KR20070087945A - Cement mortar type rock bolt - Google Patents

Abstract

A cement mortar type rock bolt assembly is provided to supply filling mortar to a leading end of the rock bolt along a supply hose. A cement mortar type rock bolt assembly comprises a sealing unit(200), which is installed on a rock bolt(100) in order to prevent downflow of an adhesive and has an adhesive injection passage, and a supply hose(400), which includes a flexible hose contracted by external pressure of the adhesive, is connected to the adhesive injection passage of the sealing unit at one end thereof, and extends to a leading end of the rock bolt at the other end thereof. The adhesive is supplied to the leading end of the rock bolt along the supply hose through the adhesive injection passage. The supply hose is connected to a wedge cap(210) at one end thereof.

Description

Adhesive Rock Bolts {CEMENT MORTAR TYPE ROCK BOLT}

1 is a conceptual cross-sectional view of an adhesive rock bolt according to an embodiment of the present invention;

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B of FIG.

4 is a cross-sectional view taken along the line C-C of FIG.

5 is a cross-sectional view taken along the line D-D of FIG. 1;

6 is a perspective view of the expansion cap 220,

7 is a longitudinal sectional perspective view of the expansion cap 220,

8 is a perspective view of the wedge cap 210,

9 is a longitudinal sectional perspective view of the wedge cap 210,

10A and 10B are diagrams for explaining the use flowchart of the embodiment of Fig. 1;

<Description of Symbols for Main Parts of Drawings>

100: Rock Bolt

200: sealing device

210: wedge cap 211: simple fasteners

212 female thread 213: wedge

215: anti-rotation jaw

220: expansion cap 221: sliding part

223: engaging portion 224: taper

225: wedge insertion groove 226: incision groove

227: simple fastening groove 228: air discharge passage

300: supply hose fastening clip 400: supply hose

The present invention relates to an adhesive rock bolt.

In various civil and building works, especially in tunnel construction, many rock bolts are installed to prevent the collapse of the tunnel after the excavation of the tunnel.

Rock bolts are used to prevent rock reinforcement and rockfall by fixing rock to soft rock due to blasting during excavation by drilling a hole in the wall, inserting a bolt in it, and then tightening the nut and tightening the nut firmly. do.

Rock bolts may be divided into wedge-type bolts, telescopic bolts, adhesive bolts according to the shape that is fixed to the rock.

The wedge-shaped bolt is inserted by inserting the wedge lightly for the expansion of the tip of the bolt, and lightly hitting the other end of the bolt with a hammer or the like to enlarge and fix the enlarged portion of the tip.

The telescopic bolt attaches a shell and a cone to which a taper is attached, and rotates the bolt to expand the cell to use the friction force accordingly.

Adhesive bolts, which are the fields of use of the present invention, support the rock by filling the holes and the bolts with an adhesive. As the adhesive, cement mortar or synthetic resin is used.

In the method of constructing the adhesive bolt, a rock bolt is inserted into the rock at a predetermined interval using a drill drill, and mortar is injected into the hole using a mortar charger, and then fixed to the rock using a pressure plate and a nut.

At this time, the mortar flows from the inside of the hole during the mortar injection process of the hole drilled at an angle greater than the horizontal angle, and if the sealing force of the sealing device is weak, the packing density of the mortar falls and the final adhesion strength is lowered. In addition, there was a risk that the rock bolt would fall until the mortar inside the perforation was completely hardened to generate the fixed support force of the rock bolt.

In order to solve this problem, Korean Patent Utility Model No. 20-0136682 "Rock Bolt Mortar Cap", Korean Patent Registration No. 10-0383453 "Lock Bolt Construction Fixture", etc. are disclosed as a conventional technology integrated in the present specification. It is.

Such conventional technologies, in particular, Korean Utility Model Model No. 20-0136682, "mortar cap for rock bolt" has the following problems.

(1) Due to the nature of rock drilling, the hole diameter is not constant, so that the fixed mortar cap should be additionally installed when the hole diameter is large, and workability is poor because the hole diameter is small.

(2) Although the length of the mortar injection pipe is short, the air discharge hose is installed to remove the internal air by filling from the bottom when the mortar is injected, but the air is caused by the pressure of the mortar generated by the filling of the mortar from the bottom to the top. The exhaust hose may be blocked and the air inside may not be discharged. Therefore, bubbles may be generated when the construction is completed by the remaining air, and the adhesion between the rock bolt and the rock may cause a safety accident.

In addition, the prior art Korean Patent No. 10-0383453 "Lock bolt construction fixture" has the following problems.

(1) The wing of the metal material inserted into the rock is folded when it is inserted, and the locking force of the lock bolt is lowered, which may cause a safety accident.

(2) Since the lock bolt is inserted after the mortar is completely filled, the mortar flows to the outside as much as the volume of the rock bolt, which is uneconomical and poor in workability.

(3) If the lower rubber sealing device is folded downward when the mortar supply hose is removed, the sealing force of the filling mortar is lost and mortar may flow down.

(4) The installation procedure is complicated because after the sealing device is installed, the mortar supply hose is injected to the upper part and filled, the mortar supply hose is removed, and then the lock bolt is inserted again.

(5) Since a certain number of wings are formed outside and inside and do not meet linearly with the inner wall of the perforation, mortar may flow out because it is not completely sealed.

The present invention has been made in order to solve the problems of the prior art as described above, the filling mortar as an adhesive is supplied to the front end of the rock bolt along the supply hose including a shrinkable soft hose by the pressure of the mortar filled The soft hose is naturally compressed to prevent mortar from flowing down the supply hose.

In order to solve the said subject, this invention is an adhesive rock bolt; A sealing device provided on the lock bolt to prevent the adhesive from flowing down, and the adhesive injection passage is formed; A supply hose made of a flexible hose shrinkable by an external pressure of the adhesive injected into the perforation, one end of which is connected to the adhesive injection passage of the sealing device, and the other end of which extends to the front end of the rock bolt; It comprises a, characterized in that the adhesive is supplied to the front end of the rock bolt along the adhesive injection passage and the supply hose.

In the above, the sealing device is: a female screw portion is formed to be screwed to the rock bolt, the outer peripheral surface of the wedge cap having a wedge portion of the upper and lower side; And a sliding part formed with a hollow to slide on the lock bolt and the sliding part, and a taper is formed on an outer circumferential surface thereof, and a wedge part insertion groove is formed on an inner circumferential surface thereof so that the wedge part can be inserted therein and the wedge part is inserted into the wedge part. An expansion cap which is inserted into a groove and comprises a locking portion having a plurality of cutout grooves formed in a longitudinal direction such that the taper is opened; It is made, and one end of the supply hose is preferably connected to the wedge cap.

In the above, the outer peripheral surface of the wedge cap is formed in the ring-shaped simple fasteners, the inner peripheral surface of the engaging portion is preferably formed in the ring-shaped simple fastening groove into which the simple fasteners are inserted.

In the above, it is preferable that a plurality of anti-rotation jaws for protruding to be inserted into the incision groove on the outer peripheral surface of the wedge cap.

In the above, it is preferable that the air discharge passage is formed in the expansion cap.

Hereinafter will be described in detail the configuration and operation according to an embodiment of the present invention.

1 is a conceptual cross-sectional view of the adhesive rock bolt according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line AA of Figure 1, Figure 3 is a cross-sectional view taken along the line BB of Figure 1, Figure 4 is a CC line of Figure 1 5 is a sectional view taken along line DD of FIG. 1, FIG. 6 is a perspective view of the expansion cap 220, FIG. 7 is a longitudinal sectional perspective view of the expansion cap 220, and FIG. 8 is a perspective view of the wedge cap 210. 9 is a longitudinal sectional perspective view of the wedge cap 210, and FIGS. 10A and 10B are diagrams for explaining the use flowchart of the embodiment of FIG.

Adhesive rock bolt of the present embodiment is largely composed of the lock bolt 100, the sealing device 200, the supply hose fastening clip 300, the supply hose 400.

The rock bolt 100 is a conventional rock bolt having a thread formed on its main surface as shown in FIG. 1.

The sealing device 200 is formed into a wedge cap 210 and the expansion cap 220.

First, the expansion cap 220 will be described with reference to FIGS. 1, 4, 5, 6, and 7.

The expansion cap 220 is formed of the sliding part 221 and the locking part 223 again.

The sliding part 221 has a hollow formed therein, the lock bolt 100 is inserted into the hollow, and thus the sliding part 221 is slidable along the longitudinal direction of the lock bolt 100. On the other hand, the outer circumferential surface of the sliding portion 221 has the form of upper and lower light, the lower end is preferably larger than the diameter of the drilled hole.

The locking portion 223 extends upward from the sliding portion 221 and is opened by the action of the wedge cap 210, so that the locking portion 223 is caught on the wall surface of the perforated hole.

To this end, a plurality of tapers 224 are protruded from the outer circumferential surface of the engaging portion 223, and the inner circumferential surface is formed with a wedge portion insertion groove so as to be spaced apart from the outer circumference of the rock bolt 100 by a predetermined interval so that the wedge cap 210 can be inserted therein. 225 is formed.

In addition, four cutting grooves 226 are formed in the locking portion 223 along the longitudinal direction of the locking portion 223 so that the locking portion 223 can be opened when the wedge cap 210 is inserted into the wedge insertion groove 225. . At this time, the width of the incision groove 226 is the same three, the other one has a larger width than the other incision grooves. This is to give a direction to the wedge cap 210 and the expansion cap 220 so that the adhesive injection passage can be formed in a straight line when assembling the wedge cap 210 and the expansion cap 220.

On the other hand, a simple fastening groove 227 having a ring shape is formed on the inner circumferential surface of the locking portion 223. The simple fastening groove 227 is engaged with the simple fastening protrusion 211 of the wedge cap 210 before the drilling hole insertion of the lock bolt 100 to maintain a temporary fastening state.

On the other hand, the sliding portion 221 of the expansion cap 220 is formed as one of the adhesive injection passage is formed with an adhesive injection passage 222 for the expansion cap, the adhesive injection passage 222 for the expansion cap 220 and the wedge of the expansion cap 220 The secondary insertion groove 225 is connected.

On the other hand, the air discharge passage 228 is formed in the expansion cap 220. The air discharge passage 228 serves as a passage through which the air of the perforated hole escapes to the outside when the mortar is filled after inserting the rock bolt 100 into the perforated hole.

Next, the wedge cap 210 will be described with reference to FIGS. 1, 3, 8, and 9.

The wedge cap 210 has a female screw portion 212 formed therein, and the lock bolt 100 is screwed to the female screw portion 212.

In addition, the wedge cap 210 is formed in the middle portion and the upper portion of the wedge portion 213 having an outer peripheral surface of the upper and lower straits. The wedge portion 213 is inserted into the wedge portion insertion groove 225 of the expansion cap 220 serves to open the locking portion 223.

On the other hand, the lower outer circumferential surface of the wedge cap 210 has a ring-shaped simple fastening protrusion 211 protruding, and the simple fastening protrusion 211 is a simplified portion of the expansion cap 220 before the hole insertion of the rock bolt 100. It is engaged with the fastening groove 227 to maintain a temporary fastening state.

In addition, four rotation preventing jaws 215 are formed on the outer circumferential surface of the wedge cap 210 to be inserted into the cutout groove 226 of the expansion cap 220. In response to the incision groove 226 being divided into three small grooves and one large groove, the anti-rotation jaw 215 is also divided into three small anti-rotation jaws 215 and one large anti-rotation jaw 215.

When the anti-rotation jaw 215 is inserted into the incision groove 226, the wedge cap 210 and the expansion cap 220 is relatively impossible to rotate. That is, when the expansion cap 220 is restrained from being rotated, the restraining force is transmitted to the wedge cap 210 so that the wedge cap 210 also cannot be rotated.

As such, the anti-rotation jaw 215 is constrained to allow the wedge cap 210 and the expansion cap 220 to be rotated in the same manner, and the width thereof is different so as to assemble the wedge cap 210 and the expansion cap 220. To redeem. That is, since the large anti-rotation jaw 215 can be inserted only in the large incision groove 226, the assembled state is always the same. Accordingly, when assembling the wedge cap 210 and the expansion cap 220, the adhesive injection passage can be easily formed in a straight line.

On the other hand, as one of the adhesive injection passage, the wedge cap adhesive injection passage 216 is formed in the wedge cap 210, and the adhesive injection passage 216 for the wedge cap protrudes upward to be easily connected to the supply hose 400. It is.

Next, the supply hose fastening clip 300 will be described with reference to FIGS. 1 and 2.

Supply hose fastening clip 300 is composed of a clip body 310 and the connecting pipe (320).

As shown in FIG. 2, the clip main body 310 has a cross-section "C" shape and is fastened to the lock bolt 100 by opening an open portion to the lock bolt 100 with its elastic force.

The clip body 310 is provided with a connection pipe 320, the connection pipe 320 may be composed of a plastic pipe. When the vinyl hose of the material of the supply hose 400 to be described later is fastened to the connecting pipe 320, one end of the vinyl hose is connected. That is, when the rigid plastic hose other than the vinyl hose is fastened to the supply hose fastening clip 300, only the clip body 310 may be used without the connecting pipe 320.

Next, the supply hose 400 will be described.

The supply hose 400 is a hose for supplying an adhesive, that is, cement mortar, etc., after filling the mortar, the flexible hose portion of the supply hose 400 is pressed by the pressure of the external mortar, thereby automatically drilling inside. Mortar is to be sealed.

In the present embodiment, the material of the supply hose 400 for supplying the adhesive, that is, cement mortar, to the front end of the rock bolt is a soft material that can be sealed by sufficient shrinkage by external pressure such as a vinyl hose or a rubber hose. Is possible.

In addition, according to the embodiment, a part of the supply hose is formed of a soft hose, but the remaining part is formed of a hard plastic hose, it can be used in a state in which the soft hose and the hard plastic hose are assembled.

That is, even if the soft hose which is the main feature of the present invention is provided only on a part of the supply hose 400, the soft hose is pressed by the pressure of the mortar after the filling of the mortar, and consequently, the internal mortar is prevented from flowing along the supply hose. You can do it.

Hereinafter, the construction procedure of the present adhesive rock bolt will be described with reference to FIGS. 10A and 10B.

10A and 10B are for conceptually explaining the construction order, the diameter and length of the rock bolt may vary as much as the actual application.

(a) First, the wedge cap 210 is screwed to the lock bolt 100 to a desired depth.

(b) push the expansion cap 220 into the lock bolt 100, the temporary fastening groove 227 of the expansion cap 220 is to be fastened to the fastening protrusion 211 of the wedge cap 210 temporarily assembled Maintain state. This completes the assembly of the sealing device 200. At this time, the expansion cap 220 and the wedge cap 210 are fastened while maintaining a certain direction by the structure of the anti-rotation jaw 215 and the cutting groove 226.

(c) Fastening the supply hose 400 for the mortar supply using the hose fastening device to the adhesive injection passage 216 of the wedge cap 210 and connected to the front end of the lock bolt 100, the supply hose fastening clip ( Fasten using 300).

(d) Insert the rock bolt 100 into the drilled hole after the assembly of the lock bolt 100, the mortar supply hose 400, the sealing device 200, and the supply hose fastening clip 300 is completed. .

At this time, the upper part of the drilling hole is the left side based on FIG. 10, and the lower part of the drilling hole is the right side based on FIG. 10.

(e) After inserting the drilled hole of the rock bolt 100, by holding the expansion cap 220 from the outside by hand and pulling the rock bolt 100, the rock bolt 100 and the fixed wedge cap 210 are extended cap 220 Inwardly, the locking portion 223 of the expansion cap 220 is opened, and the locking portion 223 is primarily fixed to the wall surface of the drilling hole.

(f) After the expansion cap 220 is fixed, the external mortar injection hose is pushed through the adhesive injection passage 222 for the expansion cap, and the mortar is pushed into the adhesive injection passage 216 for the wedge cap. As the mortar is expanded by the mortar from the upper portion of the perforated hole, the lower air is discharged to the outside through the air discharge passage 228 of the expansion cap 220.

(g) When the mortar filling is completed, that is, the mortar flows to the air discharge passage 228, the external mortar injection operation is completed by stopping and extracting the external mortar injection hose. As soon as the external mortar injection operation is completed, the pressure inside the mortar supply supply hose 400 is released and the soft hose part of the mortar supply supply hose 400 is automatically pressed by the external pressure of the mortar prefilled to the outside. It is sealed.

(h) After finally inserting the pressure plate 120, the nut 110 is fastened to express a stronger sealing force and fixing force, and then completes the installation of the rock bolt.

The above embodiments are merely preferred embodiments of the present invention, and the technical idea of the present invention may be variously modified or adjusted by those skilled in the art. If such modifications or adjustments utilize the technical idea of the present invention, they are within the scope of the present invention.

According to the present invention, after the filling mortar, which is an adhesive, is supplied to the front end of the rock bolt along the supply hose, the soft hose which is naturally shrinkable by the pressure of the filled mortar is compressed to separate the mortar from flowing along the inside of the supply hose. It can be prevented without the work of.

In addition, the present invention can be easily performed by the wedge fastening structure of the wedge cap and the expansion cap to the wall surface of the drilling hole of the closure device.

Claims (5)

In adhesive rock bolts; A sealing device provided on the lock bolt to prevent the adhesive from flowing down, and the adhesive injection passage is formed; A supply hose made of a flexible hose shrinkable by an external pressure of the adhesive injected into the perforation, one end of which is connected to the adhesive injection passage of the sealing device, and the other end of which extends to the front end of the rock bolt; Consisting of, Adhesive rock bolt, characterized in that the adhesive is supplied to the front end of the rock bolt along the adhesive injection passage and the supply hose. The method of claim 1, The closure device is: A female thread portion is formed to be screwed to the rock bolt, and an outer circumferential surface thereof has a wedge cap having a wedge portion of a light beam; And The sliding portion is connected to the sliding portion and the sliding portion is formed to be slid to the lock bolt, the outer peripheral surface is tapered protruding and the inner peripheral surface is formed with a wedge portion insertion groove so that the wedge portion can be inserted and the wedge portion is the wedge portion insertion groove An expansion cap which is inserted into the expansion cap and comprises a locking portion having a plurality of cutout grooves formed in a longitudinal direction such that the taper is opened; Made of Adhesive rock bolt, characterized in that one end of the supply hose is connected to the wedge cap. The method of claim 2, Adhesive lock bolt, characterized in that the ring-shaped simple fastening protrusion is formed on the outer circumferential surface of the wedge cap, the ring-shaped fastening groove is formed in the inner peripheral surface of the engaging portion is formed. The method of claim 2, Adhesive rock bolt, characterized in that the outer circumferential surface of the wedge cap protrudes a plurality of anti-rotation jaw for insertion into the incision groove. The method according to any one of claims 2 to 4, Adhesive rock bolt, characterized in that the air discharge passage is formed in the expansion cap.

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