Tutaj odpowiedź zawdzięczamy głównie znajomemu tłumaczowi, z którym temat jest konsultowany mailowo i w sumie zgadzałoby się z definicjami, które wygrzebałem w internecie.

"During excavation, shoring systems speed up excavation and provide safety for workers since trenches can be prone to collapse. In this case, shoring should not be confused with shielding. Shoring is designed to prevent collapse where shielding is only designed to protect workers when collapses occur. Concrete-structure and stone-building shoring, in these cases also referred to as falsework, provides temporary support until the concrete becomes hard and achieves the desired strength to support loads."

https://en.wikipedia.org/wiki/Shoring

"Trench shields (also sometimes called trench boxes) protect workers while they’re working inside a trench. They adjust to fit the size of the trench, and are typically constructed out of steel or aluminum. Unlike trench shoring materials, they are not designed to hold up the walls of a trench; they’re just there to shelter workers from a potentially dangerous collapse."

https://lubyshoring.com/whats-the-difference-between-trench-...

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"Za przyjęty system umocnienia wykopów odpowiedzialność ponosi Wykonawca."

http://bip.bogdaniec.pl/system/obj/1916_ST_01.02_ROBOTY_ZIEM...