变截面连续箱梁施工技术探讨

Discussion on Construction Technology of Variable Cross-section Continuous Box Girder

目前关于变截面连续箱梁施工主要有两种方法,一种是悬臂浇筑法,即采用挂篮进行逐段浇筑、施加预应力;另一种是悬臂拼装法,即在预制场预制梁段,再在现场逐段拼装、施加预应力。两种施工方法各有优劣,前者占用场地较小,但施工质量和速度都较差,后者施工速度较快,质量也更容易得到保证,但需要在预制场集中预制,场地占用较大。具体采用何种方法,需要因地制宜,根据实际情况来进行选择。

Currently,there are two main methods for the construction of variable cross-section continuous box girders.One is the cantilever pouring method,which uses hanging baskets to pour sections and apply pre-stress;Another method is the cantilever assembly method,which involves prefabricating beam segments in the prefabrication yard and then assembling them one by one on site,applying prestress.The two construction methods have their own advantages and disadvantages.The former occupies a smaller site,but the construction quality and speed are poor.The latter has a faster construction speed and easier quality assurance,but requires centralized prefabrication in the prefabrication yard,which occupies a larger site.The specific method to be adopted needs to be tailored to local conditions and selected according to the actual situation.