This is the 12644th most frequent Portuguese word.
trancados
Locked or closed tightly.
The term 'trancados' here is used as a past participle adjective describing the state of the documents being secured within a locked safe.
Os documentos estão trancados no cofre.
The documents are locked in the safe.
In this sentence, 'trancados' is used as a past participle adjective indicating the state of being outside a location without access because it is locked.
Estamos trancados fora de casa.
We are locked out of the house.
'Trancados' in this instance functions as a descriptive adjective modifying the noun 'portões', showing that the gates were in a locked state throughout the night.