JPS6268997A - Upper supporter for rotary leader for pile driver, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applicable to pile drivers and excavators in which a leader that supports an auger machine etc. so as to be able to rise and fall is rotatably supported around its central axis. The present invention relates to an upper support device for the rotary leader.

(Prior art and its problems) As shown in FIG. 10, a rotary leader 1 such as a pile driver has a cross joint type lower support device 2 and an upper support device 3.
The device is supported almost vertically on the machine side by
The leader rotating device 4 of the two examples of the lower support devices allows the leader to be rotated in any forward or reverse direction around the leader center axis 1a. The rotary leader 1 therefore has an upper support device 3
The reader is rotatably supported by a support member 5 around the reader center axis 1a. The support member 5 is supported on the machine side by two hack stays 6.7, and these two backstays 6.7 have joint parts A and B on the machine side and joint parts C on the support member 5 side. A swivel joint is used for both D.

In such a so-called three-point leader support system, the support member 5 of the upper support device 3 is connected to the machine side by a four-bar link having joints A-D, and moreover, the support member 5 is connected to the leader 1 Since it is free from
As shown in FIG. 11, the upper support position of the support member 5, that is, the rotary leader 1, can change due to the asymmetrical deformation of the four-bar link. In other words, there is a risk that the attitude of the rotary leader 1 may change unexpectedly due to the reaction force acting on the rotary leader 1 during work, leading to an accident in which the leader collapses.

In order to solve the above-mentioned problems, it is sufficient to prevent asymmetrical deformation of the four-bar link having joints A-D, but the conventional rotary leader upper support device that takes such measures As shown in FIG. 12, the upper end of each backstay 6.7 is connected via a vertical support shaft 10.11 to both left and right ends of a horizontal support shaft 9 rotatably supported by a support member 5 via a bearing 8. In the pivoted upper support device 12, both backstays 6.7 are connected to the bracket 13 connected to the horizontal support shaft 9.
When the spacer 14 is held between the two backstays 6.7 and the rotating leader 1 in a substantially vertical position is supported in a bilaterally symmetrical position, both ends 14a and 14b of the spacer 14 are held between the two backstays 6.7. 6.7 is configured to be close to the opposing inner surfaces 6a, 7a of the
．． 7, the vertical support axis 10.11 moves inward from the desired posture.
On the other hand, as shown by HI and H2 in FIG. It must be changed depending on the total length of the In this case, the length of the backstay 6.7 is changed without changing the positions of the machine-side joints A and B of the backstay 6.7, so the inclination angle of these backstays 6.7 is 0.1
and θ2, the included angle between both backstays 6.7 when viewed from the axial direction of the vertical support shaft 10.11 changes according to changes in the height of the support member 5. changes as shown by θko and θ4. Both backstays 6.
The change in the included angle between 7 and 7 is shown in FIG.
Backstay inner surfaces 6a and 7 where 4a and 14b face each other and are close to each other
This results in changing the interval S between a.

Therefore, in the conventional rotary-goo upper support device 12 as shown in FIG. The length S between both ends 14a and 14b of the spacer is changed according to the change in the distance S of
For example, by adjusting the shims 14c and 14d interposed in the middle by replacing them with ones of different thickness, both ends 14a and 14b of the spacer always face the inner surfaces 6a and 7a of both backstays in the desired posture with a small gap in between. If this was not done, the intended purpose could not be achieved.

(Means for Solving the Problems) The present invention proposes a rotating leader upper support device that can solve the above-mentioned conventional problems, and its features are as follows: The support member that rotatably supports the upper part is provided with a pair of stay pivot brackets that can swing left and right about a vertical support axis parallel to the rotary leader, and these brackets are provided with a pair of left and right rotary leader support stays. The upper end is pivotally mounted on a horizontal support shaft so that it can swing vertically.1. The support member is provided with a stopper that abuts a portion of each of the brackets and prevents each stay from swinging inward around the vertical support shaft from a substantially vertical position supporting the rotary leader. It is at the point.

(Function) In the device of the present invention as described above, the leader-side ends of the pair of leader support stays are connected by the common vertical support shaft to form a five-bar link. The position is confirmed. The supporting member (rotating leader) can swing from side to side with respect to this vertical support axis, as long as each stay supports the rotating leader in a substantially vertical position in a symmetrical position. The upper support position of the rotary leader is determined because a portion of the rotary leader is stopped by coming into contact with the stopper on the support member side.

Furthermore, since the vertical support shaft is parallel to the rotary leader axis, the positions of the machine-side joints of the pair of reader support stays are constant, that is, the distance between the machine-side joints of both stays and the machine side joints are constant. As long as the horizontal distance between the side joint and the rotary leader is constant, even if the height of the rotary leader support member is changed, the gap between both stays when viewed from the axial direction of the vertical support shaft will be maintained. No change occurs in the corners. Therefore, even if the height of the rotary leader support member is changed by changing the length of both stays due to a change in the total length of the rotary leader used, the rotary leader in a substantially vertical position with each stay in a symmetrical position A support member around the vertical support shaft as long as it supports the
That is, the rotating leader is reliably prevented from swinging from side to side.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

FIG. 1 shows the entire pile driver using the device of the present invention, in which a rotary leader 1 lifts and lowers an auger screw 20, a casing 21, and an auger machine 22 that rotationally drives the auger screw 20 via a guide rail 23. It is supported approximately perpendicularly to the main body 25 by a conventionally known lower support device 2 and an upper support device 24 of the present invention. 26 is auger machine 22
It is a suspension cable for lifting and lowering objects such as the 25-inch winding rope, and is connected to the winding and unwinding device.

The upper support device 24 of the present invention includes a support member 27 that rotatably supports the rotary leader 1 around its central axis 1a, and a pair of left and right backstays 28, 29 whose lengths are adjustable. As shown in FIGS. 2 and 3, the support member 27 is attached to a support bracket 30 that is interposed at a support height corresponding to the entire length of the rotary leader 1 in the middle of the rotary leader 1. It is rotatably supported via a vertical support shaft 31 fixed concentrically with the axis 1a. A cart 34 is attached to the support member 27 and is movable up and down in parallel to the rotation leader center axis 1a via a guide rail 32 and a guide roller 33 fitted thereto,
A vertical support shaft 35 parallel to the rotary leader center axis 1a is fixed to this cart 34. 36.37 is the vertical support shaft 35
a pair of stay pivot brackets pivotally connected to the backstay 28 and 29 in a hinge-like manner;
Its upper end is pivotally mounted by horizontal support shafts 38 and 39. 40
is a stopper attached to the cart 34 parallel to the vertical support shaft 35 on the opposite side of the vertical support shaft 35 from the side where each stay 28° 29 is located, and is a bracket for pivotally mounting the right stay 28. As shown in FIGS. 4 and 5, a contact portion 41 having a contact surface 41a that contacts the left side of the stopper 40 is connected to the bracket 36, and the bracket 37 that pivotally connects the left stay 29 has a As shown in FIGS. 6 and 7, an abutting plate 42 having an abutting surface 42a abutting on the right side of the stopper 40 is connected thereto.

As shown in FIG. 8 and FIG.
8.29's lower end joints A and B are the same as before, book 8!25
It is connected to a fixed position on the side via a swivel joint. Therefore, the distance MLI between both joints A and B, and to both joints,
The distance L2 between B and the rotation leader center axis 1a is constant.

Note that the truck 34 is supported by a support member 27 as shown in FIG.
A locked pin 44 that can be locked with a locking hook 43 provided on the support member 27, and a positioning plate 46 having a pin hole that fits into a pair of left and right positioning pins 45 also provided on the support member 27. When the rotary leader 1 is used, the locking hook 43 engages with the engaged pin 44 while the positioning plate 46 is fitted onto the positioning pin 45;
A truck 34 is fixed to the support member 27. When folding the rotary leader 1, the rotary leader 1 is rotated 90 degrees in a predetermined direction from the state shown in FIG. After connecting the guide rail 32 of the support member 27 (not shown), the locking hook 43
By opening the cylinder unit 47 and separating it from the secured pin 44, the backstay 28°2
In conjunction with the contraction operation 9, the cart 34 is raised along the rotary leader 1, and the rotary leader 1 can be rotated onto the book a25. If such a folding function of the rotary leader 1 is not required, the cart 34 may be omitted and the vertical support shaft 35 may be used instead.
may be directly fixed to the support member 27.

The contact angle of both brackets 36 and 37 is 41°42,
When both backstays 28 and 29 support the rotating leader 1 in a substantially vertical position in a symmetrical position as shown in FIGS. 1, 2, 8, and 9, as shown in FIG. As shown in FIGS. 7 to 7, each contact surface 41a, 42a is
The stopper 40 contacts the corresponding surface of the stopper 40 on the fourth side and prevents the backstays 28, 29, which are pivotally connected to each bracket 36, 37, from swinging inward around the vertical support shaft 35. It is configured.

Rotating leader 1, auger screenie 20, casing 21, auger machine 22, and lifting hanging cable 2
6 and the like are used in the same manner as conventional pile drivers of this type, but in this state of use, the rotary leader 1 is supported vertically. At this time, the pair of left and right backstays 28
．． Since the upper ends of 29 are connected to each other by a common vertical support shaft 35, both backstays 28 and 29 and the main machine part between the main machine side connecting parts A and B form a Miura link. The position of the vertical support shaft 35 with respect to the machine 25 is determined. The support member 27 is pivotally connected by this vertical support shaft 35, and the support member 27 swings from side to side around this vertical support shaft 35 by sandwiching the stopper 40 on the side of this support member 27 from left and right. It is blocked by the contact plates 41, 42 that are present. In other words, the vertical support shaft 35 and the support member 27
The position of the rotary leader 1 supported by this support member 27 is determined.

Also, depending on the total length of the rotating leader 1, a supporting bracket 3 is installed.
0 is changed, that is, the height of the support member 27 is changed from H2 to H9 or vice versa by adjusting the length of the backstay 28, 29 as shown in Fig. 9. Of course, the inclination angle of the backstays 28 and 29 changes from θ2 to θ1, or vice versa, but since the vertical support shaft 35 is parallel to the rotation leader center axis 1a, the rotation leader 1 as shown in FIG. The projected included angle θ8 between both backstays 28 and 29 when viewed from the axial direction does not change.

In other words, even if the upper support height for the rotary leader 1 is changed, when both backstays 28 and 29 support the rotary leader 1 in a substantially vertical position in a bilaterally symmetrical position, each bracket 36, 37 is always supported. Hit plate 41.42
The stopper 40 on the support member 27 side is sandwiched from both left and right sides, and the support member 27 is reliably prevented from swinging from side to side with respect to the vertical support shaft 35.

When each of the 7x stays 28.29 swings outward with respect to the vertical support shaft 35, the contact surface 41a of the contact plate 41.42
, 42a move in a direction away from the corresponding surface of the stopper 40. In other words, each backstay 28 , 29 is free to swing outwards relative to the longitudinal support shaft 35 . Therefore, when the rotary leader 1 is released from support and disassembled, each backstay 28, 29 can be separated from the main a25 side and swung outward. In order to fold the carriage 34, the backstays 28, 29 can be retracted by separating the truck 34 from the support member 27 (at this time, both the backstays 28, 29 open symmetrically about the vertical support shaft 35).

(Effects of the Invention) As described above, according to the rotary leader upper support device of a pile driver or the like of the present invention, as long as the rotary leader is supported substantially vertically, the support position of the rotary leader is adjusted to accommodate the reaction force during work. There is no fear of unexpected fluctuations due to this, and the intended work can be performed safely.

Moreover, even if the upper support height is changed due to a change in the overall length of the rotary leader used, there is no need for any special adjustment as in the conventional case, and the intended purpose can always be achieved reliably.

It also has the advantage of being simple in structure and can be implemented at very low cost.

[Brief explanation of drawings]

Figure 1 is a side view of the entire pile driver in use, Figure 2 is a side view of the upper support device of the present invention, Figure 3 is a plan view of the same, and Figure 4 is only related parts of the right backstay. Fig. 5 is a side view of the main part, Fig. 6 is a transverse plan view of the main part showing only related parts of the left back stay, Fig. 7 is a side view of the same, and Fig. 8 is a rotational view. A schematic plan view showing the relationship between the leader and a pair of left and right banok stays, FIG. 9 is a side view of the same,
FIG. 10 is a schematic perspective view showing the basic structure of the three-point reader support method, FIG. 11 is a plan view of the same, and FIG.
Figure 3 is an explanatory diagram of the same action. 1...Rotating leader, 2...Lower support device, 3,1
2.24... Upper support device, 4... Leader rotating device, 5.27... Rotating leader support member, 6. 7.
28.29...bank stay, 9.38.39...
・Horizontal support shaft, 10. IL 35... Vertical support shaft, 14...
Spacer, 22...Auger machine, 25...
This machine, 30... Support bracket, 31... Vertical support shaft, 36, 37... Bracket for stay support, 40.
・・Store/Par, 4L 42 ・・Tachimutan, 4
1a, 42a... contact surface. Figure 1 Figure 4 Figure 5

Claims (1)

[Claims] A support member that rotatably supports the upper part of a rotary leader such as a pile driver is provided with a pair of stay pivot brackets that can swing left and right around a vertical support shaft parallel to the rotary leader. The upper ends of a pair of rotary leader supporting stays are pivoted to be vertically swingable by a horizontal support shaft, and each of the stays moves inwardly around the vertical support shaft from a substantially vertical position supporting the rotary leader. An upper support device for a rotary leader such as a pile driver, wherein the support member is provided with a stopper that comes into contact with a portion of each bracket to prevent it from swinging.