TECHNICAL SPECIFICATIONS AND STANDARDS/CODES FOR BRIDGES
Ministry of Road Transport and Highways (MoRTH) specifications are followed for execution of bridge projects . These specifications are based on codes published by the Indian Roads Congress (IRC), Bureau of Indian Standards (BIS) and other International Standards.
Indian Roads Congress Codes/Special Publications
Codes published by the Indian Roads Congress prescribe specifications and standards for various items of road and bridge works. It also stipulates the tests to be done and methods of sampling. Guidelines regarding various constructional aspects in bridge construction are also published by the name Special Publication (SP) by IRC.
Indian Standard Codes
Bureau of Indian Standards (BIS) have published several Codes prescribing specifications required for materials for bridge construction. It also stipulates the quality tests to be done and methods of sampling. BIS codes or any approved standards shall be followed in bridge construction wherever the IRC codes are not published or silent.
American Society for Testing and Materials (ASTM)
ASTM/DIN standards are suggested to be followed for certain items of work where IRC/BIS codes are not published or silent.
CLASSIFICATION OF BRIDGES AND CULVERTS
The bridges are generally classified based on the total span length as:
Culvert: It is a cross-drainage structure having a total length of 6 metres or less between the inner faces of the dirt walls or extreme ventway boundaries measured at right angles thereto.
Bridge: It is a structure having a total length above 6 metres between the inner faces of the dirt walls for carrying traffic or other moving loads over a depression or obstruction such as river, road or railway. Bridges are further classified into minor and major bridges. A minor bridge is a bridge having a total length of upto 60 metres while, a major bridge have a total length above 60 metres.
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