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Technologies available and Systems owned, applied and ready to be applied in bridges
construction.
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The launching girder system
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The Arab Contractors has a complete Launching Girder system with bearing capacity
up to 150 tons to construct spans up to 45 m.
The launching girder system help in conquering the adverse site conditions and congested
area. A simple explanation of this method is that a fabrication area is constructed
at first. The bridge beams are concreted and prestressed. These beams are transported
to position using a special carriage system. These trusses move until they are supported
on the columns of the required span, then they lift the prestressed concrete beams.
This system was used in 6 TH of October elevated road and Cairo Ring Road – 9D sector
elevated road.
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The Cantilever Carriage System
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The Arab Contractors company has 16 complete cantilever carriage systems.
The cantilever carriage system is used for the construction of the superstructure.
It helps in conquering the adverse site conditions (i.e. over water, terrain areas,
high elevations, etc.) A typical cantilever carriage set consists of a steel truss
that is fixed to the stump. Thus, a shuttering and working platforms can be provided
for pouring the superstructure on stage (i.e. usually between 3 to 5 m). The construction
procedures start by constructing the stump (i.e. part of the superstructure over
the columns). The length of the stump is usually around 15 m. Then, the cantilever
carriage sets are assembled on both sides of the stump. After concreting and stressing
each stage, the carriage moves to the next position. The key element here is preserving
all the time the balance between the two cantilevers at both sides of the bridge.
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The Arab Contractors Company used the cantilever carriage system in several projects
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- Bani Suief Bridge ……..…… 80 m navigation vent.
- New Banha Bridge …….…... 120 m navigation vent.
- Rod El-Farag Bridge ……..…… 130 m navigation vent.
- El-Moneeb Bridge ……..…… 150 m navigation vent.
- El-Warrak Bridge ………….. 120 m navigation vent.
- Meet Ghamr - Zefta Bridge ….….. 84 m navigation vent.
- 15th Of May Bridge …………. 115 m navigation vent.
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The Climbing Formworks
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The Arab Contractors Company has 6 complete climbing formwork systems with up to
4.5 m length, 3.5 m width and 5m height. The climbing formworks used in several
projects for the construction of the columns. Normally, the shuttering consists
of the columns sides and working platforms (i.e. around 3 platforms). The first
one is for the steel fixing. The second is for enabling carpentry and adjustment
works. The third is for finishing works of the concrete surface. The system used
in several projects (e.g. Suez Canal Bridge – East portion).
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The Advancing Shoring System (flying shuttering)
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The Arab Contractors Company has 3 complete flying shuttering systems with up to
20 m width to construct spans up to 42 m. The advancing shoring system (i.e. flying
shuttering) like the cantilever carriage helps in conquering adverse ground conditions,
heavily congested areas, or in high elevations of the superstructure. The system
transfers the load to a steel structure supported on the columns by means of steel
brackets. This system used in 6th of October elevated road as well as in Suez Canal
Bridge – East portion.
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Combined System
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Most of the projects contain one or more of the previously mentioned systems. For
example, part of the 6th of October elevated road was built using cable stays. This
part has incorporated more than one system. The climbing formwork used for the pylon
construction. The cantilever carriage used for the deck segments construction. The
cable stays used to transfer the deck loads to the pylon.
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