Delhi Metro Introduces Girder Launcher With Transporter: How It Will Help

Delhi Metro authorities started the launching work on the Janakpuri West – RK Ashram Marg hall, which is presently beneath building, and launched a specifically designed launcher hooked up with a transporter for the launch of U-girders on the elevated part. The Delhi Metro Rail Corporation (DMRC) states this as an ”innovation in its building know-how” used for the primary time within the nation, and is more likely to expedite the tempo of building work on the upcoming corridors of Delhi Metro Phase IV.  (Also Read: Tunneling Drive For Delhi Metro’s Janakpuri West-R Ok Ashram Marg Corridor Started )
 

Why was the usage of U-girders difficult for Delhi Metro?

• The set up of U-girders was performed with the assistance of two cranes having a capability 350/400T which have been positioned at every pier location, within the earlier phases of building.
• The U-girders have been transported at every pier location with the help of an extended trailer with an approximate size of 42 metres. This course of was difficult for the metro authorities within the congested city areas of the nationwide capital.
• This is as a result of the positioning of the heavy capability cranes occupy lots of house. Moreover,  transporting the U-girders of 28 metres in size with lengthy trailers was additionally tough because the roads within the nationwide capital area often witness heavy visitors volumes. 
• These limitations would inhibit the usage of U-girders in building actions for Delhi Metro, although U-girders are probably the most appropriate buildings for viaducts by way of value and time.
   

How is the brand new know-how of ‘Launcher with Transporter’ – useful for building?

• The new launcher with transporter is totally electrical with a better output, in contrast to the traditional launchers or cranes. The transporter carries the U-girder from one designated level and strikes on the rails laid over the erected U-girders, to add extra girders from the feeding level to the launcher.
• As a results of this course of, the U-girders are to be transported on the trailer solely as much as the feeding level recognized at an appropriate location and never for all the size of the monitor. This ends in a a lot much less consumption of house. 
• The new launcher is 62 metre lengthy having a complete weight of 230T, based on Delhi Metro. It can negotiate gradients as much as 4 per cent and 200 metre radius curves. Whereas, the transporter which transports the girder is 41.75 metre lengthy having a complete weight of 35T, which may journey with a pace of three km per hour at no load and at two km per hour at full load. 
• The output of the brand new know-how is increased as in comparison with the traditional technique of the launching of U-girders. On common, four-to-six U-girders per day may be erected with the brand new launcher, whereas, with the traditional technique, round two U-girders might be performed in congested areas of Delhi or different areas within the nationwide capital area.
• Moreover, the erection work of U-girders with the traditional cranes may solely be performed throughout evening hours because it requires the blocking of roads to place the cranes. Whereas, with the brand new launcher, the girders are transported with the transporter over the erected viaduct with none interface with the highway from a single recognized feeding level.

The launcher was made operational on Monday, July 5, for the development of a 9.5 kilometre lengthy viaduct from Mukarba Chowk to Ashok Vihar protecting 4 metro stations – Majlis Park, Bhalswa, Azadpur, and Ashok Vihar, and a connection to the depot from Majlis Park.