Hall of nations

Presentation : hall of nations

1. HALL OF NATIONS AND NEHRU PAVILION (1972 ) URVASHI VIHOL

2. INTRODUCTION On August 15, 1947, India became an independent state, free from Britain’s colonial rule. In 1972, to mark the 25th anniversary of this momentous occasion, Prime Minister Indira Gandhi unveiled the Hall of Nations, designed by Indian architect Raj Rewal .  It was the world’s first and largest-span space-frame structure .  The Permanent Exhibition Complex is designed to form the focus of 130 acres of Exhibition ground designed by Raj Rewal in New Delhi.  It was constructed in 22 months . It had a clear span of 78 metres and height 30 meters. Engineer : - Er . Mahendra raj

3. SITE ANALYSIS Dimenssions : 316 m X 251.2 m Road geometry Type of soil North – 25 M road silt loam soil South – 25 M road East – 25 M road Annual wind speed- 8 km/ hr West – 25 M road wind direction – south-west south-east .

4. Site Accessibility Total Gates – 3 Nos Service Entry , Public Entry , Vip Entry SITE ANALYSISSITE Area and Ratios Site area : 316 m x 251.2 m 19.61 acre. Built up area : 9.41% of area 1.7 acre . Green space : 24.3% of site area. P edestrian pavement surface area : 0.66% of area. parking area : 30% of area Parking Staff parking : 65 cars , 71 bikes Vip parking : 76 cars , Visitor’s parking : 149 cars , 254 bikes Service parking : 4 Truck Helipad : capacity - 1 40 m dia .

5. THE DESIGN : Raj Rewal leaned on geometry and proposed four halls linked by ramps . The hall of nations is a structure based on tetrahedrons , triangulated forms and hexagons, which is seen in jails' in India . He used space frames as both, roof and wall combined to diffuse the harsh sunlight in Delhi. Hence the structure itself becomes a sun-breaker .  hall of industries is a combination of 4 smaller pavilions by ramps enclosing a The central area for open air exhibits, utilities, toilets, and other services are located underthe ramps . Although each of the halls was initially conceived as a full pyramid the truncated form was adopted in order to avoid unnecessary constructions.  

6. Each of the four Halls ofIndustries is similar in design and is 44m x 44 m x 16m high. Free standing coffered mezzanine floors cantilevering out of cylindrical shafts provideadditional exhibition area in each hall .   A special 9 member joint was evolved for The Hall of Industries rest on spread precast construction but the builder footings tied together with high tensile preferred in-situ construction. The joint steel bars. The entire complex was was modified to suit the adopted analysed , designed and built in a period of technique . The Halls of Nations is fifteen months. supported on pile foundations tiedtogether with post tensioned plinth

7. THE DESIGN : Investigating 2 alternative systems Lamellas – The smaller hall (Hall of industries) was possible with a system of intersecting ribs , the bigger hall required intersecting heavy trusses . S pace frame – it had the flexibility that with a different cross section and different member length the same system could be used for the biggest as well as the smaller halls . The enclosure as well as the roof of both types of halls could be created with the same system . Selection of construction material : Materials of construction considered were tabular steel pipes , structural steel members and concrete. On the basis of an approximate analysis the cost of construction with steel pipes , structrual steel members and reinforced concrete was evalu ated. This evalution indicated that the alternative with reinforcement concrete was the most economical with structural steel about 30% more expensive than concrete and with steel pipes even more. It was decided to use R.C.C. as material .

8. Exterior wall details Space frame details : Exterior - wall details : The bottom 2 rows of each floor are cladded with concrete plates at the height 2m. And remaining rows above the opaque frames are not cladded so as to give window appearance . Interior – wall details The other face of the space frames, the bottom 2 rows of each floor are cladded with concrete plates at the height 2m. And the remaining rows above the opaque frames are diagonally seperated and different types of cladding. Interior wall details

9. Working drawings

10. Working drawings

11. https://archipedia.online/topic-to-give-tribute-to-the-the-hall-of-nations-delhi /# https:// architexturez.net/doc/az-cf-182294 https:// www.slideshare.net/MayurWaghulde3/hall-of-nations-pragati-maidan-delhi https://www.slideshare.net/aanchalmehta93/hall-of-industries Sources

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