在回填土壤的应力作用下，管道在3∶00 ~ 9∶00时钟位置的石油沥青防腐层容易出现剥离并屏蔽阴极保护，导致管体腐蚀。
Due to the stress of backfilled soil, the asphalt coating at 3:00-9:00 (clock position) is easily disbonding and the CP is shielded, which results in the pipe body corrosion.
该装置包括有一个喷 管，喷管的后端通过软管与沥青泵连接，喷管的前端安装有喷头。
The hand-held asphalt-spraying device includes a nozzle, the rear end of which is connected with an asphalt pump via a hose and the front end of which is provided with a spray head.
该装置包括有一个喷 管，喷管的后端通过软管与沥青泵连接，喷管的前端安装有喷头。
The hand-held asphalt-spraying device includes a nozzle, the rear end of which is connected with an asphalt pump via a hose and the front end of which is provided with a spray head.
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