一种斜拉桥混凝土梁组合式后支点挂篮塔梁同步施工的精细控制

Fine Control of Tower and Beam Synchronous Construction with Modular Rear Fulcrum Hanging Basket for a Kind of Concrete Beam of Cable-Stayed Bridge

从总体造价及后期管养费用角度考虑,矮塔斜拉桥宜采用混凝土梁设计和前支点式牵索挂篮悬臂浇筑施工。然而牵索挂篮自重大,拼装时需大型起重机械及临时支架配合,且现浇梁段施工时,需多次调整斜拉索索力,挂篮走行过程需较大吨位千斤顶配合,整体施工工期较长。在这种情况下,组合式后支点菱形式挂篮的改良应用可以使挂篮更加轻便,并缩短施工工期,带来经济效益。论文以某斜拉桥为例,详细介绍了组合式后支点菱形式挂篮的施工过程。

Considering the overall cost and the later management cost,the low tower cable-stayed bridge is suiltble for the design of concrete beam and cantilever pouring construction of front supporting point type pull rope hanging basket.However,since the hoisting basket is self-significant,large hoisting machinery and temporary support are required for assembly.In addition,during the construction of cast-in-situ beam section,the cable force shall be adjusted for many times.In the running process of the basket,the cooperation of large-tonnage jack is required,and the overall construction period is relatively long.In this case,the improved application of combined post-fulcrum form hanging basket can make hanging basket more portable,shorten the construction period and bring economic benefits.Taking a cable-stayed bridge as an example,this paper introduces in detail the construction process of modular rear fulcrum hanging basket.