介绍两种已获得国家专利救捞装置的工作部件的设计原理。该装置结构简单，功能可靠，节能环保。......

手掘式顶管(普通法顶管)遇特殊地质条件,如淤泥、流砂时,通常采用管前端加工具管方式施工,本文介绍了采用小口径深井降水结合顶管......

By introducing a small-caliber deep well rescue robot,a hold-hug pattern rescue mechanism was brought forward.In order t......