KR200149280Y1 - The fixing device of rock bolt - Google Patents

Abstract

This design, for example, is intended to lock the tip of the lock bolt inside the hole that is drilled in the rock in the rock bolt installed to prevent the ground collapse such as the tunnel inner wall. It is an object of the present invention to provide a locking device for ground collapse prevention lock bolts designed to securely lock a long length of lock bolts that are difficult to fix by means.

Therefore, this proposal inserts the lock bolt 4 into the hole 2 of the rock 3 while the lock bolt 4 is fastened to the moving shaft 23 of the rock fixture 10. After the lock bolt 4 is completely inserted, the lock bolt 4 is inserted. When pulled out again slightly, the locking piece 15 provided in the split fixing piece 12 is caught on the inner circumferential surface of the hole 2 so that the fixed body 11 does not come out and only the moving shaft part 23 is moved. The circular portion 25 of the shaft portion 23 pushes the gradient surface portion 19 of the split fixing piece 12 of the fixed body 11 outward, so that the split fixing piece 12 opens outward and opens the hole 2. It is intended to be fixed at.

Description

Fixing device for rock bolt for preventing ground collapse

1 is a cross-sectional view showing an example of the state of use of the lock bolt conventionally carried out.

2A and 2B are cross-sectional views illustrating fixing of a conventional lock bolt.

Figure 3 is an exploded perspective view showing a lock bolt fixture according to the present invention.

4 is an assembled perspective view of the lock bolt fixture of the present invention.

5 is a cross-sectional view along the line a-a 'in FIG.

6 is a front view showing the appearance of the lock bolt according to the present invention.

7 is a cross-sectional view along the line b-b 'of FIG.

8a, b is a cross-sectional view taken along line c-c 'of FIG. 5 showing the operating state of the lock bolt according to the present invention.

FIG. 9 is a cross-sectional view taken along the line d-d 'of FIG. 8B and is a schematic diagram showing the operation.

* Explanation of symbols for main parts of the drawings

1: tunnel 2: hole

3: Rock 4: Lock Bolt

5: plate washer 6: nut

10: rock fixing fixture 11: fixed body

12: split fixing 13: disk

14: connecting piece 15: locking piece

18: engaging jaw 19: gradient surface portion

20: coil spring 23: moving shaft

24: screw hole 25: circular part

26: taper portion 27: center projection

The present invention relates to a lock bolt for preventing ground collapse, which is installed to prevent the collapse of the ground inside a tunnel that is drilled during subway, railroad or road dredging. The present invention relates to a lock device for preventing ground collapse, which is designed to be used.

In general, the ground bolt for preventing the collapse of the ground is mainly used to prevent the collapse of the tunnel inside, but it is widely used as other ground collapse prevention lock bolts such as floor reinforcement and side reinforcement of underground structures.

Figure 1 is a cross-sectional view showing a tunnel showing an example of the use of the lock bolt, when the tunnel (1) is drilled to drill a hole (2) in several places on the wall, at this time, a hole in the rock (3) This drill is inserted into the lock bolt (4) and then fixed so as to be fastened by the plate washer (5) and the nut (6) to prevent the collapse of the ground supporting the tunnel wall surface.

The lock bolt 4 is fixed while being inserted into the hole 2. In the conventional fixing method, the tip-bonding type as shown in Fig. 2a and the front-adhesive type as shown in Fig. 2b are fixed. There is this.

In the end-bonded fixing method of the lock bolt, the resin is contained in the glass capsule (7). The glass capsule (7) is first inserted into the rock (3) by the hole (2). By inserting the lock bolt (4), the capsule is broken at the tip and the lock bolt is fixed to the rock by the resin spilled out, and then the cement mortar (8) is filled and completely fixed.

In the front-bonding fixing method of the lock bolt, the lock bolt 4 is inserted into the hole 2 and the cement mortar 8 is filled and solidified using a separate mortar filling machine and mechanism. As mentioned above, the fixing methods listed above have their own characteristics, but are suitable for the relatively short lock bolt fixing method of 3-5 m, which is usually used in subway and road tunnels.

For example, in the case of mines, power plants, and water tunnels, thicker, longer (15 m) lock bolts should be used to reinforce the reinforcement, in which case the holes drilled in the rock are of such length. When the hole is drilled and the glass capsule containing the resin is inserted into it and fixed by the end-adhesive fixing method, the glass capsule is broken inside the end of the hole, so it is not adhered by the resin and the length of the hole is long. As it was broken in the middle of the entry, the existing method of the end-glued type was unable to secure the lock bolt or caused a problem that the desired fixing was not achieved.

In addition, the length of the lock bolt fixed in the long length is too long for the cemented mortar to fill the hole, so that the existing mortar filling machine or mechanism makes it difficult to completely mortar to the innermost part of the hole. There was a problem that can not.

The purpose of this paper is to provide a secure fixation for fixing a relatively long lock bolt to a hole drilled in a rock in view of the above-mentioned conventional problems, and another purpose is to provide a long lock bolt. It is intended to be more quickly and easily fixed to the hole drilled in the rock.

In order to achieve the above object, the present invention has three divided fixing pieces, each of which is divided into lock bolts by rock anchors, which are configured to be spread out toward the outer side by moving shaft rods connected to long-length lock bolts. The leading end of the can be fixed to the hole drilled in the rock.

Therefore, the present invention has a three-part split fixing piece, a movable shaft rod for spreading the split fixing piece outwardly, and a disk and a plurality of connecting pieces for forming the split fixing piece in a circular shape, and the splitting. It is intended that the characteristics of the rock fixture that is provided with a locking piece for locking the fixing piece to the inner periphery of the rock.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 to 9 of the figure shows the rock fixture 10 according to the present invention, the rock fixture 10 according to the present invention is composed of a fixed main body 11 and the moving shaft portion 20.

The fixed body 11 is configured to have a three-part divided fixing piece 12 having a circumferential shape in a circumferential state, and the divided fixing piece 12 is a disk sphere 13 and a connecting piece configured to be positioned in the side direction ( 14), each of the split fixing pieces 12 constitutes the fixed body 11 by one disc sphere 13. As shown in FIG.

In addition, the outer peripheral portion of the split fixing piece 12 is configured to have a structure in which the engaging pieces 15 having a flapping angle that extends in the outward direction are respectively fixed, and the locking piece 15 and the connecting piece 14 are divided fixing pieces. It is fixed by the rivet 17 in the state of being inserted into the fixing groove 16 formed in the outer periphery of the (12) and also fixed by the rivet 17 'in the fixing of the hemisphere 13 and the connecting piece 14 It is supposed to be.

In addition, the outer periphery of the split fixing piece 12 is provided with a plurality of locking jaws 18, and the inner periphery is configured to form a gradient surface portion 19 which is inclined from the side to the rear side so that the three split fixing pieces ( In the state in which 12 is formed in a circular shape, the rear diameter D2 is configured to have a smaller diameter as compared to the front diameter D1 as shown in FIG. 7, while the rear end of the split fixing piece 12 has a coil spring 20. The three split fixing pieces 12 are configured to be interconnected by

The coil spring 20 is installed in a structure in which both ends are fixed by fixing pins 22 in a state of being fitted into spring grooves 21 respectively formed on both sides of the split fixing piece 12.

The moving shaft portion 23 inserted into the split fixing piece 12 has a screw hole 24 for fastening with the lock bolt 4 at the center thereof, while forming a circular portion 25 on the side. It is comprised so that the taper part 26 may be formed in the rear side.

In addition, the attachment of the moving shaft 23 is provided with a central protrusion 27 which is inserted into and detached from the central hole 13a of the disc.

Referring to FIG. 8 and FIG. 9, this proposal will be described as follows.

Since the rock fixture 10 of the present invention has a structure in which the moving shaft portion 23 moves forward and backward in the fixed body 11, the moving shaft portion 23 is a rock (with the lock bolt 4 fastened). 3) When inserted into the hole (2) drilled in, the moving shaft portion 23 is moved in the lateral direction to push the hemisphere 13 of the fixed body 11, the split fixing piece (12) connected to the connecting piece (14) ), Including the entire rock fixture 10 is pushed.

Therefore, when the rock fixture 10 is inserted into the innermost part of the hole 2 as shown in FIG. 8A and no longer enters, the lock bolt 4 is pulled back out slightly back.

That is, when the lock bolt 4 is pulled, the moving shaft portion 23 which is fastened is pulled out and then moved in the aft direction. Unlike this, the fixed body 11 does not come out of the state once entered. I can't. It enters smoothly when the catching piece 15 enters, but when it comes out again, the catching piece 15 in a state that is opened outwards is dug into the inner circumferential wall of the hole 2 so that the moving shaft part 23 comes out again. In the process of being moved in the rearward direction, the fixed body 11 is in a state where the locking piece 15 is locked in the hole 2 so that the movement to the rearward side becomes impossible.

Of course, the locking body 15 is pushed back slightly by the movement force of the movable shaft 23 at the time when the movable shaft 23 is retracted by pulling the lock bolt 4, and the locking piece 15 is opened. (2) It is to be caught on the inner circumferential wall, but since the fixing body 11 is only slightly moved to catch the catching piece 15 in the hole 2, such a movement is negligible in this paper. The city of was omitted.

Therefore, when the moving shaft portion 23 is moved to the rear in the state in which the fixed body 11 is primarily locked by the locking piece 15 in the hole 2 as described above, the inner circumferential surface of the split fixing piece 12 Since it has this gradient surface part 19, as the circular part 25 of the moving shaft part 23 moves back, as shown in FIG. 8B, the division fixing piece 12 will be pushed outward.

Therefore, as the split fixing piece 12 is pushed as described above, the split fixing piece 12 is caught in a state in which the engaging jaw 18 of the outer circumferential surface is in contact with the inner circumferential wall of the hole 2 to dig into the wall. As the fixed shaft 12 moves further toward the rear, the fastening and tightening force become stronger as the movable shaft section 23 moves to the rear side, and the partition is separated between the inner circumferential wall of the hole 2 and the movable shaft section 23. The moving shaft portion 23 is moved backward until the fixing piece 12 is completely pinched, and when this movement is no longer prevented, the rock fixture 10 at the tip of the lock bolt 4 is removed. ) Is to be completely fixed at the innermost side of the hole (2), so that the tip of the lock bolt (4) fastened thereto is fixed.

Therefore, as described above, in the present proposal for fixing the tip of the lock bolt 4 in the hole 2, the hole 2 is drilled in the rock 3, but in the state where the hole is drilled, sometimes there is a part with soil. It may come out, and thus the rock fixture 10 may be in a state that must be fixed in the soil part, even in this case the rock fixture 10 of the present in the soil by the elastic engaging piece (15) 1 At the same time, the secondary locking and fixing by the split fixing piece 12 are secured at the same time as the secondary locking, and the fixing in the hole 2 which is made of only a rock is worthy of mention.

In this state, the tip of the lock bolt 4 is fixed in the hole 2 so that the inside of the hole is cement mortar, and then the work is completed by inserting a plate washer and tightening the nut. .

In this paper, the coil spring 20 connecting the split fixing piece 12 acts a pull spring force to pull the split fixing piece 12 itself, so that the split fixing piece 12 moves. (23) to perform a function to be pinched in the direction (inward direction). For example, when the coil spring 20 is not present, the split fixing piece 12 flows arbitrarily, making it difficult to handle, and the spreading of the split fixing piece 12 by the moving shaft 23 is not uniform and smooth. In the case of rock fixation, they do not function properly.

According to the above description, the lock bolt can be reliably fixed to the rock hole in fixing the long lock bolt by the present invention, while the rock fixture 10 is simply fastened to the tip of the lock bolt 4 and the hole (2) is secured. Fastening the lock bolt slightly to the rear and then fixing it by the easy fixing operation.It is very easy and quick to fix the lock bolt of long length in the hole drilled in the long length. It is a very useful design that can secure the lock bolt having.

Claims (1)

The movable shaft 23 having a tapered portion engaged with the lock bolt 4, the fixed body 11 into which the movable shaft 23 is inserted, is divided into a plurality of divided fixing pieces 12, and a lock bolt 4. For the ground collapse prevention comprising a disk (13) is inserted into the final insertion, the connecting piece 14 for connecting the split fixing piece 12 and the disk (13), and the locking piece (15) connected to the connecting piece (14) In the fixing device of the lock bolt; Fixing device of the ground collapse prevention lock bolt, characterized in that configured to have a plurality of divided fixing piece 12 is connected by a coil spring (20) to have an elastic force.