大跨度渡槽拱肋浇筑技术在工程中的应用

Application of arch rib pouring technology for large span aqueduct in the engineering

廖坊水利枢纽灌区二期工程工期紧,大跨度拱式渡槽拱肋混凝土浇筑作为制约工期的关键工序施工难度大.通过施工方案比较,拱肋混凝土采用分3次7块、纵横对称的浇筑技术,创新了大跨度拱式渡槽拱肋建造方式.此技术减少了拱肋混凝土浇筑过程中的混凝土温度应力和入仓混凝土荷载引起的模板支架变形,保证了拱肋同心圆度满足设计要求,确保了拱式渡槽的施工质量,具有较好的推广应用前景.

As the key process of restricting time limit for Liaofang irrigation area phase Ⅱ project,arch rib concrete pouring construction of large span aqueduct is of great difficulty. Through comparing construction schemes, arch rib concrete adopts 3 times 7 blocks and crossbar symmetric pouring technology, which is to innovate the construction ways of arch rib in large span aqueduct. This technology can reduce the concrete temperature stress in the arch rib concrete pouring process and the template deformation which caused by concrete load,ensure the concentric roundness of arch rib meeting the design requirements and construction quality of arch aqueduct. It has wide application prospects.