JPH11209977A - Rotary pile driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform pile driving work with simple constitution by transmitting rotation of a pile driving jig fitted to a spline output shaft of a hydraulic motor to a projection arranged in a cylindrical pile to engage with a cutout of a pile inserting cylinder. SOLUTION: This rotary pile driver is composed of a hydraulic motor 3 and a pile driving jig 9 arranged on the tip of a crane 2. The driving jig 9 has a fitting cylinder and a pile inserting cylinder. A cylindrical pile 10 used as the pile driving jig 9 has a projection joined to a cutout of the pile inserting cylinder and a spiral blade arranged on the tip outer periphery. The pile inserting cylinder of the driving jig 9 is inserted into the base end of the cylindrical pile 10 by the crane 2 by standing up the cylindrical pile 10 on the weak ground. Next, the cutout of the pile inserting cylinder and the projection of the cylindrical pile 10 are fitted together by rotating the fitting cylinder and the pile inserting cylinder by the hydraulic motor 3. Then, the cylindrical pile 10 rotates together with the driving jig 9, so that the cylindrical pile 10 is buried underground while rotating the action of the spiral blade. Therefore, pile driving work of the soft ground can be performed with simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pile driver for driving a reinforcing pile buried in the ground in order to improve soft ground when building a wooden building.

[0002]

2. Description of the Related Art In general, if land is buried in a paddy field and land is built, if a house is built immediately because it was originally a paddy field, land subsidence will occur. I had to wait for a while. Even if it is not a landfill site, there is already soft ground, and striking them with reinforcing piles has been used to strengthen the ground.

[0003]

However, since a large number of piles must be driven in to reinforce the ground, the operation of driving the reinforcing pile takes time, and the concrete foundation foundation is placed on the driven reinforcing pile. Therefore, it was necessary to evenly align the upper ends of the reinforcing piles, and these operations could not be completed in a short time. for that reason,
There has been a demand for a rotary pile driver that has no noise, is easy to operate, and can uniformly align the upper ends of the reinforcing piles in a short time.

[0004]

In order to solve the above problems, a rotary pile driver according to the present invention comprises a hydraulic motor provided at the tip of a crane of a truck crane and a spline output shaft of the hydraulic motor. A pile driving jig having a fitting cylinder provided with a fitting groove, a base integrally connected to the fitting cylinder, and a pile insertion cylinder having a notch integrally connected to the base,
It comprises a projection on the base outer periphery that engages with the notch of the pile insertion tube, and a cylindrical pile provided with a spiral blade on the outer periphery of the tip. Further, the pile driving jig used for the rotary pile driver has a fitting cylinder in which an uneven groove is formed on a cylindrical inner wall so as to be fitted in an uneven groove of a spline output shaft of a hydraulic motor at an upper portion. A central portion having a base portion larger than the outer diameter of the fitting tube, the upper end of the base portion being integrally connected to the fitting tube by welding, and a lower portion of the pile insertion tube being larger than the outer diameter of the base portion. And a notch for fitting a projection provided at a base end of the cylindrical pile is formed at two positions in a diameter direction of a lower end of the pile insertion cylinder. Further, the pile driving jig has a reference line for determining a burial depth.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A ground pile to be reinforced, for example, a cylindrical pile is erected at a position where a through pillar stands, with a spiral wing on a lower side and a projection on a higher side. When the pile insertion tube of the jig is inserted from above into the base end of the cylindrical pile erected on the ground surface and the hydraulic motor is slowly rotated, it is transmitted to the fitting tube via the spline output shaft and is transmitted through the base. The pile insertion tube, which is integrally connected, rotates, so that the notch of the pile insertion tube is located at the protrusion of the cylindrical pile, the notch and the protrusion are fitted, and the cylindrical pile is Since the cylindrical pile is rotated together with the jig, the cylindrical pile is buried in the ground while rotating by the action of the spiral wing, and the operator watches the hydraulic motor while carefully watching the fitting between the notch and the projection so as not to come off. Are sequentially lowered according to the progress of the cylindrical pile. While repeating this process, a large number of cylindrical piles can be buried in necessary places.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, a rotary pile driver has a fitting cylinder provided with a groove for fitting to a hydraulic motor 3 provided at a tip of a crane 2 of a truck crane 1 and a spline output shaft 4 of the hydraulic motor 3. 5, a pile driving jig 9 having a base 6 integrally connected to the fitting tube 5 and a notched pile insertion tube 7 integrally connected to the base 6; The cylindrical pile 10 is provided with a projection 12 on the outer periphery of the base end for engaging with the notch 11 of the pile insertion tube 7 and a spiral blade 13 on the outer periphery of the tip. Hereinafter, the pile driving jig 9 will be described in detail.

As shown in FIG. 3, a fitting cylinder 5 having an uneven groove formed on the inner wall of the cylinder so as to be fitted into the uneven groove of the spline output shaft 4 of the hydraulic motor 3 is provided on the upper part of the pile driving jig 9.
The fitting cylinder 5 has two sets of upper and lower bolts 15 in the diameter direction.
On the other hand, a hole (not shown) having the same diameter as the bolt hole 15 is formed in the spline output shaft 4, and the vertical movement is suppressed by inserting a bolt and fixing it with a nut. At the same time, one of the upper and lower sets is selected and the bolt is inserted into the bolt hole 15 so that the position of a reference line (not shown) provided on the outer periphery of the base 6 for setting the burial depth of the cylindrical pile 10 can be adjusted. The spline output shaft 4 and the fitting tube 5 can be fixed by tightening the opposite side with a nut.

In the center of the pile driving jig 9, there is provided a base 6 larger than the outer diameter of the fitting tube 5, and the upper end of the base 6 is integrally connected to the fitting tube 5 by welding. The lower end is integrally connected to the pile insertion tube 7 by welding, and the base portion 6 is made of a round steel bar having the same diameter. Also, on the outer periphery of the base 6,
A reference line (not shown) for certifying the burying depth of the cylindrical pile 10 is provided. As shown in FIG. Buried depth from the ground surface GL can be recognized.

Further, a lower portion of the pile driving jig 9 has a pile insertion tube 7 larger than the outer diameter of the base 6, and the pile insertion tube 7 has a depth into which the base end of the cylindrical pile 10 can be inserted. Notches 11 are formed at two positions in the diameter direction at the lower end of the pile insertion tube 7 with a length and a width to fit the protrusions 12 provided at the base end of the cylindrical pile 10. Have been.

A pile driving method using a rotary driving machine using the pile driving jig 9 will be described. A cylindrical pile 10 buried in soft ground has a diameter of 10 cm, a length of 3 to 5 m, and a thickness of 5 mm. Dimensions, the ground to be reinforced, e.g., the cylindrical pile 10 is erected at the position where the through column stands, with the spiral wing 13 on the lower side, and with the projection 12 on the upper side, and the operator operates the crane 2; When the pile insertion cylinder 7 of the pile driving jig 9 is inserted from above into the base end of the cylindrical pile 10 erected on the ground surface GL, and the hydraulic motor 3 is slowly rotated, it is fitted via the spline output shaft 4. The pile insertion tube 7 transmitted to the joint tube 5 and integrally connected via the base 6 rotates, so that the notch 11 of the pile insertion tube 7 is located at the protrusion 12 of the cylindrical pile 10, and the notch 11 The protrusion 12 is fitted. Then, since the cylindrical pile 10 rotates together with the pile driving jig 9, the cylindrical pile 10 is buried in the ground while rotating by the action of the spiral wing 13, and the operator operates the cutout 11 and the protrusion 12 The hydraulic motor 3 is successively lowered in accordance with the progress of the cylindrical pile 10 while watching the fitting so as not to come off. By repeating this process, a large number of cylindrical piles 10 can be buried in necessary places.

The completion of the embedding of each cylindrical pile 10 is as follows.
As shown in FIG. 1, the base end of a buried cylindrical pile 10 by visually recognizing a reference line (not shown) provided on the pile driving jig 9 by a level 14 installed near a work site. Can be adjusted, or the level can be adjusted by irradiating the reference line with a visible laser beam and visually confirming it. This will be described with reference to FIG. 2. As the burial of the cylindrical pile 10 proceeds, the entire cylindrical stake 10 enters below the ground surface GL, and is buried at a position below the ground surface GL as shown in FIG. 2. Is completed, the base end of the cylindrical pile 10 cannot be seen from the ground surface GL. Therefore, in order to align this position at the base end of all the cylindrical piles 10, a reference level is required. However, since a reference line having this level is provided at an appropriate position of the pile driving jig 9, By aligning the reference line with the level 14 shown in FIG. 1, the base ends of all the embedded cylindrical piles 10 can be made constant.

[0012]

As described above, the rotary pile driver according to the present invention has the following features.
The rotation of the pile driving jig fitted to the spline output shaft of the hydraulic motor is transmitted to the projection provided on the cylindrical pile that engages with the cutout of the pile insertion cylinder. You can perform a beating operation. Furthermore, the position of the base end of the cylindrical pile to be buried is set by the reference line provided on the pile driving jig, so that a large number of cylindrical piles can be buried by a simple operation. In addition, the spiral wing of the buried cylindrical pile serves as a settlement prevention wing that prevents settlement of the pile, so that it becomes a stable reinforcing pile.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a working state of a rotary pile driver according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the rotary pile driver of the present invention in a state where a cylindrical pile is buried underground.

FIG. 3 is a perspective view of a pile driving jig of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Truck crane 2 Crane 3 Hydraulic motor 4 Spline output shaft 5 Fitting cylinder 6 Base 7 Pile insertion cylinder 9 Pile driving jig 10 Cylindrical pile 11 Notch 12 Projection 13 Spiral wing 14 Level 15 Bolt hole

Claims (3)

[Claims] 1. A hydraulic motor provided at the tip of a crane of a truck crane, a fitting cylinder provided with a groove for fitting to a spline output shaft of the hydraulic motor, a base part integrally connected to the fitting cylinder, and A pile driving jig having a pile insertion cylinder having a cutout integrally connected thereto, a cylindrical pile having a projection on the base outer periphery engaged with the cutout of the pile insertion cylinder and a spiral blade on the distal end periphery. , A rotary pile driver. The pile driving jig used in the rotary pile driver has a fitting cylinder having an uneven groove formed on an inner wall of a cylindrical portion so as to be fitted into an uneven groove of a spline output shaft of a hydraulic motor at an upper portion. A central portion having a base portion larger than the outer diameter of the fitting tube, the upper end of the base portion is integrally connected to the fitting tube by welding, and the lower portion is larger than the outer diameter of the base portion. It has a pile insertion cylinder, and a cutout for fitting a projection provided at the base end of the cylindrical pile is formed at two diametrical positions at the lower end of the pile insertion cylinder. Piling jig. 3. The pile driving jig according to claim 2, wherein a reference line for determining a burial depth is written on the pile driving jig.