我公司在宁波常洪隧道工程施工中，因需要大土方深基坑作业，故需用多台挖掘机接力，最好是用超长臂挖掘机。由于我公司原有的2台超长臂挖掘机仍不够用，于是我们决定将已有的日立EX200－3型标准臂挖掘机自行改制成超长臂挖掘机。改制的方法是另制做一节长1．sin的接长斗杆，象 My company in Changhong tunnel construction in Ningbo, due to the need for large earthwork deep foundation pit operations, it is necessary to use multiple excavator relay, it is best to use long arm excavators. Since our original 2-arm super long arm excavator is still not enough, we decided to convert the existing Hitachi EX200-3 standard arm excavator into a super long arm excavator. The method of restructuring is to make a long section of another. Sin long rod, like