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艰险山区钢管拱高强微膨胀混凝土顶升施工,受到桥址地形地貌、自然气候环境的影响较大。通过两侧地面位置的一级输送泵向下方拱脚二级输送泵位置输送混凝土,再由两侧拱脚处二级输送泵向弦管内对称顶升混凝土,在1/4弦管弧长位置采用体外接力的方式完成高强微膨胀钢管拱混凝土顶升技术在龙桥特大桥中的应用,为同类桥梁的钢管拱高强微膨胀混凝土顶升施工积累了丰富经验。
The construction of jacking high-strength micro-expansive steel arch pipe in hard-dangerous mountainous area is greatly influenced by the topography of the bridge site and the natural climate and environment. Through the ground on both sides of the ground level of a pump to the lower arch pump two pump delivery location concrete, and then by the two sides of the arch pump at the pump to the string symmetrically rising concrete, The use of in vitro relay to complete the construction of high-strength micro-expansion steel tube arch concrete in Longqiao super-large bridge has accumulated rich experience in the construction of steel tube arch high-strength micro-expansive concrete for similar bridges.