JP2006207210A - Corrosion prevention material of wave-extinguishing structure, wave-extinguishing structure and construction method therefor, and housing device for wave-extinguishing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent corrosion of a wave-extinguishing structure or the like. <P>SOLUTION: Tough sheets or the like are stretched and provided at the bottom of a lattice net or a lattice basket constituted by tough materials. Then a hinge for connection is connected to one side of the lattice net or the lattice basket of the corrosion prevention material of the wave-extinguishing structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a material for preventing scouring of a wave-dissipating structure, a wave-dissipating structure, a construction method thereof, and a device for containing a wave-dissipating material for the purpose of preventing scouring in a wave-dissipating structure or a seawall.

  Conventionally, large stones are thrown directly onto the sand ground, the slope of the tip is loosened, stones are piled up to create a foundation, and large blocks and caissons are installed on top of it to build a wave-dissipating structure such as a breakwater or breakwater Although they were building things, the law tips were scoured and stones were scattered, and finally the upper blocks and caisson were damaged, such as moving or falling.

  In order to prevent this even a little, there is also a method of placing a weight on the end of the sheet or mats under the tip of the discarded stone, but this is temporary, and the waves act for a long time. Then, there was a drawback that it turned up or was torn apart and lost its effect.

  4 (a) and 4 (b), a conventional example will be described. A stone or concrete block is put on a support ground 12 in the sea to construct a discarded stone foundation 13, and a caisson is placed on the upper portion of the discarded stone foundation 13. 14 was installed and the dam body 20 was constructed.

  Regarding the relationship between the abandoned stone foundation 13 and the caisson 14, when the mountain 16 a of the wave 16 is on the sea side, the descending wave descends as indicated by an arrow 17 and is dispersed as indicated by an arrow 18.

  On the other hand, when the peak 16b of the wave 16 is on the land side (FIG. 4B), the descending wave descends as indicated by an arrow 19 and is dispersed as indicated by 21.

  As mentioned above, regardless of whether the mountain of waves is on the sea side or the land side with respect to the caisson 14, the direction of the wave is always on the stone foundation 13, so there is a risk of being subjected to scouring Absent. In other words, the positional relationship between the discarded stone foundation 13 and the caisson 14 must always be as shown in FIGS. 4 (a) and 4 (b).

As for scour prevention such as revetment, which has been known in the literature, a basin such as a corrugated cell or a scour prevention sheet in which a fin for preventing downward flow is installed on the revetment, or a weight is detachably attached to the top surface of the tip. Inventions that are detachably attached to the end are known.
Japanese Patent Publication 45-35627 Shoko 63-30444 JP2003-221817A

  The invention of the cited document 1 lays a flexible sheet at the bottom of a structure, and has a problem that stones, concrete blocks and the like cannot be held integrally.

  The invention of Cited Document 2 is an invention having a scouring prevention sheet made of a flexible material laid at the tip of a corrugated cell or the like.

  Cited Document 3 has a gist of a structure in which a perforated mat is connected to the lower end of the masonry portion.

  Each of Patent Documents 1 to 3 is an invention in which the scouring portion is covered with a sheet or the like, and there is a problem that requires consideration for materials, installation structure, overall shape, and the like regarding strength, durability, and the like.

  The scouring of the foundation of the wave-dissipating structure is not only due to direct waves, but also due to the difference in water level between the top (mountain) and the bottom (valley) of the waves, A water flow is generated (piping phenomenon). At this time, sand is blown up or sucked out, and it has been found in recent experiments that stones and concrete blocks fall apart. 4A and 4B illustrate the piping phenomenon. Arrow 17 indicates a path where water can flow from the peak of the wave toward the valley, and the tip of the arrow dives as indicated by arrow 18 or the sand below the rubble is blown up as indicated by arrow. It is sucked out, and at this time, the stone sinks or is thrown away.

  The present invention has developed a scouring prevention material to increase the strength and to devise the installation to solve the conventional problems.

  In other words, the invention of the material is characterized in that a tough sheet is stretched and fixed to the bottom of a lattice mesh or lattice cage made of a tough material, and a connecting hinge is connected to one side of the lattice mesh or lattice cage. The sheet is made of a thin steel plate, canvas, rubber, a synthetic resin sheet or a mat.

  According to another aspect of the present invention, there is provided a wave-dissipating material characterized in that the scouring prevention material according to claim 1 is pivotally connected to all or a part of the outer periphery of a lattice net or lattice cage made of a tough material. It is a storage device.

  Next, the invention of the wave-dissipating structure is characterized in that one or both of the stone material and the concrete block are accommodated and fixed in the wave-dissipating material accommodating device according to claim 3 installed on the ocean ground. It is a thing.

  Furthermore, the invention of the method is that after installing the wave-dissipating material accommodation device according to claim 3 on the ground on which the coastal wave-dissipating structure is to be installed, one or both of a stone and a concrete block are placed in the accommodation device. It is the construction method of the wave-dissipating structure characterized by building up an integral structure by stacking up one by one.

  In the present invention, since strong sheets are stretched on a lattice mesh or a lattice basket as a material, the skeleton is strong, can withstand long-term use, and is hinged to a lattice cage installed on the ground. Following the scouring, the surface can be covered and the progress of the scouring can be effectively prevented.

  The lattice net or lattice cage used in this invention has been improved by the inventor for more than ten years after development, and is used in revetment works in various places in Hokkaido where the impact of waves is the greatest in Japan. Proven (currently alive) and reliable enough.

  However, after scouring and the scouring prevention material stabilizes incline, there is no risk of generating strong external force, so the scouring process is prevented until the material is corroded and decomposed (for example, 100 years). can do.

  Even in a wave-dissipating structure using a conventional lattice cage, it can be seen that the lattice cage facing the sea side is tilted by scouring to prevent the progress of scouring to some extent. Although it remains firmly, this invention is a further improvement in scour prevention.

  In the present invention, since the materials of the lattice net or lattice cage with the sheets stretched are hinged to the sea side of the lattice mesh or lattice cage that supports the wave-dissipating structure, the material is automatically used as the scouring progresses. It is effective to prevent scouring.

  In addition, since the scouring force of waves gradually decreases with the inclination of the lumber, there is an effect that the progress of the scouring can be automatically and completely stopped at last.

  According to the present invention, a lattice car is configured by installing a lattice-like side plate made of steel upright on four sides of a lattice-like bottom plate made of steel. One side of the scouring prevention material is pivotally attached to the sea side edge of the lattice cage bottom by a chain. The scouring prevention material is formed by stretching a thin steel plate on the bottom surface of a lattice net made of steel.

  Next, the lattice car is placed on the ground where the wave-dissipating structure is to be installed, and a stone or concrete block is laminated on the inside thereof to construct the wave-dissipating structure.

  Referring to FIGS. 1A and 1B, an embodiment of the present invention will be described. Steel plates 1 and 2 are arranged vertically and horizontally to form a lattice bottom 3, and side plates 4 are erected around the four sides to form a lattice cage 5. did.

  One side of the scouring prevention material 6 is connected to one side of the lattice car 5 via a chain 7 so as to be rotatable. The scouring prevention material 10 constitutes the scouring prevention material 10 by adhering a thin steel plate 9 (for example, a thickness of 3 mm) or a sheet or a mattress to the upper surface or the lower surface of the lattice net 8 knitted with the steel wire 6. The thin steel plate 9 may be applied to the upper and lower surfaces of the lattice net 8.

  Examples of constructing a wave-dissipating structure according to the present invention will be described with reference to FIGS. 2 and 3. A lattice net 8 is constituted by steel wires 6, and a thin steel plate 9 is stretched on the lower surface thereof to provide a scouring prevention material. Obtained.

  On the other hand, a lattice car is made of steel, and one side of the scouring prevention material is connected to one side of the lattice car.

  A stone 11 or a concrete block (or both) is put in the lattice car 5 and stacked in the lattice car 5 to form a wave-dissipating structure 15.

(A) The enlarged plan view of the lattice basket which connected the material for scouring prevention of this invention, (b) The same enlarged front view, (c) The partially enlarged front view of the same scouring preventing material. The block diagram of the Example which similarly builds a wave-dissipating structure. (A) The conceptual diagram at the time of installation of a wave-absorbing structure similarly, (b) The conceptual diagram at the time of receiving scouring, (c) The partial enlarged plan view of a connection part. (A) Conceptual diagram when there is a wave mountain on the sea side in a conventional construction example, (b) Conceptual diagram when there is a wave mountain similarly on the land side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Steel materials 3 Lattice bottom 4 Side plate 5 Lattice cage 6 Steel wire 7 Chain 8 Lattice net 9 Thin steel plate 10 Scouring prevention material 11 Stone material 12 Support ground 13 Abandoned stone foundation 14

Claims (5)

  A wave-dissipating structure characterized in that a tough sheet is stretched and fixed to the bottom of a lattice mesh or lattice cage made of a tough material, and a connecting hinge is connected to one side of the lattice mesh or lattice cage. For preventing scouring.   2. The material for preventing scouring of a wave-dissipating structure according to claim 1, wherein the sheets are thin steel plate, canvas, rubber, synthetic resin sheet or mat.   An apparatus for accommodating a wave-dissipating material, wherein the scouring prevention material according to claim 1 is rotatably connected to all or a part of the outer periphery of a lattice net or lattice car made of a tough material.   A wave-dissipating structure characterized in that one or both of a stone material and a concrete block are accommodated and fixed in the wave-dissipating material accommodation apparatus according to claim 3 installed on the coastal ground.   After installing the wave-dissipating material accommodation device according to claim 3 on the ground on which the coastal wave-dissipating structure is to be installed, one or both of stone materials and concrete blocks are sequentially stacked and integrated into the accommodation device. A method of constructing a wave-dissipating structure characterized by constructing a structure.

Images