Study Program
Period
: S0673 / Building Construction II
: 2007
FOUNDATION
Meeting 2
FOUNDATION
Foundation is the part of functioning building support entire
weight of building and going on it to the ground under.
Kinds of and foundation construction type depended
building type above him.
Besides depended building type, condition of ground where
building founded, also become factor determining used
construction type. Greater the burden, also greater the
energy support needed to ground.
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Condition of ground marginally can be grouped in to 2 type:
1. Ground type have the character of “ STABLELY”
2. Ground type have the character of “ LABILELY” or
unstable
Ground have to stabilize, if the ground do not experience
of the change in dry season and also rain season. such
here is movement to the top, downwards and aside even
if.
Ground had to unstable or labile, if very monstrous its
change between rain season and summer.
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When met by labile ground, its better to repair of its ground
before executed. The example for shallow foundation,
ground repaired by wearing bamboo pile or wood then
added by sand coat so that more stable.
Stability an foundation is also influenced by is thick of hard
geology of it and also the condition of its coat represent
flat or heel.
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Shallow Foundation
Which the including shallow foundation type for example :
• Local foundation
• Band foundation / continuing.
Upon which for shallow foundation, is usually weared by
materials from :
• Stone couple.
• Reinforced concrete or is spineless.
• Wood of Dolken or iron wood.
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Local Foundation
Special condition if used by this foundation type is :
a. Building above it have to be strong and sturdy to wind.
b. Foundation have to come into minimum ground 1/3
height.
c. Above foundation have to give by sloof of wood or
concrete closed.
d. Between foundation and sloof have to each other
related so that become one strong unity.
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Representative of local foundation :
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Foundation Band.
Is referred as band foundation because this foundation
continue and direct under wall, whether there is door or
not. This foundation type now still or used inveterate
especially for the high rise building and simple housing.
Band foundation can be made by using red brick, stone
multiply and reinforced concrete.
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Band foundation of red brick couple :
This foundation seldom be used except for simple
building and wide usually undercarriage foundation of it
made in such rule so that width 2-3 thick times its wall.
Stone foundation :
This foundation of energy support it will be more be
compared to big of brick foundation. Is upon which used
by stone multiply and glued informed against sand and
cement with comparison of max 1pc : 5pc. At its
underside is given minimum sand 10 cm. To unfavorable
ground, under foundation couple and above sand given
by empty stone couple or without glue, but its gap filled
by sand and compacted.
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Foundation Continue.
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Well Foundation
Well foundation is precise used at unfavorable ground and
hard geology of it reside in at deepness more than 3 m.
Well diameter usually between 0.80-1.00 m and there is
possibility in its one diameter building differ, this enabled
because each column differ its burden.
This Well foundation is made from anaesthetizing entered
concrete into ground and into anaesthetizing the
concrete mixture input with mixture.
1 pc : 2 ps : 4 kr plus 40 – 50% stone split.
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