The project involved the construction of a sewage treatment plant (STP), a 16.5 km Deep Gravity Sewer (DGS) with 50 Shafts and network connections. The shafts were constructed with 42-54 secant piles, to facilitate and receive the micro-tunneling heavy equipment and pipes that would be ‘jacked’ into position for the sewer network. After the pipeline installation, the shafts were used as manholes. The challenge included daily monitoring while micro tunnelling was done simultaneously at 10 locations with 10 pipe jacking machines with an excavation of shafts continuing at a few places.
Encardio-rite was responsible for the complete monitoring and surveying solutions for the project. It provided turnkey services like pre-construction building condition survey, post-construction building condition survey, supply and installation of geotechnical sensors, optical surveying, reporting with interpretations, and calibration of data loggers and sensors.
An experienced and proficient team of Encardio-rite provided installation, monitoring and surveying services for 3 years. The pre & post-construction survey of almost 300 structures and 200 utilities was completed successfully. Monitoring reports were submitted on a daily, weekly and monthly basis.
The instrumentation scheme included an inclinometer, piezometer, borehole extensometer, surface settlement points, building settlement points, tiltmeters, prism targets and portable data loggers and survey equipment.
All the monitoring and reporting was done in time which satisfied all the stakeholders. The project proudly recorded over 10 million safe man-hours without a lost-time incident on the project.