Disaster prevention facility for urban area of japanese archipelago or disaster prevention facility for large city of japanese archipelago

Abstract

To provide an urban disaster prevention facility by installing tsunami-resistant ceiling river levees 7 in the sea along the coastlines of Japan, such as Tokyo Bay, Ise Bay, Osaka Bay, and the northeastern coast of the Seto Inland Sea in a first objective of the present invention, and to provide land that does not require reclamation along the coastlines of Japan, such as Tokyo Bay, Ise Bay, Osaka Bay, and the Seto Inland Sea in a second objective of the present invention.SOLUTION: An urban disaster prevention device comprises a tsunami-resistant ceiling river levee with multiple openings located near coastline or in relatively shallow waters, and flap-gate type seawalls or floodgates located at the multiple openings, which allow river water to flow into the open sea through the multiple openings.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention aims to provide disaster prevention facilities for cities in the Japanese archipelago or large cities in the Japanese archipelago by installing tsunami-resistant ceiling river levees 7 near the coastline or in the sea on a relatively shallow seabed. [Background technology]

[0002] At the end of the last ice age, the coastline of the Japanese archipelago was transformed into the current coastline when Tokyo Bay, Ise Bay, Osaka Bay and the Seto Inland Sea were submerged one after another due to a sea level rise of up to 100 meters. The present invention is a related application to the earlier application for a flood prevention levee or tsunami prevention levee (Japanese Patent Application No. 2022-162288). The applicant has also filed an application for a tsunami countermeasure floating body device (Japanese Patent Application Laid-Open No. 2020-76287). Although not an invention of the present applicant, Hitachi Zosen Corporation has registered patents for floating flap gates, including Patent No. 5329452 and 33 others. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5329452 [Patent Document 2] Patent No. 5476209 [Patent Document 3] Patent No. 5529001 [Patent Document 4] Patent No. 5762882 [Patent Document 5] Patent No. 5718732 [Patent Document 6] Patent No. 5580785 [Patent Document 7] Patent No. 5631818 [Patent Document 8] Patent No. 5845025 [Patent Document 9] Patent Publication No. 5845051 [Patent Document 10] Patent No. 5718792 [Patent Document 11] Patent No. 5971956 [Patent Document 12] Patent No. 5873743 [Patent Document 13] Patent No. 5873759 [Patent Document 14] Patent No. 5883756 [Patent Document 15] Patent No. 5948206 [Patent Document 16] Patent No. 6158503 [Patent Document 17] Patent No. 6117280 [Patent Document 18] Patent No. 6235403 [Patent Document 19] Patent No. 6262608 [Patent Document 20] Patent No. 6438282 [Patent Document 21] Patent No. 6435455 [Patent Document 22] Patent No. 6382094 [Patent Document 23] Patent No. 6431401 [Patent Document 24] Patent No. 6480221 [Patent Document 25] Patent No. 6461699 [Patent Document 26] Patent No. 6652409 [Patent Document 27] Patent No. 6696681 [Patent Document 28] Patent No. 6438555 [Patent Document 29] Patent No. 6626180 [Patent Document 30] Patent No. 6856487 [Patent Document 31] Patent No. 7203710 Summary of the Invention [Problem to be solved by the invention]

[0004] The first object of the present invention is to provide urban disaster prevention facilities by installing tsunami-resistant ceiling river levees 7 in the sea along the coastlines of Japan, such as Tokyo Bay, Ise Bay, Osaka Bay, and the Seto Inland Sea along the northeastern coast. The second object of this invention is to provide land that does not require reclamation along the coastlines of Japan, such as Tokyo Bay, Ise Bay, Osaka Bay, and the Seto Inland Sea. [Means for solving the problem]

[0005] The present invention aims to provide urban disaster prevention facilities by providing a tsunami-resistant ceiling river levee 7 that has multiple openings in the sea near the coastline or a tsunami-resistant ceiling river levee 7 in the sea on a relatively shallow seabed. The urban disaster prevention device described in claim 1 is characterized by comprising a tsunami-resistant ceiling river levee with multiple openings located near the coastline or in relatively shallow waters, and flap-gate type seawalls or floodgates located at the multiple openings, which allow river water to flow into the open sea from the multiple openings. The urban disaster prevention device or metropolitan disaster prevention facility described in claim 2 is characterized by comprising an overhead river levee that does not require landfilling and that extends continuously from the adjacent riverbank of an adjacent river to the relatively shallow seabed underwater, a tsunami-resistant overhead river levee that has multiple openings and is provided from the opposite bank of the adjacent river or a nearby coastline to the open sea of ​​the overhead river levee that does not require landfilling, and flap-gate type seawalls or floodgates that are provided at the multiple openings and allow river water to flow into the open sea from the multiple openings. The urban disaster prevention device or metropolitan disaster prevention device according to claim 3 comprises an overhead river levee with openings at both ends that is installed in the sea near the coastline, an overhead river levee that does not require landfill that is installed in relatively shallow sea at both ends of the overhead river levee, a tsunami-resistant overhead river levee with multiple openings that is installed from the coast near the both end openings to the open sea of ​​the overhead river levee that does not require landfill, and flap-gate type seawalls or floodgates that are installed at the multiple openings, making the area between the overhead river levee that does not require landfill and the tsunami-resistant overhead river levee a brackish water area and allowing river water to flow into the open sea from the multiple openings of the tsunami-resistant overhead river levee. The urban disaster prevention device described in claim 4 is characterized by comprising an overhead river levee with openings at both ends and installed in the sea near the coastline, a first overhead river levee (levee) that does not require landfill and is installed in the sea in relatively shallow waters at both ends of the overhead river levee (3), a second overhead river levee (levee) that does not require landfill and is installed continuously from the adjacent riverbank of an adjacent river to the seabed in relatively shallow waters and has a first side and a side that maintains a predetermined width, and a tsunami-resistant overhead river levee (levee) that connects to the coast at both ends and has a plurality of openings installed in the open sea for both of the above-mentioned overhead river levee (levee) that does not require landfill, and flap-gate type seawalls or sluice gates installed in the plurality of openings, so that river water flows within the predetermined width and the area between the above-mentioned overhead river levee (levee) that does not require landfill and the tsunami-resistant overhead river levee (4) becomes a brackish water area and river water flows into the open sea from the plurality of openings of the tsunami-resistant overhead river levee. The urban disaster prevention device described in claim 5 is characterized by comprising two coastlines with an inland sea, two ceiling river levees that do not require landfill and that extend continuously from the adjacent riverbanks of adjacent rivers on both coastlines to the relatively shallow seabed, two ceiling river levees that are tsunami-resistant and have multiple openings that are provided in the open sea on both of the ceiling river levees that do not require landfill, and flap-gate type seawalls or floodgates that are provided in the multiple openings, making the area between both of the ceiling river levees that are tsunami-resistant and create a brackish water area and allowing river water to flow from the openings to the open sea. The urban disaster prevention device described in claim 6 is characterized by comprising two coastlines having an inland sea, both ceiling river levees with openings at both ends provided in the sea near both coastlines, both ceiling river levees 3 that do not require landfill provided in relatively shallow sea at both ends of both of the ceiling river levees 3, both ceiling river levees that do not require landfill provided in the open sea of ​​both of the ceiling river levees 3, and tsunami-resistant ceiling river levees with multiple openings provided in the open sea of ​​both of the ceiling river levees that do not require landfill, and flap-gate type seawalls or sluice gates provided at the multiple openings, forming a canal between both of the tsunami-resistant ceiling river levees and allowing river water to flow into the open sea from the multiple openings of the tsunami-resistant ceiling river levees. The urban disaster prevention device described in claim 7 is characterized by comprising an overhead river levee with openings at both ends that is installed in the sea near a coastline with a strait in the middle, an overhead river levee that does not require landfill that is installed in relatively shallow sea at both ends of said overhead river levee 3, a tsunami-resistant overhead river levee with multiple openings that is installed from the coast near the openings at both ends to the open sea of ​​said overhead river levee that does not require landfill, and flap-gate type seawalls or sluice gates that are installed at the multiple openings, and the area between said overhead river levee that does not require landfill and said tsunami-resistant overhead river levee 4 is a brackish water area and river water is allowed to flow into the open sea from the multiple openings of the tsunami-resistant overhead river levee. [Effects of the Invention]

[0006] According to the present invention, disaster prevention in cities is made possible by the use of a tsunami-resistant ceiling river levee 7 that has a plurality of openings 7a provided in the sea near the coastline. In addition, there is an overhead river levee 4 installed in the sea near the coastline, overhead river levee 5 which does not require landfill installed in the relatively shallow sea at both ends of said overhead river levee 4, and a tsunami-resistant overhead river levee 7 which has an opening 7a in the open sea of ​​said overhead river levee 5 which does not require landfill, and the area between said overhead river levee 5 which does not require landfill and said tsunami-resistant overhead river levee 7 is made into a brackish water area, and river water can be discharged into the open sea from said opening 7a of tsunami-resistant overhead river levee 7, making urban disaster prevention possible. Furthermore, by providing landfill-free ceiling river levees 5 in the relatively shallow sea at both ends of the ceiling river levees 4 and providing land 6 that does not require reclamation, it is possible to connect Honshu and Shikoku or Honshu and Kyushu by land. [Brief explanation of the drawings]

[0007] [Figure 1] shows the current coastline and the coastline during the glacial period of the Japanese archipelago. [Figure 2] 1 shows an example of an overhead river levee 4 provided in the sea near the coastline or in the sea on a relatively shallow seabed, an overhead river levee 7 for tsunami protection, and an overhead river levee 5 that does not require landfill and is provided on a relatively shallow seabed. [Figure 3a] shows a current map of Osaka Bay. [Figure 3b] A current map of Tokyo Bay is shown. [Figure 3c]A current map of Ise Bay is shown. [Figure 3d] shows a current map of Tokyo's reclaimed land. [Figure 3e] shows a current map of the reclaimed land in Yokohama. [Figure 4a] shows a current map from Kyushu to Osaka Bay, showing land that does not need to be reclaimed in the Kaimon Straits. [Figure 4b] shows a current map of the Seto Inland Sea. [Figure 5] shows a current map of the Tohoku region, illustrating the tsunami-resistant levee rivers near the coastline. [Figure 6] 1 is a perspective view of an embodiment of the embankment wall and embankment reinforcement member of the present invention. [Figure 7] shows a dike wall in which the dike wall and dike reinforcement members are fixed by dike fixing vertical columns. DETAILED DESCRIPTION OF THE INVENTION

[0008] Figure 1 shows the current coastline of the Japanese archipelago and the coastline during the Ice Age. At the end of the last ice age, the coastline of the Japanese archipelago was transformed into the current coastline when Tokyo Bay, Ise Bay, Osaka Bay and the Seto Inland Sea were submerged one after another due to a sea level rise of up to 100 meters. FIG. 2 shows an example of an overhead river levee 4 provided near the coastline or in the sea on a relatively shallow seabed, an overhead river levee 7 for tsunami protection, and an overhead river levee 5 that does not require landfill and is provided on a relatively shallow seabed. A plurality of openings, such as known flap gate type seawalls or floodgates, are provided to prevent tsunamis from reaching the coastline 1. Figure 2a shows an embodiment of a tsunami-resistant ceiling river levee 7 with multiple openings 7a near the coastline, Figure 2b shows an embodiment of an ceiling river levee 4 with openings at both ends, a landfill-free ceiling river levee 5 provided in the sea from both ends of the openings in a relatively shallow seabed, and a tsunami-resistant ceiling river levee 7 provided in the open sea from the landfill-free ceiling river levee 5, Figure 2d shows an embodiment of an ceiling river levee 4 with openings at both ends provided in the sea near the coastline with a strait in the middle, a landfill-free ceiling river levee 5 provided in the sea in a relatively shallow seabed at both ends of the ceiling river levee 4, and a tsunami-resistant ceiling river levee 7 with multiple openings 7a provided in the open sea from the landfill-free ceiling river levee 5, and Figure 2d shows an embodiment of a landfill-free ceiling river levee 5 provided in the sea in a relatively shallow seabed from the adjacent riverbank of an adjacent river, and a tsunami-resistant ceiling river levee 7 with multiple openings 7a in the open sea from the landfill-free ceiling river levee 5. Figure 2e shows an embodiment in which a canal is formed between two tsunami-resistant overhead river dikes 7, which are provided in the open sea from both ends of adjacent riverbanks on one coastline that has an inland sea such as the Seto Inland Sea, and an overhead river dike 4 with openings at both ends nearby, and an overhead river dike 5 with openings at both ends nearby that is provided in the open sea from both ends of the opening and does not require landfill, and an overhead river dike 7, which is provided in the open sea from both ends of the opening and does not require landfill, near the other coastline, and an overhead river dike 4 with openings at both ends nearby that is provided in the open sea from both ends of the opening and does not require landfill, and does not require landfill, and an overhead river dike 7, which is provided in the open sea from both ends of the opening and does not require landfill, and connects to the coastline. Figure 2f shows an embodiment in which an overhead river levee 4 with openings at both ends is provided near one coastline with an inland sea, an overhead river levee 5 that does not require reclamation is provided in the sea in a relatively shallow seabed from both ends of the openings, a tsunami-resistant overhead river levee 7 that is provided in the open sea from the above-mentioned overhead river levee 5 that does not require reclamation and connects to the coastline, and a tsunami-resistant overhead river levee 7 with multiple openings 7a provided near the other coastline, with a canal between both tsunami-resistant overhead river levee 7. Figure 2g shows an embodiment in which an overhead river levee 5 that does not require reclamation is provided in the sea in a relatively shallow seabed from adjacent riverbanks of both adjacent rivers on a coastline with an inland sea, and a tsunami-resistant overhead river levee 7 that is provided in the open sea from the opposite riverbanks of both of the above-mentioned overhead river levee 5 that does not require reclamation is provided between the two overhead river levee 5 that does not require reclamation, and river water flows into the open sea from the multiple openings 7a of the above-mentioned overhead river levee 7.

[0009] Figure 3 explains specific examples of tsunami-resistant ceiling river levees 7 installed underwater on current maps of reclaimed land in Osaka Port, Tokyo Bay, and Ise Bay metropolises, and shows an example including a ceiling river levee 4 with openings at both ends installed underwater near the coastline, ceiling river levees 5 that do not require landfill installed at both ends of the ceiling river levee 4 down to relatively shallow waters, a tsunami-resistant ceiling river levee 7 with multiple openings 7a installed in the open sea at the ceiling river levee 5 that does not require landfill, and flap-gate type seawalls or sluice gates installed at the multiple openings 7, with the area between the ceiling river levee 5 that does not require landfill and the tsunami-resistant ceiling river levee 7 being a brackish water area, including the coastline 1 and river 2. This shows a specific example of multiple tsunami-resistant overhead river levees 7 installed in the relatively shallow seabed at Kobe, Osaka, and Kansai Airport in Osaka Bay.This example shows an overhead river levee 4 near the coastline connecting the coastline side of Kobe Airport and Kansai Airport, an overhead river levee 5 that does not require landfilling and is installed in the relatively shallow seabed connecting the open sea side of the airport, and a tsunami-resistant overhead river levee 7 that has multiple openings 7a in the open sea for the overhead river levee 5 that does not require landfilling.Current maps of Osaka Port, Tokyo Bay, and Ise Bay are shown. Even in Ise Bay, disaster prevention for large cities is possible with an embodiment that includes an overhead river levee 4 that connects the coastline side of Chubu Centrair International Airport and extends near the coastline up to Matsusaka, an overhead river levee 5 that does not require landfilling and extends to relatively shallow waters that connects the coastline near Chubu Centrair International Airport with the coastline near Matsusaka, and an overhead river levee 7 that is tsunami-resistant and has multiple openings 7a in the open sea of ​​the overhead river levee 5 that does not require landfilling. An embodiment is shown in which Tokyo Bay is equipped with an overhead river levee 4 from the coastline of Urayasu to Kisarazu, an overhead river levee 4 from the coastline of Urayasu to Yokosuka, an overhead river levee 5 that does not require landfill and is provided from both ends b of the overhead river levee 4 at Kisarazu and Yokosuka to the relatively shallow sea, and a tsunami-resistant overhead river levee 7 that connects to the coastline of Kisarazu and Yokosuka and has multiple openings 7a in the open sea of ​​the overhead river levee 5 that does not require landfill. Figure 2c shows an embodiment of an overhead river levee 4 with openings at both ends provided near the coastline, an overhead river levee 5 that does not require landfill provided from both ends of the openings into the relatively shallow seabed, and an overhead river levee 7 that is tsunami-resistant and provided in the open sea from the overhead river levee 5 that does not require landfill, which is provided on reclaimed land continuously from the adjacent riverbanks of a plurality of adjacent rivers to the relatively shallow seabed, and an overhead river levee that is tsunami-resistant and has multiple openings 7a provided on the open sea side of the overhead river levee that does not require landfill, and flap-gate type seawalls or floodgates provided at the multiple openings, which allow river water to flow into the open sea from the multiple openings. An example is shown that also includes a coastline 1 and a river 2 that drains the river water of an adjacent river into the open sea. In the reclaimed land in Tokyo, Yokohama, and Chiba shown in Figure 4, for example, a first covered river levee 5 that does not require landfilling is provided, which extends from the adjacent riverbanks of the Arakawa River and the Sumida River in Tokyo or from the nearby coastline to the relatively shallow seabed; an covered river levee 4 near the coastline from the opposite bank of the Sumida River to the eastern bank of the Tsurumi River; a second covered river levee 4b that does not require landfilling and which has sides that maintain a specified width with the sides of the first covered river levee 4a that does not require landfilling; and a tsunami-resistant covered river levee 7 that is provided parallel to the open sea of ​​both covered river levee 5a and 5b that does not require landfilling and which connects both ends to the coastline, allowing river water to flow within the specified width. This makes it possible to realize land 6 that does not require landfilling from Tokyo to Yokohama. For example, in the case of land reclamation in Tokyo, if an overhead river levee 5 that does not require landfilling is implemented, extending from the adjacent riverbanks or nearby coastlines of the neighboring Arakawa and Sumida Rivers to the relatively shallow underwater seabed, it will be possible to create land 6 that does not require landfilling other than the reclaimed land.In the case of the neighboring Sumida and Tama Rivers, if an overhead river levee 5 that does not require landfilling is implemented, extending from the adjacent riverbanks or nearby coastlines of the neighboring rivers to the relatively shallow underwater seabed, it will be possible to create land 6 that does not require landfilling other than the reclaimed land. In Yokohama, if an overhead river levee (5) that does not require landfilling is constructed along the adjacent riverbanks or nearby coastlines of the Tama River and the Tsurumi River, extending from the adjacent riverbanks to the relatively shallow underwater seabed, it would be possible to create land (6) that does not require landfilling outside of reclaimed land. Furthermore, if an overhead river levee (5) that does not require landfilling is constructed connecting the western bank of the Tsurumi River or the nearby coastline with the coastline near Yokosuka, extending to the relatively shallow underwater seabed, it would also be possible to create land (6) that does not require landfilling outside of reclaimed land. The rivers in Osaka Bay are complex, but similar construction is possible. In Akashi, an overhead river levee (5) that does not require landfilling, extending from the eastern bank of the Kakogawa River to the coastline at Akashi's eastern end to the relatively shallow underwater seabed, and an overhead river levee (7) that is resistant to tsunamis and has multiple openings (7a) to the open sea from the overhead river levee (5) that does not require landfilling, would enable disaster prevention and landfilling outside of reclaimed land in Akashi. Alternatively, if a tsunami-resistant ceiling river levee 7 is constructed in the sea near the coastline in Hiroshima from Iwakuni to Kure (Figure 4b) in Figure 2a, it will be possible to provide urban disaster prevention facilities not only for Hiroshima but also from Iwakuni to Kure.

[0010] One example of urban disaster prevention facilities on a single coastline such as Tokyo Bay, Osaka Bay, Ise Bay, and the Tohoku coast includes an overhead river levee 5 that does not require landfilling and extends continuously from the adjacent riverbanks of multiple adjacent rivers to the relatively shallow seabed underwater, a tsunami-resistant overhead river levee that is provided on the open sea side of the overhead river levee that does not require landfilling and has multiple openings 7a, and flap-gate type seawalls or floodgates that are provided at the multiple openings, allowing river water to flow into the open sea from the multiple openings. This example also includes coastline 1 and river 2, which drain river water from adjacent rivers into the open sea, and an embodiment in which a tsunami-resistant overhead river levee 7 is provided in the sea near the coastline, and tsunami-resistant overhead river levee 7 is provided in the sea near the coastline, and tsunami-resistant overhead river levee 7 has openings 4b at both ends and openings 7a. In this embodiment, the applicant's tsunami countermeasure floating device (JP Patent Publication No. 2020-76287) can be implemented as a tsunami countermeasure offshore to weaken tsunamis, and the guiding float member is used for offshore wind power generation. As a final tsunami countermeasure, a known floating flap gate is used in the opening 4b. The floating structure is used for offshore wind power generation. As a final measure against tsunamis, a known floating flap gate is used in the opening 4b.

[0011] In the example of the urban disaster prevention device for two coastlines with a strait in the middle of the Kaimon Strait, etc. The system is characterized by comprising two coastlines 1 of a strait, an overhead river levee 4 provided in the sea near the two coastlines 1 and having openings at both ends, an overhead river levee 5 that does not require landfill and is provided in relatively shallow waters at both ends of the overhead river levee 4, an overhead river levee 7 that is connected to the coast near the openings at both ends and is provided in the open sea of ​​the overhead river levee 5 that does not require landfill, and flap-gate type seawalls or floodgates provided at the multiple openings 7a, allowing river water to flow into the open sea from the multiple openings 7a. For example, in the Kanmon Straits, there is an overhead river levee 4 that is installed in the sea near the coastline from the coastal side of Kitakyushu Airport and connects to the sea near the coastline of Ube City, and overhead river levee 5 that does not require landfill and is installed in relatively shallow waters on both ends of the overhead river levee 4, and an overhead river levee 7 that is a tsunami prevention levee installed in the open sea of ​​the overhead river levee 5 that does not require landfill, and flap gate type seawalls or floodgates installed in the multiple openings 7a that allow river water to flow into the open sea from the multiple openings 7a. Also, on the Sea of ​​Japan side of the Kanmon Straits, there is an overhead river levee 4 that is provided in the sea near the coastline of Fukutsu City, Fukuoka Prefecture, and connects to the sea near the coastline of Cape Kanda in Yamaguchi Prefecture, and there are overhead river levees 5 that do not require landfill that are provided in relatively shallow waters on both ends of the overhead river levee 4 and on the relatively shallow seabed, and there is a tsunami-resistant overhead river levee 7 that is provided in the open sea on the overhead river levee 5 that does not require landfill, and there are flap-gate type seawalls 8 or sluice gates provided at the multiple openings 7a, and river water flows into the open sea from the multiple openings 7a. The realization of the above-mentioned land that does not require reclamation6 will make it possible to unify Honshu and Kyushu.

[0012] In this example of the urban disaster prevention equipment for two coastlines 1 having inland seas such as the Seto Inland Sea, An embodiment is also possible in which two coastlines 1 having an inland sea have an overhead river levee 5 that does not require landfill and is installed in the sea on a relatively shallow seabed from the adjacent riverbank of an adjacent river on one coastline 1, a tsunami-resistant overhead river levee 7 that is installed parallel to the open sea side of the above-mentioned overhead river levee 5 that does not require landfill and has multiple openings 7a connecting it to the opposite bank of the adjacent riverbank or a nearby coast, and a tsunami-resistant overhead river levee 7 with multiple openings installed in the sea near the other coastline 1, and a canal is formed between both of the above-mentioned tsunami-resistant overhead river levee 7, and river water is allowed to flow from the openings 7a into the open sea. An embodiment is also possible in which a landfill-free ceiling river levee 5 is provided in the sea on a relatively shallow seabed that continues from the adjacent riverbank of an adjacent river on one coastline or from a nearby coastline, a tsunami-resistant ceiling river levee 7 is provided in the open sea from the landfill-free ceiling river levee 5 and connects to the opposite bank of the adjacent riverbank or a nearby coast, and a tsunami-resistant ceiling river levee 7 is provided in the sea near the other coastline and connects to the opposite bank of the adjacent riverbank or a nearby coast, with multiple openings 7a at both ends that connect to the coastline, and a canal is formed between the tsunami-resistant ceiling river levee 7 on both coastlines, and river water is allowed to flow into the open sea from the openings 7a. For example, in the Kurushima Kaikyo Bridge, in the embodiment shown in Figure 2f, there is an overhead river levee 5 that does not require landfill and is installed in the sea on a relatively shallow seabed that connects the western coastline of the west bank of the Ashida River on the Honshu side with the eastern coastline of the Numata River, continuing into the Kurushima Strait, and a tsunami-resistant overhead river levee 7 that is installed in the open sea from the above-mentioned overhead river levee 5 that does not require landfill and connects to the opposite bank of the adjacent river bank or the nearby coast, and on the Shikoku side there is a tsunami-resistant overhead river levee 7 with multiple openings 7a that is installed in the sea near the coastline near Imabari, and a canal is formed between the tsunami-resistant overhead river levee 7 on both coastlines, and river water is allowed to flow into the open sea from the above-mentioned openings 7a. For the Setouchi Ohashi Bridge, in the embodiment shown in Figure 2e, it is also possible to have an overhead river levee 5 that does not require landfill and is installed in the sea on a relatively shallow seabed on the Honshu side, continuing from the adjacent riverbank of the adjacent river or the nearby coastline, up to an island near the Setouchi Ohashi Bridge, and a tsunami-resistant overhead river levee 7 that is installed parallel to the open sea side of the above-mentioned overhead river levee that does not require landfill and connects to the opposite bank of the adjacent riverbank or the nearby coast, and on the Shikoku side, an overhead river levee 5 that does not require landfill and is installed in the sea up to an island near the Setouchi Ohashi Bridge, and a tsunami-resistant overhead river levee 7 that is installed on the open sea side of the above-mentioned overhead river levee 5 that does not require landfill and connects to the opposite bank of the adjacent riverbank or the nearby coast. A canal is formed between both tsunami-resistant overhead river levee 7, and river water is allowed to flow into the open sea from the opening 7a. Alternatively, in the embodiment of Figure 2b for two coastlines, there are two coastlines having an inland sea, and both covered river levees 4 provided in the sea near both coastlines and having openings at both ends, and both covered river levees 5 that do not require landfill provided in the relatively shallow sea at both ends of both of the covered river levees 4, and both tsunami-resistant covered river levees 7 that have multiple openings provided to the open sea of ​​the covered river levees 5 that do not require landfill, and flap-gate type seawalls or sluice gates provided at the multiple openings, and a canal is provided between both of the tsunami-resistant covered river levees 7, and river water flows into the open sea from the multiple openings 7a of the tsunami-resistant covered river levees 7. Another example of two coastlines with an inland sea is the embodiment shown in Figure 2g, which includes an enclosed river levee 5 that does not require landfilling and extends to the relatively shallow seabed, connecting the adjacent riverbank or nearby coast of a river adjacent to one coastline with the adjacent riverbank or nearby coast of the other coastline, and an enclosed tsunami-resistant river levee 7 that connects the opposite riverbank or nearby coastline in the open sea to the enclosed river levee 5 that does not require landfilling. The enclosed tsunami-resistant river levee 7 has multiple openings in the open sea, and is characterized by having flap-gate-type seawalls or sluice gates installed in the multiple openings 7a, allowing river water to flow into the open sea from the multiple openings. In this example, Honshu and Shikoku are connected by land that does not require landfilling, and there is no canal connecting Kansai and Shikoku. If this example is implemented in the Seto Inland Sea, Honshu and Shikoku will be connected by land due to land that does not need to be reclaimed.

[0013] Figure 6 shows a perspective view of the embankment wall 12 and the embankment wall reinforcement member 13, Figure 6a shows a perspective view of the embankment wall 12 having a vertical wall portion 12b at the other end of a horizontal connecting rod 12a which has a vertical tube 12c that penetrates and fits into a thick vertical square column 11 fixed to the embankment, and Figure 6b shows a perspective view of the embankment wall 12 having a vertical wall portion 12b at the other end of a vertical connecting plate 12a which has two vertical tubes 12c that penetrate and fit into two thick vertical circular columns 11 fixed to the embankment. Figure 6c shows an L-shaped embankment wall reinforcing member 13 having a vertical tube 13c that penetrates and fits between a thick embankment fixing vertical square column or two embankment fixing vertical circular columns 11 and is provided with a reinforcing portion 13b; Figure 6d shows a U-shaped embankment wall reinforcing member 13 having a vertical tube 13c that penetrates and fits between a thick embankment fixing vertical square column 11 and is provided with a reinforcing portion 13b; Figure 6e shows a U-shaped embankment wall reinforcing member 13 having a vertical tube 13c that penetrates and fits between a thick embankment fixing vertical square column 11 and is provided with a reinforcing portion 13b; Figure 6f shows a U-shaped embankment wall reinforcing member 13 having a vertical tube 13c that penetrates and fits between two embankment fixing vertical circular columns 11 and is provided with a reinforcing portion 13b; and Figure 7g shows a plate-shaped embankment wall reinforcing member having a vertical tube 13c that penetrates and fits between two embankment fixing vertical circular columns 11 and is provided with a reinforcing portion 13b.

[0014] Figure 7 shows a structure fixed in a plane by two thick vertical columns or vertical square columns 11 for fixing the embankment, and Figure 7a shows two thick vertical columns 11 for fixing the embankment fitted with earthquake-resistant devices, an embankment wall 12 having a lower horizontal connecting plate 12a at one end which has a vertical pipe 12c that passes through and fits into the thick vertical columns 11 for fixing the embankment and a vertical wall portion 12c at the other end, and L-shaped embankment wall reinforcing members 13 above and below the horizontal connecting plate 12a of the embankment wall 12 which have vertical pipes 13c that pass through and fit into the two thick vertical columns 11 for fixing the embankment and have reinforcing portions 13b that reinforce the embankment wall 12c. The height of the embankment wall 12 varies depending on whether it is a landfill-free covered river levee 5 or a tsunami-resistant covered river levee 7, which is equipped with a bottom-mounted offshore wind power generation member 16 on top of the upper L-shaped embankment wall reinforcement member and has a vertical pipe 16 at one end that penetrates the thick embankment-fixing vertical column 11. In the case of a landfill-free covered river levee 5 installed in relatively shallow seas, the height above sea level is the same as that of the covered river levee 4. Figure 7b shows two thick vertical columns 11 fixed to the embankment with earthquake-resistant devices, an embankment wall 12 having a bottom horizontal connecting plate 12 at one end with a vertical pipe 12c that penetrates and fits into the thick vertical columns 11 fixed to the embankment at the other end, an H-shaped embankment wall reinforcing member 13 having a vertical pipe 13c that penetrates and fits into the two thick vertical columns 11 fixed to the embankment and equipped with a reinforcing portion 13b and reinforcing the embankment wall 12c, provided on the bottom horizontal connecting plate 12a of the embankment wall 12, and a plate-shaped embankment wall reinforcing member 13 placed on top of the H-shaped embankment wall reinforcing member 13. A bottom-mounted offshore wind power generation member 16 equipped with a vertical pipe 16 is provided on top of the plate-shaped embankment wall reinforcing member 13. Figure 7c shows the state in which the embankment wall 12, which is fixed in a plane to two thick vertical cylinders 11 for fixing the embankment, is connected along the coastline by connecting members 14, and bottom-mounted offshore wind power generation becomes possible by the rotor blades 16a of the bottom-mounted offshore wind power generation member 16. In addition, openings are also made in some of the connecting members 14 to allow river water to flow into the open sea. The space between the H-shaped embankment wall reinforcement members 13 is provided with marine freight railways in different directions, making it possible to transport cargo using ceiling river levees or tsunami-resistant ceiling river levees built near the coastlines of the Japanese archipelago, and it is also possible to build an over-sea walkway on top of the plate-stripe embankment wall reinforcement members 13. [Explanation of symbols]

[0015] 1. Coastline 2. Rivers 3 Riverbank 4. Ceiling River Levee 5. Tensuke River Levee No Need for Landfill 6. Land that does not require reclamation 7. Tsunami-proof ceiling river levees 7a aperture 11 Thick embankment fixing pillar 12 Embankment Wall 13 Embankment wall reinforcement members 14 Joint materials 16 Bottom-mounted wind power generation components

Claims

1. An urban disaster prevention facility that comprises a tsunami-resistant ceiling river levee with multiple openings located near the coastline or in relatively shallow waters, and flap-gate type seawalls or floodgates installed at the multiple openings, allowing river water to flow into the open sea from the multiple openings.

2. An urban disaster prevention facility or metropolitan disaster prevention facility comprising: an overhead river levee that does not require landfilling and that extends continuously from the adjacent riverbanks of adjacent rivers to the relatively shallow seabed; a tsunami-resistant overhead river levee that has multiple openings and is provided from the opposite bank of the adjacent river or the nearby coastline to the open sea of ​​the overhead river levee that does not require landfilling; and flap-gate type seawalls or floodgates provided at the multiple openings, allowing river water to flow into the open sea from the multiple openings.

3. An urban disaster prevention facility or metropolitan disaster prevention device comprising: an overhead river levee with openings at both ends that is provided in the sea near the coastline; an overhead river levee that does not require landfill that is provided in relatively shallow sea at both ends of the overhead river levee; a tsunami-resistant overhead river levee with multiple openings that are provided from the coast near the both end openings to the open sea of ​​the overhead river levee that does not require landfill; and flap-gate type seawalls or floodgates that are provided at the multiple openings, wherein the area between the overhead river levee that does not require landfill and the tsunami-resistant overhead river levee is a brackish water area and river water is allowed to flow into the open sea from the multiple openings of the tsunami-resistant overhead river levee.

4. a first landfill-free ceiling river levee provided in the sea at both ends of the ceiling river levee in relatively shallow water; a second landfill-free ceiling river levee provided continuously from the adjacent riverbank of an adjacent river to the relatively shallow seabed in the sea and having a first side and a side that maintains a predetermined width; a tsunami-resistant ceiling river levee connected to the coast at both ends and having a plurality of openings provided in the open sea on both of the landfill-free ceiling river levee levee; and flap-gate type seawalls or floodgates provided at the plurality of openings, wherein river water flows through the predetermined width and the area between the landfill-free ceiling river levee and the tsunami-resistant ceiling river levee 4 becomes a brackish water area, and river water flows into the open sea from the plurality of openings in the tsunami-resistant ceiling river levee.

5. An urban disaster prevention device comprising: two coastlines with an inland sea; two ceiling river levees that do not require landfilling, which extend continuously from the adjacent riverbanks of adjacent rivers on both coastlines to the relatively shallow seabed; two ceiling river levees that are tsunami-resistant and have a plurality of openings that are provided from the opposite bank of the adjacent rivers or nearby coastlines to the open sea of ​​both ceiling river levees that do not require landfilling; and flap-gate type seawalls or floodgates provided at the plurality of openings, which create a brackish water area between both ceiling river levees and allow river water to flow from the openings to the open sea.

6. An urban disaster prevention facility comprising an overhead river levee that does not require landfilling and is installed in the seabed of a relatively shallow depth, continuous with both banks of multiple rivers on one coastline of two coastlines that share an inland sea; a tsunami-resistant overhead river levee that is installed parallel to the upper sea side of the overhead river levee that does not require landfilling; a tsunami-resistant overhead river levee with multiple openings on the other coastline; and flap-gate type seawalls or floodgates installed at the multiple openings, allowing river water to flow into the open sea from the multiple openings.

7. An urban disaster prevention device comprising: an overhead river levee with openings at both ends, which is provided in the sea near a coastline with a strait in the middle; an overhead river levee that does not require landfill, which is provided in relatively shallow sea at both ends of said overhead river levee 3; a tsunami-resistant overhead river levee with a plurality of openings provided from the coast near the openings at both ends to the open sea of ​​said overhead river levee that does not require landfill; and flap-gate type seawalls or floodgates provided at said plurality of openings, wherein the area between said overhead river levee that does not require landfill and said tsunami-resistant overhead river levee 4 is a brackish water area and river water is allowed to flow into the open sea from said plurality of openings in the tsunami-resistant overhead river levee.

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