“Box-in-box” method for renewal of modular joints


The mageba “box-in-box” method enables modular expansion joints to be replaced without any impact on the bridge’s structure. The substructure of the existing expansion joint is left in place, and a new joint is installed on top of it, with the support bar boxes of the new joint designed to fit into those of the existing one.


The “box-in-box” method is especially suitable when modular expansion joints are to be replaced with minimum impact on the bridge structure and in the quickest possible time.

      Image gallery

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        Old 3-gap expansion joint after removal of asphalt and waterproofing membrane at each side

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        Cutting to enable the support bars of the old joint to be lifted out

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        Substructure after cleaning

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        New expansion joint during installation, after connection to the structure

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        Renewal of a 2-gap modular joint almost completed

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        Traffic management during renewal of a joint in phases