A basement excavation for a new mixed-use development of retail, office and residential space on an island site on the corner of George Street, Westminster required a temporary propping scheme. The client consulted with Conquip after having had a propping plan drawn up as they were concerned about the lack of value engineering built into the design. We took on the temporary propping design and our engineering team remodelled the scheme to rationalise the number of elements and simplify the current incumbent design in order to make it more efficient and within the client’s budget.
Conquip took on the whole ground engineering programme, from remodelling of the design to manufacture and installation of the props.
The improvements to the propping scheme included:
- Reduction in the number of flying shores from 8 to just 3, for increased spacing to allow for a faster excavation, as well as for commercial advantages from client.
- Replacement of the complex, bespoke trellis structural steel corners with a simple knee brace arrangement to allow for a faster basement pour.
- Strategic locationing of all temporary elements to ensure they did not clash with any of the permanent works, such as columns and lift cores.
Our project delivery team collaborated closely with the project team to design the makeup of the props and continuous waling beam around their program of works. The design was worked around the installation of the tower crane, efficient transport movements were planned for minimal disruption and we ensured that the weight of all components were within lifting capacity of the client’s standard hire fleet offering on site, which prevented the need to hire in specific machinery and escalating costs. A Conquip senior engineer was at site on hand during installation to train the client installers to make sure installation for safe and efficient.
The propping materials on site are being rented from Conquip, rather than purchased, which means that not only does the client not have the hassle of storing or scrapping after use, it is also more sustainable practice as they will be removed and used on future schemes.