JP2016079613A - Rod rotary driving device and soil improvement machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rod rotary driving device capable of surely holding a rod which projects upward from a rod rotary driving device body and suppressing shake of an upper part of the rod, with a simple structure.SOLUTION: A rod rotary driving device 5 comprises a body 13 having a drive shaft in a rotatable manner which a rod 6 is inserted into and is engaged with, rod chuck means 14 which is installed under the body 13 and which can integrally rotate with the drive shaft, and rod-shake stopping means 15 which is installed in the upper part of the body 13 and which can integrally rotate with the drive shaft. The rod-shake stopping means 15 comprises a cylindrical member 21 which is provided upward from the top face of the drive shaft, a ring-shaped upper cover member 22 fastened to the top edge of the cylindrical member, and a plurality of roller members 23 arranged in the upper cover member 22 in the circumferential direction and at equal intervals and abutting the outside face of the rod 6, and the roller member 23 can rotate via a support shaft of the horizontal direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pile driving machine, and more particularly, to a rod rotation driving device that can be moved up and down along a leader erected on the front portion of a base machine, and a ground improvement machine to which the rod rotation driving device is applied.

  The ground improvement work by the ground improvement machine is carried out by installing a rod rotation drive device that can be moved up and down along the leader standing at the front of the base machine, and pushing down the rod held by the rod rotation drive device while rotating the rod. This is done by injecting the ground improvement agent while excavating with the excavator and the agitator provided at the tip. The ground can be improved deeper by adding rods, but longer rods may be used to reduce the number of rod additions and increase work efficiency.

  However, when the length of the rod is longer than the leader, the rod protruding upward from the rod rotation drive device body is shaken to generate a razor movement, and the razor movement such that the upper part of the rod is swung greatly. If this occurs in the rod, there is a risk that the rod will be loaded and the durability of the rod will be reduced, or the entire ground improvement machine will vibrate and adversely affect the work. In view of this, a rod rotation driving device is known in which rod-stabilizing means capable of suppressing the deflection of the upper portion of the rod is provided on the upper portion of the driving device main body so as not to cause a slashing motion (see, for example, Patent Document 1). ).

JP 2014-80761 A

  However, since the rod rotation driving device described in Patent Document 1 is configured to release the holding state of the rod by moving the pusher plate by the hydraulic cylinder, there is a power source for operating the hydraulic cylinder. It was necessary and complicated. In addition, since the rod is held by contacting the outer surface of the rod with four rod bracing members, the abutment with the rod becomes a point contact, and the rod is damaged by the rod bracing member when the rod rotates. There was a risk.

  Therefore, the present invention provides a rod rotation driving device that can hold the rod protruding upward from the rod rotation driving device main body reliably and suppress the deflection of the upper portion of the rod, and a ground improvement to which the rod rotation driving device is applied. The purpose is to provide a machine.

  In order to achieve the above object, a rod rotation driving device according to the present invention is a rod rotation driving device that can be moved up and down along a leader erected on the front portion of a base machine. A main body rotatably provided with a drive shaft having a rod insertion hole for inserting and engaging, a rod chuck means provided at a lower portion of the main body and rotatable integrally with the drive shaft, and provided at an upper portion of the main body, Rod driving means that can rotate integrally with the drive shaft, and the rod shaking means is fixed to a cylindrical member provided upward from the upper surface of the drive shaft and to the upper end of the cylindrical member. A ring-shaped upper cover member, and a plurality of roller members arranged on the upper cover member at equal intervals in the circumferential direction and in contact with the outer surface of the rod, It is characterized in that it is rotatable via a support shaft.

  Moreover, it is preferable that the said roller member is provided so that a movement in the radial direction of the said cylindrical member is possible.

  Furthermore, a ground improvement machine according to the present invention is a ground improvement machine provided with the rod rotation driving device described above, wherein the rod has a polygonal cross-sectional square shaft engaging with the rod insertion hole, and the square shaft. And a round shaft portion having a smaller diameter and a circular section than the portion. Moreover, it is preferable that the roller provided in the said roller member is a reverse crown shape matched with the external shape of the said round shaft part.

  According to the rod rotation driving device of the present invention, the rod protruding upward is held by the rod damming means that rotates integrally with the drive shaft, so that the deflection (slashing motion) of the rod upper portion can be suppressed. Furthermore, since the contact between the outer surface of the rod and the roller member is a line contact, the rod is not damaged when the rod rotates. In addition, since the roller member is in contact with the outer surface of the rod, it is not necessary to release the holding state when only the rod rotation driving device is moved up and down along the reader when the rod is gripped.

  Furthermore, since the roller member is provided so as to be movable in the radial direction of the cylindrical member, even if the diameters of the rectangular shaft portion and the round shaft portion of the rod are different, the rod is placed in the rod damping means. Can pass smoothly.

It is a side view of the ground improvement machine to which the rod rotation drive device which shows the 1st example of the present invention is applied. It is a partial cross section top view of the rod bracing means of a rod rotation drive device similarly. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a top view of the principal part of the rod rocking means of the rod rotation drive device which shows the 2nd form example of this invention.

  1 to 3 show a first embodiment of the rod rotation driving device of the present invention. As shown in FIG. 1, a ground improvement machine 1 to which a rod rotation driving device of the present invention is applied has a leader 3 erected at the front part of a base machine 2 having a traveling part, and the leader 3 is supported by a backstay 4. I support it. A rod rotation driving device 5 is connected to a pair of left and right guide pipes 3 a provided along the longitudinal direction of the reader 3 via a guide give 5 a and can be moved up and down by a chain 3 b spanned in the longitudinal direction of the leader 3. Is provided. A lower guide (lower chuck) 7 for guiding the rod 6 rotated by the rod rotation driving device 5 is provided below the reader 3.

  The rod 6 is longer than the leader 3, a drilling head 8 having a drilling tool 8 a and a stirring tool 8 b is attached to the lower end, and a swivel joint 9 for injecting a ground improver is provided at the upper end. In addition, one end of an extendable anti-rotation member 10 that prevents the swivel joint 9 from rotating is fixed to the rod rotation driving device 5, and the other end is attached to an attachment member provided at the upper end of the rod 6. . A grout hose 11 for supplying a ground improvement agent such as milk cement is connected to the swivel joint.

The rod 6 is in the form of a pipe having a ground improving agent injection hole extending from the swivel joint 9 to the excavation head 8 in the internal axial direction. The rod 6 includes a round shaft portion 6a having a circular cross section and a square shaft portion 6b having a polygonal cross section slightly larger in diameter than the round shaft portion 6a.

  The rod rotation drive device 5 to which the rod 6 is mounted is a drive having a motor portion 12 serving as a rotation drive source provided at an upper portion of an attachment portion connected to the guide give 5a, and a rod insertion hole through which the rod 6 is inserted and engaged. A main body 13 rotatably provided with a shaft; rod chuck means 14 provided at a lower portion of the main body 13 and rotatable integrally with the drive shaft; and a rod provided at an upper portion of the main body 13 and rotatable integrally with the drive shaft. And anti-vibration means 15.

  The drive shaft is for rotating the rod 6 around the axis, and has a rod insertion hole having a polygonal inner surface through which the square shaft portion 6b can be inserted in the axial direction and engageable in the rotation direction (circumferential direction). It is formed so as to penetrate in the vertical direction, and is held rotatably inside the main body 13 by a bearing. Further, the rod chuck means 14 regulates the movement of the rod 6 in the axial direction, and a known configuration can be adopted.

  The rod damming means 15 includes a cylindrical member 21 erected upward so as to surround the rod 6 from the upper surface of the drive shaft of the main body 13, and a ring-shaped member fixed to the upper end of the cylindrical member 21. An upper cover member 22 and roller members 23 arranged on the upper surface of the upper cover member 22 at four locations at equal intervals in the circumferential direction of the cylindrical member 21 are provided.

  Each roller member 23 is provided so that a cylindrical roller 30 can be rotated via a horizontal support shaft 31. The support shaft 31 is rotatably supported by a pair of bearing plates 33 and 33 erected on a sliding plate 32 that can slide on the upper surface of the upper cover member 22. End faces opposite to the rod 6 side of the pair of bearing plates 33 and 33 are connected by a connecting plate 34.

  Each roller member 23 includes an inner peripheral bracket 35 having a guide groove 35a that restricts the movement of the upper cover member 22 in the circumferential direction of the sliding plate 32 and guides the movement in the radial direction. The inner peripheral bracket 35 is attached to the upper cover member 22 by a bolt 36 that passes through the female screw hole 22 a of the upper cover member 22 and the elongated hole insertion hole 35 b of the inner peripheral bracket 35. The surface on the rod 6 side of the inner peripheral bracket 35 is cut out along the shape of the rod insertion hole 22 c of the upper cover member 22.

  Further, an outer peripheral bracket 37 having a guide groove 37b for restricting the movement of the upper cover member 22 of the sliding plate 32 in the circumferential direction and guiding the movement in the radial direction is provided on the outer peripheral side of the inner peripheral bracket 35. Yes. The outer peripheral bracket 37 is attached to the upper cover member 22 by bolts 38 that pass through the female screw holes 22 b of the upper cover member 22 and the elongated hole insertion holes 37 a of the outer peripheral bracket 37. The outer peripheral side surface of the outer peripheral bracket 37 has a shape along the outer shape of the upper cover member.

  A support plate 39 that is parallel to the tangential surface of the tubular member 21 is erected on the outer peripheral edge of the outer peripheral bracket 37. The support plate 39 and the connecting plate 34 are connected by a fixing pin 41 that communicates with the support plate 39, the cushion material 40, and the connecting plate 34 while sandwiching the cushion member 40. Due to the expansion and contraction of the cushion member 40, the sliding plate 32 is guided by the guide groove 35 a of the inner peripheral bracket 35 and the guide groove 37 b of the outer peripheral bracket 37, so that the roller 30 can move in the radial direction of the cylindrical member 22.

  When the roller member 23 is assembled to the upper cover member 22, first, the inner peripheral bracket 35 is attached to the upper cover member 22. Next, the sliding plate 32 to which the roller 30 is attached is inserted into the guide groove 35 a of the inner peripheral bracket 35. Then, the fixing pin 41 is inserted into the fixing pin insertion hole of the connecting plate 32, and the cushion member 40 is inserted into the fixing pin 41 protruding from the connecting plate 32. The fixing pin 41 is inserted into the fixing pin insertion hole of the support plate 39, and the outer peripheral side surface of the inner peripheral bracket 35 and the inner peripheral side surface of the outer peripheral bracket 37 are aligned with each other so as to be integrated with the support plate 39. The outer peripheral bracket 37 is attached to the upper cover member 22. Since the bolt insertion holes 35a, 37a of the inner peripheral bracket 35 and the outer peripheral bracket 37 are formed as long holes, the mounting can be adjusted so as to match the diameter of the rod 6.

  Next, a procedure for performing ground improvement work with the ground improvement machine 1 using the rod driving device 5 having the above-described configuration will be described. First, as shown in FIG. 1, at the stage where the rod driving device 5 is raised to the uppermost part of the reader 3, the rectangular shaft portion 6 b positioned at the intermediate portion in the longitudinal direction of the rod 6 is driven by the rod driving device 5. The rod 6 is inserted into the rod insertion hole of the shaft, and the rod 6 is gripped by the rod chuck means 14. Further, the rod anti-vibration means 15 is in a state where the roller 30 is in contact with the outer peripheral surface of the round shaft portion 6 a of the rod 6.

  In this state, the motor unit 12 is operated to rotate the rod 6 and the rod rotation driving device 5 is lowered along the leader 3, and from the swivel joint 9 to the excavation head 8 through the injection hole in the rod 6. Supply. As a result, the excavation and agitation stage is performed in which the excavation head 8 is pushed into the ground while the earth and sand excavated by the excavation tool 8a and the supplied ground improvement agent are agitated by the agitation tool 8b. At this time, the rod chuck means 14 and the rod damming member 15 rotate integrally with the drive shaft in the main body 13, and the roller member 23 of the rod damaging means 15 holds the rod 6 protruding upward from the main body 13. Therefore, it is possible to prevent the upper portion of the rod 6 from swinging and prevent a large razor movement from occurring.

  When the rod driving device 5 is lowered to the lower end portion of the reader 3, the lower guide 7 is operated, the round shaft portion 6a below the rectangular shaft portion 6b is gripped by the lower guide 7, and then the rod 6 is gripped by the rod chuck means 14. Release the state. At this time, the contact state of the roller 30 with the rod 6 is maintained.

  In this state, the rod rotation driving device 5 is raised, and the rectangular shaft portion 6b located at the upper end portion of the rod 6 is inserted into the rod insertion hole of the drive shaft of the main body 13 and engaged with the rod shaft. Hold the rod 6. While the rod rotation driving device 5 is raised, the roller 30 rotates while being in contact with the outer peripheral surface of the round shaft portion 6 b of the rod 6. Further, although the square shaft portion 6b has a slightly larger diameter than the round shaft portion 6a, the cushion member 40 is contracted when the rod stabilizing means 15 passes through the square shaft portion 6b positioned at the upper end portion. The roller 30 moves in the radial direction and can pass smoothly.

  The lower guide 7 is deactivated, the gripping state of the rod 6 is released, the rod rotation driving device 5 is lowered while the excavation head 8 is rotated again, the ground improvement agent is supplied, and the same excavation agitation is resumed. . When the excavation head 8 reaches a predetermined depth, the rod 6 is kept rotated, and the rod rotation driving device 5 is raised while the excavation head 8 continues stirring the earth and sand and the ground improvement agent.

  When the rod rotation driving device 5 rises to the upper end of the reader 3, the motor unit 12 is stopped, the rod 6 is gripped by the lower guide 7, the gripping state by the rod chuck means 14 is released, and the rod rotation driving device 5 is moved. The rectangular shaft portion 6b in the middle of the rod 6 in the longitudinal direction is inserted into the rod insertion hole of the drive shaft. Next, the rod 6 is gripped by the rod chuck means 14. In addition, even when descending, the contact state of the roller 30 with the rod 6 remains maintained.

  The motor unit 12 is actuated again, the rod rotation driving device 5 is raised while rotating the excavation head 8, and the excavation head 8 is pulled up to the ground while stirring the earth and ground improvement agent, and returned to the state shown in FIG. . At this time, the upper portion of the rod 6 protrudes above the main body 13, but since the rod 6 is held by the roller member 23, the upper portion of the rod 6 is prevented from shaking as in the excavation and stirring. It is possible to prevent slipping motion.

  As described above, when the upper portion of the rod 6 protrudes upward from the main body 13 of the rod rotation driving device 5, the rod 6 is held by the roller member 23 of the rod rocking means 15 provided on the upper portion of the main body 13. Thereby, it can suppress that the upper part of the rod 6 shakes and a slashing motion generate | occur | produces. As a result, the durability of the rod 6 is not lowered, the ground improvement work can be performed in a stable state, and the accompanying prevention member 10 and the grout hose 11 are not damaged.

Further, since the rod damming means 15 is provided on the upper portion of the main body 13 so as to rotate integrally with the rod 6, the holding by the rod damming means 15 does not affect the rotation of the rod 6 at all.

Further, as described above, even when only the rod rotation driving device 5 is moved up and down along the reader 3 at the time of so-called rod grip replacement, it is not necessary to release the holding state of the rod 6 by the roller member 23. Further, since the roller 30 is provided by the cushion member 40 so as to be movable in the radial direction of the cylindrical member 21, the diameter of the square shaft portion 6b and the round shaft portion 6a of the rod 6 is different. Also, the rod 6 can be smoothly passed through the rod damping means 14.

  In addition, about the shape of the roller 30, although it is set as the column-shaped thing in this embodiment, various shapes, such as a taper crown type, a radial crown type, and a reverse crown type, may be sufficient. In particular, as in the second embodiment shown in FIG. 4 (the same components as those shown in the first embodiment are given the same reference numerals), the roller 300 is attached to the round shaft portion 6a of the rod 6. When the reverse crown shape is adapted to the outer shape, the contact between the round shaft portion 6a and the roller 300 becomes a contact with a line, so that there is no possibility that the rod 6 is damaged when the rod rotates. Various materials can be used for the roller, but it is preferable that the roller is made of resin so that the rod 6 is not worn.

DESCRIPTION OF SYMBOLS 1 ... Ground improvement machine pile driving machine, 2 ... Base machine, 3 ... Leader, 3a ... Guide pipe, 3b ... Chain, 4 ... Back stay, 5 ... Rod rotation drive device, 5a ... Guide give, 6 ... Rod, 6a ... Round Shaft part, 6b ... Rectangular shaft part, 7 ... Lower guide, 8 ... Drilling head, 8a ... Drilling tool, 8b ... Stirring tool, 9 ... Swivel joint, 10 ... Anti-rotation member, 11 ... Grout hose, 12 ... Motor part , 13 ... main body, 14 ... rod chuck means, 15 ... rod anti-vibration means, 21 ... cylindrical member, 22 ... upper cover member, 22a, 22b ... female screw hole, 22c ... rod insertion hole, 23 ... roller member, 30 , 300 ... roller, 31 ... support shaft, 32 ... sliding plate, 33 ... connecting plate, 34 ... connecting plate, 35 ... inner peripheral bracket, 35a ... guide groove, 35b ... bolt insertion hole, 36 ... bolt, 37 ... outer periphery bra Tsu DOO, 37a ... bolt hole, 37b ... guide groove, 38 ... bolt, 39 ... support plate 40 ... cushion member, 41 ... fixing pin

Claims (4)

A rod rotation drive device provided so as to be movable up and down along a leader standing on the front part of the base machine,
The rod rotation driving device is
A main body rotatably provided with a drive shaft having a rod insertion hole for inserting and engaging the rod;
Rod chuck means provided at a lower portion of the main body and rotatable integrally with the drive shaft;
Provided on the upper part of the main body, comprising rod drive means that can rotate integrally with the drive shaft,
The rod steadying means
A cylindrical member provided upward from the upper surface of the drive shaft;
A ring-shaped upper cover member fixed to the upper end of the tubular member;
A plurality of roller members disposed at equal intervals in the circumferential direction on the upper cover member and abutting against the outer surface of the rod;
The roller rotation drive device according to claim 1, wherein the roller member is rotatable via a horizontal support shaft.   2. The rod rotation driving device according to claim 1, wherein the roller member is provided so as to be movable in a radial direction of the cylindrical member. A ground improvement machine comprising the rod rotation driving device according to claim 1 or 2,
2. The ground improvement machine according to claim 1, wherein the rod has a square shaft portion having a polygonal cross section engaged with the rod insertion hole, and a round shaft portion having a smaller diameter and a circular cross section than the square shaft portion.   4. The ground improvement machine according to claim 3, wherein the roller provided on the roller member has an inverted crown shape that matches the outer shape of the round shaft portion.

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