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1999年2月27日下午,随着3号排沙洞最后一块混凝土浇筑完毕,小浪底工程三条排沙洞衬砌全部结束,从而为工程安全度汛创造了有利条件。这三条排沙洞主要用于小浪底工程排沙和泄洪,洞身长度1105m,洞径6.5m,混凝土浇筑量7万多 m~3,由中德意联营体承建。在施工中,中外工程技术人员大胆采用无粘结预应力混凝土衬砌新技术并取得成功,这在国内尚属首次,不仅增加了洞身混凝土抗击高压水流的能力,而且使工期提前48天。
On the afternoon of February 27, 1999, with the completion of the last piece of concrete in No. 3 sediment discharge tunnel, the linings of the three sediment tunnels in Xiaolangdi Project were all completed, thus creating favorable conditions for the flood safety of the project. The three sediment discharge tunnels are mainly used for sediment discharge and flood discharge at the Xiaolangdi Project. The length of the tunnel body is 1105m, the diameter of the tunnel is 6.5m and the concrete pouring capacity is over 70,000m 3. During the construction, Chinese and foreign engineering and technical personnel boldly adopted the new technology of unbonded prestressed concrete lining and succeeded. This is the first time in China that it not only increases the capacity of concrete with holes to fight high pressure water flow, but also brings the construction period 48 days ahead of schedule.