JP2007126902A - Impervious structure, and protective mat and bag body used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impervious structure, and a protective mat and a bag body used for the impervious structure allowing steepening of a face of slope while supporting a covering layer stably to the face of slope. <P>SOLUTION: In the impervious structure, an impervious sheet 9 protected by the protective mats 8, 10 is laid along the face of slope formed on a shore, and the bag body 11 filled with a soil filler is further laid on the upper face of the protective mat 10. Antislip treatment is applied to at least the bag body contact surface side of the protective mat 10 or at least the protective mat contact surface side of the bag body 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water shielding structure suitable for building a seawall, a protective mat used therefor, and a bag.

  In the current situation where land disposal sites are tight, waste sea surface treatment plants where landfill disposal sites are installed in the sea are becoming popular.

  This kind of waste sea surface treatment plant is expected to increase in demand because it is located on the most downstream side of the water source and has a water-impervious structure stipulated by laws and regulations with relatively little impact on the environment. .

  As shown in FIG. 5, the water-impervious structure 50 of a general waste sea surface treatment plant is laid along the slope of the slope 52 on the revetment 51, and the upper and lower surfaces of the water-impervious sheet are covered with protective mats. It has a sandwich structure.

  On the upper surface of the water-impervious structure 50, a covering layer 53 for preventing the water-impervious structure 50 from being lifted by a tide level or wave force is further laid, and functions as a counterweight. As the covering layer 53, for example, so-called solidified soil obtained by mixing cement slurry with mud generated by dredging work and curing it is used. In the figure, 54 is the seabed ground.

  The waste sea surface treatment plant is desired to have a large landfill capacity with as little area as possible. Accordingly, steep slopes are being considered for the slope 52 of the revetment. If steep slopes can be realized, an increase in landfill capacity can be expected, and at the same time, the amount of covering layer 53 can be saved.

  However, if the slope of the slope 52 is made steep, the load of the coating layer 53 cannot be reliably supported on the slope, and the pressing by the coating layer 53 is unstable, such as displacement of the coating layer 53. become.

Therefore, by using a material in which the above-mentioned solidified soil is stored in a bag-like sheet (hereinafter referred to as a solidified soil-clad mat), the shape retention of the covering layer 53 is improved and the steep slope is endured. A revetment construction method has been proposed (see, for example, Patent Document 1).
JP 2005-68917 A

  However, in the above revetment construction method, the solidified soil itself is stored and retained in the bag-shaped sheet, but this time, slipping occurs between the bag-shaped sheet and the protective mat, and the covering layer 53 is still unstable. There is a problem that. In addition, if the weight of the solidified soil contained in the bag-like sheet is not supported by the slope, the weight of the solidified soil may be directly added to the bag-like sheet and the bag-like sheet may be damaged.

  The present invention has been made in consideration of the problems in the conventional revetment and water-impervious structure as described above, and enables the slope of the slope to be steep while supporting the slope in a stable state. The present invention provides a water-proof structure that can be used, and a protective mat and bag used for the water-proof structure.

  In the first embodiment of the present invention, a water shielding sheet protected by a protective mat is laid along a slope formed on the shore, and a bag body filled with a soil filler is further laid on the upper surface of the protective mat. The water-blocking structure in which the anti-slip treatment is applied to at least the bag body contact surface side of the protective mat or at least the protective mat contact surface side of the bag body.

  According to the water-proof structure of the first embodiment, since either the protective mat or the bag body is subjected to the anti-slip treatment, the protective mat or bag body on the side where the anti-slip treatment is not applied is the existing configuration. Even if it exists, the friction coefficient in the contact surface of a protection mat and a bag body is raised.

  In the second embodiment of the present invention, a water shielding sheet protected by a protective mat is laid along a slope formed on the shore, and a bag body filled with a soil filling is further laid on the upper surface of the protective mat. In the water-blocking structure, the anti-slip treatment is applied to at least the bag body contact surface side of the protective mat and at least the protective mat contact surface side of the bag body.

  According to the second embodiment, since the anti-slip treatment is applied to both the protective mat and the bag body, the contact surface between the protective mat and the bag body is larger than that of the first embodiment. The coefficient of friction can be further increased.

  In the present invention, the shore means a shore that is a target of revetment work in a river, a coast, a landfill, or the like. Further, the protective mats are disposed on both upper and lower sides of the water shielding sheet to prevent the water shielding sheet from being damaged, and one or a plurality of the water shielding sheets protected by the protective mat are included. Furthermore, as a specific example of the soil filling, for example, solidified soil obtained by adding a cement-based solidifying material to mud generated in dredging or the like and mixing them is shown.

  As the protective mat in the first and second embodiments, for example, a nonwoven fabric formed into a mat shape by entanglement of long fibers with a needle punch or press-contacting of long fibers can be used.

  In addition, as the anti-slip treatment in the first and second embodiments, inorganic particles can be applied through a binder.

  Moreover, the bagging body in said 1st and 2nd form can be formed with the woven fabric which consists of synthetic fibers.

  Moreover, in the said 2nd form, it makes it a summary that the friction coefficient of the protection mat | matte which carried out the slip prevention process, and the bag body which carried out the slip prevention process is 0.5 or more.

  The gist of the present invention is a protective mat used for a combination of a protective mat for a water-blocking structure in which either one of the protective mat or the bag body is subjected to an anti-slip treatment and the bag body.

  The gist of the present invention is a bag body used for a combination of a protective mat and a bag body for a water shielding structure in which either one of the protective mat or the bag body is subjected to an anti-slip treatment.

  The gist of the present invention is a protective mat used for a combination of a protective mat and a bag for a water-proof structure in which both the protective mat and the bag are anti-slip treated.

  The gist of the present invention is a bag used for a combination of a protective mat and a bag for a water-proof structure in which both the protective mat and the bag are anti-slip treated.

  According to the present invention, there is an advantage that the slope of the slope can be made steep while the covering layer laid on the protective mat is supported on the slope in a stable state.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 shows an embodiment in which the water shielding structure according to the present invention is applied to a waste sea surface treatment plant.

  In the figure, the water-impervious structure 1 is formed along the slope 3 of the revetment 2 that partitions the open sea and the disposal site, and a coating layer 4 is further provided on the surface of the water-impervious structure 1 with a counterweight. It is laid as. In addition, in the figure, 5 shows the belly soil which forms the slope 3, and 6 has shown the seabed ground, respectively.

  FIG. 2 is an enlarged view of the water shielding structure 1 and its surroundings.

  As shown in the figure, a backfill stone 6 and a solidified soil bag mat 7 are provided as a bellows soil 5, and a protective mat 8 and a water shielding sheet 9 as a water shielding structure are provided on the solidified soil bag mat 7. The protective mat 10 is laminated in this order.

  On the protective mat 10, a covering layer 4 made of a solidified clay bag mat 11 and a presser stone 12 is laid.

  The water shielding sheet 9 is a synthetic resin sheet made of polyvinyl chloride, polyethylene or the like and having a thickness of about 3 mm. In order to protect the water shielding sheet 9, protective mats 8 and 10 are provided on both upper and lower sides. Is arranged.

  The bag body 11a constituting the solidified earth clay mat 11 has an upper sheet 11b and a lower sheet 11c facing each other in a state parallel to the slope 3, and lower ends of the upper sheet 11b and the lower sheet 11c. It is formed in a U-shaped cross section by the joined bottom sheet 11d. The upper portion of the bag 11a is open and serves as an inlet 11e for filling the solidified soil (see FIG. 1).

  The bag 11a having such a configuration has a space formed therein, and this space communicates with the longitudinal direction of the revetment 2 (the depth direction on the paper surface). In addition, holding ropes 11f are connected to the upper sheet 11b and the lower sheet 11c facing each other at a plurality of locations, and the sheets 11b and 11c are held at a predetermined interval when the solidified soil is filled. ing.

  A belt-like hooking belt 11g is attached in a U-shape along the inner surface of the bag body 11a, and an upper end 11h of the hooking belt 11g is hooked to a support pipe (not shown).

  In the revetment structure having the above-described configuration, the characteristic part of the present invention is the configuration of the protective mat 10 in the water-impervious structure 1 and the solidified earthen mat 11 laminated thereon.

(a) Protective mat FIG. 3 shows a cross-sectional structure of the protective mat 10.

  In the figure, a protective mat 10 is made of a nonwoven fabric 10a formed by forming a web made of long fibers and tangling them with a needle punch and then pressing or bonding the long fibers, and the fiber density is It is formed into a mat with an increased thickness of about 5 mm. The protective mat 10 can sufficiently cope with the strength even in a situation where a protrusion is inserted.

  As the material of the long fibers, chemical fibers such as inorganic fibers, regenerated fibers, semi-synthetic fibers, and synthetic fibers can be used, but it is preferable to use continuous filaments of synthetic fibers that are advantageous in terms of productivity. .

  Examples of the synthetic fibers include polyolefin fibers such as polypropylene and polyethylene, polyester fibers such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate, polyamide fibers such as nylon, acrylic fibers such as acrylonitrile, and other, polyvinyl alcohol-based fibers. It can be used alone or in combination of two or more of fiber, polyvinyl chloride fiber, polyvinylidene chloride fiber, modacrylic fiber, fluorocarbon fiber, polyurethane fiber, etc., but it is inexpensive and has high specific gravity. It is preferable to use a polyester fiber in terms of (1 or more).

  The average fineness of the long fibers can be about 1 to 10 dtex (dg / km), more preferably 2 to 6 dtex. If the average fineness is too large, the protective function against protrusions is lowered, which is not preferable. On the other hand, if it is too small, water permeability deteriorates when submerged in the sea, which is not preferable.

  The pressure-bonding means that it is pressed and bonded by a pressure roller such as a smooth calender roll or engraving roll. Basically, it may be bonded only by the pressure of each of the above rolls. In general, an adhesive such as a general-purpose resin binder liquid, a powder adhesive, or a fibrous adhesive can be used.

  Moreover, the formation of the nonwoven fabric is not limited to the needle punch method and the pressure bonding method, but may be a method in which mechanical entanglement is given by a stitch method, a spun lace method or the like and then pressure contact is performed with various rolls.

The basis weight of the nonwoven fabric 10a is preferably about 300 to 1500 g / m ² , more preferably 500 to 800 g / m ² . If the mass per unit area is too small, the penetration resistance of the protrusions is lowered and the purpose of protecting the water shielding layer cannot be achieved. On the other hand, if the amount is too large, the water permeability will be low, and it will not be easy to immerse in the sea.

The density of the nonwoven fabric 10a is preferably 0.03~0.2g / m ^3, more preferably from 0.05~0.15g / m ^3. If the density is too small, it cannot be adhered to the water-impervious sheet, and if it is too large, it cannot be immersed in the sea.

  In addition, as long as the said nonwoven fabric 10a is mainly formed with a long fiber, a middle fiber and a short fiber can also be mixed in the range which does not affect the effect of this invention.

  The nonwoven fabric 10a configured in this manner is generally stronger and less likely to be deformed than a nonwoven fabric sheet made of short fibers, so that it can resist, for example, the penetration of protrusions that damage the water shielding layer. it can.

  On the surface of this non-woven fabric 10a, a large number of inorganic particles 10b are attached as a non-slip treatment via a binder 10c, and a high frictional force is obtained between the protective mat 10 and the solidified earthen mat 11 in contact therewith. It is supposed to be.

  As the inorganic particles, there can be used a sand material obtained by firing sea sand, a recycled material obtained by pulverizing concrete, wall materials, or tiles generated at a building demolition site, for example.

  Further, as the anti-slip treatment, a large number of resin protrusions may be formed on the nonwoven fabric surface by transferring a highly viscous resin with a roll.

  The particle size of the inorganic particles 10b is preferably about 50 to 2000 μm, more preferably 200 to 500 μm. When the particle size is too small, the slip resistance is lowered. On the other hand, if it is too large, the adherence to the nonwoven fabric 10a is reduced, and dropping off occurs.

  Moreover, it is preferable that the binder 10c uses an emulsion form.

  Specifically, acrylic resin binders made of homopolymers of acrylic acid, methacrylic acid, acrylate esters or copolymers with other monomers, polyvinyl acetate, polyvinyl chloride, polyvinyl alcohol (PVA), ethylene- Examples thereof include vinyl resin binders such as vinyl acetate copolymer (EVA), rubber binders such as styrene-butadiene rubber and acrylonitrile-butadiene rubber.

  Among the above binders, it is preferable to use an acrylic resin binder in consideration of durability, production conditions, and cost.

  Moreover, the compounding quantity of the said inorganic particle 10b is mix | blended in the ratio of about 10-300% with respect to the binder 10c, More preferably, 50-100%. When the blending amount is too large, the coating property on the surface of the nonwoven fabric 10a is deteriorated and particles are easily dropped during use. On the other hand, if the blending amount is too small, the water permeability becomes poor and it is difficult to immerse in seawater.

  In the above embodiment, the inorganic particles 10b are applied (attached) only to one side (surface side) of the nonwoven fabric 10a. However, the present invention is not limited to this, and both surfaces of the nonwoven fabric 10a (the surface in contact with the solidified earthen mat 11 and the shielding). You may apply | coat to the back surface side which contacts the water sheet 9.

  When the inorganic particles 10b are applied to both surfaces of the nonwoven fabric 10a, a large frictional force is applied to the solidified earthen mat 11 to prevent slipping, while a large frictional force is also applied to the water shielding sheet 9. Slip is prevented, and the stability of each layer in the water-impervious structure 1 is enhanced.

(b) About the solidified soil bag mat As the woven fabric used for the solidified soil bag mat 11, it is preferable to use processed yarn, for example, Toyobo Co., Ltd.'s civil engineering canvas # 1030 or # 1050 is used. can do.

  Woven fabric # 1030 is plain weave using polyester multifilament 1670dtex / 190fil for warp and weft, and after a series of refining and heat setting process, it is made into a processed fabric with a warp density of 50 / 5cm and a weft density of 50 / 5cm. is there.

  Woven fabric # 1050 is similarly twisted three polyester multifilaments 1670dtex / 190fil at a twist rate of 30T / m, plain weaved using the resulting twisted yarn as warp and weft, and after a series of refining and heat setting processes, warp density A processed woven fabric with 30 yarns / 5 cm and a weft density of 30 yarns / 5 cm.

  Folding the woven fabric woven in a band shape into a U shape, and connecting the woven fabric folded back in the U shape in the band width direction to form a bag body 11a that can store the solidified soil. Can do.

  The surface of the bag body 11 a for storing the solidified soil that has been formed in this way can be subjected to anti-slip treatment in the same manner as the protective mat 10.

  That is, by applying a large number of inorganic particles 10b to the surface of the bag 11a via the binder 10c, a high frictional force with the protective mat 10 can be obtained. The protective mat in this case may be an existing protective mat that has not been subjected to the anti-slip treatment, or may be the protective mat 10 that has been subjected to the anti-slip treatment.

  The woven fabric of the present invention preferably has a configuration in which the friction coefficient with the protective mat 10 described above is high. For example, a twisted yarn, a low weave density, and a woven structure having one or more warp or weft floats ( It is preferable to use a tissue that flies.

  When twisted yarn is used, the number of twists is preferably in the range of 5 to 80 T / m. This is because within such a range, a high frictional force can be obtained between the protective mat 10 without damaging the fibers. The number of twists is more preferably 10 to 70 T / m, still more preferably 20 to 60 T / m.

  The weaving density is preferably 10 / 5cm to 45 / 5cm. This is because within such a range, the coefficient of friction with the protective mat 10 is increased while maintaining the fabric strength. The weaving density is more preferably 15 pieces / 5 cm to 40 pieces / 5 cm, still more preferably 20 pieces to 35 pieces / 5 cm.

  Further, the number of floats is preferably in the range of 1 to 10 as the woven structure. This is because the friction coefficient can be increased within such a range without causing problems such as pilling. The number of floats is more preferably 2-8, and still more preferably 3-7.

  Specific examples of the weave structure include twill, satin, cord weave, stone texture, and Nanako weave.

(C) Test method of anti-slip property Using the test apparatus 20 shown in FIG. 4, the anti-slip property test was performed according to the following procedure.

  In the figure, reference numeral 20a denotes a base formed as a dummy ground, and a sheet piece 11i of the bag 11a is fixed as a test piece to a top plate (made of an iron plate) 20b of the base 20a. .

  On this sheet piece 11i, an iron plate 20c affixed with the nonwoven fabric 10a of the protective mat 10 as a test piece (on the lower surface) is placed, and a weight 20d is placed as a load W on the iron plate 20c. Thereby, the sheet piece 11i and the nonwoven fabric 10a contact in the pressed state.

  The iron plate 20c is connected to a screw jack 20g via a wire 20e and a load cell 20f. Therefore, if the tensile force w when the iron plate 20c starts to move in the arrow B direction is measured, the friction coefficient can be obtained by calculating w / W.

(D) Test piece
(1) high friction nonwoven: those subjected to non-slip processing ^* on the surface of the long-fiber nonwoven fabric of 850 g / m ^2.
(2) High-friction woven fabric type 1: A frictional property improved by incorporating a high-friction yarn into the constituent yarn itself of a woven fabric of 300 kgf / 3 cm or more.
(3) High-friction woven fabric type 2: An anti-slip treatment ^* applied to the surface of a woven fabric of 300 kgf / 3 cm or more.
(4) High-friction woven fabric type 3: An anti-slip treatment ^* applied to the surface of a woven fabric of 500 kgf / 3 cm or more.
(5) General nonwoven fabric
(6) General woven fabric * Acrylic resin and sand particles are attached to the surface of the object and the surface is processed into sandpaper.

  The material having improved friction characteristics by incorporating a high friction yarn into the constituent yarn itself of the woven fabric is specifically a product obtained by incorporating 20% Taslan (registered trademark) processed yarn.

  The non-woven fabric corresponds to the protective mat 10, and the woven fabric corresponds to the solidified earthen mat 11.

  No. of the above test result. As can be seen from FIG. 6, the friction coefficient in the combination of the non-slip treated nonwoven fabric and the general woven fabric is 0.39, and the non-slip treated nonwoven fabric and the non-slip treated woven fabric. It was confirmed that the anti-slip performance was improved as compared with the friction coefficient of 0.27 to 0.30 in combination with the cloth.

  In addition, the test result No. As shown in 7-9, the friction coefficient in the combination of the woven fabric subjected to the anti-slip treatment and the general non-woven fabric is 0.38 to 0.57, and the non-slip-proof nonwoven fabric and the anti-slip which are not subjected to the conventional anti-slip treatment It was confirmed that the anti-slip performance was improved as compared with a friction coefficient of 0.27 to 0.30 in combination with a woven fabric that had not been treated.

  As described above, if any one of the nonwoven fabric of the protective mat 10 and the woven fabric of the solidified earthen mat 11 is subjected to the anti-slip treatment, the anti-slip performance can be enhanced.

  Furthermore, the test result No. As shown in 1 to 5, it was confirmed that when both the nonwoven fabric and the woven fabric were subjected to the anti-slip treatment on the contact surface side, the friction coefficient was significantly improved to 0.52 to 0.65. It was.

  Therefore, according to the water-impervious structure of the present invention, when building a revetment, it is possible to provide a degree of freedom in the design slope of the slope, and the water-impervious structure of the present invention is applied to a waste sea surface treatment plant. If the slope is steep, the landfill capacity can be increased.

It is sectional drawing of the revetment to which the water-impervious structure concerning this invention is applied. It is the A section enlarged view of FIG. It is an expanded sectional view of the protection mat shown in FIG. It is explanatory drawing which shows the test apparatus for measuring the friction coefficient of this invention. It is sectional drawing of the revetment provided with the conventional water-impervious structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water-impervious structure 2 Revetment 3 Slope 4 Covering layer 5 Lined soil 6 Submarine ground 7 Solidification soil bag mat 8 Protection mat 9 Water shielding sheet 10 Protection mat 10a Nonwoven fabric 10b Inorganic particle 10c Binder 11 Solidification soil bag mat 11a Body 11b Upper sheet 11c Lower sheet 11d Bottom sheet 11e Inlet 11f Holding rope 11g Hanging belt 11h Upper end 11i Sheet piece

Claims (10)

In a water shielding structure in which a water shielding sheet protected by a protective mat is laid along the slope formed on the shore, and a bag body filled with a soil filler is further laid on the upper surface of the protective mat,
A water-proof structure, wherein an anti-slip treatment is applied to at least the bag body contact surface side of the protective mat, or at least the protective mat contact surface side of the bag body. In a water shielding structure in which a water shielding sheet protected by a protective mat is laid along the slope formed on the shore, and a bag body filled with a soil filler is further laid on the upper surface of the protective mat,
An anti-slip treatment is performed on at least the bag body contact surface side of the protective mat and at least the protective mat contact surface side of the bag body.   The water-blocking structure according to claim 1 or 2, wherein the protective mat has a non-woven fabric formed into a mat shape by entanglement or pressure contact with long fibers.   The water-blocking structure according to any one of claims 1 to 3, wherein inorganic particles are applied via a binder as the anti-slip treatment.   The water shielding structure according to any one of claims 1 to 4, wherein the bag is formed of a woven fabric made of a synthetic resin.   The water-blocking structure according to any one of claims 2 to 5, wherein a friction coefficient between the protective mat subjected to the anti-slip treatment and the bag body subjected to the anti-slip treatment is 0.5 or more.   A protective mat used in a combination of the protective mat and the bag in the water-impervious structure according to claim 1.   The bag body used for the combination of the said protective mat and the said bag body in the water-impervious structure of Claim 1.   A protective mat used in a combination of the protective mat and the bag in the water-impervious structure according to claim 2.   A bag body, which is used for a combination of the protective mat and the bag body in the water shielding structure according to claim 2.

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