JPH0251005B2 - - Google Patents

Description

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

There have been various types of sand pile construction equipment for creating sand piles in soft ground, but one of them has a double pipe structure consisting of an outer casing and an inner casing, and is capable of creating high-quality sand piles. There is a sand pile creation device that can be used.

This sand pile construction device includes a hollow outer casing, an exciter disposed above the outer casing so that it can be raised and lowered via an air spring, and an upper end fixed to the exciter. an inner casing whose lower part is suspended in the outer casing, the air spring is filled with pressurized air to integrally fix the exciter and the outer casing; The outer casing (including the inner casing) penetrates into the ground due to the vertical vibration of the casing. Then, the pressurized air in the air spring is gradually released and the edge between the exciter and the outer casing is cut to prevent the vibration of the exciter from being transmitted to the outer casing. The sand in the outer casing is compacted by moving only the inner casing up and down by the vibration of the exciter, to prevent the ground from being agitated by the vibrations transmitted to the surrounding ground.
Next, the air spring is again filled with pressurized air to propagate the vibrations of the exciter to the outer casing, and the outer casing is pulled out, and the above-mentioned operations are repeated to create a sand pile in the ground. However, since the above-mentioned sand pile construction apparatus uses a vibration exciter, a shock absorber is required. In addition, in order to prevent vibrations from being transmitted to the ground around the outer casing by cutting the edge between the outer casing and the inner casing, we temporarily stopped pulling out the outer casing, and then moved only the inner casing up and down to remove the outer casing. It is necessary to compact the sand, which has the disadvantage of poor work efficiency.

The present invention aims to provide a sand pile construction device that improves the above-mentioned drawbacks. EMBODIMENT OF THE INVENTION Hereinafter, two examples of the embodiments of the sand pile construction apparatus according to the present invention will be described with reference to the accompanying drawings.

1 to 8 show a first embodiment of the sand pile building apparatus of the present invention.

The sand pile construction device of the present invention in this embodiment is as follows:
An upper frame 100 and a lower frame 1, guide columns 10 and 11 whose upper and lower ends are fixed between the upper and lower frames 100 and 1, a lifting platform 12 mounted on the guide columns 10 and 11 so as to be able to rise and fall, and the upper frame. 1 unit
00 and a long-stroke upper air spring 4 and a lower air spring 400, which are interposed between the lower pedestal 1 and the lifting table 12, and serve as telescoping and lifting actuating means to expand and contract to raise and lower the lifting table 12 over a long stroke; Four H-steel fixed columns 13 extending downward from the lower surface of the lower frame 1, and a hollow outer casing 2 extending further downward from the lower end of the fixed columns 13.
and a rotary drive section 3 installed in the middle part of the fixed column 13, an upper end of which is rotatably attached to the rotary drive section 3, and a portion below the upper end thereof is inserted into the outer casing 2, and the lower end is attached to the outer casing 2. A hollow rotary tube 30 located below the lower end of the outer casing 2, an upper end fixed to the lifting platform 12, a portion below the upper end inserted into the rotary tube 30, and a lower end of the rotary tube 30. A lifting casing 5 located below the lower end of the rotary tube 30, a digging blade 31 attached to the lower end of the rotary tube 30, a vibrator 6 attached to the lower end of the lifting casing 5, and a vibrator 6 installed in the outer casing 2 to remove sand from the outer casing. 2 and a rotary tube 30, a hopper 7 is provided for a sand input/supply port for inputting and supplying sand.

The outer casing 2 has an upper end of a short rotating tube 32 rotatably attached to its lower end via a bearing member 20, and the short rotating tube 32 is integrally attached to the lower end of the rotating tube 30, and Short tube 32
The excavating blade 31 is spirally provided on the outer peripheral side surface of the excavator blade 31 in a leftward direction (counterclockwise direction) when viewed from above. Thus, the lower opening of the outer casing 2, that is, the short rotating pipe 3
The opening/closing shoe 23 is located at the sand outlet 22 at the bottom opening of 2.
When the outer casing 2 penetrates, it is closed to prevent earth and sand from entering the outer casing 2, and the outer casing 2
It is installed so that it can be opened and closed by a hinge mechanism 24 so that it is open when pulled out and does not interfere with the construction of the sand pile.

The rotary drive unit 3 includes a reducer 33 fixed to the fixed column 13 and two drive motors (the number is not particularly limited) 34 mounted on the reducer 33.
A reduction gear 33 and a drive motor 34 are connected to each other, and the upper end of the rotary tube 30 is rotatably attached to the reduction gear 33. A through hole (not shown) is provided in the reduction gear 33 so that the elevating casing 5 can be inserted into the rotating tube 30.

The rotary tube 30 has an outer diameter equal to that of the outer casing 2.
The inner diameter of the outer casing 2 is smaller than the inner diameter of the outer casing 2, and can rotate within the outer casing 2.

The lifting casing 5 has an outer diameter equal to that of the rotating tube 3.
It has a cylindrical shape smaller than the inner diameter of 0, and is configured to be able to rise and fall within the rotary tube 30, and its upper end is attached to the lower surface of the elevating table 12,
A portion below the upper end thereof is inserted into the rotary tube 30, and a lower end thereof is projected further downward than the opening shoe 23 of the outer casing 2, and the vibrator 6 is attached to the lower end.

The guide columns 10 and 11 consist of four large-diameter guide vibes 10 and four small-diameter guide vibes 11, two of each guide vibe, a total of four guide vibes, and the upper and lower ends are connected to the upper frame 100 and the lower frame 1. The upper and lower air springs 4 and 4 are fixed to the upper and lower air springs 4 and 4.
Make sure that the vertical expansion and contraction stroke of 00 is long enough.

Although the elevating table 12 is omitted in the drawing, a through hole through which the guide columns 10 and 11 can be inserted is provided.

As shown in FIGS. 2 to 5, the upper air spring 4 is of a so-called quintuple type, and includes two circular end plates 41 and a circular end plate with a diameter slightly smaller than that of the end plates 41. An appropriate number of intermediate plates 42, for example, 4 intermediate plates to form a
and an appropriate number, for example, five bellows 43 and a cushion ring 430, which are made of an elastic member such as rubber and have a four-striped bellows shape.

An engaging claw 410 that closely engages the end of the bellows 43 is protruded in an annular shape on one surface of the end plate 41, and a mounting hole 411 is appropriately provided at a location outside the engaging claw 410 of the end plate 41. establish. The intermediate plate 4
An engaging claw 420 that closely engages the end of the bellows 43 is provided on both sides of the end plate 41 in an annular shape having the same diameter as the engaging claw 410 of the end plate 41. Through hole 4 for air circulation in the center of
21, and four sets of guide arms 44 are provided at the outer peripheral end of the intermediate plate 42. This guide arm 44 is a substantially rectangular fixed plate 44 fixed to the outer peripheral end of the intermediate plate 42.
0, a substantially triangular slide plate 44, a semi-annular guide member 442 fixed to the slide plate 441, a fixing bolt 443 and a nut 444.
The fixing plate 440 is provided with two through holes 445 through which the fixing bolts 443 are inserted, and the slide plate 441 is provided with two through holes 445 through which the fixing bolts 443 are inserted.
The fixing plate 440 has a long hole 446 through which the
Two holes are provided so that the longitudinal direction of the elongated hole 446 corresponds to the radial direction of the intermediate plate 42, and the elongated hole 446 of the fixed plate 440 and the elongated hole 446 of the slide plate 441 are thus formed. At this point, the fixing bolts 443 and nuts 444 are tightened, and the slide plate 441 is attached to the fixing plate 440 so as to be able to slide slightly in the radial direction of the intermediate plate 42.

Then, the two end plates 41 are placed facing each other with an appropriate gap between them with the engaging claws 410 inside, and the four intermediate plates 42 are arranged between the two end plates 41, and The five bellows 43 are arranged between the plate 42 and the end plate 41 and between the intermediate plate 42 and the intermediate plate 42, and both ends of the bellows 43 are connected to the end plate 4.
The bellows 4 is tightly fitted into the engaging claw 410 of the intermediate plate 420 and the engaging claw 420 of the intermediate plate 42, or the engaging claw 420 of the intermediate plate 42 and the engaging claw 420 of the intermediate plate 42, respectively.
A cushion ring 430 is fitted into the trough 3, and a through hole 412 for air circulation is provided at the center of the lower end plate 41. Although the lower air spring 400 is not illustrated and described, it is a five-unit type similar to the upper air spring 4 described above.

The upper air spring 4 thus formed is attached to the lifting platform 12.
Two upper air springs 4 are interposed between the upper air spring 4 and the lower mount 1.
The upper and lower end plates 41 of the upper and lower end plates 41 are respectively fixed to the lifting table 12 and the lower frame 1,
2 are engaged with the guide struts 10 and 11, respectively, and a branch pipe (not shown) from the air circulation pipe (not shown) is connected to the through hole 412 for air circulation in the lower end plate 41 of the upper air spring 4. . Further, the lower air spring 400 is interposed between the lifting table 12 and the upper frame 100, and a branch pipe from the air distribution pipe is connected to the lower air spring 400. An air hose or the like (not shown) from a compressor (not shown) is connected to an air inlet and an air outlet provided in this air distribution pipe via a solenoid valve or the like (not shown).
By switching the solenoid valve or the like, air from the compressor is alternately pressed into and out of the upper air spring 4 and the lower air spring 400, so that the upper air spring 4 and the lower air spring 400 alternately expand and contract. The lifting platform 12 is configured to rise and fall between the upper mount 100 and the lower mount 1.

In addition, in the above-mentioned upper air spring 4 and lower air spring 400, the through hole 421 of the intermediate plate 42,
By passing a guide pipe or the like through a through hole (not shown) provided in the lifting platform 12 and the end plate 41 located on the lifting platform 12 side, horizontal vibration of the upper air spring 4 and the lower air spring 400 can be further prevented. be able to.

As shown in FIGS. 6 and 7, the vibrator 6 includes a head 60 fixed to the lower end of the inner casing 5, and a cylinder 62 having an upper flange fixed to the flange of the head 60 with bolts 61 or the like. It consists of a piston 63 slidably housed in the cylinder 62, and a hammer 65 fixed to the lower end of the piston 63 with a bolt 64,
The head 60 is provided with an air supply port 600 and a bifurcated air feed path 601, and the cylinder 62 is provided with two air feed paths 621 in the axial direction of the cylinder 62, which communicate with the air feed path 601 of the head 60. In addition, an air exhaust port 622 is provided in the cylinder 62.
A total of eight air holes are provided at four locations below the air feed passage 621, and an air insertion hole 630 is provided in the piston 63, so that the outer circumferential side of the piston 63 and the inner circumferential side of the cylinder 62 are connected to each other. A first air chamber 66 that communicates with the air supply path 621 of the cylinder 62 is provided in between, and a second air chamber 67 that communicates with the air insertion port 630 is provided within the piston 63. Supply port 600 of the head 60
The lower end of the air supply pipe 68 passed through the inner casing 5 is connected to the upper end of the air supply pipe 68, and an air hose or the like (not shown) from a compressor (not shown) is connected to the upper end of the air supply pipe 68. pipe 68
The hammer is configured so that it moves up and down when air is supplied through it. That is, when air is supplied through the air supply pipe 68, the air is supplied to the supply port 600,
The second
press fit into the air chamber 67 and push down the piston 63;
Along with this, the hammer 65 descends. piston 6
3 is lowered, the first air chamber 66 and the second air chamber 67 are closed, and the second air chamber 67 is opened through the insertion port 630.
When the discharge port 622 and the second air chamber 67 communicate with each other, the second air chamber 67
The air inside is discharged to the outside through the insertion hole 630 and the discharge port 622, and the air that is continuously supplied through the air supply pipe 68 passes through the supply port 600 and the supply paths 601 and 621 to the first air. 66 to push up the piston 63, and accordingly the hammer 65
rises. Thereafter, by repeating the above-described action, the hammer 65 moves up and down independently of the up and down movement of the elevating casing 5 by the air springs 4 and 400.

The sand pile construction device of the present invention in this embodiment is as follows:
The construction of the sand pile is as described above. Next, the construction work of the sand pile will be explained with reference to FIG.

(a) First, the sand pile construction device of the present invention is suspended from a leader via wire ropes, hangers, sheaves, etc. (not shown in the drawing), and is positioned at a predetermined position on the soft ground G to be improved. Next, the drive motor 34 is driven to rotate the rotary tube 30 in the direction of the arrow (to the left when viewed from above), and the outer casing 2, The rotary tube 30, the lifting casing 5, etc. are penetrated into the ground G to a required depth. At this time, only the rotating tube 30 and the short rotating tube 32 rotate, so the outer casing 2
And there is no risk that the elevating casing 5 will be twisted. Furthermore, since the outer casing 2, rotary tube 30, and lifting casing 5 are penetrated into the ground G by the rotation of the excavation blade 31, the inner and outer casings are penetrated faster than when the casing is penetrated by a vibro (exciter). It can be penetrated with almost no noise and vibration, and there is no need for a shock absorber. Further, since the opening/closing shoe 23 is closed when the inner and outer casings penetrate, there is no risk of dirt entering the outer casing 2.

(b) After penetrating the outer casing 2, rotating tube 30 and lifting casing 5 to the required depth by the operation in (a) above, the drive motor 34 is stopped and the sand is removed from the outer casing 2 and rotating tube 30 through the hopper 7.
Insert between.

(c), (d) Then, the upper air spring 4 and the lower air spring 400 are actuated alternately to move the elevating casing 5 up and down to compact the sand in the outer casing 2. That is, by raising and lowering the lifting platform 12 by alternately pressurizing and releasing air into the upper air spring 4 and the lower air spring 400, the ground G around the outer casing 2 is protected without being stirred. The lifting casing 5 moves up and down via the lifting table 12, and the sand in the outer casing 2 is compacted by the lifting casing 5, and the sand at the tip of the outer casing 2 is pushed out from the discharge port 22. Further, when air is supplied to the vibrator 6 through the air supply pipe 68, the hammer 65 moves up and down independently of the up and down movement of the elevating casing 5, and the elevating casing 5
The sand that has been pushed out and compacted is further compacted.

Then, the drive motor 34 is driven according to the amount of sand pushed out of the lifting casing 5, and the excavating blade 3 is
1 are rotated in the opposite direction, and the outer casing 2, rotating tube 30, and lifting casing 5 are gradually pulled out.

At this time, if the stroke length of the vertical movement of the elevating casing 5 is large, the amount of sand extruded by the elevating casing 5 will be large, and therefore the sand will come out well and sand piles can be created efficiently and quickly.

Furthermore, in the present invention, when the lifting casing 5 descends, the lower air spring 400 operates to forcibly push down the lifting casing 5.
The pressing force of the lifting casing 5 is simply the lifting platform 12.
This is extremely large compared to the weight of
That is, the lifting casing 5 is pushed down with a large force. Therefore, tamping and extrusion of sand is good.

As described above, according to the present invention, there is no need to stop pulling out the outer casing 2, so that work efficiency can be significantly improved.

Although omitted in the above embodiment, if a jet nozzle is provided in the lifting casing 5, sand is pushed out from the tip of the outer casing 2 by injecting air from this jet nozzle, and the lifting casing 5 is pushed out and tamped. In combination with the tamping of the vibrator 6, even stronger sand piles can be created quickly.

Further, since the opening/closing shoe 23 is open when the sand pile is being constructed, there is no risk of any hindrance to the construction of the sand pile.

(e) Repeat steps (c) and (d) above to create strong sand piles in soft ground G.

FIG. 9 is a partially cutaway front view showing a second embodiment of the sand pile building device of the present invention.

The sand pile building device of this embodiment uses a hydraulic cylinder 8 as a telescopic lifting/lowering operating means. That is, the hydraulic cylinder 8 is mounted on the upper frame 100.
while fixing the base end of the hydraulic cylinder 8.
The tip of the piston rod 81 is fixed to the upper surface of the lifting table 12. This hydraulic cylinder 8
When pressure oil is supplied to the head chamber (not shown) of
The piston rod 81 moves forward, and the lifting casing 5 rises via the lifting table 12. Furthermore, when pressure oil is supplied to a rod chamber (not shown) of the hydraulic cylinder 8, the piston rod 81 retreats, and the elevating casing 5 rises via the elevating platform 12.

Note that when pressure oil is supplied into the head chamber, the oil in the rod chamber is discharged, and conversely, when pressure oil is supplied into the rod chamber, the oil in the head chamber is discharged.

Further, in this embodiment, the lower pedestal is also used by the main body of the reducer 33 of the rotary drive unit 3 and the top end of the outer casing 2.

As is clear from the above embodiments, the sand pile construction device of the present invention moves the elevator pipe up and down using the upper and lower lifting operation means to compact and discharge the sand in the outer casing while the sand pile is being moved outside. Since the casing is pulled up, it is easy to remove sand, and there is no need to stop pulling up the outer casing, which improves work efficiency. Furthermore, since no exciter is used, there is no need for a shock absorber, and there are fewer problems with noise and vibration. Furthermore, since only the rotary tube rotates, there is no risk that the outer casing, rotary tube, and elevating casing will be twisted. Further, when the elevating casing is lowered, the telescopic elevating and lowering operating means is activated to forcibly lower the elevating casing, so that the sand can be removed more quickly and the work efficiency is improved.

Note that, as a matter of course, the sand pile construction apparatus of the present invention is not limited to the above-mentioned embodiments.

[Brief explanation of the drawing]

1 to 8 show a first embodiment of the sand pile building device according to the present invention, FIG. 1a is a partially cutaway front view, and FIG. 1b is a line a-a in FIG. 1a. A sectional view, FIGS. 2 and 3 are a sectional view and a plan view of the air spring, and FIG. 4 is an enlarged view of a portion in FIG. 3.
Fig. 5 is an arrow diagram in Fig. 4, Fig. 6 is a longitudinal cross-sectional view of the air hammer, Fig. 7 a, b is an explanatory diagram of the operating state of the air hammer, Fig. 8 a, b, c, d, e is a construction work. It is an explanatory diagram. FIG. 9 is a partially cutaway front view showing a second embodiment of the sand pile building apparatus of the present invention. 1...Lower stand, 100...Upper stand, 10, 11
... Guide column, 12 ... Lifting platform, 2 ... Outer casing, 3 ... Rotation drive unit, 30 ... Rotation tube, 3
1...Drilling blade, 4...Upper air spring, 400...
Lower air spring, 5... Inner casing, 6... Vibrator, 7... Hopper, 8... Hydraulic cylinder.

Claims (1)

[Scope of Claims] 1. An upper pedestal and a lower pedestal, a guide column fixed between the upper pedestal and the lower pedestal, a lifting platform attached to the guide column so as to be able to rise and fall, the lifting platform, the upper pedestal, and a telescopic elevating and lowering means that is interposed between the lower pedestal or between the elevating table and the upper or lower pedestal and raises and lowers the elevating table; and a hollow outer casing extending downward from the lower pedestal; A rotary drive unit installed on either the upper mount, the lower mount, or the outer casing, and a hollow rotary member whose upper end is rotatably attached to the rotary drive unit and whose portion below the upper end is inserted into the outer casing. a lifting casing whose upper end is fixed to the lifting platform and whose portion below the upper end is inserted into the rotating tube; an excavation blade attached to the lower end of the rotating tube; A sand pile making device characterized by comprising a sand input and supply port between the outer casing and the rotary pipe. 2. The sand pile construction apparatus according to claim 1, wherein the telescopic elevating and lowering operating means has a longer telescopic stroke length to increase the stroke length of the vertical movement of the elevating casing pipe. 3. The telescopic elevating and lowering operating means comprises an upper air spring interposed between the lower pedestal and the elevating table, and a lower air spring interposed between the upper pedestal and the elevating table. The sand pile construction device according to scope 1 or 2. 4. The sand pile construction device according to claim 1 or 2, wherein the telescopic elevating and lowering operating means is a cylinder interposed between the upper frame and the elevating table. 5. The sand pile construction device according to claim 1, 2, 3, or 4, wherein the inner casing has a vibrator at the lower end.