Sand accumulation net

Abstract

To provide a sand accumulation net allowing effect to be improved in low cost due to cost and effect consideration and a financial state for protecting human lives and property from a large tsunami of an earthquake to reduce damage in an area of a land side of a sea embankment where a number of housings are congested and in an area of a sea side where sea water abuts to an embankment.SOLUTION: Many breakwater structures are used to protect embankments. Those does not function because they are to sink by wave force. A sand accumulation net is installed in front of the embankment by installing piles to accumulate a great amount of sand. Three sets are installed at one place through successively increase those heights. Those are installed with 5 m interval and at four places. A large number of human lives will be saved as people escape to an upland during longer time to collapse the embankment through resistance of sand, the sand accumulation net, and the embankment against a large tsunami of an earthquake.SELECTED DRAWING: Figure -3

Description

Technology Areas

[0001] In order to protect the land, coastal embankments have been constructed where the land meets the sea. [Background technology]

[0002] To protect coastal embankments, wave-breaks, piers and offshore breakwaters are used, which are costly but effective; however, implementing these methods along long stretches of coastline is costly and difficult. [Patent documents]

[0003] DISCLOSURE OF THEINVENTION

[0004] When seawater rises to the T-line due to the natural force of the waves, the sand deposit net also rises, taking the sand with it. When seawater descends, the sand deposit net is heavier than the seawater and so the sand remains. This process is repeated, allowing sand to accumulate. The height is gradually increased and three sets are installed in one location. Four sets are installed, spaced 5m apart. To allow for more sand to be applied, the T-line of the coast extends out to sea. This improves the safety of the coastal embankment. Because it is inexpensive, it can be constructed on many coasts. Means to solve the problem

[0005] Confirm that there is drift sand at the T-line of the coastal embankment. To secure the sand deposit net, drive three stakes into the ground in one place and lower the middle stake slightly. Tie the sand deposit net to one of the stakes. The sand deposit net should be weather-resistant, high-strength, sink in water, and 1-4 mm in diameter. Paint it with non-toxic paint to increase its service life. Since sand accumulates naturally due to the action of waves, three sets of sand will be installed at each location, each set at a height of 5m apart. This creates a beach in front of the coastal embankment, and when there is not enough sand, it can be supplemented with recycled concrete crushed stone. This way, the T-line extends offshore. Also, if existing tetrapods are transported from the temporary storage area and placed on top of them, they can better withstand tsunamis. This construction method is inexpensive, so it can be used for many coastal embankments. Effects of the invention

[0006] The tsunami slowed the destruction of the coastal embankments, allowing many people to evacuate to higher ground. EXAMPLES

[0007] [Brief description of the drawings] [Figure 1] Current coastal cross section [Figure 2] Coastal sand deposit net longitudinal section [Figure 3] Sand deposit net construction diagram [Figure 4] Detailed view of sand deposit net [Figure 5] Detailed view of sand pile net [Explanation of symbols] Figure 1 1 H,W,L 2 L,W,L 3. Wave-breaking works Figure 2 1 Tetrapod 2. Sand Deposit Net 3-cho line 4 H, W, L 5 L, W, L Figure 3 I Sand Deposit Net 2 stakes 3 Wave direction Figure 4 1 Net diameter = 1mm 2 Net diameter = 4mm 3 Net joint rope diameter = 3mm L = 5,60m 4 Outer net rope diameter = 6mm L = 6,0mm Figure 5 1 Pile and net connection 2. Internet 3 stakes 4 Steel bar diameter = 19mm 5. Anti-rust paint and adhesive application 6 Reinforced Mortar

Claims

[Claim 1] Sand Deposit Net To make coastal embankments safer, sand can be added to the front of the embankment (beach nourishment). This will slow down the destruction of the coastal embankment in the event of a large tsunami, allowing people to escape to higher ground. Sand drift is caused by waves. This drift sand can be collected naturally little by little using a sand deposit net. By repeating this sand deposit net two or three times, sand can be added to the front of the embankment. The mesh size of the net should be 1 to 4 mm. There are three support posts, the center of which is slightly lowered, and the net is joined with string. However, there are some places where the sand does not adhere well. In those places, recycled crushed concrete can be spread and compacted to increase the strength of the embankment.

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