Suspected failure of deep drainage had caused instability of a domestic retaining structure adjacent to a busy road. Engineers required demolition of the structure, permanent slope stabilisation, replacement of deep drainage and re-building of the structure all within school holiday periods to minimise disruption.
Our solution involved:
- Controlled Demolition and Slope Stabilisation: Design and installation of Dywidag R32/210 soil nails using lightweight excavator mounted drilling equipment. Installation in conjunction with staged top-down demolition under single lane closure on weekends and school holidays.
- Replacement of Deep Drainage: Excavation below pavement to expose shared sewer. Co-ordination with utilities providers and arrangement of permits. Installation of new underground drainage and tie into shared sewer.
- Re-Building: Placed foundations and re-constructed retaining structure tied into the permanent soil nailed slope. Replacement of steps, landings and landscaping.