Notes for Guidance on the Specification for Road Works Series NG Kerbs, Footways and Paved Areas

Transcription

1 Notes for Guidance on the Specification for Road Works Series NG Kerbs, Footways and Paved Areas CC-GSW March 2011 CC Construction & Commissioning Standards

2 TRANSPORT INFRASTRUCTURE IRELAND (TII) PUBLICATIONS About TII Transport Infrastructure Ireland (TII) is responsible for managing and improving the country s national road and light rail networks. About TII Publications TII maintains an online suite of technical publications, which is managed through the TII Publications website. The contents of TII Publications is clearly split into Standards and Technical documentation. All documentation for implementation on TII schemes is collectively referred to as TII Publications (Standards), and all other documentation within the system is collectively referred to as TII Publications (Technical). This system replaces the NRA Design Manual for Roads and Bridges (NRA DMRB) and the NRA Manual of Contract Documents for Road Works (NRA MCDRW). Document Attributes Each document within TII Publications has a range of attributes associated with it, which allows for efficient access and retrieval of the document from the website. These attributes are also contained on the inside cover of each current document, for reference. For migration of documents from the NRA and RPA to the new system, each current document was assigned with new outer front and rear covers. Apart from the covers, and inside cover pages, the documents contain the same information as previously within the NRA or RPA systems, including historical references such as those contained within NRA DMRB and NRA MCDRW. Document Attributes TII Publication Title TII Publication Number Notes for Guidance on the Specification for Road Works Series NG CC-GSW Activity Stream Document Number Construction & Standards Document Set Commissioning (CC) Guidance on Specification for Publication Date March 2011 Works (GSW) Historical Series NG 1100 Reference NRA DMRB and MCDRW References For all documents that existed within the NRA DMRB or the NRA MCDRW prior to the launch of TII Publications, the NRA document reference used previously is listed above under historical reference. The TII Publication Number also shown above now supersedes this historical reference. All historical references within this document are deemed to be replaced by the TII Publication Number. For the equivalent TII Publication Number for all other historical references contained within this document, please refer to the TII Publications website.

3 Volume 2 Series NG 1100 Notes for Guidance on the Specification for Road Works KERBS, FOOTWAYS AND PAVED AREAS Contents Clause Title Page NG General... 2 NG 1103 In Situ Concrete Kerbs, Channels and Edge Details... 2 NG 1109 Footways and Paved Areas (Cellular Grass Paving Systems)... 2 NG Sample Appendices... 3 March

4 Volume 2 Series NG 1100 Notes for Guidance on the Specification for Road Works NG General 1 Care should be taken in preparing detailed drawings to ensure good drainage from the carriageway construction either through or under the kerb foundation. 2 In concrete pavements, adjacent in situ concrete edge details such as combined marginal strips and drainage channels should be provided with expansion joints, and these should coincide with any joints formed in adjacent slabs. 3 The construction adopted for footways will depend very much upon the availability of local materials and local conditions. Where appropriate and to allow economy, the use of groups of permitted alternatives should be described in Appendix 11/1. 4 For footways which are known to be subjected to vehicle overrun the use of smaller and thicker paving flags laid on a thin layer of sand may be considered. Other alternatives would be concrete block paving, clay pavers, in situ concrete, or for flexible footways increased construction thickness and the use of denser surfacing materials. 5 Concrete block paving and clay pavers may be considered in certain low speed traffic situations, e.g. service areas, and lay-bys, because of their resistance to oil spillage and to deformation due to wheel loads. The block or paver layout and other details should be described in Appendix 11/1 wherever possible and incorporate whole units immediately adjacent to the edge of a carriageway or hard strip and avoid trimming of units to less than one third of their surface area. NG 1103 In Situ Concrete Kerbs, Channels and Edge Details 1 Experience suggests that for the in situ construction of relatively high drainage channels by slip-forming or extrusion techniques, the use of crushed or partially crushed aggregate will ensure a more consistent and stable profile. The Employers Representative may relax this requirement for surface water channels of 400 mm or less in height where past experience in the use of a particular aggregate, or the result of trials, demonstrate that a satisfactory profile can be achieved. 2 The precise level of concrete workability will depend on the type of construction plant used, for example: Extrusion auger (small kerbs). Ram compaction (small kerbs, kerbs, channels). Slip-form (kerbs, channels). NG 1109 Footways and Paved Areas (Cellular Grass Paving Systems) 1 Cellular grass paving systems may be considered for parking areas, hard standings, emergency median crossings and accesses. 2 In-situ reinforced cellular grass paving may be advantageous where heavy goods vehicles or vehicles with high point loadings are anticipated or where poor ground may result in differential settlement between panels. 6 The construction adopted for cycle tracks should be one of those given for footways and paved areas. 3 Details of cellular grass paving systems should be described in Appendix 11/1. March

5 Volume 2 Series NG 1100 Notes for Guidance on the Specification for Road Works NG Sample Appendices NG SAMPLE APPENDIX 11/1: KERBS, FOOTWAYS AND PAVED AREAS [Note to compiler: This should include:] 1 Dimensions, type designations and performances and classes [see Section 5 of IS EN 1340] of precast concrete kerbs, channels, edgings and quadrants [1101.1, ] 2 Details of kerb joints at bridge expansion joints designed by the Specialist Representative for the design [1101.3]. 3 Dimensions of in situ asphalt or concrete kerbing [1102.2, ]. 4 Concrete curing requirements if different from Series Type designation, thickness and performances and classes of precast concrete flags or natural stone flags [1104.1]. [For precast concrete flags see Section 5 of IS EN For natural stone flags, see relevant clauses of IS EN 1341.] 6 Details of required bond for flags or natural stone flags [1104.2]. 7 Whether alternative bed for flags or natural stone flags, less than 450mm x 450mm, is permitted [1104.2] 8 Details of flexible surfacing materials to be used [If different from Clause 1105]. 9 Required thickness of surfacing and sub-base [If different from sub-clauses , , or , e.g. where vehicular access is to be provided]. 10 Requirements for laying and curing in situ concrete [If different from sub-clause ]. 11 Required finish and grade of in situ concrete [If different from sub-clause ]. 12 Requirements for shapes, dimensions and colours of precast concrete paving blocks [1107.1]. 13 Requirements for shapes, dimensions, colours and performances and classes of clay pavers [1108.1] [see Section 4 of IS EN 1344]. 14 Block or paver layout details [1107.3, , ]. 15 Requirements for cellular grass paving systems [1109.1, , ]. 16 Requirements for perforations in in-situ cellular grass paving systems [1109.4]. 17 Requirements for shapes, dimensions and colours of concrete cellular grass paving systems [1109.5]. 18 Material requirement and thickness of sand bed for cellular grass paving systems [1109.9]. 19 Requirements for fill material to perforations of cellular grass paving systems [ ]. 20 Requirements for grass seed mix to cellular grass paving systems [ ]. March

6 Volume 2 Series NG 1100 Notes for Guidance on the Specification for Road Works NG SAMPLE APPENDIX 11/2: ACCESS STEPS [Note to complier: Include here, as appropriate;] General [1110.1] 1 Reference should be made to HCD MCX 0138 for layouts of access steps to feeder pillars, communication cabinets, ice prediction installations and the like. NG SAMPLE APPENDIX 11/3: KERBS, FOOTWAYS AND PAVED AREAS: NRA ROAD CONSTRUCTION DETAILS Clause No. [Note to Compiler: List the relevant 1100 Series RCD s, ensuring to include those listed below where the scope of works includes either precast or insitu concrete kerbs] & RCD/1100/1 & RCD/1100/2 Road Construction Detail Drg. No. March

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