The key to manually handling underground abandoned pipelines lies in how to ensure the discharge of toxic and harmful gases underground and the stability of surrounding rocks and pipelines during the disposal process of abandoned pipelines.Practice has shown that in the process of pipeline dredging,the principle of"ventilation first,detection second,and operation later"should be strictly followed.In the construction of clearing obstacles,attention should be paid to driving advance small conduits in advance,grouting should be strictly carried out according to the amount of grouting,and supporting structures should be erected.During the clearing process,the trend of surrounding rock changes should be grasped in timely manner to create conditions for safe construction.
关键词
隧道施工/地下障碍物/竖井人工作业/有毒有害气体/管道清淤
Key words
tunnel construction/underground obstacles/shaft manual operation/toxic and harmful gases/pipeline dredging
维普
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