Work to construct a new quay in Norway’s Åndalsnes region is nearing completion.
Main contractor Kristiseter AS was tasked by Molde and Romsdal Harbour to extend the existing quay to accommodate the increasing number of larger cruise ships travelling on the fjords along the main route for tourists visiting the Northern Lights.
Kristiseter enlisted the services of RMD Kwikform and Norway-based Teknikk to provide a solution to construct the new 17m by 17m pier, which will connect to the existing structure by a 60m long, 4m wide foot bridge. The companies worked together to design an over slung support solution.
RMD Kwikform export sales and business development manager Martyn Henry said: “The new quay is a 17m by 17m insitu concrete structure, situated on eight steel piles, measuring 1.2m in diameter, and secured to the fjord bedrock 70m below water level. The quay is being cast in two stages, commencing with the concrete beams and followed by the concrete deck.”
One of the challenges RMD Kwikform’s engineering team faced was to provide a soffit support for approximately 780t of concrete, consisting of 1.2m deep concrete beams, with a 0.7m deep concrete slab above. However, due to the location of the concrete beams, situated at only 0.7m above the water level, the temporary works could only be supported by the eight tubular steel piles which formed the foundations for the entire quay.
The team decided to use a hanging system for the framework which uses a suspended soffit system with all of the core structural support above the quay. The suspended soffit is supported by 180 20mm hangar ties, which consist of two layers of Superslim Soldier primary beams, one layer of timber secondary beams and plywood, all off which is fitted around the tubular steel piles. The hangar ties run through the entire concrete structure, and down to the lowest layer of beams in the soffit, beneath the water level.
Teknikk project manager Morten Hernes said: “Kristiseter AS cast eight steel support posts into the top of each tubular steel pile. Each of these posts protrudes above the top of the core quay slab. Steel header beams then span between adjacent support posts, providing four additional support points at each corner of the quay.
“Two groups of 22m long Rana beams span between the top of the header beams, and provide the support for five R700 truss modules, which in turn are 19 metres long and span at 90 degrees to the Rana beams. There are also wedge jacks situated between each Rana beam and R700 truss; this ensure the load can be easily released, without the need to undo all of the hangar ties.”
Henry added: “The site team are undergoing work in freezing temperatures and working against the rising tide, day in, day out. It was vital that we provided the main contractor with a simple and efficient solution that allowed for maximum productivity during low tide.
“To make the removal of the equipment easier we have provided waler plates on the hangar ties, these prevent the plastic tie sleeves from lifting during each concrete pour. The waler plates can also be screwed down on to the top of the hardened concrete, allowing the suspended soffit to be held in position whilst the equipment above the quay is removed.”
The quay is expected to be complete, with the footbridge in place, ready for the summer cruises in June 2016.