KR100797800B1 - Fixing device of permanent anchor - Google Patents

Abstract

An end anchorage of a permanent anchor is provided to reduce a period of construction by fixing anchor blades and pulling out a strand simultaneously, and to increase construction quality and safety by preventing the deformation by earth pressure and having excellent resistance to tensile stress, shear stress and bending moment. An end anchorage of a permanent anchor includes a strand(L) formed by twisting many wires spirally and inserted to an anchor hole, and an end anchorage(100) coupled to one end of the strand and inserted to the anchor hole together with the strand. The end anchorage includes an air hose(110) extended to the inside of the anchor hole and connected to the end anchorage to let the outside compressed air in, many anchor blades(120) provided with a coupling hole at one side to be moved and extended to the outside ground on the axial line of the anchor hole and formed at an acute angle at the other side to be anchored to the ground at expansion, an anchor head(130) coupled with the anchor blades at the circumference, attached with the anchor blades moved and expanded to the ground by high pressure compressed air flew in from the air hose and provided with many anchor blade joints(132) having hinge holes(133) to couple the anchor blades, a compressed air inflow hole formed on one side of a strand joint and connected with the air hose to let the outside compressed air in and many compressed air injection holes connected to the compressed air inflow hole to inject compressed air into the anchor blade joints to make the anchor blades expanded to the ground of the anchor hole, and a strand joint(140) unified with the anchor head and provided with a ÝÀ-shaped fitting hole to fix an end of the strand in a ÝÀ-shape.

Description

Fixing device of permanent anchor}

1 is a state diagram of a conventional permanent anchor installation.

Figure 2 is a state diagram of the installation of the front end of the permanent anchor according to the present invention.

3 is an overall perspective view of the tip anchoring hole of the permanent anchor according to the present invention.

Figure 4 is an exploded perspective view of the tip anchoring hole of the permanent anchor according to the present invention.

5 is a partially cutaway perspective view of the tip anchoring hole of the permanent anchor according to the present invention.

Figure 6 is a cross-sectional view before anchor hole anchoring the tip anchorage of the permanent anchor according to the present invention.

7 is a cross-sectional view after fixing the anchor hole of the tip anchoring hole of the permanent anchor according to the present invention.

* Description of the major symbols in the drawings *

A: anchor ball L: stranded wire

100: front end stop 110: air hose

120: fixing blade 122: coupling hole

130: fixing head portion 131: hinge shaft

132: fixing blade coupling unit 133: hinge hole

134: compressed air inlet hole 136: compressed air injection hole

140: strand wire coupling portion 142: "U" type fitting hole

The present invention relates to a tip anchorage of the permanent anchor, and more particularly, the strand is coupled to the "U" shape of the "U" shaped twisted pair coupling portion of the tip anchorage is installed by a plurality of fixing wings hingedly coupled to the strand After inserting the tip fixing hole into the anchor hole of the slope, a plurality of fixing wings hinged to the tip fixing hole are rotated and fixed with respect to the hinge axis to the anchor hole wall by the high pressure compressed air introduced from the outside, The anchoring force is not made by the grout, but by the fixing head which is wedge-shaped so that the tip of the anchor is press-fixed to the ground, so that the anchor can be immediately tensioned regardless of the state of the ground. It is configured not to be separated from the anchor ball, and then the strand is located in the center of the axis of the anchor ball so that the tip of the anchor ball Chakgu will cure by injecting a grouting material into the insert inside of the more robust the tensile stress and the end anchorage of the permanent anchor to resist the shear stress and bending moment in the ground to prevent the fall of the ground.

In general, permanent anchors are used for earthquake construction to prevent the collapse of cut surfaces in rocks, ground cutouts, slope stability, landslide restraint, groundwater prevention of large structures such as buildings or dams, prevention of injury of underground structures, large buildings Used to prevent the collapse of excavated walls in underground construction of civil engineering. In addition, the construction of earthquakes, large steel towers, retaining walls, etc. prevents the movement and distortion of the construction, prevents fall, constructs for the reaction of cantilevers, and assists in indentation of caissons for underwater construction. It is installed to do such things.

In this permanent anchor method, as shown in Figure 1, generally drills the anchor hole (A) using a perforator, such as rock, ground, etc., which may be collapsed, the grout hose and a plurality of strands through the anchor hole (A) (L) and the fixing head part 10 are provided as one unit and inserted. Next, grout is injected through the grout hose inserted into the anchor hole A, and when the injected grout is cured together with the fixing head 10 after a certain time, the other end of the strand L is cured. After installing the acupressure means and fastening the anchorage, the general construction method is to stabilize the target structure by tensioning the strand L in the strand using separate hydraulic equipment or the like.

This conventional permanent anchor is to support the tensile force from the surface by the ground pressure of the grouting or the frictional force with the ground. In the permanent anchor method, the anchor component includes an anchor body fixing part having a function of transferring a tensile force to the ground by exerting a required stress, and a free tensile part and a required stress structure that transmits the tensile force due to the stress exerted on the anchor head. It consists of an anchor head with a role to act on. Here, the anchor fixing part is determined by the adhesion resistance of the ground and grout, the grout and the tension member.

Such a permanent anchor provides a rigidity to the pull due to the ground pressure of the grout, and there are many joints around the anchor hole in which the anchor is inserted according to the ground state of the soft ground, slope, rock, and the like. . Jointing in these perforated anchor holes is quite difficult to identify from the outside. That is, when the grout is injected by inserting the tension member into the anchor hole, the grout is filled in the anchor hole by the injection pressure. Therefore, when the grout is injected into the anchor hole, the grout leaks from the anchor hole toward the plurality of joints formed therein, thereby lowering the grout filling rate inside the anchor hole.

In this way, the filling rate of the grout is significantly lowered due to a large number of joints in the anchor hole, thereby failing to substantially reinforce the ground. In addition, even if the joint generated in the anchor hole is formed only in a part, since the entire area inside the anchor hole is one space, voids are generated in the grout filled in the entire area of the anchor hole, thereby preventing substantial reinforcement.

Therefore, it is quite difficult to measure the strength of the grout filled in the anchor hole, and the work time is also considerably increased, resulting in an increase in additional costs such as construction costs due to the expansion of air. In addition, the grout filled in the anchor hole does not check the presence of voids in the grout due to jointing, and thus performs anchor construction such as soft ground and slope reinforcement. There is a problem that a large accident can occur.

In addition, the conventional permanent anchor is inconvenient to select the anchor according to each soil condition and the load is applied intensively at the anchorage of the tip of the anchor inserted into the anchor hole, structurally unstable problems are generated to drill the anchor hole deep As the length of the fixing unit inserted into the anchor hole is increased, the work time of the anchor hole for forming the depth is increased and the length of the fixing unit is increased, resulting in an increase in installation cost.

As described above, cement milk grouting, resin, and tip anchoring anchors are used in order to allow anchorage bodies of anchors, that is, anchorages, to be anchored in the ground in anchor holes as a preliminary work for permanent anchor tensioning. However, conventional grouting and resin have a problem that curing time is required for a certain time, so that when the ground deformation inside the anchor hole is in progress or water is not properly tensioned. In addition, in the case of the existing tip anchoring anchor, if the tension is immediately performed without grouting, there is a problem of deviating from the anchor hole during tension due to the small stress of the anchorage of the anchoring portion fixed to the acupressure.

Therefore, the present invention was created to solve the problems described above, anchors perforated in the ground irrespective of the state of the ground, such as the ground in which the ground is unstable and the tension is required immediately upon drilling and the ground where water is discharged A series of tip anchorages with multiple anchoring wings, which are expanded by high pressure compressed air into the ball, are inserted with the strand and immediately tensioned before the grouting pour, so that the strand is positioned at the center of the anchor hole axis to inject and harden the grouting. The construction time is shortened, which makes it possible to significantly reduce deformation due to earth pressure, and to provide high quality construction that can withstand more firm tensile stress, shear stress and bending moment, and anchor construction requiring high safety. The purpose is to provide a tip anchorage for a permanent anchor.

In addition, the present invention is a permanent anchor that is hardened by the grouting material in the center portion of the anchor hole by the end anchoring hole of the permanent anchor coupled to the end of the strand strand is prevented corrosion of the strand strand is excellent construction quality excellent maintenance cost is reduced maintenance cost Another purpose is to provide a tip anchorage.

End anchoring hole of the permanent anchor of the present invention for achieving the object as described above is a twisted wire (L) is inserted into the anchor hole (A) and the stranded wire (L) as a conventional twisted wire formed of a plurality of iron wire twisted spirally In the end anchoring hole of the permanent anchor including a front end anchoring hole 100 which is coupled to one end of the side and inserted into the anchor hole (A) with the strand (L), the front anchoring hole 100 is compressed air from the outside An air hose 110 extending into the anchor hole A so as to be introduced and connected to the tip fixing hole 100; A plurality of anchoring blades 120 having a coupling hole 122 formed at one side thereof so as to be rotated and expanded toward the outer ground side on the anchor hole A, and having an acute angle at the other side so as to be fixed to the ground side when expanding; Fixing head portion 130 in which the plurality of fixing blades 120 is hinged around the outer edge to one side, the fixing blade 120 is rotated to the ground side by the high-pressure compressed air flowing from the air hose 110 is fixed )Wow; The other side is formed integrally with the fixing head 130, the strand wire coupling portion 140 is formed with a "U" -shaped fitting hole 142, the strand (L) is fitted in the "U" type; includes.

Here, the fixing head portion 130 is formed a plurality around the outer periphery, a plurality of fixing blade coupling portion 132 each formed with a hinge hole 133, the plurality of fixing wings 120 hinged; Compressed air inlet hole (134) formed in communication with the air hose 110 on one side of the strand wire coupling portion 140 side so that compressed air is supplied from the outside; A plurality of compressed air injection holes 136 communicated with the compressed air inlet hole 134 so as to inject compressed air into the fixing wing coupling unit 132 so that the fixing wing 120 is extended to the ground side of the anchor hole A. ) Is formed.

With reference to the accompanying drawings, an embodiment of the tip anchorage of the permanent anchor according to the present invention as described above will be described in detail.

1 is an installation state diagram of the front end anchoring hole of the permanent anchor according to the present invention, Figure 2 is an overall perspective view of the front end anchoring hole of the permanent anchor according to the present invention, Figure 3 is an exploded perspective view of the front end anchoring hole of the permanent anchor according to the present invention 4 is a partially cutaway perspective view of the tip anchorage of the permanent anchor according to the present invention, Figure 5 is a cross-sectional view before anchor anchor of the tip anchorage of the permanent anchor according to the present invention, Figure 6 is a front end of the permanent anchor according to the present invention Sectional view after anchor hole anchorage in anchorage.

As shown in Figure 1, the front end anchoring hole 100 of the permanent anchor of the present invention is formed anchor hole (A) perforated using a punching machine (not shown) in the ground is formed when the conventional ground reinforcement, anchor hole An acupressure means (not shown) is provided to support the tensile stress on the outer ground, one or more tension members connected to the acupressure means are inserted into the anchor hole, and extend from the outside of the anchor hole to the inner end portion to grout. The grouting hose (not shown) formed to be filled is inserted into the anchor hole together with the tension member, and is firmly fixed with wedges and washers (not shown) so that one end of the tension member is connected and fixed to be inserted into the anchor hole. The fixing blade is extended to the ground side to be fixed to the tip, and is composed of a tip anchoring hole 100 or the like provided with tensile resistance. Here, the permanent anchor construction method described above in order to clarify the gist of the present invention for a conventional permanent anchor construction method in which the tip anchoring hole 100 is fitted to the distal end of the strand (L) is inserted into the anchor hole (A). By the detailed description is replaced by a detailed description will be omitted.

On the other hand, the tip anchoring hole 100 of the permanent anchor of the present invention coupled to the distal end of the strand (L), as shown in Figures 2 to 4, the air hose 110, the fixing blade 120, the fixing head portion ( 130, the strand wire coupling unit 140, and the like.

Here, the air hose 110 is from the outside of the ground of the anchor hole (A) toward the fixing head portion 130 is inserted into the ground of the anchor hole (A) to be described later by a compressed air generating device such as a compressor (not shown). It is formed to have a certain length so as to be supplied.

The fixing blade 120 is hinged to the fixing head portion 130 to be described later is formed with a coupling hole 122 on one side to be rotated and expanded to the ground side of the ground on the anchor hole (A) axis. And, the other side is preferably formed to form an acute angle so as to be easily fixed to the ground when expanded to the ground side of the ground.

The fixing head 130 is formed in a cylindrical shape, a plurality of fixing blade coupling portion 132 is formed along the outer edge. Here, the plurality of fixing blade coupling portion 132 is formed in the inner periphery of the outer periphery, the hinge hole 133 corresponding to the coupling hole 122 of the above-described fixing blade 120 is formed on the hinge shaft 131 Hinged together. The hinge hole 133 penetrates from the outer edge of the fixing head 130 to the fixing wing coupling unit 132. In addition, the fixing wing coupling portion 132 has a shape of the fixing blade coupling portion 132 such that the fixing blade 120 is hinged to be positioned on the same plane as the outer edge of the fixing head portion 130 before expanding to the ground side of the ground. It is preferably formed to correspond to the shape of the fixing blade 120.

On the other hand, the compressed air inlet hole 134 so that the compressed air generated from the outside on one side of the strand coupler 140 formed integrally with the fixing head unit 130 flows into the fixing head unit 130 side through the air hose 110. ) Is formed. Here, the compressed air inlet hole 134 is coupled to the front end of the air hose 110 is inserted into the anchor hole (A).

Then, the compressed air injection holes 136 are provided to the inside of the fixing wing coupling portion 132, respectively. The compressed air injection hole 136 communicates with the above-described compressed air inlet hole 134 so that the compressed air introduced from the air hose 110 is hinged to the fixing wing coupling unit 132 side. Anchor hole (A) is provided so as to spray compressed air at a high pressure to extend to the ground side of the ground. That is, the fixing blade 120 is hinged to the fixing blade coupling portion 132 by the compressed air injected through the compressed air injection hole 136 and seated on the same plane as the outer edge of the fixing head portion 130 is the fixing head It is formed to rotate by a high instantaneous pressure so as to extend to the ground side of the ground of the anchor hole (A) outside the outer edge of the portion 130.

The strand wire coupling portion 140 is integrally formed on the other side of the fixing head 130 described above. Here, the strand wire coupling portion 140 is provided in a cylindrical shape formed with a fitting hole 142 of the "U" type. And, the end portion of the strand (L) is fitted into the "U" type fitting hole 142 of the "U" type.

The operation and effects of the tip anchoring aperture of the permanent anchor of the present invention according to the configuration as described above will be described in detail through the embodiment.

As described above, the strand L is coupled to the strand coupler 140 of the tip anchoring hole 100. Here, the strand (L) is coupled to the front end portion is fitted in the "U" type in the fitting hole 142 of the "U" type of the strand wire coupling portion 140 is coupled.

Thus, the tip anchoring hole 100 coupled to the strand (L) is inserted into the anchor hole (A), as shown in FIG. Next, as shown in FIG. 6, the stranded wire L to which the tip anchoring hole 100 is coupled, the compressed air inlet hole of the fixing head unit 130 through the air hose 110 extending from the outside (L). 134).

The compressed air introduced from the outside through the compressed air inlet hole 134 through the air hose 110 is high through each of the compressed air injection holes 136 communicated to the inside of the fixing wing coupling unit 132. It is discharged under pressure. The compressed air discharged through the compressed air injection hole 136 is pushed to one side of the fixing blade 120 hinged to the fixing blade coupling portion 132 at a high pressure.

Therefore, the compressed air is injected to the fixing blade 120 side through the compressed air injection hole 136 at a high pressure, so that the fixing blade 120 is anchored on the axis of the hinge hole 133 of the fixing blade coupling portion 132. The ball A rotates to the ground side of the ground. The pivoting wing 120 rotated in this way draws the strand L from the outside at the same time the portion formed at the other acute angle of the anchoring blade 120 to the ground side of the ground of the anchor hole (A) is fixed to the ground. As the fixing wing 120 is fixed from the outside as described above, the conventional grouting material is injected when drawing the strand (L), thereby shortening the drawing time after the grouting is cured, and simultaneously inserting the strand (L) into the anchor hole (A). It is possible to draw quickly because it is possible to draw out, and it is possible to construct with high accuracy and quality. In addition, it is possible to have a high construction safety.

On the other hand, as described above, before the injection of the grouting material, the strand L is first drawn out by the nail tip fixing fittings, and then, by injecting and curing the grouting material, the fixing blade 120 extended from the fixing head part 130 is It becomes more firmly settled on the ground of the ground and the strand (L) according to the drawing becomes horizontal on the axis of the anchor hole (A) so that the strand (L) is twisted or deformed, or the bottom surface of the anchor hole (A) by its own weight As a result, problems such as corrosion and breakage, poor construction, etc. are significantly reduced.

In addition, the fixing blades 120 respectively coupled to the plurality of fixing blade coupling portions 132 of the tip fixing hole 100 of the present invention is compressed air so that the fixing blades 120 are extended to the ground side of the ground of the anchor hole A. Above a certain pressure of the high pressure compressed air discharged from the injection hole 136, it is preferable that the fixing blade 120 is hinged from the fixing blade coupling portion 132 to extend to the ground side of the ground of the anchor hole A. Do.

That is, by hinge rotation only at a predetermined pressure or more of the compressed air, the fixing blade 120 does not extend from the plurality of fixing blade coupling portion 132 of the tip fixing hole 100 at the normal atmospheric pressure, It is fitted to the fixing wing coupling portion 132. Therefore, when the tip anchoring hole 100 is inserted into the anchor hole (A) provided with the distal end line (L), the fixing blade 120 is hinged from the fixing blade coupling portion 132 by a simple impact and atmospheric pressure to protrude. Not easily inserted into the anchor hole (A).

On the other hand, in the detailed description of the present invention has been described with respect to specific embodiments, to those skilled in the art that various modifications are possible without departing from the scope of the invention, such modifications are claimed It is within the scope of the description.

According to the present invention, a plurality of fixing blades are expanded by high-pressure compressed air in anchor holes drilled in the ground regardless of the state of the ground such as the ground where the ground is unstable and requires tension immediately upon drilling, and the ground where water is discharged. The tip anchorage formed is inserted with the strand and immediately tensioned before the grouting pour, thereby shortening the series of construction times for the strand to be positioned at the center of the anchor hole axis to inject and harden the grouting, thereby significantly reducing deformation due to earth pressure. In addition, it is possible to construct a high-quality construction that can withstand more robust tensile stress, shear stress and bending moment, anchor construction that requires a high safety.

In addition, the present invention has the advantage that the strand is hardened with the grouting material in the center portion of the anchor hole by the end anchoring hole of the permanent anchor coupled to the distal end of the strand, and the corrosion of the strand is prevented, so the construction quality is excellent and the maintenance cost is reduced. have.

Claims (2)

delete A plurality of iron wires are twisted wire (L) is inserted into the anchor hole (A) as a normal twisted wire formed in a spiral twisted, and the stranded wire (L) inside the anchor hole (A) is coupled to one end of the strand (L) In the tip anchoring hole of the permanent anchor including a tip anchoring hole 100 which is inserted together with the tip anchoring hole, the tip anchoring hole 100 is formed to extend into the anchor hole (A) so that compressed air is introduced from the outside to the tip anchoring hole (100) An air hose 110 to be connected; A plurality of anchoring blades 120 having a coupling hole 122 formed at one side thereof so as to be rotated and expanded toward the outer ground side on the anchor hole A, and having an acute angle at the other side so as to be fixed to the ground side when expanding; Fixing head portion 130 in which the plurality of fixing blades 120 is hinged around the outer edge to one side, the fixing blade 120 is rotated to the ground side by the high-pressure compressed air flowing from the air hose 110 is fixed )Wow; The other side is formed integrally with the fixing head 130, the strand wire coupling portion 140 is formed with a "U" -shaped fitting hole 142, the strand (L) is fitted into the "U" type; The fixing head portion 130 is formed around the outer periphery, a plurality of fixing blade coupling portion 132 each formed with a hinge hole 133, the plurality of fixing wings 120 hinged; Compressed air inlet hole 134 is formed in communication with the air hose 110 on one side of the strand wire coupler 140 side to enter the compressed air supplied from the outside; A plurality of compressed air injection holes 136 communicated with the compressed air inlet hole 134 so as to inject compressed air into the fixing wing coupling unit 132 so that the fixing wing 120 is extended to the ground side of the anchor hole A. Permanent anchoring end of the permanent anchor, characterized in that formed.

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