一、管道连接在田间施工前,先将管道按20～30米长度采用承插式粘结方法连接好.具体做法是:先将要连接管的端部放在小焦炭火炉上或用喷灯直接加热使之软化,加热时要注意使管子不停顿地旋转以免烘焦,待管端软化后用木模扩孔(图1),L=1.0～1.5Dg,冷却3～5分钟后拔出水模,然后将要连接的另一根管的端部涂上一层薄而均匀的粘结剂插入即可(图2).承插间隙(双边间隙之和)为0.15～0.30毫米. First, the pipe connection Before the construction in the field, the first pipe by 20-30 meters length by socket bonding method to connect the specific approach is: first to connect the end of the pipe on a small coke stove or directly heated with a torch So soften, heating should pay attention to the pipe without stopping to avoid baking, to be softened after the tube with wooden mold reaming (Figure 1), L = 1.0 ~ 1.5Dg, cooling 3 to 5 minutes after pulling out the water mode , And then insert the end of the other tube to be connected with a thin, uniform adhesive (Figure 2). The insertion gap (the sum of the bilateral gaps) is 0.15-0.30 mm.