Digging starts on Hull’s most expensive and biggest ever hole

digging-starts-on-hull’s-most-expensive-and-biggest-ever-hole

Digging starts on Hull’s most expensive and biggest ever hole

Digging starts on Hull’s most expensive and biggest ever hole
2021-08-06 04:00:00
Work has started on digging the biggest and most expensive hole ever seen in Hull. An estimated 40,000 cubic metres of material will be excavated over the coming months to pave the way for a new 400m-long underpass on the main A63 route through the city centre and close to Hull Marina. Read more: Tributes to 'inspirational' funeral director after sad death When completed, it will form the centrepiece of the ongoing £355m improvement scheme in Castle Street, replacing the existing Mytongate junction.. The underpass will take east and westbound traffic under a new elevated road bridge linking the southern end of Ferensway to Commercial Road. How the Castle Street underpass will look when it is finished Its construction is being seen as the most complex part of the whole scheme, not least because of the high water table and associated tidal conditions in the immediate area. The last major tunnel project in Hull ended in failure in 1993 when work to build a road under the River Hull had to be abandoned because of flooding problems. It was later replaced by the Ennerdale road bridge. At Castle Street, ground engineering work on the underpass is being carried out by specialist German-based tunnelling firm Züblin Ground Engineering working alongside main project contractors Balfour Beatty. To sign up for the Hull Live newsletter, click here. The company's most recent project was a 1.6km-long underpass in the German city of Karlsruhe. Fran Oliver, project manager for Highways England, said: “As a major scheme full of complex work in a busy city centre, it presents several unique engineering challenges. This latest and integral part of constructing the underpass is arguably the most complex. “We are on track for the scheme and I appreciate drivers and residents' patience as we endeavour to keep any disruption to a minimum.” Over the coming months, contractors Balfour Beatty will install large piles into the ground up to 30m deep and under water to reduce noise levels. The piles will be driven into the ground at a depth of up to 30 metres and will be connected to the base of the underpass to prevent it floating on saturated subsoil. The base itself will be formed by a installation of a layer of high-pressure cement-based grout below the finished road level. Video Loading Video Unavailable Click to play Tap to play The video will auto-play soon8Cancel Play now Its design is aimed to seal out any water from below and grip the piles, adding tension into the system to prevent the underpass from floating. The first batch of 200 wall reinforced concrete panels designed to line the underpass will also be inserted. Each panel is 3.4m wide and 20m deep. Overall, 4,000 cubic metres of concrete will be used during its construction. The Commercial Road exit onto the A63 in Castle Street Richard Green-Morgan, construction manager at Balfour Beatty said: “Today marks a significant milestone on the A63 Castle Street improvement scheme, with our expert team starting the construction of Hull’s new, critical underpass. “Utilising our in-depth knowledge, we look forward to safely and successfully completing this complex scheme; a scheme that will not only reduce journey times but connect communities across the region. “We would like to thank the public for their continued patience while these essential works are underway.” The new road bridge spanning the underpass will be made up of 52 beams, each one weighing six tonnes. They will form th

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