Application of Jet Grouting technology for the renovation of historic buildings

Abstract

Renovation and restoration of historic buildings to appropriate functioning is a big challenge for the designer. In the case of this type of buildings, providing them with a new function usually requires the creation of new technical areas for installations and parking spaces. However, the change of function cannot be associated with a fundamental change in the image of the modernised building. In such case, additional areas are obtained by building in the underground spaces under courtyards, streets and often also under existing structures. In certain situations, the mere change in the function of existing underground levels forces an increase in their usable height by deepening of the foundation. Subsequent problem encountered during modernisation is the change in load of individual foundation elements, which is related to the rebuilt static system of the historic structure. In such case, the fragments of foundations require reinforcement that can be implemented by their deepening. One of the methods that enables improvement of the usable properties of basements by increasing their height, as well as reinforcement of the foundations of historic buildings, is jet grouting. This technology resolves many problems associated with limitations in the scope of size of used equipment and access to the place of formation of soil cement elements. Its application allows to significantly facilitate and accelerate the works at the construction site. This study presents the selected examples of the implementation of specialised geotechnical works in the scope of modernisation of historic buildings in Poland, as well as dependence of the strength of soil cement composite on the soil type.