JP7209290B2 - Revetment structure and bank protection construction method - Google Patents

Description

The present invention relates to a bank protection structure and a bank protection construction method.

In recent years, the amount of industrial waste and general waste discharged has increased rapidly. On the other hand, a method is adopted in which the waste is temporarily incinerated to reduce the amount of final disposal such as residues and incombustibles. On the other hand, it is expected that the final disposal amount (landfill amount) will increase more and more in the future, and it is difficult to find a disposal site on land to meet this increase. Therefore, there is a growing trend to construct sea surface disposal sites in coastal waters in the future.

Such a sea surface disposal site has a configuration in which a controlled seawall is constructed in a predetermined sea area and landfilled in an area surrounded by the seawall or in an area surrounded by the coast and the seawall. Such a controlled revetment has, for example, a structure in which a groove is provided on the upper surface of the impermeable foundation, a revetment structure is arranged at the bottom of the groove, and an impermeable layer is arranged between the side wall of the groove and the revetment structure. (See, for example, Patent Literature 1 and Patent Literature 2, etc.).

Japanese Patent No. 5099709 Japanese Patent No. 4293435

In the configurations of Patent Documents 1 and 2, horizontal movement is allowed within a range that satisfies the required performance regarding the stability of the bank protection structure. Therefore, the material constituting the impermeable layer is limited to a deformation-following impervious material such as asphalt mixture that deforms following the horizontal movement of the revetment structure.

The present invention has been made in view of the above, and a revetment that can ensure stable imperviousness while expanding the range of material selection for the impermeable layer by restricting the horizontal movement of the embankment structure. It aims at providing a structure and a bank protection construction method.

A seawall structure according to an aspect of the present invention is provided between a water-impervious foundation on the seabed in which a groove having a bottom along a horizontal plane and a side wall perpendicular to the horizontal is formed on the upper surface, and a side wall of the groove at the bottom of the groove. an impermeable layer arranged to fill the gap between the revetment structure and the side wall of the trench; and the revetment structure and the side wall of the trench. It has a load transmission member disposed so as to fill the gap and capable of transmitting a horizontal force from the revetment structure to the side wall as a shear force, and is vertically seated when the horizontal force is transmitted to the side wall. and a load transfer layer with the vertical thickness set so as not to yield.

In this configuration, the horizontal force from the revetment structure is transmitted to the side wall as a shear force without buckling of the load transmission layer, so the horizontal movement of the revetment structure can be restricted. By restricting the horizontal movement of the revetment structure in this way, the material of the impermeable layer is not limited to the deformation-following impermeable material, so the range of material choices for the impermeable layer can be expanded. In addition, the impermeable layer using the selected material can ensure stable impermeability.

Also, the load transfer layer may be arranged in a plurality of layers in the vertical direction.

Therefore, since the horizontal force from the revetment structure is dispersed in the vertical direction, it is possible to suppress the concentration of the shear force on a portion of the side wall.

Further, the impermeable layer and the load transfer layer may be formed as the same layer.

Therefore, the impermeable layer and the load transfer layer can be easily formed.

Further, the impermeable layer may be formed using a non-deformation-following impermeable material.

Therefore, by using a non-deforming impermeable material such as a concrete impermeable material or a soil impermeable material for the impermeable layer, construction can be performed at low cost and in a short construction period.

Also, the side wall may be fixed to the impermeable base by an anchor.

Therefore, the side wall can reliably receive the shearing force from the load transmission member.

Further, the groove may have a coating layer covering irregularities formed on the bottom.

Therefore, since the permissible bearing capacity (permissible toe pressure) in the impermeable foundation is increased, the bank protection structure can be made thinner. Therefore, the revetment structure can be made compact. Moreover, since the frictional force between the revetment structure and the covering layer can be increased, it is possible to suppress the horizontal movement of the revetment structure.

In addition, the coating layer is a layer made of underwater concrete, a basic rubble mound using rubble, and the voids between the rubble used in the rubble mound are filled with underwater concrete material, asphalt mixture material or soil material. A filled hybrid foundation mound.

Therefore, by adopting any one of submerged concrete, rubble mound, and hybrid foundation mound as the covering layer, it is possible to make the revetment structure more compact and to suppress the horizontal movement of the revetment structure.

A bank protection construction method according to an aspect of the present invention includes the steps of forming a groove having a bottom along a horizontal plane and side walls perpendicular to the horizontal plane on the upper surface of an impermeable foundation on the seabed; A step of arranging a revetment structure with a gap between them, a step of arranging an impermeable layer so as to fill the gap between the revetment structure and the side wall of the trench, and a horizontal line from the revetment structure a load transmission layer having a load transmission member capable of transmitting a force to the side wall and having a thickness in the vertical direction so as not to buckle vertically when the horizontal force is transmitted to the side wall; arranging so as to fill the gap between the bank protection structure and the side wall of the trench.

In this configuration, the horizontal force from the revetment structure is transmitted to the side wall as a shear force without buckling of the load transmission layer, so the horizontal movement of the revetment structure can be restricted. By restricting the horizontal movement of the revetment structure in this way, the material for the impermeable layer is not limited to the material that can follow the horizontal movement of the revetment structure, so it is possible to expand the selection of materials for the impermeable layer. can. In addition, the impermeable layer using the selected material can ensure stable impermeability.

ADVANTAGE OF THE INVENTION According to this invention, the horizontal movement of a bank protection structure can be suppressed and the bank protection structure and bank protection construction method which can ensure stable imperviousness can be provided.

FIG. 1 is a diagram showing an example of a bank protection structure according to this embodiment. FIG. 2 is a flow chart showing an example of a bank protection construction method according to the present embodiment. FIG. 3 is a diagram showing another example of the bank protection structure. FIG. 4 is a diagram showing another example of the bank protection structure. FIG. 5 is a diagram showing another example of the bank protection structure. FIG. 6 is a diagram showing another example of the bank protection structure. FIG. 7 is a diagram showing another example of the bank protection structure. FIG. 8 is a diagram showing another example of the bank protection structure. FIG. 9 is a diagram showing another example of the bank protection structure. FIG. 10 is a diagram showing another example of the bank protection structure. FIG. 11 is a diagram showing another example of the bank protection structure. FIG. 12 is a diagram showing another example of the bank protection structure.

Hereinafter, embodiments of a bank protection structure and a bank protection construction method according to the present invention will be described based on the drawings. In addition, this invention is not limited by this embodiment. In addition, components in the following embodiments include components that can be easily replaced by those skilled in the art, or components that are substantially the same. Moreover, each of the following configurations can be combined as appropriate.

FIG. 1 is a diagram showing an example of a bank protection structure according to this embodiment. The revetment structure 100 shown in FIG. 1 is applicable to revetment structures and breakwater structures such as controlled revetments and stable reclaimed revetments. The bank protection structure 100 includes a water impermeable foundation 10 , a bank protection structure 20 , a water impermeable layer 30 , and a load transfer layer 40 . In this embodiment, the seawall structure 100 will be described by taking as an example a case where the seawall structure 100 is, for example, a managed seawall that constitutes a sea surface disposal site for waste. Therefore, the revetment structure 100 is provided so as to surround a predetermined landfill area, extending along the outer periphery of the landfill area. Hereinafter, in each figure showing the seawall structure, the left side shows the outside of the sea surface disposal site (sea area side), and the right side shows the inside of the sea surface disposal site (landfill area side).

The impermeable base 10 is, for example, a impermeable base in which the soft ground G of the seabed is improved by a CDM (Cement Deep Mixing) method or the like. The impervious base 10 is not limited to the improved ground, and may be, for example, a bedrock portion of the seabed. In this case, the bedrock part is the impermeable base having the impermeable effect necessary to prevent seepage of retained water and the like. A groove 11 is formed in the upper portion of the impermeable base 10 . The groove portion 11 is formed along the longitudinal direction in which the bank protection structure 100 extends. The groove 11 has a bottom 12 and sidewalls 13 . The bottom 12 is formed along a horizontal plane. A coating layer 14 is formed on the bottom portion 12 to cover the unevenness of the bottom portion 12 . The flatness of the bottom portion 12 is improved by the coating layer 14 . As the coating layer 14, underwater concrete or the like can be used, but other materials may be used. The side walls 13 are formed at both ends of the revetment structure 100 in the width direction perpendicular to the longitudinal direction. The sidewalls 13 are formed perpendicular or nearly perpendicular to the horizontal plane.

The revetment structure 20 is arranged on the bottom 12 of the trench 11, that is, on the upper surface of the covering layer 14 in this embodiment. Examples of the bank protection structure 20 include caissons, cells, and L-shaped blocks. A plurality of bank protection structures 20 are arranged in a row in the longitudinal direction of the bank protection structure 100 . The revetment structures 20 adjacent to each other in the longitudinal direction of the revetment structure 100 are connected by, for example, a joint structure (not shown). Each revetment structure 20 is arranged with a gap between the side walls 13 at both ends in the width direction.

The impermeable layer 30 is arranged so as to fill the gap between the bank protection structure 20 and the side wall 13 . The impermeable layer 30 uses, for example, a deformation-following impermeable material such as an asphalt mixture, but is not limited thereto, and a non-deformation-following impermeable material such as a concrete-based material or a soil-based material is used. good too. In the present embodiment, the impermeable layer 30 is arranged above the load transmission layer 40, which will be described later, but is not limited to this.

The load transfer layer 40 is arranged so as to fill the gap between the bank protection structure 20 and the side wall 13 . The load transmission layer 40 has a load transmission member capable of transmitting horizontal force from the revetment structure 20 to the side walls 13 . The horizontal force in this embodiment is a force having a component in the width direction of the bank protection structure 100 among the forces from the bank protection structure 20 . That is, the horizontal force includes a force directed from the seawall structure 20 toward the sea area and a force directed from the seawall structure 20 toward the landfill area. As the load transfer material, underwater concrete is used, for example, but it is not limited to this, and other materials may be used. In the present embodiment, the load transmission layer 40 is directly provided on the coating layer 14, for example, but is not limited to this, and may be arranged with another layer sandwiched between the coating layer 14 and the load transmission layer 40.

The load transfer layer 40 transfers horizontal forces from the revetment structure 20 to the side walls 13 . In this case, the load transmission layer 40 transmits the horizontal force from the bank protection structure 20 to the side wall 13 as a shear force on the side wall 13 . The sidewalls 13 support shear forces from this load transfer layer 40 . That is, the side wall 13 receives the horizontal force from the bank protection structure 20 as a shear force from the load transmission layer 40 and supports the horizontal force from the bank protection structure 20 by supporting the shear force.

The load transmission layer 40 has a vertical thickness t so as not to buckle in the vertical direction when transmitting the horizontal force from the revetment structure 20 to the side wall 13 . The thickness t of the load transfer layer 40 can be set to be larger than a predetermined threshold calculated using, for example, Euler's formula or Tetmeyer's formula. Since the thickness t is set so that the load transmission layer 40 does not buckle in the vertical direction when horizontal force is transmitted, the deformation of the impermeable layer 30 is suppressed. Note that the thickness t may be the same or different between the load transfer layer 40 on the sea side of the seawall structure 20 and the load transfer layer 40 on the landfill area side.

Next, a bank protection construction method for building the bank protection structure 100 configured as described above will be described. FIG. 2 is a flow chart showing an example of a bank protection construction method according to the present embodiment. As shown in FIG. 2, the bank protection construction method includes a groove formation step (step S10), a bank protection structure placement step (step S20), an impermeable layer placement step (step S30), and a load transmission layer placement step (step S40).

In the groove forming step S10, the groove 11 having the bottom 12 along the horizontal plane and the side walls 13 perpendicular to the horizontal plane is formed on the upper surface of the waterproof substrate 10 . In this embodiment, in the groove forming step S10, after the groove 11 is formed in the impervious substrate 10, the coating layer 14 is formed so as to cover the unevenness of the bottom 12 of the groove 11. FIG.

In the bank protection structure arranging step S<b>20 , the bank protection structure 20 is arranged on the bottom 12 of the groove 11 with a gap between it and the sidewall 13 of the groove 11 . In the bank protection structure arranging step S<b>20 , the bank protection structure 20 is arranged on the upper surface of the coating layer 14 so as to be spaced from the side walls 13 on both sides in the width direction of the bank protection structure 100 .

In the impermeable layer arranging step S<b>30 , the impermeable layer 30 is arranged so as to fill the gap between the bank protection structure 20 and the side wall 13 of the groove portion 11 . In the present embodiment, since the impermeable layer 30 is disposed above the load transmission layer 40, the impermeable layer disposing step S30 is performed after performing the load transmitting layer disposing step S40, which will be described later. In this manner, depending on the positional relationship between the impermeable layer 30 and the load transfer layer 40, the order of the impermeable layer placement step S30 and the load transfer layer placement step S40 may be reversed or alternated, or at least one of them may be changed. You can do it repeatedly.

The load transmission layer placement step S40 includes a load transmission member capable of transmitting a horizontal force from the revetment structure 20 to the side wall 13, and is vertically bent so as not to vertically buckle when transmitting the horizontal force to the side wall 13. A load transmission layer 40 having a thickness t of 1 is arranged so as to fill the gap between the revetment structure 20 and the side wall 13 of the trench 11 .

As described above, the seawall structure 100 according to the present embodiment includes a seabed impervious base 10 having a bottom 12 along the horizontal plane and a groove 11 having a side wall 13 perpendicular to the horizontal plane formed on the upper surface, and the groove 11 A revetment structure 20 arranged on the bottom 12 with a gap between it and the side wall 13 of the groove 11, and a water impermeable structure arranged so as to fill the gap between the revetment structure 20 and the side wall 13 of the groove 11. It has a layer 30 and a load transmission member arranged to fill the gap between the revetment structure 20 and the side wall 13 of the groove 11 and capable of transmitting the horizontal force from the revetment structure 20 to the side wall 13 as a shear force. , a load transfer layer 40 having a vertical thickness t such that it does not buckle vertically when transferring horizontal forces to the sidewalls 13 .

In addition, the bank protection construction method according to the present embodiment includes a step of forming a groove 11 having a bottom 12 along a horizontal plane and a side wall 13 perpendicular to the horizontal on the upper surface of the impermeable foundation 10 on the seabed; a step of arranging a bank protection structure 20 with a gap between it and the side wall 13 of the groove 11; and having a load transfer member capable of transferring horizontal forces from the revetment structure 20 to the sidewalls 13, and having a vertical thickness t so as not to vertically buckle when transferring horizontal forces to the sidewalls 13. is set so as to fill the gap between the bank protection structure 20 and the side wall 13 of the trench 11 .

In this configuration, the horizontal force from the revetment structure 20 is transmitted to the side wall 13 as a shear force without the load transmission layer 40 buckling, so the horizontal movement of the revetment structure 20 can be restricted. By restricting the horizontal movement of the revetment structure 20 in this way, the material of the impermeable layer 30 is not limited to the deformation-following impermeable material, so the range of material choices for the impermeable layer 30 can be expanded. Moreover, the impermeable layer 30 using the selected material can ensure stable impermeability.

In the bank protection structure 100 according to the present embodiment, the groove portion 11 has a coating layer 14 that covers irregularities formed on the bottom portion 12 . Therefore, since the permissible bearing force (permissible toe pressure) in the impervious base 10 is increased, the revetment structure 20 can be made thinner. Therefore, the revetment structure 20 can be made compact. Moreover, since the frictional force between the revetment structure 20 and the coating layer 14 of the bottom part 12 can be increased, it is possible to suppress the revetment structure 20 from moving in the horizontal direction.

The technical scope of the present invention is not limited to the above embodiments, and modifications can be made as appropriate without departing from the scope of the present invention. For example, in the above-described embodiment, a configuration in which one impermeable layer 30 and one load transmission layer 40 are provided has been described as an example, but the present invention is not limited to this.

FIG. 3 is a diagram showing another example of the bank protection structure. A bank protection structure 100A shown in FIG. different from 100. By providing a plurality of impermeable layers 30 in this manner, more stable impermeability is ensured.

FIG. 4 is a diagram showing another example of the bank protection structure. The revetment structure 100B shown in FIG. 4 is provided with a plurality of load transmission layers 40 (for example, two layers), and is arranged with the impermeable layer 30 sandwiched in the vertical direction. different from 100. In this case, the vertical thickness of each load transfer layer 40 is set so that it does not buckle vertically when transferring horizontal forces to the sidewalls 13 . In this case, the total thickness of the two load transfer layers 40 may be set to be greater than a predetermined threshold calculated using, for example, Euler's formula or Tetmeyer's formula. By arranging a plurality of load transfer layers 40 in the vertical direction in this manner, the horizontal force from the bank protection structure 20 is dispersed in the vertical direction. Therefore, it is possible to suppress the concentration of the shearing force on a portion of the side wall 13 .

FIG. 5 is a diagram showing another example of the bank protection structure. The bank protection structure 100C shown in FIG. 5 is provided with a plurality of layers (for example, two layers) of the impermeable layer 30 and the load transmission layer 40, which are arranged alternately in the vertical direction. is different from Also in this case, the total thickness of the two load transfer layers 40 may be set to be larger than a predetermined threshold calculated using, for example, Euler's formula or Tetmeyer's formula. By alternately arranging a plurality of impermeable layers 30 and load transfer layers 40 in the vertical direction in this manner, more stable imperviousness is ensured, and concentration of shear force on a portion of the side wall 13 can be suppressed.

In the above-described embodiment, a configuration in which the impermeable layer 30 and the load transfer layer 40 are arranged symmetrically on the sea area side and the landfill area side with respect to the revetment structure 20 has been described as an example, but it is not limited to this. . FIG. 6 is a diagram showing another example of the bank protection structure. In the seawall structure 100D shown in FIG. 6, the sea area side and the landfill area side of the seawall structure 20 are asymmetrical in number and arrangement of the impermeable layers 30 and the load transfer layers 40 . That is, on the sea area side, one impermeable layer 30 is arranged, two load transfer layers 40 are arranged, and the impermeable layer 30 is arranged between the two load transfer layers 40 in the vertical direction. . On the other hand, on the landfill area side, one load transfer layer 40 is arranged, two impermeable layers 30 are arranged, and the load transfer layer 40 is arranged between the two impermeable layers 30 in the vertical direction. be. In this case, on the sea area side, the total thickness of the two load transfer layers 40 may be set to be greater than a predetermined threshold calculated using, for example, Euler's formula or Tetmeyer's formula. Also, on the landfill area side, the thickness of one layer of the load transfer layer 40 may be set to be larger than a predetermined threshold calculated using, for example, Euler's formula or Tetmeyer's formula. Thus, even if the number and arrangement of the impermeable layers 30 and the load transfer layers 40 are asymmetrical on the sea area side and the landfill area side with respect to the revetment structure 20, stable imperviousness is ensured, and the side wall 13 It is possible to suppress the concentration of shear force on a part of

In the above embodiment, the configuration in which the impermeable layer 30 and the load transmission layer 40 are provided as separate layers was described as an example, but the present invention is not limited to this. FIG. 7 is a diagram showing another example of the bank protection structure. In the bank protection structure 100E shown in FIG. The impermeable/load-transmitting layer 50 has a impermeable material 31 that constitutes the impermeable layer 30 and a load-transmitting material 41 that constitutes the load-transmitting layer 40 . As the impermeable material 31, for example, a concrete impermeable material such as prepacked concrete is used. As the load transmission member 41, for example, a plurality of stones or the like are used. In the impermeable/load-transmitting layer 50 , the impermeable material 31 is arranged so as to fill the gaps between the stone materials forming the load-transmitting material 41 .

Moreover, FIG. 8 is a figure which shows the other example of a bank protection structure. In the bank protection structure 100F shown in FIG. In the impermeable/load-transmitting layer 60, the impermeable material forming the impermeable layer 30 and the load-transmitting material forming the load-transmitting layer 40 are formed using a common soil material.

In this way, since the impermeable layer 30 and the load transfer layer 40 are formed as one impermeable/load transfer layer 50, 60, the impermeable material and the load transfer material are selected from a wide range of materials, and the impermeable layer 30 And the load transmission layer 40 can be easily formed.

In the above embodiment, the case where the bottom 12 and the side walls 13 are formed by digging the groove 11 in the upper surface of the impervious base 10 has been described as an example, but the present invention is not limited to this. FIG. 9 is a diagram showing another example of the bank protection structure. A bank protection structure 100G shown in FIG. It is the structure in which the groove part 11G was formed by fixing to. In this configuration, the portion of the side wall member 15 facing the bank protection structure 20 constitutes the side wall 13G. A water shield layer 30 and a load transfer layer 40 are arranged between the bank protection structure 20 and the side wall 13G. Also, in the example shown in FIG. 9, the load transfer layer 40 is fixed to the cover layer 14G by the anchors 16. As shown in FIG. In this configuration, the side wall member 15 and the load transmission layer 40 are fixed to the cover layer 14G by the anchors 16, so that the shear force from the load transmission layer 40 can be reliably received by the side wall 13G. In addition, the anchor 16 may be arranged on either one of the side wall member 15 and the load transmission layer 40 .

In the above embodiment, the case where the covering layer 14 made of underwater concrete is arranged on the bottom 12 of the groove 11 of the impermeable base 10 has been described as an example, but the present invention is not limited to this. FIG. 10 is a diagram showing another example of the bank protection structure. The revetment structure 100H shown in FIG. 10 has a structure in which a coating layer 17 made of a foundation riprap mound is arranged on the bottom part 12, and a revetment structure 20, an impervious layer 30, and a load transmission layer 40 are arranged on the covering layer 17. be. In this manner, even in the configuration using the coating layer 17 made of the foundation rubble mound, the impermeable layer 30 and the load transfer layer 40 can be arranged. In addition, water leakage through the covering layer 17 may be suppressed by placing a waterproof sheet on the upper surface of the covering layer 17 made of the foundation rubble mound. The coating layer may be composed of, for example, a hybrid foundation mound, in addition to the construction of the underwater concrete and the foundation rubble mound. The hybrid foundation mound is constructed by filling the gaps between the rubble stones used in the foundation rubble mound with an underwater concrete-based material, an asphalt mixture-based material, or a soil-based material.

In the above-described embodiment, the configuration in which the load transmission layers 40 are arranged on both sides of the revetment structure 20 on the sea area side and the landfill area side has been described as an example, but the present invention is not limited to this. FIG. 11 is a diagram showing another example of the bank protection structure. The revetment structure 100I shown in FIG. 11 has a configuration in which the load transfer layer 40 and the impermeable layer 30 are arranged only on either the sea area side or the landfill area side of the seawall structure 20 (for example, the sea area side). In this case, on the landfill area side of the revetment structure 20, only the impermeable layer 70 is arranged and the load transfer layer 40 is not arranged. In this way, when the load transfer layer 40 is arranged only on either the sea area side or the landfill area side with respect to the bank protection structure 20, the bank protection structure 20 is directed toward the side where the load transfer layer 40 is arranged. horizontal force can be transmitted to the sidewall 13 via the load transmission layer 40 .

In the above-described embodiment, a configuration in which the impermeable foundations 10 arranged on both the sea area side and the reclamation area side of the revetment structure 20 have the same or substantially the same height has been described as an example, but the present invention is not limited to this. FIG. 12 is a diagram showing another example of the bank protection structure. In the seawall structure 100J shown in FIG. 12, the height of the impermeable foundation 10 on one of the sea area side and the landfill area side of the seawall structure 20 (for example, the sea area side) is higher than the other (for example, the landfill area side). configuration. In this way, even if the height of the impermeable base 10 on one of the sea area side and the landfill area side of the revetment structure 20 is higher than the other, stable imperviousness is ensured.

10, 10G Impermeable foundation 11, 11G Groove 12 Bottom 13, 13G Side wall 14, 14G Coating layer 15 Side wall member 16 Anchor 17 Foundation rubble mound 20 Revetment structure 30, 70 Impermeable layer 31 Impermeable material 40 Load transmission layer 41 Load Transmission material 50, 60 Impermeable/load transmitting layer 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J Revetment structure G Soft ground S10 Groove formation step S20 Revetment structure arrangement step S30 Water impermeability Layer Arranging Step S40 Load Transfer Layer Arranging Step

Claims (8)

a seafloor impermeable base having a groove formed in the upper surface thereof, the groove having a bottom along the horizontal plane and sidewalls perpendicular to the horizontal plane;
a revetment structure arranged at the bottom of the groove with a gap between it and the side wall of the groove;
an impermeable layer arranged to fill the gap between the revetment structure and the side wall of the trench;
A load transmission member is disposed so as to fill the gap between the bank protection structure and the side wall of the groove, and is capable of transmitting a horizontal force from the bank protection structure to the side wall as a shear force, wherein the horizontal force is transferred to the side wall. a revetment structure having a thickness in the vertical direction so as not to buckle vertically when the load is transferred to the side walls. The bank protection structure according to claim 1, wherein the load transfer layer is arranged in a plurality of layers in the vertical direction. The bank protection structure according to claim 1 or 2, wherein the impermeable layer and the load transfer layer are formed as the same layer. The bank protection structure according to any one of claims 1 to 3, wherein the impermeable layer is formed using a non-deforming impermeable impermeable material. The bank protection structure according to any one of claims 1 to 4, wherein the side wall is fixed to the impermeable base with an anchor. The bank protection structure according to any one of claims 1 to 5, wherein the groove has a coating layer covering irregularities formed on the bottom. The covering layer is a layer made of underwater concrete, a basic rubble mound using rubble, and a gap between the rubble used in the rubble mound is filled with underwater concrete-based material, asphalt mixture-based material, or soil-based material. The revetment structure according to claim 6, which is a hybrid foundation mound. forming a groove having a bottom along a horizontal plane and sidewalls perpendicular to the horizontal plane in the upper surface of the impervious base of the seabed;
arranging a revetment structure on the bottom of the groove with a gap between it and the side wall of the groove;
arranging an impermeable layer so as to fill the gap between the revetment structure and the side wall of the trench;
It has a load transmission member capable of transmitting a horizontal force from the revetment structure to the side wall as a shear force, and when transmitting the horizontal force to the side wall, the vertical force is not vertically buckled. arranging a load transmission layer with a set thickness so as to fill the gap between the revetment structure and the side wall of the trench.

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