TREATMENT TECHNOLOGY OF UNDERGROUND OBSTACLES IN SHIELD TUNNELING OF METRO
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.
tunnel constructionunderground obstaclesshaft manual operationtoxic and harmful gasespipeline dredging
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维普
