Coastal erosion prevention structure, construction method of coastal erosion prevention structure, and coastal erosion prevention method

Abstract

To provide a structure for beach erosion prevention which can be simply obtained.SOLUTION: A structure K for beach erosion prevention comprises sandbags 1 arranged in parallel and a net 2 covering a periphery of the arranged sandbags 1. The net 2 including the arranged sandbags 1 is installed at a shore side of a beach.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a coastal erosion prevention structure, a construction method for a coastal erosion prevention structure, and a method for preventing coastal erosion. The present invention relates to a coastal erosion prevention method, and in particular to a coastal erosion prevention structure that can be easily obtained, It relates to construction methods and methods for preventing coastal erosion. [Background technology]

[0002] On the coast, bags are filled with filling material to prevent seawater from entering and causing erosion. There is a hand pack (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-218552 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the sand pack is made by pumping seawater from the local coast into the tank using an underwater pump. At the same time, a backhoe is used to dump the filling material into the tank, and the filling is carried out using a sand pump installed inside the tank. The sealing material and seawater are pumped into a large tube-shaped bag and filled with it. Problems arose that the system would be large-scale, requiring a "pump," "water tank," "sand pump," etc.

[0005] The present invention relates to a coastal erosion prevention structure that takes the above-mentioned problems into consideration, and an application method for the coastal erosion prevention structure. The purpose of the present invention is to provide a construction method and a method for preventing coastal erosion. [Means for solving the problem]

[0006] The coastal erosion prevention structure according to claim 1 comprises sandbags arranged side by side and a net covering the sandbags arranged side by side, and the net containing the sandbags arranged side by side is installed on the shore side of the coast. A coastal erosion prevention structure, comprising: The sandbag was covered with the net. It is something.

[0007] The coastal erosion prevention structure according to claim 2 is Sandbags arranged side by side, and these sandbags arranged side by side and a sheet-like net that is not a bag and covers the periphery of the sandbags. A coastal erosion prevention structure in which a shoreline is provided with a shore-side shoreline. Parallel The above The sandbags are generally V-shaped in plan view, and the opening of the V-shape is set up so that it faces the sea, and the opening of the V-shape is set up so that it narrows in the direction away from the sea. And, The seawater that has been blown over the coastal erosion prevention structure hits the coastal erosion prevention structure and When seawater returns to the sea, it is diverted in two directions from the tip of the approximately V-shaped shape, mitigating the impact force and In order to prevent damage to the coastal erosion prevention structure, and to move the coastal erosion prevention structure to the sea side, Can be prevented from moving It is something.

[0008] The coastal erosion prevention structure according to claim 3 is 2 In the described coastal erosion prevention structure, when seawater washes up and hits the coastal erosion prevention structure, and the seawater that has exceeded the coastal erosion prevention structure returns to the sea, the soil and sand in the seawater passes through the mesh of the net and seeps into the gaps in the sandbags lined up inside the net, increasing the weight of the coastal erosion prevention structure, and when the seawater that has exceeded the coastal erosion prevention structure returns to the sea, the soil and sand in the seawater accumulates in the sandbags lined up inside the net.

[0009] The construction method for coastal erosion prevention structures according to claim 4 comprises: Not a pouch Sheet-like The method includes a net laying step of laying a net, a sandbag installation step of installing a plurality of sandbags on the net laid in the net laying step, a covering step of covering the plurality of sandbags installed in the sandbag installation step with the net, and a binding step of binding the net covered in the covering step with a binding member so that it does not open.

[0010] The construction method for preventing coastal erosion according to claim 5 is the construction method for preventing coastal erosion according to claim 4, The system is equipped with sandbags arranged side by side and a net that covers the sandbags arranged side by side. The net containing the sandbags arranged in parallel is installed on the shore side of the coast to prevent coastal erosion. A structure for The sandbag installation process is as follows: The above The sandbags are generally V-shaped in plan view, and the opening of the V-shape is set up so as to face the sea, and the opening of the V-shape is set up so as to narrow in the direction away from the sea. The seawater that washed ashore hits the coastal erosion prevention structure. When the seawater that has exceeded the coastal erosion prevention structure returns to the sea, the tip of the approximately V-shaped The water is diverted in two directions from the edge of the river to absorb the impact force and prevent damage to the coastal erosion prevention structure. At the same time, the coastal erosion prevention structure can be prevented from moving toward the sea. It is something.

[0011] The method for preventing coastal erosion according to claim 6 comprises: Sheet-like material, not a bag A net laying process for laying a net; and placing sandbags on the net laid in the net laying process. In plan view, it is roughly V-shaped. a sandbag installation process for installing a plurality of sandbags; a covering process for covering the plurality of sandbags installed in the sandbag installation process with the net; and a forming process for forming a coastal erosion prevention structure by tying the net covered in the covering process with a binding member so as not to open up; after the forming process, when seawater washes up against the coastal erosion prevention structure and the seawater that has exceeded the coastal erosion prevention structure returns to the sea, soil and sand in the seawater pass through the mesh of the net and get into the gaps between the sandbags arranged side by side in the net, increasing the weight of the coastal erosion prevention structure, and when the seawater that has exceeded the coastal erosion prevention structure returns to the sea, The water is diverted in two directions from the tip of the V-shape to reduce the impact force and prevent coastal erosion. To prevent damage to the structure and to prevent the coastal erosion prevention structure from moving toward the sea, 、 The method includes a depositing step in which sediment in seawater is deposited in sandbags arranged side by side within the net. Effect of the Invention

[0012] According to the coastal erosion prevention structure of claim 1, the sandbags arranged side by side and the sandbags arranged side by side and a net covering the periphery of the sandbags, the net containing the sandbags arranged in parallel is set up on the shore side of the coast. Therefore, if there are multiple sandbags and nets, the amount of sand to be filled into the bags can be For example, it is possible to prevent coastal erosion simply by filling up the soil on the shoreline. If the structure continues to be used, the seawater may hit the coastal erosion prevention structure and cause damage to the sea. When seawater that has exceeded the structure for preventing shore erosion returns to the sea, the sediment in the seawater passes through the mesh of the net and If it gets into the gaps between the sandbags arranged side by side inside the net, it will increase the weight of the coastal erosion prevention structure. Both can be used to cover the sandbags arranged side by side within the net, allowing them to blend into the surrounding landscape.

[0013] According to the coastal erosion prevention structure of claim 2, the above-mentioned structure of claim 1 can be In addition to the effect of lighting, the sandbags arranged side by side are roughly V-shaped in plan view, and the opening of this roughly V-shaped is installed facing the sea, and the substantially V-shaped opening faces away from the sea. The structure is installed so that the area is narrow, so that the seawater that washes in hits the coastal erosion prevention structure and When seawater that has exceeded the erosion prevention structure returns to the sea, it is diverted in two directions from the tip of the roughly V-shaped structure, It absorbs impact force and prevents damage to coastal erosion prevention structures, and also This can prevent the body from migrating toward the sea.

[0014] According to the coastal erosion prevention structure described in claim 3, the sandbags arranged side by side and the and a net covering the periphery of the sandbags arranged side by side, and the net containing the sandbags arranged side by side is disposed on the shore of the coast. Since multiple sandbags and nets are installed nearby, the sand to be filled into the bags can be For example, coastal erosion can be easily prevented by simply packing up the soil on the shoreline. Moreover, continued use of the structure prevents seawater from washing ashore from hitting the coastal erosion prevention structure. When seawater that has exceeded the coastal erosion prevention structure returns to the sea, the sediment in the seawater is carried through the mesh of the net. The sand enters the gaps between the sandbags arranged side by side inside the net, increasing the weight of the coastal erosion prevention structure. At the same time, it can cover the sandbags arranged side by side inside the net, and blend in with the surrounding scenery. Cut.

[0015] According to the construction method for coastal erosion prevention structures described in claim 4, a net is laid on the shore side of the coast. A net laying process is a process of laying a net on the ground. A sandbag installation step of installing a plurality of sandbags; and surrounding the plurality of sandbags installed in the sandbag installation step. a covering step of covering the container with the net, and tying the net so that the container does not open. Since the method includes a bundling step of bundling the materials with a bundling member, the method can be easily performed and is easy to use. By continuing this, the seawater that washes ashore will hit the coastal erosion prevention structure, and the coastal erosion prevention When seawater that has exceeded the structure is returned to the sea, the sand in the seawater is dispersed through the meshes of the net and falls into the parallel net. The sandbags are then inserted into the gaps between the sandbags, increasing the weight of the coastal erosion prevention structure and causing the net to collapse. It can be used to cover the sandbags lined up side by side inside, allowing it to blend in with the surrounding landscape.

[0016] According to the construction method for a coastal erosion prevention structure described in claim 5, the above-mentioned claim 4 is In addition to the effects of the invention described above, the sandbags arranged side by side are substantially V-shaped in plan view, and this substantially V-shaped The opening is installed facing the sea, and the V-shaped opening is located away from the sea. The structure is installed so that it narrows in the direction of the coastline, preventing seawater from hitting the coastal erosion prevention structure. When seawater that has exceeded the coastal erosion prevention structure returns to the sea, it is diverted in two directions from the tip of the roughly V-shaped structure. This reduces the impact force, prevents damage to the coastal erosion prevention structure, and also contributes to the prevention of coastal erosion. It is possible to prevent the structure from moving toward the sea.

[0017] According to the method for preventing coastal erosion described in claim 6, a net is laid on the shore side of the coast. A net laying process, and placing a plurality of sandbags on the net laid in the net laying process. a sandbag installation step of installing the plurality of sandbags in the sandbag installation step; and a net around the plurality of sandbags installed in the sandbag installation step. and tying the net covered in the covering step with a tying member so that the net does not open. Since the method includes a bundling step and a stacking step, the method can be easily carried out. The seawater that washed ashore hit the coastal erosion prevention structure, and the seawater that exceeded the coastal erosion prevention structure When the net is returned to the sea, sand and sediment in the seawater passes through the meshes of the net and enters the gaps between the sandbags arranged side by side inside the net. The sandbags in the net are piled up, increasing the weight of the coastal erosion prevention structure and It can be covered and blended into the surrounding landscape. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic cross-sectional view showing an installation state of a coastal erosion prevention structure according to one embodiment of the present invention. [Diagram 2] FIG. 2 shows a construction method for the coastal erosion prevention structure of FIG. 1, where FIG. 2(a) is a schematic side view of the net installed on the shore side of the coast, which is the construction site, and FIG. 2(b) is a schematic plan view of FIG. 2(a). [Diagram 3] FIG. 3(a) is a schematic side view of the net of FIG. 2(a) with sandbags installed, and FIG. 3(b) is a schematic plan view of FIG. 3(a). [Figure 4] FIG. 4(a) is a schematic side view of the state in which the net of FIG. 3(a) is being placed, and FIG. 4(b) is a schematic plan view of FIG. 4(a). [Diagram 5] FIG. 5(a) is a schematic side view of the state in which the longitudinal ends of the net in FIG. 4(a) are bound together, and FIG. 5(b) is a schematic plan view of FIG. 5(a). [Figure 6] FIG. 6(a) is a schematic side view of the state in which the short ends of the net in FIG. 5(a) are bound together, and FIG. 6(b) is a schematic plan view of FIG. 6(a). [Figure 7] FIG. 7 is a schematic plan view of another embodiment of the coastal erosion prevention structure, which is installed in a state different from that of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A coastal erosion prevention structure according to an embodiment of the present invention, a construction method for a coastal erosion prevention structure, and a coastal erosion prevention method A method for preventing bank erosion will now be described with reference to FIGS. K shown in Figure 1 is a coastal erosion prevention structure installed on the shore side of the coast.

[0020] This coastal erosion prevention structure K is composed of sandbags 1 arranged side by side and the surroundings of these sandbags 1 (parallel It is equipped with a net 2 that covers the bottom, top, and sides between the bottom and top of the sandbag 1 that has been set up. The sandbag 1 is for storing, for example, about 1 to 2 tons of soil and sand, and a plurality of sandbags are The sandbags 1 are installed in a linear row along the coastline, for example. For example, about 10 to 60.

[0021] Therefore, if there are multiple sandbags and nets, the amount of sand to be packed into the bags can be, for example, All you have to do is pack up the soil on the shore side of the coast, and coastal erosion can be easily prevented. Continuing to use the structure will cause seawater to hit the coastal erosion prevention structure K, When seawater that has exceeded the erosion prevention structure K returns to the sea, the sediment in the seawater is transported through the meshes of net 2. , entering the gaps between the sandbags 1 arranged side by side in the net 2, and increasing the weight of the coastal erosion prevention structure K. At the same time, the sandbags 1 arranged side by side in the net 2 are covered, and the sandbags are blended into the surrounding scenery. This can be done.

[0022] The coastal erosion prevention structure K described above is constructed as follows. The construction method for coastal erosion prevention structures is as follows: First, a net is installed on the shore side of the coast as shown in Figure 2. 2 is laid (net laying process). For example, Net 2 is a rectangle with a length of about 11 m and a width of about 7.6 m. For example, the mesh size is about 50 mm square (the smaller the mesh size, the smaller the mesh size is, for example, 5 mm When the thickness is increased, the sand trapping performance improves and the scenery becomes even better. The fiber thickness is, for example, 6.3 mm. As shown in FIG. 3, multiple sandbags 1 are placed on top of the net 2 laid in the net laying process. Install (sandbag installation process). The sandbag 1 is, for example, cylindrical with a diameter of about 1 m and a height of about 1 m. The sandbag 1 is as shown in FIG. As shown in the figure, two rows of sandbags 1 are placed side by side (for example, five sandbags 1 are placed side by side in one row), leaving 1m above and below. The sandbag 1 is placed, for example, about 1 m from the end of the net 2 in the longitudinal direction and about 1 m from the end of the net 2 in the transverse direction. The starting point 21 will be placed approximately 2.1m from the edge of the board. As shown in Figs. 4 and 5, the surroundings of the multiple sandbags 1 installed in this sandbag installation process are as follows: Cover with net 2 (covering process). In order to prevent the net 2 covered in this covering process from opening, a binding member (e.g., rope R) is used. Binding (binding process) The net 2 is bound at its long and short ends (Figure 6). In addition, a single sandbag (1) will easily tip over and be washed away when hit by a wave, but when combined with a net (2), The sandbags 1 set up and the sandbags 1 stacked on top of the adjacent sandbags 1 are wrapped in a net 2 to form a colony. This can prevent the boat from tipping over or being washed away by waves.

[0023] The binding step is also a forming step. That is, the net 2 covered in the covering step is opened. The structure is formed to prevent coastal erosion by tying the rocks together with a tying material (e.g., rope R) so that the rocks do not get caught in the sea. (Forming process). The binding member may be, for example, a fastener, a cable tie, a string, Shackles, bolts, etc. After this formation process, the seawater that washed ashore hits the coastal erosion prevention structure K, and the coastal erosion prevention structure K When the seawater that has exceeded the structure K returns to the sea, the sand in the seawater passes through the meshes of the net 2 and is transported to the net. When the sand enters the gap between the sandbags 1 arranged side by side in 2 and the weight of the coastal erosion prevention structure K increases, When the net 2 is returned to the sea, the sand in the seawater is deposited in the sandbags 1 arranged side by side in the net 2 (deposition process). process).

[0024] A marine sewage treatment plant having the above-mentioned net laying process, sandbag installation process, covering process, forming process, and depositing process. If there are multiple sandbags and a net, the amount of sand to be filled into the bags will be For example, coastal erosion can be easily prevented by simply packing up the soil on the shoreline. Furthermore, due to the deposition process, the seawater that washed ashore hits the coastal erosion prevention structure K, and the coast When seawater that has exceeded the erosion prevention structure K returns to the sea, the sediment in the seawater is transported through the meshes of net 2. The sand enters the gaps between the sandbags 1 arranged side by side in the net 2, and the weight of the coastal erosion prevention structure is increased. At the same time, the surroundings of the sandbags 1 arranged side by side within the net 2 are covered, and the net is made to blend in with the surrounding scenery. can be done. In addition, the deposition process involves installing coastal erosion prevention structure K on the shore side of the coast and continuing to use it. This is what is obtained by

[0025] If the sandbag 1 breaks after the bundling process, the sandbag 1 breaks the net 2 at the broken part and Remove the torn sandbag 1, or leave the torn sandbag 1 as it is and remove the torn part of the net 2. A new sandbag 1 is inserted from the bottom, and then the torn net 2 is repaired (net repair process). In this case, repair can be easily and quickly carried out.

[0026] In the above embodiment, a plurality of sandbags 1 are set in a linear row along the coastline. However, the present invention is not limited to this. Although not shown, it is also possible to arrange a plurality of The sandbags 1 may be stacked on each of the multiple sandbags 1 arranged in a row, or, although not shown, The sandbags 1 may be stacked on the borders of the multiple sandbags 1 arranged in multiple linear rows. However, it is sufficient to stack sandbags 1 on top of multiple sandbags 1 arranged in multiple linear rows. As shown in FIG. 7, the sandbags arranged side by side may be formed into a substantially V-shape in plan view. The substantially V-shaped opening V1 is installed facing the sea side. The mouth V1 is arranged so that it narrows in the direction away from the sea.

[0027] In this coastal erosion prevention structure K, the seawater that washes ashore is When the seawater that has exceeded the coastal erosion prevention structure K returns to the sea, it flows out from the tip of the approximately V-shaped structure into a 2 The water is diverted in the opposite direction, mitigating the impact force and preventing damage to the coastal erosion prevention structure K. It is possible to prevent the coastal erosion prevention structure K from moving toward the sea.

[0028] In this case, the construction method for preventing coastal erosion is as follows: the sandbag installation process is as follows: When viewed from above, it is approximately V-shaped, and this approximately V-shaped opening V1 is installed facing the sea. In both cases, the approximately V-shaped opening V1 is installed so as to narrow in the direction away from the sea. After that, the process goes through the covering and bundling steps as described above. [Explanation of symbols]

[0029] K Coastal erosion prevention structure 1 Sandbag 2. Internet

Claims

1. Sandbags lined up side by side, A net is provided to cover the periphery of the sandbags arranged side by side, The coastal erosion prevention structure is configured such that the net containing the sandbags arranged in parallel is installed on the shore side of the coast, The sandbags are arranged side by side on the sheet-like net, which is not a bag, and the periphery of the sandbags is covered with the net. A coastal erosion prevention structure characterized by:

2. Sandbags arranged side by side; and a sheet-like net that is not a bag and covers the periphery of the sandbags arranged side by side. The coastal erosion prevention structure is configured such that the net containing the sandbags arranged in parallel is installed on the shore side of the coast, The sandbags arranged side by side are generally V-shaped in plan view, and the opening of the generally V-shape is arranged so as to face the sea, and the opening of the generally V-shape is arranged so as to narrow in a direction away from the sea, When the seawater that washes ashore hits the coastal erosion prevention structure and the seawater that goes over the structure returns to the sea, it is diverted in two directions from the tip of the approximately V-shape, which reduces the impact force and prevents damage to the coastal erosion prevention structure as well as blocking the movement of the coastal erosion prevention structure toward the sea. A coastal erosion prevention structure characterized by:

3. When the seawater that washes up hits the coastal erosion prevention structure and the seawater that exceeds the coastal erosion prevention structure returns to the sea, the soil in the seawater passes through the mesh of the net and enters the gaps between the sandbags lined up inside the net, increasing the weight of the coastal erosion prevention structure, and when the seawater that exceeds the coastal erosion prevention structure returns to the sea, the soil in the seawater accumulates in the sandbags lined up inside the net.

3. A coastal erosion prevention structure according to claim 2.

4. a net laying process for laying a sheet-like net that is not a bag on the shore side of the coast; a sandbag installation step of installing a plurality of sandbags on the net installed in the net installation step; a covering step of covering the periphery of the plurality of sandbags installed in the sandbag installation step with the net; a bundling step of bundling the net covered in the covering step with a bundling member so that the net does not open; have A construction method for preventing coastal erosion.

5. Sandbags arranged side by side; A net is provided to cover the periphery of the sandbags arranged side by side, The coastal erosion prevention structure is configured such that the net containing the sandbags arranged in parallel is installed on the shore side of the coast, The sandbag installation step includes installing the sandbag so that the sandbag has a substantially V-shape in a plan view, and an opening of the substantially V-shape faces the sea side, and the opening of the substantially V-shape narrows in a direction away from the sea, When the seawater that washes ashore hits the coastal erosion prevention structure and the seawater that goes over the structure returns to the sea, it is diverted in two directions from the tip of the approximately V-shape, which reduces the impact force and prevents damage to the coastal erosion prevention structure as well as blocking the movement of the coastal erosion prevention structure toward the sea.

5. The method for preventing coastal erosion according to claim 4.

6. a net laying process for laying a sheet-like net that is not a bag on the shore side of the coast; a sandbag installation step of installing a plurality of sandbags on the net installed in the net installation step so as to form a substantially V-shape in a plan view; a covering step of covering the periphery of the plurality of sandbags installed in the sandbag installation step with the net; a forming step of forming a coastal erosion prevention structure by binding the net covered in the covering step with a binding member so that the net does not open; After this formation step, when the seawater that has washed ashore hits the coastal erosion prevention structure and the seawater that has exceeded the coastal erosion prevention structure returns to the sea, the soil in the seawater passes through the mesh of the net and enters the gaps between the sandbags arranged side by side in the net, increasing the weight of the coastal erosion prevention structure, and when the seawater that has exceeded the coastal erosion prevention structure returns to the sea, it is diverted in two directions from the tip of the approximately V-shape, mitigating the impact force, preventing damage to the coastal erosion prevention structure, preventing the coastal erosion prevention structure from moving toward the sea, and a depositing step is provided in which the soil in the seawater is deposited in the sandbags arranged side by side in the net. A method for preventing coastal erosion comprising the steps of:

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