Fixed type structure unit for restoring lost sand, structure and restoring method

Abstract

The present invention relates to a fixed type structure unit for restoring lost sand, a structure and a restoring method. The lost sand is restored using the Venturi effect by providing a fixed type cover structure unit underwater to restore lost sand due to erosion. Both end parts in a length direction are open and are provided with an inlet part and an outlet part respectively, an erosion part is provided to be open in a bottom part, the height of the cross section is arranged to become higher towards the inlet part along the length direction, and a hollow part through which water flows is provided integrally inside the fixed type cover structure unit.

1 . A fixed type structure unit (U) for restoring lost sand which is installed under water to restore sand lost due to coastal erosion or riverside erosion, the fixed type structure unit (U) comprising:
 an inlet part ( 10 ) and an outlet part ( 20 ) which are respectively disposed at both open end portions in the length direction; and   an erosion part ( 30 ) which is formed at a lower part, to be opened and has a cross section which becomes higher toward the inlet part ( 10 ) in the length direction,   wherein a hollow part (H) is disposed integrally inside the fixed type cover structure unit (U) to restore lost sand using the Venturi effect.   
     
     
         2 . The fixed type structure unit according to  claim 1 , wherein the fixed type cover structure unit (U) comprises a pair of outer wall parts ( 40 ,  40 ′) disposed in the length direction and a cover part ( 50 ) for covering upper portions of the outer wall parts ( 40 ,  40 ′). 
     
     
         3 . The fixed type structure unit according to  claim 1 , wherein the outlet part ( 20 ) of the fixed type cover structure unit (U) has an outflow induction part ( 21 ) disposed at an end portion thereof to have a predetermined height, and the inlet part ( 10 ) of the fixed type cover structure unit (U) has an inflow induction part ( 11 ) formed to be inclined outwardly and downwardly in the length direction. 
     
     
         4 . The fixed type structure unit according to  claim 1 , wherein the fixed type cover structure unit (U) has loss preventing parts ( 60 ,  60 ′) vertically formed at both width direction ends in the length direction. 
     
     
         5 . The fixed type structure unit according to  claim 1 , wherein the cross section of the hollow part (H) is formed to have a curvature, and a screw groove ( 70 ) is formed on the inner surface of the fixed type cover structure unit (U) so that the hollow part (H) has a screw shape. 
     
     
         6 . The fixed type structure unit according to  claim 1 , wherein the fixed type cover structure unit (U) has a plurality of wire holes ( 80 ) through which induction wires (W) penetrate. 
     
     
         7 . The fixed type structure unit according to  claim 1 , wherein a sluice ( 90 ) is disposed at the outlet part ( 20 ) of the fixed type cover structure unit (U) to be opened and closed by a flow of the running water. 
     
     
         8 . A fixed type structure (S) for restoring lost sand which is installed under water to restore sand lost due to coastal erosion or riverside erosion, wherein the fixed type cover structure units (U) according to  claim 1  are continuously arranged to be parallel in the length direction. 
     
     
         9 . A method (M) for restoring lost sand due to coastal erosion or riverside erosion comprising the steps of:
 (S 100 ) selecting a restoration position of the coast or the riverside due to erosion;   (S 200 ) forming a fixed type structure ( 5 ) by arranging the fixed type cover structure units (U) according to  claim 1 ; and   (S 300 ) restoring lost sand using the Venturi effect by the fixed type structure (S).   
     
     
         10 . The method according to  claim 9 , wherein the structure forming step (S 200 ) comprises the steps of
 (S 210 ) manufacturing the fixed type cover structure units (U);   (S 220 ) adjusting the seabed at the position where the fixed type structure (S) will be installed; and   (S 230 ) continuously arranging the fixed type cover structure units (U) to be parallel in the length direction.   
     
     
         11 . The method according to  claim 9 , wherein the lost sand restoring step (S 300 ) comprises the steps of:
 (S 310 ) making the running water flow into the inlet part ( 10 ) of the fixed type cover structure unit (U);   (S 320 ) eroding sand of the erosion part ( 30 ) by the running water;   (S 330 ) discharging the eroded sand and the running water to the outlet part ( 20 ); and   (S 340 ) accumulating the eroded sand.