contact us

Steel Supports


Steel supports are the main components of runway tracks and come in various types and shapes dependent on the rail-mounted equipment such as soleplates and chairplates (baseplates/support plates), steel sleepers and steel columns. The primary function of a steel support is to provide rails with a flat, smooth resting surface which allows for the vertical alignment of a rail system.

Whilst anchor bolts secure the steel supports, specific levelling devices adjust the vertical level.  Depending on the specific industry application and moving equipment (cranes or rolling stock), steel supports are installed on top of a layer of grout or concrete that fills the void between the steel support and the concrete foundation.

contact us


Gantrex has pioneered the development of the Adjustable Chair for situations where post-installation vertical and horizontal settlements/movements of the foundation are anticipated (as with container stacking yards).

What are the Adjustable Chairs?

A type of discontinuous rail support that allows for horizontal and vertical adjustment of the rail. Adjustable chairs are typically made of metallic components, including a fixed base plate; on top of which come shims, whose number and/or thickness can be changed to achieve the desired height. On top of the shims comes an upper plate, which lateral position can sometimes be adjusted as well, for example, by means of slotted holes. Adjustable chairs are generally used when the supporting structure is expected to move, due, for example, to land settlement or sleeper movement in their ballast bed.

This genuine, patented Gantrex® system is equipped with the latest RailLok™ technology and allows for simple and rapid initial installation in compliance with the strictest rail tolerances including ISO 12488-1, AIST Technical Report 13, and CMAA, as well as for post-installation vertical and horizontal adjustments to restore rail elevation and horizontal positioning to these same tolerances in the event of foundation settlement or movements.

This patented system is particularly suitable for stacker-reclaimer cranes and cranes with automated positioning or operating systems, such as Automated Stacking Cranes.

Steel Plates

Steel Plates

The rails are supported by a steel structure, either continuously or intermittently.

Continuous support generally consists of weldable structural steel soleplates to which the fastening systems of the rail are fixed. The design of the soleplates will take into account the civil layout, handling issues on site, calculated clip spacing and crane loads distribution.

In the case of intermittent structures, the discontinuous support generally consists of structural steel chairs to which the fastening systems of the rail are fixed. The design of the chairs will consider civil layout, handling issues on site, calculated support spacing and crane loads distribution.


This patented  fastening system is a fast and easy track re-alignment solution to overcome shifting rail foundations without rail removal

– Vertical and lateral realignment

– Anchoring system fully independent from stresses generated by the crane

– Precise and stable rail adjustment

– Easy soleplate assembly, stable and accessible

– Incorporating the RailLok™ clips technology

GANTREX® RailLok Adjustable Chairs are available in different sizes and capacities to suit different rail profiles and wheel loads. The correct design not only depends on those mechanical and dimensional considerations but also on installation contingencies.

The Gantrex RailLok Adjustable Chair patent is filed under the following numbers across the world: US9657445B2, EP2893082B1,  CN105143554B


A quick and flexible railway track lay solution allowing reduced concrete thickness under the foot: the economical solution for embedded tracks.


The GANTREX® Pit Track GPT multi-component system includes clips, pad, electrical insulator, steel column and grouting material.

Designed with FEA calculations, the GPT system is customized to the rolling stock characteristics.  Get in touch with our technical teams to find out more.


Related videos

Gantrex RailLok™ Adjustable Chair

Driving excellence & innovation through collaborative partnerships

View All References

Related Projects

Yangshan Port Shanghai, China

  • Project name: Yangshan Deep Water Container Terminal Phase IV ASC Stack Yard (Year 2015)
  • Application: Port-ASC
  • Description: Supply of MRS 87A rail (45,170 m) together with Gantrex Releveling chair system.

read more

Port of Long Beach, CA, USA

Pier E Terminal/Container Yard-Phase 1.
Gantrex supplied rails, relevelling chairs and grout.

read more


Gantrex delivered sleepers (for trains) and continuous sole plates (for gantry cranes) for the ADIF multimodal terminal.

read more

Vedanta’s Vizag General Cargo Berth, India

Project Name: Vedanta’s Vizag General Cargo Berth
Industry: Port
Location: Vizag Port
Description: STS Cranes for Coal Handling and Stacker Reclaimer on Sleepers

read more

Metro of Santiago, Chile

Application: Pit Track
Material: 2200 GPT Systems

read more
View All References

Why go with gantrex?

Global coverage, local presence

Your partner throughout your project

Over 50 years of experience

Always innovating our products and services