JPS6136580Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rope interference prevention device for preventing interference between a leader lifting pendant rope and a wire rope for lifting a pile hammer and earth auger in a leader rotary pile driver. be.

A rotary leader is generally used to selectively use a pile hammer and an earth auger, which are provided with different phases, according to a work procedure. The general configuration of a pile driver equipped with this rotary leader is explained in the fifth section.
This is shown in FIGS. 7 to 7.

A is a base machine, B is a leader established at the front of the base machine A, C is a leader support that supports the lower end of the leader B, and D is a pair of left and right stays that support the upper part of the leader. Reader support C
A leader base E and a leader holder F, each serving as a rotating support body equipped with a rotating bearing mechanism, are provided at the front end of the stay D and at the upper end of the stay D, respectively. It is supported so that it can rotate within a predetermined angle range (usually 90 degrees). G is a wire rope for pulling up the leader, which connects the upper and lower spreaders via the gantry H.
It is hung between I ₁ and I ₂ . J ₁ and J ₂ are a pair of left and right pendant ropes whose lower ends are fixed to the upper spreader I ₁ , and the upper ends of the ropes J ₁ and J ₂ are fixed to the lower outer peripheral surface of the leader holder F in the leader B, The leader B is pulled up by the wire rope G for pulling up the leader and the pendant ropes J ₁ and J ₂ . K ₁ and K ₂ are wire ropes for lifting working equipment (pile hammer and earth auger), and these wire ropes K ₁ and K ₂ are connected to a pendant rope J ₁ from a drum (not shown) mounted on base machine A. ，
It is stretched between the point sheave block L and the pile hammer and earth auger through _J2 .
M is a guide sheave for the wire ropes K ₁ and K ₂ and is provided on the outer periphery of the leader holder F.

In such a pile driver, pendant ropes J ₁ , J ₂ and wire ropes K ₁ ,
A problem arises in that, due to the rotation of leader B, K ₂ and K 2 interfere with each other at their intersections, causing damage to both. For this reason, conventionally, as shown in Figure 8,
At the intersection of the pendant ropes J ₁ , J ₂ and the wire ropes K ₁ , K ₂ for lifting working equipment, a rope support N in the form of a prong rod is installed between the pendant ropes J ₁ , J ₂ to widen the distance between the two ropes. When installed, this rope support N maintains a constant gap between the pendant ropes J ₁ , J ₂ and the wire ropes K ₁ , K ₂ for lifting working equipment, regardless of the rotation of the leader B, and prevents interference between them. We are trying to prevent this.

However, since the interference position of the rope varies depending on the length of the leader, the conventional method described above has the trouble of having to change the mounting position of the rope support N depending on the length of the leader. Moreover, since this rope support N must be set at the actual rope interference position, the attachment of this support N must be carried out at a height after the leader stands up. Therefore, installation was troublesome and dangerous.

Therefore, the present invention aims to provide a rope interference device for a pile driver, which can be installed at a fixed position regardless of the leader length, and which can be installed easily and safely on the ground before the leader is erected. It is something to do.

The present invention is characterized in that the base machine includes a rotary leader whose upper and lower ends are rotatably supported by upper and lower rotary support mechanisms, respectively, at the front of the base machine; In a pile driving machine, the upper ends of a pair of left and right pendant ropes for pulling the leader are fixed to the lower outer peripheral surface of the pile driver, and a wire rope for lifting a work device such as a pile hammer is stretched across the two pendant ropes. A rope guide mounting frame is provided to project downward from the outer periphery of the upper rotating support, and the pendant rope is attached to the rope guide mounting frame in the horizontal direction at a position above the intersection with the wire rope for lifting the working equipment. A rope guide for a pile driver is provided, the rope guide being passed through with its position regulated, and only a portion of the pendant rope above the rope guide moves in the left-right direction as the leader rotates. Interfering device.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

1 is a leader, 2 is a leader holder as an upper rotating support body that rotatably supports the upper part of the leader 1, 3, 3 is a pendant rope, and 4, 4 is a wire rope for lifting a working device (hereinafter, simply a lifting 5 is a guide sheep for the lifting ropes 4, 4. The configuration up to this point is the same as the conventional one, so a detailed explanation will be omitted.

A bracket 6 is provided on the underside of the stay mounting bracket 2a provided on the rear surface of the leader holder 2, and a guide sheave mounting frame 7 is attached below the bracket 6 so as to be rotatable back and forth around a horizontal axis 8.
The sheave block 9 is attached in a T-shaped arrangement, and three pendant rope guide sheaves 10, 11, and 12 are rotatably mounted on the sheave block 9 in close proximity to each other in the left-right direction. Reference numerals 13, 14, and 15 denote the rotation support shafts of the guide sheaves 10, 11, and 12. Of these, the support shaft 14 of the intermediate guide sheave 11 is connected to the sheave block 9 relative to the guide sheave mounting frame 7.
In this case, the intermediate support shaft 14 is connected to the guide sheave mounting frame 7 via a spherical bearing 16 as shown in FIG. 4, whereby the entire sheave block 9 is mounted on the frame 7 so as to be rotatable in all directions.

However, the left and right pendant ropes 3, 3 are
From the part that intersects with the lifting ropes 4, 4 with a predetermined gap, both the left and middle guide sheaves 10, 1
1, middle and right side guide sheaves 11, 12
The upper end is fixed to the lower outer circumferential surface of the leader holder 2 in the reader 1 through the gap.

In this configuration, the pendant ropes 3, 3
For example, when working with a pile hammer, both the middle and right guide sheaves 1 are moved at a position above the intersection with the lifting ropes 4, 4, as shown by the solid line in Figure 3.
1 and 12 and reaches the leader 1. During the earth auger work, the rotation of the leader 1 causes both the left and middle guide sheaves 1 to
0 and 11 to reach reader 1. That is, the pendant ropes 3, 3 are connected to the guide sheave 1.
Only the parts above 0, 11, 12 move left and right as the leader 1 rotates, and the lifting ropes 4, 4
The same sheave 10, 11, 12 including the intersection with
The lower portion is always kept at a constant position and at constant intervals regardless of the rotation of the leader 1. Therefore, since a gap is always maintained between the pendant ropes 3, 3 and the lifting ropes 4, 4 at their intersections, interference between the two ropes 3, 4 is reliably prevented.

When using this device, as described above, the pendant ropes 3, 3 are placed not at the intersection with the lifting ropes 4, 4 as in the conventional case, but directly below the leader holder 2, which is located above the intersection. The guide sheaves 10, 11, 12 are used to control the position of both ropes 3, 4 in the left and right direction at the wrong intersection.
Since the structure is such that a gap is maintained, that is, rope interference is prevented, the rope interference prevention effect can always be achieved at a fixed position (lower part of the leader holder 2), regardless of fluctuations in the rope crossing position. Therefore,
There is no need to change the position of the leader every time the length changes as in the past, and the attachment can be easily and safely done on the ground before raising the leader.

Further, according to this embodiment, the position of the pendant ropes 3, 3 is regulated in the left and right direction by the guide sheaves 10, 11, 12, this position regulation portion, that is, the movement fulcrum of the ropes 3, 3 as the leader 1 rotates. This is beneficial in terms of rope protection because no excessive force is applied to the rope. In addition, the guide sheave mounting frame 7 can be rotated back and forth, and the sheave block 9 can be rotated back and forth.
Since the whole can be rotated in all directions by the spherical bearing 16, the guide sheaves 10, 11, 12 can be finely followed by various movements of the pendant ropes 3, 3.
3 can be more effectively protected.

However, even if such a rotating structure of the frame 7 and sheave block 9 is not adopted, the intended purpose of the present invention can be fully achieved. Also,
In the present invention, in addition to the above-mentioned sheaves 10, 11, and 12, as a rope guide, for example, two sets of two guide pins are arranged side by side on the left and right on the rope guide mounting frame, and a pendant rope is passed between the two sets of pins on the left and right. Various options can be selected, such as configurations that restrict the position in different directions.

As described above, the rope interference prevention device of the present invention always performs the rope interference prevention function in a fixed position, so it eliminates the trouble of changing the position in response to fluctuations in the rope crossing position due to the leader length, as in the conventional case. The attachment can be easily and safely carried out on the ground before raising the leader.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is an enlarged view of the same part, Fig. 3 is a front view as seen from the base machine side, and Fig. 4 is an enlarged cross section along the line shown in Fig. 3. Figure 5 is an overall side view showing the general configuration of the leader rotary pile driver, Figure 6 is a partially enlarged view showing the rope interference situation, Figure 7 is a front view of the same, and Figure 8 is the conventional pile driver. FIG. 2 is a schematic perspective view of the device. 1... Leader, 2... Leader holder (upper rotating support), 3, 3... Pendant rope, 4,
4... Working lifting wire rope, 7... Guide sheave mounting frame (rope guide mounting frame), 10, 11, 12... Pendant rope guide sheave (rope guide).

Claims (1)

[Scope of utility model registration request] The base machine includes a rotary leader whose upper and lower ends are rotatably supported by upper and lower rotary supports, respectively, in the front part of the base machine, and a rotary leader is provided on the lower outer peripheral surface of the upper rotary support in this leader. In a pile driving machine in which the upper ends of a pair of left and right pendant ropes are fixed, and a wire rope for lifting work equipment such as a pile hammer is stretched across these two pendant ropes, the outer peripheral part of the upper rotating support is A rope guide mounting frame is provided facing downward at the rope guide mounting frame, and the pendant rope is passed through the rope guide mounting frame in such a manner that the pendant rope is regulated in the horizontal direction at a position above the intersection with the wire rope for hoisting the working equipment. 1. A rope interference prevention device for a pile driver, comprising a guide, and configured such that only a portion of the pendant rope above the rope guide moves in the left-right direction as the leader rotates.