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1引言履带式工程机械在湿地条件下作业时，往往容易发生陷机事故，甚至对于一些湿地型机械也常常不可避免。除了履带式挖掘机可利用自身工作装置实现一定程度的自救外，绝大部分机械没有自救能力。由于履带式工程机械整机质量重，陷机救援工作困难较大。通常的做法有四种：一是
1 INTRODUCTION Tracked construction machinery is often subject to trapping accidents when operating in wet conditions, and is often unavoidable even for some wetland machinery. In addition to crawler excavators that can use their own work devices to achieve a certain degree of self-rescue, most machines do not have the ability to save themselves. Due to the heavy weight of the tracked construction machinery, it is difficult to trap the rescue work. There are four common practices: First,