JPH0434186Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a breakwater.

BACKGROUND ART Conventional breakwaters are generally constructed by laying rubble with a trapezoidal cross-section on the bottom of the water, and stacking breakwater blocks such as Tetrapod (registered trademark) directly on top of the rubble.

Problems the invention aims to solve However, with conventional breakwaters like this, the breakwater blocks are piled up directly on top of the rubble laid on the bottom of the water, so when the ground at the bottom of the water is muddy or soft, There is a risk that the embankment body may sink unevenly and be destroyed.

Therefore, the present invention aims to solve these problems and provide a breakwater that prevents uneven settlement.

Means for Solving the Problems In order to solve the above problems, the present invention installs a surface plate on the bottom of the water, forms a plurality of V-shaped grooves on the top surface of this surface plate, and in these grooves, Wave-dissipating pipe-like structures with rectangular surfaces are fitted into each other so as to form a diamond shape when viewed from the end, and these pipe-like structures are stacked in multiple stages.

Effects According to this configuration, all the pipe-like structures are stacked on the surface plate, so
Uneven settlement does not occur for some pipe-like structures. In addition, by using the V-shaped groove formed on the top surface of the surface plate, pipe-like structures with rectangular cross sections were stacked in multiple stages so that they had a rhombus shape when viewed from the end. A strong embankment body will be constructed.

Embodiment FIG. 1 shows a first embodiment of the present invention. Here, 1 is the water bottom, which corresponds to the seabed near the coast, for example, and is made of soft ground such as mud. A plurality of vertical boreholes 2 are formed in the water bottom 1, and a sandpile 4 is constructed by filling the boreholes 2 with sand 3.

A concrete block surface plate 5 is installed at the construction site of the sand pile 4 on the water bottom 1. A plurality of V-shaped grooves 7 are formed on the upper surface 6 of the surface plate 5.
is formed, and a plurality of pipe-like structures 8 having a rectangular cross section that fit into the groove 7 are stacked. FIG. 4 shows a longitudinal section of this pipe-like structure 8.

In FIG. 4, the block 9 is made of concrete and has a rectangular cross section as described above. A cast iron pipe 10 extending along the length of the block 9 is embedded inside the block 9, and a through hole 11 is formed by the cast iron pipe 10. The through hole 11 has a bellmouth-shaped suction port 13 that opens at the outer end surface 12 of the block 9. A constricted portion 14 having a smaller diameter than the suction port 13 is formed over a certain length in a portion of the through hole 11 on the inner side of the bay from the suction port 13 . Further inside the bay than the constricted part 14, a water retarding part 15 having a larger diameter than the constricted part 14 is formed. Further, on the guide side of the water retarding section 15, a constriction section 16 similar to the one on the outside of the bay, and a bellmouth-shaped discharge port 18 that opens at the end surface 17 of the block 9 on the inside of the bay are formed.

As shown in FIG. 1, each pipe-like structure 8 is
It is fitted into the groove 7 of the surface plate 5 so as to form a diamond shape when viewed from the end, and in a similar arrangement, a plurality of objects are arranged vertically and vertically.
They are piled up on the left and right to construct the embankment body 19.

Next, a method of constructing such an embankment body 19 will be explained. First, a bore hole 2 is drilled in a water bottom 1 made of soft ground, and the hole 2 is filled with sand 3 to form a sand pile 4. If this sand pile 4 is left for a while in the formed state, water contained in the soft ground at the water bottom 1 will be released into the water through the sand pile 4. As a result, the ground is naturally consolidated, and the water bottom 1 quickly and stably sinks.

After that, a surface plate 5 is installed at the construction site of the sand pile 4 on the water bottom 1, and a plurality of pipe-like structures 8 are stacked on this surface plate 5, thereby completing the embankment body 19 as shown in the figure.

According to such a configuration, since the pipe-like structures 8 are piled up on the upper surface 6 of the surface plate 5 as a rigid body, even if there are locally weak spots on the water bottom 1, Some pipe-like structures 8
The embankment body 19 will not be destroyed due to uneven settlement. Furthermore, by improving the ground with the sand piles 4 as described above, uneven settlement can be prevented with certainty. In addition, a V-shaped groove 7 was formed on the upper surface of the surface plate 5, and the pipe-like structures 8 were fitted into the grooves 7, and the pipe-like structures 8 were stacked in multiple stages so that the end view was diamond-shaped.
The embankment constructed by this method becomes stronger.

When a water wave advances toward the embankment body 19, this water wave collides with the bay-side end surface 12 of the pipe-like structure 8, and energy is absorbed by this collision and the wave is dissipated. In addition, some of the water waves pass through the inside of the through hole 11, but the cast iron pipe 10 during this passage
collision with the inner surface of the
Wave dissipation is performed by changing the passage cross-sectional area in the retarding section 4, 16 and the water retarding section 15.

FIG. 2 shows a second embodiment of the present invention. In this example, rubble 20 is placed between the surface plate 5 and the water bottom 1.
By laying the structure and distributing the load based on the weight of the surface plate 5 and the pipe-like structure 8, uneven settlement is reliably prevented.

FIG. 3 shows a third embodiment of the present invention, in which the surface plate 5 is simply installed directly on the water bottom 1.

Effects of the invention As mentioned above, according to the invention, a surface plate is installed at the bottom of the water, and pipe-like structures are piled up on top of this surface plate. The entire surface of the surface plate is supported by the bottom of the water, which not only prevents uneven settlement of some pipe-like structures, but also prevents the V-shaped groove formed on the top surface of the surface plate. By using this method, pipe-like structures with rectangular cross sections were stacked in multiple tiers to form a diamond shape when viewed from the end, so that a strong embankment was constructed by these pipe-like structures, and this V-shaped The grooves facilitate the diamond-shaped stacking described above.

[Brief explanation of the drawing]

FIG. 1 is a front view of a breakwater in the first embodiment of the present invention, FIG. 2 is a front view of the breakwater in the second embodiment, and FIG. 3 is a front view of the breakwater in the third embodiment. FIG. 4 is a longitudinal cross-sectional view of the pipe-like structure. 1... Water bottom, 4... Sand pile (means for preventing uneven subsidence), 5... Surface plate, 8... Pipe-shaped structure,
20...Rubbish (measures to prevent uneven settlement).

Claims (1)

[Scope of utility model registration request] A surface plate is installed on the bottom of the water, and multiple V-shaped grooves are formed on the top surface of the surface plate. Inside these grooves, wave-dissipating pipe-like structures with a rectangular cross section are installed in a rhombic shape when viewed from the end. A breakwater is characterized by stacking these pipe-like structures in multiple tiers, each of which is fitted into the other.