B351 - CONCRETE SIDEWALK - OPSS 351

Transcription

1 B OPSS GENERAL The design and construction of concrete sidewalks, when justified and approved in accordance with Provincial Engineering Memorandum, Director s Office # (February 2011), Revision June 2015, should be in accordance with Section D.8.4 of the Geometric Design Standards for Ontario Highways. The design and construction of sidewalk ramps should be in accordance with Provincial Engineering Memorandum, Design & Contract Standards Office # , May 15, The Ministry may pay 100% of the cost of a new sidewalk across a King's Highway, Freeway or Expressway at an interchange, intersection or flyover, provided the following conditions are met: (a) Sidewalk must be requested by the Municipality. (b) Sidewalk must be recommended by the Regional Planning and Design Section as being required from a delineation and/or pedestrian safety point of view. (c) Municipality must give a commitment to construct a municipal sidewalk to join at each end of that sidewalk to be constructed by the Ministry. (d) Sidewalk must be located within the right-of-way and cross the Provincial Highway at an interchange or intersection. (e) The Municipality must undertake to maintain and accept liability for any sidewalk constructed under the above conditions. The Ministry will pay 100% of the cost of replacing an existing sidewalk that will be damaged or destroyed by the work Concrete Sidewalk The following work is associated with the construction of concrete sidewalk, but is not included in the Concrete Sidewalk tender item. a) Excavation required to construct the sidewalk and granular foundation. The excavation required above the bottom of sidewalk grade is to be included in the tender item "Earth Excavation (Grading)" and/or "Rock Excavation (Grading)". January 2016 Page 1 of 5 B351

2 b) Granular quantities required for foundation work are to be included in the appropriate granular item. Normally, Granular A is used for foundation material. Normal sidewalk width is 1.5 metres which is also the minimum width requirements in accordance with Ontario Regulation 413/12. Wider sidewalk widths should be considered in areas of high pedestrian traffic in accordance with guidance in the Geometric Design Standards for Ontario Highways Tactile Walking Surface Indicators for Concrete Sidewalk Ramps Construction of new or replacement sidewalks and/or curbs adjacent to controlled pedestrian crossings where the concrete is placed adjacent to the pedestrian crossing require sidewalk ramps and Tactile Walking Surface Indicator Plates to be in compliance with Ontario Regulation 413/ REFERENCES Provincial Engineering Memorandum, Director s Office # (February 2011), Revision June 2015 Provincial Engineering Memorandum, Design & Contract Standards Office # , May 15, 2014 Geometric Design Standards for Ontario Highways Ontario Regulation 413/ TENDER ITEMS Concrete Sidewalk (variation item) Tactile Walking Surface Indicators for Concrete Sidewalk Ramps SPECIFICATIONS The requirements for the above tender items are contained in OPSS SPECIAL PROVISIONS The designer should refer to Chapter 'E' of this manual to review the applicable special provisions. January 2016 Page 2 of 5 B351

3 351.6 STANDARD DRAWINGS Applicable standard drawings for concrete sidewalks are contained in the Ontario Provincial Standards Drawings Manual in the 300 Series DESIGN Tactile Walking Surface Indicators for Concrete Sidewalk Ramps shall only be included adjacent to controlled pedestrian crossings when: - new sidewalk and/or curb is required at a new intersection, - an existing intersection is being reconstructed or widened which impacts the existing curb ramps, - the existing sidewalk and/or curb requires replacement due to condition, or - the existing sidewalk and/or curb must be removed and replaced due to new traffic signal installation or other work. In all other cases, existing sidewalk ramps in accordance with OPSD (October 1, 1993) in each quadrant of an intersection may remain in place and should not be retrofitted with tactile walking surface indicator plates COMPUTATION This is Plan Quantity Payment item Source of Information The main sources of information for Concrete Sidewalk are the B-Plans, Crosssections, the local Municipality and the Regional Geotechnical Section Method of Calculation The unit of measurement for Concrete Sidewalk is the square metre and is calculated using the horizontal design dimensions. The typical depth of concrete for sidewalks is 125 mm, increased to 150 mm across residential driveways, and 200 mm across commercial and industrial driveways. The depth may be increased at the request of the Municipality providing the Municipality agrees to absorb the additional costs. January 2016 Page 3 of 5 B351

4 Grading required for sidewalks is calculated in cubic metres. The depth of excavation is to include the concrete thickness. The grading quantity is to be added to the tender item Earth Excavation (Grading). The granular foundation depth is normally 100 mm for concrete sidewalk. The granular quantity in tonnes is added to the appropriate granular tender item. Unsuitable soils below the granular foundation are typically sub-excavated and replaced with suitable earth or select subgrade material Tactile Walking Surface Indicators for Concrete Sidewalk Ramps Quantities are computed for each set of Tactile Walking Surface Indicator Plates installed at each sidewalk ramp. A set of two Tactile Walking Surface Indicators for Concrete Sidewalk Ramps at each ramp location is counted as a quantity of DOCUMENTATION The location for placing sidewalks is to be indicated on the construction plans of the contract drawings. Concrete sidewalks and sidewalk ramps require the indication of the appropriate standard drawing number on the plans. The width of sidewalk is indicated on the plans. Quantities for earth excavation, granular and concrete sidewalk constructed at the expense of a Municipality are to be clearly defined by Station to Station on the appropriate Quantity Sheet. The granular foundation quantity is added to the roadway granular item and identified as a separate entry on the quantity sheet showing the depth of granular on the same line. The grading quantities for concrete sidewalk are added to the tender item Earth Excavation (Grading) and shown as a separate entry on the Quantities - Grading sheet. Concrete Sidewalk is a variation item. The variation is the sidewalk depth, with typical values of 125 mm, 150 mm, and 200 mm. Each variation requires a separate column on the Quantities Miscellaneous sheet. Sidewalk locations are documented by station to station limits and offsets right or left of the roadway centreline on the Quantities - Miscellaneous sheet. The individual column entries are totalled into the tender total which is transferred to the Form of Tender. Tactile Walking Surface Indicators for Concrete Sidewalk Ramps locations are depicted on the contract drawings with the appropriate OPSD number shown. The applicable Standard Drawings shall be included in the contract. January 2016 Page 4 of 5 B351

5 Tactile Walking Surface Indicators for Concrete Sidewalk Ramps quantities are computed and entered on the Quantities-Miscellaneous sheet under the appropriate column heading, showing station and location, left or right of centreline. The column entries are totalled and transferred to the Form of Tender Documentation Accuracy Stations are recorded in whole numbers. Quantity entries for Concrete Sidewalk are recorded in whole number square metres. Quantity entries for Tactile Walking Surface Indicators for Concrete Sidewalk Ramps are recorded in whole numbers. January 2016 Page 5 of 5 B351