Year of inscription on the World Heritage List 1984
Year(s) of inscription on the List of World Heritage in Danger N/A
Previous Committee Decisions see page https://whc.unesco.org/en/list/320/documents/
Requests approved: 0
Total amount approved: USD 0
For details, see page https://whc.unesco.org/en/list/320/assistance/
UNESCO Extra-budgetary Funds
Previous monitoring missions
January 2010: Technical Reactive Monitoring Mission (ICOMOS)
Factors affecting the property identified in previous reports
Infrastructure project for a high-speed train tunnel
Illustrative material see page https://whc.unesco.org/en/list/320/
Conservation issues presented to the World Heritage Committee in 2011
On 31 January 2011, the State Party transmitted a report from the national company operating the Spanish railway system (ADIF) on progress made in implementing the recommendations, and also providing detailed technical documentation on the work conducted. This documentation is in addition to monthly technical information that the State Party submitted on the progress of work.
In its report, the State Party addresses the recommendations of the World Heritage Committee by providing the following information:
a) The Monitoring Committee was established with 19 international and independent experts from different disciplines. At the time of writing the report, the Committee met three times -- twice before the start of the work in front of the Sagrada Familia and once after the completion of the work. It is mentioned that the experts also carried out continuous monitoring during construction.
b) A detailed monitoring of progress of the tunnel boring machine (TBM) was implemented with technical vibration surveys before and after the passage of the TBM. Its passage at the level of the Sagrada Familia occured in early autumn 2010, without notable consequences in terms of soil compaction. Recordings of vibrations and soil compaction were made in the immediate proximity of the foundations and beyond the row of protection pillars. During the construction period, a vibration control device was introduced near the Casa Mila. The recordings have remained well within the safety standards in force.
c) The procedure for suspension of the work by the Committee is documented: it was implemented as from September 2010, based on 24/24h monitoring of the technical surveys of the work.
d) A vibration monitoring programme is planned for when the high speed trains will begin running in 2012, and will be submitted for evaluation before its implementation. For now, no additional reinforcement measures for the vibration absorber systems is considered necessary. There is no monitoring programme for the subway lines, and the ADIF directing the work of AVE (Alta Velocidad Española) is not responsible for subway lines.
e) It is envisaged that the Monitoring Committee shall continue its work until completion of the project in July 2011. The ADIF does not anticipate a longer-term monitoring programme.
f) The report nevertheless proposes to establish another monitoring committee following the construction phase in order to sustain a monitoring programme.
In its monthly reports of December 2010 and January 2011, the State Party provides the following additional information:
a) Cubic blocks of concrete will be employed to buttress the row of protection piles of the foundations and its bracing, at the level of the Sagrada Familia, below the surface of Mallorca street.
b) The Bureau of Experts met on 26 August 2010 and approved the project to build a row of concrete piles along the facade of the Casa Mila, based on a model similar to that already existing alongside the Sagrada Familia, to protect and isolate the foundations of this building. The 37 piles were placed in late January 2011.
The World Heritage Centre continues to receive complaints from local NGOs expressing their concern about the work of the tunnel. For example, the NGOs provided information that in January 2011 a stone had fallen from the heights of the Sagrada Familia, thereby suggesting possible ground vibrations.
Analysis and Conclusions of the World Heritage Centre, ICOMOS and ICCROM
The World Heritage Centre and the Advisory Bodies find that the work of isolating the foundations of the Sagrada Familia by rows of reinforced concrete piles appears so far to provide protection in conformity with the previsional studies already provided. The results, as reported by the State Party, during the passage of the TBM, and in the months following, seem satisfactory in terms of soil compaction and vibrations observed during construction. However, the World Heritage Centre and the Advisory Bodies note the following points:
It is recommended that an independent committee be set up permanently to ensure the monitoring programme and specifically the monitoring of soil compaction and vibration at the level of the structures of the two buildings concerned.
Decision Adopted: 35 COM 7B.109
The World Heritage Committee,
1. Having examined Document WHC-11/35.COM/7B,
2. Recalling Decision 34 COM 7B.98, adopted at its 34th session (Brasilia, 2010),
3. Takes note of the technical documentation provided by the State Party concerning the conditions for continuing the tunneling works in progress;
4. Notes the progress on the railway tunnel under Mallorca street, in conformity with the predictions of soil stability and structural vibration at the Sagrada Familia;
5. Also notes the placing of a row of concrete piles to protect the foundations of the Casa Milà, in conditions similar to those of the Sagrada Familia;
6. Urges the State Party to implement the following points in order to improve monitoring of the drilling near the Sagrada Familia and Casa Mila, and to facilitate their immediate halt at the slightest alert or the least uncertainty in the soil behaviour to ensure the structural integrity of the Sagrada Familia and Casa Milà:
a) Identify technical programmes underway or planned on the following:
i) the timetable for progress of the boring towards the Casa Milà,
ii) the status of the permanent monitoring programme for soil compaction and structural vibration effects related to rail traffic (subway and / or high-speed train AVE (Alta Velocidad Española)) at the Sagrada Familia and Casa Milà,
iii) a monitoring programme for structural vibration effects linked to the rail traffic of the Sagrada Familia and Casa Mila subway,
iv) the technical anti-vibration systems foreseen at the time of the installation of the underground railway,
v) regulations to limit the speed of high-speed trains in the tunnel, to make vibrational effects completely negligible in the long term,
b) Confirm that the Monitoring Committee will remain permanent in order to ensure ongoing monitoring of soils and structures at the Sagrada Familia and Casa Milà,
c) Provide the information requested above to the World Heritage Centre by 31 October 2011 at the latest;
7. Requests the State Party to continue to regularly inform the World Heritage Centre of the work in progress and conclusions of the meetings of the Monitoring Committee;
8. Also requests the State Party to immediately inform the World Heritage Centre in the event of soil compaction or other events that could have a negative impact on any of the components of the World Heritage property;
9. Further requests the State Party to submit to the World Heritage Centre, by 1 February 2013, a progress report on the implementation of the above recommendations, for examination by the World Heritage Committee at its 37th session in 2013.