8-35 When barrier is being constructed near traffic, d o not start installation of the precast concrete
barrier until all components are prepared for a complete continuous installation, including the guardrail and guardrail anchors approaching the barrier. Once work has begun on a barrier installation, continue the work to its completion unless weather or other conditions beyond the control of the Contractor interfere with the work. Use any of the several alternate delineator types for barrier shown in the plans, but only one delineator type for barrier at any one time throughout the project. The delineators con sist of a reflector and base or casing. Attach the delineator to the barrier as shown in the plans. Only one attachment position will be permitted throughout the project length. Position delineators perpendicular to the centerline of the road. Use yellow delineators in the median and on the left side of one -way ramps, loops or other one -way facilities. Use white delineators on the right side of divided highways, ramps, loops and all other one -way or two-way facilities. In all cases, the color of the d elineator shall supplement the color of the adjacent edgelines.
857-4 Measurement and Payment
There will be no measurement made of barrier delineators as they are incidental to the other pay items in this specification. Precast Reinforced Concrete Barrier, Single Faced will be measured and paid in linear feet of barrier that has been completed, placed on the road and accepted. Measurement will be made along the top surface at t he centerline of the barrier with no deduction made for joints. Price includes , but is not limited to , furnishing and placing concrete and reinforcing steel, transporting and placing precast units, grout, joint filler, hardware, galvanizing, constructing joints and furnishing and installing barrier delineators. Concrete Barrier Transition Section will be paid in accordance with Section 854 -4. Payment will be made under: Pay Item Pay Unit Precast Reinforced Concrete Barrier, Single Faced Linear Foot ADJUSTMENT OF CATCH BASINS, MANHOLE S, DROP INLETS, METER BOXES AND VALVE BOXES
858-1 Description
Raise or lower existing catch basins, manholes, drop inlets, meter boxes and val ve boxes encountered within the limits of the project to match the adjacent finished work.
858-2 Materials
Refer to Division 10. Item Section Asphalt Plant Mix 1020 Brick 1040 -1 Concrete Block 1040 -2 Curing Material s 1026 Grout, Type 3 1003 Joint Filler 1028 -1 Joint Sealers 1028 -2, 1028 -3 Mortar 1040 -9 Portland Cement Concrete, Class B 1000
8-36 Item Section
Precast Risers 1077 Reinforcing Steel 1070 Steps 1074-8
858-3 Construction Methods
Perform the adjustment with brick masonry, block masonry or Portland cement concrete on existing walls in accordance with Subarticle 840 -3(C). Adjust manholes, meter boxes and valve boxes as provided above by us ing approved fittings. When fittings are used, leave the existing walls in place and securely attach the fittings to the existing walls or install in a manner that will eliminate movement of the fitting. Reconstruct manhole structures where the chimney and frame and cover height will exceed 24 inches . Pre-cast manholes shall be reconstructed by removing cone and/or straight section(s) and replacing with a section(s) of such length that the manhole cover will be at the correct elevation or can be raised to the correct elevation by the addition of adjusting rings. In the case of brick- type top sections, replace with brickwork. Brick manholes are recon structed by removing all the brick courses that make up the cone or tapered section. By increasing or decreasing the height of the brickwork in the straight section of the manhole, the rebuilt brick cone section will position the manhole cover at the corr ect elevation, or it can be raised. Should a junction box with a manhole ring and cover need to be adjusted, break down the junction box and rebuil d so that the adjustment, including ring and cover and the thickness of any top slab, does not exceed 24 inches. Construct in accordance with the contract. Backfill excavated areas in an existing pavement with Portland cement concrete. High early strength concrete may be used. Wait at least 72 hours after the placement of the concrete before placing any surf acing or resurfacing material over the concrete. This time period will not be required where the strength of the concrete is at least 2 ,500 psi as evidenced by nondestructive tests made in place by a rebound hammer in accordance with ASTM C805. Thoroughl y compact backfill of other excavated areas. In areas to be opened to traffic, construct a temporary ramp of asphalt plant mix 360° around the adjusted structures within one calendar day after completing the adjustment . Construct the ramp with a tapered slope of not less than one foot per inch of height in traffic sections with a speed limit of less than 3 5 mph and 1.5 f eet per inch of height to a maximum of 3 feet from the structure in traffic sections with a speed limit of 35 mph or higher . Construct the ramp using any type of asphalt surface course plant mix meeting the requirements of any job mix formula issued by the Department for a Department project. Compact to an approved density. Place bituminous plant mix f lush with the top of the raised structure within 7 days after raising the structure. Make the adjustments before the final layer of surfacing material is placed in areas to be surfaced or resurfaced. Salvage and reuse existing frames, grates, manhole covers, rings, meter boxes and valve boxes in the adjustment.
858-4 Measurement and Payment
Adjustment of Catch Basins will be measured and paid in units of each for catch basins satisfa ctorily adjusted. Adjustment of Drop Inlets will be measured and paid in units of each for drop inlets satisfactorily adjusted. Adjustment of Manholes will be measured and paid in units of each for manholes satisfactorily adjusted. Payment will not be made for both an adjustment and reconstruction. Adjustment of Meter Boxes or Valve Boxes will be measured and paid in units of each for meter boxes or valve boxes satisfactorily adjusted.