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上海世博北京西路～华夏西路电力电缆隧道工程中,隧道内部现浇混凝土的最大水平输送距离达800m,已超出一般混凝土泵的理论输送极限。因此施工中,对输送泵的选型、混凝土配比,以及现场泵送管路布置等方面都进行了优化,顺利实现了804m最长水平输送距离的混凝土结构浇筑任务。本文结合工程实例,阐述了中等直径盾构法隧道施工中,长距离泵送混凝土容易出现的一些问题和宜采取的对策,可为今后类似工程提供借鉴。
In the project of Beijing West Road to Huaxia West Road in Shanghai World Expo, the maximum horizontal conveying distance of cast-in-place concrete in tunnel is 800m, which is beyond the theoretical transmission limit of common concrete pump. Therefore, the construction of the selection of the pump, the ratio of concrete, as well as on-site pumping piping layout and other aspects have been optimized, the smooth realization of the 804m maximum horizontal conveying distance of the concrete structure pouring task. In this paper, the engineering examples are given to illustrate some problems that are prone to occur in long-distance concrete pumping and the countermeasures to be taken in the construction of medium-diameter shield tunneling, which can provide reference for similar projects in the future.