806 - Bicycle Paths
806 - Bicycle Paths
GENERAL
Construction of bicycle paths consists of grading, placement of either concrete or HMA materials and restoration of the area. Bicycle paths will be constructed according to alignment, grades and typical sections shown on the plans, or as established by the Engineer.
Equipment used for constructing bicycle paths will not damage the grade or cause damage to adjacent pavement, curbs, trees, vegetation or lawns outside the grading limits. The use of oversize equipment is at the Contractor’s own discretion and risk.
MATERIALS
See Division 5, HMA and Division 6, Concrete for general materials requirements. Review the plans and Standard Specifications for Construction for specific mixes or grades of paving materials to be used.
CONSTRUCTION
A smooth riding surface is important for the high tire pressures generally found in bicycle tires. To achieve this smooth surface, care is needed in construction of the base, surface and joints.
Base Preparation
Base preparation is important for successful placement of concrete and HMA materials and long-term service life of the path. Complete removal of vegetative cover and root mat to a depth of at least 2 inches (50 mm) is necessary to avoid future vegetative growth up through the bike path. However, the use of herbicides to kill roots and vegetative cover is not recommended. Wind drift from herbicide spray could cause collateral damage to adjacent vegetation, shrubs and lawns.
Subgrade should be smoothed and trimmed to the tolerance specified and as directed by the Engineer. Compaction of the subgrade should be uniform and sufficient to support paving equipment and hauling units. Random checks should be made of the subgrade for smoothness, grading tolerances and compaction.
The profile should be checked during subbase preparation and adjustments made to provide surface drainage away from the path. Avoid trapping surface water on the bicycle path or the drainage of large quantities of water over the path.
Paving
After final rolling of a HMA path, or screeding of a concrete path, the surface will be checked using a 10 foot (3 m) straightedge. Variation of more than 1/4 inch in 10 feet (6 mm in 3 m) must be remedied.
Curb Drops and Driveways
The rise at the back of the gutter pan for curb drops must be a smooth, rounded transition, not a sharp rise or an abrupt curve. The bicycle path slope to the curb drop, driveway or street must meet slope requirements as specified for sidewalk ramps.
Restoration
After backfilling along the path, the area will be restored using topsoil, roadside seeding and mulch.
MEASUREMENT AND PAYMENT
Measurement and payment will be as specified in the Standard Specifications for Construction. Note that all excavation, including subgrade undercutting to remove unsuitable material, is included in the pay item Bicycle Path, Grading and is not paid for separately.
The use of oversize equipment will not be construed as changed field conditions and therefore is not eligible for added compensation.