The Church of San Andrés, which is located in the northern Spanish town of Calatayud, Province of Zaragoza, is an important example of Mudéjar Art. This architectural style dates back to the Muslims that lived in Spain during the Reconquista. Like many churches in Spain, the Church of San Andrés was originally built as a mosque and then remodelled into a Christian church between the 14th and the 16th Century.
Due to its age, as well as the poor ground on which the church was built, past problems of subsidence were detected that required restoration time and again – the last repair work was carried out between 1990 and 1992. At the end of 2012, the church had to be immediately closed because additional subsidence had caused movements of the building and new cracks in the masonry that put the stability of the entire church in question.
In early 2013, the special foundations specialist CIMSSA, who closely cooperates with DSC Spain, was commissioned to carry out the repair work. Since the work had to be executed as quickly as possible, CIMSSA and DSC decided to install the high quality DYWI® Drill Hollow Bar System for stabilizing the church foundation.
DYWI® Drill Micropiles, Ø R51-660, were installed, underpinning the entire church building. The micropiles with hardened arc-shaped Ø 115 mm button drill bits were installed selfdrilling to a depth of 12 m. In total, 3,600 m of DYWI® Drill Hollow Bars and 300 lost drill bits were installed.