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 V5083

Railway Bridge Re-levelled and Re-supported

Sub-industry
Rail
Problems
Subsidence
Location
NSW
Year
2005
Solutions
Re-levelling
Technology
Uretek®

The problem

All four piers supporting the rail bridge at Henty in Southern NSW had subsided so that for safety, train speed over the bridge had been limited to a maximum of 40kph. With Uretek structural resin injection to strengthen the foundation ground, the bridge piers were re-supported and raised back to their exact design levels.

The solution

The objective was to re-level the rail lines and resupport the bridge piers quickly and efficiently to enable both passenger trains and goods trains to use the rail line safely, without the need to reduce speed.

The Result

The greatest possible load applied to the foundation to be strengthened enables the greatest possible compaction of the subgrade. In this case a heavy locomotive was used to provide a superimposed load as overburden resistance.

The piers were shaped like an upside down T and were around 1200mm wide by the width of the bridge. The piers were founded at 1150mm deep. The National Rail Surveyor on site advised that the abutments at each end were unaffected, so they were used as the datum. Not only had all four piers subsided, but also this single track bridge was leaning to its western side.

Structural expanding resins were injected directly under the pier footings. At first the pressure of the resins expanding compacted the foundation ground beneath the bridge piers.

Then when maximum compaction had been achieved, the pressure was exerted upwards, lifting the piers, the bridge structure and rails.

In a single shift, the bridge was re-levelled, raising the four piers by as much as 40mm and correcting the differential settlement across the track by as much as 20mm. Rail traffic was able to resume safe use of the line at normal speeds, just 30 minutes later.

Resources

Project Resources & Downloads

Railway Bridge Re-levelled and Re-supported
Teretek®
Next Project

Airport Runway Rehabilitation

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