stručni rad
Building of the sewerage system for City of Zagreb begun in 1892 and it run parallel with city development, but after WW II it stagnated and rapidly retarded compared to the city rapid development Nowadays the sewerage system is consisted of two separated subsystems, both connected to the Central water treatment plant for the City of Zagreb (CUPOVZ), which are city areas on the left bank of river Sava with north Zagreb and west Sesvete as one part and city areas on the right bank of river Sava with New Zagreb as the other part. In the documentation design process for reconstruction and development of the sewerage system investigation works and valuation of the existing structure for the sewerage pipe under the Heinzelova Street was carried out. The City of Zagreb plans to extend the tramway network through Heinzelova Street over the sewerage pipe and it is necessary to determine the conditions of the sewerage pipe and its resistant for additional load. Also, as the basic demand is continuity of operation for the pipe all works were carried out in extremely hard environment conditions, as to be shown. The results of both non-destructive and destructive “in situ” and laboratory testing will be presented as they represent good groundwork for the evaluation and selection of the proper retrofitting technology due to the importance and uniqueness of the existing structure.
sewerage pipe, “in situ” testing, NDT, deterioration process
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