JPH01226917A - Preparation device for gravel pile - Google Patents

Abstract

PURPOSE:To prepare a firm gravel pile in a short time by interposing a relay tank between a hopper for supply gravel and a casing while installing a vibrator to a support lever in the casing. CONSTITUTION:In a gravel-pile preparation device, a relay tank 10 capable of housing gravel in capacity corresponding to at least one casing 8 is interposed between a hopper 9 for supplying gravel and a fixing casing 8. A support lever 13 is inserted downward into the casing 8, and a vibrator 14 is mounted at the lower end section of the support lever 13. The support lever 13 is moved vertically by a fluid cylinder, and the inside of the relay tank 10 is supplied with compressed air from a nozzle for a compressed-air supply means 12 in the upper section of the relay tank. Accordingly, a firm gravel pile P can be formed.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention involves inserting into the ground a casing that is connected downwardly to a hopper for supplying gravel, and collecting gravel such as sand and gravel from the hopper into the casing. It relates to a device that creates gravel piles (columnar bodies of sand, gravel, etc.) in the ground by charging and filling the filled gravel with pressurized air supplied from above and pulling out the casing.

(Prior art) This type of conventional gravel pile construction equipment connects the upper end of the casing directly to the chute provided at the bottom of the gravel input hopper. The gravel is driven into the casing by a shaker or by rotating it using a casing with a screw, and after the casing reaches a predetermined depth, the required amount of gravel is filled into the casing from a hopper. After this filling, compressed air is supplied to the upper part of the casing to press the gravel inside the casing and pull out the casing, thereby creating a gravel pile for the casing/main in the ground B.

(Problems to be Solved by the Invention) In the conventional equipment as described above, each casing/load of gravel is filled into the casing from the hopper every time seven gravel piles are constructed, and the gravel Because other work will be interrupted during filling, if a large number of gravel piles are built in succession in adjacent positions, the time required to build each gravel pile will be considerably longer. It was inefficient.

In view of the above, the present invention is aimed at reducing the time required to create gravel piles/piles by supplying -degree gravel so that at least two gravel piles can be constructed continuously without interrupting the work. Another object of the present invention is to provide a gravel pile construction device that can prevent gravel from leaking out from the lower end of the casing when the casing filled with gravel is lifted above the ground, and also prevent gravel from leaking into the ground. The object of the present invention is to provide a device that can sufficiently compact gravel discharged from a casing to create a strong gravel pile.

(Means for Solving the Problem) In order to achieve the above object, C in the present invention provides a relay tank that can accommodate at least the capacity of gravel per casing between the gravel supply hopper and the casing. A support rod is inserted into the casing and a pie break is installed at the lower end of the support rod, and the vibrator is normally held within the lower end of the fixed casing. A fluid pressure cylinder for vertically moving the support rod is interposed so as to protrude from the lower end, and a pressure air supply means for supplying pressurized air into the relay tank is provided in the upper part of the relay tank.

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

Figure 1 shows a gravel pile making device. In this figure, 1 is a machine frame that is suspended from a leader (not shown) installed upright, such as a crawler crane, so that it can be raised and lowered freely. is equipped with a rotary casing 3 which is rotatably hung down and has a screw 2 screwed on its outer circumferential surface, and this rotary casing 3
gear 5. is fixed to the output shaft of the drive motor 4, 4.
5 meshes with a gear 6 fixed to the upper end of the rotating casing 3 and rotates it, thereby driving the rotating casing 3. A shoe (bottom cover) 7 is provided at the lower end of the rotating casing 3. It is attached so that it can be opened and closed freely. A fixed casing 8 is fitted into the rotating casing 3, and a required upper end portion of the fixed casing 8 is fixed to the machine frame 1. Reference numeral 9 denotes a gravel supply hopper, and a chute 9a is protruded from the lower part of the hopper at a position directly above the fixed casing 8.

A large-diameter cylindrical relay tank 10 is interposed between the seat 9a of the gravel supply hopper 9 and the fixed casing 8, and can accommodate enough gravel for 87 fixed casings. An on-off valve 11 for opening and closing the inlet opening of the chute 9a is provided in the chute 9a, and is also a means for supplying pressurized air into the relay tank 10, and at the same time, the on-off valve 11 is opened and closed by the injected air pressure. An air supply nozzle 12 is provided, which is pressed to close the valve. Note that the on-off valve 11 is normally closed by the chute 9 due to its own weight.
It is held in a position where the inlet opening of a is fully opened.

A hollow support rod 13 is inserted to hang down from the inside of the relay tank 10 to the inside of the fixed casing 8, and this support rod 1
The lower end of 3 is equipped with a vibrofront 14 as a vibrator, and the upper end is connected to a piston rod 15a of a fluid pressure cylinder 15 made of, for example, a hydraulic cylinder, and this fluid pressure cylinder 15 is attached to the upper end of the relay tank 10. The mounting is fixed to the attached bracket 16. Incidentally, this bracket 16 has a structure that allows gravel from the chute 9a side to freely flow and fall to the relay tank 10 side. Further, the upper end side of the fluid pressure cylinder 15 and the support rod 13 connected thereto is protected by a protection tube 17 suspended by the bracket 16.

As shown in FIG. 2, the vibroplot 14 has an electric motor 19 disposed within a cylindrical front body 18 having a diameter sufficiently larger than that of the support rod 13, and an eccentric shaft body 20 connected to the output shaft of the electric motor 19. The front main body 18 is designed to vibrate in the lateral direction due to the eccentric rotation of the eccentric shaft body 20 caused by the rotation of the electric motor 19. The camping tire 21 for the electric motor 19 is the support rod 1
The support rod 13 passes through the hollow part of the support rod 13 and is inserted into the protection tube 17 at the upper end thereof, and is appropriately extended to the outside from there. When constructing a gravel pile, this Vibrofron [4 is located at a position where it protrudes downward from the lower end of the fixed casing 8 and is pulled out from the fixed casing 8, as shown by the imaginary line in FIG. The vibrations compact the gravel that is pushed out from the bottom. Furthermore, when the fixed casing 8 is pulled up to the ground together with the rotating casing 3, by contracting the hydraulic cylinder 15, the vibrofront 14 is moved to the position shown by the solid line in FIG. This prevents the gravel filled in the fixed casing 8 from leaking from the lower end of the casing 8.

Next, use the device configured as described above to measure the soft ground W.
The first vj is the process of creating gravel piles inside! J and 3rd
This will be explained according to Figures A to E.

At the start of the gravel pile construction work, the on-off valve 11 is open and the vibrofront 14 is retracted into the fixed casing 8, as shown in FIG. The gravel is introduced from the gravel supply hopper 9 and is filled into the fixed casing 8 and the relay tank 10. The level of gravel G in the relay tank 10 at this time is indicated by L1 in the figure, and the level of gravel G in the relay tank 10 from this Ll to L2 below it (Fig. 1)
It is assumed that the capacity of the pile corresponds to the capacity of the gravel pile constructed in the ground W.

In this way, from the state filled with gravel G, the rotating casing 3 is rotated and penetrates into the ground W as shown in FIG. When it reaches a predetermined depth, its rotation is stopped and the supply of pressurized air is started from the air supply nozzle 12. At this time, the on-off valve 11 is operated to the closed position by the air pressure jetted from the nozzle 12. This increases the air pressure in the upper space within the relay tank 10. While pressurizing the gravel G in the relay tank 10 with the increased air pressure, the rotating casing 6 is moved as shown in FIG. 3C.
is rotated in the opposite direction to start lifting, and at the same time, the fluid pressure cylinder 15 is extended to cause the vibroflon eye 4 to protrude downward from the lower end of the fixed casing, and at the same time, the vibrofloat 7 is also vibrated. In this way, as the rotating casing 6 is pulled up, the gravel G pressurized from the lower end of the fixed casing 3 is extruded and a gravel pile P is created in the ground W. In this case, the extruded gravel G is at the vibrofront. A consolidated and strong gravel pile P is formed to receive the photographing operation of 14. Further, as is clear from FIG. 3C, as the gravel G is discharged from the fixed casing 3 into the ground 1w, the level of the gravel G in the relay tank IO decreases. Then, by raising the rotating casing 6 above the ground as shown in the third diagram, an amount of gravel corresponding to the capacity of the fixed casing 3, that is, the capacity between the levels Lt and L in the relay tank 10 is generated. A pile P is created.

When the rotating casing 6 is pulled up to the ground, the supply of pressurized air is stopped, and the vibrofront 14
into the lower end of the fixed casing 3 as shown. By drawing this vibrofront 14 into the fixed casing 3, the opening area at the lower end of the fixed casing 3 is narrowed, and leakage of gravel G from the lower end of the fixed casing 3 can be actively prevented.

After completing the creation of the first gravel pile P in this way, the device is moved to another location, where the above series of operations are performed again to create the second gravel pile.
During the land reclamation work at this other location, as shown in Figure 3, the fixed casing 3 is still filled with gravel for gravel piles/mains, so the reclamation work can be connected without particularly supplying gravel. It can be done by Therefore, it is sufficient to supply gravel as appropriate until the construction of the third gravel pile begins.

In this example, the relay tank was used to accommodate the gravel equivalent to one fixed casing, but if a relay tank is provided that can accommodate the gravel equivalent to 5 to 6 casings, 5 to 6 gravel can be stored without replenishing the gravel. Gravel piles can be constructed continuously and effectively.

In addition, in the embodiment, a casing with a screw is used and the rotating casing is rotated and inserted into the ground together with a fixed casing, but by using an exciter instead of such a double casing, a single casing can be inserted into the ground. The driving may be performed while applying vertical vibration to the casing (fixed casing), and the present invention can be applied in either case.

(Effects of the Invention) According to the present invention, a relay tank capable of accommodating at least one casing's worth of gravel is interposed between the gravel supply hopper and the casing. It is no longer necessary to supply and fill gravel every time a gravel pile/book is created, and by supplying gravel at least two times, it is possible to continuously install at least two gravel piles without interrupting the work. This has the effect of shortening the time required to create gravel/trucks. In addition, in the present invention, a support rod is inserted into the casing in a hanging manner and a pie break is provided at the lower end of the support rod, and a vibrator is normally held in the lower end of the fixed casing, and the support rod is provided with a pie break at the lower end of the support rod. A hydraulic cylinder is installed to move the supporting rod up and down so that it protrudes from the lower end of the fixed casing when discharging gravel. Even if the casing is moved appropriately, the lower end of the casing is blocked by the vibrator inside the lower end of the casing, which prevents the gravel from leaking out, and prevents the gravel from being extruded from the lower end of the casing in the ground B. It has the effect of giving vibration to the gravel and compacting it sufficiently, thereby forming a strong gravel pile.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a gravel pile construction device showing an embodiment of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of a vibrofront, and Fig. 3 A-E are construction steps for gravel pile construction using the surface 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... Opening/closing valve,
12... Air supply nozzle (pressure air supply means), 13
... Support rod, 14... Vibrofront (vibrator), 15... Fluid pressure cylinder.

Claims (1)

[Claims] A casing connected to the bottom of the gravel supply hopper is inserted into the ground, and the casing is filled with gravel such as sand and gravel from the hopper, and the filled gravel is pressed with pressurized air from above. In a gravel pile construction device that creates a gravel pile in the ground by pulling out a casing while doing so, a relay tank capable of accommodating gravel with a capacity of at least one casing is interposed between the hopper and the casing, A support rod is inserted into the casing and a vibrator is installed at the lower end of the support rod, and the vibrator is normally held within the lower end of the fixed casing and protrudes from the lower end of the fixed casing when gravel is discharged. a hydraulic cylinder for moving the support rod up and down so as to move the support rod up and down, and a pressure air supply means for supplying pressurized air into the relay tank is provided in the upper part of the relay tank. Pile building equipment.