A new subway line is being built in Rio de Janeiro, Brasil. The use of Wassara´s Jet Grouting hammer made it possible to significantly increase the grout column production rate!
The new part, named Line 4, is under construction in the West Zone of the city of Rio de Janeiro and will open in 2016.
The formation presented a drilling challenge as it had layers of sand and stone combined with layers of large boulders and finally hard rock. That is why the contractor decided to test the Wassara Jet Grouting hammer.
The water-powered DTH hammer makes its way through any stone or boulder present in the formation and is a powerful tool for drilling a socket in solid rock. Since the drill string is complete with all necessary tools, no changing of equipment is required between the drilling sequence and the jet-grouting sequence or vice-versa.