Some vital components of pre-stressed bridge
Pile foundation and pile cap
Pile foundations are the inherent part of a structure that is utilized to bear and transmit the load of the structure to the bearing ground situated at some depth underneath ground surface. The major elements of the foundation are the pile cap and the piles.
The piles belong to long and slender members which transmit the load to deeper soil or rock with extreme bearing strength to get rid of shallow soil of low bearing strength. The prime materials applied for piles are wood, steel and concrete.
Piers of bridge
If possible, slender piers should be applied in order that there is adequate flexibility to facilitate temperature, shrinkage and creep effects to be transferred to the abutment devoid of requiring for bearings at the piers or intermediate joints in the deck.
Deck slab of bridge
Deck slab belongs to the top most section of the bridge structure. It is the vital component of the super structure to bear load directly and transmit into column.
The purpose is to circumvent the application of joints over abutment and piers. Expansion joints are likely to leak and facilitate the penetration of de-icing salts into the bridge deck and substructure. Normally, all bridges are formed continuous over intermediate supports and decks below 60 metres long containing skews not surpassing 30 degree are made integrated with their abutments.
Parapet and drainage
Parapet acts as a safety barrier that is set up on the edge of a bridge or on a retaining wall or equivalent structure where there exist a vertical drop and which may include extra protection and control for pedestrians and other road users.
The following materials are utilized in bridge
- M25 for foundation work (1:1:2) (Nominal)
- M30 for piers (Design Mix)
- M35 girder and deck construction (Design Mix)
Concrete is delivered by RMC plant (SKM)
- 6 mm and 8 mm in deck
- 8 mm and 10 mm in girder
- 10 mm and 18 mm in piers
- 10 mm and 25 mm applied in piles
High tensioned wire for stressing of girder.