JPH044036Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to so-called mats such as asphalt for underwater structures, in other words, to prevent caissons from slipping, and to vacuum cut materials.

[Problems to be solved by conventional techniques and ideas]

Conventionally, when constructing an underwater structure such as a breakwater where large external forces act on the structure, asphalt pine is laid on the underwater foundation mound and structures such as caissons are placed on top of it as a measure to prevent the underwater structure from sliding. There is.

Therefore, when laying asphalt pine on an underwater mound, the pine 1
Since it has a flat structure, it adapts to the unevenness of the mound 2 and is laid in an uneven pattern.

When a structure 3 such as a caisson is placed on top of the mat 1 laid in an uneven pattern, a locally confined space 4 is created between the caisson 3 and the mat 1 because the caisson has a rigid structure. The water in this space 4 acts as a force to push down the mat 1 as shown by the arrow. Therefore, the caisson 3 receives a water pressure in the upward direction of the arrow as a reaction force, and locally receives a pushing force, that is, a force that tries to make the caisson 3 float.

Furthermore, although it is local, the existence of such a space 4 between the caisson 3 and the mat 1 reduces the anti-slip force (increase in the coefficient of friction) of the caisson where the mat 1 is installed. This is undesirable as it causes a decrease in the temperature.

Furthermore, if an underwater structure is directly sunk on soft ground, the underwater structure will come into contact with the underwater structure, creating a vacuum effect. Since the underwater structure is stuck tightly and cannot be lifted, it becomes impossible to remove the underwater structure that is no longer needed, and a large amount of cost is required to remove it, which is undesirable.

The present invention was devised to solve such problems.

[Means for solving problems]

The gist of this invention is that a large number of drainage holes are provided in part or all of a plastic mat made of asphalt, rubber, or synthetic resin, on which structures such as caissons are placed. The caisson's sliding prevention feature is characterized by the fact that it is made of vacuum cut material.

The purpose of the water drainage holes can be achieved by forming them in advance during the mat manufacturing process.

〔Example〕

As shown in FIG. 2, drainage holes 5 are provided in a plastic mat 1 made of asphalt, rubber, or synthetic resin, penetrating vertically.

As a result, the water confined in the space 4 shown in FIG. 1 is communicated to the outside through the hole 5, so that the water pressure in the space 4 is removed and a hydrostatic pressure distribution can be achieved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the mechanism by which a pine installed under a caisson receives water pressure, and Fig. 2 A, B, and C are a plan view, a cross-sectional view, and a longitudinal sectional view of the pine according to the embodiment of the present invention. It is. 1...Matsu, 2...Mound, 3...Caisson, 4...Space, 5...Drainage hole.

Claims (1)

[Scope of utility model registration request] Prevention of slipping of a caisson, which is characterized by having a large number of holes for draining water in part or all of a plastic mat made of asphalt, rubber, or synthetic resin, on which a structure such as a caisson is placed. , Bakyum cut wood.