JP4873575B2 - Wave-dissipating block and its construction method - Google Patents

Description

  The present invention relates to a wave-dissipating block and its construction method.

Generally, a wave-dissipating block is installed as a bank protection for protecting a riverbank or a coast.
As such a wave-dissipating block, for example, a shaft body portion having a predetermined length and diameter, and the shaft body portion integrally extend in the three radial directions at equal intervals, and have the same length and diameter as the shaft body portion. A wave-dissipating block having a leg portion is known (for example, see Patent Document 1).
In addition, a wave-dissipating block including a block main body in which base end portions of a plurality of leg portions are integrally coupled to each other is known (for example, see Patent Document 2).

  (A) of FIG. 5 is a schematic diagram showing a state where a conventional wave-dissipating block is installed on a riverbank or a coastal slope, and (b) is a figure where the wave-dissipating block is sunk unevenly from the state of (a). It is the schematic which shows a state, (c) is the schematic which shows the state which raised and constructed the conventional wave-dissipating block.

  First, as shown in Fig. 5 (a), the revetment is formed by designing the height required to protect the river bank and the coast as the planned line P, and installing a wave-dissipating block based on it. Is done.

However, some wave-dissipating blocks may sink unevenly or be buried due to external forces such as crustal movements and waves over time.
Then, the planned line P collapses and becomes a subsidence line Q.
As shown in FIG. 5 (b), a structure in which some of the wave-dissipating blocks sunk unevenly to form a subsidence line Q (hereinafter referred to as “subsidence structure”) has sufficient height necessary for revetment. As a result, there is a situation in which the bank cannot be protected on the river bank and the wave cannot be sufficiently absorbed on the beach.

For this reason, conventionally, as shown in FIG. 5 (c), a structure (hereinafter referred to as a “lifting structure”) in which the conventional wave-dissipating block 100 is raised on the sinking structure is used. .
JP-A-6-235210 JP 2006-348572 A

  However, when the conventional wave-dissipating block including the wave-dissipating block described in Patent Document 1 or 2 described above is used to raise the height of the wave-dissipating block, the height of the wave-dissipating block is increased. Since it is not necessarily constant, the structure is unstable with respect to external forces such as wave force and running water.

If it does so, the said raising structure will be inadequate root consolidation on a river bank, and cannot protect a dike fully, and there exists a tendency for sufficient wave extinction not to be possible on a coast.
Moreover, since the raising structure in this case is unstable, the wave-dissipating block itself moves or the further raising of the raising structure is likely to occur.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a wave-dissipating block that can reliably protect riverbanks and coasts, and that does not easily collapse even when raised, and its construction method. To do.

  The inventors of the present invention have intensively studied to solve the above problems, and found that the above problems can be unexpectedly solved by adjusting the length of the legs of the wave-dissipating block, and the present invention has been completed. It came to do.

That is, the present invention is ( 1 ) a wave-dissipating block in which a first-stage wave-dissipating block is installed on the slope, and after the first-phase wave-dissipating block sinks, the second-phase wave-dissipating block is used for raising the construction. The second method comprises a central portion, one long leg portion extending radially from the central portion, and three short leg portions shorter than the length in the longitudinal direction of the long leg portion. A second term extinction block comprising an anti-wave block, a central portion, two long legs extending radially from the central portion, and two short legs shorter than the length of the long legs in the longitudinal direction A second term extinguishing comprising a wave block, a central part, three long legs extending radially from the central part, and one short leg shorter than the length of the long leg in the longitudinal direction There exists in the construction method of the wave-dissipating block which carries out the raising construction by selecting and using at least 2 types among wave blocks .

Since the leg part consists of a long leg part and a short leg part shorter than the length of the longitudinal direction of this long leg part, the gravity center becomes low.
For this reason, the said wave-dissipating block is excellent in stability.

For example, when such a wave-dissipating block is used for raising construction or the like, the short leg part and the long leg part can be appropriately used corresponding to the shallow part and the deep part where the depression of the settlement line Q is shallow, so The height of the block can be made as constant as possible.
In this case, according to the wave-dissipating block, it is stable against external forces such as wave force and running water, and the riverbank and the coast can be reliably protected.
Therefore, the wave-dissipating block is particularly preferably used for raising construction.

Moreover, in the said wave-dissipating block, when a construction surface is seen externally, since the leg part of the said wave-dissipating block does not protrude largely, a landscape is not impaired.
Furthermore, when constructing the wave-dissipating block, the weight of the wave-dissipating block is light, so that the construction heavy machinery can be reduced in size and the cost can be reduced.
Furthermore, the number of short legs can be appropriately selected for the wave-dissipating block in accordance with the height of the raising work and the planned repair state. The wave-dissipating block preferably has a leg portion composed of three long leg portions and one short leg portion.

  In the wave-dissipating block, when the length of the long leg portion in the longitudinal direction is 1, and the length of the short leg portion is 0.2 to 0.8, the concave portion of the subsidence structure after subsidence is filled. easy.

  If the cross section of the leg part is a regular hexagon and the tip has a hexagonal frustum shape, the wave-dissipating block is further prevented from collapsing.

Since the above-mentioned wave-dissipating block can be demolded with a concrete strength of about 5 N / mm ² , the period from concrete placement to demolding may be short, and the rotation of the mold will be fast, so that a large number of blocks can be efficiently produced Can be manufactured. Moreover, the damage of the block at the time of mold removal decreases.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary.
In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.
Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified.
Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

[First Embodiment]
First, a first embodiment of the wave-dissipating block of the present invention will be described.
FIG. 1A is a plan view showing a first embodiment of the wave-dissipating block of the present invention, and FIG. 1B is a front view showing the first embodiment of the wave-dissipating block of the present invention.
As shown in FIGS. 1A and 1B, the wave-dissipating block 10 according to this embodiment includes a center portion 11 and legs 12 extending radially from the center portion 11. That is, in the wave-dissipating block 10, the central portion 11 is continuously integrated with the leg portion 12, and one short leg portion 12 a and three long leg portions 12 b that are the leg portions 12 are equally spaced from each other. Thus, it has the structure extended radially from the center part 11 toward four directions.

Each of the short leg portion 12a and the long leg portion 12b has a regular hexagonal cross section, and the tip A has a hexagonal frustum shape.
For this reason, in the wave-dissipating block 10, the slip of the leg portions 12 is suppressed, and the wave-dissipating blocks are well meshed with each other. Therefore, stability is excellent with respect to external forces such as wave force and running water.
In addition, since the tip A has a hexagonal frustum shape, the leg portion 12 can be inserted between the wave-dissipating blocks 10.
Therefore, even if the wave-dissipating block 10 is used for installation work such as random stacking work, twilling work, spectacles stacking work, parallel product construction, raising work, etc., collapse is unlikely to occur.

In the wave-dissipating block 10, the ratio of the length L (shown in FIG. 1) of the short legs 12a and the long legs 12b in the longitudinal direction is set to 1 when the length of the long legs 12b in the longitudinal direction is 1. From the viewpoint of easy filling of the concave portions of the subsidence structure after subsidence, the length of the short legs 12a is preferably 0.2 to 0.8.
Here, the length L means a distance from the connection surface between the center portion 11 and the leg portion 12 to the end surface of the leg portion 12.

As described above, in the wave-dissipating block 10 according to the present embodiment, the leg portion 12 includes the long leg portion 12b and the short leg portion 12a, so that the center of gravity of the wave-dissipating block 10 itself is lowered.
For this reason, the wave-dissipating block 10 is excellent in stability.

  The wave-dissipating block 10 is preferably used for raising construction. That is, the wave-dissipating block 10 is preferably used in the case where the first-stage installation is performed and after the wave-dissipating block sinks, the raising work is performed.

  More specifically, the wave-dissipating block 10 is, for example, a first-stage wave-dissipating block constructed by first-stage installation such as random stacking construction, twilling construction, spectacles construction, parallel product construction, etc. This is used for further raising the height of the first wave-dissipating block that has been sunk evenly after the sunk by the sag (in this case, a subsidence structure having a sunk line Q).

In this case, the height of the wave-dissipating block of the raised structure can be made as constant as possible with respect to the existing subsidence structure using the conventional wave-dissipating block. It can be stabilized.
Moreover, since the leg part 12 does not protrude largely when the said wave-dissipating block 10 is used for the raising construction etc., a landscape is not impaired.

Next, a method for manufacturing the wave-dissipating block 10 according to this embodiment will be described.
First, a central mold frame in the shape of the central portion 11, a short leg mold frame in the shape of the short leg portion 12a, and a long leg mold frame in the shape of the long leg portion 12b are prepared.
Next, the short leg frame and the long leg mold frame are connected and integrated into the central mold frame, and concrete is poured into the central mold frame.
And the said wave-dissipating block 10 is manufactured by hardening concrete.

At this time, the mold can be removed even when the strength of the wave-dissipating block 10 is removed from the mold by about 5 N / mm ² or less.

  Note that the short leg mold frame and the long leg mold frame can be attached to and detached from the central mold frame, and by changing the short leg mold frame and the long leg mold frame, there are various combinations of legs 12. Blocks can be manufactured.

Next, the construction method of the wave-dissipating block 10 which concerns on this embodiment is demonstrated.
The construction method of the wave-dissipating block 10 according to the present embodiment is that the first-phase wave-dissipating block is set on the slope, and after the first-phase wave-dissipating block sinks, the second-phase wave-dissipating block (wave-dissipating block 10) Raise the construction using the.

  (A) of FIG. 2 is a schematic diagram showing a state where a conventional wave-dissipating block is installed on a riverbank or a coastal slope, and (b) is a case where the wave-dissipating block is sunk unevenly from the state of (a). It is the schematic which shows a state, (c) is the schematic which shows the state which raised and constructed the wave-dissipating block which concerns on this embodiment.

  First, as shown in FIG. 2 (a), the revetment is designed as a plan line P with a height required to protect the river bank and the coast, and based on this, for example, a conventional wave breaker block is used. Formed by mounting.

If the slope of the slope changes over time due to some reason, some wave-dissipating blocks may be unevenly submerged and buried.
Then, as shown in FIG. 2 (b), some of the wave-dissipating blocks sink unevenly to form a sinking structure.
In this subsidence structure, as can be seen from the subsidence line Q, the height required for revetment cannot be obtained, and as a result, the bank cannot protect the embankment, and the coast cannot wave-extinguish. Occurs.

  For this reason, as shown in FIG.5 (c), it correct | amends to the raising structure which carried out raising construction using the wave-dissipating block 10 of this invention on the settlement structure.

In the construction method of the wave-dissipating block 10 according to the present embodiment, the short leg portion 12a and the long leg portion 12b can be appropriately used corresponding to the shallow portion and the deep portion where the depression of the settlement line Q is shallow.
Therefore, in the construction method of the wave-dissipating block 10, collapse is further prevented.

In the construction method of the wave-dissipating block 10, the wave-dissipating block 10 can be constructed up to the initial height necessary for revetment, and the height of the wave-dissipating block 10 is made as constant (equalized) as possible. Is possible. As a result, it is stable against external forces such as wave power and running water, and the riverbank and coast can be reliably protected.
In addition, when the construction surface is viewed from the exterior, the leg portion 12 of the wave-dissipating block 10 does not protrude greatly, so the raised structure using the wave-dissipating block 10 does not impair the landscape.
Furthermore, since the construction method of the said wave-dissipating block uses the wave-dissipating block 10 which uses less concrete quantity than the conventional wave-dissipating block, it can construct at low cost.
Furthermore, since the wave-dissipating block 10 is lightweight, the construction is easy and the construction heavy machinery can be downsized.

In the wave-dissipating block construction method, it is preferable to use a plurality of types of wave-dissipating blocks having different numbers of short legs 12a and long legs 12b as the wave-dissipating block used for the raising work.
In this case, it is possible to reliably install the short leg portion 12a and the long leg portion 12b with respect to the shallow portion and the deep portion where the concave portion of the subsidence line Q is in accordance with the height of the raising construction and the planned repair state. It becomes.
Further, the degree of freedom in selecting the wave-dissipating block to be used is increased in order to fill the concave portion of the subsidence structure.
For this reason, height is more equalized.

[Second Embodiment]
Next, a second embodiment of the wave-dissipating block of the present invention will be described.
FIG. 3A is a plan view showing a second embodiment of the wave-dissipating block of the present invention, and FIG. 3B is a front view showing the second embodiment of the wave-dissipating block of the present invention.
As shown in FIGS. 3A and 3B, the wave-dissipating block 20 according to the present embodiment includes a center portion 21 and leg portions 22 extending radially from the center portion 21. 22 is different from the wave-dissipating block 10 according to the first embodiment in that it includes two short legs 22a and two long legs 22b.
That is, in the wave-dissipating block 20, the central portion 21 is continuously integrated with the leg portion 22, and the two short leg portions 22 a and the two long leg portions 22 b that are the leg portions 22 are equally spaced from each other. Thus, it has a structure extending radially from the central portion 21 in four directions.

Since the wave-dissipating block 20 according to the present embodiment includes two long leg portions 22b and two short leg portions 22a, the center of gravity is further lower than that of the wave-dissipating block 10 according to the first embodiment.
Therefore, the wave-dissipating block 20 is more stable against external forces such as wave force and running water, and can protect the riverbank and the coast more reliably.

[Third Embodiment]
Next, a third embodiment of the wave-dissipating block of the present invention will be described.
FIG. 4A is a plan view showing a third embodiment of the wave-dissipating block of the present invention, and FIG. 4B is a front view showing the third embodiment of the wave-dissipating block of the present invention.
As shown in FIGS. 4A and 4B, the wave-dissipating block 30 according to the present embodiment includes a center portion 31 and leg portions 32 extending radially from the center portion 31. 32 is different from the wave-dissipating block 10 according to the first embodiment in that it includes three short legs 32a and one long leg 32b.
That is, in the wave-dissipating block 30, the center part 31 is continuously integrated with the leg part 32, and the three short leg parts 32a and the one long leg part 32b which are the leg parts 32 are equidistant from each other. As described above, the structure extends radially from the central portion 31 in four directions.

Since the wave-dissipating block 30 according to the present embodiment includes one long leg portion 32b and three short leg portions 32a, the center of gravity is further lower than that of the wave-dissipating block 10 according to the first embodiment.
Therefore, the wave-dissipating block 30 is more stable against external forces such as wave power and running water, and can protect the riverbank and the coast more reliably.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  For example, in the wave-dissipating block 10 according to the first embodiment, the leg portion 12 has a total of four legs, one short leg portion 12a and three long leg portions 12b. If it is provided with a part, it will not be limited to four, but three may be sufficient and five or more are also possible.

Moreover, although the cross section of the short leg part 12a and the long leg part 12b of the wave-dissipating block 10 is a regular hexagon, it may be a circle or an ellipse, or may be a regular polygon such as a regular octagon.
Furthermore, although the tip A has a hexagonal frustum shape, it may be a frustum shape, an elliptic frustum shape, or a regular polygonal frustum shape such as an octagonal frustum shape.

The wave-dissipating block 10 according to the present embodiment can be used in combination with a plurality of types of wave-dissipating blocks 10 having different numbers of short legs as shown in the respective embodiments in not only raising construction but also installation construction. .
Moreover, in the construction method of the wave-dissipating block 10 which concerns on this embodiment, although it has shown by the example which used the conventional wave-dissipating block for the installation of the 1st period, it is also possible to use the wave-dissipating block 10 of this invention. is there.

FIG. 1A is a plan view showing a first embodiment of the wave-dissipating block of the present invention, and FIG. 1B is a front view showing the first embodiment of the wave-dissipating block of the present invention. (A) of FIG. 2 is a schematic diagram showing a state where a conventional wave-dissipating block is installed on a riverbank or a coastal slope, and (b) is a case where the wave-dissipating block is sunk unevenly from the state of (a). It is the schematic which shows a state, (c) is the schematic which shows the state which raised and constructed the wave-dissipating block which concerns on this embodiment. FIG. 3A is a plan view showing a second embodiment of the wave-dissipating block of the present invention, and FIG. 3B is a front view showing the second embodiment of the wave-dissipating block of the present invention. FIG. 4A is a plan view showing a third embodiment of the wave-dissipating block of the present invention, and FIG. 4B is a front view showing the third embodiment of the wave-dissipating block of the present invention. (A) of FIG. 5 is a schematic diagram showing a state where a conventional wave-dissipating block is installed on a riverbank or a coastal slope, and (b) is a figure where the wave-dissipating block is sunk unevenly from the state of (a). It is the schematic which shows a state, (c) is the schematic which shows the state which raised and constructed the conventional wave-dissipating block.

Explanation of symbols

10, 20, 30 ... wave-dissipating block 11, 21, 31 ... center part 12, 22, 32 ... leg part 12a, 22a, 32a ... short leg part 12b, 22b, 32b ... Long legs 100 ... Conventional wave-dissipating block A ... Tip L ... Length P ... Planning line Q ... Subsidence line

Claims (1)

After installing the first phase wave-dissipating block on the slope, after the first phase wave-dissipating block sinks, it is a construction method of the wave-dissipating block in which the second-phase wave-dissipating block is used for the raising construction,
A second-stage wave-dissipating block comprising a central portion , one long leg portion extending radially from the central portion, and three short leg portions shorter than the length in the longitudinal direction of the long leg portion; A second-stage wave-dissipating block comprising: two long legs extending radially from the central portion; and two short legs shorter than the length of the long legs in the longitudinal direction; And at least two of the second-stage wave breaking blocks including three long legs extending radially from the central portion and one short leg shorter than the length of the long legs in the longitudinal direction. A method of constructing a wave-dissipating block, characterized by selecting and using a type for raising .

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