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TCC
Dammam Exchange Building is a major working telephone exchange
building. The Exchange building is more than twenty three years old.
The building is a five-storey reinforced concrete construction
arranged on a rectangular grid pattern of columns, beams and solid /
waffle slab construction. The entire area of the building is about
3500 m.
Floor levels 1 to 5 are typical in layout. Both solid and waffle
type slab construction is employed for floor slabs. The waffle slabs
are supported by an orthogonal grid of beams of uniform spacing. The
overall length of the development necessitated the introduction of
expansion joints throughout the building.
Structural defects, cracks, delamination, water leaks, and dampness
are visible in many places within the building. Structural survey
and tests have been carried out by Al-Rabiah & Partners, Dames &
Moore and Al Hoty Stanger. The results show high chloride and
sulphate levels, deep carbonation, high concrete porosity, high
potential for corrosion and unacceptable compressive concrete
strength by the ACI Code.
Saudi Telecommunication Company appointed Bullivant Arabia Ltd. as a
Contractor to perform Structural repairs to the TCC Exchange
building. The following scope of work was carried out for critical
structural repairs to allow the safe evacuation of equipment and
personnel over the next five years.
** Repairing beams, columns, slabs and staircases to upper floors and
penthouses. This included removal of bad concrete, cleaning or
replacement of corroded steel, patching or casting of repair
materials and painting to match the existing surface.
** Repairing cracks in the waffle slabs by epoxy injection and
surface sealants at the parking levels 1 & 2 and upper floors.
** Repairing the two mechanical room roof slabs on the fourth floor
damaged by corrosion of reinforcement.
** Repairing the four toilet slabs, store roof slabs and carrying out
necessary repairs to toilets.
** Repairing roof parapets by removing the deteriorated part and
constructing new.
** Demolition and reconstruction of the boundary walls.
** Repairing the water tank at the basement and waterproofing the
interiors.
** Replacing the water tank on the upper floor by fiber glass tanks.
** Repairing the floor, wall and column expansion joints.
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