JP3238729B2 - Dehydration equipment for high hydrous soil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatering apparatus for dehydrating the water content of a high hydrous soil such as sludge and excavated mud by a muddy water shield method to reduce the water content.

[0002]

2. Description of the Related Art In general, there are a lot of remnants such as clayey soil containing excavated silt, sludge by dredging, and excavated mud by mud shield method, which have a very high water content. High hydrous soil is treated as industrial waste, and it is necessary to treat it as ordinary residual soil at least by reducing the water content in order to dump it.

As a conventional method of treating a high hydrous soil, a method of mixing and stirring a solidifying material such as a cement type or a lime type to solidify has been practiced. A large amount of cost is required as a material cost of the solidifying material, and there is a problem of alkali pollution when using a cheap strong alkali material such as cement as the solidifying material.

In addition, a high water content soil is placed in a conventional drainage pit provided in the ground, and the water content is drained to a bottom filtration layer formed of crushed stone or a mesh pipe and pumped up by a water absorption pipe to thereby reduce the water content. It is also known to reduce the amount of waste water and treat it as ordinary surplus soil.However, since this method uses natural gravity drainage, the drainage distance and time are long, the efficiency is low, and the filtration tank is easily clogged. There were problems such as difficulty.

[0005] Therefore, the applicants first put high-hydrated soil in the dewatering tank and hermetically seal it. At the same time, many strainer pipes penetrate into the high-hydrated soil inside to apply vibration to the dewatering tank. We have developed a dewatering device that exudes water and discharges this water to the outside by vacuum suction through a strainer tube, and has already filed an application as Japanese Patent Application No. 63-178342.

However, in the vacuum suction method using a strainer tube, the portion that absorbs water in contact with the high water content soil is the outer peripheral portion of the strainer tube, so the water absorption range is limited, and the water absorption efficiency is poor. Although the dewatering effect of the central part of the high hydrous soil is relatively good, there is a problem that the dewatering effect of the periphery is insufficient and the whole water cannot be uniformly dewatered.

[0007] Further, there is another problem that the dehydration efficiency is reduced when the inside is in a vacuum equilibrium state only by vacuum suction.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a conventional method using a solidifying agent, which results in high cost and pollution caused by alkali contamination, and a drainage pit having a bottom filtration layer has poor drainage efficiency, and requires maintenance and management. Another object of the present invention is to solve the problem that it is not easy, and that the method of vacuum suction using a strainer tube cannot be uniformly dehydrated as a whole.

[0009]

According to the present invention, a box-shaped dewatering tank 1 having an open upper end, filter plates 7 and 8 attached to the front and back surfaces, and a water intake port 11 'and an air supply port 13' inside the hollow. A plurality of dehydrating plates 6 suspended in parallel from above to the bottom surface of the dehydrating tank 1, and a water inlet 1 of the dehydrating plate 6.
Water suction pipes 11, 17, and 18, which are connected to the vacuum pump 1 'and vacuum suction from a vacuum pump ;
Extraction pipe is the pipe in communication with the air supply port 13 'of the dewatering plate 6 for introducing the atmosphere by vacuum suction into the dewatering plate 6 a vacuum is vacuum sucked by pump 13,19,2
0, a support rail 16 disposed horizontally above the dewatering tub 1 in the direction of juxtaposition of the dehydration plates 6, and supporting the upper end of the dehydration plate 6 via rollers 15, and a dehydration plate in the side of the dehydration tub 1. 6
The present invention proposes a dehydrating apparatus for high hydrous soil, comprising a pressurizing plate 5 installed to be able to advance and retreat in the parallel direction of the groups.

[0010]

The inside of the parallel dehydrating plates 6 is vacuum-sucked, and is located between the dehydrating plates 6 and 6 by the front and back filtering plates 7 and 8 which are in contact with the high hydrous soil S as a wide surface parallel to each other. The water in the high water content soil S having a small thickness is efficiently and uniformly suction-dewatered as a whole.

Further, the air supply port 1 is provided in the dehydrating plate 6 during vacuum suction.
By temporarily introducing the atmosphere from 3 'as needed by vacuum suction , the internal vacuum equilibrium state can be eliminated and dehydration can be performed continuously and reliably.

As the dehydration proceeds, the volume of the high hydrous soil S between the dehydration plates 6 and 6 shrinks, and a gap is formed between the dehydration plates 6 and the dehydration efficiency decreases. The group is pressed by the pressing plate 5 in the parallel direction, and the dehydrating plates 6 and 6 are pressed.
Reduce the spacing between.

[0013]

1 and 2 show an embodiment of the present invention. A dewatering tub 1 is formed in a box shape, and a vibrator 2 is attached to a required position on the outer surface thereof.
A jack 4 is provided on one or both inner surfaces of
3 is provided with a pressure plate 5 which moves forward and backward in the facing direction.

In the dewatering tank 1, a number of dewatering plates 6 are suspended in parallel at predetermined intervals in parallel to each other on the left and right sides, and a high hydrous soil S is filled between the dewatering plates 6 and 6.

The dewatering plate 6 is, for example, a rectangular hollow plate body on which a filter plate comprising a fine mesh plate 7 and a perforated plate 8 having an infinite number of small holes is attached to the front and back surfaces, as shown in FIG. A perforated plate 8, a net plate 7, and a window frame-shaped holding plate 10 are sequentially stacked on the front and back of a central rectangular frame 9, and the frame 9 has a water absorption port 11 'at its lower end from its upper end to its lower end. A pipe 11 is provided, and an air supply pipe 13 having an air supply port 13 'at the lower end is provided from the upper end to a bar 12 extending slightly below the pipe.

Each dewatering plate 6 has a suspension member 14 mounted on its upper part, and a support rail on the upper end of which a roller 15 rotatably supported around a horizontal axis is installed horizontally above the dewatering tank 1 in the left-right direction. The dehydrating plates 6 are mounted so as to be able to move freely and are hung on them, so that the dehydrating plates 6 can move in the parallel direction.

A flexible water-absorbing branch pipe 18 branched from a water-absorbing main pipe 17 connected to a vacuum pump is connected to the upper end of the water-absorbing pipe 11 of each dehydrating plate 6.
At the upper end of the air supply mains 1 that can be opened to the atmosphere via a valve
An air supply branch pipe 20 branching from 9 is connected.

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

First, two methods can be used as a method of putting the dewatering plates 6 in the dewatering tank 1 and interposing high hydrous soil between them.

In the first method, a required amount of high hydrous soil S is charged into the dewatering tub 1 from its opening by a crumb backhoe or the like, and in this state, the dewatering plate 6 is suspended on the dewatering tub 1 and removed. By driving the vibrator 2 of the water tank 1, the high hydrous soil S
Alternatively, in a method in which the dewatering plates 6 are penetrated into the high water content soil S while applying vibration to the dewatering plates 6, each dewatering plate 6 is supported on a support rail with its upper part fixed in parallel at a predetermined interval in advance by a detachable temporary fixing spacer. 16 and press-fit into the high hydrous soil S while giving vibrations as needed while hanging down with the support rails 16.

In this case, in order to make the dewatering plate 6 easily penetrate, a water or air injection nozzle is provided at the lower end thereof, and water or air is pressure-fed through a pipe from above to inject while injecting. It may be.

In the second method, the dewatering plate 6 is placed in the empty dewatering tank 1.
Are loaded in parallel at a predetermined interval, and thereafter, the high hydrous soil S is injected and filled between the dehydrating plates 6 and 6 by a mono pump or the like. In this case, the vibrator 2 is driven if necessary. To fill the high hydrous soil S with vibration.

In the state in which the high hydrous soil S is interposed between the dewatering plates 6 and 6 in this manner, the vacuum pump is driven to drive each dehydration through the water absorption main pipe 17, each water absorption branch pipe 18 and the water absorption pipe 11. The inside of the plate 8 is vacuum-suctioned, and the water in the high water content soil S having a certain thickness between the dewatering plates 6 and 6 is suctioned while being filtered by a filter plate (mesh plate 7, perforated plate 8, etc.). Water is absorbed from 11 'and discharged to the outside.

At this time, the internal pressure decreases as the vacuum is suctioned by the dehydrating plates 6, and water is easily sucked into the dehydrating plate 6 in the initial stage of vacuum. The inside of is easy to be in a vacuum equilibrium state,
As the water absorption efficiency deteriorates, it is necessary to
The valve of No. 9 is opened to open to the atmosphere, the air is introduced into the dehydrating plate 6 from the air supply port 13 ′ through the air supply branch pipe 20 and the air supply pipe 13, the vacuum equilibrium state is eliminated, and the high hydrous soil is released. Water is continuously sucked from S and dehydrated continuously and efficiently.

Further, as the dehydration proceeds, the dehydration plates 6, 6
Since the volume of the high hydrous soil S shrinks, a gap is formed between the dewatering plate 6 and the dewatering plate 6, and the dewatering efficiency is reduced. Pressure is applied in the parallel direction, the distance between the dewatering plates 6 and 6 is reduced, and each dehydrating plate 6 is pressed against the shrinked high water-containing soil S without any gap, thereby eliminating a decrease in dewatering efficiency.

The dewatering tank 1 may be vibrated by the vibrator 2 as required during the water absorption step, thereby forcibly exuding and releasing the moisture of the high hydrous soil S inside.

After the dehydration step is performed for a required time to reduce the water content to a reference value or less, the dehydrating plate 6 is lifted together with the support rail 16 by a crane or the like, taken out of the dehydration tank 1 and taken out of the dehydration tank 1, and the support rail 16 is removed. Vibration is applied by a vibrator attached to the etc. to remove the dewatered sand.

As described above, a small amount of a solidifying agent is added to the highly hydrous soil to be dehydrated, but it is hardly necessary to add it to sandy soil.

Further, by increasing or decreasing the number of dewatering plates in accordance with the quality of the dewatered soil, it is possible to cope with a wide range of soil.

[0030]

As described above, according to the present invention, the inside of the dewatering plate is evacuated to a vacuum, so that the dewatering plate is in contact with the high hydrous soil as a wide-area surface parallel to each other. The water in the thin high-moisture soil between the plates can be efficiently suctioned and dehydrated in a very short time, and uniformly as a whole, and the use of a solidifying agent can be reduced or eliminated, which is economical. is there.

In addition, by continuously introducing the atmosphere into the dehydrating plate by vacuum suction during the vacuum suction, the vacuum equilibrium between the dewatering tank and the high hydrous soil is maintained, and the vacuum is continuously maintained. It becomes possible to dehydrate.

Further, since the dehydrating plates are supported on the support rails via rollers, the dehydrating plates are moved by pressing the dehydrating plates in the direction parallel to the dehydrating plates depending on the situation during dehydrating, and the interval between the dehydrating plates is reduced. By shrinking, each dehydrating plate can be pressed against the high hydrous soil shrunk by dehydration without any gap, and the decrease in dehydration efficiency can be eliminated.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a dehydrating apparatus of the present invention.

FIG. 2 is a vertical sectional side view of the dehydrating apparatus of the present invention.

FIG. 3 is an exploded perspective view of the dewatering plate according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dehydration tank 2 Vibrator 3 Side plate 4 Jack 5 Pressure plate 6 Dehydration plate 7 Mesh plate 8 Perforated plate 9 Frame 10 Holding plate 11 Water absorption pipe 11 'Water intake port 12 Bar 13 Air supply pipe 13' Air supply port 14 Hanging material 15 Roller 16 Support Rail 17 Water absorption main pipe 18 Water absorption branch pipe 19 Air supply main pipe 20 Air supply branch pipe S High hydrous soil

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-31514 (JP, A) JP-A-64-43322 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 25/12 B01D 29/01

Claims (1)

(57) [Claims] 1. A box-shaped dewatering tank having an open upper end, and a hollow plate body provided with a filter plate on the front and back sides and having a water intake port and an air supply port in the hollow interior, wherein a plurality of water tanks are provided from the top to the bottom of the dehydration tank. A dehydrating plate suspended in parallel, a water piping connected to a water inlet of the dewatering plate, and a vacuum pipe for vacuum suction by a vacuum pump , and a vacuum suction pipe by the vacuum pump.
In order to introduce the atmosphere into the dewatering plate that has been evacuated by vacuum suction, an air supply pipe communicated with an air supply port of the dehydration plate and the dehydration tank above the dehydration tank are provided. A supporting rail horizontally arranged in a direction parallel to the plate group and supporting an upper end portion of the dehydrating plate via a roller, and a pressing plate installed in a side portion of the dewatering tank so as to be able to advance and retreat in the direction parallel to the dehydrating plate group. A dehydrating apparatus for high hydrous soil, comprising: