HS2 Long Itchington

Project Introduction

Our element of works include the construction of the North and South Portals for the launch of the tunnel boring machine (TBM) that will bore a 1.6km twin bore tunnel under Long Itchington Wood in Warwickshire before the route heads north and into Birmingham’s Curzon Street Station.

Our scope of works include the groundworks and RC works to both North & South portals to facilitate TBM reception into the D -Wall Box.

The Civils Work has been divided into the following two packages to facilitate the TBM drive

Long Itchington Wood North Portal RC works for the TBM setup and drive.
Long Itchington Green South Portal RC and Ground works to facilitate TBM reception into the D-Wall Box.

CLIENT

ROLE

Subcontractor

SERVICES

Demolition

Basement

Modular Buildings

Utilities

Public Realm

DURATION

ongoing

NORTH PORTAL

March 2021

North Portal - What Galldris Delivered

At the North Portal we have delivered the permanent RC works (including all couplers for the walls, stage 2 concrete pours and seal can installation) required to facilitate the 1.6 km TBM drive from Long Itchington Wood to the Long Itchington Green reception box. The process of construction for the northern portal base slab, was working from the rear of the portal structure to the soil nail wall face. Material works were made up of more than 1,000 tones of reinforced steel and approximately 2,000m3 of concrete.

May 2021

Spherical 360 Photo

July 2021

Galldris installed all service roads (including utility services, drainage & culverts) to initiate the works to this high tolerance slab.

SOUTH PORTAL

South Portal - What Galldris Delivered

At the South Portal, we are delivering RC works including backfilling to the roof of the reception box to provide a working platform, and the excavation of the reception box. These works are to facilitate the TBM drive reception and removal of the TBM parts through the roof access.

These works include constructing a transfer slab on top of the Diaphragm walls to allow top-down construction of the TBM reception box, which will see us excavate over 30,000m3 of soil. One of the advantages of this “top-down” method of construction is to enable above ground construction work to be carried out simultaneously with the excavation of the TBM reception box resulting in significant saving of time on the project.