JPH0783880B2 - Dehydrator for high water content soil - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for dewatering water in a high water content soil such as sludge and excavated mud by a mud shield construction method to reduce the water content ratio.

“Problems to be solved by conventional techniques and inventions” Generally, the water content ratio is extremely high in the residual soil discharged from civil engineering works such as cohesive soil containing silt by excavation, sludge by dredging, excavated mud by the mud shield method. There are many high ones, and such high hydrated soil is treated as industrial waste, and it is necessary to reduce the water content ratio at least and treat it as ordinary residual soil in order to dispose of it.

As a conventional method for treating high hydrous soil, the method of mixing and stirring solidifying materials such as cement and lime to solidify is implemented, but in order to treat a large amount of high hydrous soil, the material cost of the solidifying material is increased. However, when a strong alkali material such as cement, which is inexpensive, is used as the solidifying material, there is a problem of alkali pollution pollution.

Also, conventionally, high water content soil was put in the drainage pit provided in the ground, the water content was drained to the bottom filtration layer composed of crushed stone or reticulated pipe, and the water content ratio was lowered by pumping it up with a water absorption pipe. Although it is also known to treat the soil as ordinary soil, this method uses natural gravity drainage, so the drainage distance and time are long and inefficient, and the filtration tank is easily clogged, and its maintenance is not easy. There was a problem.

Furthermore, conventionally, excavated soil containing muddy water was stored inside a soil tank in which a depressurizing drain pipe having a through hole for allowing muddy water to pass through was horizontally installed and fixed between a plurality of vibrating devices mounted on the inner wall to vibrate. There is also known a method for treating the remaining excavated soil by vibrating the excavated residual soil by the vibration of the device and then sucking the muddy water separated from the remaining excavated soil through the through hole in the depressurization drain pipe (Japanese Patent Laid-Open No. Sho-06-27) 62-50514).

However, in this method of treating residual soil after excavation, since the upper part of the soil tank is open to the atmosphere, air freely flows inside the residual soil, the water absorption efficiency of the decompression drain pipe is extremely poor, and the decompression drain pipe is Since it is horizontally erected and fixed between multiple vibration devices installed on the inner wall of the tank, if you try to absorb a large amount of residual excavated soil evenly by enlarging the soil tank, the decompression drain pipe will be placed horizontally on the earth tank. In addition to arranging a large number in the direction, it is necessary to arrange in a multi-stage also in the depth direction. Therefore, there is a problem that it is not easy to discharge the excavated soil after the water absorption treatment.

"Means for Solving Problems" In order to solve the above-mentioned conventional problems, the present invention is directed to a vibration generator 2
Is provided with a lid plate 9 that can be opened and closed freely and that closes the upper opening of the dehydration tank 4 in an airtight manner.
A plurality of strainer pipes 11 that can be slidably inserted in an airtight manner are installed in the dehydration tank 4 at required intervals, and a vacuum hose 16 of a vacuum pump 15 is connected to the rear end of the strainer pipes 11. We propose a dehydrator for high water content soil.

Further, according to the present invention, the cover plate 9 is installed on the mount 6 which is slidably movable along the base plate 4'provided around the upper opening of the dehydration tank 4, and the strainer pipe 11 is jacked on the cover plate 9
This is to propose a dehydrator for high water content soil that can be installed vertically.

Further, the present invention provides a dehydrating device for high water content soil, wherein a part of the peripheral wall of the dewatering tank 4 is provided with a soil discharging port which is opened and closed by a soil discharging door 5, and the dewatering tank is rotatable with the soil discharging port facing downward. It is a proposal.

Further, the present invention provides a dehydrator for a high water content soil in which the strainer pipe 11 is a double porous pipe having inner and outer sides, and a fine water-permeable material 12 is removably loaded between the inner and outer porous pipes 11a and 11b. It is a proposal.

[Operation] Since the entire inside of the dehydration tub 4 is hermetically sealed by the cover plate 9, the internal pressure decreases as the vacuum suction by each strainer pipe 11 becomes easier, and the moisture is easily sucked into the strainer pipe 11, which is extremely efficient. You will be dehydrated.

Further, since a plurality of strainer pipes 11 that can be slidably inserted into the lid plate 9 are installed inside the lid plate 9, the strainer pipes 11 can be pulled out from the dehydrated treated soil S after performing the dehydration process for a required time and smoothly. Can be discharged to.

Further, the lid plate 9 is a base plate 4 ′ provided around the upper opening of the dehydration tank 4.
Since it is installed on the mounting base 6 which can be slidably moved along, it is possible to appropriately change the insertion position of the slender pipe 11 to more efficiently and uniformly dehydrate the entire high water content soil.

A drainage opening that is opened and closed by a soil removal door 5 is provided on a part of the peripheral wall of the dehydration tank 4, and the dehydration tank 4 is rotatable with the discharge outlet facing downward so that the dehydrated residual soil is dehydrated. Can be easily and automatically discharged from.

Further, since the strainer pipe 11 is a double porous pipe inside and outside, and the fine water-permeable material 12 is detachably loaded between the inner and outer porous pipes 11a and 11b, the water permeability suitable for the soil nature of the high water content soil is obtained. Material
By selecting 12 and loading it, clogging can be reduced, and even if clogging occurs, the water-permeable material can be easily washed or replaced.

"Example" Hereinafter, an example of the present invention shown in the drawings will be described.
1 to 9 show a dehydrator according to the present invention. As shown in FIG. 2, a vibrating table 3 having a vibrating device 2 therein is mounted on a base 1 as a hydraulic jack with one end serving as a rotation fulcrum O. For example, the dehydration tank 4 is installed on the upper side so as to be rotatable by a required angle.

The dehydration tank 4 is formed in a box shape, and a flange plate-like base plate 4 ′ is provided around the upper opening thereof, and the vibrating table 3 is also provided.
On the peripheral wall on the side of the rotation fulcrum O, the earth discharging door 5 which is rotatable downward with the lower edge thereof as the rotation fulcrum P is attached.

On the base plate 4'of the dehydration tub 4, as shown in FIGS. 4 and 5, a rectangular frame-shaped movable table 6 is moved forward and backward and left and right via casters 7 whose height can be adjusted by fluid pressure such as oil or air. It is movably mounted, and a seal packing 8 is attached to the lower end on the outer periphery of the moving table 6.
The caster 7 is provided with an airtight wall 6'attached thereto.
Is lowered and the seal packing 8 is pressed against the base plate 4'to seal the periphery of the moving base 6, and the casters 7 are raised to move the seal packing 8 away from the base plate 4 '. The table 6 is configured to be freely movable.

As shown in FIG. 3, one end of the movable table 6 has a rotation fulcrum Q.
As a cover plate 9, which is rotatable upward, is airtightly mounted on its outer peripheral edge via a seal packing 10, and a plurality of strainer tubes 11 are vertically inserted through the flat plate part.

Each strainer tube 11 is composed of a perforated double tube having a sharp tip, and as shown in FIGS. 6 and 7, the perforated inner and outer tubes 11a and 11b.
A relatively fine-grained water-permeable material 12 such as a non-woven fabric or fine particles such as sand selected according to the soil property of the dehydrated soil S is removably loaded in the gap between them, and the upper end of the cover plate 9 Each of them is attached to a pedestal 14 which is movably supported by a lifting jack 13 installed above.

The upper end of each strainer pipe 11 is branched into a plurality of water suction main pipes 17 connected to a vacuum hose 16 from a vacuum pump 15 through an opening / closing valve 18 such as a solenoid valve as shown in FIGS. To the water absorption branch pipes 17 '.

The periphery of the insertion hole 19 of the strainer tube 11 provided on the cover plate 9 is
As shown in FIG. 8, packings 21 and 2 provided on the outer periphery of the upper portion of the strainer pipe 11 and the airtight plate 20 and the peripheral edge of the hole facing each other.
It is hermetically sealed by crimping 1 ', or hermetically sealed by a sealing material 22 having an elastic seal clip in the form of an oil seal as shown in FIG.

Next, a method of dehydrating using the dehydrating apparatus configured as described above will be described.

First, the lid plate 9 is opened in the dehydration tank 4 and a required amount of dehydrated treated soil S is supplied from the upper opening by a clam backhoe or the like.
Then, the high water content soil is charged and the cover plate 9 is closed.

Next, after moving the movable table 6 together with the cover plate 9 forward and backward and left and right on the base plate 4'to position it at a required position, the lifting jack 13 is lowered to move together with the frame 14 and the strainer pipe 11
Is lowered and is inserted into the dehydration treated soil S in the dehydration tank 4 up to the vicinity of its bottom surface.

At this time, at the same time, the casters 7, which are automatically acted on by hydraulic pressure, descend to fix the moving table 6 on the base plate 4'in an airtight manner.

After the insertion of the strainer pipe 11, the dehydration tub 4 is vibrated (including rocked) by the vibrating table 3 to forcibly exude and release the water content of the high hydrous soil inside.

In this state, the vacuum pump 15 is driven to suction the inside of each strainer pipe 11 through the vacuum hose 16, the water absorption main pipe 17, and each water absorption branch pipe 17 ', and the released water is permeable material.
Inhale while passing through 12 and discharge to the outside.

At this time, since the entire inside of the dehydration tank 4 is hermetically sealed, the internal pressure decreases as the vacuum suction is performed by each strainer tube 11, water is easily sucked into the strainer tube 11, and dehydration is performed very efficiently. become.

After performing the dehydration process for the required time in this way, the elevating jack 13 is moved up to remove the strainer pipe 11 from the dehydrated soil S.
After pulling out from the inside, the casters 7 are raised to move the moving table 6 to another position on the base plate 4 ', and at the same time as inserting the strainer pipe 11 into another position in the dehydrated soil S in the same manner as described above. , The caster 7 descends and positions and fixes in an airtight manner, and in this state, the same vacuum suction operation is repeated again to uniformly dehydrate the entire water content of the treated soil S.

If necessary, this dehydration step may be further repeated, and the opening / closing valve of the water absorption branch pipe 17 'connected to the strainer pipe 11 corresponding to the position where the dehydration condition is partially bad when the dehydration step is repeated. It is also possible to open only 18 and close the others to provide partial intensive dehydration.

In addition, a plurality of strainer pipes 11 configured as described above are also inserted into the dehydration treated soil S from the peripheral wall of the dehydration tub 4 in the same manner, and the strainer pipes 11 are arranged more densely in a state where they are crossed vertically and horizontally or front and back and left and right. It is also possible to efficiently dehydrate, or to install a drainage layer that combines the same water-permeable material as the strainer pipe 11 and a perforated iron plate on the bottom surface and side surfaces, and dehydrate by vacuum suction from this drainage layer. .

After the water content ratio is reduced to the reference value or less by performing the dehydration process in this way, the strainer pipe 11 is pulled out, and the vibrating table 3 is rotated upward together with the dehydration tank 4 while inclining to the soil discharge door 5 side. Also, at the same time, the soil discharging door 5 is opened and the treated soil S is automatically discharged outside while vibrating the dewatering tank 4 by the vibrating table 3 if necessary.

When the strainer pipe 11 is clogged, clean water is pumped into the strainer pipe 11 for cleaning, and when the clogging is severe due to long-term use, the water permeable material 12 is replaced.

[Advantages of the Invention] As described above, according to the present invention, the high water content soil is put in the dehydration tank and hermetically sealed with the lid plate, and the strainer pipe is penetrated into the high water content inside the dehydration tank, and Vibration is applied to exude and release water, and this water is vacuum sucked by the strainer tube and discharged to the outside.Therefore, the vibration of the dehydration tank forces the water to exude and the inside is made airtight and the vacuum suction enhances the water absorption effect. By the action, it is possible to efficiently and uniformly dehydrate the water content of the highly hydrated soil and economically treat it as ordinary residual soil having a reduced water content ratio.

In addition, the strainer tube was installed on a mounting base that was slidable along the base plate provided around the upper opening of the dehydration tank, and the strainer pipe was installed on this lid plate so that it could be raised and lowered by a jack. It is possible to change it easily and dehydrate the whole treated soil more densely and uniformly,
By pulling out the strainer tube from the soil after the dehydration treatment, the treated soil can be smoothly discharged without disturbing the strainer tube at the time of discharging the soil.

In addition, a drainage outlet that opens and closes with a drainage door is provided in a part of the peripheral wall of the dehydration tank, and this dehydration tank is rotatable with the discharge outlet facing downward, so that dehydrated soil can be quickly and automatically removed from the dehydration tank. Can be discharged.

In addition, the strainer tube is a double perforated pipe inside and outside, and by inserting a fine water-permeable material between the inner and outer perforated pipes so that it can be inserted and removed freely, clogging is reduced, and when clogging occurs, internal It is possible to easily wash the water-permeable material by pumping high-pressure water from it, and to easily replace the water-permeable material.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a dehydrator of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a side view of the same, and FIG. Partial vertical sectional view,
FIG. 5 is a partial vertical cross-sectional view showing the other embodiment, FIG. 6 is a horizontal cross-sectional view of the strainer tube according to the present invention, FIG. 7 is a vertical side view, and FIG. 8 is an airtightness of the strainer tube according to the present invention. FIG. 9 is a front view showing one mode of the mechanism, and FIG. 9 is a front view showing another mode thereof. 1 ... base, 2 ... vibrator, 3 ... vibration table, 4 ... dewatering tank, 4 '... base plate, 5 ... discharging door, 6 ... moving table,
6 '... airtight wall, 7 ... caster, 8 ... seal packing, 9 ... lid plate, 10 ... seal packing, 11 ... strainer tube, 11a ... porous inner tube, 11b ... porous outer tube, 12 ...
… Permeable material, 13 …… Lifting jack, 14 …… Stand, 15 …… Vacuum pump, 16 …… Vacuum hose, 17 …… Water absorption main,
17 '... water absorption branch pipe, 18 ... open / close valve, 19 ... insertion hole, 20 ...
… Airtight plate, 21,21 ′ …… Packing, 22 …… Sealant.

Claims (4)

[Claims] 1. A dewatering tank oscillated by a vibrator is provided with a lid plate that can be opened and closed to close an upper opening of the dewatering tank in an airtight manner, and the lid plate is slidably inserted into the dewatering tank. A dewatering device for high water content soil, wherein a plurality of possible strainer pipes are installed at required intervals, and a vacuum hose of a vacuum pump is connected to a rear end portion of the strainer pipes. 2. A cover plate is installed on a mounting base that is slidable along a base plate provided around the upper opening of a dehydration tank, and a strainer pipe is installed on the cover plate so as to be vertically movable by a jack. The dewatering device for high hydrous soil according to claim 2, characterized in that. 3. A drainage opening which is opened and closed by a drainage door is provided in a part of the peripheral wall of the dehydration tank, and the dehydration tank is rotatable with the discharge opening facing downward. Dehydration device for high-hydrated soil described. 4. The strainer tube is a double porous tube having inner and outer sides,
3. A dehydrating device for highly hydrous soil according to claim 2, characterized in that a fine water-permeable body is removably loaded between the inner and outer porous tubes.