KR100797818B1 - Fixing device of removal rock-bolt - Google Patents

Abstract

An end anchorage of a permanent anchor is provided to prevent the deformation of the soft ground by earth pressure and to resist tensile stress, shear stress and bending moment by inserting an end anchorage provided with many anchor blades into an anchor hole together with a rock bolt and filling up the anchor hole with a grout material, to reduce the time and cost required for construction and to increase construction quality and safety by inserting a rock bolt to an anchor hole and pulling out a rock bolt from the outside simultaneously, and to reduce the civil appeals caused by a rock bolt by removing a rock bolt supported tightly by a PVC pipe easily. An end anchorage of a removal type rock bolt includes a rock bolt(R) provided with a thread at the outer circumferential surface and inserted to an anchor hole, a PVC pipe(P) coupled to the edge of the rock bolt to be separated from a grout material filled in the anchor hole, and an end anchorage(100) coupled to an end coupled with the rock bolt and the PVC pipe and inserted to the anchor hole together with the rock bolt, wherein 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 outer 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, a rock bolt joint(140) coupled with the end coupled with the rock bolt and the PVC pipe, unified with the anchor head in a cylindrical shape and provided with a female screw at the inner circumference to couple the rock bolt, an O-ring groove(144) at the outer circumference and an O-ring keeping the PVC pipe coupled to the O-ring groove tightly, and an anchor head(130) coupled with the anchor blades at the circumference, attached with the anchor blades moved, expanded and anchored 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 the rock bolt 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.

Description

Fixing device of removal Rock-Bolt}

1 is a conventional rock bolt installation state diagram.

Figure 2 is a state diagram of the installation of the front end of the removable lock bolt according to the invention.

Figure 3 is an overall perspective view of the tip anchoring of the removable rock bolt according to the invention.

Figure 4 is an exploded perspective view of the tip anchoring of the removable rock bolt according to the invention.

Figure 5 is a partially cutaway perspective view of the tip anchoring of the removable rock bolt according to the invention.

Figure 6 is a cross-sectional view before the anchor hole anchoring the front end of the removable lock bolt according to the invention.

Figure 7 is a cross-sectional view after fixing the anchor hole of the front end fixing port of the removable rock bolt according to the present invention.

8 is a cross-sectional view showing a lock bolt removal state of the front end stopper of the removable rock bolt according to the present invention.

* Description of the major symbols in the drawings *

A: Anchor Ball R: Rock Bolt P: PVC Pipe

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: lock bolt coupling portion 142: female thread

144: O-ring groove 148: O-ring

The present invention relates to a tip anchorage of a removable rock bolt, and more particularly, having a plurality of fixing wings extending to the ground at the tip of the rock bolt, which is a reinforcement for stabilizing and reinforcing the soft rock according to the slope and tunnel excavation After the tip anchoring hole is installed and inserted into the anchor hole, a plurality of anchoring wings are expanded and fixed to the ground inside the anchor hole by compressed air flowing from the outside, so that when the grouting material is injected into the anchor hole, the lock bolt is anchored. It is located at the center of the ball axis to improve the shear strength of the original ground, and to integrate the whole soft rock reinforced by the rock bolt as a reinforcement, so that the slope of the soft rock can resist the tensile stress, shear stress and bending moment. Safety is further improved, and after construction, rock bolts can be easily removed from the ground, The present invention relates to a tip anchoring hole of a removable rock bolt that can reduce the occurrence of complaints caused by the rock bolt.

In general, rock bolts are used for excavation support systems required for construction of civil engineering facilities such as reinforcement of natural and man-made slopes adjacent to trenches, muds, railways and roads, underground structures and tunnels, repair of existing retaining walls, and installation of retaining walls. Is used to prevent rock reinforcement and rockfall by fixing rock to soft rock due to blasting during excavation by inserting a bolt into the wall and fastening the nut. These rock bolts are inserted for stabilization of the excavated rock surface to integrate the rock and resist tensile stress, shear stress, and bending moment, and improve the shear resistance of the soft rock. It is mainly used for the purpose of solving problems such as collapse and promoting the stability of work.

Looking at the construction method of the conventional rock bolt as described above, as shown in Figure 1, the anchor hole (1) is formed by drilling from the rock surface to the deep rock mass, and the adhesive inside the anchor hole (1) After (2) is inserted, the lock bolt 3 is fixed. When the fixing is completed, the grouting flow prevention cap (5) is installed at the inlet of the anchor hole (1) to install the grouting flow prevention cap (5) to seal and harden the surroundings by grouting, grouting flow prevention cap (5) installed The grouting is filled into the anchor hole 1 through the injection hose 4. When the grouting filling is completed in this way, the pressure plate 6 is fixed to the outer end of the rock perforation part 1 of the rock bolt 3 using the nut 7. Therefore, the rock bolt 3 to be constructed is to hold the rock exposed on the rock surface to the deep rock by using the tension of the rock bolt fixed to the deep rock to prevent the rock from falling off.

However, the conventional rock bolt is simply inserted in the anchor hole and can not reinforce the slope stably. After grouting is poured into the anchor hole on the upper side of the slope, it is cured for 5 to 7 days and then the rock bolt is inserted into the lower anchor hole. And since the grouting operation is made, there was a problem that the construction period takes a long time.

In addition, the conventional rock bolt as described above is hardened by injecting the grouting material after inserting the rock bolt in the anchor hole formed inclined to the rock reflection surface, the anchor hole is drilled downward slope from the slope to be inserted into the anchor hole The tip of the bolt is not centered on the anchor hole axis by its own load and gravity, but rather touches the lower surface of the axis. As such, when the rock bolt is in contact with the lower end of the anchor hole axis by load and gravity, the rock bolt is not settled at the center of the anchor hole during the curing process of the rock bolt and the grouting material when the grouting material is injected into the anchor hole. Since the contact surface is inclined to the lower surface on the anchor hole axis, there is a problem that the fixing strength with the grouting material injected into the anchor hole and hardened. In addition, the shear strength of the rock slope due to the weakening of the anchoring strength is lowered, so that the crack or collapse of the rock easily occurs, the rebar is corroded, there is an increase in maintenance costs and safety problems.

As described above, the conventional rock bolt is inclined to contact with the lower surface of the anchor hole axis by the load and the gravity of the rock bolt, and the rock bolt is warped and deformed. As a result, the rock bolt is easily transformed into an S, and if it is inevitable to invade the land of another neighbor, it is not easy to remove the rock bolt, and thus, the complaints are frequently generated.

Therefore, the present invention was created to solve the problems described above, and expanded by compressed air at the tip of the removable rock bolt to stabilize the slope of the soft rock so that the soft rock does not collapse during the excavation of various civil works Is provided with a plurality of fixing blades that is formed with a tip fixing hole is inserted into the anchor hole with the lock bolt, by filling the grouting material into the anchor hole, the rock bolt is located in the center of the axis of the anchor hole grouting state The purpose is to provide a tip anchorage of a removable rock bolt that is hardened with ash, thereby significantly reducing deformation due to internal acupressure of the soft glaze, and which is able to resist more firm tensile stress, shear stress and bending moment.

In addition, the present invention is shortened the construction period by the front end fasteners coupled to the end of the rock bolt, thereby reducing the construction cost and more stable by the slope reinforcement of the more stable soft rock and rock bolt at the center of the anchor hole axis Another object of the present invention is to provide a tip anchoring hole for a removable rock bolt that is easily cured with the grouting material and is hardened with the grouting material and invades the site of another person. have.

The front end fitting of the removable rock bolt of the present invention for achieving the above object is a thread formed on the outer periphery of the rock bolt (R) and the anchor hole (A) is inserted into the anchor hole (A) is filled PVC pipe (P) coupled to the outer edge of the rock bolt (R) to be separated from the grouting material; The front end fitting of the removable rock bolt including a front end fixing hole 100 coupled to the front end of the lock bolt (R) and the PVC pipe (P) is coupled with the lock bolt (R) inside the anchor hole (A) In the, the front fixing hole 100 is formed by extending into the anchor hole (A) so that the compressed air from the outside and the air hose 110 is connected to the front 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; A rock bolt coupling portion 140 to which a front end portion coupled to the rock bolt R and the PVC pipe P is coupled to one side; A plurality of fixing blades 120 are hinged around the outer edge to the other side, the fixing head 120 is rotated to the ground side by the high-pressure compressed air flowing from the air hose 110 is fixed to the ground portion 130 It characterized by including).

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 is formed in communication with the air hose 110 on one surface of the lock bolt coupling portion 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. ) Is formed.

In addition, the lock bolt coupling portion 140 is formed integrally with the fixing head portion 130 in a cylindrical shape, the female screw 142 is formed to be screwed to the lock bolt (R) on the inner edge, the outer circumference O-ring groove 144 is formed, the O-ring groove 144 is characterized in that the O-ring 148 is further provided so that the PVC pipe (P) is coupled to maintain the airtight.

With reference to the accompanying drawings an embodiment of the front end of the removable rock bolt according to the present invention as described above will be described in detail.

Figure 2 is a state diagram of the installation of the front end of the removable lock bolt according to the invention, Figure 3 is a perspective view of the front end of the removable lock bolt according to the present invention, Figure 4 is a removable rock bolt according to the present invention 5 is an exploded perspective view of the tip anchoring hole, FIG. 5 is a partially cutaway perspective view of the tip anchoring hole of the removable rock bolt according to the present invention, and FIG. 6 is a cross-sectional view before anchor hole fixing of the tip anchoring hole of the removable rock bolt according to the present invention. 7 is a cross-sectional view after fixing the anchor hole of the front end anchoring of the removable rock bolt according to the present invention, Figure 8 is a cross-sectional view showing a rock bolt removal state of the front end anchoring of the removable rock bolt according to the present invention.

As shown in Figure 2, the tip anchoring opening 100 of the present invention is inserted into the anchor hole (A) perforated by a perforator on the slope of the soft rock or the like. Here, when inserted into the anchor hole (A), the tip fixing hole 100 is bolted to the tip of the lock bolt (R), PVC pipe (P) is coupled to the lock bolt (R) outer edge in a state of airtight In the same manner as the conventional rock bolt insertion method inserted into the anchor hole (A), detailed description is omitted for clarity of the gist of the present invention.

On the other hand, the front end fixing hole 100 of the removable rock bolt of the present invention coupled to the front end of the lock bolt (R) and PVC pipe (P), as shown in Figures 3 to 5, the air hose 110, the fixing Wing 120, the fixing head 130, the lock bolt coupling portion 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 (1) so that the compressed air generated from the outside on one side of the lock bolt coupling unit 140 formed integrally with the fixing head unit 130 flows into the fixing head unit 130 side through the air hose 110 ( 134 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 is in communication with the above-described compressed air inlet hole 134, the compressed air flowing from the air hose 110 hinged to the fixing wing coupling portion 132 side fixing blade 120 The anchor hole (A) is provided so as to spray the 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 lock bolt coupling portion 140 is integrally formed on the other side of the fixing head unit 130 described above. Here, the lock bolt coupling portion 140 is formed in a hollow cylindrical shape is formed with a female screw 142. In addition, an O-ring groove 144 is formed at one side of the cylindrical outer edge in which the hollow is formed. O-ring 148 is seated in the O-ring groove 144, PVC pipe (P) is formed so as to maintain the airtight when the fitting is fitted to the outer edge of the lock bolt coupling portion 140, after construction of the rock bolt, grouting when injecting grouting material The ash is formed so as not to flow into the PVC pipe (P). That is, when the grouting material is introduced into the PVC pipe (P), the rock bolt (R) and the grouting material provided inside the PVC pipe (P) is hardened to remove the lock bolt (R), thereby preventing construction costs and poor construction. The increase in cost can be shown to maintain the airtightness of the PVC pipe (P) and the lock bolt coupling portion 140 by the O-ring 148.

The action and effects of the tip anchorage of the removable rock bolt of the present invention according to the configuration as described above will be described in detail through the embodiment.

As described above, the lock bolt R and the PVC pipe P are coupled to the lock bolt coupling portion 140 of the tip fixing hole 100. Here, the lock bolt (R) is bolted to the front end of the female screw 142 of the lock bolt coupling portion 140, PVC pipe (P) is airtight by the O-ring 148 on the outer edge of the lock bolt coupling portion 140 The tip is coupled while maintaining.

Thus, the tip fixing opening 100 coupled to the front end portion of the rock bolt (R) and the PVC pipe (P), as shown in Figure 6, is inserted into the anchor hole (A) perforated on the slope of the soft rock. Next, as shown in FIG. 7, the lock bolt R to which the tip fixing hole 100 is coupled, the compressed air through the air hose 110 extending from the outside, the compressed air inlet hole of the fixing head unit 130. It flows into the (134) side.

The compressed air introduced from the outside through the compressed air inlet hole 134 through the air hose 110 is discharged at a high pressure through each of the compressed air injection holes 136 communicated to the inside of the fixing wing coupling unit. Will be. 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. It rotates to the ground side of the ground of (A). The fixing blade 120 rotated in this way pulls the lock bolt (R) from the outside at the same time the portion formed at the other acute angle of the fixing blade 120 to the ground side of the ground of the anchor hole (A) at the same time. In this way, the fixing blade 120 is fixed from the outside and at the same time the conventional grouting material is injected at the time of drawing, the grouting time is hardened and the drawing time after the insertion of the lock bolt (R) into the anchor hole (A) is possible. Of course, construction is possible, and construction of accurate and excellent quality is possible. In addition, it is possible to have a high construction safety.

On the other hand, by drawing the lock bolt (R) as described above, the fixing blade 120 extended from the fixing head portion 130 is more firmly fixed to the ground of the ground. Then, when the fixing is completed in the anchor hole (A) of the rock bolt (R), the grouting material is injected and cured to complete the construction. Then, after the construction is completed, when the soft ground is stabilized, the rock bolt (R) screwed to the rock bolt coupling portion 140 of the tip fixing hole 100 by rotating the tip portion protruding from the outside of the rock bolt (R) By turning off, it is possible to easily remove the internal lock bolt (R) in the airtight state by the PVC pipe (P). Therefore, when the lock bolt (R) is invaded to the ground of the adjacent other people is easy to remove the lock bolt it is obvious that the occurrence of civil complaints is 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. .

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 fixing hole 100 is inserted into the anchor hole (A) with the lock bolt (R) provided at the tip, the fixing blade 120 is hinged from the fixing wing coupling portion 132 by a simple impact and atmospheric pressure It is easy to insert into the anchor hole (A) does not protrude.

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.

The present invention is provided with a tip anchoring hole formed with a plurality of fixing wings that are expanded by compressed air at the tip of the removable rock bolt to stabilize the slope of the soft rock so as not to collapse during the excavation of various civil works Inserted together with the lock bolt and filling the grouting material into the anchor hole, the rock bolt is positioned at the central portion of the anchor hole and hardened with the grouting material in a horizontal state, thereby causing the internal pressure of the soft plate Significantly less deformation and the ability to resist more robust tensile, shear and bending moments.

In addition, the present invention is shortened the construction period by the front end fasteners coupled to the end of the rock bolt, thereby reducing the construction cost and more stable by the slope reinforcement of the more stable soft rock and rock bolt at the center of the anchor hole axis When it is hardened with the grouting material in a horizontal state to invade the land of adjacent others, it is easy to remove the lock bolt, which has the advantage of significantly reducing civil complaints.

Claims (3)

delete The thread is formed on the outer periphery of the PVC pipe coupled to the outer edge of the rock bolt (R) to be separated from the rock bolt (R) inserted into the anchor hole (A), and the grouting material filled in the anchor hole (A) ( P); The front end fitting of the removable rock bolt including a front end fixing hole 100 coupled to the front end of the lock bolt (R) and the PVC pipe (P) is coupled with the lock bolt (R) inside the anchor hole (A) In the, the front fixing hole 100 is formed by extending into the anchor hole (A) so that the compressed air from the outside and the air hose 110 is connected to the front 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; A rock bolt coupling portion 140 to which the front end portion to which the rock bolt R and the PVC pipe P are coupled to the other side is coupled; Consists of, 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 surface of the lock bolt coupling portion 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. Front end fitting of the removable rock bolt, characterized in that formed. The method of claim 2, The lock bolt coupling portion 140 Is formed integrally with the fixing head 130 in a cylindrical shape, the female screw 142 is formed to be screwed to the lock bolt (R) on its inner edge, the O-ring groove 144 is formed around the outer edge, The O-ring groove 144, the PVC pipe (P) is coupled to the front end of the removable rock bolt, characterized in that the O-ring 148 is further provided to maintain the airtight.

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