Bairabi Sairang New Railway Line Project - Mizoram

Where Innovation Meets Infrastructure - Bearing Solutions for span 103.5m across bridge nos. 115 & 89 of Bairabi Sairang New Railway Line Project

Client

Northeast Frontier Railway (NFR)

Contractor

BBJ – ABCI JV

Location

Bairabi–Sairang, Mizoram

Project Type

Steel truss girders railway bridge

Project Overview and Technology

The 51.38 km Bairabi–Sairang railway line is a landmark infrastructure project in Mizoram, executed by Northeast Frontier Railway (NFR) under the Government of India’s Act East Policy. Traversing one of the most challenging terrains in the Northeast, the project features 55 major bridges, 87 minor bridges, and 48 tunnels, cutting through steep gorges, forested hills, and landslide-prone zones. This remarkable engineering feat required bearings capable of supporting extreme vertical loads while maintaining stability under dynamic conditions.

Bridges 115 & 89, with their 103.5m long spans, were executed across a challenging valley section, making it one of the most significant structures on this alignment. These bridges cross a deep valley while minimizing the number of intermediate piers.

The area experiences heavy rainfall, extreme humidity, and temperature variations. The materials and protective coatings used in our bearings were specifically selected for long-term durability in such extreme weather conditions.

We had meticulously planned the scope of this project to include a comprehensive analysis of existing structures, identifying key areas that require reinforcement. By collaborating with leading structural engineers, we developed tailored solutions that meet the specific needs of each site, prioritising both safety and functionality.

The outcomes of this initiative not only bolster the resilience of our built environment but also set new industry standards for safety and efficiency. We anticipate that the successful completion of this project will serve as a benchmark for future developments, showcasing the effectiveness of our products in real-world applications.

In addition, we are committed to utilising sustainable practices throughout the project lifecycle. Our approach includes sourcing eco-friendly materials and employing energy-efficient technologies, aligning with global efforts to reduce environmental impact.

Ultimately, this project represents a significant step forward in our mission to create safer, more durable infrastructures that can withstand the challenges posed by natural disasters, benefiting communities and enhancing public trust in engineering excellence.

Discover our Spherical Bearings in Action

We supplied highly specialized spherical bearings engineered to meet stringent performance requirements for this challenging project. Key supply highlights include the following.

Type of Bearings Supplied

Spherical Bearings

Special Features

Uplift arrangement with a maximum uplift capacity of 590 MT under Ultimate Limit State (ULS) conditions

Quantity

52 Nos.

Maximum Vertical load in ULS condition

1671 MT

Maximum Resultant Horizontal Load

1184 MT

Movement Capacities

Longitudinal movement capacity of ±165 mm under ULS

Rotational Capacities

Max rotational capacity in ULS condition of 0.015rad

Seismic Zone

Zone V (high seismic hazard zone)
Design and Manufacturing Highlights

Maximizing Safety in a Challenging Terrain

The Bairabi-Sairang New Railway Line Project in Mizoram posed unique technical challenges due to its geographical and environmental conditions, demanding tailor-made engineering solutions. Our successful involvement in the Bairabi–Sairang Railway Line stands as a testament to our commitment to engineering excellence, precision manufacturing, and the ability to deliver customized bearing solutions for critical infrastructure projects in India’s most demanding environments.

Custom Design

The Bairabi–Sairang region is categorized under Seismic Zone V and is prone to landslides. Our bearings were custom-designed to withstand such demanding conditions, ensuring durability and operational safety.

Material Grades Used

  • IS:2062, Gr. E350 Br Mild Steel for bearing components
  • HI3 orAISI316L stainless steel for sliding surfaces, ensuring corrosion resistance and smooth functionality

Applicable Standards

Designed and manufactured in compliance with IRC:83 – 2014 (Part-IV) standards for structural bearings with uplift arrangement