“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.

Produktbroschüre Kasten in KastenProduktbroschüre Kasten in Kasten

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