Expert miners start HS2 tunnel emergency cross passages

Aaron Morby 3 years ago
Share

Construction of HS2’s longest tunnels stretching for 10 miles under the Chilterns has begun a new phase with the start of work on thirty-eight cross passages linking the northbound and southbound tunnels.

HS2 completes first tunnel cross passages
HS2 completes first tunnel cross passages

The 15m-20m long escape tunnels are bored every 500m to connect the two main running tunnels around 40m below the surface.

An expert team of miners are using a remotely controlled excavator to break out of and excavate from one running tunnel to the adjacent tunnel.

As the excavation is progressed the ground is supported using a sprayed concrete lining (SCL).

Delivered by HS2’s main works contractor, Align – a joint venture formed of Bouygues Travaux Publics, Sir Robert McAlpine, and VolkerFitzpatrick – each passage is between 15 and 20 metres in length.

This is then lined with a water-proof membrane before a secondary concrete lining constructed behind specialist formwork in the cross passage.

Martyn Noak, HS2’s Head of Tunnel Engineering, said: “While invisible to the travelling public, the cross passages have a key role in providing a safe operational railway.

“In an emergency they allow the safe evacuation of passengers into a place of relative safety – the other tunnel. Constructing cross passages is different than using a tunnelling machine as the ground is excavated in short lengths with each advance being left unsupported for a short period of time until the sprayed concrete lining is installed.

“It is a different set of risks and a specific skilled workforce is needed.”

Daniel Altier, Align Project Director, said: “The completion of this cross passage is a significant milestone for the team at Align JV.

“In partnership with our supply chain; KVJV responsible for the ground treatment, specialist contractor Euro Diamond Drilling and waterproofing specialist Rennesco, the sub-surface team at Align have already commenced preparation work on several other cross passages and are making good progress.”

Once the passageway is complete, the safety doors can be installed at either end. These are being manufactured by Bolton-based Booth Industries who won the contract to provide more than 300 units for all the tunnels between London and Birmingham.

Latest news

Wates wins £111m Victoria Tower restoration

Palace of Westminster's tallest tower overhaul will take six years
5 hours ago

Mace tops contracts league with Euston Tower win

Contractor leads monthly work haul for second month running
6 hours ago

Police hunt boss on the run after site manslaughter charge

Company director fails to turn up to court to face safety charges after site death
16 hours ago

Glasgow civils firm buys building refurb specialist

M Squared buys EBS Construction in move to target £25m sales
6 hours ago

Lynch plant hire fined £800,000 over abnormal load

Travelling excavator caught in police clampdown
6 hours ago

Buyers flag fears over civil engineering slowdown

All sectors in reverse during "challenging" March
3 days ago

Police recover £100,000 of stolen plant at Harwich port

Polish man arrested on suspicion of handling stolen goods
6 hours ago

Winners named for £380m Scottish council housing upkeep deal

PfH Scotland names 38 firms for social housing landlord deal
3 days ago

Torsion and Khalbros to build new Leeds £1bn neighbourhood

Eastgate Quarter site acquired from Hammerson
4 days ago

Kier wins first phase of £700m Warwick Uni campus build

Firm to start work on science and engineering precinct last this year
4 days ago

JCB to double size of US factory in wake of Trump tariffs

$500m Texas factory under construction to expand to 1m sq ft
4 days ago

Green light for £2.4bn Luton Airport expansion

Government go-ahead to transform airport
4 days ago

Mivan looks to boost supply chain network

Subcontractors and suppliers invited to meet the buyer event: Book places now
3 days ago

Diversification pays off for concrete frame specialist Statom

Strong results as £180m turnover firm expands into infrastructure sector
4 days ago

Cardo in talks to buy Breyer roofing arm

More than 100 jobs could be saved at Breyer Roofing
4 days ago

Quartet win £750m Wales & Western railway deal

Network Rail confirms partners for Reactive and Minor Works framework
4 days ago

Plans in for £350m London Bridge life sciences hub

Snowsfields Quarter will consist of three buildings containing labs
4 days ago

Surging labour costs push tender price forecast up

Pick-up in tender prices despite weak growth
4 days ago

Permasteelisa wins cladding deal on Multiplex city tower

Facade specialist wins work on Fenchurch Street ‘hanging gardens’ tower
4 days ago

Wates wins fit-out for Manchester First Street Hub

Smartspace arm secures another Government hub deal
5 days ago

Peel Ports reveals winners for £750m framework

18 firms win places on deal: Full list
5 days ago

Big trade names dropped in M Group rebrand

Acquisitive group formed from Morrison Utility services in 2016
5 days ago

Breyer Group files administration notice

Staff hope rival firm could buy assets and save jobs
5 days ago

Former Severfield director takes helm at Embrace Steel

New CEO Martin Kelly aims to step up expansion of steelwork contractor
5 days ago

£302m upgrade funding awarded to FE colleges – list

Cash shared out between England’s 179 college groups
5 days ago

FK Facades thrives but construction arm hit by ISG row

Dispute with failed contractor costs specialist £5.5m
5 days ago

Galliford Try gets go-ahead for Milton Keynes PRS tower

33-storey tower needs gateway 2 approval before work can start
6 days ago

Small house builders get £150m funding for green homes

Developers will have to meet-up to ten new criteria to benefit from interest rate discounts
5 days ago

Lendlease Construction renamed Bovis

US private equity firm completes £35m purchase of UK contracting business and rebrands
6 days ago

Breyer Group battles for survival as rivals circle

Housing maintenance firm fights three winding up petitions in a month
6 days ago

Contractor services