JPH07100930B2 - Sand pile building equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is to insert a casing, which is hung continuously below a sand supplying hopper, into the ground, and to fill the inside of the casing from the hopper. , Sand, gravel, crushed stone, etc. in the ground by pulling out the casing (hereinafter simply referred to as sand)
The present invention relates to a sand pile forming device for forming a pile.

(Prior Art) This type of conventional sand pile forming device is one in which the upper end of the casing is directly connected to a chute provided in the lower part of the sand supply hopper. When the sand pile is formed, the casing is excited. It is driven by a machine, or it is pierced while rotating it using a rotating casing, and after the casing reaches a predetermined depth, the required amount of sand is filled into the casing from the 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.
We are constructing sand piles.

(Problems to be Solved by the Invention) In the conventional apparatus as described above, the sand for one casing is filled from the hopper into the casing every time one sand pile is constructed. Since other work will be interrupted during filling, the time required to create one sand pile will be considerably longer if a large number of sand piles are successively created at adjacent positions. It was inefficient.

In view of the above, the present invention makes it possible to continuously perform at least two sand piles without interrupting the work once the sand is supplied, and it is possible to shorten the time required to construct one sand pile. It is intended to provide a sand pile forming device.

(Means for Solving the Problem) The present invention is to solve the above-mentioned problems, and the means therefor will be described below with reference to FIG. 1 corresponding to the embodiment.

In a sand pile forming device comprising a sand supply hopper (6) and a casing (4) which is provided so as to hang down below the hopper (6), between the hopper (6) and the casing (4). Is provided with a sand tank (5) capable of accommodating at least one casing (4) of sand, and the sand tank (5) is concentric with the casing (4) and more than the casing (4). Is also formed in a cylindrical shape with a large diameter, and a sand discharge opening (12) communicating with the casing (4) is provided at the bottom of the sand tank (5), and the opening (12) is opened and closed. A valve (15) is provided and this on-off valve (15)
An air supply means (21) for supplying pressurized air to the inside of the casing (4) is provided below the.

(Operation) When the sand pile construction work is started using this device, the on-off valve (15) is opened, and the sand supplied from the hopper (6) into the sand tank (5) is used as the sand tank (5). The casing (4) is filled through the sand discharge opening (12) at the bottom. After filling the sand tank (5) with the required amount of sand, the on-off valve (15)
And the sand tank (5) is filled with at least one casing (4) of sand.

In this way, the casing (4) and the sand tank (5) are each filled with a required amount of sand, and the casing (4) is penetrated into the ground. After the casing (4) is penetrated to a predetermined depth, the casing (4) is provided by the air supply means (21).
By supplying pressurized air to the inside of the casing (4) to increase its internal pressure and thereby pressurizing the sand inside the casing (4), the sand inside the casing (4) is extruded from its lower end. , Build sand piles in the ground.

After all the sand in the casing (4) has been extruded into the ground and the first sand pile has been created, the on-off valve (15) is opened and the sand in the sand tank (5) is casing ( While filling the inside of 4), this device is moved to another sand pile construction site, and the filling of sand from the sand tank (5) into the casing (4) is completed during the movement, thereby It is not necessary to supply sand from the outside by the hopper (6) at the time of starting the formation of the second sand pile at the sand pile construction site in No. 1, and the work is interrupted after the construction work of the first sand pile. You can start the second sand pile construction work.

Since the sand tank (5) of the present device is formed in a cylindrical shape having a diameter larger than that of the casing (4) and being concentric with the casing (4), the length of the tank (5) is defined by the casing ( It is possible to make it shorter than 4), and by expanding the diameter, it is possible to make it a shape that can easily secure the sand capacity of one or more casings (4). The length of the entire device including the tank (5) can be sufficiently shortened, and the center of gravity of the entire device can be lowered. Thus, while the sand tank (5) can accommodate at least one sand of the casing (4), the length of the entire device including this tank (5) is sufficiently short and the center of gravity position is low. Since it is possible to use a leader or the like that supports this device with a low height, it is possible to reduce the construction cost, and the entire device does not sway during sand pile construction work. Penetration and extraction work of the casing (4) can be performed easily and properly.

If the diameter of the sand tank (5) is the same as or smaller than the diameter of the casing (4), or if the sand tank (5) is provided eccentrically with the casing (4), the sand tank The length of (5) is the same as or longer than that of the casing (4), and the position of the center of gravity of the entire device is high, and the position of the center of gravity is away from the central axis of the casing (4). become. Then, the length of the entire device including the casing (4) and the sand tank (5) becomes considerably long, and it is necessary to use a reader or the like having a considerably high height. The equipment is large and very large, construction cost rises, and the entire device is prone to roll during sand pile construction work, which hinders the penetration and extraction work of the casing (4). In addition, the work is extremely difficult.

(Embodiment) An embodiment will be described with reference to the drawings. FIG. 1 shows a sand pile building device, and in this drawing, reference numeral 1 is movable up and down by a leader (not shown) installed upright on a crawler crane or the like. In the machine frame that is suspended from the machine frame 1, a cylindrical rotary casing 2 is rotatably connected to the lower part of the machine frame 1. The rotary casing 2 is mounted on the machine frame 1 and has a pair of electric motors 3, 3 on both sides. And a gear transmission mechanism (not shown).
Reference numeral 4 denotes a cylindrical fixed casing that is concentrically inserted into the rotary casing 2. The lower end of the fixed casing 4 extends close to the lower end of the rotary casing 2, and the upper end extends to the upper part of the machine casing 1. A large-diameter cylindrical sand tank 5 is installed concentrically with the fixed casing 4 on the upper part of the machine casing 1, and is formed in a size capable of sufficiently storing sand of the capacity of one fixed casing 4. A sand supply hopper 6 is connected to the upper end of the sand tank 5. Reference numeral 7 denotes a hollow inner rod which is concentrically inserted into the fixed casing 4, the upper end of which is interlocked with a fluid pressure cylinder 8 as vertical drive means, and the lower end of which protrudes from the lower end of the fixed casing 4. A vibro flot 9 as a vibrator is attached to the projecting end portion.
Reference numeral 10 denotes an excavating blade which is arranged at the lower end of the rotary casing 2 so as to project downward and project inward.

A protective tube 11 for protecting the fluid pressure cylinder 8 is provided in the sand tank 5, the upper end is fixed to the upper wall of the sand tank 5, and the lower end is a mortar-shaped bottom wall of the sand tank 5. Part 5a
Through and is connected to the upper end of the fixed casing 4. The bottom wall 15a of the sand tank 5 has a sand discharge opening 1
2 is provided, the opening 12 communicates with the upper end of the fixed casing 4 through an inclined communication passage 13 formed below the bottom wall 5a, and the outer opening of the communication passage 13 has a blind flange. Blocked by 14.

An opening / closing valve 15 is provided at the sand discharging opening 12, and the opening / closing valve 15 is pivotally attached to the lower surface of the bottom wall 5a of the sand tank 5 to open / close the sand discharging opening 12 from the lower surface side. It comprises a plate 16, a fluid pressure cylinder 17 (for example, an air cylinder) for driving a valve plate, which is installed on the outer surface of the side wall 5b of the sand tank 5, and a wire 18 which interlocks and connects the valve plate 16 and the fluid pressure cylinder 17. A slider 19 connected to the tip end portion of the piston rod 17a of the fluid pressure cylinder 17 is vertically slidably engaged with a guide member 20 fixed to the sand tank side wall portion 5b. One end of the wire 18 supported by 22 is fastened and the other end is fastened to the valve plate 16. Therefore, when the piston rod 17a contracts as shown in FIG. When in the open position and the piston rod 17a extends downward, the wire 18 Valve plate 1 through
6 rotates upward to close the sand discharging opening 12. An air supply pipe 21 serving as an air supply means is provided in the communication passage 13 so as to project from the communication passage 13 into the fixed casing 4.

The fluid pressure cylinder 8 for vertically driving the inner rod is composed of, for example, a hydraulic cylinder. The upper end of the cylinder body is attached to the upper wall of the sand tank 5, and the tip end of the piston rod 8a is the inner rod 7. It is connected to the upper end. When the piston rod 8a of the fluid pressure cylinder 8 contracts upward and the inner rod 7 reaches the upper limit position, the vibro flot 9 mounted on the lower end of the inner rod 7 is set at one point in FIG. As shown by the chain line, the upper end is located at the lower end of the fixed casing 4 to close the lower end opening, and when the piston rod 8a extends downward and the inner rod 7 moves downward, the lower end of the fixed casing 4 is lowered. The lower end opening is opened apart from the site downward. Vibro flot 9 at the lower limit of inner rod 7
Is in the position shown by the solid line in FIG.

The excavating blade 10 is fixed to diametrically opposed positions on the outer peripheral surface of the lower end portion of the rotary casing 2 and fixed to the lower end portions of the pair of mounting frames 23, 23 projecting downward. As is clear from FIGS. 1 and 2, each excavating blade 10 has a cutting edge 10a at its lower end, and the cutting edge 10a has an outer end located outside the outer peripheral surface position of the rotary casing 2. So as to project so that the inner end portion of the fixed casing 4 extends sufficiently inward from the position of the inner peripheral surface of the fixed casing 4, and to traverse both casings 2 and 4 inward and outward from the outer end portion to the inner end portion. It is extended. Further, each of the excavating blades 10 has an entire side surface inclined with respect to a vertical plane passing through the central axis of the rotating casing 2 by, for example, 30 ° to 40 °,
Moreover, the inner end side is directed toward the rotation direction side of the rotary casing 2,
It is arranged so that it falls 20 ° to 30 °. In addition, a reinforcing frame piece 24 is interposed between the excavating blade 10 and the lower end of each mounting frame 23. Further, a reinforcing excavation piece 25 is attached to the lower end of the rotary casing 2 at an intermediate position in the circumferential direction of both excavating blades 10, 10, and the reinforcing excavation piece 25 is excavated by each excavating blade 10. It has the function of further crushing the crushed earth and sand, etc.
It has the role of a balance cone that balances with.

A large number of holes 26 for discharging soil are formed in the rotary casing 2, and an air jet supply pipe 27 for ejecting an air jet from the lower end of the fixed casing 4 is provided inside the fixed casing 4. .

Although not shown in the figure, the vibro flot 9 has a built-in electric motor and an eccentric shaft connected to the output shaft of the electric motor, and generates lateral vibration by eccentric rotation of the eccentric shaft caused by rotation of the electric motor. It is supposed to do. The cap tire for the electric motor is inserted into the inner rod 7 and is extended to the outside from an appropriate position on the upper portion of the inner rod 7. When the casing penetrates, the vibro flot 9 is in the non-actuated state at the position shown by the one-dot chain line in FIG. 1 due to the rise of the inner rod 7, and the lower end surface of the fixed casing 4 is closed at this position. When the casing is pulled out, the inner rod 7 is lowered to the position shown by the solid line in the figure to open the lower end surface of the fixed casing 4, and the vibrating action is performed at this position.

Next, a method of constructing a sand pile in soft ground by using the apparatus having the above-described configuration will be described.

When starting the sand pile creation work, first, the opening / closing valve 15 is opened to fill the sand supplied from the hopper 6 into the sand tank 5 into the fixed casing 4 from the sand discharge opening 12 through the communication passage 13. . 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 vibro flot 9. When the fixed casing 4 is filled with the required amount of sand (the sand filling amount is performed by the well-known weight type sand surface detection device provided in the fixed casing 4), the opening / closing valve 15 is closed, and then the hoppo 6 Supply more sand,
The sand tank 5 is filled with sand for one fixed casing 4 (this filling amount is performed by a weight type sand surface detection device provided in the sand tank 5).

In this way, the fixed casing 4 and the sand tank 5 are each filled with a required amount of sand, and the rotary casing 2 is driven to rotate and penetrates into the ground together with the fixed casing 4. In this casing penetration operation, since the ground can be excavated by the turning operation of the excavation blade 10 and the auxiliary excavation piece 25 at the lower end of the rotary casing 2, it is possible to easily excavate even if a hard ground layer is encountered. , The penetration operation can be performed. In particular, the digging blade 10 has an outer end protruding outward from the rotary casing 2, an inner end protruding inward from the fixed casing 4, and the casing 2, from the outer end to the inner end.
Cutting edge 1 extending across 4 in and out
Since 0a is formed, not only the peripheral portion of the rotary casing 2 but also most of the cross-sectional area surrounded by the rotary casing 3 is excavated in the ground. Ground resistance applied to the lower end and the fixed casing 4 lower end is significantly reduced,
This makes the casing penetration operation easier and faster. The excavated earth and sand that enter between the rotating casing 2 and the fixed casing 4 while the casing is penetrating is the gap between the lower end of the fixed casing 4 and the vibro flot 9 when the air jet injected from the tip of the air jet supply pipe 27 Is sprayed to the outer peripheral side of the fixed casing 4 to rise in the gap between the outer peripheral surface of the fixed casing 4 and the inner peripheral surface of the rotating casing 2, so that the frictional resistance between the two casings 2 and 4 is reduced. It passes between both casings 2 and 4, and is appropriately discharged from an opening 26 for discharging earth and sand.

When the rotary casing 2 is penetrated to a predetermined depth, its rotation is stopped and the air supply from the air supply pipe 21 is started to increase the air pressure in the upper space of the fixed casing 4 filled with sand. Let The sand in the fixed casing 4 is pressurized by the pressure air thus increased, while the rotary casing 2 is rotationally driven in the direction opposite to that at the time of penetration, and the pulling-out of the rotary casing 2 is started while 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, and at the same time, the vibro flot 9 is vibrated, and an air jet is jetted from the air jet supply pipe 27. With the pulling-out operation of the rotating casing 2, the pressurized sand is extruded from the lower end of the fixed casing 4 to form sand piles in the ground. In this case, since the sand extruded from the lower end of the fixed casing 4 is subjected to the vibration action of the vibro flot 9,
It is possible to form a sufficiently consolidated and strong sand pile.
The construction of the first sand pile is completed by pulling up the rotating casing 2 to the ground.

When all the sand in the fixed casing 4 is extruded 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, the opening / closing valve 15 of the sand tank 5 is opened to fill the sand in the sand tank 5 from the opening 12 into the fixed casing 4 through the communication passage 13, while the device is moved to another new sand pile formation location. By moving the sand, the sand in the sand tank 5 is filled in the fixed casing 4 by the time the movement is completed, and a series of operations similar to the above is continuously performed at the new location to make the second sand pile. To create. In this way, it is not necessary to supply sand from the outside by the hopper 6 at the time of starting the formation of the second sand pile, so immediately after the completion of the first sand pile construction work of the second sand pile is completed. You can start.
Therefore, the supply from the outside may be appropriately performed before the work for forming the third pile is started.

In this embodiment, the sand tank that can store the sand of one fixed casing is used, but if a sand tank that can store the sand of 5 to 6 casings is provided, 6 to 7 sands can be supplied without replenishing the sand. Pile can be constructed continuously and effectively.

Further, in the embodiment, the rotary casing is inserted into the ground together with the fixed casing while being rotationally driven, but by using an exciter instead of such a double casing, a single casing (fixed casing) is vertically moved. You may make it drive while giving a vibration.

(Effects of the Invention) In the sand pile building device of the present invention, since the sand tank capable of containing at least one casing of sand is provided between the hopper and the casing, the sand pile forming device is different from the conventional device. It is no longer necessary to supply and fill sand every time one sand pile is created, and once sand is supplied, at least two sand piles are
The work can be continuously performed without interruption, which can reduce the time required to construct one sand pile. In particular, in the device of the present invention, the sand discharge opening communicating with the casing is provided at the bottom of the sand tank, the opening / closing valve is provided at this opening, and the air supply means is provided below the opening / closing valve. When one sand can be easily discharged into the ground and sand piles can be reliably constructed, and when the device is moved to the second sand pile construction location after finishing the first sand pile construction The sand in the sand tank is not discharged and dropped, and the sand can be used effectively.

Further, in the device of the present invention, since the sand tank capable of accommodating at least sand for one casing is formed in a tubular shape that is concentric with the casing and has a diameter larger than that of the casing, It can be made shorter than the casing, and by expanding the diameter, it can be made into a shape that can easily secure the sand capacity of one or more casings, which makes the length of the entire device including the casing and the sand tank longer. The length can be sufficiently shortened, and the center of gravity of the entire device can be lowered. In this way, the sand tank can accommodate at least one casing of sand, but the length of the entire apparatus including this tank can be sufficiently shortened and the center of gravity thereof can be lowered, so that the apparatus is supported. A relatively low height can be used for the leader, etc. Therefore, the equipment for standing the leader etc. can be simplified, the construction cost can be reduced, and the device can be used during the sand pile construction work. The entire body does not sway, and the work of inserting and pulling out the casing can be performed easily, properly and safely.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a sand pile forming apparatus showing an embodiment of the present invention, and FIG. 2 is a bottom view of the same apparatus. 1 machine frame, 2 ... rotating casing, 3 ... electric motor, 4 ...
Fixed casing, 5 ... sand tank, 6 ... sand supply hopper, 10 ... excavation blade, 12 ... sand discharge opening, 13 ... communication passage, 15 ... open / close valve, 21 ... air supply pipe.

Claims (1)

[Claims] 1. A sand pile forming apparatus comprising a sand supply hopper and a casing which is provided so as to hang down below the hopper, wherein a capacity of at least one casing is provided between the hopper and the casing. A sand tank capable of accommodating sand is provided, and the sand tank is formed in a cylindrical shape that is concentric with the casing and has a diameter larger than that of the casing. An opening for use is provided, an opening / closing valve is provided in the opening, and an air supply means for supplying pressurized air into the casing is provided below the opening / closing valve. .