JP3639864B2 - Beach stabilization structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stabilization structure for a beach which is implemented to prevent sand erosion caused by waves on the beach near the shoreline of the beach and to promote sand accumulation.
[0002]
[Prior art]
Various techniques have been researched and developed to stabilize the sandy beach near the shoreline of the beach.
For example, Japanese Patent Application Laid-Open No. 64-80612 discloses an artificial beach in which a magnet is laid on a lower layer of a sand beach and sand-like coarse particles containing a magnetic material are laminated thereon.
[0003]
Japanese Utility Model Laid-Open No. 2-6725 discloses an artificial sand beach in which a drainage structure is formed in a lower layer of the sand beach, an artificial turf is laid thereon, and sand is laminated on the artificial turf.
Further, JP-A-6-200508 discloses a method for stabilizing a sandy beach in which a drainage layer made of a porous material is installed in the lower layer of the sandy beach, and sand is laminated on the drainage layer.
[0004]
In the specification and drawings of Japanese Patent Application No. 6-18826 filed earlier, a large number of drain structures, in which stone materials are packed in a steel frame as an example and filter materials are stretched on the outer peripheral surface, are laid in the lower layer of the sand beach. The beach stabilization structure is described.
[0005]
[Problems to be solved by the present invention]
Each of the conventional techniques described above has some beneficial effects. However, for example, the drain structure described in Japanese Patent Application No. 6-18826 and the drawings in particular in FIGS. 6 and 7 is a rectangular parallelepiped by connecting an upper frame member and a lower frame member by a pillar member using steel. A steel frame body with a shape is formed, and an expanded metal is stretched on its outer peripheral surface to form a box cage structure, and a filter material such as a mesh canvas that prevents sand intrusion is stretched on its outer surface, Stone is packed as a filling material. The drain structure shown in FIG. 10 and FIG. 11 has two rectangular steel pipes arranged in parallel, or concrete blocks are arranged at the four corners, and filter members are stretched on both upper and lower surfaces, and expanded metal is further provided on the outer surface. Is formed into a rectangular parallelepiped box cage structure.
[0006]
An object of the present invention is to improve the drain structure.
A further object of the present invention is to use a single-grain crushed stone as a filling material, or a mixed crushed stone prepared by mixing a single-size crushed stone, as well as locally generated earth and sand and gravel as a filling material. By stuffing the above-mentioned filling material into a flexible bag body and combining it with a steel fence frame, the workability of laying work is improved and the construction period can be shortened. It is an object of the present invention to provide a stabilization structure for a beach that can easily form a filling material suitable for the particle size.
[0007]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the stabilization structure of the beach according to the invention of claim 1 is a flexible bag made of a synthetic resin net having a mesh size small enough not to pass crushed stone, gravel and earth and sand. Filled with a filling material consisting of one or more of the crushed stone, gravel and earth and sand, and the flexible bag body is stacked and stored in a plurality of stages in the height direction within a rigid steel frame. In addition, the upper bag body is small enough not to allow sand to pass through, and is packed with fine filler, and the lower bag is coarse and packed with coarse filler. A large number of steel fence frames having the above-described configuration are embedded continuously or discontinuously in a sand beach of the shoreline so as to be orthogonal to the shoreline.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a flexible bag made of a synthetic resin net having such a small mesh as to pass through crushed stone, gravel, and earth and sand is packed with a filling material composed of one or more of crushed stone, gravel and earth and sand. It is transported to the laying site, and stored in multiple layers in the height direction inside the steel fence frame that is rigid on site. The crushed stone is packed at the quarry site, and the locally generated earth and sand is packed in the bags at the site. However, it is also possible to carry the flexible bag body filled with the filling material to the laying site after having been previously stored in the steel frame.
[0010]
Incidentally, flexible bag body, the water permeability is required in the construction site, and to determine the size of the mesh according to the particle size of Chutsume material to be obtained, a mesh on the degree upper bag body impervious to sand Use small packing material, pack the fine-grain filling material, roughen the mesh of the lower bag, and pack the coarse filling material . As the steel rod frame, a so-called rebar rod having a height of about 200 cm × 500 cm × 150 cm is preferably used, but as long as the strength and rigidity necessary for shape retention are expressed, Regardless of the type and structure of the material.
[0011]
【Example】
Next, the illustrated embodiment of the present invention will be described.
First, Fig. 1 shows a rebar rod 1 used as a steel rod frame used for stabilization of a sandy beach near the beach shoreline, and a flexible synthetic resin (geotextile) filled with a filling material 2 to be housed in this. The relationship structure with the bag body 3 of the product is shown. The size of the reinforcing bar 1 and the bag 3 is set to about 200 cm × 500 cm × 150 cm so as to facilitate the carrying and laying operations. As shown in the development view of FIG. 2, the reinforcing bar rod 1 is highly efficient to the laying site in the expanded state or the folded state in which the connecting sides of the six-sided reinforcing bar network including the lid are connected flexibly by the coil 4. Transported. At the laying site, the bag 3 that has been packed and transported in advance with the filling material 2 is placed on a reinforcing bar net that is the bottom of the reinforcing bar 1 and then the remaining five sides are assembled and connected, Complete the rebar 1 with the lid. However, the procedure of previously assembling the reinforcing bar 1 and suspending and storing the bag 3 in this assembly and covering the upper surface is also appropriately implemented.
[0012]
In the above case, the same shape and size bag 3 is stored in two upper and lower tiers in a single reinforcing bar, and the upper bag is made of a material with a small mesh so that sand particles cannot pass through. As shown in the figure, it is packed with fine filling material, and the lower bag is made of a coarse mesh, and coarse crushed stones are packed as filling material according to the roughness of the mesh. you out.
[0013]
In addition to the case where the bag 3 is stuffed with crushed stone at a quarry or the like and transported to the laying site, it is also possible to use the soil that has been generated locally in the laying site. .
As shown in FIG. 3, a large number of rebar rods 1 containing the above-described bag bodies 3 are embedded continuously or discontinuously on a beach sand beach. Preferably, the height of the reinforcing bar 1 is buried in the sandy beach, and the reinforcing bars are laid out in a regular arrangement so that the upper surface of each reinforcing bar 1 forms a flat surface. An anchor 5 is also applied to fix the position of the laid reinforcing bar. Sand 6 is laminated on the upper surface of the reinforcing bar laid in this way so as to form a sandy beach.
[0014]
[Second embodiment]
FIG. 4 shows that a metal mesh cage 7 is first stored in a steel cage frame 1 manufactured by welding assembly of reinforcing bars, and the filling material is inserted into the geotextile flexible bag 3 into the mesh mesh cage 7. The embodiment which performs the stabilization process of the beach by the structure which accommodated the stuffed thing is shown. The flexible bag 3 is packed with a filling material composed of one or more of crushed stone, gravel and earth and sand according to the size of the mesh. The wire mesh cage 7 is used for the purpose of preventing the flexible bag 3 from protruding from the gap between the steel cage frames 1 having a coarse box frame structure. Therefore, instead of using the wire mesh cage 7, it is also possible to implement a configuration in which a similar wire mesh is stretched on the inner surface of the steel cage frame 1.
[0015]
[Effects of the present invention]
According to the present invention, single crushed stone or mixed crushed stone prepared by mixing single crushed crushed stone, gravel, or a mixture of two or more kinds of locally generated earth and sand can be used as the filling material. The filling material is packed in a flexible bag made of a synthetic resin net with a mesh that is small enough to pass through the above-mentioned crushed stones, gravel, and earth and sand, and the bag is stored in a rigid steel frame. It is structurally stable because of the construction. The filling work is carried out at a quarry, and the packed bag is transported to the laying site as it is, and stored in the steel fence frame and laid, so that a permeable layer is formed under the sandy beach. Greatly improves the performance. That is, since the steel slag frame has strength and rigidity, it can be manufactured with a large laying area, the workability in the vicinity of the dividing line is improved, and the construction period is shortened. The deformation of the flexible bag body can be suppressed by the steel cage frame body, the laying accuracy is good, and the flexible bag body and the steel cage frame body can be easily integrated. By changing the mesh size of the bag body, it is convenient to form a water permeable layer with performance suitable for the installation site. In addition, a plurality of bags in the steel casing frame are installed in the vertical direction. Since the filling material is filled with grains, a water permeable layer suitable for the site of construction can be constructed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a steel cage frame and a flexible bag separated from each other.
FIG. 2 is a developed perspective view of a steel cage frame.
FIG. 3 is a cross-sectional view showing a state of laying on a sandy beach.
FIG. 4 is a perspective view showing a second embodiment of the present invention in an exploded state.
[Explanation of symbols]
1 Steel Fence Frame 2 Water-permeable Material 3 Bag

Claims (1)

A flexible bag made of a synthetic resin net having a mesh size small enough to pass through crushed stone, gravel, and earth and sand is packed with a filling material consisting of one or more of crushed stone, gravel, and earth and sand, The flexible bag is stored in a stack of multiple layers in the height direction within the rigid steel frame , and the upper bag has a small mesh size that does not allow sand to pass through. It is packed, the mesh of the lower bag body is coarse, packed with coarse filling material, and a number of steel slag frames of the above configuration are continuously or discontinuously laid on the sandy beach. A stabilization structure on the beach, characterized by being embedded in an orthogonal configuration.

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