Control and supervision of construction works of the bridge Hellibongo on the Chari river in the Barh Koh department
Country
ChadName of Client
Ministère des Infrastructures et des TransportsFinancing sources
Budget Général de l'EtatAssociation
ECOTOPO (Chad) (member)Duration
06/2010 - 11/2012Project Description
The works concern the construction of a reinforced concrete bridge crossing the Chari river in Hellibongo. Its length is 281 m (14 spans of 20 m each).
Substructure : 2 abutments and 13 piers:
- foundations on reinforced concrete perforated piers of 1200 mm of diameter and length between 24 and 27 m for a total of 94 piers ; 6 piers per pile and 8 per abutment (2 x 8 + 6 x 13) ;
- bedplates : 6.00x9.60 x1,60 m of thickness
- piles realized with 3 circular reinforced concrete columns of 1200 mm of diameter and variable height between 3.70 and 8.70 m
- main beam : 1.60x9.30x1.00m of thickness
Deck superstructure :
- ten reinforced concrete beams 1,00 m high and with a thickness of 32 cm per prebuilt beam;
- slab of 18 cm of thickness and casted on prestressed floor support slab of 5 cm of thickness.
Complementary works and drainage works carried out along the access Sarh side :
- one multiple box culvert with 7 frames of 8.20x9 m of height for a total length of 65.50m ;
- 2 double box culverts 2x5.00x7,11m of height ;
- 1 quadruple box culvert 4x5.00x7.11m of height.
Services Description
Check and evaluation of the works; Final design and quantity analysis to be implemented ; Review of Enterprises proposals (site organization and work schedule, site infrastructure) and of possible variants proposed during tender procedure; Analysis of unit prices, their breakdown in categories; Quality control procedures applied by the Enterprise to its works and to the sub-consultants work; Analysis of the formula allowing to calculate possible price adjustment ; Analysis and review of final execution drawings ; Technical and topographic inspection of locations; Economic and financial control according to works progress; Administrative personnel training for maintenance and rehabilitation roads and structures works.
