monolithic

Slide 1

MONOlITHIC DoMES

IntroductionA monolithic dome is a structure cast in a one-piece form. The form may be permanent or temporary and may or may not remain part of the finished structure.Forms have been made using nearly every common structural material including air pressure supported fabric.Engineering Details1. Foundation The Monolithic Dome starts as a concrete ring foundation, reinforced with steel rebar. Vertical steel bars embedded in the ring later attached to the steel reinforcing of the dome itself. Small domes may use an integrated floor/ring foundation. Otherwise, the floor is poured after completion of the dome..2. Airform An Airform fabricated to the proper shape and size is placed on the ring base. Using blower fans, it is inflated and the Airform creates the shape of the structure to be completed. The fans run throughout construction of the dome.FOUNDATION Concrete RingBaseAirform to providerequired shape to themonolithic dome.Case Study:GLOBAL VIPASSANA PAGODA, Mumbai,Maharashtra, India3. Polyurethane Foam Polyurethane foam is applied to the interior surface of the Airform. Entranceinto the air-structure is made through a double door airlock which keeps the air-pressure inside at aconstant level. Approximately three inches of foam is applied. The foam is also the base for attachingthe steel reinforcing rebar.Materials:Prefabricated reinforced concrete dome Brick and glass filling ring wall

Loadings: Vertical load transfer system: The tension hoop of the dome is replaced with a series of 36 Y-shaped buttresses that follow the line of thrust. The dome itself is a thin reinforced concrete shell structure, its exposed underside illustrates an amazing geometry of concrete ribbing which provide a visual expression of the lines of force. The roof is an excellent example of transferring loads using membrane action.

Lateralll load transfer system: The inherent shape of the dome and the buttresses are capable of resisting horizontal forces.Materials and LoadingsCutaway Schematic cutaway of the layers of the final Monolithic Dome. SIGNATURE

AIRFORM

Application of polyurethane Foam on the interior after the air pressure is maintained inside.POLYURETHANE FOAM4. Steel rebar Steel reinforcing rebar is attached to the foam using a specially engineered layout ofhoop (horizontal) and vertical steel rebar. Small domes need small diameter bars with wide spacing.Large domes require larger bars with closer spacing.

Installation of reinforcements after spraying polyurethane foamREINFORCEMENTS REBAR5. Shotcrete Shotcrete a special spray mix of concrete is applied to the interior surface of thedome. The steel rebar is embedded in the concrete and when about three inches of shotcrete isapplied, the Monolithic Dome is finished. The blower fans are shut off after the concrete is set.

SPRAYING OF SHOTCRETEAFTER LAYING DOWN OF STEEL BARS

The Global Vipassana Pagoda is a notable monument in Mumbai, India which serves for peace and harmony. The monument was inaugurated by Pratibha Patil, President of India on 8th February 2009. It is located in the North of Mumbai on a peninsula between Gorai Creek and the Arabian Sea. The Global Vipassana Pagoda was built out of gratitude to the Buddha, his teaching and the community of monks practicing his teaching.

SectionStone dressing for first DomeStone blocks were dressed to have an interlocking shape, in order to grip one with another

Section of DomesSubmitted by :-Vishnu Teja Reddy - 101110024Nishay Lawrance - 101110037Gurvinder Singh - 091110048