![]() ![]() When RSJ used over double rows of pile trestle for longer spans, one m.s. Timber beams are used for 3.0 m span superstructure and these beams are seated on single pile trestle by m.s. 18.1 and double rows for 4.5 m and 6.0 m span as in Fig. ![]() The piles may be in single row for 3.0 m span as in Fig. These driven depths shall be below the bed level taking into consideration of the possible scouring of the bed if any. diameter driven to 3.0 m for 3.0 m span bridges and 4.5 to 6.0 m for 4.5 m and 6.0 m span bridges. The pile trestle is composed of a cluster of piles usually 200 mm. Timber bridges are generally constructed on salbullah pile trestle as sub-structure and foundation and timber decking over timber beams or over RSJ as superstructure. Callender-Hamilton (Unit Construction) Bridge 4. This article throws light upon the five main types of low cost bridges.
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