JPH0783879B2 - Method and apparatus for dehydration of high hydrous soil - Google Patents

Description

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

"Problems to be solved by conventional techniques and inventions" Generally, the water content ratio of 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 is high. There are quite a few that are extremely high, and such high hydrated soil is treated as industrial waste, and in order to dispose of it, it is necessary to reduce at least the water content and treat it as ordinary residual soil.

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.

In addition, a high water content soil is placed in the drainage pit that has been conventionally installed in the ground, and the water content is drained to the bottom filtration layer composed of crushed stone or reticulated pipe and pumped up with a water absorption pipe to reduce the water content ratio Although a method of treating as residual soil is also known, in this method, since it is natural gravity drainage, the drainage distance and time are long and the efficiency is low, and the filter 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 dehydration tank 4
The airtight box 6 attached to the vertically movable and laterally movable transport press-fitting machine 8 is inserted into the highly water-containing soil with its lower opening facing downward, and at the same time, the airtight box 6 is turned downward. A method for dehydrating a highly water-containing soil by penetrating a plurality of strainer pipes 9 that are projecting, applying vibration to a highly water-containing soil to exude water, and vacuum-sucking the water by the strainer pipe 9 and discharging it to the outside. Is proposed.

The present invention also relates to a dehydration tub 4 which is oscillated by a vibrator 2, an airtight box 6 which is attached to a transport press-fitting machine 8 which can be moved vertically and laterally, and an open bottom portion of which is provided. The present invention proposes a dewatering device for highly hydrous soil, which comprises a plurality of strainer pipes 9 which are provided so as to project downward inside and can be vacuum-sucked by a vacuum pump 11.

Further, the present invention provides a dehydrating device for a high water content soil in which a part of the peripheral wall of the dehydrating tank 4 is provided with an openable / closable soil discharging door 5, and the dehydrating tank 4 is rotatable with the soil discharging door 5 side facing downward. Is proposed.

Further, the present invention provides a dehydrator for a high water content soil in which the strainer tube 9 is a double porous tube having inner and outer sides, and a fine water-permeable material 10 is removably loaded between the inner and outer porous tubes 9a and 9b. It is a proposal.

[Operation] The airtight box 6 is penetrated into a part of a large amount of high-moisture content soil put in the dehydration tank 4 with its lower opening facing downward, and a strainer projecting downward into the airtight box 6 The pipe 9 is penetrated and the dehydrated soil is moved from the vibrator 2 to exude water, and the exuded water strainer pipe 9 surrounded by the airtightness of the airtightness of the airtightness is concentrated by vacuum suction. Since the water is discharged to the inside, the entire water content of a portion of the high-moisture content soil surrounded by the airtight box body 6 can be efficiently and surely dehydrated, and can be economically treated as ordinary residual soil with a reduced water content ratio.

Further, since the airtight box 6 can be moved by the transport press-fitting machine 8, it is possible to efficiently dehydrate a large amount of highly water-containing soil while sequentially moving the penetration position of the airtight box 6.

Further, since the dewatering tank 4 is rotatable with the soil discharge port 5 facing downward, the confidential soil box 6 and the strainer pipe 9 are pulled out, and the dewatered residual soil is quickly and automatically discharged from the dewatering tank. be able to.

Furthermore, since the strainer tube 9 is a double porous tube inside and outside, and the fine water-permeable material 10 is detachably loaded between the inner and outer porous tubes 9a and 9b, the clogging is reduced and clogging occurs. Also, 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 7 show a dehydrating apparatus and a dehydrating method according to the present invention. As shown in FIG. 3, a vibrating table 3 having a vibrating device 2 therein is mounted on a base 1 with one end serving as a rotation fulcrum O. A dehydration tub 4 is installed on the upper side by a hydraulic jack or the like so as to be rotatable by a required angle, and the upper part of the dehydration tub 4 is open.

The dewatering tank 4 is formed in a box shape, and an earth discharging door 5 which is rotatable downward with a lower edge thereof as a rotation fulcrum P is attached to a peripheral wall of the vibrating table 3 on the rotation fulcrum O side.

Then, the airtight box 6 is carried into the dehydration tub 4 through the opening at the upper part thereof so that the airtight box 6 penetrates into a large amount of the dehydrated soil S which is a high water content soil put into the dehydration tub 4. Has become.

The airtight box 6 is formed in a box shape with the lower part opened downward,
On the upper surface, a carrier press-fitting machine 8 which is vertically movable and laterally movable, such as a movable arm of a backhoe installed on a fixed base 7 (Fig. 1) or a moving vehicle 7 '(Fig. 2) such as a crawler, is attached. Inside, a plurality of strainer tubes 9 are provided so as to project downward from the upper surface.

Each strainer tube 9 is composed of a perforated double tube having a sharp tip, and as shown in FIGS. 6 and 7, the gap between the perforated inner and outer tubes 9a and 9b is compared with non-woven fabric or fine particles such as sand. A fine water-permeable material 10 is inserted and removed freely, and its upper end is a flexible vacuum hose 12 of a vacuum pump 11.
Open / close valve such as solenoid valve connected to the water absorption branch pipe 12 '
It is removably fixed to a joint pipe 14 having 13 by a screwing type joining means.

Note that the strainer pipe 9 may not be fixed to the airtight box 6, but may be vertically moved by a jack and airtightly penetrate into the upper surface of the box.

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

First, a required amount of dehydrated treated soil S, which is high-moisture content soil, is put into the dehydration tank 4 from its upper opening by a clam backhoe or the like.

Next, the airtight box 6 is placed on the dehydrated soil S in the dehydration tank 4.
Is moved up and down or front and rear and right and left by the transport press-fitting machine 8 to be positioned at a required position, and then is lowered by the transport press-fitting machine 8 and penetrates into the dehydrated soil S together with the strainer pipe 9.

In this case, the air inside the airtight box 6 is removed to the outside through the strainer tube 9 as the airtight box 6 is press-fitted.

When the strainer tube 9 is provided on the airtight box 6 so as to be able to move up and down, the strainer tube 9 is inserted into the dehydrated soil S and then the strainer tube 9 is lifted and jacked to remove the dehydrated soil S.
Penetrate into.

On the other hand, after or before the airtight box body 6 and the strainer pipe 9 have penetrated, the dehydration tank 4 is vibrated (including rocking) by the vibrating table 3.
By doing so, the moisture of the dehydrated soil inside is forced out and released.

As a means for vibrating the dehydrated soil S, the vibrator 2 may be attached to the upper part of the airtight box 6 to vibrate the airtight box 6.

In this state, the vacuum pump 11 is driven to suck the inside of each strainer pipe 9 through the vacuum hose 12 and each water absorption branch pipe 12 ', and the released water is filtered while being filtered by the water permeable material 10 and discharged to the outside. To do.

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 9, water is easily sucked into the strainer tube 9, and dehydration is performed extremely efficiently. become.

After performing the dehydration step of the predetermined portion of the dehydrated soil S in the dehydration tank 4 for the required time in this manner, the airtight box 6 and the strainer pipe 9 are pulled out from the dehydrated soil by the transport press-in machine 8 to dehydrate them. After moving to another position on the treated soil S and again moving and adjusting the airtight box 6 by the transport press-fitting machine 8 up and down, front-rear, left-right, and positioning at the required position, the transport press-fitting machine 8
Then, it descends and penetrates into the dehydrated soil S together with the strainer pipe 9.

Then, the same steps as described above are repeated over the entire dehydrated soil S for uniform dehydration.

If necessary, when the dehydration process is repeated, only the opening / closing valve 13 of the water absorption branch pipe 12 ′ connected to the strainer pipe 9 corresponding to the position where the dehydration situation is partially bad is opened and the others are partially closed. It is also possible to intensively dehydrate.

In this way, after the dehydrated soil S is dehydrated to reduce the water content ratio to the reference value or less, the vibrating table 3 is rotated upward together with the dehydration tank 4 and tilted toward the soil discharge door 5, and at the same time. While shaking the dehydration tank 4 with the vibrating table 3 as necessary, the soil discharging door 5 is opened and the water is automatically discharged to the outside.

When the strainer tube 9 is clogged, clean water is pumped into the strainer tube 9 for cleaning, and when the clogging is severe due to long-term use, the water permeable material 10 is replaced.

[Advantages of the Invention] As described above, according to the present invention, an airtight box mounted on a transport press-fitting machine that can be vertically moved and moved laterally is placed in a highly water-containing soil placed in a dehydration tank with its lower opening facing downward. While penetrating, penetrating a strainer tube projecting downward inside the airtight box, vibrating the dehydration tank to exude water, and sucking this water in vacuum by the strainer tube and discharging it to the outside. Therefore, due to the synergistic action of forced exudation of water by vibration of the dehydration tank, airtightness inside the airtight box, and strengthening of water absorption by vacuum suction, the water content of the high hydrous soil in the part that penetrates the airtight box can be efficiently concentrated. Dehydrate well and reliably and uniformly, and while changing the penetration positions of the airtight box and strainer pipe in sequence, the same dehydration process is repeated closely throughout the dehydrated soil to reduce the water content uniformly. It can be treated economically as ordinary waste left over.

In addition, a soil discharge door that can be opened and closed is provided on part of the peripheral wall of the dehydration tank,
Since the dehydration tank is rotatable with the soil discharge door side facing downward, the dehydrated soil can be quickly and automatically discharged from the dehydration tank.

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 Therefore, the water-permeable material can be easily washed, and the water-permeable material can be easily replaced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a dehydration process by the dehydrator of the present invention, FIG. 2 is a side view showing another embodiment of the dehydrator of the present invention, and FIG. 3 is a dehydration process by the dehydrator of the present invention. FIG. 4 is a side view showing the same, FIG. 4 is a plan view of the same, FIG. 5 is a longitudinal sectional view of an airtight box according to the present invention, FIG. 6 is a lateral sectional view of a strainer tube according to the present invention, and FIG. Is. 1 ... base, 2 ... vibrator, 3 ... vibration table, 4 ... dewatering tank, 5 ... soil door, 6 ... airtight box, 7 ... fixed stand,
7 '... moving vehicle, 8 ... transport press-fitting machine, 9 ... strainer tube, 9a ... perforated inner tube, 9b ... perforated outer tube, 10 ... permeable material, 11 ... vacuum pump, 12 ... vacuum Hose, 12 ′
…… Water absorption branch pipe, 13 …… Open / close valve, 14 …… Joint pipe, S …… Dehydration treated soil.

Claims (4)

[Claims] 1. An airtight box attached to a vertically movable and laterally movable transport press-fitting machine is inserted into a high-moisture content soil placed in a dehydration tank with its lower opening facing downward, and at the same time, It is characterized in that a plurality of strainer pipes protruding downward are penetrated into the inside, vibration is applied to the high water content soil to exude water, and the water is vacuum suctioned by the strainer pipe and discharged to the outside. Dehydration method of high hydrous soil. 2. A dehydration tank oscillated by a vibrating machine, an airtight box having a lower opening attached to a carrier press-fitting machine that can be moved vertically and horizontally, and a lower box inside the airtight box. A dehydrating device for high hydrous soil, comprising: a plurality of strainer tubes that are provided so as to project and can be vacuumed by a vacuum pump. 3. A drainage door which is openable and closable is provided on a part of the peripheral wall of the dehydration tank, and the dehydration tank is rotatable with the discharge door side facing downward. Dehydrator for high hydrous soil. 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, wherein a fine water-permeable material is removably loaded between the inner and outer porous tubes.