JP2014001524A - Block and undersea structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction technology for an undersea structure suppressing water level rise on a seashore side, reducing wave height, and having an excellent coastal conservation function.SOLUTION: A block 100 comprises: a body part 10 having an equilateral triangle shape in a planar view; an opening 11 provided in a region including the center of gravity of the body part 10; and three support parts 12 protrusively formed at apexes of the bottom face of the body part 10, respectively. On a submerged breakwater 200 formed in the sea near a coast, a plurality of blocks 100 are arranged along an extension direction L of the submerged breakwater 200 at predetermined intervals in the state that the body part 10 represents an equilateral triangle shape in a planar view and one of peripheral edges 13 of the body part 10 is parallel to the extension direction L of the submerged breakwater 200, and an undersea structure 300 is formed by housing crushed stones R in the openings 11 of the blocks 100.

Description

  The present invention relates to an undersea structure constructed in the sea near the coast for the preservation of the coast and a block used for the structure.

  A wide variety of proposals have been made for blocks arranged in the sea for the purpose of coastal conservation or structures built in the sea, but the techniques related to the present application are described in Patent Documents 1 to 6. There is something.

JP 2007-16397 A JP 2006-125102 A JP 2006-90011 A JP 2006-70626 A Japanese Patent Laid-Open No. 9-59958 JP-A-8-3965

  The blocks or underwater structures described in Patent Documents 1 to 6 have excellent functions such as a wave extinguishing function, but the function to suppress the rise of the water level on the coast and the function to reduce the wave height. There is a shortage.

  In addition, since the blocks described in Patent Documents 1 to 6 have a complicated structure, not only a great deal of labor is required for manufacturing, but also the transportation and installation work to the construction site is troublesome. There is also a lack of stability during and after installation.

  Therefore, the problem to be solved by the present invention is to provide a construction technique of an underwater structure excellent in coastal conservation function while suppressing the rise of the water level on the coast side and reducing the wave height.

  The block of the present invention is a block that is placed on a submerged dike formed in the sea near the coast, and has a main body that has a triangular shape in plan view when placed on the submerged dike. It is characterized by.

  Here, it is desirable that the planar view shape of the main body is an equilateral triangle.

  Moreover, it is desirable to provide a plurality of support portions that are in contact with the submerged dike in the main body portion.

  Furthermore, it is desirable to provide the support portion at three places on the lower surface of the main body portion.

  On the other hand, a through hole may be provided in the main body.

  Next, in the underwater structure of the present invention, on the submerged dike formed in the sea near the coast, the main body portion has a triangular shape in plan view, and one of the peripheral edges of the main body portion is the above-described block. It is characterized in that it is formed by placing a plurality of pieces along the extension direction of the submerged dike in a posture parallel to the extension direction of the submerged dike.

  In the undersea structure, there is no limitation on the block arrangement form such as the arrangement interval of the blocks placed on the submerged dike and the minimum gap between the adjacent blocks. It can be determined appropriately according to topography, geology, wave conditions or other construction conditions.

  According to the present invention, it is possible to provide a construction technique of an underwater structure that suppresses a rise in water level on the coast side, reduces the wave height, and has an excellent coastal conservation function.

It is a perspective view which shows the block which is embodiment of this invention. It is the front view seen from the arrow X direction in FIG. It is the side view seen from the arrow line Y direction in FIG. It is the bottom view seen from the arrow Z direction in FIG. It is a partially-omission perspective sectional view showing an underwater structure which is an embodiment of the present invention. It is explanatory drawing which shows typically the function of the undersea structure shown in FIG. It is a top view which shows the arrangement | positioning state of the block in the undersea structure shown in FIG. It is a perspective view which shows the block which is other embodiment of this invention. It is a perspective view which shows the block which is other embodiment of this invention. It is a perspective view which shows the block which is other embodiment of this invention.

  Based on FIGS. 1-5, the block 100 which is embodiment of this invention is demonstrated. The block 100 shown in FIG. 1 is used by being placed on a submerged dike 200 formed in the sea near the coast, as shown in FIG. The main body 10 has a triangular shape in plan view. Specifically, as shown in FIGS. 1 to 4, the block 100 is opened in a region including the main body 10 in which the plan view shape viewed from the direction of the arrow A is an equilateral triangle and the center of gravity G of the main body 10. And the three support portions 12 projecting from the apex portion of an equilateral triangle on one surface of the main body portion 10 (the bottom surface when viewed from the direction of the arrow Z).

  As shown in FIGS. 1 and 4, the planar shape of the opening 11 is an equilateral triangle that is similar to the planar shape of the main body 10, and the opening 11 has the same phase as the main body 10. It has been established. As shown in FIG. 4, all of the three support portions 12 have a regular triangular prism shape, and the cross-sectional shape of the support portion 12 and the shape of the main body portion 10 in plan view are arranged in the same phase. In addition, the shape of the opening part 11 and the support part 12 is not limited to the shape shown in FIGS.

  Next, based on FIGS. 5-7, the underwater structure 300 constructed | assembled using the some block 100 is demonstrated. As shown in FIG. 5, the underwater structure 300 includes a main body 10 in plan view of the block 100 shown in FIGS. 1 to 4 on a submerged dike 200 formed in the sea S near a coast (not shown). By placing a plurality of regular triangles along the extension direction L of the submerged dike 200 in a posture in which the shape forms an equilateral triangle and one of the peripheral edges 13 of the main body 10 is parallel to the extension direction L of the submerged dike 200 Is formed. In FIG. 5, for convenience of explanation, a state in which two blocks 100 are placed is shown. However, the number of blocks 100 corresponding to the length of the submerged dike 200 is not limited to this. Is done.

  The arrangement interval K (see FIG. 7) of the blocks 100 in the underwater structure 300 is not particularly limited, but in the present embodiment, as shown in FIG. It is smaller than one length of the peripheral edge 13 of the part 10. Note that the arrangement interval (arrangement form) of the blocks 100 shown in FIG. 7 is an example, and the arrangement intervals of a plurality of blocks 100 placed on the submerged dike 200, the minimum gaps between adjacent blocks 100, and the like. 7 is not limited to the arrangement shown in FIG. 7, and can be appropriately determined according to the topography, geology, wave condition, climate, and other various construction conditions in the vicinity of the coast where the underwater structure 300 is constructed.

  As shown in FIGS. 5 and 6, a plurality of crushed stones R are accommodated in the openings 11 of the block 100 placed on the submerged dike 200. In addition, since the block 100 is grounded to the submerged dike 200 by the three support portions 12 projecting on the bottom surface side, even if there is some unevenness (unevenness) or a gradient on the upper surface of the submerged dike 200, the block 100 is loose. It is kept stable without sticking. As shown in FIG. 6, in the present embodiment, the submerged dike 200 is formed by stacking a number of wave-dissipating blocks 15, but the present invention is not limited to this.

  As shown in FIGS. 5 and 6, after the construction of the underwater structure 300, the waves W rushing from the offshore toward the coast are subjected to a wave height reducing action by raising the plurality of blocks 100 constituting the underwater structure 300. Therefore, the wave height is greatly reduced. 6 and 7, one of the peripheral edges 13 of the plurality of blocks 100 is arranged along the extension direction L of the submerged dike 200 in a state parallel to the extension direction L of the submerged dike 200. As a result, there is a difference in the resistance received from the block 100 between the shore direction and the offshore phase of the wave W, and an offshore average current is generated. Therefore, an increase in the water level on the coast side from the underwater structure 300 can be suppressed. . Furthermore, a calm sea area can be secured behind the underwater structure 300 (coast side) even during a stormy season, which is effective for coastal conservation.

  Next, blocks 400, 500, and 600, which are other embodiments of the present invention, will be described with reference to FIGS. A block 400 shown in FIG. 8 has a structure in which the support portion 12 and the opening 11 in the block 100 shown in FIG. 1 are omitted. A block 500 shown in FIG. 9 has a structure in which the support portion 12 in the block 100 shown in FIG. A block 600 shown in FIG. 10 has a structure in which the opening 11 in the block 100 shown in FIG.

  By using these blocks 400, 500, and 600 to construct an underwater structure as shown in FIG. 5, it is possible to suppress the rise of the water level on the coast, reduce the wave height, and obtain the effect of preserving the coast. Can do.

  The block 100, the undersea structure 300, and the blocks 400, 500, 600 and the like described with reference to FIGS. 1 to 10 exemplify embodiments of the present invention, and the block and the underwater structure according to the present invention. Is not limited to the embodiment described above.

  The construction technology for undersea structures according to the present invention can be widely used in the field of civil engineering construction industry as one of the coastal conservation technologies.

DESCRIPTION OF SYMBOLS 10 Main body part 11 Opening part 12 Support part 13 Perimeter 15 Wave break block 100,400,500,600 block 200 Underwater structure 300 Underwater structure G Center of gravity K Arrangement distance L Extension direction M Minimum gap R Crushed stone S Sea W Wave

Claims (6)

  A block that is placed on a submerged dike formed in the sea near the coast, and that has a main body portion that has a triangular shape in plan view when placed on the submerged dike.   The block according to claim 1, wherein the shape of the main body in plan view is an equilateral triangle.   The block according to claim 1, wherein a plurality of support portions that contact the submerged dam are provided on the main body portion.   The block according to claim 3, wherein the support portion is provided at three positions on the lower surface of the main body portion.   The block in any one of Claims 1-4 which provided the through-hole in the said main-body part.   The block according to any one of claims 1 to 5, wherein the main body portion has a triangular shape in a plan view, and one of the peripheral edges of the main body portion is the submerged dike. A submarine structure formed by mounting a plurality of the submerged dike along the extension direction in a posture parallel to the extension direction of the submerged dike.

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