A number of environmental activists from the camp locked themselves onto the gates of a warehouse near the airport which is owned by an Israeli firm.
A total of 40 arrests have been made since the camp was set up last weekend.
Protesters tonight threw a man off the site for aggressive and drunken behaviour.
He was escorted off the camp and handed to police officers who arrested him.
A spokeswoman for Heathrow said the airport is operating normally but traffic jams have formed on approach roads as police step up their activities.
