CPM stepsafe modular platform
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CPM stepsafe modular platform

The stepsafe modular system This brochure gives outline details and history of the Stepsafe platform system The system can be used for new build and the extension of existing platforms. It can be built on various types of pile or strip footings depending upon ground conditions and localised services. The system is manufactured and sold by the CPM Group Ltd, in association with Mott MacDonald Ltd, the original designers and part owners of the Intellectual Property Rights to Stepsafe. Key staff at CPM have collaborated with MottMacDonald on the development and promotion of Stepsafe since its...

Why use stepsafe modular platform systems The CPM stepsafe solution A solution to the increasing demand for rail travel is the creation of extra capacity by the use of longer trains. Many existing station platforms are too short but provision of platform extensions is restricted by the requirement to: Work within existing train service patterns and passenger occupation Work in track possessions Minimise disruption Following the success of the Warwick Parkway station platform construction, Laing Rail and Mott MacDonald developed and patented ‘Stepsafe’ to overcome these restrictions....

Stepsafe principal advantages Foundations, either strip footings or piles, are constructed in ‘Green Zone’ Superstructure erection involves assembly of factory-made components and avoids ‘wet’ trades The assembled structure requires only the addition of lightweight copers, tactile slabs and fencing before being brought into use. Off-site component manufacture minimises site storage requirements. Significant time savings can be achieved, with less disruption to rail users and operators, and reduced risk of cost and programme overrun. The system was developed initially for use on the Chiltern...

Construction of a new platform at Denham, on the Chiltern line More recently, construction of a new platform at Denham, on the Chiltern Line, was completed in 2008 and a new platform extension at Stratford Station is currently underway. stepsafe - the platform to build on

Generic stepsafe construction sequence Install piles/foundations - undertaken in operational railway environment The Stepsafe system can be supported on piles or strip footings depending on the geotechnical conditions and site specific constraints. Piles offer flexibility in avoiding existing infrastructure which might be required to remain in place for the operation of the railway during construction. Pile caps are constructed on top of the piled or strip footing foundations. A Macalloy bar is cast into the pile caps to secure the crossheads units into position. Careful attention needs to...

Construct pile caps - undertaken in operational railway environment Formwork for pile caps Applying bearing material to pile caps for precast concrete units Finished pile caps for precast concrete units stepsafe - the platform to build on

Install crosshead units - undertaken in engineering hours The crosshead precast concrete units are installed on top of the pile caps. The units can be lifted on to the pile caps using road rail plant or lifting equipment. The cross heads are set at the correct lateral position and height to ensure the correct guage is acheivable when the coping is installed. Install Longitudinal Beam - undertaken in Engineering Hours The longitudinal precast concrete beams are installed between crosshead units in the preformed pockets. Technical rubber shimsare used to bed and take up the fit when placing...

Install cable trays - undertaken in operational railway environment The longitudinal precast concrete beams have sockets cast in to support cable trays between the longitudinal beams. Cable trays being installed between longitudinal beams and along formed holes within crosshead The longitudinal precast concrete beams have sockets cast in to support cable trays between the longitudinal beams. stepsafe - the platform to build on

Install Slab units – undertaken in Engineering Hours Installing slab units on top of longitudinal beams using a road railer The slab units are lifted into position using road rail or lifting equipment and are supported on the longitudinal beams. The slabs units are installed on a bearing material applied to the longitudinal beams. The slabs are secured into position using steel plates beneath the slab which fit into formed recesses in the longitudinal beams.. Miscellaneous items - undertaken in Operational Railway Environment Items such as fencing, signage and lighting columns can be...

Installing items such as fencing, lighting columns and signage Installing miscellaneous items such as fencing, lighting columns and signage Installed fencing at back of platform stepsafe - the platform to build on

Install Lighting columns and sealants Lighting columns and sealants between the slab joints are installed during engineering hours, due to the size of the lighting columns, and also due to the requirement of sealing up to the platform edge of the slabs. However cabling for the lighting columns can be undertaken during the normal operation of the railway. Lighting columns are not required for the Whitechapel Platform 4 widening project. Install tactile slabs, copers and platform lining Copers are installed using a track gauge to ensure the required offsets and heights are achieved. Mortar is...

Using stepsafe over traditional platform construction methods Storage, logistics, delivery and cranage of materials Stepsafe has numerous advantageous over traditional platform construction techniques which are detailed below; There are less materials required for a typical platform construction using the stepsafe system over traditional methods which results in the following being reduced; Site storage space, Movement of materials on site, Craning materials into the site The approximate amount of units / materials required to be craned or railed into a site requiring a 140m long new...