艰险山区钢管拱高强微膨胀混凝土顶升施工技术

Jacking Construction Technology for Steel Arch High-strength Micro-expansion Concrete in Dangerous Mountain

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。

Steel arch high-strength micro-expansion concrete jacking construction in dangerous mountain is severely affected by the bridge site topography, natural climate and environment. Delivery concrete by feeding pump from both sides on ground position to the secondary pump on bottom level of the arch concrete, and then from two sides of the arch of the foot pump into the chord symmetrical lifting concrete, 1/4 arc chord position Relay manner in vitro expansion of HSLA steel arch concrete jacking technology in Longqiao Bridge for similar high-strength steel arch bridge in the micro-expansion concrete jacking construction has accumulated rich experience.