The independent technical monitoring of the state of the ground and their possible subsidencies must be pursued after the works have been achieved, as a monitoring element of the property in its entirety, especially because of the effects due to the weight of the construction. Furthermore, the tri-dimensional monitoring models and structural analysis models of the Sagrada Familia and Casa Milà must be pursued.
The World Heritage Centre and ICOMOS recall that the inscribed property, concerning the Sagrada Familia only consists in the part of the Cathedral directly built by Gaudi. It is the crypt and the Nativity façade, which are not directly on the edge of the line of reinforced cement piles. However, it is obvious that a possible damage of some importance caused to the parts situated closely would alter the exceptional universal value of the property.
34 COM 7B.98
The World Heritage Committee,
Having examined the document WHC-10/34.COM/7B.Add,
Recalling the decision 33 COM 7B.121, adopted at its 33rd session (Seville, 2009),
Regrets that the suggestion of re-routing the fast train AVE‘s underground path, in the area of the Sagrada Familia and the Casa Milà, was not the subject of a real study concerning alternatives which would have a lower impact on the World Heritage Property;
Takes note of the technical documentation provided by the State Party, about the conditions to continue carrying out the tunnel boring works currently being undertaken;
Urges the State Party to take the following points into consideration, in order to improve the monitoring conditions of the tunnel boring works, in vicinity to the Sagrada Familia and the Casa Milà and their immediate halt at the slightest alert or slightest uncertainty of the grounds’ behavior, in order to ensure the Sagrada Familia’s and the Casa Milà’s structural integrity:
Put the Construction Monitoring Committee in place and extend its formation in order to guarantee that it includes independent experts and experts possibly critical regarding the project,
Clarify the technical programme related to the monitoring of the tunnel boring machine’s progression to the Sagrada Familia, in relation with the finest prevision possible concerning the static and dynamic consequences on the grounds and foundations of the Gaudi buildings,
Confirm the scientifical and administrative conditions by which the Committee can suspend, whith no delay and with full authority, the tunnel boring works,
Put in place a monitoring programme concerning the vibrations linked to underground rail usage at the level of the Sagrada Familia, for the two existing “metro” lines as well as for the future high-speed train (AVE) underground line, and consider a possible reinforcement of the vibration absorbing devices,
Perpetuate the Monitoring Committee after the works have been achieved, in order to ensure a monitoring programme, concerning the grounds and modelling of the structural outcomes of the Sagrada Familia and Casa Milà, taking into
State of conservation of World Heritage properties inscribed on the World Heritage List
WHC-10/34.COM/7B.Add, p. 179