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日本手取川第2号水电站的差动式调压井,全高70.1米,衬砌内径19.0米,内设直径为5.45米的升管。在施工时先用BM100N型大口径岩石钻机钻进直径1.45米的导井,然后自上而下全断面扩大到直径23米。为了保持开挖井壁的稳定,与开挖作业平行,先进行厚1米的混凝土预衬砌,平均海米40～60平方米。调压井井体的混凝土衬砌采用滑升模板施工,衬砌厚度为1.0米,设双层钢筋,主筋直径为25～32毫
Japan’s Handan Chuan No. 2 hydropower station surge surge well, full-height 70.1 meters, lining diameter 19.0 meters, equipped with a diameter of 5.45 meters of the riser. In the construction of the first large-diameter rock drill BM100N drilling diameter 1.45 m guide wells, and then extended from top to bottom cross-sectional diameter of 23 meters. In order to maintain the stability of the excavation shaft wall and parallel with the excavation work, the concrete lining with a thickness of 1 meter is preliminarily lining, with an average of 40-60 square meters. Surging pressure of the well body of concrete lining with sliding template construction, the lining thickness of 1.0 meters, set double steel, the main reinforcement diameter of 25 to 32 milliliters