OVERLOOK DESIGN DOCK DESIGN. Conceptual Design For Overlook. Conceptual Design For Trail Access via Dock

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4 OVERLOOK DESIGN Conceptual Design For Overlook DOCK DESIGN Conceptual Design For Trail Access via Dock

5 TRAIL/BOARDWALK SURFACES Compacted Gravel Trail Not suitable for some trail uses (i.e. rollerblading). Simple installation and low cost. Maintenance is high due to displacement of gravel by use. Asphalt Trail Suitable for all trail uses. Simple installation (but requires the use of compacting equipment) and medium cost. Maintenance requirements are low. Wooden Boardwalk Suitable for most trail uses, but has noise associated with bicycles and rollerblades. Installation is more complicated and has a higher cost. Maintenance requirements are medium. Concrete Trail Suitable for all trail uses. Relatively simple installation, but a high initial cost. Maintenance requirements are low.

6 TRAIL SECTIONS Gravel Trail Section Asphalt Trail Section Pile Supported Boardwalk Section

7 TRAIL SLOPE DESIGN Trail constructed on level land (0-5%) This option depicts a trail constructed on a cross-slope of between 0 and 5%. This kind of trail is simple to build due to little impact on surrounding landscapes. Trail constructed on sloping land (5-15%) This option depicts a trail constructed on a cross-slope of between 5 and 30%. This installation type requires a 3:1 slope to match each side of the trail into existing conditions. Trail constructed on steep land (15-30%) This option depicts a trail constructed on a cross-slope of between 15 and 30%. In order to minimize the disturbance to adjacent terrain, a wall on the uphill side is shown. The wall could be constructed of a variety of materials (stone, concrete or wood) and its height is dependent upon the routing and slope of the trail.

8 BOARDWALK SURFACES Trail surfaces for boardwalks and floating trails vary in their longevity, maintenance requirements, and the uses that they can support. Wood Decking - High level of aesthetics. Installation is relatively easy and cost efficient. It is a suitable material for most uses. Concerns are the noise generated by bicycles and rollerblades, and slipperiness when wet. Slipperiness can be mediated by laying welded wire fabric over the planking to provide a gripping surface, or applying an epoxy or similar coating that provides grip. Plastic Decking - High levels of aesthetics are possible. Roughened plastic can be used as a surface and has the benefit that it is is impervious to water and therefore will not accommodate rot or mold. wood decking plastic decking Concrete Decking - High levels of aesthetics are possible. Concrete installation is is more expensive, but has low maintenance requirements. FLOATING BOARDWALK concrete decking modular/prefab Depending upon construction method, the use of a floating boardwalk/trail would not have as great an initial cost as a boardwalk with standard footings. With a modular design, installation and maintenance become easier. Superdeck is one manufacturer that ensures self-contained flotation with low-maintenace surfacing and flexible designs to accommodate many needs custom floats This option can accommodate special needs, but since it is a custome design, requires more planning in the design phase. One example for custom floats is the use of capped PVC pipes (as shown to right). Floating Trail A floating trail is best suited to areas of nonfluctuating water. The type of decking can vary, and can potentially affect the safe range of users. The trail needs to be anchored securely, provide an accessible transition to the land portion of the trail, and be stable. The design must accomodate all desired users, including the potential for maintenance vehicles.

9 BOARDWALK SECTION Standard Boardwalk/Trail This option depicts a trail section using a boardwalk design. Using footings for the boardwalk would ensure the greatest level of stability for the users and likely a longer lifetime for the boardwalk. The use of handrail may be necessary where the distance from decking to the water surface or ground is greater than 30. Footings will depend upon the soils below. BOARDWALK FOOTINGS Wood Piles Some excavation is required. This is a very stable footing type and is suited well to a range of soils. Helical Piles Some excavation is required. This is a very stable footing type and is suited well to organic soils. Concrete Footings Substantial excavation is required and works best in substrates ranging from inorganic soils to rock. This is a very stable footing type. Pin Footings No excavation is required and the finished grade is not disturbed during installation. This is a very stable footing type and is suited well to organic soils.

10 BRIDGE OPTIONS Prefabricated Bridge Module(s) The aesthetics of prefabricated structures depend completely on their design. Pre-fabricated structures can be made using a variety of materials and techniques. The benefit is that bridge modules can be constructed in a controlled manner, and brought to the site for quick installation. The main limiting factor is the size of any given module and the number required. Access to the site for transportation and cranes might be the limiting factor on the size of the bridge module used. This in turn determines the requirements for footings and the associated disturbance to the site from site-preparation for installation and the area needed for installation equipment to operate within. The overall benefit of prefabrication may be reduced cost, potentially reduced site impact and overally higher quality and longevity (depending upon materials and construction method). On-Site Construction Similar to prefabrication, the aesthetics of bridges constructed on-site depend completely on their design and the materials and techniques used. The concerns with on-site construction include material transportation, landscape disturbance and the lack of predictability for some variables (based on weather, supplies, etc.). BRIDGE TYPES Glu-Lam Pre-Engineered Wood Glu-Lam and Pile Support Combo

11 BRIDGE TYPES Steel Bow Truss Pre-Engineered Steel Modified Steel Bow Truss Metal Girder Cable Stay Fiberglass