New Majerhat bridge will be 2m higher to abide by railway rule
Ajanta Chakraborty | TNN | Jan 14, 2019, 06:16 IST
The new Majerhat bridge will be more than half-akilometre-long and 21.2m wideKOLKATA: The new Majerhat bridge will be more than half-akilometre-long and 21.2m wide, according to the general arrangement drawing (GAD) submitted to PWD by construction company SP Singla. The height proposed is 7.5m, about 2m higher than the one that collapsed on September 4.
The Haryana-based SP Singla has been contracted to build the structure, which is actually a rail overbridge (ROB), as per the agreement clinched on November 6, 2018. However, the design took a lot of time to be finalized because the measurements would infringe on the Joka-Esplanade line at Majerhat.
After deliberations, PWD, which is implementing the project, zeroed in on a cablestayed bridge (like Vidyasagar Setu) that would need smaller space and maintain the original gap with the Metro project. The GAD is the basis of the final design with which the ROB will be constructed after clearance from the railways. Rail Vikas Nigam Limited (RVNL) that is building the Metro line gave its nod in the last week of December.
“The GAD gives an overall view of the bridge as it will appear once constructed. It includes a plan, an elevation, a typical cross-section, a site plan, a suitable skew diagram and vertical alignment diagram,” a state official explained. After the GAD is cleared, the detailed design will be drafted, and again sent for the railways’ approval.
The four-lane Majerhat bridge will be approximately 565m long. It will start at the Burdwan Road-DH Road crossing on the north and end on NR Avenue in the south. Compared to the old one, the width will be 4m more. The bridge’s central line will be shifted to the eastern side because the Metro alignment on the west is sacrosanct. Therefore, roads on the eastern side will be narrowed.
Pylon to pylon, the main span will be 100m-long. Since it’s a cable-stayed bridge, cables from the pylons or towers will support the deck. Like Vidyasagar Setu, Majerhat bridge will have four pylons — two to the north and two to the south. The city’s other cable-stayed bridge Nivedita Setu has one pylon each on the two sides.
Towards the south, the new bridge will have smaller spans (47.5m, 13.5m, 10.5m, 20m, 23m, 20m and 53.65m), which round off to 140m. In the north, there are nine spans of 20m each, and a bigger span of 84.17m., rounding off to 324m.
The height of the new bridge — from the rail tracks to the finished road level will be 7.5m, 2m more than the old one. “The height of the new bridge was increased to accommodate the latest vertical clearance norms of the railways,” said an official, admitting that it will be an uphill task maintaining the recommended gradient of 1:25 and ending the slopes on Burdwan Road in the north and NR Avenue in the south.
Finally, the carriageways will be 8m each, split into two lanes. There will also be a 1.5m pavement in the west. The pavement on the eastern side was scrapped to maintain the Metro alignment.
The Haryana-based SP Singla has been contracted to build the structure, which is actually a rail overbridge (ROB), as per the agreement clinched on November 6, 2018. However, the design took a lot of time to be finalized because the measurements would infringe on the Joka-Esplanade line at Majerhat.
After deliberations, PWD, which is implementing the project, zeroed in on a cablestayed bridge (like Vidyasagar Setu) that would need smaller space and maintain the original gap with the Metro project. The GAD is the basis of the final design with which the ROB will be constructed after clearance from the railways. Rail Vikas Nigam Limited (RVNL) that is building the Metro line gave its nod in the last week of December.
“The GAD gives an overall view of the bridge as it will appear once constructed. It includes a plan, an elevation, a typical cross-section, a site plan, a suitable skew diagram and vertical alignment diagram,” a state official explained. After the GAD is cleared, the detailed design will be drafted, and again sent for the railways’ approval.
The four-lane Majerhat bridge will be approximately 565m long. It will start at the Burdwan Road-DH Road crossing on the north and end on NR Avenue in the south. Compared to the old one, the width will be 4m more. The bridge’s central line will be shifted to the eastern side because the Metro alignment on the west is sacrosanct. Therefore, roads on the eastern side will be narrowed.
Pylon to pylon, the main span will be 100m-long. Since it’s a cable-stayed bridge, cables from the pylons or towers will support the deck. Like Vidyasagar Setu, Majerhat bridge will have four pylons — two to the north and two to the south. The city’s other cable-stayed bridge Nivedita Setu has one pylon each on the two sides.
Towards the south, the new bridge will have smaller spans (47.5m, 13.5m, 10.5m, 20m, 23m, 20m and 53.65m), which round off to 140m. In the north, there are nine spans of 20m each, and a bigger span of 84.17m., rounding off to 324m.
The height of the new bridge — from the rail tracks to the finished road level will be 7.5m, 2m more than the old one. “The height of the new bridge was increased to accommodate the latest vertical clearance norms of the railways,” said an official, admitting that it will be an uphill task maintaining the recommended gradient of 1:25 and ending the slopes on Burdwan Road in the north and NR Avenue in the south.
Finally, the carriageways will be 8m each, split into two lanes. There will also be a 1.5m pavement in the west. The pavement on the eastern side was scrapped to maintain the Metro alignment.
FROM AROUND THE WEB
more from times of india Cities
LATEST VIDEOS
All Comments ()+^ Back to Top
Refrain from posting comments that are obscene, defamatory or inflammatory, and do not indulge in personal attacks, name calling or inciting hatred against any community. Help us delete comments that do not follow these guidelines by marking them offensive. Let's work together to keep the conversation civil.
HIDE