ENGINEERING FIBER FOR SOFT GROUND OF DREDGING OPERATIONS AND INSTALLATION METHOD OF IT

摘要

Geosynthetics for dredging the soft ground and the installation method of the geosynthetics for dredging the soft ground are provided to shorten a period of reclamation work by moving seawater below geosynthetics upward using guide holes and settling down geosynthetics having the larger specific gravity than seawater quickly, and to install geosynthetics easily and to cut down on installation expenses by loading a floating bed with geosynthetics and approaching to the sea, tensioning a compulsory floater coupled with the floating bed and installing geosynthetics. Geosynthetics(100) for dredging the soft ground contain non-woven fabrics(120) formed in a single layer and provided with many guide holes(122) which are perforated on the front of the non-woven fabrics to guide seawater to move upward when the geosynthetics are submerged on the surface of seawater and formed in the smaller size than the particle size of soft soil and sand to partition the lower soft soil and the upper sand, and a connector(140) coupled to the edge of the non-woven fabrics and bound up with a rope to prevent the movement and separation of the geosynthetics. An installation method of geosynthetics for dredging the soft ground comprises the steps of: assembling a temporary factory for sealing up geosynthetics; unrolling the geosynthetics and sealing up widthwise to have the larger area than the inside area of earthing materials; attaching connectors to the edge of the geosynthetics at 3-meter intervals; manufacturing a floating bed using many high hardness Styrofoam to be spaced out from the surface of seawater; installing a compulsory floater on the left side of the floating bed and connecting many ropes to the right part of the compulsory floater at regular intervals; placing geosynthetics on the top of the floating bed in zigzags and launching the floating bed; connecting ropes to the connectors exposed to the top of the geosynthetics, pulling the other end of the rope in the opposite direction to the moving direction of the compulsory floater and fixing the left part of the geosynthetics; moving the floating bed and the compulsory floater in the right direction by pulling the ropes connected to the compulsory floater using a main winch and an auxiliary winch, spreading the geosynthetics placed on the floating bed and covering up the surface of sweater completely; and settling down the geosynthetics vertically.