圆形隧洞全断面衬砌快速施工技术

Rapid Construction Technology of Full-section Lining of Circular Tunnel

工程导流(引水)隧洞布置在大坝右岸,隧洞全长549.3m(DK0+006.00~DK0+555.30),隧洞采用圆形断面,直径D=3.5m,衬砌采用C30钢筋混凝土衬砌,厚度h=40cm,因导流(引水)隧洞进口位于现有河道狭窄处,底板高程为224.5m,施工期正处于汛期期间,给施工带来极大的难度和挑战,该工程施工项目处于关键线路上,工期延期风险大。

The diversion tunnel of the project is arranged on the right bank of the dam with a total length of 549.3m(DK0+006.00~DK0+555.30).The tunnel adopts circular section with diameter D=3.5m and C30 reinforced concrete lining with thickness h=40cm.Because the diversion tunnel inlet is located in the narrow part of the existing river and the elevation of the base plate is 224.5m,the construction period is in flood season,which brings great difficulty and challenge to the construction.The project is on the key line and the risk of extension of the construction period is great.