Building in needs of being secured after wall damages due to ground motion nearby. The yielding is caused by the collapse of a cave adjacent to the base of the building
During the initial site survey at 65/69 Via Borgo di Sotto – Cesare Romano (Roma), it was observed that the building was subjected to evident sagging floor; this caused extensive damage on the bearing structures of the building, to the point as making the structure close to collapse.
After a delicate and accurate analysis of the state of degradation of the building, it was decided to intervene in different work stages to make the building again practicable.
The bandage and circulation of the building with C-FRP was immediately carried out, anticipating this stage to the “filling” of the cave.
This inspection was carried out inside the buildings, particularly in the basement foundations, to evaluate the structural condition of the building itself. Adjacent the subsidence area there was a barrel vault pushing in the direction of failure. It became necessary to integrate the bandages provided for in the project so as to contain the angle and the horizontal thrust. In parallel, it was necessary to establish a provisional shoring of the vault to reduce the pressure on the corner that gave way.
The primary goal of this operation is to guarantee the security of the structure through urgent provisional or definite works. This was a first preparatory step before the subsequent stages of functional recovery and static building consolidation as: saturation of the cave at the bottom with self-levelling concrete or the execution of a micro-pile bulkhead downstream. However, filling the cave at the top was performed with polyurethane resin injections and the consolidation of the embankment was completed with nails through the use of “Minipali Geo-system®”, always injected with polyurethane resin.
Preparation of the support for the application of fibers with fiber-reinforced mortar
Bandage building with carbon fiber fabric in double layer anchored to the masonry by means of cfrp connectors.
Filling of the lower parts of the cave with self-leveling concrete.