JP2004324260A - Bagging dehydration method of fluid containing solid particle, and bag body used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform construction in a comparatively short time while reducing a problem of damaging a bag body. <P>SOLUTION: The approximately cylindrical bag body 1 with four shape holding hoses 2 arranged inside is used. One end side opening of the bag body 1 is closed with a fitting 7, and a hose outlet at the other end is provided with a hose holding plug 8 formed with through holes corresponding to each of four shape holding hoses 2. Each shape holding hose 2 is led outside the bag body 1 through the through hole of the hose holding plug 8. When a fluid containing solid particles such as sea bottom sediment or excavated muck is injected into the bag body 1 from an inlet 5 (an injection process), moisture in the fluid is discharged outside from the surface of the bag body 1, or enters inside from the surface of the shape holding hose 2, moves toward the hose outlet of the bag body 1 through the interior and is discharged outside the bag body 1 (a discharge process). After the lapse of a prescribed time from the injection process and the discharge process, water is fed into the shape holding hose 2 in a reverse direction to the flow of moisture in the shape holding hose 2 in the discharge process (a water feeding process). The injection/discharge process and water feeding process are repeated until the completion of dehydration. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for bag dehydration of a fluid containing solid particles, and a bag used for the same, particularly sludge containing fine solid particles such as sea bottom, lakes, marshes, river sediments and excavation waste in excavation work. And a bag used for the method.
[0002]
[Prior art]
Used as a method of reusing seabed, lakes, marshes, riverbed sediments, and drilling debris for drilling work, by injecting it into a water-permeable bag, dehydrating it, giving it strength, and forming embankments. It is possible. In such reuse, when the bags are stacked, large sinking due to dehydration is likely to occur, so that it is difficult to make the embankment a predetermined height. Therefore, in order to form an embankment of a predetermined height, a plurality of bags filled with clay are stacked, and the water in the clay is dewatered from the bags by self-weight compaction and solar drying, and the solid material inside the bags is formed. A method has been proposed in which an amount of clay substantially equal to the amount of dewatered water when the thickness becomes smaller than the initial amount is again injected into each bag (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Publication No. H8-19647 (page 2, FIG. 3)
[0004]
[Problems to be solved by the invention]
However, according to the above-mentioned literature, since a fluid such as clay is poured into a bag body and left to dehydrate, there is a problem that it takes a long time to perform the construction.
[0005]
In addition, since the clay is injected again into each of the stacked bags, it is necessary to lift the upper bag when injecting the clay into the lower bag. Therefore, a large-scale operation of lifting the weight of the bag filled with clay or the like is required, and the bag may be damaged.
[0006]
Further, when the bags are stacked and dehydrated one by one without dehydrating, the dehydration and injection are repeated for each layer, so that the construction time becomes extremely long.
[0007]
Accordingly, an object of the present invention is to provide a method for bagging and dewatering a fluid containing solid particles, which can reduce the problem of breakage of the bag, and can be performed in a relatively short time and easily. Is to provide the body.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a method of bagging and dewatering a fluid containing solid particles according to the present invention includes a step of injecting a fluid containing solid particles into a bag, and a drainage member disposed in the bag. And a draining step of discharging the water in the injected fluid to the outside of the bag through the inside of the bag (claim 1).
[0009]
According to the above configuration, the water in the fluid injected into the bag is discharged to the outside not only through the surface of the bag but also by the drainage member disposed in the bag. That is, since the drainage member is disposed in the bag body, the area related to dehydration increases, and the dewatering effect increases as compared with the case of using a bag body that does not include the drainage member, thereby shortening the construction time.
[0010]
In the dehydration process, fine solid particles such as silt tend to adhere to the bag body surface, which tend to enter the texture of the bag body surface and hinder the passage of moisture. Therefore, when dehydration is performed only through the surface of the bag, there is a concern that the dehydration effect during the operation may be reduced. The problem of degradation can be reduced. Also in this respect, it can be said that the construction time is shortened according to the above configuration.
[0011]
The pouring step and the draining step can be performed almost simultaneously, and when the pouring step is completed, the dehydration is completed almost at the same time, and a hard and strong bag is obtained. Therefore, there is no need to leave the bags after the injection step, and the dehydration is completed in a short time, and the bags can be stacked. Then, there is no large change in the thickness of the bag body due to the subsequent dehydration, and the collapse of the embankment formed by stacking the bag bodies is prevented.
[0012]
In addition, even when the dehydration is not completely completed and some moisture remains in the bag, the drainage effect by the drainage member is maintained by keeping the drainage member provided in the bag. Therefore, when the bags are stacked to form an embankment or the like, even if moisture enters the bags due to rainfall, the drainage member functions as a drain material in the soil, so that the bags can be firmly held. .
[0013]
Further, since the fluid is not injected again after stacking the bags as in the prior art described above, there is no need to perform a large-scale operation of lifting the bags, the construction work is easy, and there is a problem that the bags may be damaged. It is reduced.
[0014]
It is preferable that the method further includes a fluid feeding step of feeding a fluid into the drain member in a direction different from a direction in which water in the fluid is drained in the drain step (claim 2).
[0015]
In the same manner as described above for the bag surface, there is a concern that fine solid particles adhere to the surface of the drainage member and the dewatering effect of the drainage member is reduced. Therefore, when the fluid feeding step in the above configuration is performed, the solid particles adhered to the surface of the drainage member are separated, and the passage of moisture on the surface of the drainage member becomes possible again. Therefore, according to the above configuration, even if the dewatering effect on the bag surface is reduced or eliminated due to the attachment of the solid particles as described above, the dewatering effect of the drainage member is restored by the fluid feeding step, so that the entire bag is formed. It is possible to maintain the dehydration effect.
[0016]
Further, the bag according to the present invention is a bag used for bag dehydration of a fluid containing solid particles, wherein the drainage for discharging the water in the fluid injected into the bag outside the bag. A member is arranged (claim 5).
[0017]
The bag having the above configuration is applicable to the above-described bagging and dewatering method, and has the same effects as those described above.
[0018]
Further, it is preferable that the drainage member is a tubular member having a self-retaining property (claims 3 and 6).
[0019]
According to the above configuration, since the drainage member is tubular, the internal space can be enlarged as compared with the case of a flat sheet shape, and the flow of water inside becomes good. In addition, when solid particles having a very small diameter such as silt enter into the drainage member, the particles may agglomerate, but even in such a case, since the internal space is large, the particles are agglomerated. Clogging of the solid particles can be prevented. And since the drainage member has a self-retaining property, the flow of water inside can be maintained well without the drainage member being deformed and crushed by the pressure from the fluid or the like.
[0020]
Further, it is preferable that a plurality of drainage members are arranged in the bag body (claims 4 and 7).
[0021]
According to the above configuration, the area related to dewatering is increased as compared with the case where the drainage member is single, and the dewatering effect is further improved. Therefore, construction in a shorter time is possible.
[0022]
Further, the bag may be watertight (claim 8).
[0023]
When a fluid that is likely to contain harmful substances such as dioxin, such as the bottom of a lake, is injected into a non-watertight bag, the harmful substances are discharged from the bag surface along with the moisture in the fluid. It is very environmentally problematic. Therefore, in this case, it is necessary to collect the surplus water discharged from the bag body surface. However, since the bag is usually large in size, it is a very difficult task to collect all excess water. Therefore, in the case of a fluid that may contain a harmful substance, a watertight bag is used to discharge surplus water only from the drainage member in the bag without discharging the water from the bag surface. This makes it possible to easily collect the surplus water without performing the above-described difficult work.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a state in which a bag-containing dewatering method for a fluid containing solid particles according to an embodiment of the present invention is performed. FIG. 2A shows a flow of a fluid and a flow of moisture in the fluid when the injection step and the drainage step are performed in the bagging and dewatering method according to the embodiment of the present invention shown in FIG. FIG. FIG. 2B is an explanatory diagram illustrating a flow of water when a water feeding step is performed in the bagging and dewatering method according to the embodiment of the present invention illustrated in FIG. 1.
[0025]
In the present embodiment, it is assumed that sediment of the seabed, that is, so-called sludge is used as the fluid.
[0026]
First, an apparatus configuration used in the bag dewatering method according to the present embodiment will be described.
[0027]
As shown in FIGS. 1 and 2 (a) and 2 (b), the bag body 1 has a substantially cylindrical shape with both ends in the longitudinal direction open, and includes four shape retaining hoses 2 as drainage members inside. I have. More specifically, one end in the longitudinal direction of the bag 1 has one opening, and the other end has a hose outlet and an inlet 5 thereunder for injecting a fluid. An opening at one end in the longitudinal direction of the bag 1 is closed by a metal fitting 7, and a hose outlet at the other end is provided with a through hole corresponding to each of the four shape retaining hoses 2 (one retaining hole in the figure). A hose holding plug 8 provided with a through hole corresponding to only the shaped hose 2) is provided. The hose holding plug 8 prevents the bottom material 10 injected into the bag 1 from leaking from the hose outlet of the bag 1.
[0028]
As shown in FIG. 1, one end is inserted into an injection hose 15 at the injection port 5 at the other longitudinal end of the bag body 1 during an injection step described later. The other end of the injection hose 15 is connected to a sand pump 31, and the sand pump 31 pumps the seabed sediment 10 into the injection hose 15.
[0029]
In addition, as a material of the bag body 1, general-purpose fibers such as polyester fibers and nylon fibers and high-strength fibers such as aramid can be used. The dimensions of the bag 1 are 2 m in diameter and 10 m in length.
[0030]
The four shape-retaining hoses 2 are arranged in the bag 1 along the longitudinal direction of the bag 1, and are held at predetermined intervals in the width direction of the bag 1 via the spacers 6. Have been. One end of each diameter retaining hose 2 arranged in the bag 1 is closed by, for example, sewing or bonding, and the other end is connected to a hose holding hole provided at a hose outlet at the other longitudinal end of the bag 1. Each of the plugs 8 is inserted into a through-hole, and is drawn out.
[0031]
The four shape retaining hoses 2 pulled out from the other end of the bag body 1 are each branched (FIG. 1 shows only a branch configuration of one shape retaining hose 2). One end and the other end of the shape retaining hose 2 are connected to a drainage tank 20 and a water supply pump 21 via valves 17 and 18, respectively.
[0032]
The shape-retaining hose 2 has a self-retaining property by using synthetic fibers for the warp and the weft, and using a rigid monofilament made of a wire or a synthetic resin, so-called bristle or the like, for a part of the weft. It is woven as.
[0033]
The spacer 6 is a substantially circular one having a through hole formed at the center thereof, the diameter of which is substantially the same as the outer diameter of the shape retaining hose 2, and a number of notches are formed on the outer periphery thereof. The surface of the diameter-retaining hose 2 comes into contact with the outer peripheral portion where the notch is formed.
[0034]
Next, the bagged dewatering method according to the present embodiment will be described. In performing the dehydration, the bag 1 has four shape-retaining hoses 2 installed at predetermined positions inside, an opening at one end in the longitudinal direction is closed by a metal fitting 7, and a hose outlet at the other end is a hose. This is a state where the injection port 5 is opened while being closed by the holding plug 8.
[0035]
First, as shown in FIG. 1, one end of the injection hose 15 is inserted into the injection port 5 of the bag 1, and the bottom 10 is pressure-fed into the bag 1 by the sand pump 31 (injection step). In performing the injection step, the valve 18 corresponding to the water feed pump 21 shown in FIG. 1 is closed, and the valve 17 corresponding to the drain tank is opened. As a result, surplus water of the sediment 10 discharged from the inside of the bag 1 through the inside of the shape retaining hose 2 is stored in the drainage tank 20 as described later.
[0036]
In FIG. 2A, the injection direction of the sediment 10 in the injection step is indicated by a thick white arrow, and the flow of moisture in the sediment 10 is indicated by a dotted arrow. As shown in FIG. 2 (a), the water in the sediment 10 injected into the bag 1 is discharged from the surface of the bag 1 to the outside, or from the surface of the shape-retaining hose 2 to the inside. It enters, moves to the hose outlet of the bag 1 through the inside, and is discharged out of the bag 1 (draining process).
[0037]
In this embodiment, the pouring step and the draining step are performed almost simultaneously.
[0038]
Next, water is fed into the shape-retaining hose 2 in a direction opposite to the flow of water in the shape-retaining hose 2 in the drainage process (water feeding process). In performing the water feeding step, the sand pump 31 shown in FIG. 1 is stopped operating, the valve 18 corresponding to the water feeding pump 21 is opened, and the valve 17 corresponding to the drainage tank is closed. Thereby, purified water containing no solid particles is fed into the shape retaining hose 2 in the direction of the arrow in FIG.
[0039]
The draining step is performed after a lapse of a predetermined time after performing the above-described pouring step and the draining step, and thereafter, the pouring step and the draining step are performed again, and the draining step is performed after the lapse of the predetermined time.
[0040]
As described above, according to the bag dewatering method for the fluid containing the solid particles according to the present embodiment, the water in the sediment 10 injected into the bag 1 passes through the surface of the bag 1. Not only is the air discharged by the shape-retaining hose 2 arranged in the bag 1 but also to the outside. In other words, since the shape-retaining hose 2 is arranged in the bag 1, the area for dehydration increases, and the dewatering effect increases as compared with the case where a bag without the shape-retaining hose 2 is used. Becomes shorter.
[0041]
Further, in the dehydration process, fine solid particles such as silt tend to adhere to the surface of the bag 1 and tend to enter the texture of the surface of the bag 1 and hinder the passage of moisture. Therefore, when dehydration is performed only through the surface of the bag 1, there is a concern that the dehydration effect during the operation may be reduced. However, in the present embodiment, dehydration is performed not only from the surface of the bag 1 but also from the shape-retaining hose 2. The problem of a decrease in the dehydration effect on the surface of the bag 1 can be reduced. Also in this regard, according to the present embodiment, it can be said that construction can be performed in a short time.
[0042]
Also, when the pouring step is completed, dehydration is completed almost at the same time, and a hard and strong bag 1 is obtained. Therefore, it is not necessary to leave the bag 1 after the pouring step, and the dehydration is completed in a short time, and the bags 1 can be stacked. Then, there is no large change in the thickness of the bag body 1 due to the subsequent dehydration, and the collapse of the embankment formed by stacking the bag bodies 1 is prevented.
[0043]
Further, even when the dehydration is not completely completed and a little moisture remains in the bag 1, dehydration by the shape retaining hose 2 is maintained by keeping the shape retaining hose 2 in the bag 1. The effect is maintained. Therefore, when the bags 1 are stacked to form an embankment or the like, even if moisture enters the bags 1 due to rainfall, the shape-retaining hose 2 functions as a drain material in the soil. Can be held.
[0044]
Furthermore, since it is not necessary to pour the sediment 10 again after stacking the bags 1 in the dehydration process, a large-scale operation of lifting the bags 1 is not required, and the construction work is easy, and the bags 1 are damaged. Problems are reduced.
[0045]
In addition, there is a concern that fine solid particles adhere to not only the surface of the bag 1 but also the surface of the shape-retaining hose 2 and the dewatering effect of the shape-retaining hose 2 is reduced. When the fluid feeding step is performed, the solid particles adhering to the surface of the shape-retaining hose 2 easily peel off, and the passage of moisture on the surface of the shape-retaining hose 2 becomes possible again. Therefore, according to the present embodiment, even if the dewatering effect on the surface of the bag 1 is reduced or eliminated due to the attachment of the solid particles as described above, the dewatering effect of the shape retaining hose 2 can be restored by the fluid feeding step. . Thereby, it is possible to maintain the dewatering effect of the bag 1 as a whole.
[0046]
Further, since the shape-retaining hose 2 is a tubular member having a self-retaining property, the internal space can be increased as compared with the case where a flat sheet-like member is used, and the flow of water inside is good. Become. In addition, if solid particles having a very small diameter such as silt enter into the shape-retaining hose 2, the particles may be aggregated. In addition, clogging of aggregated solid particles can be prevented. Since the shape-retaining hose 2 has a self-retaining property, the shape-retaining hose 2 is not deformed and crushed by the pressure of the sediment 10 in the bag body 2, so that the flow of water inside can be improved. Can be held.
[0047]
Further, since a plurality of the shape retaining hoses 2 are arranged in the bag body 1 at a distance, the area relating to dehydration is increased as compared with the case where a single arrangement hose is arranged, and the dehydration effect is further improved. Therefore, construction in a shorter time is possible.
[0048]
As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various design changes can be made within the scope of the claims.
[0049]
For example, in the above-described embodiment, the bottom of the seabed is used as the fluid, but various other substances including solid particles such as bottoms of lakes, marshes and rivers, excavation waste obtained by excavation work, etc. May be used.
[0050]
In addition, when excavated debris at the bottom of the ground with a lot of groundwater is used as a fluid, fine solid particles such as silt easily adhere to the surface of the bag 1 and the surface of the shape-retaining hose 2, and these particles enter the weave to prevent the passage of moisture. In addition, large particles other than fine particles, such as silt, tend to accumulate thereon and form a cake layer. Therefore, in this case, since there is a particular concern that the dewatering effect is reduced, it is desirable to perform the water feeding step in the above embodiment. In other words, in the case of using a fluid with a large amount of water containing fine particles such as excavation waste, the effect of using the water feeding step in the present invention is particularly exhibited.
[0051]
When the sediment of a lake or marsh is used as a fluid, the harmful substances such as dioxin are likely to be contained. It is desirable that 1 be watertight. When a fluid containing a harmful substance is injected into a bag that does not have water tightness, the harmful substance flows out from the surface of the bag together with the moisture in the fluid, which poses a serious environmental problem. Therefore, when a bag having no watertightness is used, it is necessary to collect surplus water discharged from the surface of the bag. However, since the bag is usually large in size, it is a very difficult task to collect all excess water. Therefore, in the case of a fluid that may contain harmful substances, a watertight bag is used so that surplus water is discharged only from the shape retaining hose 2 inside the bag without discharging the water from the bag surface. I do. This makes it possible to easily collect the surplus water without performing the above-described difficult work. In addition, as the bag having water tightness, for example, a synthetic resin such as urethane resin is extruded on the outer surface of the bag 1 used in the above-described embodiment, and the inner and outer surfaces are inverted to have a watertight layer on the inner surface. It is conceivable.
[0052]
The shape-retaining hose 2 is not limited to a woven fabric. For example, a resin hose in which a wire such as a wire is spirally arranged in a circumferential direction or a plastic hose in which a number of holes are formed. The surface of the pipe may be covered with a water-permeable cloth. That is, the shape retaining hose 2 may be any shape as long as a space through which the fluid can pass is secured without being deformed and closed by pressure when the fluid is injected into the bag 1. .
[0053]
In addition, it is not necessary that a plurality of the shape-retaining hoses 2 be arranged in the bag body 1, and a single shape-retaining hose 2 may be provided.
[0054]
Further, the shape retaining hose 2 does not necessarily have to be self-retaining or tubular. However, in order to discharge the water contained therein from the bag 1 satisfactorily, it is preferable to have a tubular shape having a self-retaining property as in the above embodiment.
[0055]
Further, although the pouring step and the draining step are performed almost simultaneously in the above-described embodiment, they may be performed in a staggered manner.
[0056]
Further, what is fed into the shape retaining hose 2 in the water feeding step is not limited to purified water, and various other fluids can be used.
[0057]
Further, the water feeding step can be omitted. However, in order to maintain the dewatering effect of the shape retaining hose 2, it is preferable to repeat the injection / drainage step and the water supply step.
[0058]
In the above-described embodiment, the inlet 5 for the fluid and the outlet for the shape-retaining hose 2 are provided on the other end side of the bag 1, and the shape-retaining hose 2 is moved by the flow of the fluid from the inlet 5. It is difficult to move. However, various configurations may be adopted, such as providing the fluid inlet 5 on the opposite side to the outlet of the shape-retaining hose 2, that is, on one end of the bag 1.
[0059]
【The invention's effect】
As described above, according to the first aspect, since the dewatering is performed not only from the bag body surface but also from the drainage member, the dewatering effect is increased, the construction time is shortened, and a large-scale work for lifting the bag body is not required. Is easy.
[0060]
According to the second aspect, by recovering the dewatering effect of the drainage member, it is possible to maintain the dewatering effect of the entire bag.
[0061]
According to the bag of the fifth aspect, the bag is applicable to the bag dewatering method according to the first and second aspects, and the same effects as described above can be obtained.
[0062]
According to the third and sixth aspects, the flow of water inside can be maintained well, and further, the clogging of the aggregated solid particles can be prevented.
[0063]
According to the fourth and seventh aspects, the dewatering effect is further improved, so that the construction can be performed in a shorter time.
[0064]
According to the eighth aspect, the present invention can be applied to a case where a fluid having a high possibility of containing a harmful substance such as dioxin is used as in the case of a sediment of a lake, for example, and surplus water containing a harmful substance can be easily collected.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a state in which a method for bag-packing and dehydrating a fluid containing solid particles according to an embodiment of the present invention is performed.
FIG. 2 (a) is a flow of a fluid and a flow of water in the fluid when an injection step and a drainage step are performed in the bag dewatering method according to one embodiment of the present invention shown in FIG. 1; FIG. (B) is an explanatory view showing a flow of water when a water feeding step is performed in the bagging and dewatering method according to the embodiment of the present invention shown in FIG. 1.
[Explanation of symbols]
1 bag 2 shape retention hose (drainage member)
10. Sediment (fluid)
20 Drainage tank 21 Water pump

Claims (8)

An injection step of injecting a fluid containing solid particles into the bag body,
A draining step of discharging the water in the injected fluid to the outside of the bag through the inside of a drainage member arranged in the bag, wherein a bag of the fluid containing solid particles is provided. Filling dewatering method. The method according to claim 1, further comprising a fluid feeding step of feeding a fluid into the drain member in a direction different from a direction in which water in the fluid is drained in the drain step. A method for dewatering a bag containing solid particles in a bag. The method according to claim 1 or 2, wherein the drainage member is a tubular member having self-retention. 4. The method of claim 1, wherein a plurality of the drainage members are arranged in the bag body. 5. In a bag used for bag dehydration of a fluid containing solid particles,
A bag body, wherein a drainage member for discharging the water in the injected fluid to the outside of the bag body is disposed in the bag body. The bag according to claim 5, wherein the drainage member is a tubular member having a self-retaining property. The bag according to claim 5, wherein a plurality of the drainage members are arranged in the bag inside. The bag according to any one of claims 5 to 7, wherein the bag has watertightness.

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