沈大高速公路改扩建工程新旧路基衔接技术

Linking-up technique for old and new roadbed in reconstruction and extension project of Shenyang-Dalian superhighway

针对高速公路改扩建工程的特点,着重对新旧路基间的衔接技术在理论上进行分析探讨,全面研究新旧路基衔接技术的施工工艺。清除原地表草皮及表土,挖除树根,原地面填前碾压使之达到要求;然后在原有路基结合处挖台阶,新旧路基结合处铺设土工格栅,使新旧路基衔接处不产生不均匀沉降;选出优质路基填料,新旧路基结合部进行强夯、凉晒、换填等技术处理。实践证明,路基衔接部分不开裂,提高路基平整度。通过以上方法对路面平整度的控制,经检测路面平整度符合规范要求。

In view of the characteristics of the superhighway changing and extending engineering, the article carries out theoretical analysis of linking up technique to the new and old roadbed, completely studies the construction craft of the new and old roadbed linking-up technique. The original turf and topsoil is cleared away on the land, tree roots are dug and the original road surface is crushed and pressed to make it reach requirement before it is filled; Then steps at the original place of roadbed combination are dug and the soil work space grid are built at the new and old roadbed combination place to, make the new and old roadbed link up the place not produce the asymmetry sinking; high-quality roadbed filling is selected, the new and old roadbed joining part should be treated with ramming and being exposed to the sun. Practice proves the roadbed linking-up part does not crack; the neat degree of the roadbed is increased. Though the above method, the neat degree of the road is controlled and the neat degree of the road can meet the norm request.