JPH1018264A - Dehydration bag for bagging dehydration of high moisture-content caly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent clay from flowing out and ensure an efficiency of dehydration by installing a sheet such as nonwoven fabric having an impermeable portion of clay particles disposed inside and outside of the face on the adverse portion of a pouring opening of a bag body comprising water permeable cloth. SOLUTION: An upper bag body 2 and lower bag body 3 being sewed mutually are produced of water permeable cloth, and a pouring opening 4 is put on the upper bag body 2 for pouring high moisture content clay. At that time, on a part opposed to the pouring opening 4 in the inner face of the lower bag body 3, a nonwoven fabric sheet is set as a sheet 5 for forming a nonpermeable portion of clay particles. Also, the sheet 5 are formed into various shapes such as a rectangle, circle, or the like, the size is made larger than the opening area of the pouring opening 4 allowing for an expansion of stream of the high moisture content clay. The sheet 5 is fastened onto the lower part bag body 3 by suture or adhesion before suturing the upper and lower bag bodies 2, 3. Thus, if the high moisture content clay is poured at high speed, the clay can be controlled in its outflowing, and an efficiency of dehydration can be precluded from lowering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatering bag for bagging and dewatering a clay having a high water content. More specifically, the present invention relates to a dewatering bag for dewatering a bag for dewatering a high-moisture content clay deposited on a bottom surface layer of a river, a lake, or the like for effective use for embankment.

[0002]

2. Description of the Related Art In recent years, the treatment of high-moisture-content clay or ultra-soft clay deposited on the bottom surface layer of rivers, lakes and marshes for environmental purification has been increasing. High moisture content clay or ultra-soft clay is generally called sludge and is removed from rivers and lakes by dredging. The dredged high water content clay is mechanically dewatered by a dewatering device or chemically added with a solidifying material, and is used as earth and sand in landfills and land for construction.

On the other hand, as a method of treating the dredged clay having a high water content, the clay having a high water content is poured into a large permeable dewatering bag without using a mechanical dehydrator, and dewatered. A bag dewatering method has been proposed that can be effectively used as part of the embankment as it is. In this bag dewatering method,
In order to treat a large amount of high water content clay, a large dewatering bag having a circumference of 4 m or more is often used. In addition, since the weight of the clay in the bag increases due to this, in order to prevent breakage of the bag due to its own weight, a woven cloth having a high tensile strength is usually used as a material constituting the bag body.

In the bag dewatering method, it is important that water and clay are almost completely separated by a dewatering bag so that the clay does not flow out. If a large amount of clay flows out, it causes environmental pollution such as pollution. However, when muddy clay with a high water content is poured into a dewatering bag made of woven fabric, the thickness of the woven fabric is generally as thin as 1 mm or less. Will leak out.

That is, when the flow rate of the high water content clay is very low, a cake-like clay layer is formed on the surface of the woven fabric by the dehydrated clay, so that only water flows out and the clay flows out. Disappears. However, in this case, the dewatering efficiency is extremely poor.

On the other hand, when the flow rate of the high water content clay is as large as 0.5 m / sec or more, the dewatering efficiency is good. However, since the high water content clay collides with the bag at a high speed in the early stage of injection, the clay layer on the surface of the woven fabric facing the injection port is always washed away by the high water content clay injected. It disappears and the clay flows out through the fabric.

[0007]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects. An object of the present invention is to provide a dewatering bag for bagged dewatering in which the outflow of clay is prevented without lowering the dewatering efficiency.

[0008]

The present invention employs the following means to achieve the above object. That is, the present invention is a dewatering bag having an injection port for injecting a high water content clay, wherein the bag body is made of a permeable woven fabric, and a clay particle is provided in a portion of the bag body facing the injection port. A dewatering bag for packing and dewatering high-moisture content clay, characterized in that a non-permeable portion is provided. The present invention also resides in a dewatering bag for bagging and dewatering a high water content clay, wherein the non-permeable portion comprises a sheet provided on the inner surface or outer surface of the bag. Furthermore, the present invention resides in a dewatering bag for bag dehydration of a high moisture content clay, wherein the sheet is made of a water-permeable material.

The high water content clay injected into the bag from the inlet collides with the impermeable portion. This impermeable portion is a portion that does not allow clay particles to pass through. Therefore, even if the high water content clay is injected at a high speed, the clay does not flow out of the bag.

[0010] The impermeable portion can be constituted by providing a sheet in a layer on the surface of the bag, in which case the sheet is formed on the inner surface of the bag,
It may be located on either side of the outer surface. Further, a part of the bag itself, that is, a part facing the injection port may be an impermeable part.

The impermeable portion may be any material as long as it does not allow clay particles to pass through, and its material is not limited. That is, any water-permeable material that does not allow clay particles to pass through but allows water to pass through, or clay particles and water-impermeable materials that do not allow water to pass through may be used. As the water permeable material, a fibrous sheet such as a nonwoven fabric, a woven fabric, or a knitted fabric is used, and the material may be any of a natural fiber and a synthetic fiber. In particular, a nonwoven fabric sheet made of synthetic fiber is desirable in terms of strength and durability. When the fiber sheet is provided in the form of a layer, it is sufficient that the size of the through hole of the sheet is smaller than the size of the through hole of the bag body (usually about 90 to 600 μm). This is because, by laminating the sheets in layers, the thickness of the bag is partially increased and the clay particles do not flow out.

As the water-impermeable material, a synthetic resin sheet such as a vinyl chloride sheet, a leather sheet, or the like can be used. Sheets are preferred. In addition, a wooden or metal plate can be used instead of the sheet, but there is some difficulty in transportability since the bag is folded small when transporting the bag.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. The dewatering bag 1 comprises an upper bag 2 and a lower bag 3 sewn together in this embodiment. Bag 2,
3 is made of a water-permeable woven fabric as in the prior art. The upper bag 2 is provided with an inlet 4 from which the high water content clay is injected.

A sheet 5 constituting an impermeable portion for clay particles is formed on the inner surface of the lower bag 3, specifically, on a portion facing the injection port 4.
Is provided. As the sheet 5, a nonwoven fabric sheet is used. The shape of the sheet 5 can be various shapes such as a rectangle and a circle. The size of the sheet 5 is
Since the high water content clay flow discharged from the inlet 4 exhibits a spread, the opening area of the inlet 4 is made larger.

The sheet 5 is sewn before the upper and lower bags 2 and 3 are sewn.
It can be fixed to the lower bag body 3 by sewing or bonding. When both the lower bag 3 and the sheet 5 are made of synthetic fibers, the sheet may be fixed by high frequency welding, ultrasonic welding, or the like. The sheet 5 may be arranged on the outer surface of the lower bag 3. Further, the lower bag 3 itself may be made of a nonwoven fabric.

According to the dewatering bag as described above, the high water content clay injected into the inside of the bags 2 and 3 from the injection port 4 collides with the sheet 5, but since the sheet 5 does not allow clay particles to pass, Even if the high water content clay is injected at high speed, the clay does not flow out of the bag.

[0017]

EXAMPLE A muddy clay having a water content of 2000% was poured into a dewatering bag made of a woven cloth having a circumference of 4 m and a thickness of 0.25 mm, and a large amount of clay particles flowed out through the bag. .
Then, as shown in FIGS. 1 and 2, when the nonwoven fabric sheet 5 was applied to the inside of the bag body, no outflow of clay particles occurred.

[0018]

As described above, according to the present invention, even if a high water content clay is injected at a high speed, the clay does not flow out and the dewatering efficiency does not decrease.

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dehydration bag 2 ... Upper bag body 3 ... Lower bag body 4 ... Injection port 5 ... Sheet

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tetsuya Yamada 1 Asahi, Oaza, Tsukuba, Ibaraki Prefecture Inside the Public Works Research Institute, Ministry of Construction (72) Inventor Shohei Senda 1-6-4 Taito, Taito-ku, Tokyo Foundation civil engineering research Inside the center (72) Inventor Nobuaki Wada 1-6-4 Taito, Taito-ku, Tokyo Inside the Foundation Civil Engineering Research Center (72) Inventor Hiroshi Kokubo 1534-1, Yosoku-cho, Nishinasuno-cho, Nasu-gun, Tochigi Goyo Construction Inside the corporation

Claims (3)

[Claims] 1. A dewatering bag having an injection port for injecting a high water content clay, wherein a bag body is made of a permeable woven cloth, and a clay particle is formed in a portion of the bag body facing the injection port. A dewatering bag for bagging and dewatering high-moisture-content clay, wherein a non-permeable portion is provided. 2. The dewatering bag according to claim 1, wherein the non-permeable portion comprises a sheet provided on an inner surface or an outer surface of the bag. 3. The dewatering bag for bagging and dehydrating a high moisture content clay according to claim 2, wherein said sheet is made of a water-permeable material.