Ramp steel box girder in-situ incremental launching construction method: Fid-Bau Portal

Ramp steel box girder in-situ incremental launching construction method

KE JINHUI / ZUO ZHIJING / LUO QIANG / LIU JINFANG

The invention discloses an in-situ incremental launching construction method for a ramp steel box girder. The in-situ incremental launching construction method comprises the following construction steps that S1, whether a main line bridge connecting ramp area has entering construction conditions or not is determined; s2, a temporary pier foundation for ramp steel box girder pushing is constructed; s3, distribution beams are arranged on the temporary pier foundations; s4, a pushing jack is arranged on the distribution beam; s5, enabling the pushing jack to synchronously perform pushing operation; s6, the ramp steel box girder sections are transported to a preset position to be assembled into a whole; s7, the formed whole ramp steel box girder is subjected to ground pushing operation through a pushing jack; s8, double cranes of the ramp steel box girder are lifted in place; s9, the ramp steel box girder pushed to the preset position is lifted to a supporting pier of the ramp steel box girder through double cranes; s10, the end, close to the reserved connector of the main bridge, of the ramp steel box girder is fixed to the reserved connector of the main bridge; and S11, the temporary pier foundation and the pushing jack are dismantled, an existing bridge can be protected, the steel ramp installation work can be completed quickly and well, and the construction efficiency is improved.

本发明公开了一种匝道钢箱梁原位顶推施工方法，包括以下施工步骤：S1.确认主线桥连接匝道区域是否具备进场施工条件；S2.匝道钢箱梁顶推用临时墩基础施工；S3.在临时墩基础上布置分配梁；S4.将顶推千斤顶在分配梁上设置；S5.使顶推千斤顶同步进行顶推作业；S6.将匝道钢箱梁节段运输至预设位置组装形成整体；S7.将形成整体的匝道钢箱梁通过顶推千斤顶进行地面顶推作业；S8.匝道钢箱梁双机抬吊就位；S9.将顶推到预设位置的匝道钢箱梁通过双机抬吊至匝道钢箱梁的支撑墩；S10.将匝道钢箱梁靠近主线桥预留接头的一端固定于主线桥预留的接头上；S11.拆除临时墩基础和顶推千斤顶，能够既保护现有桥梁又能既快又好地完成钢匝道安装工作，提升施工效率。

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