JP2012052299A - Pile driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile driver having control means capable of easily coping even with changes of the form of a rotary driving device, the form and length of a leader and a construction member or the like.SOLUTION: A pile driver 11 press-fits the construction member underground while rotating it by the rotary driving device 18 elevated and lowered along the leader 16. The pile driver 11 includes; position detection means for detecting the elevated/lowered position of the rotary driving device in the leader; work condition setting means for setting the form of the rotary driving device, the form and length of the leader and the form of the construction member beforehand; and control means for computing the limit value of torque to be given from the rotary driving device to the construction member on the basis of the elevated/lowered position of the rotary driving device detected in the position detection means, work conditions set in the work condition setting means and the form of a drive source provided in the rotary driving device.

Description

  The present invention relates to a pile driving machine, and more particularly to a pile driving machine that press-fits into a ground while rotating a construction member such as a steel pipe pile or a screw rod with a rotary drive device that moves up and down along a leader.

  In a pile driving machine that rotates and presses construction members such as steel pipe piles into the ground with a rotary drive device that moves up and down along the leader, the hydraulic pressure supplied to the hydraulic motor of the rotary drive device according to the height of the rotary drive device relative to the leader There is known a control device that can perform rotational press-fitting efficiently while changing the load on the reader by changing the width (see, for example, Patent Document 1).

JP 2003-232038 A

  However, the control device described in Patent Document 1 is intended for a pile driving machine that uses a hydraulic motor as a drive source of a rotary drive device, and a rotary drive device that uses an electric motor as a drive source. It could not be applied to the pile driver provided.

  Therefore, the present invention can be applied to either a hydraulic motor or an electric motor as a drive source installed in the rotary drive device, and can be used for changing the type of rotary drive device, the type and length (height) of the reader, the construction member, etc. An object of the present invention is to provide a pile driving machine provided with a control means for a rotary drive device that can be easily handled.

  In order to achieve the above object, the pile driving machine according to the present invention is a pile driving machine that press-fits a construction member with a rotary drive device that moves up and down along a leader, and presses the rotary drive device in the leader. Position detection means for detecting a position, type of the rotary drive device, type and length of the reader, work condition setting means for presetting the type of construction member, and rotational drive device detected by the position detection means Calculate and display the limit value of the torque applied from the rotary drive device to the construction member based on the lift position, the work conditions set in the work condition setting means, and the type of drive source provided in the rotary drive device. And a control means.

  According to the pile driver of the present invention, optimum torque control can be performed based on the lift position of the rotary drive device, so that the leader, the leader mounting portion of the base machine, the hoisting cylinder, and the rotary drive device can be lifted and lowered. The construction member can be rotated with a large torque while preventing the guide portions (guide rails, guide gibs) and the like to be damaged from being damaged, and the working efficiency can be improved. Furthermore, by setting the type of rotary drive device such as electric or hydraulic, the type and length of the leader according to the working conditions, the type of construction member such as press fitting of the steel pipe pile or ground improvement, etc. Work can be performed in an optimum state according to work conditions.

It is a side view which shows one example of a pile driver of this invention. It is a block diagram which shows one example of a control means. It is a figure which shows an example of the relationship between the raising / lowering position of a rotational drive device, and a torque limiting value.

  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 rod attached to the rotation drive device 18 is obtained by an electric current when the drive source of the rotation drive device 18 is an electric motor, or when a hydraulic motor is used. Is provided with torque detecting means for detecting by hydraulic pressure. 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 device 31 is provided on the operation panel of the cab 21, the lift position signal 32 s of the rotary drive device 18 detected by the position detection means 32, the torque signal 33 s detected by the torque detection means 33, and so on. The various setting signals 34s set in the working condition setting means 34 and the torque setting signal 35s set in the torque setting knob 35 operated by the operator are input as input signals. As an output signal, a torque limit signal 36s calculated based on each of the signals 32s to 35s is output to the drive source control unit 36 of the rotary drive device 18, and various display signals 37s based on the input signals are operated. The data is output to the LCD 37 provided on the board.

  In normal work, only the lift position of the rotary drive device 18 is a variable, the lift position of the rotary drive device 18 detected by the position detection means, the type of the rotary drive device 18 preset by the work condition setting means, the reader 16 The torque limit value of the rotary drive device 18 is calculated and set based on various work conditions such as the type and length, and the type of construction member. That is, as shown by the straight line L in FIG. 3, the torque limit value becomes maximum (torque limit value 100%) when the rotary drive device 18 is located at the lower end of the reader 16 (elevating position 0%). When the rotation drive device 18 is positioned at the upper end portion (the lift position 100%) of the reader 16, the rotation drive device 18 is set to be minimum (for example, a torque limit value of 20 to 30%).

  At this time, when the torque setting knob is maximized, the torque limit value corresponding to the raising / lowering position of the rotary drive device 18 or a value that falls below the torque limit value by a preset ratio is set as the torque set value as the drive source of the rotary drive device 18. Is output. On the other hand, when the torque setting knob is at the intermediate position, as shown by a broken line La in FIG. 3, the torque setting value set with the torque setting knob rotates as it is within the range where the torque set with the torque setting knob is equal to or less than the torque limit value. By outputting to the drive source of the drive device 18, the construction member rotates with a constant torque, the rotation drive device 18 is positioned above the reader 16, and the torque set by the torque setting knob exceeds the torque limit value. The torque limit value is output as a torque setting value to the drive source of the rotary drive device 18 and the information is displayed on the LCD or the like. Further, even when the torque temporarily rises due to the state of the ground during work, control is performed so as not to exceed the torque limit value. Thereby, it is possible to perform the work by rotating the construction member with a large torque while preventing the leader 16 and the like from being damaged. Therefore, it is possible to efficiently perform the press-fitting work or ground improvement work of the steel pipe pile.

  The torque setting of the rotary drive device 18 can be performed by a known method. In the case of an electric rotary drive device using an electric motor as a drive source, the voltage or current of electric power supplied to the electric motor is set. In the case of a hydraulic rotary drive device using a hydraulic motor as a drive source, the pressure of hydraulic oil supplied to the hydraulic motor may be controlled. Further, the torque limit value can be set continuously (linearly) as shown in FIG. 3, but it should be set stepwise within an appropriate length of the reader 16, for example, every 1 m. You can also.

  Further, when the length of the reader 16 is changed, the length of the reader 16 is input or selected in the work condition setting means, and the position where the rotation driving device 18 is lowered to the lowermost end of the reader 16 is set as a reference position. By detecting the raising / lowering position of the rotation driving device 18, the torque limit value corresponding to the raising / lowering position of the rotation driving device 18 can be set in the same manner as described above. Furthermore, when press-fitting a steel pipe pile, the torque limit value according to the type of the steel pipe pile can be obtained by inputting the diameter of the steel pipe pile, the state of the spiral blade, etc. into the working condition setting means. Also in the ground improvement, a torque limit value corresponding to the type of the hollow rod or the excavating blade can be obtained by inputting the type of the hollow rod or the excavating blade into the work condition setting means. Further, by making it possible to select whether the rotary drive device 18 is electric or hydraulic, even when the rotary drive device is replaced depending on the situation at the site, the torque limit value can be obtained in the same manner as described above, and the reader is damaged. The work according to the drive source can be efficiently performed while preventing the above.

  Further, a forecast can be output when the torque detected by the torque detection means 33 approaches the torque limit value, or an alarm can be output when a torque exceeding the torque limit value is detected. The operator can operate the torque setting knob 35 by reading various forecasts and warnings and information displayed on the LCD 37 so as to keep the optimum working state. Further, by providing a limit switch that operates when the rotary drive device 18 is lowered to the lowermost end of the reader 16, the limit switch detects that the reference position, that is, the elevation position (height) is 0 m. can do.

  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 apparatus, 32 ... Position detection means, 33 ... Torque detection means, 34 ... Working condition setting means, 35 ... Torque setting knob, 36 ... Drive source Control unit, 37 ... LCD

Claims (1)

  In a pile driving machine that press-fits into the ground while rotating a construction member by a rotary drive device that moves up and down along the leader, position detection means for detecting the lift position of the rotary drive device in the reader, and the type of the rotary drive device A work condition setting means for presetting the type and length of the reader, the type of the construction member, a lift position of the rotary drive device detected by the position detection means, a work condition set in the work condition setting means, and A pile driving machine comprising: control means for calculating and displaying a limit value of torque applied from the rotary drive device to the construction member based on a type of drive source provided in the rotary drive device. .

Images