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一、新法施工的启示近年来,在国外排水管道工程施工中,兴起了一类“扫描式”新施工法,如坑槽法(法,图1)、沉板法(简易土止法,图2)、新工法等。它们的共同特点归纳起来是:(1)开槽施工,以反铲挖土机作为前导,开挖沟槽;(2)沟槽暴露长度(称作坊段)约在10～30米之间,前挖后还,辗转前进;(3)坑段(一般深度在6米以内)以固定的或活动的板体支护,在其间作连续敷管;
I. Enlightenment from the construction of a new law In recent years, during the construction of foreign drainage pipeline projects, a new type of “scanning” construction method has emerged, such as the pit and trench method (French, Figure 1) and the sinking plate method (Simple Soil Application). 2) New construction method. Their common characteristics are summed up as follows: (1) Grooving construction with backhoe excavator as the lead and trench excavation; (2) The exposed length of the trench (called square segment) is about 10-30 meters. After the excavation, it shall be forwarded; (3) The pit section (generally within 6 meters in depth) shall be supported by a fixed or movable plate body and shall be continuously piped in between;