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  Construction of highway tunnel with the renovation of the railroad viaduct

  This paper reports the construction of an underground structure by underpinning where the Tokyo Gaikaku Expressway crosses under the railway viaduct of the JR-Sobu Line without affecting train operation. A large-scale box culvert was immersed on both sides of the existing railway viaduct by pneumatic caisson method. In addition, the box culverts were used as foundations for piers which supported the viaduct. Thereafter, we constructed a box culvert in the middle part by open cut method and completed the road tunnel by connecting three boxes. In order to confirm the safety of train operation, we investigated impact on nearby construction by FEM analysis. As a result of the FEM analysis, we confirmed displacement of the railroad satisfied the allowable displacement and measurements under construction also satisfied it.

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