JPH10152819A - Made land of artificial sandy beach or dry beach - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of the environment of a constructing water area by continuing a box-like structure in contact with a revetment front surface in parallel to the revetment, and filling sand in the box-like structure. SOLUTION: A shallow box-like structure 5 is continuously constructed on the sea-side vertical surface 1a of a revetment 1 in parallel in contact with it, and a filling material such as sand 3 is filled in the inner part. For example, the structure 5 is arranged in a repeatedly up-and-down staircase form as the whole. The structure 5 is protruded from a revetment 1 with the bottom plate part being separated from water bottom to save the using quantity of concrete and the sand 3. Further, the protruded structure 5 is supported by a strut raised from the water bottom to ensure the strength. Since the range protruded to the sea side is reduced, thus, an artificial sandy beach or dry beach can be constructed without significantly reducing the water area or channel, and the using quantity of sand can be reduced. Further, adhered living matters and fishes corresponding to the vertical wall can live, and either one of the structures can be present on the water level even when the sea level is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial sandy beach, a tidal flat and the like formed in front of a new or existing revetment such as a sea, a lake or a river.

[0002]

2. Description of the Related Art Seawalls, lakes, marshes, rivers and other seawalls are often concrete wall-shaped, but in order to impart hydrophilicity to these seawalls and to improve the biological environment, sandy beaches are provided in front of the seawalls. And tidal flats may be created artificially.

Conventionally, such artificial sandy beaches and tidal flats are constructed as artificial sandy beaches 2 by burying sand 3 with the front surface of the revetment 1 facing, for example, the sea 4 as shown in FIG. To maintain the condition as sandy beach 2 or tidal flat,
Landfill with a very gentle gradient of 50/1 or less.

[0004]

The conventional method shown in FIG. 8 reclaims a long area from the front of the revetment to the offshore or opposite shore. If the water area is narrow, such reclamation is used. And the use of waterways may not be possible. In addition, a large amount of sand is required for landfill, which increases the cost, and the landfill operation requires labor.

[0005] Further, when the sea or river side of the revetment is composed of vertical walls, the vertical walls do not come into contact with water due to reclamation, and therefore, the inhabitants that have inhabited the upright walls. Creatures and fish may disappear.

SUMMARY OF THE INVENTION An object of the present invention is to solve the disadvantages of the prior art described above, and when an artificial sandy beach or tidal flat is to be artificially created in front of a revetment, even if an artificial sandy beach or tidal flat is created, the water area in contact with the revetment is significantly large. It does not become too narrow, does not hinder the use of water areas and waterways, and requires a small amount of sand required for land reclamation, and adheres to the vertical walls of the revetment. It is an object of the present invention to provide artificial sandy beaches, tidal flats, and the like that do not affect the habitat and do not impair the ecology.

[0007]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention relates to a construction site such as an artificial sandy beach or tidal flat formed on the front of a revetment. The main point is to fill the filling material such as sand into the inside of the square structure, and to form the square structure continuously in a stepwise manner. is there.

[0008] Further, the gauze-shaped structure has a gist that the bottom plate is protruded from the water bottom so as to protrude from the seawall, and the bottom plate is supported by a column.

According to the first aspect of the present invention, an artificial sandy beach, tidal flat, or the like is formed by providing a square-shaped structure in contact with the front surface of the revetment and in parallel with the front surface of the revetment. There is no need to reclaim a long area toward the sea, and the water area and waterways are not narrowed and cannot be used.

[0010] In addition, since sand or the like is filled in the inside of the masu-shaped structure, the amount of sand used can be small.

[0011] Furthermore, by constructing with a masu-shaped structure, a vertical wall similar to the revetment can be provided in front of the revetment. It does not disturb the habitat.

According to the second aspect of the present invention, in addition to the above-described functions, since the cascade-shaped structure is formed continuously in a step-like manner, artificial sand beaches, tidal flats and the like having various depths can be formed. It can respond to various conditions such as changes in tide level.

According to the third aspect of the present invention, in addition to the above-mentioned functions, the slab-shaped structure is provided so as to protrude from the seawall with the bottom plate separated from the water bottom. The thickness of the concrete can be reduced, the amount of concrete used for the concrete-shaped cascade-like structure can be reduced, and the economic efficiency can be improved.

According to the fourth aspect of the present invention, in addition to the above function, the load on the structural body is supported by supporting the bottom plate of the square-shaped structural body projecting from the revetment with the support pillar. The strength can be secured.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of an artificial sand beach, a tidal flat, or the like according to the present invention, and FIG. 2 is a vertical sectional side view of the same. Then, a basin-like structure 5 having a shallow bottom is continuously formed in parallel with and in contact with the vertical surface 1a on the front side of the sea 4 side of the revetment 1.

The structure 5 is made of concrete as an example, and is formed at an appropriate depth position with respect to the revetment 1. In the embodiment shown in FIG. Each of the structures 5 is filled with a filling material such as sand 3.

The step of each structure 5 is, for example, 30 to 50 cm.
As a measure, a fall prevention means such as a handrail 6 is provided on the sea 4 side of the structure 5.

As described above, artificial sandy beaches and tidal flats are created by the cascading structure 5 in which the sand 3 is filled. Since such a structure 5 is constructed along the front surface of the revetment 1 and in a belt shape in parallel with the revetment 1, the range protruding toward the sea 4 is narrow, and the water area and the waterway are not greatly reduced. A small amount of sand 3 is sufficient. And since a vertical wall is formed by the wall surface in front of the structure 5, even if an artificial sandy beach or tidal flat is further constructed on the sea 4 side of the revetment 1, attached organisms and fish here correspond to the upright wall. Can inhabit.

The structure 5 is provided in a step shape,
Even if the water surface rises or falls due to a change in tide level, any one of the structures 5 will be present at the position of the water surface, and it can cope with various depths.

Depending on the purpose of use and the conditions, the depth position where the structure 5 is formed is fixed as in the second and third embodiments of FIGS. The structure 5 can also be constructed. FIG. 3 shows a structure 5 constructed at a height at which water does not cover even at this tide level, for example, based on a high tide level at high tide. FIG. 4 shows a structure 5 at this height according to the level at low tide. Is constructed.

Further, when the height position of the upper surface of the structure 5 is set to a relatively high position as the fourth embodiment, as shown in FIG. If the portion is thinned, the amount of concrete used for forming the structure 5 can be reduced, which is economical. In this case, the amount of the sand 3 used is large, but the cost is lower than that of concrete, so that the economic efficiency can be secured.

Similarly, in the fifth and sixth embodiments, as shown in FIGS. 6 and 7, if the structure 5 is formed so that the bottom plate is separated from the water bottom and the structure 5 projects from the seawall 1, the use of concrete is possible. Not only the amount but also the amount of sand 3 used can be reduced.

It should be noted that the vertical load of the structure 5
In the case of the embodiment, the thickness is increased by increasing the thickness of the base of the bottom plate, and in the case of the sixth embodiment, the strut 7 is erected from the water bottom to support the lower part of the structure 5 to thereby increase the strength. Secure.

[0024]

As described above, the artificial shores and tidal flats constructed according to the present invention can be used even when artificial sandy shores and tidal flats are to be artificially formed in front of the revetment. The water area in contact with the revetment is not significantly narrowed, there is no hindrance to the use of water areas and waterways, and the amount of sand required for construction is small, and it inhabits the vertical wall of the revetment. There is no risk of affecting the inhabitants of attached creatures and fish, and does not impair the ecology.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of an artificial sandy beach, a tidal flat or the like according to the present invention.

FIG. 2 is a longitudinal sectional side view showing a first embodiment of a land for development such as an artificial beach or tidal flat according to the present invention.

FIG. 3 is a vertical sectional side view showing a second embodiment of the land for development such as an artificial beach or tidal flat of the present invention.

FIG. 4 is a vertical sectional side view showing a third embodiment of the land for development such as an artificial beach or tidal flat of the present invention.

FIG. 5 is a vertical sectional side view showing a fourth embodiment of a land for development such as an artificial beach or tidal flat of the present invention.

FIG. 6 is a vertical sectional side view showing a fifth embodiment of the artificial land, such as an artificial beach or tidal flat, of the present invention.

FIG. 7 is a longitudinal sectional side view showing a sixth embodiment of the land for development such as an artificial beach or tidal flat of the present invention.

FIG. 8 is a longitudinal sectional side view showing a conventional artificial lands such as artificial beaches and tidal flats.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Seawall 1 ... Vertical wall 2 ... Sandy beach 3 ... Sand 4 ... Sea 5 ... Structure 6 ... Handrail 7 ... Prop

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Hirashima Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo

Claims (4)

[Claims] 1. A construction site such as an artificial sandy beach or a tidal flat formed on the front of a seawall, a square-shaped structure being in contact with the front of the seawall and being connected to the front of the seawall in parallel, and formed at an appropriate depth position. A sandy or tidal flat created by filling a filling material such as sand into the structure of the above. 2. The land according to claim 1, wherein the cascade-shaped structure is continuous in a step-like manner. 3. The land according to claim 1, wherein the basin-shaped structure is provided so as to protrude so that the bottom plate is separated from the water bottom and protrudes from the seawall. 4. The land according to claim 3, wherein the masu-shaped structure supports the bottom plate with a support.