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The railroad built on the old Tehran-Qom path, between Eslamshahr and Prandak, which has been around for 70 years, is consisted of about 200 railroad bridges designed for a 20-ton load. With over 70 years of age, the bridges have suffered Structural damages that had to be repaired and reconstructed. In addition, due to the new standard of Iranian Railways for axial loads of 25 tons, it was necessary to increase the resistance of the bridges trough increasing the axial loads of the passing trains in order to improve the alignment with other railroads.
Overal View of a Viaduct bridge before repairs
Steel reinforcement belts have been used to reinforce the axial load of the Viaduct bridges by reinforcing the arches and bridge supports.
View of the Viaduct bridge after the completion of rehabilitation process.
View of a Battle Bridge Before repair, these bridges had a metal deck without ballast, which had to be converted into a ballasted bridge. Meanwhile, the bridges did not meet the axial load of 25 tons.
The method of converting the Bridge into a two-way pipe, made of reinforced concrete. Concreting the space between the deck and the pipes.
View of the bridge after the completion of rehabilitation process.
View of a bridge before repair. The bridges had a ballast-free metal deck that did not meet the 25 ton axial load. The bridges are reinforced by reinforcing metal slabs and slab-track concrete deck installation.
Reinforcing deck beams by adding reinforcing sheets to increase the the strength of sheets
View Slab-track deck implementation
Load test with heavy locomotive and stress and strain monitoring using strain gauge.
The bridge is a large bridge with four openings on the Taharen-Saveh freeway. The structural system of this bridge was concrete box shafts.
Geotechnical experiments to evaluate structural adequacy of bridge. Determination of the mechanical properties of the supports infrastructure was done by coring of the bridge supports.
Ultrasound experiments have been used to confirm the rebar implemented with bridge executable maps.
The strength of bridge concrete was measured by core sampling and laboratory loading test.
The structural strength of the bridge for passing the load of 25 tons was only defective in the foundations of the supports. Therefore, by reinforcing cement slurry and using micropiles, the mechanical properties of the supports were strengthened.
Bose bridges were tubular canal bridges that, after analysis, lacked the necessary resistance for crossing of 25 tons.
These bridges have been reinforced by the addition of reinforced concrete pipes into existing pipes and concrete the spacing between them.
Filling the space between the new and the old pipe with Concrete
Final View of the Canal after repair and rehabilitation.
The arch bridges consisted of an unarmed concrete slab, which, according to calculations and analysis, lacked the necessary resistance for the trains with 25 tons axial load to cross.
In order to perform the repair and reinforcement operation, first the dredging and cleaning of the bridge was performed with waterjet.
Repair of structural concrete defects using special restorative mortars.
Reinforcing bridges using steel straps.
Bridge after repair, reinforcement and waterproofing of concrete.
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