管幕冻结法隧道补充定额研究与应用

Research and Application of Supplementary Quota of Tunnel Constructed with Freezing-sealing Pipe Roof Method

港珠澳大桥拱北隧道采用了世界首创的管幕冻结工法施工。由于缺少该工法的计价依据,按照补充定额编制要求和主要施工工序划分补充定额子目,在现场实测并提取定额原始数据的基础上编制管幕冻结工法的补充定额,并与类似工程的定额进行对比分析。结果表明补充定额的费用处于合理水平,可作为拱北隧道的计价依据。

The Gongbei tunnel of Hongkong-Zhuhai-Macao bridge constructs with the first freezing-sealing pipe roof method in the world.Due to the lack of its quota as the valuation criterion,this paper divides the supplementary quota sub-items according to the requirements of supplementary quota compilation and the main construction procedures,complies the supplementary quota of freezing-sealing pipe roof method on the basis of field measurement and extraction of the original data of the quota,and compares with the quota of similar projects.The results shows that the cost of supplementary quota is at a reasonable level,which can be used as the valuation criterion of Gongbei tunnel.