JPS648132B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention is used in the field of improving soft ground.

The present invention involves drilling a casing into the ground to a predetermined depth while rotating the casing, filling the casing with sand, and then supplying pressurized air from above to the sand filled in the casing to press the sand. This invention relates to a sand drain driving device that extrudes a casing from the lower end to form a sand pile in the ground.

(Prior art and its problems) In conventional sand drain casting equipment of this type, a rotary drive device for rotating the casing was installed in the machine frame, but this rotary drive device was quite heavy. When such a drive device is located at the top of a tall leader at the beginning of work, the center of gravity of the entire sand pile making device is set at a high position, forcing work to be performed in an unstable condition. I had the problem you mentioned.

In general, in the sand drain casting method, in order to check the supply status of sand supplied into the casing when pulling out the casing,
That is, a weight-type sand level detection device is used to detect whether the sand is properly flowing down to the lower part of the casing and whether it is being reliably pushed out and discharged from the lower end of the casing. In this device, for example, a string extending from a torque winch of the main body of the detection device installed on the side of the crane that supports the leader is suspended into the casing from above, and a weight attached to the tip of the string is attached to the upper surface of the loaded sand ( The string is kept tensioned to maintain balance in this resting state, and as the sand surface inside the casing descends as the casing is pulled up, the weight on the sand surface The string that suspends the sand is let out from the torque winch, and the flow and discharge state of the sand is checked while measuring the amount of the let out of the string on the detection device main body side. However, with conventional sand drain casting equipment, sand is directly poured into the casing, so if the casing is pulled out while rotating, the sand inside the casing will rotate with the casing. The above sand surface detection device cannot be applied, in other words, the weight placed on the sand surface moves as the sand rotates, making it impossible to perform proper detection. The sand drain removal work had to be interrupted, which resulted in a decrease in the efficiency of the sand drain installation work.

The main object of the present invention is to solve the problems in the conventional sand drain casting apparatus as described above.

(Means for Solving the Problems) The device of the present invention for achieving the above object is a rectangular cylindrical casing that is rotatably suspended from the lower part of a machine frame suspended by a leader. , a casing whose lower end is formed into a cylindrical shape and a screw is provided on the outer periphery; and a rotational drive means provided at an intermediate or lower part of the leader for rotating the casing while allowing the casing to move up and down. , a hopper for feeding sand installed in the machine frame,
A fixed pipe that communicates with the hopper and is inserted into the casing from the machine frame side over the entire length of the casing, a means for supplying pressurized air into the fixed pipe from above, and a means for supplying pressurized air into the fixed pipe from the machine frame side. and a vibrator installed at the lower end of the inner rod which is inserted into the casing. The rotating body is configured such that it can be rotated and the shafts are mounted horizontally so as to surround the casing, and a gear is provided on the outer periphery of the rotating body, and this gear is meshed with a gear fixed to the output shaft of the electric motor. It is characterized by

(Example) Next, an example of the present invention will be described based on the drawings.

Figure 1 is an overall front view of the sand drain casting device, and Figure 2 is a side view of its main parts. In these figures, 1 is suspended from the top of the leader 2 via a wire (not shown). The machine frame is supported on the guide rail 3 of the leader 2 through a guide 4 so as to be able to move up and down, and a sand charging hopper 5 is integrally installed within the machine frame 1. Reference numeral 6 denotes a rectangular cylindrical casing that is suspended and connected to the lower part of the machine frame 1. Its upper end 6a and lower end 6b are formed in a cylindrical shape, and the cylindrical upper end 6a of the casing 6 is oriented in the radial and thrust directions. The casing 6 is rotatably suspended from the machine frame 1 via a bearing 7 that supports a load of A lid 8 is attached so as to be openable and closable. Reference numeral 9 denotes a rotational drive means for rotating the prismatic cylindrical casing 6 while allowing it to move up and down, and is provided on a support frame 10 fixed to the lower part of the leader 2. Reference numeral 11 denotes a cylindrical fixed tube, which is inserted concentrically and downwardly into the rectangular cylindrical casing 6. Its upper end is fixed to the machine frame 1, and is connected to the outlet of the hopper 5 so that the fixed tube The lower end of the tube 11 extends to the lower end of the casing 6.
Furthermore, a valve mechanism 12 capable of tightly closing the upper end opening of the fixed pipe 11 leading to the hopper 5 and an air supply nozzle 13 as a means for supplying pressurized air into the fixed pipe 11 are provided at the upper part of the fixed pipe 11. has been done. Reference numeral 14 denotes a hollow shaft-shaped inner rod inserted into the fixed tube 11. The upper end of the inner rod 14 is attached and fixed to the upper part of the fixed tube 11 via a mounting frame member 15 as shown in FIG. The lower end of the inner rod 14 extends close to the lower end of the fixed tube 11, and a vibrator 16 is installed at the lower end.

The rotation driving means 9 is shown in FIGS. 1, 2, and 5.
As is clear from the figure, four guide rollers 18 are provided inside the hollow cylindrical rotating body 17 into which the rectangular cylindrical casing 6 can be inserted, so that the four guide rollers 18 are rotatably in contact with the outer peripheral surface, that is, the four side surfaces of the casing 6. Each guide roller 1 is arranged so as to surround the casing 6.
8 is rotatably supported by a pin 19, and
A gear 20 is equipped on the outer periphery of the rotating body 17, and the cylindrical rotating body 17 is mounted on a hollow cylindrical base 21 fixed on a support frame 10 extending from the leader 2 side. , are rotatably supported via bearings 21a, and the guide rollers 18...
are rotatably supported on each of the four sides of the rectangular cylindrical casing 6, and a gear 20 on the outer periphery of this rotating body 17
The electric motor 22 installed on the support frame 10 is
The output shaft 23 is meshed with a fixed gear 24, and the rotation of the output shaft 23 causes the gears 24,
The rotating body 17 is rotated via the rotor 20, thereby rotating the rectangular cylindrical casing 6 while allowing it to move up and down.

The vibrator 16 is made of, for example, a vibrofrot, and as shown in FIG. 6, an electric motor 26 is disposed within a cylindrical float body 25, and an eccentric shaft body 27 integrally connected to the output shaft of the electric motor 26 is mounted on a shaft frame. The float body 25 is made to vibrate in the lateral direction (in the direction intersecting the length direction of the inner rod 14) by the eccentric rotation of the eccentric shaft body 27 caused by the rotation of the electric motor 26. .
The float body 25 is connected to the lower end of the inner rod 14 via a coupling 28. Also, the electric motor 26
A cap tire 29 is inserted into the hollow portion 14a of the inner rod 14 from the upper end of the inner rod 14 and connected to the electric motor 26 in the float body 25.

The bottom cover 8 also has two halves 8a whose interiors are formed by vertically dividing a hollow inverted cone into two parts.
8a is screwed onto the lower end of the casing 6. Normally, when the casing 6 is suspended above the ground, it is open as shown by the solid line in Figure 1, and the casing 6 penetrates into the ground. When the casing 6 is lifted out of the ground, it closes into an inverted conical shape, as shown by the imaginary line in the figure, and when the casing 6 is pulled up through the ground, it assumes an open position, as shown by the solid line in the figure. As shown in FIGS. 7 to 9, the valve mechanism 12 includes a valve receiver 31 having an elliptical shape in plan view and having a valve port 30.
and a valve body 32 that opens and closes the valve port 30. The valve receiver 31 is fixed to the upper end of the short fixed pipe 11 in an inclined position, and a packing 33 is attached to the lower peripheral edge of the valve port 30. The valve body 32 is mounted on the lower side of the valve body 31, and the hinge member 36 and pin 37 at one end of the support frame 35 fixed to the hinge member 34 of the valve body 31 and the lower surface of the valve body 32 are attached. This allows the valve body 32 to be opened and closed with respect to the valve port 30. Normally, this valve body 32 is attached to the ninth valve.
It is in the open state at the position indicated by the dashed line in the figure,
When pressurized air is supplied from the air supply nozzle 13 into the short fixed tube 11, the valve body 32 is pressed upward and rotated upward by the pressure air jetted from the tip of the nozzle 13, and is held in the closed position, thereby closing the valve. I'm starting to do that.

Next, when using the sand drain casting device having the above-described configuration, first, with the machine frame 1 of the device suspended and supported at an appropriate height from the top of the leader 2, the rotary drive means 9 is turned on. The casing 6 is activated to rotate the casing 6 in the forward direction while feeding out a lifting operation wire (not shown) to lower the casing 6 and penetrate into the ground.At this time, the casing 6
When the bottom cover 8 at the lower end hits the ground, the bottom cover 4 is closed. In this way, while rotating the casing 6, it penetrates into the ground and when it reaches a predetermined depth,
A required amount of sand is filled into the fixed tube 11 from the hopper 5. After filling the sand, supply of pressurized air into the fixed pipe 11 through the air supply nozzle 13 is started,
At this time, the pressure of the air ejected from the nozzle 13 operates the valve mechanism 12 to the closed position as shown by the solid line in FIG. 1, and the closing of the valve mechanism 12 increases the air pressure within the fixed pipe 11. Meanwhile, the vibrator 16 is started to vibrate the surrounding sand. The sand filled in the fixed tube 11 is pressed by the pressurized air from the upper part of the fixed pipe 11 and vibrated in the lower part of the fixed pipe 11 to compact and compact the sand, and at the same time, the casing 6 is The casing 6 is pulled up while rotating in the opposite direction and winding up the wire for lifting and lowering the machine frame 1. When the casing 6 is pulled up in this way, the bottom cover 8 opens and the compacted sand is pushed out from the lower end of the fixed tube 11. Sand piles are gradually formed as the sand piles move. In addition, in order to check whether the sand thrown in when the casing 6 is pulled up is reliably pushed out from the bottom end of the casing, a weight-type sand surface detection device is used to detect the sand surface. Since the sand is substantially put into the fixed tube 11 and is not in contact with the casing 6, the sand inside does not rotate as the casing 6 rotates, and therefore is pulled up while the casing 6 is rotating. It is possible to accurately detect the sand surface even in the case of sand. In FIG. 1, W indicates a vertical plumb for detecting the sand surface, which is suspended from the string H, and S indicates the sand surface.

(Effects of the Invention) According to the present invention, since the rotational drive means is not provided in the machine frame but is provided on the leader side, particularly in the middle or lower part of the leader, The weight can be reduced and support by the leader can be facilitated, and the center of gravity of the entire device can be lowered, allowing work to be carried out in a stable state.

Further, according to the present invention, the fixed pipe connected to the sand charging hopper is inserted into the casing in a hanging manner, so that the sand that has been thrown in is substantially accumulated in the fixed pipe, and the casing is rotated. As a result, the sand itself is not rotated, and therefore, when detecting the sand surface to check the state of extrusion and discharge of the sand that has been put in, the rotation of the casing is stopped and the extraction operation is interrupted as in the conventional method. There is no need,
Construction work can be done continuously.

Furthermore, in the present invention, in addition to the pressing action by pressurized air, the sand is compacted by the vibration action by the vibrator at the bottom of the casing, so that a denser sand pile can be formed.

Furthermore, the present invention uses a rectangular cylindrical casing having a cylindrical lower end and a screw provided on its outer periphery, and the rotation drive means for rotating the rectangular cylindrical casing includes: Inside the rotating body into which the casing can be inserted, a plurality of guide rollers are mounted horizontally so as to be able to roll on each side surface of the casing and to surround the casing. Since a gear is provided on the outer periphery and this gear meshes with a gear fixed to the output shaft of the electric motor, each guide roller can be brought into close contact with each side of the casing without any gaps. The rotation of the electric motor can be efficiently transmitted to the casing during the ascent and descent of the sand pile, and the casing can be prevented from rolling or wobbling during the ascent and descent, making it possible to form a sand pile with a uniform diameter over its entire length.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the sand drain casting device according to the present invention, and FIG.
3 is a sectional view taken along the line -- in FIG. 1, FIG. 4 is a sectional view taken along the - line in FIG. Fig. 6 is an enlarged sectional view of the vibrator, Fig. 7 is a bottom view of the valve receiver constituting the valve mechanism, Fig. 8 is a bottom view of the valve body,
FIG. 9 is a longitudinal cross-sectional view showing how the valve mechanism is installed. DESCRIPTION OF SYMBOLS 1...Machine frame, 2...Leader, 5...Sand charging hopper, 6...Casing, 9...Rotation drive means, 11...Fixed pipe, 13...Air supply nozzle,
4... Inner rod, 16... Vibrator, 17... Rotating body, 18... Guide roller, 19... Gear on rotating body side, 22... Electric motor, 23... Output shaft, 24
...Gear on the output shaft side.

Claims (1)

[Claims] 1. A rectangular cylindrical casing that is rotatably suspended from the lower part of the machine frame suspended by the leader, the casing having a cylindrical lower end and a screw provided on its outer periphery, and the leader. a rotary drive means provided in the middle or lower part of the casing for rotating the casing while making it possible to raise and lower the casing; a hopper for feeding sand disposed in the machine frame; A fixed pipe inserted into the casing from the frame side over the entire length of the casing, a means for supplying pressurized air into the fixed pipe from above, and a lower end of an inner rod inserted into the fixed pipe from the machine frame side. and a vibrator installed in the casing, and the rotation driving means includes a plurality of guide rollers that can be rotatably connected to each side of the casing inside a rotating body into which the casing can be inserted, and a vibrator that is installed in the casing. The rotating body has a shaft mounted horizontally so as to surround the rotating body, and a gear is provided on the outer periphery of the rotating body, and this gear is meshed with a gear fixed to the output shaft of the electric motor. Drain installation equipment.