Method for dismantling river-crossing concrete box girder old bridge: Fid-Bau Portal

Method for dismantling river-crossing concrete box girder old bridge

WEI CHENYANG / LI XUELAI / ZHANG SHILONG / LI BINGDE

The invention discloses a method for dismantling a river-crossing old concrete box girder bridge, relates to a bridge dismantling method, and aims to solve the problems that the existing old concrete box girder bridge adopts a mechanical crushing mode, so that the existing bridge floor cannot be recycled due to damage, and the dismantling time is relatively long. The method comprises the following steps that S1, auxiliary facilities on a bridge floor are dismantled; S2, a platform is erected on each pier column at the bridge head, the bridge tail and the lower portion of the bridge; S3, a bridge head and a bridge tail are cut, and a bridge deck and pier columns are separated; S4, a jack is installed and placed on each platform, the whole bridge floor is jacked up, a cushion block is placed on each pier column, and the bridge floor is heightened to be higher than the whole thickness of the bridge floor; and S5, a supporting frame is placed at the bottom of the bridge floor, a plurality of guide carrier rollers are installed on the top of the supporting frame, two inclined pulling beams fixedly connected with the supporting frame are arranged between every two adjacent pier columns, and the inclined pulling beams are arranged in a splayed shape. The material utilization rate is increased, the construction time is shortened, and the dismantling cost is reduced.

一种跨江混凝土箱梁旧桥的拆除方法，涉及一种桥梁拆除方法，以解决现有的混凝土箱梁旧桥采用机械破碎的方式，使现有的桥面破坏不能再利用，以及拆除时间较长的问题。本发明包括以下步骤：S1、拆除桥面上的辅助设施；S2、在桥头、桥尾及桥下的每个墩柱上搭设平台；S3、切割桥头和桥尾，并分离桥面和墩柱；S4、在每个平台上安装安放千斤顶，将桥面整体顶起，在每个墩柱上安放垫块，将桥面垫高到高于桥面整体的厚度；S5、在桥面底部安放支撑架，支撑架顶部安装有多个导向托辊，相邻两个墩柱之间设有两个与支撑架固定连接的斜拉梁，斜拉梁呈“八”字形设置。本发明提高了材料利用率，缩短施工时间，降低拆除成本。

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