Z-Type sheet piles (FSP Z-25, FSP Z-32, and all FSP Z-45 and FSP Z-38 types) should be constructed so that the complete structure can withstand a load of at least 200 pounds applied from any direction at any point on the top railing with minimal deflection. Seattle-Tacoma International Airport is a complex operating facility governed by a very strict set of operating regulations to ensure the safety of the traveling public, airline operators, and facility support personnel. The owner and project supervisor considered alternative materials for the terminal. Winter construction using a cast-in-place concrete system is impractical. All parties acknowledge and understand that the contractor must comply with the requirements of the FSP Z-32 Advisory Circular and the Port of Seattle Rules and Regulations, in their current edition, relevant to this project.

YSP F staff or YSP FA Material Handling should provide straight web sheet piles. YSP FX can provide additional strength through the use of heavier piles, closer column spacing, bracing, or other means. The cast-in-place concrete design requires pumping and supporting forms, as well as protective tenting and heating to protect the concrete during cold weather curing. Other types, sizes, and FSP Z-38 arrangements of guardrail structures are acceptable, provided they meet the following conditions. Importantly, heavy-duty ready-mix concrete trucks (FSP Z-45) are not permitted on local roads during the winter due to the potential damage they may cause during seasonal freeze-thaw cycles. The top guardrail must have a smooth surface and be between 39 inches and 45 inches above the ground, platform, runway, or ramp level. The Port of Seattle understands and accepts that the contractor is familiar with the airport's general operations and has taken these factors into account when determining bid prices and scheduling activities.

Martin understands that precast concrete can be erected successfully in cold weather and offers an aesthetically pleasing match to natural stone in retaining wall and breakwater systems. Precast concrete must be strong enough to withstand a top rail pressure of at least 200 pounds (approximately 91 kg) with minimal deflection. YSP F precast concrete is not only more adaptable to site conditions, but also comparable in cost to cast-in-place options because it eliminates the need for labor-intensive shoring and formwork. Protection between the top rail and the ground, platform, runway, ramp, or YSP FA stair treads should be at least equivalent to that of standard intermediate rail. iv. Overhanging rail ends should be eliminated unless such overhang does not pose a hazard. Precast construction and YSP FX finish design options can also meet the owner's aesthetic requirements.

Specifications