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复杂情况下的若干检测问题

发布时间:2017-05-31 21:01:24 分类:新闻动态 来源: 点击:次

复杂情况下的若干检测问题 复杂情况下的若干检测问题   (1)大漏点包小漏点的问题:大漏点与小漏点相距很近,小漏点信号被大漏点信号覆盖,必须将大漏点挖出,挖至悬空,再次将小漏点探出来,将大、小漏点1并挖出,处理终了后再进行回填土方。  (2)多根平行且搭接的管网探测、检漏。首先,应将发射机的信号施加在阔别搭接点的某根管线上,这样突出目标管线的信号;其次,将检测到的漏点与探测管位结合起来,将漏点与目标管位1致点定为开挖点;再次,检漏方法采取纵向法,如果平行管道搭接且靠得很近,可将整体视为1根管道探测检漏。  (3)纵向检漏时有漏点,横向验证时却检测不到漏点,反之也有横向检测时有漏点,纵向检测时漏点却消失了。产生上述现象的缘由有3条:  ①漏点周围存在载流管线,两名检测人员位置变化时相对电位产生了变化。  ②漏点周围土壤的介电常数不1致或存在地磁场。  ③两名检测人

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复杂情况下的若干检测问题

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复杂情况下的若干检测问题