I do have same problem just next to my flat. Heavy noises during the entire night for the duration of minimum 8 months and I guess still will go on for another year. I called the police several time and they do always come to investigate but every time they come the Forman shows them an authorization issued from the municipality allowing them to work over night. Then I approached the municipality and their advice was to contact the central security department; than central security department advised me to contact the municipality and so on. SO I GIVE UP…..