English to Arabic Tech/Engineering Other slang expression

Hello. could anyone help me translate the word "monument" in the following context?

According to the case facts, employees were involved in
tack welding a 26-by-6-foot, vertically standing steel plate that weighed 3,500
pounds. They were welding the plate to another large horizontal plate resting on a
platform. The vertical plates were supported by two pairs of 80-pound braced
monuments bolted on each side of the plate.