JPS5833329B2 - 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 making device capable of moving an inner cylinder to be hardened up and down with a long stroke to obtain a strong sand pile and improving workability.

Hereinafter, embodiments of the present invention will be described 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 plurality of struts 2 erected upward, a vibrator 3 mounted on these struts 2 so as to be able to rise and fall freely, and an excitation machine 3 which is inserted into the outer cylinder 1 and suspended, and its upper end is fixed to the lower end of the vibrator 3. an inner cylinder 4, a hydraulic cylinder 5 and a shock absorber 6 interposed between the upper end side of the outer cylinder 1 and the lower end side of the exciter 3; It is equipped with a shock absorber 7.

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, and the left and right sides of the short pipe 8 are used for charging sand, respectively. A hopper 9 is fixed, and the hopper 9 is 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 tube 8, and each of the pillars 2 is arranged at the same part of the fixing plate 10 so as to extend upward along the axial direction of the outer cylinder 1. These columns 2 are fixedly erected, and a rectangular lifting plate 11 with a fixing plate 10 is attached to these pillars 2 so as to be movable up and down, and the vibration machine 3 is mounted on this lifting plate 11.

As is clear from FIGS. 1 and 2, hydraulic cylinders 5.5 are arranged vertically on both front and rear sides of the short pipe 8, and the cylinder case 5a of each hydraulic cylinder 5 is mounted on a fixed plate. 10, and the piston rod 5
b penetrates the fixed plate 10 and projects upward.

On the other hand, a shock absorber 6.
6, and the upper end of each shock absorber 6 is connected to the lifting plate 1.
1, and each shock absorber 6
The lower end of the hydraulic cylinder 5 is connected and fixed to the tip of the piston rod 5b of the corresponding hydraulic cylinder 5.

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 pawls 12a and 15a are provided on each side of the end plate 1215 in an annular shape to tightly engage the ends of the bellows 13, respectively.

When installing this shock absorber 6, attach the end plates 12.15 to the upper and lower l1IEil ends of the bellows 13 (7), and fix the upper end plate 12 to the lower surface of the lifting plate 11 with bolts and nuts (not shown). In addition, the lower end plate 15 is connected and fixed to a circular connecting plate 16 fixed to the tip of the piston rod 5b of the hydraulic cylinder 5 with bolts and nuts 17, and the lower end plate 15 and the connecting plate 16 are fixed in an upright manner. The plurality of guide rods 18 are inserted through the fixed plate 10 through the guide sleeves 19, respectively.

Although not shown, an air circulation pipe is connected to the air circulation hole f-L provided on the upper end plate 12 side of the shock absorber 6, and an air supply port and an exhaust port provided on this air circulation pipe are connected. Connect the air hose from the compressor to
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 exciter 3 from propagating to the hydraulic cylinder 5.

The inner tube 4 has a cylindrical shape, and the upper end of the inner tube 4 is fixed to the center of the lower surface of the elevating plate 11, and the portion extending downward from the upper end of the inner tube 4 is clearly shown in FIG. It is made to hang down into the short pipe 8 and the outer cylinder 1 as shown in FIG.

This inner cylinder 4 receives forced vibration from the vibrator 3 through the elevating plate 11 to vibrate vertically, and also generates the above-mentioned vertical vibration due to the vertical reciprocating movement of the piston rod 5b due to the operation of the hydraulic cylinder 5. are designed to perform separate up and down movements.

When the piston rod 5b of the hydraulic cylinder 5 reaches the upper limit position of the predetermined stroke, the inner cylinder 4 and the outer cylinder 1 are in abutment engagement with each other.
A vibration transmitting means for transmitting the vibration of the exciter 3 to the outer cylinder 1 is provided.

As shown schematically in FIG. 1 and specifically shown in FIG. 4, this vibration transmitting means includes, for example, an annular locking member 20 fixedly attached to a predetermined position on the upper part of the inner cylinder 4, and an elastic ring fitted therein. 21 is provided, for example, on the inner side of the short pipe 8 so that it can abut and engage with the locking member 20 via the ring 21 when the piston rod 5b of the hydraulic cylinder 5 reaches the upper limit of a predetermined stroke. It consists of an annular stopper member 22,
When the locking member 20 collides with the stopper member 22 and is locked, the forced vibration caused by the vibrator 3 is applied to the elevating plate 1.
1 to the inner cylinder 4, and from the inner cylinder 4 through the above-mentioned transmission means, the short pipe 8 forcibly causes the outer cylinder 1 to vibrate vertically.

Therefore, when the vibration transmitting means is in the disengaged state, the vibration of the exciter 3 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 5 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 5.

Another shock absorber 7 interposed on each of the pillars 2 is
As shown in FIG. 5, the lower end of the hollow cylindrical tube 23 is fixed to the upper end of the support column 2, and
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 sheave 28 is attached on this connecting member 27 (
(See Figure 11).

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 extends upward from the upper end of the piston rod 5b of the hydraulic cylinder 5 to
A guide rod part 30 with a smaller diameter is formed, a spring receiver 31 is inserted into the threaded part at the bottom of this guide rod part 30, and the spring receiver 31 is fixed with nuts 32 and 33 screwed on both upper and lower sides of the guide rod part 30. The upper spring receiver 34, which is slidably inserted into the upper part of the rod part 30, is attached to the lifting plate 1.
1, the upper spring receiver 34 and the lower spring receiver 31 are connected by an inner coil spring 35 and an outer coil spring 36, and a guide sleeve 37 is connected to the tip of the guide rod section 30. The shock absorber 29 is slidably inserted into the elevating plate 11 via a shock absorber 29, and the function of this shock absorber 29 is similar to that of the shock absorber 6 made of an air spring described above.

A jet nozzle 38 that penetrates the outer cylinder 1 and projects inward is fixedly installed at the lower end of the outer cylinder 1, and a jet air supply pipe 39 is installed on the outer surface of the outer cylinder 1 so that the jet air supply pipe 39 is connected to the axis of the outer cylinder 1. The lower end of this pipe 39 is connected to the jet nozzle 38.
At the same time, an air hose or the like from a compressor (not shown) is connected to the upper end of the pipe 39, so that jet air from the jet nozzle 38 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 each inner cylinder driving hydraulic cylinder 5 to raise its piston rod 5b to the upper limit position, the vibration transmitting means 20 and 22 are brought into engagement, and the vibration exciter 3 is brought into engagement.
By integrating the outer cylinder 1 and the outer cylinder 1 and operating the exciter 3, forced vibration in the vertical direction of the exciter 3 can be applied to the outer cylinder 1 and the cylinder 4.
The outer cylinder 1 and the inner cylinder 4 are made to penetrate into the ground G.

During this time, the hydraulic cylinder 5 is held at the upper limit position.

Also, at this time, the shock absorber 6 absorbs the vibrations that try to propagate from the exciter 3 to the hydraulic cylinder 5 through the lifting plate 11, so the vibrations are not transmitted to the hydraulic cylinder 5, thereby damaging the hydraulic cylinder 5. In addition, the shock absorber 7 provided in the middle of the support column 2 absorbs the vibration propagated from the vibration exciter 3 via the fixed plate 10 and the support column 2, and therefore, the mechanical vibration is suppressed during the penetration of the outer cylinder 1. There is no possibility that vibrations from machine 3 will be transmitted to the machine.

(b) After penetrating the outer cylinder 1 into the ground G to a predetermined depth,
Sand is thrown into the outer cylinder 1 from the hopper 9.

(/ra) Next, the holding of the upper limit position of the hydraulic cylinder 5 is released and the piston rod 5b is lowered to bring the vibration transmission means into a non-coupled state, thereby cutting the edge between the exciter 3 and the outer cylinder 1. To prevent vibrations from an exciter 3 from being transmitted to an outer cylinder 1.

Then, while only the inner cylinder 4 is vibrated vertically by the vibration machine 3,
The upper limit position of the stroke of the hydraulic cylinder 5 is set slightly lower than the initial position, and the piston rod 5b is raised and lowered at the set stroke to such an extent that the vibration transmitting means is not engaged, thereby causing the inner cylinder 4 to act as an exciter. The vertical movement is performed separately from the vertical vibration in step 3.

Then, the ground G around the outer cylinder 1 is protected from being stirred by the outer cylinder 1, and the sand on the upper side of the outer cylinder 1 is not tamped by the inner cylinder 4 and is pushed out from the tip of the outer cylinder 1.

In this case, since the vertical movement of the inner cylinder 4 is performed by the reciprocating movement of the piston rod 5b of the hydraulic cylinder 5, the inner cylinder 4
The vertical stroke of the can be made sufficiently long.

Therefore, the inner cylinder 4 can more fully tamp down the compacted sand in the outer cylinder 1, and can also push out a large amount of the compacted sand in the outer cylinder 1 at once, improving work efficiency. be done.

Then, while the sand in the outer cylinder 1 is being compacted with the inner cylinder 4, the outer cylinder 1 is gradually pulled out.By doing this, the sand comes out well and there is no need to worry about pulling out the outer cylinder 1. Since there is no need for this, work efficiency can be improved.

Furthermore, by injecting air from the jet nozzle 38, the sand is pushed out from the tip of the outer cylinder 1, and together with the extrusion and tamping of the inner cylinder 4, a stronger sand pile can be created quickly. .

Roughly speaking, if the outer cylinder 1 cannot be pulled out easily at first, the piston rod 5b of the hydraulic cylinder 5 is raised to the original maximum position and the vibration transmitting means is engaged. By integrating the vibration exciter 3 and transmitting vibrations 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 doors), adjust the upper limit position of the hydraulic cylinder 5 slightly lower again and cut the edge between the outer cylinder 1 and the vibration machine 3. The outer cylinder 1 is pulled out while compacting the sand with the inner cylinder 4.

In addition, the vibration transmission means should be kept in a stable state (i.e.,
When the inner cylinder 4 is reciprocated up and down by the hydraulic cylinder 5 (in a state where the outer cylinder 1 and the edger 3 are not integrated), the upper limit position of the hydraulic cylinder 5 can be adjusted using an appropriate hydraulic control device that operates the hydraulic cylinder 5. (not shown).

) As described above, strong sand piles are constructed on the soft ground G.

As is clear from the description of the embodiments above, in the sand pile construction device of the present invention, the lower end of the exciter and the lower end of the outer cylinder are connected via a shock absorber to a plurality of hydraulic cylinders for driving the inner cylinder. Therefore, the inner cylinder can be moved up and down with a long stroke using a long stroke hydraulic cylinder, which makes it possible to compact the compacted sand in the outer cylinder even more strongly. It is possible to extrude a large amount of sand at once, and therefore a strong sand pile can be obtained, and the workability of the sand pile construction work can be improved.

In addition, a shock absorber is installed on the exciter side, and this shock absorber is connected to the hydraulic cylinder, so the forced vibration of the exciter is absorbed by the shock absorber and is not transmitted to the hydraulic cylinder. Therefore, there is no risk of damage to the hydraulic cylinder or loss of operability.

[Brief explanation of drawings]

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
Fig. 3 is an enlarged longitudinal sectional view of the shock absorber connected to the hydraulic cylinder, Fig. 4 is a cross-sectional explanatory view showing the vibration transmission means, and Fig. 5 is an enlarged cross-sectional view of the shock absorber connected to the hydraulic cylinder. An enlarged vertical cross-sectional view of the shock absorber; FIG. 6 is an enlarged vertical cross-sectional view showing another example of the shock absorber shown in FIG. 3;
Figures 7A, 7B, 7C and 7B are explanatory diagrams showing the construction work of the sand pile making device. 1...Outer tube, 2...Strut, 3...
... Exciter, 4 ... Inner cylinder, 5 ... Hydraulic cylinder for driving the inner cylinder, 5a ... Cylinder case, 5b ... Piston rod, 6...Shock absorber, 9...Sand charging hopper,
10... Fixed plate, 11... Lifting plate.

Claims (1)

[Claims] 1 A hopper for feeding sand is provided at the upper end of the outer cylinder, and
A support is erected above the upper end of this outer cylinder, and an exciter is installed on this support so as to be able to rise and fall freely.The upper end of the inner cylinder inserted into the outer cylinder is fixed to the lower end of this exciter. The lower end of the exciter and the upper end of the outer cylinder are connected by a plurality of hydraulic cylinders via shock absorbers respectively disposed on the exciter side, and the actuation of the hydraulic cylinders causes the exciter and the inner cylinder to be connected. A sand pile creation device configured to move up and down.