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Case Study – Underpass Propping, A41 West Bromwich

Project: Underpass Propping A41 West Bromwich

Customer: Sandwell Borough Council

A41 Undepass Propping Case Study   Sandwell Borough Council Under Propping at A41

As part of a major intersection upgrade just off Junction 1 on the M5, MGF was approached by Balfour Beatty to design and supply a significant temporary works scheme. The creation of a new underpass under the old roundabout would alleviate the heavy traffic congestion experienced at the junction.

MGF was involved with the scheme from very early in the tender process and spent the best part of 12 months working in partnership with Balfour Beatty to prepare the design. This job was challenging and complex for MGF due to the large number of props and the limited access times for installation.

MGF provided props supporting a 204m section using a total of 43 large props. The scheme was split into 3 main stages – the central, west and east sections.

The design for the central section comprised 6N° MGF 2500kN Hydraulic Struts combined with MGF 1000 Series Strut Extensions spanning 25m. This formed the 1st stage of the excavation work.

The west section was supported by 19N° MGF 1250kN Hydraulic Struts combined with MGF 400 Series Strut Extensions spanning 19m.

In the east, the section was supported with a series of 18 N° MGF 1250kN Hydraulic Struts combined with MGF 400 Series Strut Extensions spanning 19m. Structural detailing was complicated by the fact the west and east section props raked
in both plan and section.

The A41 contract represents MGF’s largest ever supply of hydraulic props to a single site. A tremendous achievement to all those involved and a milestone in MGF’s history

View our video case study for details of the installation process and the use of 3D visualisation to demonstrate the benefits of off site assembly to decrease installation time.

Download the full case study PDF here: A41 Underpass, WestBromwich – Apr 2012.pdf

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