Carlton Station, Nottingham, UK

Carlton Station Platform 20mm step to coping

Carlton Station Platform 20mm step to coping

Carlton Station Platform OB Applied using Draw Box

Carlton Station Platform OB Applied using Draw Box

Carlton Station Platform Tecroc not Cured 1 hour

Carlton Station Platform Tecroc not Cured 1 hour

Carlton Station Platform OB Trip Removal Misc

Carlton Station Platform OB Trip Removal Misc

Carlton Station Platform 20mm step to coping Carlton Station Platform OB Applied using Draw Box Carlton Station Platform Tecroc not Cured 1 hour Carlton Station Platform OB Trip Removal Misc

Safetrack® Overbanding wins Network Rail product trial for Carlton Station platform.

Project Overview

Network Rail’s Nottingham office identified a number of potential trip hazards at Carlton Station on some of the platforms, close to the platform edge. Where the asphalt and concrete coping meet there was a significant difference in height creating a 15-20mm step along the full length of the platform at the back of the coping. It is thought this had occurred due to the substantial support that the copings had with their brick foundation compared with the rubble fill and asphalt used behind the coping, which is prone to settlement and secondary compaction. 

 

Product Selection

Network Rail’s Nottingham office identified a number of potential trip hazards at Carlton Station on some of the platforms, close to the platform edge.

Unsuccessful attempts had been made previously, using various materials and methods, to remove the step. The method used to date was to cut back the asphalt 300mm from the coping, forming a vertical edge and placing new asphalt to the correct levels. However this method was time consuming and required a lot of organisation and plant to complete the works. This together with the restricted access encountered on station platforms and the proximity of the public made this method impractical and expensive and therefore an alternative was sought.

As part of the search to find a suitable solution Network Rail organised a trial in which both the Safetrack® Overbanding system from Stirling Lloyd and a competitive polyester based system were applied in-situ.

 

The Application

The work was to be carried out in two hour slots as determined by the Network Rail Safety Advisor based on station traffic. After being authorised to occupy the station platform a trial area was identified for each material. It was stressed that the works including preparation, application and return to service had to be completed within the allocated one hour time slot.

Stirling Lloyd’s application teams first task was to clean and dry the asphalt adjacent to the coping.

Due to the difference in movement that would occur between the two materials, tape was applied to the top of the coping to prevent ‘overbanding’ the asphalt and the concrete.

A 200mm draw box was then used, resting on the coping, to create a fillet approximately 200mm x 20mm, with the application of five metres taking about twenty seconds.

Though the repair area consisted of both asphalt and concrete substrates, this proved no issue to Safetrack Overbanding which formed a strong adhesion to both surfaces. Not only was a simple, fast and effective repair to the defective asphalt edge achieved, but minimal labour and plant were required for the works. Safetrack Overbanding, which is cold liquid applied, flowed easily into the problematic area, forming a durable, gently sloping fillet between the two levels.

From gaining access to the platform, the preparation, application and cure was so quick the platform was returned to service in less than twenty-five minutes.

The competing polyester based system is usually used for road frame fixing and had an expected cure time of twenty-five minutes. The area was brushed but allegedly did not need drying. Two components, a resin and filler were mixed into a fairly stiff mortar, with the mix being applied by trowel and a float to the asphalt adjacent to the coping. Preparation and application took about twenty minutes. However after the allocated one hour had passed the material had still not cured.

Summary

Network Rail, Nottingham were so pleased with how Safetrack Overbanding performed they purchased sufficient material for all future station works within the region. By selecting Stirling Lloyd’s HAPAS approved Safetrack Overbanding, Network Rail can be sure that the fillet and their future works will remain sealed and protected against water ingress whilst completely removing the trip hazard that was there previously.

Innovation driven,

service led, solutions based.