120
X2
Category 2: Civil Structures
Software: Scia Engineer
Engineering Study - Yeongam River, Korea
The project concerns the conceptual design and
calculation advice for the Yeongam floating sector gate
in South Korea.
A new navigable channel is being built between the
lower reaches of the Yeongsan and Yeongam rivers
in South Korea as part of an extensive regeneration
scheme.
For the water control of this channel, two types of
weirs are used. In a bypass a series of vertical lifting
doors and for the navigable channel a floating sector
gate similar to the “Maeslantkering” sector gate in the
Netherlands.
The Yeongam Floating sector gate in Korea is the first
weir of this type in South-East Asia.
The navigable channel is 60 m wide. The weight of the
gate is approximately 250 tonnes each and it revolves
around a spherical bearing to adjust to the varying water
levels and buoyancy situations. Each gate is opened
and closed by a set of winches. The winch operating
wires are guided on the outside face of the gate leaf.
For the engineering company EPS Solutions Co.
Ltd., ARCADIS has provided conceptual design and
calculation advice for the Yeongam floating sector gate
during the detailed design phase. Advice was also given
on the engineering items which related to the hydraulic
behaviour and the mechanical parts, such as the winch
system, the hinge connection and the buoyancy/ballast
tank system.
Structure
For the conceptual design, a model in Scia Engineer
has been made. The structure can be divided into the
pair of arms and the floating body. The arms come
together at the hinge and are connected at two-thirds
with an intermediate structure.
The arms decrease in width towards the hinge and are
built up out of circular hollow sections. The main outside
sections are CHS 508 x 12. The diagonals are CHS 216
with various wall thicknesses. At the connection with the
intermediate truss, CHSs are also connected with the
floating body. At these locations the main sections have
the increased wall thickness of 25 mm.
The weir itself, the floating body, is built as a stiffened
plate structure with the height of 7 m. The floating body
is divided into 7 segments. The separation between the
segments is watertight. Each segment has an upper
and bottom part. The bottom part is used for buoyancy
and every bottom segment can be individually filled for
perfect trim.
For the upper part, only the front plate is the actual
separation between the different water levels. In these
segments the water can freely come in at the rear side.
This also provides stability.
The plate thickness of 16 mm is used for the front
plates, most of the other plates in the structure are
12 mm. The stiffeners, bulb-flats, are vertical placed in
the front and rear plates. The stiffeners in the top plate
are trough shaped.
For the wire of the winch at the top, additional
reinforcements are provided.
The housing of the bearing is also built up out of plates.
Scia Engineer has been used for a verification of the
forces in the elements.
Out of the box
New is that Scia Engineer has been used for a 3D
visualisation. By making a screenshot from approx. 175
situations, an animation is created.
