意大利Micoperi公司生产的PTM450型海洋管沟挖掘机是一种用于海底管道铺设的特殊设备。在浅近海海域进行管道铺设时,由于在海床上直接下管,铺设后受过往船只推进器及作业渔船等影响,导致铺设管道受损或者移位,以至影响到管道的使用寿命。因此,与铺设陆地管道相似,在浅海进行管道铺设时同样要进行管沟的开挖与回填。在海底进行管沟开挖,相对较为困难,遇到的问题也较多,一般采用水力喷射和抓斗、轮斗等多种方式进行,管沟多数情况下依靠潮汐自然回填。框架和设备主体该机的框架由钢材焊接而成,主要功能是支撑安装在其上面 The PTM 450 offshore trench excavator from Micoperi, Italy, is a special equipment for submarine pipe laying. When laying pipelines in shallow offshore waters, the pipelines are directly under the sea bed. After laying, they are affected by past vessel thrusters and fishing vessels. As a result, pipe laying is damaged or displaced, affecting the service life of the pipelines. Therefore, similar to the laying of land pipelines, excavation and backfilling of pipe ditches are also to be carried out during the laying of pipelines in shallow sea. Trench excavation at the seabed is relatively difficult and more problems are encountered. Generally, hydraulic excavation, grapple grabbing and wheel bucket excavation are all conducted. Pipe ditches are often backfilled by means of tides. Frame and equipment main body The frame of the machine is made of steel, the main function is to support the installation on top