JPH0337000B2 - - Google Patents

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 of a pile driving machine, etc. is constructed by a cross-joint type lower support device 2 and an upper support device 3, which are approximately perpendicular to the main machine side. The reader rotation device 4 on the lower support device 2 side rotates the reader around the reader center axis 1a in any forward or reverse direction. Therefore, the rotary leader 1 is rotatably supported by the support member 5 of the upper support device 3 around the leader center axis 1a. The support member 5 is supported on the machine side by two backstays 6 and 7.
Flexible joints are used for the book backstays 6, 7 at the machine-side joints A, B and at the support member 5-side joints C, D.

In this 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 to D, and since the support member 5 is in a free state with respect to the leader 1, 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 to D. However, conventional rotary leader upper support devices that take such measures is the 12th
As shown in the figure, a vertical support shaft 1 is attached to both left and right ends of a horizontal support shaft 9 rotatably supported by a support member 5 via a bearing 8.
In an upper support device 12 in which the upper ends of each backstay 6, 7 are pivotally connected via pins 0, 11, a spacer 14 located between both backstays 6, 7 is attached to a bracket 13 connected to the horizontal support shaft 9. When both backstays 6 and 7 support the rotating leader 1 in a substantially vertical position in a bilaterally symmetrical attitude, both ends 14a and 14b of the spacer 14 touch the opposing inner surfaces 6a and 7a of both backstays 6 and 7. The backstays 6 and 7 are configured so that neither of them can swing inwardly around the vertical support shafts 10 and 11 from the desired posture.

On the other hand, as shown by H ₁ and H ₂ in FIG. 13, the upper support height for the rotating leader, that is, the support member 5
The height shall be varied depending on the overall length of the rotating leader being supported. In this case, the lengths of the backstays 6 and 7 are changed without changing the positions of the machine-side connecting parts A and B of the backstays 6 and 7, so the inclination angles of these backstays 6 and 7 are shown as θ ₁ and θ ₂ As the height of the support member 5 changes, the included angles between the backstays 6 and 7 when viewed from the axial direction of the vertical support shafts 10 and 11 become θ ₃ and θ. Changes as shown in ₄ . This change in the included angle between the backstays 6 and 7 changes the distance S between the backstay inner surfaces 6a and 7a where the spacer ends 14a and 14b face each other and are close to each other, as shown in FIG.

Therefore, in the conventional rotary leader upper support device 12 as shown in FIG. 12, when the height of the upper support for the rotary leader is changed, the distance between the backstay inner surfaces 6a and 7a where the spacer ends 14a and 14b face each other and are close to each other increases. The length s between the spacer ends 14a and 14b is adjusted according to the change in S by, for example, replacing the intermediate shims 14c and 14d with ones of different thickness, so that the spacer ends 14a and 14b are always in the correct position. Unless the inner surfaces 6a and 7a of both backstays in the initial position are opposed to each other with a small gap in between, the intended purpose cannot be achieved.

(Means for Solving the Problems) The present invention proposes a rotating leader upper support device that can solve the conventional problems as described above, and its features are as follows: A single vertical support shaft parallel to the rotation leader is attached to a support member that rotatably supports the upper part, and
A pair of stay pivoting brackets are pivotally attached to this vertical support shaft so as to be freely rotatable left and right, and the upper ends of a pair of left and right rotating leader support stays are pivotably pivoted to both of these brackets via horizontal support shafts so as to be freely vertically movable. On the other hand,
The support member is provided with a stopper that comes into contact with a part of each bracket to prevent each bracket from rotating from its home position in a direction corresponding to the closing direction of both stays, and the rotation leader The stopper and the portions of both brackets are set so as to be substantially in contact with each other when supported in a substantially vertical position by both stays.

(Function) In the device of the present invention as described above, the leader side ends of the pair of leader support stays are respectively connected to the common longitudinal support shaft via the stay pivot bracket, and each stay is Since it is only movable up and down relative to the bracket, the machine and the support member form a three-bar link connected at each vertex of a triangle with both stays as two sides, and the position of the vertical support shaft is determined. When the rotary leader is supported in a substantially vertical position by both stays, the stopper and the portions of both brackets substantially contact each other, and this contact causes both brackets to move in the closing direction of both stays. Since rotation in the corresponding direction is prevented, the support member (rotating leader) swings left and right around the vertical support axis, which means that each stay is rotated in a substantially vertical position in a symmetrical position. As long as the leader is supported, a portion of each of the brackets comes into contact with the stopper on the supporting member side, thereby determining the upper support position of the rotating leader.

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 rotating leader remains constant,
Even if the height of the rotating leader support member is changed, the included angle between both stays when viewed from the axial direction of the vertical support shaft, that is, the included angle projected onto a plane, does not change, and the vertical support shaft The postures of both pivoted brackets remain unchanged. 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, each stay remains in a substantially vertical position in a symmetrical position. As long as the rotary leader is supported, the supporting member, that is, the rotary leader, is reliably prevented from swinging from side to side around the vertical support shaft.

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

FIG. 1 shows the entire pile driving machine using the device of the present invention, in which a rotary leader 1 connects an auger screw 20, a casing 21, and an auger machine 22 that rotationally drives the auger screw 20 via a guide rail 23, as before. The machine 25 is supported substantially vertically by a conventionally known lower support device 2 and an upper support device 24 of the present invention. 26 is auger machine 22
This is a hanging rope for lifting and lowering equipment, etc.
It is connected to the winding and unwinding device on the 5 side.

The upper support device 24 of the present invention comprises a rotary leader 1
It is provided with a support member 27 that rotatably supports the rotor around its central axis 1a, and a pair of left and right backstays 28, 29 whose lengths are adjustable. The support member 2
As shown in FIGS. 2 and 3, a supporting bracket 30 is installed in the middle of the rotary leader 1 at a support height that corresponds to the entire length of the rotary leader 1. It is rotatably supported via a vertical support shaft 31 fixed concentrically. A cart 34 is attached to the support member 27 and is movable up and down parallel to the rotation leader center axis 1a via a guide rail 32 and a guide roller 33 fitted thereto. A parallel vertical support shaft 35 is fixed. Reference numerals 36 and 37 denote a pair of stay pivot brackets which are pivotally attached to the vertical support shaft 35 in a hinge-like manner so as to be rotatable left and right, and each of which is attached to the back stay 2.
The upper ends of 8 and 29 are pivotally connected by horizontal support shafts 38 and 39. Reference numeral 40 denotes a stopper attached to the cart 34 in parallel with the vertical support shaft 35 on the side opposite to the side where each stay 28, 29 is located, and pivotally connects the stay 28 on the right side. bracket 36
As shown in FIGS. 4 and 5, a contact plate 41 having an abutting surface 41a that comes into contact with the left side of the stopper 40 is connected to the bracket 37, which pivotally connects the left stay 29. As shown in FIGS. 6 and 7, a contact plate 42 is provided with a contact surface 42a that contacts the right side of the stopper 40. The abutment surfaces 41a and 42a of both brackets 36 and 37 are arranged as shown by solid lines in FIGS. It is set so as to substantially abut against the stopper 40. Therefore, in the supported state, both brackets 36 and 37 cannot rotate in the direction corresponding to the closing direction of both stays 28 and 29.

As shown in FIGS. 8 and 9, the lower end connecting portions A and B of both the backstays 28 and 29 are connected to a fixed position on the machine 25 side via a swivel joint as in the conventional art. Therefore, the distance between both joints A and B
L ₁ and the distance L ₂ between both coupling portions A, B and the rotating leader center axis 1a are constant.

As shown in FIG. 2, the cart 34 has an engaged pin 44 that can be engaged with a locking hook 43 provided on the support member 27, and a pair of left and right positioning pins that are also provided on the support member 27. 45, and a positioning plate 46 having a pin hole that fits into the positioning pin 45. When the rotary leader 1 is used, the locking hook 43 is connected to the engaged pin when the positioning plate 46 is fitted to the positioning pin 45. 44, and the carriage 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. (not shown) and the guide rail 3 of the support member 27
After connecting the backstay 2 with the backstay 2, the locking hook 43 is opened by the cylinder unit 47 and detached from the engaged pin 44.
8 and 29, the cart 34 is raised along the rotating leader 1, and the rotating leader 1
can be rotated onto the machine 25. 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 attached to the support member 27.
It is best to attach it directly to the

A contact plate 41 for both the brackets 36, 37,
42, when both backstays 28 and 29 support the rotating leader 1 in a substantially vertical position in a bilaterally symmetrical position as shown in FIGS. 1, 2, 8, and 9. As shown in FIGS. 3 to 7, the respective contact surfaces 41a and 42a contact the corresponding surfaces of the stopper 40 on the truck 34 side, and each bracket 3
The stopper 40 is configured to prevent the backstays 28 and 29, which are pivotally connected to the shafts 6 and 37, from swinging inward around the vertical support shaft 35.

The rotating leader 1, auger screw 20, casing 21, auger machine 22, lifting cable 26, etc. are used in the same way as conventional pile driving machines of this type, but in this state of use. The rotating leader 1 is supported vertically. At this time, the upper ends of the pair of left and right backstays 28, 29 are connected to each other by a common vertical support shaft 35, so the part of the machine between the backstays 28, 29 and their machine side connecting parts A, B is A three-bar link is formed, and the position of the vertical support shaft 35 with respect to the main body 25 is determined. The support member 27 is pivotally connected by this vertical support shaft 35.
The support member 27 is prevented from swinging from side to side around the support member 5 by contact plates 41 and 42 that sandwich the stopper 40 on the side of the support member 27 from the left and right sides. 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.

Furthermore, when the position of the support bracket 30 is changed according to the total length of the rotary leader 1, the height of the support member 27 can be adjusted by adjusting the lengths of the backstays 28 and 29 as shown in FIG. H ₂ to H ₁
, or vice versa, the inclination angle of the backstays 28 and 29 will change from θ ₂ to θ ₁ or vice versa, but since the vertical support shaft 35 is parallel to the rotating leader center axis 1a, As shown in FIG. 8, the angle θx between the backstays 28 and 29 when viewed from the axial direction of the rotary leader 1, that is, the angle θx projected onto the plane, does not change, and therefore the angle θx between the two brackets 3 does not change.
6 and 37 will maintain a fixed posture. In other words, even if the upper support height for the rotating leader 1 is changed, when both the backstays 28 and 29 support the rotating leader 1 in a substantially vertical position in a bilaterally symmetrical position, the height of each bracket 36 and 37 will always be the same. The contact plates 41 and 42 sandwich the stopper 40 on the support member 27 side from both left and right sides, and the vertical support shaft 3
To reliably prevent the support member 27 from swinging from side to side with respect to 5.

When each backstay 28, 29 swings outward relative to the vertical support shaft 35, the contact surfaces 41a, 42a of the contact plates 41, 42 move in a direction away from the corresponding surface of the stopper 40. In other words, each backstay 28, 29 is free to swing outward with respect to the vertical support shaft 35. Therefore, when the rotary leader 1 is released from support and disassembled, each of the backstays 28 and 29 can be separated from the main body 25 side and swung outward. trolley 34 for folding 1
from the support member 27 and attach the backstay 2.
8, 29 (at this time, both 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 carried out safely.

Furthermore, 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 prior art, and the intended purpose can always be achieved reliably. Further, it has the advantage of having a simple structure and being able to be implemented at a very low cost.

[Brief explanation of drawings]

Figure 1 is a side view of the entire pile driver showing its operating condition.
FIG. 2 is a side view showing the upper support device of the present invention, FIG. 3 is a plan view of the same, FIG. 4 is a cross-sectional plan view of essential parts showing only related parts of the right backstay, and FIG. 5 is a side view of the same. FIG. 6 is a cross-sectional plan view of the main parts showing only the related parts of the left back stay, FIG. 7 is a side view of the same, FIG. 8 is a schematic plan view showing the relationship between the rotating leader and the pair of left and right back stays, and FIG. The figure is the same side view, Figure 10 is a schematic perspective view showing the basic structure of the three-point reader support method, Figure 11 is the same plan view,
FIG. 2 is a plan view of essential parts showing the structure of a conventional rotary leader upper support device, and FIG. 13 is an explanatory view of the same operation. 1...Rotating leader, 2...Lower support device,
3, 12, 24... Upper support device, 4... Leader rotation device, 5, 27... Rotating leader support member, 6, 7, 28, 29... Back stay, 9,
38, 39... Horizontal support shaft, 10, 11, 35... Vertical support shaft, 14... Spacer, 22... Auger machine, 25... Machine, 30... Support bracket, 31... Vertical support shaft , 36, 37... Bracket for stay pivot, 40... Stopper, 41, 4
2... Contact plate, 41a, 42a... Contact surface.

Claims (1)

[Claims] 1. Attach one vertical support shaft parallel to the rotary leader to a support member that rotatably supports the upper part of a rotary leader such as a pile driver, and attach a pair of stay pivot brackets to this vertical support shaft so that they can be rotated left and right. The upper ends of a pair of left and right rotary leader support stays are pivotally connected to these brackets so as to be movable up and down via horizontal support shafts, while a part of each bracket is attached to the support member. A stopper is provided that prevents each bracket from rotating from a fixed position in a direction corresponding to a closing direction of both stays by contacting with the stopper, and the rotating leader is supported in a substantially vertical position by both stays. An upper support device for a rotary leader such as a pile driver, wherein the stopper and the portions of both brackets are set so as to be substantially in contact with each other in the state.