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Soft corner rubber gaskets for segmental liners | Dr.-Ing. Werner Grabe, WGD, Germany

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Since the times of building the Channel Tunnel with its first regular use of EPDM rubber gaskets the development of profile geometry design and gasket corner design has been developed by design engineers of the rubber industry.  From some tunnel projects it has been reported, that concrete spalling happens mainly in the gasket corner area, in the situation of a T-joint between three segments. It was found, that the gasket corners were too massive, and some injected material flew into the hollow canals of profiles, by this reducing or even blocking their deformability.

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