JPS648129B2 - - Google Patents

Description

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

In the present invention, a casing is suspended and connected to the lower part of a machine frame suspended by a leader via a sand charging hopper, an inner rod is inserted into the casing, and the inner rod is inserted into the casing for a required stroke. The present invention relates to a sand pile building device that moves up and down and also vibrates independently of the up and down movement.

(Prior art and its problems) According to this type of device that has been used in the past, when driving (penetrating) the casing, the inner rod is integrally fixed to the casing via a connecting means. The casing is then transmitted to the casing through the inner rod to vibrate it, and penetrates into the ground to a predetermined depth while vibrating the casing, after which the connection by the connecting means is released and the edge of the inner rod and the casing is separated. The inner rod is moved up and down in the casing by a vertical drive means and is vibrated by an exciter, etc. to compact the sand thrown into the casing, and the casing is pulled out and the sand is pushed out from the lower end of the casing while the sand pile is being built. However, in the case of such a device, as mentioned above, the connecting means must be operated to connect or disconnect the inner rod and the casing each time the casing is inserted or pulled out. Moreover, in particular, when penetrating the casing, the casing is penetrated into the ground only by the vibration effect of an exciter or the like transmitted to the casing, which has the disadvantage that the penetrating 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. 146512/1982, which is equipped with a rotating casing having a screw on the outer circumferential surface. According to this, there is no need to connect or disconnect the inner rod and the casing each time the casing is inserted or pulled out, unlike the conventional device described above, and the insertion work can be performed quickly.
However, in this sand pile construction device, the upper end of the inner rod is fixed to a mounting base that is attached to the guide column so that it can be raised and lowered, and the telescopic lifting operation means such as an air spring that is interposed between the mounting base and the mounting base is not extended or retracted. The inner rod is moved up and down via a mounting base, but since a pair of rotational drive devices on both sides for driving the rotating casing are mounted on this mounting base, the inner rod and this In addition to the weight of the exciter such as the air hammer installed at the lower end, the weight of the two rotary drive devices is required, so the telescopic lifting operation means requires a fairly large operation with corresponding horsepower. There was a problem in that a method was required and the cost was high.

In addition, 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 an outer peripheral side surface of this rotary vertical drive shaft. A plurality of sets of two guide rollers that are shaft-mounted, and a guide that protrudes from the inner circumferential side of a pipe member that is connected to the upper part of the rotating casing and that is 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 by means of a rotational force transmitting means consisting of a plate, but such a transmission mechanism requires a large number of parts. As the number of units increased, the structure became complicated, which not only caused a rise in production costs, but also caused problems in terms of maintenance due to frequent breakdowns.

Furthermore, in this sand pile building apparatus, since the exciter is attached to the lower end of the inner rod, there is a problem in that piping equipment for operating pressure fluid for the exciter is complicated.

An object of the present invention is to provide a sand pile construction device that can solve the above-mentioned problems.

(Means for Solving the Problems) The device of the present invention to achieve the above object has a fixed casing connected to the lower part of the machine frame suspended by the leader via a sand charging hopper, and the fixed casing is 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 the casing, and an inner rod is inserted into the fixed casing and the rotating casing so as to be vertically movable. A vibration means is installed at the upper end, a rotary drive means is arranged at a fixed position within the machine frame, and the rotary drive means is rotatably fitted on the inner rod at the upper end of the coupling sleeve. The lower end of the connecting sleeve and the upper end of the rotary casing are connected to each other with a space in the circumferential direction 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. The inner rod and the vibrating means are integrally connected by a plurality of interposed connecting pieces, and the inner rod and the vibration means are suspended from the leader by a rope, and the rope is wound or fed out by a winch provided on the crane body. It is characterized by being able to be connected.

(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 the crane body, 2 is a leader, 3 is a machine frame that is suspended from the leader 2 so that it can be raised and lowered, and the lower part of this machine frame 3 is A cylindrical fixed casing 5 is connected via a sand charging hopper 4, and at the bottom of this fixed casing 5 there is a cylindrical rotating casing 6 having approximately the same diameter as the casing 5 and having a screw 6a screwed onto its outer peripheral surface. are coaxially and rotatably connected to the fixed casing 5, and a hollow (or solid) inner rod 7 is inserted into the fixed casing 5 and the rotating casing 6 so as to be vertically movable.
A vibrator 8 is installed at the upper end of the inner rod 7. Further, a rotation driving means 9 for rotating the rotating casing 6 is provided within the machine frame 3, and is interlocked and connected to the rotating casing 6 via a connecting sleeve 10 rotatably fitted onto the inner rod 7. .

To explain the above structure in more detail, the machine frame 3 has four pillars 13 erected and fixed between the upper mount 11 and the lower mount 12. is supported so that it can be raised and lowered, and the above-mentioned exciter 8 and inner rod 7 are mounted on this elevator platform 14.
is fixed. A lifting device 15a is attached to the lifting platform 14 via shock absorbers 15, and one end of a rope 16 is fixed to this. It is wound in 17. By winding or letting out the rope 16 by the winch 17, the exciter 8 and the inner rod 7 are moved up and down. The vibrator 8 used here is, for example, a noiseless hydraulic vibrohammer.

As shown in FIGS. 1 and 2, the rotation drive means 9 includes a pair of reducer-equipped motors 18, 18 disposed on both sides of the inner rod 7 in the lower part of the machine frame 3, and these motors 18, Small gear 19 fixed to the output shaft of 18,
19 is engaged with a large gear 20 fixed to the upper end of the connecting sleeve 10, and the sleeve 10 is rotated via the small gears 19, 19 and the large gear 20 by rotation of both motors 18, 18 in the same direction. It is something that happens as you let it happen. The lower end of the connecting sleeve 10 and the upper end of the rotating casing 6 are integrally connected by a plurality of vertically elongated connecting pieces 21, and the upper end of the rotating casing 6 is connected to the fixed casing 5 via bearing members 22, 22. It is rotatably held at the lower end of the As shown in FIG. 3, the connecting pieces 21 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 10 and the inner circumferential surface of the lower end of the rotating casing 6. They are arranged radially.

The machine frame 3 has a pulley 23 attached to the upper part of the upper frame 11 and a pulley 2 attached to the top of the leader 2.
The crane body 1 is suspended from the crane body 1 by a rope 25 connected to the cranes 4 and 24 so as to be able to be raised and lowered. Further, the machine frame 3 and the leader 2 are provided with guide members and the like for the machine frame 3 to move up and down along the leader 2, but since these are well known, their explanation will be omitted.

To operate the sand pile making device having the above-described configuration, first operate the rope 25 to suspend and support the machine frame 3 from the top of the leader 2 at an appropriate height, and then use the winch 17 to suspend the machine frame 3 from the top of the leader 2. Operate 16,
As a result, while the inner rod 7 is held in a fixed position relationship with respect to the fixed casing 5 and the rotating casing 6 as shown by solid lines in FIG. The casing 6 is rotated in one direction (the direction in which the screw 6a excavates the ground), and the ropes 16 and 25 are let out to lower the casings 5 and 6 through the machine frame 3, and the rotation of the rotating casing 6 excavates the ground. I'm going to make a hole. When the lower end of the rotary casing 6 reaches the required depth in the ground, the feeding operation of the ropes 16 and 25 is stopped, and the rotary casing 6 is rotated in the opposite direction to the direction when penetrating the excavation, and then stopped until then. While operating the exciter 8, the rope 16 is operated by the winch 17 to move the inner rod 7 up and down within the casing 6, and the fixed casing 5 and the rotating casing 6 are placed in the ground while winding up the rope 25 for lifting operation. I'm going to pull it out. During this pulling, sand is introduced from the fixed casing 5 into the rotating casing 6 from the hopper 4, and the sand thus introduced is caused to vibrate up and down the inner rod 7 due to the operation of the winch 17 and the operation of the exciter 8. The sand is compacted by small vibrations with a smaller amplitude than the vibration, and the compacted sand is placed in the casing 5.
As the sand pile is being pushed out from the lower end of the rotating casing 6 as the sand pile is being pulled out, the sand pile is formed.

In addition, a weight is inserted from the outside to the inside of the upper end of the fixed casing 5 via a thin rope, and this weight is placed on the sand surface fed from the hopper 4, and the weight is adjusted according to the level of the sand surface. If you allow it to move,
The fixed casing 5 is fixed by the movement of the thin rope mentioned above.
The amount of sand inside can be measured.

(Effects of the Invention) The present invention comprises a fixed casing that is connected to the lower part of the machine frame by hanging down through a sand charging hopper, and a rotating casing with a screw extending below the fixed casing. The lower end of the coupling sleeve rotatably connects the upper end of the rotary casing to the lower end, and the upper end is interlockingly connected to a rotary drive means disposed at a fixed position within the machine frame, and the upper end of the rotary casing. Department and
The outer peripheral side surface of the lower end of the connecting sleeve and the inner peripheral side surface of the upper end of the rotating casing are integrally connected by a plurality of connecting pieces interposed at intervals in the circumferential direction, The mechanism for transmitting the rotation of the rotational drive means to the rotating casing can be essentially composed of two parts: the connecting sleeve and the connecting piece at the lower end of the connecting sleeve, so the number of parts is extremely small, the structure is simple, and manufacturing costs can be reduced. It has the effect of being significantly cheaper.

In addition, in the present invention, the rotary drive means for driving the rotating casing is provided at a fixed position within the machine frame, and the inner rod is made to bear the weight of only the vibration means, so that it can be used as a means for vertically moving the inner rod. A relatively small device is sufficient for this, and since a winch installed on the crane body is used as the vertical movement means, the structure within the machine frame can be made smaller and lighter.

Furthermore, since the vibrating means is provided at the upper end of the inner rod, piping equipment for operating pressure fluid and the like for operating the vibrating means can be simplified.

[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. It is an enlarged sectional view. DESCRIPTION OF SYMBOLS 1...Crane body, 2...Leader, 3...Machine frame, 4...Sand charging hopper, 5...Fixed casing, 6...Rotating casing, 6a...Screw, 7...Inner rod, 8... ...Exciter (vibration means), 9
... Rotation drive means, 10 ... Connection sleeve, 1
6...Rope, 17...Winch, 21...Vertical connecting piece.

Claims (1)

[Claims] 1. A fixed casing is connected to the lower part of the machine frame suspended by the leader via a sand charging hopper, and the upper end of the rotating casing having a screw on the outer peripheral surface is coaxially connected to the lower end of the fixed casing. The inner rod is vertically movably inserted into the fixed casing and the rotating casing, and a vibrating means is installed at the upper end of the inner rod, and a rotational drive means is installed within the machine frame. the rotary drive means is operatively connected to the upper end of a connecting sleeve rotatably fitted over the inner rod, and the lower end of the connecting sleeve and the upper end of the rotary casing are connected to each other. 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 are integrally connected by a plurality of connecting pieces interposed at intervals in the circumferential direction, and the inner rod and vibration A sand pile construction device comprising: a means suspended from the leader by a rope, and the rope connected so as to be able to be wound or paid out by a winch provided on the crane body.