JP4094476B2 - Dewatering method for packing fluid containing solid particles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bag packed dehydrating method of the fluid containing the solid particles, sacked dehydrating method of sludge particularly containing fine solid particles such as excavation shear sediment and excavation of the seabed, lakes and rivers about the.
[0002]
[Prior art]
Used as a method of reusing seabed, lakes, riverbed sediments, excavation excavation sludge, etc., to inject water into a permeable bag and dewatering it to make it stronger and use it to form embankments, etc. It is possible. In such reuse, when the bags are stacked, large settlement due to dehydration is likely to occur, so it is difficult to set the embankment to a predetermined height. Therefore, in order to form a levee with a predetermined height, the clay infused clay was put in a stacked state, the moisture in the clay was dehydrated from the bag by self-weight consolidation and sun drying, and the solid inside the bag There has been proposed a method in which an amount of clay approximately equal to the amount of water dehydrated when the thickness becomes smaller than the initial value is poured again into each bag (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Publication No. 8-19647 (2nd page, Fig. 3)
[0004]
[Problems to be solved by the invention]
However, according to the above document, since a fluid such as clay is poured into the bag and then left to dehydrate, there is a problem that it takes time for construction.
[0005]
Moreover, since it is the structure which inject | pours clay into each of the stacked bag bodies again, when inject | pouring into the bag body arrange | positioned at the lower side, it is necessary to lift the bag body arrange | positioned at the upper side. Therefore, a large-scale operation of lifting the weight of the bag body filled with clay or the like is required, and the bag body may be damaged.
[0006]
In addition, when the bag bodies are stacked and dehydrated one layer at a time without dehydration, the dehydration and injection are repeated for each layer, so that the construction time is significantly increased.
[0007]
It is an object of the present invention, while reducing the problem of bag is damaged construction relatively short time and easily, and to provide a bag packed dehydrating method of the fluid containing the solid particles .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a method for filling and dehydrating a fluid containing solid particles according to the present invention includes an injection step of injecting a fluid containing solid particles into the bag body, and a drainage member disposed in the bag body. The fluid is sent to the inside of the drainage member in a direction different from the drainage process for draining the moisture in the injected fluid out of the bag through the interior of the fluid and the direction of draining the moisture in the fluid in the drainage process. A fluid feeding step for entering, and repeatedly performing the injection step, the draining step, and the fluid feeding step (claim 1).
[0009]
According to the said structure, the water | moisture content in the fluid inject | poured in the bag body is discharged | emitted not only through the bag body surface but by the drainage member arrange | positioned in the bag body. That is, since the drainage member is arranged in the bag body, the area related to dehydration increases, and the dehydration effect is increased compared to 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 are likely to adhere to the bag body surface, which tends to enter the texture of the bag body surface and prevent the passage of moisture. Therefore, when dehydrating only through the bag body surface, there is a concern that the dewatering effect during work will be reduced, but in the above configuration, dewatering is performed not only from the bag body surface but also from the drainage member, and the dewatering effect on the bag body surface The problem of decline can be reduced. Also in this respect, according to the above configuration, it can be said that the construction time is shortened.
[0011]
The injection process and the drainage process can be performed almost simultaneously, and when the injection process is completed, dehydration is completed almost simultaneously and a hard and strong bag body is obtained. Therefore, it is not necessary to leave the bag body after finishing the injection process, and the bag body can be stacked after dehydration is completed in a short time. And there is no big thickness change of a bag body by subsequent dehydration, and it is also prevented that the embankment etc. which were formed by stacking a bag body collapse.
[0012]
Further, even when the dehydration is not completely completed and some moisture remains in the bag body, the dewatering effect by the drainage member is maintained by keeping the drainage member provided in the bag body. Therefore, when the bag bodies are stacked to form a bank, etc., even if moisture enters the bag body due to rain, the drainage member functions as a drain material in the soil, so that the bag body can be firmly held. .
[0013]
Furthermore, since it is not the structure which inject | pours a fluid again after stacking a bag body like the prior art mentioned above, the large-scale work which lifts a bag body is also unnecessary, construction work is easy, and the problem which a bag body breaks also occurs. It is reduced.
[0015]
In addition, as described above for the bag body surface, there is a concern that fine solid particles may adhere to the surface of the drainage member, and the dewatering effect of the drainage member will be reduced. Therefore, when the fluid feeding step in the above configuration is performed, the solid particles attached to the surface of the drainage member are peeled off, and moisture can pass again on the surface of the drainage member. Therefore, according to the above configuration, even if the dewatering effect on the surface of the bag body is reduced or eliminated due to the adhesion of solid particles as described above, the dewatering effect of the drainage member is restored by the fluid feeding step, so that the bag body as a whole It is possible to retain the dehydration effect.
[0018]
Moreover, it is preferable that the drainage member is a tubular member having a self-retaining property (claim 2) .
[0019]
According to the said structure, since a drainage member is tubular, internal space can be enlarged compared with the case of a flat sheet form, and the flow of water inside becomes favorable. In addition, when solid particles having a very small diameter having a viscosity such as silt enter the drainage member, the particles may agglomerate. It is possible to prevent clogged solid particles. And since a drainage member has self-shape-holding property, the flow of water inside can be hold | maintained favorably, without a drainage member deform | transforming and being crushed by the pressure from a fluid.
[0020]
In addition, it is preferable that a plurality of drainage members are arranged separately in the bag (claim 3) .
[0021]
According to the said structure, the area which concerns on dehydration increases compared with the case where the number of drainage members is single, and the dehydration effect improves further. Therefore, construction in a shorter time is possible.
[0022]
In addition, the bag is not good even as it has a water-tightness.
[0023]
If a fluid that is likely to contain dioxins or other harmful substances, such as lake sediments, is injected into a bag that does not have water tightness, harmful substances will be released from the bag surface to the outside along with moisture in the fluid. It becomes a very environmental problem. Therefore, in this case, it is necessary to recover excess water discharged from the bag body surface. However, since the bag body is usually large in size, it is very difficult to collect all excess water. Therefore, in the case of a fluid that may contain harmful substances, a water-tight bag is used so that excess water is discharged only from the drainage member in the bag without discharging from the bag surface. Thereby, it becomes possible to easily collect surplus water without performing the above-mentioned difficult work.
[0024]
DETAILED DESCRIPTION OF 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 when performing a bagging and dehydrating method for a fluid containing solid particles according to an embodiment of the present invention. FIG. 2A shows the flow of fluid and the flow of moisture in the fluid when the filling step and the draining step are performed in the bagging and dehydrating method according to the embodiment of the present invention shown in FIG. It is explanatory drawing. FIG.2 (b) is explanatory drawing which shows the flow of the water at the time of a water feeding process performed in the bagging dehydration method which concerns on one embodiment of this invention shown in FIG.
[0025]
In this embodiment, the bottom sediment of the seabed, so-called sludge is used as the fluid.
[0026]
First, an apparatus configuration used in the bag filling and dehydrating method according to the present embodiment will be described.
[0027]
As shown in FIG. 1 and FIGS. 2 (a) and 2 (b), the bag body 1 has a substantially cylindrical shape whose both ends in the longitudinal direction are open, and includes four shape retaining hoses 2 as drainage members inside. Yes. More specifically, one end in the longitudinal direction of the bag body 1 has one opening, and the other end has a hose outlet and an inlet 5 for injecting fluid below the hose outlet. The opening at one end in the longitudinal direction of the bag body 1 is closed by a metal fitting 7, and through holes (one retaining hole in the figure) corresponding to each of the four shape retaining hoses 2 are formed in the hose outlet of the other end. A hose holding plug 8 in which a through hole corresponding to only the hose 2 is shown) is provided. The hose holding plug 8 prevents the sediment 10 injected into the bag body 1 from leaking from the hose outlet of the bag body 1.
[0028]
As shown in FIG. 1, one end of the injection port 5 at the other end in the longitudinal direction of the bag body 1 is inserted into the injection hose 15 during an injection process described later. The other end of the injection hose 15 is connected to a sand pump 31, and the sediment 10 on the seabed is pumped into the injection hose 15 by the sand pump 31.
[0029]
In addition, as a material of the bag 1, general-purpose fibers such as polyester fiber and nylon fiber, and high-strength fibers such as aramid can be used. The size of the bag 1 is 2 m in diameter and 10 m in length.
[0030]
The four shape retaining hoses 2 are arranged in the bag body 1 along the longitudinal direction of the bag body 1, and are held so as to be separated from each other at a predetermined interval in the width direction of the bag body 1 through the spacer 6. Has been. One end arranged in the bag body 1 in each diameter retaining hose 2 is closed by, for example, sewing or bonding, and the other end is a hose holding provided in the hose outlet at the other longitudinal end of the bag body 1. The plugs 8 are respectively inserted into the insertion holes and drawn out.
[0031]
The four shape retaining hoses 2 drawn from the other end of the bag body 1 are branched (only the branched configuration of one shape retaining hose 2 is shown in FIG. 1). One end and the other end of the shape-keeping hose 2 are connected to a drain tank 20 and a water feed pump 21 via valves 17 and 18, respectively.
[0032]
The shape-retaining hose 2 has a self-retaining property by using a synthetic fiber for the warp and the weft, and using a monofilament having rigidity made of a wire or a synthetic resin, a so-called bristle for a part of the weft. As woven.
[0033]
The spacer 6 has a substantially circular shape in which a through hole having a diameter substantially the same as the outer diameter of the shape retaining hose 2 is formed at the center, and a large 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 bag filling and dehydrating method according to the present embodiment will be described. In the dehydration, the bag body 1 has four shape-keeping hoses 2 installed at predetermined positions inside, the opening at one end in the longitudinal direction is closed by a metal fitting 7, and the hose outlet at the other end is a hose. The inlet 5 is opened while being closed by the holding stopper 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 body 1, and the sediment 10 is pumped into the bag body 1 by the sand pump 31 (injection process). In performing the injection process, the valve 18 corresponding to the water feed pump 21 shown in FIG. 1 is closed, and the valve 17 corresponding to the drainage tank is opened. Thereby, surplus water of the bottom sediment 10 discharged from the bag body 1 through the inside of the shape retaining hose 2 as described later is stored in the drainage tank 20.
[0036]
In FIG. 2A, the injection direction of the bottom sediment 10 in the injection step is indicated by a thick white arrow, and the flow of moisture in the bottom sediment 10 is indicated by a dotted arrow. As shown in FIG. 2 (a), the moisture in the sediment 10 injected into the bag body 1 is discharged to the outside from the surface of the bag body 1 or from the surface of the shape retaining hose 2 to the inside. It enters, moves to the hose outlet of the bag body 1 through the inside, and is discharged out of the bag body 1 (drainage process).
[0037]
In this embodiment, the injection process and the drainage process are performed almost simultaneously.
[0038]
Next, water is fed into the shape retaining hose 2 in the direction opposite to the flow of moisture in the shape retaining hose 2 in the draining step (water feeding step). In performing the water feeding process, the sand pump 31 shown in FIG. 1 is stopped, the valve 18 corresponding to the water feeding pump 21 is opened, and the valve 17 corresponding to the drain tank is closed. Thereby, purified water not containing solid particles is fed into the shape retaining hose 2 in the direction of the arrow in FIG.
[0039]
MizuokuIri step is carried out after the above injection step and drainage step after a predetermined time has elapsed, then performs again implantation step and drainage step, also performs MizuokuIri step after a predetermined time has elapsed, the work of, repeated until complete dehydration .
[0040]
As described above, according to the bag filling and dewatering method for a fluid containing solid particles according to the present embodiment, the moisture in the bottom material 10 injected into the bag body 1 passes through the surface of the bag body 1. In addition to the shape-retaining hose 2 disposed in the bag body 1, it is discharged to the outside. That is, since the shape retention hose 2 is arranged in the bag body 1, the area for dehydration increases, and the dewatering effect is increased compared to the case of using a bag body that does not include the shape retention hose 2. Becomes shorter.
[0041]
Further, in the dehydration process, fine solid particles such as silt are likely to adhere to the surface of the bag body 1, and this tends to enter the texture of the surface of the bag body 1 and prevent the passage of moisture. Therefore, when dehydration is performed only through the surface of the bag body 1, there is a concern that the effect of dehydration during work is reduced, but in this embodiment, dehydration is performed not only from the surface of the bag body 1 but also from the shape retaining hose 2, The problem of reduced dehydration effect on the surface of the bag body 1 can be reduced. Also in this respect, according to the present embodiment, it can be said that construction in a short time becomes possible.
[0042]
Moreover, dehydration is completed almost simultaneously with the completion of the injection process, and a bag body 1 having a high strength is obtained. Therefore, it is not necessary to leave the bag body 1 after finishing the injection process, and the bag body 1 can be stacked after dehydration is completed in a short time. And there is no big thickness change of the bag body 1 by subsequent dehydration, and it is also prevented that the embankment etc. which were formed by stacking the bag bodies 1 collapse.
[0043]
Further, even when the dehydration is not completely completed and a little moisture remains in the bag body 1, the shape retaining hose 2 is left in the bag body 1 so that the dewatering by the shape retaining hose 2 is performed. The effect is retained. Therefore, when the bag bodies 1 are stacked to form a bank, etc., even if moisture enters the bag body 1 due to rain, the shape retaining hose 2 functions as a drain material in the soil. Can be held in.
[0044]
Furthermore, since it is not necessary to inject bottom sediment 10 again after stacking bag body 1 in the dehydration process, there is no need for a large-scale work for lifting bag body 1, construction work is easy, and bag body 1 is damaged. Problem to be reduced.
[0045]
Moreover, although there is a concern that fine solid particles adhere not only to the surface of the bag body 1 but also to the surface of the shape-retaining hose 2 and the dehydrating effect of the shape-retaining hose 2 is reduced, as in the present embodiment. When the fluid feeding step is performed, the solid particles attached to the surface of the shape-retaining hose 2 are easily separated, and moisture can pass again on the surface of the shape-retaining hose 2. Therefore, according to the present embodiment, even if the dewatering effect on the surface of the bag body 1 is reduced or eliminated due to the adhesion of solid particles as described above, the dewatering effect of the shape retaining hose 2 can be restored by the fluid feeding process. . Thereby, it is possible to hold | maintain the dehydration effect as the bag body 1 whole.
[0046]
In addition, since the shape retaining hose 2 is a tubular member having self-shape retaining properties, the internal space can be increased as compared to the case of using a flat sheet-shaped member, and the flow of water inside is good. Become. In addition, when solid particles having a very small diameter having a viscosity such as silt enter into the shape retaining hose 2, the particles may aggregate. However, even in such a case, since the tubular shape can take a large internal space, It is possible to prevent clogging of the aggregated solid particles. And since the shape-retaining hose 2 has the self-retaining property, the shape-retaining hose 2 is not deformed and crushed by the pressure of the bottom material 10 in the bag body 2, and the flow of water inside is improved. Can be held.
[0047]
Moreover, since the shape-retaining hose 2 is arranged at a plurality of distances in the bag body 1, the area related to dehydration is increased as compared with the case of arranging a single hose 2, and the dehydration effect is further improved. Therefore, construction in a shorter time is possible.
[0048]
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims.
[0049]
For example, as the fluid, the bottom sediment of the seabed is used in the above-described embodiment. However, various other materials may be used as long as they contain solid particles, such as bottom sediment of lakes and rivers, excavation sludge obtained by excavation work, etc. You may use things.
[0050]
In addition, when using a ground excavation gap with a lot of groundwater as a fluid, fine solid particles such as silt are likely to adhere to the surface of the bag body 1 and the shape retaining hose 2, and these particles enter the texture and allow moisture to pass through. In addition, large particles other than fine particles such as silt tend to accumulate on top of it, creating a cake layer. Therefore, in this case, since there is a particular concern about a decrease in the dewatering effect, it is desirable to perform the water feeding step in the above-described embodiment. In other words, when using a fluid with a large amount of water including fine particles such as excavation sludge, the effect when the water feeding step in the present invention is used is particularly exhibited.
[0051]
In addition, when using the bottom sediment of the lake as a fluid, it is highly likely to contain harmful substances such as dioxin. Therefore, in order to prevent harmful substances from leaking from the surface of the bag body 1, the bag body It is desirable that 1 be watertight. When a fluid containing a harmful substance is injected into a bag body that does not have watertightness, the harmful substance comes out from the bag body surface together with the moisture in the fluid body, which causes a very environmental problem. Therefore, when using the bag body which does not have watertightness, it is necessary to collect | recover the excess water discharged | emitted from the bag body surface. However, since the bag body is usually large in size, it is very difficult to collect all excess water. Therefore, in the case of a fluid that may contain harmful substances, a water-tight bag is used so that excess water is discharged only from the shape retaining hose 2 in the bag without discharging from the bag surface. To do. Thereby, it becomes possible to easily collect surplus water without performing the above-mentioned difficult work. In addition, as a bag body which has watertightness, for example, a synthetic resin such as urethane resin is extruded on the outer surface of the bag body 1 used in the above-described embodiment, and a watertight layer is provided on the inner surface by inverting the inner and outer surfaces. Can be considered.
[0052]
The shape-retaining hose 2 is not limited to a woven one. For example, a resin hose in which a wire such as a wire is spirally arranged in the circumferential direction or a plastic in which a large number of holes are formed. The surface of the pipe may be covered with a water permeable cloth. In other words, the shape-retaining hose 2 may be any as long as a space through which a fluid can pass is secured without being deformed and blocked by pressure when the fluid is injected into the bag body 1. .
[0053]
Further, it is not necessary that a plurality of shape retaining hoses 2 are arranged in the bag body 1, and a single shape retaining hose 2 may be provided.
[0054]
Further, the shape-retaining hose 2 is not necessarily required to be self-retaining or tubular. However, it can be said that it is preferable to have a self-shape-retaining property and to have a tubular shape as in the above-described embodiment in order to discharge moisture contained in the bag body 1 satisfactorily.
[0055]
Moreover, although the injection | pouring process and the drainage process are performed substantially simultaneously in the above-mentioned embodiment, you may shift and perform.
[0056]
Moreover, what is fed into the shape retaining hose 2 in the water feeding process 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 dehydration effect by the shape-retaining hose 2, it is preferable to repeat the pouring / draining process and the water feeding process.
[0058]
Further, in the above-described embodiment, the fluid inlet 5 and the shape retaining hose 2 outlet are provided on the other end side of the bag body 1, and the shape retaining hose 2 is moved by the fluid flowing from the inlet 5. It is difficult to move. However, various configurations may be employed, such as providing the fluid inlet 5 on the side opposite 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 dewatering is performed not only from the bag body surface but also from the drainage member, the dewatering effect is improved and the construction time is shortened, and a large work for lifting the bag body is not necessary. Is easy.
[0060]
Moreover, it is possible to retain the dewatering effect of the entire bag body by restoring the dewatering effect of the drainage member.
[0062]
According to the second aspect, the flow of water inside can be maintained well, and further, the clogged solid particles can be prevented from being clogged.
[0063]
According to the third aspect, construction can be performed in a shorter time by further improving the dehydration effect.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a state when performing a bagging and dehydrating method for a fluid containing solid particles according to an embodiment of the present invention.
2A is a flow of a fluid and a flow of moisture in the fluid when an injection step and a drainage step are performed in the bag filling and dewatering method according to the embodiment of the present invention shown in FIG. It is explanatory drawing which shows. (B) is explanatory drawing which shows the flow of the water at the time of a water feeding process performed in the bagging dehydration method which concerns on one embodiment of this invention shown in FIG.
[Explanation of symbols]
1 Bag 2 Shape retention hose (drainage member)
10 Bottom sediment (fluid)
20 Drainage tank 21 Water feed pump

Claims (3)

An injection step of injecting a fluid containing solid particles into the bag;
A drainage step of discharging the water in the injected fluid out of the bag through the inside of the drainage member arranged in the bag,
A fluid feeding step of feeding a fluid into the drainage member in a direction different from the direction of draining the water in the fluid in the draining step,
A method for packing and dehydrating a fluid containing solid particles, wherein the injection step, the drainage step, and the fluid feeding step are repeated . 2. The bag filling and dewatering method for a fluid containing solid particles according to claim 1, wherein the drainage member is a tubular member having a self-holding property. 3. The bag filling and dewatering method for a fluid containing solid particles according to claim 1 or 2 , wherein a plurality of the drainage members are arranged separately in the bag body.

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