Sava riverbed restoration at railroad bridge Slavonski Šamac

U radu je ponuđeno rješenje sanacije korita te održavanje i zaštita od degradacije na temelju utvrđenog postojećeg stanja korita rijeke Save kod profila željezničkog mosta Slavonski šamac. Cilj je zaštititi korito od erozivnog djelovanja uslijed suženja protočnog profila u profilu mosta te zaštititi stupove mosta od podlokavanja. Podloge korištene za izradu projektnog zadatka su: geodetske, hidrološke i geomehanike, na osnovu kojih su dobiveni ulazni podaci, vodostaji i protoci za karakteristične scenarije. U svrhu zaštite obala od erozije odabrane su obaloutvrde, pera te biološke vodogradnje (engl. live cribwall), a kao mjera zaštite stupova mosta od podlokavanja odabrana je zaštita kamenim nabačajem odnosno pripravom. Za odabrane regulacijske građevine provedeni su proračuni funkcionalnosti, stabilnosti i proračuni konstrukcije te troškovnik radova. Pri izradi rješenja projektnog zadatka korišteni su programski paketi HEC-RAS za hidraulički proračun teženja i podlokavanja, AutoCAD za izradu grafičkog duela projektnog zadatka te Microsoft Excel za proračune konstrukcija i stabilnosti.This work presents preliminary design of river restoration and scour countermeasures for Sava River reach at the railway bridge Slavnoski samac. Main goal of the design is to protect the river bed from erosion resulting from river flow profile constriction at the railway bridge and also to protect and preserve bridge piers from scour. Input data used for this project are: land surveying, hydrological and geotechnical surveys. For the purpose of conserving the riverbanksfrom erosion and undermining, bank revetment, groynes and live cribwall have been chosen as protection methods. Riprap protection was used for the protection of railway bridge piers against scour, as it is considered the most appropriate for similar purposes. Calculations for the functionality, stability and design were conducted for all river training structures, as well as cost estimate. Tools used in the process were HEC-RAS (computer software used in establishing hydraulic calculations of river flow and scour), Auto-CAD (graphical design) and also Microsoft Excel (calculations for construction and stability)