The mishap occurred last evening when the labourers, all from Bihar, were raising the tower by fixing its angles when it suddenly collapsed on them, they said.
The deceased were identified as Ravindra Kushwah (20), Ganesh (42), Niranjan (21), Rajesh (21), Ammo Muni (40), Rajesh (25), Avinash (21) and Praveen Singh (40), police said.