SAN MIGUEL TOWER
19 February, 2018
ALHARILLA MONUMENT
4 March, 2017
Imagen-cabecera-CISTERNA

ROMAN CISTERN RESTORATION

Starter date

Developing

Location

Camino de San Marcos Street.

Architect

Pablo M. Millán Millán

Construcción

Developing

Pathology study

Geocisa

Contributors

Javier Serrano Terrones (Technical architecture)
Javier Bengoa Díaz (Engineering)
Julio Herrera del Pino
Inmaculada Cervera Montilla

PROJECT OF RESTORATION AND SETTING IN VALUE OF THE ROMAN CISTERNAS OF “LA CALDERONA”

After an exhaustive analysis of the structure object of the project, the following pathologies have been detected:

– Collapse in the northeast area: one of the main destabilizing problems of the whole.

– Clogging of fillings in lower levels: the entire bottom of the cistern is clogged with period fillings that prevent water circulation.

– Surface loss of Opus Signinum: The entire cistern was lined with opus signinum, a paste made of lime and crushed pottery that served as a waterproofing barrier. At the present time several fragments of this mortar are conserved that begins to crackle and to fracture, having already important losses.

– Fissures in structural lintels: The load of the buildings located in the upper part of the tanks has come to fracture some structural elements, that although there is no risk of subsidence, They need to be restored urgently to avoid possible further deterioration.

– Sandstone sandstone making: the stone from which the entire cistern is built is made of stone from local historical quarries. This stone is characterized by alternating hard and soft layers (approximately 20 cm each) that prevents to get a vertical cut of large dimensions in a hard layer. This feature of the stone means that, in contrast to humidity, the soft layer is soaked by humidity and loses a lot of resistance, becoming sand and losing volume. In the cistern are many blocks that need to stabilize their sandblasting by this pathology.

– Appearance of efflorescence: As described above, with the blindness of the ventilation points, a process of chemical deterioration has taken place due to the appearance of efflorescence.

– Alveolization of ashlars: The different hardness of the ashlars, together with the high degree of humidity has triggered a dangerous effect of alveolization of ashlars, which will be necessary to brake in order to achieve the structural stabilization of the property.

– Appearance of oxides by filtration of substrate: The filtration of water and the lack of cleanliness has brought with it the appearance of numerous salts, sulfates and oxides, dyeing all the structures. Also the oxides of some objects dropped by the wells when they were open, have increased the appearance of fungi that have adhered to the opus signinum.

– Closed wells: As described above, the well sealing process has triggered an exponential increase in the humidity of the space, opening is necessary immediately to avoid the appearance of greater processes of chemical deterioration.

– Overload of load-bearing structure: The constructions located on the tank have generated an important compression effort, even breaking some of the large boards that cover the tanks. The project foresees its documentation and sensorization to study its evolution.

– General cleaning: The important state of abandonment of space requires a cleaning intervention of some urgency. Since its opening by the archaeologists of the Porcuna Project in 1979, only conservation and restoration work has been carried out for research, without being taken at any time.

Blueprints

Pictures