南水北调特大型PCCP安装的质量控制探讨

南水北调中线一期工程(北京段)惠南庄-大宁段工程采用特大型4 m直径双胶圈埋置式预应力钢筒混凝土管(PCCP)输水,目前尚无现成的安装技术经验和质量评定标准.作为工程的质量监督单位,首先,组织起草了针对本工程的PCCP安装质量评定验收标准,并经国调办正式发布实施.其次,在实践和研究的基础上,提出以下质量控制要点:首先要确保合格的PCCP安装在管道上;沟槽的开挖不应超挖,要做好地基变化处的基础处理工作,防止不均匀沉降;管道安装时,要做好承插口的清理,尤其是插口凹槽的清理;要注意检查橡胶圈的质量,使合格的胶圈准确、顺直、均匀、无扭曲的嵌在插口环凹槽内;对口就位时,要确保接头间隙符合要求;接口打压时,要确保施工可能影响到管口的压力试验符合要求;管道回填时,要做到两侧均匀下料,分层夯实,尤其是管道胸腔以下三角区部位的回填,必须两侧同步回填密实.

Quality Control of Super-Type PCCP Installation in the South-to-North Water Diversion

The super-type 4 meters of diameter PCCP, which has double cushion rubber and is embedded, is adopted in the first phase of the Middle Line Project in the South-to-North Water Diversion between Hui-Nan-Zhuang to Da-Ning. There is no criterion for construction quality evaluation on the super-type pipe installation, so Beijing Quality Supervision Center organizes people to make the criterion for this project. The Southto-North Water Diversion Committee of the State Council examines, approves and issues it.