JP4996357B2 - Guide bar for long drilling equipment - Google Patents

Description

  The present invention relates to a guide bar that can be installed and installed in a long hole drilling device using an extension type guide cell.

One of the auxiliary methods in mountain tunnels is a long tip receiving method (for example, long fore-piling work or long mirror bolt work) that requires a long drilling hole of about 12.5m. In the AGF method, which is one of the typical methods, construction is carried out in the situation shown in FIG. In FIG. 9, reference numeral 10 denotes a face provided with mirror-sprayed concrete having a thickness of about 10 cm.
As a work procedure, a guide cell 64 having a standard length of 5.3 m provided at the tip of a boom 62 of a drill jumbo 61, which is a heavy construction machine installed near the face 10, is usually measured by a rock drill 65 shown in FIG. Of the steel pipes 1, 2, 3, and 4 with four double pipes, only the top pipe 1 and the inner rod are set, and the first drilling and placing work is performed.
After the placement, as shown in FIG. 10, the intermediate tube 2 having a length of about 3.0 m and a weight of about 50 kg is placed on the basket 66 of the drill jumbo 1 while the position of the guide cell 64 is fixed at a high place near the face 10. A rod with a weight of about 20 kg is placed and moved upward, and after drilling the steel pipe 2 and the rod with a worker's hand, drilling and placing work is carried out. After that, after repeating the chiseling and drilling / placing work of the remaining two steel pipes 3 and 4, the bit and rod were collected when the pouring work was completed, and then the steel pipes 1, 2, 3, 4 Injecting from the inside to the ground.
Accordingly, in FIG. 9, a general one-running length is 12.5 m, a lap length is 3.5 m, and a shift length is 9 m.

As an invention that enables drilling of a predetermined length at a stretch without adding rods even for a long drilling rod, it is not a drill jumbo that is a drilling machine, but a length that is attached to the boom tip of a backhoe or truck crane. There is a shaving device (see Patent Document 1).
The long hole drilling device of Patent Document 1 is engaged with a first guide cell provided for a gantry of a main body and a chain provided along the longitudinal direction of the first guide cell. A second feed cell that is provided separately from the second guide cell that can be moved forward and backward by a feed motor and the first feed motor that meshes with a chain that is provided along the longitudinal direction of the second guide cell. A drilling machine main body that moves forward and backward by a motor, and the second guide cell is configured to extend rearward from the rear end of the first guide cell by the first feed motor when the second guide cell is moved backward. The drilling machine main body can be retracted by the second feed motor independently of the guide cell retracting operation.
Japanese Patent No. 2922142

However, with the AGF method described above, the steel pipe and rod chiseling work with a double pipe, which is a heavy object at a high place near the face, is performed three times before one drilling with a long drilling hole of about 12.5 m is performed. Since it is indispensable, 1) a lot of time and labor is required for drilling and placing, resulting in poor work efficiency and high cost. 2) A basket that is lifted near the face and in the sky during flea splicing work. There is a problem that a heavy work such as a steel pipe and an inner rod is manually lifted and set on a guide cell in a narrow work space at a high position inside.
As a means to solve this, in addition to drill jumbo used for drilling and placing rock bolts or drilling holes for blasting holes, which are indispensable as support for mountain tunnels when carrying out auxiliary construction methods, dedicated heavy machinery for carrying out auxiliary construction methods (For example, a heavy machine for the Trevi tube method) needs to be prepared separately, but there is a disadvantage that the cost is increased.

  In addition, the long hole drilling device of Patent Document 1 is attached to the tip of a boom of a backhoe or truck crane different from the drill jumbo, and the guide cell is constituted by an extension mechanism by a two-stage motor-driven chain mechanism. is there. Therefore, it is necessary to equip two motors for driving the guide cell to extend, which increases the cost.

Therefore, it is desired that a long drilling device using a stretching type guide cell can be mounted on a drill jumbo without requiring a separate drive source.
And, in a long drilling device using a stretching type guide cell, when stretching or drilling a steel pipe in the stretched state, the expansion and contraction that supports the leading pipe so that it does not deform (bend) in the direction of gravity. A possible guide bar is required.
However, since the guide cell mounted on a normal drill jumbo is not an extension method, a new extendable / retractable guide bar that can be incorporated into the long hole drilling device is required.

  The object of the present invention is to reduce the weight as much as possible and to smoothly extend and retract the guide bar so as not to limit the use of the long drilling device, and to newly add an additional drive source for extending and retracting the guide bar It is to provide a mechanism that is not required.

  In order to solve the above problems, the invention according to claim 1 is an assembly of an outer tube, an extension cylinder assembled to the outer tube, an inner tube assembled to the extension cylinder, and the inner tube. For a long hole drilling device comprising: a guide rail assembled so as to be capable of moving forward and backward along the guide rail; and a drifter assembled so as to be able to move forward and backward along the guide cell. A guide bar for guiding a drill rod connected to the inner tube, and is assembled in the inner tube so as to be extendable and contractible.

  The invention according to claim 2 is the guide bar for the long hole drilling device according to claim 1, wherein the long hole drilling device is configured such that the outer tube incorporating the extension cylinder and the inner tube is the drill. The extension cylinder is attached to the tip of the boom of the jumbo, and the extension cylinder expands and contracts when hydraulic oil is supplied and discharged from the drill jumbo. The extension cylinder extends and contracts when the hydraulic oil is supplied and discharged from the drill jumbo. The lifter moves backward and moves forward and backward along the guide cell by supplying and discharging the hydraulic oil from the drill jumbo, and the guide bar extends and retracts with respect to the inner tube.

  The invention according to claim 3 is the guide bar for the long hole drilling device according to claim 1 or 2, further comprising a drop prevention member for preventing the guide bar from falling off from the inner tube. It is characterized by.

  The invention according to claim 4 is the guide bar for the long hole drilling device according to any one of claims 1 to 3, wherein the wiper member is for cleaning dirt against the guide bar in the tip of the inner tube. It is characterized by having installed.

  The invention according to claim 5 is the long drilling device guide bar according to any one of claims 1 to 4, wherein the guide bar has side plates on both sides, and the upper surface is open. On the other hand, the bottom surface is formed of an oblique material installed obliquely between the side plates so as to increase the rigidity and reduce the weight.

  According to the present invention, it is possible to reduce the weight as much as possible as a guide bar expansion / contraction mechanism for a long hole drilling device, without restricting the use of the long hole drilling device, and to smoothly extend and contract the guide bar. In addition, an additional driving source for extending and retracting the guide bar is not required.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a configuration of an embodiment of a long hole drilling device. As described above, 1, 2, 3, 4 are steel pipes (double pipes), 10 is a face, 11 is a drill jumbo, 21 Is an extension cylinder, 22 is an outer tube, 23 is an inner tube, 31 is a guide rail, 32 is a guide cell, 33 is a drifter, 41 is a fulcrum pulley, 42 is a front pulley, and 45 is a rear pulley.

  In this embodiment, in order to improve work efficiency, reduce costs, and improve safety, the long steel pipes 1, 2, 3, and 4 of about 12.5 m are used at high places by using a drill jumbo 11 that is a general-purpose machine. Constructs a long drilling device with a length of about 6m when retracted that incorporates an extension mechanism that enables drilling and placement without chiseling.

  The drill jumbo 11 is provided with a long hole drilling device at the tip of the boom 12. As shown in the figure, this long hole drilling device includes an extension cylinder 21, an outer tube 22, an inner tube 23, a guide rail 31, a guide cell 32, a drifter 33, a fulcrum pulley 41, a front pulley 42, a front wire 43, and a rear pulley 45. And a rear wire (not shown).

The outer tube 22 is mounted on the drill jumbo 11, and the extension cylinder 21 incorporated in the outer tube 22 expands and contracts by supplying and discharging hydraulic oil from a hydraulic source (not shown) for swinging the boom 12 by hydraulic pressure. It operates, and hydraulic piping (not shown) is connected from a hydraulic source.
The inner tube 23 extends and contracts forward in connection with the extension cylinder 21, and a guide bar 25 extending further forward is assembled in the inner tube 23 so as to extend and contract. A rod guide 26 is provided at the tip of the guide bar 25.

And the guide rail 31 is assembled | attached on the inner tube 23 so that the outer tube 22 may not be contacted. Further, a guide cell 32 is assembled on the guide rail 31 so as to be movable forward and backward along the guide rail 31.
A drifter 33 is assembled on the guide cell 32 so as to be movable forward and backward along the guide cell 32. The drifter 33 includes a drilling rod 34 that extends forward, and a bit 35 at the tip thereof. As is known, the drifter 33 is moved forward and backward by air pressure, hydraulic pressure or electric power through a pipe from a driving source mounted on the drill jumbo 11 and generates rotation and striking force of the drilling rod 34.

Further, fulcrum pulleys 41 are provided on the left and right side surfaces of the outer tube 22, respectively. Specifically, a fulcrum pulley 41 is attached to the front side portion of the side surface of the outer tube 22. This fulcrum pulley 41 is a coaxial double pulley.
A front pulley 42 is provided on each of the left and right side surfaces of the inner tube 23. Specifically, a front pulley 42 is attached to the front end portion of the side surface of the inner tube 23. The front pulley 42 is a coaxial double pulley.

  As shown in FIG. 3, a front wire 43 is stretched over the fulcrum pulley 41 and the front pulley 42 described above. That is, the front wire 43 is constructed between the front end portion of the outer tube 22 and the rear end portion of the guide cell 32, and as shown in FIG. 4, for example, the inner pulley of the fulcrum pulley 41 that is a double pulley. And four pulleys on the left and right sides of the front pulley 42.

Similarly, rear pulleys 45 are provided on the left and right side surfaces of the inner tube 23, respectively. Specifically, a rear pulley 45 is attached to the rear end portion of the side surface of the inner tube 23. The rear pulley 45 is a coaxial double pulley.
A rear wire (not shown) is bridged between the rear pulley 45 and the fulcrum pulley 41 described above. That is, the rear wire, like the front wire 43, is installed between the outer tube 22 and the front end portion of the guide cell 32. For example, an outer pulley of the fulcrum pulley 41 that is a double pulley and a rear pulley 45 that is a double pulley. There are four on each side.

FIG. 2 shows a work flow in the AGF method.
First, as shown in FIG. 2A, a long hole drilling device is incorporated into the tip of the boom 12 of the drill jumbo 11. That is, the outer tube 22 is attached and fixed to the tip of the boom 12 of the drill jumbo 11.
Then, as shown in FIG. 2 (b), the long drilling device is extended by holding the guide cell 32 in the retracted position, and the steel pipes 1, 2, 3, and 4 are preliminarily assembled. At this time, the drilling rod 34 penetrates through the steel pipes 1, 2, 3, 4, and the leading pipe 1 is supported by the rod guide 26.
Thereafter, by drilling the boom 12 of the drill jumbo 11, continuous drilling of the face 10 is started as shown in FIG.

  3 is an enlarged view of the long hole drilling device of FIG. 1, FIG. 3 (a) shows a state in which the guide cell 32 is in the retracted position, and FIG. 3 (b) shows that the guide cell 32 moves forward. The state in the position is shown.

4 shows the operation of the fulcrum pulley 41, the front pulley 42, and the front wire 43 of FIG. 3. FIG. 4 (a) shows a state in which the guide cell 32 is in the retracted position, and FIG. A state in which the guide cell 32 is in the forward movement position is shown.
That is, the supply of hydraulic oil to the extension cylinder 21 causes the front pulley 42 to move forward as shown in FIGS. 4A to 4B as the inner tube 23 moves forward.

Here, since the front pulley 42 is a double pulley, the guide cell 32 moves forward with respect to the outer tube 22 via the guide rail 31 by the front wire 43 hung by four including the fulcrum pulley 41. The advance distance of the guide cell 32 is four times the advance distance of the inner tube 23. Therefore, when the inner tube 23 moves forward by 2 m, the guide cell 32 moves forward by 8 m.
Then, when the drifter 33 moves forward on the guide cell 32 by 5 m, a drilling hole having a maximum length of 13 m is possible.

  The guide cell 32 is retracted on the same principle as the forward movement by four rear wires (not shown) hung on the fulcrum pulley 41 and the rear pulley 45 formed of a double pulley.

By using the above long hole drilling apparatus, as shown in FIG. 2, the steel pipes 1, 2, 3, 4 and the inner rod are pre-assembled on the guide cell 32 previously extended to 12.5 m or more. It becomes possible.
Therefore, 1) Reduction of cycle time by shortening drilling and placing time, 2) The use of single long steel pipes 1, 2, 3 and 4 makes it possible to use consumable parts such as steel pipe joint thread costs. 3) Reduction of work close to the working face and improvement of safety due to the elimination of work at high places are expected.

Further, as shown in FIG. 5, the long boring device is shortened to about 6 m in length of the guide cell 32, whereby the posture of the boom 12 of the drill jumbo 11 is controlled not only in the horizontal direction but also in the vertical direction. Can be placed.
That is, since the long hole drilling device is accommodated in the cross section of the tunnel, the characteristics of the drill jumbo 11 as a general-purpose machine can be utilized. Furthermore, no problem arises during transportation using a dump truck (not shown) when the long hole drilling device is installed and removed from the drill jumbo 11.

  In addition, the long hole drilling device is made as light as possible, can be attached to and detached from the tip of the boom 12 of a general drill jumbo 11, and is driven by a hydraulic type supplied from the drill jumbo 11. There is nothing special to prepare in order to activate the hole device.

Next, FIG. 6 shows a configuration of an embodiment of a telescopic mechanism of a guide bar for a long hole drilling device to which the present invention is applied. FIG. 6 (a) shows a contracted state of the guide bar 25, and FIG. (B) has shown the extending | stretching state of the guide bar 25, and 36 is a rod guide.
FIG. 7 shows the relationship between the guide bar 25 and the outer tube 22 and the inner tube 23 in a longitudinal front view. Reference numerals 27 and 28 denote a drop-off prevention plate (fall-off prevention member), 29 a bush, 51 a wiper rubber ( Wiper member).

  In the above, the rod guide 26 at the tip of the guide bar 25 assembled in the inner tube 23 so as to be extendable and contracted, and the rod guide 36 attached at the tip of the guide cell 32 of the long hole drilling device are not shown. As shown in FIG. 6B, the entire guide bar 25 is moved from the inner tube 23 together with the advancement of the guide cell 32 of the long hole drilling device by the hydraulic pressure of the drill jumbo 11 described above. Pull forward and stretch.

  In this extending operation, a drop-off prevention member, for example, a drop-off prevention plate 27 is fixedly disposed on the inner bottom surface of the distal end portion of the inner tube 23 so that the guide bar 25 does not come out of the inner tube 23 and drop off. A drop-off prevention member, for example, a drop-off prevention plate 28 is fixedly arranged on the bottom surface of the rear end portion of the guide bar 25. That is, the drop-off prevention plate 28 on the bottom end of the guide bar 25 hits the drop-off prevention plate 27 on the inner bottom surface of the inner tube 23 immediately before the guide bar 25 is pulled forward from the inner tube 23 and completely comes out. Thus, the guide bar 25 is prevented from falling off.

  Further, the guide bar 25 is entirely contracted and accommodated in the inner tube 23 in accordance with the backward movement of the guide cell 32 of the long hole drilling device by the hydraulic pressure of the drill jumbo 11 on the same principle as in the above-described stretching. A bush 29 for smoothing the sliding operation of the inner tube 23 is provided on the bottom surface and the ceiling surface in the outer tube 22.

  At the time of this contraction operation, the tip of the inner tube 23 is prevented so that the sliding mechanism in the inner tube 23 is not hindered by friction caused by dirt such as dust in the muddy water supplied to the drilling hole attached to the guide bar 25. A wiper member for cleaning dirt, for example, a wiper rubber 51 attached to the guide bar 25 is installed inside the unit.

Next, FIG. 8 is an enlarged view of the guide bar 25 of FIG. 6, 52 is a side plate, and 53 is a diagonal member.
That is, as shown in FIGS. 8 (a) and 8 (b), in order not to limit the use of the long hole drilling device, the upper surface is opened for the purpose of reducing the rigidity and weight of the guide bar 25, In order to suppress vertical deformation, a plate structure, that is, a side plate 52 is adopted on the side surface. However, if the entire bottom surface has a plate structure in order to suppress horizontal deformation, dirt such as dust, sewage, and oil accumulates on the top, so that as much space as possible can be created to reduce rigidity and weight between the side plates 52. A structure in which the diagonal members 53 are put in a zigzag manner is constructed.

  As described above, the guide bar 25 that guides the drilling rod 34 connected to the drifter 33 is assembled in the inner tube 23 of the long drilling device so as to be extendable and contractible. The use of the long hole drilling device is not limited. Moreover, the guide bar 25 can be smoothly expanded and contracted, and an additional drive source for extending and contracting the guide bar 25 is not required.

1 shows the configuration of an embodiment of a long drilling device, an overall side view (a) showing a drilling start state mounted on a drill jumbo, and a partial side view showing a drilling end state of the long drilling device FIG. The work flow in the AGF construction method is shown, and a schematic side view (a) showing the incorporation of the long hole drilling device with respect to the boom tip of the drill jumbo of FIG. 1 and the steel pipe are pre-assembled by extending the guide cell. They are the schematic side view (b) which showed the state, and the schematic side view (c) which showed the start state of the continuous drilling with respect to a face. FIG. 2 is an enlarged view of the long hole drilling device of FIG. 1, and a side view (a) showing a state in which the guide cell is in a retracted position and a side view (b) showing a state in which the guide cell is in an advanced position. It is. FIG. 4A and FIG. 4B illustrate the operation of the pulley and the wire in FIG. 3, and are an explanatory diagram (a) showing a state where the guide cell is in the retracted position and an explanatory diagram (b) showing a state where the guide cell is in the advanced position. It is the whole side view which showed the vertical rock bolt driving | running state (guide cell shortened state) by a drill jumbo. The side view which showed the structure of one Embodiment of the expansion-contraction mechanism of the guide bar for long hole drilling apparatuses which applied this invention, the side view which showed the guide bar contraction state, and (a) (B). It is the vertical front view which showed the relationship between the guide bar of FIG. 6, an outer tube, and an inner tube. It is the side view (a) which expanded the guide bar of FIG. 6, the top view (b), and the end elevation (c). It is the figure which showed notion by the conventional AGF construction method notionally. It is the figure which showed the chisel joint situation of the conventional AGF construction method.

Explanation of symbols

1, 2, 3, 4 Steel pipe (double pipe)
DESCRIPTION OF SYMBOLS 10 Face 11 Drill jumbo 12 Boom 21 Extension cylinder 22 Outer tube 23 Inner tube 25 Guide bar 26 Rod guide 27 Fall-off prevention member 28 Fall-off prevention member 29 Bush 31 Guide rail 32 Guide cell 33 Drifter 34 Drilling rod 35 Bit 36 Rod guide 41 Support pulley (double pulley)
42 Front pulley (double pulley)
43 Front wire 45 Rear pulley (double pulley)
51 Wiper member 52 Side plate 53 Diagonal material

Claims (5)

The outer tube, the extension cylinder assembled to the outer tube, the inner tube assembled to the extension cylinder, the guide rail assembled to the inner tube, and the guide tube assembled to the guide tube so as to be movable forward and backward. A guide bar for guiding a drilling rod connected to the drifter, for a long drilling device comprising a guide cell and a drifter assembled so as to be capable of moving forward and backward along the guide cell,
A guide bar for a long hole drilling device, wherein the guide bar is assembled in the inner tube so as to extend and contract. In the long hole drilling device, the outer tube incorporating the extension cylinder and the inner tube is assembled at the tip of the boom of the drill jumbo, and the extension cylinder expands and contracts by supplying and discharging hydraulic oil from the drill jumbo,
The guide cell moves forward and backward by extending and retracting the extension cylinder by supplying and discharging hydraulic oil from the drill jumbo, and the drifter moves forward and backward along the guide cell by supplying and discharging hydraulic oil from the drill jumbo. The guide bar for the long hole drilling device according to claim 1, wherein the guide bar extends and contracts with respect to the inner tube.   The guide bar for a long hole drilling device according to claim 1 or 2, further comprising a drop-off preventing member that prevents the guide bar from dropping out of the inner tube.   The long drilling device guide bar according to any one of claims 1 to 3, wherein a wiper member for cleaning dirt with respect to the guide bar is installed in a tip portion of the inner tube.   The guide bar has side plates on both sides, the upper surface is opened, and the bottom surface is formed of a diagonal material constructed obliquely between the side plates to increase rigidity and reduce weight. The long drilling device guide bar according to claim 1, wherein the guide bar is a long drilling device.

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