REINFORCEMENT STRUCTURE FOR BANKING

摘要

PROBLEM TO BE SOLVED: To suppress and prevent the deformation or collapse of a banking body from a complex disaster of liquefaction and tsunami.SOLUTION: The reinforcement structure of banking includes: a double cofferdam steel sheet pile wall comprising steel sheet piles 1, 1 configured to penetrate the banking from a crown 22 of a banking 20, buried in a foundation 10 under the banking, and extended in two rows along the continuous direction of the banking; and a graveled lane 2 configured to penetrate infilling soil 3 in the double cofferdam steel sheet pile wall, and disposed to the foundation under the banking. The top face of the infilling soil is disposed at a position lower than that of the crown. Furthermore, the reinforcement structure of the banking includes: a connecting material 4 for connecting the steel sheet piles in two rows to each other over the infilling soil in the double cofferdam steel sheet pile wall; a water shield sheet 5 covering the top face of the infilling soil; a foundation rubble layer 6 formed on the connecting material and the waster shield sheet; and a water retaining layer 7 formed on the foundation rubble layer and including therein a water collection pipe 7a extended along the continuous direction of the banking. The graveled lane is connected via an opening disposed in the water shield sheet to the foundation rubble layer, and the water collection pipe is connected to a drainage structure to the outside of the double cofferdam steel sheet pile wall.