JP2005052755A - Dehydration method and dehydration bag for earth and sand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dehydration method and a dehydration bag for earth and sand which eliminate clogging of the dehydration bag and exhibit high dehydration effect by inserting a drain material into the bag to discharge water through the drain material. <P>SOLUTION: The drain material is disposed in the bag so that its one or both ends project outside. Muddy water is poured into the bag, and the water is drained through the drain material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for dehydrating earth and sand, in which earth and sand mainly containing viscous soil containing moisture are put in a bag and quickly dehydrated, and a dewatering bag used therefor.

  Conventionally, methods for dewatering mud contained in soil such as clay soil that has been dredged are known as a dewatering method using a filter press or drum press, a method of drying in the sun in a pit, and a dewatering method by bagging. It has been.

As a method by this bagging, a step of arranging a water-permeable slender bag containing clay with a high water content in one step on the left and right, and a substantially triangular cross section formed between the upper surfaces of adjacent bags at that time A step of forming a water permeable layer in the space, a step of arranging the same bag in the other step centering on the water permeable layer on the one step bag, and a step of repeating this step. Known inventions such as a filling and dewatering method (see, for example, Patent Document 1) have been made.
JP-A-6-328100 (second page, FIG. 1)

  However, in the above invention, since dehydration is performed only with the dehydration bag, clogging occurs, and there is a problem that it takes time for dehydration and effective dehydration cannot be expected.

  The present invention provides a method for dewatering earth and sand and a dewatering bag, in which a drain material is inserted into an elongated bag and water is discharged through the drain material, so that the dewatering bag is not clogged and has a high dewatering effect.

  The present invention comprises a drainage method for earth and sand that is arranged in a bag so that one end or both ends of the drain material protrudes outside, injects muddy water into the bag, and discharges moisture through the drain material. As the dewatering bag used in the method, a dewatering bag made of earth and sand is disposed in the bag so that one end or both ends of the drain material protrudes to the outside.

  According to the present invention, the installation space for pits and dehydration machinery used in the conventional dehydration method is unnecessary, and the shape change of the dehydration bag can easily cope with various on-site conditions and saves space. Can be dehydrated.

  In addition, since muddy water is confined in the bag, it does not adversely affect the living environment that could be constructed even in the city, and by making the drain material and bag material used biodegradable, disposal processing becomes unnecessary. Furthermore, the dehydrated material can be used in a variety of ways, such as mud containing low to high water content, mud containing clay, silt, and sand, or flocked with drowned mud or flocculant.

  Furthermore, the slender bag used in the present invention can be made of a water-permeable or non-water-permeable material depending on the usage, and the drainage bag in which muddy water is injected into the drain material insertion type bag of the present invention is stacked in a bowl shape. Thus, the dehydration rate is further improved, and a high dehydration effect can be expected.

In addition, the dehydrated cake obtained by the present invention can be handled and post-treatment becomes easy.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing a dewatering bag 4 in one embodiment, and this dewatering bag 4 projects a drain material 1 from one end of an elongated bag 2 for injecting muddy water 3 or from both ends as shown in FIG. In order to inject mud water 3 into the bag 2, an inlet (not shown) is provided in both or one of the upper part and the lower part of the drain material 1.

  If the drainage material 1 is inserted into the bag 2 and left in the state where the muddy water 3 is poured into the dewatering bag 4 as described above, the moisture of the muddy water 3 is projected to the outside of the bag 2 through the drain material 1. The muddy water 3 in the bag 2 is rapidly dehydrated to reduce its volume.

  2 is a cross-sectional view in the AA direction of FIG. 1, and FIG. 3 is a side cross-section in the BB direction of FIG. As shown in these drawings, the water in the muddy water 3 passes through the drain material 1 as indicated by the arrow and is immediately discharged to the outside.

  When the drain material 1 is arranged so as to cover the entire width of the bag 2, the muddy water 3 inlets are arranged at two locations above and below the drain material 1, and when the full width is not covered, the muddy water 3 inlet may be one location. . Further, as shown in FIG. 4, it is possible to arrange the dehydration bags 4 in a horizontal direction by stacking one stage. However, as shown in FIG. To promote dehydration.

  Note that the dewatering bag 4 with the drain material 1 inserted as in the present invention has a volume reduction rate (dehydrated cake volume / muddy water volume) after 12 hours, compared with a conventional bag without the drain material 1 used conventionally. It has been confirmed in the embodiment of the present invention that it is doubled.

  The present invention is mainly composed of cohesive soil and can be used particularly effectively for dehydration of dredged soil containing moisture.

It is a schematic perspective view of the dehydration bag of this invention. It is AA direction sectional drawing of FIG. It is a sectional side view of the BB direction of FIG. It is sectional drawing of the state which stacked | piled up the dehydration bag of FIG. It is sectional drawing of the state which piled up the dehydration bag of FIG.

Explanation of symbols

1 drain material 2 bags 3 muddy water 4 dewatering bags

Claims (2)

A method of dewatering earth and sand, in which one end or both ends of the drain material protrudes outside in the bag, mud is injected into the bag, and water is discharged through the drain material. A dewatering bag of earth and sand that is placed in the bag so that one or both ends of the drain material protrudes outside.

Images