EZ-LOK 조인트가 적용된 주철 매립 상수도관의 지진 안전성 평가

Several ruptures and leaks of water pipes were reported in the Kyongju and Pohang earthquakes. Therefore, securing the seismic safety of water pipe facilities is critical for continuous and stable water supply. Water pipes are usually buried under the road or a fill-up ground. Therefore, the deformation by seismic waves, permanent deformation of the ground, and soil liquefaction cause the bending deformation of the water pipes. Excessive bending deformation can cause damage and leaks to the pipe joints. Therefore, the allowable deformation angle of the water pipe joints should be calculated to accurately assess the seismic safety of the water pipes for the deformation of the ground caused by the earthquake. The water pipe systems used various types of water pipes depending on the site and installation conditions. Cast iron water pipes have been in use for long, and improved products are commonly used. This study evaluated cast iron water pipes with EZ-LOK joints manufactured by Korea Iron and Steel Co., Ltd. using a four-point bending test method, and evaluated the seismic safety of buried cast iron water pipes referring to evaluation results and seismic design criteria.