Operating for 35 Years I 150+ Years of Experience I 84,000+ Jobs Completed I Iso Accredited I In-house Engineering

Quick Enquiry Call Us

Search

If you cant find what you’re after please don’t hesitate to contact us.

Select Region

Please select the global region website you'd like to view.

Asia
Japan

Quick Enquiry

Submit your enquiry using our online form and include a brief message about the type of issues you are experiencing. One of the Mainmark experts will contact you as soon as possible.

Hidden
This field is for validation purposes and should be left unchanged.

Project Profile N6079

Sandstone Rail Tunnel Remediated

Sub-industry
Rail
Problems
Subsidence
Location
NSW
Year
1997
Solutions
Re-levelling
Technology
Uretek®

The problem

The original tunnel had been carved out of Sydney sandstone in the 1930’s, and sandstone shavings were laid as a base in the tunnel above which a concrete track slab was laid, to which the rails had been attached. The tunnel was sloping downhill and the base of the tunnel was eroded, forming a drainage route over the half-century of use. The water running down had dissolved and washed away the fine sandstone aggregate. This caused the tracks to spring up and down as the trains travelled over the tracks, causing both safety concerns and reduced operating speeds. The asset managers drilled 1 cm holes to investigate the problem, and observed that water gushed up as the trains approached and travelled over the tracks.

The solution

The objective was to raise, re-level and re-support the rail tracks so that the trains could pass safely and quickly. This was to be achieved with minimal interruption to the passenger train service on this principal city circuit.

The Result

Our Operations Crew and Rig were transported into the tunnel on a high rail truck, and supplied with 3-phase power, as our diesel generator could not be used in the confined space. The team injected engineered structural resin, working over 2 nights when it was convenient to shut down the train service during the work. The rail line was lifted up to +5mm of the original level and the sub-base was significantly strengthened. The State Rail Authority was very satisfied with the results of the work and contracted more work on other rail projects with sandstone tunnels.

Resources

Project Resources & Downloads

Sandstone Rail Tunnel Remediated
Next Project

Bespoke Teretek® Application Stabilises Heritage Church Foundations

Mainmark

© 2024 The Mainmark group of companies. ‘Mainmark®’, ‘Terefil®’, ‘Terefirm®’ and ‘Teretek®’ are trademarks of the Mainmark group of companies.

Mainmark Ground Engineering Pty Ltd
ABN: 51 606 182 503

ISO 9001
ISO 14001
ISO 45001

Residential

Commercial

Infrastructure

Mining

About Mainmark

Our team

Careers

Contact

Technologies

Media & Press

News

Awards

Privacy Policy

Terms and Conditions

Created by Codex

YouTube
Facebook
LinkedIn
Instagram