VVB

Road

A505 Baldock Weston Hills Tunnel Maintenance

Contract Value £3m
VVB Highways Maintenance division has proactively demonstrated its collaborative approach to working with Hertfordshire County Council to support the Employer’s asset management strategy, offering best overall value for the continued maintenance of the Weston Hills tunnel. Although the Weston Hills tunnel is exempt from the 2007 Road Tunnel Safety Regulations it is the Employer’s intent to deliver the works in the spirit of that legislation. During the course of the maintenance contract VVB may also be carry out refurbishment or upgrade work to the existing systems.

VVB Engineering is very familiar with this 250m twin bore cut-and-cover tunnel which forms part of the 6.5km bypass of the town of Baldock. The business was appointed by Norwest Holst to project manage the mechanical and electrical installation and fit-out of the tunnel during its construction, working closely with the tier one contractor and the client to help deliver the construction works an impressive eight months ahead of schedule.
The primary works covered under the maintenance contract, managed by CAT2 response operatives, include:

POWER DISTRIBUTION

  • LV Switchboard
  • UPS (Emergency)
  • Transformers
  • Tunnel Earthing
  • Electrical Distribution Panels and emergency panels
  • Cabling
  • Main Distribution board

TUNNEL SERVICES BUILDING – BUILDING SERVICES

  • Luminaires
  • Small power
  • Ventilation and Air Condition
  • Gas Sensor
  • Fire Detection and Suppression System
  • Programmable Logic Controllers (PLC’s)
  • Intruder Alarm Security Panel

LIGHTING AND DALI CONTROL

  • Luminaires
  • Photometers
  • Lighting Controls

PUBLIC ADDRESS SYSTEM

  • Public address system

RADIO REBROADCAST & GSM

  • Radio system

FIREMAIN

  • Fire main
  • Fire Pumps
  • Fire Hydrants

CONTAINMENT TANK AND DIVERTER VALVES

  • Diverter valves / penstocks
  • Argonite / Nitrogen Foam System
  • Spillage Containment Tank and Cess Pool Tank

ENVIRONMENTAL SENSOR

  • CO2/ VIS Sensor

CCTV SYSTEMS

  • CCTV Cameras

TUNNEL EMERGENCY SERVICES

  • SOS and Wayfinding signs
  • Cross passage doors
  • Emergency telephones
  • Fire extinguishers

TRAFFIC SIGNS

  • Lane control signs
  • WIG-WAG signs
  • Variable message signs
  • Removable barrier Sologuard

SCADA SYSTEM

  • SCADA server
  • Remote PC’s

TUNNEL WALL WASH

  • Tunnel wall washing

TUNNEL DRAINAGE

  • Tunnel drainage system