SCOUR COUNTERMEASURES USING GEOBAG AND AGGREGATES

摘要

A scour protection method of a geobag using aggregate as filler is provided to execute construction work eco-friendlily and economically by using recycled aggregate as filler, and to increase the stability of a bridge by preventing the outflow of riverbed particles and reducing the destruction of a scour protection. A sour protection method of a geobag using aggregate as filler comprises the steps of: setting up the size of a geobag according to site conditions such as the depth of water, the speed of a current, the quantity of flow, etc. and the dimensions of a pier; installing the geobag around a pier deeply to bear external water pressure, draining off the inside water and installing a cofferdam to prevent the inflow of water; digging the inside ground of the cofferdam mechanically and refilling up; leveling and tamping the bottom of the pit-excavated ground; filling up a geobag(1) made of geotextile with filler such as sand or aggregate(3) to 70~80 % of the volume of the geobag; sealing up the geobag filled with aggregate to prevent the outflow of aggregate; installing the geobags around a foundation(7) of a scoured pier(5) in multilayer using a hydraulic truck crane; and removing the cofferdam and leveling up the circumference of a site.