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采用暗沟排水已经有一百多年的历史,近来仍在不断发展。修筑暗沟的方法有敷设管道,鼠道和管道、鼠道相结合三种。国外排水管的敷设深度为1.2～3.5米、为敷设暗管的壕沟宽不超过0.5米,深度不超过4米。一般所用的机具见表1。这些机具在结构上差别不大,为适应不同用途有大、中、小之分。例如:为了提高工作效率,生产了一些大功率的挖掘机和高效率的联合作业机;为了适应小块地作业,发展了一些中小型机具,品种比较齐全。西德最近制造了一种新的排水沟挖掘机GFP3型,
The use of undercut drainage has been more than a hundred years of history, has continued to develop in recent years. The method of building undercut ditch laying pipe, rat and pipe, mouse and road combination of three. Foreign drains laying depth of 1.2 to 3.5 meters, for the laying of underground pipe trench width of not more than 0.5 meters, the depth of not more than 4 meters. The general use of machinery in Table 1. These machines are not very different in structure, in order to adapt to different uses of large, medium and small points. For example: In order to improve work efficiency, the production of some high-power excavators and high-efficiency joint operation of machines; in order to adapt to small jobs, the development of a number of small and medium-sized machines, more complete varieties. West Germany recently built a new gutter excavator GFP3 type,