Champlain Bridge Advances - page 5 of 5
Everything we’ve done on the cable-stayed jetty has led up to today’s major and symbolic step for the new Champlain Bridge. After this, we’ll be able to start raising the main pylon, which will emerge as one of the key features of the bridge,
explains Frédéric Guitard, Signature on the Saint Lawrence Construction Manager for the cable-stayed bridge.
Each footing will then be capped by a pier base to be poured in place, and subsequently topped off by other pylon segments prefabricated off-site for LEGO-style assembly until they reach the bridge deck. Once that part is done, work on the upper pylon can begin.
The demolition of L’Île-des-Soeurs Bridge
The old bridge has now been demolished. The work was carried out by three demolition excavators equipped with nibblers, sitting atop a floating barge. The debris landed on the barge, thereby protecting the channel and ensuring that the water quality was not affected.
At the end of each day, the giant barge was moored on the bank and its contents unloaded. The debris was then transported to authorized sites by truck; this activity took place in the evening and at night.
This project’s execution, i.e., the successful demolition of some 60,000 tons of material, was made possible by around 20 people who work at the site during the day, in the evening and sometimes even on weekends.
To minimize the impact on residents living near the site of the work, the contractors must comply with all of the environmental requirements, and particularly those regarding noise and air quality, dictated in the partnership agreement with the Government of Canada.
Regular monitoring was done to ensure that the noise generated during the demolition stayed within the established thresholds.
Motorists will be able to travel in both directions on the new Île-des-Soeurs Bridge in 2018.
Managing the Large Segments
In August 2015, the UK company, DLT, was awarded the contract by main contractor, Signature On The St Lawrence Construction Group ,to supply a DL-MT1000 Mega Transporter and a 1000 tonne capacity 2.5 m stroke jack up system for handling precast concrete sections of the New Champlain Bridge side spans.
The bridge footings and piers of the side spans are precast on land and then placed into position by a floating crane. The precast footing and pier units weigh up to 1000 tonnes and are up to 11.37 m high. The equipment was delivered to site and commissioned in February 2016 .
The Main Contractor needed a solution for transporting the precast units around the casting yard that would be as compact as a ground level skid system, but as fast and flexible as a self propelled modular transporter (SPMT).
Standard SPMTs were considered for the project, but would be too long to turn within the narrow confines of the site.
The DL-MT1000 Mega Transporter provided the perfect solution. It uses aerospace tyres to give 4 to 5 times the load carrying capacity per axle line of a conventional SPMT, and as a result is much shorter.
It is controlled by an operator that walks along side the transporter using a wireless control unit. It is able to drive around a curve, drive diagonally and rotate about its centre point (carousel) at a full load speed of 1 km/hr and an unloaded speed of 3 km/hr.
For this project the transporter is supplied with an electric motor driven hydraulic power pack that is powered using a locally hired diesel generator.
The 10 m x 10 m x 2 m thick precast footings are cast at ground level, and are then lifted using a DLT supplied synchronised jacking system so that they can be loaded onto the DL-MT1000.
The jack up system uses four 300 tonne capacity 2.5 m stroke rams which are synchronised using the DL-P40 computer control system.