东明黄河公路大桥主梁加固关键施工技术

发布时间：2018-05-08 17:18

本文选题：组合梁桥 + 连续梁桥　；参考：《桥梁建设》2017年05期

【摘要】：东明黄河公路大桥主桥为(75+7×120+75)m的预应力混凝土刚构-连续组合体系梁式桥,该桥运营多年后出现了梁体开裂和跨中下挠病害。为解决桥梁抗剪承载力不足和跨中下挠问题,主梁采用斜拉体系加固方案,即在原桩基两侧增设桥塔,主梁下部横向增设托梁,托梁与主梁之间通过托架在箱梁底部连接,从桥塔至托梁锚固斜拉索。在主梁加固施工中,新增钻孔灌注桩基础采用回旋钻机钻孔,采用"U形管"法压浆;新增钢构件(托梁、托架和箱内钢支撑)施工主要包括吊装、钻孔、植筋及箱内钢支撑施工;斜拉索按照从中塔到边塔、从短索到长索的顺序分级对称张拉。加固后的荷载试验表明,斜拉体系加固施工改善了桥梁的受力,抬升了跨中截面高度,加固效果明显。
[Abstract]:The main bridge of Dongming Yellow River Highway Bridge is a prestressed concrete rigid-frame continuous composite beam bridge with 757 脳 12075m. After many years of operation, the bridge has been damaged by beam body cracking and mid-span deflection. In order to solve the problem of insufficient shear bearing capacity and mid-span deflection of the bridge, the main beam is strengthened by the cable-stayed system, that is, the bridge tower is added on both sides of the original pile foundation, the lower part of the main beam is transverse added with the bracket, and the support beam is connected to the bottom of the box girder through the bracket. Anchorage cable from bridge tower to bracket. In the reinforcement construction of the main beam, the new cast-in-place bored pile foundation is drilled by rotary drilling machine, and the "U-shaped pipe" grouting method is used, and the construction of the new steel members (bracket, bracket and steel support in the box) mainly includes hoisting and drilling, The construction of steel bracing in box is carried out, and the cable-stayed cables are graded symmetrical tension according to the order from the middle tower to the side tower, from the short cable to the long cable. The load test shows that the reinforcement of the cable-stayed system can improve the stress of the bridge, raise the height of the middle section of the span, and the reinforcement effect is obvious.
【作者单位】：山东大学土建与水利学院;交通运输部公路科学研究院;
【基金】：国家自然科学基金项目(11372165) 交通运输部西部交通建设科技项目(2011318223940)~~
【分类号】：U445.72

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