Owner
Kent County Council
Client
Tony Gee and Partners for Balfour Beatty
Cost
£12 million GBP
Timeframe
October 2020
— April 2021
Services performed
Tunnel design, ground movement analysis, impact assessment on existing utilities.
Description
Bean Tunnel is a proposed development to provide a Fastrack busway and a shared footway/cycleway route linking Eastern Quarry (proposed location for the Garden City) and Bluewater in Kent, southeast England. This development will comprise a new bore tunnel (Bean Tunnel) and associated road works to include bi-directional bus, cycling and pedestrian access between Eastern Quarry and Bluewater.
The approximately 80 m long, 11 m wide and 9 m high new tunnel will run under the existing B255 highway route as well as utilities for water, gas, and power. The tunnel lining system comprises a steel fibre reinforced (SFR) sprayed concrete primary lining, a spray applied waterproofing membrane and an SFR sprayed concrete secondary lining arch.
The approximately 80 m long, 11 m wide and 9 m high new tunnel will run under the existing B255 highway route as well as utilities for water, gas, and power. The tunnel lining system comprises a steel fibre reinforced (SFR) sprayed concrete primary lining, a spray applied waterproofing membrane and an SFR sprayed concrete secondary lining arch.
Geology
Upper Chalk.
Location
Kent, UK
Highlights
- SCL tunnel in chalk
- Spray applied waterproofing membrane and sprayed concrete secondary lining arch
- Ground Movement Assessment and Utility impact assessment
An artist's impression of what the tunnel will look like (courtesy Tony Gee)
Tunnel cross-section