JPH06102895B2 - Pile holder for pile insertion device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile holder used when suspending a pile in a pile inserting device.

[0002]

2. Description of the Related Art Generally, as one of the methods for laying a pile on the ground, an auger drill is attached to a drive shaft of an insertion device assembled to a move of a crane, and then a hole is first formed in the ground by the auger drill. In place of the auger drill, a holder for a pile is attached to the drive shaft, the head of the pile is held by the holder, and the pile is suspended through the insertion device, and then the insertion device It is known to insert the pile into the perforation by lowering it against the move.

[0003]

The conventional holding tool A used in the pile laying method described above has a connecting portion B that can be connected to the drive shaft and a pile, as schematically shown in FIG. A cylinder portion C into which a head portion is inserted is used, and a peripheral wall of the cylinder portion B is formed with an inverted L-shaped locking hole D, and the head portion side of the pile E to be held by the holder A is used. On the end face,
By holding a plurality of locking pieces F projecting outward in the radial direction by welding and locking the locking pieces F in the locking holes D, the head of the pile E is held by the holder A. However, in the structure described above, the locking piece F has to be attached to the head of the pile E by welding each time at the work site, and the workability is poor, and the locking hole is also required. Since the locking piece F is simply hooked on D, when the pile E is lifted up in the air via the holder A, the pile E holds the holder A.
There is a possibility that the pile E is hung up with respect to the pile E and the lifting of the pile E becomes unstable, and the lower end side of the pile E hung on the holder A swings.

The present invention was developed in view of the above-mentioned circumstances, and it is an object of the present invention to eliminate the need for separately assembling a locking piece on the head of the pile as in the conventional case, and to stably and stably mount the pile. (EN) Provided is a pile holder in a pile insertion device that can be hung.

[0005]

DISCLOSURE OF THE INVENTION The present invention, however, is a pile inserting device for inserting a pile into a hole drilled in the ground, and is provided with a connecting portion 23 for connecting to a drive shaft of the inserting device. An outer cylinder member 2 into which a head portion can be inserted, and a support member 3 rotatably supported in the outer cylinder member 2 coaxially with the outer cylinder member 2 are provided. An engaging portion 35 that engages to prevent rotation of the support member is provided, and a plurality of holding bodies 4 that extend in the axial direction with respect to the outer tubular member 2 are radially provided on the outer peripheral portion of the support member 3. On the other hand, while being pivotally attached freely, the holding body 4 is moved inward in the radial direction on the inner peripheral surface of the outer tubular member 2 by the relative rotation of the outer tubular member 2 with respect to the support member 3, and the pile is moved. It is characterized in that a cam surface 6 to be clamped on the outer peripheral surface of the head is provided.

[0006]

According to the present invention, the head of the pile 1 is inserted into the outer cylinder member 2, the engaging portion 35 is engaged with the pile 1, and the drive shaft of the insertion device is rotationally driven. Only by doing so, each holding body 4 moves inward in the radial direction via the cam surface 6 and clamps the outer peripheral surface of the head portion of the pile.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The pile holder shown in the figure is used by being mounted on the drive shaft of the insertion device mounted on the move of the crane as described above. Further, the insertion device is provided so as to be able to move up and down with respect to the move, and the drive shaft of the insertion device is driven by a motor, and the holding shaft and an auger drill can be attached to the drive shaft. First, the auger drill is rotated by the insertion device to form a hole in the ground, and then the auger drill is replaced, the holder is attached to the drive shaft, and the head of the pile is held by the holder. Then, by suspending the pile through the insertion device and lowering the insertion device with respect to the move, the piles are sequentially inserted into the perforations.

Therefore, the pile holder according to the present invention basically has an outer cylinder member 2 into which the head of the pile 1 can be inserted and a coaxial shape with respect to the outer cylinder member 2 in the outer cylinder member 2. The support member 3 is rotatably supported on the support member 3 and four holding bodies 4 are pivotally attached to the outer peripheral portion of the support member 3 so as to freely swing.

The outer cylinder member 2 has a cylindrical outer cylinder 21 into which the head of the pile 1 can be inserted, an upper lid 22 that closes an upper end opening of the outer cylinder 21, and a protrusion provided at the center of the upper lid 22. A fitting hole formed of a hexagonal columnar coupling portion 23, a through hole 24 penetrating in the radial direction is formed in the coupling portion 34, and the coupling portion 23 is formed at the shaft end portion of the drive shaft 5 of the insertion device. 51 is fitted into the drive shaft 5, and the pin 54 is inserted into the through hole 24 of the connecting portion 23 from the pin hole 52 formed in the drive shaft 5, so that the connecting portion 23 is connected to the drive shaft 5. There is.

A plurality of window holes 25, which are square in side view, are formed in the outer cylinder 21.

The support member 3 has a cylindrical inner cylinder portion 31 which can be loosely inserted into the outer cylinder 21, an upper wall portion 32 which closes an upper end opening of the inner cylinder portion 31, and an inner cylinder portion 31. And an annular movable plate 34 disposed below the partition wall portion 33 and movably supported only in the up-down direction with respect to the partition wall portion 33. A boss portion 32a is projectingly provided on the upper surface of the upper wall portion 32, and a flange 32b extending in the radial direction is integrally formed on the upper end of the boss portion 32a.
The flange 32b is attached to the upper lid 22 of the outer cylinder member 1.
And a receiving plate 22a assembled on the lower surface of the upper lid 22, and between the outer circumference of a cylindrical boss portion 22b projecting on the lower surface of the upper lid 22 and the inner circumferential surface of the flange 32b. The support member 3 is supported by the bearing 30 so as to be rotatable relative to the outer cylinder member 1 relative to the outer cylinder member 1. The inner cylinder portion 31 is formed on the outer cylinder 21. A window hole 31a that can communicate with the window hole 25 is formed.

As shown in FIG. 6, a plurality of pins 34a protruding above the movable plate 34 are fixed to the movable plate 34, and a coil spring 34b is interposed between the pins 34a and the pins 34a. 34a is inserted into the circular hole 33a formed in the partition wall portion 33, and a retaining flange 34c is integrally formed at the insertion end portion thereof, so that the movable plate 34 can be moved vertically with respect to the partition wall portion 33. Support.

On the lower surface of the movable plate 34, an engaging portion 35 made of a pin is provided so as to project, and the engaging portion 35 is attached to the pile 1.
Through the bolt hole 11 formed on the upper surface of the head of the head, and by engaging the engaging portion 35 with the bolt hole 11,
The rotation of the support member is prevented.

On the other hand, the holding body 4 is composed of a block body 41 extending in the axial direction of the outer cylinder 21 and a clamp piece 42 provided so as to be axially movable with respect to the inside of the lower end portion of the block body 41. Specifically, the block body 42
Through the through hole 31 formed in the inner tubular portion 31 and extending in the axial direction.
In the state of being interposed in b, the middle portion in the length direction of the block body 41 is supported by the outer peripheral portion of the partition wall portion 33 via a hinge 40 so as to be swingable in the radial direction, while the block body 4 is supported.
1. A guide groove 41a is formed on the inner surface of the lower end portion of 1, and the clamp piece 42 is movably inserted into the guide groove 41a, and a spring 42a is provided between the clamp piece 42 and the partition wall portion 33. It is constructed so as to urge the clamp piece 42 upward with respect to the block body 41.

Further, the bottom wall 41b of the guide groove 41a and the bottom wall 41b of the clamp piece 42 and the facing wall 42b facing the bottom wall 41b are inclined surfaces which are inclined inward in the radial direction as they go downward, The block body 4
Along with the downward relative movement with respect to 1, the clamp piece 42
Are displaced inward in the radial direction with respect to the block body 41.

On the other hand, the outer cylinder 21 constituting the outer cylinder member 2
At the portion of the inner peripheral surface of the outer cylinder member facing the lower end side of the block body 41, the hinge 40 is rotated by the relative rotation of the outer tubular member 2 in the forward rotation direction (clockwise in FIG. 2) with respect to the support member 3. At the fulcrum, the lower end side of the holding body 4 is swung inward in the radial direction to clamp the first cam surface 6 on the outer peripheral surface of the head of the pile 1, and the inner peripheral surface of the outer cylinder 21 and At a portion facing the upper end side of the block body 41, the outer cylinder member 2 is rotated in the reverse direction with respect to the support member 3 (see FIG. 2).
By the relative rotation in the counterclockwise direction, the second cam surfaces 7 for swinging the lower end side of the holding body 4 radially outward with the hinge 40 as a fulcrum are respectively formed.

In the pile holder having the above structure, an auger drill is first attached to the drive shaft 5 of the inserting device assembled to the move of the crane, and the inserting device forms a hole in the ground through the auger drill. After that, instead of the auger drill, the connecting portion 23 of the holder is inserted into the fitting hole 51 of the drive shaft 5, and the connecting portion 23 is connected to the drive shaft 5 by the pin 53. The holder rotates the outer cylinder member 2 relative to the support member 3 in the reverse direction (counterclockwise in FIG. 2) in advance, and the lower end side of the holding body 4 via the second cam surface 7. Rock outward in the radial direction.

The head of the pile 1 is inserted into the outer cylinder 21 from the lower end side of the holder, and the engaging portion 35 is fitted into the bolt hole 11 of the pile 1. With the insertion of 1 into the outer cylinder 21, the movable plate 34 moves upward against the spring 34b.

Next, when the drive shaft 5 of the insertion device is angularly rotated to rotate the outer cylinder member 2 in the forward rotation direction (clockwise direction in FIG. 2) by approximately 90 degrees, the support member 3 is engaged with the engagement member. Since it is locked to the pile 1 via the portion 34, the outer cylinder member 2 rotates relative to the support member 2 in the forward rotation direction.

Therefore, the support member 3 of the outer cylinder member 2
The lower end side of the block body 41 forming the holding body 4 is pushed radially inward by the first cam surface 6 with the relative rotation in the normal rotation direction with respect to the hinge body, and the lower end side of the holding body 4 is the hinge. Swing inward in the radial direction with 40 as the fulcrum,
The clamp piece 42 is pressed against the outer peripheral surface of the head of the pile 1, and as a result, the holding body 4 causes the pile 1 to move.
The head of is clamped.

As the pile 1 clamped by the holding body 4 as described above is lifted by the elevating device, the clamp piece 42 together with the pile 1 moves downward with respect to the block body 41 due to the weight of the pile 1. Even if the bottom wall 41b of the guide groove 41a and the bottom wall 41b of the clamp piece 42 and the facing wall 42b facing the bottom wall 41b are inclined surfaces that are inclined inward in the radial direction as they go downward, The clamp piece 42 is the block body 41.
Since the clamp piece 42 wedges in a wedge shape between the pile 1 and the block body 41 by urging inward in the radial direction with respect to the pile body 1, the pile body 1 moves downward with respect to the holding body 4. There is no slippage.

By the way, when the pile 1 is inserted into the perforation, the cement mill filled in the perforation blows out from the head of the pile 1 through the through hole formed in the axial center of the pile 1. The cement mill blown out from the head of 1 is the support member 3
And is discharged to the outside through the windows 31a and 25 formed in the outer cylinder member 2.

Then, the pile 1 which is lifted up as described above.
When the insertion is completed through the elevating device into the perforation of the ground, the drive shaft 5 of the inserting device is reversed to move the outer cylinder member 2 relative to the supporting member 3 by 90 degrees in the reverse direction. When the block body 4 is rotated, as shown in FIG.
The upper end side of 1 is pushed inward in the radial direction by the second cam surface 7, and the lower end side of the holding body 4 swings outward in the radial direction with the hinge 40 as a fulcrum. The clamp of 1 is released immediately.

[0024]

As described above, according to the present invention, in a pile inserting device for inserting a pile into a hole drilled in the ground, a connecting portion 23 for connecting to a drive shaft of the inserting device is provided, and the head of the pile 1 is provided. An outer cylinder member 2 that can be inserted and a support member 3 that is rotatably supported coaxially with the outer cylinder member 2 inside the outer cylinder member 2 are provided, and the support member 3 is engaged with a pile. And an engaging portion 35 for preventing rotation of the supporting member is provided, and a plurality of holding bodies 4 extending in the axial direction with respect to the outer cylindrical member 2 are freely swingable in the radial direction on the outer peripheral portion of the supporting member 3. On the other hand, on the inner peripheral surface of the outer cylinder member 2, the holding member 4 is moved inward in the radial direction by the relative rotation of the outer cylinder member 2 with respect to the support member 3, and the head portion of the pile. By providing the cam surface 6 for clamping on the outer peripheral surface, the locking piece is attached to the head of the pile as in the conventional case. Even without assembling, the head of the pile is inserted into the outer cylinder member 2 as it is, the engaging portion 35 is engaged with the pile 1, and the drive shaft of the insertion device is rotationally driven. Then, the heads of the piles can be immediately clamped by the holding bodies 4 and stably lifted.

Further, according to the present invention, since the pile is clamped by the plurality of holding bodies 4, there is no fear that the holding body 4 will sway inadvertently with respect to the holder when it is hoisted, and only when it is hoisted. The workability of is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a pile holder according to the present invention.

FIG. 2 is a sectional view taken along line SS in FIG.

3 is a sectional view taken along line TT in FIG.

FIG. 4 is a sectional view taken along line UU in FIG.

5 is a cross-sectional view taken along line VV in FIG.

FIG. 6 is an enlarged cross-sectional view of a main part of the pile holder.

FIG. 7 is a cross-sectional view of essential parts showing an operating state of the pile holder.

FIG. 8 is a partially cutaway front view showing an example of a conventional holder and a pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile 2 Outer cylinder member 23 Connection part 3 Support member 35 Engaging part 4 Holding body 6 1st cam surface (cam surface)

Claims (1)

[Claims] 1. A pile inserting device for inserting a pile into a hole drilled in the ground, comprising an outer cylinder member having a connecting portion 23 for connecting to a drive shaft of the inserting device and capable of inserting the head of the pile 1. 2 and a supporting member 3 which is rotatably supported in the outer cylindrical member 2 coaxially with the outer cylindrical member 2, and the supporting member 3 is engaged with a pile to rotate the supporting member. The engaging portion 35 for blocking is provided, and at the outer peripheral portion of the supporting member 3,
A plurality of holding bodies 4 extending in the axial direction with respect to the outer cylinder member 2.
On the inner peripheral surface of the outer cylindrical member 2 by the relative rotation of the outer cylindrical member 2 with respect to the support member 3, while the pivoting member 4 is pivotally mounted in the radial direction. A pile holder in a pile inserting device, which is provided with a cam surface 6 for moving and clamping the head outer peripheral surface of the pile.