JP3990201B2 - Pile driver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pile driving machine in which a steady rest of a pile rotated by a pile rotation driving device is attached to a lower part of a leader.
[0002]
[Prior art]
In some pile driving machines, in order to maintain the verticality of the pile by suppressing the horizontal displacement of the pile buried in the ground, a pile steadying device is attached to the lower part of the leader. For example, the pile driving machine 1 shown in FIG. 8 has guide pipes 5 for guiding the lifting and lowering of the pile rotation driving device 4 on the left and right side surfaces of a square-shaped leader 3 standing on the front part of the base machine 2. The guide pipes 6 and 6 of the pile rotation driving device 4 are engaged with both guide pipes 5, and the pinion 9 of the lifting hydraulic motor 8 of the pile rotation driving device 4 is attached to the rack 7 provided on the front surface of the leader 3. The pile rotation driving device 4 is guided and raised by the guide pipe 5 by the rotation of the lifting hydraulic motor 8. At the lowermost part of the leader 3, a steady rest 11 for the pile 10 that is rotationally press-fitted by the pile rotation driving device 4 is provided. This steady rest 11 is connected to a bracket 12 provided on the lowermost front surface of the reader 3 by connecting a pair of left and right arms 13 by pins 14 so that the arms 13 can be opened and closed. Stabilize the pile 10 between them.
[0003]
[Problems to be solved by the invention]
However, in the above-described configuration, when the pile rotation driving device is lowered to the lower part of the leader, the guide gib is in contact with the bracket and the lowering is restricted, and the pile cannot be buried deeper. In particular, in a low head type pile driver equipped with a short leader that is used indoors or under a height-restricted site, it is impossible to embed a pile deeply because a short pile is added and buried. Even if it is only the height of the steady rest, the effect on the overall length of the pile is large, the length of the second and subsequent piles to be added is shortened, the number of piles to be added is increased, and the pile rotation drive The number of piles attached to the device will increase and construction efficiency will deteriorate.
[0004]
Further, if the length of the reader is to be extended within a limited overall height, it is necessary to extend the lower end of the reader to the level of the ground surface. On the other hand, the enforcement site is often rough terrain, and when the lower end of the leader is extended to the level of the ground, the lower part of the leader or the steady rest hits obstacles such as stones and the unevenness of the ground, and the running / pile alignment / sway Will interfere with the opening and closing of the arm.
[0005]
Therefore, the present invention provides a pile driving machine that can lower the pile rotation drive device to the lowest part of the leader having a steady rest at the lower part and embed the pile deeply, and can be carried out and moved without trouble even on rough terrain. It is intended to provide.
[0006]
[Means for Solving the Problems]
The present invention has a guide pipe that guides the lifting and lowering of a pile rotation driving device on a leader standing on the front part of a base machine, and a pair of left and right arms that prevent a pile rotated by the pile rotation driving device The guide pipe is provided to the lowermost end of the leader, and a bracket for attaching the arm so as to be horizontally rotatable is provided at a position that does not interfere with the lifting and lowering of the pile rotation driving device at the lowermost part of the leader. In addition, a soil discharge plate is provided on the front surface of the pair of left and right arms . Thereby, when a pile driving machine moves and enforces on obstacles, such as a stone roller, and an uneven field, obstacle removal and leveling work can be performed. When the leader has a square cross section, it is preferable that the guide pipe is provided near the front of the left and right sides, and the bracket is provided near the back of the left and right sides. but it may also be provided with the bracket.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a low-headed pile driver will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same element as the said prior art example. The pile driver 1 is provided with a short leader 3 on a front bracket 20 at the front of a self-propelled base machine 2 so as to be pivotable in the longitudinal direction of the vehicle body. 3 is supported from the rear, and the leader 3 is erected or laid down by expansion and contraction of the leader hoisting cylinder 21. When the leader 3 is erected vertically, the lowermost end is located at the bottom of the ground surface.
[0008]
The leader 3 has a rectangular cross section and is provided with guide pipes 5 for guiding the lifting and lowering of the pile rotation driving device 4 from the uppermost side to the lowermost side near the front surface on both the left and right sides, and for raising and lowering the pile rotation driving device 4 on the front surface. A rack 7 is provided.
[0009]
The pile rotation drive device 4 includes a guide give 6 that engages with the guide pipe 5, a pile rotation hydraulic motor 23 that rotates a pile cap 22 on which the pile 10 is mounted, and a lifting hydraulic pressure that meshes the pinion 9 with the rack 7. And a motor 8, which is guided by the guide pipe 5 by the rotation of the lifting hydraulic motor 8 and moves up and down along the leader 3.
[0010]
Brackets 24 for attaching a pair of left and right arms 13 constituting the steady rest 11 of the pile 10 are respectively provided on the left and right side surfaces of the lowermost part of the reader 3. Each bracket 24 is provided at a position that does not interfere with the guide gibbs 6 that raise and lower the guide pipe 5, that is, at a position that is sufficiently spaced so as not to contact the guide gibbs 6 on the back side of the reader 3 on the base machine side. The arm 13 is attached to each bracket 24 by a pin 14 so as to be horizontally rotatable.
[0011]
Each arm 13 is formed in a shape that is substantially straight after bulging outward from the base connected to the bracket 24 so as to avoid the guide pipe 5, and the insertion hole of the pile 10 is slightly closer to the distal end from the opposite inner middle part A semicircular arc-shaped recess 13a is formed, and an engagement groove 13b of the rotation engagement protrusion 10a of the pile 10 is formed in the recess 13a. Further, an insertion hole 13c for a pin 25 that holds both arms 13 in a closed state is formed near the tip of each arm 13. Furthermore, on the foremost surface of each arm 13, a flat earth discharging plate 26 formed of an iron plate is provided by welding.
[0012]
With this configuration, when the pile 10 having the spiral blade 10b is embedded in the lower portion, the rotation protrusion of the pile 10 is placed on the pile cap 22 of the pile rotation driving device 4 pulled up on the upper portion of the leader 3. 10a is engaged, the pile 10 is mounted on the pile cap 22, both arms 13 of the steady rest 11 are opened, and the pile rotation drive device 4 is lowered while the pile rotation drive device 4 rotates the pile 10. When the pile 10 is press-fitted into the ground and the spiral blade 10 b passes the position of the steady rest 11 as shown in FIG. 1, both the arms 13 are closed and kept closed by the pins 25. The rotation press-fitting work of the pile 10 is continued while keeping the steady rest of 10. When the pile rotation driving device 4 is lowered to the lower part of the leader 3, the pins 25 are pulled out and both arms 13 are opened wide so as not to prevent the lowering of the pile rotation driving device 4. To lower.
[0013]
Accordingly, as shown in FIG. 2, the pile rotation driving device 4 can be lowered to the level where it can be lowered without being disturbed by the steady rest 11, so that the pile 10 is buried deeper than before. Can do. When the next pile 27 is screwed into the buried pile 10, as shown in FIG. 3, the engaging protrusion for rotation of the pile 10 buried in the engaging groove 13 b of both arms 13. 10a is engaged, the pile 10 is fixed, the pile 27 attached to the pile cap 22 of the pile rotation drive device 4 pulled up to the top of the leader 3 is rotated, and the tip of the pile 27 is screwed into the pile 10 to be joined. Add. When the addition is completed, the arms 13 are slightly opened to disengage the engagement grooves 13b and the rotation engagement projections 10a, and the pile rotation drive device 4 is lowered while the pile rotation drive device 4 rotates the pile 27. The pile 27 is press-fitted into the ground, and when the rotation engaging projection 10 a passes the position of the steady rest 11, both arms 13 are closed and the pile 27 is kept steady with both arms 13 in the same manner as described above. Continue the press-fitting work. When the pile rotation driving device 4 is lowered to the lower part of the leader 3, the both arms 13 are opened widely and the pile rotation driving device 4 is lowered to the lowermost end of the leader 3 so as to be buried deeply. Add.
[0014]
Thus, since the pile 10 is buried deeper than before by lowering the pile rotation drive device 4 to the level of the ground surface, it is possible to use a pile longer than the conventional pile for the pile to be added. By reducing the number, it is possible to reduce the number of piles mounted on the pile rotation drive device and improve the enforcement efficiency. Moreover, the lifting / lowering stroke of the pile rotation driving device 4 can be made substantially the same as the entire length of the reader 3 by raising and lowering the pile rotation driving device 4 along the leader 3 by the rack and pinion method.
[0015]
Moreover, since there are many rough terrain in the pile driving work site, when the pile driving machine 1 travels and moves, obstacles such as clumps and stones or irregularities on the ground are removed by the earth removal plate 26 or leveled. The work can be performed and the pile driving machine 1 can travel without any trouble. Further, when performing, it is possible to eliminate the obstacles on the ground and to perform leveling work, which are performed by the earth discharging plate 26.
[0016]
FIG. 5 shows a second embodiment in which the earth discharging plate 26 is a flat rubber plate and is attached to the forefront of each arm 13 with a bolt 28. FIGS. 6 and 7 show a third embodiment in which a soil discharge plate 26 inclined rearward is provided on the forefront of each arm 13 and each soil discharge plate 26 becomes wedge-shaped when each arm 13 is closed. Is shown. Even in these configurations, the same effects as the earth discharging board of the first embodiment can be obtained.
[0017]
In the embodiment described above, the bracket is provided near the back of the left and right side surfaces of the short reader having a square cross section. However, the bracket may be provided on the back that is the surface facing the base machine of the reader. In the case of a reader having a round cross section, the reader is preferably provided from the side to the back. Furthermore, the present invention can of course be applied to a pile driving machine equipped with a general long leader, and the lifting and lowering method of the pile rotation driving device is not limited to the rack and pinion method, but also the chain and sprocket method, A method of suspending from a top sheave at the top of the leader with a wire rope may be used.
[0018]
【The invention's effect】
As described above, according to the present invention, since the pile rotation driving device can be lowered to the level of the bottom surface of the leader and the pile can be buried deeper than before, the pile to be added on the pile is longer than before. Pile can be used, the number of piles to be added can be reduced, the number of piles mounted on the pile rotation drive device can be reduced, and the execution efficiency can be improved. In addition, by providing a soil removal board in the forefront of the pile steadying, when moving or implementing the pile driver at the site with obstacles such as stone rollers and unevenness, obstacles can be eliminated and leveling work, It is possible to move the pile driver without hindrance and improve the enforcement efficiency.
[Brief description of the drawings]
FIG. 1 is a side view of an initial stage of pile embedding by a pile driving machine according to an embodiment of the present invention. FIG. 2 is a side view of a pile rotating drive device lowered to the lowest end of a leader. Side view with the next pile added to the pile [Fig. 4] Plan view of the steady rest [Fig. 5] Side view showing the second embodiment of the earth removal board [Figure 6] Third embodiment of the earth removal board Plan view showing an example [FIG. 7] Side view showing a third embodiment of the earth removing board [FIG. 8] Side view of a conventional pile driver [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pile driver, 2 ... Base machine, 3 ... Leader, 4 ... Pile rotation drive device, 5 ... Guide pipe, 10 ... Pile, 11 ... Stabilizer, 13 ... Arm, 14 ... Pin, 24 ... Bracket, 26 ... Excavation board

Claims (2)

A pile provided with a guide pipe that guides the lifting and lowering of the pile rotation drive device and a pair of left and right arms that prevent the pile rotated by the pile rotation drive device on a leader standing on the front part of the base machine in striking machine, provided with the guide pipe to the lowermost end of the reader, the bracket mounting the arm horizontally angularly movable, provided at a position not interfering with the lifting of the reader lowermost of said pile rotary drive device, wherein the right and left Pile driver characterized in that a soil removal board is provided in front of the arm .   2. The pile driving device according to claim 1, wherein the leader has a square cross section, and the guide pipe is provided near the front surface of the left and right side surfaces of the leader, and the bracket is provided near the back surface of the left and right side surfaces. Machine.

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