JP2012052300A - Pile driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile driver capable of selecting and efficiently and surely operating soil improvement and steel pipe burial.SOLUTION: The pile driver capable of selecting soil improvement work and steel pipe burial work includes: work selection means for selecting the work contents of either one of the soil improvement and the steel pipe burial at the start of work; torque setting means for setting the maximum torque of a rotary driving device corresponding to the work contents selected in the work selection means; and torque adjustment means for adjusting the torque of the rotary driving device. In the torque adjustment means, the maximum value of the torque adjustment means is set to the maximum torque calculated in the torque setting means.

Description

  The present invention relates to a pile driver, and more particularly, to a pile driver capable of switching between ground improvement work and steel pipe burying work.

  In the construction method in which steel pipe piles are buried in the ground by rotating the steel pipe piles with a rotary drive device that moves up and down along the leader and press-fitting into the ground, the steel pipe piles of the rotary drive device are selected according to the pile diameter and ground conditions. The control means for optimizing the rotational torque is used to efficiently embed the steel pipe pile (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 10-280409 JP-A-11-311080

  When the steel pipe pile is press-fitted and buried, the control means is effective, but the pile driver capable of switching between the steel pipe pile embedding and the ground improvement cannot be handled as it is. For example, in ground improvement, a drilling head is attached to the tip of a hollow rod with a diameter smaller than that of a steel pipe pile. The excavation head is rotated via the rotary drive device and the rotary drive device is lowered along the reader. Therefore, the work contents differ greatly between the embedding of the steel pipe pile and the ground improvement simply by rotating the steel pipe pile with the rotary drive device, and the strength of the hollow rod and the excavation head is lower than that of the steel pipe pile. If the torque is high, the hollow rod and the excavation head may be damaged, and the leader may be adversely affected depending on the length.

  Therefore, an object of the present invention is to provide a pile driving machine capable of selecting a ground improvement and a steel pipe burying to work efficiently and reliably.

  In order to achieve the above object, the pile driving machine of the present invention includes a rotary drive device that moves up and down along the leader, and a ground improvement operation that is performed by attaching a rod having a ground improvement excavation head attached to the lower end of the rotary drive device. And a pile driving machine capable of selecting a steel pipe burying operation in which a steel pipe pile to be press-fitted into the ground is inserted into the rotary drive device and the steel pipe pile is press-fitted into the ground. Work selection means for selecting one of the work contents, torque setting means for setting the maximum torque of the rotary drive device corresponding to the work content selected by the work selection means, and torque for adjusting the torque of the rotary drive device Adjusting means, and the torque adjusting means is characterized in that the maximum value of the torque adjusting means is set to the maximum torque set by the torque setting means.

  According to the pile driving machine of the present invention, the maximum torque corresponding to either the ground improvement selected at the start of the work or the steel pipe burial is automatically set, so the ground improvement work is performed at a high torque. Without damaging the hollow rod and the excavation head, the steel pipe burying work is performed at a low torque and the work efficiency is not lowered, and the ground improvement work and the steel pipe burying work can be performed efficiently and reliably.

It is a side view which shows one example of a pile driver of this invention. It is a front view which shows one example of a touch panel provided in the control means. It is a figure which shows an example of torque control.

  The pile driving machine 11 shown in the present embodiment includes a base machine 14 composed of a lower traveling body 12 provided with a crawler, and an upper revolving body 13 provided on the lower traveling body 12 so as to be able to swivel, and an upper turning A leader 16 provided on the front bracket 15 provided at the front of the body 13 so as to be raised and lowered, a raising and lowering cylinder 17 supporting the leader 16 from the rear, and a rotary drive device 18 provided on the leader 16 so as to be movable up and down. A lifting / lowering motor 20 that lifts and lowers the rotational drive device 18 via a lifting / lowering chain 19; an cab 21 provided in the upper swing body 13; and an equipment room 22 that houses an engine, a hydraulic unit, a generator, and the like. It has.

  Further, the lifting / lowering motor 20 disposed at the lower portion of the reader 16 detects the rotational state of the sprocket driven by the lifting / lowering motor 20 by a rotary encoder, thereby determining the lifting / lowering position of the rotation driving device 18. Position detecting means is provided for detecting the state where the rotational drive device 18 is positioned at the lowermost part of 16 on the basis of the reference. Further, the torque for rotating a construction member such as a steel pipe pile or a ground improvement hollow rod attached to the rotary drive device 18 is determined by current when the drive source of the rotary drive device 18 is an electric motor, or In the case of a hydraulic motor, torque detection means for detecting by hydraulic pressure is provided. The lift position and torque of the rotary drive device 18 detected by these detection means are transmitted to a control device (control means) 31 provided in the cab 21.

  As shown in FIG. 2, the control means 31 is provided with a touch panel 32 for performing various settings and displaying the work state. The touch panel 32 at the start of the work when the power is turned on includes work selection means. As shown, a ground improvement button 33 and a steel pipe embedding button 34 for selecting whether the work content is ground improvement or steel pipe embedding are displayed, and a setting screen button 35 for calling a screen for performing various settings. Is displayed as the initial screen. The control means 31 is set so that work cannot be started unless either the ground improvement button 33 or the steel pipe embedding button 34 is selected on this initial screen.

  Also, below the touch panel 32, an auger lifting speed adjustment dial 36 for adjusting the lifting speed of the rotation drive device 18 and an auger torque adjustment dial (torque adjustment means) 37 for adjusting the torque of the rotation drive device 18 are provided. And by turning these dials, the elevating speed of the rotary drive device 18 and the torque of the rotary drive device 18 can be adjusted. When either the ground improvement button 33 or the steel pipe embedding button 34 is selected, a screen corresponding to the ground improvement work or the steel pipe embedding work is displayed, and the ascending / descending speed of the rotary drive device 18 adjusted by the dials 36 and 37 is displayed. The set value of torque and various data during work are displayed.

  The range of torque that can be adjusted by the auger torque adjustment dial 37 is set to the maximum torque and the minimum torque corresponding to the work content selected by the torque setting means when the work content is selected on the initial screen shown in FIG. The That is, when embedding a steel pipe pile having higher strength than a hollow rod or excavation head used for ground improvement, as shown by a solid line La in FIG. 3, the auger torque adjustment dial 37 is set to the maximum value (100%). When rotating, the steel pipe pile can be rotated with the maximum torque corresponding to the capacity of the rotary drive device 18 and in the case of ground improvement with low strength, as shown by the broken line Lb in FIG. 3, the auger torque adjustment dial Even if 37 is turned to the maximum value (100%), for example, about 50% of the capability of the rotary drive device 18 is set to the maximum torque. Further, the minimum torque when the auger torque adjustment dial 37 is turned to the minimum value (0%) is appropriately set within an adjustment range corresponding to each maximum torque.

  In this way, when starting the work, when the work content is selected by the work selection means on the initial screen, the torque setting means sets the maximum torque corresponding to the selected work content. Even if the auger torque adjustment dial 37 is turned to the maximum, the work can be reliably performed at the maximum torque or less, and the hollow rod and the excavation head can be prevented from being damaged. Can work well. Further, by setting so as to change linearly with the minimum torque, the adjustment operation by the auger torque adjustment dial 37 can be easily performed.

  Further, when the raising / lowering position of the rotary drive device 18 detected by the position detecting means is located above the reader 16, the maximum torque is changed to a low value, or the rotational resistance is increased due to the ground relation, etc., and the torque detecting means. When the torque detected in (3) temporarily exceeds the maximum torque, the torque of the rotary drive device 18 can be automatically reduced.

  DESCRIPTION OF SYMBOLS 11 ... Pile driver, 12 ... Lower traveling body, 13 ... Upper turning body, 14 ... Base machine, 15 ... Front bracket, 16 ... Leader, 17 ... Lifting cylinder, 18 ... Rotary drive, 19 ... Elevating chain, 20 DESCRIPTION OF SYMBOLS ... Hydraulic motor for raising / lowering, 21 ... Operation room, 22 ... Equipment room, 31 ... Control device, 32 ... Touch panel, 33 ... Ground improvement button, 34 ... Steel pipe embedding button, 35 ... Setting screen button, 36 ... Auger raising / lowering speed adjustment dial 37 ... Auger torque adjustment dial

Claims (1)

  A rotary drive device that moves up and down along the leader, and a ground improvement work that is performed by attaching a rod with a ground excavation head attached to the lower end of the rotary drive device, and a steel pipe pile that is press-fitted into the rotary drive device into the ground. In a pile driving machine capable of selecting a steel pipe burying operation for attaching and inserting a steel pipe pile into the ground, a work selecting means for selecting one of the work contents of the ground improvement and the steel pipe burial at the start of the work, and the work Torque setting means for setting the maximum torque of the rotary drive device corresponding to the work content selected by the selection means, and torque adjustment means for setting the torque of the rotary drive device, the torque adjustment means comprising the torque adjustment The pile driving machine characterized in that the maximum value of the means is set to the maximum torque set by the torque setting means.

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