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论述了预应力混凝土连续梁跨线天桥由于病害严重而拆除采取的方法,结合安全、成本、进度、环保以及对既有高速公路通行的影响等因素进行方案比选,提出机械破碎法施工方案。文章针对施工机械以及施工步骤进行优化,较国内一般的施工方法有一定优势,以北山头村3号天桥拆除工程为例,验证了方案的可行性,为我国预应力混凝土连续箱梁跨线天桥拆除施工提供了一定的借鉴。
The method of disassembling the overpass of prestressed concrete continuous girder bridge due to serious disease is discussed. The construction scheme of mechanical crushing method is put forward based on the comparison of safety, cost, schedule, environmental protection and influence on the existing expressway. The article optimizes the construction machinery and construction steps, which has some advantages over the general domestic construction methods. Taking the demolition project of Beishantou No. 3 flyover as an example, the feasibility of the scheme is verified. It is the first choice for the overpass flyover of prestressed concrete continuous box girder Demolition of the construction provides a certain reference.