JPH09206513A - Sewing bag for bagged dehydration - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a sewn bag for bagging and dewatering, which can be dehydrated without leaking sludge even when it is made large and which can be stacked in multiple stages so that the internal pressure increases. SOLUTION: In a sewing bag for dehydration in which water-permeable cloths 1a, 1b are sewn into a bag shape, water-absorbent sheet bodies 2a, 2b containing superabsorbent polymer are provided on both outer surfaces of overlapped cloth stitched portions. It is characterized in that the water absorbing sheet body and the cloth of the sewn portion are integrally sewn.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fabric sewing bag,
More specifically, the present invention relates to a sewn bag for bagging and dehydration, which is suitable for injecting a high water content clay and preventing the clay from leaking out for dehydration.

[0002]

2. Description of the Related Art Conventionally, a method of injecting a highly water-containing material into a water-permeable cloth bag and performing dehydration under a restrained state has been carried out in various industrial fields. For example, in the field of civil engineering, there is a demand that the sludge removed by dredging be effectively used as an embankment material without being transported to a treatment plant. There is disclosed a mechanical dehydration method in which an airtight sheet is covered so as to wrap the entire group of stacked bags, and the inside of the airtight sheet is depressurized using a vacuum pump to perform forced dehydration. Further, JP-A-57-132596 discloses a method in which sludge-like mud mixed with a solid agent is enclosed in a water-permeable bag and then dehydrated under reduced pressure to be solidified.

Since the water-permeable bag used in these dehydration methods is originally based on sandbags, it is generally of a small capacity. However, with the expansion of dredging amount and the speeding up of dredging due to the development of the dredging machine, the water permeable bag body also tends to be large in size today. The sludge that is injected into the water-permeable bag is not limited to the alluvial clay layer, and sludge that emits a foul odor must be handled.

[0004]

The water-permeable bag used in the conventional bagging and dehydrating method described above has a limit in increasing the density of the cloth for the purpose of separating water from sludge by leaching and dehydration. . That is, it is necessary that a predetermined space be provided between the fabric fibers, and a fiber having a relatively large fiber gap is used. This means that the fibrous structure is loose, and therefore, when an external force is applied, the fibrous structure slips and the distance increases. The voids generated thereby expand beyond a size suitable for separating sludge and water, and the sludge leaks from the enlarged voids.

[0005] In a water-permeable bag that is made large in size for a dredging machine, the internal pressure acting on the water-permeable bag increases and the bag is greatly deformed. Slips easily. In addition, a large diameter of the sewing needle may cause a void exceeding the appropriate size. Further, the sewing thread itself may not be able to withstand an external force and may be partially cut, so that the sewing thread itself may be stretched and stretched. The restraint may be loosened to cause voids.

In any case, sludge leaks from the sutured portion, which cannot occur in the conventional small permeable bag,
If a large amount of sludge that leaks out gives off a bad odor, it may contaminate the surrounding environment and cause social problems.

The present invention has been made in consideration of the problems in the conventional water-permeable bag used in the bag-packing dehydration method as described above, and ensures dehydration without leaking sludge even when the bag is enlarged. It is an object of the present invention to provide a bag-type dewatering sewing bag that can be carried out and can be stacked in multiple stages such that the internal pressure increases.

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to a dehydration sewing bag in which a water-permeable cloth is sewn into a bag shape to absorb water containing a superabsorbent polymer on both outer surfaces of the overlapped cloth stitched portions. A sewn bag for bagging and dehydration, in which a sheet body is disposed, and the water absorbing sheet body and the cloth of the stitched portion are sewn together.

The cloth constituting the above-mentioned sewing bag can be composed of a fiber sheet such as a non-woven fabric, a woven fabric or a knitted fabric,
As the material for the fiber sheet, either natural fibers or synthetic fibers can be used. The sewn portion refers to a sewn portion for making the cloth into a bag shape by using a sewing thread, but is not limited to the sewn portion that contributes to the bag shape, and a portion attached to the sewing bag, for example, a tubular shape. It also includes the sutured part of the inlet. That is, the sewing bag includes a portion where the internal pressure acts. However, since the hem of the inlet is sewn to the peripheral edge of the opening of the bag, the water absorbing sheet in this case is attached only to the outer side surface of the sewn portion.

The bag-dewatering sewing bag of the present invention is preferably applied to sandbags used in the bag-dehydration method. Also,
Since it can be made larger than the conventional sandbag, it can be applied to a dredging machine with an improved dredging amount and dredging speed.

The superabsorbent polymer contained in the water-absorbent sheet of the present invention is a polyacrylic acid-based copolymer, an acrylic resin including a vinyl acrylate vinyl alcohol copolymer, or a polyvinyl alcohol (PVA) maleic acid ester-based copolymer. It may be a synthetic polymer such as an acrylic resin such as, and other synthetic polymer such as polyethylene oxide, or a cellulose such as a starch type or a crosslinked body of carboxymethyl cellulose (CMC). It may be a natural polymer.

The morphology of these superabsorbent polymers is usually
It is in the form of powder, powder, granules, gel, or liquid, and can be formed into a sheet by forming a composite by combining it with vinyl chloride resin, EVA, rubber, or the like. Further, it can be formed into a sheet shape by being sandwiched between non-woven fabrics and films, or coated on non-woven fabrics and films. When a fibrous superabsorbent polymer made of a polyacrylic acid acrylamide copolymer is used, it can be directly processed into a non-woven fabric to be formed into a sheet. The water-absorbent sheet body containing the superabsorbent polymer of the present invention may be in any of the forms described above.

A sheet body containing the superabsorbent polymer is
All of them swell when they come into contact with water and their own weight is 30-
It can absorb about 4000 times the weight of water. Then, the water-absorbed sheet body swells to close the voids present in the vicinity of the sheet body. In other words, the water will be taken in and stopped.

According to the present invention, when a high water content clay is injected into a bag for dehydration in a bag and the internal pressure of the bag increases, dehydration starts through the fibrous structure gaps in the cloth of the bag and stress is applied to the cloth sewn portion. When water is concentrated and a void exceeding the proper size occurs in the seam, the water content of the high water content clay that leaks through the void is absorbed by the super absorbent polymer of the water absorbent sheet and the water absorbent sheet swells. Then, the gap is closed. This ensures that the clay content of the high water content clay remains in the sewing bag and is only dehydrated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a sewing bag for dehydration in a bag according to an embodiment of the present invention (hereinafter simply referred to as a sewing bag).
3 shows a sutured part of the above. In the figure, sewing bag 1
Is a bag-like structure in which water-permeable cloth sheets 1a and 1b are stitched together. 2a and 2b are respectively provided, and the water absorbing sheets 2a and 2b and the fabrics 1a and 1b of the sewn portion A are sewn together by using a sewing thread 3.

2 to 6 show a modification of the form of the stitched portion. In these figures, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 2, one water-absorbent sheet 2c is folded back in a U-shape so as to wrap both outer sides of the fabric sheet stitching portion A. According to this configuration, it is possible to further improve the sewing workability and the water leakage prevention effect as compared with the configuration of FIG.

In FIG. 3, one cloth sheet 1c is arranged longer than the other cloth sheet 1b, two water absorbing sheets 2a and 2b are arranged on both outer sides of the cloth sheet stitching portion A, and one cloth sheet 1c is arranged. In the folded state, the water absorbent sheets 2a and 2b, the fabric sheets 1a and 1b in the stitched portion, and the folded-back portion 1d are sewn together using the sewing thread 3.

In FIG. 4, both fabric sheets 1e and 1f are U-shaped.
The water absorbent sheets 2a and 2b are folded back in a character shape, and the water absorbent sheets 2a and 2b are arranged outside the one fabric sheet 1e and inside the folded portion, respectively, and are sewn together.

In FIG. 5, the fabric sheets 1i and 1j are superposed in a state of being opposed to each other, the water absorbing sheets 2a and 2b are arranged on both outer surfaces of the superposed portion, and they are integrally sewn together.

In FIG. 6, the fabric sheets 1k and 1l are laid on each other and laid on each other, and the water absorbing sheets 2a and 2b are arranged on both outer surfaces of the hung portion B, and are sewn together. is there.

[0021]

EXAMPLE A 500-denier polyester, vertical × horizontal density 28 woven / in × 28 woven / in plain woven fabric was sewn into a bag shape in the size shown in FIG. 7, and the injection port 10 was one end in the longitudinal direction of the fabric sheet 1a. I set it near. The figure (a) shows the top view, the figure (b) shows the front view,
The figure (c) is an enlarged view of the portion C shown in the figure (b). The water-absorbent sheet 2c is arranged in a frame shape at the periphery of the cloth sheets 1a and 1b, respectively, and integrated with the cloth sheets 1a and 1b. Sutured.

The woven fabric constituting the fabric sheet has a water permeability of 1.6 × 10 ^-2 c / s and a thickness of 0.22 mm. The stitching was performed using a lockstitch, two-needle sewing machine according to the method shown in FIG. The cylindrical inlet 10 has a brim-shaped hem at its lower end, and the water absorbing sheet 2d has an annular shape corresponding to the hem.
The water absorbing sheet 2d, the hem and the fabric sheet 1a.
The peripheral edge of the opening formed in was sewn together.

Further, as shown in FIG. 8, as a comparative example, a sewing bag having no water absorbing sheet was prepared in the same size as above. The number of sewn bags produced is 5 in each of this example and the comparative example.

The water-absorbent sheet used in this example is a water-swellable sheet having a thickness of 1.5 mm obtained by mixing a polyacrylic acid salt-based highly water-absorbent polymer with vinyl chloride resin. As the high water content clay, clay having the soil characteristics shown in Table 1 below was used and adjusted to a uniform slurry state having a water content of 350% in a soil tank.

[0025]

[Table 1]

Next, the high water content clay was pressure fed from the earth tank 21 to the sewing bag 1 for dehydration by using the mono pump 20 shown in FIG. The injection rate is 0.15 m ³ / min and the injection pressure is 0.10 kgf / cm ² . Reference numeral 22 in the figure is a pressure resistant hose that connects the soil tank 21, the mono-pump 20, and the dehydration sewing bag 1.

As a result of injecting an injection amount of 3.2 m ³ into both the sewing bag for dehydration of this embodiment and the comparative example, the thickness of the bag after injection was 80 cm. At this time, in the case of the comparative example, from the time when the injection of about 2 m ³ was completed, the inner side stitch row of the bag was formed in two stitch rows that were formed in parallel by sewing the two needles for the lock stitch. The stress was concentrated on the woven fabric, the woven fabric was locally slipped, and the sludge oozes out from the inner stitch row, and when the thickness reaches 80 cm, the sludge blows out like a fountain. On the other hand, no leakage of sludge was observed in the five sewn bags of this example.

The material of the cloth in the present invention is made of synthetic fiber in the above embodiment, but it is not limited to this and may be made of natural fiber. Further, the structure of the cloth is not limited to the woven fabric of the embodiment, but may be composed of a non-woven fabric, a knitted fabric or the like.

The sewn portion in the present invention refers to a sewn portion for making the fabric into a bag shape by using a sewing thread, but is not limited to the sewn portion that contributes to the bag shape, and is attached to the sewing bag. It also includes a portion to be sewn, for example, a sutured portion of the injection port. That is, it includes all the parts of the sewing bag where the internal pressure acts. Further, the sewn bag for bagging and dehydrating of the present invention can be applied not only to the injection of the high water content ratio clay shown in the examples but also to the dehydration of a large amount of any high water content product.

[0030]

As is apparent from the above description,
According to the bag-type dehydration sewing bag of the present invention, since the weight of the entire sewing bag in which the water-containing material has been injected is extremely large, dehydration is performed without applying a special load, and the bag is highly filled with the water-containing material. Even if the fabric fibers in the sewn portion are blinded by the internal pressure to form voids, the water content of the water-containing substance itself and the superabsorbent polymer act to swell the water-absorbent sheet body and close the voids. Therefore, even if the sewn bag for bag dehydration is enlarged, only dehydration can be surely performed without leaking contaminants such as sludge.

When the present invention is applied to the bag-packing dehydration method in the dredging work of rivers, harbors, lakes and marshes, it is advantageous for multi-tiered stacking in which the internal pressure increases. The sludge, which was treated only as industrial waste, can be effectively used as a construction material for revetment.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a stitched portion of a dehydration sewing bag according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a first modified example of the sutured portion according to the embodiment.

FIG. 3 is a sectional view showing a second modification of the same.

FIG. 4 is a sectional view showing a third modification of the same.

FIG. 5 is a sectional view showing a fourth modification of the same.

FIG. 6 is a sectional view showing a fifth modification of the same.

FIG. 7 is an explanatory diagram showing a configuration of a dehydration sewing bag according to an embodiment.

FIG. 8 is an explanatory diagram showing a configuration of a dehydration sewing bag of a comparative example.

FIG. 9 is an explanatory diagram showing a configuration of a high water content clay injecting device according to an embodiment.

[Explanation of symbols]

 1 Dewatering sewing bag 1a, 1b Cloth sheet 2a, 2b Water absorbent sheet 3 Sewing thread 10 Pouring port A Cloth stitching part B Entry part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Miki 1 Asahi, Tsukuba City, Ibaraki Prefectural Civil Engineering Research Institute (72) Inventor Tetsuya Yamada 1 Asahi, Tsukuba City, Ibaraki Prefectural Civil Engineering Research Institute (72) Inventor Shohei Senda 1-6-4 Taito, Taito-ku, Tokyo Inside Foundation Civil Engineering Research Center (72) Inventor Nobuaki Wada 1-6-4 Taito, Taito-ku Tokyo Metropolitan Government Civil Engineering Research Center (72) Inventor Eiichi Taki 2-2-8 Dojimahama, Kita-ku, Osaka Toyo Boseki Co., Ltd. (72) Inventor Hiroshi Kokubo 1534-1, Nishi-Nasuno-cho, Nasu-gun, Tochigi Prefecture Goyo Construction Co., Ltd.

Claims (2)

[Claims] 1. A dewatering sewing bag in which a water-permeable cloth is sewn into a bag shape, and a water-absorbent sheet body containing a superabsorbent polymer is provided on both outer sides of the overlapped cloth sewn portions. A bag for dehydrating sewn bags, characterized in that the water absorbent sheet body and the cloth of the sewn portion are sewn together. 2. The sewn bag for bag dehydration according to claim 1, wherein the sewn bag for bag dehydration is a sandbag used in the bag dehydration method.