峡口2号大桥中跨合拢方案

预应力箱形连续梁在完成各“T”构施工后，合拢段，特别是中跨合拢段的施工，关系到连续梁体的施工质量，如何在温度变化时，保证合拢段混凝土的质量，是合拢成功与否的关键，结合峡口2号大桥悬灌预应力箱形梁中跨合拢段施工的实践以及对合拢时各工况的分析，运用应力应变条件，推导了计算方法，确定了合拢技术参数。

The scheme of closure gap of the main spans of the second brigde in Xiakou

The closure construction of the main spans is relate to the construction quality of the continuous girders after the prestress box continuous girder finish its 'T' construction. The quality of the concrete in closure section under the condition of varied temperature is an important factor for the succession of the closure construction. Combined with the closure construction practice of the second bridge of Xiakou and the analysis of the work condition the paper introduce the method of derivation and the decision of the technological parameter to provide references for construction.