a team of builders is engaged in the repair of a sewer well. reinforced concrete rings in the well. trenchless re-laying or

pipe repair drainage water hole sewer construction concrete sewage work underground sewerage plumbing well installation drain pipeline ground building system equipment metal tool tube street steel site job manhole installing maintenance worker trench engineering urban culvert pit waste grunge infrastructure replacement excavation reinforced man gutter dig ring brigade team group builders engaged rings trenchless relaying reconstruction systems