JPS5853122B2 - wave-dissipating dyke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wave-dissipating bank provided to reduce or eliminate the influence of waves and currents on the oscillation or horizontal movement of a moored floating structure.

For example, a particularly important issue in constructing a marine airport consisting of a floating structure is to minimize the oscillation and horizontal movement of the floating structure so that aircraft can take off and land safely.

The main causes of oscillation or horizontal movement of floating structures are weather and sea phenomena such as wind, waves, and currents, and mooring devices that hold floating structures in place against this phenomenon are more effective than examples. This is where safety is required.

As a means of meeting such demands, a method of erecting floating breakwaters around marine airports has been proposed.

However, in the case of wave-dissipating breakwaters formed as floating bodies, there is a method of dissipating waves by enlarging the floating wave-dissipating breakwater itself to the maximum wavelength width.
Alternatively, there is a wave-dissipating method in which the wave-dissipating levee is made to interfere with the waves and oscillate, but the former is unrealistic because it becomes too huge, and the latter is a wave-dissipating method that constantly corresponds to the fluctuation cycle of the waves. Even if it is technically possible to create interference oscillations, it is extremely difficult.

In view of the above points, the present invention aims to provide a wave-dissipating levee that is extremely easy to construct, can be constructed in a short period of time, and is extremely economical. explain.

In Figures 1 to 3, 1 is a wave-dissipating dam body made of steel or reinforced concrete, etc. The wave-dissipating dam body 1 has a fish belly shape, and cylindrical bodies 2 are formed at both ends. has been done.

The inside of the wave-dissipating dam body 1 is partitioned into a plurality of chambers by a partition wall 3, and each chamber communicates with each other through a plurality of holes vertically bored in the partition wall 3.

Further, a water intake valve body 4 for taking in water into each chamber is provided approximately at the center of the wave-dissipating dam body 1.

The cylindrical body 2 formed at both ends of the wave-dissipating dam body 1 has a pipe-shaped vertical support 6 whose tip is driven into the ground 5 on the seabed.
are inserted, and the adjacent cylindrical bodies 2, 2 formed at the ends of the adjacent wave breakwater main bodies 1 are sandwiched by an upper support member 7 and a lower support member 8 located above and below, respectively.

The upper support member 7 is constructed in two parts and is fastened to the vertical supports 6, 6 by bolts and nuts 9.

Further, the lower support member 8 is supported by a bolt nut 10 with the cylindrical bodies 2, 2 sandwiched between the upper support member 7 and the lower support member 8.

At this time, the lower half of the breakwater main body 1 is submerged in the sea.

Further, the upper support member 7 is provided with inclined holes facing each other along the direction perpendicular to the longitudinal direction of the wave-dissipating dam body 1, and the tips of the inclined holes are driven into the ground 5 of the seabed. A pipe-shaped inclined column 11 whose head is fixed to the upper support member 7 is inserted.

Next, the construction procedure of the wave-dissipating levee having the above configuration will be explained.

First, an upper support member 7 and a lower support member 8 are fastened to the upper and lower parts of the cylindrical body 2 formed at both ends of the wave-dissipating dam body 1, respectively, with bolts and nuts 10 while holding the cylindrical body 2 between them. The vertical struts 6 are inserted into the body 2, the bolts 9 are assembled loosely attached to the upper support member 7, and the body is floated on the sea and towed to the construction site.

At the construction site, first open the water intake valve body 4 and apply fresh water into the wave-dissipating levee main body 1, and place it in such a state that the wave-dissipating dam main body 1 does not sink and can change its position at sea. After determining the installation position of the vertical support 6, one vertical support 6 is driven into the ground 5 on the seabed by, for example, digging out the earth and sand inside the vertical support 6 to sink it to a predetermined depth, and then Drive the other vertical support 6 in the same manner.

At this time, the supplementary portion of the vertical support 6 is added by on-site welding at sea.

Next, the water intake valve body 4 is opened to take water into the breakwater main body 1, and the breakwater main body 1 is lowered to a predetermined water level, for example, to a level where the water line of the breakwater main body 1 and the average tide level 12 coincide. let me,
The wave-dissipating dam body 1 is positioned with a gap left between the wave-dissipating dam body 1 and the seabed surface, and the upper support member 7 is attached to the vertical support 6.
Tighten and secure with bolts and nuts 9.

Next, the inclined support 11 is inserted into the inclined hole provided on both sides of the upper support member 7, and the inclined support 11 is driven into the seabed ground 5 to a predetermined depth in the same manner as the vertical support 6 (the fourth Figure A).

Next, the upper support member 7, the lower support member 8, and the vertical support 6 are attached to only one end, and fresh water is poured into another breakwater main body 1 that is towed to the construction site, and the breakwater main body 1 is lowered to a predetermined water level. Then, the cylindrical body 2 formed at the other end is positioned between the upper support member 7 and the lower support member 8 attached to one end of the breakwater main body 1 already fixed in a predetermined position, and the upper support member 7 and A vertical support 6 is inserted into the cylindrical body 2, and an upper support member 7 is loosely attached to the vertical support 6 with bolts and nuts 9 in a state that the vertical support 6 does not protrude beyond the lower support member 8.

Next, the vertical support 6 inserted into the cylindrical body 2 formed at one end of the breakwater main body 1 is positioned and driven to a predetermined depth (FIG. 4B).

Next, the vertical support 6 inserted into the cylindrical body 2 formed at the other end of the wave breakwater main body 1 is driven into a predetermined depth, and then the inclined hole of the upper support member 7 attached to one end of the wave breakwater main body 1 is The inclined support 11 is inserted into the hole, and the inclined support 11 is driven to a predetermined depth.

Thereafter, the wave-dissipating levee is constructed by sequentially connecting the wave-dissipating dam bodies 1 in the same manner.

In this way, the wave-dissipating dam body 1 is floated and towed to the construction site of the wave-dissipating dam, and the wave-dissipating dam body 1 is fixed by the vertical struts 6 and the inclined struts 11 and connected in sequence. Since a breakwater can be constructed, the construction period can be significantly shortened compared to conventional breakwaters or floating breakwaters, and it can be constructed at a lower cost.

Further, in this wave-dissipating levee, each wave-dissipating levee main body 1 is firmly supported by a vertical column 6 and an inclined column 11 driven into the ground 5 of the seabed, and each wave-dissipating dyke main body 1 is supported by an upper support member 7 and an inclined column 11. Since it is firmly connected by the lower support member 8, no matter what the sea surface condition outside the levee is, this wave-dissipating levee will dissipate the waves that hit the shore.
Not only does it maintain a calm sea level within the levee, but it also acts as a key wall to reduce the velocity of tidal currents, and can significantly reduce the external forces of oscillation or horizontal movement exerted on moored floating structures.

In addition, as shown in FIG. 5A, two or more breakwater main bodies 1 may be integrally formed via a cylindrical body 2, and in this case, a cylinder provided at a joint of the wave breakwater main body 1a In body 2,
An upper support member 7a and a lower support member (not shown) in which only one hole for inserting the vertical support 6 is formed are attached, and these are supported by the vertical support 6 and the inclined support 11.

Further, as shown in FIG. 5B, two pairs of opposing inclined holes may be provided in the upper support member 7b, and four inclined columns 11 may be driven in the upper support member 7b. By forming the opposing inclined holes 7c in a straight line with the two vertical struts 6 insertion holes, the breakwater main bodies 1 can be arranged in a staggered manner.

Figure 6 shows an example of constructing a wave-dissipating levee around a marine airport 13 consisting of a moored floating structure.
By providing a retaining member 14 that can be attached and detached to the vertical support 6 at one end of b, the wave-dissipating dam main body 1b can be rotated around the vertical support 6 inserted into the cylindrical body 2 formed at the other end. This serves as an entrance and exit for the floating body 15.

In the above embodiment, a gap is provided between the breakwater main body 1 and the seabed surface, and an example is explained in which the seawater can freely flow in and out of the breakwater through this gap. If providing this gap may cause the moored floating structure to be affected by tidal currents and cause horizontal movement, configure the wave-dissipating dam body 1 in whole or in part to reach the seabed surface. It's okay.

It is also possible to construct a wave-dissipating levee so as to surround a specific sea area using the wave-dissipating levee body 1 that reaches to the seabed, and use this as a reservoir for tidal power generation.

The present invention can be carried out as explained above, and according to this, the wave-dissipating levee has a sufficient wave-dissipating effect, is easy to construct, can be constructed in a short period of time, and is extremely economical. It can provide a wave-dissipating breakwater, and its industrial value is extremely high.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view showing the connection part of the wave-dissipating dam body, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a plan view showing the connection part of the wave-dissipating bank body. 4A-B are explanatory diagrams of the construction procedure; FIGS. 5A-C are plan views showing modified examples of the connection portion; and FIG. 6 is a plan view showing the overall configuration. It is. Lla, Ib...-Wave breakwater main body, 2...
Cylindrical body, 5... Submarine ground, 6... Vertical support, 7.7a. 7b, 7c... Upper support member, 8...
Lower support member, 10... Bolt nut, 11.
・・・・・・Slanted support.

Claims (1)

[Claims] 1. A plurality of hollow breakwater main bodies each having a cylindrical body formed at least at both ends, a vertical support that fits inside the cylinder and has its tip driven into the ground at the bottom of the water, and an adjacent end of the wave breakwater main body. an upper support member and a lower support member that are fitted onto both of the vertical struts that are fitted into the cylindrical body of the section and are located above and below the adjacent cylindrical bodies to support the cylindrical body; A connecting member is provided to connect the upper support member and the lower support member, and at least one set of two opposing inclined holes is bored in the upper support member, and an inclined column is inserted into the inclined hole. 1. A wave-dissipating levee, characterized in that the tip part is driven into the ground at the bottom of the water, and the upper support member is fixed to the vertical support.