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新老路基的有效衔接是高速公路改扩建工程的关键技术问题。旧路扩宽主要的技术难题是如何减小新老路基之间的差异沉降,结合京石高速改扩建工程实例,着重对山前平原区新老高速公路路基拼接施工关键点进行了研究。主要施工措施包括边沟处理、开挖台阶、重型压路机强振补强、液压夯实机强夯、铺设高强土工格室及铺设钢塑格栅、堆载预压等,通车两年来未出现路面纵向开裂,证明了该路基拼宽设计及施工技术方案完全可以保证施工质量,可以保证新老路基的有效衔接,其技术措施可以为其他山前平原高速公路改扩建工程提供参考。
The effective connection of new and old embankment is the key technical issue of highway reconstruction and extension project. The main technical problem of the old road widening is how to reduce the difference between new and old subgrade settlement. Combined with the case of Beijing-Shijiazhuang Expressway Reconstruction and Extension Project, the key points of subgrade construction of the new-old expressway in the Piedmont Plain are emphatically studied. The main construction measures include the treatment of ditches, excavation steps, strong vibration reinforcement of heavy compactors, dynamic compaction of hydraulic compaction machines, laying of high-strength geocell and laying of steel grille, preloading and so on. Cracking. It proves that the project design and construction technology can fully guarantee the construction quality and ensure the effective connection of old and new roadbed. The technical measures can provide references for the reconstruction and extension of other mountain plain expressways.