Three construction workers at a new Holiday Inn motel under construction at 2101 Wisconsin Ave. NW were injured yesterday when the roof of the building's elevator shaft collapsed under weight of 32 tons of freshly poured concrete, a construction official said.

A. D. C. Fire Department ambulance took the three men to Georgetown University Hospital. They were identified as Nemiah R. Green, 38, of 3501 22nd St. SE, who was admitted for observation in good condition; Calvin B. Cutchin, 19, of 1303 Irving St. NW, who was treated for a minor foot injury and released, and Rudolph Wilson 22, of 649 Irving St. NW, who was admitte for observation in fair condition.

According to Frank Donahoe, an owner of Donahoe Builders, which is constructing the motel, the collapse occurred about 12:30 p.m. yesterday as construction crews were pouring the roof of the motel's elevator pent-house.

Donahoe said the men had poured about 90 per cent of the roof when it collapsed.

Capt. Lawrenhe Beardmore, of Engine Company No. 5, said firemen had to wade into a pool of fresh concrete to rescue one of the men.

D. C. building inspectors and inspectors from the Occupational Health and Safety Administration inspected the project, but had not determined the cause of the incident by last night.

The collapse yesterday will not delay the scheduled opening of the seven-story motel next February, according to Frank Perper, president of Motel Management, Inc., holder of the franchise.