JP4313509B2 - Hollow pile rotary press-fitting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow pile rotary press-fitting construction device used for a so-called digging method in which a hollow pile is rotationally pressed and buried in the ground while excavating the inside of the hollow pile with an auger screw.
[0002]
[Prior art]
In the middle digging method, a hollow pile rotary press-fitting construction device that has an auger rotation drive device that moves up and down along the leader and a hollow pile rotation drive device is used to construct the hollow pile while excavating it with an auger screw. The hollow pile can be dug with a low-load excavation rotational torque at a predetermined depth in the case of, but at the final stage of so-called piercing, the auger screw is pulled up by a predetermined amount and only the hollow pile is rotationally press-fitted into the solid support layer of the ground. The pile is buried to a certain length, and the tip of the hollow pile is closed with the earth and sand of the support layer to secure the support force, so a large rotational torque is required.
[0003]
For this reason, there is a method of rotationally press-fitting a hollow pile to the support layer with another high-torque type hollow pile rotary drive device at the time of rooting, or a method using a pile driving machine equipped with a high-torque type hollow pile rotary drive device. Was taken [0004]
[Problems to be solved by the invention]
However, when using another high-torque type hollow pile rotary drive device, the pile piler is buried in front of the support layer with the auger screw of the pile driver, and then the pile driver is retracted and another high torque type is driven. Since the hollow pile rotation drive device is suspended and set by equipment such as a crane, reassembly time and a large number of equipment are required. Moreover, since the pile driving machine equipped with the high-torque hollow pile rotary drive device is a large device commensurate with this, the efficiency is low and the cost is high.
[0005]
Therefore, the present invention provides a hollow pile rotary press-fitting construction device which is an efficient device and reduces cost by adding the rotational torque of the auger rotary drive device to the hollow pile rotary drive device only at the time of rooting. It is aimed.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a hollow pile rotary press-fitting construction apparatus including an auger rotation drive device that moves up and down along a leader and a hollow pile rotation drive device. A cylinder is connected to the auger drive shaft of the drive device, an engagement projection is provided on the outer periphery of the cylinder, and the cylinder is raised to the inner periphery of the hollow pile connected to the hollow pile drive shaft of the hollow pile rotation drive device An engagement protrusion that engages with the engagement protrusion of the cylindrical body when the engagement protrusion of the hollow pile and the engagement protrusion of the cylindrical body engage with each other. The means of claim 2 is characterized in that the rotation torque of the auger rotation drive device is added to the rotation torque of the hollow pile rotation drive device by rotating the hollow pile rotation drive device together. Connect the cylinder to the auger drive shaft and An engaging protrusion that is provided with a mating protrusion and engages with the engaging protrusion of the cylindrical body when the cylindrical body is raised on the inner periphery of the connecting member between the hollow pile driving shaft and the hollow pile of the hollow pile rotation driving device When the engagement protrusion of the hollow pile and the engagement protrusion of the cylindrical body are engaged, the auger rotation drive device and the hollow pile rotation drive device are rotated together to The rotational torque is added to the rotational torque of the hollow pile rotary drive device .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings. 1 to 4 show a first embodiment of the present invention. The pile driving machine 1 is hollow with an auger rotation driving device 4 so as to be movable up and down along a leader 3 erected on the front part of a base machine 2. The pile rotation drive device 5 is provided, the auger rotation drive device 4 and the hollow pile rotation drive device 5 are connected by a cylinder 6, and a pushing force is applied to the hollow pile rotation drive device 5 by the cylinder 6. Has been.
[0008]
The auger rotation drive device 4 is connected to an auger drive shaft 4 a with an auger screw 7 and a cylinder 8 provided on the outer periphery of the shaft portion of the auger screw 7. The cylindrical body 8 is provided with a plurality of engaging projections 8a on the outer periphery of the lower end thereof. The hollow pile rotation drive device 5 is connected to a hollow pile drive shaft 5a via a pile cap 9 that is a connecting member. The hollow pile 10 is provided with a plurality of engaging protrusions 10a on the inner periphery of the upper end. The cylindrical body 8 is formed in such a length that the engaging protrusion 8a engages with the engaging protrusion 10a of the hollow pile 10 when the cylinder 6 is extended to the maximum.
[0009]
By this construction, the hollow pile 10 can be excavated with the excavation rotational torque of the hollow pile rotation drive device 5 at a predetermined depth during construction by excavating the inside of the hollow pile 10 with the auger screw 7, and the support layer When the cylinder 6 is extended to the maximum and the auger screw 7 is pulled up, the engagement protrusion 8a of the cylindrical body 8 engages with the engagement protrusion 10a of the hollow pile 10, so that the auger rotation drive device 4 and the hollow pile By rotating together with the rotational drive device 5, the rotational torque of the auger rotational drive device 4 can be added to the rotational torque of the hollow pile rotational drive device 5, and the hollow pile 10 can be embedded in the support layer with a large rotational torque. . Further, by pulling up the auger screw 7, the tip of the hollow pile 10 is closed by the earth and sand of the support layer, and a predetermined support force can be easily obtained. Therefore, it is not necessary to make the hollow pile rotation drive device 5 a high torque type, and it is sufficient that the combined rotation torque of the auger rotation drive device 4 and the hollow pile rotation drive device 5 is larger than the maximum load. Thus, weight reduction and cost reduction can be achieved.
[0010]
FIG. 5 shows a second embodiment in which an engagement protrusion 9a that engages with the engagement protrusion 8a of the cylindrical body 8 is provided on the inner periphery of the pile cap 9, and the same effect as that of the first embodiment is shown. There is an effect. Moreover, as shown in FIG. 6, the present invention can be applied to a pile driving machine configured such that the auger rotation driving device 4 and the hollow pile rotation driving device 5 are moved up and down independently.
[0011]
【The invention's effect】
As described above, the hollow pile rotary press-fitting construction device according to the present invention connects the cylinder to the auger drive shaft of the auger rotation drive device, and engages with the engagement protrusion of the cylinder when the auger screw is pulled up. Since the joint protrusion is provided on the inner periphery of the hollow pile connected to the hollow pile drive shaft of the hollow pile rotation driving device or the connecting member inner periphery with the hollow pile, the auger screw is pulled up when the hollow pile is installed, By engaging the engagement protrusions of the hollow pile or the engagement protrusions of the connecting member, the rotational torque of the auger rotation drive device can be added to the rotation torque of the hollow pile rotation drive device, and the hollow pile has a large rotation torque. Since it can be embedded in the support layer, it is not necessary to replace the device or to make the hollow pile rotary drive device a high torque type, so that the device becomes an efficient device, and the weight can be reduced and the cost can be reduced. Further, by pulling up the auger screw, the end of the hollow pile is closed by the earth and sand of the support layer, and a predetermined support force can be easily obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a state in which an engagement protrusion of a cylindrical body and an engagement protrusion of a hollow pile are engaged. -III cross-sectional view [Fig. 4] Side view of the pile driver [Fig. 5] Cross-sectional view showing the second embodiment of the present invention [Fig. 6] Pile having a different configuration from the pile driver of the first embodiment Side view of the hammer [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pile driver, 2 ... Base machine, 3 ... Leader, 4 ... Auger rotation drive device, 4a ... Auger drive shaft, 5 ... Hollow pile rotation drive device, 5a ... Hollow pile drive shaft, 7 ... Auger screw, 8 ... Cylinder, 8a ... engagement projection of cylinder, 9 ... pile cap, 9a ... engagement projection of pile cap, 10 ... hollow pile, 10a ... engagement projection of hollow pile

Claims (2)

In a hollow pile rotary press-fitting construction device comprising an auger rotation drive device that moves up and down along a leader and a hollow pile rotation drive device, a cylinder is connected to the auger drive shaft of the auger rotation drive device, An engagement protrusion is provided on the inner periphery of the hollow pile connected to the hollow pile drive shaft of the hollow pile rotation drive device and engages with the engagement protrusion of the cylinder when the cylinder is raised. When the engagement protrusion of the hollow pile and the engagement protrusion of the cylindrical body are engaged, the auger rotation drive device and the hollow pile rotation drive device are rotated together to rotate the auger rotation drive device. A hollow pile rotary press-fitting construction device that adds torque to the rotational torque of a hollow pile rotary drive device. In a hollow pile rotary press-fitting apparatus having an auger rotation drive device that moves up and down along a leader and a hollow pile rotation drive device, a cylinder is connected to an auger drive shaft of the auger rotation drive device and engaged with the outer periphery of the cylinder An engagement protrusion that engages with the engagement protrusion of the cylinder when the cylinder is raised is provided on the inner periphery of the connecting member between the hollow pile drive shaft and the hollow pile of the hollow pile rotation drive device. When the engagement protrusion of the hollow pile and the engagement protrusion of the cylindrical body are engaged, the auger rotation drive device and the hollow pile rotation drive device are rotated together to rotate the auger rotation drive device. A hollow pile rotary press-fitting construction device that adds torque to the rotational torque of a hollow pile rotary drive device.

Images