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
