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| Who is the founder of the Chicken Claw Building Foundation - Prof. Dr. (HC) Ir. R. M. Sedyatmo |
Career
His career in the
academic world began on October 1, 1950 with his appointment as an
extraordinary lecturer for vak Waterkracht (the field of hydropower) in the
Civil Engineering Faculty of Engineering, University of Indonesia Bandung
(ITB). On August 1, 1951 he was officially appointed as extraordinary professor
in the field of hydropower. He is the second native professor in ITB's civil
department after Prof. Ir. Roosseno. At the third
Lustrum (15th Anniversary) Bandung Institute of Technology on March 2, 1974
Sedyatmo received an honor in the form of Doctor Honoris Causa in Engineering
from the ITB Senate, on the basis of an assessment of his services as an
engineer, with promoter Prof. Ir. Soetedjo.
History
Prof. Dr. Ir.
Sedyatmo in 1961 when PLN officials had to establish seven high voltage power
towers in the Ancol swamp area of Jakarta. With difficulty, the two towers
were successfully established with a conventional foundation system, while the
remaining five towers were still abandoned. The tower delivers electricity and
an electric power center at Tanjung Priok to the Senayan Sports Center where
the 1962 Asian Games sports party will be held.
Because the time is very urgent, while
the conventional foundation system is very difficult to implement in the
swamps, a new system is sought. The idea of Ir. Sedyatmo to erect a tower on
a foundation consisting of concrete plates supported by concrete pipes below
it. The pipes and plates are monolithically attached, and gripping the ground
softly.
By sedyatmo, the findings were named
chicken paw foundation systems. The tower can be completed on time, and remains
firmly established in the Ancol area which is now an industrial area. For areas
with soft soil, chicken claw foundations are not only suitable for building
buildings, but also for making roads and runways. One more advantage, this
system does not require a drainage system and receding connections.
Structure
The foundation of
chicken claws consists of relatively thin reinforced concrete plates supported
by buis-buis reinforced concrete mounted vertically and monolithically combined
with concrete plates at a distance of 200-250 cm. The thickness of the concrete
plate ranges from 10-20 cm, while reinforced concrete pipes are 120 cm in
diameter, 8 cm thick and range from 150-250 cm. Buis - buis concrete is useful
for plate stiffeners. In supporting the building load, buis-concrete plate and
confined soil in the foundation work together, thus creating a composite system
which in its overall way of operation will be identical to the foundation raft
foundation.
The mechanism of the chicken claw
foundation system in carrying the burden of the observations is as follows:
If above the plate the point load works,
the load makes the plate fade. This deflection causes buis - buis rotating
chicken claws. Observations on the model show the rotation of the chicken claw
mobilizing lateral soil pressure behind the chicken's claw and is a moment
against plate deflection. Thus, how to reduce deflection, the greater the
moment against the chicken's claw to fight deflection, the greater the
deflection reduction. The opposing claw moment is affected by claw dimensions
and soil density conditions (shear strength) around the claw, ie the longer and
also the width of the claw, the greater the opponent's moment against the plate
deflection that can be obtained.
Many buildings have used Prof.'s chicken
claw foundation system. Sedyatmo, including hundreds of high voltage PLN
towers, aircraft hangars with a stretch of 64 m in Jakarta and Surabaya,
between runway and taxi way and apron at Soekarno Hatta Airport in Jakarta,
Pluit access road - Cengkareng, fertilizer factories in Surabaya, swimming
pools and tribune in Samarinda, Palembang - Indralaya toll road, and hundreds
of high-rise buildings in various cities.
The chicken claw foundation system has also been widely
known in various countries, and has even received international patent
recognition in 40 countries, namely: Indonesia, Malaysia, Singapore, Thailand,
Philippines, Vietnam, India, China, Japan, South Korea, Mexico, Saudi Arabia,
Bahrain , Sri Lanka, Brazil, Qatar, Soviet Union, Burma, Egypt, South Africa,
Portugal, Spain, Argentina, Chile, Australia, Brunei Darussalam, New Zealand,
Morocco, West Germany, East Germany, England, Italy, Belgium, Canada, America
United, Netherlands and Denmark.
