JPH0629518B2 - Jet pipe mounting device for pile driving - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is for pile driving for detachably fixing a jet pipe for ejecting water or the like near the tip of the pile in order to reduce the press-fitting resistance of the pile. The present invention relates to a jet pipe mounting device.

(Prior art) When press-fitting a pile into a relatively hard ground, in order to reduce excavation resistance and facilitate press-fitting, a jet pipe is attached to the pile and a press-in water is ejected from a nozzle near its tip. The stake may be pressed in while being pushed.

For example, when a pile is press-fitted by using both a press-fitting machine and a water jet, as shown in FIG. 13, a jet pipe 52 having a jet nozzle 51 at its tip is attached and fixed along the entire length of the pile 53 in advance.

That is, the jet pipe 52 is fixed to the pile 53 by welding or banding at a predetermined interval by the pipe band 61, and the upper end portion of the pile 53 is welded or bolted to the jet pipe 52 with the grip plate 62 welded to the jet pipe 52. Has been done.

At the time of press-fitting the pile, the pile 53 is grasped by the chuck 57 of the press-fitting machine 54, and while the pressurized water is supplied from the hose 58 connected to the upper end of the jet pipe 52, the chuck 57 is lowered along the leader 60 to move the pile 53. Press fit.

Since the jet pipe 52 needs to be pulled out when the press-fitting of the pile is completed, after the grip plate 62 is grasped by the chuck 57 and the edge is cut off, the wire 64 at the upper end of the jet pipe 52 is hooked on the hook 64 of the crane to be pulled out. .

(Problems to be solved by the invention) When press-fitting a pile by using a water jet, it is desirable to adjust the water pressure and the spread of the jet according to the hardness change of the stratum. This is possible by changing the distance between the tip and the nozzle.

However, the nozzle position cannot be adjusted by the conventional method in which the jet pipe is attached and fixed along the entire length of the pile in advance, so if the stratum changes during press-fitting of the pile and the position of the nozzle needs to be adjusted. You have to pull out the stake and reinstall the jet pipe.

In addition, after the press-fitting of the piles is completed, the work of pulling out the jet pipe by a crane, etc. by grasping the grip plate of the jet pipe with a chuck and then cutting it out is troublesome, and the jet nozzle and jet pipe are cut and reused. I couldn't.

The present invention has been made in view of the above points, and it is easy to attach and detach the jet pipe to and from the pile press-fitting machine, and it is possible to easily adjust the position of the nozzle in response to changes in the stratum during press-fitting of the pile. It is an object of the present invention to provide a jet pipe mounting device for driving a pile, which does not require a crane or the like for pulling out and can reuse a jetcho pipe or the like.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms a chuck portion including a movable pawl and a fixed pawl for clamping a pile in a chuck device of a pile press-fitting machine, and fixes the fixed portion. It is characterized in that a jet pipe holding mechanism for holding the jet pipe is formed in the claw.

(Operation) While holding the pile to be press-fitted by the pile-holding chuck of the pile press-fitting machine and holding the jet pipe with the jet-pipe holding chuck, jetting water from the nozzle to reduce the excavation resistance, the pile is press-fitted.

During this press-fitting, the distance between the tip of the pile and the tip of the nozzle is adjusted according to the hardness of the formation, but this adjustment is performed by holding the pile holding chuck or jet pipe holding chuck while the pile is being pressed into the ground. By releasing, the relative position between the pile and the nozzle can be changed. The jet pipe can be easily pulled out after the pile is press-fitted by opening the jet pipe holding chuck.

(Example) Next, the Example of this invention is described in detail with reference to an accompanying drawing.

1 to 3 are views showing a first embodiment of a jet pipe mounting device for pile driving according to the present invention. In the figure, reference numeral 1 is a chuck device, and the chuck device 1 is attached so as to be movable in the vertical direction along with a leader of a pile press-fitting machine (not shown).

The chuck device 1 is formed with an opening 5 through which a pile 2 and a jet pipe 4 having a nozzle 3 at its tip are inserted.
A pile holding chuck 6 and a jet pipe holding chuck 7 are provided on the chuck portions 1a and 1b on both sides of the opening 5.

The cylinder 8 of the pile holding chuck 6 is fixed to the chuck portion 1a of the chuck device 1, and the movable pawl 10 is attached to the cylinder 8.
The fixed claw 11 attached to the movable claw 10 is formed integrally with the chuck portion 1b.

An opening 12 is formed behind the fixed claw 11. The jet pipe 4 is inserted into the opening 12 and the cylinder 13 of the jet pipe holding chuck 7 is inserted.
Is fixed and the movable claw 15 is attached to the cylinder 13 via a slidable rod, and a pipe receiving portion 16 facing the movable claw 15 is formed on the back side of the fixed claw 11.

Thus, the pile holding chuck 6 and the jet pipe holding chuck 7 are arranged in parallel in the press-fitting direction of the pile 2 and the jet pipe 4, and the pile 2 and the jet pipe 4 can be held separately.

A winch 17 for pulling out the jet pipe is attached to the upper part of the chuck device 1. A wire 19 from a drum 18 of the winch 17 is connected to a hook 21 at the tip of the jet pipe 4 via a roller 20. There is.

Next, the operation of this embodiment will be described.

First, the chuck device 1 is moved to the uppermost part of the leader of a press-fitting machine (not shown), the pile 2 is inserted into the opening 5 of the chuck device 1, and the jet pipe 4 is inserted into the opening 12 of the chuck part 1b.
, The wire 19 from the drum 18 is connected to the hook 21 at the tip of the jet pipe 4, the position of the nozzle 3 of the jet pipe 4 is adjusted, and the pile holding chuck 6 and the jet pipe holding chuck 7 separately Hold in.

Pressure water is supplied from the upper end of the jet pipe 4, and the nozzle 3
Then, the chuck device 1 is lowered while jetting jet water from the above to start press-fitting the piles 2.

After this, the jet pipe 4 depending on the hardness of the stratum during press-fitting of the pile
Is vertically moved to optimally adjust the distance between the tip of the pile 2 and the nozzle 3, and this operation is performed as follows.

For example, when moving the pile 2 around the nozzle 3, the pile holding chuck 6 is opened and moved up and down while the jet pipe holding chuck 7 holds the jet pipe 4, and conversely, the nozzle 3 is held against the pile 2. When moving, the jet pipe holding chuck 7 is opened and moved up and down while holding the pile 2 with the pile holding chuck 6, and the distance between the tip of the pile 2 and the tip of the nozzle 3 is adjusted. The movement of the jet pipe 4 is performed by the operation of the winch 17.

When the pile 2 and the jet pipe 4 are press-fitted by one stroke of the chuck device 1 while performing such an operation, the pile holding chuck 6 and the jet pipe holding chuck 7 are opened,
The chuck device 1 is moved to the uppermost part of the leader, and the above operation is repeated again, and the pile 2 is press-fitted to a predetermined depth.

When the press-fitting is completed, the jet pipe holding chuck 7 is opened, the winch 17 is rotated, and the jet pipe 4 is pulled out from the ground. After this, the pile holding chuck 6 is opened and the press-fitting machine is removed from the pile 2.

In addition, during the press-fitting of the pile 2, it is necessary to use the jet together only in a part of the press-fitted stratum, and even if it is not necessary to use the jet together after penetrating the formation, the same method as above is used during the press-fitting of the pile 2. It is possible to pull out the jet pipe, which improves work efficiency.

In the fourth embodiment shown in FIGS. 10 to 12, the winch 17 for pulling out the pipe in the first embodiment,
The wire 19 and the like are not provided. In this case, the upper end of the pipe 4 can be hung and pulled up by another device, so that the same effect as that of the first embodiment can be obtained. Further, in this embodiment, the device can be easily manufactured.

4 to 6 are views showing a second embodiment of the present invention. In this embodiment, the jet pipe mounting device is of a roller type, and the chuck device 1 is the same as in the first embodiment.
The receiving portion 16 is formed on the back side of the fixed claw 11 of
The jet pipe holding roller 22 is arranged so as to face the. The jet pipe holding roller 22 includes gears 23 and 24.
It is connected to the hydraulic motor 25 or the like via.

Therefore, the jet pipe 4 is mounted and supported between the receiving portion 16 and the jet pipe holding roller 22. Then, when the motor 25 is rotated, the jet pipe 4 is being press-fitted into the pile.
Moves up and down, which allows position adjustment. Further, the jet pipe 4 can be pulled out after the press-fitting of the piles is completed by rotating the jet pipe holding roller 22 by the motor 25.

7 to 9 are views showing a third embodiment of the present invention. In this embodiment, the jet pipe holding roller 22 in the second embodiment is a pinion type jet pipe holding gear 26, and a rack 27 is formed at the opposite portion of the jet pipe holding gear 26 over the entire length of the pipe. The jet pipe 28 is attached.

The operation of this embodiment is the same as that of the second embodiment described above, but the vertical position adjustment of the jet pipe with rack 28 during the press-fitting of the pile is ensured by the action of the rack and the pinion.

Although the winch 17 for pulling out the jet pipe is provided in the first embodiment, the winch 17 is not always necessary in the second and third embodiments. The withdrawal of the jet pipe 4 in this case is the reverse of the case of press fitting. That is, while holding the jet pipe 4 by the jet pipe holding chuck 7, the chuck device 1 is lifted to the uppermost part of the leader, and the pipe holding chuck 7 is opened to move the chuck device 1 downward. By repeating this procedure, the jet pipe 4 can be pulled out without the winch 17.

(Effects of the Invention) As described above, according to the present invention, since the jet pipe holding mechanism is formed on one fixed hook of the chuck portion composed of the movable hook and the fixed hook, it is not necessary to separately provide a holding mechanism.
Since the pile and the jet pipe are sandwiched separately without being joined by the simple chuck structure, it is possible to adjust the nozzle position according to the change of the stratum during the press-fitting of the pile by moving the jet pipe or the pile up and down. Become. Furthermore, the pile driving work can be performed reliably and quickly, and the work safety is improved.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of a first embodiment of a jet pipe mounting device for pile driving according to the present invention.
2 is a side view showing a supporting state of the jet pipe of FIG. 1, FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG.
FIG. 5 is a plan view of an embodiment, FIG. 5 is a side view showing a supported state of the jet pipe of FIG. 4, FIG. 6 is a sectional view taken along line VI-VI of FIG. 4, and FIG. 7 is a plan view of a third embodiment. FIG. 8 is a side view showing the support state of the jet pipe of FIG. 7, FIG. 9 is a sectional view taken along line IX-IX of FIG. 7, FIG. 10 is a plan view of the fourth embodiment, and FIG. FIG. 10 is a side view showing a supported state of the jet pipe of FIG. 10, FIG. 12 is a sectional view taken along line XX of FIG.
The figure is an explanatory view showing a conventional method of attaching a jet pipe. 1 ... Chuck device, 2 ... Pile, 3 ... Nozzle 4 ... Jet pipe, 6 ... Pile holding chuck 7 ... Pipe holding chuck

Claims (1)

[Claims] 1. A chuck unit of a pile press-fitting machine is provided with a chuck portion composed of a movable claw for clamping a pile and a fixed claw, and a jet pipe clamping mechanism for clamping a jet pipe is formed in the fixed claw. Jet pipe mounting device for pile driving.