KR20230057745A - Under reaming auger apparatus and under reamed pile construction method using the same - Google Patents

Abstract

The present invention relates to a reaming auger, which can drill a borehole after expanding the diameter of the bottom of the borehole in the ground, can expand and drill the borehole after unfolding auger wings by a downward movement without any mechanical operation or malfunction, and can fold and recover the auger wings only by an upward movement, and a reaming pile construction method using the same. The reaming auger comprises: an auger housing which includes a connecting portion formed at an upper end portion thereof to be connected to a lower end of an excavation rod, an auger wing accommodating portion formed on the front of a lower end portion thereof to accommodate a pair of auger wings, hinge pin accommodating holes preventing a hinge pin from being separated, and a through-hole formed therein as a passage for the movement of air and injection material, and has an outer diameter less than or equal to the inner diameter of a borehole; the pair of auger wings including an auger wing coupling portion which is inserted into the auger wing accommodating portion of the auger housing, a hinge pin through-hole through which the hinge pin preventing separation of the hinge pin from the auger housing passes, and an auger wing protrusion portion protruding outward from the outer diameter of the auger housing; the hinge pin which passes through the hinge pin through-hole and couples to the hinge pin accommodating hole to prevent separation of the auger wing and the auger housing; and a plurality of auger tips which are provided on the front of the auger wing to crush the ground. When touching the bottom of the borehole, the pair of auger wings rotates around the hinge pin so that while the pair of auger wings are unfolded, the auger wing protrusion portions are extended outward of the outer diameter of the borehole. Therefore, the reaming auger can drill the ground, thereby forming an expanded hole with an outer diameter that is greater than that of the drilled borehole.

Description

Expanding auger and expansion pile construction method using the same {UNDER REAMING AUGER APPARATUS AND UNDER REAMED PILE CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a drilling auger and a method for constructing a drilling pile using the same, and more particularly, in hard ground such as weathered soil and weathered rock, drilling can be performed by widening the diameter of the lower end of the drilling hole, and downward movement without separate mechanical manipulation and malfunction. It relates to an enlargement auger in which the auger wing is spread out and drilled, and the auger wing can be folded and retrieved only by upward movement, and a method of constructing an expansion pile using the same.

The pile construction method used in Korea can be largely divided into three types: the pile method, the impregnated method, and the in-situ method.

Among them, the driving method is a method that has been traditionally used as a direct driving method in which piles are directly hit. Recently, this method has been used very limitedly due to pollution such as noise and vibration generated during pile driving.

In order to solve the problem of noise and vibration that occurs during the construction of the pile-up method, recently, the embedding method is widely used. These embedding methods include the pre-boring method and the inside-boring method. there is Here, the heavy excavation method refers to inserting an excavation bit and an excavation rod having a spiral for top dressing into the hollow part of the base pile, and excavating the ground using the excavation bit protruding from the tip of the base pile. It is a technique to submerge the

1 is a view showing a conventional general pile construction device.

Republic of Korea Patent Publication No. 10-2011-0103787, a related prior art, inserts a drilling rod into the hollow part of the pile, and excavates while protruding the drilling bit installed at the tip of the drilling rod from the tip of the pile. While excavating the ground by forward rotation of the rod, sinking the main pile until it reaches the support layer of the ground; Forming a preliminary bulb by rotating the excavation rod forward to excavate the support layer with the excavation bit; Protruding an enlargement bit (or auger bit) to the outside of the excavation rod, and continuously forwardly rotating the excavation rod to expand and excavate some or all of the preliminary bulbs with the enlargement bit to form an enlargement bulb; And injecting a bulb enlargement liquid into the preliminary bulbs and enlarged bulbs formed on the support layer and inserting the main pile into the enlarged bulb.

As in Republic of Korea Patent Publication No. 10-2011-0103787, when forming an enlarged bulb, an auger equipped with a bit is put in a circular tube and rotated while rotating and intruding while rotating mutually, and at this time, the bit attached to the end of the auger After excavation, the excavated soil rises on the excavation rod interpolated inside the circular pipe and is discharged to the outside.

In this way, in order to scrape the ground a little wider than the inner diameter of the pile or to excavate a little wider around the tip of the pile after the end of drilling, a hole-reinforcing bit or a hole-reinforcing auger is applied.

A conventional hole-reinforcing bit or hole-reinforcing auger is composed of a structure in which an expansion structure is provided on the side of the excavation rod and is unfolded by the operation of a separately provided mechanical device for normal and reverse rotation or expansion.

However, the conventional hole expander auger needs to have a separate complex mechanical device or hydraulic device to expand or fold the expander auger, and because of this, the hollow part through which air usually passes is used as a space for the operation of the mechanical device or hydraulic device, or a complicated additional configuration. There was a problem that required .

In addition, conventionally, it is configured to be folded during forward rotation and unfolded during reverse rotation, so that the expanded part must be folded by forward rotation again after expansion drilling, but at this time, a malfunction that is not completely folded occurs, causing a problem in the recovery step.

Republic of Korea Patent Publication No. 10-2011-0103787 (published on September 21, 2011) Republic of Korea Patent Publication No. 10-2019-0125601 (2019.11.07. Publication) Republic of Korea Registered Patent Publication No. 10-1342134 (2014.01.06. Notice) Japanese Unexamined Patent Publication No. 2005-200909 (published on July 28, 2005) Japanese Unexamined Patent Publication No. 2001-207768 (published on August 3, 2001) Japanese Unexamined Patent Publication No. 2010-209678 (published on September 24, 2010)

Therefore, the present invention for solving the above-mentioned problems in the prior art, in hard ground such as weathered soil and weathered rock, can be drilled by widening the diameter of the lower end of the drilling hole even with a conventional drilling method that rotates while pressing without separate mechanical manipulation or malfunction. The purpose is to provide an auger and a method for constructing an enlarged pile using the same, in which the auger wing is expanded and drilled by downward movement without separate mechanical manipulation and malfunction, and the auger wing can be folded and retrieved only by upward movement.

The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to one aspect of the present invention for achieving the objects and other features of the present invention, after forming a drilling hole in the ground or bedrock, an expansion hole is detachably coupled to the excavation rod to form an expansion hole at the bottom of the drilling hole. In the auger, a connection part formed at the upper end to be connected to the lower end of the excavation rod, an auger wing accommodating part formed on the front surface of the lower end to accommodate the auger wing, a hinge pin accommodating hole for preventing the hinge pin from leaving, and an inside An auger housing including a through hole formed as a passage for air and injection material in the auger housing, the outer diameter of which is less than the inner diameter of the perforated hole; and an auger wing coupling portion inserted into the auger wing accommodating part of the auger housing, and separation from the auger housing. A pair of auger wings including a hinge pin through-hole through which a hinge pin to prevent the auger housing passes, and an auger wing protrusion protruding out of the outer diameter of the auger housing; and penetrating the hinge pin through-hole and entering the hinge pin receiving hole. A hinge pin that prevents separation of the auger wing and the auger housing by combining; and a plurality of auger tips provided on the front side of the auger wing to crush the ground, wherein the auger wing accommodating part is formed to transmit rotational force and downward pressing force in a state in which the auger wing is unfolded. A wing accommodating part and a second auger wing accommodating part formed deeper than the first auger wing accommodating part at the center to increase resistance to rotational force even in the process of unfolding the auger wing, and the auger wing coupling part of the auger wing A second augmentor wing coupling part formed to correspond to the first augmentor wing accommodating unit, and a first augmentor wing coupling part formed to correspond to the second augmentor wing accommodating unit, wherein the second augmentor wing accommodating unit comprises: When viewing a pair of auger wings, one side auger wing accommodating portion accommodating the first auger wing coupling portion of one auger wing and the other auger wing accommodating portion accommodating the first auger wing coupling portion of the other auger wing in plan view, Based on the central axis in the longitudinal direction of the hinge pin, the width of one side and the other side of the false wing receiving portion are formed differently, and the widths formed relatively large in each of the one side and the other false wing receiving portion are mutually It is made to be formed on the opposite side, and a side wall part facing a part of the side surface of each of the first auger wing coupling portion is formed in the second auger wing accommodating portion, so that both side surfaces of each of the first auger wing coupling portion are formed in the second auger wing coupling portion. It is made to be supported in the auger wing receiving part, and in the state where the steel pipe casing is installed in the ground or rock to prevent the collapse of the hole wall at the same time as the drilling of the drilling hole, the center of the hinge pin As the pair of auger wings are rotated to unfold, the auger wing protrusions extend outside the outer diameter of the perforated hole, thereby forming a reinforced auger by drilling the ground with an outer diameter wider than the outer diameter of the perforated hole. do.

According to another aspect of the present invention, in the reinforced pile construction method of drilling the ground to form a drilled hole and forming a reinforced hole at the lowermost end of the drilled hole to insert and fix the concrete pile, the ground is drilled with a predetermined diameter to a predetermined depth. A first step of forming a perforation hole until; A second step of forming an expansion hole by additionally perforating a lower end of the perforation hole to a predetermined depth with a diameter larger than the diameter of the perforation hole using the expansion auger according to the above aspect; A third step of removing slime from the bottom of the expansion hole; A fourth step of injecting an injection material such as cement milk or mortar into the enlarged hole; There is provided a reinforced pile construction method comprising a; fifth step of inserting a pre-manufactured concrete pile into the drilled hole.

In another aspect of the present invention, a first-first step of installing a steel pipe casing preventing collapse of the hole wall simultaneously with drilling of the drilling hole; may further include.

According to the expansion auger and the expansion pile construction method using the same according to the present invention, the following effects are provided.

First, the present invention has the effect of being able to perform the folding of the auger wings for expansion and recovery of the auger wings for the expansion drilling operation without a separate mechanical configuration.

Second, in the present invention, even if the auger wing is not completely folded by its own weight when the auger wing is recovered, when the excavation rod (excavation rod with a screw attached) is lifted, it can be naturally folded by being caught at the bottom of the drilling hole, thereby eliminating malfunction in the recovery step. There is no need for the operator to focus attention on the depth at which the auger wing should be unfolded and folded, which has the effect of improving workability.

Third, the present invention has the effect of securing functionality and manufacturability by enabling the folding and unfolding of the auger wing while having a simple structure.

Fourth, the present invention has an effect of increasing the hole expansion ratio because the auger wing is provided by utilizing the entire space of the lower surface of the excavation rod, rather than the relatively narrow side, so that it can be expanded and folded.

Fifth, the present invention does not require a separate and complicated mechanical device for unfolding the auger wing, so that the air passage of the excavation rod can be fully used.

Sixth, the present invention has the effect of securing applicability because it can be easily replaced and installed at the lower end of the excavation rod without separate equipment modification that performs the unfolding and folding function.

The effects of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a view showing a conventional general pile construction device.
2 is a view showing a hole expansion auger and a hole expansion drilling construction state of a hole expansion auger according to the present invention.
3 is a view showing a state in which a slime blocking means is provided in an excavation rod to which a screw is attached constituting a hole expansion auger according to the present invention.
4 is an exploded perspective view showing an exploded hole expansion auger assembly constituting a hole expansion auger according to the present invention.
5 is a side view showing a hole expansion auger assembly constituting a hole expansion auger according to the present invention, which is partially cut away.
6 is a view showing an example of coupling of a pair of auger wings constituting a hole expander auger assembly of a hole expander auger according to the present invention.
7 is a view showing another type of auger tip applied to the auger wing constituting the hole expander auger assembly of the hole expander auger according to the present invention.
8 is a side view showing another embodiment of a hole expander auger assembly constituting a hole expander auger according to the present invention, which is partially cut away.
9 is a view schematically showing the construction process of the expansion pile using the expansion auger according to the present invention.
10 shows an embodiment of a separation means for spacing a certain distance between the bottom of the expansion part and the bottom of the pile in the expansion pile according to the present invention.

Additional objects, features and advantages of the present invention may be more clearly understood from the following detailed description and accompanying drawings.

Prior to the detailed description of the present invention, the present invention may make various changes and may have various embodiments, and the examples described below and shown in the drawings are not intended to limit the present invention to specific embodiments. No, it should be understood to include all changes, equivalents or substitutes included in the spirit and scope of the present invention.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In addition, terms such as "...unit", "...unit", and "...module" described in the specification mean a unit that processes at least one function or operation, which is hardware, software, or hardware and It can be implemented as a combination of software.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

Hereinafter, a hole reinforcement auger and a method for constructing a hole reinforcement pile using the same according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a hole expansion auger according to the present invention will be described in detail with reference to FIGS. 2 to 6 . 2 is a view showing a hole expansion auger and a hole expansion drilling construction state of the expansion auger according to the present invention, Figure 3 is a screw-attached drilling rod constituting the hole expansion auger according to the present invention Showing a state in which a slime blocking means is provided it is a drawing 4 is an exploded perspective view showing an exploded hole expansion auger assembly constituting a hole expansion auger according to the present invention, and FIG. 5 is a side view showing a hole expansion auger assembly constituting a hole expansion auger according to the present invention, which is partially cut away and shown, 6 is a view showing an example of coupling of a pair of auger wings constituting a hole expander auger assembly of a hole expander auger according to the present invention.

As shown in FIGS. 2 to 6, the hole expansion auger according to the present invention forms a drilling hole (H1) in the ground and forms an expansion hole (H2) at the bottom of the drilling hole. ) includes a drilling rod 10 to which it is attached, and a hole expansion auger assembly A coupled to the lower end of the drilling rod. At the top of the excavation rod 10, a rotational force can be applied by a motor and a mechanical device for performing a general drilling operation capable of moving the excavation rod 10 up and down is connected (see FIG. 1).

Specifically, as shown in FIGS. 2 to 6, the expansion auger according to the present invention forms a drilling hole (H1) in the ground or bedrock, and forms an expansion hole (H2) at the bottom of the drilling hole (H1). In the hole expansion auger, the rotational force of the motor (M) provided at the top is transmitted to the bottom, and a passage is formed to deliver air to the inside, and a spiral-shaped continuous screw 11 is usually provided on the outside to Excavation rod 10 equipped with a screw 11 for transporting the crushed soil to the top; And an upper part is coupled to the lower part of the excavation rod 10, a through hole 140, which is a movement passage for air and injection material, is formed therein, and a pair of auger wings provided at the lower part are provided to be able to be expanded and folded by their own weight It is configured to include; an enlarged hole auger assembly (A).

The excavation rod 10 equipped with the screw 11 allows upward movement of the ground or bedrock with respect to the slime (slime) generated when the ground or bedrock is crushed by the pair of auger wings 200, and At least one slime blocking means 12 configured on the screw 11 is provided to block movement in the direction.

As shown in FIG. 3, the slime blocking means 12 may be formed of a bent pipe member having a lower end (one end) communicating with the screw 11 and an upper end (the other end) being open laterally. In FIG. 3 , a solid arrow indicates an upward movement direction of slime, and a dotted arrow indicates a downward movement direction of slime. In FIG. 3, the solid arrow indicates the upward movement direction of the slime when high-pressure air is injected through the through hole 140 provided in the expansion auger assembly A of the present invention, and the dotted arrow indicates the inside of the drilled hole after the high-pressure air injection is completed. This is the downward movement direction by the gravity of the slime remaining in the . By using the slime blocking means 12, high-pressure air is sprayed to remove the slime and the remaining slime and foreign matter falling from the upper part of the perforation hole are blocked until the injection material 420 is injected through the through hole 140. Contamination due to slime at the lower part of the hole can be minimized.

Next, the hole expansion auger assembly (A) is provided with a connection part 110 detachably coupled to the lower end of the excavation rod 10 to which the screw 11 is attached, and the passage of air and injection material therein. A through hole 140 is formed, and a pair of auger wings 200 provided to be able to be unfolded and folded by their own weight are provided on the lower bottom portion.

The expansion auger assembly (A) largely includes an auger housing 100; A pair of August Wings (200); and a hinge pin 300.

Specifically, in the hole expansion auger assembly (A), a connection portion 110 detachably coupled to the lower end of the drilling rod 10 to which the screw 11 is attached is formed on the upper side, and a pair is formed on the front surface of the lower end. The auger wing accommodating portion 120 for accommodating the auger wing 200 of the auger wing is provided, the hinge pin accommodating hole 130 is formed to prevent the separation of the hinge pin 300, and the air and injection material movement passage therein An auger housing 100 in which a through hole 140 is formed and whose outer diameter is equal to or less than the inner diameter of the perforated hole; An auger wing coupling portion 210 inserted into the auger wing accommodating portion 120 of the auger housing 100, and a hinge formed in the auger wing coupling portion 210 and preventing separation from the auger housing 100 The hinge pin through hole 220 through which the pin 300 passes, and the auger wing protrusion 230 integrally protruding from the auger wing coupling part 210 and extending so as to protrude out of the outer diameter of the auger housing 100 ) A pair of auger wings 200 having; And a hinge pin 300 that penetrates the hinge pin through hole 220 and is coupled to the hinge pin accommodating hole 130 to prevent separation of the auger wing housing 100 and the auger wing 200. do.

The excavation rod 10 can be extended along its length, and its lower end is usually a hexagonal female shape and its upper end is a hexagonal male shape, and a pin is inserted from the side to connect unit members to facilitate transmission of rotational force. . In accordance with the connection standard of the conventional excavation rod 10, as shown in FIGS. 4 to 8, the connection portion 110 of the hole expansion auger assembly A of the present invention is formed in a hexagonal male shape and fixed by inserting a pin into the side surface. It is preferable to have pin coupling holes (111a, 111b) that can be made. Of course, the shape or standard of the connecting portion may be changed to transmit rotational force and vertical force in correspondence with the lower end of the excavation rod 10.

When this expansion auger assembly A touches the lower part of the drilling hole, the auger wing 200 is unfolded and the auger wing protrusion 230 extends outside the outer diameter of the drilling hole, forming the drilled hole H1 (see FIG. 2). ) By drilling the ground with an outer diameter wider than the outer diameter of the hole (H2) (see Fig. 2) is formed. Therefore, it is possible to perform enlarged hole drilling in the same way as in general drilling and turning in one direction while pressing the auger wing 200 without a separate device or operation.

The auger wing accommodating portion 120 of the auger housing 100 applies rotational force and downward pressing force to the bottom surface of the auger wing protrusion 230 (opposite side in the drilling direction) in a state in which each of the auger wings 200 is unfolded. first auger wing accommodating portion 121 formed in the form of a groove so as to be delivered to the surface), and the first auger wing accommodating portion 121 to increase resistance to rotational force in a state in which each of the auger wings 200 is unfolded. ) It is formed deeper in the central part of the auger wing and includes a second auger wing accommodating portion 122 accommodating the auger wing coupling portion 210.

The first auger wing accommodating part 121 and the second auger wing accommodating part 122 accommodate the bottom part of the auger wing 200 (the part opposite the perforation direction).

In other words, the second auger wing accommodating portion 122 is formed in the form of a groove in the center of the auger housing 100, and a pair of auger wings 200 overlapping in a portion in the coupling direction of the hinge pin 300, respectively It is formed to commonly accommodate the auger wing coupling part 210 of the auger wing, and the first auger wing accommodating part 121 is formed at a position in a diagonal direction from the second auger wing accommodating part 122, respectively, to form a pair of auger wings. It is formed to accommodate a part of the bottom side of each of the auger wing protrusions 230 of the wings 200.

As will be described below, the first auger wing accommodating portion 121 accommodates the second auger wing coupling portion 212 of the auger wing coupling portion 210 of the auger wing 200, and the second auger wing accommodating portion 122 accommodates the first auger wing coupling portion 211 of the auger wing coupling portion 210 of the auger wing 200.

In addition, as the pair of auger wings 200 are accommodated in the second auger wing accommodating portion 122, as shown in FIG. 6, the second auger wing accommodating portion 122 and the auger wing coupling portion The first auger wing coupling part 211 of 210 is formed to have different widths on both sides of the central axis of the hinge pin 300 to transmit rotational force.

That is, when each of the auger wing coupling parts 210 of the pair of auger wings 200 are accommodated in the second auger wing accommodating part 122 and coupled to the auger wing housing 100 through the hinge pin 300, As shown in FIG. 6, based on the center line CL of the hinge pin 300 (a line orthogonal to the rotational axis of the hinge pin), the distance L1 to one side and the distance L2 to the other side are formed differently, which is Each of the wings 200 has a structure capable of resisting rotational force independently of each other. In the stage where the auger wing 200 is unfolded, the first auger wing coupling part is not completely accommodated in the first auger wing accommodating portion, so the resistance to rotation of the auger wing 200 is weak. As described above, the second auger wing coupling portion By forming different distances between L1 and L2, rotational force can be transmitted even when the auger wing 200 is not completely unfolded.

Next, the pair of auger wings 200 are spread in opposite directions, and one hinge pin 300 passing through all of the hinge pin through holes 200 prevents separation from the auger housing 100 are provided

Specifically, the auger wing 200 is formed in the auger wing coupling portion 210 inserted into the auger wing accommodating portion 120 of the auger housing 100 and the auger wing coupling portion 210, The hinge pin through hole 220 through which the hinge pin 300 that prevents separation from the housing 100 passes, and the auger wing coupling part 210 integrally protruding and formed outside the outer diameter of the auger housing 100 It is formed with an auger wing protrusion 230 extending to protrude.

The first auger wing coupling portion 211 of the auger wing coupling portion 210 is a first auger wing coupling portion bottom surface 211a in contact with the bottom surface of the second auger wing accommodating portion 122, which is one plane (straight line). It is formed of a second auger wing coupling portion bottom surface 211b that rotates at a certain angle and contacts the bottom surface of the second auger wing accommodating portion 122, and the first auger wing coupling portion bottom surface 211a and the second auger wing coupling portion The space between the bottom surfaces 211b is formed as a curved surface.

The first auger wing coupling portion 211 of the auger wing coupling portion 210 has a first auger wing coupling portion bottom surface 211a and a second auger wing coupling portion bottom surface 211b centered on the hinge pin 300. 2 The rotation of the auger wing 200 is limited within the range of contact with the bottom surface of the auger wing accommodating part 122.

In other words, the bottom surface of the first auger wing coupling portion 211 includes a first auger wing coupling portion bottom surface 211a in contact with the bottom surface of the second auger wing accommodating portion 122, and a first auger wing coupling portion bottom surface ( 211a) and a second auger wing coupling portion bottom surface 211b formed continuously with the first auger wing coupling portion bottom surface 211a with an angle difference by a predetermined angle.

In addition, the auger wing coupling portion 210 has an auger wing coupling portion outer surface 211c formed continuously with the first auger wing coupling portion bottom surface 211a, and an auger facing the auger wing coupling portion outer surface 211c. An inner surface 211d of the wing coupling portion is formed.

The first auger wing coupling part bottom surface 211a and the second auger wing coupling part bottom surface 211b form an angle difference, and the outer surface 211c of the auger wing coupling part and the inside surface 211d of the auger wing coupling part are parallel. The difference in angle in this state is because the auger wing 200 is rotated by the amount of the angle difference. That is, as the auger wing 200 rotates, the bit coupling part 120 accommodated in the inner space of the bit housing body 200 among the auger wings 200 smoothly rotates within the second auger wing accommodating part 122. It is to form a curved surface by removing unnecessary parts so that it can be done. Therefore, the angle difference between the first auger wing coupling part bottom surface 211a and the second auger wing coupling part bottom surface 211b, and the state in which the outer surface 211c of the auger wing coupling part and the inside surface 211d of the auger wing coupling part are parallel The angle difference generated in is preferably the same as the angle at which the auger wing 200 is to be rotated.

In addition, the bottom surface 211b of the second auger wing coupling portion and the inner surface 211d of the auger wing coupling portion are the bottom surface of the second auger wing accommodating portion 122 and the second auger wing when the auger wing 200 is rotated and folded. By coming into contact with the side surface of the accommodating portion 122, it also serves to support the rotated state of the auger wing 200.

Subsequently, the auger tip 240 for drilling the ground is provided on the uncoupled exposed surface of the auger wing 200 (ie, the surface facing the bottom of the expansion hole).

The auger tip 240 is a component that directly scrapes the ground, and is made of a material having excellent resistance to abrasion, and its size and spacing may be formed in various ways according to the characteristics of the ground.

7 is a view showing another type of auger tip applied to the auger wing constituting the hole expander auger assembly of the hole expander auger according to the present invention, the exposed surface of the auger wing 200 is provided with a solid carbide button 250 Can drill hard ground.

In addition, between the auger wing accommodating portion 210 of the auger housing 100 and the wing auger 200, it communicates with the through hole 140 in the center of the auger housing 100, and the communication passage 261 through which air or injection material passes, 262) can be formed.

Specifically, the communication passages 261 and 262 include a first communication passage 261 formed in the auger wing 200 to communicate with the through hole 140 of the auger housing 100, and the auger housing 100 ) is formed as a second communication passage 262 formed on the sidewall of the auger wing accommodating portion 120.

8 is a side view showing another embodiment of a hole expander auger assembly constituting a hole expander auger according to the present invention, which is partially cut away.

As shown in FIG. 8, in the hole expander auger assembly A constituting the hole expander auger according to the present invention, a pair of auger wings 200 are rotatable to the auger housing 100 through each hinge pin 310 Since other configurations are the same as those described above, a detailed description thereof will be omitted.

The hole expanding auger according to the present invention configured as described above, without a separate mechanical configuration for unfolding the auger wing 200, expands the auger wing 300 with the same operation (pressing and turning in one direction) as in general drilling. Even at the time of recovery, the auger wing 200 can be automatically folded and recovered by contacting the bottom of the drilling hole narrower than the gravity or expansion hole while moving upward without the need for a separate mechanical operation.

Next, a method for constructing a reinforced pile using a reinforced auger according to the present invention will be described in detail with reference to FIGS. 9 to 10.

9 to 10 are diagrams schematically showing the construction process of the expansion pile using the expansion auger according to the present invention.

9 (a) is a cross-sectional view of forming a drilling hole by mounting a general auger without a hole expansion function at the bottom of the excavation rod 10, and FIG. This is the stage where the Ogre Wing has not unfolded in one form. 9(c) is a state in which the auger wings 200 of the hole expansion auger are spread out to form an expansion hole, and FIG. . 9(e) shows a state in which the pile 400 is inserted into the hole and the construction of the pile is completed. In this way, through the process of FIG. 9, the expansion pile can be constructed using the expansion auger of the present invention.

The method for constructing a reinforced pile using a reinforced auger according to the present invention is a method for constructing a reinforced pile for forming a drilled hole in the ground and inserting a pile made of concrete material previously manufactured in a factory into the drilled hole, as shown in FIG. As such, a first step of drilling the ground to a predetermined diameter to form a drilling hole to a predetermined depth; A second step of additionally drilling a lower end of the drilling hole to a predetermined depth with a larger diameter than the diameter of the drilling hole using the aforementioned expanding auger to form an expanding hole; A third step of removing the slime at the bottom of the expansion hole; A fourth step of injecting an injection material such as cement milk or mortar into the expansion hole; and a fifth step of inserting a concrete pile prefabricated in a factory into a drilling hole.

The method for constructing a reinforced pile using a hole-reinforcing auger of the present invention is a first step of installing a steel pipe casing that prevents collapse of the hole wall at the same time as the drilling of the drilling hole before the second step after the first step is finished, or at the same time as the first step. Step 1; may further include.

Here, the present invention can apply the SDA method (separated donut auger), which is a method of drilling a drilling hole with a general auger, and at the same time turning the steel pipe casing equipped with a ring bit at the tip in the opposite direction to drill the drilling hole. That is, if necessary, the first step and the 1-1 step may be performed at the same time.

In the execution of the second step, after the completion of the first step and before the start of the second step, after the drilling hole is formed, the general auger without the hole expansion function at the bottom of the excavation rod is replaced with the hole expansion auger assembly (A), or the general hammer bit is replaced as described above. It can be implemented by replacing with the enlargement auger assembly (A).

In addition, the execution of the second step, after the completion of the first step, including the drilling rod and the general auger (general hammer bit) used when forming the drilling hole, the drilling rod having the slime blocking means and the hole expansion auger assembly (A) It can be implemented by replacing it with an enlargement auger.

In the third step, the slime generated during drilling of the drilling hole and the expansion hole is discharged upward using a screw and compressed air provided in the excavation rod at the same time as drilling. The slime remaining on the bottom of the expansion hole may be discharged by spraying air immediately after the completion of drilling the expansion hole.

In addition, when the slime is discharged in the third step, the slime blocking means described above allows the upward movement of the slime when air is injected from the hole expansion auger, and blocks the downward movement due to free fall when the air injection is stopped.

In addition, the fifth step may be performed after providing a separation means for separating a certain distance between the lower end of the expansion hole and the lower end of the pile at the lower end of the concrete pile.

As shown in (a) of FIG. 10, the separation means 410 may be composed of a coupling plate 411 and a support 412 supporting the pile 400 and a bracket 413 firmly connecting them. there is. Here, as shown in (b) of FIG. 10 , a separate lower support plate 414 may be provided at the lower end of the support 412 .

The separation means and the lower end of the pile 400 may be coupled by welding or bolting.

As described above, since the separation means is provided, the load at the bottom of the pile is evenly distributed over the entire bottom area of the bottom of the expansion hole, and the injection material (cement milk or mortar) is provided while the bottom of the concrete pile is separated from the bottom of the expansion hole etc.) to harden.

In addition, frictional force enhancing means formed of irregularities and/or protrusions is further formed on the outer circumferential surface of the lower end of the pile, so that the load of the pile can be more evenly transmitted to the ground through the injection material.

Subsequently, the present invention may further include a sixth step of hitting the upper end of the pile downward several times after the fifth step.

The above-mentioned pile 400 can use a concrete pile produced in a normal factory, and if necessary, a steel pipe pile and a composite pile combining steel pipe and concrete can also be applied in the same way.

As described above, according to the expansion auger and the expansion pile construction method using the same according to the present invention, the expansion of the auger wing for the expansion drilling operation and the folding of the auger wing for recovery can be performed without a separate mechanical configuration, and the winger Even if the wing is not completely folded due to its own weight when retrieving the wing, when lifting the excavation rod, it can be naturally folded as it is caught at the bottom of the drilling hole, eliminating malfunction during the recovery phase and allowing the equipment operator to focus on the depth to which the auger wing should be unfolded and folded. There is an advantage that workability can be improved because there is no need.

In addition, according to the present invention, it is possible to secure functionality and manufacturability by enabling the expansion and folding of the auger wing while having a simple structure, and by utilizing the entire space of the lower surface of the excavation rod rather than the relatively narrow side, the auger wing Since it is provided and can be unfolded and folded, there is an advantage in that the expansion rate can be increased.

In addition, the present invention does not require a separate complicated mechanical device for unfolding the auger wing, so that the air passage inside the excavation rod can be fully used, and only the expansion auger can expand the excavation rod without remodeling the equipment that performs the unfolding and folding function. It has the advantage of securing applicability because it can be easily replaced and installed at the bottom.

The embodiments described in this specification and the accompanying drawings merely illustrate some of the technical ideas included in the present invention by way of example. Therefore, since the embodiments disclosed in this specification are not intended to limit the technical idea of the present invention but to explain it, it is obvious that the scope of the technical idea of the present invention is not limited by these embodiments. All modified examples and specific examples that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be construed as being included in the scope of the present invention.

A: Expander auger assembly
10: excavation rod
11: screw
12: slime blocking means
100: auger housing
110: connection part
111a, 111b: pin coupler
120: Auger wing receiving part
121: first auger wing receiving part
122: second auger wing accommodating part
130: hinge pin receiving hole
140: through hole
200: ogre wing
210: auger wing joint
211: first auger wing coupling part
211a: bottom surface of the first auger wing coupling
211b: bottom surface of the second auger wing coupling
211c: outer surface of the auger wing coupling part
211d: inner side of auger wing coupling part
212: second auger wing coupling part
220: hinge pin through hole
230: Auger wing protrusion
240: auger tip
250: carbide button
300: hinge pin
261: first communication flow path
262: second communication flow path
300: hinge pin
400: pile
410: separation means
411: bonding plate
412: support
413: bracket
414: lower support plate
420: injection material

Claims (3)

In the expansion auger detachably coupled to the excavation rod of the drilling equipment,
The connection part 110 formed at the upper end so as to be connected to the lower end of the excavation rod 10, the auger wing accommodating part 120 formed on the front surface of the lower end and accommodating the auger wing 200, and the hinge pin 300 An auger housing 100 including a hinge pin accommodating hole 130 preventing separation and a through hole 140 formed as a movement passage for air and injection material therein, the outer diameter of which is less than or equal to the inner diameter of the perforation hole;
A hinge pin through hole 220 through which an auger wing coupling part 210 inserted into the auger wing accommodating part 120 of the auger housing 100 and a hinge pin preventing separation from the auger housing 100 pass through , and a pair of auger wings 200 including auger wing protrusions 230 protruding out of the outer diameter of the auger housing 100;
A hinge pin 300 that penetrates the hinge pin through hole 220 and is coupled to the hinge pin receiving hole 130 to prevent separation of the auger wing 200 and the auger housing 100; and
A plurality of auger tips 240 provided on the front of the auger wing 200 to crush the ground;
The auger wing accommodating portion 120 includes the first auger wing accommodating portion 121 formed to transmit rotational force and downward pressing force in a state in which the auger wing 200 is unfolded, and the auger wing in the unfolding process. It includes a second auger wing accommodating portion 122 formed deeper than the first auger wing accommodating portion 121 in the central portion to increase resistance to rotational force,
The auger wing coupling portion 210 of the auger wing 200 includes a second auger wing coupling portion 212 formed to correspond to the first auger wing accommodating portion 121, and the second auger wing accommodating portion 122 ) And a first auger wing coupling part 211 formed corresponding to,
The second auger wing accommodating part 122 includes one auger wing accommodating part accommodating the first auger wing coupling part 211 of one auger wing of the pair of auger wings 200 and the other auger wing. When viewed in plan view of the other ogre wing accommodating part accommodating the first ogre wing coupling part 211, the width of one ogre wing accommodating part and the width of the other ogre wing accommodating part based on the central axis in the longitudinal direction of the hinge pin 300 The first auger wing accommodating part 122 has a relatively large width formed on opposite sides of each other, but the first auger wing accommodating part 122 has a relatively large width. A side wall portion 122a is formed on which a part of each side of the wing coupling portion 211 faces, so that both side surfaces of each of the first Auger wing coupling portion 211 are within the second Auger wing accommodating portion 122 made to be supported
In the state where a steel pipe casing is installed in the ground or rock to prevent collapse of the hole wall at the same time as the drilling of the drilling hole, when it reaches the lower part of the drilling hole to form an enlarged hole at the bottom of the drilling hole, it rotates around the hinge pin and a pair of auger wings unfold Characterized in that the auger wing protrusion extends outside the outer diameter of the drilled hole while drilling the ground with an outer diameter wider than the outer diameter of the drilled hole to form a reinforced hole.
Auger Auger.
In the reinforced pile construction method of drilling the ground to form a drilled hole and forming a reinforced hole at the lowermost end of the drilled hole to insert and fix the concrete pile,
A first step of drilling the ground to a predetermined diameter to form a drilling hole to a predetermined depth;
A second step of additionally drilling a hole at a lower end of the drilling hole to a predetermined depth with a larger diameter than the diameter of the drilling hole using the drilling auger according to claim 1;
A third step of removing slime from the bottom of the expansion hole;
a fourth step of injecting an injection material into the enlarged hole;
Characterized in that it comprises a; fifth step of inserting a pre-manufactured concrete pile into the drilling hole
How to construct a reinforced pile.
According to claim 2,
Characterized in that it further comprises; a 1-1 step of installing a steel pipe casing preventing collapse of the hole wall at the same time as the drilling of the drilling hole
How to construct a reinforced pile.

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