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北赵灌区皇甫渡槽选型优化设计

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皇甫渡槽位于山西省北赵灌区黄土台塬上,地形切割强烈,且为强湿陷性黄土,边坡极易垮塌,常规渡槽设计极易因边坡垮塌造成主体结构损坏,因此需要对渡槽结构进行优化设计.通过静动力仿真分析多次调算,确定为下承式钢管混凝土拱式渡槽.主拱肋采用预制变截面矩形钢管,通过纵向连梁和风撑组成空间结构体系,主拱肋矩形钢管内灌注自密实微膨胀混凝土;主拱肋拱圈下部等截面钢箱连梁结构;钢箱连梁与拱圈之间采用预应力钢绞线联系;过水钢管桥面系采用工字钢+槽钢横联的连续组合结构;拱圈与纵向钢箱刚结,拱圈在拱座处刚结;两岸采用拱座基础+摩擦型灌注桩型式.该设计方法结合了常规渡槽和管桥方式,降低了结构自重,规避了滑坡损坏结构的风险.本设计成果为水利行业类似不良地质条件大跨径拱式渡槽的设计与施工提供参考,进一步推动大跨径拱槽(桥)的发展.
Optimized design of Huangfu Aqueduct in Beizhao Irrigation Area
The Huangfu aqueduct is located on the loess plateau in Beizhao Irrigation Area,Shanxi Province.The terrain is heavily dissected and the soil is highly collapsible loess,with slopes prone to collapse.Conventional aqueduct design is susceptible to structural damage due to slope collapse,so it is necessary to optimize the design of the aqueduct structure.Through static and dynamic simulation analysis and multiple adjustments,it is determined to be a through type steel-concrete arch aqueduct.The main arch rib adopts prefabricated variable cross-section rectangular steel pipes,forming a spatial structural system with longitudinal tie beams and wind braces.The rectangular steel pipes of the main arch rib is filled with self-compacting and slightly expansive concrete.The lower section of the main arch ring has a constant-section steel box tie beam structure.The steel box tie beam and arch ring are connected by prestressed steel strands.The steel pipe bridge deck adopts a continuous composite structure of I-beam and channel steels.The arch ring is rigidly connected to the longitudinal steel box,and the arch ring is rigidly supported at the abutments.On both banks,abutment foundation and friction type grouting pile are used.This design combines conventional aqueduct and pipe bridge methods,reducing the weight of the structure and avoiding the risk of structural damage due to landslide.This design achievement provides reference for the design and construction of large-span arch aqueducts under similar unfavorable geological conditions in the water conservancy industry,further promoting the development of large-span arch aqueducts(bridges).

high loess terrace of Yellow Rivercollapsible loessthrough typesteel-concrete arch bridgeself-compacting and slightly expansive concrete

张娜、王汉明

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中水北方勘测设计研究有限责任公司,天津 300222

黄河高阶地 湿陷性黄土 下承式 钢管混凝土拱桥 自密实微膨胀混凝土

2024

水利水电工程设计
中水北方勘测设计研究有限责任公司 天津市水力发电工程学会

水利水电工程设计

影响因子:0.209
ISSN:1007-6980
年,卷(期):2024.43(2)
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