The Delhi Metro Rail Company(DMRC) on Tuesday accomplished a key milestone in its Section-IV work by erecting the project’s very first-at any time U-girder on the Janakpuri West-R K Ashram Marg corridor, officers said.
The U-girder was erected in the vicinity of theKali Mata Temple, between the approaching Pushpanjali and Deepali Chowk metro stations along the Outer Ring Road and is an critical ingredient of the elevated viaducts produced for metro corridors.
U-girders are precast pre-tensioned, U-formed girders on which keep track of laying can be done quickly.
“This is a common span with twin U-girders of 28 m duration each individual in a single span and the total pounds of just one U-girder is roughly 160 MT. This is a big milestone for DMRC, as in spite of numerous constraints due to the ongoing pandemic, this important element of the development perform could be started off,” the Delhi Metro stated in a assertion.
The casting of the U-girders was started off at the specified casting lawn in Mundka in June earlier this calendar year, it stated.
Metro projects across the world are thoroughly using U-girders, which will save time in construction aside from ensuring far better high quality. Just after casting, these girders are brought to the site and introduced with the enable of superior capacity cranes or launchers. A complete of 780 such U-girders are planned to be erected in this agreement, the DMRC explained.
The casting do the job of these U-girders also necessitates meticulous precision and planning. Complete treatment has to be taken concerning the routine maintenance of all measurements and specialized parameters in the course of the casting course of action.
The 28.92 km extensive Janakpuri West – R K Ashram Marg corridor is an extension of Magenta Line and will arrive up with 22 stations. Building perform on this certain area had commenced in December past 12 months.
Previously, the reducing perform of the 1st at any time Tunnel Boring Equipment (TBM) of Delhi Metro’s Period 4 work has been started off at Vikaspuri on the Janakpuri West – RK Ashram Marg corridor. As element of this tunnelling push, two tunnels (for up and down movement) of a size of 1.4 kilometres will be bored between Vikaspuri and Krishna Park Extension.
The tunnelling do the job with the TBM is expected to commence upcoming month, after the lowering and assembling of the large 73 metre prolonged device is accomplished. These tunnels will be positioned amongst the Janakpuri West and Krishna Park Extension stations of the corridor. The tunnelling will start out from Vikaspuri place in continuation of the Magenta line tunnel that has been already created for the presently operational Botanical Backyard – Janakpuri West corridor.
The tunnel will be built around at a depth of 14 to 16 metres. About 2,040 concrete rings will be set up in these tunnels. Each tunnel will have an interior diameter of 5.8 metres. The full tunnelling work on this stretch is expected to be accomplished in about 15 month’s time. The alignment of the tunnel will be together the Outer Ring Highway.
As part of the Section 4 operate permitted so significantly, about 27 kilometres of underground lines will be made. The Janakpuri West – RK Ashram Marg corridor will have underground sections of 7.74 kilometres in whole.
A TBM, is a device used to excavate tunnels with a round cross segment by way of a wide variety of soil and rock strata. They can be intended to bore by means of nearly anything from hard rock to sand. TBMs have revolutionised the way tunnelling do the job is done all around the planet as now tunnels can be bored without disturbing the buildings and other structures on the area.
TBMs are in particular valuable for underground tunnelling operate in congested urban places. DMRC has been using TBMs for its tunnelling do the job given that Phase 1. In Period 3, when about 50 kilometres of underground sections ended up created, about 30 TBMs had been pressed into services in the countrywide cash.