English to French Tech/Engineering Engineering (general) direct mounted

What is an independent scaffold in French
Below is a description and a picture can be found at www.darnallhire.com/putlogscaffolding/
Independent scaffolds follow the same principal as putlog scaffolds but are 'free standing', putlogs are replaced with 5ft tubes and a row of standards and ledgers are erected on the inside as well as the outside to provide support, in addition diagonal braces are fitted between standards to give stability.