Feasibility Study, Design & Supervision of RCC Bridge at Ranolia Nullah – Lower Kohistan
Project Details
- Client: Communication & Works (C&W), District Lower Kohistan
- Project Start Date: July 2, 2021
- Project Completion Date: September 30, 2021
- Total Project Cost: 600 million PKR
- Bid Amount: 3.747 million PKR
- Scope of Work: Feasibility Study, Structural Design, Drainage, Quality Control, Construction Supervision (F, S, D, Q, C)
- Contractor Type: Single Firm
- Bridge Specifications:
- Type: Reinforced Cement Concrete (RCC) Bridge
- Location: Ranolia River, Dubair, Lower Kohistan
- Total Length: Estimated based on 3 spans
- Number of Spans: 3
- Function: All-weather connectivity for vehicles and pedestrians
Project Overview
The RCC Bridge at Ranolia Nullah in Lower Kohistan was designed and supervised to enhance transportation connectivity, ensure safe river crossings, and support economic activities in the region.
This three-span RCC bridge was constructed over the Ranolia River in Dubair, a strategic location prone to seasonal flooding and difficult terrain. The bridge was designed to withstand heavy traffic loads, strong river currents, and harsh environmental conditions.
The project involved a comprehensive feasibility study, structural design approval, and construction supervision, ensuring that the bridge met engineering and safety standards while serving the local population effectively.
Key Challenges in Construction Supervision
1. Hydrological and Environmental Constraints
- Unpredictable water levels in the Ranolia River posed a challenge for foundation construction.
- The bridge had to be engineered for flood resistance, with reinforced piers to withstand strong water currents.
2. Structural and Engineering Challenges
- The three-span design required precision engineering to balance the load distribution across piers.
- Reinforcement detailing had to be optimized for seismic resistance, as Kohistan lies in a seismically active zone.
3. Difficult Terrain and Accessibility Issues
- Lower Kohistan is a remote and mountainous region, making transportation of construction materials and machinery difficult.
- The steep and unstable slopes along the riverbanks required extra slope stabilization measures.
4. Logistical and Material Supply Delays
- Sourcing high-quality concrete, steel reinforcements, and aggregates in a remote area led to occasional supply chain disruptions.
- Transporting heavy machinery for piling and deck slab installation was a challenge due to narrow, rugged access roads.
5. Safety and Regulatory Compliance
- Ensuring worker safety was a critical aspect, especially for construction near a river with strong currents.
- The project had to comply with Pakistan’s national highway and bridge design codes, requiring continuous quality control and testing.
Project Outcomes and Benefits
1. Improved Transportation and Connectivity
- The bridge provides a year-round safe crossing for residents, reducing dependence on seasonal ferries or unsafe crossings.
2. Economic Growth and Trade Facilitation
- Enhanced road connectivity benefits local businesses, agriculture, and trade, helping economic development in Lower Kohistan.
3. Increased Safety and Structural Durability
- The RCC structure ensures a strong and long-lasting bridge, minimizing risks associated with flooding and erosion.
4. Support for Regional Development
- The bridge plays a crucial role in improving mobility in the region, boosting tourism and local accessibility.
5. Resilience Against Natural Disasters
- Designed with high flood resistance and seismic stability, the bridge ensures long-term reliability in extreme conditions.
Conclusion
The F/S Design & Supervision of RCC Bridge at Ranolia Nullah in Lower Kohistan was successfully executed despite logistical, environmental, and engineering challenges. The bridge now serves as a critical infrastructure asset, supporting safe and efficient movement of people and goods. With advanced structural engineering and rigorous supervision, this project contributes significantly to regional development and connectivity.
