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Case study details

Case study

7.5t crane 50M span for Defence, Dead Weight Restrictions, Head Room restrictions

A 7.5T 50M Span crane is required for defence to be installed in a Airplane Hangar for maintenance of the aircrafts. The building is already ready.

Project Challenges

  1. The building height has restrictions as it’s a hanger and is not sufficient  to hold a 7.5t crane of 50M span. The headroom available is too less.
  2. The building is designed for a very less dead weight of the crane. Only 43T dead weight of crane considered, instead of 70t.
  3. The way from our works at Faridabad to the site in Jammu is not suitable to transfer a 50M long girder in a single piece.

Questions

  1. How can a 7.5t 50M span crane be accommodated in the headroom available ?
  2. How can cranes be made of less dead load to meet the building strength requirements?
  3. How can we ship the 50M long girders from our factory to the site.

 

Solutions :

  1. Headroom : Reva opted for a special design known as fish belly design for this.
  2. 8 wheel configuration was used for the LT, so that the wheel loads could be distributed

Lower dead weight :

  1. We eliminated the platform, the requirement of a platform along the girder was eliminated. The crane girder flanges were made sufficiently wide that on this a person could easily walk through.
  2. The girder design was specially done. You can see the central area of the girder having more depth.
  3. The girder diaphragms were specially designed to have lower weights.
  4. We used German made energy chain instead of a festooning arrangement. The weight of these is much lesser than the conventional systems.

 

Transportation issue :

The girder was made in such a way that it could be split in 2 parts and rejoined at site.

Impact on Client

Results 👍
The approximate savings cannot be calculated as the hanger was already built with the incorrect design earlier, however a savings of around

50-60 Lakhs
In terms of building height reduction and building strength. Means the Crane purchased is almost free.
5632+

Happy clients

420+

Team Strength

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