JP3748291B2 - Rock drilling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rock drilling device that forms a slit-like groove in a rock by drilling a plurality of holes close to each other during tunnel excavation or the like.
[0002]
[Prior art]
Conventionally, for example, when excavating a rock for construction of a tunnel, 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 has been adopted.
In this construction method, first, a large number of holes are adjacently drilled along the outer periphery of the face of the tunnel and so as to divide the face into a plurality of regions, and a slit-like groove is formed by a row of holes. .
Next, for example, a large number of split rock holes are drilled in the region surrounded by the groove, and a rubber tube type split rock machine is inserted, and each region is destroyed by expanding it.
And a tunnel is dug by repeating formation of such a slit-shaped groove | channel and crushing of the area | region enclosed by the slit-shaped groove | channel.
[0003]
In this construction method, a rock drilling device such as that disclosed in Japanese Patent Application No. 1-343073 is used when a plurality of holes are drilled close to form a slit-like groove. In this rock drilling device, as shown in FIG. 9A, a drifter 4 is movably provided on a gantry 2, and a bracket 8 is moved in front of the drifter 4 by a hydraulic cylinder 6 supported by the drifter 4. A guide rod 10 is attached to the bracket 8 so as to be movable on the gantry 2, and the guide rod 10 is inserted and supported by a rod support 12.
A rotating rod 14 is attached to the drifter 4 in parallel with the guide rod 10, and the rotating rod 14 is inserted through the bracket 8 and supported by the bracket 8 so as to be slidable in the longitudinal direction.
A drill bit 16 is fixed to the tip of the rotating rod 14, and the rotating rod 14 is rotatably supported by a rod support 12.
Further, as shown in FIG. 9B, the guide rod 10 is configured to maintain a constant distance from the drill bit 16 during drilling.
[0004]
[Problems to be solved by the invention]
In such a conventional rock drilling device, since the guide rod 10 is connected to the drifter 4, the guide rod 10 cannot be inserted in advance to the bottom of the hole 18, and the gantry 2 is not stably supported.
Moreover, the length of the guide rod 10 becomes a dimension corresponding to the length of the gantry 2, and for example, the guide rod 10 cannot be rotatably supported.
[0005]
There is also a drilling machine in which a bracket is provided at the tip of the gantry and a guide rod is projected forward by being fixed to the bracket. However, with such a configuration, the overall length of the drilling machine is increased. When inserting / removing the guide rod into / from the hole, the entire hole drilling machine has to be moved forward or backward, resulting in a problem that the construction efficiency is greatly reduced.
Therefore, the object of the present invention is to stably support the gantry, to perform the drilling work quickly and to greatly improve the construction efficiency, and the length of the guide rod is sufficient, and the apparatus is made compact. The object of the present invention is to provide a rock drilling device that makes it possible.
[0006]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a gantry, a rotating rod supported on the gantry so as to be rotatable and movable in the axial direction, a drill bit attached to the tip of the rotating rod, and the rotating Drive means for rotationally driving the rod, moving means for moving the rotary rod in the axial direction, and a guide rod that is supported by the gantry in parallel with the rotary rod and inserted into a hole already drilled in the rock In the rock drilling device, the support means provided at the tip of the gantry and supporting the guide rod movably in the longitudinal direction thereof, and provided at the tip of the gantry, the guide rod cannot be moved in the longitudinal direction. A holding means for holding the guide rod so as to be, an expansion / contraction means provided behind the guide rod on the frame and extending / contracting along the longitudinal direction of the guide rod, and provided at the tip of the expansion / contraction means, Tip of the reduced section is characterized by providing an engaging means for disengageably engaging the rear portion of the guide rod in a state of facing the rear end of the guide rod.
[0007]
In the present invention, the gantry is provided with a retracting means for retracting the expansion / contraction means in a direction away from the rotating rod and the guide rod.
Further, the present invention is characterized in that a bracket is erected at the tip of the mount, and the support means and the holding means are provided on the bracket.
Further, according to the present invention, the expansion / contraction means is connected to a fluid pressure cylinder extending coaxially with the guide rod, and connected to a piston rod of the fluid pressure cylinder, extending coaxially with the piston rod, and the tip thereof is guided. It is comprised by the contact member which can contact | abut on the rear end of a rod, It is characterized by the above-mentioned.
In the present invention, the engaging means includes a pair of openable and closable arms supported on the expansion and contraction means side, and a fluid pressure cylinder for opening and closing the pair of arms, and the pair of arms are closed. The guide rod is held and is configured to be separated from the guide rod in an open state.
The present invention also includes an arm that can swing up and down about a shaft on which the retracting means is supported on the gantry side, and a fluid pressure cylinder that swings the arm, and the expansion and contraction means is supported by the arm. The telescopic means is arranged coaxially with the guide rod behind the guide rod while the arm swings downward by the operation of the fluid pressure cylinder, and the arm swings upward by the operation of the fluid pressure cylinder. It is a retreat position in a state.
[0008]
In the present invention, when drilling a hole close to a hole that has already been drilled, first, the gantry is moved to align the tip of the guide rod with the hole already formed in the rock mass.
And a holding means is open | released and a guide rod is inserted in the hole of a rock mass through an expansion-contraction means and an engagement means.
Next, the guide rod is held by the holding means, and then the connection between the guide rod and the expansion / contraction means is disconnected by the engaging means.
In the invention having the retracting means, after the connection between the guide rod and the expansion / contraction means is disconnected, the expansion / contraction means and the engagement means are displaced to a position away from the guide rod and the rotating rod by the retracting means.
Then, the rotating rod is rotated by the driving unit, the rotating rod is advanced by the moving unit, and drilling is performed by the drilling bit.
After the drilling is completed, the drill bit is extracted from the hole. At this time, the guide rod is connected to the expansion / contraction means by the engaging means, and the guide rod is extracted by the expansion / contraction means.
In the invention provided with the retracting means, the retracting means displaces the expansion / contraction means to the rear of the guide rod, the engaging means connects the guide rod and the expanding / contracting means, and the extending / contracting means extracts the guide rod.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a rock drilling device according to the present invention will be described.
1 is an overall perspective view of the rock drilling device, FIG. 2 is a perspective view of the main part of the rock drilling device, FIG. 3 is a front view of the main portion, FIG. 4 is a plan view of the main portion, and FIG. ), (B) are explanatory views of the engaging means.
In FIG. 1, reference numeral 20 denotes a long frame of the hole drilling device. The right side in the figure is the front and the left side is the rear. The frame 20 has a bracket 22 at the tip, and the hole 22 is drilled in the bracket 22. An attached rotating rod 26, guide rod 28, and the like are provided.
The front portion of the rotating rod 26 penetrates the bracket 24 and is supported by the bracket 22 so as to be rotatable and movable in the longitudinal direction. A drilling bit 24 is attached to the tip of the rotating rod 26.
The rotating rod 26 is hollow, and the hollow portion is connected to a plurality of openings provided on the front surface of the drill bit 24.
[0010]
At the time of drilling, water is injected into the hollow portion from the rear end of the rotating rod 26, and the water is ejected from the opening of the drill bit 24.
A rod support 30 is provided at a position behind the bracket 22 on the gantry 20 and rotatably supports the rear portion of the rotating rod 26.
Further behind the rod support 30, a drifter 34 is provided on the gantry 20 via a bracket 32 so as to be movable back and forth, and the other end of the rotating rod 26 is attached to a drifter 34 (corresponding to a driving means). The rotary rod 26 is rotationally driven by the drifter 34.
A hydraulic cylinder 36 (corresponding to a moving means) is provided between the gantry 20 and the bracket 32, and the drifter 34 is moved through the bracket 32 by the expansion and contraction of the hydraulic cylinder 36, whereby the drifter 34, the rotating rod 26, The drill bit 24 is moved integrally in the longitudinal direction of the rotating rod 26.
The guide rod 28 is supported so as to be movable in the longitudinal direction in parallel with the rotating rod 26 at 22 brackets above the rotating rod 26.
The guide rod 28 is also hollow, and air or water is injected from the rear end during drilling, and they are ejected from the front end of the guide rod 28.
[0011]
In the present invention, the holding means 40 that holds the guide rod 28 and prevents the movement of the guide rod 28 in the axial direction, the support means 41 that supports the guide rod 28 so as to be movable in the axial direction, and the rear of the guide rod 28. The extending / contracting means 42, the engaging means 44 provided at the front end of the expanding / contracting means 42 and detachably engaged with the rear end of the guide rod 28, and the expanding / contracting means 42 in a state where the engaging means 44 is opened. A retracting means 46 that swings in the direction crossing the axis of the guide rod 28 is provided.
[0012]
The holding means 40 includes a hydraulic cylinder 50 attached to the bracket 22 at the tip of the gantry 20 and a chuck that is slightly opened and closed by the hydraulic cylinder 50.
As shown in FIG. 3, this chuck comprises a semi-cylindrical lower chuck claw 5002 and an upper chuck claw 5004 that sandwich the guide rod 28 from above and below, and the upper chuck claw 5004 moves up and down by the operation of the hydraulic cylinder 50. When sandwiched between the upper and lower chuck claws 5002 and 5004, the guide rod 28 cannot move in the axial direction, and when opened, it can move in the axial direction.
When the upper chuck claw 5004 is opened, the opening amount is small, so that the guide rod 28 is configured to be guided so as to be movable in the axial direction. Therefore, in this embodiment, the chuck is guided. The support means 41 of the rod 28 is also used. In the present invention, the support means 41 may be any means as long as it supports the guide rod 28 so as to be movable in the longitudinal direction at the tip of the gantry 20, and for example, a bearing hole or a bearing portion provided in the bracket 22, or these What added the said chuck | zipper to the bearing hole or the bearing part, etc. may be sufficient.
[0013]
The expansion / contraction means 42 includes a hydraulic cylinder 52 which is a fluid pressure cylinder, and a columnar contact member 56 provided at the tip of a rod 54 which can be moved forward and backward by the hydraulic cylinder 52. The contact member 56 is provided behind the guide rod 28 and coaxially with the guide rod 28.
[0014]
The engaging means 44 includes a pair of arms 72 provided on the contact member 56, a hydraulic cylinder 64 that opens and closes the arms 72, and the like.
The base of the hydraulic cylinder 64 is supported by a bracket 58 of an abutting member 56 so as to be swingable through a shaft 62, and a tip of a rod 68 of the hydraulic cylinder 64 and a rear end of an arm 72 are connected to a shaft 70. Yes.
The arm 72 has a rear end portion pivotally supported by a bracket 60 of the abutting member 56 via a shaft 66, the tip of the arm 72 extends forward of the abutting member 56, and a chuck 74 is provided at the tip. Yes.
Accordingly, as shown in FIG. 5 (A), the rod 68 of the hydraulic cylinder 64 is extended and the pair of arms 72 are swung inwardly about the shaft 66 so that the chuck 74 can reduce the small diameter portion at the rear end of the guide rod 28. 2802 is held. Further, as shown in FIG. 5B, when the rod 68 of the hydraulic cylinder 64 is contracted, the pair of arms 72 swings outward about the shaft 66, and the chuck 74 is separated from the guide rod 28.
[0015]
As shown in FIGS. 3, 4, 6, and 7, the retracting means 46 includes an L-shaped bracket 78 that is vertically attached to the gantry 20, and an arm that connects the bracket 78 and the hydraulic cylinder 52. 82 and a hydraulic cylinder 90 that swings the arm 82 in the vertical direction.
The upper portion of the bracket 78 is connected to the arm 82 via a shaft 80, the base portion of the hydraulic cylinder 90 is swingably supported to the lower portion of the bracket 78 via a shaft 84, and the tip of the rod 86 of the hydraulic cylinder 90 is a shaft. It is connected to the arm 82 via 88.
Then, as shown by the solid line in FIG. 7, when the rod 86 of the hydraulic cylinder 90 is reduced, the hydraulic cylinder 52 and the abutting member 56 constituting the expansion / contraction means 42 are coaxial with the guide rod 28 behind the guide rod 28. When the rod 86 is extended by the hydraulic cylinder 90 as shown by the imaginary line in FIG. 7, the hydraulic cylinder 52, the contact member 56, and the engaging means 44 constituting the expansion / contraction means 42 are connected to the shaft 80. It is configured to swing as a fulcrum and to be displaced obliquely upward from the initial position.
[0016]
Next, an operation of drilling a large number of holes close to each other will be described.
First, as shown in FIGS. 8A and 8B, the guide rod 28 is inserted into a hole H formed in the rock mass R in advance.
In this work, first, the tip of the guide rod 28 held by the engaging means 44 at the tip of the expansion / contraction means 42 is aligned with the hole H formed in the rock mass R.
And the chuck | zipper of the holding means 40 is open | released, the guide rod 28 is made into the state which can move to a longitudinal direction, and the hydraulic cylinder 52 of the expansion-contraction means 42 is expanded. As a result, the guide rod 28 advances through the engaging means 44, and the guide rod 28 is inserted and fixed to the bottom of the hole H. Thereby, the bracket 22 is also firmly fixed to the rock mass R.
In the state where the engaging means 44 grips the rear end of the guide rod 28, a gap is formed between the rear end of the guide rod 28 and the front end of the contact member 56. For example, the guide rod 28 When the guide rod 28 slides against the gripping force of the engaging means 44 and the guide rod 28 slides backward, the rear end of the guide rod 28 comes into contact with the contact member 56. Yes.
[0017]
When the guide rod 28 is inserted into the hole H, the chuck of the holding means 40 is closed, and the guide rod 28 is held by the bracket 22 at the tip of the gantry 20 in a state in which the guide rod 28 cannot move in the longitudinal direction.
Next, the rod 68 of the hydraulic cylinder 64 is contracted to swing the pair of arms 72 outward, the chuck 74 is opened, and the connection between the guide rod 28 and the expansion / contraction means 42 is disconnected.
Next, as shown in FIG. 8C, the rod 86 of the hydraulic cylinder 90 of the retracting means 46 is extended, and the expansion / contraction means 42 and the engaging means 44 are retracted obliquely upward to stand by.
As a result, even if the drilling by the drilling bit 24 progresses and the drifter 34 approaches the rear of the guide rod 28, there is no obstacle in moving the drifter 34 and a path is secured, so that the drilling of the deep hole is ensured. Holes are possible.
[0018]
Next, as shown in FIG. 8D, the rotating rod 26 is rotated at a high speed by the drifter 34, the drill bit 24 is gradually advanced by the hydraulic cylinder 36, and the guide rod is adjacent to the hole H into which the 28 is inserted. Drill holes.
When the drilling is completed, as shown in FIG. 8E, the drifter 34 is moved to the rear end of the gantry 20 by the hydraulic cylinder 36, and the drill bit 24 is extracted from the hole H.
Next, as shown in FIG. 8F, the retracting means 46 returns the expansion / contraction means 42 and the engagement means 44 to their original positions, and the expansion / contraction means 42 and the guide rod 28 are arranged coaxially.
[0019]
Next, the expansion means 42 and the guide rod 28 are connected by holding the small diameter portion 2802 at the rear end of the guide rod 28 by the engaging means 44.
Next, as shown in FIG. 8 (G), the hydraulic cylinder 52 of the expansion / contraction means 42 is contracted to pull out the guide rod 28 from the hole H, and preparations for aligning the guide rod 28 with the hole H of the rock mass R that has just been formed. I do.
[0020]
According to the present embodiment, the extending and retracting means 42 provided on the gantry 20 allows the guide rod 28 to move forward and backward separately from the axial movement of the drilling bit 24, so that the drilling by the drilling bit 24 is performed. Before, the guide rod 28 can be inserted to the bottom of the hole H, so that the gantry 20 can be stably supported, and the efficiency of the drilling operation can be increased.
Further, since the guide rod 28 can be moved forward and backward while the rock drilling device is stationary, the guide rod 28 can be quickly inserted and pulled out, and the construction efficiency can be greatly improved.
Further, since the guide rod 28 can be moved forward and backward independently from the drill bit 24, the length of the guide rod 28 suffices to correspond to the depth of the hole H to be drilled. The total length of the rock drilling device can be shortened, and it is advantageous also when the guide rod 28 is rotatably supported or when only the outer peripheral surface of the guide rod is configured to be rotatable.
[0021]
Further, since the guide rod 28 and the expansion / contraction means 42 can be separated by the engaging means 44 when drilling with the drill bit 24, vibrations from the guide rod 28 are not transmitted to the expansion / contraction means 42 during drilling. This is advantageous in terms of durability of the expansion / contraction means 42 and the engagement means 44.
Further, in the embodiment, the retracting means 46 is provided, and the expanding / contracting means 42 and the engaging means 44 are displaced away from the rotating rod 26 and the guide rod 28 at the time of drilling. For example, a large drifter 34 is used. Even if there is no obstacle, the drift of the drifter 34 is not obstructed. Therefore, the hole H can be deeply drilled using the large drifter 34.
[0022]
The expansion / contraction means 42 may be configured using a link mechanism or the like. However, if a fluid pressure cylinder such as a hydraulic cylinder is used as in the embodiment, it can be manufactured at low cost and a reliable movement can be obtained.
[0023]
【The invention's effect】
As is apparent from the above description, according to the present invention, a gantry, a rotating rod supported by the gantry so as to be rotatable and movable in the axial direction, and a drill bit attached to the tip of the rotating rod Driving means for rotationally driving the rotating rod; moving means for moving the rotating rod in the axial direction; and a guide inserted in a hole already supported by the mount and drilled in the rock in parallel with the rotating rod. In a rock drilling device comprising a rod, provided at the tip of the gantry and supporting means for supporting the guide rod movably in the longitudinal direction thereof, provided at the tip of the gantry and in the longitudinal direction of the guide rod Holding means for holding the guide rod so that the movement of the guide rod is impossible, expansion / contraction means provided behind the guide rod on the gantry and extending / contracting along the longitudinal direction of the guide rod, and a tip of the expansion / contraction means Vignetting, the tip of the telescopic unit has a configuration in which an engaging means for disengageably engaging the rear portion of the guide rod in a state of facing the rear end of the guide rod.
Therefore, the base can be supported stably, drilling work can be performed quickly, construction efficiency can be greatly improved, and the length of the guide rod is also minimal, and the rock drilling device can be made compact. Is possible.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a rock drilling device according to the present invention.
FIG. 2 is a perspective view of a main part of the rock drilling device of the present invention.
FIG. 3 is a front view of the main part of the rock drilling device of the present invention.
FIG. 4 is a plan view of the main part of the rock drilling device of the present invention.
FIGS. 5A and 5B are perspective views showing a state where the engaging means is closed, and FIG. 5B is a perspective view showing a state where the gripping means is opened.
6 is a view taken in the direction of arrow A in FIG. 3;
7 is a cross-sectional view taken along the line BB in FIG.
FIGS. 8A to 8G are explanatory views of a drilling operation.
9A is an overall side view of a conventional drilling device, and FIG. 9B is a partially enlarged view showing the relationship between a guide rod and a drill bit in the conventional drilling device.
[Explanation of symbols]
20 Mounting base 24 Drilling bit 26 Rotating rod 28 Guide rod 40 Holding means 41 Supporting means 42 Inserting mechanism 44 Holding means 46 Retraction means R Rock mass H Split rock hole

Claims (6)

A frame,
A rotating rod supported on the frame so as to be rotatable and movable in the axial direction;
A drill bit attached to the tip of the rotating rod;
Driving means for rotationally driving the rotating rod;
Moving means for moving the rotating rod in the axial direction;
In a rock drilling device comprising a guide rod that is supported by the gantry in parallel with the rotating rod and inserted into a hole already drilled in the rock,
A support means provided at a tip of the gantry and supporting the guide rod movably in the longitudinal direction;
A holding means that is provided at a tip of the gantry and holds the guide rod so that the guide rod cannot move in the longitudinal direction;
Extending and contracting means provided behind the guide rod on the gantry and extending and contracting along the longitudinal direction of the guide rod;
An engagement means provided at the distal end of the expansion / contraction means and detachably engaged with the rear portion of the guide rod in a state where the distal end of the expansion / contraction means faces the rear end of the guide rod;
A rock drilling device characterized by the provision of 2. The rock drilling apparatus according to claim 1, wherein the gantry is provided with a retracting means for retracting the expansion / contraction means in a direction away from the rotating rod and the guide rod. The rock drilling device according to claim 1, wherein a bracket is erected at a tip of the mount, and the support means and the holding means are provided on the bracket. The expansion / contraction means includes a fluid pressure cylinder extending coaxially with the guide rod and a piston rod connected to the fluid pressure cylinder, extending coaxially with the piston rod and having a tip abutting against a rear end of the guide rod. The rock drilling device according to claim 1, wherein the rock drilling device is configured by a contact member capable of contacting. The engagement means includes a pair of openable and closable arms supported on the expansion / contraction means side and a fluid pressure cylinder that opens and closes the pair of arms, and the pair of arms holds the guide rod in a closed state. The rock drilling device according to claim 1, wherein the rock drilling device is configured to be separated from the guide rod in an open state. The retracting means includes an arm that can swing up and down with an axis supported on the gantry side as a fulcrum, and a fluid pressure cylinder that swings the arm, and the expansion and contraction means is supported by the arm. The telescopic means is disposed coaxially with the guide rod behind the guide rod when the arm is swung downward by operation, and is in the retracted position when the arm is swung upward by the operation of the fluid pressure cylinder. The rock drilling device according to claim 2.

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