Use of jet grouting technique to realize substructures of historic buildings: The example of an apartment building in Warsaw

摘要

The paper presents the application of jet grouting technology allowing to create a substructurernof existing buildings. Neighbouring historic apartment buildings situated in the centre ofrnWarsaw were used as an example. The ideas of the solution consisting in creation of basement wallsrntogether with new foundation, formed from cemented soil under existing continuous footings, were analysed.rnThe process of geotechnical engineering construction project implementation was surveyed in allrnstages of work, starting from preliminary concepts and the designing stage, through basic constructionrnand finishing works. Suggestions have been included regarding the tests and observations required duernto the exceptional characteristic of the facility and adopted solutions. Attention has been paid to thernnecessity of considering specific technological conditions. Additional difficulties related to the executionrnof works in the very centre of a large urban area and at substantially limited space of premises situatedrnbelow the ground level have been determined. The issue of specific requirements and limitations resultingrnfrom the need to interfere into the structure of a historic building has been raised. The role of executionrnmonitoring has been defined, suggesting the scope of required observations and measurements. Based onrnthe experience gathered during the construction, attention has been paid to especially important issues ofrngeotechnical engineering supervision.