在内外水位差超过27m的取水塔内开挖较小直径的竖井,国内外均较少见,其难点在于既不能扰动塔身,又必须保证竖井内不漏水。铁道建筑研究设计院和铁道部第十三工程局在铁岭电厂取水头部工程施工中,成功地解决了上述问题。本文系统地介绍了该工程采用注浆、钻爆法开挖水下竖井的施工工艺及其关键技术。 Excavation of smaller diameter shafts in the intake towers where the water level difference between the inside and outside exceeds 27 m is rare at home and abroad. The difficulty is that it can neither disturb the tower, but also ensure that there is no water leakage in the shaft. Railway Construction Research and Design Institute and the Thirteenth Engineering Bureau of the Ministry of Railways in Tieling power plant head construction, the successful solution to these problems. This paper systematically introduces the construction technology and key technologies of this project by grouting, drilling and blasting underwater shaft.