CÔNG NGHỆ THI CÔNG BẰNG ĐÁ GIÁO VÁN KHUÔN DI ĐỘNG-MOVABLE SCAFFOLDING SYSTEM

MOVABLE SCAFFOLDING SYSTEM
C«ng nghÖ thi c«ng
b»ng ®μ gi¸o v¸n khu«n di ®éng
Overhead MSS
Underslung MSS
Overhead MSS - Components
FRONT & REAR
NOSES
MAIN
GIRDER
TRANSVERSE
TRUSS
LAUNCHING
WAGON
PIER
SUPPORT
FORMWORK
TENSION
BARS
Overhead MSS - A typical construction cycle
After concreting, curing and tensioning of
cables, the Main Girder and the Transverse
Trusses are lowered by the main jacks at
the rear and front Pier Supports.
After concreting, curing and tensioning of
cables, the Main Girder and the Transverse
Trusses are lowered by the main jacks at
the rear and front Pier Supports.
The Main Girder is now resting on the
launching wagon. The Formwork is
disconnected from the Tension Bars.

Overhead MSS - A typical construction cycle
After concreting, curing and tensioning of
cables, the Main Girder and the Transverse
Trusses are lowered by the main jacks at
the rear and front Pier Supports.
The Main Girder is now resting on the
launching wagon. The Formwork is
disconnected from the Tension Bars.
The Formwork is now lowered and the
MSS is in the launching position.
Overhead MSS - A typical construction cycle
After concreting, curing and tensioning of
cables, the Main Girder and the Transverse
Trusses are lowered by the main jacks at
the rear and front Pier Supports.
The Main Girder is now resting on the
launching wagon. The Formwork is
disconnected from the Tension Bars.
The Formwork is now lowered and the
MSS is in the launching position.
Overhead MSS - A typical construction cycle
After concreting, curing and tensioning of
cables, the Main Girder and the Transverse
Trusses are lowered by the main jacks at
the rear and front Pier Supports.
The Main Girder is now resting on the
launching wagon. The Formwork is
disconnected from the Tension Bars.
The Formwork is now lowered and the
MSS is in the launching position.

Overhead MSS - A typical construction cycle
The MSS is ready for launching. The
launching operation to the next concreting
position is to be carried out.
NOTE
The first span is usually 0,8 x max. span. The following
pours will cantilever by 1/5 of the span lengths.
“0,8 x L” “L” “L”
Overhead MSS - A typical construction cycle
The MSS is ready for launching. The
launching operation to the next concreting
position is to be carried out.
Overhead MSS - A typical construction cycle
Overhead MSS - A typical construction cycle
and the MSS is now ready to be raised into
the concreting position.
In the next position, the Formwork is
assembled and rigged into place.
A Rear Support is rigged in place, and will
provide the lifting of the Main Girder by
means of the two rear hydraulic main
jacks.
The Suspension Bars are adjusted,
However, no Pier Support will be available
at the rear end of the Main Girder this time.
“0,2 x L”
“0,2 x L”
Overhead MSS - A typical construction cycle
The MSS is now ready to be lifted into the
concreting position.

Overhead MSS - A typical construction cycle
The MSS is now ready to be lifted into the
concreting position.
Overhead MSS - A typical construction cycle
Overhead MSS - Rio Major, Portugal
Overhead MSS - Rio Major, Portugal
Overhead MSS - Grandola, Portugal
Overhead MSS – Bid 374, Taiwan, R.O.C.
Underslung MSS - Components
SUPPORTING
BRACKETS

LAUNCHING
WAGON
MAIN
GIRDER
TRANSVERSE
BEAM
EXTERNAL
FORMWORK
INTERNAL
FORMWORK
FRONT & REAR
NOSES



Underslung MSS - Components
SUSPENSION
GALLOWS

The internal Formwork consists of several
segments approximately 5 m in length. A
specially designed trolley is used to carry
the segments as well as adjusting the
formwork itself in place using hydraulically
operated actuators.
A typical construction cycle with the
underslung MSS:
SUPPORTING
BRACKETS
LAUNCHING
WAGON
A typical construction cycle with the
underslung MSS:
SUPPORTING
BRACKETS
LAUNCHING
WAGON
MAIN
GIRDER
A typical construction cycle with the
underslung MSS:
SUPPORTING
BRACKETS
LAUNCHING
WAGON
MAIN
GIRDER
TRANSVERSE
BEAM

SUSPENSION
GALLOWS
A typical construction cycle with the
underslung MSS:
SUPPORTING
BRACKETS
LAUNCHING
WAGON
MAIN
GIRDER
TRANSVERSE
BEAM
SUSPENSION
GALLOWS
EXTERNAL
FORMWORK
A typical construction cycle with the
underslung MSS:
SUPPORTING
BRACKETS
LAUNCHING
WAGON
MAIN
GIRDER
TRANSVERSE
BEAM
SUSPENSION
GALLOWS
INTERNAL
FORMWORK

EXTERNAL
FORMWORK