JP3582005B2 - Pile driver - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pile driver provided with a lower guide such as an auger screw, a steady rest of a casing, and a pile holder at a lower portion of a leader.
[0002]
[Prior art]
In a pile driving machine in which a working device such as a hammer or an auger driving device is provided to be able to move up and down on a leader erected on the front of a base machine so as to be able to move up and down, for example, as disclosed in Japanese Utility Model Publication No. 3-52260. In some cases, an auxiliary reader that protrudes from the lower end of the reader is supported by a cylinder provided inside the lower part of the reader, and the auxiliary reader is grounded and used as a front jack of the reader during work. When the auxiliary reader is housed in the reader, a pin is inserted into a pin hole formed in the auxiliary reader and the reader and held.
[0003]
Some pile driving machines are provided with a lower guide such as an auger screw, a steady rest of a casing, and a pile holder below the leader. This lower guide is fixed to the lower part of the leader, or the lower guide is hung by a winch rope provided in the pile driver body or the leader, and is guided along a guide pipe provided in the leader to guide the working device. Some raise and lower the lower guide.
[0004]
[Problems to be solved by the invention]
By the way, in a pile driver, it is necessary to lower the auger drive unit near the ground surface in order to deepen the excavation length with a short leader, but in the above-mentioned structure, the lower guide can move only to the lower end of the guide pipe, and There is a limit to the lowering of the auger drive because it cannot be approached to the top. For this reason, if a long leader and a long auger screw or casing are used, a large pile driver will be used to ensure stability.
[0005]
Therefore, an object of the present invention is to provide a pile driver in which the lower guide is brought closest to the ground surface to increase the lifting stroke of the auger drive device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention supports an auxiliary reader that protrudes and retracts from the lower end of the reader with a cylinder provided inside the lower part of the reader, and pierces the auxiliary reader housed in the reader in the auxiliary reader and the reader. In a pile driver that inserts and holds a pin in a pin hole, a lower guide is detachably provided in a pin hole of an auxiliary leader protruding from the lower end of the leader.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. The pile driver 1 is provided with a leader 3 at the front of a base machine 2 so as to be able to move up and down, and supports the standing leader 3 with a back stay 4 from behind. The reader 3 has an upper reader 3a and a lower reader 3b which is provided to be foldable on the upper reader 3a. A rack 6 for moving up and down the auger driving device 5 and a guide pipe 7 are fixed to the reader 3. The auger driving device 5 has the casing 8 mounted thereon, meshes the pinion 9 with the rack 6, engages the guide gib 10 with the guide pipe 7, and moves up and down along the leader 3.
[0008]
A hydraulic cylinder 11 that extends the rod 11a downward is provided inside the lower leader 3b. The hydraulic cylinder 11 has an upper end of a main body 11b connected to a bracket 3c fixed to a lower end of the upper leader 3a by a pin, and supports an auxiliary leader 12 which protrudes and retracts from a lower end of the lower leader 3a by a rod 8a. In the lower part of the auxiliary reader 12, pin holes 12a, 12a are formed. When the auxiliary reader 12 is pulled up and stored in the lower reader 3b, the pin holes 12a are aligned with the pin holes 3d formed in the lower reader 3b, and the pins 13, 13 are inserted. The auxiliary reader 12 is stored and held in the lower reader 3b. In addition, when the reader 3 is tilted horizontally above the base machine 2 during transportation, the pins 13, 13 are inserted into the pin holes 3d, 3d of the lower reader 3b and the pin holes 12a, 12a of the auxiliary reader 12. When the rod 11a of the hydraulic cylinder 11 is extended, the main body 11b of the hydraulic cylinder 11 rises to bend the upper leader 3a and the lower leader 3b, and the lower leader 3b is held vertically at the front of the base machine 2. You.
[0009]
A lower guide 14 is detachably provided in the pin holes 12 a of the auxiliary reader 12. The lower guide 14 has a guide portion 14a and a mounting portion 14b, and pin holes 14c, 14c are formed in the mounting portion 14b. The lower guide 14 is fitted to the lower portion of the auxiliary reader 12 projecting from the lower end of the lower reader 3b, and the pin holes 14c, 14c are aligned with the pin holes 12a, 12a of the auxiliary reader 12, so that the two pin holes 14c, Attachment is achieved by inserting pins 13, 13 into 14c, 12a, 12a.
[0010]
With this configuration, the rod 11a of the hydraulic cylinder 11 is extended and the lower guide 14 is attached as shown in FIG. 3 from the state where the lower guide 14 during normal excavation work shown in FIG. The auxiliary reader 12 is lowered and grounded, the auxiliary reader 12 is used as a front jack, the lower guide 14 can be brought closest to the ground surface, and the auger driving device 5 is lowered to the lowermost end of the guide pipe 7. Excavation work can be performed. Accordingly, the lifting stroke of the auger driving device 5 is increased, and the excavation length can be increased with a short leader, and the length of the auger screw and the casing can be shortened. The performance is improved. Therefore, a small pile driver 1 can be used. Further, since the lower guide 14 is detachable from the auxiliary reader 12, the lower guide 14 can be removed at the time of transportation or the like.
[0011]
In the above embodiment, the lower guide is used as the casing steady rest. However, an auger screw steady rest, a pile holder or the like may be used, and another fluid pressure cylinder or electric cylinder may be used as the cylinder.
[0012]
【The invention's effect】
As described above, the pile driver of the present invention has the lower guide removably provided in the pin hole of the auxiliary leader that protrudes and retracts from the lower end of the leader with the cylinder provided inside the lower part of the leader. Since the guide can be brought closest to the ground surface, and the work equipment can be lowered to the lowermost end of the leader for excavation work, the excavation length can be deepened with a short leader, and the center of gravity of the pile driver is lowered. Stability is improved. Thereby, a small pile driver can be used.
[Brief description of the drawings]
FIG. 1 is a cutaway view of a lower portion of a leader showing an embodiment of the present invention. FIG. 2 is an enlarged side view of the same pile driver. FIG. 3 is a pile driver with a lower guide closest to the ground surface. [Figure 4] Side view of pile driver during normal excavation work [Figure 5] Side view of pile driver with auxiliary reader stored at the bottom of reader
DESCRIPTION OF SYMBOLS 1 ... Piling machine, 2 ... Base machine, 3 ... Leader, 3a ... Upper leader, 3b ... Lower leader, 3d ... Pin hole, 5 ... Auger drive device, 11 ... Hydraulic cylinder, 11a ... Rod, 12 ... Auxiliary leader, 12a: pin hole, 13: pin, 14: lower guide, 14c: pin hole

Claims (1)

A stake that supports an auxiliary reader that protrudes and retracts from the lower end of the reader with a cylinder provided inside the lower part of the reader, and inserts and holds the auxiliary reader housed in the reader by inserting pins into pin holes formed in the auxiliary reader and the reader. A pile driving machine, wherein a lower guide is detachably provided in a pin hole of an auxiliary leader projecting from a lower end of the leader.

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