Part r83 construction of shared paths



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Edition: June 2014 Specification: Part R83 Shared Paths


PART R83
CONSTRUCTION OF SHARED PATHS

CONTENTS


  1. General

  2. Earthworks

  3. Compaction

  4. Asphalt

  5. Concrete

  6. Elevated Path

  7. Miscellaneous


1. general
This Part specifies the requirements for the construction of paths used for cycling and pedestrians (“Shared Paths”).
The type, configuration and extent of the Shared Path must be in accordance with the Contract Specific Requirements or the drawings. If there is no applicable configuration in the Contract Specific Requirements or the drawings, the configuration specified in this Part must apply.
Documents referenced in this Part are listed below:

DPTI: Guide to Bikeway Pavement Design Construction & Maintenance for South Australia, available from: http://www.dpti.sa.gov.au/contractor_documents/guidelines_and_miscellaneous.

Austroads AGPT04B-14 “Guide to Pavement Technology Part 4B: Asphalt”

Austroads: AP-G88 “Cycling Aspects of Austroads Guides”



AS 2150: Hot mix asphalt - A guide to good practice
In addition to the requirements specified in this Part, the construction of the Shared Path must comply with the recommended practice in DPTI Guide to Bikeway Pavement Design Construction & Maintenance for South Australia.
2. EARTHWORKS
This clause applies to minor earthworks undertaken solely for the construction of the Shared Path. Where the earthworks is constructed as part of roadworks or the cut / fill for the Shared Path exceeds 1.0 m, Part R10 “Earthworks” must apply.
All vegetation, loose material, rubbish and existing structures must be removed from the site and disposed of in an environmentally acceptable manner. Unless specified otherwise, topsoil must be stripped to a minimum depth of
100 mm. Site preparation and topsoil stripping must be restricted to the minimum area practicable for construction of the works.
Where batters are not restrained by retaining walls, the batters must be constructed at a slope which is stable and erosion resistant. Unless specified otherwise, excavated topsoil must be respread on the batters.
Earthworks fill must be constructed and compacted in accordance with Clause 3 “Compaction”. The surface of the earthworks must be trimmed and compacted with at least 1 pass of the compaction plant prior to the construction of the Shared Path. Fill material must not contain topsoil, highly plastic clay, soil classified as highly or very highly expansive, overwet material, peat or any organic material.
3. COMPACTION
Earthworks, rubble, Base course and Sub-base course must be compacted at OMC using the minimum number of passes specified in Table 3.1.


TABLE 3.1 - COMPACTION REQUIREMENTS




MIN NO OF PASSES

PLANT

Thickness
50 – 120 mm

Thickness > 120 mm

Small Vibration Plate (approx mass 90 kg - Wacker VPA 90 or equiv.)

6

8

Large Vibration Plate (Approx mass 300 kg - Wacker BPU 3345 or equiv.)

3

4

Small Twin Drum Footpath Roller Minimum 1 t (eg Ingersoll Rand DD12)

2

3

3 tonne vibrating roller class VR10 (eg Ingersoll RandDD22)

2

3

Note: The Small Vibration Plate may only be used in areas inaccessible to larger plant.


5. ASPHALT
Asphalt Pavements used on Shared Paths must be designed in accordance with the requirements of Austroads AGPT04B-14 and comply with AS2150.
Asphalt compaction must be carried out using a minimum 2 passes of a steel double drum, vibrating footpath roller. The surface of the finished asphalt must be free of segregated or "bony" areas, soft and "fatty" areas, ravelling and loose material, surface cracking, shoving and ruts.
The asphalt must comply with the following:
Material: AC7 (C170)

Minimum Thickness: 30 mm

Base Material: PM2/20 compacted in accordance with Table 3.1.

Minimum Base Thickness: 150 mm


6. CONCRETE
Concrete Pavements used on Shared Paths must comply with the following:
Minimum concrete Class: N25

Minimum Thickness: 100 mm

Reinforcing: SL62

Base Material: PM2/20 compacted in accordance with Table 3.1.

Spacing of contraction joints: 4 m

Minimum Sub-base Thickness: 100 mm


Notes:

  1. The pavements must be constructed on a Subbase of PM2/20 or PM3/20 compacted in accordance with Table 3.1.

  2. The concrete must be supplied in accordance with Part CC26 “Normal Class Concrete”.

  3. Reinforcing must be placed centrally and on spacers.

  4. All shrinkage grooves and edges must be tool finished.

  5. The surface must be finished to a non-slip texture and be protected from damage for the first 2 days.

  6. The length to width ratio of the distance between the shrinkage grooves must not exceed 1.3: 1. Expansion joints 12 mm wide and full depth of the concrete must be provided at not more than 6 m intervals and filled with bitumen or other flexible material.

  7. 3 mm wide contraction joints must be sawn to 25mm depth during initial set.


7. SURFACE FINISH
The Surface of the Shared Path must:

  1. not vary more than 10 mm over a 3 m straight edge;

  2. where a design finished level is specified, be constructed within ± 20 mm for asphalt and ± 10 mm for other surfaces;

  3. drain to the top of any adjoining kerb;

  4. be free of irregularities that could present tripping hazards to users; and

  5. smoothly abut any existing driveways and footpaths adjoining the new surface.


8. ELEVATED PATH
Where the path consists of an elevated structure (ie boardwalk), it must comply with the following:

  1. capable of being trafficked by an light maintenance vehicle;

  2. designed and installed in accordance with the manufacturer’s instructions;

  3. deck units must be placed perpendicular to the direction of travel;

  4. the gap between planks not exceed 5 mm;

  5. chamfer on the edge of the plank must not exceed 5 mm; and

  6. consist of:

  1. recycled plastic (Replas Endroplank http://www.replas.com.au/ or equivalent); or

  2. precast concrete.

Timber decking or products incorporating recycled timber are not permitted.


8. MISCELLANEOUS
Linemarking and signs must be installed in accordance with Austroads: AP-G88.

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