KR101869705B1 - Helical pile improved support power and extended fore end - Google Patents

Abstract

The present invention relates to a two-stage front tip extension type helical pile with improved supporting force, comprising: a shaft made of a circular pipe; a first extended disk disposed at a position downwardly spaced apart from the bottom of the shaft; a second extended disk disposed by being upwardly spaced apart from the first extended disk and coupled to the bottom of the shaft; a coupling member coupled to the first and second extended disks; an excavation blade coupled to the central part of the bottom surface of the first extended disk; a plurality of first supporting force enhancing anchoring members coupled to the circumferential part of the bottom surface of the first extended disk to protrude to a lower part; a plurality of second supporting force enhancing anchoring members coupled to the circumferential part of the bottom surface of the second extended disk to protrude to a lower part; and a helical blade coupled to the outer circumferential surface of the shaft. According to the present invention, the present invention provides supporting force and internal force equivalent to a pretensioned spun high strength concrete (PHC) pile while maintaining an advantage of a helical pile, capable of solving safety and environmental problems caused by noise and vibration, secures structural stability against pulling force, and smoothly performs initial ground excavation, thereby smoothly driving a pile into the ground.

Description

[0001] The present invention relates to a two-stage tip-extended helical file having improved supportability,

[0001] The present invention relates to a two-step tip-extended helical file with improved bearing capacity, and more specifically to a helical file which can solve safety problems and environmental problems due to noise and vibration It has the support and strength equivalent to the PHC file while retaining its merits. It also ensures the structural stability against the pulling force, and the second stage with improved bearing capacity that smoothes the initial ground excavation smoothly, End extended helical file.

PC (Prestressed Concrete) files have been widely used for reinforcing foundation structures in the construction of bases supporting loads of conventional structures or civil engineering structures.

A PHC file (Pretensioned Spun High Strength Concrete Pile) and a Helical Pile have been put to practical use in order to overcome the shortcomings of the conventional PC file.

The PHC file is composed of a concrete structure, and has a joint steel plate and a reinforcement band between an upper file and a central file in which an axially oriented PC steel bar is buried in the center and a spiral wire is embedded around the center steel file, And a reinforcing cap at the upper end of the upper pile, and has an outer diameter of 400 mm to 600 mm.

The helical file includes a shaft having a hollow pipe shape and helical blades welded to the outer circumferential surface of the shaft. The outer diameter of the shaft is 88.9 mm ㅧ 11.0 mm and the shaft diameter is 114.3 mm ㅧ 9.0 mm. The wings have outer diameters of 240 mm, 270 mm and 300 mm.

When the PHC file and the helical file are compared with each other, the PHC file has an allowable history per file nod of 90 kN / EA to 1800 kN / EA when the outer diameter is 400 mm to 600 mm, and the helical file has the outer diameter of the shaft, 600 600kN / EA for 11.0mm, and 700kN / NA for 114.3mm ㅧ 9.0mm.

Therefore, the PHC file has a greater bearing capacity and strength than the helical file, which is advantageous in the case of a building having a high-leveled structure and a large-sized civil engineering structure, And the press-in method in which the file is compressed by the press-in method. The hitting method and the press-in method are disadvantages such as safety problems due to noise and vibration at the time of construction and environmental problems have.

The helical file has a disadvantage in that it has a lower bearing capacity and lower strength than the PHC file. However, the helical file does not use a large equipment such as an auger drill machine, It is possible to solve safety problems and environmental problems due to noise and vibration at the time of construction.

Helical file is also advantageous in construction such as downtown, where construction sites are narrow, noise-sensitive places, and towing power (power acting in the direction of extraction).

As a prior art related to the conventional helical file, Korean Patent Registration No. 10-1447079 (registered on July 28, 2014) "Helical file of buckling prevention structure and its construction method" (hereinafter referred to as "prior art 1" Patent Document 10-1447080 (Registered on Sep. 26, 2014) discloses a helical file having a torsional damage prevention and buckling prevention structure and a construction method thereof (hereinafter referred to as " Prior Art 2 ").

The helical file of the prior arts 1 and 2 has a structure including a file body made of a hollow shaft member and a rotary blade wound around a lower end outer surface of the file body in a form in which the plate member is twisted. It does not solve the problem of helical file of technology.

In addition, since the helical file of the prior art 1 and 2 has a conical cutting head at the bottom of the file, the initial ground cutting is smoothly performed There is a problem that it is not supported.

Therefore, it maintains the merit of helical file which can solve the safety problems and environmental problems caused by noise and vibration, and has the same bearing capacity and strength as the PHC file and ensures the structural stability against pulling force. In addition, it is required to develop a technique to smoothly perform the initial ground cutting and to smoothly perform intrusion.

Korean Registered Patent No. 10-1447079 (Registered on July 28, 2014) "Helical file of buckling prevention structure and method of construction thereof" Korean Registered Patent No. 10-1447080 (Registered on Sep. 26, 2014) "Helical file with anti-twist damage and buckling prevention structure &

Therefore, it is an object of the present invention to provide a structure that maintains the merits of a helical file that can solve safety problems and environmental problems due to noise and vibration, has a bearing capacity and a strength equal to those of a PHC file, The present invention provides a two-tiered topology-extended helical file in which the initial ground excavation is smoothly performed and the penetration is smoothly performed.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, A first extension disk disposed at a position spaced downward from a lower end of the shaft; A second expanding disk spaced upward from the first expanding disk and coupled to a lower end of the shaft; An engaging member for engaging the first expanding disc and the second expanding disc; An excavating blade coupled to a bottom center of the first expansion plate; A plurality of first supporting force increasing fusing members coupled to a bottom periphery of the first expanding disc and protruding downward; A plurality of second supporting force enhancing fusing members coupled to a bottom periphery of the second expansion disc and projecting downward; And a helical blade coupled to an outer circumferential surface of the shaft, wherein the shaft includes a shaft main body formed of a circular pipe, and a mounting portion coupled to an upper end of the shaft main body and coupled to a hydraulic rotary device installed on a boom of a backhoe. Wherein the outer diameter of the first expanding disc is configured to have a small outer diameter of the second expanding disc, and the engaging member has a relatively wide upper side, a relatively narrow base, a center side vertical side, Wherein a plurality of parallelogram joints having outer peripheral side hypotenuses are coupled to each other at the center side vertical sides to have a cross shape and the upper sides of the plurality of parallelogram joint members are engaged with the lower surface of the second expansion disc, Wherein the excavating blade is relatively wide and has an upper side coupled to a lower surface of the first expanding disk, Wherein a plurality of parallelogramular excavator pieces each having a center side vertical side and a circumferential side hypotenuse are joined at the central side vertical sides and are formed in a cross shape so that the upper side of the plurality of parallelogram digging pieces is spaced from the lower side Wherein the first supporting force increasing fixing member is composed of a relatively wide upper side, a relatively narrow base, and a plurality of parallelogram first fixing pieces having a pair of hypotenuse, wherein the plurality of parallelogram first The upper side of the fixing member is coupled to the lower surface of the first expansion disk, and the second supporting force enhancing fixing member has a relatively wide upper side, a relatively narrow base, and a plurality of parallelogram second fixing members having a pair of hypotenuse Wherein the upper side of the plurality of parallelogram second fixing members is coupled to the lower surface of the second expansion disk, and the first fixing force adjusting member Wherein the helical blade is formed in a helical shape and the leading edge is a helical plate which forms the excavating blade and the second fixing part of the fixing device for fixing the second supporting force is provided in parallel to the normal line of the first expanding disk and the second expanding disk, The helical file of the two-stage end-extended type having improved bearing capacity is provided.

According to the helical file of the two-stage end-extended type having improved bearing capacity of the present invention, the mounting head provided at the upper end of the shaft body is mounted on the hydraulic rotary device installed in the boom of the backhoe and rotated, And the first supporting force reinforcing fixing member coupled to the lower surface of the first expanding disc excavates the ground, followed by the excavating blade provided at the lower end of the second expanding disc, 2 As the fixing member for increasing the bearing capacity excavates the ground and the helical blade excavates the ground, smooth penetration into the ground becomes possible, and safety problems and environmental problems due to noise and vibration can be solved do.

According to another aspect of the present invention, there is provided a two-stage tip-extended helix file having improved bearing capacity, comprising a first expanding disc and a second expanding disc at a lower end of a shaft body, The first expansion plate, the second expansion plate, the first supporting force increasing fixing member, and the second supporting force increasing fixing member are combined with each other, Thereby improving the bearing capacity of the helical filament.

1 to 5 show a preferred embodiment of a two-stage end-extended helical file with improved bearing capacity according to the present invention,
FIG. 1 is a perspective view of a two-stage tip-extended helical file with improved bearing capacity according to the present embodiment,
FIG. 2 is a front view of a two-stage tip-extended helical file with improved bearing capacity according to the present embodiment;
3 is a plan perspective view and a bottom perspective view of the first expanded original plate,
4 is a plan perspective view and a bottom perspective view of the second expanded original plate,
5 is a perspective view of a helical blade.

2 is a perspective view of a helically wound helicopter according to a first embodiment of the present invention;

1 to 5 show a preferred embodiment of a two-stage tip-extended helical file with improved bearing capacity according to the present invention.

As shown in FIGS. 1 to 5, the two-stage tip-extended helix pile according to the present embodiment has a shaft 100 made of a circular pipe; A first expanding disc 200 disposed at a position spaced downward from a lower end of the shaft 100; A second expansion disc 300 spaced upward from the first expansion disc 200 and coupled to a lower end of the shaft 100; An engaging member (400) for engaging the first expanding disc (200) and the second expanding disc (300); An excavating blade 500 coupled to the center of the bottom of the first expanding disc 200; A plurality of first supporting force increasing fixing members 600 coupled to the peripheral edges of the first expansion disc 200 and projecting downward; A plurality of second supporting force enhancing fusing members (700) coupled to the bottom periphery of the second expanding disc (300) and projecting downward; And a helical blade 800 coupled to an outer circumferential surface of the shaft 100.

The shaft 100, the first expanding disc 200, the second expanding disc 300, the engaging member 400, the excavating blade 500, the first supporting force increasing fixing member 600, The fixing member 700 and the helical blade 800 are made of a metal material such as iron or steel material of the same material.

The shaft 100 includes a shaft main body 110 formed of a circular pipe and a mounting head 120 coupled to an upper end of the shaft main body 110 and coupled to a hydraulic rotary device (not shown) .

A grouting material injection hole 130 is formed in the shaft body 110. The grouting material injection hole 130 is a hole for allowing the grouting material injected through the upper opening of the shaft body 110 to be injected into the space between the outer circumferential surface of the shaft body 110 and the inner circumferential surface of the excavating hole.

The grouting material injection hole 130 is formed in the grouting material so that the grouting material to be injected is inserted into the helical blade 800, the second expansion disk 300, the first expansion disk 200, the coupling member 400, It is preferable that the fixing member 700 for enhancing the supporting force and the fixing member 600 for supporting the first supporting force are formed above the helical blade 800 so as to be embedded in the grouting material.

It is preferable that the outer diameter of the first expanding disc 200 has a small outer diameter of the second expanding disc 300.

A plurality of reinforcing ribs 310 are coupled between the upper surface of the second expanding disc 300 and the outer peripheral surface of the shaft 100.

The reinforcing rib 310 is made of the same material as the first expanding disc 200.

The lower end of the coupling member 400 is coupled to the upper surface of the first expanding disc 200 and the upper end thereof is coupled to the lower surface of the second expanding disc 300.

The engaging member 400 is formed to have a relatively wide upper side so as to engage the first expanding disc 200 and the second expanding disc 300 and to excavate the ground, And a plurality of (four in the figure) parallelogram joints 410 having a relatively narrow base, a central side vertical side, and an outer peripheral side hypotenuse are coupled at the central side vertical side to form a cross shape.

The plurality of (four in the drawing) coupling pieces 410 are welded to the upper surface of the first expansion disc 200 by welding and the upper side is welded to the lower surface of the second expansion disc 300 by welding And the center side vertical sides are joined together by welding to form a one-piece cross member 400.

The excavating blade 500 has a plurality of (four in the figure) parallelogram diggers 510 having a relatively wide upper side, a relatively narrow base, a central vertical side, and an outer peripheral side hypotenuse in a cross shape Lt; / RTI >

The plurality of excavation pieces 510 are welded to the lower surface of the first expansion disc 200 by welding, and the center side vertical sides are welded to each other, .

The excavating blade 500 is connected to a hydraulic rotary device (not shown) provided at an end of a boom of a backhoe so that the upper end of the shaft 100 is rotated, In the penetration of the knife file into the ground, it serves to excavate the ground from the center of the file so that intrusion can be smoothly performed.

The first supporting force enhancing fixing member 600 is composed of a plurality of (four in the figure) parallelogram first fixing pieces 610 having a relatively wide upper side, a relatively narrow base, and a pair of hypotenuse .

The upper side of the plurality of first fixing parts 610 is welded to the lower surface of the first expansion disc 200 by welding.

The second supporting force increasing fixing member 700 is composed of a plurality of (four in the figure) parallelogram second fixing pieces 710 having a relatively wide upper side, a relatively narrow base, and a pair of hypotenuse .

The upper side of the plurality of second fixing parts 710 is welded to the lower surface of the second expansion disc 300 by welding.

The first supporting force enhancing fixing member 600 and the second supporting force increasing fixing member 700 are installed in parallel to the normal lines of the first expansion disc 200 and the second expansion disc 300, Stage helicopter with improved supporting capacity is installed on the ground and it is constructed to excavate the ground.

The helical blade 800 is formed in a helical shape and is composed of a helical plate body 810 having a leading edge forming an excavating blade 820.

The helical plate body 810 is constituted by one turn.

A coupling hole 830 is formed in the central portion of the helical plate body 810 and the shaft 100 is passed through the coupling hole 830 and the edge of the coupling hole 830 in the upper and lower surfaces of the helical plate body 810 To the shaft (100) by welding to the outer circumferential surface of the shaft (100).

Hereinafter, the operation of the two-stage end-extended helical file with improved bearing capacity according to the present embodiment will be described.

The ground reinforcement method using the two-stage tip-extended helical file having improved bearing capacity according to the present embodiment includes a step of inserting a two-tiered end-extended helical file having improved bearing capacity into the ground, A grouting step of injecting a grouting material into the space between the outer circumferential surface of the shaft body 110 and the inner circumferential surface of the excavating hole, and the step of arranging the head of the shaft main body 110 and installing and testing the load.

In the insertion step, when the mounting head 120 provided at the upper end of the shaft main body 110 is mounted on a hydraulic rotary device (not shown) installed in the boom of a backhoe and rotated, The first supporting force increasing fixing member 600 coupled to the lower surface of the first expanding disc 200 excavates the ground, and then the second supporting force increasing fixing member 600, which is connected to the lower surface of the first expanding disc 200, The second supporting force enhancing fixing member 700 coupled to the lower surface of the expansion disc 300 excavates the ground, and the helical blade 800 excavates the ground.

When the insertion is completed, the construction is completed through the grouting step, the head assembly step, the plate installation step, and the load testing step. These steps are performed according to a conventional method of constructing a helical file, and thus a detailed description thereof will be omitted.

Here, the depth of penetration is determined by the angle between the excavating blade 500, the first expanding disc 200, the second expanding disc 300, the first supporting force increasing fixing member 600 and the second supporting force increasing fixing member 700, Have a depth to reach.

The first expansion disc 200 and the second expansion disc 300 are provided at the lower end of the shaft main body 110. The first expansion disc 200 and the second expansion disc 300 have first support forces Since the reinforcing fixing member 600 and the second supporting force increasing fixing member 700 are combined, the supporting force of the helical pile on the ground is improved.

That is, in the approximating step, the first expansion disc 200, the second expansion disc 300, the first supporting force increasing fixing member 600, and the second supporting force increasing fixing member 700 are fixed to weathered rocks in the ground, Thereby enhancing the bearing capacity of the knife file.

According to the test results, the outer diameter of the shaft main body 110 is 146 mm, the wall thickness of the pipe wall is 8 mm, the outer diameter of the first expansion disk 200 is 236 mm, the outer diameter of the second expansion disk 300 is 350 mm, EA to 1500 kN / EA when the upper side of the fixing force increasing member 600 and the second supporting force increasing fixing member 700 are 70 mm, 50 mm and 6 mm thick, respectively.

In addition, in the case of the conventional helical file having one extended disk at the lower end of the shaft main body 110, the supporting force of the two-stage end-extended helical file improved in bearing strength according to the present embodiment is higher than 900 kN / EA to 1100 kN / EA And it is confirmed that a large supporting force can be obtained.

Further, when the outer diameter of the helical blade 800 is set to 500 mm, which is larger than the outer diameter of the first expansion disk 200 and the second expansion disk 300, it is confirmed that the excavation by the excavation blade 820 is smoothly performed there was.

The first expansion disc 200, the second expansion disc 300, the first support force increasing fixation member 600, and the second support force generating member 600 are installed while only one helical blade 800 is installed near the lower end of the shaft main body 110, It is possible to obtain an improved supporting force as compared with the conventional helical file having a plurality of helical blades due to the increase of the supporting force by the reinforcing fixing member 700 and to reduce the cost by reducing the number of helical blades to be installed I could.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: shaft 110: shaft body
120: mounting head 200: first extended disk
300: second expanded original plate 400: coupling member
410: Coupling piece 500: Excavating blade
510: excavation piece 600: first supporting force increasing fixing member
610: first fixing member 700: second supporting force increasing fixing member
710: second fixing unit 800: helical blade
810: Spiral valve body 820: Excavating blade
830: coupling ball

Claims (1)

A shaft 100 made of a circular pipe; And a helical blade (800) coupled to an outer circumferential surface of the shaft (100)
A first expanding disc 200 disposed at a position spaced downward from a lower end of the shaft 100; A second expansion disc 300 spaced upward from the first expansion disc 200 and coupled to a lower end of the shaft 100; An engaging member (400) for engaging the first expanding disc (200) and the second expanding disc (300); An excavating blade 500 coupled to the center of the bottom of the first expanding disc 200; A plurality of first supporting force increasing fixation members 600 coupled to the bottom periphery of the first expansion disc 200 and projecting downward; And a plurality of second supporting force increasing fusing members (700) coupled to the bottom peripheral edge of the second expansion disc (300) and projecting downward,
The shaft 100 includes a shaft main body 110 formed of a circular pipe and a mounting head 120 coupled to an upper end of the shaft main body 110 and coupled to a hydraulic rotary device installed on a boom of a backhoe ,
The first expansion disc 200 is configured to have an outer diameter smaller than the outer diameter of the second expansion disc 300 and the second expansion disc 300 has an outer diameter smaller than the outer diameter of the helical blade 800 Respectively,
The coupling member 400 has a relatively wide upper side, a relatively narrow base, and a lower side so as to engage the first extended disk 200 and the second extended disk 300 and to excavate the ground, A plurality of parallelogrammatic coupling pieces 410 having a center side vertical side and an outer peripheral side hypotenuse are coupled to each other at the center side vertical side, and the plurality of parallelogrammatic coupling pieces 410 are connected to the upper side A base is coupled to the upper surface of the first expansion disc 200 on the lower surface of the second expansion disc 300,
The excavating blade 500 has a relatively wide upper portion coupled to a lower surface of the first expanding disk 200, a relatively narrow base portion, and a plurality of parallelogram excavation pieces having a central vertical side and an outer peripheral side hypotenuse 510 are coupled to each other at the center side vertical side, and the upper side of the plurality of parallelogram drill pieces 510 is coupled to the lower surface of the first expansion disc 200,
The first supporting force increasing fixing member 600 is composed of a plurality of parallelogram first fixing pieces 610 having a relatively wide upper side, a relatively narrow base, and a pair of hypotenuse, and the plurality of parallelograms The upper side of the first fixing member 610 is coupled to the lower surface of the first expansion disc 200,
The second supporting force increasing fixing member 700 is composed of a plurality of parallelogram second fixing pieces 710 having a relatively wide upper side, a relatively narrow base, and a pair of hypotenuse, and the plurality of parallelograms The upper side of the second fixing member 710 is coupled to the lower surface of the second expanded original plate 300,
The first fixing member 610 of the first supporting force increasing reinforcing member 600 and the second fixing member 710 of the second supporting force increasing fixing member 700 perform an operation of excavating the ground Are provided in parallel to the normal lines of the first expansion disc (200) and the second expansion disc (300)
A grouting material injection hole 130 is formed in the shaft main body 110 at a position higher than the helical blade 800 so that a grouting material injected through the grouting material injection hole 130 is inserted into the helical blade 800, The second expansion disk 300, the second expansion disk 200, the coupling member 400, the excavating blade 500, the second supporting force increasing fixing member 700, and the first supporting force increasing fixing member 600 Wherein the grooved material is filled in the grouting material.

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