JPH02213510A - Structure laid on sea bottom - Google Patents

Abstract

PURPOSE:To make it possible to cope with variations of the sea bottom by arranging a plurality of base members formed by charging heavy filler into bags, in a single layer, and by surrounding each adjacent base members with a net-like member while providing leaf members on the upper side thereof. CONSTITUTION:A plurality of base members 4 formed by charging heavy filler 3 such as sand, crushed stones, matte or the like in bags 2 are laid in two layers in parallel with each other so as to form a structure adapted to be embedded in the sea bottom. Then, they are all surrounded by a net-like member 5 made of water resistant and corrosion resistant synthetic fibers such as polyester, polyethylene, polypropylene or the like, so as to form an array body 6. Further, a plurality of leaf members 7 made of the same material as that of the net-like member 5 are attached to the upper surface side of the body 6. Further, in dependence upon the conditions of a sea bottom where the structure is laid, a shore and waves, the dimensions, weight and number of the base members are adjusted. With this arrangement in which the surrounded members are soft, it is possible to cope with variations of the sea bottom, and the structure may be laid in safe. Thereby it is possible to maximumly exhibit the wave damping function and sand trapping function of the leaf members.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a structure for laying on the seabed, which is laid on a seashore to attenuate waves and control the movement of sand.

Conventional technology It is well known that seaweed plays a major role in preventing wave attenuation and sand erosion and runoff on the coast, and efforts have been made to propagate seaweed for a long time, but more aggressive efforts are being made. Attempts have been made to attach artificial seaweed (hereinafter referred to as "artificial seaweed") to a fixing structure and lay it on the coast. In other words, as artificial seaweed, we use leaves such as am and film made of synthetic resin and cut them into specified widths such as ribbons and slit yarns, use nets or mats as the fixing structure, and fix them to the seabed with weights or stakes. In addition, there are also structures made of iron, concrete, or a bag filled with sand. Artificial seaweed is also attracting attention as a material for artificial fish reefs.

Problems to be Solved by the Invention Among the above methods, when using weights to secure nets and mats, the resistance against waves and currents is insufficient, and large waves and currents may cause them to move or be destroyed. In addition, when fixing with piles, the supporting capacity may decrease when the seabed is scoured, or installation may be difficult if the seabed is hard. Furthermore, when two nets are laid on the seabed, it is difficult to attach fronds and stand them underwater, resulting in insufficient wave attenuation and sand trapping effects. Next, in afforestation methods in which foliage is fixed using iron or concrete, the contact parts of the foliage may wear out and break due to repeated loads from waves. Furthermore, when a bag filled with sand or the like is used alone, it loses stability when the seabed changes due to scouring, etc., making it difficult to follow.

The present invention solves the above-mentioned problems.The present invention is a structure for laying on the seabed that has a flexible structure that allows easy adjustment of the overall shape and weight, allows the lobes to stand in the water, and follows fluctuations caused by scouring of the seabed. The purpose is to provide the body.

Means for Solving the Problems In order to solve the above-mentioned problems, the structure for laying on the seabed of the present invention comprises a plurality of base bodies each formed by storing a heavy filler in a bag and arranged in at least 11 layers. Adjacent base bodies are movably covered by a net-like body, and a plurality of leaves made of synthetic resin are disposed on the upper surface side.

In the structure for laying on the seabed of the present invention, a base formed by storing a heavy filler in a bag as described above is used. The bag is preferably made of water-permeable fabric such as 8Ia material made of water-resistant and corrosion-resistant synthetic fiber such as polyester, boethylene, or polypropylene, or nonwoven fabric, and the weight filler is sand, crushed stone, ore slag. etc. As for the base, a cylindrical base is preferable to obtain a flexible structure, and a base with a diameter of 10 to 20 cm and a length of 1 to 3 Tr is preferable in terms of manufacturing, handling, and ability to follow the seabed shape. In addition, in order to obtain a flexible structure, the storage of the heavy filler inside the bag is preferably 70 to 100%, preferably 80%.
~90%.

A plurality of the base bodies are arranged in at least 11w, and the adjacent base bodies are covered with a net-like body in such a manner that they can be freely displaced to form an array. By doing this, the predetermined plurality of bases are assembled into a predetermined shape by the net-like body, and do not separate, and the adjacent bases can be freely displaced, so that they can be sunk on the seabed. In this case, it can follow the shape of the seabed well, forming an uneven surface as a whole and covering the seabed well. The number of substrates to be arranged can be set arbitrarily depending on the size of the substrate, the condition of the seabed, and other conditions.In addition to one layer, they may be stacked in two or more layers, depending on the condition of the seabed and the strength of waves. To be determined as appropriate. Polyester, similar to bags, as mesh
A mesh made of water-resistant and corrosion-resistant synthetic materials such as polyethylene and polypropylene, a molded mesh made of synthetic resin, a metal mesh, etc. can be used.

Next, a plurality of leaf-like bodies are arranged on the upper surface side of the array in which several layers of the base bodies are arranged and covered with a net-like body.

This leaf-like body is made of water-resistant and corrosion-resistant synthetic 8
N and film ribbons, split yarns, etc. are used. This leaf-like body is disposed at a length of 1 to 3 m from the net-like body portion on the upper surface side of the array as necessary. The attachment of the leaf-like body may be done by the net-like body on the upper surface side, but it is preferable that the leaf-like body be engaged with the base and the net-like body on the lower surface side, extend upward, and be knotted at the knots of the net-like body on the upper surface side. This is preferable because it allows alignment of the nodules on the upper surface side of the leaf and the leaf-like body, makes the leaf-like body easier to stand in water, and prevents movement of the net-like body. Further, from the above point of view, it is preferable that the net-like body has a square mesh structure, and the diameter of the base body is an integral multiple of the size of the mesh, in order to further make the leaf-like body stand up easily in water.

The structure for laying on the seabed of the present invention as described above may be formed entirely on land and then transported and carried to a predetermined position on the seabed for installation, but it is also possible to construct only the weight body on land. After formation, the above-mentioned arrangement of the substrates, envelopment with a net-like body, attachment of the leaf-like bodies, etc. may be carried out on a predetermined laying seabed.

Function: In the above configuration, a base body containing a heavy filler is used, and the resistance force is adjusted by adjusting the size, weight, and number of bags depending on the seabed conditions, wave conditions, etc. In addition, a plurality of substrates are arranged in at least one layer, and the adjacent substrates are covered with a net-like material in a freely displaceable state to form a flexible structure, and a leaf-like material is arranged on the upper surface side. Therefore, it is possible to organize the entire body into a predetermined size and shape, and it also closely follows the shape of the seabed and covers it well to prevent scouring, and also creates gaps between each base to release the uplift force of waves. It also increases the wave damping function and sand trapping function of the thallus.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic perspective view showing a 411I structure for laying on the seabed according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the main part of the structure for laying on the seabed, and FIG. -All cut sectional view,
FIG. 4 is a sectional view taken along the line BB in FIG. 2. Figure 1~
In FIG. 4, the submarine buried structure 1 according to the present invention is
A plurality of base bodies 4 each containing a heavy filler 3 are arranged in parallel in two layers inside a bag 2, and the whole is covered with a net-like body 5 to form an array body 6, and the top surface of this array body 6 is It is formed by attaching a plurality of leaf-like bodies 7 to the sides. The base body 4 is a substantially cylindrical body with a diameter of 0.15 mm and a length of approximately 1.45 TIL, and is made of polyester multifilament yarn 1,
000 denier/96 filament, group R: plain weave, weave density: 30 warp/inch, 1125 thread/inch fabric was used to store bag 2, which contained about 75% of the volume of sea sand as weight filler 3. It was formed by The mesh body 5 is made of polyester multifilament yarn 1, 000 denier/96
The filament used was a 0.35#I square-grained filament. Foliage 7 is made of polypropylene film @i1.5c
A ribbon-like material with slits in Ii, for example, packaging p.
p-band), and is attached so as to have a length of 2 m from the net-like body 5 on the upper surface side of the array body 6.

The above-mentioned submarine laying structure 1 was assembled as follows.

That is, the net-like body 5 is expanded, and 30 base bodies 4 are arranged on it in one horizontal row in parallel with adjacent base bodies 4 in contact with each other, and these are arranged in three rows in the length direction so that they are in contact with each other. Then, on top of that, base material 4 is stacked in bales with Mltla.
After being formed into layers, the whole is covered with the net-like body 5 to form an array 6.

In addition, prior to this envelopment, approximately the central portion of the leaf-like body 7 in the longitudinal direction is engaged with each of the base bodies 4 on the lower layer side and the net-like body 5 on the lower surface side thereof, and extends upward from both sides of each base body 4, Further, it extends upward from the two adjacent contact portions of the upper base body 4, and the two adjacent leaf-like bodies 7 are bundled together 8 on the upper surface side of the net-like body 5 after being encapsulated. The leaves 7 were arranged at every 151 points in the longitudinal direction of each substrate 4, corresponding to the mesh pitch of the net-like member 5. Further, at both ends 6a of the array 6 corresponding to the longitudinal direction of the base 4, it is desired to close the ends 6a using the leaf-like bodies 7 (Fig. 4).
.

Since the structure 1 for laying on the seabed of this embodiment has the above-described structure, it is easy to manufacture, and damage to the bag 2 can be easily dealt with by replacing the base 4. The base bodies 4 are grouped together without being separated, and since the base bodies 4 are movable and have a flexible structure, they follow the changes in the shape of the seabed caused by scouring by waves and cover the seabed well. In addition, a gap is created between each base body 4 to release the uplift force caused by waves, allowing stable installation, and the leaf-like body 7 is engaged with the base body 4 on the lower layer and the net-like body 5 on the lower surface side, and the leaf-like body 7 is engaged with the base body 4 on the lower layer and the net-like body 5 on the lower surface side. Since it is attached together with the net-like body 5, it is ensured that each base body 4 is bundled by the net-like body 5, and the position of the net-like body 5 on the upper surface side and the lower surface side is prevented from changing and the base body 4 is prevented from moving. Furthermore, the lobes 7 can stand up easily in the sea, and the wave attenuation function and sand trapping function of the lobes 7 can be maximized. Furthermore, the size of the base 4,
The number, arrangement shape, etc. can be adjusted as desired, and the resistance force can be adjusted.

Effects of the Invention As described above, the structure for laying on the seabed of the present invention is easy to manufacture, and the size, weight, etc. The resistance force can be adjusted by adjusting the number of pieces, and it has a flexible structure in which the adjacent substrates are covered with a net-like body that can be freely displaced, and it follows the shape of the seabed well, allowing it to be easily scoured by waves. In addition to covering the seabed in response to changes in the seafloor that occur during seafloor changes, the gaps between the bases allow the uplifting force of waves to escape, allowing for stable installation, and maximizing the wave attenuation and sand trapping functions of the lobes. It has special effects such as being able to make the most of it.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a structure for laying on the seabed according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the main part of the structure for laying on the seabed, and FIG. FIG. 4 is a cross-sectional view taken along line 3-8 in FIG. 2. DESCRIPTION OF SYMBOLS 1... Structure for laying on the seabed, 2... Bag, 3... Heavy filler, 4... Substrate, 5... Net-like body, 7... Leaf-like body. Agent Hiroshi Tsuru Morimoto Figure 2

Claims (1)

[Claims] 1. A plurality of substrates formed by storing a heavy filler in a bag are arranged in at least a single layer and covered with a net-like body in a state in which adjacent substrates are freely displaceable, and a plurality of substrates are arranged on the upper surface side. A structure for laying on the seabed, characterized by having leaf-like bodies made of synthetic resin.