KR101817200B1

KR101817200B1 - Removal helical anchor apparatus reinforcement construction method using the same

Info

Publication number: KR101817200B1
Application number: KR1020150047592A
Authority: KR
Inventors: 강홍덕; 나종열; 김영욱; 김낙경
Original assignee: 주식회사 한국지오콘
Priority date: 2015-04-03
Filing date: 2015-04-03
Publication date: 2018-01-10
Also published as: KR20160118821A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removal helical anchor device and a ground reinforcement method using the same, and more particularly, to a helical anchor device having a helical anchor having a plurality of helical wings, And cost reduction by material reuse.
In the helical anchor device of the present invention, the helical anchor device includes a steel pipe main body, a plurality of helical wings having a shape spirally surrounding the outer surface of the steel pipe main body and spaced apart from each other, Wow; The helical anchor is installed at the entrance of the ground where the helical anchor is press-fitted. The helical anchor is provided with a cylindrical outer shape. The helical anchor is prevented from flowing out of the soil caused by the press-in of the ground of the helical anchor. And a blocking cap having a through hole formed therein.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a helical anchor device, and a ground reinforcement method using the same.

The present invention relates to a ground reinforcement method, and more particularly to a ground reinforcement method, which uses a helical anchor provided with a plurality of helical wings, simplifies and simplifies the construction method without requiring grouting, reduces noise and vibration, reduces costs by shortening air and reusing materials The present invention relates to a removal helical anchor device and a ground reinforcement method using the same.

Grounds generated by large-scale land development, roads, railway construction, etc., are subject to local ground collapse or rockfall due to rainfall or precipitation, Because it can cause damage, various ground reinforcement methods are being developed to prevent the ground collapse.

Currently, these ground reinforcement methods can be largely divided into soil nailing method and earth anchor method method. The soil nailing method is a method of reinforcing the ground by grouting the reinforcement grout after press-fitting the deformed reinforcing bar which is the shear stress material into the drilled hole relatively closely drilled in the ground. Since the tensile stress material is not used as the reinforcing material, And is mainly applied to the soil layer.

In addition, the earth anchor method is a method of reinforcing the ground by pressuring the PC steel wire, which is a tensile stress material, on the drilled hole in the ground, grouting the reinforcing grout, and pulling the PC steel wire, and compressing the ground by the tensile stress of the PC steel wire It is mainly applied to the rock layer.

1A to 1D are reference views for explaining a ground reinforcement method according to the earth anchor method of the related art.

As shown in FIG. 1A, the ground reinforcement method according to the related art includes a step of drilling the perforation hole 12 in the ground 11 using the perforation equipment (FIG. 1A), a step of pressing the anchor 13 in the perforation hole 12 A step 1c of filling a void portion between the perforation hole 12 and the anchor 13 by filling the cement grout material 14 and reinforcing the cement grout material 14 and the lid 15 at the inlet of the perforation hole 12, (1d). &Lt; / RTI >

When reinforcement of the ground 11 is completed by such a method, frictional resistance acts between the anchor 13 pressed into the perforation hole 12 by the filled grout material 14 and the inner peripheral surface of the perforation hole 12 The ground 11 of the ground could be reinforced so as not to collapse.

However, in the conventional ground reinforcement method, since the process of piercing the perforation hole 12 before filling the anchor 13 into the ground and filling the grout material 14 in the ground has been preceded, the air is increased and the cost is increased And there is a problem that the bottom settlement, noise and vibration occur due to the drilling operation.

Korean Patent Laid-Open Publication No. 2014-0120124 (Oct. 13, 2014)

It is therefore an object of the present invention to provide a helical anchor having a plurality of spiral blades, which simplifies and simplifies the construction method without requiring grouting, The present invention is to provide a removal helical anchor device and a ground reinforcement method using the same, which can reduce cost by reducing vibration and shortening the air and reusing materials.

In order to achieve the above object, a helical anchor device according to the technical idea of the present invention includes a steel pipe main body, a plurality of helical wings having a shape spirally surrounding the outer surface of the steel pipe main body, A helical anchor for pressing into the ground while rotating; The helical anchor is installed at the entrance of the ground where the helical anchor is press-fitted. The helical anchor is provided with a cylindrical outer shape. The helical anchor is prevented from flowing out of the soil caused by the press-in of the ground of the helical anchor. And a blocking cap having a through hole formed therein.

The helical wing of the helical anchor is formed with a front end portion and a rear end portion which are first pressed into the ground, and the excavating blade forming portion of the front end portion is formed to be inclined with respect to the diameter direction of the steel pipe body.

"&Quot;"

In addition, the spiral blade may be provided with a plurality of ribs in the form of a band extending from the tip end to the rear end along the rotation direction.

Further, the front end portion of the steel pipe main body may be chamfered at an angle.

The front end of the steel pipe main body is formed to have a narrow diameter to be inserted into and connected to the inside of the rear end portion of the other steel pipe main body so that a plurality of the helical anchors can be connected in series. can do.

A restraining protrusion is formed on the front end portion and the rear end outer surface of the steel pipe main body, and a restricting groove corresponding to the restraining protrusion of the steel pipe main body is formed on the inner side surface of the coupler to suppress relative rotation between the helical anchors connected to each other . &Lt; / RTI >

The concrete block may be installed on the ground surface to which the helical anchor is press-fitted, and the blocking plug may be formed in the inlet hole after forming the inlet hole in the concrete wall.

The fixing block may further include a fixed wedge which is interposed between the inner circumferential surface of the inlet hole of the concrete wall and the blocking cap to firmly fix the blocking cap to the concrete wall.

In addition, after the pressing of the helical anchor to the ground is completed, urethane is applied to the inlet hole of the concrete wall to be finished.

Meanwhile, the ground reinforcement method of the present invention includes the steps of forming a concrete wall in which concrete is inserted into a ground surface to be reinforced to form a lead-in hole; A step of providing a blocking cap having a cylindrical outer shape and a spiral through hole formed in the inlet hole formed in the concrete wall so as to block the soil generated when the ground of the helical anchor is press-fitted; A helical anchor according to any one of claims 1 to 6, which is rotated by a drilling machine, is press-fitted into a ground through a through hole of the cut-off plug.

In order to firmly fix the blocking cap when the blocking cap is installed in the inlet hole of the concrete wall, a fixed wedge is forcedly inserted between the inner circumferential surface of the inlet hole of the concrete wall and the blocking cap, and after the pressing of the helical anchor to the ground is completed The inlet hole of the concrete wall may be coated with urethane.

The helical anchor apparatus and the ground reinforcement method using the helical anchor apparatus according to the present invention use a helical anchor provided with a plurality of helical wings so that it is not necessary to perforate the ground or grout the grout material, There is no noise and vibration caused by this, and it is possible to reduce cost by shortening the air.

In addition, since the present invention is suitable for permanent reinforcement to the ground and can be easily removed from the ground, it can be re-constructed if it is erroneously constructed and useful for the construction work.

Also, according to the present invention, there is provided a cut-off stopper through which a helical anchor with a helical wing can rotate while being able to effectively block the outflow of the earth caused by the press-in of the helical anchor.

In addition, according to the present invention, the tip of the helical anchor is inclined so that the rotational resistance against the ground caused by the rotation and excavation of the helical wing is reduced, and the helical anchor is smoothly pressed.

Further, according to the present invention, the reinforcing rib is formed on the helical wing of the helical anchor, so that the problem that the helical wing easily breaks or bends can be reduced.

Figs. 1A to 1D are views for explaining a ground reinforcement method according to the earth anchor method of the related art
FIG. 2 is a view showing the state of use of the helical anchor device according to the embodiment of the present invention
3 is a side perspective view for explaining a configuration of a helical anchor device according to an embodiment of the present invention;
4 is a perspective view for explaining a configuration of a helical anchor in a helical anchor device according to an embodiment of the present invention.
5 is a plan view of a spiral wing of a helical anchor in a helical anchor device according to an embodiment of the present invention.
6 is a cross-sectional view taken along the line AA of FIG.
7 is a perspective view for explaining the configuration of the stopper in the helical anchor device according to the embodiment of the present invention.
8 is a flowchart for explaining a ground reinforcement method using a helical anchor device according to an embodiment of the present invention.
9 is a perspective view of a helical anchor for explaining a configuration of a helical anchor device according to a modified embodiment of the present invention

A helical anchor device and a ground reinforcement method using the same according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention, and are actually shown in a smaller scale than the actual dimensions in order to understand the schematic structure.

Also, the terms first and second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

2 is a use state diagram of a helical anchor device according to an embodiment of the present invention.

As shown in the drawings, a helical anchor device according to an embodiment of the present invention is a helical anchor device having a spiral wing 112 using a drill machine without drilling a perforation hole or filling a grout material on a ground requiring reinforcement, So that it is possible to effectively reinforce the ground by simply pressing the anchor 110 directly.

According to such a configuration, since the process of filling the perforation hole and filling the grout material therein is omitted, not only the air can be greatly shortened but also the cost is increased, the settlement of the bottom surface due to the perforating operation, can do.

Also, since the helical anchor 110 according to the embodiment of the present invention is not only suitable for permanent reinforcement to the ground but also can be easily removed from the ground, it can be reused in case of erroneous construction, .

Hereinafter, a helical anchor device according to an embodiment of the present invention and a ground reinforcement method using the same will be described. First, a helical anchor device according to an embodiment of the present invention will be described.

4 is a perspective view for explaining a configuration of a helical anchor in a helical anchor device according to an embodiment of the present invention, and FIG. 5 is a perspective view for explaining the configuration of a helical anchor device according to an embodiment of the present invention. 6 is a cross-sectional view taken along the line AA of FIG. 4; FIG. 6 is a plan view of a spiral wing of a helical anchor in a helical anchor device according to an embodiment of the present invention; And FIG. 7 is a perspective view for explaining the construction of the stopper in the helical anchor apparatus according to the embodiment of the present invention.

The helical anchor device according to an embodiment of the present invention includes a helical anchor 110, a stopper 120, a fixed wedge 130, a finishing member 140, and a concrete wall C , It is possible to reinforce the soft ground by a very simple construction process without the need of drilling or grouting of the ground.

Hereinafter, a helical anchor device according to an embodiment of the present invention will be described in more detail with reference to the respective components.

The helical anchor 110 is a core component of the helical anchor device and comprises a steel pipe main body 111 and a plurality of helical vanes 112 spaced apart from the outer surface front end of the steel pipe main body 111. Here, the steel pipe main body 111 is formed as a long solid solid or hollow member. It is preferable that the steel pipe main body 111 is provided with a hollow member so as to be connected to each other in such a manner that the steel pipe main body 111 is fitted to each other. So that it can be fitted to the rear end of the base 111. And a single-pipe type coupler 113 for fastening the steel pipe main body 111 to each other for connection. The coupler 113 is provided with a bolt hole 113b for bolt fastening and can securely connect two steel pipe bodies 111 around the coupler 113 by bolting. 6, a restraining protrusion 111a is formed on the front end portion and the rear end outer surface of the steel pipe main body 111 and the restricting protrusion 111a is formed on the inner side surface of the coupler 113 111a are formed to restrict relative rotation between the steel pipe main bodies 111 connected to each other.

In addition, the steel pipe main body 111 of the helical anchor 110 is chamfered so as to be sloped in a blade-like shape so that the steel pipe main body 111 can be smoothly press-fitted into the ground while being rotated by a drilling machine.

The spiral wing 112 in the helical anchor 110 is formed of a helical member surrounding the steel pipe main body 111. The helical wing 112 has a distal end portion 112a which contacts the ground first to start excavation, As shown in FIG. 5, a portion where the excavating blade 112c is formed on the tip portion 112a is formed to be inclined with respect to the diameter direction of the steel pipe body 111, When I saw "

When the excavating blade 112c is formed to be inclined with respect to the radial direction of the steel pipe body 111, when the helical blade 112 is viewed from above, as shown in FIG. 5, A larger clearance space 112e through which the soil can flow is formed between the rear end portions 111b and the gravels 112 contacting with the excavating blade 112c are smoothly sideways, Lt; / RTI >

The helical wing 112 of the helical anchor 110 is provided with a plurality of reinforcing ribs 112d in the form of a band extending from the leading end 111a to the trailing end 111b along the rotational direction thereof. It is preferable that the reinforcing rib 112d is formed in a circular cross-section, and the spiral wing 112, which is a spiral plate, rotates and can be effectively prevented from being easily broken or bent due to the resistance of the ground.

The cut-off plug 120 serves to cut off the gravel discharged from the ground due to the press-fitting of the helical anchor 110. For this, the blocking cap 120 has a cylindrical shape that is inserted in a manner corresponding to the inlet hole C1 of the concrete wall body C formed on the ground surface. 7, the through hole 122 may be formed in a shape corresponding to the helical anchor 110 so as to penetrate the helical anchor 110 as well as the steel pipe main body 111, And is formed through the inside of the body 121 of the blocking cap 120 in the form and size. In addition, the outer surface of the blocking cap 120 is formed with oblique grooves 123 whose width gradually decreases toward the front end. When a plurality of oblique grooves 123 are formed in the stopper 120 as described above, stretchability is imparted to the outer circumferential surface of the stopper 120. When foamed urethane is used as the closure member 140, Thereby improving the adhesion to the concrete wall body C.

The fixed wedge 130 serves to fix the blocking cap 120 firmly to the concrete wall C. For this purpose, the fixed wedge 130 is formed as a straight member thicker from the front end to the rear end, and is inserted between the inner peripheral surface of the inlet hole C1 of the concrete wall C and the stopper 120, It is possible to fix the blocking plug against the wall C.

The closure member 140 is formed of an expansion material such as foamed urethane or sponge for finishing the inlet hole C1 of the concrete wall after the helical anchor 110 is completely inserted into the ground. In the case of foamed urethane, in addition to the function of simply hiding it, the through hole 122 and the oblique groove 123 of the blocking cap 120, the inlet hole C1 of the concrete wall body C, Can faithfully fill in the gaps that exist between the components that make up the device.

The concrete wall C is formed in such a manner that the ground surface to be reinforced is vertically or obliquely laid and then laid. When the concrete is poured, the inlet hole C1 may be formed at the point where the helical anchor 110 is to be pressed So that it is preferable not to cause troubles or noise and vibration due to the drilling operation for forming the inlet hole C1.

The ground reinforcement method using the helical anchor apparatus according to the embodiment of the present invention will now be described with reference to FIG. 8 and other drawings. 8 is a flowchart for explaining a ground reinforcement method using a helical anchor device according to an embodiment of the present invention.

8, the ground reinforcement method according to the embodiment of the present invention includes a concrete wall forming step S101, a stopper installing step S102, a fixed wedge installing step S103, a helical anchor press fitting step S104, , And a finishing process step S105.

In the concrete wall forming step (S101), the ground surface to be reinforced is vertically or obliquely polished and then the concrete wall C1 is formed by pouring concrete. However, a plurality of inlet holes C1 are formed in advance at the point where the helical anchor 110 is to be pressed in when the concrete is poured.

In the blocking stop installation step S102, a blocking cap 120 having a spiral through hole 122 formed in the inlet hole C1 formed in the concrete wall C1 is inserted and positioned.

In the fixing wedge installation step S103, the blocking cap 120 is fixed by interposing the fixing wedge 130 between the inner circumferential surface of the inlet hole C1 of the concrete wall C and the blocking cap 120 with force.

In the helical anchor press-in step (S104), the helical anchor 110 is rotated by a drill machine and press-inserted into the ground through the through hole 122 of the cut-off plug 120. When the helical anchor 110 is pressed against the ground in this manner, the tip of the steel pipe body 111 formed in a blade shape of the helical anchor 110 is rotated to excavate the ground first, and then a plurality of helical blades 112 Continue to dig deeper into the ground while digging the ground continuously.

In the process of pressurizing the helical anchor 110, the gravel tends to flow out to the outside, but the outflow of the gravel is mostly blocked by the cut-off stopper 120 installed previously.

In the finishing step (S105), the foamed urethane which is the closing member 140 is applied to the inlet hole (C1) of the concrete wall body (C) in a sufficient amount. The foamed urethane can securely fill in the gaps existing in the inlet hole C1 of the concrete wall body C including the through hole 122 and the oblique groove 123 of the blocking plug 120 and to the inlet hole C1 It conceals it so that it is not exposed.

Meanwhile, the helical anchor 110 according to the embodiment of the present invention is not only suitable for permanent reinforcement to the ground but also can be easily removed from the ground, so if it is erroneously installed, it is rotated in the opposite direction to the drill machine, It is also possible to use it again when construction work is carried out before the construction of this structure is possible.

9 is a perspective view of a helical anchor for explaining a configuration of a helical anchor device according to a modified embodiment of the present invention.

As shown in the drawings, the helical anchor device according to the modified embodiment of the present invention is characterized in that the steel pipe main body 111 of the helical anchor 110 is not formed in a circular cylindrical shape or a circular tubular shape, but is formed in the form of a square pillar.

When the steel pipe main body 111 of the helical anchor 110 is formed in the shape of a quadrangular pole so as to prevent relative rotation of the helical anchors 110 relative to each other when the plurality of helical anchors 110 are connected by the coupler 113 It is unnecessary to form the restraining protrusions 111a and the restraining grooves 113a in the steel pipe main body 111 and the coupler 113 and likewise, And the like can be relaxed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

110: Helical anchor 111: Steel pipe body
112: spiral wing 113: coupler
120: blocking plug 122: through hole
130: Fixing wedge 140: Closing member

Claims

A helical anchor device for forming a concrete wall having an inlet hole formed by pouring concrete on a surface of a ground to be reinforced and press-fitting the ground through the inlet hole formed in the concrete wall,
A helical anchor which is composed of a plurality of helical blades having a shape spirally surrounding the outer surface of the steel pipe main body and spaced apart from each other and which is pressed into the ground through the inlet hole of the concrete wall while rotating; ;
And a blocking cap installed in the inlet hole of the concrete wall to block drainage of the soil generated due to the ground pressing of the helical anchor,
Wherein the helical wing of the helical anchor is formed with a tip portion that is first press-fitted into the ground with a stepped portion from a rear end portion and the excavating blade forming portion of the helical wing tip portion is formed in the shape of an inclined line with respect to the diametrical direction of the main body of the steel pipe, So that a clearance space through which the soil particles can flow can be formed between the front end portion and the rear end portion,
Wherein the blocking cap has a cylindrical outer shape so that it can be installed in the inlet hole of the concrete wall, and when the helical anchor is installed in the inlet hole of the concrete wall before the helical anchor is pressed into the ground, And a spiral through hole formed in a spiral shape from the front of the body through the inside in correspondence with the spiral wing,
The outer surface of the blocking cap is provided with a plurality of oblique grooves formed in a shape of gradually decreasing in width toward the front end portion in a circumferential direction of the outer surface so as to function as a space filled with foamed urethane,
The front end portion of the steel pipe main body is beveled at an angle,
The helical wing is provided with a plurality of rib-like reinforcing ribs in the form of a band extending from the tip end to the rear end along the rotation direction,
A front end portion of the steel pipe main body is formed to have a narrow diameter that is inserted into and connected to the inside of the rear end portion of another steel pipe main body so as to be able to connect a plurality of the helical anchors in a row, A restricting projection is formed on the outer surface of the front end portion and the rear end portion and a restricting groove corresponding to the restricting projection of the steel pipe body is formed on the inner side surface of the coupler to suppress relative rotation between the helical anchors connected to each other,
Further comprising a fixed wedge for interference fit between the inner circumferential surface of the inlet hole of the concrete wall and the blocking cap to firmly fix the blocking cap to the concrete wall,
Wherein the inlet hole of the concrete wall is coated with urethane after completion of press-fitting of the helical anchor to the ground.

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