A41/A406 Brent Cross Structures

Location: A41 / A406 Brent Cross Interchange, London
Client: Transport for London
Partners: Costain; Henderson Thomas Associates; ConeMasters
Year: 2018
Sector: Highways & Transportation |
Specialisms: Asset Management | Bridge Engineering | Civil Engineering | Project Management | Structural Engineering | Surveying |

Pell Frischmann was appointed by Transport for London (TfL) to undertake Stage 1 Outcome Definition and Stage 2 Pre-Feasibility studies of 29 highway structures at Brent Cross Interchange. The major interchange, which services the A406 North Circular Road and the A41 Hendon Way, is a key transport link in the north of London.

As part of TfL’s Structures and Tunnels Investment Programme (STIP), the assessment, strengthening and refurbishment of the structures were used to address their State of Good Repair, safe performance and management plan.

What we did

We undertook an Output Definition to develop the scope and define key objectives with the client. Following this, our Bridge Engineers carried out Pre-Feasibility studies to determine the current condition of the existing structures and establish a series of maintenance measures needed to bring the condition of each of the structures to the required level. A broad range of activities were undertaken which included the following:

Historical Data Review
Gap Analysis
Inspections and Surveys
Special Investigations (joints & bearings)
Structural & Articulation Investigations
Concrete Testing

Post Tensioned Special Inspections
Traffic Management
Asbestos Surveys
Confined Space Inspections
Drainage Surveys
Waterproofing

This enabled us to progress the optioneering for essential maintenance, repair, upgrading and strengthening of various key structures on the junction. ECI (Early Contractor Involvement), whole life costing, health safety and environmental impact studies formed part of our approach in developing a holistic review to ensuring that the entire life cycle of each asset was considered.

As works continued through utility upgrades and football games within the area, our close collaboration with TfL, supply chain and partners, allowed us to safely and successfully deliver the scheme under a challenging programme.

Outcomes

We produced detailed management reports providing analysis and recommendations for the effective maintenance and asset management for 5 key structures of the major interchange. This included the development of tailored risk profiles to ensure the structures remain safe and functional up to 2025 in preparation for the planned construction works of the Brent Cross Development.

Kirit Patel, TfL’s Project Manager for Brent Cross Structure said:

I would like to thank each and every single one of you for your individual contributions which led to the great success of delivering well-structured and comprehensive Management Plans for the five key structures on the Brent Cross Interchange; without your individual contributions the project could not have delivered the scheme to programme and within budget.

A big thanks to Dr Sas Majlessi and Adam Wedderburn at Pell Frischmann and their team who pulled out all of the stops to deliver on a tight programme. It’s been a pleasure working with you and your team, I believe these plans will make a difference going forward in the management of these assets.