JP4606454B2 - Construction method of managed revetment - Google Patents

Description

  The present invention was constructed as a revetment that demarcates a waste dumping site using an existing breakwater and marine structures such as a revetment, and was effectively demarcated using a port surrounded by the existing breakwater. The present invention relates to a construction method of a management-type revetment that enables water shielding to be satisfactorily exhibited so that water does not enter and exit even if waste is dumped inside.

In order to reclaim waste in the sea, when building a revetment that partitions the landfill and surrounds it, a foundation mound is built on the surface of the seabed, and rubble is piled up to a predetermined height. An off-the-shelf structure such as caisson is installed on the foundation mound. In this way, it is considered that landfills are dumped inside the port by using a breakwater of a port that is no longer used without using a new method of building a revetment.
In addition, when constructing a landfill that is partitioned by the revetment, it is necessary to use means to prevent water from flowing in and out of the revetment. For this purpose, the foundation mound inside the revetment and the seabed ground In addition to a method of laying a water-impervious sheet or mat on the surface without gaps, or a method of constructing a fluid barrier material, such as an asphalt mixture, into a layer with a predetermined thickness, the joint between caisson In some cases, a water shielding means corresponding to the site, such as water shielding treatment of the part, is additionally used (see, for example, Patent Document 1).
JP 2001-152425 A

However, when applying a water-impervious treatment method that lays out conventional water-impervious sheets and water-impervious mats and prevents the flow of water inside and outside the revetment, there are water-impervious sheets that are laid on the surface of the foundation mound. In many cases, processing cannot be performed so that a gap is not generated at both ends of the caisson side and the seabed ground side. In particular, in recent years, there are many cases of securing landfill disposal sites for sea areas with a water depth of 10 m or more. In such deep water areas, water shielding sheets such as laying water shielding sheets without any gaps are provided. Many problems have emerged in construction work.
In addition, in a general structure constructed by installing caisson on the foundation mound as a revetment main body work, water permeability such as sand or silt of the seabed ground between the stones of the foundation mound or the caisson is installed. It is inevitable that water will flow between the inside and outside of the partition revetment through the stratum that has properties.

  In addition, even when the seabed ground is well sealed, there may be incomplete water shielding between the bottom surface of the caisson and the foundation mound, and the water retained in the landfill will leak into the open ocean. Etc. are likely to occur. Further, in addition to the case where the seabed ground is a soil having a small permeability, even in the case of a rock having a low permeability, water may circulate between the lower surface of the caisson and the rock, such a construction site There are still many problems that need to be solved in the water shielding treatment in the area.

In recent years, there have been proposals to use existing breakwaters as partition revetments and use the inside of a port as a waste disposal site as a means of effectively using a port that has been disused. . The use of the above alternative means that the construction can be carried out relatively easily than the construction of a new waste disposal site, and the landfill is created by reclaiming waste using existing structures. It is possible to create a new land and provide it to new demands such as parks by performing a process such as depositing soil to stretch plant roots with a predetermined thickness on the ground surface after performing There is also an advantage.
However, when such an existing port is used as a disposal site, there are many gaps between both the foundation mound supporting the breakwater body and the seabed ground, and the joints of the existing caisson, or relatively water-permeable In many cases, it has properties. As a result, the cost of water-impervious treatment for the existing structure may not be cheap compared to the case where a partition revetment is newly constructed, and a more effective construction method is currently being sought. .

  The present invention constructs the waste sea surface disposal site using a structure such as an existing breakwater, and can effectively use a port that is no longer used. However, it is intended to make it possible to construct a highly reliable water shielding part by performing a water shielding process easily.

The present invention relates to a revetment construction method for constructing a revetment that divides a waste dumping site using an existing marine structure such as a breakwater, a quay, and a revetment.
In the invention of claim 1, when the ground where the existing marine structure is constructed is a water-permeable ground, a predetermined width and depth are within a predetermined range in the thickness direction of the existing structure. The ground improvement process to make the water-impermeable ground
Building a wall-shaped impermeable layer of a predetermined height on the seabed ground on which the impermeable improvement is performed on both sides of the existing structure, with a predetermined interval from the structure,
Between the wall-shaped impermeable layer and the existing structure, construct a layer of a water shielding material so as to cover the base of the structure to a predetermined height,
It is constructed as an impermeable partition revetment in which the existing structure and the ground on which impermeable improvement is performed are integrated.

In the revetment constructed using the existing structure, the invention according to claim 2 lays a sheet member exhibiting water shielding along the side of the structure on the side of the structure on the landfill side. And
The lower part of the sheet member is subjected to a treatment for holding and fixing in the layer of the water shielding material covering the base of the structure,
It is characterized by applying a treatment to improve water shielding at the revetment built using existing structures.

  As mentioned above, when constructing a partition revetment using the existing breakwater of the existing port, etc., construct the impervious ground so that the permeability coefficient of the submarine ground as the supporting foundation will be small. At the same time, it is possible to easily construct a section of a waste landfill disposal site by performing a process of providing water shielding between the lower part of the caisson and the impermeable ground improvement part as the support base.

In addition, even when the submarine ground for constructing the revetment is a rock with a small permeability coefficient, a layer of a water-impervious material is formed with a predetermined thickness over a predetermined range between the lower part of the existing structure and the ground. By only constructing, it is possible to provide a partition that can exhibit good water shielding properties.
And, by using the breakwaters and other facilities that are no longer in use, building a landfill for the waste disposal site, you can easily build a revetment with a short construction period and low construction costs. It is also possible to effectively use the facilities on land.

  The construction method of the management type revetment will be described according to the example shown in the figure. When building a new partition revetment that surrounds a general management-type waste landfill site, the construction of the ground as a water-impervious layer is first performed according to the permeability of the seabed ground that constructs the revetment. . For example, when the seabed ground is sandy ground, cement or lime-based solidified material is injected into the ground and mixed with the ground sand, and the entire ground is treated to become an impermeable layer. And, by constructing a water-impervious treatment between the caisson and other structures standing on the ground and the ground, and at the seam between the caissons, in the disposal site surrounded by the newly built revetment Then, the water contaminated by contact with the discarded waste is confined in the compartment, and is purified through a wastewater treatment means provided separately, and then discharged to the outside of the compartment.

  As described above, instead of establishing a new waste disposal site, using a structure such as a breakwater such as an existing port, the port area will be used as a landfill site for new purposes. Supply is also considered. It is possible that the mission as a port will end, the water depth of the port will be shallow for some reason, or for other reasons to give the port a new purpose and bring it back to life. .

  As mentioned above, the ground where a structure such as a breakwater that is no longer used is constructed as a waste landfill site in a port that is to be provided for reuse must be permeable geology. There are many. In addition, since the foundation portion where the breakwater is installed did not particularly require water-blocking, means for preventing water from passing between the stones of the foundation while retaining large stones. Are often not used. Therefore, it is necessary to construct a water-impervious treatment so that water does not circulate between the inside of the port and the open sea in order to provide new use as a waste disposal site for such water-permeable ground and foundations. Occurs.

In order to deal with the above-described purpose, the example shown in FIG. 1 describes the structure of a breakwater when an existing breakwater is used as a partition revetment in a waste landfill. In the breakwater 10, the base portion 17 that supports the caisson 11 is generally constructed by stacking stones of a predetermined size, and water flows between the stones of the base portion 17. The possible gap remains large.
Moreover, in the submarine ground supporting the existing breakwater etc., the sedimentary layer 3 on the rock mass 2 having the property of impermeable layer is treated as a ground improvement part capable of exhibiting imperviousness in particular. Often not. Therefore, in the existing marine structures such as the breakwater constructed on the ground having water permeability as described above, the water permeability of the ground and the water flowability in the foundation part 17 are simultaneously eliminated, and a new revetment is created. It is required to build.

  As shown in FIG. 1, when using the existing offshore structure 10, first, the embankment layer 23 is constructed with a predetermined width and height on both sides of the existing caisson 11 with a predetermined interval. Over the embankment layer 23 and the deposited layer 3, the impermeable ground is improved to construct the wall-shaped impermeable treatment layers 22, 22 in a wall shape having a predetermined thickness. In addition, for the deposition layer 3 between the wall-shaped impermeable treatment layers 22 and 22a, a construction to improve the ground improvement portion 4 as much as possible is performed, and the formation 4 with improved soil quality is sandwiched between them. A better effect can be obtained by performing a process for preventing water from flowing between the deposited layers 3 on both sides. Then, after removing excess soil between the wall-like treatment layers 22 and 22a, an asphalt mixture layer 20 is casted to construct a lower water-impervious layer, and a material with high fluidity is formed. The base stone is filled with the base stone, and the asphalt mixture layer 20 supports the base of the caisson 11 and constructs a wide impermeable layer on the seabed ground.

  In the example shown in FIG. 1, the wall-like impermeable treatment layers 22 and 22a are mixed with a solidified material such as cement in the soil in the same manner as when the ground improvement part 4 is constructed. By improving the water permeability, it is also possible to use a technique of constructing a water-impermeable wall-like partition in the ground. For example, as the ground improvement part 4, it is possible to construct a ground improvement part in the shape of a wall by continuously placing a sand pile-like structure on the seabed ground. It is also possible to construct as a water-impermeable stratum using a construction method in which a mixture of cement is erected adjacently to form a sand wall.

  When building a partition revetment in a landfill using the existing breakwater, etc., when there is a gap between caissons, as in the case of constructing a water shielding work between conventional caissons, It is necessary to insert a sealing member between the caissons and perform additional work such as filling the gap with the asphalt mixture to perform a water shielding treatment at the caisson joint. Further, in addition to the water shielding treatment between the caissons, a partition is provided by additionally laying a water shielding sheet along both sides or one side of the caisson in the sea to cover the side surface of the caisson. It is also possible to further improve the water shielding performance at the revetment. For example, in the example of FIG. 1, a water shielding sheet 15 is laid along the side of the caisson 11 on the inland sea side, and the lower part of the water shielding sheet 15 is pressed against the asphalt mixture layer 20 by a press block 15a or the like. It can also be integrated in the pressed state to eliminate gaps and to exhibit better water shielding.

  In the example shown in FIG. 1, there are cases where sufficient waterproof performance cannot be exhibited even by improving the ground as a water-impermeable one and by a water-proof and water-stopping treatment between the caisson joints. At such a site, a steel sheet pile is driven so as to reach the impervious treatment layer 22 of the ground, a water shielding treatment is performed between adjacent sheet piles, and the pile wall 25 is constructed, thereby preventing water impermeability. It is also possible to perform a process for exhibiting. Further, in some cases, between the caisson 11 and the pile wall 25, when filling a filler and pressing the end of the water shielding sheet 15, and using a material that can exhibit water shielding as the filler, The water barrier property can be further improved and the structure can be stabilized.

  In other words, as described in the above-described embodiment, it is considered that sufficient waterproof performance cannot be exhibited even by performing the process of erecting a wall-shaped impermeable layer and the waterproofing / sealing process between the caisson joints. Sometimes. For this, as described in FIG. 1, a pile wall is constructed by driving a steel sheet pile so as to reach the impermeable treatment layer 22 of the ground, and along the side surface of the caisson 11. Thus, it is explained that by adding a treatment for laying the water shielding sheet 15, the water shielding property can be exhibited better and the structure can be stabilized.

  Unlike FIG. 1, in the example shown in FIG. 2, when using an existing offshore structure, a predetermined interval is first provided on both sides of the caisson with respect to the ground 3 supporting the existing caisson 11. Then, the wall-like impermeable treatment layers 22 and 22 are constructed. The impermeable treatment layer 22 constructed in the shape of a wall can be constructed by applying a treatment such as mixing a solidifying material such as cement into the soil of the ground 3 of the deposition layer. At an appropriate timing, pile walls 25 projecting to a predetermined height from the ground are placed in a row on the outside of each of the wall impermeable treatment layers 22, 22, and the asphalt mixture layer 20 is formed. It is provided as a partition to be constructed. Then, an asphalt mixture layer 20 is placed in the space between the pile wall 25 and the caisson 11 so as to fill the ground, the foundation 17 and the lower part of the caisson 11. By performing the process of constructing the layer of the water shielding material, the wall-like treated layers 22 and 22 and the asphalt mixture layer 20 are integrated, and the base of the caisson 11 is supported, and the width is formed in the seabed ground and in the upper part. Build a wide water barrier layer.

  In the example shown in FIG. 3, when an existing marine structure is used and improved as a new revetment, first, on both sides of the portion where the caisson 11 is located with respect to the ground 3 supporting the existing caisson 11. Then, sandbags, concrete blocks, and the like are stacked at a predetermined interval to construct partition walls 24 and 24 having a predetermined height. Next, inside the partition walls 24, 24, a wall-like impervious treatment that can improve the water permeability of the ground by mixing a solidified material such as cement into the soil of the seabed ground 3 and exhibiting a water barrier property. The layers 22, 22 are constructed as walls having a predetermined thickness.

  And on the said wall-like impermeable treatment layers 22 and 22, the thing which mixed sand and asphalt mixture is built, and it builds in the shape of a wall, The additional impermeable layer 22a is made into the said wall-like impermeable treatment Combine layers 22 and 22 so that they are connected together. Therefore, the additional impermeable layers 22a and 22a are constructed so that the wall-shaped impermeable layers 22 and 22a are integrally connected in the upper and lower sides over the ground and the ground, and a predetermined interval is provided on both sides of the caisson 11. Build it as a water-impervious layer. Then, an asphalt mixture layer 20 is placed in the space formed between the water-impervious walls 22 and 22a and the caisson 11 so as to fill the ground, the foundation 17 and the lower part of the caisson 11.

  In the embodiment of the present invention, the case where an asphalt mixture is used as the water shielding material has been described. However, in order to construct the water shielding layer, a soil-based water shielding material, a concrete water shielding material, or a chemical water shielding material is used. It is possible to use a material, and in addition, it is also possible to construct by combining two or three of the above-mentioned water shielding materials. When constructing a combination of different types of water-shielding materials, using a water-shielding material of any thickness, construct the layers so as to be stacked one above the other or any thickness The construction cost of the water shielding layer may be reduced by using a method of constructing the water shielding layers so as to be adjacent to each other in a row. For example, when construction is performed using only an asphalt mixture as the water shielding material, the cost of the asphalt mixture is relatively high, so that sufficient water shielding can be achieved and the construction cost of the water shielding layer can be reduced. In many cases, it is strongly desired to construct in combination with other water shielding materials.

  In addition to the asphalt mixture, a conventionally used soil-based water-insulating material, concrete-based water-insulating material, or chemical-based water-insulating material can be used as the material used as the water-insulating material. For example, as a soil-based water-impervious material, a concrete-based water-impervious material can be used by adding an additive that prevents arbitrary solidification to clayey soil and performing a treatment that does not solidify. As a material, it is possible to use a material in which mortar or cement is mixed with soil or sand at a predetermined ratio in addition to concrete. And in the case of constructing the water shielding layer by laminating a plurality of layers of water shielding material, as shown in the examples described below, a plurality of types of water shielding material layers were laminated in any vertical and horizontal directions. It can be constructed as a water shielding layer.

  In the example shown in FIG. 4 apart from the example described in each of the above embodiments, when the seabed ground is sandy ground, it is constructed by standing a water shielding layer in a wall shape so as to have a predetermined thickness. A case in which a sheet pile is further placed on the water shielding layer to construct a strong water shielding layer in a vertical wall shape is described. In the embodiment described in FIG. 4, the base is not built high on the ground 3, and a thin stone layer is provided so as to level the ground surface supporting the caisson, and then the caisson is placed. The case where the old structure was constructed using the method is described.

  In this example, with respect to the ground 3 supporting the caisson 11, a concrete wall 28 is constructed to a depth reaching the impermeable layer 2 through a predetermined interval on both sides of the caisson. Furthermore, the sheet pile 29 is located in the concrete wall 28 or along the wall 28 to construct a water shielding wall. Of course, it is not possible to place a sheet pile in the concrete wall. Then, after constructing the sheet pile wall, a method of constructing the wall 28 by placing concrete on both sides thereof may be used.

  As with the water shielding layer 20A, a water impermeable treatment portion in which a soil-based water shielding material and an asphalt mixture are laminated for the space portion formed between the water shielding wall 28 and the base of the caisson 11. It is possible to construct. In addition, as the water-impervious treatment layer 20B, a concrete-based water-impervious material layer 20c is applied on the soil-based water-impervious material layer 20a, and the upper surface thereof is covered with an asphalt mixture layer 20b. You may perform the process which the water leak from the surrounding part does not arise. As described above, when performing the water shielding treatment of the base of the caisson, it is possible to construct using any material such as a water shielding material, which has been conventionally used as a water shielding material. .

  Each embodiment described in FIGS. 1 to 3 is an example in which the seabed 1 is present on the bedrock 2 as an impermeable layer and the sedimentary layer 3 is present as a layer through which water such as sand passes. is there. Apart from such an example, when the offshore structure 10 is constructed by directly installing the caisson 11 or the like on the rock mass 2 that is very strong and has a small hydraulic conductivity, FIGS. An example like this is also conceivable. In the example shown in FIG. 5, when the ground is hard and impermeable, end blocks 21 and 21a having a predetermined height and width are installed on both sides of the caisson 11 (inside and outside sea area side), The asphalt mixture is filled between the partial blocks so as to ensure water shielding at the lower part of the caisson. The asphalt mixture layer 20 is preferably constructed at the same height as the end block 21 so that the base of the caisson 11 is buried to a predetermined height.

The end block can be easily constructed on the bedrock 2 by using a construction method such as placing underwater concrete while a formwork is assembled on the seabed. In addition, the end block 21 can also be constructed by creating a relatively large concrete block on land, transporting it by a trolley or the like, and sinking it in a predetermined sea area.
Further, in the example shown in FIG. 6, an optional water shielding material is filled between the end blocks 21, 21 a constructed on both sides of the caisson 11, and then the top surface of the water shielding material layer 20 a is a layer of asphalt mixture. Covering with 20b, the water-impervious treatment layer 20A on both sides of the caisson is constructed. In the example illustrated in FIG. 6, it is described that the water shielding layer is substantially omitted between the block 21 and the caisson. However, on the land side of the caisson, a water shielding work is performed as in the other examples. Shown as construction. Thus, even in the partition revetment as shown in the other embodiments, it is considered that the water shielding layer constructed so as to fill the base of the caisson does not need to be treated or only one side is sufficient. In some cases, it is not always necessary to construct thick water barriers on both sides of the caisson.

In the water-impervious wall constructed as described above, it is possible to apply a generally used method for water-impervious treatment between caissons. For example, in the example illustrated in the side view of FIG. 7 and the plan view of FIG. 8 shown as one example, as in the case of FIG. 6, a foundation portion in which trapezoidal stones are stacked on the seabed ground is constructed. However, although the structure having the caisson mounted and standing directly on the ground is described, the water shielding work between the caisson described below is not limited to the structure of the foundation.
The caisson 11 for constructing the offshore structure 10 is constructed by arranging a plurality of things having a predetermined height, thickness and length, and constructing a partition around the landfill. And the joint water-impervious treatment part 12 for water-shielding between the caisson 11 (between joints) is comprised using the general construction method conventionally used as shown in FIG. can do.

  As the joint water-impervious treatment portion 12 shown in FIGS. 7 and 8, a seal member 13 configured in a substantially cylindrical shape with rubber or the like is disposed between the caissons 11 and 11 at a predetermined interval. , 13a is filled with an asphalt mixture to form a joint filling layer. Further, an arbitrary formwork may be arranged outside the seal member 13a to construct a layer 14a of a solidifying material such as concrete. In addition, the inside of the sealing members 13 and 13a is also filled with asphalt mixture, sand, or the like as necessary to protect the sealing member 13 from being crushed. In addition to using such a method, it is also possible to apply a conventionally known joint impermeable work.

  On the ground (surface) inside the groove where the structure is to be installed, a mat having a water-impervious property is laid without constructing the foundation stone layer, or asphalt mixture and underwater concrete with a predetermined thickness. It is also possible to use a publication in which a water-blocking body capable of exerting water-blocking properties is constructed by providing a water-blocking property between the water-impermeable ground and the water-blocking body. And after installing a caisson on the said water-impervious body, an asphalt mixture is laid to cover the base of the caisson, and a water-impervious treatment is performed between the structure and the water-impervious (impermeable) ground. It is also possible.

  Further, the asphalt mixture layer 20 is applied so as to cover both side surfaces and the lower surface of the base portion of the caisson 11 so as to cover the base portion of the caisson 11 within a predetermined range, and the base portion of the caisson 11 is interposed via the asphalt mixture layer 20. Can be integrated. And, when the base of the caisson is firmly supported by the asphalt mixture, even when a wave impact is applied to the revetment, the caisson and the end block are integrated in the offshore structure. It is possible to satisfactorily exert the action of holding

As shown in the examples of FIGS. 7 and 8, when constructing a water shielding work between caissons, after constructing a water shielding work between the caisson 11 standing in a row, the asphalt mixture layer 20 is formed. The caisson base is filled, and then the water shielding sheet 15 is applied to the land side of the caisson 11. And the lower part of the water shielding sheet 15 is extended on the asphalt mixture layer 20 by a predetermined length, and the pressing layer 16 is constructed on the ground.
Furthermore, if necessary, the tip of the water-impervious sheet can be held using means for arranging an asphalt block or the like at the end of the water-impervious sheet 15. The pressing layer 16 and the end block 16a can be constructed by laying an asphalt mat having an arbitrary thickness or by placing an asphalt mixture, so that water is formed in the lower part of the water shielding sheet 15. Make sure there are no gaps.

  In each of the embodiments of the present invention, in the water shielding material layers 20 and 20A constructed at the base of the caisson, as described above, a plurality of types of water shielding materials are laminated to further improve the water shielding properties. Layers can be constructed, and the thickness and the like of each material when the layers are stacked can be appropriately set. In addition to the base water shielding material layer, also in the water shielding layer constructed in a wall shape with a predetermined thickness on the side of the caisson, as described above, combining a plurality of water shielding materials having different properties, This can be done by forming a water shielding layer. In addition, when an asphalt mixture is used as the water shielding material, the mixing ratio of asphalt components, aggregates, and other mixtures in the mixture correspond to the roughness of the sea area that constructs the structure, construction efficiency, etc. And can be set arbitrarily.

  In addition, as the soil-based water-impervious material filling the joint water-impervious layer 14 between the caissons, any clay-like material can be used. It is possible to use a mixture of components that suppress precipitation, etc., and maintain the properties as a water shielding material over a long period of time by holding the clay component so as not to be consolidated and solidified. To do. Furthermore, when using a concrete-based water shielding material, it is possible to cast concrete and mortar formed at an arbitrary mixing ratio alone, but when placing relatively thick, pebbles and chestnuts After the layer is constructed, a concrete water-impervious material may be placed to construct a water-impervious layer in which these stone layers are integrated with the concrete water-impervious material.

It is explanatory drawing of the example which constructs a partition revetment using the existing breakwater etc. of this invention. It is explanatory drawing of another Example which constructs a partition revetment using the existing breakwater. It is explanatory drawing of the example different from FIG. It is explanatory drawing of the construction example of the water-impervious layer by a concrete wall. It is explanatory drawing of the example of the offshore structure constructed | assembled without excavating a rock. It is explanatory drawing of the modification of the water shielding layer of FIG. It is explanatory drawing of the joint water-impervious treatment part provided between caisson. It is a top view of the joint water-impervious treatment part of FIG.

Explanation of symbols

1 submarine ground, 2 bedrock, 3 sedimentary layer, 4 impermeable ground improvement section,
6 foundation stone layer, 7 end block, 10 offshore structure,
11 caisson, 12 joint impermeable treatment part, 13 seal member,
14 joint filling layer, 15 water-impervious sheet, 16 holding block,
17 foundation, 20 asphalt mixture layer, 21 end block,
22 wall-like impermeable treatment layer, 22a additional impermeable layer, 23 embankment layer,
24 partition walls, 25 pile walls, 26 connectors, 27 fillings.

Claims (2)

When constructing a revetment that divides a waste dumping site using existing marine structures such as breakwaters, quay walls, and revetments,
When the ground on which the existing marine structure is constructed is a water-permeable ground, it is impervious to a predetermined range in the thickness direction of the existing structure over a predetermined width and depth. Construction of ground improvement processing to be the ground,
Building a wall-shaped impermeable layer of a predetermined height on the seabed ground on which the impermeable improvement is performed on both sides of the existing structure, with a predetermined interval from the structure,
Between the wall-shaped impermeable layer and the existing structure, construct a layer of a water shielding material so as to cover the base of the structure to a predetermined height,
The construction method of the management type revetment characterized by constructing as the impermeable partition revetment which integrated the said existing structure and the ground which constructed the impermeable improvement. In the revetment constructed using the existing structure, on the side of the structure on the landfill side, a sheet member that exhibits water shielding is laid along the side of the structure,
The lower part of the sheet member is subjected to a treatment for holding and fixing in the layer of the water shielding material covering the base of the structure,
The method for constructing a management-type revetment according to claim 1, wherein a treatment for improving the water-impervious property at a revetment constructed using an existing structure is performed.

Images