无论是灌注桩或在水下浇灌混凝土都需要导管。为了克服传统的法兰式导管的缺点,我们制作了插口式导管,取消法兰盘,改螺栓连接为插口连接,见图1。导管每节长2米,直径为20厘米左右,每节的一头焊一圈连接筒,当两节连接时,只需将一节的一端插入另一节的连接筒里,然后在连接筒的缝 Plumbing is required for both cast-in-place piles and concrete under water. In order to overcome the shortcomings of the traditional flanged conduit, we made a socket-type conduit, canceled the flange, and changed the bolt connection to the socket connection. See Figure 1. Each section of the catheter is 2 meters long and has a diameter of about 20 centimeters. Each section is welded at one end. When the two sections are connected, only one end of the section is inserted into the connecting section of the other section, and then the connecting tube is Sew