KR101708800B1 - Wings stop earth anchor and reinforcement construction method using the same - Google Patents

Abstract

The present invention relates to a wing stop earth anchor device for reinforcing an inclined surface which is quickly and stably fixed in a drilled hole formed on an inclined surface to reinforce the ground and performs drilling work and grout material injection in addition to ground reinforcement when needed, and an inclined surface reinforcing method using the same. The wing stop earth anchor device comprises: an anchor body having a section with an inclined surface; a center bar mounted in an insertion hole of the anchor body; a wing member which is hung on an inner wall of a drilled hole and suppresses a backward movement of the anchor body when spread with respect to the anchor body; a restricting member having a ball holder installed on the inclined surface of the insertion hole of the anchor body and provided with a plurality of through holes arranged in a circumferential direction, a plurality of wedge balls positioned and seated in the through holes of the ball holder to move forwards with the ball holder and come in contact with the inclined surface of the anchor body and an outer circumferential surface of the center bar penetrating the anchor body to perform a wedge action to restrict the center bar with respect to the anchor body when the ball holder moves forwards, and release the center bar when the ball holder moves backwards, and a spring installed on a rear side of the ball holder to exhibit a propensity to stop a backward movement of the ball holder by an elastic force and allow a backward movement of the ball holder if a force of a prescribed level or higher is applied to suppress a forward movement of the center bar and allow a backward movement and rotation of the center bar; and a guide pipe mounted on a rear end of the anchor body to guide the anchor body while the center bar penetrates the anchor body.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wing top earth anchor device for reinforcing a slope and a slope reinforcement method using the same,

The present invention relates to an earth anchor for slope reinforcement, and more particularly, to an earth anchor for fastening and stably fixing a ground hole in a slope formed on a slope so that the ground can be reinforced if necessary, The present invention relates to a wing top earth anchor device for slope reinforcement and a slope reinforcement method using the same.

In general, excavation works such as underground excavation, bridge foundation excavation and slope excavation of buildings are carried out in almost all sites in order to construct social infrastructure facilities such as roads, railways, harbors, and residential facilities such as buildings and houses.

If the earth pressure generated during the excavation can sufficiently resist the shear strength of the ground, no additional reinforcement is required. For example, in the case of rock excavation with a very high shear strength of the ground, the rock is not collapsed and the stability is secured even when the slope of the cut surface is 90 degrees.

However, when excavation of soft ground with low shear strength is performed at 90 degrees, collapse of excavation ground occurs, so a separate reinforcement method is needed to secure the stability of excavation ground. Earth anchors and soil nailing are most widely used as ground reinforcement methods during excavation.

In the construction method using the earth anchor, the tensile material in which the fixation part is fixed is inserted into the perforated hole, the grout material is filled, and then the grout material is cured after a certain period of time. Then, the tensile material is buried in the ground and becomes fixed and partially exposed to the outside, and the exposed part is completed by fixing it to the earth retaining panel or vertical beam by using the fixing part. Through such construction, even if earth pressure or water pressure is generated, the ground can be stably supported by the earth anchor and can withstand without collapsing.

Recently, in connection with such an earth anchor, a type having a rotating wing as disclosed in Korean Patent Publication No. 2012-0092357 (Aug. 21, 2012) has been disclosed. In the case of the earth anchor provided with the pivoting blade, the earth anchor can be fastened to the perforation hole more quickly and stably by using the pivoting blade to extend over the perforation hole.

However, in the case of the earth anchor disclosed in Korean Patent Laid-Open Publication No. 2012-0092357 (Aug. 21, 2012), there is a problem in that the operator can not arbitrarily rotate the wing at an appropriate time because the wing has only a tendency to be unfolded by the spring at all times.

In addition, in the case of earth anchors according to the prior art, only the function of being supported by the perforation hole is performed. Therefore, the perforation work for forming the perforation hole, the grout reinjection work, etc. must be performed step by step by separate devices There was a hassle.

Korean Published Patent Application No. 2012-0092357 (Aug. 21, 2012)

It is therefore an object of the present invention to provide a method of reinforcing a ground by fast and stable fastening to a perforation hole formed on a slope, The present invention provides a wing top earth anchor device for reinforcing a slope so that the slope reinforcement can be carried out all at once until reinjection.

According to an aspect of the present invention, there is provided an earth anchor apparatus including an insertion hole formed at a center thereof in a lengthwise direction, and having an inclined surface extending from one point of the insertion hole toward a rear side thereof An anchor main body; A center bar mounted through the insertion hole of the anchor main body; A wing member rotatably hinged to the anchor main body so as to be extended outwardly and restraining the anchor main body from being retracted while being stretched over the inner wall of the perforation hole when the main body is unfolded; A ball holder having a plurality of through holes arranged in an inclined surface of the insertion hole of the anchor main body and arranged along the circumferential direction; and an anchor main body positioned in a through hole of the ball holder and advancing together with the ball holder, A plurality of wedge balls for performing a wedge action for restricting the center bar with respect to the anchor main body in contact with the inclined surface of the anchor body and the outer peripheral surface of the center bar passing through the anchor main body and releasing the restraint of the center bar when the ball holder is retracted, And a spring that is provided on the rear side of the ball holder and tends to prevent the ball holder from retracting due to an elastic force and which allows the ball holder to retract if a force exceeding a predetermined level is applied, A restricting member for allowing the restricting member; And a guide pipe coupled to a rear end of the anchor main body and guiding the center bar through the guide pipe.

The wing member includes a wing portion having one end hinged to the anchor main body and normally in close contact with the outer peripheral surface of the anchor main body and having the other end extending on the inner wall of the perforation hole when the wing member rotates about the hinge shaft, And a locking protrusion extending perpendicularly from one end of the wing portion and protruding into the insertion hole after passing through the wall of the anchor main body, Wherein when the center rod is retracted in a state where the center rod is mounted on the insertion hole of the anchor main body, the latching projection portion of the wing member is pushed out of the lead groove and is rotationally displaced so that the wing portion is rotated and unfolded .

The center bar may be mounted on the anchor main body such that its tip end protrudes forward of the anchor main body, and a drill bit is mounted on the protruding end of the center bar.

The excavation bit is for forming a multi-stage perforation hole by expanding the diameter inside the drilled hole. The excavation bit is coupled to the distal end of the center rod to rotate by receiving driving force from the drill machine through the center rod, A bit body having a pair of inclined surfaces inclined to the side of the body and having guide grooves formed on the inclined surfaces; And a pair of bit blades which are slidably engaged with the guide grooves of the bit body so as to advance and retract when the bit bodies are retracted.

In addition, a pair of magnets may be further provided on the front end face of the anchor main body and the rear end face of the excavating bit so as to correspond to each other so that the center bar can continuously maintain the retracted state such that the wing member is unfolded .

In addition, the anchor main body and the guide pipe may be formed with a first injection hole and a second injection hole for injecting grout material into the perforation hole, the center rod being provided with a hollow tube, And an opening communicating with the second injection hole of the guide pipe is formed so that the grout material can be injected into the perforation hole through the center rod.

In addition, a plating layer of Ni-SiC having a thickness of 1.0 mm or less is formed on the outer circumferential surface of the center bar so as to reduce friction caused by surface contact, and the plating layer has a diameter within a range of 50 to 250 탆, A plurality of minute dimples spaced apart from one another at intervals are formed on the surface of the solid lubricant particles, spherical solid lubricant particles having bearing characteristics are accommodated in the dimples so as to be rotatable, and the surface of the solid lubricant particles contains a liquid lubricant, A plurality of fine oil pockets may be formed, and the material may be formed of a material that generates fine particles to lubricate away from the surface due to frictional contact with the object.

Meanwhile, the slope reinforcement method according to the present invention includes: drilling a perforation hole in a slope ground; And pressing and filling the grout material with the earth anchor device inserted into the perforation hole.

The wing top earth anchor device and the slope reinforcement method using the wing top earth anchor device according to the present invention allow the operator to unfold a wing member at an appropriate time point, so that the ground can be more quickly and stably fixed to the perforation hole formed on the slope.

In addition, the present invention enables rotation and backward linear movement of the center bar supported by the restraining member, thus enabling various types of application operations.

Further, according to the present invention, it is possible to carry out the whole process from puncturing to grout reinjection if necessary, thereby shortening the air and reducing the cost for equipment.

1 is a perspective view of an earth anchor apparatus according to an embodiment of the present invention.
2 is a sectional view for explaining a configuration of an earth anchor apparatus according to an embodiment of the present invention
3 is a partially exploded perspective view for explaining a configuration of a restraining member in an earth anchor apparatus according to an embodiment of the present invention.
4 and 5 are perspective views for explaining the construction of excavation bits in the earth anchor apparatus according to the embodiment of the present invention.
6 to 8 are a series of reference drawings for explaining various functions of the earth anchor apparatus according to the embodiment of the present invention.
9 is a cross-sectional view for explaining the low friction structure formed on the center bar surface in the earth anchor device according to the embodiment of the present invention and its operation
FIG. 10 is a photograph for explaining a spray drying method among various methods for forming solid lubricant particles, which is one of the elements having a low friction structure on the surface of the center rod in the earth anchor apparatus according to the embodiment of the present invention.
11 is a flowchart of a slope reinforcement method using an earth anchor apparatus according to an embodiment of the present invention.
12A to 12J are a series of reference drawings for explaining a slope reinforcing method using an earth anchor device according to an embodiment of the present invention

A wing top earth anchor device and a slope reinforcement method using the wing top earth anchor device 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.

FIG. 1A is a perspective view of a basic state in which an excavating bit is removed from an earth anchor apparatus according to an embodiment of the present invention, FIG. 1B is an assembled perspective view for adding excavation bits in an earth anchor apparatus according to an embodiment of the present invention, Is a perspective view of a ground anchor apparatus according to an embodiment of the present invention, in which excavation bits are mounted. 3 is a partially exploded perspective view for explaining a configuration of a restraining member in an earth anchor apparatus according to an embodiment of the present invention. FIG. 3 is a partial exploded perspective view of the earth anchor apparatus according to the embodiment of the present invention, And FIGS. 4 and 5 are reference perspective views for explaining the construction of excavation bits in the earth anchor apparatus according to the embodiment of the present invention. 6 to 8 are a series of reference views for explaining various functions of the earth anchor device according to the embodiment of the present invention.

The earth anchor device according to an embodiment of the present invention basically includes an anchor main body 110, a center bar 120, a wing member 130, a restricting member 140, a guide pipe 150, In addition, the excavation bit 160 can be selectively mounted on the shank 120a formed at the distal end of the center bar 120. In addition,

The earth anchor device according to the embodiment of the present invention is configured such that the restraint member 140 is provided to restrain forward movement of the center bar 120 but allow it to retract and rotate, As shown in FIG. 7, when the wing member 130 is unfolded, the drilling operation using the drilling bit 160 and the drilling operation using the drilling hole 160, as shown in FIG. 8, can be performed quickly and stably It is possible to carry out the grout reinjection work for filling.

Hereinafter, the earth anchor device will be described in detail in the embodiment of the present invention.

The anchor main body 110 has an insertion hole 111 formed at the center in the longitudinal direction and has an inclined surface 111a extending from one point of the insertion hole 111 toward the rear side. The center bar 120 is inserted into the insertion hole 111 of the anchor main body 110 and a restraining member 140 is installed on the inclined surface 111a where the diameter of the center bar 120 begins to expand to restrain the center bar 120 .

A plurality of seating grooves 112 are formed on the outer circumferential surface of the anchor main body 110 to receive the wing portions 131a of the wing members 130 to be seated thereon. 131b are inserted into the inner insertion holes 111 and protrude therefrom. A plurality of first injection holes 114 are formed in the anchor main body 110 so that the grout material fed through the center rod 120 or the guide pipe 150 can reach the insertion hole 111 and be ejected to the outside .

In addition, a pair of magnets 115 are provided which are connected to each other in a corresponding manner on the front end surface of the anchor main body 110 and the rear end surface of the excavation bit 160. As a result, as shown in FIG. 6, the wing member 130 can be more stably held.

The center bar 120 is installed through the insertion hole 111 of the anchor main body 110 and is restrained by the restraint member 140 to be prevented from advancing relative to the anchor main body 110, The rotation becomes possible. The center bar 120 has an inlet groove 121 through which the latching protrusion 131b of the wing member 130 is inserted while being inserted through the insertion hole 111 of the anchor main body 110. As a result, when the center rod 120 is retracted from the initial state of being mounted to the insertion hole 111 of the anchor main body 110, the locking protrusion 131b of the wing member 130 is naturally pushed out of the inlet groove 121, The wing portion 131a also rotates and unfolds.

In addition, the center bar 120 has a chuck (not shown) for selectively mounting the excavation bit 160 at the tip thereof. The center bar 120 is formed of a hollow tube from the rear side thereof to avoid the portion where the grouting material 121 is formed so that the grouting material can be transported. The center bar 120 is inserted into the anchor main body 110 and the guide pipe 150 The grout material reaches the first injection hole 114 of the anchor main body 110 and the second injection hole 154 of the guide pipe 150 so that the grout material can be injected to the outside, An opening 124 communicating with the second injection hole 154 of the guide pipe 150 is formed.

Since the center bar 120 can be retracted and rotated even if the forward movement of the center bar 120 is inhibited by the restricting member 140, the anchor body 110 can be inserted into the insertion hole 111 from front to back The anchor main body 110 can be moved into the perforation hole formed in the ground by pushing the center rod 120 and the guide pipe 150 forward. When the anchor main body 110 is determined to be inserted deeply into the perforation hole, the wing member 130 may be unfolded so as to extend over the inner wall of the perforation hole by simply pulling the center bar 120 rearward with respect to the guide pipe 150. Further, since the center bar 120 is allowed to rotate by the restraining member 140, the excavation bit 160 is mounted on the chuck formed at the distal end of the center bar 120 to perform the perforation operation itself without a separate hammer bit or a perforated bit It is also possible to perform.

The wing members 130 are rotatably hinged to the anchor main body 110 so as to be spread out to the left and right. When the wing member 130 is in the unfolded state, its end is fixed on the inner wall of the perforation hole. Then, the anchor main body 110 is also fixed inside the perforation hole, so that the anchor main body 110 is not separated from the perforation hole. The wing member 130 includes a wing portion 131a and a locking protrusion 131b. One end of the wing portion 131a is hinged to the anchor main body 110 and is normally hinged to the outer peripheral surface of the anchor main body 110 And is rotated and rotated around the hinge shaft 132. [0064] At this time, when the other end of the wing portion 131a is stretched over the inner wall of the perforation hole, and then the tensile force is pulled backward, the anchor main body 110 is firmly fixed while being further inserted into the inner wall of the perforation hole. The locking projection 131b extends integrally from one end of the wing portion 131a and protrudes into the insertion hole 111 through the insertion hole 113 formed in the wall of the anchor main body 110 .

6, when the center bar 120 is retracted in a state of being mounted on the insertion hole 111 of the anchor body 110, the engagement protrusion 130b of the wing member 130 Is pushed from the inlet groove 121 and is rotationally displaced, the wing portion 131a is rotated and unfolded. The wing member 130 can be unfolded at an appropriate point in time, which is different from the conventional wing blade which has a tendency to be unfolded while being elastically supported by a spring. In addition, since the wing member 130 can be folded when the ground anchor device is inserted into the perforation hole, the entire device can be pulled out at any time, so that position adjustment or removal operation becomes possible.

The restricting member 140 plays a very important role in allowing the retention of the center bar 120 while preventing the center bar 120 from advancing with respect to the anchor main body 110, and further supporting the rotation as much as possible. To this end, the restraint member 140 includes a ball holder 141, a plurality of wedge balls 142, and a ring-shaped leaf spring 143. The ball holder 141 in the restraining member 140 has a plurality of through holes 141b disposed in the circumferential direction on the inclined surface 111a of the insertion hole 111 of the anchor body 110. [ The wedge ball 142 is positioned on the through hole 141b of the ball holder 141 and moves along the inclined surface 111a of the anchor main body 110 while advancing together with the ball holder 141. [ And an outer circumferential surface of the center bar 120 to perform a wedge action for restraining the center bar 120 with respect to the anchor body 110. On the other hand, when the ball holder 141 is retracted, the restraint of the center bar 120 is released. The plate spring 143 is disposed on the rear side of the ball holder 141 and tends to prevent the ball holder 141 from retracting due to an elastic force. When a force exceeding a predetermined level is applied, Allow retreat. When the ball holder 141 is retracted, the gap between the inclined surface of the anchor main body 110 and the center bar 120 is widened around the wedge ball 142, and the wedge ball 142, The retraction of the center bar 120 becomes possible.

The guide pipe 150 is engaged with the rear end of the anchor main body 110 to guide the center bar 120 in a penetrating manner and pulls the anchor main body 110 inserted into the perforation hole of the ground backward It is used to apply tensile force. 2, the rear end of the guide pipe 150 is shorter than the center bar 120 by a length L1. This is because the rear end of the center bar 120 is protruded to the rear of the guide pipe 150 so as to be connected to a drill machine or the like, or only the center bar 120 can be pulled easily. A second spray hole 154 for injecting the grout material into the perforation hole is formed at the tip of the guide pipe 150.

The excavation bit 160 comprises a bit body 161 and a pair of bit blades 163. The bit body 161 includes a pair of inclined surfaces 162a that are coupled to a chuck formed at the tip of the center bar 120 to rotate to receive a driving force from the drilling machine, And a guide groove 162b formed in the guide groove 162b. The pair of bit blades 163 are coupled to the guide groove 162b of the bit body 161 so as to be slidable and retractable. The pair of bit blades 163 are gathered at the center at the time of advancement, Lt; RTI ID = 0.0 > 161). ≪ / RTI > However, the retraction and widening of the bit blade 163 are made naturally when the bit blade 163 is pressed from the front side. A plurality of hemispherical protrusions 163a are provided at the tip of the bit blade 163 to facilitate excavation of the ground.

According to the structure of the excavation bit 160 described above, the drilling bit 160 may be inserted into the drilling hole in the state where the drilling hole is already formed, and the secondary drilling may be started so as to have a larger inner diameter, Hole 160 may be used to form the perforation hole. At this time, the bit blade 163 is pressed against the inner end surface of the perforation hole and is retracted to be opened to the left and right, so that it is possible to naturally form the perforation hole having a wider inner diameter.

Whether or not to attach the excavation bit 160 to the center bar 120 can be freely selected in consideration of the work environment. When the excavation bit 160 is mounted on the chuck located at the distal end of the center bar 120, the excavation bit 160 is advantageously excavated or drilled by the earth anchor device alone without the aid of other excavation equipment, It is possible to remove only the center bar 120 after fixing the anchor body 110 to the perforation hole. However, it is needless to say that a bit or a tool capable of functioning in addition to the excavation bit 160 shown in the figure may be selectively mounted on the distal end of the center bar 120.

In order to reduce the friction between the anchor main body 110 and the guide pipe 150 with respect to the center bar 120 in the earth anchor device according to the embodiment of the present invention, A fine low friction configuration is additionally applied and will be described below.

FIG. 9 is a cross-sectional view for explaining a low friction structure formed on the center bar surface in the earth anchor device according to the embodiment of the present invention and its operation, and FIG. 10 is a cross- FIG. 3 is a photograph for explaining a spray drying method among various methods for forming solid lubricant particles, which is one of the constituent elements of the structure.

As shown in the figure, in the earth anchor device according to the embodiment of the present invention, the low friction member is fixed to the center bar 120 in order to reduce the friction between the anchor main body 110, the constraining member 140, 120) having a plurality of dimples 125a formed on the surface of the dimples 125a, and a solid lubricant particle 126 having a bearing characteristic by allowing the dimples 125a to be rotated in a state of being accommodated in the dimples 125a .

Such an arrangement is advantageous in that the relationship of the center bar 120, which is in friction contact with the surfaces while linearly and rotationally moving with respect to the anchor main body 110 and the guide pipe 150, is constantly reciprocating and rotating relative to the cylinder in the automobile engine (Refer to Korean Patent Registration No. 1507012 (Feb. 23, 2015)) using a dimple applied to an automobile engine in consideration of the similarity with the piston frictioned on the surface. However, the present invention is not limited to this, but the present invention is further developed to add a unique configuration that imparts bearing characteristics by adding solid lubricant particles 126 to the dimples 125a.

According to this configuration, when the surface of the anchor main body 110, the restricting member 140, and the guide pipe 150 is brought into contact with each other due to the movement of the center bar 120, a low friction effect caused by the plurality of dimples 125a, The low friction effect of the solid lubricant particles 126 exhibiting the characteristics exhibits an excellent low friction effect.

A plating layer 125 of Ni-SiC is first formed on the surface of the center bar 120 and then a dimple 125a is formed on the plating layer 125 to provide a low friction effect of the solid lubricant particles 126, So that a high low friction effect can be expected.

According to the configuration in which the spherical solid lubricant particles 126 are accommodated in the dimple 125a, due to the movement of the center bar 120 as shown in FIG. 9, the anchor body 110, the restraint member 140, Abrasion and friction of the plating layer 125 can be minimized by the rolling action of the solid lubricant particles 126 and the minimization of the contact area in an environment in which the contacted member such as the contact member 150 strongly contacts with the sliding friction. Further, depending on the material constituting the solid lubricant particles 126, the debris particles generated by the progressive wear of the solid lubricant particles 126 in the sliding friction contact environment may be mixed with the liquid lubricant to perform additional lubrication .

The solid lubricant particles 126 may be manufactured in accordance with an environment in which the earth anchor device is used, or may be prepared by purchasing the solid lubricant particles 126. For example, the IF-WS ₂ synthesized by the Weisman Institute in the early 1990s began commercial production in 2002, unlike the platelet-shaped MOS ₂ , which has a spherical shape with a diameter of about 3 to 350 nm. In the case of IF-WS ₂ , it is considered that the IF-WS ₂ can be provided in a micrometer unit suitable for accommodating inside the dimple. In general, it is known that rolling friction occurs between rough surfaces of metal, It is expected that rolling friction can be performed.

For reference, the spherical solid lubricant particles 126 may be prepared in various manners only by the present technology. In order to prepare spherical particles, a spray drying method is used. A molding method, a method of forming a sphere by using a surface tension while flowing a molten slurry or a slurry on a surface having nano protrusions, a method using a surface tension provided through a cooling step and a subsequent step of a drying step, a method using a Lotus effect, And molding methods using 3D printers.

Also, on the surface of the solid lubricant particles 126, a plurality of fine oil pockets 126a for receiving a liquid lubricant, such as the surface of a golf ball, are formed. It is possible to form the fine oil pockets 126a on the surface of the solid lubricant particles 126 in a variety of ways. Among them, in the case of the spray drying method and the powder molding method, fine powder particles smaller than the above- The particles are agglomerated on the surface of the spherical particles and then heat-treated. As a result, fine oil pockets are naturally formed between the agglomerated fine powder particles as shown in FIG. In addition, laser processing to form fine oil pockets by irradiating laser while rotating spherical particles, micro-discharge machining to form fine oil pockets by pressing spherical particle surfaces using dimple-shaped tools, spherical particles and fine oil pockets And a 3D printing method capable of forming simultaneously can be used.

The slope reinforcing method using the earth anchor device according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the most basic method of the slope reinforcement method using the earth anchor device according to the embodiment of the present invention, the ground anchor device according to the embodiment of the present invention is inserted into the perforated hole And pressurizing and filling the grout material in this state. However, focusing on the multi-purpose function of the earth anchor apparatus according to the embodiment of the present invention, the earth anchor apparatus according to the present invention will be explained focusing on the method of collectively performing perforation and grout reinjection.

FIG. 11 is a flowchart of a slope reinforcement method using an earth anchor apparatus according to an embodiment of the present invention. FIGS. 12A to 12J are a series of reference drawings for explaining a slope reinforcement method using an earth anchor apparatus according to an embodiment of the present invention. to be.

As shown in the figure, the slope reinforcement method according to the embodiment of the present invention includes the steps of perforating the first perforation hole (S101), inserting the ground anchor device (S102), drilling the second perforation hole (S103) The grout refilling step (S105), and the finishing step (S106) are sequentially performed.

First, in the first perforation hole drilling step (S101), the first perforation hole H1 is drilled in the slope ground G as shown in FIG. 12C. For this purpose, a general drill bit or hammer drill is used although not shown. 12A and 12B, the center rod 120 of the earth anchor device is attached to the anchor main body 110 to prepare the earth anchor device 100 for use I'm done. The rear end of the center bar 120 may be inserted through the front end of the insertion hole 111 of the anchor main body 110 and then pushed back. At this time, since the wedge ball 142 of the restraining member 140 allows the backward movement of the center bar 120, the state in which the center bar 120 is mounted on the anchor body 110 is easily performed as shown in FIG.

Then, the earth anchor device inserting step (S102) proceeds. In this step, as shown in FIG. 11D, the earth anchor device is inserted into the first perforation hole H1 until it is fully inserted.

Thereafter, the second perforation hole perforating step (S103) proceeds. In this step, as shown in FIG. 12E, work is carried out by supporting the guide pipe 150 and advancing the anchor main body 110 while rotating the center bar 120 by a drill machine (not shown). When the second perforation is started, the bit blade 163 is pressed on the inner end surface of the first perforation hole H1 and is retracted to be opened to the left and right, thereby naturally puncturing the second perforation hole H2 having a wider inner diameter Start. 12f, the center bar 120 and the guide pipe 150 are deeply inserted into the ground G, the operation of the drill machine is stopped and the drilling operation by the drilling bit 160 is stopped.

Thereafter, the earth anchor device fixing step (S104) proceeds. In this step, as shown in FIG. 12G, the earth anchor device pulls the center rod 120 backward from the guide pipe 150 exposed to the outside in a state where the earth anchor device is deeply inserted into the ground G immediately after the second perforation hole H2 is pierced. Then, the wing member 130 is spread widely to the left and right, and its end is in contact with the inner wall of the second perforation hole H2. However, as shown in FIG. 12H, when the guide pipe 150 is pulled backward, the anchor main body 110 is retracted and the wing member 130 penetrates the wall of the second perforation hole H2 and is stably fixed do.

Thereafter, the grout refilling step (S105) proceeds. In this step, a hole lid CP is installed to connect the injection hose HS to the center rod 120 while closing the inlet of the first perforation hole H1, Of the grout material. The grout material is transported along the center bar 120 and then flows into the anchor main body 110 and the guide pipe 150 through the opening 124 of the center bar 120 so that the first injection hole 114 and the second injection hole 154 and injected into the first through-hole H1 and the second through-hole H2.

Thereafter, the finishing step S106 is performed. In this step, as shown in FIG. 12J, the grout material is cured and the center bar 120 protruded outside the hole cover CP and the guide pipe 150 are sealed with an encapsulating material CM to finish. At this time, if the protruding degree of the center rod 120 and the guide pipe 150 is large, they are cut and sealed.

This completes the slope reinforcement method according to the embodiment of the present invention. According to the slope reinforcement method, the earth anchor device 100 is fixed firmly in the multi-stage perforation hole by the wing member 130, and at the point where it is connected to the second perforation hole H2 from the first perforation hole H1 The passive resistance against the grout material hardened by the step formed by the rapid expansion of the inner diameter is ensured and the reinforcement strength is further increased. Since the drilling bit 160 is used for drilling the second perforation hole H2 in the first perforation hole H1, the state in which the ground anchor device 100 is inserted in the ground G is maintained as it is And it does not need to use additional equipment.

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: anchor body 120: center rod
130: wing member 140:
150: Guide tube 160: Excavation bit

Claims (8)

An earth anchor device installed in a perforation hole formed in a slope ground to reinforce the ground,
An anchor main body having an insertion hole formed at a center thereof in the longitudinal direction and having a slope extending from one point of the insertion hole to a rear side thereof; A center bar mounted through the insertion hole of the anchor main body; A wing member rotatably hinged to the anchor main body so as to be extended outwardly and restraining the anchor main body from being retracted while being stretched over the inner wall of the perforation hole when the main body is unfolded; A ball holder having a plurality of through holes arranged in an inclined surface of the insertion hole of the anchor main body and arranged along the circumferential direction; and an anchor main body positioned in a through hole of the ball holder and advancing together with the ball holder, A plurality of wedge balls for performing a wedge action for restricting the center bar with respect to the anchor main body in contact with the inclined surface of the anchor body and the outer peripheral surface of the center bar passing through the anchor main body and releasing the restraint of the center bar when the ball holder is retracted, And a spring that is provided on the rear side of the ball holder and tends to prevent the ball holder from retracting due to an elastic force and which allows the ball holder to retract if a force exceeding a predetermined level is applied, A restricting member for allowing the restricting member; And a guide pipe coupled to a rear end of the anchor main body and guiding the center bar through the guide pipe,
The wing member includes a wing portion having one end hinged to the anchor main body and normally in close contact with the outer peripheral surface of the anchor main body and having the other end extending on the inner wall of the perforation hole when the wing member rotates about the hinge axis, And an engagement protruding portion extending perpendicularly from one end of the anchor main body and protruding into the insertion hole after passing through the wall of the anchor main body,
Wherein the center rod has an inlet groove into which the latching protrusion of the wing member is inserted when the center rod is mounted on the anchor main body. When the center rod is retracted while being mounted on the insertion hole of the anchor main body, And the wing portion is rotated and unfolded while being rotated and displaced from the lead-in groove. delete The method according to claim 1,
Wherein the center bar is mounted on the anchor main body such that its tip end protrudes forward of the anchor main body, and an excavating bit is mounted on the protruding tip end of the center bar. The method of claim 3,
The excavation bit is for forming a multi-stage perforation hole by expanding the diameter inside the perforated hole. The drilling bit is coupled to the distal end of the center rod to rotate by receiving driving force from the drill machine through the center bar. A bit body having a pair of inclined surfaces inclined and guide grooves formed on the inclined surfaces; And a pair of bit blades which are engaged with the guide grooves of the bit body so as to be slidable and retractable and which are gathered at a center and retracted when the bit bodies are retracted. The method of claim 3,
Further comprising a pair of magnets coupled to the front end surface of the anchor main body and the rear end surface of the excavating bit so as to be able to continuously maintain the retracted state of the center bar so as to unfold the wing member. Device. The method of claim 3,
Wherein the anchor body and the guide tube are provided with a first injection hole and a second injection hole for injecting the grout material into the perforation hole, the center rod is provided with a hollow tube, and the body is provided with a first spray hole And an opening communicating with the second injection hole of the guide tube is formed,
And the grout material can be injected into the perforation hole through the center rod. The method according to claim 6,
A plating layer of Ni-SiC having a thickness of 1.0 mm or less is formed on the outer circumferential surface of the center bar so as to reduce friction caused by surface contact, and the plating layer has a diameter within a range of 50 to 250 mu m, A plurality of minute dimples spaced apart from each other are formed, spherical solid lubricant particles having bearing characteristics are accommodated in the dimples so as to be rotatable,
The surface of the solid lubricant particle is formed with a plurality of fine oil pockets for accommodating a liquid lubricant and reducing a friction area, and is formed of a material that generates fine particles to lubricate away from the surface due to frictional contact with the object. And an earth anchor. In a slope reinforcement method for stabilizing a slope slope,
Drilling a perforation hole in the slope ground;
And pressing and filling the grout material with the earth anchor device according to any one of claims 1 to 7 inserted into the perforation hole.

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