JP6946064B2 - How to build a revetment - Google Patents

Description

The present invention relates to a revetment construction method.

When reclaiming land or breakwaters are to be constructed along the coast, revetments will be constructed on the seabed ground of the target area. This revetment is composed of a plurality of revetment structures (caisson, L-shaped block, etc.) arranged so as to surround the target area. Such a revetment structure is constructed in a manufacturing facility such as a shipbuilding dock or a floating dock on land, and is transported to the installation area by being launched and surfaced after construction and towed by a ship.

On the other hand, in the above method, the equipment required for the construction and transportation of the revetment structure becomes large-scale. Therefore, a method has been proposed in which the burden on the equipment required for the construction and transportation of the revetment structure is reduced by constructing the construction equipment on the sea and constructing the revetment structure (see, for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2001-214418

In the method as described in Patent Document 1 above, since it is necessary to construct the construction equipment of the revetment structure on the sea, the burden on the equipment is not reduced so much. In addition, since a period for constructing construction equipment and a period for dismantling are required, man-hours and construction period are required. Therefore, it is required to construct the revetment structure in a short period of time at low cost and efficiently.

The present invention has been made in view of the above, and an object of the present invention is to provide a revetment construction method capable of constructing a revetment efficiently at low cost in a short period of time.

The revetment construction method according to the present invention is a revetment construction method in which one or more box-shaped revetment structures are arranged on the seabed ground to construct a revetment, and is a material for placing from the bottom surface to an intermediate height on land. The first part construction process in which the first part of the revetment structure is constructed in a shape that allows it to float on water, and the mold along the outer shape of the second part, which is the remaining part of the revetment structure. An object in which the shore protection structure is placed in a state in which the frame member is installed in the upper part of the first portion and the building including the first portion and the mold member is floated in water. It includes a transportation step of transporting the structure to the area and a second part construction step of placing the casting material inside the mold member and constructing the second part on the upper part of the first part. ..

According to the present invention, since only the formwork members of the first part and the second part are formed on land, the manufacturing period on land can be shortened as compared with the case where the entire revetment structure is constructed on land. Can be done. Therefore, the number of products manufactured in a predetermined period can be improved. Further, since the formwork members of the first portion and the second portion are floated on water and transported in the built state, the depth of the portion submerged under the water surface can be made shallow when the formwork members are floated on water. There is a balance to assemble the formwork members locally after transportation. Therefore, the burden during transportation can be reduced, and even when a large-scale revetment structure is constructed, it can be efficiently transported. Further, since the casting material of the second portion is cast in the state where the formwork members of the first portion and the second portion are formed, the construction of the second portion can be efficiently performed on the water. Further, since the first part and the second part are divided into upper and lower parts, the first part becomes lighter and a general heavy machine can be used for launching and ascending, so that the cost can be reduced. can. This makes it possible to construct a revetment efficiently at low cost in a short period of time. Examples of the casting material include concrete and the like.

Further, at least one revetment structure may be a hybrid caisson containing a steel material and the casting material as constituent materials.

According to the present invention, a revetment using a hybrid caisson can be efficiently constructed in a short period of time.

Further, in the first part construction process, the steel material may be in a state of protruding upward from the first part to the upper end.

According to the present invention, the burden in the second partial construction process can be reduced by constructing the steel material up to the upper end in the first partial construction process.

Further, in the first part construction process, a portion of the steel material that protrudes upward from the first part is arranged at a position along the outer shape of the second part, and in the formwork member installation step, the steel material is used. A formwork member may be arranged along the outer shape of the second portion.

According to the present invention, by using a part of the steel material as a formwork, the casting material can be efficiently cast in the second partial construction process.

Further, in the first partial construction process, an auxiliary facility of the revetment structure may be installed in a portion of the steel material that protrudes upward from the first portion.

According to the present invention, the burden in the second part construction process can be reduced by installing the auxiliary facility of the revetment structure in the part of the steel material protruding upward from the first part. Examples of auxiliary facilities for revetment structures include water treatment facilities.

Further, the second part construction process may be performed with the first part floating in water.

According to the present invention, since the casting material of the second portion is cast while the first portion is floated on water, the burden on the equipment can be reduced.

Further, prior to the transportation step, a construction step of creating a mound portion on the seabed ground in the target area is further provided, and in the transportation step, the building is placed on the mound portion and the second partial construction is performed. The step may be carried out in a state where the structure is placed on the mound portion.

According to the present invention, since the casting material is placed in a state where the building is placed on the mound portion, the posture of the building can be stabilized and the second portion can be constructed. The mound portion can be constructed using, for example, rubble.

According to the present invention, it is possible to provide a revetment construction method capable of efficiently constructing a revetment in a short period of time.

FIG. 1 is a flowchart showing an example of a revetment construction method according to the first embodiment. FIG. 2 is a diagram showing an example of the first partial construction process according to the present embodiment. FIG. 3 is a diagram showing an example of a formwork member installation process according to the present embodiment. FIG. 4 is a diagram showing an example of a transportation process according to the present embodiment. FIG. 5 is a diagram showing an example of the second partial construction process according to the present embodiment. FIG. 6 is a diagram showing other examples of the mound portion forming step and the structure transporting step according to the present embodiment. FIG. 7 is a diagram showing another example of the second partial construction process according to the present embodiment. FIG. 8 is a diagram showing a state after the transportation step according to the present embodiment. FIG. 9 is a diagram showing another example of the second partial construction process according to the present embodiment. FIG. 10 is a diagram showing an example of the first partial construction process of the revetment construction method according to the second embodiment. FIG. 11 is a diagram showing an example of a formwork member installation process according to the present embodiment. FIG. 12 is a diagram showing an example of a transportation process according to the present embodiment. FIG. 13 is a diagram showing an example of the second partial construction process according to the present embodiment. FIG. 14 is a diagram showing another example of the transportation process according to the present embodiment. FIG. 15 is a diagram showing another example of the second partial construction process according to the present embodiment.

Hereinafter, embodiments of the revetment construction method according to the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same. Further, the components described below can be appropriately combined, and when there are a plurality of embodiments, each embodiment can be combined.

<First Embodiment>
FIG. 1 is a flowchart showing an example of a revetment construction method according to the first embodiment. The revetment construction method according to the present embodiment is to construct a revetment by arranging one or more box-shaped revetment structures on the seabed ground. As shown in FIG. 1, the revetment construction method according to the present embodiment includes a first partial construction process (S10), a formwork member installation process (S20), a transportation process (S30), and a second partial construction process (S10). S40) and is included.

In the present embodiment, the revetment is constructed on the seabed ground of the target area, for example, when a landfill, a breakwater, or the like is constructed in a coastal area. The revetment is composed of a plurality of revetment structures (caisson, L-shaped block, etc.) arranged around the target area or along the target area, for example. When the revetment is arranged around the landfill, for example, the adjacent revetment structures are closed by a joint structure in order to prevent the waste and earth and sand used for the landfill from flowing out to the sea area. There is. Further, in the present embodiment, as the revetment structure, a hybrid caisson containing a steel material and a casting material as constituent materials will be described as an example.

FIG. 2 is a diagram showing an example of the first partial construction process S10. As shown in FIG. 2, the first partial construction step S10 is a step of constructing the first portion 10 which is a part of the hybrid caisson. In the first partial construction step S10, first, a box-shaped steel material 30 which is a constituent material of the hybrid caisson is constructed. The entire steel material 30 is constructed from the bottom portion 30a to the upper end portion 30b.

After the steel material 30 is constructed, the first portion 10 is constructed by driving the driving material 14 which is a constituent material of the hybrid caisson. In this case, since the steel material 30 serves as the inner frame of the casting material 14, the first portion 10 can be efficiently constructed. The first part 10 is constructed, for example, in a shape that allows it to float on water. The first portion 10 is a portion composed of the casting material 14 from the bottom surface 10a to the height h1. This height h1 is an intermediate height from the bottom surface 10a to the total height h2 of the hybrid caisson. The height h1 is set to a height at which the first portion 10 can float on water. Specifically, the height h1 is set at a position higher than the water surface height hw when the first portion 10 is floated on water. As a result, the transportation step S20 described later can be performed without being restricted by the depth (draft) from the water surface height hw to the bottom surface 10a of the first portion 10.

The first partial construction step S10 includes a step of constructing the bottom portion 11 of the first portion 10 and a step of constructing a side portion of the first portion 10. The bottom portion 11 is a portion formed in a trapezoidal shape and arranged on the seabed ground of the target area. The side portion 12 is formed in a rectangular annular shape in a plan view. In the first partial construction process, the hollow portion 13 is formed in the portion of the first portion 10 surrounded by the side portion 12. By forming the cavity portion 13, the first portion 10 has a structure that allows it to float on water. Further, in the first partial construction step S10, by constructing the first portion 10, the steel material 30 is in a state of protruding upward from the upper end portion 10b of the first portion 10. The protruding portion 31 of the steel material 30 that protrudes upward from the first portion 10 is located at a position that warps the outer shape of the second portion 20, that is, the inner frame of the second portion 20, when the second portion 20 described later is constructed. It is placed in the position where

FIG. 3 is a diagram showing an example of the formwork member installation step S20. Note that FIG. 3 also shows a view when the first portion 10 and the steel material 30 are viewed from above in the direction of arrow A. As shown in FIG. 3, in the formwork member installation step S20, the formwork member 40 is installed on the upper part of the first portion 10. The formwork member 40 is installed along the outer shape of the second portion 20 (see FIG. 5), which is the remaining portion of the hybrid caisson. As the formwork member 40, for example, a steel plate or the like is used. In the present embodiment, the formwork member 40 is arranged at a position that serves as an outer frame of the second portion 20. As described above, the steel material 30 is arranged at a position serving as an inner frame of the second portion 20. Therefore, a rectangular annular space portion 50 is formed between the steel material 30 and the formwork member 40 in a plan view (arrow A direction view). In the present embodiment, the formwork member 40 is used when the building 70 composed of the first portion 10, the steel material 30, and the formwork member 40 is floated on water in the transportation step S30 and the second partial construction step S40, which will be described later. Install so that water does not enter the space 50.

FIG. 4 is a diagram showing an example of the transportation process S30. As shown in FIG. 4, the transportation step S30 transports the building 70 to the target area where the hybrid caisson is installed, with the building 70 floating in water (for example, seawater) W. In the transportation step S30, the building 70 is transported by, for example, a transport ship 60 or the like.

In the building 70, the upper end portion 10b of the first portion 10 is arranged above the water surface Wa in a state of floating on the seawater W. Further, the building 70 has a structure in which the cavity 13 is surrounded by the steel material 30, and water shielding is ensured. In addition, in the building 70, the formwork member 40 is installed in the space 50.

Further, in the transportation step S30, since the building 70 may be transported instead of transporting the entire hybrid caisson, the load required for transportation can be reduced, for example, the carrier 60 can be miniaturized.

FIG. 5 is a diagram showing an example of the second partial construction process S40. As shown in FIG. 5, in the second partial construction process S40, after the building 70 is arranged in the target area P, the casting material 14 is placed inside the formwork member 40 while floating in seawater W. .. Specifically, the driving material 14 is placed in the space 50 formed between the formwork member 40 and the steel material 30. Since the second partial construction step S40 is performed in a state where the building 70 is floated in the seawater W, the casting material 14 may be evenly cast in the circumferential direction of the space portion 50 in a plan view. As a result, the driving material 14 can be placed in the space 50 while stabilizing the floating posture of the building 70. The building 70 may have a structure in which a sinker is arranged on the seabed ground BT and is connected to the sinker by a wire or the like. As a result, it is possible to prevent the building 70 from being swept away from the target area P by wind, tidal current, or the like and moving. When casting the casting material 14, for example, a pier or the like may be formed to support the supply portion of the casting material 14, or the casting material 14 may be supplied from a ship such as a concrete mixer ship. By placing the driving material 14, the weight of the building 70 increases. As a result, the draft of the building 70 increases, and the bottom surface 10a of the first portion 10 comes into contact with the seabed ground BT. After that, the casting material 14 is supplied to the space portion 50 in a state where the first portion 10 is supported by the seabed ground BT. In this case, for example, the casting material 14 can always be filled in the air without making the formwork member 40 a watertight formwork.

After the casting material 14 is placed in the space portion 50, the casting material 14 is solidified to construct the second portion 20. As a result, the hybrid caisson 100 is constructed and the hybrid caisson 100 is installed in the target area. After the second portion 20 is constructed, the formwork member 40 is removed from the first portion 10 and the second portion 20. The formwork member 40 can be left behind. In this case, the formwork member 40 remains as a part of the hybrid caisson 100.

As described above, the revetment construction method according to the present embodiment can shorten the manufacturing period on land as compared with the case where the entire hybrid caisson 100 is constructed on land. Therefore, it is possible to improve the manufacturing efficiency in a predetermined period (increase the number of manufactured products). Further, since the first portion 10 is floated on water and transported in the built state, when the first portion 10 is floated on water, the depth of the portion submerged under the water surface can be made shallow. Therefore, the burden during transportation can be reduced, and even when a large hybrid caisson 100 is constructed, it can be efficiently transported. Further, since the casting material 14 of the second portion 20 is cast with the first portion 10 and the formwork member 40 formed, the second portion 20 can be efficiently constructed on the water. This makes it possible to efficiently construct a revetment in a short period of time.

In the revetment construction method according to the present embodiment, the hybrid caisson is a hybrid caisson containing a steel material 30 and a casting material 14 as constituent materials, and a revetment using such a hybrid caisson is efficiently constructed in a short period of time. be able to.

In the revetment construction method according to the present embodiment, in the first partial construction process S10, the steel material 30 is constructed in the second partial construction process S40 so that the steel material 30 protrudes upward from the first portion 10 to the upper end portion 30b. It is not necessary to do so, and the burden in the second partial construction process S40 can be reduced.

In the revetment construction method according to the present embodiment, in the first partial construction process S10, the protruding portion 31 of the steel material 30 is arranged at a position along the outer shape of the second portion 20, and in the formwork member installation step S20, the steel material 30 is used. Since the formwork member 40 is arranged between them along the outer shape of the second portion 20, a part of the steel material 30 can be used as the formwork member. As a result, the casting material 14 can be efficiently cast in the second partial construction step S40.

In the revetment construction method according to the present embodiment, in the second partial construction step S40, the building 70 is supported in order to cast the casting material 14 of the second portion 20 in a state where the building 70 is floated in the seawater W. There is no need to install equipment separately. As a result, the burden on the equipment can be reduced.

In the present embodiment, in the second partial construction process S40, the case where the casting material 14 of the second portion 20 is driven while the building 70 is floating in the seawater W has been described as an example. Not limited to. FIG. 6 is a diagram showing another example of the preparation process and the transportation process S30. FIG. 7 is a diagram showing another example of the second partial construction process S40.

For example, as shown in FIG. 6, prior to the transportation step S30, a creation step of creating a mound portion MD may be performed on a relatively shallow seabed ground BT near the target area P. In the construction process, for example, rubble, crushed stone, or the like is used to form the mound portion MD. After forming the mound portion MD, the building 70 is arranged above the mound portion MD in the transportation step S30. Then, by injecting seawater W or the like into the cavity 13 of the first portion 10, the building 70 is submerged and placed on the mound MD. After that, as shown in FIG. 7, the second partial construction step S40 may be performed with the building 70 mounted on the mound portion MD. As a result, since the casting material 14 is driven while the building 70 is placed on the mound portion MD, the posture of the building 70 can be stabilized and the second portion 20 can be constructed.

Further, in the present embodiment, the box-shaped revetment structure has been described as an example, but the present invention is not limited to this. FIG. 8 is a diagram showing a state after the transportation step S30. FIG. 9 is a diagram showing another example of the second partial construction process S40. For example, as shown in FIGS. 8 and 9, the revetment structure may be an L-shaped block.

As shown in FIG. 8, the first portion 15 has a side portion 17 arranged at a horizontal end portion of the bottom portion 16. The steel material 35 is arranged over the bottom portion 16 and the side portion 17, and has a protruding portion 36 protruding upward from the upper end portion 17b of the side portion 17. The formwork member 45 is installed along the outer shape of the second portion 25 (see FIG. 9). A rectangular annular space portion 55 is formed between the steel material 35 and the formwork member 45 in a plan view (arrow B direction view).

Then, as shown in FIG. 9, in the second partial construction step S40, the casting material 14 is driven into the space portion 55 formed between the formwork member 45 and the steel material 35. As a result, the building 75 is submerged in the seawater W, and the bottom surface 15a of the first portion 15 comes into contact with the seabed ground BT. After the casting material 14 is placed in the space portion 55, the casting material 14 is solidified to construct the second portion 25. As a result, the L-shaped block 100A is constructed and the L-shaped block 100A is arranged in the target area. Therefore, even if the revetment structure is an L-shaped block 100A, it is possible to efficiently construct the revetment in a short period of time.

Further, in the present embodiment, in the first partial construction process S10, an auxiliary facility such as a water treatment facility for the revetment structure may be installed in advance on the protruding portion 31 of the steel material 30. As a result, when the casting material 14 is cast in the second partial construction process S40, the burden of installing the auxiliary facility can be reduced.

<Second Embodiment>
Subsequently, the second embodiment will be described. In the first embodiment, the hybrid caisson will be described as an example of the revetment structure, but in the second embodiment, the RC caisson will be described as an example of the revetment structure. FIG. 10 is a diagram showing an example of the first partial construction process S110 of the revetment construction method according to the second embodiment.

As shown in FIG. 10, the first partial construction process S110 is a step of constructing the first portion 110 which is a part of the RC caisson. In the first partial construction process S110, the first portion 110 is constructed by placing the casting material 114, which is a constituent material of the RC caisson. The first portion 110 is constructed, for example, in a shape that allows it to float on water. The first portion 110 is a portion of the portion made of the casting material 114 from the bottom surface 110a to the height h3. This height h3 is an intermediate height from the bottom surface 110a to the total height of the RC caisson. The height h3 is set to a height at which the first portion 110 can float on water. Specifically, the height h3 is set at a position higher than the water surface height (draft) hw when the first portion 110 is floated on water.

The first partial construction step S110 includes a step of constructing the bottom portion 111 of the first portion 110 and a step of constructing the side portion 112 of the first portion 110. In the first partial construction step S110, the hollow portion 113 is formed in the portion of the first portion 110 surrounded by the side portions 112. By forming the cavity 113, the first portion 110 has a structure that allows it to float on water.

FIG. 11 is a diagram showing an example of the formwork member installation step S120. Note that FIG. 11 also shows a view when the first portion 110 is viewed from above in the direction of arrow C. As shown in FIG. 11, in the formwork member installation step S120, the inner formwork member 130 and the outer formwork member 140 are installed above the first portion 110. The inner formwork member 130 and the outer formwork member 140 are installed along the outer shape of the second portion 120 (see FIG. 13), which is the remaining portion of the RC caisson. As the inner formwork member 130 and the outer formwork member 140, for example, a steel plate or the like is used. In the present embodiment, the inner formwork member 130 is arranged at a position that serves as an inner frame of the second portion 120, which will be described later. Further, the outer formwork member 140 is arranged at a position that serves as an outer frame of the second portion 120. A rectangular annular space 150 is formed between the inner form member 130 and the outer form member 140 in a plan view (arrow C direction view). In the present embodiment, the inner formwork member 130 and the outer formwork member 140 are separated from the first part 110, the inner formwork member 130, and the outer formwork member 140 in the transportation step S130 and the second part construction process S140, which will be described later. When the building 170 is floated on water, it is installed so that water does not enter the space 150.

FIG. 12 is a diagram showing an example of the transportation process S130. As shown in FIG. 12, the transportation step S130 transports the building 170 to the target area where the RC caisson is arranged, with the building 170 floating in water (for example, seawater) W. In the transportation step S130, the building 170 is transported by, for example, a transport ship 160 or the like. In the building 170, the upper end portion 110b of the first portion 110 is arranged above the water surface Wa in a state of floating on the seawater W. Therefore, the building 170 can be stably transported without the seawater W entering the cavity 113 of the first portion 110.

FIG. 13 is a diagram showing an example of the second partial construction process S140. As shown in FIG. 13, in the second partial construction process S140, after the building 170 is arranged in the target area P, the casting material 114 is placed in the space 150 in a state of being floated in the seawater W. Since the second partial construction step S140 is performed in a state where the building 170 is floated in the seawater W, the casting material 114 may be evenly cast in the circumferential direction of the space portion 150 in a plan view. As a result, the driving material 114 can be placed in the space 150 while stabilizing the floating posture of the building 170. As in the first embodiment, the building 170 may have a structure in which a sinker is arranged on the seabed ground BT and is connected to the sinker by a wire or the like. As a result, it is possible to prevent the building 170 from being swept away from the target area P by wind, tidal current, or the like and moving. Further, when casting the casting material 114, for example, a pier or the like may be formed to support the supply portion of the casting material 114, or the casting material 114 may be supplied from a ship such as a concrete mixer ship. good. By placing the driving material 114, the weight of the building 170 increases. As a result, the building 170 is submerged in the seawater W, and the bottom surface 110a of the first portion 110 touches the seabed ground BT. After that, the casting material 114 is supplied to the space portion 150 in a state where the first portion 110 is supported by the seabed ground BT. Since the outer formwork member 140 is installed so that water does not enter the space 150, it is not necessary to perform a plurality of steps such as stepwise casting and solidifying the casting material 114, which is one step. The casting material 114 can be cast in the space portion 150.

After the casting material 114 is placed in the space portion 150, the casting material 114 is solidified to construct the second portion 120. As a result, the RC caisson 200 is constructed and the RC caisson 200 is placed in the target area. After the second portion 120 is constructed, the inner formwork member 130 and the outer formwork member 140 are removed from the first portion 110 and the second portion 120. It is not necessary to remove the inner formwork member 130 and the outer formwork member 140. In this case, the inner formwork member 130 and the outer formwork member 140 will remain as a part of the RC caisson 200.

As described above, in the revetment construction method according to the present embodiment, even when the RC caisson 200 is used as the revetment structure, the manufacturing period on land can be shortened as compared with the case where the entire revetment is constructed on land. can. Therefore, the manufacturing efficiency in a predetermined period can be improved (the number of manufactured products is increased). Further, since the first portion 110 is floated on water and transported in the built state, when the first portion 110 is floated on water, the depth of the portion submerged under the water surface can be made shallow. Therefore, the burden during transportation can be reduced, and even when a large RC caisson 200 is constructed, it can be efficiently transported. Further, since the casting material 114 of the second portion 120 is cast with the first portion 110 and the outer formwork member 140 formed, the second portion 120 can be efficiently constructed on the water. This makes it possible to efficiently construct a revetment in a short period of time.

In the second embodiment described above, in the formwork member installation step S120, a configuration in which the inner formwork member 130 and the outer formwork member 140 are arranged in the first portion 110 has been described as an example, but the present invention is limited to this. Not done. FIG. 14 is a diagram showing other states of the transportation process. FIG. 15 is a diagram showing another example of the second partial construction process.

For example, as shown in FIG. 14, in the formwork member installation process, the steel material 130A may be arranged instead of the inner formwork member 130. In this case, when the second portion 120 is constructed, the steel material 130A is arranged at a position that warps the outer shape of the second portion 120, that is, a position that serves as an inner frame of the second portion 120. A rectangular annular space 150 is formed between the steel material 130A and the outer form member 140 in a plan view. After that, as shown in FIG. 14, the building 170A having the first portion 110, the steel material 130A, and the outer formwork member 140 is transported.

Then, as shown in FIG. 15, in the second partial construction step S40, the casting material 114 is cast in the space portion 150 formed between the steel material 130A and the outer formwork member 140. As a result, the building 170A is submerged in the seawater W, and the bottom surface 110a of the first portion 110 touches the seabed ground BT. After the casting material 114 is placed in the space portion 150, the casting material 114 is solidified to construct the second portion 120. As a result, the RC caisson 200A is constructed and the RC caisson 200A is placed in the target area. Therefore, even when the steel material 130A is arranged instead of the inner formwork member 130, it is possible to efficiently construct the revetment in a short period of time.

The technical scope of the present invention is not limited to the above-described embodiment, and changes can be made as appropriate without departing from the spirit of the present invention.

10, 15, 110 First part 10a, 15a, 110a Bottom surface 10b, 17b, 30b, 110b Upper end part 11, 16, 30a, 111 Bottom part 12, 17, 112 Side part 13, 113 Cavity part 14, 114 Casting material 20 , 25,120 Second part 30,35,130A Steel material 31,36 Protruding part 40,45 Formwork member 50,55,150 Space part 60,160 Carrier 70,75,170,170A Building 100 Hybrid caisson 100A L type Block 200, 200A RC caisson 130 Inner formwork member 140 Outer formwork member P Target area S10, S110 First part construction process S20, S120, S120A Formwork member installation process S30, S130 Transport process S40, S140 Second part construction process W water, seawater MD mound part h1, h2, h3 Height Wa Water surface

Claims (7)

It is a revetment construction method in which one or more box-shaped revetment structures are placed on the seabed ground to construct a revetment.
On land, the first part construction step of building the pouring material from the bottom to the middle height by Da設, the first portion of the revetment structure in a shape capable of floating in water,
A formwork member installation step of installing a formwork member along the outer shape of the second part, which is the remaining part of the revetment structure, on the upper part of the first part.
A transportation process in which the building including the first part and the formwork member is floated on water, and the building is transported to a target area where the revetment structure is arranged.
A revetment construction method including a second part construction step of placing the casting material inside the formwork member and constructing the second part on the upper part of the first part. The revetment construction method according to claim 1, wherein the at least one revetment structure is a hybrid caisson containing a steel material and the casting material as constituent materials. The revetment construction method according to claim 2, wherein the first part construction step is a state in which the steel material protrudes upward from the first part to the upper end. In the first part construction process, a part of the steel material that protrudes upward from the first part is arranged at a position along the outer shape of the second part.
The revetment construction method according to claim 3, wherein the formwork member installation step is for arranging the formwork member along the outer shape of the second portion with the steel material. The revetment construction method according to claim 3 or 4, wherein the first part construction step is to install an auxiliary facility of the revetment structure in a portion of the steel material protruding upward from the first part. The revetment construction method according to any one of claims 1 to 5, wherein the second partial construction step is performed in a state where the building is floated on water. Prior to the transportation step, a construction step of creating a mound portion on the seabed ground in the target area is further provided.
In the transportation process, the building is placed on the mound portion, and the structure is placed on the mound portion.
The revetment construction method according to any one of claims 1 to 6, wherein the second partial construction step is performed with the building mounted on the mound portion.

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