Multi-level Railway Over Bridge

Location: Surat, Gujarat Client: Surat Municipal Corporation

Casad Services: Bridge Engineering Design, Structural Analysis

---

Project Overview

The Karnimata Railway Over Bridge (ROB) stands as Gujarat’s first multi-level urban grade-separated crossing—an engineering landmark that connects the eastern and western regions of Surat across one of India’s busiest rail corridors.

CASAD Infra Solutions served as the structural engineering partner for this complex, high-volume transport intervention. Our team provided advanced design, detailing, and modeling services for all levels of the ROB and its intricate structural systems.

The Karnimata ROB eases congestion near Surat Railway Station, enables seamless multi-directional traffic movement, and stands as a benchmark in urban bridge infrastructure in India.

Casad's Scope of Work

• Bridge Configuration: A combination of 2-3 lane multi-level ROB/FOB structures

  • 25m PSC (pre-stressed concrete) girder spans

  • 40m long steel-composite spans

  • 12.5m RCC deck slabs

  • 20m voided slab segments

• Support System: Portal piers supported on single-pier pile foundationsTotal of 747 piles and 121 piers ensure robust substructure integrity

• Superstructure Detailing:

  • 232 PSC Girders

  • 30 Steel Plate Girders

  • 14,257 MT of concrete and 3860 MT of steel used

• Level-wise Connectivity:

  • Level 1: 5.2m wide, 410m long single-lane bridge (15m above ground)

  • Level 2: 563m long bridge for ring road to Sahara Darwaza traffic (8.75m elevation)

  • Level 3: 523m long return bridge (Sahara Darwaza to Ring Road)

  • Top Level: Two-lane, 540m long bridge from Sahara Darwaza to Kadodara

Capabilities in Action

• End-to-end structural analysis and detailing of complex bridge elements

• Integrated multi-level design for efficient traffic segregation and flow

• Expertise in hybrid superstructure systems and urban bridge engineering

• Collaborative workflows with architects, civic bodies, and contractors