Description: Beam Bridge
Prototype Information
Engineering
It appears that the trestle is using timber harvested from the bridge site. A rough guess suggests each bridge section consists of two lower timbers approximately 3 foot in diameter acting as stringers, approximately 16 foot ties ( regular 8 foot plus 4 foot each side the ties) and two additional upper stringers also 3 foot in diameter (notice the larger diameter of the near upper stringer - it probably was the base of the tree before cutting) . Notice that the upper and lower stringers are wrapped in wire rope around mid span.
The piers for this bridge appear to be 4 bents with 9 piles as a minimum with additional piles for the narrow breakwater. For these piers I am thinking the two outer bents built as 9 piles and the two inner bents built as 11 or 12 piles to provide support for the breakwaters.
I have not found any common standard drawings for these types of piers. There are drawings for wood abutments and i will use those drawings for the breakwater timbers.
The WWSL
First Bridge. Someday I'm going to build this bridge as a AP project. See Satsop River Bridge N5e for construction details
Scratchbuilding
No comments:
Post a Comment