JP3605666B2 - Seawall formation of seawall - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a water barrier layer forming body for seawalls, and more particularly to a water barrier layer forming body for a managed seawall such as an industrial waste final disposal site in a coastal area.
[0002]
[Prior art]
Conventionally, for control-type seawalls such as industrial waste final disposal sites, to prevent the outflow of harmful substances contained in industrial waste, seepage control sheets or steel sheet piles or a combination of these methods are used. Is used.
[0003]
[Problems to be solved by the invention]
However, for example, in the case of a gravity type revetment constructed in a deep water area with a water depth of 20 m or more, there is a problem that it is difficult for a diver to lay a water barrier sheet and the steel sheet pile structure becomes very large.
[0004]
An object of the present invention is to provide a watertight impermeable layer forming body of a revetment by completely mechanized construction, which is capable of solving the above-mentioned problem, and which is safe, reliable, and easy to construct.
[0005]
[Means for Solving the Problems]
The seawater barrier layer forming body of the seawall according to the present invention is stacked at a predetermined position on the seawall in the sea , and has a large number of water-permeable bags filled with a viscous soil and a solidifying material. And a degradable sheet containing the superabsorbent polymer .
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
In the present invention, as shown in FIG. 1, a viscous soil 2 such as a dredged soil carried by an earth transporting vessel 1 is grasped by a backhoe 3, and sized by a vibrating screen 5 on a barge 4, and the water content is determined. It is put in the adjusting tank 6 and injected with a water pump 7 to produce muddy viscous soil. The viscous soil and the solidified material are mixed in a mixer plant 8 and filled into a water-permeable bag 10 by a filling device 9. .
[0009]
The bag body 10 is placed on a dropping device 11 and lifted by a crane 12, and the position of the prism 13 attached to the top of the crane 12 is measured from a known point on land to guide the bag body 10 to a predetermined position. In this case, the position in the sea is measured by the ultrasonic receiver 14 attached to the barge 4 and the ultrasonic transmitter 15 attached to the dropping device 11, and guided to a predetermined position, and Is dropped on the slope of the basic rubble 17.
[0010]
Hereinafter, the form management is performed by measuring the unevenness of the impermeable layer 18 formed by repeating the above operation by the seabed deep-season sonar 19 attached to the barge 4.
[0011]
FIG. 2 is an explanatory view of the impermeable layer 18 on the slope of the foundation rubble 17 at the revetment formed by the present invention, where 21 is landfill soil (industrial waste), 22 is cover soil, and 23 is a caisson.
[0012]
FIG. 3 is an explanatory view of the impermeable layer 18 on the slope of the basic rubble 17 and the backing stone 20, and FIG. 4 is an enlarged front view of the impermeable layer 18.
[0013]
As shown in FIGS. 5 to 8, the bag 10 for forming a water-impervious layer according to the present invention has a flat bag 24 made of a woven or non-woven fabric made of a water-permeable chemical fiber. A degradable sheet 25 whose inner peripheral portion is attached to the outer peripheral portion of any surface and whose outer peripheral portion protrudes from the outer periphery from the bag 24 is formed. The degradable sheet 25 is shown in FIG. As described above, the superabsorbent polymer 26 is included to form a sheet. In addition, 27 is a thread that joins the upper and lower degradable sheets 25.
[0014]
In the present invention, first, the solidified component that oozes out of the fluid viscous soil injected into the water-permeable bag enters the inside of the cloth constituting the bag, and the gap between the stacked bag bodies, and forms an impermeable layer. Form. Next, the degradable sheet attached around the bag body deteriorates in seawater in about one month. Due to this deterioration, the superabsorbent polymer inside and the seawater come into contact, and the polymer absorbs the seawater. It absorbs and swells, completely fills the gap between the bags, and completely blocks the gap that is the path of harmful substances. As described above, the present invention forms an extremely reliable water-impervious layer in two stages of the solidified component leached from the bag and the superabsorbent polymer.
[0015]
The bag 24 of the bag 10 can be deformed by filling the fluidized viscous soil and the solidified material with an amount smaller than the limit filling capacity of the bag 24, and the bags 10 laid in a plurality of stages can be mutually deformed. As well as the gaps become smaller, the gaps are filled with the solidified components that have leached out of the bag and the superabsorbent polymer that has absorbed seawater as described above, so that a water-blocking layer is reliably formed and industrial waste It is possible to completely prevent the outflow of harmful substances contained in goods.
[0016]
In addition, since the bag 24 is filled with a mixture of the viscous soil in a fluidized state and the solidifying material, the bag hardens after being laid and does not collapse by its own weight. Is effective as a measure to reduce earth pressure.
[0017]
【The invention's effect】
As described above, according to the water barrier layer forming body of the revetment of the present invention, there is no need to lay a water barrier sheet, and thus the water barrier layer can be formed safely and securely without performing diver work.
[0018]
Further, according to the water barrier layer forming body of the seawall of the present invention, it is possible to completely shield the gap between the bags.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a seawall impermeable layer forming body of the present invention.
FIG. 2 is an explanatory view of a water barrier layer on a slope of a base rubble of a revetment formed according to the present invention.
FIG. 3 is an explanatory view of a water barrier layer formed on the back surface of a seawall upper structure formed according to the present invention.
FIG. 4 is an enlarged front view of the impermeable layer.
FIG. 5 is a front view of a water impermeable layer forming body of the present invention.
6 is a perspective view of the bag shown in FIG.
FIG. 7 is an explanatory diagram of a degradable sheet used for the bag of the present invention.
FIG. 8 is an explanatory view of a stacked state of the bags of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 soil carrier 2 clay soil 3 backhoe 4 barge 5 vibrating screen 6 water content adjustment tank 7 water pump 8 mixer plant 9 filling device 10 bag body 11 dropping device 12 crane 13 prism 14 ultrasonic receiver 15 ultrasonic transmitter 16 Submarine ground 17 Basic rubble 18 Water-blocking layer 19 Seabed deep survey sonar 20 Backing stone 21 Landfill soil (industrial waste)
22 soil covering 23 caisson 24 bag 25 degradable sheet 26 super absorbent resin 27 yarn

Claims (1)

A large number of water-permeable bags filled with cohesive soil and solidified material piled up at a predetermined location on the seawall, and a degradable sheet containing a superabsorbent polymer attached to each bag so as to protrude from the outer periphery. A water barrier formation of a seawall, characterized by comprising:

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