Gurgaon: One-way Firkyover Delhi-Jaipur near Iffco Chowk must be closed for traffic after one end of the concrete structure that supports it collapsing on Monday.
The underground gutter line, which is more than 20 years old and remains scheduled for repairs, running under the flyover explosion because the gas caught in it and increases the flow of water from the rain recently.
When the pipe explodes, the ground gives way and exposes the gutter line.
The flyover retention wall, which holds one end of the structure and a height of about 7 meters, has collapsed under the impact.
The police put a barricade at the beginning of the flyover to prevent the vehicle from there.
The Flyover is only for traffic coming out of Delhi and heading to Jaipur.
Officials at the National Highway Authority (NHAI) and GMDA said they would take several days to improve the portions that collapsed.
Until then, the flyover will be closed for Delhi-Jaipur traffic and vehicles on the route will be transferred to the main part of the toll road that runs in parallel with it.
GMDA officials said they should improve the gutter line from near the Sirhaul border to Rajiv Chowk immediately.
The decision was taken at a meeting with the chairman of the Minister in April.
But now that the lines have exploded, the GMDA will fix this portion first before the remaining stretch is taken.
Pradeep Kumar, Chief Engineer at GMDA, agreed that the gutter line was in the urgent need for improvement.
He explained that the lines were made of an RRC pipe, which was almost no longer used.
“For years, many gases formed in closed gutter lines.
These gases are light and they hit the crown (top) of pipes, which caused them to worry slowly.
The pipe in the place weakened, and high water pressure from heavy rain only worsen the situation.
When the underground pipe explodes, the ground above gives up.
The retaining wall, which holds one of the endings, faints too, “he added.
When the 900m flyover is being built in 2019, there are plans to shift the gutter line.
But it cannot be done because of space constraints and other technical difficulties.
“The only solution we now have is a healed pipe technology (CIPP).
This is one of the advanced trenchless rehabilitation methods used to repair the existing pipelines.
This is a smooth layer of pipe in the existing one,” Kumar said.
According to Kumar, after this pipe was repaired with CIPP technology, their long life would increase by 70-80 years.
“The explosive part will be corrected soon.
The remaining stretch of the Sirhaul border to Rajiv Chowk will be corrected in the end,” he said.
After the pipe is restored, the NHAI contractor will repair the retaining wall.