合龙段是整个连续梁施工的重点部位,合龙口两端悬臂梁随着温度变化伸长或缩短,导致合龙段参与体系承受拉、压作用,新浇筑的合龙段混凝土在短时间内未具备足够强度,过早受力则破坏混凝土内部胶结构造,使其强度受到影响。结合哈齐客运专线松花江特大桥工程连续梁合龙段施工,对连续梁温度应力及外部约束力进行计算,设计出合龙段劲性钢骨架体系,以保证合龙段施工质量。 Closure section is the key part of the continuous construction of the continuous beam, both ends of the cantilever cross-linked with the temperature changes in the elongation or shortening, resulting in drag parachute system to withstand tension and pressure effects, the new cast-in section of concrete in a short time did not have enough Strength, premature force will destroy the internal cement structure, so that its strength is affected. Combined with the construction of the continuous girder of Songhuajiang Super Large Bridge in Harbin-Qiqihar Passenger Dedicated Line, the temperature stress and external restraining force of the continuous girder are calculated, and the cohesive section steel frame system is designed to ensure the construction quality of the closing section.