About Project

The Rishikesh-Karnaprayag Rail Link Project is a landmark railway infrastructure initiative in Uttarakhand, designed to enhance connectivity across the Himalayan region and provide seamless rail access toward the sacred Char Dham corridor. Package 6, located in the Srinagar Garhwal region, involves complex tunnel construction works under challenging mountainous terrain conditions. Scope: Construction of railway tunnels and associated RCC structures Milestone Achievement: Successful breakthrough of the escape tunnel in coordination with RVNL

Challenges

High Hydrostatic Pressure & Water Ingress: Tunnel walls and portals are continuously exposed to moisture, groundwater seepage, and hydrostatic pressure. Expansion joints require filler materials that do not absorb water or degrade over time. Seismic Activity & Ground Movement: Uttarakhand lies in a high seismic zone. Tunnel structures must accommodate minor shifts, vibrations, and expansion without cracking. Extreme Temperature Variations: Mountain environments experience substantial temperature fluctuations, causing expansion and contraction in concrete structures. Need for Long-Term Elasticity at Expansion Joints: Expansion joints in tunnels must retain compressibility and resilience for decades, without crumbling, hardening, or losing shape. Strict Safety and Durability Standards: Railway tunnel projects require materials that support long-term structural integrity and passenger safety under RVNL’s rigorous specifications.

Our Solutions

 Closed-Cell Moisture-Resistant Structure: The polyethylene filler board does not absorb water, making it ideal for tunnel environments with continuous exposure to moisture and seepage.  High Compressibility & Recovery: It allows for controlled expansion and contraction of tunnel concrete segments while returning to its original shape, ensuring long-term joint stability.  Lightweight, Durable & Chemically Inert: The filler board resists Chemicals, Rot and fungal growth, Thermal deformation, Ageing and cracking offering stable performance under challenging Himalayan conditions.  Excellent Thermal and Acoustic Insulation: The material helps dampen vibration and acoustics within the tunnel system, improving overall structural comfort and durability. Easy Installation in Confined Tunnel Spaces: The lightweight nature and flexible profile enabled efficient installation even in restricted tunnel zones and vertical construction spaces.

Impact & Results

The Expansion Joint Polyethylene Filler Board contributed to:
  • Reliable sealing and movement accommodation in tunnel expansion joints
  • Protection against water ingress, hydrostatic pressure, and climatic variations
  • Enhanced structural durability, supporting the long lifespan of tunnel linings
  • Efficient construction progress, facilitating accurate installation at portal areas and RCC structures
  • A successful milestone, supporting the progress leading up to the escape tunnel breakthrough
  • The product’s performance helped meet RVNL’s stringent quality and safety standards for mountain tunnel construction.
Download the Expansion Joint PE Filler Board Brochure