METHOD FOR PREPARING CORROSION-PROTECTIVE DRAINAGE PORT

摘要

PURPOSE: A method for preparing a drainage port useful for preventing corrosion is provided to prevent the port from being released at inner side of the drainage but to be retained closely to concrete wall body of the drainage. CONSTITUTION: The method comprises steps of forming outer concrete portion(2) by introducing concrete; injecting a specific, structural material(4) for preventing release of the drainage port to inner side of the outer concrete portion well before the inner side is cured by means of common sprayer; and spraying polyethylene material at a desired thickness over the structural material half-attached to the inner side to form a water-resistant inner layer(6). The inner layer(6) is not removed because the polyethylene material is filled into spaces of the structural material and is cured.