小管径金属给排水管道的不停水维修金属给排水管道不论是架空或者是埋地铺设，常常因有砂限或年久失修、焊缝开裂等而漏水，传统维修方法是停水换管、换配件、补焊、打卡子。采取上述方法几乎都要关闭管道控制阀门或停止用水，排净系统中余水后方可施工。往往难以关闭控制... Continuous water supply for small-diameter metal water supply and drainage pipelines The metal water supply and drainage pipelines, whether overhead or buried, often leak due to sand limitation or long-term disrepair, weld cracking, etc. The traditional maintenance method is to stop water replacement. , change parts, repair welding, playing cards. Take the above method to close the pipeline control valve or stop the water, and drain the net water in the system before construction. It is often difficult to close the control...