JP5753155B2 - Rigid rod driving device - Google Patents

Description

  The present invention is mainly intended to drive a conductive rigid rod or the like installed in the ground to an electric power station (power plant or substation), a steel tower, or a power pole to which a transformer, a lightning arrester, high voltage equipment, etc. are attached. Is related to the insertion device.

  Conventionally, grounding works such as electric power stations and utility poles are usually performed by measuring the electric resistance value by installing a rigid rod made of metal and having a length of about 1.5 m in the ground. A rigid rod is added until the specified value is reached. The addition is performed by inserting and connecting the lower end of the rigid rod to be arranged next to the cylindrical thick connecting portion provided at the upper end of the rigid rod. Such a rigid rod is formed by driving directly from above with a hammer, a tool, or the like (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 06-076908

  However, since the conventional grounding work is performed by directly driving the rigid bar with a hammer or the like from above, for example, when the ground is hard, the rigid bar is bent, and there is a big problem that the grounding work is troublesome. . In addition, the cylindrical thick connecting portion at the upper end of the rigid rod may be crushed by hammering, and the lower end of the rigid rod to be arranged next may not be connected.

  The present invention has been devised in view of these problems, and an object of the present invention is to provide such a driving device that can be driven into the ground accurately and easily without bending a rigid bar such as an electric power station or a utility pole.

  Definition of terms: In this specification, a rigid rod means a steel bar that can be bent to some extent. This will be described with reference to FIGS. The rigid rod driving device 1 according to claim 1 is for driving the rigid rod B into the ground using hydraulic pressure and air pressure, and the front outer cylinder 11 and the rear where the rigid rod B is passed. The cylinder 13 and the cylinder 13 are connected and fixed to each other, the impact receiving cylinder 7 supporting the upper and lower ends concentrically in the front outer cylinder is disposed, a chuck insertion support hole 7d is provided in the middle of the impact receiving cylinder 7, and the inside is the chuck. The outer surface of the rigid rod B is opposed to the outer surface of the rigid rod B through the insertion support hole 7d, and the outer diameter of the rigid rod B is strongly gripped in the reduced diameter state, and the rigid rod B is expanded in the expanded diameter state. The chuck body 2 forming the first inclined surface 2a whose outer peripheral surface is reduced in diameter downward, and located on the outer peripheral side of the chuck main body 2, the inner peripheral surface is reduced in diameter downward, Second inclined surface 3 in contact with the first inclined surface 2a of the chuck body 2 Forming a chuck jaw 3, a front end abutting on the rear end of the chuck jaw 3, a hydraulic piston 4 that can be moved forward and backward and moved forward by hydraulic pressure, and a hydraulic pressure that supplies the hydraulic pressure by hydraulic oil And a pump device 5.

  In addition, the rigid rod driving device 1 has a rear end abutting against the front end of the chuck jaw 3 and a spring 6 that presses the chuck jaw 3 backward by elasticity, and a substantially cylindrical shape. An impact receiving cylinder 7 which is disposed close to the outer peripheral surface of the rigid rod B, the front end abuts on the rear end of the chuck body 2 and the rear end surface forms an impact surface 7a, and the rear of the impact receiving cylinder 7. A pneumatic piston 8 that is provided so as to be movable forward and backward, moves forward by air pressure, and whose front end collides with the striking surface 7a of the impact receiving cylinder 7, and an air pressure supply unit 9 that supplies the air pressure by compressed air With.

  The rigid rod driving device 1 according to claim 2 is for driving the rigid rod B into the ground using hydraulic pressure and air pressure, and the front outer cylinder 11 and the rear where the rigid rod B is passed. The cylinder 13 is connected and fixed to each other, the impact receiving cylinder 7 supporting the upper and lower ends concentrically in the front outer cylinder is disposed, and the front outer cylinder 11 and the rear cylinder 13 where the rigid rod B is passed are connected to each other. The impact receiving cylinder 7 is fixed and concentrically supported at the upper and lower ends in the front outer cylinder. The impact receiving cylinder 7 has a lower end supporting portion 7f having a small diameter, an intermediate main body portion 7b having a large diameter, and an upper end neck portion 7c. The upper end neck portion 7 c is supported on the upper portion of the front outer cylinder 11, and the lower end support portion 7 f is supported on the lower end lid portion 12 of the front outer cylinder 11. A chuck insertion support hole 7d penetrating in the radial direction is provided in the middle of the impact receiving tube main body portion 7b, and two chuck main bodies each having a trapezoidal plate-like shape with a downward mountain formed of vertical sides orthogonal to two parallel sides. 2 and 2 are inserted from the left and right of the chuck insertion support hole 7d so that the vertical side is inward, facing the rigid rod B in the impact receiving cylinder 7, and can be reduced in diameter and expanded in a reduced diameter state. The chuck main body 2 that strongly grips the outer peripheral surface of the rigid rod B, opens the rigid rod B in an expanded state, and forms a first inclined surface 2a in which the outer peripheral surface is reduced in diameter downward, A chuck jaw 3 which is located on the outer peripheral side of the chuck body 2 and whose inner peripheral surface is reduced in diameter downward to form a second inclined surface 3a in contact with the first inclined surface 2a of the chuck body 2; The front end is in contact with the rear end of 3 and moves forward and backward. Mounted for comprises a hydraulic piston 4 moves forward by hydraulic pressure, and a hydraulic pump device 5 for supplying the hydraulic by hydraulic oil.

  In addition, the rigid rod driving device 1 has a rear end abutting against the front end of the chuck jaw 3 and a spring 6 that presses the chuck jaw 3 backward by elasticity, and a substantially cylindrical shape. An impact receiving cylinder 7 which is disposed close to the outer peripheral surface of the rigid rod B, the front end abuts on the rear end of the chuck body 2 and the rear end surface forms an impact surface 7a, and the rear of the impact receiving cylinder 7. A pneumatic piston 8 that is provided so as to be movable forward and backward, moves forward by air pressure, and whose front end collides with the striking surface 7a of the impact receiving cylinder 7, and an air pressure supply unit 9 that supplies the air pressure by compressed air With.

  Further, in the rigid rod driving apparatus 1, the inner peripheral surface of the chuck body 2 is provided with a locking surface 2 b that includes a plurality of concave and convex portions and engages with the outer peripheral surface of the rigid rod B.

  The rigid rod driving device 1 according to claim 1 compresses the spring 6 by the hydraulic pressure supplied from the hydraulic pump device 5, and the chuck body 2 releases the rigid rod B to freely move in the axial direction. In this state, the pneumatic piston 8 is moved forward by air pressure so as to collide with the striking surface 7a of the striking cylinder 7, so that the rigid rod B can be easily driven into the ground without bending.

  That is, the driving device 1 does not drive the rigid bar B directly from above, but drives the outer surface of the rigid rod B with the chuck body 2. For example, when the ground is hard, the driving force is reduced. It can escape by sliding between the chuck body 2 and the rigid rod B or the like. Thereby, the rigid rod B can be driven gradually without bending.

  Further, since the outer peripheral surface of the rigid rod B is gripped by the chuck body 2, the distance between the distal end of the rigid rod B and the location (outer peripheral surface) where the driving force is applied to the rigid rod B is the distance between the distal end and the upper end of the rigid rod B. It becomes shorter than the distance. Also by this, the bending of the rigid rod B can be prevented.

  Further, when the rigid rod B is driven, since the inner peripheral surface of the hitting cylinder 7 is close to the outer peripheral surface of the rigid rod B, the hit receiving cylinder 7 functions as a guide member. Also by this, the rigid rod B can be accurately driven in the vertical direction without bending.

  The rigid rod driving device 1 according to claim 2 exhibits the same effect as that of the invention according to claim 1. Further, since the impact receiving cylinder lower end support portion 7f whose inner peripheral surface is close to the outer peripheral surface of the rigid rod B is provided below the chuck body 2, the rigid rod B can be more accurately vertically aligned without being bent. You can drive in.

  Furthermore, since the inner peripheral surface of the chuck body 2 has a plurality of concave and convex portions and is a locking surface 2b that engages with the outer peripheral surface of the rigid bar B, the chuck body 2 grips the rigid bar B more firmly. be able to. Thereby, since driving force can be effectively transmitted by the rigid rod B, the said rigid rod B can be driven more reliably in the ground.

It is a front view which shows embodiment of the driving device which concerns on this invention. It is principal part sectional drawing of the driving device shown in FIG. 1 (the left half shows the state which the pneumatic piston descend | falls, and the right half shows the state which the pneumatic piston raised). FIG. 3 is a detailed explanatory diagram of the upper half of FIG. 2. FIG. 3 is a detailed explanatory diagram of the lower half of FIG. 2. It is the XX sectional view taken on the line of FIG. It is the YY sectional view taken on the line of FIG. It is a principal part schematic sectional drawing which shows the effect | action of the driving device shown in FIG.

  1 to 5 show an embodiment of a rigid rod driving device 1 according to the present invention. This device 1 is used for driving a rigid rod B into the ground using hydraulic pressure and air pressure, and includes a chuck body 2, a chuck jaw 3, a hydraulic piston 4, a hydraulic pump device 5, a spring 6, and an impact receiving cylinder 7. , A pneumatic piston 8, an air pressure supply unit 9, and a rear cylinder 13. The impact receiving cylinder 7 through which the rigid rod B is inserted includes a small-diameter lower end support portion 7 f, a large-diameter intermediate body portion 7 b, and an upper end There is a neck portion 7 c, the upper end neck portion 7 c is supported by a second liner 15 surrounded by the upper portion of the front outer cylinder 11, and the lower end support portion 7 f is supported by the lower end lid portion 12 of the front outer cylinder 11. A chuck insertion support hole 7d penetrating in the radial direction is provided in the middle of the impact receiving tube main body portion 7b, and two chuck main bodies each having a trapezoidal plate-like shape with a downward mountain formed of vertical sides orthogonal to two parallel sides. 2 and 2 are inserted from the left and right of the chuck insertion support hole 7d so that the vertical sides are inward, and face the rigid rod B in the impact receiving cylinder 7.

  The chuck body 2, the chuck jaw 3, the hydraulic piston 4, the spring 6, and the impact receiving cylinder 7 are accommodated in a substantially cylindrical front outer cylinder 11. The pneumatic piston 8 is housed in a rear cylinder 13 connected to the upper end of the front outer cylinder 11. A lid portion 12 is attached to the lower end portion of the front outer cylinder 11. A through-hole 12a for receiving a striking cylinder lower end support portion 7f through which the rigid rod B is inserted is formed at the center of the lid portion 12.

  The chuck body 2 having a T-shaped plan view can be reduced in diameter and expanded in the chuck jaw 3 having a T-shaped groove 3b provided to be inclined so as to reduce the diameter downward. In this way, the outer peripheral surface of the rigid rod B is strongly gripped, and the rigid rod B is opened in the expanded diameter state to form the first inclined surface 2a whose outer peripheral surface is reduced in diameter downward. The chuck body 2 according to the present embodiment is divided into two parts, and is prevented from rotating by two support columns 7e formed by chuck insertion support holes 7d provided in the middle of the impact receiving cylinder 7 (see FIG. 6). . In a state where no hydraulic pressure is applied to the hydraulic port 11 a, the chuck jaw 3 is raised by the elasticity of the spring 6, and the chuck body 2, whose vertical position cannot be changed with respect to the impact receiving cylinder 7, is a rigid rod by the elasticity of the spring material 6. It is set so that B is sandwiched.

  The chuck jaw 3 is positioned on the outer peripheral side of the chuck main body 2 so as to cover the chuck main body 2, and the inner peripheral surface of the chuck jaw 3 is reduced in diameter downward to come into contact with the first inclined surface 2 a of the chuck main body 2. Surface 3a is formed.

  The front end of the hydraulic piston 4 abuts on the rear end of the chuck jaw 3 and is provided so as to be movable forward and backward. The hydraulic piston 4 moves forward by hydraulic pressure. That is, a substantially lower half portion of the hydraulic piston 4 is a large diameter portion 4a, a substantially upper half portion is a small diameter small portion 4b, and the first liner 14 is fixed between the small diameter portion 4b and the front outer cylinder 11. Provided. Accordingly, a hydraulic space G to which hydraulic oil is supplied is formed between the hydraulic piston 4, the first liner 14, and the front outer cylinder 11. The hydraulic space G communicates with the hydraulic pump device 5 through a hydraulic port 11 a formed in the front outer cylinder 11.

  The hydraulic pump device 5 supplies hydraulic pressure to the hydraulic space G by the action of hydraulic oil. The configuration of the hydraulic pump device 5 is not limited, but is configured with a hydraulic jack in the present embodiment. The hydraulic pump device 5 includes an operation rod 5a for supplying hydraulic oil, a hydraulic valve 5b, and an operation handle 5c for opening and closing the hydraulic valve 5b.

  The rear end of the spring 6 comes into contact with the front end of the chuck jaw 3, and the chuck jaw 3 is pressed backward by elasticity. The type of the spring 6 is not limited, but a disc spring group is used in the present embodiment.

  The impact receiving cylinder 7 has its inner peripheral surface disposed close to the outer peripheral surface of the rigid rod B, its front end abuts on the rear end of the chuck body 2, and the rear end surface of the impact receiving cylinder 7 forms the impact surface 7a. . The impact receiving cylinder 7 is provided so as to be movable forward and backward. The impact receiving cylinder 7 is disposed on the inner peripheral side of the hydraulic piston 4 via a second liner 15 fixed to the front outer cylinder 2.

  The rear cylinder 13 is formed with a lower end large-diameter communication hole 13e, an intermediate medium-diameter valve slide hole 13d, and an upper-end large diameter piston slide hole 13c from the front to the rear, and the pneumatic piston 8 inserted into the rear cylinder 13 A lower end small diameter striking portion 8d, an intermediate medium diameter slide valve portion 8e, and an upper end large diameter piston portion 8f are formed.

  The pneumatic piston 8 is provided behind the impact receiving cylinder 7 so as to be able to move forward and backward, move forward by air pressure, and the front end collides with the impact surface 7 a of the impact receiving cylinder 7. The pneumatic piston 8 has an inner peripheral surface close to the outer peripheral surface of the rigid rod B, and a plurality of (eight in FIG. 3) pneumatic passages 8a parallel to the central axis.

  Further, a first air hole 8b is formed at the front end of the slide portion 8e of the pneumatic piston 8, and a second air hole 8c is formed slightly above. Further, a clearance space S is formed between the front end portion of the pneumatic piston 8, the rear cylinder 13, and the second liner 15 so as to communicate with the first air hole 8b when the pneumatic piston 8 is lowered.

  The rear cylinder 13 has an exhaust port 13a at a substantially front end portion thereof, and communicates the escape space S of the pneumatic piston 8 to the atmosphere through the exhaust port 13a. The rear cylinder 13 is provided with an intermediate medium diameter valve slide hole 13d. Further, a supply space M communicating with the supply port 13b and an annular supply path P continuous therewith are formed between the rear cylinder 13 and the pneumatic piston 8. The supply path P communicates with the second air hole 8c of the pneumatic piston 8 with the pneumatic cylinder raised.

  A back head 16 is attached to the upper end portion of the rear cylinder 13. An air space R is formed between the back head 16, the pneumatic piston 8, and the rear cylinder 13. The pneumatic path 8a in the pneumatic piston 8 communicates with the air space R.

  An insertion hole 16a through which the upper diameter-reduced portion 8h of the pneumatic piston 8 is inserted is formed at the center of the back head 16. A cover portion 17 is attached to the upper end portion of the back head 16. An opening 17 a through which the rigid rod B is inserted is formed at the center of the cover portion 17.

  The air pressure supply unit 9 supplies air pressure with compressed air sent from an air pump (not shown), and communicates with the supply port 13b of the rear cylinder 13 via an air pipe 9c. The pneumatic pressure supply unit 9 is provided with a pneumatic valve 9a for controlling the inflow of compressed air. The pneumatic valve 9a is opened and closed by a rotating lever 9b.

  The lower portion 7 f of the impact receiving cylinder 7 has a cylindrical shape that is also disposed below the chuck body 2, and the inner peripheral surface is close to the outer peripheral surface of the rigid rod B. A spring 6 is disposed on the outer peripheral surface of the hitting cylinder lower portion 7f.

  In the present embodiment, the inner peripheral surface of the chuck main body 2 is a locking surface 2b that has a jagged uneven portion and engages with the outer peripheral surface of the rigid rod B.

  The operation of the rigid rod driving apparatus 1 according to the present embodiment will be described (see FIGS. 2 and 5). The ground wire E of the utility pole D is connected to the rigid rod B driven by the driving device 1.

  First, when the hydraulic space G is in a low-pressure oil state, the chuck jaw 3 is raised by the spring 6, the hydraulic piston 4 is raised, the two chuck bodies 2, 2 are close to each other, and the interval through which the rigid rod B is passed is It is not kept. In this state, when high pressure oil is sent from the hydraulic pump device 5 to the hydraulic space G by switching the hydraulic valve 5b, the hydraulic piston 4 pushes down the chuck jaw 3 against the spring 6 and moves up and down with respect to the impact receiving cylinder 7. The chuck bodies 2 and 2 whose position cannot be changed move radially outward along the second inclined surface 3b with both side edges fitted in the T-shaped groove 3b, and the distance between the two chuck bodies 2 and 2 is increased. spread. In this state, the rigid rod B is inserted from the insertion hole 16 a of the back head 16, and its tip portion is protruded from the through hole 12 a of the lid portion 12.

  In this state, the hydraulic valve 5b is opened, and the hydraulic oil in the hydraulic space G is caused to flow backward to release the hydraulic pressure. As a result, the chuck jaw 3 is lifted by the action of the spring 6, and the chuck body 2 is moved inward by the action of the second inclined surface 3 a and the first inclined surface 2 a of the chuck body 2 to be in a reduced diameter state. As a result, the chuck body 2 firmly holds the rigid rod B. In addition, since the inner peripheral surface of the chuck body 2 is a jagged engagement surface 2b, the rigid bar B can be more firmly gripped by the action of the engagement surface 2b.

  From this state, the pneumatic lever 9b of the pneumatic supply unit 9 is operated to open the pneumatic valve 9a, and the compressed air supplied from the air pump is supplied to the supply space M through the supply port 13b of the rear cylinder 13. Supply. The air pressure supplied to the supply space M reaches the air space R on the rear side of the pneumatic piston 8 through the supply passage P and the second air hole 8c / air pressure passage 8a of the pneumatic piston 8, and is emptied by the air pressure. The pressure piston 8 descends, and the lower end surface of the pressure piston 8 collides with the striking surface 7 a of the striking cylinder 7.

  The impact receiving cylinder 7 is lowered by this collision, and the impact receiving cylinder 7 lowers the chuck body 2 in the same manner. Since the chuck body 2 grips the rigid body B, the rigid body B lowered with the chuck body 2 is driven into the ground F. At this time, for example, when the ground is hard, the chuck body 2 slightly slides on the outer peripheral surface of the rigid bar B to disperse the driving force. Thereby, the bending of the rigid rod B can be prevented.

  In the state where the pneumatic piston 8 is lowered, the first air hole 8b communicates with the escape space S, so that the air pressure in the pneumatic passage 8a is released into the atmosphere through the escape space S and the exhaust port 13a. In the pneumatic piston 8, the air pressure in the air supply chamber M enters between the middle-diameter slide portion 8e and the upper-end large-diameter piston portion 8f and pushes the step portion 8g of the large-diameter piston portion 8f to raise the pneumatic piston 8. The second air hole 8c communicates with the supply path P again, the supply of air pressure to the air space portion R again causes the pneumatic piston 8 to descend, and the rigid rod B is driven into the ground in the same manner as described above.

  After repeating this driving operation as many times as necessary to drive the rigid rod B to a certain depth, hydraulic oil is supplied from the hydraulic pump device 5 to the hydraulic space G, and the chuck body 2 is brought into an expanded state by the action of hydraulic pressure as described above. One end of the rigid rod B is opened. Next, the driving device 1 is lifted with respect to the rigid rod B by hand or the like and moved upward. From this state, the hydraulic pressure in the hydraulic space G is released and the upper part of the rigid rod B is gripped by the chuck body 2 again. Then, the pneumatic piston 8 is lowered again by the action of air pressure, and the rigid rod B is brought into the ground. Type in. By repeating these operations, the rigid rod B is driven deeply into the ground.

  The rigid rod B has a length of about 1.5 m, and a cylindrical thick connecting portion B1 is formed at the upper end thereof. Since the rigid rod B needs to be driven deeply into the ground until the electric resistance value reaches a predetermined value, usually, it is necessary to drive a plurality of rigid rods B connected in the vertical direction. In that case, the lower end portion of the upper rigid rod B is inserted into the cylindrical thick connecting portion B1 of the lower rigid rod B, and the upper rigid rod B is driven by the driving device 1 according to the present embodiment.

  The rigid rod driving apparatus 1 according to the present embodiment strongly grips the outer peripheral surface of the rigid rod B with the chuck body 2 that can be changed in the vertical position by the hydraulic pressure supplied from the hydraulic pump device 5. The pneumatic piston 8 is moved forward by the air pressure supplied from the pressure supply unit 9 to collide with the striking surface 7 a of the striking cylinder 7. Therefore, when the ground F is hard, the driving force can be released by sliding between the chuck main body 2 and the rigid rod B, so that the rigid rod B can be driven into the ground without bending.

  Further, by gripping the outer peripheral surface of the rigid bar B with the chuck body 2, the place where the driving force is applied to the rigid bar B (outer peripheral surface) can be brought closer to the tip of the rigid bar B. Bending can be prevented.

  At this time, since the inner peripheral surface of the impact receiving cylinder 7 is close to the outer peripheral surface of the rigid rod B, the impact receiving cylinder 7 functions as a guide member. Thereby, the rigid rod B can be driven more accurately without bending in the vertical direction.

  Also, since the impact receiving cylinder lower end support portion 7f whose inner peripheral surface is close to the outer peripheral surface of the rigid rod B is provided below the chuck body 2, the rigid rod B is driven accurately in the vertical direction without further bending. be able to.

  Furthermore, since the inner peripheral surface of the chuck body 2 is provided with a jagged uneven portion and is a locking surface 2b that engages with the outer peripheral surface of the rigid rod B, the chuck body 2 holds the rigid rod B more firmly. can do. Thereby, the rigid rod B can be driven into the ground more reliably.

  The present invention can also be used when a rigid rod other than a grounding rod for grounding is driven into the ground.

DESCRIPTION OF SYMBOLS 1 Rigid rod driving device 2 Chuck body 2a First inclined surface 2b Locking surface 3 Chuck jaw 3a Second inclined surface 3b T-shaped groove 4 Hydraulic piston 4a Large diameter portion 4b Small diameter portion 5 Hydraulic pump device 5a Operation rod 5b Hydraulic pressure Valve 5c Operation handle 6 Spring 7 Impact tube 7a Impact surface 7b Main body portion 7c Neck portion 7d Chuck insertion support hole 7e Strut portion 7f Lower end support portion 8 Pneumatic piston 8a Pneumatic passage 8b First air hole 8c Second air hole 8d Lower end Small diameter striking portion 8e Middle intermediate diameter slide portion 8f Upper end large diameter piston portion 8g Step portion 8h Upper end reduced diameter portion 9 Pneumatic pressure supply portion 9a Pneumatic valve 9b Rotating lever 9c Air piping 11 Front outer cylinder 11a Hydraulic port 12 Lid portion 12a Through port 13 Rear cylinder 13a Exhaust port 13b Supply port 13c Upper end large-diameter piston slide hole 13d Middle medium-diameter valve slide 13e Lower end large-diameter communication hole 14 First liner 15 Second liner 16 Back head 16a Insertion hole 17 Cover part 17a Opening B Rigid rod B1 Cylindrical thick connection part D Electric pole E Ground wire F Ground G Hydraulic space M Supply space P Supply Road R Air space S Relief space

Claims (2)

  A driving device for driving a rigid rod (B) into the ground using hydraulic pressure and air pressure, wherein the front outer cylinder (11) and the rear cylinder (13) passing through the rigid rod (B) are mutually connected. The impact receiving cylinder (7) that supports the upper and lower ends concentrically in the front outer cylinder is disposed, and a chuck insertion support hole (7d) is provided in the middle of the impact receiving cylinder (7). The outer surface of the rigid rod (B) is opposed to the outer surface of the rigid rod (B) through the chuck insertion support hole (7d), and the outer diameter of the rigid rod is strongly gripped in the reduced diameter state. The chuck body (2) that forms the first inclined surface (2a) that opens the rigid rod and whose outer peripheral surface is reduced in diameter downward, and is located on the outer peripheral side of the chuck main body, and the inner peripheral surface faces downward The diameter of the second inclined surface is reduced toward the second inclined surface (3 ) Forming a chuck jaw (3), a front end of the chuck jaw abutting on the rear end of the chuck jaw, and a hydraulic piston (4) which is provided to be movable forward and backward and move forward by hydraulic pressure; A hydraulic pump device (5) supplied by the motor, a spring (6) whose rear end abuts on the front end of the chuck jaws and presses the chuck jaws back by elasticity, and a substantially cylindrical shape, whose inner peripheral surface is the rigid body An impact receiving cylinder (7) which is disposed in the vicinity of the outer peripheral surface of the rod, the front end abuts on the rear end of the chuck body, and the rear end surface forms an impact surface (7a); and behind the impact receiving cylinder, A pneumatic piston (8) that is provided so as to be movable forward and backward, moves forward by air pressure, and has a front end that collides with the striking surface of the impact receiving cylinder, and an air pressure supply unit that supplies the air pressure by compressed air ( 9) and Rigid rod for hammering and wherein the obtaining.   A driving device for driving a rigid rod (B) into the ground using hydraulic pressure and air pressure, wherein the front outer cylinder (11) and the rear cylinder (13) passing through the rigid rod (B) are mutually connected. A striking cylinder (7) that is concentrically fixed to the front cylinder and that supports both upper and lower ends concentrically in the front outer cylinder is arranged. There are a main body part (7b) and an upper end neck part (7c). The upper end neck part (7c) is supported on the upper part of the front outer cylinder (11), and the lower end support part (7f) is the lower end cover part of the front outer cylinder (11). A chuck insertion support hole (7d) that is supported by (12) and penetrates in the radial direction is provided in the middle of the impact receiving tube main body (7b), and is downwardly formed by vertical sides orthogonal to two parallel sides. The two trapezoidal plate-shaped chuck bodies (2, 2) have their vertical sides facing inward. Are inserted from the left and right of the chuck insertion support hole (7d) and face the rigid rod (B) in the impact receiving cylinder (7), and can be reduced in diameter and expanded, and the outer peripheral surface of the rigid rod in the reduced diameter state. A chuck body (2) that forms a first inclined surface (2a) whose outer peripheral surface is reduced in diameter toward the lower side, and the outer peripheral side of the chuck main body. A chuck jaw (3) that forms a second inclined surface (3a) that contacts the first inclined surface of the chuck body and has an inner peripheral surface that is reduced in diameter downward, and a rear end of the chuck jaw. The front end is in contact with the hydraulic piston (4) which is provided so as to be movable forward and backward and move forward by hydraulic pressure, the hydraulic pump device (5) for supplying the hydraulic pressure by hydraulic oil, and the rear end of the chuck jaw. The end abuts and the A spring (6) that pushes the back jaw backward, and a substantially cylindrical shape, the inner peripheral surface of which is arranged close to the outer peripheral surface of the rigid bar, the front end abuts the rear end of the chuck body, and the rear end surface strikes A striking cylinder (7) that forms a surface (7a), and is provided in the rear of the striking cylinder so as to be able to move forward and backward, move forward by air pressure, and the front end moves to the striking surface of the striking cylinder A pneumatic piston (8) that collides, a pneumatic pressure supply unit (9) that supplies the air pressure by compressed air, and a cylindrical shape that is disposed below the chuck body, and an inner peripheral surface is an outer peripheral surface of the rigid rod And a guide cylinder (10) adjacent to the chuck body, and the inner peripheral surface of the chuck main body is a locking surface (2b) that includes a plurality of concave and convex portions and engages with the outer peripheral surface of the rigid rod. A rigid rod driving device.

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