提出了一种新的在渐变段衬砌预留进人孔的混凝土施工技术方法。在渐变段衬砌前后两端已形成封闭状态,为保证混凝土施工质量,该方法在衬砌顶板利用免拆模板形成的进人通道进行施工作业,然后对进人通道进行一次性封堵,同原混凝土形成整体。其优点是保证了顶拱混凝土人工进行振捣,保证了混凝土浇筑密实和顶部脱空小,回填灌浆后砂浆干缩量小,不会产生顺流道渗漏。浇筑完成后经过物探检查证明,混凝土浇筑密实和顶部脱空小,渐变段衬砌预质量满足工程要求。 A new method of concrete construction reserved in manhole for lining in gradient section was proposed. In order to ensure the quality of concrete construction, this method uses the access road formed by dismantling the template to carry out the construction work, and then carries out a one-time plugging on the access passage, Form a whole. Its advantage is to ensure that the artificial vibration of the roof arch, to ensure that the concrete pouring dense and the top of the small empty, dry backfill mortar dry shrinkage is small, will not produce downstream leakage. Pouring completed after geophysical inspection proved that the concrete pouring dense and the top of the small gap, the gradient section of the pre-lining quality to meet project requirements.