JPS61221416A - Pile's mid-portion holding type vibrohammer - Google Patents

Abstract

PURPOSE:To easily drive a pile by a method in which a vibrator is attached to a base which can vertically move along a leader and can also be inserted with a pile and a pile-holding chuck mechanisms are provided to the base and a holder vertically moving in the pile. CONSTITUTION:When a motor 24 is turned to operate a vibrator 13 and a tubular pile 11 begins to be driven into the ground, a vibrohammer is also lowered gradually. When the hammer 10 comes to a place near a supporting seat 4, the operation of the vibrator 13 is stopped to discontinue the driving operation. Oil-pressure cylinders 29 and 31 are operated, the inside and outside claws 16 and 15 of a chuck mechanism 17 are each separated from inner and outer faces 11a and 11b, and a base 12 and a holder 14 are raised by a wire 22 to restore the hammer 10 to the initial starting position for driving. The pile 11 is held by the mechanism 17 and the vibrator 13 is operated for restarting the driving operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibro hammer capable of driving a pile, particularly a tubular pile, into the ground while holding the middle portion of the pile.

(Prior Art) A vibrohammer is a pile driving machine that is widely used when driving piles into the ground etc. because of its relatively low noise and various other advantages.

Driving regular piles using this vibrohammer
This will be explained by taking as an example the case of submarine ground as shown in the figure. - A turret 2 is installed on board the pile driving boat 1, and the turret 2 is provided with a leader 3 and a support seat 4. A wire 5 is suspended from the top of the tower 2, and a vibro hammer 6 is attached to the tip of the wire 5. That is, the pie grommets 6 protrude from the leader 5 and are movable up and down.

When driving pile 7 (steel pipe pile) into the ground, t
A span plate 8 is welded to the inner periphery of the upper end of the pile 7. Next, the span plate 8 is gripped by the claws 9 of the pipe hammer 6, and the vibro hammer 6 is pulled upward with the stake 7 inserted through the support seat 4.

Thereafter, the vibro hammer 6 is operated to apply vibration to the pile 7, and the pile 7 is driven into the ground as shown in Figure 1.

(Problems to be Solved by the Invention) As mentioned above, all conventional Bigronometers grasp the vicinity of the upper end of the pile to be driven and apply vibrations from above the pile to drive it into the ground. It is a typing type.

However, in the above case 2, if the length of the stake 7 is smaller than the height of the turret 2, there is no problem.

If the height is greater than the height of the turret 2, you must proceed as follows.

In other words, the stake 7 has a length that can be driven at the height of the turret 2.
is driven into the ground as shown in FIG. 4, and when the upper end of the pile 7 descends to the vicinity of the support seat 4, the grip of the claw 9 is released and the vibro hammer 6 is pulled upward.

Then, another pile is added to the upper end of the pile 7 by welding,
After that, the top end of this added pile must be grasped with the claw 9 and driven in again with the vibro hammer 6. If the length to be driven in is very long, such driving, welding, driving, etc. ... must be repeated several times.

Therefore, driving of the vibro hammer 6 must be interrupted while welding another pile, and
Even after welding, careful non-destructive inspection of the welded area must be carried out.

Furthermore, welding this other pile has to be done with the pile erected and in a place with poor footing, making it an extremely difficult task. As a result, driving long piles using conventional vibrohammers requires a great deal of labor and time.

The present invention aims to provide a vibrohammer that solves these problems.

(Means for Solving the Problems) The present invention, as a means for solving the above-mentioned problems, includes: a base that moves up and down along a leader and into which a tubular pile to be driven can be inserted; Equipped with a vibrator and a holder that moves up and down inside the tubular pile.

Moreover, the plurality of outer claw members attached to the base and protruding toward the outer circumferential surface of the tubular pile and the plurality of inner claw members attached to the holder and protruding toward the inner circumferential surface of the tubular pile cooperate with each other. The structure includes a chuck mechanism that holds the tubular pile by the action of the chuck mechanism.

(Function) When driving a long tubular pile using the vibrohammer according to the present invention, it is performed as follows.

First, a holder is placed inside the tubular pile, the inner claw member attached to the holder is made to protrude from the inner peripheral surface of the tubular pile, and the holder is fixed at a certain position inside the tubular pile. is inserted into the base, and the outer claw member attached to the base is made to protrude toward the outer peripheral surface corresponding to the position of the inner claw member. That is, the tubular pile is held by the cooperation of the inner claw member and the outer claw member.

Then, in this state, the exciter is activated to drive the pile. Then, when the vibrohammer descends and reaches near the water surface (or near the ground surface), the operation of the exciter is stopped, and the holding of the tubular pile by the inner claw member and the outer claw member is released.

Next, the base and holder are raised to the initial driving start position. Thereafter, driving is completed by repeating the holding of the tubular pile by the inner claw member and the outer claw member, the activation of the exciter, etc.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

The reason for this is that the tubular pile 11 is attached to the vibro hammer 10 of this embodiment.
This shows the installed state.

The vibro hammer 10 can be moved up and down on the leader 3 of the tower 2.

The structure of the vibro hammer 10 will be explained in detail based on FIGS. 1 and 2. The vibro hammer 10 generally has a base 1.
2. Exciter 13. holder 14, and a plurality of outer claw portions 1f415 attached to Iζ base 12jζ;
It has a chuck mechanism 17 composed of a plurality of inner claw members 16 attached to the holder 14.

As shown in FIG. 2, the base 12 has a substantially U-shaped shape into which the tubular pile 11 can be inserted, and a guide portion 18 that slides on the leader 3 is provided on the back side, and a buffer is provided on the side surface. Spring 1
A support tube 20 with a tube 9 installed therein is fixed. The upper end of the buffer spring 19 is attached to a wire 22 suspended from the tower 2 via a shackle 21. A door 23 that can be opened and closed in the direction of the arrow in FIG. 2 is attached to the front part.

Two exciters 13 each having an eccentric weight rotation motor 24 are fixedly installed on the upper surface of the base 12 . The eccentric weights used in these two exciters 131ζ are connected to a connecting shaft 25 and a gear.

Synchronous transmission shaft device 26 using universal gear 1 India etc.
The rotations of each are forced to be synchronized. This is to prevent vibrations caused by the rotation of the eccentric weights from canceling each other out if the respective rotations are not synchronized.

A holder 14 is disposed inside the tubular pile 11 that is inserted through the base 12 and is suspended by a wire 27 so as to be movable up and down.

Four hydraulic cylinders 29 connected to hydraulic piping 28 are arranged in the holder 14 at equal intervals in the radial direction of the tubular pile 11. The above-mentioned inner claw member 16, which is reciprocated by the hydraulic cylinder 29, is attached to each hydraulic cylinder 29. As shown in the figure, a sharp blade is formed at the tip of the inner claw member 16, so that the force when engaging with the inner circumferential surface 11a of the tubular pile 11 is increased.

On the other hand, four hydraulic cylinders 31 communicating with hydraulic piping 30 are arranged on the base 12 side so as to correspond to the hydraulic cylinders 29 . That is, as shown in FIG. 2, three of the four hydraulic cylinders 51 are attached to the base 12 and one is attached to the door 23. An outer pawl member 15 is attached to each hydraulic cylinder 31 so as to reciprocate with respect to the outer circumferential surface 11b of the tubular pile 11.

The outer claw member 15 and the inner claw member 16 constitute the chuck mechanism 17 of the vibro hammer 10, and the outer claw member 15 and the inner claw member 16 are each detachable from the hydraulic cylinder 31°29. 2. The stroke of the hydraulic cylinders 31 and 29 can be adjusted.

By making it removable and adjustable as described above, the present vibrohammer can be used freely even if the cross-sectional shape of the tubular pile 11 or its outer diameter and inner diameter are various. . In addition, since it is removable, it is possible to increase or decrease the contact area with the stake 11 on the claw side, and the stake 11 can be made smaller or larger.
Easily apply surface pressure per unit area! ! 14 can be adjusted. Of course, in this vibro hammer, this surface pressure can also be adjusted by changing the oil pressure.

Next, a case will be described in which a tubular pile 11 is driven using the vibro hammer 10 configured as described above.

The tubular pile 11 has been previously joined on board the pile driving ship 1 or at another location by welding at the point B shown in the third factor, and is made to have a long dimension larger than the height of the turret 2. . Welding at this time can be performed with the tubular pile 1j lying on its side, so it can be performed easily and quickly, and non-destructive inspection after welding is also easy.

First, the holder 14 is inserted into a predetermined position inside the tubular pile 11 with the tubular pile 11 lying on its side. Next, the hydraulic cylinder 29 is operated to cause the inner claw member 16 to protrude to the inner circumferential surface 11a, thereby fixing the Iζ holder 14 at the predetermined position.

After the holder 14 is fixed, the tip of the tubular pile 11 is lifted up by a crane (not shown in FIG. 1ζ). This crane is equipped with a hoist for raising and lowering the wire 27.

Then, M123 of the base 12 is left open, the tubular pile 11 is placed inside the base 12, and then the door 25 is closed. Next, by raising and lowering the wire 22, the base 1
2 is positioned at the height where the holder 14 is fixed. Then, the hydraulic cylinder 51 is operated to cause the outer claw member 15 to protrude from the outer peripheral surface 11b, and the base 12 is fixed to the tubular pile 11.

At this time, in the portion of the outer circumferential surface 11b that is in contact with the outer claw member 15, the inner claw member 16 is in contact with the inner side of this portion with a constant pressure as shown in FIG. Therefore, even if the wall thickness of the tubular pile 11 is relatively thin, the contact (or suppression) of the outer claw member 15 will not cause deformation such as denting in this portion.

After the base 12 is fixed to the tubular pile 11 in this manner, the motor 24 is rotated and the exciter 13 is activated. Then, driving of the tubular pile 11 into the ground is started by the vibration of the exciter 1S, and at the same time, the vibro hammer 10 also gradually descends.

Then, when the vibrohammer 10 reaches its lowering limit near the support seat 4, the operation of the exciter 13 is stopped,
Temporarily suspend typing.

Next, the holding of the tubular pile 11 by the chuck mechanism 17 is released. That is, the hydraulic cylinders 29 and 31 are operated to separate the inner claw member 16 and the outer claw member 15 from the inner circumferential surface 11a and the outer circumferential surface 11b, respectively. After that, the base 12 and the holder 14 are raised by the wire 22 and the wire 22 . In other words, the entire Vibro/1 mm 10 is returned to its original driving start position.

After the tubular pile 11 is held again by the chuck mechanism 17, the exciter 13 is activated to restart driving. By repeating such operations, the tubular pile 11 can be easily and quickly driven into the ground to a desired depth, and the driving process is completed.

In the above embodiment, the exciter 15 is connected to the base 12.
Although an example is shown in which the vibration exciter is attached only to the holder 14, in the present invention, a similar exciter or a slightly smaller exciter may be attached to the upper surface of the holder 14. Of course, in this case, the suspension of the holder 14 by the wire 27 is 19,20
This will be done using the same buffer spring and support tube.

When the exciter attached to the holder 14 is operated, the exciter 13 attached to the base 12 is not operated. In other words, the tubular pile 11 is driven only by the exciter attached to the holder 14. This is holder 1
This is to prevent the vibrations of the vibrator 15 on the 4 side and the vibrator 15 on the base 12 side from canceling each other out.

In cases where the geology of the ground is relatively soft, energy can be saved by driving only with the vibrator attached to the holder 14 in this way. Furthermore, since the exciter attached to the holder 14 operates inside the tubular pile 11, noise is significantly reduced. Therefore, it is suitable for construction on land, especially in residential areas.

(Effects of the Invention) The present invention has the above-described configuration and has the following effects.

In other words, there is a base that can be raised and lowered facing the leader and into which the tubular pile to be driven can be inserted, an exciter attached to the base, and a base and a holder that can hold the tubular pile. Since it is equipped with a chuck mechanism, it is possible to drive the tubular pile while holding the middle part thereof. Then, when the vibrohammer has descended to a predetermined position, the holding of the tubular pile can be released and the vibrohammer can be raised to its original position again. By repeating these operations, the tubular pile of the desired length is Capable of driving piles.

Therefore, it is no longer necessary to add additional piles by welding or the like during driving, unlike in the past, and the pile driving operation can be performed extremely easily and quickly.

Further, since the chuck mechanism is composed of an outer claw member and an inner claw member, even in the case of a relatively thin tubular pile, the tubular pile will not be deformed due to holding.

Furthermore, when the vibro hammer according to the present invention is used, long tubular piles can be driven within a certain height range by repeatedly raising and lowering the vibro hammer. Therefore, the height of the turret can be made significantly lower than that of conventional turrets. This is very advantageous when there is a height restriction on the equipment for driving, such as construction under a bridge.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of a vibrohammer according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. FIG. 3 is an explanatory diagram of driving a pile using a vibro hammer according to the present invention, and FIG. 4 is an explanatory diagram of driving a pile using a conventional vibro hammer. 10... Vibro hammer, 11... Tubular pile 11
a...Inner peripheral surface, 11b...Outer peripheral surface 12.
...Base 13...Exciter 14...Holder 15...Outer claw member 16...Inner claw member 17...Chuck mechanism (1 other person) Figure 1 Ice] 7 10... Pipe Donkey〉7 11...Pg
1 lb. Inner circumferential surface 1 lb.
Outer peripheral surface 12...Perspective 1
3.Kiaiso. 14...Claw rotation 15...Outside placement part ↑ 16.Inner part not formed 17...
Te V Tsukui geometry diagram 2

Claims (1)

[Claims] (1) A base that moves up and down along the leader and into which the tubular pile to be driven can be inserted, an exciter attached to the base, and a holder that moves up and down inside the tubular pile; Through cooperation between a plurality of outer claw members attached to the base and protruding toward the outer circumferential surface of the tubular pile and a plurality of inner claw members attached to the holder and protruding toward the inner circumferential surface of the tubular pile. A vibro hammer that holds the intermediate portion of a pile, characterized by having a chuck mechanism that holds the tubular pile.