JPH06979B2 - Pile type wave-dissipating structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] As a countermeasure against erosion of the coast facing the open ocean, a wave-dissipating structure is installed in parallel with the shoreline to attenuate the energy of waves traveling from the offshore to the coast and to maintain a quiet area. The invention relates to a pile type wave-dissipating structure that can be secured and a method for constructing the structure.

[Conventional technology]

As a countermeasure against erosion of the coast facing the open ocean, the offshore dike method, in which a deformed block is installed near the coastline in parallel with the shoreline, has been widely used, but this method has a small space used in the quiet area and seawater. It is not sufficient for environmental protection such as replacement, and there is a drawback that maintenance is required due to scattering and settlement of blocks.

[Problems to be solved by the invention]

It is an invention to solve the problems that the space used in the quiet area of the conventional breakwater construction method is narrow, it is not sufficient for environmental protection such as seawater exchange, and maintenance is required due to scattering and subsidence of blocks. .

[Means for solving problems]

This invention constructs a frame structure with a vertical permeable wall, a horizontal permeable plate, and a pile drilling hole integrally or separately, and installs it on a predetermined water bottom ground, and then uses the pile drilling hole as a guide to turn the pile into the water bottom ground. Insert a frame structure with a vertical permeable wall, horizontal permeable plate, and pile punching holes into the pile, which is fixed by driving or piles are piled at a predetermined interval in advance and then integrated or divided. The two vertical permeable walls were installed in parallel with each other at a fixed interval by integrating them, and horizontal permeable plates were installed between the vertical permeable walls at a height near the water level at low tide. The problem is solved by.

[Action]

The two vertical permeable walls are placed in parallel with each other with a certain space, and a horizontal permeable plate is provided between the vertical permeable walls so as to be located at a height near the water level at low tide,
After constructing the horizontal permeable plate and the frame structure integrally or by dividing them and installing them on the specified water bottom ground, the piles are driven using the pile driving holes as a guide to fix them to the water bottom ground, or they are fixed beforehand. The energy of waves traveling from offshore to the coast is attenuated by inserting the piles at a certain interval and then inserting the integrated or divided structures into the piles, and the vertical permeable wall on the back is used to reduce the energy. A quiet area can be secured on the side, and the waves reflected by the structure from the offshore side are also transmitted from the vertical permeable wall, and are offset by the waves reflected from the vertical permeable wall on the back and the horizontal permeable plate, so the reflected wave height is also suppressed. In addition to being a permeable foundation that reduces the impact on the vessel and allows the seawater to freely flow in and out using the space between the bottom of the vertical permeable wall and the seabed, Exchange is also possible at all times. Since the structure is constructed in one piece or divided, it is safe with little offshore construction, stable due to the pile foundation, requires no maintenance, and has little effect on the sea floor.

〔Example〕

The wave-dissipating structure unit A, which is divided in an appropriate length in the shoreline direction of the wave-dissipating structure, is used as a construction unit, and the wave-dissipating structure unit A is sequentially constructed and extended at right angles to the traveling direction of the wave, substantially parallel to the shoreline. The wave-dissipating structure unit A is a foundation pile 1 made of steel or concrete, a vertical water-permeable wall 2 made of concrete having a large number of holes 7 in the front and rear surfaces, or a strip-shaped flat plate 8 arranged at regular intervals L. A water-permeable wall 2a, a horizontal water-permeable plate 3 made of concrete having a large number of holes 9 or a horizontal water-permeable plate 3a having strip-shaped flat plates 10 arranged at a constant interval l, and a beam-shaped steel or concrete connecting them. The frame structure 4 and a columnar steel or concrete frame structure 5 having a pile hole are formed. The two vertical permeable walls 2 and 2a are installed vertically and in parallel, and the horizontal permeable plates 3 and 3a are constructed horizontally at a height near the water level at low tide and between the vertical permeable walls 2 and 2a. . The wave-dissipating structure unit A is constructed by vertically or vertically permeable walls 2, 2a excluding the foundation pile 1, horizontal permeable plates 3, 3a, and skeleton structures 4 and 5 which are integrally or divided on land to produce the seabed 6
The vertical permeable walls 2 and 2a are installed so as to be substantially perpendicular to the traveling direction of the waves, and the foundation piles 1 are driven into the seabed 6 through the pile driving holes provided in advance in the frame structures 4 and 5, The foundation pile 1 and the frame structure 5 are connected and fixed. Under other conditions, the foundation piles 1 are placed on the seabed 6 at regular intervals, and the wave-dissipating structure unit A is inserted into the frame structures 4 and 5 through the pile punching holes provided in advance. Frame structure 4, 5
Connect and fix. In addition, 11 shows a bracing for reinforcement.

〔effect〕

Waves traveling from the offshore to the coast are attenuated by passing through or being reflected by the vertical permeable wall and by passing through or being reflected by the horizontal permeable plate, and a quiet area can be secured on the shore side of the vertical permeable wall. In addition to being able to suppress the wave height reflected by the structure and reducing the influence on the ship, and being the basis of permeability, the space between the lower end of the vertical permeable wall and the seabed is used to create seawater. By freely moving in and out, seawater can be constantly exchanged, which is useful for environmental conservation. Since the wave-dissipating structure unit is constructed in one piece or dividedly, it is safe with little offshore construction, and because it is a pile foundation, it is safe and requires no maintenance, and has little effect on the sea floor.

[Brief description of drawings]

FIG. 1 is a plan view of a coastline, FIG. 2 is a side view of the same, and FIGS. 3 and 4 are perspective views of a wave-dissipating structure unit according to an embodiment of the present application.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inami Sadami Murai, Asahi 1 Tsukuba City, Ibaraki Prefectural Civil Engineering Research Institute (72) Inventor Satoshi Yamamoto 3-25-7 Mejirodai, Hachioji, Tokyo (72) Inventor Hiroo Moritaka 2-3-6 Toyo, Koto-ku, Tokyo K-805 (72) Inventor Tetsuo Kimura 9027-1 Fuchu, Tokyo 9072-1 (72) Inventor Yoichi Takahashi 4-31 Kichijojihoncho, Musashino City, Tokyo (72) Invention Ritataro Kitamura 1-48-5-603 Hatsudai, Shibuya-ku, Tokyo (72) Inventor Hiroshi Umeda 217-10-306 Hanamizumi, Kasukabe City, Saitama Prefecture (72) Hiroki Soeda 4-5-Matsushiro Tsukuba, Ibaraki Prefecture 22 (72) Inventor Hitoshi Nishimaki 7-7-16-201 Togashira, Toride City, Chiba Prefecture (72) Inventor Toshifumi Sato 3440-12 Ushiku, Ushiku City, Ibaraki Prefecture (56) References JP-A-61-216915 (JP, A) ) JP-A-55-132807 (JP , A)

Claims (3)

[Claims] Claim: What is claimed is: 1. Two parallel vertical water-permeable walls, a horizontal water-permeable plate horizontally arranged between the two vertical water-permeable walls at a height near the water level at low tide, and two horizontal water-permeable plates. A skeletal structure that holds the vertical permeable wall and horizontal permeable plate, and has a piercing hole that also serves as a structural material, and is fixed to the ground by a stake that is adhered to the stake hole. A wave-dissipating structure, wherein each of the vertical water-permeable walls has a vertical reflection surface whose lower end does not reach the seabed, and a passage hole that horizontally penetrates the vertical reflection surface. A horizontal reflection surface that reflects the wave that has passed through the passage holes of the vertical water permeable walls and that has flowed between the vertical water passage walls; and a passage hole that vertically penetrates the horizontal reflection surface, At least the region directly below the horizontal water permeable plate passes through the passage holes of the two vertical water permeable walls and is between the vertical water permeable walls. The wave that has flowed in is vertically extinguished by passing through the passage hole to be extinguished, and is also extinguished by mutual interference of the waves reflected by the two vertical reflection surfaces and the horizontal reflection surface or passing through each passage hole. A pile-type wave-dissipating structure in which a seawater exchange passage between the shore side and the offshore side is formed in a region below the vertical permeable wall. 2. The passage hole formed in the horizontal water-permeable plate according to claim 1, wherein the passage holes are formed at intervals along the wave traveling direction and cut along a direction substantially orthogonal to the traveling direction. A pile-type wave-dissipating structure characterized by a missing slit. 3. The pile type wave-dissipating structure according to claim 1, wherein the two vertical permeable walls, the horizontal permeable plate and the frame structure are integrally made of concrete.