JPS5930055Y2 - Leader in pile driving machines - Google Patents

Description

[Detailed explanation of the invention] It is said that it is desirable for the leader of a pile driver to be as long as possible and to be a single piece with no additions. Alternatively, since various problems occur during manufacturing, a desired leader is obtained by adding a plurality of short divided leaders.

By the way, it is certainly possible to deal with various problems in transportation, work environment, and manufacturing by adding a plurality of divided leaders as described above, but each divided leader in the conventional reader of this type The connection between them is made by joining flanges fixed to each end of the connecting side and the connected side, and then tightening and fixing them with multiple bolts. (1) When connecting each divided reader, it is difficult to assemble because it has to be laid down on the ground.

(2) Since the flange portion protrudes to the outside of the leader, the leader becomes larger and it is difficult to weld the leader and the guide rail.

(3) Obstacles such as piles may come into contact with the flange (including bolts) and cause damage.

Due to these secondary defects, it was not a good choice as a practical leader among pile drivers.

Therefore, this invention aims to provide a leader for pile driving machines that can solve the above-mentioned problems.

Hereinafter, a specific example of this invention will be explained based on the drawings.The leader 1 of this example has a rectangular cross-section groove in which each cover plate 3 is welded between guide rails 2 made of round steel pipes arranged at the four corners, similar to the known one. 4 is this leader 1
The upper divided leader 5 at a certain point is a lower divided leader connected to the upper divided node 4.

The lower end of the upper divided leader 4 is not closed by a blind plate or the like, and the inner periphery is extended to form a drilled hole 6, and a pin through hole 6 is formed in the center arrow portion of the drilled hole 6.
A is penetrated, and a blocking plate 8 having blank holes 7 arranged at the same pitch is fixed to the opposite side of the conical hole 9.

In addition, a blind plate 9 welded to the cover plate 3 is installed at the upper end of the lower divided leader 5 with a diameter slightly smaller than that of the drill hole 6, and its top plate is provided with the same pitch as the blind holes 7 of the blocking plate 8. It has a rectangular insertion male body 12 which is inserted into the conical hole 6 and passed through a pin through hole 11 that matches the pin through hole 6a when joining is fixed in the center part. ing.

To connect the lower divided leader 5 to the upper divided leader 4, insert the male insert 12 into the drilled hole 6, join the lower divided node 5 to the upper divided leader 4, and match. Pins 13 are inserted into pin through holes 6a and 11.
Insert and install to connect both divided leaders 4 and 5,
Next, on the upper surface of the blocking plate 8, there are holes 14 arranged at the same pitch as the holes 7 provided in the blocking plate 8,
A rectangular holding plate 15 with a diameter slightly smaller than the inner diameter of the divided leader 4 is fitted so that the bolt holes 14 are aligned with the blank holes 7, and a bolt 16 is installed in each bolt hole 14 and inserted, and the male body 12 is inserted. Pull it under tension to the blocking plate 8 side and fix it.

Note that when the two divided leaders 4 and 5 are connected, the holding plate 15 is inserted through a punched hole 17 formed in the cover plate 3 near the connection part of the upper divided leader 4, and the tightening of the pole 16 to the pole 1 is also done through this punched hole. Insert your hand from step 17.

Further, this presser plate 15 has protrusions 15a and 15b for clamping as shown by imaginary lines formed on one surface thereof, and between these protrusions 15a and 15b, the leader 1 (in this case, the upper node When the removable support pin 18 installed in the through hole formed in step 4) is passed through, the presser plate 15 is held on the blocking plate 8 side by the support pin 18.
Contrary to the example, the male body 12 is the -L side split leader 4.
If the drilled hole 6 is located in the lower divided leader 5 and the structure is such that the holding plate 15 is applied to the lower surface of the blocking plate 8, hold it down by hand each time to prevent it from falling when connecting the divided leader. This is very useful because there is no need to take it out and manage it separately when the connected divided reader is disassembled and transported as a single unit.

Further, four holes 7, 10 and 14 are provided for mounting the bolts 16.

Reference numeral 19 in the figure is a guide pin provided at the end of the guide rail 2 of the upper leader 4.
It is inserted into the inside of the guide rail 2 to connect both divided leaders 4 and 5 vertically.

As described above, the leader of the pile driver according to this invention has the upper and lower divided leaders 4 and 5 to be connected, and the female part (in the embodiment, the female part formed at the end of the divided leader itself) The male part 12 formed at the end of the other divided leader itself (in the embodiment, the insert male part provided in the lower divided leader 5) is fitted into the drilled hole provided in the drilled hole) 6 to connect the male and female parts. An insertion pin 13 is inserted into the joining part to connect the two divided leaders, and the tip of the male part 12 is fixed to the fixing part (blocking plate in the embodiment) 8 provided in the female part 6 by an appropriate fixing means. Because it has a structure in which each divided reader is connected by laying it down on the ground, unlike the conventional flange connection method, it is possible to connect both divided leaders to be connected as described in the example. Then, since they can be connected with pins, they can be connected while suspended by a crane, making assembly easy.Moreover, the connecting components do not protrude as in flange connections, so there is no need for a node. The guide rails do not become large, the guide rails can be easily welded, and there is no need for contact with obstacles that may cause damage.

Furthermore, according to the leader of this idea, even if bending force is applied to the leader during press-fitting of piles by winding the winch, buckling will not occur because the joint is a concave-convex fit. When this bending force is applied, even if the bending force is concentrated on the insertion pin and shearing force is applied to the insertion pin, this shearing force is absorbed by the fixed part and becomes very small, so the pin diameter is small. There is no risk of the insertion pin being worn or sheared, and even if the insertion pin were to be sheared, the two split leaders remain connected by the fixed parts, making it extremely safe. , which is of high value as a practical leader structure for pile driving machines.

It should be noted that this invention is not limited to the structure of the embodiment, and it goes without saying that various design changes may be made within the scope of the technical idea described in the claims of the utility model registration.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway side view showing essential parts of an embodiment of the invention, and FIG. 2 is a sectional view taken along line A-A. 1... Leader, 2... Guide rail, 3... Cover plate, 4... Upper split leader, 5... Upper split leader 6...Weaning, 6a...Pin through hole, 7...Blind hole, 8...Blind plate, 9...Blind plate ,
10... Screw hole, 11... Pin through hole, 12... Male insertion body, 13...
Insert pin, 14... Bolt hole, 15...
... Pressing plate, 15a, 15b ... Clamping protrusion, 16 ... Bolt, 17 ... Punching hole,
18...Support pin, 19...Guide pin.

Claims (1)

[Scope of utility model registration request] In a plurality of split leaders connected vertically, a male body is provided protruding from one end of each, a drilled hole is recessed at the other end, and a punched hole is formed in the male body and the leader wall adjacent to the drilled hole. A pin through hole is provided in the side wall of the male body toward the opposite side, a fitting part is formed at the tip of the male body, and the conical hole communicates with the pin through hole of the male body in the side wall. A pin passage hole is formed through the weaning member, and a fitting body that fits with the fitting part of the male body is attached to the weaning bottom, and the male body of another divided leader is inserted into the conical hole of the other divided leader. A leader of a pile driver, characterized in that they are fitted together and a pin is fitted into both pin through-holes to connect them, and the fitting body is fitted into a fitting part to be solidified as one body.