JPH073050B2 - Pile driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention inserts a screw auger into the center hole of a concrete pile and rotates the screw auger to push the pile while discharging the excavated soil to the ground. This relates to a pile driver for constructing piles.

(Prior Art) As shown in FIG. 10, a conventional pile driver has a lower traveling body 1,
A leader 4 is supported on the front part of the upper revolving structure 3 of a working machine having a revolving device 2 and an upper revolving structure 3 so that its posture can be controlled by left and right back stays 6 having a cylinder 5, and the lower part of the leader 4 is supported. Attach the guide 8 of the square pile 7,
A holder 10 for a square pile 7 that is moved up and down by a press-fitting device along a guide 9 provided on the leader 4 (the press-fitting device is a hydraulic motor 13 attached to the lower part of the reader 4 and a drive driven by the hydraulic motor 13). The sprocket 14, a driven sprocket 15 attached to the upper end of the leader 4, and a chain 16 wound around both sprockets 14, 15 are connected to the holder 10.) In the upper part, a circular hole c (first hole) penetrating the square pile 7 is provided so as to be vertically movable along the guide 9 and relatively movable to the holder 10.
(See Fig. 11) A drive device 12 for rotating a screw auger 11 inserted therein is attached.

When performing the construction of the square pile 7 using this pile driver, the holder 10 is lowered to the lower part of the reader 4, the square pile 7 is hung in the holder 10 by a crane, and the holder 10 is lifted. The screw auger 11 in the pile 7 is positioned directly below the drive shaft of the drive device 12, and the worker can move the ladder of the leader 4 (not shown).
Climbing along and lowering the drive unit 12 to rotate it by the lower end of the drive shaft connecting flange and screw auger 11
Align with the coupling flange on the upper end of the and connect with bolts or pin. The square pile 7 held by the holder 10 by operating the hydraulic motor 13
While driving the screw auger 11 by driving the screw auger 11 into the ground, the excavated earth and sand is discharged to the ground through the circular hole c in the square pile 7. In this way, for example, as shown in FIG. 11, the square piles 7 are arranged, and concrete milk is injected into the holes b formed by the pair of grooves a provided on the side surfaces of the adjacent square piles 7 to stop the water. To do.

(Problems to be Solved by the Invention) As described above, in the conventional pile driving machine for concrete piles, the drive device 12 of the screw auger 7 is attached to the guide 9 provided in the leader 4 so as to be able to move up and down. The length required for 4 is the length of the square pile 7 plus the height of the drive unit 12 and the vertical width for connecting the drive shaft to the screw auger.
As the leader 4 for constructing the, a long one of 20 m to 30 m was used. Therefore, the pile driver main body for supporting the leader 4 also becomes large in size, and there is a problem that the total weight reaches 80 tons.

In addition, since the pile driver is heavy, when constructing the underframe 18 of the pile driver on the soft ground 17 such as a river as shown in the figure, a large-sized underframe 18 with large rigidity is used. Therefore, there is a problem that the manufacturing cost and the construction cost of the underframe 18 become expensive.

Further, since the work of connecting the screw auger 7 and the drive shaft of the drive device 12 must be performed by climbing to the leader 4, work at a high place is required and there is a problem in that it is dangerous.

In view of the above problems, it is an object of the present invention to provide a pile driver having a structure capable of downsizing a pile driver and an underframe and corresponding to piles of various sizes.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention is to insert a screw auger into a central hole of a rectangular concrete pile, and to discharge excavated sand to the ground by the screw auger. In a pile driving machine for constructing a pile by pushing in, a working vehicle having an upper revolving structure installed on a lower traveling body via a revolving device is provided, and a leader is attached to the upper revolving structure of the working vehicle. A chuck device for gripping a pile is vertically movable along a guide provided on the pile, and the chuck device is vertically moved by a press-fitting device. On the other hand, a screw auger drive device is detachably mounted on the top of the pile. ,
The screw auger drive device includes a lower frame body and an upper frame body, a chuck device that detachably fixes the lower frame body to a pile head, a screw auger rotation drive motor installed in the upper frame body, and The lifting device is provided between the upper frame and the lower frame and relatively vertically approaches and separates both frames, and a drive shaft that transmits the rotational force of the drive motor to the screw auger. At the same time, the drive shaft is configured to project downward from the chuck device attached to the lower frame by the operation of the lifting device, and both chuck devices are rectangular openings through which a pile is inserted in the frame. The chuck cylinders are arranged on the left and right sides of the opening, the chuck band is attached between the expansion and contraction ends of the chuck cylinder, and one side of the pile is brought into contact with the opening edge on the opposite side of the chuck band. Blocks selected from multiple types of different sizes are detachably mounted, and selected from multiple types of different sizes as guides that fit into the grooves on both sides of the pile on the left and right edges of the opening. It is characterized by having a structure in which the above-mentioned guide is detachably attached.

(Operation) In the present invention, the pile is inserted through the opening of the chuck device that is moved up and down along the leader, and the screw auger drive device is fixed to the head of the pile by the chuck device, and the screw auger is attached to the hole of the pile. In the inserted state, the pile and the screw auger are press-fitted while the screw auger is rotated by the drive unit fixed to the head of the pile, and excavation and press-fitting of the pile are performed simultaneously. In the chuck device for raising and lowering along the leader and the chuck device for the head of the pile, according to the size of the square pile, a block to be brought into contact with one surface of the pile, and a guide fitted to the left and right grooves of the pile, By selecting from various sizes and attaching to the edge of the opening, it is possible to carry out the pile driving work by grasping with the chuck device so that the center of the pile is always located at the center of the opening. .

(Embodiment) FIG. 1 is a side view showing an embodiment of a pile driver according to the present invention. A work vehicle in which an upper revolving structure 3 is installed on a lower traveling structure 1 via a revolving device 2 is used as a base machine. And a support frame for the leader 20 at the front of the upper swing body 3 of the work vehicle.
21 is provided, and the leader 20 is attached to the support frame 21 via vertical and horizontal pins 22 and 23 so that the inclination of the left, right, front, and rear can be adjusted, and a hydraulic cylinder is provided between the top of the leader 20 and the rear of the upper swing body 3.
A pair of back stays 25 with 24 are provided, and the posture of the leader 20 can be controlled to be vertical by expanding and contracting the hydraulic cylinder 24.

Reference numeral 26 is a chucking device for gripping the square pile 7, and the chucking device 26 is moved up and down by a press-fitting device along a pair of pipe-shaped guides 32 attached to the reader 20, as in the conventional case. The press-fitting device is a hydraulic motor 27 attached to the bottom of the reader 20.
And a drive sprocket rotated by the hydraulic motor 27
28, a driven sprocket 29 attached to the upper end of the leader 20, and a chain 30 wound around both sprockets 28, 29, and the chain 30 is connected to a frame 31 to which a chuck device 26 is attached. . A holder 33 that holds a guide 32 so as to be vertically movable is attached to the frame body 31.

As shown in FIGS. 2 and 3, the chuck device 26
Is attached to the frame 31 via a rotating device 34. The rotating device 34 includes an inner ring 35 fixed to the frame 31 and the inner ring 35.
An outer ring 37 that is rotatably fitted to a bearing 35 through a bearing 36, a hydraulic swing motor 38 attached to the frame, and the swing motor
38, an output gear 39, an output gear 39, and an intermediate gear 41 attached to the frame 31 so as to mesh with a tooth groove 40 provided on the outer periphery of the outer ring 37.

As shown in FIGS. 2 and 4, the chuck device 26 is
A vertical plate 45 is interposed between the upper and lower circular frame bodies 43, 44 having a square opening 7 for inserting the square pile 7 in the center, and a coupling metal fitting 47 fixed by a bolt 46 is interposed between the upper and lower circular frames. Two hydraulic chuck cylinders 48 are provided on the left and right so that the opening 42 is sandwiched between the frame bodies 43 and 44, and the bottom side of the hydraulic chuck cylinders 48 is connected to the frame bodies 43 and 44 by a pin 49 to attach the pistons. The rod is connected by a pin 51 to a chuck band 50 movably mounted between the frames 43 and 44.

Further, the chuck device 26 is provided with a position adjusting means for the square pile 7 so that the center of the opening 42 and the center of the square pile 7 coincide with each other regardless of the external method of the square pile 7. The position adjusting means are prepared in different sizes corresponding to the external square piles 7 shown in FIG. 4 and the piles 7a and 7b having different (small) exteriors as shown in FIG. , Upper and lower frame body 43,
Between the blocks 44, the receiving blocks 53a, 53b, 53c detachably attached to the block 52 provided on the edge of the opening on the opposite side of the chuck band 50 by the bolts 54, and the square piles 7, 7
Various sizes corresponding to a and 7b are prepared and detachably attached to the edge of the opening 42 on the chuck cylinder 48 attachment side with a bolt 55, and the groove a on the side surface of the square pile 7, 7a, 7c is used.
And guides 56a, 56b, and 56c to be engaged with.

6 and 7 show the square piles 7 (hereinafter, the square piles 7a, 7b
May be included. ) Is a screw auger drive device that is detachably attached to the top part, and the screw auger drive device 60 includes a lower frame body 61 and an upper frame body 62.
A chuck device 63 for removably fixing the lower body 61 to the pile head, two screw auger rotating hydraulic drive motors 64 installed on the upper frame body 62, and the upper frame body 62.
And a lower frame 61, and an elevating device including a vertical posture maintaining guide mechanism 65 and a hydraulic elevating cylinder 68 for vertically approaching and separating the two frame bodies 61 and 62,
It is configured by a drive shaft 69 that transmits the rotational force of the drive motor 64 to the screw auger 7.

The vertical holding guide mechanism 65 is slidably inserted into each of the two short tubular bodies 66 fixed to the upper frame 62 at positions opposite to each other, and the lower end of the vertical holding guide mechanism 65 is set to the lower side. It is composed of a long cylinder 67 fixed to the frame 61.

The drive shaft 69 has a screw blade 70 for pushing up excavated earth and sand, and around the drive shaft 69, an expandable bellows-like cylinder for preventing earth and sand from leaking, in which upper and lower frames are connected to upper and lower frames 62, 61. Body 71
The lower part of the drive shaft 69 is covered with a cylindrical body fixed to the lower frame 61.
It is put in 72, and the earth and sand discharge duct 73 is attached to the cylindrical body 72.

The chuck device 63 is attached to the lower portion of the cylindrical body 72 and has the same structure as the chuck device 26. However, since the chuck device 63 does not require a chucking force for press-fitting the square pile 7, unlike the chuck device 26, one chuck cylinder 74 is provided on each of the left and right sides. As shown in the longitudinal sectional view of FIG. 8, a circular hole 76 through which the drive shaft 69 is inserted is provided in the coupling frame 74 coupled to the frame body 72 by the bolt 75, and the coupling frame 75 and the upper frame 77 integrated with the circular frame 76 are provided. Square openings 80 and 81 through which the square pile 7 is inserted are provided in a lower frame 79 welded to the upper frame 77 by a vertical plate 78. Further, similarly to the above, the chuck band 82 is moved by the chuck cylinder 74, and the block provided at the edge of the opening facing the chuck band 82.
Receiving block that is detachably attached to 83 with bolts 84, and the size corresponding to the size of the square pile 7 is prepared 85
And the square pile 7 is detachably fixed to the upper and lower frames 77 and 79 so as to be engaged with the groove a on the side surface of the square pile 7.
And a guide 87 having a different protrusion width depending on the size of the. Further, in order to prevent the small square pile 7b from coming off from the circular hole 76 and to allow the drive shaft 69 to be inserted, a circular hole 88 having a diameter smaller than the diagonal dimension of the smallest square pile 7b is formed. The plate-shaped stopper 89 has a bolt
It is designed so that it can be detachably attached by 90.

As shown in FIG. 6, in the screw auger drive device 60, the lower end of the drive shaft 69 is inside the tubular body 72 when the elevating cylinder 68 is extended. As shown in the figure, the flange 71 at the lower end of the drive shaft 69 can be made to project below the chuck device 63.

When using this pile driver to construct square piles,
As shown in FIG. (A), the elevating cylinder 68 of the screw auger drive device 60 is contracted so that the flange 71 at the lower end of the drive shaft 69 is projected downward from the chuck device 63 and is laid down on the ground. 90 hoisting ropes 91
Is connected to the screw auger drive device 60 by hanging it on the sheave 92 attached to the square pile 7, and by winding the hoisting rope 91, the flange 71 of the drive shaft 69 is brought close to and aligned with the flange of the upper end of the screw auger 11. Connect with bolts.

After such coupling, by further winding the hoisting rope 91, the screw auger driving device 60 is moved until the coupling frame 75 of the chuck device 63 hits the head of the square pile 7, and then the chuck device 63. The chuck cylinder 74 is contracted to fix the screw auger drive device 60 to the head of the square pile 7. In this case, the guide 87 and the receiving block 85 are sized according to the size of the square pile 7 (or 7a, 7b) in advance.
Is attached to the edges of the openings 80, 81 or the block 83, and the chuck cylinder 74 is contracted in a state where the guide 87 is engaged with the groove a of the chuck square pile 7, whereby the square pile 7 is
Regardless of the size, the axial center of the square pile 7 can be set at the center of the openings 80, 81 of the chuck device 63.

In this way, the hoisting rope 91 is connected to the screw auger drive device 60 fixed to the square pile 7, the square pile 7 is wound up together with the screw auger drive device 60, and is lowered to the lower end of the leader 20 of the work vehicle A. Inside, the guide 56a (or 56b, in the groove a on the side surface of the square pile 7 (or 7a, 7b)
56c) is engaged and inserted, and then the hydraulic motor 27 of the press-fitting device is driven to move the chuck device as shown in FIG. 9 (b).
Raise 26 to the top of reader 20. And chuck device
The chuck cylinder 48 of 26 is contracted to chuck the square pile 7, and the operation of the telescopic cylinder 68 causes the screw auger 11 to move.
With a little protruding from the square pile 7, the drive motor 64 of the drive device 60 is operated to rotate the screw auger 11 in the square pile 7 to push the excavated earth and sand through the circular hole in the square pile 7 and to discharge the discharge duct. While dropping from 73 to the ground, the hydraulic motor 27 of the press-fitting device is operated to press-fit the square pile 7 through the chuck device 26. FIG. 9 (C) shows a state in which the square pile 7 is pressed into the ground to some extent. During the press-fitting operation, the excavation reaction force due to the rotation of the screw auger 11 is applied to the leader 20 via the square pile 7 and the chuck device 26.

Next, the chuck cylinder 48 of the chuck device 26 is extended to unchuck the square pile 7, the chuck device 26 is lifted to the top of the reader 20 by the operation of the hydraulic motor 27, and the square pile 7 is again chucked by the chuck cylinder 48. The square pile 7 is press-fitted while rotating the screw auger 11 in the same manner as described above. As a result, as shown in FIGS. 9 (c) and 9 (d), the chuck device 26 is press-fitted to the bottom of the reader 20. The hoisting rope 91 is slackened so as not to hinder the descending of the screw auger drive device 60.

In some cases, the square pile 7 press-fitted in this manner may be further connected to the square pile 7 by end welding and then press-fitted. In that case, the chuck cylinder 74 of the chuck device 63 is extended to release the chuck of the square pile 7, the bottom chamber and the rod chamber in the lift cylinder 68 are communicated with each other, and the hoisting rope 91 is slightly hoisted to screw up the screw auger 11 and the drive shaft. Exposing the connection with 69 and disconnecting both.

(Effect of the invention) In claim 1, since the pile is used as the excavation reaction force transmitting member, and the pile is press-fitted into the ground while reciprocating the chuck device up and down along the leader, the leader 4 is used. , Shorter than the pile can be used, and it becomes possible to use a short reader of about 7 to 15 m, for example, as opposed to a long reader of 20 m to 30 m which is conventionally required. For this reason,
The pile driver that supports the leader can be small, and the weight of the conventional pile driver is about 80 tons, while it is lightweight, for example, about 30 to 40 tons. Is possible.

In addition, since the weight of the pile driver is small, when constructing an underframe for a pile driver on soft ground and performing work, it is possible to use a lightweight, low-rigidity underframe, which reduces the material cost of the underframe. And the construction cost is low.

Further, it becomes possible to perform the connecting work between the screw auger and the drive shaft of the drive device on the ground, and it is not necessary to climb to the leader as in the conventional case, so that the danger of work is reduced.

Further, since it is possible to attach square piles of various sizes to both of the chuck devices and it is not necessary to prepare a chuck device according to the size of the square piles, the cost of the pile driving machine is reduced, and 1 The types of square piles that can be constructed with a pile driver will be expanded.

According to the present invention, the chuck device attached to the guide of the leader is attached to the guide through the turning device having the pile shaft center as the turning center. Adjustment is easy.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a pile driver according to the present invention,
2 is an enlarged side view showing a chuck device mounted on the leader of the pile driver shown in FIG. 1, FIG. 3 is a vertical sectional view showing a rotating device portion of the chuck device, and FIG. FIG. 5 is a cross-sectional view showing an example chuck device, FIG. 5 is a cross-sectional view showing a state in which square piles of different sizes are mounted in the chuck device, and FIG. 6 is an enlarged view of the screw auger drive device of the embodiment. FIG. 7 is a side view showing the operation of the device shown in FIG. 6, FIG. 8 is a longitudinal sectional view showing a chuck device of the screw auger drive device, and FIG. 9 is a view showing work by the pile driver. Fig. 10 is a process diagram, Fig. 10 is a side view showing a conventional pile driver in a working state, and Fig. 11 is a plan view showing a construction example of a square pile.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Ohara 216-3 Miyanuma, Benten-cho, Soka City, Saitama Prefecture, Tokyo Service Factory, Hitachi Construction Machinery Co., Ltd. (56) References JP-A-60-112925 (JP, A) Actual Development Sho 54-16104 (JP, U) Japanese Patent Sho 49-43002 (JP, B1)

Claims (2)

[Claims] 1. A pile driving machine for constructing a pile by inserting a screw auger into a central hole of a rectangular concrete pile and pushing the pile while discharging excavated soil to the ground with the screw auger. Equipped with a work vehicle in which an upper revolving structure is installed on the body via a revolving device, a leader is attached to the upper revolving structure of the work vehicle, and a chuck device for gripping a pile can be moved up and down along a guide provided on the leader. The screw auger drive device is detachably attached to the top of the pile, and the screw auger drive device includes a lower frame body and an upper frame body. A chuck device for removably fixing the lower frame body to the pile head, a screw auger rotation drive motor installed on the upper frame body, the upper frame body and the lower frame An elevating device that is provided between the frame body and relatively vertically approaches and separates both frame bodies, and a drive shaft that transmits the rotational force of the drive motor to a screw auger. Upon operation, the drive shaft is configured to project downward from the chuck device attached to the lower frame body, and both chuck devices have a square opening through which a pile is inserted in the frame body. The chuck cylinders are arranged on the left and right sides of the section, and the chuck band is mounted between the expansion and contraction ends of the chuck cylinder. A block selected from the above is detachably attached, and guides selected from a plurality of different sizes are fitted to the left and right edges of the opening as guides that fit into the grooves on both sides of the pile. Pile driver, characterized in that the removably attaching structure. 2. The pile driving machine according to claim 1, wherein the chuck device attached to the guide of the leader is attached to the guide through a rotating device having a pile shaft center as a rotation center.