南水北调渡槽墙身混凝土裂缝预防施工方法研究OA

Liaohe Culvert-type Aqueduct is one of the control engineering structures of the South-to-North Water Diversion Middle Route Phase I Project,undertaking important water conveyance tasks.To prevent concrete cracks of the aqueduct body and to ensure the safe operation of the aqueduct project,in the construction of the aqueduct,a new concrete pouring construction scheme for the aqueduct body was proposed.That is,when pouring the bottom plate,the 1.2-1.5m high part of the pier wall was poured simultaneously,the construction joints were properly treated and cured,and the remaining abutment pouring was completed within 15 days.Through finite element calculations of temperature field and stress field and analysis of monitoring data,the results show that this scheme can effectively reduce the scope of high tensile stress and high temperature areas inside the aqueduct body,and has a significant effect in preventing cracks in mass concrete.The new concrete pouring construction scheme has been successfully applied in many engineering works of the South-to-North Water Diversion Middle Route Trunk Canal,and no cracks were found in the concrete structures.