Valmiki Ramayana Sundara Kanda Sarga 42 Shloka 39

सुमहाबलः exceesively powerful one, सः he, Hanuman, शूरैः with heroes, तैः with those, सर्वतः all over, परिवृतः surrounded, तोरणाश्रितम् near the archway, भीमम् terrific, आयसम् a weapon made of iron, परिघम् iron beam, आससाद picked up.

Extremely powerful Hanuman surrounded by heroes all over, on his part went to the archway and picked up a terrific iron beam.