JP3672024B2 - Pile driver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leader of a pile driving machine capable of easily performing a connecting work and a connecting work of a leader structure.
[0002]
[Prior art]
Pile driver leaders have connecting flanges at both ends so that they can be divided into multiple parts for transportation, to accommodate the length of piles to be constructed, or to limit the sky at construction sites. The leader structure is connected, but the conventional leader structure is such that a rib is welded to the connecting flange welded to both ends of the main pipe, and two guide pipes parallel to the rib are welded. A working device such as an auger or a hammer is attached to a guide gib that slidably holds the guide pipe.
[0003]
[Problems to be solved by the invention]
However, it is inevitable that the rib will deform due to the influence of welding heat and an error will occur in the guide pipe mounting accuracy, and the guide pipe will shift when connected to other leader components, and the guide gib will operate smoothly. Therefore, an expensive welding restraint jig is prepared for each type of leader structure, or welding is performed while ignoring compatibility, and correction is performed by matching the actual products.
[0004]
An object of the present invention is to solve such a problem, and to provide a leader of a pile driving machine that can be manufactured at low cost and can ensure the compatibility of the leader structure.
[0005]
[Means for Solving the Problems]
As a means for solving such a problem, the leader of the pile driving machine according to claim 1 is characterized in that the guide pipe is provided at a corresponding position of each peripheral edge of the connecting flange fixed to both ends of the main material pipe. Two rings having an outer shape that coincides with a part of the outer shape are integrally formed with a space therebetween, and a guide pipe is passed between the corresponding rings to be welded to form a leader structure. The leader structure was connected by tightening bolts and nuts passed through the connecting flange.
[0006]
The leader of the pile driving machine according to claim 2 is characterized in that the inner and outer circumferences of the ring are machined in the invention according to claim 1.
[0007]
The leader of the pile driver according to claim 3 is the invention according to claim 1 or 2, wherein the joint pin is tightly fitted to one of the corresponding rings and the gap is fitted to the other. And
[0008]
Operation and effect of the invention
According to the first aspect of the present invention, the connecting flange has a large thickness, the ring is integrally formed on the connecting flange, and the rigidity is high. Therefore, distortion due to welding heat is small, and an expensive jig is used. Without this, the guide pipe can be accurately welded, and compatibility is improved.
[0009]
According to invention of Claim 2, the processing precision of the inner and outer periphery of a ring improves, and a guide pipe can be welded more correctly.
[0010]
According to the third aspect of the present invention, the reader components can be easily connected to each other.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
In FIG. 1, reference numeral 2 denotes a self-propelled base machine, and a leader 4 having a required length is erected by an arm 6 and a backstay 8 at the front thereof.
[0012]
Leader 4 is connected to several leader structures 5a, 5b, 5c, 5d, and 5e for reasons of transportation, to cope with the length of the pile to be constructed, or for the purpose of limiting the sky at the construction site. It is configured.
[0013]
As shown in FIGS. 3, 4, and 5, each leader component 5 includes a main pipe 10 in which a convex portion 13 is formed on the inner periphery of the lower end, and a concave portion 15 is formed on the inner periphery of the upper end. The connecting flange 12 is welded to the lower end of the upper end and the connecting flange 14 is welded to the upper end via the rib 16.
[0014]
The connecting flanges 12 and 14 are integrally formed with projecting portions 18 at corresponding positions forming 90 ° with each other, and rings 20 whose outer periphery of 270 ° or more forms a circle are integrally formed at both ends of each projecting portion 18, The inner and outer peripheries are machined.
The outer periphery of the ring 20 only needs to have a circumference of about 180 °.
[0015]
Between the rings 20 corresponding to each other in the vertical direction, guide pipes 22 are passed and welded, and each guide pipe 22 is reinforced by being welded to the main material pipe 10 via the longitudinal rib plate 24, Corresponding vertical rib plates 24 are reinforced by welding horizontal rib plates 26 at regular intervals.
The number of protrusions 18 may be one, and the guide pipe 22 may be a square pipe.
[0016]
As shown in FIG. 6, the base portion of the joint pin 31 is press-fitted into the inner periphery 36 of the ring 20 of the lower flange 12 and the tip portion thereof is tapered, so that the inner periphery of the ring 20 of the lower leader structure 5 is provided. 32 is fitted into the gap.
[0017]
In order to configure the reader 4 by connecting the leader components 5a, 5b,..., As described above, the joint pin 31 protruding from the ring 20 of the lower connecting flange 12 of the upper reader component 5 is connected to the lower pin. It fits into the ring 20 of the coupling flange 14 on the upper side of the leader structure 5, and the convex portion 13 of the coupling flange 12 on the lower side of the upper leader structure 5 and the coupling flange 14 on the upper side of the lower level leader structure 5. What is necessary is just to tighten the volt | bolt 37 and the nut 38 which let the recessed part 15 pass, and let the mounting hole 17 formed in alignment with the upper and lower flanges 12 and 14 of each leader structure 5 mutually.
[0018]
In the present embodiment, the guide pipe 22 is directly welded to the ring 20 integrated with the flanges 12 and 14, and the inner and outer peripheries of the ring 20 are machined. 20 are connected without a step.
[0019]
For this reason, as shown in FIG. 2, when a pinion 34 driven by a motor attached to a working device 28 such as an auger driving device is engaged with a rack 35 fixed to the reader 4, the auger, hammer, etc. The two guide gibbs 30 fixed to the working device 28 slide smoothly on the guide pipe 22, and the working device 28 moves up and down smoothly, and the compatibility of the leader structure 5 is high, so that correction work is performed. It is possible to quickly change the connection.
[0020]
The present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the gist of the present invention.
[Brief description of the drawings]
FIG. 1 is a side view showing the entire reader.
FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.
FIG. 3 is a partially cutaway side view of a reader structure.
FIG. 4 is a plan view thereof.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a cross-sectional view showing fitting of joint pins.
[Explanation of symbols]
4: Leader 5: Leader structure 10: Main material pipe 12, 14: Connecting flange 18: Protrusion 20: Ring 22: Guide pipe 28: Working device

Claims (3)

Two rings having an outer shape coinciding with a part of the outer shape of the guide pipe are integrally formed at a corresponding position on the periphery of each of the connecting flanges fixed to both ends of the main pipe and spaced apart, and correspond to each other. The guide pipe is passed between the rings and welded to form a leader structure, and a plurality of the leader structures are connected by tightening bolts and nuts passed through the connecting flanges. Machine reader. The leader of the pile driving machine according to claim 1, wherein the inner and outer circumferences of the ring are machined. The leader of the pile driving machine according to claim 1 or 2, wherein a joint pin is tightly fitted to one of the corresponding rings and a gap is fitted to the other.

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