深水大跨度宽桥面斜拉桥施工方案

Construction Scheme for a Long Span and Wide Deck Cable-Stayed Bridge over Deep Water

鹿山大桥全长1 502 m,主桥为(118+256+118)m双塔单索面预应力混凝土斜拉桥,桥面宽33 m。结合该桥水深、跨度大、桥面宽的特点,通过方案比选,确定最终施工方案为:大直径钻孔桩基础采用栈桥和水上管桩及护筒组合平台施工;圆形大体积混凝土承台采用钢套箱围堰施工;双薄壁墩采用翻模法施工;独柱式塔采用爬模法施工;单箱五室倒梯形展翅主梁采用后锚固菱形挂篮悬浇施工。施工实践证明所采用的施工方法得当,满足质量、工期的要求。

The Lushan Bridge totals 1 502 m in length and its main bridge is a double-pylon and single-cable-plane prestressed concrete cable-stayed bridge with span arrangement （118＋256 ＋118） m and deck width 33 m. In the light of the characteristics that the water at the location of the Bridge is deep, the span of the Bridge is long and the deck is wide and on the basis of the com- parison of different constructions schemes, it is determined that the final construction scheme that should be adopted for the Bridge is as follows： the large diameter bored pile foundations are to be constructed on the trestle and on the platforms supported on the steel pipe piles and steel casings in water; the massive concrete circular pile caps are to be constructed by the steel boxed cofferdams, the twin-leg thin-walled piers are to be constructed by the turnover formwork, the single column pylons are to be constructed by the climbing formwork and the wide-flange and inversely trapezoid 5-cell single box main girder is to be cantileveredly cast in situ by the rear-anchored diamond-shape form travelers. Practice proves that the adopted construction scheme is appropriate and can meet the quality and construction time schedule requirements.