What are the best value bridges?

Posted on: 24 April 2020

What are the best value bridges? There are two costs to take into account when looking at a the purchase of bridge. Firstly the Capital Cost to buy and install the bridge. This will be minimised if the foundations are provided by the bridge deck supplier. Most manufacturers do not offer this service but can put you in touch with a specialist installer. Joined up projects are the least problematic. Secondly the future maintenance costs of the bridge over its life. Decisions taken at the procurement stage will impact the bridge all through its life. Sadly vandalism is an increasing issue. Money to maintain bridges is and is likely to remain in short supply. There is little doubt that steel bridges last longer than timber ones and even longer if galvanied rather than painted. They are less prone to vandalism other than graffiti.   Steel bridges do not burn.   Your Bridge designer thinks that steel bridges with a galvanised finish are...

What is a compliant bridge ?

Posted on: 16 April 2020

It is desirable to practice defensive purchasing when sourcing a bridge.   In the event of an accident and a law suit the question will be asked “Is the bridge a Compliant Structure?” This begs the question about what is a Compliant Structure.   The answer is not simple. The bridge should be designed by competent people (suitably qualified and experienced), it should be precisely made from the materials specified by The Designer and by competent trades people and it should be installed onto a suitable foundation by competent and experienced people.   In more detail the bridge should be designed to the relevant Euro Codes (which have replaced BS)   Manufacture should be carried out with in an appropriate Quality Assured system by people with relevant expertise.  

Elena is coming

Posted on: 09 April 2020

Elena is coming! Blackburn and Roberts have always been innovators. The Rowsander Path Pipe was a product for the 1980s The Kingshurst Bypass kerb for the 1990s The Nib Nobbler tool the 2000s by storm and the Servisafe Data Duct caused waves in the 2010s Now Elena is coming. A unit to collect water which has percolated though permeable drainage. Embedded in an impermeable coating it is completely covered by the permeable surface – except for access and rodding points. Water enters through openings in the side walls and travels along the duct to be discharged into drains.  

Galvanise Or Paint

Posted on: 02 April 2020

At some point the finish on the steelwork arises on every project. The choice is between painting or galvanising. Our clients favour galvanising. This is a process which offers the best long term protection. Painting is less resistant to vandalism and when it is vandalised it looks worse than a galvanised finish. Both finishes look good with wooden deck and parapet When we make trusses the galvanising gets inside the sections and stops them rusting from the inside out. Installers also prefer the galvanised finish as it is less prone to damage during delivery and installation. When used by Utility Companies they prefer the galvanised effect. Future Maintenance costs are a major issue. It is difficult and expensive to repaint a bridge in position. Preventing pollution of the river/reservoir is costly. A painted bridge will need a re-paint every 15/20 years but galvanised steelwork will last for up to 70 years before it needs attention.