JP3773993B2 - Rock drilling jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rock drilling jig used for forming a slit-like groove in a rock by sequentially drilling a plurality of holes in the rock with a drilling bit while overlapping a part of the holes. .
[0002]
[Prior art]
Conventionally, for example, when excavating a rock for construction of a tunnel or the like, a blasting method using dynamite or the like has been adopted. However, there were problems such as large vibrations and noises caused by the impact of the blast, which adversely affected the surrounding environment and loosened the surrounding rock mass.
Therefore, a method of statically excavating a tunnel or the like has been adopted.
In this construction method, first, a number of holes are overlapped continuously along the outer periphery of a cross section of a tunnel or the like, and along the boundary of a plurality of regions that divide the cross section. It is formed.
Next, a large number of split rock holes are formed in the area surrounded by the slit-shaped grooves, and a rubber tube type split rock machine is inserted into each split rock hole, and each area is crushed by expanding it.
By repeating the formation of such slit-shaped grooves and the crushing of the region surrounded by the slit-shaped grooves, a tunnel or the like is dug.
[0003]
On the other hand, when a plurality of holes are partially overlapped and continuously drilled to form a slit-like groove by a row of holes, a long length having an arc-shaped recess disclosed in Japanese Utility Model Publication No. 62-29597 has been conventionally used. Pipes are being used.
That is, a long pipe having an arc-shaped recess is inserted into a hole that has already been drilled, and a new hole is drilled while a part of the drill bit faces the recess.
[0004]
[Problems to be solved by the invention]
However, when a long pipe having such an arcuate recess is used, the drilling bit tends to bend in the direction of the already drilled hole due to the resistance of the rock, and therefore hits the arcuate recess violently.
Accordingly, there is a problem in that the damage to the recesses is large, and a large number of long pipes having arcuate recesses must be prepared, which increases costs.
Further, in order to avoid damage to the concave portion, it is conceivable to increase the clearance between the concave portion and the drill bit. However, if the clearance is increased, a wall that is not drilled remains and a slit-like groove is not formed.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a rock drilling jig capable of easily forming slit-shaped grooves without incurring costs.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is to form a plurality of holes having substantially the same diameter in the rock by using a drilling bit, and sequentially drilling the holes in parallel with a part of the holes being overlapped. A rock drilling jig used for forming a groove, which has a first guide rod having substantially the same diameter as the already drilled hole and a smaller diameter than the first guide rod. A second guide bar; and a connecting means for connecting the first guide bar and the second guide bar in parallel with each other with a gap between their outer peripheral surfaces, and the second guide At least the outer peripheral surface of the bar is rotatable.
[0006]
Further, the present invention is characterized in that the second guide rod is rotatably supported by the connecting means.
Further, the present invention is characterized in that the diameter of the first guide rod is configured to be expandable / contractable, and in the expanded state, the diameter becomes substantially the same as the already drilled hole.
Moreover, the present invention is characterized in that the connecting means connects the first guide bar and the second guide bar so that the distance between them can be adjusted.
Further, the present invention is characterized in that the connecting means is constituted by link plates that are respectively disposed at both ends of the first guide rod and the second guide rod and support the guide rods.
In the present invention, the second guide rod includes a boss member supported by the link plate and a pipe member rotatably supported by the boss member. A guide plate portion having a guide hole with which the bit is rotatably engaged is provided.
[0007]
In the present invention, since the drill bit advances while contacting the second guide rod, the outer peripheral surface of the second guide rod also rotates, and the drill bit contacts the entire circumference and the entire length of the second guide rod. In addition, a partially overlapped hole is easily and reliably drilled. Further, the second guide rod is less damaged, and further, commercially available pipe materials and the like can be used as the first guide rod and the second guide rod, respectively, which is advantageous for cost reduction.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, examples of the present invention will be described.
1 (A) is a front view of a rock drilling jig, FIG. 1 (B) is a side view thereof, FIG. 2 (A) is a cross-sectional front view of an essential part of a first guide rod, and FIG. FIG. 3 is an explanatory view of a main section of the second guide bar, FIG. 3 is an explanatory view when using a rock drilling jig, and FIG. 4 is an explanatory view of the relationship between the drilled hole and the first and second guide bars. Indicates.
The rock drilling jig 2 includes a first guide bar 4, a second guide bar 6 having a smaller diameter than the first guide bar 4, and the first guide bar 4 and the second guide bar 6. Are connected in parallel to each other and with a gap S secured between their outer peripheral surfaces.
As shown in FIG. 3, the lengths of the first guide bar 4 and the second guide bar 6 are formed to be slightly larger than the depth of the hole to be drilled. The guide bar 4 and the second guide bar 6 are constituted by a pair of link plates 10 respectively disposed at both ends.
[0009]
As shown in FIG. 2A, the first guide rod 4 includes a support shaft 12, boss members 14 positioned at both ends of the support shaft 12, and pipe material 16 fitted to the boss members 14 at both ends. Etc.
As shown in FIG. 4B, the diameter of the pipe material 16 is substantially the same as the hole H drilled by the drill bit 18 or slightly smaller than the hole H. A commercially available thick-walled pipe is used.
The boss members 14 are arranged inside the pair of link plates 10, the support shafts 12 are inserted into the link plates 10 and the boss members 14 at both ends, and the hexagonal heads of the support shafts 12 are outside the one link plate 10. The first guide rod 4 is connected to the pair of links 10 by tightening the nut 1204 screwed into the male screw portion, and the male screw portion of the support shaft 12 is located outside the other link plate 10. The quadrangular prism portion 1206 is positioned on the support shaft 12 located outside the nut 1204.
[0010]
A right screw portion 1210 and a left screw portion 1212 are formed at portions near both ends of the support shaft 12, and conical bodies 22 and 24, conical members 26 and 28, respectively, corresponding to the right screw portion 1210 and the left screw portion 1212. Is arranged.
Each of the cones 22 and 24 has a conical surface on the outer periphery thereof, and is arranged with a portion having a small diameter facing each other, and the right screw portion 1210 or the left screw portion 1212 is screwed into a female screw penetrating the center. Yes. A key groove (not shown) is formed in the outer peripheral portion of each of the cones 22 and 24 in the extending direction of the support shaft 12, and a key (not shown) fixed to the pipe material 16 side is inserted into this key groove. The cones 22 and 24 are supported so that they cannot rotate.
The inner peripheral portions of the conical members 26 and 28 are formed as conical surfaces that can be engaged with the conical surfaces of the cones 22 and 24, and are fitted to the outsides of the cones 22 and 24.
Therefore, when the nut 1204 is loosened and the quadrangular column 1206 of the support shaft 12 is appropriately rotated with a tool, the conical bodies 22 and 24 move in opposite directions to each other, and the pipe material 16 is connected via the conical members 26 and 28. It is comprised so that a diameter may be expanded / contracted.
[0011]
As shown in FIG. 2B, the second guide rod 6 includes a pipe member 32 and a boss member 34 that is rotatably fitted inside both ends of the pipe member 32.
The outer diameter of the pipe material 32 is formed with a size smaller than the hole H drilled by the drill bit 18 as shown in FIG. 4B, and a thick commercial pipe is used as the pipe material 32. ing.
Each boss member 34 is arranged inside the pair of link plates 10, and as shown in FIG. 1, bolts 36 are inserted into the long holes 1002 of the link plates 10 at both ends and screwed into the central screw holes of the boss members 34. The second guide rod 6 is coupled to the pair of link plates 10 by tightening the bolts 36, whereby the pipe member 32 is rotatably supported via the boss members 34 and the link plates 10.
The bolt 36 can be moved in the long hole 1002 before the bolt 36 is tightened. By moving the bolt 36 in the long hole 1002, the center of the first guide rod 4 and the second guide rod 6 can be moved. The distance may be adjusted, and the first guide rod 4 may be attached via the long hole 1002.
[0012]
The diameter of the pipe material 32, that is, the diameter of the second guide rod 6 is formed to be smaller than the diameter of the already drilled hole H as shown in FIG.
Specifically, the diameter of the second guide bar 6 is set such that the first guide bar 4 is inserted into the already drilled hole H1 and the first guide bar 4 and the link plate 10 are inserted through the first guide bar 4. In the state where the second guide bar 6 is supported in the hole H2 apart from the outer peripheral part of the hole 4, the outer peripheral part of the hole H formed by the drilling bit 18 is in contact with the outer peripheral part of the second guide bar 6. It is formed as follows.
[0013]
Next, a method for using the rock drilling jig 2 will be described.
First, as shown in FIG. 4 (A), the two holes H1 and H2 are overlapped by the drilling bit 18 for drilling.
When the two holes H1 and H2 are overlapped, any one of various conventionally known methods as disclosed in, for example, Japanese Utility Model Publication No. 62-29597 may be used.
[0014]
If the two holes H1 and H2 are overlapped and drilled, the second guide rod 6 is inserted into the hole H2 facing the hole to be drilled next as shown in FIG. The first guide bar 4 is inserted into the hole H1 overlapping the hole H2 into which the second guide bar 6 is inserted, and the rock drilling jig 2 is disposed.
Next, the drill bit 18 is positioned at the position of a new hole to be drilled, and the drill bit 18 is pressed against the lower surface of the second guide rod 6.
In this state, as shown in FIG. 3, the drill bit 18 is advanced while rotating.
In FIG. 3, reference numeral 40 denotes a frame for the drilling device. Installed and used. The gantry 40 has a bracket 42 at the tip thereof. The bracket 42 is guided with a rotating rod 44 to which the drill bit 18 is attached. On the gantry 40, a rotation driving means (rotation driving means for rotating the rotating rod 44 ( (Not shown) and moving means (not shown) for moving the rotating rod 44 in the axial direction are provided, and the hole H is drilled by the drill bit 18 by moving the rotating rod 44 forward while rotating.
[0015]
When the drill bit 18 is advanced while rotating, a force that is pushed upward from the drill bit 18 acts on the second guide rod 6, but the first guide rod 4 is pressed into the hole H1. The position of the second guide bar 6 in the hole H2 does not move, and the second guide bar 6 functions as a guide for the drill bit 18.
Since the drill bit 18 moves forward while being in contact with the second guide rod 6, the second guide rod 6 also rotates, and the drill bit 18 contacts over the entire circumference and the entire length of the second guide rod 6. Therefore, there is no problem such that the second guide rod 6 is partly worn.
Therefore, the second guide bar 6 is less damaged and there is no inconvenience such as frequent replacement of the second guide bar 6.
[0016]
In this way, as shown in FIG. 4C, a new hole H3 partially overlapping with the existing two holes H1 and H2 is surely cut.
When the new hole H3 is drilled, the rock drilling jig 2 is extracted from the holes H1 and H2, and thereafter the second guide rod 6 is similarly inserted into the hole H3 facing the hole to be drilled next. Is inserted, and the first guide rod 4 is inserted into the hole H2 that overlaps the hole H3 into which the second guide rod 6 is inserted, and the drill bit 18 is positioned at the position of the new hole to be drilled. Then, the drill bit 18 is pressed against the lower surface of the second guide rod 6, and the drill bit 18 is advanced while rotating, so that a slit-like groove 50 is formed.
[0017]
Therefore, according to the present embodiment, the slit-like groove 50 can be formed with a simple configuration using a commercially available pipe, which is advantageous for cost reduction.
Further, the second guide rod 6 is rotated by contact with the drill bit 18, and the drill bit 18 contacts the entire circumference and the entire length of the second guide rod 6, so that the second guide rod 6 is less damaged. .
[0018]
Further, in this embodiment, when the nut 1204 is loosened and the quadrangular column 1206 of the support shaft 12 is appropriately rotated with a tool, the conical bodies 22 and 24 move in opposite directions to each other via the conical members 26 and 28. Since the diameter of the pipe member 32 is expanded and contracted, the first guide rod 4 can be securely fixed in the hole H by inserting the first guide rod 4 into the hole H and then increasing the diameter. This is advantageous in smoothly drilling the hole H.
In this embodiment, a long hole 1002 is formed in the link plate 10, and the distance between the centers of the first guide bar 4 and the second guide bar 6 is increased by loosening and tightening the bolt 36 in the range of the long hole 1002. Since it can be changed, for example, it is possible to easily cope with a case where the dimension of the portion where the hole H overlaps is changed.
[0019]
As shown in the front view in FIG. 5A and the side view in FIG. 5B, the drill bit 18 is rotatably engaged with one of the boss members 34 of the second guide rod 6. If the guide plate portion 64 having the guide hole 62 is integrally provided, the drill bit 18 can be prevented from escaping and bending to perform drilling at the initial stage of drilling with high accuracy, and the overlapping hole H can be cut with high accuracy. This is advantageous in making holes. In this case, the guide plate portion 64 can be constituted by, for example, a pair of arcuate guide pieces 6404 sandwiching the slit 6402.
[0020]
【The invention's effect】
As is apparent from the above description, the present invention is to form a plurality of holes having substantially the same diameter in the rock using a drilling bit, and drill the holes in parallel with a part of the holes being overlapped. A rock drilling jig used for forming the groove of the first guide rod having a diameter substantially the same as that of the already drilled hole, and a diameter smaller than that of the first guide rod. A second guide rod having a second guide rod, and a connecting means for connecting the first guide rod and the second guide rod in parallel with each other with a gap between their outer peripheral surfaces. At least the outer peripheral surface of the rod was configured to be rotatable.
Therefore, a rock drilling jig can be configured with a simple structure using a commercial product without cost, and the second guide bar also rotates, so that the guide bar is less damaged, and therefore the frequency of replacement is low. Therefore, it is possible to easily and reliably form a slit-like groove.
[Brief description of the drawings]
FIG. 1A is a front view of a rock drilling jig, and FIG. 1B is a side view thereof.
2A is a cross-sectional front view of main parts of a first guide rod, and FIG. 2B is a front cross-sectional view of main parts of a second guide bar.
FIG. 3 is an explanatory diagram when using a rock drilling jig.
FIG. 4 is an explanatory diagram of a relationship between a drilled hole and first and second guide bars.
5A is a front view of a rock drilling jig according to another embodiment, and FIG. 5B is a side view of the same.
[Explanation of symbols]
2 Rock drilling jig 4 First guide bar 6 Second guide bar 8 Connecting means 10 Link plates 16, 32 Pipe material 18 Drilling bit

Claims (6)

A rock drilling hole used to form slit-like grooves in the rock mass by drilling a plurality of holes of approximately the same diameter in the rock mass with a drilling bit in parallel with a part of the holes overlapped in parallel. A jig for
A first guide rod having substantially the same diameter as the already drilled hole;
A second guide bar having a smaller diameter than the first guide bar;
A connecting means for connecting the first guide bar and the second guide bar in parallel with each other and with a clearance between their outer peripheral surfaces;
At least the outer peripheral surface of the second guide rod is rotatable;
A rock drilling jig characterized by that. The rock drilling jig according to claim 1, wherein the second guide rod is rotatably supported by the connecting means. The rock drilling jig according to claim 1, wherein the diameter of the first guide bar is configured to be expandable / contractable, and the diameter of the first guide rod is substantially the same as that of the already drilled hole. The rock drilling jig according to claim 1, wherein the connecting means connects the first guide bar and the second guide bar so that the distance between them can be adjusted. 2. The rock drilling jig according to claim 1, wherein the connecting means is constituted by link plates that are respectively disposed at both ends of the first guide bar and the second guide bar and support the guide bars. The second guide rod includes a boss member supported by the link plate and a pipe member rotatably supported by the boss member, and a drill bit is rotatably associated with one of the boss members. The rock drilling jig according to claim 5, wherein a guide plate portion having a guide hole to be joined is provided.

Images