One Za’abeel Towers

This development comprises two towers—a 305 m high Tower A and a 240 m high Tower B—with commercial and residential spaces. The Towers are being constructed on either side of the Al Saa’da Road Bridge, which passes through the center of the plot. The automatic online monitoring method was adopted, taking into consideration the criticality of safety monitoring of the Al Saa’da Bridge.

Moreover, the six-level basement car parking required excavation to depths ranging from 23.8 m to 25 m below ground level. Additionally, the basements were connected by two tunnels underneath the existing elevated road that bisects the two towers. This again required monitoring work.

Thus, monitoring work was divided into three sections

• Bridge monitoring
• Pier monitoring
• Ground/Shoring wall monitoring

Encardio Rite won the subcontract for the monitoring work, which included monitoring the pre-construction condition of the Al Saa’da Bridge, supply, installation, manual and automatic monitoring, and surveying. Instruments used included astrain gage, prism targets, andtemperature sensorsfor monitoring the bridge and the pier. Inclinometers,piezometers, and prism targets were used for monitoring the excavation work.

Online monitoringwas done for criticalgeotechnical sensorsusing advanced automatic data loggers and data acquisition systems. Prism targets installed on piers were monitored using 3automatic total stationsand complex control boxes with a 20-minute monitoring frequency. All the monitored data (automatic and manual) was available online through ourweb-based data management systemfor the Contractor, Client, and Consultants.