JPS5810528B2 - sand pile creation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand pile construction device for constructing sand piles in soft ground in order to improve the soft ground. To provide a sand pile building device capable of building a solid and strong sand pile by moving an inner cylinder to be hardened up and down reliably and smoothly along the axis of an outer cylinder with a long stroke.

Embodiments of the present invention will be described below based on the drawings. FIG. 1 shows an overall view of a sand pile construction device, and this device includes a long outer cylinder 1 and an upper end of the outer cylinder 1. a hydraulic cylinder 2 for driving an inner cylinder arranged concentrically with the outer cylinder 1;
A plurality of columns 3 are erected upward from the upper end, and these columns 3 are equipped with four exciters that can be raised and lowered. An inner cylinder 5 that is suspended and whose upper end is fixed to the lower end of the exciter 4, a shock absorber 6 interposed between the exciter 4 and the hydraulic cylinder 2, and each of the supports 3 It also includes another shock absorber 7 interposed in the middle.

The outer cylinder 1 has a cylindrical shape, and a short pipe 8, which is also cylindrical and has a larger diameter than the outer cylinder 1, is fixed to the upper end of the outer cylinder 1.
Hoppers 9 for feeding sand are fixedly installed on both the left and right sides of the short pipe 8, and the hoppers 9 are communicated with the short pipe 8 and the outer cylinder 1.

A rectangular fixing plate 10 is mounted and fixed on the upper end of the short pipe 8, and each of the pillars 3 is arranged at the four corners of the fixing plate 10 so as to extend upward along the axial direction of the outer cylinder 1. These pillars 3 are fixedly erected, and a rectangular lifting plate 11, which is the same as the fixed plate 10, is attached to these pillars 3 so as to be able to rise and fall freely, and the exciter 4 is mounted on the lifting plate 11.

As is clear from FIGS. 1 and 2, the hydraulic cylinder 2 for driving the inner cylinder penetrates through the center of the fixed plate 10 and is inserted into the short pipe 8. The cylinder case 2a is fixed to the fixed plate 10 by welding or the like, and the hollow piston rod 2b is made to protrude upward.

On the other hand, as is clear from FIG. 2, shock absorbers 6.6 are arranged on both front and rear sides of the inner cylinder 5 on the lower surface side of the elevating plate 11, and the upper end of each shock absorber 6 is attached to the elevating plate 11. At the same time, the lower end of each shock absorber 6 is connected and fixed to the tip of the piston rod 2b of the hydraulic cylinder 2 via a connecting plate 16, which will be described later.

As shown in FIG. 3, each of the shock absorbers 6 is composed of a so-called air spring, and has a circular upper end plate 12.
, a bellows 13 formed in a bellows shape from an elastic member such as rubber, a plurality of cushion rings 14 fitted in respective grooves of the bellows 13, and a circular lower end plate 15.

Engagement claws 12a and 15a, which closely engage the end portions of the bellows 13, are provided on the front faces of the end plates 12.15 in an annular shape, respectively.

When installing the shock absorber 6, the end plates 12 and 15 are attached to both the upper and lower ends of the bellows 13, the upper end plate 12 is fixed to the lower surface of the elevating plate 11 with bolts, nuts, etc., and the lower end plate 15, a rectangular connecting plate 16
The mounting portion 17 provided at the tip of the piston rod 2b of the hydraulic cylinder 2 is connected and fixed to the bottom surface of the connecting plate 16 with bolts and nuts (not shown), and the connection A plurality of guide rods 18, which are set upright and rotated on a plate 16, are inserted through the elevating plate 11 through guide sleeves 19, respectively.

Although not shown, an air circulation pipe is connected to an air circulation hole provided on the upper end plate 12 side of the shock absorber 6, and an air supply port and an exhaust port provided on the air circulation pipe are connected to each other. An air hose from a compressor is connected, and when the shock absorber 6 is used, the bellows 13 is filled with pressurized air to keep the bellows 13 in an extended state at all times.

This shock absorber 6 serves to prevent forced vibrations caused by the vibrator 4 from propagating to the hydraulic cylinder 2.

The inner cylinder 5 has a circular shape and is slidably inserted into the hollow piston rod 2b of the hydraulic cylinder 2, and the upper end of the inner cylinder 5 is fixed to the center of the lower surface of the elevating plate 11. be.

In addition, this inner cylinder receives forced vibration from the vibrator 4 through the elevating plate 11, and vibrates itself vertically.
Accompanying the vertical reciprocating movement of the piston rod 2b due to the operation of the hydraulic cylinder 2, a vertical movement separate from the above-mentioned vertical vibration is performed.

When the piston rod 2b of the hydraulic cylinder 2 reaches the upper limit position of the predetermined stroke, the inner cylinder 5 and the outer cylinder 1 are in contact and engage with each other.
A vibration transmitting means is provided to integrate the two and thereby transmit the vibration of the starter 4 to the outer cylinder 1.

As shown schematically in FIG. 1 and specifically shown in FIG. 4, this vibration transmitting means includes an annular locking member 20 fixedly attached to a predetermined position in the upper part of the inner cylinder 5, and an elastic member fitted therein. The cylinder 21 and the piston rod 6b of the hydraulic cylinder 2 are provided, for example, at a required part inside the short pipe 8 so that the cylinder 21 and the piston rod 6b of the hydraulic cylinder 2 can abut and engage with the locking member 20 via the ring 21. It consists of an annular stopper member 22, and when the locking member 20 abuts against the stopper member 22 and is locked, the forced vibration by the vibrator 4 is transmitted to the inner cylinder 5 via the elevating plate 11, and the inside of the stopper member 22 is stopped. It is transmitted from the cylinder 5 to the outer cylinder 1 through the short pipe 8 through the above-mentioned transmission means, and the outer cylinder 1 is forcibly vibrated up and down.

Therefore, when the vibration transmitting means is in the disengaged state, the vibration of the exciter 4 is not transmitted to the outer cylinder 1.

In other words, the outer cylinder 1 is not subjected to forced vibration except when the hydraulic cylinder 2 is at the upper limit position.

Incidentally, the timing and duration of the forced vibration of the outer cylinder 1 can be set as desired by appropriately controlling the oil supply and oil drain of the hydraulic cylinder 2.

Another shock absorber 7 interposed on each of the pillars 3 is
As shown in FIG. 5, the lower end of the hollow cylindrical tube 23 is fixed to the upper end of the support 3, and the cylindrical tube
A shaft member 24 is inserted into the shaft member 24 so as to be freely raised and lowered, a spring receiver 25 is attached to the lower end of the shaft member 24, and a compression coil spring 2 is inserted between the spring receiver 25 and the cylindrical tube 23.
6 is inserted.

The upper ends of each shaft member 24 are connected to each other by a connecting member 27, and a sheep 28 is attached on this connecting member 27 (
(See FIG. 1) FIG. 6 shows another embodiment of the shock absorber 6 described above, and shows a shock absorber 29 made of coil spring means.

This shock absorber 29 has lower spring receivers 30 on both sides of the connecting plate 16, which is fixed to the mounting portion 17 at the upper end of the piston rod 2b of the hydraulic cylinder 2 with bolts and nuts (not shown), on both sides of the inner cylinder 5. 30, and attach these spring receivers 30 and 30 to bolts (not shown).
It is fixed on the connecting plate 16 with nuts etc., and the elevating plate 11
The upper spring receiver 31 is mounted and fixed at a position facing each of the lower spring receivers 30 on the lower surface using bolts and nuts (not shown), and a guide rod 32 is installed and fixed in the center of each lower spring receiver 30. The upper end is inserted into the guide hole 33 passing through the lifting plate 11 and the upper spring receiver 31 via the guide sleeve 34, and the upper and lower spring receivers 30, 31 are connected by the inner coil spring 35 and the outer coil spring 36. The function of this shop absorber 29 is the same as that of the shock absorber 6 made of an air spring described above.

A jet nozzle 3T is fixed to the lower end of the outer cylinder 1 and projects inwardly through the outer cylinder 1, and a jet air supply pipe 38 is connected to the outer surface of the outer cylinder 1 along the axis of the outer cylinder 1. The lower end of this pipe 38 is connected to the jet nozzle 37.
At the same time, an air hose or the like from a compressor (not shown) is connected to the upper end of the pipe 38, so that jet air from the jet nozzle 37 is injected into the lower end of the outer cylinder 1.

Next, construction work using the sand pile construction apparatus having the above-mentioned configuration will be explained with reference to FIG. 7.

(A) First, the sand pile making device is suspended from a leader (not shown) via a sheave 28 by a wire (not shown), and is positioned at a predetermined position on the soft ground G to be improved.

Next, by operating the inner cylinder driving hydraulic cylinder 2 and raising the piston rod 2b to the upper limit position,
By bringing the vibration transmitting means 20 and 22 into a locked state, integrating the exciter 4 and the outer cylinder 1, and operating the exciter 4,
The forced vibration of the vibrator 4 in the vertical direction is transmitted to the outer cylinder 1 and the inner cylinder 5, and the outer cylinder 1 and the inner cylinder 5 are caused to penetrate into the ground G.

During this time, the piston rod 2b of the hydraulic cylinder 2 is held at the upper limit position.

Also, at this time, the shock absorber 6 absorbs vibrations that are about to propagate from the exciter 4 to the hydraulic cylinder 2 through the lifting plate 11, so the vibrations are not transmitted to the hydraulic cylinder 2, thereby damaging the hydraulic cylinder 2. In addition, the shock absorber 7 provided in the middle of the support column 3 absorbs the vibration propagated from the vibration exciter 4 via the fixed plate 10 and the support column 3, and therefore, the mechanical vibration is suppressed during the penetration of the outer cylinder 1. There is no possibility that the vibration of machine 4 will be transmitted to the reader.

(0) After the outer cylinder 1 is penetrated into the ground G to a predetermined depth, sand is thrown into the outer cylinder 1 from the hopper 9.

(c) Then, the upper limit position of the hydraulic cylinder 2 is released and the piston rod 2b is lowered while the vibration transmission means is disengaged, thereby causing the vibration exciter 4 and the outer cylinder 1 to disengage.
to prevent the vibration from the exciter 4 from being transmitted to the outer cylinder 1.

Then, while only the inner cylinder 5 is vibrated vertically by the vibration machine 4,
The upper limit position of the stroke of the hydraulic cylinder 2 is set slightly lower than the initial position, and the piston rod 2b is raised and lowered at the set stroke to such an extent that the vibration transmission means is not in a locked state. It is caused to move up and down separately from the up and down vibration caused by 4.

Then, the ground G around the outer cylinder 1 is protected from being stirred by the outer cylinder 1, and the sand in the outer cylinder 1 is not tamped by the inner cylinder 5 and is pushed out from the tip of the outer cylinder 1.

In this case, since the vertical movement of the inner cylinder 5 is performed by the reciprocating movement of the piston rod 2b of the hydraulic cylinder 2, the inner cylinder 5
The vertical stroke of the can be made sufficiently long.

Therefore, the inner cylinder 5 can more fully compact the compacted sand in the outer cylinder 1, and can also push out a large amount of compacted sand in the outer cylinder 1 at once, improving work efficiency. be done.

Then, while the sand in the outer cylinder 1 is compacted with the inner cylinder 5, the outer cylinder 1 is gradually pulled out.

By doing this, the sand comes out well, and there is no need to stop pulling out the outer cylinder 1, so the work efficiency can be improved.

Furthermore, by injecting air from the jet nozzle 37, the sand is pushed out from the tip of the outer cylinder 1, and together with the extrusion and tamping of the inner cylinder 5, a stronger sand pile can be created quickly. .

Furthermore, if the outer cylinder 1 cannot be pulled out easily at first, the piston rod 2b of the hydraulic cylinder 2 is raised to the original maximum position to bring the vibration transmitting means into the locked state. The outer cylinder 1 is integrated with the exciter 4.
By transmitting vibration to the outer cylinder 1, the resistance of the ground G around the outer cylinder 1 is reduced, and the outer cylinder 1 can be pulled out.

Then, after pulling out the outer cylinder 1 a little (about 1 to 2 m), adjust the upper limit position of the hydraulic cylinder 2 slightly lower again to cut the edge between the outer cylinder 1 and the exciter 4, and then move the inner The outer cylinder 1 is pulled out while compacting the sand with the cylinder 5.

In addition, the vibration transmission means should be kept in a stable state (i.e.,
When the inner cylinder 5 is reciprocated up and down by the hydraulic cylinder 2 (in a state where the outer cylinder 1 and the starter 4 are not integrated), the upper limit position of the hydraulic cylinder 2 can be adjusted by using an appropriate hydraulic control device ( (not shown).

), strong sand piles are created in the soft ground G as described above.

As is clear from the description of the embodiments above, the sand pile construction device of the present invention has a hydraulic cylinder for driving the inner cylinder installed at the upper end of the outer cylinder, and a support installed above the upper end of the outer cylinder. It is equipped with a vibrator that can be raised and lowered, and the upper end of the inner cylinder, which is inserted into the outer cylinder through the hollow piston rond of the hydraulic cylinder and is suspended, is fixed to the lower end of the vibrator. The hydraulic cylinder can move the inner cylinder up and down with a long stroke, which makes it possible to compact the compacted sand in the outer cylinder even more strongly, and also to push out a large amount of compacted sand in the outer cylinder at once. Therefore, a strong sand pile can be obtained and the workability of the sand pile construction work can be improved.

In addition, since the hydraulic cylinder is arranged concentrically with the outer cylinder and the inner cylinder is inserted through the piston rod, it is not only possible to center the inner cylinder easily and accurately when installing it, but also to Since the inner cylinder can be reliably and smoothly reciprocated linearly along the axis of the outer cylinder, the sand thrown into the outer cylinder is compacted evenly and evenly, making the entire sand pile homogeneous and stronger. This has the effect of creating sand piles that are of a high quality.

Furthermore, a shock absorber is installed on the exciter side, and the lower end of the exciter is connected to the tip of the piston rod of the hydraulic cylinder via this shock absorber, so that the forced vibration of the exciter is transmitted to the shock absorber. There is no risk of damage to the hydraulic cylinder or loss of operability.

[Brief explanation of the drawing]

The drawing shows one embodiment of the sand pile construction device of the present invention.
Figure 1 is a partial cross-sectional front view of the sand pile making equipment, and Figure 2 is the
II-I [Fig. 3 is an enlarged longitudinal sectional view of the shock absorber connected to the hydraulic cylinder;
The figure is an explanatory cross-sectional view showing the vibration transmission means, Figure 5 is an enlarged longitudinal cross-sectional view of the shock absorber installed on the support column, and Figure 6 is the third
FIG. 7 is an enlarged vertical cross-sectional view showing another example of the shock absorber shown in FIG. 7, and FIGS. 1... Outer cylinder, 2... Hydraulic cylinder for driving the inner cylinder, 2a...
Cylinder case, 2b...Piston rod, 3...Strut, 4...Exciter, 5...Inner cylinder, 6...Shock absorber, 9...Sand charging hopper, 10...Fixing plate, 11 Elevating plate.

Claims (1)

[Claims] 1. A hydraulic cylinder for driving the inner cylinder is arranged concentrically with the outer cylinder at the upper end of the outer cylinder, and a hopper for feeding sand that communicates with the outer cylinder is installed on the side of the hydraulic cylinder. A support is erected upward from the upper end, and an exciter is installed on this support so that it can be raised and lowered.The lower end of the exciter is equipped with an outer cylinder that is slidably inserted into the hollow piston rod of the hydraulic cylinder. A sand pile making device comprising: fixing an inner cylinder which is inserted in a hanging manner; and connecting the lower end of the vibrating machine and the tip of the piston rod of the hydraulic cylinder via a shock absorber.