Articles tagged “CUR96”

As 2022 continues to be an extremely busy time for Lifespan Structures we are pleased to announce that Steven Dunn has recently joined to further strengthen our specialist team. A civil engineer with over 25 years of experience in providing technical and commercial support to Clients, specifiers and contractors he has strong knowledge in specialist areas including structural concrete repair, structural strengthening utilising carbon fibre plate (CFRP), composites, adhesives & ultra-high modulus plates.

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Composites used for FRP bridge

Working together with our sister company Concrete Repairs Limited, and our various other supply chain partners, a new 12.5m by 3.0m wide bridge has been installed. Initially Lifespan Structures were originally commissioned to produce an outline design to allow the Client to carry out the necessary consultation with the relevant statutory bodies, and subsequently develop this to a detailed design ready for the construction phase. The Client’s framework contractor employed Concrete Repairs Ltd to carry out the installation of the new bridge, including new foundations, lifting operations and attachment of parapet.

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Traffic Bridges

Bridge decks often require repairs and eventually replacement during the service life of a bridge. These can be steel, concrete or timber decks for pedestrian and vehicle access. At Lifespan we can design, supply, and if required install, lightweight FRP composite decks which can reduce the deck dead load by 50%. These decks reduce the environmental impact in terms of carbon and energy embodiment. They are also quicker and safer to install compared to traditional materials. The decks are delivered complete with surfacing and ready for installation onsite.

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Bridge design is not just structural performance but also about how a bridge looks and the social benefits that a well-designed bridge can deliver in the context of the surrounding environment. Highways England have recently published a document entitled “Principles of Good Road Design” in an initiative to improve the design process which we fully support. There is an emphasis on innovation using long lasting quality materials which we can deliver with an FRP composite bridge. At Lifespan we work with leading bridge Architects to deliver a design concept based on the brief from the Client.

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We are now in a position to offer vehicle bridges that carry traffic loads shall be designed for BS EN 1991-2 [Ref 4.N] load models (LM) LM1, LM2 and, if appropriate for pedestrians, LM4 which are fully compliant with the latest DMRB standards. We are currently in the design phase for two vehicle bridges to be supplied and installed later this year. We started the business in 2015 and without an established market for moulded FRP composite bridges in the UK we decided to target the local authority sector with footbridges, this has been very well received.

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Information on the design of FRP footbridges has developed quickly over the last few years, with the new version of the DMRB which included the publication of CD368 - Design of fibre reinforced polymer bridges and highway structures, and the updates to recommendations in Europe such as CROW-CUR recommendation 96-2019 Fibre-reinforced polymers in buildings and civil engineering structures (CUR96)
Whilst CD368 is now very much in line with CUR96, there are still some fundamental differences between the 2 documents.

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We are pleased to offer a new CPD introducing our Footbridge Management Service.  To book this CPD please contact martin@lifespanstructures.com
Tailored to the requirements of all footbridge owners and stakeholders the CPD is identifies the key actions required during the life of a footbridge, from initial concept to end of service and everything in between. Through Lifespan Structures we will introduce the services that are available to develop, manage and maintain a footbridge portfolio via our group of companies, and see how we can offer a solution to wide range of footbridge management issues.

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Resin Infusion of composite materials

We have published a technical paper to help clients and specifiers understand the significant differences in terms of installation, performance and long term maintenance of the different types of FRP bridge solutions that are available. There are two generic types of FRP composite bridges and they have quite different performance characteristics and maintenance requirements, so it is important for clients to understand the differences at the procurement stage. Moulded bridge decks are generally manufactured in a mould with dry fibres laid in specific orientations with a core material to produce a sandwich construction.

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FRP Moulded Footbridge

The Client had recently purchased additional land to extend an existing park and wanted two footbridges across a small stream to gain access to the new land. Lifespan Structures recommended an FRP composite bridge supported on screw piles with a timber parapet to compliment the environmental location. The Client commissioned Lifespan to undertake a topographical survey, and borehole survey for the proposed locations. Lifespan then provided an Approval in Principle (AIP) for the Client and proceeded to design the two bridges followed by manufacture and delivery to site ready for installation.

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Composite footbridge

Off site production allowed us to continue with this project during the lock down.  Once restrictions were eased the existing bridge was removed and the foundations upgraded by CRL working for Kent Highways, before the new bridge was installed in June. KCC Cabinet Member for Highways and Transport, and Member for Tonbridge, Michael Payne said:
“This work was carried out to provide a strengthened and refurbished bridge to ensure it continues to be safe river crossing for the public to use. “The original deck was made from railway rails with a type of expanded metal mesh reinforcement, but unfortunately it wasn’t able to handle the number of people using it.

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