Why didnt they barricade the car lane off and use that to install the bike barrier lane protectors from ? Use stop / go personell so cars can use the other lane.
They've blocked the entire cycle lane with what looks like a compressor up ahead as well (presumably to supply a pneumatic drill for the bolts)
Or here's an idea, install concrete barricades from the back of a truck with a crane that actually project cyclists from being murdered.