Contractors World


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Contractors World UK & Ireland
2012 Vol 2 No 6   
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Minimum time to demolish a 1,400 tonne bridge over the M1 - page 2 of 2

The bridge demolished is at the top of the picture, following completion of a new, wider bridge.This included resurfacing the MSA slip roads, removing lighting columns between Junctions 12 and 13, erecting two gantries and additional gantry signage elsewhere, laying permanent road markings between Junctions 12 and 13 and making central reserve barrier improvements.

The bridge demolished is at the top of the picture, following completion of a new, wider bridge.

Along with the bridge demolition, testing of the managed motorway technology and opening and closing the hard shoulder for traffic continued between junctions 10 and 11, with the section fully operational by mid-July. The technology has resulted in a hard shoulder assigned as available to traffic at busy periods to give additional capacity. Work on the remaining sections between Junctions 11 and 13 continues.

Using the hard shoulder removes the requirement for widening, as it provides additional capacity through use of the hard shoulder. Currently used only on the M42 and M6 in the West Midlands, the M1 will employ it under the direction of the Highways Agency East Region Control Centre when required.

This is the same technique used to demolish the Catthorpe viaduct at J19 of the M1 in January this year. Proven method used

This is the same technique used to demolish the Catthorpe viaduct at J19 of the M1 in January this year. The reinforced concrete bridge, which carries the old A5120 over the M1 has not been used since a new bridge opened in May.

The demolition contractors, Armac Group, were required to use as much equipment as they could get on to the site in order to meet the short time demands. Cat excavators worked alongside Komatsu and Volvo machines equipped with a variety of hammers, shears and buckets. Cat articulated dump trucks were used primarily to haul material off site for recycling.

Water misters were used to control dust, and 150 mm timber matting was laid beneath the drop zone plus and additional 10 m either side to protect the carriageway.

The bridge decking was removed first followed by the central piers and then the abutments. Working under lights, the task progressed throughout the night with additional work beginning as soon as was practical and safe to complete the project as quickly as possible.

Demolition was necessary to make way for new slip roads at Junction 12, as part of the M1 J10 to J13 managed motorway scheme.

With the bridge demolished, worked quickly progressed to installing barriers and other installations.Highways Agency project manager Lynne Stinson said: “Work on the managed motorway scheme progressed very well and we’re delighted the first phase was completed this summer, and that we’re on target for full scheme completion in spring 2013.

“Demolishing the bridge at Junction 12 was a big engineering feat, and the only way that we could remove it safely and quickly is by closing the motorway.

With the bridge demolished, worked quickly progressed to installing barriers and other installations.

“The closure unavoidably caused some disruption for road users, but to keep it to a minimum we timed the works for a 16 hour period at the weekend when traffic flow is at its lowest.”

The bridge was designed by Sir Owen Williams and Partners and built in 1959 by John Laing plc. It was 17 metres wide and 41 metres long. [CWMAGS]

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Page updated: August 2012

 

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