JPH0560004B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wave-dissipating seawall intended for the development of ports, fisheries, marine sports, artificial islands, and the like.

[Conventional technology and its problems]

Conventionally, there are various types of seawalls, including gravity type seawalls using caissons, blocks, etc., cellular type seawalls with a cell structure using steel sheet piles, concrete sheet piles, etc., as well as rubble seawalls and wave-dissipating block-covered seawalls. On the other hand, if we take as an example the construction of an artificial island through offshore land reclamation as part of the development of coastal land, it will be developed from the coast to the offshore, and the related seawalls will also need to be designed with consideration given to deep water areas.

The rubble type revetment and the wave-dissipating block covered revetment are used in relatively shallow areas and have a sloped surface, while others have an upright structure.

However, since the upright wall of the seawall has a high wave reflectivity, for example, in the case of a harbor shore, reflected waves are generated in the harbor, causing inconvenience to ship navigation, anchorage, fishing, etc., and as mentioned above, it will become worse in the future. In locations with large water depths and large wave heights, such as the seawalls of reclaimed artificial islands that are increasingly being developed offshore, conventional types of seawalls are difficult to maintain in terms of wave reflectivity and stability.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a seawall which is excellent in safety by reducing the reflectance of waves to prevent large reflected waves and reducing the maximum wave force that the seawall receives.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a plurality of partition walls in parallel with the front and rear walls inside a box-shaped caisson made of reinforced concrete installed on the sea coast, and has window-like transparent holes in the front wall and each partition wall. The main idea is that a large number of stones are formed in a staggered manner between the walls, and rubble stones are piled up in an inclined manner within the caisson.

[Effect]

According to the present invention, the front wall and bulkhead of the caisson are provided with transmission holes, through which part of the rough waves from the open sea pass through, but the positions of the transmission holes are shifted from each other, so that the passage of the waves is prevented. The reflectance is reduced step by step for each degree and returned as a slow flow.

Additionally, the rubble within the caisson provides weight and stability to the caisson, and contributes to absorbing the impact force of waves flowing into the caisson.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a longitudinal sectional side view showing one embodiment of the wave-dissipating seawall of the present invention, and 1 in the figure shows a box-shaped caisson made of reinforced concrete. This caisson 1 is installed horizontally on rubble ground 2 buried in the coastal seabed.
Reinforced concrete bulkheads 12 and 13 are installed inside parallel to the front wall 11 facing the sea and the rear wall 14 facing the land.
has been established.

Now, each bulkhead 1 including the front wall 11 of the caisson 1
If 2 and 13 are ordered and referred to as odd numbered and even numbered numbers, the front wall 11 of the caisson and the odd numbered partition walls 13 are grids having window-like passage holes 10 of the same shape at positions where they can be seen through. Formed in the body (see Figure 2),
The even numbered walls 14 are formed as a lattice body having passage holes 10 having the same shape as the passage holes 10 of the odd numbered walls 13 but at different positions (see FIG. 3).

That is, although the rear wall 14 is a blind plate, the front wall 11 and the partition walls 12 to 13 have window-like passage holes 10 arranged in a staggered manner on each wall.

Note that it is also possible to form the opening portion of each transmission hole 10 into a tapered shape, or to change the shape and dimensions. Further, the number of partition walls can be increased or decreased as appropriate depending on the construction conditions of the seawall.

Immediately after the caisson 1 is installed on the rubble ground 2 in this manner, a slope facing the sea side is formed inside the caisson 1 and rubble stones 3 are thrown in a mountain shape to stabilize the caisson 1.

After constructing the ceiling wall of the caisson 1, a stepped parapet 4 made of reinforced concrete was formed along the sea-side edge of the upper surface.

Further, in order to increase the stability of the caisson 1, a concrete block 7 for preventing scour is provided on the front surface of the base of the caisson 1 as necessary.

8 in the figure is a crushed stone layer buried in a natural slope along the back of the rear wall 14 of the caisson 1, especially in a reclaimed seawall. This is a copy for you to keep.

By the way, since caisson 1 is lighter than the filled caisson, the required width of the embankment must be wider, but the 4th caisson
As shown in the figure, the front wall 11 and rear wall 14 of the caisson 1
A sleeve pipe 5 is buried upright in each corner of the caisson 1, and immediately after the caisson 1 is installed underwater,
Steel pipe piles 6 are passed through the sleeve pipes 5, and their tips are inserted into the ground to a required length, and the steel pipe piles 6 are filled with concrete.

In this way, it is possible to increase the stability of the caisson 1 by imparting shear force due to sliding to the steel pipe pile 6, and as a result, it is possible to suppress the required width of the cross section of the embankment body of the caisson 1 to a certain degree. Become.

Furthermore, if the anchor 15 is removed from the ground, stability is further increased.

Next, to explain how to use it, high-speed waves with a large impact coming from the open sea collide with the front wall 11 of the caisson 1 and are blocked, but some of the waves pass through the transmission holes 10 in the front wall 11. However, when it reaches the next even-numbered wall 12, the penetration hole 10 of the partition wall 12 is connected to the front wall 1.
Since the position is shifted from that of No. 1, after colliding with the wall 12, the flow is divided into the permeation hole 10 near the wall 12. The wave flow that passed through the even-numbered wall 12 similarly collides with the next odd-numbered wall 13, and the wave flow that passes through the nearby transparent hole 10 and is split off collides with the rear wall 14 of the caisson 1 and is reflected and flows out. However, on the way to that point, Bulkhead 1
3 and 14, the wave power is dispersed and attenuated, so its reflectance is almost non-existent.

On the other hand, the slope of the rubble 3 in the caisson 1 is the bulkhead 1.
Since the number of transmission holes 10 at 2 and 13 is gradually reduced, the wave force applied to each of the partition walls 12 and 13 is equalized. Further, the transmitted wave current collides with the slope of the rubble 3, and a downward force is generated in the wave force, which helps the safety of the caisson 1. In addition, the wave flow is caused by the partition wall 12,
3 and the rear wall 14 of the caisson 1, and as it flows out, the number of transmission holes 10 is gradually increased, so that the wave power is dispersed and attenuated, reducing the reflectance.

On the other hand, the parapet 4 on the upper surface of the caisson 1 receives the horizontal impact force of the shock wave by dividing it into multiple parts by the vertical surface of each stage, and further receives the vertical impact force of the falling wave by the horizontal surface of each stage. It protects the safety of the seawall by reducing wave energy and reducing the maximum wave force that the seawall receives.

Although caissons have a wide seawall due to their weight, they are useful as mooring shores in areas where waves are not very large, and the bulkheads and rubble inside the caisson can also be used as artificial fishing reefs. In addition, as shown in Fig. 5, the stepped battlements 4 can be used as benches for fishing spots or marine sports when the sea surface is calm, contributing to the leisure industry.

〔Effect of the invention〕

As described above, the wave-dissipating seawall of the present invention has a low wave reflectance, does not produce large reflected waves, reduces the maximum wave force that the seawall receives, and has excellent safety. Since it is simple and easy to construct, construction costs are also low.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view showing one embodiment of the present invention;
Figure 2 is a sectional view taken along the line A-A in Figure 1, and Figure 3 is the same as B.
-B line sectional view, FIG. 4 is a side view of another embodiment, and FIG. 5 is a vertical sectional side view showing the same usage example. 1... Caisson, 2... Rubble ground, 3... Rubble, 4... Parapet, 5... Sleeve pipe, 6... Steel pipe pile, 7... Concrete block, 8... Crushed stone layer, 10... Transparent hole , 11...Front wall, 12, 13
...Bulkhead, 14...Rear wall, 15...Anchor.

Claims (1)

[Claims] 1 Inside a box-shaped caisson made of reinforced concrete placed on the sea coast, multiple bulkheads are installed in parallel to the front and rear walls, and window-like penetration holes are arranged in a staggered manner between the walls in the front wall and each bulkhead. A wave-dissipating revetment is characterized by a large number of caisson structures and rubble stones deposited in a sloping manner within the caissons.