The incident took place when the victims were repairing a road damaged in the recent cloudburst on August 4, Uttarkashi District Magistrate R Rajesh Kumar sadi here.
The injured, including a Captain of BRO, identified as Rahul Ramesh, have been admitted to a hospital in Harsil area, he said.
Keeping in view the serious condition of the injured, a helicopter is being sent to Harsil to take them to the Government Doon Hospital for better treatment, BRO sources said.
Meanwhile, relief operation is continuing on war-footing in the natural disaster-hit Uttarkashi district where 28 people were killed and hundreds of others were rendered homeless.
The cloudburst and floods in Uttarkashi had caused wide-spread devastation damaging 113 houses completely and 158 houses partially, besides washing away nearly 38.54 hectares of agricultural land.
Relief material and food packets are being distributed among the affected people while medical teams have also been deployed in the floods-affected areas.
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Meanwhile, the rains continued to lash most parts of Uttarakhand causing fresh landslides and blocking roads.
Rishikesh-Yamunotri national highway is blocked at Ranachatti, Hanumanchatti and Badia area and efforts are being made to reopen it for traffic, said Disaster Management and Mitigation Centre (DMMC) sources.
A temporary bridge is being built by BRO in Gangori area on Rishikesh-Gangotri national highway in an effort to restore the road link which was snapped in the recent cloudburst, they said.
The scheduled visit of Uttarakhand Chief Minister Vijay Bahuguna to floods-affected Uttarkashi district was also cancelled due to inclement weather.
The Chief Minister was scheduled to visit to Uttarkashi along with state PCC president and state Disaster Management Minister Yashpal Arya, but his helicopter could not take off due to bad weather conditions, an official spokesman said.
He said that Bahuguna might now visit Uttarkashi on August 16.