New Delhi/Urban Transport News: On October 31, the Delhi Metro Rail Corporation (DMRC) opened the 17.8 km long Shiv Vihar - Trilokpuri Sanjay Lake section of the 59 km long Majlis Park-Shiv Vihar corridor (Line 7) of Phase 3, also known as the Pink Line. This stretch will be a major boon for the eastern and northern fringes of the national capital. Three interchange facilities at Welcome (With Red Line), Karkarduma and Anand Vihar ISBT (with Blue Line) will tremendously boost the connectivity of areas such as Shiv Vihar, Gokul Puri, Maujpur, Jaffrabad etc.
In the future, this stretch will get connected with the presently operational Majlis Park – Lajpat Nagar section of Pink Line. With the opening of this section, the Delhi Metro network now becomes 314 kilometers long with 229 Metro stations. After the inauguration of this section, Delhi Metro will have opened over 80 kilometers of new lines this year. All the major corridors under Delhi Metro’s Phase 3 are expected to be opened for passengers by the end of the year.
The main highlights of this section are as follows:
Interchange Facility on this Section This section has three interchange stations at Anand Vihar ISBT, Karkarduma and Welcome. The facility of interchange of Metro trains between line 7 (Pink Line) & line 3/4 (Blue Line) is available at Anand Vihar ISBT and Karkarduma Station and between line7 & line 1 (Red Line) at Welcome Station. The Maujpur Station is a four (4) track station having the provision of connection from Maujpur to Mukundpur, a corridor proposed in Phase-IV of the Delhi Metro project.
Special Spans The elevated section between I.P Extension and Maujpur consists of Special Spans including two Steel Spans over the existing DMRC Redline (Line 1) and Northern Railway track between Welcome & Shahdara. Cantilever Construction (CLC) Spans of lengths 255 meters over Anand Vihar Railway Yard and Mainline tracks were constructed over running track with 25 KVA OHE System.
Sharp Curves Due to uneven twist and turns in this alignment, Delhi Metro had to construct as many as 10 curves on this stretch that passes through very congested areas like I.P. Extension, Anand Vihar, Welcome, Seelampur, Jaffrabad, and Maujpur. Curves of less than 300 meters of the radius are considered “Sharp Curves” in Urban Rail Construction. The work of building sharp curves requires a lot of engineering skills and several factors have to be kept in mind while designing special segments/spans at the concerned turn/juncture.
DMRC had to form especially dedicated beds in its casting yard for the casting of special segments. The segments were constructed according to the already defined ”radius of curvature” and then put on the viaduct. Cantilever piers and portals were constructed at appropriate places to provide a smooth transition for the curves wherever required to take care of the shifted alignment due to curvature. Earlier DMRC had constructed sharpest broad gauge curve on its elevated section in Gurgaon near IFFCO Chowk with a radius of 282.05 meters in Phase II and 242 meters curve on standard gauge between Okhla and Jamia in Phase 3.
Crossing the Railway Station at Anand Vihar Site Another major engineering challenge was encountered when the viaduct had to cross the Anand Vihar Railway Station of the Indian Railways, one of the busiest stations in terms of ridership and number of trains. In fact, two piers had to be erected on the Anand Vihar Railway platform itself and large spans (around 70 meters) had to be erected to avoid any kind of disturbance to the Railway station. DMRC engineers had to ensure that the train schedule of the Indian Railways was not disturbed during the DMRC’s construction.
Despite this difficult challenge, DMRC successfully completed this stretch in a planned manner, without affecting the routine working of the Indian Railways. For crossing this area of Indian Railways, six piers were erected in the railway compound in such a way that there was no infringement of the Metro line with the railways. Provision of future development plans of the Railways was also kept in mind so that the Metro piers would pose no problem to any such plans in the future. Two piers were placed on the running platforms where it was difficult to work with round-the-clock train and passenger movement.
Due to the peculiar placement of piers in the railways land, the spans are quite large. One of the spans which are designed between pier no. 235 and 236 are almost 70 meters long. In order to cater to the requirement of special spans, cellular lightweight concrete (CLC) construction has been done with the help of bridge builders. This construction methodology has helped in continuous construction without interfering in the movement of trains to and from the Anand Vihar Rail terminal. These piers are located at the periphery of the Anand Vihar Railway station. Two of the piers are located on the platforms of the Anand Vihar Railway station of Indian Railways.
DMRC has crossed the railway lines in a very safe and systematic manner with all safety precautions in place and without affecting the daily train movement on the section in coordination with the Indian Railways. The work was done only after obtaining the necessary approval from the Commissioner for Metro Rail Safety (CMRS). DMRC’s Rare Feat at Karkarduma Metro Station The Delhi Metro has achieved a rare feat in Metro construction by crossing over its existing operational line at the Kakarduma Metro Station at a record height of 21 meters above the ground. Construction for crossing over of Metro viaduct at the existing Karkarduma Metro station was never an easy task for the Metro engineers. It posed numerous challenges to the civil engineers throughout the project, as this is one of the highest crossings of the Metro project.
The Majlis Park-Shiv Vihar Corridor is crossing the existing Vaishali- Dwarka elevated line (Line-4) 21 meters above the ground and is 10 meters above the existing Metro line. The work was done without disrupting the normal daily Metro train/passenger services for even a single day. This new alignment of Line-7 is crossing the existing Vaishali – Dwarka Metro alignment at Karkarduma just before the existing Karkarduma station at an angle of 114 degrees. DMRC had to carry out segmental erection for putting a special span of 37 meters between pier no. 254 and pier no. 255. Delhi Metro has crossed the existing Metro line at such a height in a very safe and systematic manner with all safety precautions in place.
The launching of the girder and erection of the span was carried out with extra precaution. An extensive round the clock CCTV monitoring was done adjacent to the rail track to avoid any sign of electrocution and fall of material during the crossing. The monitoring consisted of earthing provided to the launching girder, pre-stressing beam, erected segments or any other loose item kept on the span. The work was carried out during the shadow block of the existing system during non-operating hours after getting all the clearances from the competent authorities.
It was in all likelihood that the engineering challenges would have compelled the engineers to compulsorily to disrupt the passenger/Metro train services on some crucial days. Given the fact that the Dwarka-Noida/Vaishali (Line 3/4) corridor of the Delhi Metro Network is the busiest corridor in terms of ridership, a small disruption in the services would have created a lot of passenger unrest. Thus, the engineers planned the execution of this technical feat so meticulously that everything was completed silently and successfully without disrupting the existing passenger traffic on Line-4.
Vinod Nagar depot, the new hub of Phase 3 Trains The Vinod Nagar Metro depot will primarily cater to the services on the Pink line (Majlis Park-Shiv Vihar). The Depot at Vinod Nagar is located near National Highway 24 and is one of two depots of Pink line of Phase 3. Due to the scarcity of land, the Depot functions are divided into two pieces of land on either side of the Ghazipur Nala i.e. Site- 1 & 2. The area of the depot is approx. 18.2 hectares. It has a number of hi-tech features to ensure round the clock maintenance of the trains. The following are the main highlights of this depot:
(Source: Press Release)