JPH0645931B2 - Gravel pile construction equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a gravel gravel from a hopper which is inserted into the ground by inserting a casing that is hung downward from a gravel supply hopper into the ground. The present invention relates to a device for forming gravel piles (columnar bodies such as sand and gravel) in the ground by charging and filling the gravel and pressing the filled gravel with pressurized air supplied from above to pull out the casing.

(Prior Art) This type of conventional gravel pile forming device is one in which the upper end of the casing is directly connected to the chute provided in the lower part of the gravel input hopper. When forming the gravel pile, the casing is excited. It is driven by a machine, or is pierced while rotating it using a casing with a screw, and after the casing reaches a predetermined depth, the gravel is filled from the hopper into the casing in the required amount. After the filling, pressure air is supplied to the upper portion of the casing to pull out the casing while pressing the gravel in the casing, thereby forming a gravel pile for one casing in the ground.

(Problems to be Solved by the Invention) In the conventional device as described above, the gravel for one casing is filled from the hopper into the casing every time one gravel pile is formed. Since other work will be interrupted during filling, the time required for the construction of gravel piles per one will be considerably long when a large number of gravel piles are successively constructed at adjacent positions. It was inefficient.

In view of the above, the present invention allows at least two gravel piles to be continuously supplied without interrupting the work once the gravel is supplied, and the time required for construction per gravel pile can be shortened. It is an object of the present invention to provide a gravel pile forming device, and further, the present invention prevents the gravel from leaking from the lower end of the casing when the casing filled with the gravel is pulled up to the ground,
An object of the present invention is to provide a device capable of constructing a strong gravel pile by sufficiently compacting the gravel discharged from the casing in the ground.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, at least a casing formed between the gravel supply hopper and the casing in a shape concentric with the casing and expanding in diameter with respect to the casing. A relay tank capable of accommodating a gravel of one volume is provided, and a supporting rod is penetratingly inserted into the casing and a vibrator is provided at a lower end portion thereof. The supporting rod is provided with the vibrator at all times. The relay tank is connected to a fluid pressure cylinder for vertically moving the support rod by a predetermined stroke so that the support rod is held in the lower end portion of the casing to close the lower end portion and protrude from the lower end portion of the casing when the gravel is discharged. A pressure air supply means for supplying pressure air to the inside of the relay tank is provided in the upper part of the.

(Example) An example will be described with reference to the drawings.

FIG. 1 shows a gravel pile forming device. In this figure, 1 is a machine frame that can be lifted and lowered by a leader (not shown) installed upright on a crawler crane or the like. Is equipped with a rotary casing 3 having a screw 2 on its outer peripheral surface so as to be freely rotatable.

The rotary casing 3 is driven by gears 5 and 5 fixed to the output shafts of the drive motors 4 and 4 meshing with a gear 6 fixed to the upper end of the rotary casing 3 and rotating the gear 6. It is like this. A shoe (bottom lid) 7 is attached to the lower end of the rotating casing 3 so as to be openable and closable.

Reference numeral 8 denotes a cylindrical fixed casing fitted and inserted in the rotary casing 3, and a required upper end portion thereof is fixed to the machine frame 1. Reference numeral 9 denotes a gravel supply hopper, and a chute 9a is provided at a lower portion of the hopper at a position directly above the fixed casing 8.

Between the chute 9a of the gravel supply hopper 9 and the fixed casing 8, there is provided a relay tank 10 capable of sufficiently storing the gravel having a capacity of 81 fixed casings. The relay tank 10 is formed in a cylindrical shape having a large diameter so as to be concentric with the fixed casing 8 and to expand its diameter with respect to the fixed casing 8. The lower end portion of the relay tank 10 is formed in a funnel shape. And is connected to the upper end of the fixed casing 8.

Further, an opening / closing valve 11 for opening / closing the inlet opening of the chute 9a is provided in the chute 9a, and the relay tank 10 is further provided.
At the same time as the means for supplying pressurized air, there is provided an air supply nozzle 12 for pushing and closing the on-off valve 11 by the injection air pressure. The on-off valve 11 is normally held at a position where the inlet opening of the chute 9a is fully opened by its own weight.

A hollow support rod 13 is suspended from the inside of the relay tank 10 to the inside of the fixed casing 8. This support rod
Vibro flot 14 is equipped at the lower end of 13,
Further, the upper end of the support rod 13 always holds the vibe flot 14 in the lower end of the fixed casing 8 to close the lower end as shown by the solid line in FIG. 1, and when the gravel G is discharged, as shown in FIG. As shown by phantom lines, the support rod 13 is interlockingly connected to a piston rod 15a of a fluid pressure cylinder 15 such as a hydraulic cylinder for vertically moving the support rod 13 by a predetermined stroke so as to project from the lower end of the fixed casing 8.

The fluid pressure cylinder 15 is attached and fixed to a bracket 16 attached to the upper end of the relay tank 10. The bracket 16 has a structure that allows the gravel from the chute 9a side to freely flow and drop to the relay tank 10 side. In addition, the fluid pressure cylinder 15 and the support rod connected to the fluid pressure cylinder 15.
The upper end side of 13 is a protection tube 17 suspended from the above bracket 16.
Protected by.

As shown in FIG. 2, the vibro-blot 14 has an electric motor inside a cylindrical flot body 18 having a diameter sufficiently larger than that of the supporting rod 13.
The eccentric shaft body 20 connected to the output shaft of the electric motor 19 is mounted on the shaft, and the eccentric shaft body 20 is eccentrically rotated by the rotation of the electric motor 19. Is created. Electric motor 19
A cap tire (21) for a vehicle is hung down through the hollow portion of the support rod (13), extends into the protective tube (17) at the upper end of the support rod (13), and appropriately extends to the outside from there.

When the gravel pile is constructed, the vibro flot 14 is located at a position projecting downward from the lower end of the fixed casing 8 and coming out of the fixed casing 8 as shown by the phantom line in FIG. 8 The gravel extruded from the lower end is compacted by vibration. When the fixed casing 8 is pulled up to the ground together with the rotary casing 3, the vibrating cylinder 15 is contracted to move the vibroflot 14 to the position shown by the solid line in FIG. 1, that is, in the lower end portion of the fixed casing 8. It is possible to prevent the gravel filled in the fixed casing 8 from leaking out from the lower end of the fixed casing 8 by being located at.

Next, using the device having the above-mentioned configuration, the soft ground W
Fig. 1 and Fig. 3A to Fig. 3 show a process of forming a gravel pile inside.
Follow E.

At the start of the gravel pile construction work, as shown in FIG. 3A, the on-off valve 11 is in the open state, the vibro flot 14 is in the state of being retracted into the fixed casing 8,
Then, under such a state, the gravel G is fed from the gravel supply hopper 9 to fill the fixed casing 8 and the relay tank 10. The level of the gravel G in the relay tank 10 at this time is indicated by L ₁ in the figure, and the capacity of the gravel G between L ₁ and L ₀ (FIG. 1) below the gravel is formed in the ground W. Equivalent to the amount of one gravel pile.

From the state where the gravel G is filled in this way, the rotary casing 3 is rotated to penetrate into the ground W as shown in FIG. 3B. At this time, the shoe 7 is closed as shown in FIG. Then, when the rotary casing 3 reaches a predetermined depth, its rotation is stopped and the air supply nozzle 12
The supply of pressurized air is further started, and at this time the opening / closing valve 11 is operated to the closed position by the air pressure injected from the nozzle 12, thereby raising the air pressure in the upper space in the relay tank 10.

While pressurizing the gravel G in the relay tank 10 by the air pressure thus increased, the rotary casing 3 is rotated in the opposite direction to start pulling up and the fluid pressure cylinder 15 is extended as shown in FIG. 3C. The vibro flot 14 is caused to protrude downward from the lower end of the fixed casing 8 and at the same time the vibro flot 14 is vibrated again. In this way, the gravel G which is pressurized is pushed out from the lower end of the fixed casing 8 in association with the pulling up operation of the rotary casing 3 to form the gravel pile P in the ground W. In this case, the gravel G extruded from the fixed casing 8 is the vibro flot 14
Gravel pile P that has been consolidated due to the vibration of
Will be formed.

Further, as is clear with reference to FIG. 3C, as the gravel G is discharged from the fixed casing 8 into the ground W,
The level of the gravel G of the relay tank 10 is lowered. And
By pulling up the rotating casing 3 to the ground as shown in FIG. 3D, the capacity of one fixed casing 8,
That is, the gravel pile P having an amount corresponding to the capacity between the levels L ₁ and L ₀ in the relay tank 10 is created. When the rotary casing 3 is pulled up to the ground, the supply of pressure air is stopped and the fluid pressure cylinder 15 is contracted to draw the vibro flot 14 into the lower end portion of the fixed casing 8 as shown in the drawing. By pulling the vibro flot 14 into the fixed casing 8 in this manner, the opening area at the lower end of the fixed casing 8 is narrowed, and the fixed casing 8 is closed.
It is possible to prevent the gravel G from leaking from the lower end.

After the construction of the first gravel pile P is completed in this way, the device is moved to another location, and the series of operations described above is performed there again to construct the second gravel pile.
In the construction work at this other place, as shown in FIG. 3E, since the gravel G for one gravel pile is still packed in the fixed casing 8, the gravel G is especially used.
It is possible to continuously perform the construction work without supplying the above. Therefore, the supply of the gravel G may be appropriately performed before the construction of the third gravel pile is started.

In the embodiment described above, the relay tank that can accommodate the gravel for one fixed casing is used.
If a relay tank capable of accommodating 6 gravels is provided, it is possible to effectively construct 5 to 6 gravel piles continuously without supplying gravel.

Further, in the embodiment, a casing with a screw is used, and the rotating casing is inserted into the ground together with the fixed casing while rotating. The casing (fixed casing) may be driven while being vertically vibrated, and in any case, the present invention can be applied.

(Effect of the Invention) According to the present invention, since a relay tank capable of accommodating at least one casing of the gravel is provided between the gravel supply hopper and the casing, as in the conventional device. It is no longer necessary to supply and fill gravel every time one gravel pile is created, and once gravel is supplied, at least two gravel piles can be continuously performed without interruption of work. This has the effect of shortening the time required to create one gravel.

Further, in the present invention, since the relay tank is formed in a shape that is concentric with the casing and expands in diameter with respect to the casing,
When the gravel is stored in this relay tank during construction work, the center of gravity of the gravel stored in the relay tank can always be made to act on the central axis of the casing, and the length of the tank can be kept relatively small. Since it can be shortened, its center of gravity can be applied to a relatively low position. Therefore, if the casing is guided vertically up and down by a leader, etc., there is no risk of the casing tilting or falling due to the load on the relay tank side, and the entire device will always be in a stable state, obstructing the driving and raising of the casing. There is an effect that the work safety can be ensured in addition to the above.

Further, according to the present invention, a supporting rod is hung down in the casing and a vibrator is provided at the lower end portion thereof, and the supporting rod keeps the vibrator always in the lower end portion of the fixed casing and discharges the gravel. Sometimes it is linked to a fluid pressure cylinder for moving the support rod up and down so that it projects from the lower end of the fixed casing, so while the casing is filled with gravel, this casing can be pulled up to the ground or moved appropriately on the ground. Even if it is done, the inside of the lower end of the casing is closed by the vibrator inside the lower end of the casing, and the gravel can be prevented from leaking out, whereby the construction of a plurality of gravel piles can be continuously and efficiently performed. At the same time, when each gravel is constructed, it is discharged when the gravel is pushed out from the lower end of the casing in the ground and discharged. To the gravel giving vibrations can be hardened sufficiently tighten the effect of thereby form a strong gravel pile.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a gravel pile forming apparatus showing an embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view of a vibro flot, and FIGS. 3A to 3E are construction steps of a gravel pile forming apparatus of the present invention. FIG. DESCRIPTION OF SYMBOLS 1 ... Machine frame, 3 ... Rotating casing, 7 ... Shoe, 8 ... Fixed casing, 9 ... Gravel supply hopper, 10 ... Relay tank, 11 ... Open / close valve, 12 ... Air supply nozzle (pressure air supply means), 13 ... Support rod, 14 ... Vibro Flot (vibrator), 15 ... Fluid pressure cylinder.

Claims (1)

[Claims] 1. A casing, which is provided so as to hang down below a gravel supply hopper, is inserted into the ground, sand, gravel and the like gravel from the hopper is filled in the casing, and the filled gravel is fed from above. In a gravel pile forming apparatus for forming a gravel pile in the ground by pulling out the casing while pressing it with compressed air, between the hopper and the casing, a shape concentric with the casing and expanding to the casing is formed. A relay tank capable of accommodating at least one casing of gravel is interposed, a supporting rod is hung and inserted into the casing, and a vibrator is provided at a lower end portion thereof, and the supporting rod is provided with the vibrator. Is always held in the lower end of the casing to close the lower end, and the lower end of the casing is discharged when the gravel is discharged. The support rod is linked to a fluid pressure cylinder for moving up and down by a predetermined stroke so as to project from above, and pressure air supply means for supplying pressure air into the relay tank is provided above the relay tank. A gravel pile construction device characterized by the above.