JP2020012267A - Pile driver - Google Patents

Abstract

To provide a pile driver having an inclination detection part which can improve the detection accuracy of the verticality of a pile without lowering the efficiency of piling work.SOLUTION: An inclination detection part 44 for detecting an inclination of a steel pipe pile 35 is arranged at a vibration stopper member 26 for bracing the steel pipe pile 35 which is rotationally driven by a working device. The inclination detection part 44 has a guide member 45 which is elastically supported to an external peripheral face of the steel pipe pile 35 so as to be capable of abutting thereon, and an inclination sensor 46 attached to the guide member 45. The guide member 45 also comprises a plurality of ball rollers 49 which are arranged apart from each other in a vertical direction and a longitudinal direction, and a coil spring 48 for holding the plurality of ball rollers 49 in a state of abutting on the external peripheral face of the steel pipe pile 35.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a pile driving machine, and more particularly, to a pile driving machine provided with an angle meter for detecting a tilt of a steel pipe pile mounted on a working device.

  In the construction using a pile driving machine, a working device such as an auger is attached to a leader standing in front of the base machine so as to be able to move up and down. Various pile construction methods, such as pile casting and cast-in-place pile construction, are being implemented. In addition, since it is necessary to properly manage the verticality (inclination state) of the pile during construction, a goniometer for detecting the inclination angle in the front-rear direction and the left-right direction is conventionally attached to the reader (for example, And Patent Document 1.).

JP-A-8-170333

  However, in the goniometer described in Patent Document 1 described above, the verticality of the pile is estimated based on the verticality of the leader due to its mounting structure. Due to the deformation, there is a problem that an error easily occurs in the verticality of the pile itself. Conversely, if the goniometer is pressed against the outer peripheral surface of the pile to measure directly to ensure detection accuracy, the construction must be interrupted each time, and the construction cannot be continued. Will happen.

  Therefore, an object of the present invention is to provide a pile driving machine including a tilt detection unit that can improve the detection accuracy of the verticality of a pile without lowering the efficiency of the pile driving operation.

  In order to achieve the above object, a pile driving machine of the present invention is provided with a working device capable of ascending and descending along a leader erected at a front part of a base machine, and is rotatably driven by the working device below the leader. In a pile driving machine provided with a sway member for holding a steel pipe pile, the sway member is provided with an inclination detecting unit for detecting the inclination of the steel pipe pile.

  In addition, the vibration-prevention member includes a pair of pivot arms mounted to be rotatable in a horizontal direction about a pivot axis at a tip of a bracket that slides along the reader, and the pair of pivot arms A connecting portion for connecting the rotating ends of the pair of rotating arms to each other is provided at the rotating end of the pair, and the pair of rotating arms connects the connecting portion with a connecting pin to hold the steel pipe pile. The pair of rotating arms are configured to be openable and closable between a held closed state and an opened state in which the connecting pins are removed to open the pair of rotating arms. Are arranged between the turning bases of the two.

  Further, the inclination detection unit is characterized by having a guide member elastically supported so as to be able to contact the outer peripheral surface of the steel pipe pile, and an inclination sensor attached to the guide member, The guide member includes a plurality of ball rollers arranged apart from each other in the up-down direction and the left-right direction, and a coil spring for holding the plurality of ball rollers in contact with the outer peripheral surface of the steel pipe pile. It is characterized by having.

  According to the present invention, since the inclination detecting unit for detecting the inclination of the steel pipe pile is provided in the detent member, the inclination can be accurately detected in a stable state while suppressing the deflection of the steel pipe pile. Verticality management can be appropriately performed. In addition, since the tilt detection unit is disposed between the rotation bases of both rotation arms in the vibration-prevention member, the inclination of the steel pipe pile can be detected in a more stable state without adversely affecting the opening / closing operation of the rotation arms. It becomes possible to do.

It is a side view of the pile driver which shows one form example of this invention. FIG. FIG. It is a principal part side view similarly. It is a principal part front view similarly. It is a principal part top view similarly. FIG. 7 is a sectional view taken along line VII-VII of FIG. 6. It is explanatory drawing which similarly shows operation | movement of a guide member. It is a perspective view of the inclination detection part similarly.

  FIG. 1 to FIG. 9 are views showing an embodiment of a pile driver according to the present invention. As shown in FIGS. 1 to 3, the pile driving machine 11 includes a lower traveling body 12 provided with a crawler 12a and an upper revolving body 13 provided on the lower traveling body 12 so as to be pivotable. A base machine 14, a leader 15 erected at the front of the upper revolving unit 13, and a leader undulating cylinder 16 for supporting the leader 15 from behind are provided. In addition, a front bracket 17 that supports the leader 15 so that the leader 15 can be raised and lowered is provided at a front portion of the upper revolving structure 13, and a pipe support member 18 that supports a hydraulic pipe is provided above the front portion of the upper revolving structure 13. ing. Further, a driver's cab 19 is provided on the right side of the upper revolving unit 13, and a device room 20 containing an engine and a hydraulic unit is provided on the left side.

  The reader 15 includes a lower reader 22 rotatably mounted on a support shaft 21 provided in the front bracket 17 in the width direction of the base machine, an intermediate reader 23 connected to an upper portion of the lower reader 22, An upper reader 24 connected to an upper part of the leader 23 is divided and formed, and the lower reader 22 is further divided and formed into a lower first member 22a and a lower second member 22b. The upper leader 24 is divided into an upper first member 24a and an upper second member 24b. These leader members are connected by upper and lower flange members, and are configured to be detachable using bolts and nuts.

  A top sheave block 25 is disposed at the upper end of the upper reader 24, and a vibration-preventing member 26 is disposed at a lower front of the lower reader 22. At the center of the front of the reader 15, a rack and pinion type elevating device is provided. A rack member 27, which is one of the products, has a pair of left and right guide pipes 28 provided continuously at the front end portions on both sides over the entire length of the reader 15.

  An auger 29 as a working device is provided with a pair of left and right guide gibs 30 slidably in contact with the guide pipes 28, and is provided with a pair of left and right pinions meshing with racks 27a provided on both sides of the rack member 27. Is driven by an auger lifting hydraulic motor to move up and down along the reader 15.

  Further, the auger 29 is inserted through the drive rod 31 so as to be rotatable and movable in the axial direction, and engages the concave groove portion of the drive rod 31 with the chuck device 32 provided below the auger 29 so that the drive rod 31 The drive rod 31 is rotated by driving the output mechanism 33 with the auger driving hydraulic motor 34 in a state where the movement in the axial direction is restricted and the square shaft portion is engaged with the output mechanism 33. When this pile driving machine 11 is used for the purpose of burying a steel pipe pile, a steel pipe pile 35 is used as a construction member, and an upper end of the steel pipe pile 35 is provided via a cap rod 36 provided at a lower end of the drive rod 31. Be linked.

  Further, as shown in an enlarged manner in FIGS. 4 to 7, the anti-vibration member 26 is attached via a bracket 37 slidably provided along the leader 15, and a vertical portion is provided on both sides of the bracket 37. The rotation shafts 38 and 39 are provided respectively, and the rotation arms 40 and 41 are rotatably attached to the both rotation shafts 38 and 39, respectively. Further, the two rotating shafts 38 and 39 are arranged in front of both side edges in the width direction of the leader 15, and the interval between them is larger than the outer diameter of the steel pipe pile 35.

  Each of the rotating arms 40 and 41 is substantially symmetrical left and right, and has rotating bases 40a and 41a rotatably connected to the rotating shafts 38 and 39, respectively, and tips of the rotating bases 40a and 41a. Formed on the side and provided with arcuate concave portions 40b and 41b, respectively, inside of which surround the outer peripheral surface of the steel pipe pile 35, and the tip portions of the pile holding portions 40c and 41c, that is, each time. The rotating ends of the moving arms 40, 41 are provided, and the rotating ends of the two pile holding portions 40c, 41c are connected to each other by the connecting pin 42, and the steel pipe pile 35 is held by the two arc-shaped concave portions 40b, 41b. There are provided connecting portions 40d and 41d to be closed.

  When the connecting portions 40d and 41d are connected to each other and the rotating arms 40 and 41 are closed, the positions of the connecting portions 40d and 41d are opposite to the bracket 37 with the center C1 of the steel pipe pile 35 interposed therebetween. Are located in Further, when the rotating arms 40 and 41 are closed, the one ends 40e and 41e of the two arc-shaped concave portions 40b and 41b are in a state of approaching each other, but the other ends 40f and 41f of the two arc-shaped concave portions 40b and 41b are When opening and closing the rotating arms 40 and 41, the opening 43 is formed so as to be separated from each other so as not to interfere with the steel pipe pile 35. In a state in which the rotating arms 40 and 41 are closed, an inclination detecting unit 44 that detects the inclination of the steel pipe pile 35 is disposed between the two rotating bases 40a and 41a.

  The inclination detection unit 44 includes a guide member 45 that can abut on the outer peripheral surface of the steel pipe pile 35, a base plate 50 for fixing the guide member 45, and an inclination sensor 46 attached to the base plate 50. Have been. The guide member 45 is formed by integrally cutting out a steel plate into a substantially E-shape, and has a pair of upper, lower, left and right arms 45a whose both ends are bent at an angle corresponding to the curvature of the outer peripheral surface of the steel pipe pile 35. ing. Further, the base plate 50 for fixing the guide member 45 is elastically supported via a plurality of coil springs 48 on a plate-like support member 47 bridged between the two rotation shafts 38 and 39 of the vibration-reducing member 26. I have.

  A ball roller 49 is provided at the tip of each arm portion 45a of the guide member 45, and the ball 49b held by the main body 49a is formed so as to freely roll on the outer peripheral surface of the steel pipe pile 35 with which it comes into contact. Have been. Thus, when all of the pair of upper and lower left and right ball rollers 49 abut on the outer peripheral surface of the steel pipe pile 35, each ball 49 b of the pair of left and right ball rollers 49 becomes approximately 120 degrees apart from the center C <b> 1 of the steel pipe pile 35. (FIG. 6). Reinforcing members 45b for preventing the arm 45a from being deformed by the load received from the ball roller 49 are welded to the upper and lower portions of the guide member 45, respectively. Further, a base plate 50 is fixed to a rear surface of a central portion of the guide member 45 with a plurality of bolts 51, and an inclination sensor 46 is screwed to the central portion of the base plate 50.

  The tilt sensor 46 is a general goniometer that detects the tilt angle using gravity, and detects the tilt angle of the steel pipe pile 35 based on the vertical direction. The output signal of the inclination sensor 46 is continuously processed by a control unit provided in the operator's cab 19, and is displayed on the display as an angle value in the front-rear direction and the left-right direction corresponding to the inclination of the steel pipe pile 35. I have.

  When assembling the inclination detecting unit 44 to the vibration-preventing member 26, the rotating arms 40 and 41 are previously opened to the outside, and the base plate 50 to which the inclination sensor 46 is attached and the supporting member 47 are mutually attached. As shown in FIG. 7, the support pins 52 are provided with play from the reader 15 side into the pair of upper, lower, left and right round holes 47 a provided in the support member 47, as shown in FIG. The distal end portion of the support pin 52 is screwed to the base plate 50 in a state where the coil spring 48 and the cylindrical collar member 53 interposed between the plate 50 and the support member 47 are integrally penetrated. Thus, the guide member 45 is cantilevered and elastically supported by the support pin 52 and the compressed coil spring 48. In this state, the upper and lower arms 45a of the guide member 45 are vertically separated from each other with the respective rotating arms 40 and 41 interposed therebetween, which hinders the opening and closing operations of the respective rotating arms 40 and 41. It is held in a position where it does not exist (FIG. 4).

  Here, the operation of the inclination detection unit 44 will be described with reference to FIGS. 8 and 9. First, in the open state in which the sway member 26 is not holding the steel pipe pile 35, as shown in FIG. 8A, a predetermined elastic force is obtained by the compressed coil spring 48, and the head of the support pin 52 is moved. The portion 52a is engaged with the peripheral edge of the round hole 47a of the support member 47, and the guide member 45 is held in a stationary state. On the other hand, in the closed state in which the steel pipe pile 35 is held, as shown in FIG. 8B, all the ball rollers 49 come into contact with the outer peripheral surface of the steel pipe pile 35 and the guide member 45 moves to the leader 15 side. , The coil spring 48 is further compressed, the head 52a of the support pin 52 is separated from the plate surface of the support member 47, and the tilting operation of the support pin 52 is performed by the clearance between the support pin 52 and the round hole 47a in the vertical and horizontal directions. Becomes possible. Thereafter, when the rotating steel pipe pile 35 is slightly tilted during construction, the guide member 45 is also tilted integrally with the steel pipe pile 35 with a degree of freedom in the directions indicated by arrows in FIGS. 8B and 9. The inclination sensor 46 outputs a signal corresponding to the inclination of the steel pipe pile 35.

  As described above, since the inclination detecting unit 44 that detects the inclination of the steel pipe pile 35 is provided in the vibration-preventing member 26, the inclination can be accurately detected in a stable state while suppressing the deflection of the steel pipe pile 35. Therefore, the verticality of the pile can be properly controlled. Further, since the tilt detecting section 44 is disposed between the turning bases 40a and 41a of the turning arms 40 and 41 in the vibration-stop member 26, the opening / closing operation of the turning arms 40 and 41 is not adversely affected. It is possible to detect the inclination of the steel pipe pile 35 in a more stable state.

  Further, since the guide member 45 to which the inclination sensor 46 is attached is elastically supported so as to be able to abut on the outer peripheral surface of the steel pipe pile 35, it is easy to make the guide member 45 coincide with the inclination of the steel pipe pile 35, and the inclination angle can be reduced. Detection accuracy can be improved. In addition, since the plurality of ball rollers 49 provided on the guide member 45 abut on the outer peripheral surface of the steel pipe pile 35, the inclination sensor 46 can be smoothly operated even when the steel pipe pile 35 is rotated. It can be performed continuously without interrupting the construction.

  Note that the present invention is not limited to the above embodiment, and the guide member may be a welded structure combining a plurality of members as long as the structure can stably contact the steel pipe pile. The shape can be appropriately changed according to the size of the pile or the like. Further, the type of the tilt sensor and its mounting position are also arbitrary. Further, as a simple configuration, a configuration without a ball roller is also possible.

  DESCRIPTION OF SYMBOLS 11 ... pile driver, 12 ... lower traveling body, 12a ... crawler, 13 ... upper revolving body, 14 ... base machine, 15 ... leader, 16 ... undulating cylinder, 17 ... front bracket, 18 ... piping support member, 19 ... operation Room, 20: equipment room, 21: support shaft, 22: lower leader, 22a: lower first member, 22b: lower second member, 23: intermediate leader, 23a: intermediate first member, 23b: intermediate second member, Reference numeral 24: Upper leader, 24a: Upper first member, 24b: Upper second member, 25: Top sheave block, 26: Detent member, 27: Rack member, 27a: Rack, 28: Guide pipe, 29: Auger, 30 ... Guide guide, 31 ... Drive rod, 32 ... Chuck device, 33 ... Output mechanism, 34 ... Auger drive hydraulic motor, 35 ... Steel pipe pile, 36 ... Cap rod, 37 ... Bracket 8, 39: rotating shaft, 40: rotating arm, 40a: rotating base, 40b: arc-shaped concave portion, 40c: pile holding portion, 40d: connecting portion, 40e: one end, 40f: other end, 41: turning Moving arm, 41a: rotating base, 41b: arc-shaped concave portion, 41c: pile holding portion, 41d: connecting portion, 41e: one end, 41f: other end, 42: connecting pin, 43: opening, 44: inclination detection Part, 45: guide member, 45a: arm, 45b: reinforcing material, 46: inclination sensor, 47: support member, 47a: round hole, 48: coil spring, 49: ball roller, 49a: body, 49b: ball, 50: Base plate, 51: Bolt, 52: Support pin, 52a: Head, 53: Color member

Claims (4)

  A pile driving device in which a working device is provided so as to be able to move up and down along a leader erected at the front of a base machine, and a vibration-reducing member for holding a steel pipe pile rotationally driven by the working device is provided below the leader. A pile driving machine, characterized in that an inclination detecting unit for detecting the inclination of the steel pipe pile is provided on the vibration-preventing member.   The oscillating member includes a pair of pivot arms mounted to be rotatable in a horizontal direction about a pivot axis at a tip end of a bracket that slides along the reader, and includes a pair of pivot arms. A connecting portion for connecting the rotating ends of the pair of rotating arms is provided at the moving end, and the pair of rotating arms hold the steel pipe pile by connecting the connecting portions with connecting pins. The pair of pivot arms are configured to be openable and closable between a closed state and an open state in which the pair of pivot arms are opened by removing the connection pin, and the tilt detection unit is configured to rotate the pair of pivot arms in the closed state. The pile driver according to claim 1, wherein the pile driver is disposed between the moving bases.   The said inclination detection part is comprised including the guide member elastically supported so that a contact with the outer peripheral surface of the said steel pipe pile was possible, and the inclination sensor attached to this guide member. The pile driver according to 1 or 2.   The guide member includes a plurality of ball rollers disposed apart from each other in the up-down direction and the left-right direction, and a coil spring for holding the plurality of ball rollers in contact with the outer peripheral surface of the steel pipe pile. The pile driver according to claim 3, wherein

Images