Basoli, situated on the right bank of River Ravi at an altitude of 1876 ft. Is in the northern most state of Jammu-Kashmir, India. It is situated close to the Himachal-Pradesh border on the road Dunera-Durban-Basoli-Bani-Bhadarwah.The connectivity options available from Punjab and Basoli were mainly road via Basoli - Lakhanpur – Kathua through which River Ravi passes and a manual ropeway near Basoli. But with the commissioning of Ranjeet Sagar Dam which is located about 14 km downstream of Basoli, both the road link from Basoli to Kathua and the ropeway link to Punjab got submerged. The alternative alignment from Basoli to Mahanpur having a length of 32 km has been constructed, but this has resulted in increasing the distance from Basoli to Lakhanpur from 47 km to 82 km and Pathankot from 46 km to 88 km.
The upcoming bridge will accommodate two lanes of traffic as well as two lanes of sidewalk over the River Ravi. The bridge will have a main span of 350m, side span of 121m, and a total length of 592m. It overlooks a deep valley with a channel width of 250 m, which at high flow further widens to nearly 300 m.
Faster construction cycle
The site plan also includes constructing a 106 m high pylon. The span layout is symmetric (121-350-121 m), with pylons positioned at the top of the river banks, out of each from the water below. In order to keep the pylons fairly lightweight and also to accommodate any special detailing requirements, the section is a hollow box shape above deck level with a wall thickness of 0.5 m, and below deck the legs are solid.
Pylon has a modified diamond configuration extending upto a height of 52.7 m and then a straight vertical portion of 53.3 m height making a total height of 106 m. Climbing formwork MF 240 has been provided for each leg of the lower diamond shape base of the pylon, which will move on to the second pylon once the first pylon is cast up to the cross beam bottom.
Afterwards, for upper part of diamond shape of the pylon, Automatic Climbing formwork Xclimb 60 has been provided for each leg of the pylon and the same set will move on to the second pylon, once the first pylon is cast up to the transition area. For the straight portion, same set of XClimb 60 with necessary modification will be used to cast the 53.3 m long vertical portion. This has ensured safety of the site crew, smooth and efficiency of operation at the site despite the erratic weather conditions.
Complexity, delivered through simplicity
Drawing on past experiences, Doka has supplied the Basoli project with a customised solution, certain to meet all the requirements. Each project has its own set of challenges and specific requirements. The Basoli cable-stayed bridge had to overcome its own set of numerous constraints. Singhla construction had factored in all these parameters, which Doka was able to incorporate during the execution phase.
Identical to any project, Doka had resorted to an approach that was simple, flexible, technically sound, and viable. Both the crane-guided and the automatic climbing formworks, viz. MF 240 and XClimb 60 respectively, are driven by efficient and simpler mechanism. These systems could be fitted, modified and reset with minimal human intervention and, thus, error. Quick repositioning and modification of XClimb 60 could be carried out even in high winds, a testament of its scalability and safety. Also, both the formwork variants are adaptable to the structure, regardless of the actual dimension of that structure, in this case a diamond-shaped pylon.
Another asset Doka was able to bring to the table is the modularity of its entire system. This characteristic allows any construction venture to adopt Doka’s offering tailor-made to their requirements. This has been a feature in Basoli project, too. All of Doka’s distinct formwork technologies were able to work as a single cohesive unit, while maintaining the standard and safeguards expected from an esteemed solution provider.
In a Nutshell
Doka’s comprehensive package of modular, highly-efficient, cost-effective and safe system was the hallmark in its past endeavours, and has been evident in the Basoli project as well. For all the complexities involved in the project, Doka rendered a simple yet effective solution.