大跨多连拱桥梁高支架设计与施工

High Support Design and Construction of Long-span and Multi Arch Bridge

临时支架结构对桥梁安全施工极为关键,结合大跨多连拱水利渡槽施工实践,研究山谷风区多连拱高支架设计与施工技术。拱圈支架采用钢管支架+贝雷梁结构,这样支架的迎风面积小,受风荷载影响相对小,节省材料。支架顺桥向一共6组,每组2排,横向1排设置5根钢管立柱,钢管立柱间距为3.8 m+5.0 m+5.0 m+3.8 m,中间3根立柱为主要受力立柱,两侧的立柱主要增加稳定效果。拱圈浇筑时的水平推力较大,为了确保支架的稳定性,采用钢管将其连接成一个整体。上部主梁采用贝雷梁形成的支撑架,在拱圈腹板位置进行加密,并且采用槽钢进行横向连接形成整体。按方案实施,支架稳定性得到充分保证,确保了拱圈施工安全。

The temporary support structure is the key to the safe construction of a bridge.Combined with the large span multi-arch construction practice of water conservancy aqueduct,study is conducted on multi-arch design and construction technology of high support in wind zone of valley.Arch bracket of steel pipe scaffold pluses Bailey beam structure is adopted to reduce the windward area of support;subsequently,less influence of wind load,thus save material.A total of 6 groups of brackets are arranged along the bridge,with a group of two rows.5 steel tube columns is arranged in a lateral row with a steel tube column spacing of 3.8 m＋5.0 m＋5.0 m＋3.8 m,the middle 3 columns as the main force bearing column,while the columns on both sides are meant to increase stabilization effect.Horizontal thrust during arch pouring is found larger,in order to ensure the stability of the steel tube scaffold,steel pipes are used connect it into a whole.The support frame beam made of Bailey beam is used for the upper part of main beam,and is encrypted in arch web position,and the channel are transversely connected to form a whole.Implemented according to the program,the stability of the support can be fully guaranteed,and the arch construction safety is ensured.