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南水北调永定河倒虹吸穿五环路浅埋暗挖工程,西起永定河左堤堤脚,东至五环路匝道,全长76 m,五环主路路面至结构拱顶平均高度为11.9 m。本工程结构断面为4孔钢筋混凝土方涵。每孔开挖尺寸为5.6 m×5.6 m;结构成型后,每孔流水净空为3.8 m×3.8 m。工程采用锚杆、喷射混凝土作为初期支护,并进行二次全断面混凝土衬砌;采用超前小导管注改性水玻璃浆,并结合格栅钢架、锚杆、钢筋网、喷混凝土一起支护。该项目共需开挖土方9 533.44 m3,初期支护喷射C35混凝土1933.44 m3。工程总投资1400万元。
The South-to-North Water Diversion Project, inverted siphon through the Fifth Ring Road, is a shallow burying and shoveling project. From the left bank of the Yongding River to the foot of the embankment, the ramp to the Fifth Ring Road in the east reaches a total length of 76 m. The average height of the main road from the Fifth Ring Road to the structural vault is 11.9 m . The structural section of the project is 4-hole reinforced concrete square culvert. Each hole excavation size of 5.6 m × 5.6 m; structure forming, each hole flow clearance of 3.8 m × 3.8 m. The project uses the anchor bolt and shotcrete as the initial support, and carries on the second full-face concrete lining. Adopts the advanced small catheter to note the modified water glass paste, and combines the grille steel frame, the anchor rod, the steel mesh net and the shotcrete support together . The project needs to excavate a total of 9 533.44 m3 of earthwork and initial support injection of 1933.44 m3 of C35 concrete. The total investment of 14 million yuan.