Imagine Panaji Smart City Development Ltd. (IPSCDL) today announced the successful drawing of a 700 mm diameter HDPE pipe using the Horizontal Directional Drilling (HDD) method, spanning from the Fire Department ground at St. Inez to the Sewage Treatment Plant (STP) at Tonca.
The HDD method involves drilling a precise underground path from one point to another, allowing the pipe to be drawn without the need for extensive on-ground excavation. This innovative technique minimises surface disruption and is ideal for navigating obstacles like roads, waterways, and existing utility lines. The final stretch covered a length of 180 metres and showcases the city’s commitment to modern, efficient infrastructure solutions, stated a press release.
CHALLENGES & TECHNICAL DIFFICULTIES ENCOUNTERED
Existing Running Sewage Line:
The presence of the existing sewage line at a depth of about 4.5 metres required drilling at a depth of 6 metres, to avoid damage. This added complexity to the project but ensured the safety and integrity of the existing infrastructure.
Crossing of St. Inez Creek:
Boring under the St. Inez Creek was particularly difficult due to the soft, collapsing soil. Special techniques were used to maintain the bore hole stability way below the bed level of the creek.
Vehicular Movement Impact:
To prevent the bore hole from collapsing due to vibrations from nearby traffic, a road closure was necessary up to the STP bridge. This precaution was essential to protect the project and ensure its success.
The press release further states that the team has completed the remaining process, wherein bentonite slurry was used to stabilise the bore hole. Once stabilised, the 180-metre-long seamless HDPE pipe was pulled through from the Fire Department ground to the STP.
“We are proud of our team for overcoming these significant challenges,” said an official from IPSCDL’s technical section. Adding further, “The HDD method allowed us to install the pipe with minimal disruption and demonstrates our commitment to using advanced technology for the betterment of Panaji’s infrastructure.”
The successful completion of this project will improve the efficiency and reliability of Panaji’s sewage management system, contributing to the overall development and modernisation of the city.
