JPH0366822A - Sand pile forming device - Google Patents

Abstract

PURPOSE:To promote the formation of a sand pile by disposing a sand tank which can store a volume of sand, at least, equal to that of a casing, between a hopper and the casing, and by providing a shut-off valve in an opening in the bottom section of the sand tank while arranging a pressure supply means below the shut-off valve. CONSTITUTION:A sand tank 5 which can store a volume of sand substantially equal to that of a stationary casing is provided on a frame 1, and is connected thereto with a sand supply hopper 6. A shut-off valve 15 is disposed in a sand discharge opening 12 in the tank 5, and an air supply pipe 12 is projected into a communication passage 13. Then, the valve 15 is opened so as to fill sand in the casing 4 and the tank 5 through the hopper 6. When a rotary casing 2 is intruded up to a predetermined depth, air is supplied through the pipe 12 so as to pressurize the sand in the casing 4. Further, the lower end face of the casing 4 is opened while the rotary casing 2 is pulled out, and a vibroflot 9 is vibrated while air is jetted from an air jet supply pipe 27 so as to form a sand pile. Accordingly, it is possible to shorten the time required for the formation of the sand pile.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention involves inserting a casing suspended below a sand supply hopper into the ground, and discharging sand from the hopper into the casing. This invention relates to a sand pile construction device that creates sand, gravel, crushed stone, etc. (hereinafter simply referred to as sand) piles in the ground by pulling out a casing while pressing with pressurized air.

(Prior art) This type of sand pile construction equipment in the past is constructed by directly connecting the upper end of the casing to a chute provided at the bottom of the sand supply hopper. Either by drilling with a machine or by rotating the casing using a rotary casing, and after the casing reaches a predetermined depth, the required amount of sand is filled into the casing from a hopper, and after this filling. By supplying pressurized air to the upper part of the casing and pulling out the casing while pressing the gravel inside the casing, the casing 1 is placed in the ground.
My duty is to create sand piles.

(Issue 8 to be solved by the invention) In the conventional device as described above, sand equivalent to one casing is filled from the hopper into the casing every time one sand pile is constructed. Because other work will be interrupted while the sand is being filled, the time required to build each sand pile will be considerably longer if a large number of sand piles are built one after another in adjacent locations. Construction efficiency was poor.

In view of the above, the present invention makes it possible to construct at least two sand piles continuously without interrupting the work by supplying -degree sand, thereby shortening the time required to construct each sand pile. The purpose is to provide a sand pile construction device that can

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a sand tank capable of storing sand with a capacity of at least one casing is interposed between the sand supply hopper and the casing. death,
A sand discharge opening communicating with the casing is provided at the bottom of the sand tank, and an on-off valve is provided in this opening, and an air supply means for supplying pressurized air into the casing is provided below the on-off valve. It was established.

(Example) An example will be explained with reference to the drawings. Fig. 1 shows a sand pile construction device, and in this figure, 1 is a machine installed on a crawler crane or the like or raised and lowered by a crane (not shown). A cylindrical rotary casing 2 is rotatably suspended from the lower part of the machine frame 1, and the rotary casing 2 is connected to a pair of electric motors 3. 3
and a gear transmission mechanism (not shown).

A cylindrical fixed casing 4 is inserted concentrically into the rotary casing 2, and its lower end extends to near the lower end of the rotary casing 2, and its upper end extends toward the upper part of the machine frame 1. 5 is a large-diameter cylindrical sand tank installed concentrically with the fixed casing 2 on the upper part of the machine frame 1, and is formed in a size that can sufficiently accommodate the capacity of four fixed casings. A sand supply hopper 6 is connected to the upper end of the sand tank 5. Reference numeral 7 denotes a hollow inner rod inserted concentrically into the fixed casing 4, the upper end of which is interlocked and connected to a hydraulic cylinder 8 serving as a vertical drive means, and the lower end thereof protruding from the lower end of the fixed casing 4. , a vibrator rod 9 as a pie break is attached to its protruding end.

Reference numeral 1o designates an excavating blade disposed at the lower end of the rotary casing 2 so as to protrude downward and inward.

A protection pipe 11 for protecting the hydraulic cylinder 8 is provided in the sand tank 5, and the upper end thereof is fixed to the earthen wall of the sand tank 5. The lower end portion passes through the mortar-shaped bottom wall portion 5a of the sand tank 5 and is connected to the upper end portion of the fixed casing 4 in communication. A sand discharge opening 12 is provided in the bottom wall 15a of the sand tank 5, and this opening 12 is connected to the bottom wall 5a.
It communicates with the upper end of the fixed casing 4 through an inclined communication passage 13 formed below, and the outer opening of the twenty-way passage 13 is closed by a blind flange 14.

The sand discharge opening 12 is provided with an on-off valve 1-5,
The on-off valve 15 includes a valve plate 16 which is pivotally mounted on the lower surface of the bottom wall 5a of the sand tank 5 and opens and closes the sand discharge opening 12 from the lower surface thereof, and a valve plate 16 installed on the outer surface of the side wall 5b of the sand tank 5. Fluid pressure cylinder 17 (for example, air cylinder) for driving the valve plate
and a wire 18 that interlocks and connects the valve plate 16 and the fluid pressure cylinder 17, and a slider 19 connected to the tip of the piston rod 17a of the fluid pressure cylinder 17 is fixed to the sand tank side wall 5b. One end of the wire 18, whose intermediate portion is supported by a sheep 22, is fixed to the slider 19, and the other end is fixed to the valve plate 16. As shown in FIG. 1, when the piston rod 17a contracts, the valve plate 16 is in the open position, and the piston rod 17
When a extends downward, the valve plate 1 is connected via the wire 18.
6 rotates upward to close the sand discharge opening 12. An air supply pipe 21 as an air supply means is protruded into the communication path 13, and this pipe 2
1 allows pressurized air to flow from the communication path 13 to the fixed casing 4.
supplied within.

The fluid pressure cylinder 8 for vertically driving the inner rod is, for example, a hydraulic cylinder, and the upper end of the cylinder body is attached to the earthen wall of the sand tank 5, and the tip of the piston rod 8a is attached to the inner rod 7. Connected to the top end. When the piston rod 8a of the fluid pressure cylinder 8 contracts upward and the inner rod 7 reaches its upper limit position, the vibrofront 9 attached to the lower end of the inner rod 7 is moved along the dashed-dotted line in FIG. As shown in the figure, the upper end portion is located at the lower end portion of the fixed casing 4 and closes the lower end opening, and the piston rod 8a
When the inner rod 7 extends downward and moves downward, it separates downward from the lower end portion of the fixed casing 4 and opens its lower end opening. At the lower limit position of the inner rod 7, the vibrofront 9 is in the position shown by the solid line in FIG.

The excavating blade 10 is fixed to the respective lower ends of a pair of mounting frames 23, 23 on both sides that are fixed to diametrically opposed positions on the outer peripheral surface of the lower end of the rotary casing 2 and protrude downward. As is clear from FIGS. 1 and 2, each excavation blade 10 has a cutting edge IOa at its lower end, and this canting edge 10a has an outer end located outside the outer peripheral surface position of the rotating casing 2. It protrudes so that its inner end protrudes sufficiently inward from the position of the inner circumferential surface of the fixed casing 4, and crosses both casings 2 and 4 in the inner and outer directions from its outer end to its inner end. It is extending. Further, each excavating blade 1o has an entire side surface of, for example, 30'' with respect to a vertical plane passing through the central axis of the rotating casing 2.
It has an inclination of ~40 degrees, and is arranged so that the inner end side is tilted, for example, 20'' to 30'' toward the rotation direction side of the rotating casing 2.

A reinforcing frame piece 24 is interposed between the lower end of each mounting frame 23 and the excavating blade 10. Further, a reinforcing excavating piece 25 is attached to the lower end of the rotating casing 2 at a circumferentially intermediate position between both excavating blades 10. Furthermore, it has a crushing function and also has the role of a balance weight that balances the excavation blade 10.

The rotating casing 2 has a large number of holes 20 for discharging soil, and the fixed casing 4 has an air jet supplying vibrator 27 piped inside the fixed casing 4 to eject an air jet from the lower end of the fixed casing 4.

Although not shown, the vibrofront 9 has a built-in electric motor and an eccentric shaft connected to its output shaft, and generates lateral vibration by eccentric rotation of the eccentric shaft due to rotation of the electric motor. It looks like this. This cap tire for the electric motor is inserted into the inside of the inner rod 7 and extends to the outside from a suitable location on the upper part of the inner rod 7. When the vibrofront 9 penetrates the casing, it is in the position shown by the dashed line in FIG. 1 due to the rise of the inner rod 7, and is in an inactive state. When the casing is pulled out, the inner rod 7 is lowered to the position shown by the solid line in the same figure, and the fixed casing 4 is
The lower end surface is open, and the vibration effect is performed at this position.

Next, a method for constructing sand piles in soft ground using the apparatus configured as described above will be explained.

To start the sand piling work, first open the on-off valve 15 and fill the fixed casing 4 with sand supplied from the hopper 6 into the sand tank 5 through the communication path 13 from the sand discharge opening 12. do.

Of course, at this time, the inner rod 7 is at the upper limit position, and the lower end of the fixed casing 4 is closed by the vibrofront 9. Once the required amount of sand has been filled into the fixed casing 4 (the amount of sand filled is determined using a well-known weight-type sand surface detection device installed inside the fixed casing 4), the on-off valve 15 is closed, and the pumper 6 is then Then, sand is supplied to fill the sand tank 5 with sand equivalent to about four fixed casings (this amount of filling is determined by a weight-type sand surface detection device provided in the sand tank 5).

In this way, from the state in which the fixed casing 4 and the sand tank 5 are each filled with the required amount of sand, the rotary casing 2 is driven to rotate and penetrates into the ground together with the fixed casing 4. In this casing penetration operation, the digging blade 10 and the auxiliary digging piece 25 at the lower end of the rotating casing 2 are
Since the ground can be excavated by the turning motion of the machine, even if a hard ground layer is encountered, it can be easily dug and penetration operations can be performed. In particular, the excavating blade 10 has an outer end protruding outward from the rotating casing 2, an inner end protruding inward from the fixed casing 4, and the casings 2 and 4 are moved inward and outward directions from the outer end to the inner end. Since the cutting edge 10a is formed to extend across the rotating casing 2, the ground covers not only the surrounding area of the rotating casing 2 but also the surrounding area of the rotating casing 3.
As a result, the ground resistance applied to the lower end of the rotating casing 2 and the lower end of the fixed casing 4 during excavation is significantly reduced, making the casing work easier and faster. be exposed. Incidentally, the excavated soil that has entered between the rotating casing 2 and the fixed casing 4 during the casing penetration is removed by the air jet injected from the tip of the air jet supply vibrator 27 through the gap between the lower end of the fixed casing 4 and the vibrofront 9. 2 and rises in the gap between the outer circumferential surface of the fixed casing 2 and the inner circumferential surface of the rotating casing 2.
The frictional resistance between these two casings 2.3
It passes through the gap and is discharged from the opening 26 for discharging soil as appropriate.

When the rotating casing 2 is penetrated to a predetermined depth, its rotation is stopped and air supply from the air supply vibrator 21 is started, and the fixed casing 4 filled with sand is
increase the air pressure in the head space of the The sand in the fixed casing 4 is pressurized by the pressurized air, and while the rotating casing 2 is driven to rotate in the opposite direction to the direction of penetration, the fluid pressure cylinder 8 is extended. Then, the inner rod 7 is lowered to the lower limit position, the lower end surface of the fixed casing 4 is opened, the vibro front 9 is vibrated at the same time, and the air jet is ejected from the air jet supply vibrator 27. As the rotary casing 2 is pulled out, pressurized sand is pushed out from the lower end of the fixed casing 4 to create sand piles in the ground. In this case, the sand pushed out from the lower end of the fixed casing 4 is subjected to the vibration action of the vibrofront 9, so that a sufficiently consolidated and strong sand pile can be formed. By raising the rotating casing 2 to the ground, 1
Finish building the second sand pile.

When all the sand in the fixed casing 4 is pushed out into the ground as described above and the construction of the first sand pile is completed, the inner rod 7 is raised to the upper limit position to close the lower end of the fixed casing 4,
Then, by opening the on-off valve 15 of the sand tank 5 and filling the fixed casing 4 with sand from the opening 12 through the communication path 13, this device is moved to another new sand pile site. 5 sand tanks by the time you finish moving.
After filling the fixed casing 4 with sand, a series of operations similar to those described above are continued at the new location to create a second sand pile.

In this way, when starting the construction of the second sand pile, hopper 6
Since there is no need to supply sand from outside, construction of the second sand pile can be started immediately after the construction of the first sand pile is completed. Therefore, it is sufficient to supply sand from outside as appropriate before starting the construction work of the third pile.

In this example, the sand tank can hold the sand equivalent to one fixed casing, but if a sand tank that can hold the sand equivalent to 5 to 6 casings is provided, 6 to 7 sand can be stored without sand replenishment. The piles can be constructed in succession and effectively.

In addition, in the embodiment, the rotary casing was inserted into the ground together with the fixed casing while being rotated, but by using an exciter instead of such a double casing, the upper and lower parts of the single casing (fixed casing) can be inserted into the ground. The driving may be performed while applying vibration.

(Effects of the Invention) The sand pile making device of the present invention has a sand tank between the hopper and the casing that can accommodate at least one casing's worth of sand, so it does not work as well as the conventional device. It is no longer necessary to supply and fill sand every time one sand pile is constructed, and if sand is supplied twice, at least two sand piles can be
The work can be carried out continuously without interruption, thereby reducing the time required to construct each sand pile. In particular, in the device of the present invention, a sand discharge opening communicating with the casing is provided at the bottom of the sand tank, an on-off valve is provided in this opening, and an air supply means is provided below this on-off valve. One sand pile can be easily discharged into the ground, making it possible to create sand piles reliably, and also when moving the equipment to the second sand pile creation location after completing the first sand pile creation. The sand in the sand tank is discharged and does not fall, and the sand can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a sand pile building device showing an embodiment of the present invention, and FIG. 2 is a bottom view of the same device. 1... Machine frame, 2... Rotating casing, 3... Electric motor, 4... Fixed casing, 5... Sand tank, 6...
...Sand supply hopper, lO...Drilling blade, 12...
Sand discharge opening, 13...Communication path, 15...Opening/closing valve, 21...Air supply pipe.

Claims (1)

[Claims] A casing suspended below a sand supply hopper is inserted into the ground, and sand piles are inserted into the ground by pulling out the casing while pressing the sand filled into the casing from the hopper with pressurized air. In the sand pile construction device for creating sand piles, a sand tank capable of storing sand with a capacity of at least one casing is interposed between the hopper and the casing, and a sand discharge port communicating with the casing is provided at the bottom of the sand tank. 1. A sand pile construction device, comprising: an opening for air, an on-off valve in the opening, and an air supply means for supplying pressurized air into the casing below the on-off valve.