吴建磊 黄海

摘要:预应力U形薄壁梁式渡槽在国内属较新型的结构形式,首次应用于东深供水改造工程。本文结合漆水河倒虹改建工程,在设计、方案及施工过程中对造槽机进行了优化改进,解决了翻浆、线形不顺直、端模脱模困难等施工难题。对采用造槽机法施工的24m、30m、40m等不同跨度的矩形、U型、梯形渡槽工程施工,具有一定的参考价值。
Abstract: The prestressed U-shaped thin-walled beam aqueduct is a relatively new structural form in China, which was first applied to the Dongshen water supply renovation project. In this paper, combined with the renovation of the Qishuihe inverted rainbow, the slot machine was optimized and improved in the design, plan and construction process to solve the construction problems such as grouting, uneven line shape, and difficulty in demolding the end mold. It has a certain reference value for the construction of rectangular, U-shaped and trapezoidal aqueducts with different spans, such as 24m, 30m, 40m, etc.
关键词:U型渡槽;造槽机;优化设计
Key words: U-shaped aqueduct;the aqueduct-making machine;optimal design
中图分类号:TV672+.2 文献标识码:A 文章编号:1006-4311(2020)21-0154-02
1 工程概况
漆水河倒虹改建工程全长723m,为Ⅲ等中型工程。漆水河渡槽跨越漆水河,全长420m,共14跨。梁式渡槽为单向预应力混凝土弧腳矩形槽简支结构,C50W6F150纤维混凝土,单跨长30m,渡槽净宽4.8m,净高2.8m,跨中断面净高3.2m,两侧直段高1.50m,槽壁厚0.30m,底板厚0.4m,渡槽顶部沿槽身轴线方向每隔2.5m方向设一根0.3×0.3m的拉杆,槽身底部布置9孔纵向有粘结预应力筋,单孔8根Фs15.2钢绞线。梁式渡槽下部支承结构边跨采用桩式槽台,中间跨采用重力墩,渡槽基础均采用灌注桩基础。预应力U形薄壁梁式渡槽采用一台DZ30/320型造槽机(移动模架)自出口向进口方向逐跨原位现浇施工。
2 造槽机的原理
造槽机是借鉴桥梁移动模架造桥机的经验,研制的一种自带模板,可自动前移的渡槽专用大型设备,主要由外梁、外模系统、外肋系统、内模系统、1号支腿、2号支腿、3号支腿、4号支腿、起升小车、附属结构、配重块、电气系统及液压系统等组成,其原理是利用槽墩上安装可能,支腿支撑外梁(主梁),在外梁系统上安装外模、外肋系统,与内模系统等组成一个可以自行纵向移动的渡槽施工平台。……