JP2002316170A - Solid-liquid separation method in classification of earth and sand and apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid-liquid separation method in the classification of earth and sand capable of easily separating a sand material from earth and sand containing moisture or the like after classification to effectively utilize the same as a building material and capable of reducing the amount of dredged earth and sand disposed for landfilling, and an apparatus using the same. SOLUTION: Water and, silt and clay contained in water are sucked and discharged by a pump 4 with a float 3 while storing sand, water, and silt and clay contained in water discharged after classification in a hopper and sand S in the hopper 2 is discharged by opening the valve 7 disposed at the lower end of the hopper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation method and apparatus for classifying earth and sand for separating water, silt and clay contained in sand after being classified by a centripetal separator or a hydrocyclone.

[0002]

2. Description of the Related Art Conventionally, when classifying earth and sand with a centripetal separator, for example, a Laval type separator or a hydrocyclone, water is contained in the classified sand in order to supply slurryed earth and sand. At the same time, there is a problem that silt and clay are also included in the water.

[0003] On the other hand, in recent years, the number of places that regulate the extraction of sand from the standpoint of nature protection has increased, and the number of places for reclaiming large amounts of dredged soil has been limited. There is a demand for recycling it into construction materials and the like.

[0004]

SUMMARY OF THE INVENTION According to the present invention, sand materials contained therein are easily separated from sediment containing water and the like after classification, and are effectively used as construction materials and disposed for landfill. Provided is a method and apparatus for solid-liquid separation in classification of sediment capable of reducing the amount of dredged sediment to be performed.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method for storing silt and clay contained in water and water by a pump with a float while storing sand, water and silt and clay contained in the water discharged after classification in a hopper. The method comprises a solid-liquid separation method for classifying earth and sand in which clay is sucked and discharged, and sand in the hopper is discharged by opening a valve provided at a lower end of the hopper.

The present invention also provides a pump with a float for sucking and discharging water, silt and clay contained in water, into a hopper for storing sand, water and silt and clay contained in water discharged after classification. And a solid-liquid separation device in the classification of earth and sand in which a valve for discharging the sand in the hopper is provided at the lower end of the hopper, and the present invention further comprises a plurality of the above hoppers, and A sand level sensor is installed at the top of the hopper, and when the sand level sensor detects the sand accumulated in the first hopper, the next hopper valve is closed and the next hopper contains sand, water and water. Multiple sills and clay are stored, and water and silt and clay contained in the water are sucked and discharged by a pump equipped with a float, and the sand in the hopper is discharged by a valve. Consisting solid-liquid separator in the classification of sediment provided with a switching valve device capable of sequentially switching par.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic layout of a solid-liquid separation apparatus to which a solid-liquid separation method for classification of earth and sand according to one embodiment is applied. It is a side view, in this embodiment, after removing large foreign matter by vibrating the dredged earth and sand conveyed by appropriate means, water is added in a mud tank, and the unit volume weight of the mud is appropriately adjusted. After the adjustment, the centrifugal separator 21 or the like shown in FIG. 2 classifies the dredged soil.

As shown in FIG. 2, a centrifugal separator 21 shown in FIG. 2 flows hydrated dredged soil from a tangential inlet 16, the dredged soil becomes vortex-like, and heavy solids are centrifugally driven. , Settles slowly while hitting the inner wall of the separation tube, and accumulates in the lower collection chamber 19,
The liquid that has descended as a rotating vortex flows into the lower guide blade mechanism 2
The solid-liquid separation (secondary separation) by 0, the solid-free fluid rises sharply by the vortex at the center, is discharged from the discharge port 17 to the outside, and the solid deposited in the collection chamber 19 is removed as necessary. The liquid is discharged from the drain port 18 periodically or continuously.

In place of the centripetal separator 21 of FIG. 2, for example, a Laval separator, which classifies the above-mentioned dredged soil, FIG.
The hydrocyclone 5 may be used as shown in FIG. 2. The hydrocyclone 5 is a device that promotes sedimentation by using centrifugal force instead of gravity. As shown, the hydrocyclone 5 includes a cylindrical portion and a conical portion. There is an inlet 16 tangentially in the part, an overflow outlet 17 which is an outlet of the fine slurry is in the upper center of the cylindrical part, and the lower end of the conical part is
Underflow drain port 1 which is the outlet for coarse slurry
It is 8.

The sand discharged after being classified by the centrifugal separator 21 or the hydrocyclone 5 or the like as described above contains water and also contains some silt and clay mixed with the water. While the sand, the water and the silt and the clay contained in the water discharged as indicated by the arrow F are stored in the hopper 2 of FIG. 1, the silt and the clay contained in the water and the water are pumped by the pump 4 with the float 3 provided in the hopper 2. Is discharged to a drain pit 6, and the sand S stored in a lower portion of the hopper 2 is discharged to a sand pit 8 via a screw conveyor 9 by opening a valve 7 provided at a lower end of the hopper 2. The sand S in the sand storage tank 8 is effectively used.

The water level in the hopper 2 rises with the addition of sand, water, silt and clay contained in the water into the hopper 2, but the pump 4 is equipped with the float 3 so that the pump 4 Due to the buoyancy of the float 3, the float 3 can always be located on the water surface in the hopper 2.

Next, FIGS. 4 to 8 are explanatory views of an operation procedure for continuously discharging sand S in another embodiment of the solid-liquid separation device in the classification of earth and sand according to the present invention. First, as shown in FIG. 4, two or a plurality of hoppers 2 are arranged, a sand level sensor 10 is arranged above each of the hoppers 2, and a pump 4 with a float 3 is provided for each. It is arranged.

Therefore, sand, water, silt and clay F contained in the water discharged after being classified by the centrifugal separator 21 shown in FIG. 1 are mixed with the lower end of the first hopper 2 shown in FIG. Is introduced into the hopper 2 with the valve 7 closed.
While storing the sand, the water, and the silt and clay contained in the water as shown in FIG. 5, the pump 4 with the float 3 discharges the silt and the clay contained in the water as surplus water W.

When the sand S accumulates in the hopper 2 and the sand surface sensor 10 detects the sand surface as shown in FIG. 6, the valve 7 at the lower end of the next hopper 2 shown in FIG.
The sand, the water, and the silt and the clay F contained in the water classified by the soil separator 1 are stored in the next hopper 2 shown in FIG. The pump 4 with water discharges water and surplus water W of silt and clay contained in the water.

In the meantime, the sand 7 is discharged by opening the valve 7 of the hopper 2 shown in the first part (A), and the sand surface of the sand S of the hopper 2 shown in the next part (B) is When the surface level sensor 10 detects, the switching valve 12 of the switching device is switched.

By sequentially repeating the operations shown in FIGS. 4 to 8, the sand S can be continuously discharged.

It is sufficient that the number of the hoppers 2 is at least two. However, if it is necessary to clean the hoppers during the operation, three or more hoppers 2 are arranged and the hoppers 2 are sequentially arranged. The storage and discharge of the sand S is repeated, and the storage of the sand S in the hopper 2 can be skipped and stored in the next hopper 2 at the time of cleaning.

[0018]

According to the solid-liquid separation method and apparatus for classifying earth and sand of the present invention described above, since the pump is provided with a float, the pump can always be positioned on the water surface in the hopper. Easily separate water and silt and clay and sand material from water and other soil that has been classified by a centripetal separator or liquid cyclone, and use the sand material effectively as a construction material and as a landfill. The dredged soil to be disposed can be reduced.

Further, by arranging a plurality of hoppers constituting the apparatus of the present invention via the switching device, sand can be automatically and continuously discharged in the operation according to the solid-liquid separation method of the present invention. .

[Brief description of the drawings]

FIG. 1 is a schematic layout side view of a solid-liquid separation device according to an embodiment of the present invention.

FIG. 2 is an illustrative schematic side view of a centripetal separator applicable to the method and apparatus of the present invention.

FIG. 3 is a schematic side perspective view for explaining a hydrocyclone that can be used in place of the centripetal separator of FIG. 2;

FIG. 4 is an explanatory diagram of storing discharged waste in a first hopper after classification in a solid-liquid separation device according to another embodiment of the present invention.

FIG. 5 is a diagram illustrating a situation following FIG. 4 in which surplus water is discharged while accumulating waste.

FIG. 6 is a continuation explanatory diagram of the switching of the switching valve and the discharge of sand, following FIG. 5;

FIG. 7 is an explanatory diagram of a situation following FIG. 6, in which waste water is discharged while storing the discharged material in another hopper.

FIG. 8 is a view for explaining the switching of the switching valve and the discharge of sand, following FIG. 7;

[Explanation of symbols]

 2 Hopper 3 Float 4 Pump 7 Valve 10 Sand level sensor S Sand

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B03B 5/28 B03B 5/28 Z E02F 7/00 E02F 7/00 C (72) Inventor Takeshi Mineyoshi Tokyo 5th Yonbancho, Chiyoda-ku Toa Construction Industry Co., Ltd. (72) Inventor Taichi Nagasawa 5th Yonbancho, Chiyoda-ku, Tokyo Toa Construction Industry Co., Ltd. F term (reference) 4D015 BB01 CA10 FA12 FA19 4D071 AA41 AA53 AA62 AB04 AB13 BA06 BA13 BB03 BB12 CA01 CA05 DA03

Claims (3)

[Claims] Claims 1. While storing sand, water and silt and clay contained in water discharged after being classified in a hopper, a pump with a float sucks and discharges silt and clay contained in water and water, A solid-liquid separation method for classifying earth and sand in which sand in a hopper is discharged by opening a valve provided at a lower end of the hopper. 2. A pump with a float for sucking and discharging silt and clay contained in water and water is provided in a hopper for storing sand, water and silt and clay contained in water discharged after being classified. A solid-liquid separation device for classifying earth and sand, wherein a valve for discharging sand in the hopper is provided at a lower end of the hopper. 3. A plurality of hoppers according to claim 2,
A sand level sensor is placed above each hopper, and when the sand level sensor detects the sand accumulated in the first hopper, the valve of the next hopper is closed and the sand, water and water are supplied to the next hopper. Of silt and clay contained in water, and suction and discharge of water and silt and clay contained in water with a pump equipped with a float, and discharging of sand in the hopper with a valve can be switched sequentially with multiple hoppers. Solid-liquid separation device for classification of earth and sand provided with a switchable device.