From April 2019, the well-known company Costruttori Spa, specialized in the construction of tunnels, was awarded the contract for the execution of the construction works for the road S.S. 652 “Fondovalle Sangro” and again chose Promove hammers for this job.
The overall development of the work is 5739 meters, with 2465 meters of tunnels and viaducts for a total development of 1.2 kilometres.
In the construction of the tunnel, the Promove XP3100 breaker was used at the front, with an average progress of 1 meter every 4 hours for 16 hours a day on material consisting mainly of pelitic units (marl, clay, marly clays).
During the demolition phase in the shell, the most delicate phase, when the breaker works in an almost vertical position, the hammer is heavily stressed but thanks to the combined gas and oil technology, the XP3100 Promove significantly reduces the stresses transmitted to the excavator and the impact force of the piston is not affected by the “unnatural” position of use of the hammer.
The Promove breaker for these special applications is set up with a compressed air system and dust cover on the tool to prevent dust and debris from entering the hammer, which would reach the piston and damage it irreparably.
