引英入连扩建工程坝下大桥工程主拱无支架混凝土浇注施工工艺
인영입련확건공정패하대교공정주공무지가혼응토요주시공공예
The technology of casting concrete in main arch structure of the bridge without support in downstream of the dam of the project of transferring water from Ying river to Lian river