Recent principles of foundations design and construction are described and innovation solutions are given: steel pipe sheet pile foundations, driven large diameter steel pipe piles, jacked foundation piles, Hyper-Mega piles, improved technology of caisson and well foundations, slurry-wall and deep water foundations, and also influence of off shore platform engineering on development of bridge foundations. Conception of hybrid piled raft foundation and test technology of very large capacity foundation was given. Examples of innovation solutions applied in large bridge constructions are provided.
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W artykule przedstawiono analizę zmian kształtu powłok, wykonanych ze stalowej blachy falistej w mostowych obiektach gruntowo-powłokowych o parabolicznej i zamkniętej geometrii pasma obwodowego konstrukcji.
EN
The paper concerns flexible, corrugated soil-steel bridge structures, with a parabolic cross-section. Deformation of the structure is thereby estimated by measuring those two displacements. Because of significant changes during backfilling, displacements can be measured using surveying techniques. This allows for observing in-situ structure deformation changes in construction stages. In the paper an algorithm, designed to estimate bending moments, which are the main determinant of stresses in the steel shell is proposed. The algorithm results were confronted with results obtained in-situ. This testing included measurement of unit strains, that enabled determination of bending moments, which allowed an independent verification of the results of calculations. In the proposed method internal forces are determined on the basis of steel shell displacements, therefore the backfilling method is also taken into account.
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