JPH0227020A - Pile driver - Google Patents

Abstract

PURPOSE:To shorten the length of a leader by constituting a pile driver with an auger digging mechanism which is engageable with the head portion of a hollow pile entered under pressure and which uses a pile as a digging reaction, and a chuck device which chucks the outer perimeter of the hollow pile and ascends/descends along the leader. CONSTITUTION:A pile driver is basically constituted with an auger drive device 60 which digs the inside of a hollow pile fittable to the head portion of a pile attachably/detachably, and a chuck device 26 which ascends/descends slidably on a guide 32 that is in parallel with a leader 20 provided standingly at the front of a work vehicle, and which grasps the pile 7 to be entered under pressure and enter it under pressure. The auger drive device 60 is fitted attachably/ detachably to the head of the hollow pile 7 to be entered under pressure, and also, has an expanding/contracting cylinder 68 which ascends/descends a screw auger at a fixed range against the pile. Also, the chuck device 26, after it has made the hollow pile 7 which has been, enter under pressure downward, ascends again and starts entering under pressure. As a result, the leader can be made smaller than the pile.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention involves inserting a screw auger into the center hole of concrete 1 to pile making, and rotating the screw auger to discharge excavated earth and sand to the ground while making a pile. This invention relates to a pile driver that constructs piles by pushing.

(Prior art) As shown in FIG. 10, a conventional pile driver has a lower running body 1.
, a leader 4 is supported at the front of the upper revolving body 3 of a working machine having a revolving device 2 and an upper revolving body 3 so that its posture can be controlled by right and left huck stays 6 having cylinders 5. A guide 8 for the square pile 7 is attached to the lower part, and a holder 10 for the square pile 7 is raised and lowered by a press-fitting device along a guide 9 provided on the leader 4 (the press-fitting device is a hydraulic motor attached to the bottom of the leader 4). 13, a driving sprocket 14 rotated by the hydraulic motor 13, and a driven sprocket 15 attached to the upper end of the leader 4.
Chain 1 rotated around both sprockets 14 and 15
6 and is connected to a chain 16 or a halter 10. ), the upper part of the holder IO is provided with a square peg 7 which is inserted into the oval hole C (see Fig. 11) so that it can be moved up and down along the guide 9 and can be moved up and down relative to the holder 10. [Take the drive device 12 that rotates the screw auger 11]
It will be over.

When constructing the square pile 7 using this pile driver, lower the holter 10 to the bottom of the leader 4, suspend the square pile 7 into the horter IO using a crane, and raise the holter 10. The screw auger 11 inside the square pile 7 is located directly under the drive shaft of the drive device 12, and the ladder of the worker operator 4 (
(not shown), lower the drive device 12, align the coupling flange at the lower end of the drive shaft rotated by this with the coupling flange at the two ends of the screw auger 11, and connect them with bolts or pins. Join by attaching. Then, the hydraulic motor 13 is operated to push the square pile 7 held by the holder lO into the ground, and the screw auger 11 is rotated by the drive device 12, and the excavated soil is passed through the circular hole C in the square pile 7. Discharge to the ground. In this way, for example, as shown in FIG. 11, the square piles 7 are arranged and concrete milk is poured into the holes formed by the pair of grooves a provided on the sides of the adjacent square piles 7. I'll try it.

(Problem to be solved by the invention) In such a conventional pile driver for concrete piles, the drive device 12 of the screw auger 7 or the guide 9 provided on the leader 4 is attached to the guide 9 so that the leader can move up and down. 4 is the length of the square pile 7, the length of the drive device 12
For example, as the leader 4 for constructing a 15 m square pile 7, a long one of 20 m to 30 m was used. . For this reason, the main body of the pile driver that supports the leader 4 also becomes large, resulting in a problem in that the total weight reaches 80 tons.

In addition, since the weight of the pile driver is large, when constructing the underframe 18 of the pile driver on soft ground 17 such as a river as shown in the figure, it is necessary to use a large and rigid underframe 18. Therefore, there was a problem in that the manufacturing and construction costs of the underframe 18 were high.

In addition, the work of connecting the screw auger 7 and the drive shaft of the drive device 12 has to be done by climbing on the leader 4, which necessitates work at high places and poses a problem of danger.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention inserts a screw auger into the center hole of a concrete pile, and pushes the pile while discharging excavated soil to the ground with the screw auger. A pile driving machine that constructs piles by driving the vehicle, comprising a working vehicle in which an upper rotating body is installed on a lower traveling body via a rotating device, a leader is attached to the upper rotating body of the working vehicle, and a leader is installed on the leader. A chuck device for gripping the pile is attached to the pile so as to be movable up and down along the guide, and the chuck device is moved up and down by a press-fitting device, and a screw auger drive device is attached to the top of the pile in a detachable manner. The screw auger drive device includes a lower frame body and an upper frame body, a chuck device that removably fixes the lower frame body to a pile cap, a screw auger rotation drive motor installed in the upper frame body, and a drive motor for rotating the screw auger installed in the upper frame body. The device is provided between a frame body and the lower frame body, and is composed of a lifting device that allows both frames to approach and separate vertically relative to each other, and a drive shaft that transmits the rotational force of the drive motor to the screw auger. The driving shaft may be configured to protrude downward from the chuck device attached to the lower frame when the elevating device is operated.

In the present invention, the chuck device attached to the guide of the leader is attached to the guide via a rotation device whose rotation center is the axis of the pile, thereby making it possible to adjust the angle of the pile.

In addition, in the pile driver for driving square piles as described above, the chuck device attached to the guide of the leader and the chuck device attached to the lower frame body are used to control the vertical and horizontal positions of the square piles. By providing a means for adjusting the position of square piles to match the center of the rectangular opening for pile penetration, it is possible to construct square piles of various sizes.

(Embodiment) Fig. 1 is a side view showing an embodiment of a pile driver according to the present invention, in which a working vehicle in which an upper rotating body 3 is installed on a lower traveling body 1 via a rotating device 2 is used as a base machine. A support frame 21 for the leader 20 is provided at the front of the upper revolving body 3 of the work vehicle, and the support frame 21 is provided with vertical and horizontal pins 22.
．． A pair of hack stays 25 with a hydraulic syringe 24 are provided between the top of the leader 20 and the rear part of the upper revolving structure 3 to allow the hydraulic cylinder 24 to extend and contract. The posture of the reader 120 can be controlled to be vertical. Reference numeral 26 denotes a chuck device for gripping the square pile 7, and the chuck device @26 is raised and lowered by a press-fitting device along a pair of pipe-shaped guides 32 attached to the leader 20, as in the conventional case. The press-fitting device includes a hydraulic motor 27 attached to the lower part of the leader 20, a driving sprocket 28 rotated by the hydraulic motor 27, a driven sprocket 29 attached to the upper end of the leader 20, and both sprockets 28.2.
The hook 9 is composed of a rotated chain 30, and the chain 30 is connected to a frame 31 to which a chuck device 26 is attached. A holder 33 is attached to the frame 31 to hold the guide 32 in a vertically movable manner.

As shown in FIGS. 2 and 3, the chuck device 2
6 is attached to the frame 31 via a rotation device 34. The rotation device 34 includes an inner ring 3 fixed to the frame 31.
5, an outer ring 37 rotatably fitted to the inner ring 35 via a bearing 36; It consists of an intermediate gear 41.

As shown in FIGS. 2 and 4, the chuck device 26 has a vertical plate 45 welded between upper and lower circular frames 43 and 44 having a square opening 42 for penetrating the square pile 7 in the center. A coupling fitting 47 fixed with a bolt 46 is interposed between the upper and lower circular frames 43 and 44, and two hydraulic chuck cylinders 48 are installed on the left and right sides, with the opening 42 sandwiched therebetween. Attach the bottom side to the frame 4 with the pin 49.
3.44, and the piston rod is connected by a pin 51 to a chuck hunt 50 movably mounted between frames 43.44.

Furthermore, the chuck device 26 is provided with means for adjusting the position of the square peg 7 so that the center of the opening 42 and the center of the square peg 7 are aligned regardless of the outer shape of the square peg 7. This position adjustment means is prepared in different sizes corresponding to the square pile 7 with an outer diameter shown in FIG. 4, and the stakes 7a and 7b with different (smaller) outer dimensions as shown in FIG. A bolt 54 is attached to a flock 52 provided at the edge of the opening on the opposite side of the chuck hunt 50 between the two lower frame bodies 43 and 44.
The receptacle that is removably attached to the flock 53a,
53b, 53c and various sizes corresponding to the square piles 7.7a, 7b are prepared, and the chuck cylinder 48 of the opening 42 is removably attached to the side edge with a bolt 55, and the square pile 7. The guides 1 are made up of 56a, 56b, and 56c that are engaged with the grooves a on the side surfaces of the guides 7a and 7C.

6 and 7 show square pile 7 (hereinafter square pile 7 is 73.
Sometimes it is expressed by including 7b. ), and the screw auger drive device 60 includes a lower frame 61, an upper frame 62, and a chuck device that detachably fixes the lower frame 61 to the pile cap. 63, and two screw auger rotation hydraulic drive motors 64 installed on the upper frame body 62.
and a vertical position holding guide mechanism 65 provided between the upper frame body 62 and the lower frame body 61 to relatively vertically approach and separate the frame bodies 61 and 62, and a hydraulic lifting cylinder 8. and a drive shaft 69 that transmits the rotational force of the drive element 64 to the screw-o-cuff.

The vertical holding guide mechanism 65 has two short cylindrical bodies 66 fixed at opposite positions of the upper part 62, and is slidably inserted into each cylindrical body 66, and its lower end is connected to the lower frame. 61 and a long cylindrical body 67 fixed thereto.

The drive shaft 69 has a screw blade 70 for pushing excavated sand, and the upper and lower frames 6 are arranged around the drive shaft 69.
2.61" - covered with a telescopic bellows-shaped soil leakage prevention cylinder 71 whose lower end is connected, and the lower part of the drive shaft 69 is
It is placed in a cylindrical body 72 fixed to the F frame 61, and an earth and sand discharge tact 73 is attached to the cylindrical body 72.

The chuck device 63 is attached to the lower part of the cylindrical body 72 and has the same configuration as the chuck device 26. Since the chucking device 63 does not require chucking force to press-fit the square pile 7, unlike the chucking device 26,
The chuck cylinders 74 provided on the left and right sides each have one piece.

As shown in the longitudinal cross-sectional view of FIG. 8, the coupling frame 74 coupled to the frame body 72 by bolts 75 is provided with a circular hole 76 through which the drive shaft 69 is inserted, and an upper frame 77 integral with the coupling frame 75 is provided. ,
A lower frame 79 is welded to the upper frame 77 by a vertical plate 78,
A rectangular opening 80.81 is provided through which the square pile 7 is inserted. Further, in the same manner as described above, a chuck hunt 82 is moved by a chuck cylinder 74, and a flock 83 provided at the edge of the opening opposite to the chuck hand 82 is removably attached with bolts 84, and is sized according to the size of the square pile 7. The prepared supports are removably fixed to the upper and lower frames 77 and 79 with bolts 86 so as to engage the flock 85 and the groove a on the side surface of the square pile 7, and are fixed to the upper and lower frames 77 and 79 according to the size of the square pile 7. The guide 87 is provided with guides 87 having different protrusion widths.

In addition, in order to prevent the small square peg 7b from coming out of the circular hole 76 and to allow the drive shaft 69 to pass through, a circular hole 88 having a diameter smaller than the diagonal dimension of the smallest square peg 7b is provided. A plate-shaped stopper 89 or a bolt 90
It can be attached and detached by [1].

As shown in FIG. 6, this screw auger drive device 60, when the elevating cylinder 68 is extended,
The lower end of the drive shaft 69 is located within the cylinder 72, and when the elevating cylinder 8 is retracted, the flange 71 at the lower end of the drive shaft 69 can be made to protrude downward from the chuck device 63, as shown in FIG.

When constructing square piles using this pile driver, please use the
As shown in Figure (a), a screw auger drive device 60
By contracting the lifting cylinder 68 of the drive shaft 6
The flange 71 at the lower end of the crane 90 protrudes downward from the chuck device 63, and the crane 90 is placed sideways on the ground.
The hoisting rope 91 is hung over a sheet 92 placed several times around the square stake 7 and connected to the screw auger drive device 60. By winding up the hoisting rope 91, the flange 71 of the drive shaft 69 is connected to the upper end of the screw auger 11. The flange of the flange is brought into close contact with the flange of the flange of the flange of the flange of the flange of the flange of

After making such a connection, the hoisting rope 91 is further connected.
By winding up the chuck device 63 on the head of the square pile 7
The screw auger drive device 6 hits the coupling frame 75 of
0 is moved, and then the chuck cylinder 74 of the chuck device 63 is contracted to fix the screw auger drive device 60 to the head of the square pile 7. In this case, a guy of a size corresponding to the size of the square pile 7 (or 7a, 7b))-8
7 and the receiver are installed by attaching the flock 85 to the edge of the opening 80.81 or the flow groove 83, and contracting the chuck cylinder 74 with the guide 87 engaged in the groove a of the chuck square stake 7. , regardless of the size of the square pile 7, the opening 80.81 of the chuck device 63 which is the axis of the square pile 7
It can be set at the center of

A hoisting rope 91 is connected to the screw auger drive device 60 fixed to the square pile 7 in this way, and the chuck device 26 hoists the square pile 7 together with the screw auger drive device 60 and lowers it to the lower end of the leader 20 of the working vehicle A. Insert a guide 56 into the groove a on the side of the square pile 7 (or 7a, 7b).
a (or 56b, 56c) and insert it, and then drive the hydraulic motor 27 of the press-fitting device as shown in Fig. 9(b).
The chuck device 26 is raised to the top of the sorter 20 as shown in FIG. Then, the chuck cylinder 48 of the chuck device 26 is contracted to chuck the square pile 7, and the screw auger 11 is slightly protruded from the square pile 7 by the operation of the telescopic cylinder rod 8, and the drive motor 64 of the drive device 60 is operated. Then, the screw auger 11 is rotated inside the square pile 7, and the excavated soil is pushed up through the circular hole inside the square pile 7, and before it falls to the ground from the discharge tact 73, the hydraulic motor 27 of the press-in device is activated to chuck it. The square pile 7 is press-fitted through the device 26. The state in which the square pile 7 is pressed into the ground to some extent is shown in Figure 9.
Shown in Figure (C). During the press-fitting operation, the digging reaction force due to the rotation of the screw auger 11 is applied to the sorter 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, and the chuck device 26 is moved to the top of the sorter 20 by the operation of the hydraulic motor 27. is chucked and the screw auger 11 is rotated in the same manner as described above, and then the square pile 7 is press-fitted. As a result, FIGS. 9(c) and (d)
), press fit the chuck device 26 or the sorter 20 until it reaches the bottom. Note that the hoisting rope 91 is left slack so as not to interfere with the descent of the screw auger drive device 60.

In some cases, the square pile 7 press-fitted in this manner is further connected by welding the ends of the square pile and then press-fitted. In that case, the chuck cylinder tuff 4 of the chuck device 63 is extended to unzip the square pile 7, the bottom chamber and the lot chamber in the lifting cylinder cylinder 8 are communicated, and the hoisting rope 91 is slightly wound up and driven with the screw auger 11. The connection part with the shaft 69 is exposed and the connection between the two is released.

Although the above description has focused on the case of a pile driver for square piles, the present invention can also be applied to a pile driver for executing round piles.

(Effect of the invention) According to claim 1, the pile is used as an excavation reaction force transmission member, and the pile is press-fitted into the ground without reciprocating the chuck device up and down along the sorter. 4, shorter than the pile has been used, for example, compared to the conventionally required 20m to 30m long pile, for example 7 to 30m long.
It becomes possible to use a short sorter of about 15 m. For this reason, the pile driver itself that supports the sorter can be made smaller, and compared to the total weight of conventional pile drivers, which is about 80 tons, it is lighter, for example, about 30 to 40 tons, making the device cheaper. It is possible to provide.

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

In addition, it is possible to connect the screw auger and the drive shaft of its drive device on the ground, and there is no need to climb up on the sorter as in the past, reducing operational risks.

In claim 2, when the chuck device attached to the guide of the sorter is attached to the guide via a rotation device whose rotation center is the axis of the pile, and then a plurality of piles are press-fitted adjacently, Position can be adjusted easily.

In claim 3, it is possible to attach square piles of various sizes to both chuck devices, and there is no need to adjust the chuck device according to the size of the square pile, thereby reducing the cost of the pile driving machine. In addition, the types of square piles that can be constructed with one pile driver will be expanded.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a pile driver according to the present invention;
Fig. 2 is an enlarged side view of the chuck device attached to the pile driving machine rider of Fig. 1, Fig. 3 is a vertical cross-sectional view showing the rotating device portion of the chuck device, and Fig. 4 is a side view showing the chuck device attached to the pile driving machine rider of Fig. 1. FIG. 5 is a cross-sectional view showing the chuck device of the embodiment, with square piles of different sizes attached, and FIG. 6 is an enlarged view of the screw auger drive device of the embodiment. 7 is a side view illustrating the operation of the device shown in FIG. 6, FIG. 8 is a vertical sectional view showing the chuck device of the screw auger drive device, and FIG. 9 is a side view showing the operation of the pile driver. Fig. 10 is a side view showing a conventional pile driver in a working state, and Fig. 11 is a plan view showing an example of construction of square piles. 63: Chuck device 74: Chuck cylinder 82: Chuck band 87: Guide

Claims (1)

[Scope of Claims] 1. In a pile driver that constructs a pile by inserting a screw auger into the center hole of a concrete pile and pushing the pile while discharging the excavated earth and sand onto the ground with the screw auger, A working vehicle is equipped with an upper rotating body installed on the body via a rotating device, a leader is attached to the upper rotating body of the working vehicle, and a chuck device for gripping a pile can be raised and lowered along a guide provided on the leader. The chuck device is attached to the top of the pile, and the chuck device is raised and lowered by a press-fitting device, and the screw auger drive device is detachably attached to the top of the pile. , a chuck device for removably fixing the lower frame to a pile head, a drive motor for rotating a screw auger installed in the upper frame, and provided between the upper frame and the lower frame, Both frames are relatively vertically close together,
It is composed of an elevating device that separates them, and a drive shaft that transmits the rotational force of the drive motor to the screw auger, and when the elevating device operates, the drive shaft protrudes downward from the chuck device attached to the lower frame. A pile driver characterized by having a configuration in which: 2. The pile driver according to claim 1, wherein the chuck device attached to the guide of the leader is attached to the guide via a rotation device whose rotation center is about the axis of the pile. 3. The pile driver is a square pile driver, and the chuck device attached to the guide of the leader and the chuck device attached to the lower frame are used to control the vertical and horizontal positions of the square pile. 3. The pile driver according to claim 1, further comprising square pile position adjusting means for aligning the center of the pile with the center of the rectangular opening for inserting the pile.