JP2578911B2 - Seawall protection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to protection of a revetment for preventing breakwaters such as breakwaters, quays, and river embankments from being damaged by waves, and reducing reflected waves for small vessels and the like. It relates to a device for ensuring safety.

[Problems to be solved by the invention]

The revetment is generally constructed by placing concrete, embedding sheet piles, or stacking rocks, etc., but it is damaged by the waves hitting it, so various measures are proposed to prevent damage and further reduce reflected waves. Have been.

An object of the present invention is to propose a protection device for a revetment which has a simpler mechanism than conventional means and is excellent in breakage prevention and wave breaking functions.

[Means for solving the problem]

The protection device of this revetment is provided with a space between the revetment and the revetment in front of the revetment, and is constructed by constructing a sheet pile to form a continuous wall. None, and has a water cut-out, and a water buffer zone is formed between the front face of the revetment and the continuous wall.

 Hereinafter, description will be made with reference to the illustrated embodiment.

The protection device of the revetment shown in FIGS. 1 and 2 comprises a concrete sheet pile 3 in front of a revetment 2 in which a steel sheet pile 1 is built in the front, a gap between the revetment 2 and the revetment 2, and a continuous wall 4 is provided. It is configured.

As shown in FIG. 3, the concrete sheet pile 3 has ribs 5, 5 extending on both side edges of one surface, and a circular cut-out portion 6 at the upper end.
There is a sheet pile 3-1 and a rectangular water cutout 7 as shown in FIG.
There are two types of sheet pile 3-2. The continuous wall 4 alternates these two types of sheet piles 3-1 and 3-2 with the ribs 5 facing the front, and the upper end is formed as a receding inclined surface. It is fixed to the overhang 9. Between the revetment 2 and the continuous wall 4, there is formed one water-permeable buffer zone 10 through which the seawater can freely penetrate through the water-permeable notches 6,7.

In the seawall protection device having this configuration, the continuous wall 3 is inclined and the upper part is receded, so that part of the force of the wave becomes the force of the wave rising upward, and the part of the wave passing through the cut-out portion of the water passage has one side. Since the part escapes to the rear buffer band, the continuously acting wave force is reduced. Also, the pressure of the seawater entering the water buffer zone acts on the back surface of the continuous wall, antagonizes the wave force hitting the front surface, and prevents the continuous wall from being damaged. The waves hitting the continuous wall penetrate into the buffer zone through the notch, gradually attenuate in the process of raising the water level, and the force of the waves hitting the revetment is significantly reduced. The relatively large rectangular cutout and the small circular cutout provided on the continuous wall generate a difference in the speed of the water flow when the wave enters or exits, reducing the attenuation due to the mutual interference of the water flow. Facilitate.

The protection device of the revetment of the embodiment shown in FIGS. 5 and 6 has a concrete sheet pile 3 in which a circular cut-out portion 6 and a rectangular cut-out portion 7 are perforated at an upper end ratio of 2: 1. 3, a continuous wall 4 is built in the front of the revetment 2 as in the case of FIGS. This device also functions in the same manner as the above-mentioned protection device, and exhibits functions of preventing breakage of the revetment and breaking waves.

The protection device of the revetment of the embodiment shown in FIGS. 7, 8, and 9 has a concrete shape having a semicircular cross section, three rows in the upper end in the vertical direction, and a plurality of circular water cutouts 6 perforated. Yaita 3-4
With the circular protruding surface facing outward, the building continuous wall 4 is provided by being fixed to the front face of the revetment 2 with bolts 11 at the side edges of the sheet pile and continuously. Between the revetment 2 and the continuous wall 4, there are formed a plurality of semi-circular water-permeable buffer zones 10 having a semicircular cross section through which the seawater can freely enter through the water-permeable cutouts 6. The 7th and 8th
In the figure, reference numeral 12 denotes a foundation provided on the seabed in front of the revetment.

In this protective device, waves hitting the convex surface of the continuous wall having a circular cross section are dispersed and interfere with each other and attenuate. Further, the waves pass through the water notch 6 and penetrate into the water buffer zone to raise the water level. In this process, the waves are further weakened, and the force acting on the revetment is significantly reduced. Further, the continuous wall having a circular cross section has a large proof stress against the force acting on the convex surface, and is hardly damaged.

〔The invention's effect〕

The present invention is as described above. This protection device of the revetment attenuates the force of the waves at the continuous wall and the water buffer zone to prevent breakage of the revetment and also reduces the reflected waves. Further, the force of the waves acting on the continuous wall is weakened by dispersing or canceling each other, and the continuous wall is hardly damaged.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, wherein FIGS. 1, 2 and 5, 6 are front and longitudinal sectional views, respectively, of a protection device for a seawall, and FIGS. 3, 4 are perspective views of concrete sheet piles. ,
Figures 7, 8, and 9 are a front view, a longitudinal sectional view, and a transverse sectional view of a seawall protection device in which a continuous wall forms an arc-shaped convex surface. 1 ... steel sheet pile, 2 ... revetment, 3 ... concrete sheet pile,
4 ... continuous wall, 5 ... rib, 6 ... circular notch
7 ... square water cutout, 8 ... seabed, 9 ... overhang,
10… water buffer zone, 11… bolt, 12… the bottom of the seabed.

Claims (1)

(57) [Claims] An air gap is provided between the revetment and a seawall to form a continuous wall, and a continuous wall is constructed. The front surface of the continuous wall forms an inclined surface or an arc-shaped convex surface whose upper part is receded. A protection device for a revetment having a water notch and forming a water buffer zone between a front face of the revetment and the continuous wall.