JP4500203B2 - Ground drilling device - Google Patents

Description

  The present invention relates to a ground drilling device. More specifically, the present invention relates to a ground drilling device that is installed in a drilling machine and that rotates and excavates while applying an axial vibration force to a drilling tool and includes an inner rod.

  In civil engineering and construction work such as ground improvement, holes are often made in the ground horizontally, vertically or in an inclined direction. The hardness of the ground varies depending on the location, and if it is soft soil, there are places where it can be excavated by simply pressing the boring bit, but if the excavation distance is long or if the soil is hard, it may be difficult for normal excavation. For this reason, it is effective to apply rotation or vibration to the boring rod during excavation. For this reason, a boring machine (a perforating apparatus) that provides a vibration generator and performs perforation in order to apply reciprocating vibration to the boring rod has been proposed (for example, see Patent Document 1).

  When vibration is applied to the soil, the bond between the soil particles constituting the soil temporarily and rapidly decreases. In particular, sandy soils cause fluidization, and viscous soils cause sensitization. Therefore, excavation is performed efficiently by applying reciprocating vibration to the boring rod. In this excavation method using excavation using vibration, there is a point to consider how to reduce the resistance of soil to the boring machine and how to reduce noise. It depends on conditions such as the excitation force, amplitude, and vibration acceleration affected by the properties of the soil when vibration is applied, the structure of the drilling device, the eccentric moment, the vibration frequency, the weight, and the like.

  In order to enhance excavation in consideration of these technical conditions, the conventional drilling apparatus gives a rotational force to, for example, a bit (drilling tool) or vibrates in the axial direction (drilling direction). Also, a combination of a rotary type and an impact type has been proposed in order to increase excavation efficiency. But in any case, excavation is impactful and therefore noisy.

Especially in residential areas, the environment deteriorates and is a problem. In order to solve this problem, the present applicant further reduced the noise of the drilling device that can excavate by applying the vibration force proposed in Patent Document 1 described above, and reduced the body weight of rubber or the like for a kind of preloading. A vibration-proof drilling device that can apply a load to the boring rod and can efficiently excavate has been proposed (see Patent Document 2). Since this drilling apparatus can be efficiently constructed without noise in urban areas, residential areas, etc., it is used very effectively. On the other hand, a double-pipe perforating apparatus provided with an inner rod is also known (see, for example, Patent Document 3). However, the ground conditions are various, and a drilling device with additional functions is desired, and further development of a drilling device having a more compact configuration is desired.
Japanese Patent No. 2527774 JP 2002-97883 A Japanese Patent Laid-Open No. 09-1000068

  When the conventional ground drilling device is viewed individually as described above, the conventional problems are solved as such. However, when drilling the ground, the ground conditions are various as described above, and various functions are required. The ground that needs to be excavated by a drilling device has various constraints such as the size of the land, the geology, the hardness of the ground, the environment, noise, and the timing of construction. In order to cope with such a demand, there is a demand for a device having various functions and easy maintenance, and having a compact configuration. The double pipe punching device described above is a device that rotates and drills the inner rod, but does not have a function of vibrating the punching device itself.

In consideration of such a conventional problem, the present invention achieves the following object by further improving the technique disclosed in the aforementioned patent document.
An object of the present invention is to provide a ground drilling device that is rotary, excavates while being vibrated, generates less noise, has a compact configuration, and is easy to maintain.

  Another object of the present invention is to provide a ground drilling device configured to supply water or the like into a drilling hole.

The present invention takes the following means in order to achieve the object.
The ground drilling device of the present invention 1 is movably mounted on a fixed frame of a drilling machine, and the drilling rod can be moved forward and backward with respect to the ground by a double pipe, and drilling can be performed by applying rotation and vibration force. A traveling frame body movable relative to the ground so as to be able to move forward and backward, a base fixed to the traveling frame body, and provided with the base to provide a vibration force and the base An exciter capable of moving forward and backward, an anti-vibration device provided between the exciter and the base for preventing resonance at the time of drilling, and supported by the exciter via a bearing so as to be relatively rotatable, An outer shank that is fixed to the excavation rod outside the double pipe, a rotation drive device that rotationally drives the outer shank provided in the traveling frame body, and the outer shank. And consisting of an inner rod which can move together with the traveling frame body provided.

  The ground drilling device of the present invention 2 is the ground drilling device of the present invention 1, characterized in that the outer shank is provided with a clamping device for clamping the inner rod.

  A ground drilling device according to a third aspect of the invention is the ground drilling device according to the first aspect, wherein the vibration generating device is disposed symmetrically facing a case disposed outside the base and the case across the base. And an eccentric rotor fixed to the output shaft of the motor.

  The ground drilling device of the present invention 4 is the ground drilling device of the present invention 1, characterized in that the traveling frame body is provided with an inner rod feed base capable of moving the inner rod to the ground side. To do.

  The ground drilling device of the present invention 5 is the ground drilling device of the present invention 4, wherein the case is disposed so as to surround an outer periphery of the base, and the vibration generating device is disposed on the outer periphery of the case. Features.

  A ground drilling device according to a sixth aspect of the present invention is the ground drilling device according to the fourth aspect, wherein the inner rod feed base is provided with a second vibration generating device that applies a vibration force to the inner rod and can move forward and backward together with the base. It is characterized by being.

  A ground drilling device according to a seventh aspect of the present invention is the ground drilling device according to the sixth aspect, wherein the second vibration generating device is disposed on a second base fixed to the inner rod feed base and on the outer side of the second base. The second case, a second motor disposed symmetrically facing the second case with the second base interposed therebetween, and an eccentric rotor fixed to the output shaft of the second motor. And

  The ground drilling device of the present invention 8 is the ground drilling device of the present invention 6, wherein the second case is disposed so as to surround an outer periphery of the second base, and the second vibration is placed on the outer periphery of the second case. A device is arranged.

  The ground drilling device of the present invention 9 is the ground drilling device of the present invention 6, wherein the inner rod is supported by the second vibration device via a bearing so as to be relatively rotatable, The feed base is provided with a second rotational drive device for rotationally driving the inner rod.

  The ground drilling apparatus of the present invention 10 is the ground drilling apparatus of the present invention 1-9, wherein the vibration isolator is rubber.

  The ground drilling apparatus according to the present invention is a rotary type, and excavates by exciting, and by providing a vibration isolator, the apparatus generates less noise. In addition, since the vibration generator and the like that require maintenance are arranged outside the punching device, the maintenance becomes easy. Furthermore, the efficiency of drilling work has been improved by adopting a configuration that can supply water and the like into the drilling hole. Despite the addition of these functions, the configuration could be made compact.

[Embodiment 1]
The first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall front view of a drilling machine 1 equipped with a ground drilling device 3 according to a first embodiment of the present invention.
The drilling machine 1 of the first embodiment is of a type that can travel on an endless track. It can be moved easily even on uneven ground or in a narrow residential area where the scaffolding is poor, and ground excavation work can be done at any place. Since the basic configuration of the ground drilling device 3 for the drilling machine 1 is described in the above-mentioned Patent Document 1 and Patent Document 2, detailed description thereof will be omitted, but in order to facilitate understanding of the first embodiment. The outline will be described.

  In the drilling machine 1, a ground drilling device 3 according to the first embodiment is mounted on a fixed frame 2 that is substantially perpendicular (vertical) to the ground so as to be movable in the vertical direction. When the fixed frame 2 is erected vertically, the vertical direction is set, but the movement direction of the ground drilling device 3 is a forward / backward movement direction with respect to the ground. That is, it is a drilling direction along the central axis of the drilling tool (hereinafter referred to as “drilling direction”). The fixed frame 2 can change its direction not only in the vertical direction but also in the horizontal direction, and the ground drilling device 3 can also change the direction to perform drilling.

  FIG. 2 is a front view of the ground drilling device 3 to which each device related to drilling is attached. The ground drilling device 3 is mounted on a traveling frame 4 that is movably mounted on the fixed frame 2. The ground drilling device 3 includes a drilling tool rotation drive device 5, a vibration generator 6, a vibration isolator 7 (see FIG. 3), an inner rod 8, and the like. Although not shown, the running frame 4 can be run on the fixed frame 2 by a chain driving means (not shown) via a plurality of rollers. A base 9 is fixed integrally with the traveling frame 4, and a vibration generator 6 and a vibration isolator 7 are provided on the base 9.

  A box 5 a portion that is a main body case of the rotation drive device 5 is fixed to the front portion of the traveling frame 4. On the other hand, a support base 10 a is fixedly arranged at the rear portion of the traveling frame 4. An inner rod feed base (hereinafter referred to as “feed base”) 10 is mounted on the support base 10a so as to be movable in the front-rear direction, and is moved in the front-rear direction relative to the traveling frame 4 by driving means such as a hydraulic cylinder device. Can be moved to. A device for supporting the inner rod 8 is fixed to the feed base 10. FIG. 3 is a cross-sectional view showing a detailed structure of the ground drilling device 3 according to the first embodiment. FIG. 3 does not include the structure of the feed base 10. A hollow outer shank 11 for attaching a drilling tool (bit) to the end and performing a drilling operation is provided at the center of the ground drilling device 3.

  The outer shank 11 is rotationally driven by the rotational drive device 5. The rotational drive device 5 is described in detail in Patent Document 2 described above, but in the first embodiment, the configuration of Patent Document 2 is the same as that of the Patent Document 2 in that the inner rod 8 is passed through the outer shank 11. Different. The rotary drive device 5 of the first embodiment has the following configuration. A ring gear 12 having external teeth in the box 5a is fixed to the sleeve body 13, and is rotatably supported by the box 5a via two bearings 14.

  The ring gear 12 is connected to the outer shank 11 via a spline 15. The spline 15 may be a key. Two drive motors 16 are fixed to the box 5a. The drive motor 16 is a hydraulic motor, and each output shaft 16a protrudes into the box 5a. A pinion 17 is attached to the output shaft 16 a, and the pinion 17 meshes with the external teeth of the ring gear 12. Accordingly, the outer shank 11 is rotationally driven through the pinion 17 and the ring gear 12 by the rotation of the drive motor 16.

  Next, the vibration generator 6 and the vibration isolator 7 will be described. The vibration generator 6 and the outer shank 11 are rotatably connected via two bearings 18. Therefore, the vibration generating device 6 is provided with a configuration in which the movement in the axial direction is restricted with respect to the outer shank 11 and is relatively rotated. The vibration generator 6 is supported by the base 9, but a vibration isolator 7 is provided between the base 9 and the vibration generator 6. The vibration generator 6 and the vibration isolator 7 are arranged in a substantially series state in the base 9 portion so as to face each other in a direction perpendicular to the drilling direction. The base 9 supports the vibration generating device 6 and the vibration isolating device 7, and an inner rod 8 is disposed through the central portion of the base 9, that is, the inside.

  Further, the vibration generator 6 and the vibration isolator 7 are provided outside the base 9 fixed to the traveling frame 4 in consideration of ease of maintenance. The outer wall of the base 9 and the case 6a of the vibration generator 6 are fixed integrally with each other by a vibration isolating rubber 7a. Metal plate-like flanges are integrally fixed to the anti-vibration rubber 7a at both ends of the anti-vibration rubber 7a. The outer wall of the base 9 and the case 6a of the vibration generator 6 are fixed to each other by fixing the flange at one end of the vibration isolating rubber 7a to the case 6a with the bolt 7b and the flange at the other end of the vibration isolating rubber 7a to the base 9. This is done by connecting.

  The anti-vibration rubber 7a is detachable by being attached with bolts 7b. A plurality of anti-vibration rubbers 7a are attached and the number is not limited. However, in the first embodiment, the number is four or eight. The vibration isolator 7 may be a spring other than the vibration isolating rubber. The vibration isolator 7 has a function of preventing resonance when the vibration generator 6 vibrates, and also has a function of reducing vibration and noise. At the same time, the outer shank 11 functions to transmit the feed force by the feed drive device mounted on the fixed frame 2 in the drilling direction through the vibration isolator 7 during excavation.

  It is also possible to load the weight of the drilling machine 1 with this feed force. This feed force can be said to be a preload necessary for overcoming the drag that the bit at the tip of the outer shank 11 receives from the ground during excavation. Therefore, the vibration isolating rubber 7a has a pressing function, a supporting function, and a vibration damping function.

  This anti-vibration rubber 7 a is also fixed to the case 6 a of the vibration generator 6 in the same manner as the base 9. Accordingly, the anti-vibration rubber 7a is attached while being sandwiched between the base 9 and the case 6a. The case 6a of the vibration generator 6 has a margin of displacement with respect to the base 9 in the perforation direction and the direction crossing the perforation direction by the vibration isolating rubber 7a. The outer wall of the case 6a is provided with an eccentric rotor 6b that forms the main part of the vibration generating device 6, and a motor 6c that rotationally drives the eccentric rotor 6b.

  The arrangement of the eccentric rotor 6b and the motor 6c on the outside takes into consideration the ease of work during maintenance. The eccentric rotor 6b is a kind of weight body that has a weight and is a rotating rotor having a configuration in which the position of the center of gravity is shifted in the radial direction with respect to the rotation center. The eccentric rotor 6b is provided at both shaft ends of the motor 6c as shown in FIG. When the eccentric rotor 6b rotates, the position of the center of gravity fluctuates and vibrations are generated. Thus, in this Embodiment 1, this eccentric rotor 6b is a vibrator motor of the structure directly attached to the motor.

  Two or four sets of the vibro motors are provided symmetrically on the outer wall of the case 6a of the vibration generator 6 with the base 9 interposed therebetween, and are evenly paired. Each eccentric rotor 6b rotates synchronously so that the positions of the center of gravity rotate in opposite directions. Therefore, when the two eccentric rotors 6b rotate, the center of gravity of each eccentric rotor 6b shifts in the drilling direction and moves toward or away from the ground, and theoretically, the case 6a swings only in the drilling direction. That is, vibration is applied only in the axial direction. Actually, it slightly swings in the direction crossing the drilling direction as it approaches or separates from the base 9 side.

  Theoretically, the position of the center of gravity formed by the eccentric rotor 6b and the motor 6c that form a pair is a balanced position and does not swing, but in reality, it swings in a complicated manner. Such a movement causes the case 6a to vibrate particularly in the drilling direction. The case 6a of the vibration generator 6 and the outer shank 11 are connected by two bearings 18 that regulate the radial direction and the drilling direction. The case 6a does not rotate, but the outer shank 11 is relatively rotated.

  Moreover, it moves forward and backward integrally with respect to the drilling direction. Therefore, the vibration generated in the case 6a is transmitted to the outer shank 11 as vibration in the drilling direction. By attaching the anti-vibration rubber 7a, the outer shank 11 prevents vibration and prevents vibration when the traveling frame 4 moves toward the ground while being vibrated from the case 6a via the anti-vibration rubber 7a. The outer shank 11 is pressed in the drilling direction via the bearing 18. At this time, despite the vibration state, a part of the vibration is attenuated by the vibration isolating rubber 7a to reduce the generation of noise. Although not shown, the vibration generator 6 and the vibration isolator 7 may be provided with a detachable cover that covers the whole in consideration of dust prevention and safety.

  Next, the inner rod 8 will be described. The inner rod 8 is for increasing the excavation efficiency during excavation or for supplying water for cooling. This inner rod 8 can also perform a drilling operation as a supplement when a drilling tool is attached to the tip. In the first embodiment, the inner rod 8 is described for water supply, but it may be used for supplying milled cement. The inner rod 8 is attached to a feed base 10 movably mounted on a support base 10a provided on the traveling frame 4 behind the base. As described above, the feed base 10 is configured to be able to move forward and backward relative to the traveling frame 4 by a hydraulic cylinder in the drilling direction. An inner vibro case 19 and an inner swivel case 20 are fixed to the feed base 10.

  The inner vibro case 19 is adapted to be vibrated when the inner rod 8 is advanced to the ground side. The inner swivel case 20 is configured to have a swivel function when the inner rod 8 is advanced, and is supported by a configuration that can rotate on the feed base 10 and slightly shift in the horizontal direction. The inner vibro case 19 and the inner swivel case 20 are driving portions of the inner rod 8, and the inner rod 8 is coupled to an end portion of the inner swivel case 20 that protrudes to the ground side. The inner rod 8 described in the first embodiment is a hollow tube, and water is guided to the inner rod 8 through a water supply swivel 21 provided in the middle of the inner rod 8 and supplied to the perforated hole.

  Since the bit which is a drilling tool is provided in the front-end | tip part of the outer shank 11, a bit is excavated, receiving a vibration by pressing operation and rotating. At this time, since the inner rod 8 penetrates the outer shank 11, as described above, water can be fed through the inner rod 8, and the excavation ability of the ground can be enhanced.

  Ground excavation work generally involves noise. Especially in the residential area, it is necessary to avoid the surrounding environment. In the case of the first embodiment, since a vibration isolator is provided and excavation work is performed through the vibration isolator, noise and vibration during excavation can be reduced. In addition, when excavation is finished, this vibration isolator has a function of canceling the vibration state. As described above, the first embodiment is an apparatus that has two inner and outer pipe bodies and excavates with improved excavation efficiency, and has a compact configuration that facilitates maintenance by arranging the vibration generator on the outside. Yes.

[Embodiment 2]
Next, as another embodiment, a configuration of the second embodiment in which the excavation efficiency of the inner rod is increased will be described.
In the second embodiment, the vibration generator and the vibration isolator provided on the outer shank side are also provided on the inner rod side. The second embodiment replaces the inner vibro case described above. FIG. 4 is a partial cross-sectional view on the inner rod side showing the configuration.

  Since the outer shank side is the same as the structure of FIG. 3, a detailed view is omitted. In FIG. 4, the inner rod 8 a penetrates the inside of the outer shank 11 as an inner pipe, and the device relating to the inner rod 8 a is arranged behind the excavating device of the outer shank 11. The vibration generator (second vibration generator) 25 and the vibration isolator 22 of the inner rod 8a have substantially the same configuration as that of the outer shank 11, and the rotation drive device (second rotation drive device) of the inner rod 8a. 23 is also arranged behind the inner rod 8a with the same configuration as that of the outer shank 11.

  An inner rod base (second base) 24 is integrally fixed to the feed base 10. Therefore, the vibration generator 25 and the vibration isolator 22 are supported by the base 24. The feed base 10 can move relative to the traveling frame 4. Accordingly, when the base 9 for the outer shank 11 moves, the base 24 also moves together. For example, even when the base 9 is in a fixed state, the base 24 is independently moved relative to the base 9 in the drilling direction. It is possible to move a predetermined distance like a two-dot chain line.

  A vibration generator 25 and a vibration isolator 22 are arranged on the base 24 so as to face each other in a direction perpendicular to the perforation direction. An anti-vibration rubber 22a, which is a main part of the anti-vibration device 22, is attached to the outer wall of the base 24 by a bolt 22b via a flange 22c. The anti-vibration rubber 22a used here is a member having substantially the same structure and function as the outer shank side. The anti-vibration rubber 22a is also fixed to the case (second case) 25b of the vibration generator 25 to which the eccentric motor (second motor) 25a is attached. Eccentric rotors 25c are provided at both shaft ends of the eccentric motor 25a.

  Therefore, when the base 24 is sent in the perforating direction, the vibration isolator 22 is also sent integrally while holding the inner rod 8a, and at the same time, the vibration generator 25 is also sent in the same direction via the vibration isolating rubber 22a. Further, the vibration generator 25 and the inner rod 8a are configured to be relatively rotatable via two bearings 28 in which the radial direction and the drilling direction are regulated. That is, even if the inner rod 8a rotates when excavating or the like, the vibration generator 25 does not rotate. These configurations are basically the same as those of the outer shank 11.

  The rotational drive device 23 is also arranged behind the vibration generator 25 with the same configuration as that of the outer shank 11. Since the details of the configuration are the same as those of the outer shank 11, the description thereof is omitted. A part of the inner rod 8a related to the rotation drive device 23 is a spline 23c that meshes with the sleeve body 23b. The other members, the gear 23d, the pinion 23e, the drive motor 23f, the bearing 23g, and the like are members that are substantially the same in structure and function as the outer shank 11 side. That is, the gear 23d is fixed to the sleeve body 23b, and the box 23a is rotatably supported via the two bearings 23g. A drive motor 23f is fixed to the box 23a. A pinion 23e attached to the output shaft of the drive motor 23f meshes with the gear 23d. Note that the gear 23d, the pinion 23e, the drive motor 23f, the bearing 23g, and the like may be members common to the members on the outer shank 11 side.

  With such a configuration, the inner rod 8a can rotate relative to the outer shank 11. The inner rod 8a has a diameter different from that of the outer shank 11, and related members such as a sleeve body are shaped to fit the inner rod 8a in this relationship, and the member shape is different from that of the outer shank 11. The box 23 a of the rotational drive device 23 is fixed to the feed base 10.

  As described above, the vibration generator 25, the vibration isolator 22, and the rotation drive device 23 for the inner rod 8a have been described on the assumption that the inner rod 8a moves relative to the outer shank 11 side. In the construction to be performed, the feed base 10 is not attached, so that each device for the inner rod 8a is provided in the traveling frame 4. In this case, although not shown, the base 9 and the base 24 are fixed to the traveling frame 4 as a single unit. Other configurations are as described above. In this case, although the inner rod 8a rotates relative to the outer shank 11, excavation is performed by simultaneous movement.

[Embodiment 3]
Next, a third embodiment having a different configuration will be described with reference to FIG.
The third embodiment is applied to an installation-type ground drilling machine that is installed and used at a predetermined location. The basic configuration of this installation type drilling machine is well known and described in the applicant's published patent, for example, Japanese Patent Application Laid-Open No. 7-76823, and the detailed description thereof is omitted. The fixed type drilling machine is fixed at a predetermined ground position by a crane or the like and performs drilling. In FIG. 5, the vibration generator 31, the vibration isolator 32, and the rotation drive device 33 according to the third embodiment are guided and moved up and down by being sandwiched by a frame 34 that forms the base of the drilling machine as shown in the figure.

  FIG. 5 is a partial cross-sectional view of the main part. The support 35 is guided and moved on the frame 34 in the vertical direction. The support 35 has a symmetrical shape and is guided by two guide portions of the opposing frame 34. An outer shank 36 is provided at the center of the support 35, and a rotation driving device 33 for rotating the outer shank 36 is provided at a lower position. In addition, a tube clamp device 37 provided through the outer shank 36 is provided at an intermediate position, and a vibration generator 31 and a vibration isolator 32 for the outer shank 36 are provided at an upper position.

  The case 33a of the rotary drive device 33 is connected to the cylinder portions of the two vertical drive cylinders 41a and 41b and is provided on the support 35 so as to be movable up and down. Accordingly, the case 33a is driven up and down by the two vertical drive cylinders 41a and 41b. A sleeve 33c integrated with the gear 33b via a key is key-connected by an outer shank 36 and a key 33d and is provided in the case 33a. The outer shank 36 is movable relative to the sleeve 33c in the drilling direction. The gear 33b rotates in mesh with a pinion connected to a drive motor (not shown). The gear 33b is relatively rotatable via a case 33a and a bearing 33e. It is possible to move.

The clamping device 37 of the intermediate part is a disc spring 37a as a main part, and the wedge body 37b is always pressed through the pressing member 37c by the biasing force of the disc spring 37a, and the wedge body 37b presses the tube. The body (in the embodiment, the inner rod) is clamped. When releasing the clamp, when the outer shank 36 moves relatively downward, the pressing member 37c comes into contact with the clamp releasing means 38, and the pressing member 37c operates against the urging force of the disc spring 37a. Release the wedge force.
Since the pressing member 37c is configured to abut via the bearing 38a of the clamp releasing means 38, the main body portion of the clamp releasing means 38 does not rotate even when the pressing member 37c contacts with the outer shank 36 while rotating. It has become. When the outer shank 36 moves rearward (upward), the pressing member 37c is separated from the clamp releasing means 38, and the wedge body 37b is pressed again by the urging force of the disc spring 37a to clamp the tube body. This operation is repeated.

  The vibration generator 31 and the vibration isolator 32 are basically the same as those in the first and second embodiments. The vibration isolator 32 is fixed to the support body 35, the vibration generator 31 is fixed to the vibration isolator 32, and the outer shank 36 is relatively rotatable via the vibration generator 31 and the bearing 39. In the third embodiment, the vibration generating device 31 and the like are provided across the support bodies 35. However, the lateral portion outside the support body 35 is located outside the support body 35 and is in an open state. For this reason, the configuration is easy to maintain.

  As in the first and second embodiments described above, the vibration generating device 31 is integrated with the support body 35 via the vibration isolation device 32, and moves forward and backward together with the support body 35. The center portion of the outer shank 36 is a through hole, and the center portion of the vibration generator 31 is also a through hole, and the inner rod 40 is provided. A device having a necessary function of the inner rod 40 is provided rearward (upward). Since the function of the inner rod 40 such as water feeding is the same as described above, detailed description thereof is omitted. In addition, as in the first and second embodiments described above, the inner rod 40 can be provided with a vibration generating device, a vibration isolating device, and a rotation driving device.

  As mentioned above, although Embodiment 1-3 of this invention was demonstrated, this invention is not limited to this embodiment. Needless to say, modifications can be made without departing from the object and spirit of the present invention.

FIG. 1 is an overall front view of a drilling machine equipped with a ground drilling apparatus of the present invention. FIG. 2 is a front view of the ground drilling device of the present invention. FIG. 3 is a sectional view showing details of the ground drilling device of the present invention. FIG. 4 is a partial cross-sectional view of a ground drilling device having a configuration in which a vibration generator, a vibration isolator, and a rotation drive device are provided on the inner rod according to another embodiment of the present invention. FIG. 5 is a sectional view of the ground drilling apparatus of the present invention applied to a fixed type drilling machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Drilling machine 2 ... Fixed frame 3 ... Ground drilling device 4 ... Traveling frame 5, 23, 33 ... Rotation drive device 6, 25, 31 ... Vibration generator 7, 22, 32 ... Vibration isolator 8, 8a, 40 ... Inner rod 9 ... Base 10 ... Inner rod feed base 11,36 ... Outer shank 34 ... Frame 35 ... Support 37 ... Clamp device

Claims (10)

A drilling device that is movably mounted on a fixed frame of a drilling machine, and allows excavation rods to move forward and backward with respect to the ground by a double pipe, and to be excavated by applying a rotational and vibration force.
A traveling frame body (4, 35) movable relative to the ground so as to freely advance and retreat on the fixed frame;
A base (9) fixed to the traveling frame body (4, 35);
A vibration generator (6, 25, 31) provided on the base (9), which gives a vibration force and can move forward and backward together with the base (9);
A vibration isolator (7, 22, 32) provided between the vibration generator (6, 25, 31) and the base (9) for preventing resonance during drilling;
An outer shank (11, 36) supported by the vibration generator (6, 25, 31) via a bearing (18, 39) so as to be relatively rotatable and fixed to the excavation rod outside the double pipe; ,
A rotational drive device (5, 33) for rotationally driving the outer shank (11, 36) provided on the traveling frame body (4, 35);
A ground drilling device comprising an inner rod (8, 8a, 40) provided through the outer shank (11, 36) and movable with the traveling frame body (4, 35). The ground drilling device according to claim 1,
The outer shank (36) is provided with a clamping device (37) for clamping the inner rod (40). The ground drilling device according to claim 1,
The vibration generator (6)
A case (6a) disposed outside the base (9);
A motor (6c) disposed symmetrically opposite to the case (6a) with the base (9) interposed therebetween;
A ground drilling device comprising an eccentric rotor (6b) fixed to the output shaft of the motor (6c). The ground drilling device according to claim 1,
The ground drilling device, wherein the traveling frame body (4) is provided with an inner rod feed base (10) capable of moving the inner rods (8, 8a) toward the ground side. The ground drilling device according to claim 4,
The case (6a) is disposed so as to surround the outer periphery of the base (9), and the vibration exciter (6) is disposed on the outer periphery of the case (6a). . The ground drilling device according to claim 4,
The inner rod feed base (10) is provided with a second vibration generator (25) that applies a vibration force to the inner rod (8a) and can move forward and backward together with the base (9). Ground drilling device. The ground drilling device according to claim 6, wherein
The second vibration device (25)
A second base (24) fixed to the inner rod feed base (10);
A second case (25b) disposed outside the second base (24);
A second motor (25a) disposed symmetrically facing the second case (25b) across the second base (24);
A ground drilling device comprising an eccentric rotor (25c) fixed to the output shaft of the second motor (25a). The ground drilling device according to claim 6, wherein
The second case (25b) is disposed so as to surround the outer periphery of the second base (24), and the second vibrator (25) is disposed on the outer periphery of the second case (25b). A ground drilling device characterized by that. The ground drilling device according to claim 6, wherein
The inner rod (8a)
The second vibration device (25) is supported by a relative rotation via a bearing (28),
The ground drilling device, wherein the inner rod feed base (10) is provided with a second rotational drive device (23) for rotationally driving the inner rod (8a). The ground drilling device according to claim 1, which is selected from claims 1 to 9,
The vibration isolator (7, 22, 32) is rubber (7a, 22a).

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