JP5085866B2 - Bag for dehydration of hydrous soil - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention, for example, a bag body that can be suitably used for dehydrating and reducing water-containing soil deposited in rivers and lakes, and dehydrating and reducing water-containing soil to contain the soil inside the bag body. The present invention relates to a bag for dehydration of water-containing soil.

  Conventionally, a construction method has been proposed in which contaminated soil containing toxic substances such as water and dioxin and PCB is filled in a woven fabric or non-woven fabric bag, dehydrated and reduced to contain the contaminated soil. No. 1 discloses a method of using a water-permeable bag made of chemical fiber and pressurizing and dehydrating by press-fitting contaminated soil, or stacking the bags sequentially and depressurizing the lower bag. Yes.

  In such a construction method, a method of injecting highly water-containing soil by inserting the tip end portion of an injection hose connected to a pressure pump from a cylindrical injection port is often used. However, in order to prevent the injected soil from flowing back when the hose is pulled out, Japanese Patent No. 3330026 discloses a method of installing a cylindrical inlet so as to protrude into the bag body.

  However, in the above method, when the soil is injected, the injection port that protrudes to the inside is exposed, so that the injection speed must be suppressed. To avoid this, the hose is protruded into the bag body. In this case, if the hose is pulled out after the end of the injection, a situation may occur in which the inner cylindrical inlet of the bag is pulled out together with the hose, and the function of preventing backflow often cannot be performed. Had.

  Moreover, as a bag body, Japanese Patent Application Laid-Open No. 2002-178000 discloses a bag body made of chemical fibers such as polyester and polypropylene, and a non-woven fabric, a woven fabric, a knitted fabric and the like. However, it is difficult to obtain a fabric with a uniform basis weight and thickness with a non-woven fabric, and when injected at a high pressure, there is a problem that the pressure is applied to a low basis weight or a thin part and the eyes are enlarged to reduce the filtration efficiency. However, there is a problem that the filtration efficiency is lowered due to the expansion of the seam, and there is a problem that the seam is easily clogged and the seam is easily torn.

JP 2002-178000 A Japanese Patent No. 3330026

  The object of the present invention is to solve the above-mentioned problems of the prior art, and to filter the high water content soil deposited in rivers, lakes, etc. efficiently and to a level that does not require wastewater treatment. It is an object of the present invention to provide a bag body that can stably and efficiently inject a highly water-containing soil in a bag body for containing water-containing soil on a surface or the like, and can prevent backflow of soil after the injection.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that in a bag-filled dewatered bag made of a high moisture content clay poured into a bag body and dehydrated, the injection portion into the bag body is formed as a bag body. So that the projecting length to the inside of the cylindrical body is not less than 30 cm and not more than 500 cm, and the end diameter of the cylindrical body is not less than 1.5 times the diameter of the injection port It has been found that it can be solved by adopting a structure formed so as to protrude inside and outside of the bag body, and that it can be filtered stably and efficiently by using a fabric of a specific cover factor as the bag body.

  According to the present invention, a bag body that can stably and efficiently filter soil having a high water content accumulated in rivers, lakes, and the like and to a level that does not require wastewater treatment, and the bag body are used. A method for containment of hydrous soil is provided.

  In this invention, the injection | pouring part to a bag body is a cylindrical body formed so that it might protrude inside and outside of this bag body, and this cylindrical body is 30 cm or more and 500 cm or less of protrusion length to the inside of a bag body. It is necessary to be. If it is shorter than 30 cm, there is no sufficient backflow prevention effect, and there is a possibility that the soil that has been injected when the hose is pulled out will leak. Moreover, when longer than 500 cm, it is necessary to insert a hose to the back of a bag body, and injection | pouring efficiency is bad.

On the other hand, for the diameter of the cylindrical body, the diameter of the innermost outlet that protrudes to the inside is 1.5 times or more than the diameter of the inlet provided at the end protruding to the outside of the cylindrical body, It needs to spread as it goes inside.
When the ratio of diameters is smaller than 1.5, when the high water content soil passes between the hose outlet and the tip of the inlet when injecting from the hose, the cylindrical inlet is exposed and the injection cannot be performed efficiently. .

  Examples of the multifilament yarn of synthetic fiber used in the present invention include multifilament yarns such as polyester, nylon, vinylon, and polypropylene, and among them, polyester multifilament yarn is preferable. In particular, among polyester multifilament yarns, when a polyethylene terephthalate multifilament yarn showing good physical properties or a bag body is to be permanently embedded, a multifilament yarn made of polylactic acid fiber is used from the viewpoint of biodegradability. preferable.

  The polyester multifilament yarn is preferably a multifilament yarn made of recycled polyester. Here, recycled polyester refers to polyester recycled from recovered PET bottles, recovered polyester fibers, recovered polyester film, etc., and the material recycling method in which the recovered polyester is melted to form yarn again, or recovered polyester Examples thereof include regenerated polyester obtained by a chemical recycling method in which a polymer is depolymerized and converted into a polymer again.

  As a specific example of the material recycling method, as disclosed in JP-A-2000-29362, the recovered polyester polymer is melt-reacted with a bisoxazoline-based compound, and the intrinsic viscosity of the polyester polymer is changed to O.D. Specific examples of the method of 5 to 1.1 and the chemical recycling method include terephthalates obtained by methanol depolymerization of recovered polyalkylene terephthalate polymers, as disclosed in JP-A-2003-160656. Dimethyl acid is used in an amount of 70% by weight or more as a catalyst, and a titanium compound and a phosphorus compound are used in a glycol so that the number of moles of phosphorus element (P / Ti) relative to the number of moles of titanium element falls within a specific range. Examples thereof include a method of polycondensation reaction using a precipitate obtained by heating at a temperature.

  The total fineness of the multifilament yarn is usually 75 to 2000 dtex, preferably 150 to 1500 dtex, and the total number of filaments is usually 75 to 2000 filaments, preferably 150 to 1500 filaments. The synthetic filament multifilament yarn is woven into a woven fabric by a conventional method, and a bag is formed using the woven fabric.

Here, the cover factor (CF) of the woven fabric used for the bag body needs to be 1900-2700. Preferably it is 2100-2500. The cover factor (CF) was calculated by the following formula.
CF = (DWp / 1.1) ^1/2 × MWp + (DWf / 1.1) ^1/2 × MWf
Here, DWp is the total warp fineness (dtex), MWp is the warp weave density (main / 3.79 cm), DWf is the total weft fineness (dtex), and MWf is the weft weave density (main / 3.79 cm). The woven structure and the number of layers are not particularly limited. For example, preferred examples of the woven structure include a plain structure, a twill structure, and satin, but are not limited thereto. The number of layers may be a single layer or a multilayer of two or more layers.

  The cover factor (CF) can be appropriately adjusted according to the fineness and density of the warp and weft constituting the woven fabric as is apparent from the equation. When this cover factor is lower than 1900, when injecting soil at high pressure, the mesh opening diameter increases, filterability decreases, and the seam of the bag expands, causing unfiltered soil and harmful substances to flow out. There is a problem to do. On the other hand, when the cover factor is higher than 2700, the mesh is clogged and the filtration rate is lowered.

  Thus, according to the present invention, in the bag dewatering bag made of cloth skewer for injecting high water content clay into the bag body and bagging and dewatering, the injection portion to the bag body is composed of a cylindrical body attached to the bag body And projecting into and out of the bag body so that the projecting length to the inside of the cylindrical body is 30 cm or more and 500 cm or less, and the end diameter of the cylindrical body is 1.5 times or more the diameter of the injection port. And the cover factor of the multifilament yarn fabric of synthetic fibers is 1900-2700 when the bag for dehydration of the hydrous soil is made of a synthetic filament multifilament yarn fabric. In addition, after putting contaminated soil containing harmful substances into the bag, moisture contained in the contaminated soil in the bag can be stably permeated to the outside of the bag to dehydrate, and harmful substances attached to the contaminated soil. In the bag Door can be.

  Hereinafter, the present invention will be described more specifically with reference to examples.

[Example 1-9, Comparative Example 1-3]
Soil preparation: Kasumigaura clay was adjusted to a muddy water state with a water content of 300%.
Production of bag: A plain fabric made of polyester was sewn to produce a bag material having a circumference of 8 m and a length of 20 m.

  The inlet of the size as shown in Table 1 and Examples 1 to 7 was provided, and the above-prepared soil was injected with a pump, and the situation was observed. At that time, the hose was inserted up to a half of the entire length of the inlet cylindrical body. By taking these structures, the water-containing soil could be injected stably and the filtration was also good. In Comparative Examples 1 to 3, there were problems such as backward flow, tubular bodies being broken, and clogging. In Examples 8 and 9, those with cover factors 2000 and 2600 were used, but the filtration efficiency was very good. Conversely, since Comparative Example 4 had a low cover factor of 1500, filtration leakage occurred, and Comparative Example 5 had a high value of 3000. Therefore, clogging occurs on the contrary and the efficiency is deteriorated, which is a problem.

  According to the present invention, there is provided a bag body that can be suitably used for containment of hydrous soil containing harmful substances, and a method for containing hydrous soil breakage using this bag body, so that dioxins, PCBs, arsenic, Highly water-containing soil containing harmful substances deposited in rivers and lakes such as lead can be filtered efficiently to a level that does not require wastewater treatment.

Claims (10)

  In a bag body for bag filling and dehydration made by injecting high water content clay into a bag body and dehydrating the bag, a cylindrical body formed so that the injection portion to the bag body protrudes inside and outside the bag body And the innermost part of the cylindrical body projecting inward with respect to the diameter of the injection port provided at the end projecting to the outside of the cylindrical body, with the projecting length of the cylindrical body from 30 cm to 500 cm A bag for dehydration, which has a structure in which the diameter of the discharge port is 1.5 times or more.   The bag body for dehydration according to claim 1, wherein the bag body for bag dehydration is a bag body made of a multifilament yarn fabric of synthetic fibers, and the cover factor of the multifilament yarn fabric of synthetic fibers is in the range of 1900-2700. Bag body.   The bag body for bagging and dewatering according to claim 2, wherein the multifilament yarn of the synthetic fiber is a multifilament yarn made of at least one synthetic fiber selected from the group consisting of polyester, nylon, vinylon, and polypropylene.   The bag for dehydration according to claim 2 or 3, wherein the polyester multifilament yarn is a multifilament yarn made of recycled polyester.   The bag for dehydration according to claim 4, wherein the regenerated polyester is a polyester regenerated from a collected PET bottle.   The bag for dehydration according to claim 4, wherein the regenerated polyester is a polyester regenerated from the recovered polyester fiber.   The bag for dehydration according to claim 4, wherein the recycled polyester is a polyester regenerated from a recovered polyester film. The bag for dehydration according to claim 2, wherein the multifilament yarn of the synthetic fiber is a multifilament yarn made of polylactic acid fiber .   After putting water-containing soil in a water-permeable bag, moisture contained in the bag's soil permeates out of the bag and dehydrates it, and the soil remains in the bag and is contained in the bag. A method for containing water-containing soil, wherein the bag for dehydration according to any one of claims 1 to 8 is used as the bag.   The method for containing hydrous soil according to claim 9, wherein the soil further contains a harmful substance, the soil and the harmful substance contained therein are left in the bag body and are contained in the bag body.