GROUNDFORCE SHORCO has supplied its recently developed Modular Maxi Brace hydraulic shoring system to support a large excavation for construction of a surface water attenuation system near Rotherham.
The company, which specialises in excavation support systems and piling equipment, was awarded the £22,000 contract by main contractor Admiral Construction.
Brookfi elds Park is a 34ha, mixed use scheme being developed by St Paul's Developments. The £200M project - a significant development for the regeneration of this part of South Yorkshire - comprises industrial, warehousing and office buildings totalling 111,000m2.
The huge attenuation system comprises large underground tanks to collect water, allow settlement and control discharge to local water courses.
The excavation is 107m long, 6.7m wide and 4.5m deep and is supported by Larssen 603 steel sheet piles and Modular Maxi Brace waling beams in conjunction with 50t capacity MSK mechanical struts from Groundforce Shorco.
The company claims the Maxi Brace's simple pinned connections make it quick to install and enables it to be used in irregularly shaped excavations.
Site workers drove the 6m long Larssen piles to full depth, providing a 1.5m toe-in below excavation formation.
This propped cantilever design means that only a single support frame is required to shore up the sides of the excavation. The high bending capacity of the modular maxi waling beam resulted in cross strutting being only required at 9m centres, providing good working room for construction of the attenuation tank.
High load capacity Mega Brace frames created even larger 14.2m clear openings at either end of the excavation, to allow three 1.5m diameter plastic pipes to be fed into the excavation.
Steve Savage, contracts director at Admiral Construction, said: 'The works were very close to a major road so it was essential to adopt a system of shoring that provided a fl exible design offering ease of installation in conjunction with the excavation works.'