JPS638243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing sand piles in soft ground in order to improve the soft ground, and in particular, a method for constructing sand piles in soft ground. The sand is penetrated into the ground while being forcibly vibrated by a vibrator connected to the inner cylinder, and after the inner cylinder reaches a predetermined depth, sand is thrown into the outside of the outer cylinder from a hopper, while the inner cylinder is vibrated by a vibrator. The present invention relates to a method for constructing a sand pile in which the sand in the outer cylinder is compacted by moving the inner cylinder up and down at a predetermined stroke while pulling out the outer cylinder and the inner cylinder to form a sand pile, and an apparatus for carrying out this method. .

In order to create a strong sand pile using this type of sand pile construction method, the sand in the outer cylinder must be sufficiently compacted by the inner cylinder, and for this purpose, the vertical stroke of the inner cylinder must be sufficiently long. There is a need. However, in the conventional sand pile construction method of this type, a fluid pressure cylinder that moves the inner cylinder up and down is connected to the lower end of the exciter, and this cylinder directly moves the exciter up and down. Since the integral inner cylinder is moved up and down, the inner cylinder can only move up and down by the predetermined stroke of the piston rod in the fluid pressure cylinder.Therefore, in order to increase the vertical stroke of the inner cylinder, it is necessary to , a correspondingly long and large fluid pressure cylinder is required, and since the inner cylinder is coaxially suspended and connected to the lower end of the exciter, this inner cylinder driving cylinder is inevitably installed around the inner cylinder. It was necessary to install at least two units.

The present invention has a relatively short cylinder stroke, that is, even with a relatively small hydraulic cylinder, the vertical movement stroke of the inner cylinder can be sufficiently large, and only one hydraulic cylinder is required. It is an object of the present invention to provide a sand pile construction method and device that can efficiently create a pile and can reduce the equipment cost of a cylinder for driving the inner cylinder up and down to a minimum, thereby reducing the cost. An embodiment of the sand pile construction apparatus will be described below.

Figure 1 shows the overall diagram of the sand pile construction equipment. In this figure, 1 is a movable machine base, 2 is a leader that is erected and supported on this machine base, and 3 is a device that is installed on the leader 2 so that it can be raised and lowered. An outer cylinder 4 for making sand piles is suspended from the lower end of the elevator frame 3 via a sand charging hopper 16, and an exciter 5 is installed inside the elevator frame 3 to move the vertically The upper end of an inner cylinder 6 for sand pile construction inserted into the outer cylinder 4 is fixed to the lower end of this exciter 5, and between this inner cylinder 6 and the elevator frame 3, A connecting device 7 is provided which can be connected and disconnected from each other. And 8 is a hydraulic cylinder as a fluid pressure cylinder for vertically driving the inner cylinder.
It is inserted into the lower part of the leader 2 in a vertical and inverted form, and a pulley 10 is pivotally attached to the tip of the piston rod 9 of this hydraulic cylinder 8. Pulleys 11, 12, 13, 14 fixedly pivoted on the
An interlocking operation wire 15 is connected between the two, and one end of this wire 15 is connected to the exciter 5 side.
The other end is fixed to the lower end of the elevator frame 3, for example, to a sand charging hopper 16, respectively.

The elevator frame 3 is constructed in the shape of a turret with an upper frame 17, a lower frame 18, and four guide columns 19, front, rear, left, and right, whose upper and lower ends are fixed between the upper and lower frames 17 and 18, respectively. A sand charging hopper 16 is fixed to the lower surface side of the lower frame 18, and this hopper 1
6 is connected to the upper end of the outer cylinder 4 so as to communicate with the inside of the outer cylinder 4, and therefore the elevator frame 3, the hopper 16, and the outer cylinder 4 have a mutually integral structure. This elevator frame 3 is suspended from the top of the leader 2 by a lifting operation wire 20, and this wire 20 is led out from the mobile machine stand 1 side and passes through pulleys 21, 21 provided at the top of the leader to the machine frame 2. It is wound around a pulley 22 provided on an upper frame 17.
Further, guides 23 and 24 are provided on the side of the elevator frame 3, and these guides 23 and 24 are slidably engaged with guide rails (not shown) attached along the side of the leader 2. is arranged to move up and down along the leader 2.

The exciter 5 is fixed on a board 25 that can be slid up and down guided by the guide columns 19 of the elevator frame 3, and on this board 25 there are four supporting frames 26 in the front, rear, left and right sides. The support frames 26 are erected and fixed so as to surround the exciter 5, and an upper plate 27 is fixed to the upper ends of these support frames 26. One end of the interlocking operation wire 15 is fixed to the center of the upper surface of the upper plate 27. Furthermore, the upper end of the inner cylinder 6 is fixed to the center of the lower surface of the base plate 25, so that the vibration exciter 5 and the inner cylinder 6 are moved by the expansion and contraction of the wire caused by the operation of the hydraulic cylinder 8.
will move up and down at the same time. Note that the inner cylinder 6 is inserted into the lower outer cylinder 4 through an opening 28 provided at the center of the lower frame 18 that constitutes the elevator frame 3.

As shown in an enlarged view in FIG. 2, the connecting device 7 has a fixing block 30 fixed to the upper end of the inner cylinder 6, which has a pair of U-shaped female members 29, 29 each tapering outwardly on both sides. , a pair of fluid pressure cylinders 3 on both sides are mounted on the lower pedestal 18 constituting the elevator frame 3.
1 and 31 (see Fig. 1) to each cylinder 3.
A substantially wedge-shaped male member 33 having a shape corresponding to each of the outwardly expanding tapered female members 29 is fixed to the tip of the piston rod 32 of No. 1, and the male members 33, 33 are moved as shown in FIG. Female members 29, 29 on both sides of the fixing block 30 are shown in phantom lines.
The inner cylinder 6 side and the elevator frame 3 side are thereby integrally connected, and the male members 33, 33 are removed from the female members 29, 29 to separate them as shown by the solid line in the figure. This configuration is configured to release the connection between the inner cylinder 6 side and the elevator frame 3 side.

In FIG. 1, reference numeral 34 denotes a shock absorber provided at the upper end of each guide column 19 constituting the elevator frame 3.
→This is to absorb the vertical vibration transmitted to the guide column 19 via the lower mount 18 and to prevent the vibration of the exciter 5 from being transmitted to the reader 2. Reference numeral 35 denotes a shock absorber provided at the lower end of each support frame 26 erected on the board 25, which absorbs the vertical vibration transmitted from the exciter 5 to each support frame 26 via the board 25, and Therefore, the vertical vibration of the exciter 5 is prevented from being transmitted to the inner cylinder driving hydraulic cylinder 8 via the interlocking operation wire 15. These shock absorbers 34, 35 are, for example, the fourth
A spring-type shock absorber, such as the shock absorber 44 shown in the figure, can be used.

Next, the operation of the sand pile building apparatus having the configuration shown in FIG. 1 described above will be explained.

First, the elevator frame 3 with the outer cylinder 4 hanging therein is suspended and supported at an appropriate height from the top of the leader 2, and the interlocking operation wire 1 is held by holding the inner cylinder driving hydraulic cylinder 8 in the piston retracted position.
The exciter 5 is suspended and supported at the lower limit position within the elevator frame 3 via the exciter 5, and the coupling device 7 is operated in the connected state at this position to integrate the exciter 5 and the outer cylinder 4. By activating the exciter 5 from this state, forced vibration in the vertical direction by the exciter 5 is transmitted to the inner tube 6 and the outer tube 4, and while the lifting operation wire 20 is paid out, the outer tube 4 and the The inner cylinder 6 is penetrated into the ground. At this time, due to the action of the shock absorbers 34 and 35, the vertical vibration of the exciter 5 is not transmitted to the leader 2 or the hydraulic cylinder 8 for driving the inner cylinder, so that the wire 1
There is no risk that the hydraulic cylinders 5 and 20 will separate from the pulleys supporting them or damage the hydraulic cylinder 8.

Next, after the outer cylinder 4 is penetrated into the ground to a predetermined depth as described above, sand is poured into the outer cylinder 4 from the hopper 16. Then, the connection by the coupling device 7 is released, and the edge between the exciter 5 and the outer cylinder 4 is cut, so that the forced vertical vibration by the exciter 5 is not transmitted to the outer cylinder 4, and the inner cylinder 6 is connected to the outer cylinder. 4 and to be able to move up and down independently. Then, by operating the inner cylinder drive hydraulic cylinder 8 to extend and retract the piston rod 9, the interlocking operation wire 15
The exciter 5 is moved up and down via the
The inner cylinder 6, which is in an integral relationship with the inner cylinder 6, is moved up and down separately from the up and down vibration caused by the exciter 5. In this case,
Since the shaft of the pulley 10 pivotally attached to the tip of the piston rod 9 of the hydraulic cylinder 8 moves as the piston rod 9 expands and contracts, it constitutes a so-called movable pulley.
When this pulley 10 is moved up and down by the maximum stroke l of the piston rod 9, the interlocking operation wire 1
One end of the piston rod 5 can move up and down by twice the maximum stroke 1 of the piston rod 9, so that the inner cylinder 6 can move up and down with a stroke corresponding to 2L (see FIG. 1).

As described above, only the inner cylinder 6 performs vertical vibration by the vibrator 5 and another vertical movement at a predetermined stroke, so that the ground around the outer cylinder 4 is protected from being agitated by the outer cylinder 4, and The sand in the outer cylinder 4 is compacted by the inner cylinder 6. While the sand in the outer cylinder 4 is compacted by the inner cylinder 6, the elevator frame 3 is raised via the operating wire 20 and the outer cylinder 4 is gradually pulled out. A sand pile is formed while being pushed out from the lower end of the cylinder 4. A jet air supply pipe (not shown) is arranged in the axial direction along the outer surface of the outer cylinder 4, and a jet nozzle (not shown) at the tip of the pipe is opened inside the lower end of the outer cylinder 4. By injecting jet air from an air compressor through the pipe and from the nozzle, sand is effectively pushed out from the lower end of the outer cylinder 4, and a strong sand pile can be quickly constructed.

FIG. 3 shows another embodiment of the sand pile building device according to the present invention, and the device illustrated here includes the mounting position of the hydraulic cylinder 8 for vertically driving the inner cylinder and the fixing position of the interlocking operation wire 15. The other structure is the same as that of the previous embodiment shown in FIG. That is, according to the embodiment shown in FIG. 3, the inner cylinder driving hydraulic cylinder 8 is installed in a vertical and inverted shape at the top of the leader 2.
A pulley 1 is attached to the tip of the piston rod 9 of this cylinder 8.
0 is pivoted, and this pulley 10 and leader 2
One end of the interlocking operation wire 15 connected to pulleys 11 and 12 pivoted at the top is fixed to the upper part of the upper plate 27 of the frame holding the exciter 5, and the other end is connected to the elevator frame 3. It is fixed to the side, for example, at the upper end position of the sand charging hopper 16. The vertical movement of the inner cylinder 6 by the hydraulic cylinder 8 and the wire 15 is performed by the first
This is exactly the same as the case of the device shown in the figure.

4 and 5 show still other embodiments, and in these figures, 36 is an elevator frame, which is composed of an upper pedestal 37, a lower pedestal 38, and a guide column 39 to which both upper and lower ends are fixed. , this elevator frame 3
A guide 40 provided in the exciter 5 within the exciter 5
The vibration exciter 5 is arranged so as to be movable up and down along the guide column 39 through the wire 1 which interlocks the driving force of a fluid pressure cylinder (not shown) for driving the inner cylinder.
The upper end of the outer cylinder 4 is fixed to the lower end of the lower pedestal 38, and an inner cylinder 6, which is connected to and suspended from the exciter 5, is inserted into the outer cylinder 4. . And the exciter 5 and the lower frame 38 of the elevator frame 36
Bellows type air springs 41, 41 are interposed between the inner cylinder 6 on both sides thereof, and each bellows type air spring 41 is connected to a bellows 42 formed in a bellows shape from an elastic material such as rubber. and upper and lower end plates 43 and 44 attached to both upper and lower ends of the bellows 42, and the upper end plate 43 is connected to the lower substrate 45 of the exciter 5.
The lower end plates 44 are each fixed to the lower pedestal 38. Further, a spring-type shock absorber 46 is provided at the upper end of each guide column 39. 47 in the figure is the bellows 4 of the air springs 41, 41.
2 and 42 are filled with pressurized air, and the air spring 4
1 and 41 are sufficiently expanded and extended, the inner cylinder 6
This is a connecting device that is fixed to the lower frame 38 of the machine frame 36, and as is clear from FIG. Matching holes 49, 49 are provided,
On the other hand, a hydraulic cylinder 50 is installed on the lower pedestal 38, and the piston rod 51 is integrally equipped with engaging protrusions 53, 53 at one end via a bracket 52.
The engagement protrusions 53, 53 are fitted into and disengaged from the engagement holes 48, 48 by the movement of the piston rod 51 back and forth by the operation of the hydraulic cylinder 50. Incidentally, 54 indicates a hopper for introducing sand. In operation of the device according to the embodiments described above,
When the outer cylinder 4 penetrates into the ground, the air spring 41,
Pressurized air is filled into the bellows 42, 42 of 41 to fully inflate and extend the air springs 41, 41 to the state shown by the imaginary line in FIG. At the same time, the inner cylinder 6 is fixed to the lower pedestal 38 by a connecting operation by the connecting device 47, and in this way, the exciter 5 and the outer cylinder 6 are integrally connected via the air springs 41, 41. The exciter 5 is forcibly vibrated vertically to cause the outer cylinder 4 and the inner cylinder 6 to vibrate.
penetrate into the ground. After penetrating to a predetermined depth, the fixation of the inner cylinder 6 by the connecting device 47 is released, and the pressurized air is released from the air springs 41, 41 to the contracted state as shown by the solid line in FIG. As the cylinder 4 is pulled out, the hydraulic cylinder for driving the inner cylinder is actuated to move the exciter 5 up and down within the elevator frame 36 via the wire 15, thereby moving the inner cylinder 6 up and down with a predetermined stroke. The air spring 41 acts to connect the exciter 5 and the outer cylinder 4 when it is pressurized and expanded, and acts as a so-called shock absorber when it contracts, so that the vertical vibration of the exciter 5 is absorbed by the outer cylinder 4. and prevents it from being transmitted to the machine frame 36.

As explained above, in the present invention, after the outer cylinder reaches a predetermined depth, sand is introduced into the outer cylinder from the hopper, while only the inner cylinder is vibrated by the vibrator, and one end of the inner cylinder is The other end is fixed to the exciter side and the other end is fixed to the elevator frame side, and the middle part is connected to the pulley at the tip of the piston rod of the fluid pressure cylinder for vertically driving the inner cylinder installed in the leader and to the pulley on the leader side. Since the piston rod is moved up and down by the cylinder via a wire, the pulley at the tip of the piston rod acts as a so-called moving pulley, and the vertical stroke of the inner cylinder is equal to the cylinder stroke of the hydraulic cylinder for vertically driving the inner cylinder. The inner cylinder can be moved up and down over a long stroke with a relatively short stroke of the hydraulic cylinder, and the sand in the outer cylinder is sufficiently compacted by the inner cylinder to form a solid sand. Piles can be created efficiently.
Furthermore, according to the present invention, there is no need to provide two or more fluid pressure cylinders for vertically driving the inner cylinder as in the conventional case, and only one fluid pressure cylinder is required, and a small fluid pressure cylinder can be used. It is possible to provide a sand pile construction device that is small in size, compact, and lightweight, and is inexpensive and has good workability.

[Brief explanation of the drawing]

Fig. 1 is a partially cross-sectional overall side view showing one embodiment of the sand pile building device of the present invention, Fig. 2 is an enlarged perspective view of a connecting device in the device of Fig. 1, and Fig. 3 shows another embodiment. 1 is a side view similar to that of FIG. 1, and FIG. 4 is a side view of a main part showing still another embodiment, in which the air spring is contracted, and FIG. 5 is a perspective view of the device part shown in FIG. 4. In this figure, the air spring is in an extended state. 2...Leader, 3...Elevator frame, 4...Outer cylinder,
5... Exciter, 6... Inner cylinder, 7... Connecting device, 8
...Fluid pressure cylinder for vertically driving the inner cylinder, 9...Piston rod, 10...Pulley, 15...Wire,
16...Hopper for feeding sand.

Claims (1)

[Scope of Claims] 1. An outer cylinder that is connected to the lower end of the elevator frame that can be raised and lowered freely relative to the leader via a sand charging hopper, and an outer cylinder that is inserted into the outer cylinder and whose upper end extends inside the elevator frame. The inner cylinder is fixed to an exciter that can move up and down,
The outer cylinder is penetrated into the ground while being forced to vibrate with a vibrator, and after the outer cylinder reaches a predetermined depth, sand is thrown into the outer cylinder from a hopper while the inner cylinder is vibrated with an exciter and the inner cylinder is One end is fixed to the exciter side, the other end is fixed to the elevator frame side, and the middle part is attached to the pulley at the tip of the piston rod of the fluid pressure cylinder for vertically driving the inner cylinder and the pulley on the leader side, which is installed in the leader. A method for constructing a sand pile, in which the sand pile is moved up and down by the fluid pressure cylinder via connected wires to compact the sand in the outer cylinder. 2. An elevator frame with an outer cylinder hanging down and connected to the lower end via a sand charging hopper is equipped on the leader so that it can be raised and lowered freely, and an exciter is disposed within this elevator frame so as to be able to move up and down, and this exciter A means for fixing the upper end of the inner cylinder inserted into the outer cylinder and integrally connecting or disconnecting the vibration exciter and the outer cylinder is provided at the lower end of the leader. A fluid pressure cylinder for driving the inner cylinder up and down is installed at a required part of the leader, a pulley is installed at the tip of the piston rod, and one end of a wire connected to this pulley and a pulley fixedly installed at a required part of the leader is connected to an exciter. A sand pile making device characterized by having one end fixed to one side and the other end fixed to an elevator frame side.