JP2018204185A - Pile press-in device, pile press in system, and pile press-in method - Google Patents

Abstract

To provide a pile press-in device to allow an output control to be flexible performed.SOLUTION: A pile press-in device is provide with: a hydraulic motor and a drive gear to rotate a chuck body; a rotational hydraulic control valve 73A to transfer driving force from a hydraulic unit 6A to a hydraulic motors 36A1 to 36A3; a rotational hydraulic control valve 73B to transfer driving force from a hydraulic unit 6B to a hydraulic motors 36B1 to 36B3; and a connection control circuit 80X to change connection states including a transmission state and a non-transmission state between rotational hydraulic control valves 73A, 73B. When the connection control circuit is in the transmission state, the driving force from the hydraulic unit 6A is transferred to hydraulic motors 36A1 to 36A3 and 36B1 to 36B3 through the rotational hydraulic control valve 73A as well as transferred to hydraulic motors 36B1 to 36B3 through the rotational hydraulic control valves 73A, 73B, and when in the non-transmission state, the driving force from the hydraulic unit 6A is transferred to the hydraulic motors 36A1 to 36A3 without transmission to the hydraulic motors 36B1 to 36B3.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pile press-fitting device, a pile press-fitting system, and a pile press-fitting method for press-fitting a pile into the ground.

  In the pile press-in construction in which the pile is press-fitted into the ground, there is a case where it is necessary to increase the output of the pile press-in device in order to improve the construction speed or to enable the press-in to the hard ground. On the other hand, if the ground is soft, construction is possible even if the output is small, and if a high-power pile press-in device is used in such a case, the power loss of the machine will increase.

  Conventionally, a pile press-fitting device capable of changing the rotation speed ratio so as to obtain an appropriate rotation speed or rotation torque according to the outer diameter of the pile or the ground condition has been proposed (for example, Patent Documents 1 to 3).

JP 2002-242183 A JP 2003-278470 A Japanese Patent No. 4472204

  However, in the conventional pile press-fitting device with variable rotation speed ratio, since the magnitude (power) of the driving force of the driving source is fixed, the limited driving force is divided between the torque and the speed. Control that meets the demand for high output could not be achieved.

  An object of the present invention is to provide a pile press-fitting device, a pile press-fitting system, and a pile press-fitting method capable of flexible output control.

  The pile press-fitting device according to one aspect of the present invention is a pile press-fitting device for press-fitting into the ground while rotating a pile, the rotating unit gripping and rotating the pile, and the rotating unit acting on the rotating unit First and second driving force applying means for applying a driving force for rotation to the means, and first transmission means for transmitting the driving force from the first power unit to the first driving force applying means. The driving force is transmitted between the second transmitting means for transmitting the driving force from the second power unit to the second driving force applying means, and between the first transmitting means and the second transmitting means. Connection means for switching a connection state including a transmission state and a non-transmission state in which no driving force is transmitted between the first transmission unit and the second transmission unit, and the connection unit is in the transmission state At some point, the driving force from the first power unit is In addition to being transmitted to the first driving force applying means via the first transmitting means, it is also transmitted to the second driving force applying means via the first transmitting means and the second transmitting means. When the connecting means is in a non-transmitting state, the driving force from the first power unit is transmitted to the first driving force applying means and not transmitted to the second driving force applying means. Have.

  With this configuration, when the connecting means is in the transmitting state, the driving force from the first power unit is transmitted to the first driving force applying means and also to the second driving force applying means. High torque can be obtained with the driving force from the power unit. On the other hand, when the connecting means is in the non-transmitting state, the driving force from the first power unit is transmitted to the first driving force applying means, and not transmitted to the second driving force applying means, but from the first power unit. High speed can be obtained with driving force. At this time, if the driving force of the second power unit is transmitted to the second driving force applying means, a high torque can be obtained while maintaining a high speed. On the other hand, if the second power unit is turned off, low torque and high speed operation is possible. Thus, according to the pile press-fitting device having the above-described configuration, high torque low speed, high torque high speed, and low torque high speed operation can be selectively performed, and more flexible output control is possible. In addition, if the pile press-fit apparatus is provided with said structure, it may be further provided with the 3rd driving force provision means, the 3rd transmission means, and the 3rd power unit.

  In the pile press-fitting device, the driving force may be transmitted by hydraulic pressure, and the first and second transmission means and the connection means include a valve capable of switching whether or not to flow oil. The first and second power units may be hydraulic units that generate hydraulic driving force.

  With this configuration, the pile can be driven to rotate by hydraulic pressure.

  In the pile press-fitting device, the first driving force application unit may include a pair of driving gears that are rotationally driven by a hydraulic motor, and the pair of driving gears sandwich the pile that is gripped by the chuck. May be in position.

  With this configuration, even when the first driving force applying unit applies a driving force to the rotating unit and the second driving force applying unit does not apply the driving force to the rotating unit, the two hydraulic motors can balance the chuck. A rotational driving force can be applied.

  In the pile press-fitting device, the first driving force application unit may include three or more driving gears that are rotationally driven by a hydraulic motor, and the three or more driving gears include the three or more driving gears. The center of the said pile may be arrange | positioned in the polygon comprised by these drive gears.

  With this configuration, even when the first driving force applying unit applies a driving force to the rotating unit and the second driving force applying unit does not apply the driving force to the rotating unit, the three hydraulic motors can balance the chuck. A rotational driving force can be applied.

  In the pile press-fitting device, the connection means may switch the connection state based on the rotational torque detected by detecting the hydraulic pressure of the hydraulic motor.

  With this configuration, the connection state of the connection means can be automatically changed to a connection state for obtaining a necessary rotational torque based on the sensor value.

  In the pile press-fitting device, the non-transmission state of the connecting means is such that the second driving force application means applies an amount of oil that can rotate with low resistance from the first power unit to the second driving force application. It may be in a state of flowing through the means.

  With this configuration, it is possible to reduce the power loss due to the high resistance of the second driving force application unit because the oil from the first power unit does not flow into the second driving force application unit.

  In the pile press-fitting device, the pile may have a tubular shape, and the rotating means may include a chuck that grips the pile and is rotatable and movable in the press-fitting direction, and the first drive The force applying means may include a hydraulic motor that rotates the chuck and a hydraulic cylinder that urges the chuck in the press-fitting direction, and the first transmission means applies a driving force from the first power unit to the hydraulic pressure. You may transmit to a motor and the said hydraulic cylinder.

  A pile press-fitting device according to another aspect of the present invention is a pile press-fitting device for press-fitting into a ground while rotating a pile, and a rotating unit that grips and rotates the pile and a power unit that acts on the rotating unit. First and second driving force applying means for applying a driving force from the power unit to the rotating means, and connecting means provided between the power unit and the second driving force applying means. A transmission state in which a driving force is transmitted to the first driving force application unit and also transmitted to the second driving force application unit, and a driving force from the power unit is transmitted to the first driving force application unit. A connection means for switching between a connection state including a non-transmission state that is transmitted and not transmitted to the second driving force applying means; and a rotational torque of the pile by the rotation means is detected, based on the detected rotational torque, And it has a configuration in which a control device for switching the connection state.

  With this configuration, appropriate output control can be performed depending on the hardness of the ground, and efficient construction can be performed without depending on the intuition of the operator.

  A pile press-in method according to an aspect of the present invention is a pile press-in method in which a pile is rotationally press-fitted using the above-described pile press-in device, and the second power unit is turned on in accordance with a rotational torque required for the rotating means. And having a configuration for switching whether to supply driving force to the second transmission means.

  When the rotational torque required for the rotating means is smaller than a first threshold value, the pile press-fitting method does not use the second power unit and puts the connecting means in the non-transmitting state. The driving force of one power unit is transmitted to the first driving force applying means, the driving force is not transmitted to the second driving force applying means, and the rotational torque required for the rotating means is the first driving force. When larger than a threshold value, the second power unit is used, and the connecting means is placed in the non-transmitting state, thereby transmitting the driving force of the first power unit to the first driving force applying means, and The driving force of the second power unit may be transmitted to the second driving force applying means.

  According to the present invention, operation in each mode of high torque low speed, high torque high speed, and low torque high speed can be selectively performed, and more flexible output control is possible.

The side view which shows the structure of the pile rotary press-fit apparatus of embodiment of this invention Plan view of the pile rotary press-fitting device shown in FIG. Overall configuration diagram of a pile press-fitting system including a pile rotary press-fitting device according to an embodiment of the present invention The figure which shows the example of the circuit of the pile press-fit system of embodiment of this invention The figure which shows the state of the circuit of the pile press-fit system in the case of drive | operating in the high torque low speed mode of embodiment of this invention. The figure which shows the state of the circuit of the pile press-fit system in the case of drive | operating in the low torque high speed mode of embodiment of this invention. The figure which shows the state of the circuit of the pile press-fit system in the case of drive | operating in the high torque high speed mode of embodiment of this invention. The top view which shows the structure of the pile rotation press-fit apparatus of the 1st modification of embodiment of this invention. The figure which shows the example of the circuit of the pile press-fit system of the 2nd modification of embodiment of this invention The figure which shows the example of the circuit of the pile press-fit system of the 3rd modification of embodiment of this invention

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below shows an example when the present invention is implemented, and the present invention is not limited to the specific configuration described below. In carrying out the present invention, a specific configuration according to the embodiment may be adopted as appropriate.

  First, with reference to FIG.1 and FIG.2, the outline | summary of the pile press-fitting apparatus of embodiment of this invention is demonstrated. In this embodiment, the pile press-fitting device is configured as a pile rotary press-fitting device that adds a rotation function to the press-fitting machine and press-fits the ground while rotating a circular steel pipe pile. The pile rotary press-fitting device according to the present embodiment self-propells the head of the completed pile and sequentially press-fits the steel pipe pile with the tip bit while using the pile (completed pile) that has been completed as a reaction force. By this construction method, it is possible to press fit into underground structures such as hard ground and concrete structures, and since no temporary pier is required, the construction period can be shortened and environment-friendly construction can be achieved.

FIG. 1 is a side view showing the configuration of the pile rotary press-fitting device, and FIG. 2 is a plan view of the pile rotary press-fitting device shown in FIG. As shown in FIGS. 1 and 2, the pile rotary press-fitting device 1 according to the present embodiment takes a reaction force on the completed pile 2B (reaction force pile) and puts a press-fit pile 2A made of a steel pipe of a predetermined length into a predetermined position. Press fit. The pile rotation press-fitting device 1 is used, for example, for revetment work and retaining wall work in which a plurality of piles 2, 2,. A press-fitted pile 2A that is press-fitted by the pile rotary press-fitting device 1 is suspended by a crane (not shown) that is movably installed in the vicinity of the pile rotary press-fitting device 1.
In the following description, in the pile 2, a pile to be press-fitted with the pile rotary press-fitting device 1 is a press-fitted pile using a reference 2 </ b> A, and an existing pile is a completed pile using a reference 2 </ b> B and is gripped by a clamp 50 described later. The completed pile 2B is called a reaction force pile.

  The pile rotary press-fitting device 1 includes a chuck 3 that detachably holds a press-fitting pile 2A (2) having a circular pipe shape, a mast 4 that supports the chuck 3 so as to be relatively movable in the up-down direction y, and a mast 4 in the longitudinal direction. and a saddle 5 that is supported so as to be movable relative to x1.

  The pile rotation press-fitting device 1 is moved (self-propelled) along the arrangement direction on the completed pile 2 </ b> B in which a plurality is arranged by the movement of the mast 4. As shown in FIG. 1, the saddle 5 includes a saddle main body 51 and a plurality of (here, three) clamps 50 depending from the saddle main body 51. The clamp 50 is configured to hold and release the completed pile 2B from the inside by a hydraulic cylinder (not shown) while being inserted inside the upper end 2a of the completed pile 2B, and the top end of the completed pile 2 (reaction force pile) It has a contact portion 50a that contacts (upper end 2a).

  The mast 4 includes a plate-like slide frame 41 provided on the saddle body 51, a mast base portion 42 provided on the slide frame 41 via a rotating portion 43, and an upper and lower rail portion provided at the front end of the mast base portion 42. 40. The mast base portion 42 is provided so as to be able to go around a rotation axis about the vertical direction y of the rotation portion 43.

  The upper and lower rail portion 40 extends in the vertical direction y. The chuck 3 is fitted to the front side of the upper and lower rail portion 40 so as to be movable up and down. At the lower end of the mast 4, mast arm portions 44, 44 projecting forward from both sides in the left-right direction x 2 are provided.

  The chuck 3 includes a chuck main body 31 and a chuck frame 32 that rotatably supports the chuck main body 31. As shown in FIG. 2, the chuck body 31 has an insertion hole through which the press-fit pile 2 </ b> A can be inserted in the vertical direction y. The chuck frame 32 is provided with a pair of elevating cylinders 33 (33A, 33B) having tips fixed to the mast arm portions 44 of the mast 4, respectively. The chuck frame 32 is slidably fitted in the vertical direction y along the vertical rail portion 40 by the expansion and contraction of the elevating cylinder 33.

  As shown in FIG. 1, the pair of elevating cylinders 33 </ b> A and 33 </ b> B are arranged with the rod extending and contracting in the vertical direction y, and the rod tip is fixed to the protruding end of the mast arm portion 44. Therefore, when the rod of the elevating cylinder 33 is contracted from the extended state, the chuck frame 32 and the chuck main body 31 are moved downward via the elevating cylinder 33, and the press-fitting pile 2A gripped by the chuck main body 31 is directed downward. Can be moved in the press-fitting direction. Thus, the elevating cylinder 33 acts on the chuck main body 31 via the chuck frame 32 to give the chuck main body 31 a driving force for press-fitting the press-fit pile 2A. A stroke sensor (not shown) for detecting the stroke of the press-fit pile 2A is provided inside the chuck frame 32.

  As shown in FIG. 2, the chuck body 31 is a portion that is rotatably supported in the chuck frame 32 and grips the press-fit pile 2 </ b> A. The chuck body 31 includes a plurality of chuck claws 311 inside. The chuck body 31 grips the press-fit pile 2 </ b> A by pressing the press-fit pile 2 </ b> A from the outer peripheral side with the chuck claws 311, and rotates with respect to the chuck frame 32. As described above, the chuck main body 31 and the chuck claws 311 rotate while gripping the press-fit pile 2A, and correspond to the rotating means of the present invention.

  A chuck rotation gear 34 is fixed to the outer periphery of the chuck body 31. Around the chuck rotation gear 34, a plurality (six in this embodiment) of drive gears 35A1, 35A2, 35A3, 35B1, 35B2, 35B3 rotatably supported by the chuck frame 32 mesh with the chuck rotation gear 34. Yes. The drive gears 35A1, 35A2, 35A3, 35B1, 35B2, and 35B3 are rotationally driven by hydraulic motors 36A1, 36A2, 36A3, 36B1, 36B2, and 36B3, respectively. The hydraulic motors 36A1, 36A2, 36A3, 36B1, 36B2, and 36B3 are fixed to the chuck frame 32 above the drive gears 35A1, 35A2, 35A3, 35B1, 35B2, and 35B3, respectively. The drive gears 35A1, 35A2, 35A3, and 35B1 , 35B2 and 35B3 are also rotatably fixed to the chuck frame 32.

  Hereinafter, the drive gears 35A1, 35A2, and 35A3 are collectively referred to as the drive gear 35A, the drive gears 35B1, 35B2, and 35B3 are collectively referred to as the drive gear 35B, and the drive gears 35A1, 35A2, 35A3, 35B1, and 35B2 , 35B3 are collectively referred to as a drive gear 35. The hydraulic motors 36A1, 36A2, and 36A3 are collectively referred to as a hydraulic motor 36A, the hydraulic motors 36B1, 36B2, and 36B3 are collectively referred to as a hydraulic motor 36B, and the hydraulic motors 36A1, 36A2, 36A3, 36B1, 36B2, 36B3 is generally referred to as a hydraulic motor 36. The same applies to other components described later.

  By rotating the drive gear 35 with the hydraulic motor 36, the chuck body 31 is rotated via the chuck rotation gear 34, whereby the press-fit pile 2A gripped by the chuck body 31 is rotated. As described above, the hydraulic motor 36 and the drive gear 35 act on the chuck body 31 via the chuck rotation gear 34 to give the chuck body 31 a rotational driving force for press-fitting the press-fit pile 2A. This corresponds to the driving force applying means of the invention. In particular, the hydraulic motor 36A and the driving gear 35A correspond to the first driving force application unit of the present invention, and the hydraulic motor 36B and the driving gear 35B correspond to the second driving force application unit of the present invention.

  Here, paying attention to the drive gear 35A, the three drive gears 35A1, 35A2, and 35A3 are such that the center of the press-fit pile 2A, that is, the chuck shaft O is included in the triangle formed by the drive gears 35A1, 35A2, and 35A3. Has been placed. Thereby, as will be described later, even when the chuck body 31 is rotationally driven only by the three drive gears 35A1, 35A2, and 35A3, the rotational drive force can be imparted to the chuck in a balanced manner by the three drive gears 35A1, 35A2, and 35A3. The hydraulic motor 36 and the drive gear 35 can be reduced in size and extended in life. The drive gear 35B is similarly arranged.

  FIG. 3 is an overall configuration diagram of a pile press-fitting system 100 including the pile rotary press-fitting device 1. The pile press-in system 100 includes a pile rotary press-in device 1, a hydraulic unit 6 as a power unit, a control device 71, a lifting hydraulic control valve 72, and a rotary hydraulic control valve 73. As will be described later, the pile press-in system 100 of the present embodiment has a plurality of combinations (two in this embodiment) of the hydraulic unit 6 and the rotary hydraulic control valve 73, but in FIG. Only the hydraulic unit 6 and the rotary hydraulic control valve 73 are shown.

  The hydraulic unit 6 and the control device 71 are connected by a power supply line 61. The hydraulic unit 6 and the rotary hydraulic control valve 73 are connected by a leak oil return line 62, an oil return line 63, a high pressure oil supply line 64, and a control line 65. The oil return line 63 and the high-pressure oil supply line 64 branch between the hydraulic unit 6 and the rotary hydraulic control valve 73 and are also connected to the elevation hydraulic control valve 72.

  A hydraulic control circuit 66 is provided between the hydraulic unit 6 and the elevation hydraulic control valve 72 and the rotary hydraulic control valve 73. The hydraulic control circuit 66 includes an electromagnetic valve corresponding to each line 62 to 65 from the hydraulic unit 6, and the flow rate of oil in each line 62 to 65 can be adjusted by adjusting the opening of the electromagnetic valve. .

  The lift hydraulic control valve 72 is further connected to the lift cylinder 33 by a high pressure oil supply line 74 and an oil return line 75. The rotary hydraulic control valve 73 is further connected to the hydraulic motor 36 by a leak oil return line 76, an oil return line 77, a high-pressure oil supply line 78, and a control line 79. Each of the hydraulic unit 6, the lift hydraulic control valve 72, the rotary hydraulic control valve 73, the lift cylinder 33, and the hydraulic motor 36 is provided with a connection port corresponding to each line.

  A high pressure oil supply line 74 between the elevating hydraulic control valve 72 and the elevating cylinder 33 is provided with a hydraulic pressure gauge 82 that detects the hydraulic pressure of the high pressure oil supply line 74. The hydraulic motor 36 is provided with a rotational torque meter 81 that detects the rotational pressure of the hydraulic motor 36.

  The control device 71 receives power supply from the hydraulic unit 6 via the power supply line 61, and based on the detected values of the hydraulic gauge 82 and the rotational torque meter 81, the hydraulic control circuit 66, the lifting hydraulic control valve 72, and the rotation The hydraulic control valve 73 is controlled. For this purpose, the oil pressure gauge 82 and the rotational torque meter 81 transmit detected values to the control device 71, respectively. The control device 71 sends the detected values to the hydraulic pressure control circuit 66, the lift hydraulic pressure control valve 72, and the rotational hydraulic pressure control valve 73. Send a control signal. In the present embodiment, the control device 71, the hydraulic pressure control circuit 66, the elevation hydraulic pressure control valve 72, the rotary hydraulic pressure control valve 73, the hydraulic pressure gauge 82, and the rotational torque gauge 81 are connected so as to be able to communicate with each other wirelessly. Instead of this, part or all of them may be communicably connected by wire.

  FIG. 4 is a diagram illustrating an example of a circuit of the pile press-fitting system 100. The pile press-fitting system 100 of the present embodiment includes two hydraulic units 6A and 6B as power units. The two hydraulic units 6A and 6B have the same specifications, and the maximum power (hydraulic pressure) that can be output is the same. The hydraulic unit 6A and the rotary hydraulic control valve 73A are connected by a leak oil return line 62A, an oil return line 63A, a high-pressure oil supply line 64A, and a control line 65A. A hydraulic control circuit 66A is provided between the hydraulic unit 6A and the rotary hydraulic control valve 73A. From the rotary hydraulic control valve 73A, a leak oil return line 76A, an oil return line 77A, a high-pressure oil supply line 78A, and a control line 79A extend, and are branched and connected to hydraulic motors 36A1, 36A2, and 36A3. Yes.

  The hydraulic unit 6B and the rotary hydraulic control valve 73B are connected by a leak oil return line 62B, an oil return line 63B, a high-pressure oil supply line 64B, and a control line 65B. A hydraulic control circuit 66B is provided between the hydraulic unit 6B and the rotary hydraulic control valve 73B. From the rotary hydraulic control valve 73B, a leak oil return line 76B, an oil return line 77B, a high-pressure oil supply line 78B, and a control line 79B extend, and are branched and connected to hydraulic motors 36B1, 36B2, and 36B3. Yes.

  The rotary hydraulic control valve 73 includes an electromagnetic valve corresponding to each line. The electromagnetic valve opens and closes according to the control signal. The oil amount is controlled by the hydraulic units 6A and 6B, but the oil amount may be adjusted by adjusting the opening of the electromagnetic valve.

  The rotary hydraulic control valve 73A is a circuit that transmits the hydraulic pressure (driving force) from the hydraulic unit 6A to the hydraulic motor 36A corresponding to the first driving force applying means, and corresponds to the first transmitting means of the present invention. The rotary hydraulic control valve 73B is a circuit that transmits the hydraulic pressure (driving force) from the hydraulic unit 6B to the hydraulic motor 36B corresponding to the second driving force applying means, and corresponds to the second transmitting means of the present invention.

  The rotary hydraulic pressure control valve 73A and the rotary hydraulic pressure control valve 73B are connected by a leak oil return line 76X, an oil return line 77X, a high pressure oil supply line 78X, and a control line 79X via a connection control circuit 80X. The connection control circuit 80X switches the connection state including a transmission state in which the rotary hydraulic control valve 73A and the rotary hydraulic control valve 73B are connected and a non-transmission state in which the rotary hydraulic control valve 73A and the rotary hydraulic control valve 73B are disconnected. Is possible. The switching of the connection state is performed by the control device 71 transmitting a control signal to the connection control circuit 80X based on the detection value of the rotational torque meter 81.

  Also for the hydraulic control circuit 66, the opening / closing control thereof is performed by the control device 71 transmitting a control signal to the hydraulic control circuit 66 based on the detected value of the rotational torque meter 81. The hydraulic unit 6A is turned off by closing the hydraulic control circuit 66A, and the hydraulic unit 6A is turned on by opening the hydraulic control circuit 66A. Further, the hydraulic unit 6B is turned off by closing the hydraulic control circuit 66B, and the hydraulic unit 6B is turned on by opening the hydraulic control circuit 66B. That is, ON / OFF of the hydraulic unit 6 is controlled by opening / closing the hydraulic control circuit 66.

  4, in the hydraulic unit 6, the rotary hydraulic control valve 73, and the hydraulic motor 36, the leak oil return lines 62A, 62B, and 76X, the oil return lines 63A, 63B, and 77X, and the high pressure oil supply lines 64A, 64B, and 78X, respectively. , And connection ports connected to the control lines 65A, 65B, and 79X are indicated by DR, P, T, and PP, respectively. The same applies to FIGS.

  Next, output control in a pile press-in method using the above-described pile press-in system 100 will be described. The control device 71 of the pile press-in system 100 of the present embodiment includes a hydraulic control circuit 66, a rotary hydraulic control valve 73, and a connection control circuit 80X according to the rotational torque and rotational speed required for the rotation of the press-fit pile 2A. Control.

  The pile press-fitting system 100 of the present embodiment operates by selecting one from three operation modes: (1) high torque low speed, (2) low torque high speed, and (3) high torque high speed. The control device 71 selects an operation mode according to the detection value of the rotational torque meter 81. Specifically, when the detected value of the rotational torque meter 81 is lower than the first threshold, the pile press-fitting system 100 selects (2) the low torque high speed mode, and the detected value of the rotational torque meter 81 is the first value. If it is higher than the threshold value of 2 (first threshold value <second threshold value), (1) the high torque low speed mode is selected, and the detected value of the rotational torque meter 81 is the first threshold value and the second threshold value. (3) The high torque high speed mode is selected.

  That is, when the detected value of the rotational torque meter 81 is higher than the first threshold value, a high torque operation is required, but among them, when the detected value of the rotational torque meter 81 is lower than the second threshold value. Since high-speed operation is possible, not the low speed but the high speed (3) high torque high speed mode is selected.

  Instead of such mode selection, the operation mode may be selected as follows. That is, the control device 71 determines whether the required rotational torque is low torque or high torque based on the detected value of the rotational torque meter 81, and the operator instructs the control device 71 about the rotational speed. May be. In this case, the control device 71 selects an operation mode according to a combination of the requested rotational torque determined based on the detected value of the rotational torque meter 81 and the requested rotational speed instructed by the operator.

  Alternatively, the operator may specify the required rotational torque and the required rotational speed for the control device 71. In this case, the pile press-fitting system 100 may not include the rotational torque meter 81, and the control device 71 selects the operation mode according to the combination of the requested rotational torque and the requested rotational speed instructed by the operator.

  FIG. 5 is a diagram showing a circuit state of the pile press-fitting system 100 when operating in (1) high torque low speed mode. In the high torque low speed mode, the hydraulic control circuit 66A is opened to turn on the hydraulic unit 6A, the hydraulic control circuit 66B is closed, and the hydraulic unit 6B is turned off. That is, in this mode, only a part (one) of the hydraulic units 6A among the plural (two) hydraulic units 6A and 6B is used.

  In this mode, based on the control signal from the control device 71, the connection control circuit 80X is set in the transmission state, and the rotary hydraulic control valve 73A connects the hydraulic unit 6A, the hydraulic motor 36A, and the connection control circuit 80X. To do. The rotation hydraulic pressure control circuit 73B connects the connection control circuit 80X and the hydraulic motor 36B. Thereby, the oil pushed away from the hydraulic unit 6A flows to the hydraulic motor 36A through the rotary hydraulic control valve 73A, and also flows to the hydraulic motor 36B via the connection control circuit 80X and the rotary hydraulic control valve 73B.

  Thus, in this mode, since the hydraulic pressure from one hydraulic unit 6A is distributed to each of the six hydraulic motors 36, high torque and low speed operation can be performed.

  FIG. 6 is a diagram showing a circuit state of the pile press-fitting system 100 when operating in (2) low torque high speed mode. In the low torque high speed mode, the hydraulic control circuit 66A is opened to turn on the hydraulic unit 6A, the hydraulic control circuit 66B is closed, and the hydraulic unit 6B is turned off. That is, only a part (one) of the hydraulic units 6A among the plural (two) hydraulic units 6A and 6B is used.

  In this mode, based on a control signal from the control device 71, the connection control circuit 80X is brought into a non-transmission state, and the rotary hydraulic control valve 73A connects the hydraulic unit 6A and the hydraulic motor 36A. As a result, the oil pushed away from the hydraulic unit 6A flows to the hydraulic motor 36A through the rotary hydraulic control valve 73A, and the driving force from the hydraulic unit 6A is transmitted only to the hydraulic motor 36.

  As described above, the connection control circuit 80X is in a non-transmission state. In this mode, in the connection control circuit 80X, the leakage oil return line 76X on the rotary hydraulic control valve 83A side is returned to the oil return on the rotary hydraulic control valve 73B side. The control line 79X on the rotary hydraulic pressure control valve 83A side is connected to the control line 79X on the rotary hydraulic pressure control valve 73B side.

  That is, the high pressure oil supply line 78X and the oil return line 77X connected to the hydraulic unit 6A are blocked by the connection control circuit 80X, and the high pressure oil from the hydraulic unit 6A is not supplied to the hydraulic motor 36B. However, by flowing an amount of oil corresponding to the charge pressure from the control line 79X on the rotary hydraulic control valve 73A side to the leak oil return line 76X on the rotary hydraulic control valve 73B side, the connection control circuit 80X becomes a free circuit, and the hydraulic motor 36B can rotate (free rotation) with low resistance. As a result, the hydraulic motor 36B can be rotated with low resistance following the rotation gear 34 driven by the hydraulic motor 36A.

  In this way, in this mode, the hydraulic pressure from one hydraulic unit 6A is distributed to each of the three hydraulic motors 36A among the six hydraulic motors 36. Therefore, compared with the high torque low speed mode shown in FIG. Thus, low torque and high speed operation can be performed.

  FIG. 7 is a diagram showing a circuit state of the pile press-fitting system 100 when operating in (3) high torque high speed mode. In the high torque high speed mode, the hydraulic control circuits 66A and 66B are both opened and the hydraulic units 6A and 6B are both turned on. That is, any of a plurality (two) of hydraulic units 6A and 6B is used.

  Based on the control signal from the control device 71, the connection control circuit 80X is brought into a non-transmission state, the rotary hydraulic control valve 73A connects the hydraulic unit 6A and the hydraulic motor 36A, and the rotary hydraulic control valve 73B 6B and the hydraulic motor 36B are connected. Thereby, the oil pushed away from the hydraulic unit 6A flows to the hydraulic motor 36A through the rotary hydraulic control valve 73A, and the oil pushed away from the hydraulic unit 6B flows into the hydraulic motor 36B through the rotary hydraulic control valve 73B.

  The connection control circuit 80X is set to the non-transmission state as described above. In this mode, unlike the low-torque high-speed mode shown in FIG. 6, it is not necessary to freely rotate either the hydraulic motor 36A or the hydraulic motor 36B. Therefore, the connection control circuit 80X has all the lines 76X, 77X, 78X, 79X is completely blocked.

  Thus, in this mode, the hydraulic pressure from the hydraulic unit 6A is distributed to each of the three hydraulic motors 36A, and the hydraulic pressure from the hydraulic unit 6B is distributed to each of the three hydraulic motors 36B. High torque equivalent to that in the high torque low speed mode and (2) high speed equivalent to the low torque high speed mode can be performed.

  As described above, in the pile press-in system 100, (1) in the high torque / low speed mode, the hydraulic unit 6B is turned off and the connection control circuit 80X is set in the transmission state, whereby the hydraulic pressure of the hydraulic unit 6A is changed to the hydraulic motor. It transmits to 36A, 36B, and drives drive gear 35A, 35B.

  Further, (2) in the low torque high speed mode, the hydraulic unit 6B is turned OFF, and the connection control circuit 80X is set to a non-transmission state (free circuit), whereby the hydraulic pressure of the hydraulic unit 6A is transmitted to the hydraulic motor 36A. Thus, the drive gear 35A is driven, and the hydraulic motor 36B is rotated freely so that the drive gear 35B is driven by the rotary gear 34 with low resistance.

  Further, (3) in the high torque high speed mode, both the hydraulic units 6A and 6B are turned ON, and the connection control circuit 80X is set in a non-transmission state (completely cut off), whereby the hydraulic pressure of the hydraulic unit 6A is transferred to the hydraulic motor 36A. This transmits the drive gear 35A and transmits the hydraulic pressure of the hydraulic unit 6B to the hydraulic motor 36B to drive the drive gear 35B.

  As described above, according to the pile press-fitting system 100 of the present embodiment, since it is possible to operate by selecting three operation modes having different combinations of rotational torque and rotational speed, more flexible output control, that is, rotational torque and rotational speed. Speed control is possible.

  The pile press-in system 100 of the present invention and the pile press-in method using the same are not limited to the above-described embodiments, and various modifications are possible. Hereinafter, modified examples will be described.

(First modification)
FIG. 8 is a plan view showing a configuration of a pile rotation press-fitting device 1 ′ of the first modification. In FIG. 8, the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted. In this modification, there are two sets of the hydraulic motor 36A and the drive gear 35A corresponding to the first driving force application means of the present invention, and the hydraulic motor 36B and the second driving force application means of the present invention There are also two sets of drive gears 35B. Since the circuit is similar to the example of FIG.

  In this modification, the two drive gears 35A1 and 35A2 corresponding to the first drive force applying means of the present invention are located at the diagonal of the press-fit pile 2A, that is, at the diagonal of the chuck body 31. The two drive gears 35B1 and 35B2 corresponding to the second drive force applying means are also located at the diagonal of the press-fit pile 2A, that is, at the diagonal of the chuck body 31. As a result, even when the chuck body 31 is rotationally driven only by the drive gears 35A1 and 35A2 corresponding to the first drive force application means, the rotational drive force is applied to the chuck body 31 with a good balance by the two drive gears 35A1 and 35A2. In addition, the hydraulic motor 36 and the drive gear 35 can be reduced in size and extended in life.

(Second modification)
FIG. 9 is a diagram illustrating an example of a circuit of a pile press-in system 100 ′ according to the second modification. In FIG. 9, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. In this modification, three sets of the hydraulic unit 6, the hydraulic control circuit 66, and the rotary hydraulic control valve 73 are provided, and the number of the drive gear 35 and the hydraulic motor 36 that rotationally drives it is the same as that of the above embodiment. Similarly, although there are six, these six drive gears 35 and hydraulic motors 36 are divided into three groups.

  The rotary hydraulic pressure control valve 73A and the rotary hydraulic pressure control valve 73B are connected by a leak oil return line 76X, an oil return line 77X, a high pressure oil supply line 78X, and a control line 79X via a connection control circuit 80X. The rotary hydraulic pressure control valve 73B and the rotary hydraulic pressure control valve 73C are connected by a leak oil return line 76Y, an oil return line 77Y, a high pressure oil supply line 78Y, and a control line 79Y via a connection control circuit 80Y. .

  The rotary hydraulic control valve 73A is connected to the two hydraulic motors 36A1, 36A2 by a leak oil return line 76A, an oil return line 77A, a high pressure oil supply line 78A, and a control line 79A. The leakage oil return line 76B, the oil return line 77B, the high-pressure oil supply line 78B, and the control line 79B are connected to the two hydraulic motors 36B1 and 36B2. The rotary hydraulic control valve 73C is connected to the leak oil return line 76C, the oil The return line 77C, the high pressure oil supply line 78C, and the control line 79C are connected to the two hydraulic motors 36C1 and 36C2.

  In this modification, for example, if the connection control circuits 80X and 80Y are in the transmission state and all six hydraulic motors 36 are driven by one hydraulic unit 6A, high torque and low speed operation is possible. When the connection control circuits 80X and 80Y are set to the non-transmission state (free circuit) and only the two hydraulic motors 36A are driven by one hydraulic unit 6A, low torque and high speed operation is possible. When the connection control circuit 80X is set to the transmission state, the connection control circuit 80Y is set to the non-transmission state (free circuit), and the hydraulic motors 36A and 36B are driven by the single hydraulic unit 6A, operation at medium torque and medium speed is possible.

  When the hydraulic control circuits 66A and 66B are opened, the hydraulic units 6A and 6B are turned on, and the connection control circuits 80X and 80Y are set in a non-transmission state (completely cut off), a medium torque high speed operation is possible. When all the hydraulic control circuits 66A, 66B, 66C are opened, all the hydraulic units 6A, 6B, 6C are turned on, and the connection control circuits 80X, 80Y are in a non-transmission state (completely shut off), high torque and high speed operation is achieved. Is possible.

  As described above, the pile press-fitting system 100 ′ of the present modification has five operation modes of high torque low speed, low torque high speed, medium torque medium speed, medium torque high speed, and high torque high speed. Accordingly, it is possible to operate by appropriately switching the operation mode. Therefore, output control can be performed more flexibly than the above embodiment. In the same manner as in this modification, four or more hydraulic units 6 may be provided, and the combination of the hydraulic motor 36 and the drive gear 35 may be divided into sets for each hydraulic unit 6.

(Third Modification)
In the above embodiment, the method of distributing the hydraulic pressure supplied from the hydraulic unit 6 to the plurality of hydraulic motors 36 for rotating the press-fit pile 2A and controlling the output (torque and speed) of the chuck 3 has been described. However, as described above, the pile press-fitting system 100 of the present embodiment includes the two lifting cylinders 33A and 33B as press-fitting means for raising and lowering the press-fitting pile 2A and press-fitting into the ground. With respect to the hydraulic pressure supplied to the elevating cylinders 33A and 33B, output (pressure input and speed) can be controlled based on the same principle as in the above embodiment.

  FIG. 10 is a diagram illustrating an example of a circuit of a pile press-in system 100 ″ according to a third modification. In FIG. 10, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. The pile press-fitting system 100 ″ of this modification includes two hydraulic units 6A and 6B. The hydraulic unit 6A and the elevation hydraulic control valve 71A are connected by an oil return line 63A and a high-pressure oil supply line 64A. A hydraulic control circuit 66A is provided between the hydraulic unit 6A and the elevation hydraulic control valve 71A. The lift hydraulic control valve 71A and the lift cylinder 33A are connected by a high pressure oil supply line 74A and an oil return line 75A.

  The hydraulic unit 6B and the elevation hydraulic control valve 71B are connected by an oil return line 63B and a high pressure oil supply line 64B. A hydraulic control circuit 66B is provided between the hydraulic unit 6B and the elevation hydraulic control valve 71B. The lift hydraulic control valve 71B and the lift cylinder 33B are connected by a high pressure oil supply line 74B and an oil return line 75B.

  The lifting hydraulic control valve 71A is a circuit that transmits the hydraulic pressure (driving force) from the hydraulic unit 6A to the lifting cylinder 33A, and the lifting hydraulic control valve 71B transfers the hydraulic pressure (driving force) from the hydraulic unit 6B to the lifting cylinder 33B. It is a circuit to transmit.

  The elevation hydraulic control valve 71A and the elevation hydraulic control valve 71B are connected by an oil return line 77Z and a high pressure oil supply line 78Z via a connection control circuit 80Z. The connection control circuit 80Z switches the connection state including a transmission state in which the elevation hydraulic control valve 71A and the elevation hydraulic control valve 71B are connected and a non-transmission state in which the elevation hydraulic control valve 71A and the elevation hydraulic control valve 71B are disconnected. Is possible. The connection state is switched by the control device 71 based on the detected value of the oil pressure gauge 82.

  Also for the hydraulic control circuit 66, the opening / closing control thereof is performed by the control device 71 based on the detection value of the hydraulic gauge 82. The hydraulic unit 6A is turned off by closing the hydraulic control circuit 66A, and the hydraulic unit 6A is turned on by opening the hydraulic control circuit 66A. Further, the hydraulic unit 6B is turned off by closing the hydraulic control circuit 66B, and the hydraulic unit 6B is turned on by opening the hydraulic control circuit 66B. That is, ON / OFF of the hydraulic unit 6 is controlled by opening / closing the hydraulic control circuit 66.

  The pile press-fitting system 100 ″ of the present modification is similar to the control of the rotation output in the above-described embodiment for raising and lowering the chuck main body 31 and the press-fitting pile 2A held by the chuck main body 31 and the high torque low speed mode. There are three operation modes: speed mode and high torque high speed mode. Since the operations of the hydraulic control circuits 66A and 66B and the connection control circuit 80Z in each mode are the same as those in the above embodiment, the description thereof is omitted. However, in this modified example, unlike the connection control circuit 80X of the above-described embodiment, it is not necessary to use a free circuit for flowing an amount of oil corresponding to the charge pressure in the non-transmission state. It is sufficient to completely block the flow.

  This modification can be adopted together with the above-described embodiment of output control of the plurality of hydraulic motors 36 or a modification thereof, and the above-described embodiment and modifications thereof can be adopted for the output control of the hydraulic motor 36. Instead, the present modification may be adopted alone. In addition, when employ | adopting this modification independently, this invention is applicable also when press-fitting a non-circular pile with the pile press-fitting apparatus of the type which does not rotate a pile.

  1: Pile rotation press-fitting device, 2: Pile, 2A: Press-fit pile, 2B: Completed pile, 3: Chuck, 4: Mast, 5: Saddle, 31: Chuck body, 311: Chuck claw, 32: Chuck frame, 33: Lifting cylinder, 34: rotating gear, 35: driving gear, 36: hydraulic motor, 40: upper and lower rail section, 41: slide frame, 42: mast base section, 43: rotating section, 44: mast arm section, 50: clamp, 51: Saddle body 61: Power supply line 62: Leak oil return line 63: Oil return line 64: High pressure oil supply line 65: Control line 66: Hydraulic control circuit 71: Control device 72: Lift Hydraulic control valve, 73: Rotary hydraulic control valve, 74: High pressure oil supply line, 75: Oil return line, 76: Leak oil return line, 77: Oil return line, 78: High pressure oil supply Line 79: Control Line 80: connection control circuit, 81: rotary torque meter, 82: pressure gauge, 100, 100, 100 ': Pile pressed System

Claims (10)

A pile press-fitting device for press-fitting into the ground while rotating the pile,
Rotating means for gripping and rotating the pile;
First and second driving force applying means that act on the rotating means to apply a driving force for the rotation to the rotating means;
First transmission means for transmitting the driving force from the first power unit to the first driving force applying means;
Second transmission means for transmitting the driving force from the second power unit to the second driving force applying means;
A transmission state in which driving force is transmitted between the first transmission unit and the second transmission unit, and non-transmission in which driving force is not transmitted between the first transmission unit and the second transmission unit Connection means for switching the connection state including the state;
With
When the connection means is in the transmission state, the driving force from the first power unit is transmitted to the first driving force application means through the first transmission means and the first transmission. Transmitted to the second driving force applying means via the means and the second transmitting means,
When the connecting means is in a non-transmitting state, the driving force from the first power unit is transmitted to the first driving force applying means and not transmitted to the second driving force applying means.
Pile press-fitting device. The driving force is transmitted by hydraulic pressure,
The first and second transmission means and the connection means include a valve capable of switching whether or not oil flows.
The first and second power units are hydraulic units that generate hydraulic driving force.
The pile press-fitting device according to claim 1. The first driving force applying means includes a pair of driving gears that are rotationally driven by a hydraulic motor,
The pair of drive gears are located at positions sandwiching the pile gripped by the chuck,
The pile press-fitting device according to claim 2. The first driving force applying means includes three or more driving gears that are rotationally driven by a hydraulic motor,
The three or more drive gears are arranged so that the center of the pile is included in a polygon formed by the three or more drive gears.
The pile press-fitting device according to claim 2.   The pile press-fitting device according to claim 3 or 4, wherein the connection means switches the connection state based on rotational torque detected by detecting hydraulic pressure of a hydraulic motor.   The non-transmission state of the connecting means is a state in which an amount of oil that allows the second driving force applying means to rotate with low resistance flows from the first power unit to the second driving force applying means. The pile press-fitting device according to any one of claims 3 to 5. The pile has a tubular shape;
The rotating means includes a chuck that grips the pile and is rotatable and movable in a press-fitting direction,
The first driving force applying means includes a hydraulic motor that rotates the chuck and a hydraulic cylinder that urges the chuck in the press-fitting direction,
The first transmission means transmits a driving force from the first power unit to the hydraulic motor and the hydraulic cylinder;
The pile press-fitting device according to claim 2. A pile press-fitting device for press-fitting into the ground while rotating the pile,
Rotating means for gripping and rotating the pile;
First and second driving force applying means that act on the rotating means to apply a driving force from a power unit to the rotating means;
A connecting means provided between the power unit and the second driving force applying means, wherein the driving force from the power unit is transmitted to the first driving force applying means, and the second driving force is provided. A connection state including a transmission state that is also transmitted to the applying unit and a non-transmission state that transmits the driving force from the power unit to the first driving force applying unit and is not transmitted to the second driving force applying unit is switched. Connection means;
When detecting the rotational torque of the pile by the rotating means, based on the detected rotational torque, a control device that switches the connection state;
Pile press-fitting device with A pile press-in method for rotary press-fitting a pile using the pile press-in device according to claim 1,
A pile press-fitting method for switching whether to supply a driving force to the second transmission means using the second power unit according to a rotational torque required for the rotation means. When the rotational torque required for the rotating means is smaller than the first threshold value, the driving power of the first power unit is reduced by not using the second power unit and putting the connecting means in the non-transmitting state. Transmitting to the first driving force applying means, not transmitting the driving force to the second driving force applying means,
When the rotational torque required for the rotating means is larger than the first threshold value, the driving power of the first power unit is reduced by using the second power unit and setting the connecting means to the non-transmitting state. Transmitting to the first driving force applying means and transmitting the driving force of the second power unit to the second driving force applying means;
The pile press-in method according to claim 9.

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