Kasten-in-Kasten-mainimg

“Box-in-box” method for modular joint renewal

Principle

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.

Applications

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.

Kasten-in-Kasten-img1

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

Kasten-in-Kasten-img2

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

Kasten-in-Kasten-img3

Substructure after cleaning

Kasten-in-Kasten-img4

New expansion joint during installation, after connection to the structure

Kasten-in-Kasten-img5

Renewal of a 2-gap modular joint almost completed

Kasten-in-Kasten-img6

Traffic management during renewal of a joint in phases