JP2008156964A - Revetment with preparation base such as dry beach - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a revetment with a preparation base such as a dry beach, capable of forming an environment adaptive even to organisms using the preparation base such as the dry beach as a habitable space, by holding a stable state with excellent workability, when extending the preparation base such as the dry beach, a tidal basin, an inlet and a shallow place in a revetment body. <P>SOLUTION: This preparation base such as the dry beach 8 is constructed by filling a solidification material 7 or the solidification material 7 and an infilling material 6 such as fluidization treated earth being a base 5 of the dry beach 8 in a cavity part 4, by forming the cavity part 4 by a frame body 2 on a front face or the inside of the revetment body 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a revetment in which a built-up platform such as a tidal flat, a tide pool, a cove, and a shallow place is added to an existing or newly built revetment.

  In recent years, urban regeneration has been advocated, and watersides such as artificial tidal flats and artificial beaches have been created. In addition, the regeneration of waterways and canals within the city is also being sought. And in the restoration of waterways and canals in the inner bay and estuary, it is also required to add a new function of symbiosis by combining renewal construction with the earthquake resistance of existing revetments and sea level rise. .

Examples of revetments that meet such requirements include a small tidal flat, a tide pool, and a shallow area installed in front of an existing revetment main body (see, for example, Patent Documents 1 and 2).
Japanese Patent No. 3031672 Japanese Patent No. 3096720

  When constructing such a revetment, the problem is how to construct the foundations of the added tidal flats, tidal pools, inlets, shallows, etc., but the added part of the foundation is installed in front of the existing revetment main body. Or the revetment main body will be cut out and installed inside it.

  Conventionally, for example, when the water depth is shallow as shown in FIG. 9, a pile 20 is placed in front of the existing revetment main body 1, and a frame body 2 having an L-shaped cross section is formed on the pile 20. It is made of concrete, and this frame 2 is projected horizontally from the front surface of the revetment main body 1 toward the sea 3. And between the bottom part of the frame 2 and the seabed, earth and sand 21 are filled.

  Alternatively, as shown in FIG. 10, the caisson 22 prepared in advance is sunk on the front surface of the revetment main body 1.

  When the water depth is deep, as shown in FIG. 11, the front side of the revetment main body 1 is solidified 23 by masonry from the sea bottom, a flat portion is formed on the top of the root solidified 23, and a waterproof sheet 24 is laid here. An impermeable layer is formed.

  In the method shown in FIG. 9 to FIG. 11, sand is prevented from flowing out in tidal flats, accumulated water is prevented from flowing out in tidal pools, and the base is stabilized in shallow areas. If the sheet 24 is deteriorated or damaged, the stable state at the beginning of the plan cannot be maintained.

  Further, in order to maintain the stable state, skill and attention are required. Further, since the construction is underwater or on the water, time is required and the construction cost increases.

  The purpose of the present invention is to eliminate the inconveniences of the conventional example, and when adding a tidal flat, a tide pool, a cove, a shallow place, etc. to the revetment main body, it has good workability and can maintain a stable state and inhabit the creation stand. The purpose is to provide a revetment with a built-up platform such as a tidal flat that can create an environment that can be adapted to living organisms.

  In order to achieve the above object, the present invention is characterized in that a hollow portion is formed by a frame body on the front or inside of a revetment main body, and a solidified material that becomes a base such as a tidal flat in the hollow portion, or a solidified material The main point is to construct a tidal flat or other basin by filling it with a filling material.

  According to the first aspect of the present invention, by constructing a base such as a tidal flat with a solidified material, an impervious and durable building table can be constructed. In addition, it can be constructed with materials that are suitable for organisms that use this base as a habitat. And, by combining the filling material such as stone with solidified material, the solidified material wraps the whole filling material, and it can contain harmful substances from the filling material, and it flows into the water. In addition, the construction can be easily carried out in water by injecting and launching from the bottom layer of the building table.

  The gist of the invention described in claim 2 is to form a water inlet / outlet at the top end of the frame.

  According to the second aspect of the present invention, seawater in which the water temperature has increased and the dissolved oxygen concentration has increased due to the tide pool or shallow ground of the formation table at the time of tide is replaced with the seawater flowing into the frame from the water inlet / outlet at high tide. , It flows out of the frame from the water entrance. Since seawater is prevented from flowing over the top of the frame at a stretch and being exchanged, the seawater near the revetment main body is maintained in a good water temperature and dissolved oxygen concentration, contributing to water quality improvement and environmental regeneration. it can.

  The gist of the invention described in claim 3 is that the solidifying material is a cement-based caking fluid.

  According to the third aspect of the present invention, the cemented caking fluid is used as the solidifying material, so that the fluidity is higher than that of normal concrete and mortar, and the water becomes impermeable after solidification. It can form layers and is suitable as a material for creating tidal flats.

  The invention according to claim 4 is to use a low pH cement for the cement-based caking fluid.

  According to the present invention described in claim 4, cement-based caking fluid generally uses cement or mortar as a binder, but these are highly alkaline and may adversely affect organisms. Therefore, by using a low pH cement for the cement as the binder, it is possible to make the cement-based caking fluid low alkalinity and obtain a material suitable for living organisms while obtaining the same strength as before.

  The gist of the invention described in claim 5 is that the cement-based caking fluid is fluidized soil, and plant fibers are added to the fluidized soil.

  According to the present invention of claim 5, fluidized soil obtained by mixing mortar with construction residual soil is used as a main material of a base such as a tidal flat, and by adding plant fibers to this, it becomes impermeable when naturalized. Water retention can be ensured for fluidized soil that does not normally retain water. Therefore, even when dried by tides, the base is moistened and can maintain a high moisture content, creating a state similar to natural tidal flats.

  The gist of the invention described in claim 6 is that the proportion of fine aggregate in the solidified material is increased in the surface layer portion of the building table.

  According to the sixth aspect of the present invention, the surface layer portion of the building table is made to contain a large amount of fine aggregates such as soil and sand, thereby making it easy to perform processing such as increasing the unevenness of the finished surface. Can be constructed in any shape according to the situation.

  As described above, the revetment with a tidal flat such as the tidal flat of the present invention is to seal the base of the tidal flat, etc., and the packing material when adding a tidal flat, tide pool, inlet, shallow place, etc. Since it is formed with fluidized soil, etc., it can be constructed with good workability, impervious to water and durable, is maintained in a stable state, and is suitable for living organisms whose habitat is the creation platform. Can be formed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view of a state before the addition of a tidal flat and the like, showing an embodiment of a revetment with a creation stand such as a tidal flat of the present invention, and FIG. 2 shows a first embodiment of the revetment with a creation stand such as a tidal flat of the present invention. In the drawing, 1 in the figure indicates the existing revetment main body, 3 indicates the sea as the water area.

  The first embodiment of FIG. 2 is a revetment with a creation base of a tidal flat 8, and a plane U-shaped frame 2 is installed on the front side of the existing revetment main body 1 on the sea 3 side. The frame body 2 is formed into a bowl-shaped frame from solid materials such as concrete, stone, steel plate, sandbag, and a hollow portion 4 is formed inside. The frame 2 in the illustrated example is formed in a bowl shape, but is not limited to this, and may be formed in a wall shape as shown in FIGS.

  The height of the frame 2 is set to be higher than the low water level (LWL) at low tide and lower than the high water level (HWL) at high tide as shown in FIG. And the notch 2a by the recessed part used as the entrance / exit of seawater is formed in the top end of the frame 2 at the sea 3 side. Moreover, although illustration is abbreviate | omitted, the water gate in the notch 2a can be provided, and the inflow / outflow amount of the water in the frame 2 can also be adjusted. Furthermore, as a water entrance / exit, it is good also as an aspect which forms the communicating paths 2b, such as a pipe body which penetrates the frame 2. FIG.

  In the present invention, when the water depth is deep, as shown in FIG. 6, as the base 5 of the tidal flat 8 in the hollow portion 4, the filling material 6 and the solidified material 7 which is combined with this and becomes the main material of the base 5 Fill.

  The solidified material 7 is a cement-based solidified fluid called manmade soil (trade name), which is a fluidized soil that is a material in which mortar is mixed with construction residual soil. Compared to ordinary concrete and mortar. It has high fluidity and becomes impermeable after solidification and has a property of forming an impermeable layer.

  The filling material 6 is added to stabilize the base 5 when the water depth is deep. By adding this, the amount of fluidized soil can be reduced and solidification can be promoted.

  And as the filling material 6, in addition to stone, it is possible to use a strong waste such as concrete glass, brick glass, and stone pavement.

  If the filling material 6 and the solidified material 7 that is fluidized soil as described above are put into the cavity 4 in the frame body 2, the solidified material 7 having high fluidity totally wraps the filled material 6. Solidify in this way.

  Therefore, toxic substances such as heavy metals generated from the filling material 6 can be contained to prevent outflow, and the construction can be performed underwater by injecting it from the bottom layer of the building table and launching it, which solidifies. Thus, the base 5 of the tidal flat 8 can be constructed.

  As described above, when the solidified material 7 made of fluidized soil is solidified, it becomes impermeable and forms an impermeable layer. However, in natural tidal flats, tide pools, and shallow waters, the base 5 is sand mud and mudstone with high water retention, and even when it is dried due to a drop in water level, the sand mud or mudstone is moist and always has moisture. Yes.

  Therefore, for the solidified material 7 that cannot create a water retention state in a natural state, plant fibers such as cotton and hemp, for example, short fibers having a length of 3 cm or less are added to the fluidized soil. Thereby, water retention (water content ratio) of 10% weight ratio or more can be secured, and the tidal flat 8 can be maintained in the water retention state even when the sea level is lowered due to tide or the like.

  In addition, the fluidized soil is made of cement or mortar as a binder, so that it is highly alkaline and may adversely affect living organisms. Therefore, a low pH cement is used as the cement as the binder.

  As a result, while securing the same solidification as when using cement or mortar as a binder as in the past, adding plant fibers further increases soil strength and increases bending strength. It can be set as the material suitable for the organism which inhabits the upper part by overlaying 5 upper part.

As the low pH cement, a low pH cement mainly composed of MgO and P ₂ O ₅ can be used, and as such a low pH cement, for example, light-burned magnesia described in JP-A-2001-200252 is a main component. And a soil hardener composition.

  The material of the surface layer portion of the base 5 contains a large amount of fine aggregate soil and sand so that the finished surface can be processed easily, and the unevenness of the finished surface can be increased by mixing large particles of sand. Moreover, it is preferable to add a pigment to make white gray into black gray (lightness of 50 or less).

  By increasing the amount of fine aggregate, the strength is decreased and the solidification is delayed, so that processing and shaping with a scoop or the like is possible, and the tide pool 9 having the designed shape can be created. In particular, in the case of the tide pool 9 and the like, any depth, width, and shape of Miyo, etc. In the case of the tidal flat 8 where sand mud is laid, the sand mud can be processed into a shape that is difficult to move, and stones may be laid. You can stabilize the stone by pushing it in.

  The above is a case where the water depth is deep, but in the case where the water depth is shallow, as shown in FIG. 7, for example, only fluidized soil is introduced into the hollow portion 4 as the solidifying material 7 without using the filling material 6, and the surface layer of the base 5 The portion is dug before the solidified material 7 is solidified to form a tide pool 9 or the like.

  In the revetment thus created, seawater that has flowed into the frame body 2 at high tide remains in the tide pool 9 at low tide and functions as a tidal flat 8. And since the plant fiber is added to the base | substrate 5, it will become wet and will be in a water retention state, and can form the environment suitable for a living thing.

  FIG. 3 shows a second embodiment, in which the tidal flat 8 is formed in a stepped shape, and the height of the lowermost frame 2 is set lower than the level of seawater at the time of tide, so that it is always in the sea. A shallow place 10 was provided. The other frames 2 were stepped with different heights.

  FIG. 4 shows a third embodiment. The revetment main body 1 is cut into a plane U shape from the sea side to form a cavity 4 in the revetment main body 1, and a tidal flat 8 similar to that of the first embodiment is formed in the cavity 4. Create.

  FIG. 5 shows a fourth embodiment, which is a combination of the first embodiment and the third embodiment, in which the inside of the revetment main body 1 is cut to form a hollow portion 4, and this inside A frame 2 is provided on the front side of the seawall 3 side of the revetment main body 1 so as to be continuous with the hollow portion 4 and the hollow portion 4 is also formed here, and a large tidal flat 8, a tide pool 9 and a cove are formed as a whole.

  As described above, the revetment of the present invention includes the filling material 6, the base 5 portion made of the solidified material 7 made of fluidized soil that encloses the filling material 6, and the content of the fine aggregate added thereto, the plant fiber. Additives, those that make the binding material low alkali and that form a surface layer portion of the base 5 that is particularly easy to process and has high biocompatibility, and frames 2 such as concrete, masonry, and steel sheet piles that surround this It can be implemented in inner bays, estuaries, river areas, etc. that create tidal flats, tidal pools, bays, and shallow areas.

  FIG. 8 shows an application example, in which a tidal flat 8 is formed on the front side of the seawall 3 side of the revetment main body 1 in the same manner as in the first embodiment. Crab revetment 11 was created. The crab revetment 11 can be exemplified by the symbiotic revetment of Japanese Patent No. 2922193. The concrete frame 2 installed on the front side of the revetment main body 1 on the sea 3 side is combined with the pile 12 as shown in the illustrated example.

It is explanatory drawing of the revetment main body in which the revetment with creation platforms, such as a tidal flat of this invention, is implemented. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows 1st Embodiment of a revetment with creation bases, such as a tidal flat of this invention. It is explanatory drawing which shows 2nd Embodiment of a revetment with creation bases, such as a tidal flat of this invention. It is explanatory drawing which shows 3rd Embodiment of the revetment with creation bases, such as a tidal flat of this invention. It is explanatory drawing which shows 4th Embodiment of the revetment with creation bases, such as a tidal flat of this invention. It is a vertical side view in case the water depth which shows embodiment of a revetment with a creation stand, such as a tidal flat of this invention, is deep. It is a vertical side view in case the water depth is shallow which shows embodiment of a revetment with a creation stand, such as a tidal flat of the present invention. It is a vertical side view of the application example which shows embodiment of a revetment with a creation stand, such as a tidal flat of this invention. It is a vertical side view which shows the 1st example of the conventional revetment with a creation stand, such as a tidal flat. It is a side view which shows the 2nd example of the bank protection with a creation stand, such as the conventional tidal flat. It is a vertical side view which shows the 3rd example of the revetment with a creation stand, such as the conventional tidal flat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Revetment main body 2 Frame 2a Notch 2b Communication path 3 Sea 4 Cavity 5 Base 6 Filling material 7 Solidification material 8 Tidal flat 9 Tidal pool 10 Shallow ground 11 Crab revetment 12 Pile 20 Pile 21 Sediment 22 Caisson 23 Rooting 24 Waterproof sheet

Claims (6)

  A hollow part is formed in the front or inside of the revetment main body by a frame, and a solidified base material such as a tidal flat, or a solidified material and a filling material is filled in this hollow part to construct a tidal flat or other construction platform. Revetment with built-up stand such as tidal flats.   The revetment with a tidal flat and other built-up stands according to claim 1, wherein a water entrance is formed at the top of the frame.   The revetment with a built-up stand such as a tidal flat according to claim 1 or 2, wherein the solidifying material is a cement-based caustic fluid.   The revetment with a built-up stand such as a tidal flat according to claim 3, wherein low pH cement is used for the cement-based caking fluid.   The revetment with a built-up stand such as a tidal flat according to claim 3 or 4, wherein the cement-based caking fluid is a fluidized soil, and plant fibers are added to the fluidized soil. The revetment with a built-up stand such as a tidal flat according to any one of claims 1 to 5, wherein a ratio of the fine aggregate in the solidified material is increased in a surface layer portion of the built-up stand.

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