JP2005133313A - Drill head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drill head A, holding a buried material such as a steel pipe 100 buried while being rotated at a lower position, thereby facilitating and stabilizing the work for chucking the steel pipe before the start of work. <P>SOLUTION: This drill head A is split into two drill head body structures 20A, 20B, and a hollow rotating shaft 30 with a chuck 50 is also split into two rotating shaft members 30A, 30B, which are respectively rotatably fitted to the drill head body structures 20A, 20B. In the drill head A, in the open state shown in the drawing, the steel pipe 100 is taken in, and in the close state of the drill head body structures 20A, 20B, the steel pipe 100 is chucked in the hollow rotating shaft 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drill head used for embedding in an underground material while rotating an embedding material such as a steel pipe having a drilling blade at a tip.

  There is known a rotary embedding device in which a slider or chain is attached to a guide member such as a leader mast supported by a self-propelled vehicle, and a drill head is attached to the slider or chain via a mounting portion. For example, a steel pipe with a drilling blade at the tip is attached to the drill head, and the drill head is gradually lowered using the operation of the slider and chain while rotating the steel pipe by a drive mechanism assembled in the drill head. The steel pipe is buried in the ground while drilling itself.

As a drill head, for example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2001-49980), a hollow rotary shaft provided with a chuck for gripping an embedded material, a chuck operation unit, and a hollow rotary shaft are provided. A configuration including a drill body provided with a frame body rotatably supported, a drive mechanism for rotationally driving the hollow rotary shaft, and a mounting portion for attaching the drill head body to the guide member. Are known.
Japanese Patent Laid-Open No. 2001-49980

  In embedding the steel pipe in the above-described apparatus, it is necessary to support the end (upper end) opposite to the embedding side of the steel pipe with the drill head portion. The drill head is lifted to a high position along the vertically standing leader mast, and the axial center line between the upper end of the steel pipe that has been erected vertically and the hollow rotary shaft of the drill head are aligned by appropriate means. Then, after slightly lowering the drill head so that the upper end side of the steel pipe enters the hollow rotary shaft, the chuck is moved to firmly hold the steel pipe in the hollow rotary shaft.

  The steel pipe is gradually embedded by applying rotation to the rotating hollow shaft using a drive mechanism including a hydraulic motor and a gear reduction mechanism, and slowly lowering the drill head while rotating the steel pipe by the rotation. After embedding, the chuck is operated to release the connection between the steel pipe and the drill head, and the drill head is pulled up again to complete the work of embedding one steel pipe. Thereafter, the second, third,... Steel pipes are embedded in the same manner.

  As described above, in the conventional embedding work of steel pipes using a drill head, it is necessary to lift the drill head to a position beyond the upper end of the steel pipe along the leader mast in order to chuck the steel pipe. If the steel pipe to be embedded is long, not only is the lifting work difficult, but the center of gravity position becomes high, so careful work is required in terms of safety management, such as prevention of falling. . In particular, as described above, a drill head having a hollow rotary shaft, a chuck, a drive mechanism, and the like tends to be heavy and requires careful work.

  The present invention has been made in view of the circumstances as described above, and enables embedding materials such as steel pipes and earth augers to be embedded while being rotated at a low position. An object of the present invention is to provide an improved drill head that can easily and stably perform gripping (chucking) work.

  A drill head according to the present invention includes a hollow rotary shaft provided with a chuck for gripping an embedded material, a chuck operation unit, a frame body that rotatably supports the hollow rotary shaft, and a rotary drive for rotating the hollow rotary shaft. A drill head comprising a drill head main body provided with a drive mechanism and a mounting part for mounting the drill head main body on a guide member, the drill head main body including two hollow heads including a hollow rotating part It is possible to divide as a part structure, and in a posture in which the drill head body part structure is divided into two, it is possible to pass the open region and accommodate the embedded material in the rotating hollow shaft, and In this posture, the rotational drive from the drive mechanism can be transmitted to the embedding material through a hollow rotary shaft.

  The drill head is attached by fixing its mounting portion to a movable member such as a slider or chain that moves in the vertical direction along a guide member such as a leader mast supported by the vehicle. By moving the movable member along the guide member by an appropriate drive mechanism, the drill head moves along the guide member together with the movable member, and stops at an arbitrary position.

  In starting the embedding work of an embedding material such as a steel pipe, the drill head is positioned in the vicinity of the lower end of the guide member, and the two drill head main body components constituting the drill head main body are opened (divided); To do. At that time, the chuck is kept in a non-operating position. On the other hand, the embedding material is temporarily set up by an appropriate method. And after positioning an embedding material in the space between the rotation hollow shaft divided | segmented into two through the open area | region between two drill head main-body structure components, two drill head main-body structure Close the body and unite. In this state, both dimensions are set in advance so that a slight gap exists between the inner periphery of the closed and closed rotating hollow shaft and the outer periphery of the embedding material. Since the above operation can be performed with the drill head positioned near the lower end of the guide member, it is easy and there is no possibility of falling.

  A movable member such as a slider or a chain is raised along the guide member by operating the vehicle side. As a result, the drill head ascends while holding the embedded material in the rotating hollow shaft. After rising to a predetermined height, the chuck operating unit is operated to chuck the embedded material so as to be integrated with the hollow rotary shaft, and a rotary drive mechanism such as a hydraulic motor is operated to rotate the hollow. Give rotation to the shaft. At this time, the hollow rotary shaft and the embedding material are integrated via a chuck, and the embedding material also rotates simultaneously. By lowering the movable member along the guide member, the drill head gradually descends, and the embedded material is buried in the ground while excavating itself. Thereafter, this operation is repeated as many times as necessary.

  In the present invention, means for making the two drill head main body components open and closed are arbitrary, but each drill head main body is attached to the mounting portion via a pivot shaft, It is preferable that a retractable actuator such as a hydraulic piston is interposed between the mounting portion and each drill head main body constituting member from the viewpoint of ease of operation. Further, the drive mechanism may be constituted by one hydraulic motor and a gear reduction mechanism, and the two drill head main body components may be provided with a hydraulic motor and a gear reduction mechanism, respectively. What is necessary is just to select suitably considering the force required for excavation, the balance of the whole apparatus, etc.

  When the drill head main body is divided into two drill head main body components, the split surface and the split surface of the hollow rotary shaft that is split into two at the same time in the axial direction are substantially the same. is necessary. In order to ensure that, means are preferably provided for positioning the two hollow rotary shafts divided for each of the two divided frames. Preferably, the positioning means is composed of an internally biased pin attached to the frame body side and a pin hole formed on the hollow rotating shaft side, and the divided surface of the frame body and the divided surface of the hollow rotating shaft are substantially The pin is allowed to enter the pin hole when it matches. When the hollow rotary shaft rotates as a unit, the pin is held in a retracted position by appropriate means, and the drill head main body is divided into two drill head main body components. Apply an inward biasing force to the pin. If the hollow rotating shaft is slowly rotated in this state, the pin enters the pin hole during the rotation, and the drive mechanism is stopped there. In this state, the actuator is operated to divide the drill head main body into two drill head main body components.

  The present invention also provides, as a drill head without a chuck, a hollow rotating shaft that is divided in the axial direction for gripping an embedded material, a frame that rotatably supports the hollow rotating shaft, and a rotating hollow rotating shaft. A drill head comprising a drill head main body having a drive mechanism for driving and a mounting portion for mounting the drill head main body on a guide member, the drill head main body including a hollow rotary shaft 2 It can be divided as one drill head main body constituting body, and in the posture in which the drill head main body constituting body is divided into two, it can be accommodated in a rotary hollow shaft obtained by passing the open region and dividing the embedded material. Also disclosed is a drill head characterized in that in an integrated posture, the rotational drive from the drive mechanism can be transmitted to the implant via a hollow rotary shaft. . In this drill head, a required pile driving operation or the like can be performed by a method using some kind of chuck means as a separate member.

  Furthermore, the present invention includes, as a drill head that does not include a rotation mechanism, a hollow shaft that is provided with a chuck for gripping an embedded material and that is divided in the axial direction, a chuck operation unit, and a frame that supports the hollow shaft. A drill head comprising a drill head main body and a mounting portion for mounting the drill head main body on a guide member, wherein the drill head main body can be divided into two drill head main body components including a hollow shaft. In the posture in which the drill head main body component is divided into two parts, it is possible to pass the open region and accommodate the embedded material in the divided hollow shaft, and in the integrated posture, the chuck Accordingly, a drill head is also disclosed in which the embedding material is held by a hollow shaft. This device can be effectively used for the purpose of simply gripping and transferring a steel pipe or the like, and can separately perform a required pile driving operation or the like by a method of simultaneously using some kind of rotation mechanism.

  According to the present invention, when performing a work of embedding a steel pipe or the like having a drilling blade at the tip using a drill head having a hollow rotating shaft, the work of mounting the steel pipe or the like to the drill head is very easy. And it becomes possible to carry out stably, and the safety | security of work can be improved greatly.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings. 1 is a side view showing a state in which a drill head A according to the present invention is mounted on a vehicle B, FIG. 2 is a side view of the drill head A, FIG. 3 is a cross-sectional view perpendicular to the paper surface in FIG. 3 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along line V-V in FIG. FIG. 6 is a view corresponding to FIG. 4 showing a state in which the drill head A is divided into two drill head main body constituting bodies 20A and 20B.

  The vehicle B is arbitrary as long as it has a mechanism that can move the drill head A in the vertical direction, but in the example shown in the figure, the vehicle B is a self-propelled type equipped with a caterpillar 1 as a traveling body, and has a leader in front. The mast 2 is provided so that it can control the posture from a vertical posture to a horizontal posture. A guide 3 and a chain (not shown) are attached to the leader mast 2. By attaching the mounting portion 10 of the drill head A to the chain, the drill head A moves vertically along the guide 3 along with the movement of the chain. To do.

  The drill head A is composed of the mounting portion 10 and the drill head main body portion 20, and the drill head main body portion 20 is divided into two drill head main body structure bodies 20A and 20B having substantially the same configuration as mirror surfaces. It is possible. The drill head body 20 further includes a hollow rotary shaft 30, and the hollow rotary shaft 30 includes two rotary shaft members 30 </ b> A and 30 </ b> B that are divided in the central axis L direction. Then, as shown in FIG. 6, when the drill head main body 20 is separated into two, one drill shaft main body constituting body 20A has one rotary shaft member 30A and the other drill head main body constituting body. The other rotating shaft member 30B is integrally separated from 20B.

  This will be described in detail below. The mounting portion 10 includes a substrate 11 having left and right guide members 12, and the mounting portion 10 moves along the guide 3 in a posture in which each guide member 12 grips the guide 3. A pair of pivot shafts 13 are provided on the opposite side of the substrate 11 from the guide member 12, and the drill head main body constituting bodies 20 </ b> A and 20 </ b> B can swing on the pivot shafts 13 in a mirror surface manner. Has been. The drill head main body constituting bodies 20A and 20B are connected to the mounting part 10 via the hydraulic piston cylinder device 14, respectively. When the hydraulic piston cylinder device 14 is operated, the two drill head main body constituting bodies 20A and 20B are connected. Takes the open position shown in FIG. 6 and the closed position shown in FIGS.

  As described above, the two drill head main body components 20A and 20B have the same configuration in terms of mirror surface. Each drill head body component 20 </ b> A, 20 </ b> B has a box-shaped frame 24 composed of a top plate 21, a bottom plate 22, and a side wall 23. Notches are formed, and the rotary shaft members 30A and 30B are respectively arranged so as to be rotatable. That is, a semi-cylindrical peripheral wall 40a is erected along the notch of the top plate 21, and a cylindrical convex edge 26 that can be engaged with the lower ends of the rotary shaft members 30A and 30B is formed on the back surface of the bottom plate 22. A semi-disc shaped flange 27 is attached. As shown in FIG. 3, the rotary shaft members 30 </ b> A and 30 </ b> B are attached to the frame body 24 in a posture in which the lower edge is placed on the cylindrical convex edge 26 of the flange 27 and the upper end side is surrounded by the semi-cylindrical peripheral wall 40 a. It is attached.

  Holes 32 are formed in portions of the semicylindrical rotating shaft members 30A and 30B facing the peripheral wall 40a, and as shown in FIG. 6, the dividing surface 25 of the frame 24 and the semicylindrical rotating shaft member 30A. , 30B, the positioning device 40 is attached to the top plate 21 so as to face the hole 32 in a state where the divided surfaces 31 coincide with each other. As shown in FIG. 3, the positioning device 40 includes a piston pin 41 and a cylinder 42, and the piston pin 41 is constantly urged outward by a built-in spring 43. Pressure oil can be supplied from a hydraulic source (not shown) between the large diameter portion of the piston pin 41 and the side wall of the cylinder 42 from the pressure oil supply port 44 formed in the cylinder 42, and by supplying the pressure oil The piston pin 41 is in a retracted position against the spring 43, and is moved forward by being biased by the spring 43 by removing the pressure oil.

  In the forward movement position, the piston pin 41 enters the hole 32 formed in the semi-cylindrical rotary shaft members 30A and 30B, and positions the rotary shaft members 30A and 30B in the state shown in FIG. When the pressure oil is supplied and the piston moves backward, the piston pin 41 and the hole 32 are disengaged, and the rotary shaft members 30A and 30B can rotate.

  A chuck 50 is provided on the lower end side of the semi-cylindrical rotating shaft members 30A and 30B. In other words, one or more openings 33 are formed on the lower end side of the semi-cylindrical rotating shaft members 30A and 30B, and the opening 33 is engaged with the key 34 to engage with the hollow rotating shaft. A chuck piece 51 is attached so as to be movable forward and backward toward the 30 axis L. In order to ensure the return of the chuck piece 51, a spring 34a is provided. As shown in FIG. 3, the outer surface of the chuck piece 51 has two conical surfaces 52 inclined in opposite directions, and upper and lower adjustment members 54, 54 having inclined surfaces 53 that abut against the conical surfaces 52 are provided. Although it rotates simultaneously with the chuck | zipper piece 51, it arrange | positions so that it can move with the attitude | position which the slopes 52 and 53 collided in the up-down direction. The upper and lower adjustment members 54, 54 have a semi-disc shape, and semi-disc-like backup materials 55, 55 are located outside the adjustment members 54, 54. The outer surface of the adjustment member 54 and the inner surface of the backup material 55 are in contact with each other, and ball bearing grooves 56 and 57 are cut at opposing positions. As shown in FIG. 5, the groove 57 is formed so as to circulate to the back surface side of the backup material 55, and a ball bearing restraining material 58 is provided at a portion where the groove 57 does not face the outer surface of the adjustment member 54. It is attached. Ball bearings 59 are filled between the grooves 56 and 57 and between the grooves 57 and the backup material 55.

  The frame 24 includes actuators 60 and 60 that move in appropriate vertical directions at positions facing the backup materials 55 and 55, and a moving piece 61 of the actuator 60 is fixed to the backup material 55. Accordingly, when the actuator 60 is actuated to push out the moving piece 61, the upper and lower backup materials 55, 55 move in a direction close to each other, and the movement is transmitted to the adjusting member 54 via the ball bearing 59. By moving the upper and lower adjustment members 54 in a direction approaching each other, the chuck piece 51 moves forward toward the axial center line L of the hollow rotary shaft 30 (this state is shown in a half view in FIG. 3). . When the actuator 60 is operated to move the moving piece 61 in the pulling direction, the upper and lower backup members 55 and 55 move away from each other. As a result, the upper and lower adjustment members 54 and 54 move away from each other. The chuck piece 51 can be retracted to its original position (this state is shown in the right half of FIG. 3).

  In the example shown in the figure, actuators 60 and 60 that move in the vertical direction are provided, and the upper and lower adjustment members 54 and 54 move in directions close to each other, whereby the chuck piece 51 is moved along the axis L of the hollow rotary shaft 30. Although not shown, the actuator 60 and the adjustment member 54 may be either the upper side or the lower side. At this time, the conical surface 52 formed on the outer surface of the chuck piece 51 may be formed only on the surface facing the adjustment member 54.

  The rotary shaft members 30 </ b> A and 30 </ b> B integrally have a semi-disc-shaped flange 71 at a position higher than the chuck 50 by, for example, welding, and a semi-disc-shaped gear 72 is formed on the upper surface of the semi-disc-shaped flange 71. Are fixed together by screws 74. In addition, a semi-disc-shaped support member 73 is also integrally fixed to the lower surface of the flange 71 with screws 74. A semi-disc-shaped receiving member 75 is fixed to the frame body 24 so as to face the lower surface side of the support member 73, and the semi-disk-shaped receiving member 76 is made to face the upper surface side of the gear 72. It is fixed against.

  Ball bearing grooves 80 and 81 are cut in the circumferential direction so as to face the lower surface of the support member 73 and the upper surface of the receiving member 75, and the grooves 81 formed on the upper surface of the receiving member 75 have both ends thereof. In the vicinity, it wraps around the back surface side and continues to a circumferential groove 82 formed on the back surface of the receiving member 75. A ball bearing holding member 83 is attached to the groove 82, and a ball bearing 59 is filled between the grooves 80 and 81 and between the groove 82 and the ball bearing holding member 83.

  Ball bearing grooves 84 and 85 are cut in the circumferential direction so as to face the lower surface of the receiving member 76 and the upper surface of the semicircular gear 72, and the groove 85 formed on the upper surface of the gear 72 is Similar to the groove 81, it wraps around the back surface in the vicinity of both ends and continues to the circumferential groove 86 formed on the back surface of the gear 72. A ball bearing holding member 87 is also attached to the groove 86, and the ball bearing 59 is filled between the grooves 84 and 85 and between the groove 86 and the ball bearing holding member 87.

  The semi-disc-shaped members (the flange 71, the gear 72, the support member 73, the receiving member 75, the receiving member 76, etc.) are connected to the end surfaces thereof and the end surfaces 31 of the semi-cylindrical rotating shaft members 30A and 30B. Are set so as to be located on the same plane, and when the two drill head main body constituting bodies 20A and 20B are integrated, the end faces of the respective semi-disc-shaped members are in contact with each other, and are continuously It becomes a single disk shape.

  In the above configuration, when the rotary shaft members 30A and 30B (that is, the hollow rotary shaft 30) rotate, the flanges 71, the gear 72, and the support member 73 rotate simultaneously. The upper surface side of the gear 72 faces the receiving member 76 fixed on the frame body side by surface contact, and the lower surface side of the support member 73 faces the receiving member 75 also fixed on the frame body side by surface contact. However, a ball bearing 59 running in the circumferential direction is located at the two surface contact portions, and the hollow rotary shaft 30 freely rotates with respect to the fixed frame body 24 by being supported by the ball bearing 59. be able to. One of the ball bearings 59 running in the circumferential direction circulates through the back surface of the gear 72 fixed to the hollow rotary shaft 30, and the other circulates through the back surface of the receiving member 75 fixed to the frame body side. Therefore, the rotation of the hollow rotary shaft 30 is continuously and stably supported.

  A hydraulic motor 90 is installed on the top plate 21 of the frame body 24, and its rotation is transmitted to the gear 72 through gear transmission mechanisms of gears 91, 92, and 93 that constitute a speed reduction mechanism, and is transmitted to the hollow rotary shaft 30. Give rotation.

  With the above-described configuration, when working, the drill head A is lowered along the guide 3 to the state shown in FIG. The actuators 60 and 60 are operated to bring the chuck 50 into an open state (the state shown in the right side of FIG. 3), and in this state, the hydraulic piston cylinder device 14 is operated to provide two drill head main body components 20A. And 20B are in the state shown in FIG. 6, that is, the state divided into two (open). At that time, as described above, the piston pin 41 of the positioning device 40 is in the advanced position, and in both the drill head main body constituting bodies 20A and 20B, the dividing surface 25 of the frame body 24 and the semi-cylindrical rotating shaft member 30A. , 30B are in a state coincident with the dividing surface 31.

  An appropriate steel pipe (for example, a steel pipe provided with a drilling blade at the tip) 100 to be embedded in the ground is temporarily set up, and between the drill head main body constituting bodies 20A and 20B in the opened state. The steel pipe 100 is inserted into the space region and is positioned between the rotary shaft members 30A and 30B divided in the axial direction (imaginary line position in FIG. 6).

  In this state, the hydraulic piston cylinder device 14 is operated to close the two drill head main body constituting bodies 20A and 20B. 3, 4, and 5, the two semi-cylindrical rotary shaft members 30 </ b> A and 30 </ b> B come into contact with each other, and the split surfaces 31 and 31 come into contact with each other as described above. 30 and the steel pipe 100 is encased therein. Next, the vehicle B side is operated and the whole drill head A is raised along the guide 3 to an appropriate position. Usually, it raises to the upper end vicinity of the steel pipe 100 temporarily installed. At that position, the actuators 60 and 60 are operated to advance the chuck piece 51 of the chuck 50. Thereby, the steel pipe 100 is chucked and integrated with the hollow rotary shaft 30.

  Thereafter, the steel pipe is embedded in the same manner as this conventional working machine. After the vehicle B is moved to the position where the steel pipe 100 is to be embedded and the support leg B1 is lowered, pressure oil is supplied to the positioning means 40, and the engagement between the hole 32 and the piston pin 41 is released. Next, the two hydraulic motors 90 and 90 are driven. The rotation of the motor is transmitted to the gear 72 via the gears 91, 92, 93, and the two rotating shaft members 30 </ b> A, 30 </ b> B that are integrated rotate as the hollow rotating shaft 30. As described above, the gear 72 fixed to the hollow rotating shaft 30 is supported between the receiving member 75 and the receiving member 76 via the ball bearing 59, and the hollow rotating shaft 30 rotates smoothly. The steel pipe 100 gripped by the chuck 50 together with the hollow rotary shaft 30 also rotates and the drill head A is lowered, whereby the steel pipe 100 is buried in the ground while excavating.

  If the upper end of the steel pipe still remains above the drill head A when the drill head A comes to the lowest position, the rotation of the hydraulic motor 90 is stopped, the grip is released by the chuck 50, and the entire drill head A is After raising the required distance along the steel pipe 100, the chuck 50 is tightened. Then, the rotation of the hydraulic motor 90 and the lowering of the drill head A are performed again.

  When replacing the steel pipe 100, the hydraulic pressure supplied to the positioning device 40 is released with the rotation of the hydraulic motor 90 slowed. As a result, the piston pin 41 of the positioning device 40 is biased toward the hollow rotary shaft 30 by the spring 43. On the other hand, the hollow rotary shaft 30 continues to rotate slowly. During the rotation, the hole 32 formed in the hollow rotating shaft 30 and the piston pin 41 are positioned to face each other, and the biston 41 enters the hole 32. At the same time, the hydraulic motor 90 is stopped. Thereby, it stops at a predetermined position of the hollow rotating part shaft 30. As described above, the position where the biston 41 enters the hole 32 is a position where the dividing surface 25 of the frame body 24 and the dividing surface 31 of the semi-cylindrical rotating shaft members 30A and 30B coincide with each other. When the drill head A is divided by operating the hydraulic piston / cylinder device 14 after the rotation is stopped, as shown in FIG. 6, the two drill head main body constituting bodies 20A and 20B each have an opposing end surface forming one plane. And become separated. The steel pipe 100 is temporarily set up again, and the vehicle 60 is moved to the position of the steel pipe 100 by operating the actuator 60 to move the chuck piece 51 backward. Thereafter, the same operation as described above is performed.

  FIG. 7 is a view corresponding to FIG. 3 and showing a second embodiment of the drill head A according to the present invention. 7 shows only the hollow rotary shaft 30A side which is the left half of the hollow rotary shaft 30, and the right side (center shaft 20B side) is omitted, but naturally the same configuration as in FIG. It is provided on the right side. In FIG. 7, members having the same functions as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted. In the configuration shown in FIG. 7, the bearing member for supporting the rotation of the central shaft 30 is configured such that the ball bearing 59 circulates through a continuous groove in the vertical direction as in the first embodiment shown in FIGS. It differs from the first embodiment in that it circulates through a continuous groove in the horizontal direction.

  That is, in this embodiment, as in the first embodiment, the rotary shaft members 30A and 30B have a semi-disk-shaped flange 71 at a position higher than the chuck 50, and the semi-disk-shaped flange 71 A semi-circular gear 72 is integrally fixed to the upper surface of each of the upper and lower surfaces by screws 74. A semi-disc-shaped support member 73 a is also fixed to the lower surface of the flange 71 by screws 74. On the lower surface side of the support member 73a, a circumferential bearing groove 81a having a loop shape in the horizontal direction having the same shape as shown in FIG. 5 is formed. Further, a semi-disc-shaped receiving member 75a is fixed to the frame body 24 so as to face the support member 73a, and the upper surface thereof faces the bearing groove 81a so as to draw a loop in the horizontal direction. The bearing groove 82a is formed. The bearing groove 81a and the bearing groove 82a are filled with a large number of ball bearings 59 as shown in FIG.

  A bearing groove 83a that is the same as the bearing groove 82a is formed on the upper surface of the semicircular gear 72, and is also formed on the lower surface of the receiving member 76a that is fixed to the frame body 24 so as to face the semicircular gear 72. Further, a circumferential bearing groove 84a is cut so as to face the bearing groove 83a and draw a loop in the horizontal direction. A large number of ball bearings 59 are filled in the bearing groove 83a and the bearing groove 84a as well as the bearing groove 81a and the bearing groove 82a.

  As in the first embodiment, when the two hydraulic motors 90 and 90 are driven, the rotation of the motor is transmitted from the gear 72 to the flange 71 via the gears 91, 92, and 93, as in the first embodiment. The two rotating shaft members 30 </ b> A and 30 </ b> B thus rotated rotate as the hollow rotating shaft 30. Also in this embodiment, the gear 72 and the flange 71 fixed to the hollow rotary shaft 30 are rotatably supported in two upper and lower stages by a ball bearing 59 filled in a circumferential bearing groove that draws a loop in the horizontal direction. The rotating shaft 30 rotates smoothly. Other configurations and operations are the same as those of the first embodiment, and a description thereof will be omitted.

  As described above, in the apparatus of the present invention, the attachment and replacement of the steel pipe 100 to the drill head A can be performed with the drill head A placed at a low position, so that the work is easy and the center of gravity is also high. Since it is in a low position, safety is improved.

The side view which shows the state which mounted | wore the vehicle with the drill head by this invention. The side view which shows a drill head. FIG. 3 is a cross-sectional view perpendicular to the paper surface of FIG. Sectional drawing which follows the IV-IV line of FIG. Sectional drawing by the VV line | wire of FIG. The figure equivalent to FIG. 4 which shows the state which the drill head divided | segmented into two drill head main-body-part structure bodies. The figure corresponding to FIG. 3 which shows the 2nd form of a drill head.

Explanation of symbols

  DESCRIPTION OF SYMBOLS A ... Drill head, B ... Vehicle, L ... Center line of hollow rotating shaft, 1 ... Caterpillar, 2 ... Leader mast, 3 ... Guide, 10 ... Mounting part of drill head, 12 ... Guide member, 11 ... Substrate, 13 DESCRIPTION OF SYMBOLS ... Pivot shaft, 14 ... Hydraulic piston cylinder apparatus, 20 ... Drill head main-body part, 20A, 20B ... Drill head main-body structure, 21 ... Top plate, 22 ... Bottom plate, 23 ... Side wall, 24 ... Frame, 25 ... Dividing surface of frame, 26 ... cylindrical convex edge, 27 ... flange, 30 ... hollow rotating shaft, 30a, 30B ... rotating shaft member constituting hollow rotating shaft, 31 ... dividing surface of rotating shaft member, 32 ... hole , 33 ... opening, 34 ... key, 40 ... positioning device, 42 ... cylinder, 41 ... piston pin, 43 ... spring, 44 ... pressure oil supply port, 50 ... chuck, 51 ... chuck piece, 54 ... adjustment member, 55 ... Backup material, 56 ... Bo Groove for bearing, 58 ... ball bearing, 60 ... actuator, 61 ... moving piece of actuator, 71 ... half-disc flange, 72 ... semi-disc gear, 73 ... semi-disc support member, 75, 76 ... Semi-disk shaped receiving member, 80, 81, 84, 85 ... groove for ball bearing, 82 ... groove in circumferential direction, 83, 87 ... ball bearing restraining material, 90 ... hydraulic motor, 91, 92, 93 ... gear , 100 ... Steel pipe as an embedding material having a drilling blade at the tip

Claims (5)

  A hollow rotary shaft provided with a chuck for gripping the embedding material and divided in the axial direction, a chuck operating unit, a frame that rotatably supports the hollow rotary shaft, and a drive for rotationally driving the hollow rotary shaft A drill head comprising a drill head main body having a mechanism and a mounting portion for mounting the drill head main body to a guide member, the drill head main body including two hollow heads It can be divided as a component, and in a posture in which the drill head main body component is divided into two, it can be accommodated in a rotary hollow shaft into which an embedded material is divided by passing through an open region. The drill head is characterized in that in the posture, the rotational drive from the drive mechanism can be transmitted to the embedding material through a hollow rotary shaft.   Each of the two drill head main body components is attached to the mounting portion via a pivot shaft, and a telescopic actuator is interposed between the mounting portion and each drill head main body component. The drill head according to claim 1.   The drill head according to claim 1, wherein each of the two drill head main body components includes an independent drive mechanism.   Drill head body comprising: a hollow rotary shaft that is divided in the axial direction for gripping the embedded material; a frame that rotatably supports the hollow rotary shaft; and a drive mechanism that rotationally drives the hollow rotary shaft And a mounting portion for mounting the drill head main body to the guide member, the drill head main body including the hollow rotary shaft being separable as two drill head main body components. In the posture in which the drill head main body component is divided into two, it is possible to pass through the open region and accommodate the embedded material in the divided rotary hollow shaft, and in the integrated posture from the drive mechanism A drill head characterized in that the rotational drive of the drill can be transmitted to the embedding material through a hollow rotating shaft.   A drill shaft having a hollow shaft that is provided with a chuck for gripping the embedded material and is divided in the axial direction, a chuck operating section, and a frame that supports the hollow shaft, and a guide for the drill head body. A drill head having a mounting portion to be mounted on a member, wherein the drill head main body portion can be divided into two drill head main body constituent members including a hollow shaft, and two drill head main body constituent members are provided. In the divided posture, the embedded material can be accommodated in the divided hollow shaft through the open area. In the integrated posture, the embedded material is held by the chuck by the hollow shaft. Features a drill head.

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