STRUCTURAL STEEL CASING, RETAINING WALL, CONSTRUCTION METHOD THEREOF, AND CONSTRUCTION METHOD FOR LEVEE MAINTENANCE AND ROAD EXPANSION

摘要

The present invention relates to a steel casing retaining wall structure, a construction method therefor and a construction method for maintenance of river levees and road widening using the same. The construction method includes the steps of: (a) mounting inner and outer wall casings (20,21) of a leading end part which have predetermined length and height in a retaining wall mounting position; (b) excavating the ground between the leading-end inner and outer casings (20,21) while removing excavated soil to the outside, and simultaneously driving the inner and outer casings (20,21) to an excavation bottom surface (50) under their own weight; (c) mounting inner and outer casings (30,31) of an intermediate connection part which have the same shape and length onto the top of the leading-end inner and outer casings (20,21) and connecting the joints after excavation to a certain depth which is less than the height of the leading-end inner and outer casings (20,21); and (d) excavating the ground between the leading-end inner and outer casings (20,21) again and simultaneously sinking and digging an inner and outer casing tube (10) to the excavation bottom surface (50) after the connection between the inner and outer casings (20,21,30,31) of the leading end part and the intermediate connection part is completed.