JPH0640666Y2 - Telescopic leader for pile driver - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a leader (guide rail) for guiding a monken (weight) required for a hammer-driving pile driving machine for construction and civil engineering, It is used in this field.

[Conventional technology and its problems]

The so-called hammer drop type pile driving machine is widely used for driving a relatively large number of dispersed piles. It is well known that it is used by dropping. In order to make it possible to transport such a long leader, it has conventionally been divided into several units and bolted or jointed with pins at the site to lengthen them for use. Therefore, another truck is required to carry the replenishing unit, and there is a problem that it takes a long time (tens of minutes to half a day) for assembling and disassembling work on site. Further, in the case of a site with a roof, when the pile is hit in the vertical groove, the leader hits the ceiling and cannot be set, so it takes a lot of time and labor to lower the car body into a hole provided in advance. Even if the leader is made extendable, it is considered impossible to put it into practical use at all because it has a step at the connecting portion, which catches a vertically moving Monken.

[Technical means for solving problems]

The present invention has been made to solve the above problems, and will be described with reference to the drawings. In a leader (a) attached to a hammer drop type pile driver (A), the leaders (a) are slidably connected to each other. This consists of the upper, middle and lower units, and the upper unit (1,
2) consists of an upper thick part (1) to be attached to the boom (b) and an inner cylinder part (2) which is narrower and extends downward. The outer diameter of the middle unit (3, 4) is equal to the upper thick part (1). , A cylindrical body (3) having an inner diameter substantially equal to the outer diameter of the inner cylindrical portion (2) and having a fixed spacer (4) on the lower inner wall thereof, the lower unit (5,
6) is a lower thick portion (5) having an outer diameter substantially equal to that of the upper thick portion (1) and extending upward therefrom, and has an outer diameter substantially equal to the inner diameters of the inner cylindrical portion (2) and the fixed spacer (4). A guide rail (7) formed of a mandrel portion (6) and having the same track is formed on the outer side of the mandrel portion (6) to make a leader (a) that is expandable and contractible and has no steps.

〔Example〕

More specifically, as shown in FIG. 3, one side of the outer diameter of the upper thick part (1) of the upper unit (1, 2) and the height are approximately 0.5 m, which is a substantially cubic shape. Has a protrusion (8) to be inserted into the guide rail (7) of the lower middle unit (3, 4), and the inner cylinder part (2) extending below it and the middle unit (3, 4) is a regular square tube shape suitable for sliding, the length of the middle unit (3, 4) is about 5.5 m, and the fixed spacer (4) below it is integrally formed with a size that meets the above conditions. To be done.
Further, the mandrel portion (6) of the lowermost thin unit (5, 6) is also a square prism, and the lower thick portion (5) is the unit (1,
2) It has almost the same shape and size as the upper thick portion (1), and the four lower leg portions (9) are provided at the lowermost portion.

It is possible to easily move the middle unit (3, 4) up and down by operating the lever in the driver's seat by a known method.
Attach the hydraulic motor (10) as shown in Fig. 5 to the boom (also considered as a part of the boom (b) in the present invention).
Forward / reverse rotation is controlled by the book hydraulic hose (11), and the bearing (13) is supported by the speed reducer (12) and coaxially connected to the winch (14), where the wires (15) are discarded and wound. Be done. The tip of the wire (15) is fixed to the grip (16) on the outer wall of the tubular body (3) as shown in FIG.
The hydraulic hose (11) is introduced into the driver's seat as shown in FIG. 1, and when the valve (lever) is operated to rotate the hose normally, the winch (14) winds up the wire (15) to form a tubular body (3). Is moved upward, and when it is reversely rotated, it moves downward due to its own weight.

[Action and effect]

As described above, according to the present invention, the entire length of the leader can be freely expanded and contracted by sliding the mandrel portion (6) of the lower unit in the inner cylindrical portion (2) of the upper unit, and further, a step is created. No, the movement of Monken is actually a medium unit (3,
It can be kept within the range of 4). Therefore, since it can be transported in a shortened state without being divided, an extra transportation truck is not required, and on-site work does not require assembly or disassembly involving bolt tightening, etc. It can save time and effort. Further, even in the case of a site with a roof, it is not necessary to provide a hole for lowering the vehicle body, and the application range is widened, which is a great effect.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of the entire pile driving machine using the leader of the present invention, FIG. 2 is a schematic sectional view showing the leader of the present invention, and FIG. 3 is a sketch showing a concrete example of the leader of the present invention. 4 is a side view showing the outline of a conventional pile driver, FIG.
The figure is a side view showing an example of a portion to which a hydraulic motor is attached. A ... Pile driver, a ... Leader b ... Boom, c ... Head 1,2 ... Upper unit, 1 ... Upper thick part 2 ... Inner cylinder part, 3,4 ... Medium unit 3 ... … Cylindrical body, 4 …… Fixed spacer 5,6 …… Lower unit, 5 …… Lower thick section 6 …… Mandrel section, 7 …… Guide rail 8 …… Projection, 9 …… Leg section 10 …… Hydraulic motor , 11 …… hydraulic hose 12 …… reducer, 13 …… bearing bearing 14 …… winch, 15 …… wire 16 …… grip

Claims (1)

[Scope of utility model registration request] 1. A leader mounted on a hammer drop type pile driving machine, which is constituted by three upper, middle and lower units slidably connected to each other, and
The upper unit is composed of an upper thick part to be attached to the boom and an inner cylindrical part that is narrower and extends downwardly.The middle unit is a cylindrical body whose outer diameter is the upper thick part and whose inner diameter is approximately equal to the outer diameter of the inner cylindrical part. The lower unit has a fixed spacer on its lower inner wall, and the lower unit has an outer diameter substantially equal to the upper thick portion, and a lower thick portion extends upward and has an outer diameter substantially equal to the inner diameters of the inner cylindrical portion and the fixed spacer. A telescopic leader for a pile driver, which comprises a mandrel part and guide rails formed on the outside of the mandrel so as to have the same track.