Crossrail is inviting tenders for the construction of the access shafts and sprayed concrete lining station tunnels at Liverpool and Whitechapel.
The work includes the construction of platforms, concourses, cross passages and escalator tunnels using sprayed concrete lining techniques, as well as the construction of temporary access shafts.
The projects will also involve the transportation of all excavated materials from the works by road to transfer stations on the Thames.
The Liverpool Street contract is set to last around 47 months. The Whitechapel contract is shorter at 37 months. Tenders are being invited for one or both lots.
The time limit for receipt of tenders or requests to participate is 15 December.
Scope of works
The Liverpool Street and Whitechapel Station Tunnels comprise the construction of access shafts and Sprayed Concrete Lining (SCL) tunnels. The scope shall include:
- the review of the Employer’s designs, during a preconstruction period to improve buildability and to mitigate risks;
- the construction of platform, concourse, cross passage and escalator tunnels using sprayed concrete lining techniques;
- the construction of temporary construction access shafts;
- the transportation of all excavated material from the works by road, to pre-designated transfer facilities adjacent to the River Thames. The disposal of excavated material from these locations shall be the responsibility of others;
- temporary power, lighting, ventilation, drainage and communications systems to provide the works which will be left behind for the follow-on system-wide contractors;
- the provision of temporary invert fill to the platform tunnels to enable the running tunnel TBM’s to be pulled through;
- provision of all temporary works including responsibility for the design thereof;
- the security of the worksites;
- monitoring of affected buildings and utilities/services for settlement during tunnelling operations;
- the implementation of settlement mitigation measures including compensation grouting and other geotechnical techniques;
- all temporary facilities and services required to provide the works; and
- fulfilling all of the duties of the Principal Contractor under the Construction (Design and Management) Regulations 2007.