JP2017020253A - Pile press-in/pull-out machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile press-in/pull-out machine for improving working efficiency, by distributing hydraulic pressure output to pile press-in/pull-out means and auger excavation means in response to a work form and a work load in the pile press-in/pull-out machine for pressing in/pulling out a pile to the ground, by combinedly using the pile press-in/pull-out means and the auger excavation means driven by hydraulic pressure.SOLUTION: A pile press-in/pull-out machine is equipped with a first hydraulic pump 20 driven by an engine 10 for supplying hydraulic pressure as a power source of pile press-in/pull-out means 40 and a second hydraulic pump 30 driven by the engine 10 for supplying the hydraulic pressure as a power source of auger excavation means 50, and in independent operation time of the pile press-in/pull-out means 40, the total output of the hydraulic pressure outputted from the first hydraulic pump 20 and the second hydraulic pump 30 can be used as the power source of the pile press-in/pull-out means 40, and in simultaneous operation time, the hydraulic pressure outputted from the first hydraulic pump 20 is used as the power source of the pile press-in/pull-out means 40, and the hydraulic pressure outputted from the second hydraulic pump 30 is used as the power source of the auger excavation means 50.SELECTED DRAWING: Figure 1

Description

  The present invention is a pile press-fitting and drawing machine that is placed on an existing pile and presses and pulls the pile into and out of the ground using a pile press-fitting and pulling means that is driven by hydraulic pressure and an auger excavating means. The present invention relates to a pile press-in / pull-out machine that maximizes its performance by distributing hydraulic output to the pile press-in / pull-out means and auger excavating means to improve work efficiency.

  In recent years, in the press-fitting and drawing work of steel sheet piles in various civil engineering foundation works, static load type pile press-fitting machines with less vibration and noise have been adopted. As shown in Patent Document 1, this pile press-fitting and pulling machine is provided with a clamp device composed of a plurality of clamp members below a pedestal placed on an existing U-shaped steel sheet pile, and the existing steel is provided by this clamp device. A reaction force is obtained by clamping the sheet pile, and the steel sheet pile chucked by the chuck device is press-fitted and drawn into the ground by a pile press-fitting pull-out cylinder.

  Therefore, in hard ground, etc., when the pressure input by the pile press-in / out means required to press-fit the steel sheet pile exceeds the reaction force obtained from the existing pile (pressure input> reaction force from the existing pile), steel The sheet pile cannot be press-fitted. In such a case, simultaneously with the press-fitting of the steel sheet pile by the pile press-in / out means, the reaction force obtained from the existing pile can be reduced by reducing the press-in resistance due to earth pressure by using the press-in ground excavation by the auger excavation means. The steel sheet pile can be press-fitted with the following pressure inputs. The simultaneous excavation by the auger excavation means at the time of steel sheet pile press-fitting is performed by chucking the steel sheet pile and the auger casing with the chuck device while holding the hollow cylindrical auger casing in the recess of the U-shaped steel sheet pile. The tip and the tip of the steel sheet pile are engaged, and the press-fitted ground is excavated by an auger (auger head) attached to the tip of a screw rod inserted into the auger casing.

Japanese Patent No. 5460443

  In a pile press-in / pull-out machine combined with conventional auger excavation, the pile press-in / pull-out means and the auger excavation means are respectively supplied with hydraulic pressure supplied from a plurality of independent hydraulic pumps driven by one engine equipped in the hydraulic unit. Power source. That is, as shown in FIG. 6, the first hydraulic pump 84 and the second hydraulic pump 85 are driven by the output of the engine 81 equipped in the hydraulic unit 80, and the hydraulic pressure from the first hydraulic pump 84 is supplied to the pile press-fitting and extracting machine 90. The hydraulic pressure from the second hydraulic pump 85 is supplied to the auger excavating means 92, respectively. The output of the engine 81 is divided into a first hydraulic pump output area 82 dedicated to the first hydraulic pump 84 and a second hydraulic pump output area 83 dedicated to the second hydraulic pump 85 at a predetermined ratio. The sum of both is the range of the maximum output of the engine 81.

  That is, in the prior art, it is assumed that a dedicated engine output area called a first hydraulic pump output area 82 and a second hydraulic pump output area 83 is always secured in the pile press-in / out means 91 and the auger excavating means 92, respectively. It was. Therefore, even when the engine output of one of the pile press-fitting / extracting means 91 or the auger excavating means 92 is unnecessary or has a margin, the engine output cannot be used as the other engine output. In addition, since the first hydraulic pump 84 of the pile press-in / pull-out means 91 and the second hydraulic pump 85 of the auger excavating means 92 are also dedicated independent hydraulic pumps, one of the first hydraulic pump 84 or the second hydraulic pump 85 is used. Even when the hydraulic output is unnecessary or has a margin, the hydraulic output cannot be diverted and used for the other.

  Conventionally, depending on the ground condition and work purpose, without using the auger excavating means 92, when using the pile press-fitting / extracting means 91 alone, or when performing a prior excavation using only the auger excavating means 92, etc. Even when the working mode and the pile press-in / out means 91 and the auger excavating means 92 are used in combination, the engine output and hydraulic output of the means with less load can be reduced when the work load of the two is different. It could not be diverted for engine output or hydraulic output.

  Therefore, in order to improve work efficiency, the present invention sets a new problem of effectively using the output of the engine and the hydraulic pump according to the work mode and work load, and is placed on the existing pile and driven by hydraulic pressure. This is a pile press-fitting / pulling machine that presses and pulls a pile into the ground using both a pile press-fitting and pulling means and an auger excavating means. An object of the present invention is to provide a pile press-fitting / pulling machine that combines excavation with an auger that improves work efficiency by distributing.

  In order to solve the above-mentioned problems, the present invention provides a pile press-fitting and drawing machine having a pile press-fitting and drawing means and an auger excavating means that are driven by hydraulic pressure, and is driven by an engine that supplies hydraulic pressure as a power source of the pile press-fitting and drawing means. 1 hydraulic pump and a second hydraulic pump that is driven by an engine that supplies hydraulic pressure as a power source for the auger excavating means are provided, and outputs from the first hydraulic pump and the second hydraulic pump when the pile press-fitting / extracting means is operated independently. The total output of the hydraulic pressure can be used as a power source for the pile press-in / pull-out means, and the hydraulic pressure output from the first hydraulic pump can be used as a power source for the pile press-in / pull-out means when the pile press-in / pull-out means and the auger excavating means are operated simultaneously. A pile press-fitting and drawing machine that uses the hydraulic pressure output from the second hydraulic pump as a power source for the auger excavation means is provided as a basis.

  And the structure which changes and controls the output ratio of the engine to a 1st hydraulic pump and a 2nd hydraulic pump within the maximum output range of an engine, and the variable displacement hydraulic pump was used as a 1st hydraulic pump and a 2nd hydraulic pump Provided is a configuration and a configuration in which the hydraulic pressure between the first hydraulic pump and the second hydraulic pump can be merged or cut off.

  According to the pile press-fitting and drawing machine combined with excavation by the auger according to the present invention, the output of the engine as the power source of the first hydraulic pump and the second hydraulic pump consisting of a variable capacity hydraulic pump according to the work form and work load. The ratio can be changed and controlled within the range of the maximum output. That is, it is possible to freely change and control the output ratio of the engine to the pile press-in / out means and the auger excavation means within the maximum output range of the engine. Therefore, the engine output can be used efficiently and maximally in both the pile press-in / out means and the auger excavation means. Furthermore, the hydraulic pressure output from the second hydraulic pump as the power source of the auger excavation means is used by being merged with the hydraulic pressure output from the first hydraulic pump as the power source of the pile press-in / withdrawing means as required. Therefore, it is possible to maximize the ability of the pile press-fitting and drawing means and improve the working efficiency of the pile press-fitting and drawing machine.

The chart figure which shows the hydraulic pressure supply in the pile press-fit drawing machine concerning this invention. The side view of the pile press-fit drawing machine concerning this invention. The hydraulic circuit diagram of the pile press-fit drawing machine concerning the present invention. The characteristic view which shows an example of the control means of a hydraulic pump. The characteristic view which shows the other example of the control means of a hydraulic pump. The chart which shows the hydraulic pressure supply in the conventional pile press-fit drawing machine.

  Hereinafter, an embodiment of a pile press-fitting and drawing machine that uses excavation by an auger according to the present invention will be described with reference to the drawings. The pile press-fitting and drawing machine according to the present invention has a pile press-fitting and drawing means and an auger excavating means that are driven by hydraulic pressure, as long as it can be used together with excavation by an auger or press-fit a steel sheet pile into the ground. There is no limitation, and a publicly known static load type pile press-drawing machine can be used. An example of the basic configuration will be described with reference to FIG.

  FIG. 2 is a side view of the pile press-fitting / pulling machine 60 showing the mounted state of the auger casing 51 and the steel sheet pile 69. In the figure, 60 is a pile press-fitting and drawing machine, 61 is a pedestal, and 62 is a clamping device, which is arranged at the lower part of the pedestal 61 and clamps an existing steel sheet pile 68 to place the pile press-fitting and drawing machine 60. In addition, the reaction force is obtained from the existing steel sheet pile 68. In the illustrated example, three clamping devices 62 are slidable in the width direction along the clamp guide formed on the lower surface of the base 61.

  F indicates the traveling direction of the pile press-fitting and drawing machine 60. A slide base 63 is provided on the pedestal 61 so as to be slidable at a distance equal to or greater than the joint pitch of the steel sheet pile 69 to be press-fitted along the straight forward direction F of the pile press-fitting and drawing machine 60. A turntable 64 is provided on the slide base 63 so as to be rotatable about a vertical axis (not shown), and a support arm 66 pivotally supported by a bearing portion 65 provided at the tip of the turntable 64. A guide frame 67 is erected through the. The guide frame 67 can be tilted about the horizontal axis of the bearing portion 65 by expansion and contraction of a tilt cylinder (not shown) whose one end is pivotally supported by the support arm 66.

  An elevating body 41 is mounted on the guide frame 67 so as to be movable up and down. A pair of left and right pile press-in / draw-out cylinders 42 are attached to both sides of the lift body 41, and one end of the pile press-in / draw-out cylinder 42 is pivotally supported by the bearing portion 65 to drive the lift body 41 up and down. It is configured as follows. A chuck frame 43 is formed below the elevating body 41, and a steel sheet pile 69 and an auger casing 51 are inserted into the insertion holes (not shown) in the chuck frame 43 and chucked together. The device 44 is detachably equipped. The above-described lifting body 41, pile press-in / pull-out cylinder 42, chuck frame 43, chuck device 44, and the like constitute a pile press-in / pull-out means 40 (see FIG. 1). Press 69 into the ground.

  An auger excavator 52 is attached to the upper end of the auger casing 51, and a screw rod 53 connected to the auger excavator 52 is inserted into the auger casing 51, and an auger 54 is rotatable and rotated at the tip. It is mounted so that the direction can be switched. The auger 54 is rotationally driven by an auger drive hydraulic motor 55 built in the auger excavator 52. The auger casing 51 is lifted and lowered by a vertical movement of a cylinder built in the auger excavator 52 or a vertical movement of the lifting body 41 of the pile press-fitting and pulling machine 60 holding the auger casing 51. The auger excavator 50 (see FIG. 1) is constituted by the auger excavator 52, the auger casing 51, the screw rod 53, the auger 54, the auger driving hydraulic motor 55, and the like, and the auger excavator 52 is driven by hydraulic pressure. Reference numeral 56 denotes a hydraulic hose winder for supplying hydraulic pressure as a power source to the auger excavator 52.

  The present invention is characterized in that a hydraulic pressure is supplied as a power source for the above-described pile press-in / out means 40 and auger excavation means 50. The configuration will be described with reference to a chart showing the hydraulic pressure supply of the present invention shown in FIG. Also in the present invention, the first hydraulic pump 20 and the second hydraulic pump 30 are driven by the output of the engine 10 provided in the hydraulic unit 1, and the hydraulic pressure from the first hydraulic pump 20 is supplied to the pile press-in / out means 40. Supplying the hydraulic pressure from 30 to the auger excavator 50 is the same as in the prior art.

  The first characteristic configuration of the present invention is that each of the first hydraulic pump 20 and the second hydraulic pump 30 employs a variable displacement hydraulic pump, and the first hydraulic pump output region 11 and the second hydraulic pump in the engine 10. Without distinguishing the output area 12 for exclusive use as a dedicated area, if the total output to both is within the range of the maximum output of the engine 10, the maximum output to the first hydraulic pump 20 or the second hydraulic pump 30 is set. It is to be able to change freely within the range of the maximum output of the engine 10. Therefore, when the first hydraulic pump 20 or the second hydraulic pump 30 is not used or when the amount of hydraulic pressure to be used is small, the output of the unused portion of the engine 10 is output to the second hydraulic pump 30 or the first hydraulic pump 30 respectively. It can be output as the driving force of the hydraulic pump 20. That is, the output ratio of the engine 10 to the pile press-fitting / extracting means 40 and the auger excavating means 50 can be freely changed and controlled within the range of the maximum output of the engine 10.

  The second characteristic configuration of the present invention is that the hydraulic pressure between the first hydraulic pump 20 and the second hydraulic pump 30 can be merged or cut off. Therefore, when the pile press-in / pull-out means 40 or the auger excavating means 50 is operated alone, the hydraulic pressures output from the first hydraulic pump 20 and the second hydraulic pump 30 which are a plurality of variable capacity hydraulic pumps are merged, and the total output is obtained. It can be used as a power source for the pile press-fitting / extracting means 40 or the auger excavating means 50. Further, when the pile press-in / pull-out means 40 and the auger excavating means 50 are simultaneously operated, the hydraulic pressure output between the first hydraulic pump 20 and the second hydraulic pump 30 which are a plurality of variable capacity hydraulic pumps is cut off, and the pile press-in / pull-out means is respectively provided. 40 and auger drilling means 50 can be used as a power source.

  Next, an example of a hydraulic circuit for realizing the above configuration will be described with reference to FIG. In the figure, reference numeral 42 denotes a pile press-in / pull-out cylinder, which constitutes a pile press-in / pull-out means 40. An auger drive hydraulic motor 55 constitutes an auger excavating means 50. The hydraulic pressure driven by the engine 10 and supplied from the first hydraulic pump 20 constituted by the variable displacement hydraulic pump is P1, and similarly, from the second hydraulic pump 30 driven by the engine 10 and constituted by the variable displacement hydraulic pump. Let the supplied hydraulic pressure be P2.

  A check valve 21 joins the hydraulic pressure P2 from the second hydraulic pump 30 to the hydraulic pressure P1 from the first hydraulic pump 20. A direction switching valve 22 joins the hydraulic pressure P2 to the hydraulic pressure P1 when energized. A shuttle block 23 prevents backflow from the hydraulic pressure P1 to the hydraulic pressure P2 when the hydraulic pressure P1 and the hydraulic pressure P2 are used separately. Reference numeral 57 denotes a rotation direction switching valve, which sets the rotation direction by switching forward rotation or reverse rotation of the auger drive hydraulic motor 55. Reference numeral 45 denotes a vertical movement switching valve, which sets the moving direction by switching the lifting or lowering of the pile press-in / out cylinder 42. An electromagnetic solenoid 24 is attached to the first hydraulic pump 20 and the second hydraulic pump 30 and adjusts its output. Reference numeral 25 denotes a controller which performs various settings for controlling the hydraulic circuit. 26 is an oil tank.

[When the pile press-in / out means 40 and the auger excavator 50 are driven simultaneously]
By simultaneously driving the pile press-in / pull-out cylinder 42 constituting the pile press-in / pull-out means 40 and the auger driving hydraulic motor 55 constituting the auger excavating means 50, the steel sheet pile 69 is pile-push-in / pull out together with excavation by the auger 54. In the simultaneous operation of press-fitting into the ground by the cylinder 42, the direction switching valve 22 is closed by energization from the controller 25, and the switching from the hydraulic pressure P2 to the hydraulic pressure P1 is switched to be set. In this state, the controller 25 energizes the rotation direction switching valve 57 to select the rotation direction of the auger drive hydraulic motor 55 and, similarly, the controller 25 energizes the vertical movement switching valve 45 to apply the pile press-in / out cylinder 42. Select ascending or descending.

  With the above setting, the pile press-in / pull-out cylinder 42 is driven by the hydraulic pressure P1 from the first hydraulic pump 20, the auger drive hydraulic motor 55 is rotated by the hydraulic pressure P2 from the second hydraulic pump 30, and the auger 54 is rotated. Thus, the steel sheet pile 69 can be press-fitted into the ground by the pile press-fitting pull-out cylinder 42 together with simultaneous excavation by the auger 54. At this time, the output of the engine 10 can be freely changed and controlled to the output to the first hydraulic pump 20 and the second hydraulic pump 30 within the range of the maximum output.

[When driving the pile press-in / out means 40 alone]
When the pile press-in / pull-out cylinder 42 as the pile press-in / pull-out means 40 is driven independently without using the auger excavating means 50, the rotation direction switching valve 57 of the auger drive hydraulic motor 55 is energized by the controller 25. Is closed, and the direction switching valve 22 is opened to switch to a state in which merging from the hydraulic pressure P2 to the hydraulic pressure P1 is possible. In this state, the controller 25 energizes the vertical movement switching valve 45 to select ascent or descent of the pile press-in / out cylinder 42.

  With the above setting, the hydraulic pressure P2 from the second hydraulic pump 30 passes through the check valve 21 and the hydraulic pressure P2 joins via the direction switching valve 22 to the hydraulic pressure P1 from the first hydraulic pump 20. Therefore, within the range of the maximum output of the engine 10, it is possible to operate the pile press-in / pull-out cylinder 42 by the combined hydraulic pressure of “hydraulic pressure P1 + hydraulic pressure P2”.

  FIG. 4 is a characteristic diagram illustrating an example of a control method for the first hydraulic pump 20 and the second hydraulic pump 30. In the figure, 13 is the maximum horsepower curve of the engine 10, and 14 is its minimum horsepower curve. The output control range 15 between the maximum horsepower curve 13 and the minimum horsepower curve 14 is the control current value of the electromagnetic solenoid 24. By performing the change control, the discharge pressures and discharge amounts of the hydraulic pressures P 1 and P 2 of the first hydraulic pump 20 and the second hydraulic pump 30 can be proportionally controlled within the output control range 15.

  FIG. 5 is a characteristic diagram showing another example of a method for controlling the first hydraulic pump 20 and the second hydraulic pump 30. Based on the constant horsepower line 27 of the engine 10, the first hydraulic pump 20 and the second hydraulic pressure are controlled by changing the control current value of the electromagnetic solenoid 24 to the setting position 28 for obtaining the target discharge pressure and discharge amount. The discharge pressures and discharge amounts of the hydraulic pressures P1 and P2 of the pump 30 can be increased or decreased.

  In the above-described hydraulic circuit, the example in which the hydraulic pressure P2 of the second hydraulic pump 30 is merged with the hydraulic pressure P1 of the first hydraulic pump 20 has been described. Similarly, the hydraulic pressure P1 of the first hydraulic pump 20 is changed to the second hydraulic pump. It is also possible to join 30 hydraulic pressures P2.

  According to the pile press-fitting and drawing machine combined with excavation by the auger according to the present invention, the output of the engine as the power source of the first hydraulic pump and the second hydraulic pump consisting of a variable capacity hydraulic pump according to the work form and work load. The ratio can be changed and controlled within the range of the maximum output. That is, it is possible to freely change and control the output ratio of the engine to the pile press-in / out means and the auger excavation means within the maximum output range of the engine. Therefore, the engine output can be used efficiently and maximally in both the pile press-in / out means and the auger excavation means. Furthermore, the hydraulic pressure output from the second hydraulic pump as the power source of the auger excavation means is used by being merged with the hydraulic pressure output from the first hydraulic pump as the power source of the pile press-in / withdrawing means as required. Therefore, it is possible to maximize the ability of the pile press-fitting and drawing means and improve the working efficiency of the pile press-fitting and drawing machine.

DESCRIPTION OF SYMBOLS 1,80 ... Hydraulic unit 10, 81 ... Engine 11, 82 ... Output area for 1st hydraulic pump 12, 83 ... Output area for 2nd hydraulic pump 13 ... Maximum horsepower curve 14 ... Minimum horsepower curve 15 ... Output control range 20, 84 ... First hydraulic pump 21 ... Check valve 22 ... Direction switching valve 23 ... Shuttle block 24 ... Electromagnetic solenoid 25 ... Controller 26 ... Oil tank 27 ... Constant horsepower line 28 ... Set position 30,85 ... Second hydraulic pump 40,91 ... Pile press-fitting and extracting means 41 ... Elevating body 42 ... Pile press-fitting and extracting cylinder 43 ... Chuck frame 44 ... Chuck device 45 ... Vertical movement switching valve 50, 92 ... Auger excavating means 51 ... Auger casing 52 ... Auger excavator 53 ... Screw rod 54 ... Auger 55 ... Auger drive hydraulic motor 56 ... Hydraulic hose winder 57 ... Rotation direction switching valve 6 0, 90 ... Pile press fitting and drawing machine 61 ... Pedestal 62 ... Clamping device 63 ... Slide base 64 ... Turntable 65 ... Bearing section 66 ... Support arm 67 ... Guide frame 68 ... Existing steel sheet pile 69 ... Steel sheet pile P1, P2 ... Hydraulic pressure

Claims (4)

In a pile press-in / pull-out machine having a pile press-in / pull-out means driven by hydraulic pressure and an auger excavation means,
A first hydraulic pump driven by an engine that supplies hydraulic pressure as a power source for the pile press-in / pull-out means and a second hydraulic pump driven by an engine that supplies hydraulic pressure as a power source for the auger excavating means are equipped, In the single operation of the means, the total output of the hydraulic pressure output from the first hydraulic pump and the second hydraulic pump can be used as the power source of the pile press-in / out means, and at the same time the pile press-in / out means and the auger excavating means are simultaneously operated, A pile press-fitting and drawing machine using the hydraulic pressure output from the first hydraulic pump as a power source for the pile press-in / pull-out means and the hydraulic pressure output from the second hydraulic pump as the power source for the auger excavating means.   The pile press-fit pulling machine according to claim 1, wherein the output ratio of the engine to the first hydraulic pump and the second hydraulic pump is changed and controlled within a maximum output range of the engine.   The pile press-fitting and extracting machine according to claim 1 or 2, wherein a variable displacement hydraulic pump is used as the first hydraulic pump and the second hydraulic pump.   The pile press-fitting and extracting machine according to claim 1, 2, or 3, wherein the hydraulic pressure between the first hydraulic pump and the second hydraulic pump can be merged or interrupted.

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