JPS5825131B2 - Soft ground improvement equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soft ground improvement device that improves soft ground by injecting and stirring a chemical solution such as mortar, cement milk, or slaked lime into the soft ground in order to enhance the bearing capacity of the soft ground. It is something.

Conventional soft ground improvement equipment of this type has a drive source mounted on a pedestal, the upper end of a chemical injection tube is connected to the drive source, and the chemical injection tube is inserted through the pedestal and hangs down, thereby injecting the chemical liquid. A chemical injection port is provided at the upper end of the tube, a chemical injection nozzle and a stirring blade are provided at the lower end, and an auger head is attached to the lowest end of the chemical injection tube.

The operation will be explained below. First, the auger head is rotated through the chemical injection pipe to penetrate the soft ground to the required depth, and then the chemical liquid supplied into the chemical injection pipe from the chemical injection port is injected into the soft ground. A chemical solution is injected into the ground from a chemical injection nozzle, and the chemical solution is mixed with the soil by a rotating stirring blade while the chemical solution injection pipe is gradually pulled out of the soft ground. Solidified columnar areas are formed and soft ground is improved.

However, the above-mentioned conventional soft ground improvement equipment stirs and mixes the chemical solution and soil only by rotating the stirring blade, so it is not possible to stir and mix the chemical solution and soil evenly and sufficiently.
Therefore, the required ground strength cannot be efficiently obtained.

Therefore, a soft ground improvement device was developed that uses an air spring or a crank mechanism and a bevel gear to rotate and raise and lower a chemical injection tube, thereby stirring and mixing the chemical and soil by rotating and raising and lowering the stirring blades. .

However, since this soft ground improvement device uses an air spring or a crank mechanism and a bevel gear to move the chemical injection tube up and down, it is not possible to move the chemical injection tube up and down over a long stroke. There is not much difference when comparing the agitation mixing efficiency of the chemical solution and the soil with that of the one that only stirs the soil.

In view of the above-mentioned points, the present invention aims to provide a soft ground improvement device that can thoroughly and thoroughly stir and mix a chemical solution and soil.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Two of the embodiments of the soft ground improvement device of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 9 show a first embodiment of the soft ground improvement device of the present invention, with Figure 1 being a front view, Figure 2 being a side view, and Figure 3 being a side view.
The figure is a sectional view taken along the line ■-■ in Fig. 1, Fig. 4 is a partial sectional view of the air spring, Fig. 5 is a sectional view taken along the v-v line in Fig. 1, and Fig. 6 is an enlarged section of the ■ part in Fig. 5. 7 is a view taken in the direction of the ■ arrow in FIG. 6, FIG. 8 is a sectional view of the air hammer, and FIG. 9 a1b is an explanatory diagram of the operation of the air hammer.

The soft ground improvement device of the present invention in this embodiment includes a pedestal 1 and a guide column 20.2 whose lower end is fixed to the pedestal 1.
1, a mounting base 3 mounted on the guide struts 20 and 21 so as to be movable up and down, a stopper 22 fixed to the upper end of the guide struts 20 and 21, and interposed between the pedestal 1 and the mounting base 3, an air spring 4 that expands and contracts to move the mounting base 3 up and down over a long stroke; and a drive motor 5 mounted on the mounting base 3.
The upper end of the drive motor 50 is connected to the drive motor 50 via a speed reducer 51, and the lower part of the upper end is inserted into the pedestal 1 and hangs down, and a chemical liquid inlet 60 is connected to the upper end via a swivel joint 52. A chemical liquid injection nozzle 6 is provided at the lower end.
1, a protection tube 62 fitted onto the rotary chemical injection tube 6, an auger head 63 attached to the lowermost end of the protection tube 62, and an auger head 63 that is suspended from the mounting base 3. The air vertical vibrator 7 is installed to hang down between the two rotary chemical injection tubes 6 by a lower pipe 79, and the air vertical vibrator and the lower end of the protective tube 62 are arranged so that they do not interfere with each other. A first agitation blade 81 and a second agitation blade 82 are provided that protrude from the top.

The guide struts 20 and 21 consist of four large-diameter guide pipes 20 and four small-diameter guide pipes 21, two each of which are fixed on the pedestal 1 as a set of four. Therefore, the vertical expansion and contraction stroke of the air spring 4 is made sufficiently long.

Although the mounting base 3 is omitted in the drawing, the guide column 2
Provide a through hole through which 0.21 mm can be inserted.

As shown in FIGS. 4 to 7, the air spring has two circular end plates 41 and an appropriate number of circular plates, for example, an intermediate number of three plates, each having a slightly smaller diameter than the end plates 41. It is provided with a plate 42, an appropriate number of bellows 43, for example four bellows 43, and a cushion ring 30, which are made of an elastic member such as rubber and have a 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.

Engagement claws 420 that closely engage the ends of the bellows 43 are protruded on both sides of the intermediate plate 42 in an annular shape having the same diameter as the engagement claws 410 of the end plate 41, and the engagement claws of the intermediate plate 42. 42
A through hole 421 for air circulation is provided in the center of the 0-side inside,
On the other hand, four sets of guide arms 44 are provided at the outer peripheral end of the intermediate plate 42.

This guide arm 44 includes a substantially rectangular fixed plate 440 fixed to the outer peripheral end of the intermediate plate 42 and a substantially triangular sliding plate 44.
, a semi-annular guide member 442 fixed to the slide plate 441, a fixing bolt 443 and a nut 444.
Tokaranasi, the fixing bolt 443 is attached to the fixing plate 440.
Two through-holes 445 are provided in the slide plate 441 through which the fixing bolts 443 can be inserted, and elongated holes 446 through which the fixing bolts 443 can be inserted correspond to the through-holes 445 of the fixing plate 440 and are arranged in the longitudinal direction of the elongated holes 446. Two fixing bolts 443 and nuts 444 are provided so that the radial direction of the intermediate plate 42 coincides with the radial direction of the intermediate plate 42, and the fixing bolts 443 and nuts 444 are tightened in the through holes 445 of the fixed plate 440 and the elongated holes 446 of the slide plate 441. Slide plate 4
41 is attached to the fixed plate 440 so as to be slightly slidable 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 three intermediate plates 42 are arranged between the two end plates 41, and Board 4
2 and the end plate 41 and between the intermediate plate 42 and the intermediate plate 42, and both ends of the bellows 43 are engaged with the engaging claw 410 of the end plate 41 and the intermediate plate 42. Claw 4
20 or the engaging claws 420 of the intermediate plate 42 and the engaging claws 420 of the intermediate plate 42, respectively, and a cushion ring 430 is fitted into the valley of the bellows 43, and the lower end plate 41
A through hole 412 for air circulation is provided in the center.

Two air springs 4 thus formed are interposed between the mounting base 3 and the mount 1, and the upper and lower end plates 41 of the air springs 4 are attached to the mounting base 3.
and the pedestal 1, the guide members 442 of the air spring 4 are engaged with the guide columns 20 and 21, respectively, and an air circulation pipe (not shown) is inserted into the through hole 412 for air circulation in the lower end plate 41 of the air spring 4. Connect the other branch pipe (not shown).

An air hose or the like (not shown) from a compressor (not shown) is connected to an air supply port and an air exhaust port provided in this air distribution pipe via a solenoid pulp or the like (not shown).

By switching the solenoid valve, etc., air from the compressor is injected into or released from the air spring 4, and the air spring 4 expands and contracts, thereby causing the mounting base 3 to rise and fall between the pedestal 1 and the stopper 22. Configure it to do so.

As shown in FIGS. 8 and 9, the air vertical vibrator 1 includes a head 70 fixed to the lower end of a hanging pipe 79;
It consists of a cylinder 72 whose upper flange is fixed to the flange of the head 70 by bolts 71 or the like, and a piston 73 slidably housed in the cylinder 72. Feeding lower 0
1, and an air feed path 721 communicating with the air feed path 701 of the head 70 is connected to the cylinder 72.
In addition to providing two air discharge lowers 22 in the axial direction of the cylinder 72, two air discharge lowers 22 are provided at four locations below the air feed passage 721, eight in total, and an air insertion lower 30 is provided in the piston 73. , a first air chamber 76 is provided between the outer circumferential side of the piston 73 and the inner circumferential side of the cylinder 72, and the first air chamber 76 communicates with the air supply path 721 of the cylinder 72;
A second air chamber 17 is provided within the piston 73 and communicates with the air insertion lower 30.

The lower end of an air supply pipe 78 is connected to the supply port 100 of the head 70, 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 78.
When air is supplied through the air supply pipe 78, the piston 73 moves up and down.

That is, when air is supplied through the air supply pipe 78, the air is supplied to the supply lower 00. The piston 73 is press-fitted into the second air chamber 77 through the feed passage 701.72L insertion lower 30.
descends.

The piston 73 is at the bottom, the first air chamber 76 and the second air chamber 77
When the second air chamber 77 and the discharge lower 22 communicate with each other via the insertion lower 30, the air in the second air chamber 77 is discharged to the outside through the insertion lower 30 and the discharge lower 22. Air is continuously supplied via the air supply pipe 78 to the supply lower 00. The piston 73 is forced into the first air 76 through the feed passages 701 and 721 and rises.

Thereafter, the above-described action is repeated to move the piston 73 up and down independently of the up and down movement of the hanging pipe 79 by the air spring 4.

The soft ground improvement apparatus of the present invention in this embodiment has the above-described construction, and the soft ground improvement work will be described below.

First, a hose or the like (not shown) from a chemical liquid supply device (not shown) is connected to the chemical liquid inlet 60, and the soft ground improvement device of the present invention can be freely raised and lowered on a crane (not shown). and position it at a predetermined position on soft ground, and then drive the drive motor 50 to connect the two rotating chemical injection tubes 6. Protection tube 62° Second stirring blade 82 and auger head 6
The auger head 63 rotates the two rotating chemical injection tubes 6. Protection tube 62. Air vertical vibrator7. First stirring blade 81. The second stirring blade 82 is penetrated into the soft ground to a required depth.

Once the two rotary chemical liquid injection tubes 6 and the like have penetrated to the required depth, while rotating the two rotary chemical liquid injection tubes 6,
Air is forced in and out of the air spring 4, and the air vertical vibrator 7 is operated.

Then, the air spring 4 expands and contracts between the position shown by the solid line in FIGS. 1 and 2 and the position where the mount 3 hits the stopper 22. The position where the mount 43 hits the stopper 22, that is, the longest stroke is: Both ends of the bellows 43 should not come off the engagement claws 410 and 420.

), the second stirring blade 82 moves up and down while rotating through the two rotary chemical injection pipes 6, and the first stirrer 81 of the air vertical vibrator 7 moves up and down while vertically vibrating through the hanging pipe T9.

In this state, by injecting a chemical liquid such as cement milk from the injection nozzle 61, the first stirring blade 81 that moves up and down while vertically vibrating and the second stirring blade 82 that moves up and down while rotating stir the chemical liquid and the soft ground. Mix.

At this time, since the air spring 4 has four stages of bellows 43 closely engaged between the end plate 41 and the intermediate plate 42 and between the intermediate plates 42 and 42, the vertical expansion and contraction stroke thereof is Long, therefore the first. Since the vertical stroke of the second stirring blades 81 and 82 is long, the chemical solution and the soft ground are stirred and mixed closely, and improved ground with high strength is obtained.

In addition, since the air spring 4 is guided by the guide column 2021 fixed to the frame 1 of the soft ground improvement device via the guide arm 44, even if the air spring 4 expands and contracts during a long stroke, the direction of expansion and contraction may deviate. There is no danger6
Then, as described above, the first stirring blade 81 is moved up and down while vertically vibrating, and the second stirring blade 82 is rotated and moved up and down to stir and mix the chemical solution and the soft ground. Two rotating chemical injection tubes6. Protection tube 62. First and second stirring blades 81, 82. By pulling out the air vertical vibrator 7 and the auger head 63 from the ground, a columnar region solidified by the chemical solution is formed in the soft ground, thereby improving the soft ground.

10 to 13 show a second embodiment of the soft ground improvement device of the present invention, in which FIG. 10 is a partial front view, FIG. 11 is a sectional view taken along line )11-M in FIG. Figure 12 is a vertical cross-sectional view of the horizontal vibrator, and Figure 13 is XI in Figure 12.
-XIII line sectional view.

The soft ground improvement device of the present invention in this embodiment uses a horizontal vibrator 9 instead of the air vertical vibrator 1.

This horizontal vibrator 9 has a pointed metal fitting attached to the tip of an elongated cylindrical casing 92, a drive motor 94 is installed inside the casing 92, and an eccentric shaft 96 is supported, and the eccentric shaft 96 is connected to the drive motor. By driving the drive motor 94 and rotating the eccentric shaft 96, horizontal vibration can be obtained.

In the above embodiment, a long stroke air spring 4 was used, but a long stroke hydraulic cylinder or the like may also be used.

As is clear from the above embodiments, the soft ground improvement device of the present invention has the effect of being able to easily stir and mix the soil of the soft ground and the chemical solution without any effort.

Note that, as a matter of course, the soft ground improvement device of the present invention is not limited to the above-mentioned embodiments.

[Brief explanation of drawings]

Figures 1 to 9 show a first embodiment of the soft ground improvement device of the present invention, with Figure 1 being a front view, Figure 2 being a side view, and Figure 3 being a side view.
The figures are a sectional view taken along the line ■-■ in Fig. 1, Fig. 4 is a partial sectional view of the air spring, Fig. 5 is a sectional view taken along the -v line in Fig. 1, and Fig. 6 is an enlarged section of the ■ part in Fig. 5. Figure 7 is a cross-sectional view of the air hammer, and Figure 9 is a cross-sectional view of the air hammer.
Diagram a. b is an explanatory diagram of the operation of the air hammer. 10 to 13 show a second embodiment of the soft ground improvement device of the present invention, FIG. 10 is a partial front view, FIG. 11 is a sectional view taken along the line XI-XI in FIG. 10, and FIG. The figure is a vertical cross-sectional view of the horizontal vibrator, and Figure 13 is the xut in Figure 12.
-xm line sectional view. 1... Frame, 20.21... Guide column, 3...
Mounting base, 4... Air spring, 50... Drive motor, 6
... Rotating chemical liquid injection tube, 60... Chemical liquid injection port, 61.
... Injection nozzle, 63 ... Auger head, 7 ... Air vertical vibrator, 81 ... First stirring blade, 82 ... Second
Stirring blade, 9...horizontal vibrator.

Claims (1)

[Claims] 1. A pedestal, a guide column whose lower end is fixed to the pedestal,
A mount mounted on the guide column so that it can be raised and lowered; a telescopic actuator that is interposed between the mount and the mount and expands and contracts to move the mount up and down over a long stroke; and a drive mounted on the mount. a drive source, and one or two screws whose upper ends are connected to the drive source, whose lower ends are inserted into the frame and hang down, and whose upper ends are provided with chemical liquid injection ports, and whose lower ends are provided with chemical liquid injection nozzles. The above-mentioned rotary chemical liquid injection tube, an auger head attached to the lowermost end of the rotary chemical liquid injection tube, a vibration means hanging down from the mounting base, and the vibration means and the lower end of the rotary chemical liquid injection tube. A soft ground improvement device comprising a first agitation blade and a second agitation blade that protrude so as not to interfere with each other. 2. The expansion/contraction actuation means includes two end plates, an appropriate number of intermediate plates, and an appropriate number of extensible bellows, and the ends of the bellows are arranged on one side of the end plates and on both sides of the intermediate plate. Engagement claws that closely engage the end plate or the intermediate plate are provided protrudingly, and a through hole for air circulation is provided inside the engagement claw of the intermediate plate, and a guide arm is provided on the outer peripheral side of the intermediate plate. , the two end plates are placed facing each other with an appropriate gap between them with the engaging claws inside, and the appropriate number of intermediate plates are arranged between the two end plates, and between the intermediate plate and the end plate, and The appropriate number of bellows is arranged between the intermediate plates, and both ends of the bellows are connected to the engagement claw of the end plate and the engagement claw of the intermediate plate, or to the engagement claw of the intermediate plate and the engagement claw of the intermediate plate. 2. The soft ground improvement device according to claim 1, wherein the guide arms of the intermediate plates of the long-stroke air springs are closely engaged with each other and are guided by the guide columns.