May one support a broken beam with the side-rails of a bed on Shabbat?

ShabbatBuilding (Boneh)

Synopsis

The Mechaber permits supporting a broken beam with bed rails (arukhot ha-mita) to prevent further sinking, provided they are placed loosely. The purpose must be preventive, not to elevate the beam. Wedging the support in place is forbidden.

Early Acharonim
Lenient
Strict
Lesser cited
Major authority

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