JPS6026888B2 - pile driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile driver that lowers a pile while rotating it forward and backward.

In recent years, the noise and vibration caused by pile driving work has been attracting a lot of attention as the construction pollution that it causes to nearby residents.

Therefore, conventional vibration-free construction methods include the medium digging method, in which the soil at the tip of the pile is penetrated by using a hole in the center of the pile body with an auger, special bucket, water jet, etc.; The pre-boring method, in which a hole is drilled into the ground and piles are built into the hole, has been used, but all of these methods have the drawback that construction management is extremely difficult.This invention solves this problem and provides vibration-free construction. To provide a pile driver capable of driving piles without noise and with simple construction.

Therefore, in the present invention, a rotary force biasing wheel is rotatably supported on a fixed base frame, and a pile having a protrusion in the wisteria direction on the outer circumferential surface is inserted adjacently so as to be movable in the axial direction. A hole is formed concentrically in the rotary force biasing wheel, and a groove capable of engaging with the protrusion and biasing the rotational force to the pile is formed on the inner surface of the hole, An arm is integrally formed with the wheel, a cylinder device for rotating the rotary force biasing wheel in forward and reverse directions is connected to the arm via the arm, and the pile is lowered in an axis 0 direction to penetrate into the ground. The means of descent to
It is installed on the guide pillar of the base frame so that it can be raised and lowered.

Embodiments of the present invention will be described below based on the drawings.

1 to 6 show a first embodiment of the present invention, in which 1 is a pile driver equipped with a traveling means 2, and a fixed base frame 3 thereof.
A rotation device 6 for rotating the steel pipe pile 5 in forward and reverse directions at a fixed angle is provided on the base frame 3 and located between the pair of guide columns 4, 4 erected. A lowering means 7 is provided for applying a lowering force to the head of the steel pipe pile 5. As shown in FIGS. 7 and 8, the steel pipe pile 5 has four protrusions 8 fixed to its circumferential surface, and four cutters 9 made of rectangular plates curved in an arc shape are fixed to the tip. ing. The cutter 9 has cutting edge portions at a tip green 9a and both side greens 9b. Note that it is convenient for manufacturing steel pipe piles to attach the cutter 9 to the steel pipe pile body via the attachment ring 15 as shown in FIG. As shown in FIG. 3, the rotating device 6 includes a rotating force biasing wheel 12 supported on the base frame 3 via a support member 10 and a bearing 11 so as to be rotatable, and a driving device 13 for the wheel.

As shown in FIG. 4, the wheel 12 is provided with a hole 14, into which the steel pipe pile 5 is inserted, at the same position as the center axis of rotation. Reference numeral 16 indicates a steel pipe pile abutment protrusion provided to form a gap in which the blade 9 is played, and 17 is a groove for allowing the protrusion 8 to play.

To explain the drive device 13, reference numeral 18 denotes a hydraulic cylinder as a cylinder device which is disposed on both sides of the rotary force urging wheel 12 and one end of which is rotatably supported on a holding base 19, and the tip of the telescopic rod 18a is attached to the wheel 12. Arms 20' integrally protruding from 12 are rotatably connected to each other by a pin 21. Thus, the telescopic rods 18a, 18a of the two hydraulic cylinders 18, 18 are operated in forward and reverse directions in opposition to each other by the operation of a solenoid valve with a limit switch (not shown).
As a result, the rotating force urging wheel 12 continuously rotates forward and backward at an angle corresponding to the stroke of the rod 18a. As shown in FIG. 5, the lowering means 7 is constructed by fixing a lowering hydraulic cylinder 23 to a movable frame 22 installed between both guide columns 4, 4 so as to be able to rise and lower freely. A rotation stopper 24 is attached to the rod to prevent rotation of the rod, and a rotating metal fitting 25 is attached to the thrust bearing 26 to bring the core metal 24 into contact with the head of the steel pipe pile 5 and to prevent the rod from rotating. It is rotatably attached via a bearing 28. 27 is a hook for hanging steel pipe piles, bearing 2
It is rotatably attached to the rotary fitting 25 via the rotary member 8.

On the other hand, the guide column 4 is made of H-shaped steel, and the movable frame 22
Fixing holes 29 for fixing the movable frame 22 are bored at the same intervals as the piston stroke of the lowering hydraulic cylinder 23.
A hydraulic cylinder 3 for insertion and removal, which has fixing pins 30 located at both ends of the
1 is fixed. 32 is a hydraulic cylinder 31 for insertion and removal.
and an IJ limit switch for operating the movable frame hanging device 33, which will be described later, which is attached to the movable frame 22 and is connected to the stopper shaft 34 erected on the rotation stopper 24 for contact with the limit switch 32. An upper stopper 35 and a lower stopper 36 are attached.

The movable frame hanging device 33 consists of a winch 44 and a wire 45, and the tip of the wire 45 is connected to the beam 4 at the upper end of the guide column 4.
The movable frame 22 is fixed to the beam 46 through a sheave 37 provided on the movable frame 22 and a sheave 38 provided on the movable frame 22.

In FIGS. 1 and 2, 39 is a cylindrical guide plate for suspending and installing the steel pipe pile 5, and is fixed to the center of the front end of the base frame 3.

401 is a bank stay for supporting the guide column 4, and 47 is an outrigger.

In FIG. 3, reference numeral 41 denotes a gas cutting device for cutting steel pipe piles, which is located below the rotary force urging wheel 12 and attached to the base frame 3, and is composed of a gas cylinder 42 and a nozzle 43. next,
When the pile driving operation is set, the movable frame 22 moves to the guide column 4.
With the steel pipe pile 5 fixed in the fixing hole 29 with the fixing pin 30, the steel pipe pile 5 is rotated forward and backward at a constant angle by the rotating force urging wheel 12, and a lowering force is applied to the steel pipe pile 5 by the lowering hydraulic cylinder 23. The steel pipe pile 5 is energized and penetrated into the ground, but since the steel pipe pile 5 penetrates while cutting into the ground by forward and reverse rotation of the steel pipe pile 5, it can be easily penetrated by the pressing force of the lowering hydraulic cylinder 23. Can be done.

Furthermore, even if there is an obstacle such as wood in the soil, it can be easily penetrated and the pile can be submerged. In this way, when the hydraulic cylinder 23 penetrates for one stroke, the upper stopper 35 of the stopper shaft 34 erected on the rotation stopper 24 comes into contact with the limit switch 32, and as a result, the hydraulic cylinder 31 for insertion and removal The piston operates and the fixing pin 30 is pulled out from the fixing hole 29, the lower pressure of the lowering hydraulic cylinder 23 is released, the magnetic brake of the winch 34 is released, the wire 35 is loosened, and the lowering hydraulic cylinder 23 is released. The possible frame 22 descends while contracting.
When the movable frame 22 descends to a level corresponding to the fixed hole 29 one pitch below, the hydraulic cylinder 31 for insertion/extraction is activated, and the fixed pin 30 is inserted into the fixed hole 29, whereby the movable frame 22 is guided. It is fixed to pillar 4. In this way, when the movable frame 22 is lowered by one pitch, the steel pipe pile 5 is lowered again while rotating forward and backward as described above, and by repeating this, it is possible to penetrate to a predetermined depth. Can be done. Further, the steel pipe pile 5 is connected to a rotary force biasing wheel 12.
Since the pile is pushed down with the pile facing upward, the pitching position is accurate, the angle is properly controlled, there is no wobbling, and bending and deformation of the pile can be prevented, allowing the work to proceed efficiently.
Moreover, it is also possible to drive diagonal piles. In addition, with conventional impact driving, the normal ground is compressed and densified, and in soft ground, the soil surrounding the pile tends to move to the sides or top, so it is difficult to prevent walls, revetments, etc. If the site is adjacent to the pile driving site, or if the surrounding area of the site is such that the pile group is surrounded by pile retaining or continuous underground walls, the driving of piles may cause geological movement or deformation. occurs and has a negative impact on them. If the piles are arranged closely, the ground will be compacted, so if the piles to be driven later are in the center, it will be difficult to drive them to the specified depth, and the piles in the surrounding areas will be subject to harmful bending stress. may occur. However, pile driving as described above has less impact on the surrounding ground, and can be used when driving a large number of piles in a narrow space or when there is an important structure nearby. can. In addition, in order to push down the steel pipe pile 5 until it comes out of the rotary force urging wheel 12, an odor pickup (not shown) having a cross-sectional shape similar to that of the steel pipe pile 5 is used.
may be fixed to the head of the steel pipe pile 5.

Incidentally, the steel pipe pile 5 must be driven to a predetermined depth, but due to undulations of the supporting layer, etc., it may become impossible to drive the pile before the predetermined depth is reached, and the head of the steel pipe pile 5 may need to be cut off. However, when the gas cutting device 41 is provided as described above, the pressing force of the descending hydraulic cylinder 23 is reduced to zero, and the steel pipe pile 5 is rotated by the rotary force urging wheel 12, thereby removing the crater from the crater 43. The entire circumference of the steel pipe pile 5 can be cut with the flame. If it is necessary to drive the steel pipe pile 5 deeply, as shown in FIG. It is sufficient to connect it to the head of No. 5 by welding and stake it in the same manner as above.

To explain how to install the steel pipe pile 5 on this pile driver, first, the steel pipe pile 5 is laid down in front of this device (left side in Figure 1) with the head facing toward the pile driver. Keep this steel pipe pile 5
The head of the lowering hydraulic cylinder 23 is connected to a wire (not shown) connected to the hook 27 at the tip of the lowering hydraulic cylinder 23.

Next, the steel pipe pile 5 is lifted along the guide plate 39 by raising the movable frame 22 with the wire 45 of the hanging device 36, and further lifted until the lower end comes off the guide plate 39, and the rotating force urging wheel 12 is lifted. hang vertically upwards. Then, by lowering it as it is, the iron can be inserted into the iron insertion hole 14 of the wheel 12. 10th
The figures and FIG. 11 show another embodiment, and to explain the difference from the previous embodiment, the entire rotating device 6 is installed on the lower surface of the base frame 3 of the pile driver 1.

FIGS. 12 and 13 show still another embodiment, in which the movable frame 22 is pulled down by a wire 49 with one end wrapped around a winch 48,
A fitting 25 for abutting the head of the steel pipe pile 5 is directly attached to the movable frame 22.

The wire is connected to the sheave 5 provided on the movable frame 22 and the base frame 3.
0 and 51, and the other end is fixed to the base frame 3 at position 52. According to such a configuration, the wire 4 is rotated while the steel pipe pile 5 is rotated by the rotary force urging wheel 12.
By lowering the movable frame 22 at step 9, the steel pipe pile 5 is penetrated into the ground in the same manner as described above, but in this case there is an advantage that the work of lowering the steel pipe pile 5 can be carried out continuously until it reaches a predetermined depth.

In each of the above embodiments, the means 7 for lowering the steel pipe pile 5 was configured using the hydraulic sill 23 and the lowering wire 49, but instead of these, a high-frequency micro-vibration generating means (not shown) is provided in the movable frame 22. Even if it is installed, the same vibration-free and noise-free pile driving as described above can be performed.

This invention can be carried out as described above, and according to this, the steel pipe pile is rotated in forward and reverse directions while applying a descending force, so that the steel pipe pile can penetrate while cutting with the cutter at the tip of the steel pipe pile. Therefore, the pile can be easily penetrated by the above-mentioned lowering force.

Since the penetrating material is penetrated by such a descending means, there is no problem of vibration or noise. Furthermore, compared to the conventional non-vibration construction method, it requires fewer steps, has high construction efficiency, and is easy to manage. Furthermore, compared to the drop hammer type, it has less impact on the surrounding ground and has a wider range of application to ground conditions. - Also, since the pile is inserted into the rotary force biasing wheel so that it can move freely in the direction of the center of the pile, when the pile is lowered in the axis 0 direction and penetrates into the ground, the rotary force biasing wheel is inserted into the pile together with the pile. Because it does not move, the rotary force biasing wheel can be reliably supported in a fixed position on the base frame, and there are no arms, cylinders, etc. to rotate the rotary force biasing wheel in forward and reverse directions. The mechanism can be simplified.

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the present invention.
The figure is a side view of the whole, Figure 2 is a front view of the lower part of the pile driver, 38
The figure is a vertical sectional front view of the rotating device, Figure 4 is a plan view of the rotating device, Figure 5 is a cutaway front view of the lowering means, Figure 6 is a cutaway front view of the movable frame fixing means, and Figure 7 is a steel pipe pile. Cutaway side view of No. 8
The figure is a bottom view of the same, Figure 9 is an explanatory diagram when adding steel pipe piles, Figure 10 is a side view of another embodiment, Figure 11 is a front view of the same, and Figure 12 is still another embodiment. side view, 1st
Figure 3 is a front view of the same. 1... Pile driving rock, 3... Base frame, 4... Guide pillar, 5...
・Steel pipe pile, 6... Rotating device, 7... Lowering means, 8.
...Feather key, 9...Knife, 12...Rotational force biasing wheel, 14...Iron insertion hole, 15...Key groove, 22...Movable frame. Traditional / Figure 2 Festival〆〆〆〃〃〃〃〃〃〃〃〃〃〃〃〃〃Mackerel〃〃Group of Figures

Claims (1)

[Claims] 1 A rotary force biasing wheel is rotatably supported on a fixed base frame, and a hole into which a pile having an axial protrusion on the outer circumferential surface is inserted so as to be freely movable in the axial direction is provided in the rotary base frame. A groove is formed concentrically on the power biasing wheel and is capable of engaging with the protrusion to apply a rotational force to the pile, and an arm is provided on the rotational force biasing wheel. A lowering means is formed integrally and is connected to the arm through the arm to rotate the rotary force biasing wheel in forward and reverse directions, and lowers the pile in the axial direction to penetrate into the ground. A pile driver, characterized in that it is installed on a guide column of a base frame so that it can be raised and lowered.