The Company has constructed about 40 km of hydro & highway tunnels in the difficult terrains of Himalayan geology.

Construction of RCC TUNNEL with Earth/Rubber Cushion after reclaiming the damaged NH-05 From KM 347/250 to 347/510 in the State of Himachal Pradesh

We are delighted to announce that Sai Eternal has been awarded the prestigious project for the construction of an RCC Tunnel with Earth/Rubber Cushion, marking a significant step towards rejuvenating the vital National Highway 05 in the breathtaking state of Himachal Pradesh. This monumental undertaking aims to reclaim and restore the damaged stretch from KM 347/250 to KM 347/510, promising improved infrastructure and connectivity.

The project site spans the picturesque landscapes of Himachal Pradesh where Sai Eternal Foundation would undertake the construction of Reinforced Concrete Cement (RCC) tunnel, fortified with an Earth/Rubber cushion. This strategic initiative is designed to enhance the resilience and durability of the highway ensuring a smoother and safer travel experience for all.

Dhalli Tunnel Project

The Dhalli Tunnel in Shimla, built in 1852 and approaching its 170th year, has been a source of traffic congestion due to its one-way movement. In response to this issue, a new double-lane traffic tunnel has been developed under the Smart City Mission. Running parallel to the old tunnel, this modern construction aims to alleviate traffic jams and provide relief to the commuting public.

The project titled was entrusted to M/s. Sai Eternal Foundation in collaboration with Sai Shakti Solutions LLP with construction commencing on March 11, 2022 and was efficiently completed with essential support treatment measures such as rock bolting, lattice girder installation, shotcreting with consolidation grouting, and forepolling, in a remarkably short timeframe. Notably, the project employed NATM Technology without Blasting.

The tunnel, shaped like a horseshoe, spans a total length of 159.75 meters with a width of 12 meters and a height of 8 meters. The construction of this tunnel employed a distinctive technique, featuring inner wall lining made with a combination of lattice girder synapses and steel fiber mesh. To prevent water leakage into the tunnel, geotextile and PVC membrane were installed on its surface. The tunnel’s surface was then meticulously paved and levelled using concrete. The primary concern during the construction of this tunnel was the potential seismic impact that blasting technology might have, posing a threat to nearby structures, including the existing one-way tunnel and surrounding buildings. To address this, a survey of approximately 40 buildings around and atop the tunnel was conducted before commencing the project. The survey revealed that some of these structures were in poor condition. Advanced equipment was utilized to monitor any movement or displacement in the vicinity of the tunnel. In response to public apprehension, the department opted for a technology-free approach, employing various machines for the tunnel excavation. This decision adhered to safety parameters, resulting in the successful completion of the tunnel ahead of schedule. Notably, this marks the first double-lane traffic tunnel constructed in Himachal Pradesh using this methdology, without causing any disturbance in the densely populated area. A key feature of the tunnel is that there was zero movement detected in any building, including the old tunnel, thanks to the careful selection of equipment and construction methods. No damage occurred to any structure during the construction process. The construction of this tunnel has been successfully concluded, showcasing a noteworthy achievement in terms of both safety and efficiency.

The Company has constructed about 40 km of hydro & highway tunnels in the difficult terrains of Himalayan geology.