in the up-down direction; a base plate 11 formed on the upper end of the central axis member 10 to fix the upper structure 2 at the upper end; and a circumferential member 20 provided on the upper side circumference of the central axis member 10 to reinforce the upper side circumference of the central axis member 10, wherein the upper surface of the circumferential member 20 is formed so as to come into contact with the lower surface of the base plate 11 without any gap.

[0011] The foundation pile further comprises a plurality of reinforcing wings joined to the central axis member 10 and the circumferential member 20, wherein the plurality of reinforcing wings comprises one or more lower end reinforcing wings 41 joined to the lower end of the central axis member 10, a plurality of intermediate reinforcing wings 42 joined to the outer circumference of the central axis member 10, and a plurality of upper reinforcing wings 43 or 43A, 43B and 43C joined to the outer circumference of the circumferential member 20.

[0012] The foundation pile further comprises an intermediate expansion reinforcing plate 50 that is joined to the outer circumferential surface of the circumferential member 20 so as to be spaced on the lower side from the base plate 11, and resists a vertical load while having a larger area than the base plate 11, wherein the foundation pile is installed so as to fill the ground of the burial hole 7 again after the intermediate expansion reinforcing plate 50 is driven into the pre-formed burial hole 7 until it comes into contact with the ground.

[0013] The foundation pile 1 further comprises a plurality of insert holes 52 formed in the intermediate expansion reinforcing plate 50, and a plurality of auxiliary foundation piles 70 that are inserted into the insert hole 52 so that the upper ends are welded (or other fixing method) to the intermediate expansion reinforcing plate 50, wherein the auxiliary foundation pile 70 comprises a base part 71 at the upper end which is welded to the intermediate expansion reinforcing plate 50, an axial part 72 which extends vertically downward from the lower surface of the base part 71, a reinforcing circumferential part 73 which is coupled to the axial part 72 so as to surround the upper part of the axial part 72, has a size smaller than the base part 71, and has an inner diameter corresponding to the insert hole 52.

[Advantageous Effects]

[0014] The foundation pile according to the present invention comes into close contact (or joins) with the base plate provided on the upper end of the central axis member and the circumferential member provided around the upper side circumference of the central member, whereby the neck part, which exists between the base plate and the circumferential member and is vulnerable to a vertical load and a horizontal load, is eliminated, which solves existing problems such as the neck part being deformed or bent due to the vertical load or the horizontal load.

[0015] In addition, the present invention has excellent strength and durability against vertical loads, horizontal loads, and/or various other loads due to the multiple reinforcing wings provided on the outer side circumference of the foundation pile, the intermediate expansion reinforcing plate, and/or the auxiliary foundation pile connected to the intermediate expansion reinforcing plate.

[BRIEF DESCRIPTION OF THE DRAWINGS]

[0016] 

FIG. 1 is a diagram for explaining the problems of a conventional technology;

FIGS. 2 to 4 are diagrams for explaining the basic pile according to a first embodiment of the present invention;

FIGS. 5 and 6 are diagrams for explaining the basic pile according to a second embodiment of the present invention;

FIGS. 7 and 8 are diagrams for explaining the basic pile according to a third embodiment of the present invention;

FIG. 9 is a diagram for explaining the basic pile according to a fourth embodiment of the present invention;

FIGS. 10 and 11 are drawings for explaining the basic pole according to a fifth embodiment of the present invention;

FIGS. 12 to 14 are diagrams for explaining the basic pile according to a sixth embodiment of the present invention; and

FIG. 15 is a diagram showing a modification of FIG. 6.

[DETAILED DESCRIPTION OF THE EMBODIMENTS]

[0017] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings so that a person having ordinary skill in the art to which the present invention pertains can easily implement the present invention. The invention may be embodied in various different forms and should not be construed as limited to the embodiments set forth herein.

[0018] In explaining the present invention, the size or shape of components shown in the drawings may be exaggerated or simplified for the sake of clarity and convenience of explanation.

[0019] In addition, the terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or practice of the user or operator. These terms should be interpreted with meanings and concepts consistent with the technical idea of the present invention based on the contents of the entire specification.

[0020] The description of parts that are not related to the technical idea of the present invention will be omitted to clarify the present invention, and like reference numerals designate like elements throughout the specification.

[0021] Further, in the following exemplary embodiments, the components having the same configuration are designated by the same reference numerals and described in the first exemplary embodiment, and only other configurations different from the first exemplary embodiment are described in the other exemplary embodiments.

[0022] In the case in which one part is said to be "connected" to another part throughout the specification, not only may the one part be "directly connected" to the other part, but also, the one part may be "indirectly connected" to the other part via a further part. In addition, when a certain element is "included", it does not mean that other elements are excluded, but means that such elements may be further included unless mentioned otherwise. Below, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0023] FIGS. 2 to 4 are diagrams for explaining the foundation pile according to a first embodiment of the present invention.

[0024] As shown in FIGS. 2 to 4, the foundation pile 1 according to a first embodiment of the present invention is installed to be buried below the ground and is configured to support the structure 2 fixed at the upper end.

[0025] In addition, the foundation pile 1 according to the present embodiment includes a central axis member 10 which extends in the up-down direction and has a base plate 11 formed at its upper end for fixing the upper structure 2, and a circumferential member 20 of a multi-concentric circle type which is provided on the circumferential part of the central axis member 10 to reinforce the upper side circumference of the central axis member 10.

[0026] In the present embodiment, the central axis member 10 is made of a metal pipe, but may also be made of a section shape steel.

[0027] The base plate 11 is fixed by a base plate 2A formed at the lower end of the upper structure 2 and fasteners 3 such as bolts or anchors, whereby the upper structure 2 can be supported in a fixed state on the foundation pile 1.

[0028] Unlike the conventional technology in which the outer circumferential surface of the central axis member is exposed between the base plate and the circumferential member, forming a neck part vulnerable to vertical and horizontal loads, the foundation pile 1 according to the present embodiment is formed so that the upper surface of the circumferential member 20 comes into contact with the lower surface of the base plate 11 without a gap and thus, the neck part vulnerable to vertical and horizontal loads is eliminated. At this time, the outer diameter of the base plate 11 is larger than the outer diameter of the upper end of the circumferential member 20, and as a result, the outer area of the base plate 11 is outside the upper outer edge of the circumferential member 20, and fixing holes 112 for fastening the fastener 3 may be formed in the outer area of the base plate 11. The central axis member 10 may be welded to the center of the lower surface of the base plate 11, and the circumferential member 20 may be welded around it to form the foundation pile 1.

[0029] According to one embodiment, the central axis member 10 may be a metal pipe extending in the up-down direction, and the base plate 11 may be a circular metal plate welded to the upper end of the central axis member 10, or may be used in various shapes depending on the base shape of the structure.

[0030] The base plate 11 is coupled to the upper end of the central axis member 10, for example by welding, and a plurality of fixing holes 112 through which bolts that are part of the fastener 3 pass may be formed in an outer area outside the upper outer edge of the circumferential member 20, which will be described below. The upper structure 2 having a pillar shape is coupled to the base plate 11 by the fasteners 3 including holes formed in the lower end base plate 2A of the upper structure 2 and bolts and nuts that pass through the fixing holes 112.

[0031] In the present embodiment, the circumferential member 20 includes a plurality of circumferential tube parts 21, 22 and 23 which extend in the up-down direction, are configured in a circular tubular shape, each having an inner diameter larger than the inner diameter of the central axis member 10, and are arranged on the outside of the central axis member 10 so as to form concentric circles of different inner diameters; and a plurality of fixing ribs 24 which extend inwardly to connect the plurality of circumferential tube parts 21, 22 and 23 and have their inner free end parts joined to the outer circumferential surface of the central axis member 10.

[0032] The plurality of circumferential tube parts 21, 22 and 23 are configured to have the same upper height so as to come into contact with the lower surface of the base plate 11 as a whole, and is formed as a multi-stage structure in which the circumferential tube part provided on the inner side has a longer length than the circumferential tube provided on the outer side, and the lower end of the circumferential tube part provided on the inner side extends further downward than the lower end of the circumferential tube part provided on the outer side.

[0033] In a state where the lower end of the central axis member 10 comes in close contact with the ground, the foundation pile 1 is driven into the ground using a hammer, power hammer, fork lifts, pile driver, etc., wherein the base plate 11 is driven so as to be exposed above the ground GL. Preferably, the foundation pile 1 can be driven until the lower surface of the base plate 11, the upper end of the central axis member 10, and the upper end of the circumferential member 20 reach substantially the same plane as the ground. After the foundation pile 1 has been driven, it is necessary to partially excavate only the soil in a portion of the outer area of the base plate 11 to enable fastening of the fastener 3 for fixing the upper structure 2. This may provide not only the effect of eliminating the weak neck part between the circumferential member 20 and the base plate 11, but also the additional effect of allowing the base plate 11 to be supported directly on the ground.

[0034] As mentioned above, the circumferential member 20 includes a plurality of circumferential tube parts 21, 22 and 23 which extend in the up-down direction, are configured in a circular tubular shape, each having an inner diameter larger than the inner diameter of the central axis member 10, and are arranged on the outer side of the central axis member 10 so as to form concentric circles of different inner diameters; and a plurality of fixing ribs 24 which extend inwardly to connect the plurality of circumferential tube parts 21, 22 and 23 and have their inner free end parts joined to the outer circumferential surface of the central axis member 10, wherein on the upper end side, the upper end surfaces of the plurality of circumferential tube parts 21, 22 and 23 are on the same plane as the lower surface of the base plate 11, but on the lower end side, the lower ends of the inner circumferential tube part 21 or 22 extends further downward than the lower ends of the outer side circumferential tube parts 22 or 23, forming a pointed shape that can be easily driven into the ground. When the foundation pile 1 is buried in the ground, the lower end of the central axis member 10 is buried in the ground first, and the lower end is buried in the ground successively from the inner circumferential tube to the outer circumferential tube to push the soil in the ground on the outer side, which has the advantage that the foundation pile 1 can be buried in the ground effectively.

[0035] FIGS. 5 and 6 are diagrams for explaining the foundation pile according to the second embodiment of the present invention.

[0036] Referring to FIGS. 5 and 6, the foundation pile 1 according to the second embodiment of the present invention is installed to be buried under the ground and configured to support an upper structure 2 fixed to its upper end as in the previous first embodiment, and includes a central axis member 10 that extends in the direction of the lower side and has a base plate 11 at the upper end for fixing the upper structure 2, and a multi-axis type circumferential member provided on the circumferential part of the central axis member 10 to reinforce the upper side circumference of the central axis member 10.

[0037] As in the previous first embodiment, the base plate 11 is fixed to the base plate 2A formed at the lower end of the upper structure 2 by fasteners such as bolts or anchors, whereby the upper structure 2 can be supported in a fixed state on the foundation pile 1. In addition, as in the first embodiment, the foundation pile 1 is formed so that the upper surface of the circumferential members 20, 20' and 20" comes into contact with the lower surface of the base plate 11 and thus, the neck part that is vulnerable to vertical and horizontal loads is eliminated. At this time, the outer area of the base plate 11 is located outside and away from the upper outer edge of the circumferential members 20, 20' and 20", and fixing holes 112 for fastening the fastener 3 may be formed in the outer area of the base plate 11. The central axis member 10 is welded (or other fixing method) to the center of the lower surface of the base plate 11, and the circumferential members 20, 20' and 20" may be welded to the circumference thereto to form the foundation pile 1.

[0038] In the present embodiment, the circumferential members 20, 20' and 20" are composed of a plurality of circumferential tube parts 25 arranged and coupled along the circumference of the central axis member 10. In the present embodiment, since the circumferential members 20, 20' and 20" have a plurality of circumferential tube parts 5 that form a plurality of axes, this is a multi-axial circumferential member that is distinguished from the multi-concentric circumferential member of the previous embodiment.

[0039] At this time, it is preferable that the plurality of circumferential tube parts 25 are directly coupled to the central axis member 10, but they may also be coupled to the central axis member 10 through ribs made of metal plates. The circumferential tube part 25 is configured in the form of a cylindrical tube extending in the up-down direction.

[0040] At this time, the circumferential tube part 25 is composed of six parts, and may be disposed at an angle of 60° on the circumferential surface of the central axis member 10. However, the number of circumferential tube parts 25 does not limit the present invention.

[0041] FIGS. 7 and 8 are diagrams for explaining the foundation pile according to the third embodiment of the present invention.

[0042] Referring to FIGS. 7 and 8, the basic pile 1 according to a third embodiment of the present invention is a foundation pile having a multi-concentric circular circumferential member 20 around the central axis member 10, as in the first embodiment, and includes a plurality of reinforcing wings 41, 42, 43A, 43B and 43C joined (welded) around the central axis member 10 and/or the plurality of circumferential tube parts 21, 22, 23 of the circumferential member in order to maximize the horizontal area of the foundation pile so that it can better withstand horizontal loads due to wind loads, earthquakes, etc., wherein the plurality of wings 41, 42, 43A, 43B and 43C include one or more lower end reinforcing wings 41 joined near the lower end of the central axis member 10, a plurality of intermediate reinforcing wings 42 joined to the outer circumference of the central axis member 10, and a plurality of upper reinforcing wings 43A, 43B and 43C joined to the outer circumference of the circumferential member 20. In the present embodiment, the circumferential member 20 includes a first circumferential tube part 21 which has the largest outer diameter and the shortest length of extension in the lower side direction, a second circumferential tube part 22 whose outer diameter is larger than the outer diameter of the first circumferential tube par 21 and whose length of extension in the lower side direction is shorter than the length of extension in the lower side direction of the first circumferential tube part 21, and a third circumferential tube part 23 whose outer diameter is larger than the outer diameter of the second circumferential tube part 22 and whose length of extension in the lower side direction is shorter than the length of extension in the lower side direction of the second circumferential tube part 22. The upper reinforcing wings 43A, 43B and 43 include a first upper reinforcing wing 43A joined to the outer circumferential surface of the first circumferential tube part 21, a second upper reinforcing wing 43B joined to the outer circumferential surface of the second circumferential tube part 22, and a third upper reinforcing wing 43C joined to the outer circumferential surface of the third circumferential tube part 23.

[0043] The reinforcing wings 41, 42, 43A, 43B and 43C may be made of an iron plate (steel plate or section shape steel) including an inclined surface that is inclined downward toward the center of the foundation pile 1, whereby the array of reinforcing wings at the same height forms a pointed shape downward to minimize resistance when the foundation pile 1 is driven into the ground.

[0044] FIG. 9 is a diagram for explaining a foundation pile according to a fourth embodiment of the present invention.

[0045] Referring to FIG. 9, the foundation pile 1 according to a fourth embodiment of the present invention is a foundation pile provided with a multi-axial circumferential member 20, 20' and 20" including a plurality of circumferential tube parts 25 arranged in a circle around the central axis member 10, and includes a plurality of reinforcing wings 41, 42 and 43 joined (welded) around the central axis member 10 and the circumferential member 20 in order to maximize the horizontal area of the foundation pile so that it can better withstand horizontal loads due to wind loads or earthquakes, etc. Wherein, the plurality of wings 41, 42 and 43 integrally include one or more lower end reinforcing wings 41 joined near the lower end of the central axis member 10, a plurality of intermediate reinforcing wings 42 joined to the outer circumference of the central axis member 10, and a plurality of upper reinforcing wings 43 joined one by one to each of the circumferential tube part 25 of the circumferential members 20, 20' and 20". Since the remaining configuration is substantially the same as the previous embodiment, a description thereof is omitted.

[0046] FIGS. 10 and 11 are drawings for explaining the foundation pile according to a fifth embodiment of the present invention.

[0047] Referring to FIGS. 10 and 11, the foundation pile 1 according to a fifth embodiment of the present invention is designed to better withstand the vertical load, and integrally includes a central axis member 10 that extends in the direction of the lower side and has a circular base plate 11 at the upper end for fixing the upper structure 2, a circumferential member 20 that is provided on the circumferential part of the central axis member 10 to reinforce the upper end circumferential part of the central axis member 10 and comes into contact with the lower surface of the base plate 11 at the upper end, and a circular intermediate expansion reinforcing plate 50 that is joined and formed to the outer circumferential surface of the circumferential member 20 so as to be spaced apart from the base plate 11 on the lower side, and resists vertical loads having a larger area than the base plate 11.

[0048] Such a foundation pile 1 can be installed on the ground in such a manner that the ground is excavated in advance with an area enough to accommodate the intermediate expansion reinforcing plate 50 to create a burial hole 7, the foundation pile 1 is driven until the intermediate expansion reinforcing plate 50 comes into contact with the ground within the burial hole 7, and then the ground of the burial hole 7 is filled again.

[0049] In such a foundation pile 1, the central axis member 20 may be a tube or H-beam or other shaped steel, T-bar, or other steel material of various shapes, including circular, square, or other cross-sectional shapes, and the intermediate expansion reinforcing plate 50 may be a steel plate larger in area than the base plate 11.

[0050] FIGS. 12 to 14 are diagrams for explaining the foundation pile according to a sixth embodiment of the present invention.

[0051] Referring to FIGS. 12 to 14, the foundation pile 1 according to a sixth embodiment of the present invention integrally includes a central axis member 10 that extends in the direction of the lower side and has a base plate 11 at the upper end for fixing the upper structure 2, a circumferential member 20 that is provided on the circumferential part of the central axis member 10 to reinforce the upper end circumferential part of the central axis member 10 and comes into contact with the lower surface of the base plate 11 at the upper end, and an intermediate expansion reinforcing plate 50 that is joined and formed to the outer circumferential surface of the circumferential member 20 so as to be spaced on the lower side of the base plate 11 and resists a vertical load while having an area larger than the base plate 11 as in the previous fifth embodiment, and additionally includes a plurality of insert holes 52 formed in the intermediate expansion reinforcing plate 50, and a plurality of auxiliary foundation piles 70 that are inserted into the insert hole 52 so that the upper end base part 71 is welded to the intermediate expansion reinforcing plate 50.

[0052] The auxiliary foundation pile (70) includes a base part 71, an axial part 72 that extends vertically downward from the lower surface of the base part 71, and a reinforcing circumferential part 73 is coupled to the axial part 72 to surround the upper part of the axial part 72, has a smaller size than the base part 71, and has an inner diameter corresponding to the insert hole 52.

[0053] The foundation pile 1 is driven into the ground until the intermediate expansion reinforcing plate 50 comes into contact with the bottom of the burial hole 7, and then the auxiliary foundation pile 70 is driven into the ground while being inserted into each of the insert holes 52, thereby allowing is a reinforcing circumferential part 73 to be located in the insert hole 52, and allowing the base part 71 to be almost in contact with the intermediate expansion reinforcing plate 50. Next, the base part 71 is welded to the intermediate expansion reinforcing plate 50. Finally, the soil is again filled in the burial hole 7.

[0054] In the present embodiment, the base plate 11 and the intermediate expansion reinforcing plate 50 is configured in a circular shape, but may also be configured in a square, polygonal, or other geometric shape.

[0055] FIG. 15 shows a modified embodiment of FIG. 6 illustrating a foundation pile having a multi-axis, multi-stage structure, which represents the foundation pile having a multi-axial single-stage structure. Referring to FIG. 15, the foundation pile is made of a circumferential member 20 consisting of a multi-axial single-stage structure including a plurality of circumferential pipes 25 of the same height.

[0056] The present invention can be modified and implemented in various ways without being limited to the above-mentioned embodiments.

[Description of Reference Numerals]

[0057] 

10: central axis member

11: base plate

20, 20', 20": circumferential member

50: intermediate expansion reinforcing plate

52: insert hole

70: auxiliary foundation pile

Claims

1. A foundation pile comprising:

a central axis member 10 that extends vertically in the up-down direction;

a base plate 11 formed on the upper end of the central axis member 10 to fix the upper structure 2 at the upper end; and

a circumferential member 20 provided on the upper side circumference of the central axis member 10 to reinforce the upper side circumference of the central axis member 10,

wherein the upper surface of the circumferential member 20 is formed so as to come into contact with the lower surface of the base plate 11 without any gap.

2. The foundation pile according to claim 1,

further comprising a plurality of reinforcing wings joined to the central axis member 10 and the circumferential member 20,

wherein the plurality of reinforcing wings comprises,

one or more lower end reinforcing wings 41 joined to the lower end of the central axis member 10,

a plurality of intermediate reinforcing wings 42 joined to the outer circumference of the central axis member 10, and

a plurality of upper reinforcing wings 43 or 43A, 43B and 43C joined to the outer circumference of the circumferential member 20.

3. The foundation pile according to claim 1,
further comprising an intermediate expansion reinforcing plate 50 that is joined to the outer circumferential surface of the circumferential member 20 so as to be spaced on the lower side from the base plate 11, and resists a vertical load while having a larger area than the base plate 11, wherein the foundation pile is installed so as to fill the ground of the burial hole 7 again after the intermediate expansion reinforcing plate 50 is driven into the pre-formed burial hole 7 until it comes into contact with the ground.

4. The foundation pile according to claim 3, further comprising:

a plurality of insert holes 52 formed in the intermediate expansion reinforcing plate 50, and

a plurality of auxiliary foundation piles 70 that are inserted into the insert hole 52 so that the upper ends are welded to the intermediate expansion reinforcing plate 50,

wherein the auxiliary foundation pile 70 comprises a base part 71 at the upper end which is welded to the intermediate expansion reinforcing plate 50, an axial part 72 which extends vertically downward from the lower surface of the base part 71, a reinforcing circumferential part 73 which is coupled to the axial part 72 so as to surround the upper part of the axial part 72, has a size smaller than the base part 71, and has an inner diameter corresponding to the insert hole 52.

Drawing