JPS648127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sand pile construction device for constructing sand piles in soft ground in order to improve the soft ground.

(Prior art and its problems) According to conventionally used sand pile construction equipment, when driving (penetrating) the casing, the inner rod is integrally fixed to the casing via a connecting means. The vibration generated by the exciter is transmitted to the casing through the inner rod, the casing is vibrated and penetrates into the ground to a predetermined depth, and then the connection by the connecting means is released and the edge between the inner rod and the casing is cut. The inner rod is moved up and down within the casing by a vertical drive means and is vibrated by a vibrator to compact the sand thrown into the casing, while the casing is pulled out and the sand is pushed out from the lower end of the casing to form a sand pile. However, in the case of such a conventional device, as described above, each time the casing is penetrated and pulled out, the connecting means must be operated to connect or disconnect the inner rod and the casing. Moreover, in particular, when the casing is penetrated, the casing is penetrated into the ground only by the vibration effect of the vibrator transmitted to the casing, which has the disadvantage that the penetration work cannot be carried out quickly.

As a device proposed to solve the above-mentioned inconvenience, there is a device as disclosed in Japanese Patent Application Laid-Open No. 146512/1983. This system is equipped with a rotating casing with a screw extending over the length of the casing, and unlike the conventional device described above, there is no need to connect or disconnect the inner rod and the casing each time the casing is inserted or pulled out, and the penetrating work is also simplified. It can be done quickly.

By the way, this sand pile making device has a rotary vertical drive shaft whose upper end is interlocked with a rotary drive device and can move up and down together with the mounting base when the inner rod moves up and down, and a rotary vertical drive shaft which is attached to the outer circumferential side of the rotary vertical drive shaft. It consists of a plurality of sets of two guide rollers, and a guide plate protruding from the inner circumferential side of a continuous pipe member at the upper part of the rotating casing and inserted between each of the two guide rollers. The rotation of the output shaft of the rotary drive device is transmitted to the rotating casing extending below the fixed casing using the rotational force transmitting means, but such a transmission mechanism requires an excessive number of parts. As time went on, the structure became more complex, which not only led to higher production costs, but also caused problems in terms of maintenance due to frequent breakdowns.

In addition, in this conventional device, since the exciter is installed at the lower end of the inner rod, piping for the operating pressure fluid of this exciter is routed inside the inner rod, which has a much smaller diameter than the casing. It is necessary to install the equipment inside the rod and along its entire length, making the production cost very high.Also, since the exciter itself operates while being buried in the ground, the outlet for the working fluid is not visible. There was a problem that it was easy to break down due to clogging.

It is an object of the present invention to solve such problems.

(Means for Solving the Problems) To achieve the above object, the sand pile construction device of the present invention has a fixed casing having a sand charging hopper connected to the lower part of the machine frame suspended from the leader. The upper end of a rotating casing having a screw on its outer peripheral surface is coaxially and rotatably connected to the lower end of this fixed casing, and the inner rod is inserted into these fixed and rotating casings so as to be vertically movable. A vibrator is installed at the upper end of the inner rod, a vertical drive means and a rotational drive means are provided in the machine frame, the vertical drive means is interlocked and connected to the inner rod, and the rotational drive means is The connecting sleeve is interlocked with the upper end of the connecting sleeve that is rotatably fitted on the inner rod, and the lower end of the connecting sleeve and the upper end of the rotating casing are connected to the outer circumferential side of the lower end of the connecting sleeve and the upper end of the rotating casing. It is integrally connected to the inner circumferential side surface of the portion by a plurality of connecting pieces interposed at intervals in the circumferential direction.

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

Figure 1 shows a sand 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, and is movable up and down. A cylindrical fixed casing 3 is connected to the casing 3 via a sand charging hopper 2, and at the bottom of the fixed casing 3 there is a rotating cylindrical casing having approximately the same diameter as the casing 3, with a screw 4a screwed onto the outer circumferential surface of the fixed casing 3. A casing 4 is coaxially and rotatably connected to the fixed casing 3, and a hollow (or solid) inner rod 5 is inserted into the fixed casing 3 and the rotating casing 4 so as to be vertically movable. A vibrator 6 is installed at the upper end of the inner rod 5. Further, a vertical drive means 7 for vertically moving the inner rod 5 for a required stroke and a rotational drive means 8 for rotating the rotary casing 4 are provided in the machine frame 1, and the vertical drive means 7 is interlocked with the inner rod 5. The rotation driving means 8 is interlocked with the rotary casing 4 via a connecting sleeve 9 which is rotatably fitted onto the inner rod 5.

To explain the above structure in more detail, the machine frame 1 has four columns 12 erected and fixed between an upper frame 10 and a lower frame 11. is supported so as to be movable up and down, and an inner rod 5 extends upward through a central opening 13a of this lifting table 13, and a support stand 14 on which an exciter 6 is installed is fixed to the upper end of this inner rod 5. The support table 14 and the lifting table 13 are integrally connected via a plurality of shock absorbers 15 made of, for example, coil springs. The exciter 6 is composed of, for example, a noiseless hydraulic vibrohammer, and the vertical vibration means 7 is composed of a vertical hydraulic or pneumatic cylinder.
The piston rods 7b are disposed on both sides, and each cylinder body 7a is fixed to the machine frame 1 in an upright manner, and the tip of the piston rod 7b is fixed to the lower surface side of the lifting table 13.
As shown in FIGS. 1 and 2, the rotational drive means 8 includes a pair of reducer-equipped motors 16, 16 disposed on both sides of the inner rod 5 in the lower part of the machine frame 1. Small gear 17 fixed to the output shaft of 16,
17 is meshed with the large gear 18 fixed to the upper end of the connecting sleeve 9, and the small gears 17, 17 and the large gear 1 are connected by rotation of both motors 16, 16 in the same direction.
The sleeve 9 is rotated through the sleeve 8. The lower end of the connecting sleeve 9 and the upper end of the rotating casing 4 are integrally connected by a plurality of vertically elongated connecting pieces 19, and the upper end of the rotating casing 4 is connected to the fixed casing 3 via bearing members 20, 20. It is rotatably held at the lower end. As shown in FIG. 3, the connecting pieces 19 are spaced from each other at sufficient intervals in the circumferential direction to allow sand to flow between the outer circumferential surface of the lower end of the sleeve 9 and the inner circumferential surface of the lower end of the rotating casing 4. They are arranged radially.

To operate the sand pile making apparatus having the above-mentioned structure, first, the machine frame 1 is suspended and supported at an appropriate height from the top of the leader (not shown), and then each cylinder, which is the vertical vibration means 7, is suspended and supported. piston rod 7b
is held in the extended position (raised position), thereby fixing the inner rod 5 in a fixed position within the fixed and rotary casings 3, 4 as shown by the solid line in FIG. The rotating casing 4 is rotated in one direction (the direction in which the screw 4a excavates the ground) via the connecting sleeve 9, and the lifting operation wire (not shown) is let out to lower the casings 3 and 4 via the machine frame 1. The ground is drilled by the rotation of the rotating casing 4. When the lower end of the rotating casing 4 reaches the required depth in the ground, the wire feeding operation is stopped, the rotating casing 4 is rotated in the opposite direction to the direction during excavation penetration, and the exciter that had been stopped until then is rotated. 6 and the vertical drive means 7 to pull out the fixed and rotating casings 3 and 4 from the ground while winding up the wire for lifting and lowering operations. During this pulling, sand is introduced from the fixed casing 3 into the rotating casing 4 from the hopper 2, and the sand thus introduced is caused to vibrate up and down the inner rod 5 due to the operation of the vertical drive means 7 and the exciter 6, and The compacted sand is compacted by small vibrations with a smaller amplitude than the vibration, and as the casings 3 and 4 are pulled out, the sand piles are formed while being pushed out from the lower end of the rotating casing 4.

FIG. 4 shows an embodiment in which the driving means for vertically moving the inner rod 5 is an air spring device. This vertical drive means 21 is arranged between a lifting table 13 that moves up and down along the supports 12 of the machine frame 1 and the upper frame 10 of the machine frame 1, and between this lifting table 13 and a fixed table 22 below the lifting table 13. Between them, there are a pair of bellows-like air spring bodies 23, 23 and 24, 24 on the left and right, respectively.
These upper air spring bodies 23, 23 are interposed
Pressure air from the air compressor is supplied to the lower air spring bodies 24, 24, and when supplying to one, the pressure air from the other is discharged, and the movable base 1
3 is configured to be moved up and down between the upper stand 10 and the fixed stand 22, and the up and down movement of the movable stand 13 causes the inner rod 5 to move up and down for a required stroke. According to the vertical drive means 21 made of such an air spring device, the speed of upward and downward movement of the inner rod 5 can be made faster than that using a cylinder device. The other structures are the same as the embodiment shown in FIG.

(Effects of the Invention) According to the present invention, the upper end of the rotary casing is rotatably connected to the lower end of the fixed casing, which is suspended and connected to the machine frame via the sand charging hopper. The lower end of the connecting sleeve, the upper end of which is interlockingly connected to the rotary drive means, and the upper end of the rotating casing are connected between the outer circumferential side of the lower end of the connecting sleeve and the inner circumferential side of the upper end of the rotating casing. It is integrally connected by a plurality of vertically elongated connecting pieces interposed at intervals in the direction, and the mechanism for transmitting the rotation of the rotation drive means to the rotating casing is substantially connected to the connecting sleeve. Since it can be constructed from two pieces, the connecting piece at its lower end, the number of parts is extremely small, the structure is simple, and the manufacturing cost can be significantly reduced.

Furthermore, according to the present invention, since the exciter is disposed at the upper end of the inner rod, the piping equipment for operating pressure fluid and the like for operating the exciter is much simpler than in conventional devices. This simplifies the piping work and can therefore reduce production costs, but since the exciter is not buried in the ground like conventional equipment, it is less likely to break down or be damaged. Moreover, if a failure occurs in this exciter during work, it can be dealt with quickly.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal cross-sectional whole front view showing an embodiment of the sand pile building device according to the present invention, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 3 is an enlarged sectional view taken along the - line in Fig. 1. The enlarged sectional view and FIG. 4 are front views of essential parts of a sand pile building device according to another embodiment. 1... Machine frame, 2... Hopper for sand charging, 3...
Fixed casing, 4...Rotating casing, 4a...
...Screw, 5...Inner rod, 6...Exciter, 7...
... Vertical drive means, 8 ... Rotation drive means, 9 ... Connection sleeve, 19 ... Connection piece.

Claims (1)

[Claims] 1. A fixed casing with a sand charging hopper is connected to the lower part of the machine frame suspended by the leader, and the upper end of the rotating casing, which has a screw on the outer peripheral surface, is attached coaxially to the lower end of the fixed casing. The inner rod is vertically movably inserted into the fixed and rotating casings, and an exciter is installed at the upper end of the inner rod. A driving means is provided, the vertical driving means is interlocked and connected to the inner rod, and a rotational driving means is interlocked and connected to the upper end of a connecting sleeve rotatably fitted over the inner rod, and the connecting sleeve is connected to the upper end of the connecting sleeve. The lower end and the upper end of the rotating casing are connected by a plurality of connecting pieces interposed at intervals in the circumferential direction between the outer peripheral side of the lower end of the connecting sleeve and the inner peripheral side of the upper end of the rotating casing. A sand pile creation device characterized by being integrally connected.