DESIGN AND EXECUTION OF ZINJ TRUNK SEWER PROJECT (ZTS) IN BAHRAIN

Area of activity
WATER

Service
Computational fluid dynamics (CFD)

Client
Main client: Haji Hassan Group. Final client: Kingdom of Bahrein. Ministry of Works, Municipalities Affairs and Urban Planning

Scope

• Hydraulic Engineering (Design of the Baffle Drop Shafts)
• Structure Engineering (Detailed Design of the Baffle Drop Shafts, regular Shafts and Pile Walls)
• Geotechnical Engineering (Design check of the micro-tunnelling works)

Duration
2023-2024

The Ministry of Works, Municipalities Affairs, and Urban Planning of the Kingdom of Bahrain, through the Sanitary Engineering Projects and Planning Directorate, is undertaking a significant infrastructure project to construct trunk sewers using micro-tunneling technology. This initiative aims to decommission major pumping stations by creating deep gravity sewers that will connect to the Bahrain Tubli Wastewater Treatment Plant (WPCC). Dair & Silga Group has partnered with the Haji Hassan Group to provide technical expertise in various civil engineering disciplines, including hydraulic, structural, and geotechnical engineering, to ensure the project’s success.

Dair & Silga Group has enhanced the design of the baffle drop shafts, which are essential for managing large flows and directing them from surface networks to deep networks. Using Computational Fluid Dynamics (CFD) models, they have ensured a controlled flow descent of approximately 15 meters, minimizing turbulence and enhancing infrastructure durability.

The team has refined the structural design of both regular shafts and baffle drop shafts, incorporating detailed structural calculations and design drawings. Additionally, they reviewed the design of secant pile walls to account for the impacts of micro-tunneling work.

The deep gravity sewer construction involves several kilometers of 3-meter diameter Glass Reinforced Plastic (GRP) pipelines installed via micro-tunneling. Dair & Silga Group conducted thorough evaluations of the micro-tunneling works, assessed soil suitability, and ensured the adequacy of the GRP pipelines. These pipelines were rigorously tested for resistance to the jacking forces encountered during the micro-tunneling process.

Through their comprehensive expertise in hydraulic, structural, and geotechnical engineering, Dair & Silga Group has played a crucial role in advancing and successfully implementing this vital infrastructure project in Bahrain.