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一种延长水管寿命的新方法已在民主德国应用于管道检修工作中。水管清洗后,将一双层纺织软管插进去,在双层软管间充气,再在软管外壁与水管内壁间灌进砂浆,经72小时凝
A new method to extend the life of pipes has been used in pipeline repairs in Democracy. After the water pipe was cleaned, a double-layer textile hose was inserted into the double-layer hose, and the mortar was filled between the outer wall of the hose and the inner wall of the water pipe. After 72 hours of coagulation