JP2014055476A - Vibration pile punching machine and engine control method therefor, and pile construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce wasteful fuel consumption of a vibration pile punching machine.SOLUTION: A vibration pile punching machine includes: a vibration exciter 5; a pile holding device 2 for holding a pile; a plurality of pumps for forcibly feeding an oil to the vibration exciter and the pile holding device 1, respectively; an engine E for driving the plurality of pumps; and engine control means. The vibration pile punching machine enables operation for driving or pulling out the pile only when the engine rotates at a prescribed revolving speed and the pressure of the pile holding device reaches a prescribed pressure. The engine control means senses that the pressure of the pile holding device reaches the prescribed pressure when the operation for driving or pulling out the pile is not performed and the engine rotates at the prescribed revolving speed during an operable period of time of the vibration pile punching machine, and thereafter reduces the revolving speed of the engine to a fuel-saving revolving speed when a predetermined time passes without instruction to start driving or pulling out the pile.

Description

  The present invention relates to a vibration pile remover, a control method for a motor that drives the vibration pile remover, and a pile construction method for driving or pulling a pile using the control method.

  The vibration pile punching machine includes a vibration generator that generates a vibration force amplitude, and uses the vibration force of the vibration generator to perform pile driving or pile extraction. The exciter is composed of, for example, a biaxial weight type and is driven by a hydraulic motor. Moreover, the pile holding device for holding a pile, a sheet pile, etc. is attached to the vibrator. The pile gripping device grips the pile by moving the movable surface relative to the fixed surface by a hydraulic cylinder. The vibration pile punching machine is provided with at least two hydraulic pumps that pump oil to each of the hydraulic motor of the exciter and the hydraulic cylinder of the pile gripping device (actually, a hydraulic pump for lubricating oil, etc.) However, since it is not directly related to the present invention, the description is omitted.)

  These hydraulic pumps are driven by a motor. Generally, the hydraulic pump is mounted on the engine itself.

  As prior art documents showing general techniques in the technical field, there are, for example, Patent Documents 1 to 4 regarding the method for controlling the excitation force of the vibrator, and for example, Patent Documents 5 and 6 regarding the structure of the pile gripping device. There is.

  Hereinafter, the hydraulic pump that drives the hydraulic motor of the vibrator is referred to as “vibrator pump”, and the hydraulic pump that drives the hydraulic cylinder of the pile gripping device is referred to as “grip pump”. In general, a vibratory pump uses a variable displacement pump that can control the discharge amount, and a gripping pump uses a constant displacement pump that cannot control the discharge amount.

  In a general form of such a vibration pile punching machine, one motor drives both the exciter pump and the gripping pump in parallel. Moreover, in the general form, the control part which operates the vibration pile punching machine whole is provided. The control unit can change the rotational speed of the engine in a range from zero which is a stopped state to a specified rotational speed at which the pile is driven or pulled out. Further, the control unit can control the discharge amount of the exciter pump. Even if the motor is rotating at the specified rotational speed, the exciter, that is, the vibration pile punching machine, does not operate unless an instruction to drive or pull out the pile is issued to the control unit.

  FIG. 7 is a diagram schematically showing an example of a conventional construction method using such a vibration pile punching machine. The horizontal axis of the upper and lower two graphs is time. The vertical axis of the upper graph is the engine speed. The vertical axis of the lower graph is the holding pressure of the pile holding device.

The example of FIG. 7 is a case of the pile drawing construction. First, in a drawing preparation process, a motor is started and it is set as a prescription | regulation rotational speed (here 1500min < ^-1 > as an example). However, at this time, the control unit is not instructed to pull out the pile.
Next, the pile gripping device grips the pile by operating the gripping pump and pumping oil to the hydraulic cylinder. When the holding pressure of the pile holding device reaches a specified pressure (detected by a pressure switch or the like), the holding is completed. Thereafter, the pile gripping device basically maintains the specified pressure until the main process of the drawing operation is completed.

  Only after it is sensed that the pile gripping device has reached the specified pressure, the exciter can be activated. That is, the vibration pile punching machine can be operated. “Making it operable” means, for example, switching an operation switch of a vibration pile punching machine provided in the control unit from a stop position to an operation position. Thereby, the exciter can be operated. Such control is a basic form in a vibration pile punching machine. In other words, the period during which the pile gripping device holds the specified pressure is the operable period of the vibration pile punching machine.

  During the operable period of the vibration pile punching machine, the control unit is instructed to pull out the pile, and the vibrator is pumped by pumping the oil to the hydraulic motor of the vibrator. Pull out. When pulling out of the pile is completed, the pile gripping device is opened and the engine is stopped.

Japanese Patent Laid-Open No. 06-294124 Japanese Patent Laid-Open No. 08-246455 JP 09-78579 A JP-A-10-298990 JP 2010-7439 A JP2012-112181A

However, the conventional construction method in the vibration pile punching machine described above has the following problems.
As shown in FIG. 7, among the operable periods of the vibration pile punching machine, the operation period in which the vibration pile punching machine actually pulls out the pile is only a part thereof. In the example of FIG. 7, the pulling is performed in two times, the period until the first pulling, the period of the drilling operation between the first and the second, and the pile after the second pulling During the fusing operation, the vibration pile punching machine is not in operation. In spite of this, the engine is rotating at a specified rotational speed throughout this period. Of course, the fuel consumed by the engine during this time is wasted.

  In view of the above situation, the present invention provides a vibration pile punching machine, a control method for the motor, and a pile construction method using the control method in a standby period in which no substantial driving or drawing work is performed. Another object of the present invention is to reduce waste of fuel consumption due to the motor continuously rotating at a specified rotational speed.

In order to achieve the above object, the present invention provides the following configuration. The numbers in parentheses are reference numerals of the drawings described later, and are attached for reference.
The aspect of the present invention includes a plurality of vibrators (5), a pile gripping device (2) for gripping the pile, and a plurality of oil pumps to the vibrator (5) and the pile gripping device (2). Pumps (P1, P2), a motor (E) for driving the plurality of pumps (P1, P2), and a control means (1) for the motor (E). ) Is rotating at a specified rotational speed and the pile driving device (10) can be operated for driving or pulling out the pile only when the pressure of the pile gripping device (2) reaches the specified pressure. )
The control means (1) of the motor (E) does not drive or pull out the pile during the operable period of the vibration pile punching machine (10), and the motor (E) is at a specified rotational speed. When the predetermined time has passed without sensing the start of driving or pulling out the pile after sensing that the pressure of the pile gripping device (2) has reached the specified pressure when rotating, The rotational speed of the engine (E) is reduced to a fuel-saving rotational speed.

Another aspect of the present invention is the pumping of oil to the vibrator (5), the pile gripping device (2) for gripping the pile, the vibrator (5) and the pile gripping device (1). A plurality of pumps (P1, P2), a motor (E) for driving the plurality of pumps (P1, P2), and a control means (1) for the motor (E). Vibrating pile punching machine that can operate for driving or pulling out piles only when (E) is rotating at a specified rotational speed and the pressure of the pile gripping device (2) reaches a specified pressure In (10),
The control means (1) of the motor (E) does not drive or pull out the pile during the operable period of the vibration pile punching machine (10), and the motor (E) is at a specified rotational speed. When the predetermined time has passed without sensing the start of driving or pulling out the pile after sensing that the pressure of the pile gripping device (2) has reached the specified pressure when rotating, The motor (E) is in a stopped state.

Still another aspect of the present invention provides oil to the vibrator (5), the pile gripping device (2) for gripping the pile, the vibrator (5) and the pile gripping device (2), respectively. A plurality of pumps (P1, P2) for pumping, and a motor (E) for driving the plurality of pumps (P1, P2), the motor (E) rotating at a specified rotational speed; In the control method of the engine (E) in the vibration pile punching machine (10) that can be operated for driving or pulling out the pile only when the pressure of the pile gripping device (2) reaches a specified pressure. ,
During the operable period of the vibration pile punching machine (10), when the pile is not driven or pulled out and the motor (E) is rotating at a specified rotational speed, the pile gripping device (2 ) When the predetermined time has passed without sensing the start of driving or pulling out piles after sensing that the pressure in () has reached the specified pressure, the rotational speed of the engine (E) is reduced to the fuel-saving rotational speed. It is characterized by being lowered to.

Still another aspect of the present invention provides oil to the vibrator (5), the pile gripping device (2) for gripping the pile, the vibrator (5) and the pile gripping device (2), respectively. A plurality of pumps (P1, P2) for pumping, and a motor (E) for driving the plurality of pumps (P1, P2), the motor (E) rotating at a specified rotational speed; In the control method of the engine (E) in the vibration pile punching machine (10) that can be operated for driving or pulling out the pile only when the pressure of the pile gripping device (2) reaches a specified pressure. ,
During the operable period of the vibration pile punching machine (10), when the pile is not driven or pulled out and the motor (E) is rotating at a specified rotational speed, the pile gripping device (2 ), When the predetermined time has passed without instructing to start driving or pulling out the pile, the motor (E) is stopped. And

  Still another aspect of the present invention is characterized in that the driving method of the above-described vibratory pile punching machine is applied to drive or pull out the pile.

  In the present invention, during the operable period of the vibration pile punching machine, after sensing that the pressure of the gripping device has reached the specified pressure when the motor is rotating at the specified rotational speed, the pile driving or pulling out is performed. When a predetermined time has passed without an instruction to start the engine, control is performed so that the rotational speed of the engine is reduced to the fuel-saving rotational speed. Alternatively, instead of lowering the rotational speed of the motor to the fuel-saving rotational speed, control is performed so as to stop the motor.

  By performing such control, during the standby period other than the operation period during which the pile is driven or pulled out, the rotational speed of the engine is reduced. Alternatively, since the engine is stopped, useless fuel consumption in the engine can be eliminated.

Fig.1 (a) is the figure which showed roughly the principal part which performs the operation | work of driving or drawing in a vibration pile punching machine, FIG.1 (b) shows the whole structure of a vibration pile punching machine roughly. It is a figure. FIG. 2 is a view schematically showing an example of a conventional construction method using the vibration pile punching machine shown in FIG. Fig. 3 shows the general relationship between the rotational speed (horizontal axis) of the engine used in the vibration pile punching machine, the axial output of the engine (left vertical axis), and the fuel consumption rate (right vertical axis). It is a graph. FIG. 4 is a flowchart showing an example of the engine speed control flow for executing an example of the construction method by the vibration pile punching machine shown in FIG. 2. FIG. 5 is a diagram schematically showing another example of the construction method using the vibration pile punching machine shown in FIG. 1. FIG. 6 is a flowchart showing an example of the engine speed control flow for executing an example of the construction method using the vibration pile punching machine shown in FIG. 5. FIG. 7 is a diagram schematically showing an example of a conventional construction method using such a vibration pile punching machine.

Embodiments of the present invention will be described below with reference to the drawings illustrating examples.
FIG. 1 is a diagram showing an example of the configuration of a vibration pile punching machine according to the present invention. Fig.1 (a) is the figure which showed roughly the principal part which performs the operation | work of driving or drawing in a vibration pile punching machine, FIG.1 (b) shows the whole structure of a vibration pile punching machine roughly. It is a figure.

  As shown in FIG. 1 (a), an exciter 5 and a pile gripping device 2 are provided in a main part that performs a driving or drawing operation in the vibration pile punching machine 10. The vibrator 5 is driven by a hydraulic motor M and is suspended by a crane or the like. A pile gripping device 2 is attached to the lower end of the vibrator 5. The pile gripping device 2 grips the head of a pile 30 such as a steel pipe pile or a steel sheet pile. In a state where the pile gripping device 2 grips the pile 30 with a specified pressure, the exciter 5 is driven by the hydraulic motor M, so that the pile 30 is driven into the soil or pulled out from the soil.

  In FIG. 1B, the oil path is indicated by a thick line with an arrow. As shown in FIG. 1B, the hydraulic circuit is configured to pump the oil in the oil tank T to a target hydraulic device by an appropriate pump and return it to the oil tank T again. Oil is pumped from the vibrator pump P1 to the hydraulic motor M of the vibrator 5. Oil is pumped from the gripping pump P2 to the hydraulic cylinder 2a of the pile gripping device 2.

The switching valve 4 on the oil passage of the pile gripping device 2 switches whether the oil from the gripping pump P2 is sent to the hydraulic cylinder 2a or returned to the oil tank T as it is. In general, in a hydraulic circuit such as the control, in order to assist the pump and hydraulic equipment and oil leakage on the circuit, the gripping pump P2 is connected to the feed side (the switching valve 4 and the hydraulic cylinder 2a). Accumulator A is installed as an energy aid.
The pressure switch 3 on the oil passage of the pile gripping device 2 outputs to the control unit 1 a function of a pressure gauge for sensing the pressure of the hydraulic cylinder 2a, that is, the gripping pressure of the pile gripping device 2, and a signal corresponding to the sensed gripping pressure. With functionality. The pressure switch 3 always functions from the start to the end of the vibration pile punching machine 10.

  The motor E drives the exciter pump P1 and the gripping pump P2 in parallel. The vibrator pump P1 and the gripping pump P2 rotate at the same rotational speed as that of the motor E, or rotate at a predetermined ratio through a gear or a pulley.

  The control unit 1 includes an electronic circuit that controls the operation of the vibration pile punching machine 10 and is also connected to an operation panel for manual operation. The electronic circuit preferably includes a microprocessor and executes the control program according to the invention. The control unit 1 transmits a control signal to the exciter pump P1, the switching valve 4, and the motor E based on the control program, and receives a sensing signal from the pressure switch 3. In FIG.1 (b), the component related to the control part 1 is shown connected with the dotted line. As functions included in the control program of the control unit 1, at least an exciter control unit 1a, a pile gripping device control unit 1b, a motor control unit 1c, and an operation switch 1d are provided, and these operate in cooperation with each other.

The vibrator control unit 1a controls the discharge amount of the vibrator pump P1. When an instruction to drive or pull out the pile is given, oil is pumped to the hydraulic motor M, and the vibrator 5 is activated.
The pile gripping device control unit 1b controls the operation of the switching valve 4. By switching the switching valve 4 to the hydraulic cylinder 2a of the pile gripping device 2, the pile gripping device 2 is opened and closed. In addition, the pile gripping device control unit 1b receives a sensing signal indicating the gripping pressure sensed by the pressure switch 3.
The motor control unit 1c controls the operation of the motor E, and can set the rotation speed in a range from zero in a stopped state to a specified rotation speed at which the pile is driven or pulled out. The motor control unit 1c includes a timer 1c1.

  The operation switch 1d includes a stop position where the vibration pile punching machine 10 is stopped and an operation position where the vibration pile punching machine 10 is operable. The operation switch 1d switches from the stop position to the operation position when receiving a notification of “completion of grip” from the pile gripping device controller 1b. When the operation switch 1d is switched to the operating position, the exciter control unit 1a can control the exciter 5 for the first time. The vibration pile punching machine 10 (i.e., the vibrator 5) does not immediately operate but can only operate if the operation switch 1d is in the operating position. The operation switch 1d becomes the stop position again when receiving a notification of “reduction of gripping pressure” from the pile gripping device control unit 1b. The period during which the operation switch 1d is in the operating position is the “operable period” of the vibration pile punching machine 10.

  FIG. 2 is a view schematically showing an example of a construction method by the vibration pile punching machine 10 shown in FIG. The horizontal axis of the upper and lower two graphs is time. The vertical axis of the upper graph is the rotational speed of the engine. The vertical axis of the lower graph is the holding pressure of the pile holding device. The description will be made with reference to FIG.

  In FIG. 2, the case of pulling out a pile is taken as an example. However, the present invention can also be applied to pile driving construction in exactly the same manner. In the case of driving-in construction, “pulling” in the following description is replaced with “driving”.

<Pullout preparation process>
At the start of construction, the operation switch 1d of the control unit 1 is in the stop position. In the drawing preparation step, first, the motor control unit 1c of the control unit 1 activates the motor E to obtain a specified rotational speed (in this example, 1500 min ⁻¹ ). When the motor E is raised to the specified rotational speed at startup, the motor E is rotated at a predetermined rotational speed (preferably a fuel saving rotational speed described later) lower than the specified rotational speed for a while. It may be increased to a specified rotational speed later.

Next, the pile gripping device controller 1b operates the gripping pump P2 to pump oil to the hydraulic cylinder 2a, so that the pile gripping device 2 grips the pile 30. The pressure switch 30 senses that the gripping pressure of the pile gripping device 2 has reached the specified pressure, and sends a sensing signal to the pile gripping device control unit 1b. The pile gripping device controller 1b that has received this sensing signal switches the switching valve 4 so that the oil from the gripping pump P2 is returned to the oil tank T. In such a case, an accumulator installed between the switching valve 4 and the hydraulic cylinder 2a acts as an auxiliary to the gripping pump, and pressure oil is supplied from the accumulator to the hydraulic cylinder 2a of the pile gripping device (energy support). ) To prevent sudden pressure drop and maintain the specified pressure for a long time.
At the same time, the gripping completion is notified to the operation switch 1d. Upon receiving this grip completion notification, the operation switch 1d changes from the “stop position” to the “driving position”. When the operation switch 1d is in the operating position, the exciter control unit 1a is enabled. From this time point, it becomes an operable period of the vibration pile punching machine 10.

  The pile holding device control unit 1b basically holds the specified pressure until the pile 30 is released after the pile holding device 2 reaches the specified pressure. In the meantime, if the pressure switch 3 senses that the pressure has dropped slightly from the specified pressure despite the assistance of energy from the accumulator, the switch valve 4 is operated to supply an amount of oil sufficient to maintain the specified pressure. Thus, the specified pressure is maintained.

  In this way, when the motor E reaches the specified rotational speed and the pile gripping device 2 reaches the specified pressure, the pile drawing operation can be started immediately. However, if the pile pull-out work is not started immediately due to various circumstances (pile positioning and measurement, pile erection work, welding, fastening or cutting work, operator meeting, etc.), It will continue to rotate at the specified rotational speed without performing a typical work. Here, among the operable periods of the vibration pile punching machine 10, a period in which the pile pulling operation is not performed is referred to as a “standby period”, and a period in which the pile pulling operation is actually performed is referred to as an “operation period”. I will do it. If the motor E continues to rotate at the specified rotational speed during the standby period, fuel is wasted. In addition, although a small amount of oil may be pumped to maintain the specified pressure of the pile gripping device 2, it is not necessary to rotate the motor E at the specified number of rotations only for that purpose, and it is almost wasted. .

  Therefore, in the present invention, after sensing that the pressure of the pile gripping device 2 has reached the specified pressure when the pile E is not pulled out and the motor E is rotating at the specified rotational speed, When a predetermined time t has passed without an instruction to start pulling out piles, control is performed to reduce the rotational speed of the engine E to “fuel saving rotational speed”. The time t is measured by the timer 1c1 of the motor control unit 1c in FIG. That is, the timer 1c1 starts measurement from the time when the pile gripping device control unit 1b receives the sensing signal of the pressure switch 3 when the pile is not pulled out and notifies the engine control unit 1c of the signal. When the time t has passed, the motor control unit 1c performs control to reduce the rotational speed of the motor E. For example, the time t is preferably 5 to 20 seconds, but is not limited to this range, and is set in consideration of the efficiency of construction.

  Here, the “fuel saving rotational speed” is the rotational speed at which the fuel consumption is minimized. This is not the same concept as the number of revolutions conventionally referred to as “idling”. The idling is the number of revolutions when the engine E is operated at an appropriate low speed at the time of start-up or the like, but this is not the number of revolutions conscious of the fuel consumption rate.

With reference to FIG. 3, “fuel saving speed” will be described. Fig. 3 shows the general relationship between the rotational speed (horizontal axis) of the engine used in the vibration pile punching machine, the axial output of the engine (left vertical axis), and the fuel consumption rate (right vertical axis). It is a graph. The operation of driving or pulling out the pile of the vibration pile punching machine is performed within the range of the rotational speed at which the shaft output of the engine is almost maximized. This is the state of the rated output of the engine. In the present invention, this is referred to as “specified rotational speed”. For example, the specified rotational speed is about 1800 min ⁻¹ in the case of an engine generator, and is in the range of 1800 to 2200 min ⁻¹ in the case of an engine mounted on a hydraulic pump. However, this numerical value is an example and is not limited.

On the other hand, the fuel consumption rate of the engine is about 220 g / kW · h at the specified rotational speed. However, when the rotational speed decreases, the fuel consumption rate also decreases, and about 200 g / kW in the vicinity of about 1400 min ^−1.・ It becomes the minimum value with h, and the fuel consumption rate rises again when the engine speed decreases. In the present invention, the rotational speed at which the fuel consumption rate is substantially minimum is referred to as “fuel-saving rotational speed”. However, the numerical value of the rotation speed is an example, and varies depending on the characteristics of each engine. Usually, the fuel-saving rotational speed is in the range of 900 to 1500 min ⁻¹ .

  Refer to FIG. 2 again. When the drawing preparation process takes time, the process waits in a state where the rotational speed of the engine is reduced to the fuel-saving rotational speed. Then, if there is an instruction to start pulling out the pile, the rotational speed of the engine is increased to the specified rotational speed. Here, “start instruction” means that a command for operating the vibration pile punching machine 10 is issued in the control unit 1 of FIG. 1. With this command, the motor control unit 1c increases the rotational speed of the motor from the fuel-saving rotational speed to the specified rotational speed. Subsequently, the vibrator pump P <b> 1 starts to feed oil to the hydraulic motor M of the vibrator 5.

<First pile drawing process>
Thus, the pile pulling-out operation is performed by operating the vibration generator 5. Here, the drawing operation means a one-step operation performed continuously. Pile pulling work is sometimes performed by pulling out the entire pile at once, but it is often performed in several steps with several interruptions. If the exciter control unit 1a stops the operation of the exciter 5 (that is, the vibration pile punching machine 10), this one step is finished. At this point, the pullout of the entire pile is not complete, but it is in the middle.

<Drilling work process>
At the time when the vibration generator 5 is stopped, the motor E is still rotating at the specified rotational speed, and the pile gripping device 2 is at the specified pressure. Therefore, the timer 1c1 starts measurement when the vibration generator 5 is stopped. And if time t passes without the instruction | indication of the start of pulling out of a pile, the rotation speed of the motor E will be reduced to a fuel-saving rotation speed. In the example of FIG. 2, an operation for making a hole for lifting the pile is performed during this standby period. In addition, there may be a meeting with the worker. Then, if there is an instruction to start pulling out the pile (by the vibrator control unit 1a in FIG. 1), the rotational speed of the engine is increased again to the specified rotational speed.

<Second pile drawing process>
When the motor speed reaches the specified speed, the pile is pulled out. In the example of FIG. 2, pulling out the entire pile is completed by this process, and the exciter control unit 1 a stops the operation of the exciter 5.

<Pile fusing work, pile unloading preparation, pile unloading process>
At the time when the vibration generator 5 is stopped, the motor E is still rotating at the specified rotational speed, and the pile gripping device 2 is at the specified pressure. Therefore, the timer 1c1 starts measurement when the vibration generator 5 is stopped. And if time t passes without the instruction | indication of the start of pulling out of a pile, the rotation speed of the motor E will be reduced to a fuel-saving rotation speed. In the example of FIG. 2, during the standby period, the steps of fusing the drawn pile, preparing for carrying out the pile, and carrying out the pile are performed. In addition, there may be a meeting with the worker. At an appropriate time in this waiting period, that is, when it is determined that the operation of the vibrator 5 is no longer necessary, first, the pile gripping device controller 2b opens the pile gripping device 2. When the opening of the pile gripping device 2 is completed, the motor E is stopped (here, since the construction is completed, the rotational speed is set to zero, and then the power source of the motor E is also turned off).

  FIG. 4 is a flowchart showing an example of the engine speed control flow for executing an example of the construction method by the vibration pile punching machine shown in FIG. 2. In addition, in FIG. 4, it demonstrates as a flow applied to any of pile driving or drawing. The description will be given with reference to FIG.

Steps S11 to S14 are a flow at startup.
First, the engine E is started (the power is turned on) and then set to the specified rotational speed (step 11). At this time, after rotating for a while at a fuel-saving rotation speed, it may be increased to a specified rotation speed. Next, the pile gripping device 2 is activated to grip the pile 30 (step S12). It is judged from the sensing signal of the pressure switch 3 whether or not the pile gripping device 2 has reached the specified pressure (step S13). When the pile gripping device 2 reaches the specified pressure, the operation switch 1d is moved from the stop position to the operation position, and the vibrator 5 or the vibration pile punching machine 10 can be operated (step S14).

Steps S <b> 21 to S <b> 28 are flows during the operable period of the vibration pile punching machine 10.
At this time, the pile driving or pulling-out operation has not been performed, and since the engine E is rotating at the specified rotational speed and the pile gripping device 2 has reached the specified pressure, measurement of the timer 1c1 is started (step S1). S21). During the measurement of the timer 1c1, it is determined whether or not an instruction to start driving or pulling out the pile has been given (step S22). If there is no instruction to start the pile driving or pulling out operation, it is determined whether or not the set time of the timer 1c1 has elapsed (step S23). If the set time has elapsed, the rotational speed of the engine E is reduced to the fuel-saving rotational speed (step S24). On the other hand, if there is an instruction to start work during the measurement of the timer 1c1, the timer measurement is stopped at that time, and the process proceeds to step S27.

  After reducing the rotational speed of the engine E to the fuel-saving rotational speed in step S24, the process waits until there is an instruction to start driving or pulling out the pile (step S25). If there is an instruction to start work, the rotational speed of the engine E is increased to a specified rotational speed (step S26).

  When the motor E reaches the specified rotational speed, the vibration pile punching machine 10 is operated to perform a continuous and constant process of driving or drawing. After the work in one step, the vibration pile punching machine 10 is stopped (step S27).

  Every time one continuous and constant process is completed, it is determined whether or not the entire process of driving or pulling out piles is completed (step S28). If the entire process is not completed, the process returns to step S21 and the above process is repeated. When the entire process is completed, the process proceeds to the end process.

  At the end, the pile holding device 2 is opened and the pile holding device 2 is stopped (step S31). Finally, the rotational speed of the engine E is set to zero, the power is turned off, and the motor E is stopped (step S32).

  FIG. 5 is a view schematically showing another example of the construction method by the vibration pile punching machine 10 shown in FIG. FIG. 5 is a view similar to FIG.

  In the example of FIG. 5, the difference from the example of FIG. 2 is that instead of the control for reducing the rotational speed of the motor E to the fuel-saving rotational speed during the operable period of the vibration pile punching machine 10, It is to perform control to make it stop. Here, the “stop state” when the motor E is stopped during the operable period of the vibration pile punching machine 10 means that the rotational speed of the motor E is zero (no fuel is consumed) and the power is on. It may be either a stopped state that is left as it is, or a stopped state in which the rotational speed of the engine E is zero (no fuel is consumed) and the power supply is off (no power is consumed). The former has the advantage of being able to quickly return from the standby time, and the latter has the advantage of being more energy saving. In the latter case, in order to maintain the pressure of the pile gripping device 2, it is possible to cope with the pressure drop of the pile gripping device 2 by providing an accumulator on the feed side of the pile gripping pump.

  The predetermined elapsed time t in the case of the example of FIG. 5 is preferably longer than that of the example of FIG. This is to prevent the standby time from being entered excessively in consideration of the ease of returning to the specified rotational speed. For example, the time t is 5 to 30 seconds. However, it is not limited to this value.

Moreover, in the example of FIG. 5, since the motor E is stopped during the standby time (in this example, the rotational speed of the motor E is zero but the power is kept on), the pile gripping device The oil for holding the specified pressure is not sent to the hydraulic cylinder 2a of No. 2, and the gripping pressure decreases from the specified pressure. In that case, only when the pressure switch 3 senses a predetermined pressure drop, the specified pressure of the pile gripping device 2 is recovered by rotating the engine E at a necessary number of revolutions. The pressure drop to be detected is, for example, about 5 to 10 kg / cm ² . In the case of offshore construction or river construction, it is preferable that the perceived pressure drop is about 5 kg / cm ² in consideration of safety in order to prevent the pile holding device from coming off due to waves or the like.

  FIG. 6 is a flowchart showing an example of the engine speed control flow for executing an example of the construction method using the vibration pile punching machine shown in FIG. 5. In addition, in FIG. 6, it demonstrates as a flow applied to both the driving | operation of piles, or drawing | extracting. The description will be given with reference to FIG.

  Of the control flow in FIG. 6, the flow at startup and at the end is the same as the control flow in FIG. 4, and thus description thereof is omitted.

Steps S <b> 201 to S <b> 210 are flows during the operable period of the vibration pile punching machine 10.
At the time of start-up, the pile is not driven or pulled out, the motor E is rotating at the specified rotational speed, and the pile gripping device 2 has reached the specified pressure, so the measurement of the timer 1c1 is started ( Step S201). During the measurement of the timer 1c1, it is determined whether or not an instruction to start driving or pulling out the pile has been given (step S202). If there is no instruction to start the pile driving or pulling out operation, it is determined whether or not the set time of the timer 1c1 has elapsed (step S203). If the set time has elapsed, the rotational speed of the engine E is set to zero and stopped (step S204). On the other hand, if there is an instruction to start work during the measurement of the timer 1c1, the timer measurement is stopped at that time, and the process proceeds to step S209.

  After stopping the engine E in step S204, it is monitored whether or not the gripping pressure of the pile gripping device 2 has decreased from the specified pressure (step S205). If the gripping pressure drops from the specified pressure to a certain extent, the engine E is moved at the necessary number of revolutions to drive only the gripping pump P2, and the oil is sent to the hydraulic cylinder 2a of the pile gripping device 2 Then, the specified pressure is recovered (step S206).

  While maintaining the prescribed pressure of the pile gripping device 2, it waits until there is an instruction to start a pile driving or pulling out operation (step S207). If there is an instruction to start work, the rotational speed of the engine E is increased to a specified rotational speed (step S208).

  When the motor E reaches the specified rotational speed, the vibration pile punching machine 10 is operated to perform a continuous and constant process of driving or drawing. After the work in one step, the vibration pile punching machine 10 is stopped (step S209).

  Every time one continuous and constant process is completed, it is determined whether or not all the steps of driving or pulling out the pile have been completed (step S210). If the entire process has not been completed, the process returns to step S201 and the above process is repeated. When the entire process is completed, the process proceeds to the end process.

Table 1 shows the result of comparing the fuel consumption of the engine in the construction example according to the present invention in FIG. 2 and the conventional construction example in FIG.
A comparison was made in the operable period of the vibration pile punching machine. The specified rotational speed of the motor was 1500 min-1, and the fuel consumption rate at this time was 26.0 liters / h. The fuel-saving rotation speed was 900 cm-1, and the fuel consumption rate at this time was 2.5 liters / h.
The operating time when the pile was actually pulled out and the other standby time were measured and recorded, the sum of the operating time and the standby time was calculated, and the fuel consumption was calculated from the fuel consumption rate.
In actual construction, it can be seen that the waiting time is very long compared to the operating time. This is partly due to the large number of human factors such as meetings. Therefore, if the motor is continuously operated at the specified rotation speed during irregular standby times, a very large amount of fuel is consumed wastefully.
In the example of Table 1, by applying the present invention, it was possible to reduce the fuel consumption to about one third as compared with the prior art.

DESCRIPTION OF SYMBOLS 1 Control part 1a Exciter control part 1b Pile gripping device control part 1c Engine control part 1d Actuation switch 2 Pile gripping apparatus 2a Hydraulic cylinder 3 Pressure switch 4 Switching valve 5 Exciter 10 Vibration pile punching machine 30 Pile M Hydraulic motor P1 Vibrator pump P2 Gripping pump E Engine
T Oil tank A Accumulator

Claims (5)

A vibrator (5), a pile gripping device (2) for gripping the pile, and a plurality of pumps (P1, P2) for pumping oil to the vibrator (5) and the pile gripping device (2), respectively ), A motor (E) for driving the plurality of pumps (P1, P2), and a control means (1) for the motor (E), wherein the motor (E) is at a specified rotational speed. In the vibration pile punching machine (10) which can be operated for driving or pulling out the pile only when the pressure of the pile gripping device (2) reaches a specified pressure.
The control means (1) of the motor (E) does not drive or pull out the pile during the operable period of the vibration pile punching machine (10), and the motor (E) is at a specified rotational speed. When the predetermined time has passed without sensing the start of driving or pulling out the pile after sensing that the pressure of the pile gripping device (2) has reached the specified pressure when rotating, A vibration pile punching machine characterized in that the rotational speed of the engine (E) is reduced to a fuel-saving rotational speed. A vibrator (5), a pile gripping device (2) for gripping the pile, and a plurality of pumps (P1, P2) for pumping oil to the vibrator (5) and the pile gripping device (1), respectively ), A motor (E) for driving the plurality of pumps (P1, P2), and a control means (1) for the motor (E), wherein the motor (E) is at a specified rotational speed. In the vibration pile punching machine (10) which can be operated for driving or pulling out the pile only when the pressure of the pile gripping device (2) reaches a specified pressure.
The control means (1) of the motor (E) does not drive or pull out the pile during the operable period of the vibration pile punching machine (10), and the motor (E) is at a specified rotational speed. When the predetermined time has passed without sensing the start of driving or pulling out the pile after sensing that the pressure of the pile gripping device (2) has reached the specified pressure when rotating, The vibration pile punching machine characterized in that the engine (E) is brought into a stopped state. A vibrator (5), a pile gripping device (2) for gripping the pile, and a plurality of pumps (P1, P2) for pumping oil to the vibrator (5) and the pile gripping device (2), respectively ) And a motor (E) that drives the plurality of pumps (P1, P2), the motor (E) is rotating at a specified rotational speed, and the pressure of the pile gripping device (2) In the control method of the engine (E) in the vibration pile punching machine (10) which can be operated for driving or pulling out the pile only when the pressure reaches the specified pressure,
During the operable period of the vibration pile punching machine (10), when the pile is not driven or pulled out and the motor (E) is rotating at a specified rotational speed, the pile gripping device (2 ) When the predetermined time has passed without sensing the start of driving or pulling out piles after sensing that the pressure in () has reached the specified pressure, the rotational speed of the engine (E) is reduced to the fuel-saving rotational speed. A control method for a motor in a vibration punching machine, wherein A vibrator (5), a pile gripping device (2) for gripping the pile, and a plurality of pumps (P1, P2) for pumping oil to the vibrator (5) and the pile gripping device (2), respectively ) And a motor (E) that drives the plurality of pumps (P1, P2), the motor (E) is rotating at a specified rotational speed, and the pressure of the pile gripping device (2) In the control method of the engine (E) in the vibration pile punching machine (10) which can be operated for driving or pulling out the pile only when the pressure reaches the specified pressure,
During the operable period of the vibration pile punching machine (10), when the pile is not driven or pulled out and the motor (E) is rotating at a specified rotational speed, the pile gripping device (2 ), When the predetermined time has passed without instructing to start driving or pulling out the pile, the motor (E) is stopped. The control method of the motor in the vibration punching machine.   A method for constructing a pile, wherein the method for controlling the motor in the vibration punching machine according to claim 3 or 4 is applied to drive or pull out the pile.

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