In the cutaway, there is a 16’ x 16’ clearance for cars, then there is a multi-layered cake over the ROW. How deep is each layer and what is the purpose?
There are two general areas – the beam areas and the trench areas. Working from the bottom up for each: Beam Areas: Fireproofing (1″) to protect the deck structure; Concrete Box Beams (4’ – 6″) to support the weight of the park elements; Concrete slab (8″) to provide working platform for construction, support park elements; Waterproofing/drainage mat (1/2″) to collect moisture for plants, prevent seepage into tunnel; Soil (varies, 12″ minimum) for plant growth. Trench Areas: Fireproofing (1″) to protect the deck structure; Concrete trenches (8″) to support the trees and utilities; Waterproofing/drainage mat (1/2″) to collect moisture for plants, prevent seepage into tunnel; Lightweight fill and soil (3.7’ lightweight fill, 2’ soil typical) for plant growth or soil and trees.
