JPS5826451B2 - 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 solidified into soft ground by gradually pulling out the chemical injection pipe from the soft ground while stirring and mixing the injected chemical solution and the soil with a rotating stirring blade. Pillar areas are formed and the 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 Three examples of the soft ground improving apparatus of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 6 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.
4 is a partial plan view of the air spring, FIG. 5 is an enlarged view of the V section in FIG. 4, and FIG. 6 is a view taken in the direction of the ■ arrow in FIG. 5.

The soft ground improvement device of the present invention in this embodiment includes an upper pedestal 100 and a lower pedestal 1, and a guide column 20.21 whose upper and lower ends are fixed to the upper pedestal 100 and the lower pedestal 1.
A mount 3 is attached to the guide columns 20 and 21 so as to be able to rise and fall, and is interposed between the mount 3 and the lower pedestal 1, and serves as a mount push-up means for pushing up the mount 3 over a long stroke. Air spring (hereinafter simply referred to as earth air spring).

) 4, and a pressing air spring (hereinafter simply referred to as a lower air spring) interposed between the mounting base 3 and the upper frame 100 as a mounting base pressing means for pressing down the mounting base 3 over a long stroke.

) 400, four drive motors 50 mounted on the mounting base 3, and the upper ends of the four drive motors 50 are linked via a reducer 51, and the lower part of the upper end is connected to the mount 1. Two auger rotation shafts 52 are inserted and suspended, an auger head 53 is attached to the lowermost ends of these two auger rotation shafts 52, and the auger head 53 is suspended between the two auger rotation shafts 52 from the lower mount 1. a hollow stirring shaft 7 equipped with a
A chemical liquid injection tube 6 is inserted into the stirring shaft 7 and has a chemical liquid injection port 60 at its upper end, and a chemical liquid injection nozzle 61 at its lower end.
A first stirring blade 81 and a second stirring blade 82 are provided on the lower ends of the stirring shaft 7 and the two auger rotating shafts 52, respectively, so as not to interfere with each other.

The guide columns 20 and 21 are made up of four large-diameter guide pipes 20 and four small-diameter guide pipes 21, two of each of which are fixed on the pedestal 1 as a set. Therefore, the upper and lower enclosing strokes of the lower air spring 400 and the earth air spring 4 are made sufficiently long.

Although the mounting base 3 is omitted in the drawing, the guide column 2
A through hole is provided through which the wires 0 and 21 can be inserted.

As shown in FIGS. 3 to 6, the upper air spring 4 is
It is a three-part type, and consists of two circular end plates 41, two circular intermediate plates 42 with a diameter slightly smaller than the diameter of the end plates 41, and an elastic member such as rubber. It includes three bellows 43 and a cushion ring 30 in the shape of four bellows.

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 inside the 0,
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.
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. The fixing bolts 443 and nuts 444 are tightened in the through holes 445 of the fixing plate 440 and the elongated holes 446 of the slide plate 441, and the 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.

The two end plates 41 are placed facing each other with an appropriate gap between them with the engaging claws 410 inside, and the two end plates 41 are placed between the two end plates 41.
Two intermediate plates 42 are disposed, and the three bellows 43 are disposed between the intermediate 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. The engagement claw 410 of 41 and the engagement claw 420 of the intermediate plate 42 or the engagement claw 420 of the intermediate plate 42 and the engagement claw 420 of the intermediate plate 42
A cushion ring 430 is fitted into the valley of the bellows 43, and a through hole 412 for air circulation is provided at the center of the lower end plate 41.

Although the drawing of the lower air spring 400 is omitted, its structure is the same as that of the earth air spring 4 described above, and includes two circular end plates 41 and a diameter slightly smaller than that of the end plates 41. It is a two-piece type having one circular intermediate plate 42, two bellows 43 made of an elastic member such as rubber and having a four-line bellows shape, and a cushion ring.

The thus formed lower air spring 400 and upper air spring 4
are interposed between the mount 3 and the upper mount 100 and the lower mount 1, and the upper and lower end plates 41 of the upper and lower air springs 4.400 are fixed to the mount 3 and the upper and lower mounts 100 and 1, respectively. , the guide member 442 of the upper and lower air springs 4,400 is engaged with the guide columns 20 and 21, respectively, and the through hole 4 for air circulation in the lower end plate 41 of the upper and lower air springs 4,400
12 is provided with an air supply port and an air exhaust port 45, and an air hose or the like (not shown) from a compressor (not shown) is connected to the air supply port and the air exhaust port 45, and a solenoid valve or the like (not shown) is connected to the air supply port and the air exhaust port 45. By switching this solenoid valve, etc., which is connected through the mount 3, air from the compressor is forced into or removed from the upper and lower air springs 4,400, and the upper and lower air springs 4,400 expand and contract. is configured so that it rises and falls between the upper and lower frames 100 and 1.

The first stirring blades 81 are provided at the lower ends of the two auger rotating shafts 52 in two stages, upper and lower, in a cross shape, and are slightly shifted vertically so as not to interfere with each other.

Further, the second stirring blade 82 is connected to the upper first stirring blade 81.
It forms a frame shape that surrounds it so that it does not interfere with the

Note that the stroke length of the vertical movement of the first stirring blade 81, that is, the stroke length of the vertical movement of the mounting base 3 by the vertical air springs 4, 400, is such that the first stirring blade 81 and the second stirring blade 82 are vertically aligned with each other. To the extent that they do not interfere with each other.

The soft ground improving apparatus of the present invention in this embodiment has the above-mentioned configuration, and the soft ground improving construction work thereof will be explained below.

First, a hose or the like (not shown) from a chemical liquid feeding device (not shown) is connected to the chemical liquid inlet 60, and the soft ground improvement device of the present invention is mounted on the crane leader (not shown) so that it can be raised and lowered. Then, drive the drive motor 50 to rotate the two auger rotation shafts 5.
2. Rotate the first stirring blade 81 and the auger head 53, and the auger head 53 rotates the two auger rotation shafts 52,
Stirring shaft 7, chemical injection tube 6, first stirring blade 81. The second stirring blade 82 is penetrated into the soft ground to a required depth.

Next, while rotating the two auger rotation shafts 52,
Press air into and out of the upper and lower air springs 4.400.

Then, the upper and lower air springs 4° 400 can be expanded and contracted, and the longest stroke of the upper and lower air springs 4, 400 is such that both ends of the bellows 43 do not come off the engagement claws 410 and 420.

), the mount 3 moves up and down between the upper and lower mounts 100 and 1 via the vertical air springs 4,400, and the two auger rotating shafts 52 move up and down via the mount 3, thereby causing the first agitation. The wings 81 move up and down while rotating.

In this state, by injecting a chemical liquid such as cement milk from the injection nozzle 61, the first stirring blade 81, which moves up and down between the second stirring blades 82 while rotating, stirs and mixes the chemical liquid and the soft disk.

At this time, the vertical air spring 4,400 has three or two stages of bellows 43 closely engaged between the end plate 41 and the intermediate plate 42 and between the intermediate plates 42 and 42. , its vertical expansion and contraction strokes are long, so the first
The vertical stroke of the stirring blade 81 becomes longer, so that the chemical solution and the soft ground are stirred and mixed closely, and the lower air spring 400 is activated when the auger rotation shaft 52, the first stirring blade 81, etc. are lowered, so that the auger rotation shaft 52, the first stirring blade 81, etc., is applied to the drive motor 50, reducer 51, and mounting base 3.
Compared to the push-down blade due to the mere weight of the blade,
Therefore, the soft ground and the chemical solution are well stirred and mixed, and an improved ground with excellent strength can be obtained.

In addition, since the soil air spring 4 is guided by guide columns 20 and 21 fixed to the frame 1 of the soft ground improvement device via guide arms 44, even if the air spring 4 curves during a long stroke, its Okinawa direction will not deviate. There is no risk that this will happen.

Furthermore, although omitted in the drawing, the lower air spring 4
Similarly to the above-mentioned soil air spring 4, the guide arm of the spring 00 is guided by the guide column so that it does not shift in the direction perpendicular to the Okinawa direction even when a long stroke curve is taken.

Then, as described above, while rotating and moving the first stirring blade 81 up and down to stir and mix the chemical liquid and the soft ground, the two auger rotation shafts 52 of the soft ground improvement device of the present invention, the stirring shaft 7, the chemical liquid By pulling out the injection pipe 6, the first and second stirring blades 81, 82, 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.

FIG. 7 is a front view showing a second embodiment of the soft ground improvement device of the present invention.

The soft ground improvement device of the present invention in this embodiment is configured to rotate two auger rotating shafts 52 and move the stirring shaft 7 up and down.

That is, both upper and lower ends of the guide column 21 are fixed between the fixed base 10 fixed at the center of the lower base 1 and the upper base 100,
A mounting base 3 is attached to the guide column 21 so as to be movable up and down, and a mounting base 3 is mounted between the mounting base 3 and the upper frame 100 and the fixed base 10.
A continuous lower air spring 400 and a double upper air spring 4 are interposed, and the upper end of the stirring shaft 7 is fixed to the mounting base 3. On the other hand, a drive motor 50 is mounted on the lower frame 1. Two auger rotation shafts 5 are connected to a drive motor 50 via a reducer 51.
The upper ends of 2 are connected.

Note that the same reference numerals in the drawings are the same as in FIGS. 1 to 6.

As a result, the first stirring blade 81 of the rotary shaft 52 rotates, and the second stirring blade 82 of the stirring shaft 7 moves up and down between the upper and lower first stirring blades 81, thereby removing the soft ground and the chemical solution. At the same time, the soft ground and the chemical solution are well stirred and mixed by the pressing blade of the lower air spring 400 when the stirring shaft 7 and the second stirring blade 82 descend.

The stroke length of the vertical movement of the second stirring blade 82 is set to such an extent that it does not interfere with the first stirring blades 81 in two stages, upper and lower.

In the first and second embodiments described above, the chemical solution injection tube 6 is inserted into the stirring shaft 7, but this chemical solution injection tube 6 is inserted into the auger rotation shaft 52. Also good.

In addition, a first stirring blade 81 or a second stirring blade 82 is attached to the stirring shaft 7.
A vibrator that generates vertical vibration or horizontal vibration separately from the vertical vibration may be installed.

FIG. 8 is a front view showing a third embodiment of the soft ground improvement device of the present invention.

The soft ground improvement device of the present invention in this embodiment has a single earth auger (auger rotating shaft 52) and does not include a stirring shaft.

That is, a guide column 21 is fixed between the upper and lower frames 100 and 1, a mounting base 3 is attached to this guide column 21 so as to be movable up and down, and a fixed base 10 and an upper frame fixed at the center of the upper surface of this mounting base 3 are attached. A double lower air spring 400 and a double soil air spring 4 are respectively interposed between the lower surface of the mount 3 and the lower mount 1, and a drive motor 50 is mounted on the mount 3. The upper end of an auger rotating shaft 52 is connected to this drive motor 50 via a speed reducer 51, and a chemical liquid injection tube 6 is inserted through this auger rotating shaft 52.

Note that the same reference numerals in the drawings are the same as in FIGS. 1 to 6.

Since the soft ground improving apparatus of the present invention in this embodiment has the above-described configuration, the same effects as in the first and second embodiments described above can be obtained.

That is, when the auger rotating shaft 52 and the like descend, the lower air spring 400 is activated, and the pressing blade of the lower air spring 400 stirs and mixes the soft ground and the chemical liquid well.

Although the third embodiment described above is not equipped with a stirring shaft, the upper end of the stirring shaft is fixed to the lower pedestal 1, and the stirring blades are attached to the lower end of the stirring shaft on the auger rotation shaft 52. The stirring blades 81 and the stirring blades 81 may be provided in a protruding manner so as not to interfere with each other.

Also, an auger rotation shaft 52, a drive motor 50, a reducer 51
is installed on the lower stand 1, while the stirring shaft is fixed on the mounting stand 3,
The auger rotating shaft 52 may be rotated to move the horizontal stirring shaft up and down.

In the first, second, and third embodiments described above, air springs were used as the mount pushing means and the mount pushing down means, but air jacks, hydraulic jacks, hydraulic cylinders, etc. may also be used.

The upper and lower frames 100 and 1 and the mounting base 3 include plate-shaped ones as well as trapezoidal ones.

As is clear from the above embodiments, the soft ground improving device of the present invention is configured such that the auger rotating shaft or stirring shaft is moved up and down by the mounting table pushing means and the mounting table pressing means. Alternatively, when the agitation shaft is lowered, the mount push-down means is activated, and the push-down blade of the lower telescopic elevating actuation means has the effect that the soft ground and the chemical are well mixed and agitated.

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

[Brief explanation of drawings]

Figures 1 to 6 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.
4 is a partial plan view of the air spring, FIG. 5 is an enlarged view of the V section in FIG. 4, and FIG. 6 is a view taken in the direction of the ■ arrow in FIG. 5. FIG. 7 is a front view showing a second embodiment of the soft ground improvement device of the present invention. FIG. 8 is a front view showing a third embodiment of the soft ground improvement device of the present invention. 1... lower mount, 100... upper mount, 2
0, 21...Guide support column, 3...Mounting base, 4...Upper air spring (mounting base pushing up means)
, 400...Lower air spring (mounting base pressing means)
, 6... Rotating chemical liquid injection tube, 60... Chemical liquid inlet, 61... Injection nozzle, 81...
...First stirring blade, 82...Second stirring blade.

Claims (1)

[Scope of Claims] 1. An upper pedestal and a lower pedestal, a guide column fixed between the upper and lower pedestals, a mount mounted on the guide column so as to be able to rise and fall, and a space between the mount and the lower pedestal. Intervening in
a mount push-up means for pushing up the mount; a mount push-down means interposed between the mount and the upper frame to push down the mount; 1
a book or two or more auger rotation shafts or stirring shafts; a stirring blade protruding from the lower end of the auger rotation shaft or the lower end of the stirring shaft;
A soft ground improvement device characterized by comprising a chemical liquid injection pipe having a chemical liquid inlet at the upper end and a chemical liquid injection nozzle at the lower end. 2. The stroke length for pushing up and down the mounting base of the mounting base pushing up means and the mounting base pushing down means is made large enough to prevent the stirring blades of the auger rotation shaft and stirring shaft from interfering with each other vertically, and the auger rotation shaft or The soft ground improvement device according to claim 1, characterized in that the stroke length of the vertical movement of the stirring shaft is increased.