Boat Ramps

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Push Slab Ramps

Push slabs should be formed and poured on dry land on a thin layer of sand or small gravel known as crusher run. The slope of the poured slab should be as close to the desired slope as possible. After the concrete has cured (10-14 days depending upon weather), push the slab into place with a bulldozer or track machine. Push slabs should be small enough to be accurately placed by available equipment. A 6-inch concrete slab 14 feet wide and 20 feet long will weigh about 10 1/2 tons. The same width slab cast 30 feet long will weigh about 16 tons, which can be accurately and safely pushed with a D-5 bulldozer. If necessary, half of the ramp can be constructed as a push slab, and the remaining above-water section can be cast in place. If this approach is taken, rebar should be laid and left extended in the upper end of the push slab to provide secure tie-in of the cast portion of the ramp. This will prevent the sections from separating over time. It is better to construct a push slab ramp during low water levels to ensure proper ramp length.