JP3105216U - Dredging dewatering equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid-liquid separation method for dredged earth and sand always quickly, reliably and easily with a small space. An object of the present invention is to provide a dredged soil dewatering apparatus that can be easily and efficiently performed.
SOLUTION: A compression tank 1 provided with a discharge gate 2 at least on one side so as to be openable and closable, and fitted into the compression tank 1 to compress the dredged soil S by required pressing means 12 from above. The pressing member 4 has a substantially lattice frame shape and is dewatered while being permeable, and a permeable member 6 attached to the lower surface of the pressing member 4. Are sequentially laminated.
[Selection diagram] Fig. 1

Description

  The present invention relates to a dewatering apparatus for dredged soil mainly in rivers, lakes, marshes, harbors, dams, sewage facilities, gutters, culverts, and the like.

  Conventionally, when dredged soil such as rivers is treated, a method of throwing dredged sand into a pre-set sedimentation basin for sedimentation treatment, a method of drying the dredged sand by solar drying, adding cement to the dredged sand. And a method in which dredged soil is charged into a liquid cyclone and classified into gravel, sand, and fine particles (see JP-A-2000-167432).

  Such a conventional treatment method is intended to reduce the volume of the dredged soil and landfill it, or to separate it into solid and liquid in order to reuse gravel and sand, etc. It is said that about 90% to 150% of water contained in the earth and sand is subjected to a simple treatment such as a precipitation treatment after solid-liquid separation and discharged.

  However, water contained in dredged soil includes environmental pollutants such as eutrophication promoting substances (such as nitrogen and phosphorus) in rivers, pesticides, heavy metals, exhaust gases, dioxins, or endocrine disrupting substances (environmental hormones). Therefore, when the polluted water separated into solid and liquid is simply discharged, the environment is re-polluted and a serious problem is easily caused.

  In order to solve such a conventional problem, the present inventors have previously conducted a step of filtering dredged soil and separating it into solid and liquid, and adding a required coagulant to the separated contaminated water to flocculate the contaminated substances. A method for treating dredged soil (Japanese Patent Application Laid-Open No. 2002-186999), which comprises a step of pressurizing and floating a flocked contaminant while blowing compressed air into the contaminated water to remove the contaminated substance. Reference).

In the conventional example configured as described above, not only the dredged soil can be filtered to surely separate the soil and the polluted water into solids and liquids, but also the environmental pollutants contained as pollutants in the separated polluted water. The substance can be surely removed by flocculating the substance with a coagulant and causing the substance to float under pressure, and thus can effectively prevent recontamination of the environment at all times.
JP-A-2002-186999

By the way, since the above-mentioned conventional example is to filter and separate dredged soil into solid and liquid, it takes a long time for the separation process, not only the processing efficiency is extremely poor, but also the separated dredged soil itself. Dewatering tends to be insufficient, and subsequent processing is very troublesome, and further, there is a problem that the installation space tends to be large.

  The present invention solves such a conventional problem, and enables dredged soil to be solid-liquid separated quickly, reliably, and easily with a small amount of space. An object of the present invention is to provide a dredged soil dewatering apparatus capable of easily and efficiently performing solid-liquid post-treatment.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a compression tank having at least one side on which a discharge gate is freely openable and closable, and a required pressing means which is fitted into the compression tank and is provided from above. A dredged soil dewatering apparatus characterized by comprising a substantially lattice frame-shaped pressing body for dewatering while compressing the dredged soil and a permeable body attached to the lower surface of the pressing body. It is assumed that.

  According to a second aspect of the present invention, there is provided an apparatus for dehydrating a dredged soil according to the first aspect, wherein the permeable body has a structure in which a permeable sheet and a screen are sequentially laminated on a support member. It is the gist.

Since the invention according to claim 1 is configured as described above, dredging earth and sand is charged into the compression tank, and depressed by a pressing body from above with required pressing means to be compressed and dewatered through the permeable body. With a simple operation, the dredged soil can be always and quickly, reliably and easily separated into solid and liquid efficiently with a small amount of space. The solid-liquid post-treatment can be easily and efficiently performed.

  Since the invention of claim 2 is configured as described above, the water contained in the dredged soil can be surely subjected to dehydration treatment in the form of filtration. It can be performed easily and efficiently.

Hereinafter, the best mode for carrying out the present invention will be described based on an embodiment shown in the drawings.

1 to 3 show one embodiment of the present invention, in which 1 is a portable rectangular compression tank having a required volume, and 2 is a lever provided on one side of the compression tank 1. A discharge gate mounted so as to be able to open and close freely via a line -3. Reference numeral 4 denotes a substantially lattice frame-shaped pressing member which can be freely fitted in the compression tank 1, 5 denotes a pressing plate for pressing means mounted on the upper surface of the pressing member 4, and 6 denotes a lower surface of the pressing member 4. The permeable body 6 includes a support member 7 having a substantially lattice frame shape, a permeable sheet 8 provided on the support member 7, and a mesh formed on the permeable sheet 8. And a screen 9 of FIG. In addition, reference numeral 10 denotes a hanging rope attached to the pressing body 4, reference numeral 11 denotes a drainage pipe which can be freely connected to the compression tank 1 in a communicating manner, and reference numeral 12 denotes a power for pressing the pressing body 4 through the backing plate 5. Excavator. S indicates dredged soil and W indicates separated water.

Next, the operation of the embodiment configured as described above will be described.
First, the untreated wet dredged soil S is charged into the compression tank 1 in which the discharge gate 2 is closed. Next, the pressing body 4 is fitted into the compression tank 1 from above while being lifted by the power shovel 12 via the hanging rope 10. After that, the tip of the power shovel 12 is pressed against the backing plate 5 while pressing the permeable body 6 together with the pressing body 4 to compress the dredged soil S. Then, the dredged soil S is dewatered by the compression of the pressing body 4 and the permeable body 6, and the dewatered water gradually rises through the permeable sheet 8 and the screen 9 of the permeable body 6 and is stored on the pressing body 4. . At this time, the separated water W which has been dewatered and separated from the dredged soil S is permeated through the permeable sheet 8 of the permeable body 6, so that the separated water W can be purified into a filtered form.

  When the predetermined pressure is reached, the pressing by the power shovel 12 is stopped, and the separated water S stored on the pressing body 4 is discharged outward by the drain pipe 11. When the separation water W is completely discharged, the pressing body 4 is taken out from the compression tank 1 by the power shovel 12, and the discharge gate 2 is opened via the lever 3 to remove the dewatered dredged soil S. Let it drain out. The discharged dredged soil S is post-treated by a known method, and the separated water W is added with a coagulant to flocculate the contaminants in the same manner as in the conventional example. May be floated under pressure to be removed. At this time, since the dredged soil S is compressed and dewatered, the post-treatment of the dewatered dredged soil S and the separated water W is performed easily and efficiently as compared with the conventional example of filtering. In addition to being able to perform the dewatering process, the dewatering process can be performed quickly, reliably and efficiently with less space compared to the conventional filtration process.

  In the above embodiment, the discharge gate 2 is provided only on one side of the compression tank 1, but a plurality of discharge gates may be provided if necessary. Although the power shovel 12 is shown as the pressing means, the power shovel 12 is not limited to the power shovel, and other known means such as a hydraulic cylinder can be adopted. Further, although the screen 9 is formed in a mesh shape, it is not limited to this, and a known screen such as a lattice shape or a perforated plate shape can be adopted and used.

FIG. 2 is a perspective view showing an embodiment of the present invention. FIG. 3 is an exploded perspective view showing a permeable body 6 of the embodiment. FIG. 4 is a vertical sectional view showing a use state of the embodiment.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Compression tank 2 Discharge gate 4 Pressing body 6 Permeable body 7 Support member 8 Permeable sheet 9 Screen 12 Power shovel S Dredged soil W Separated water

Claims (2)

A compression tank provided with a discharge gate at least on one side so as to be openable and closable, and a substantially lattice-frame-shaped press fitted in the compression tank to compress and dewater the dredged soil from above with required pressing means. An apparatus for dehydrating dredged soil, comprising a body and a permeable body attached to the lower surface of the pressing body.   2. The apparatus according to claim 1, wherein the permeable body has a structure in which a permeable sheet and a screen are sequentially laminated on a support member.

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