JP5697025B2 - Drilling device for hole for embedding electrode material - Google Patents

Description

  The present invention relates to a method for grounding work such as a steel tower to which a transformer, a lightning arrester, a high-voltage device and the like are attached, and a utility pole, and a drilling device suitable for use in drilling a hole for burying a grounding member.

  In order to prevent accidents due to electrical leakage, grounding work is required by law for power poles equipped with transformers, lightning arresters, and high-voltage equipment. This grounding work is performed by embedding a grounding member to be a grounding electrode at a predetermined depth at a position away from the power pole and connecting a grounding wire to the grounding electrode.

  Conventionally, in this earthing electrode embedding work, a grounding member such as a metal rod is driven into the ground with a hammer, and after the soil is solidified, a chemical for improving conductivity is poured. And when the electrical resistance value of the embedded ground electrode was measured and a prescribed resistance value was obtained, the result was acceptable.

  However, the method of directly driving the grounding member as described above has a problem that the grounding member needs to have a considerable strength and cannot be driven if there is a hard object such as a stone in the ground.

  Also, with such a method, it is difficult to increase the driving depth, so that the prescribed resistance value is often not obtained. If the specified electrical resistance value cannot be obtained by one embedding, the grounding electrode must be repeatedly embedded at a position spaced apart by a certain distance (1 to 1.5 m) until the resistance value is obtained. Therefore, in addition to requiring a lot of labor and time, the grounding location is located away from the steel towers, utility poles, etc., causing land problems.

  In order to improve the above-mentioned conventional problems, for example, as shown in the following patent document, a method for previously filling a hole for embedding a ground electrode material, inserting the ground electrode material into this hole, and filling the filler is proposed. ing. However, since there is no drilling device that can efficiently drill such a hole for burying the ground electrode material, the practical application has not progressed. Therefore, the present inventor has developed and actually used an apparatus shown in Patent Document 2 below as an apparatus suitable for drilling a hole for embedding such a ground electrode material. As this type of drilling bit, a bit as shown in Patent Document 3 has been developed.

JP 61-165975 A Japanese Patent No. 3032856 JP 2002-349172 A

    The device disclosed in Patent Document 2 is excellent in that a desired hole can be efficiently drilled with low noise. For example, a drilled hole in a crushing zone is easily broken. In many cases, the soil was clogged, making it impossible to drill holes.

  This invention is made | formed in view of such a situation, and it aims at providing the construction method and apparatus which can drill the hole which embeds a ground electrode material efficiently also in a crushing zone.

  In order to solve the above problems, the present invention employs the following configuration. That is, the method for drilling the electrode material embedding hole according to the present invention includes a striking cylinder and a piston inside the outer cylinder, the rear end portion of which is connected to the front end portion of the drill rod, and the hole progresses as the drill progresses. This is a method of drilling a hole for embedding an electrode material using an air-driven striking device that enters inside and a drill bit that is attached to the tip of the striking device and is struck by the piston. In addition, by supplying air mixed with neutral detergent to the striking device through the through hole of the drilling rod, the fine dust generated by the drilling hole is captured and discharged by bubbles, and the hole wall tends to collapse. Under drilling conditions, slurry containing quick lime is poured into the hole, carbon dioxide gas is mixed into the air and supplied into the hole, so that the lime adhered to the hole wall is solidified and the hole wall is reinforced. Features .

  In addition, an electrode material embedding hole drilling device according to the present invention is supported by a boom provided on a carriage provided with a traveling device and capable of moving back and forth by the boom. A guide cell having a predetermined length, a rotation motor attached to the guide cell so as to be movable back and forth, a feed device for moving the rotation motor forward and backward, and attached to the tip of the rotation motor A drill rod, a swivel device for supplying fluid to a through-hole provided in a core portion of the drill rod, a striking cylinder and a piston inside an outer cylinder, and a rear end portion of the drill rod An air-driven striking device connected to the front end of the striking device, and a drill hole that has a head with an outer diameter larger than the outer cylinder of the striking device and is attached to the front end of the striking device and is struck by the piston Bits and holes drilled through the swivel device A compressor for supplying air to the through hole of the head, is characterized by comprising: a carbon dioxide gas cylinder for the incorporation of carbon dioxide in the air, and a detergent tank for mixing the detergent into the air. It is practically preferable that the carriage is equipped with a carbon dioxide cylinder, a detergent tank, and a high-pressure pump for feeding the detergent in the detergent tank.

  Further, the drill bit includes a bit main body having a hard blade at the head and a shank portion that detachably holds the bit main body, and the bit main body rotates in the direction of drilling the shank portion. It is preferable to use one that is configured to be able to deviate from the shank portion by being reversed in the opposite direction.

  Since this drilling device is provided with a traveling device, it can be easily moved to any place. Since the striking device for striking the perforated bit is fitted into the hole, noise is less generated.

  A slurry containing quick lime (sometimes called “lime milk”) can be poured into the drilled holes, and a carbon dioxide gas cylinder is provided as a means for blowing carbon dioxide gas. Can be injected. By this operation, a slurry containing lime is attached to the inner wall of the hole and then solidified by carbon dioxide gas, and the collapse of the hole wall can be effectively prevented. Furthermore, since neutral detergent can be injected into the hole, fine dust generated by hitting the bit can be captured and discharged in the bubbles by the neutral detergent, and the fine powder is sprayed to the outside. Scattering can be suppressed.

  In addition, if a bit that can separate the head and shank by reverse rotation is used as the drill bit, even if the earth and sand are clogged in the outer periphery of the large-diameter head of the bit, By separating the head by rotating the rod in the reverse direction, it is economical because an expensive striking device or the like can be pulled out and collected from the hole, leaving only the head at the bottom of the hole. For this purpose, unlike the one described in Patent Document 3, the outer periphery of the body portion does not have an opening, and the body portion having no opening does not enter the inside, so the reverse rotation occurs. Is easy and preferable.

It is a side view of the drilling device showing one Example of this invention. It is a front view of the principal part. It is sectional drawing of a striking device. It is an expanded sectional view of the principal part. It is an expanded sectional view of the principal part. It is explanatory drawing of a grounding member embedment state. It is an external view of a drill bit. It is a partial sectional view of a drill bit. It is an external view of the bit body It is AA sectional drawing (refer FIG. 8) showing a drilling state. It is a longitudinal cross-sectional view showing the relationship in the relative rotation of a bit main body and a fitting recessed part.

  Hereinafter, embodiments of the present invention will be specifically described. FIG. 1 shows one embodiment of a drilling device for embedding a grounding member according to the present invention. This drilling device 1 is a rotatable boom 4 of a carriage 3 having a crawler type traveling device 2. A rotating hydraulic motor 6 is supported on the guide cell 5 attached to the movably back and forth (up and down in the figure). The guide cell 5 is provided with a feed hydraulic motor 7 which is a feed device for driving the rotating hydraulic motor 6 back and forth, and a feed chain 9 which is fed in the forward and reverse directions by the motor. The rotating motor 6 is attached to a carriage plate 8 attached to the chain. 2, 11 is a hydraulic cylinder that moves the guide cell 5 back and forth (up and down in the standing state), and 12 is a hydraulic cylinder that tilts the standing guide cell 5 left and right.

  A drill rod 15 is connected to the rotating shaft of the rotating motor 6 by a coupling sleeve. A down-the-hole striking device 20 is connected to the tip of the drill rod 15 with a screw. FIG. 3 is a cross-sectional view of the striking device, in which a threaded back head 22 is screwed onto the rear end portion of the wear sleeve 23 forming an outer cylinder, and a striking cylinder 25 is placed in the wear sleeve (outer cylinder). Is provided.

  A piston 24 that also serves as a sliding valve is slidably fitted inside the cylinder 25. Further, a bit holding portion is provided at the distal end portion of the wear sleeve 23, and a drill bit 30 having a cemented carbide chip implanted at the distal end is attached to a chuck 26 provided at this portion. The striking device 20 is connected to the drill rod 15 by the threaded portion of the back head 22. In the figure, 27 is a distributor fitted in a hole provided in the core of the piston, 28 is a check valve, and 31 is a retainer. The air supplied through the bore rod flows from the air passage 35, depresses the check valve 28, passes between the distributor 27 and the wear sleeve 23 and the cylinder 25, and the operating chamber 36. Flows in. This air is sent from the operating chamber 36 to the front chamber 37 and the rear chamber 38, respectively, and a striking cycle is performed.

  Before the landing of the bit 30, the bit and the piston 24 are lowered to the lowermost portion, and air is discharged from the blow port 40 of the cylinder 25 through the inside of the piston and from the tip of the bit. When the bit is landed by the lowering of the striking device 20, the bit is pushed up until it hits the shoulder of the chuck 26, and the high-pressure air of the operating chamber 36 passes through the longitudinal groove 24a of the piston and the undercut 23a of the wear sleeve 23, It flows into the front chamber 37. This air pressure causes the piston to rise rapidly (see FIG. 4). The inflow port to the front chamber 37 is closed and the inflow of air stops, but the piston continues to rise due to the expansion and inertial force of the air in the chamber.

  As the piston 24 moves up, the air in the rear chamber 38 is compressed, and the high-pressure air in the operating chamber 36 flows into the rear chamber 38 through the cylinder and piston undercuts 25a and 24a (see FIG. 5). . The pressure in the rear chamber stops the piston from rising, and the striking energy is stored. At this time, the air in the front chamber 37 is exhausted through the bit.

  Due to the expansion of the air in the rear chamber 38, the piston rapidly descends and strikes the bit. When the piston is removed from the distributor 27 by this lowering, the air in the rear chamber passes through the piston and is discharged from the bit. After hitting the bit, the piston bounces slightly and air again flows into the front chamber and the next cycle begins.

  The carriage 3 has a built-in hydraulic device, and the traveling device 2, the boom, the hydraulic motor, the hydraulic cylinder and the like are driven by the hydraulic pressure from the hydraulic device. The striking device is driven by air supplied from a separate compressor 32.

  Further, as shown in FIG. 1, the carriage 3 is equipped with a carbon dioxide cylinder B as a carbon dioxide supply means, a liquid tank T, and a high-pressure pump P, which are connected to the swivel S by a hose, The swivel S is supplied to the drill bit through the through hole in the drill rod 15. A separate mixing tank is provided in front of the swivel, and the carbon dioxide gas from the carbon dioxide cylinder B and the liquid (water or surfactant solution) from the liquid tank T are mixed in this mixing tank and then supplied to the swivel device. You may make it do.

  Next, the drill bit 30 is configured in a divided manner as shown in FIGS. This drilling bit 30 is a bit that is used by being attached to a down-the-hole drilling device (drill). The head and the shank part, which are originally formed integrally, are formed separately and integrated. To do. That is, the drilling bit 30 includes a bit body 50 and a shank portion 60. The bit body 50 includes a head portion 51 and a fitting shaft portion 52 integral with the head portion. The head 51 has an outer diameter larger than that of the drilling device pipe (wear sleeve) 23, and a plurality of hard blades 53,. Are provided with a plurality of pulverized grooves 54 in the front-rear direction. The rear end surface 51a of the head 51 is a plane perpendicular to the axial direction.

  The fitting shaft portion 52 of the bit body has an outer diameter smaller than that of the head portion, and a pair of lugs (claws) 57 and 57 project from the front and rear intermediate portions. The lug 57 has an outer peripheral portion formed as an arc-shaped surface having a predetermined length, and both front and rear end portions in the longitudinal direction are formed as inclined surfaces extending in the base portion. In the illustrated example, only one pair of lugs is provided in the diameter direction of the fitting shaft portion 52, but three or more lugs may be provided. The axial center of the bit body 50 is provided with a through hole 55 for air circulation, and is provided with discharge holes 56 and 56 that branch from the bottom of the through hole and open to the head end face and the flouring groove 54. ing.

  The shank portion 60 is provided with a fitting cylinder portion 61 into which the fitting shaft portion 52 is fitted at the front end, and a rod-like portion 62 at the rear portion. Since no opening is provided in the outer peripheral portion of the fitting cylinder portion 61, earth and sand do not enter the inside, and the drilling operation can be performed smoothly. A through hole 63 for air circulation is provided in the shaft center portion of the shank portion 60. A concave portion 65 into which the lug 57 is fitted is formed in the hollow portion 64 of the fitting cylinder portion 61. The recess 65 includes rotation transmission planes 65a and 65a with which one side surface of the lug abuts when the drill bit 30 as a drilling tool normally rotates, and a separation plane 66a with which the other side surface abuts when rotating in the reverse direction. , 66a. The angle between the two planes 65a and 66a is an angle at which the bit does not come off during drilling, and is 45 degrees in the illustrated example, but is not limited thereto.

  The front end portion of the fitting tube portion 61 has a ring-shaped flat surface 67 having a predetermined width, a funnel-like portion 68 inside thereof, and the fitting shaft portion 52 and lugs 57 and 57 of the bit body inserted into the concave portion 65 from the front side. An insertion opening 69 that can be used is provided.

  A spline portion 70 is provided on the rod-shaped portion 62 of the shank portion 60. A notch 71 in the circumferential direction is provided at the rear part of the spline part 70, and the spline part 70 is divided into a front part 70a and a rear part 70b by the notch part. A retainer ring (protrusion) for preventing the shank portion from coming out of the chuck portion of the drilling device is fitted into the notch portion 71.

  As shown in FIG. 1, the drill bit 30 is used by being attached to a front end portion of a pipe (wear sleeve) of a striking device (drill device) 20. The drill device 20 is a well-known down-the-hole drill device. A piston is held in a cylinder part provided inside the wear sleeve so as to be movable back and forth, and high-pressure air is switched and supplied to a front chamber and a rear chamber on the front side of the piston. Thus, the piston moves back and forth, and hits the rear end face of the shank of the drill bit 30 when moving forward. The switching supply of the high-pressure air is performed by a valve provided behind the piston and an air passage provided in the inner wall portion of the wear sleeve.

  When drilling a pilot hole for burying the grounding member using this drilling device, the carriage 3 is moved to a desired position, and the guide cell 5 that can be erected and overturned is erected, and the leg 5a at the lower end thereof is moved. Ground and fix. When the drill bit 30 is pressed against the ground by the feed motor 7 while rotating and hitting the drill bit 30 in this state, drilling is performed. The air for driving the impacting device is fed from the compressor 32 through a through hole provided in the hole rod 15. In the drill hole, the air that has driven the piston of the striking device 20 is discharged from the blow hole of the drill bit 30 to discharge the dust in the hole and cool the bit.

  In the drilling, it is preferable to mix a neutral detergent into the air and blow it in. If it does in this way, since the fine pulverized powder grind | pulverized by the drill bit 30 will be captured in the foam | bubble of neutral detergent, and will be discharged | emitted out of a hole, the deterioration of the working environment by dust can be prevented.

  In addition, when the drill bit 30 reaches the crush zone, and when the hole wall is likely to collapse, a liquid (slurry) containing lime such as lime milk or cement milk is put in the hole in the drill hole. In addition to injecting, carbon dioxide may be mixed with air and blown. The liquid containing lime can be easily obtained by pouring from the hole using a bucket or the like. The lime-containing liquid adheres to the hole walls in the drill holes and reacts with the carbon dioxide gas to solidify, so that the hole walls are reinforced and collapse is less likely to occur.

  The drilling depth is usually about 4.5 m, but if this drilling device is used, a maximum of about 15 m can be drilled. In this case, drilling is performed while joining a plurality of drilling rods. The diameter of the lower hole is, for example, 66 mm.

  In actual drilling, a hollow drilling rod 15 is connected to the rear part of the striking device, the rotational force of an external rotating device is applied to the rod, and high-pressure air is supplied through the hollow part of the rod. Done. The rotational force of the rod 15 is transmitted from the wear sleeve 23 of the drill device to the shank portion of the drill bit 30 through spline fitting, and rotates the bit head. Further, the high-pressure air supplied through the rod 15 operates the valve and piston constituting the striking device to strike the drill bit 30 and discharge holes that open to the bit body head of the drill bit 30. (Blow holes) 56, 56, and the dust produced by hitting by the hard blades 53,... Of the bit head is discharged rearward through the gap between the outer periphery of the wear sleeve and the inner wall of the hole.

  In the hole, the striking force of the piston is transmitted to the rear end surface of the shank portion, and is transmitted from the ring-shaped plane of the shank portion to the head rear end surface of the bit body. In this drilling hole, the drilling bit 30 is rotated in the normal direction (left rotation as viewed from the rear), so that the lug 57 of the bit body rotates the recess 65 of the fitting cylinder part 64 in the same manner as a conventionally known bit. The rotational force is transmitted to the bit body in contact with the force transmission plane 65a. In this state, the lug 57 engages with the inner wall surface (stopper surface) 65c on the front side of the recess 65, so that the bit body 50 does not deviate from the shank portion 60.

  When the hole having the desired depth is drilled, the feed rod 7 and the striking device 20 are pulled up from the hole by reversing the feed motor 7 and the hole drilled on the side of the utility pole 45 as shown in FIG. A grounding member (for example, a grounding rod having a diameter of 10 mm) 46 is inserted. As the grounding member, an appropriate member such as a metal rod, a plate, or a wire can be adopted. The upper end of the ground member 46 is connected to the existing ground member 46a by a conductor 46b such as a copper wire, a carbon sheet, or a copper plate. Thereafter, the filling material 47 is filled, and the top soil 48 is filled into the opening 49 (depth d is 0.75 m). Although normal soil may be used as the filler 47, it is preferable to use lime-based powder in order to improve conductivity. It is effective to mix this lime powder with topsoil. This lime-based powder is alkaline and has the effect of neutralizing acidic soil and taking in heavy metals in the ground.

  On the other hand, when the drilling device of the predetermined depth is finished and the drill device is to be collected together with the rod 15, when the earth is clogged behind the head of the bit, that is, on the upper side, the rod 15 is reversed. Give rotation. Then, since the shank portion 60 of the drill bit 30 that is spline-fitted to the drill device rotates reversely with respect to the bit body 50, the lugs 57 and 57 rotate relative to each other until they come into contact with the separation planes 66a and 66a of the recess 65, Since it comes to the position which overlaps the insertion opening part 69 of the fitting cylinder part 61, the fitting shaft part of the bit main body 50 can be detached from the fitting cylinder part of the shank part 60. When the drilling device is pulled rearward through the rod in this state, the large-diameter head 51 receives resistance against backward movement due to the inner wall of the hole or clogging, and the bit body 50 deviates from the shank portion 60. For this reason, the shank part 60, the drill device, and the rod can be recovered while the bit body 50 remains in the drilled hole bottom.

  As described above, the drill bit 30 can detach the bit body 50 which is easily caught by the large-diameter head 51 by a simple operation (reverse rotation and traction) from the outside. The rod 15 can be easily collected. Since only the bit body 50 is not collected, it is not so uneconomical. In addition, although the bit body remains in the drilled hole, it is possible to insert a reinforcing material or inject cement milk as usual, and if the depth is sufficient, bury the ground electrode material Can do. In addition, when a new drill hole is made by reusing the extracted member, a new bit body 50 may be mounted on the shank portion and drilled in the same manner as described above.

  As described above, the drilling device for grounding member embedding according to the present invention has a striking device attached to the tip of the drilling rod that transmits thrust and rotational force, and is attached to the tip of the striking device. Since the hole is drilled by the hole bit, the drilling device itself is fitted into the hole as the drilling proceeds, and noise leaking to the outside can be suppressed to a low level. The outer diameter of the drill bit is larger than the outer diameter of the striking device, and the drill bit is configured to discharge the air used for hitting. The air can be discharged to the outside together with air through the outer peripheral surface and the hole wall. For this reason, discharge of the dusting is reliable, and the discharge structure can be made simple and robust.

  Moreover, in the construction method of the present invention, quick lime slurry (lime powder milk or cement milk) mixed with lime in water can be drilled while being injected into the hole, and carbon dioxide gas can be blown together with air. There is a great advantage that clogging can be prevented even in a crushing zone that is easy to do. Of course, depending on the conditions, it is also possible to drill without performing these injections or gas blowing. In the above explanation, the drilling of the hole for embedding the electrode material has been described. However, it is obvious that this drilling method can be adopted as a drilling hole for other uses.

DESCRIPTION OF SYMBOLS 1 Drilling device 2 Traveling device 3 Car 4 Boom 5 Guide cell 6 Motor for rotation 7 Feed motor 15 Drilling rod 20 Blowing device 30 Drilling bit 45 Electric pole 44 Lower hole 46 Grounding member

Claims (2)

A boom provided on a carriage provided with a traveling device, a vertically movable boom, a guide cell having a predetermined length supported by the boom so as to be movable back and forth, and attached to the guide cell so as to be movable back and forth. The rotation motor, a feed device for moving the rotation motor forward and backward, a drill rod attached to the tip of the rotation motor, and a core portion of the drill rod. A swivel device for supplying fluid to the through-hole, an air-driven striking device having a striking cylinder and a piston inside the outer cylinder, and a rear end portion of which is connected to a front end portion of the drill rod, and the striking device A drill bit that has a head with an outer diameter larger than the outer cylinder of the device and is attached to the tip of the impact device and is struck by the piston, and air is passed through the drill rod through the swivel device. A compressor for supplying And carbon dioxide gas cylinder for the incorporation of carbon dioxide, and a detergent tank for mixing detergent to the air, the drilling bit has a bit body with a rigid blade to the head, the A shank portion that detachably holds the bit body, and the bit body is configured to be able to deviate from the shank portion by reversing the direction opposite to the rotation direction when drilling the shank portion, the outer peripheral portion to form a plural rows of Repetitive Konamizo, the 該繰powder groove in the drilling rod through hole electrode material burying hole the discharge hole and said opening to Rukoto for ejecting air supplied from the Drilling device. The hole drilling device for an electrode material embedding hole according to claim 1 , wherein the carriage is equipped with a carbon dioxide gas cylinder, a detergent tank, and a high-pressure pump for feeding the detergent in the detergent tank.

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