SERIES 1100 KERBS, FOOTWAYS AND PAVED AREAS

Transcription

1 MANUAL OF CONTRACT DOCUMENTS FOR HIGHWAY WORKS VOLUME 1 THE SPECIFICATION FOR HIGHWAY WORKS SERIES 1100 KERBS, FOOTWAYS AND PAVED AREAS Contents Clause Title Page 1100 (02/17) General 2 #1101 Precast Concrete Kerbs, Channels, Edgings and Quadrants (11/04) In-Situ Asphalt Kerbs (11/04) Freestanding In-Situ Concrete Kerbs, Channels and Edge Details (05/01) Footways and Paved Areas (Precast Concrete Flags and Natural Stone Slabs) (11/04) Footways and Paved Areas (Flexible Surfacing) (11/04) Footways and Paved Areas (In-Situ Concrete) Footways and Paved Areas (Concrete Block Paving) Footways and Paved Areas (Clay Pavers) (11/04) Grass Concrete Paving (05/01) Access Steps 4 NATIONAL ALTERATIONS OF THE OVERSEEING ORGANISATIONS OF SCOTLAND, WALES AND NORTHERN IRELAND Clause Title Page 1101NI Precast Concrete Kerbs, Channels, Edgings and Quadrants N1F # denotes a Clause or Sample Appendix which has a substitute National Clause or Sample Appendix for one or more of the Overseeing Organisations of Scotland, Wales or Northern Ireland. Amendment February

2 Volume 1 Series 1100 Specification for Highway Works KERBS, FOOTWAYS AND PAVED AREAS 1100 (02/17) General 1 (02/17) This Series is part of the Specification for Highway Works. Whilst this Series is particularly relevant to the subject matter in its title it must be read in conjunction with the general requirements in Series 000 and 100 and with all other Series relevant to the specification for the particular works to be undertaken. #1101 Precast Concrete Kerbs, Channels, Edgings and Quadrants 1 (05/06) Except where otherwise specified in this Clause, precast concrete kerbs, channels, edgings and quadrants shall conform to BS EN 1340 and their dimensions, type designations and performances and classes shall be as described in this Clause and Appendix 11/1. They shall be laid and bedded in accordance with BS on a mortar bed on a concrete pavement slab, a base or a C6/8 or ST1 in accordance with BS concrete foundation. The mortar bed may be omitted if units are bedded onto a concrete slab or foundation that is still plastic. All precast units laid on a mortar bed or bedded onto plastic concrete shall be backed with a strength class C6/8 or ST1 concrete in accordance with BS (11/06) Precast concrete kerbs, which are to be bonded to the pavement surface, shall conform to BS EN The bonding materials and methods of bonding shall be to the manufacturer s recommendations for this specific application. Bonded kerbs shall not be less than 100 mm in width at the base, their height shall not exceed their width and they shall be bonded over their full width. Kerbs shall be precast to the dimensions described in Appendix 11/1. The clear distance between unsupported pavement edge and back of kerb shall be not less than 100 mm. The bending strength of units shall be established by testing in accordance with BS EN 1340 and shall not be less than class 2 in Table 3 of BS EN Units shall be installed in accordance with the manufacturer s instructions. They shall be bonded to the pavement surface with a resilient adhesive compatible with the pavement materials and be capable of withstanding a static push-off load of 10 kn/m applied parallel to the pavement surface at right angles to the kerb. 3 Joints shall be provided in kerbs, channels, edgings and backing, which are laid on or adjacent to a concrete pavement to coincide with the pavement transverse contraction, warping and expansion joints. The joints shall be the same width as the joint sealing grooves of the pavement and shall be caulked and sealed as described in Clauses 1016 and Concrete foundations to kerbs, channels and edgings laid adjacent to a concrete pavement shall be provided with joint filler board complying with Clause 1015 placed vertically through the full extent of the concrete foundation at positions coinciding with the pavement joints. At expansion joints in bridge decks, the kerb joints shall be as described in Appendix 11/1. Where the details of bridge expansion joints are proposed by the Contractor, such details shall include the intended treatment at kerbs and footways. 4 (11/04) For curves of radius 12 m or less, kerbs of appropriate radius shall be used as per BS EN The surface level of units of kerb, channel, edging and quadrant shall not deviate from the design level ± 6 mm, nor shall the longitudinal surface regularity deviate more than 3 mm in 3 m when checked with a 3 m straight edge. Horizontal alignment shall comply with Clause (11/04) In-Situ Asphalt Kerbs 1 (11/04) The materials for, and making and placing of in-situ asphalt kerbs shall comply with the recommendations of BS In addition, a tack coat shall be used and they shall be laid by a machine capable of producing a dense, smooth-surfaced kerb to true line and level. 2 Kerbs shall be constructed to the dimensions described in Appendix 11/1. 3 Vertical expansion and contraction joints shall be formed in kerbs laid on unreinforced concrete slabs and jointed reinforced concrete slabs to coincide with the pavement transverse expansion and contraction joints. All joints shall be sealed in compliance with Clauses 1016 and (11/04) Freestanding In-Situ Concrete Kerbs, Channels and Edge Details 1 (11/04) Freestanding in-situ concrete kerbs, channels and edge details shall comply with the recommendations of BS 5931 except where otherwise specified in this Clause. They shall be laid by a machine capable of forming dense kerbs or surface water channels or edge details with regular sides, arrises and chamfers, finished to a fine surface free from blow holes and dragging and constructed to the dimensions described in Appendix 11/1. Amendment February

3 Volume 1 Series 1100 Specification for Highway Works For kerbs, channels and edge details: (i) Constructed before the adjacent road pavement surface, the surface level adjacent to the future road surface shall not deviate from the design level by more than ±5 mm. (ii) Constructed after the adjacent road pavement surface, the surface level shall not deviate from the finished level of the adjacent pavement surface by more than mm. The longitudinal surface regularity shall not deviate by more than 5 mm in 3 m when measured with a 3 m straight edge. 2 (11/04) The concrete shall be a strength class C28/35 to BS and air-entrained in accordance with BS Coarse aggregate used in kerbs and channels shall be partially crushed or crushed materials. 3 The concrete shall be cured by one of the methods specified in Clause 1027 unless otherwise described in Appendix 11/1. 4 (11/04) Kerbs, channels and edge details shall be firmly secured to the surface on which they are laid. Vertical expansion and contraction joints shall be formed in kerbs, channels and edge details laid on, integral with or adjacent to unreinforced concrete slabs and jointed reinforced concrete slabs to coincide with the pavement transverse expansion, warping and contraction joints. Joints may be omitted from channels cast integral with a CRCP concrete pavement. Vertical expansion joints at 40 m spacings and intermediate contraction joints at 5 m spacings shall be formed in kerbs, channels and edge details laid on or adjacent to other types of concrete and flexible pavement. Expansion joints may be replaced by contraction joints and installed in accordance with the manufacturer s instructions during the summer period from 1 April until 31 October. All joints in kerbs, channels and edge details shall be sealed in compliance with Clauses 1016 and (05/01) Footways and Paved Areas (Precast Concrete Flags and Natural Stone Slabs) 1 (11/04) Precast concrete flags shall conform to BS EN Natural stone slabs shall conform to BS EN Type designations, thicknesses and performances and classes shall be as described in Appendix 11/1. 2 (11/04) Precast concrete flags and natural stone slabs shall be laid in accordance with BS , to the required cross falls with a bond as described in Appendix 11/1 and with joints at right angles to the kerb. Flags and natural stone slabs shall be bedded on a layer of mortar not less than 10 mm and not more than 40 mm thick. Where permitted in Appendix 11/1, flags and natural stone slabs 450 mm x 450 mm and smaller may be laid on a layer of sand comforming to BS EN designation 0/4 mm, 25 mm ± 5 mm thick. Joints to be filled with sand conforming to BS EN designation 0/2. 3 (05/01) On circular work where the radius is 12 m or less all flags and natural stone slabs shall be radially cut on both edges to the required line. 4 (11/04) The laying course shall be laid on subbase composed of one of the materials complying with Clause 803, 804, 805, 806, 821, 822 or 823, laid and compacted to Clause 802 or 813 as appropriate and to the thickness described in Appendix 11/ (11/04) Footways and Paved Areas (Flexible Surfacing) 1 (08/08) Flexible surfacing and subbase for footways and paved areas shall be constructed using the materials and layer thicknesses described in Appendix 11/1. 2 (08/08) Bituminous mixtures used in flexible surfacing shall be made in accordance with BS EN 13108, the detailed requirements from the example specifications in BS PD6691 and Clause (08/08) Flexible surfacing shall be laid and compacted in accordance with BS Subbase shall be composed of an unbound mixture conforming to Clause 803, 804, 805, 806, or 807 or a cement bound granular mixture conforming to Clause 821, 822 or 823. Subbase shall be laid and compacted to Clause 802 or 813, as appropriate (11/04) Footways and Paved Areas (In-Situ Concrete) 1 (11/04) In-situ concrete for footways and paved areas shall be made, laid and cured as described in Appendix 11/1. The grade of concrete and surface finish shall be as described in Appendix 11/1. 2 (11/04) In-situ concrete shall be laid to true levels and crossfalls, and be of the thickness described in Appendix 11/1. 3 (11/04) In-situ concrete shall be laid on a subbase composed of one of the materials conforming to Clause 803, 804, 805, 806, 821, 822 or 823, laid and compacted in compliance with Clause 802 or 813 as appropriate, and to the thickness described in Appendix 11/1. Amendment August

4 Volume 1 Series 1100 Specification for Highway Works 1107 Footways and Paved Areas (Concrete Block Paving) 1 (11/04) Precast concrete paving blocks shall be chamfered and shall comform to BS EN 1338 and the shapes, dimensions, colours and performances and classess described in Appendix 11/1. 2 (11/04) Precast paving blocks shall be laid in accordance with BS , except that the subbase shall be one of the materials permitted in sub-clause The layout of blocks and details at edges, chamber covers, gullies and other openings shall be as described in Appendix 11/ Footways and Paved Areas (Clay Pavers) 1 (11/04) Clay pavers shall conform to BS EN 1344 with chamfers. The shapes, dimensions, colours and performances and other required classes of clay pavers shall be as described in Appendix 11/1. 2 (11/04) Clay pavers shall be laid in accordance with BS , except that the subbase shall be one of the materials permitted in subclause The layout of pavers and details at edges, chamber covers, gullies and other openings shall be as described in Appendix 11/ (11/04) Grass Concrete Paving 1 (11/04) Grass concrete paving shall consist of a reinforced perforated in-situ concrete slab or a precast panel system as specified in Appendix 11/1 and in the locations shown on the Drawings. 2 (11/04) In-situ grass concrete paving shall be cast and cured as described in Appendix 11/1. The strength class of concrete and surface finish shall be as described in Appendix 11/1. 3 (11/04) Perforations shall be formed in in-situ grass concrete paving as described in Appendix 11/1. 4 Concrete panels shall conform to the shape, dimensions and colour described in Appendix 11/1. 5 (11/04) Concrete used shall have compressive strength class of 28/35 and panels when tested in accordance with BS EN 1339, the characteristic bending strength shall be class 3 to Table 5 of BS EN The water absorption when tested in accordance with BS EN 1339 shall be class 2 of Table The layout of panels and details at edges, chamber covers, gullies and other openings shall be as described in Appendix 11/1. 7 (11/04) Grass concrete paving shall be laid to true levels and crossfalls, and be of the thickness described in Appendix 11/1. 8 (11/04) Grass concrete paving shall be laid on a bed of Type 1 unbound mixtures conforming to Clause 803 laid and compacted in accordance with Clause 802 and to the thickness described in Appendix 11/1. In addition panels shall be bedded on a layer of sand conforming to BS EN to the thickness specified in Appendix 11/1. 9 Perforations shall be filled with friable soil free from deleterious matter or with other material as described in Appendix 11/1, levelled off 30 mm below the top surface, sown with grass seed as described in Appendix 11/1, covered with a layer of fine soil and levelled. The seed shall be sown while soil is still loose after filling (02/17) Access Steps 1 (02/17) The Contractor shall provide the access steps identified in contract specific Appendix 11/2 and where identified in contract specific Appendix 1/10 shall undertake the design of the access steps or elements thereof. The access steps shall comply with the requirements of BS EN ISO and BS EN ISO , contract specific Appendix 11/2 and the performance requirements described hereafter. Where required in contract specific Appendix 11/2 the steps shall be installed in accordance with HCD drawing MCX 0138 sheet numbers 1 and 2. For the purpose of this Clause: (i) The term access steps shall mean access steps provided for highway maintenance purposes to communication cabinets and other roadside items and shall include landings and guardrails. (ii) The term Machinery referred to under BS EN ISO and BS EN ISO shall mean communication cabinets and other roadside items. 2 (02/17) Where required by contract specific Appendix 1/4, working and fabrication drawings indicating material and fabrication of components and fittings shall be submitted to the Overseeing Organisation for approval. 3 (02/17) The alignment and location for access steps shall enable the safe access to and egress from any communication cabinet and other roadside items. The steps shall be located, where possible, such that they will not require removal for access to services or supplies including motorway communication systems. Amendment February

5 Volume 1 Series 1100 Specification for Highway Works (02/17) Durability 4 (02/17) The access steps must achieve, as a minimum, a serviceable life as detailed in contract specific Appendix 11/2. The serviceable life shall be obtained without the requirement for any maintenance other than that resulting from accidental damage and routine maintenance. (02/17) Materials 5 (02/17) Material for access steps shall conform to BS EN ISO section 4, requirements stated in contract specific 11/2 and the following: (i) All components of the steps shall be resistant to theft, tampering and fire. (ii) Where two or more materials are used they shall be compatible and include measures to avoid galvanic action and avoid differential movement. Materials shall be able to resist corrosion provoked by the surrounding atmosphere and ground conditions to achieve its serviceable life. (iii) Unless otherwise stated in contract specific Appendix 11/2 materials listed in Table 11/1 shall conform to the requirements listed in Table 11/1 and shall comply with the standards and/or Clauses listed. Where materials are covered by the Construction Products Regulation the Declaration of Performance and CE marking shall demonstrate that the product meets or exceeds the performance requirements of the specification. Table 11/1 (02/17) Access Step Materials Material Requirements General Detailed Paving slabs or flags BS EN 1339 or BS EN 1341 Laid in accordance with BS Concrete flags shall be Class 2 or Class 3 as detailed in Annex NA of BS EN 1339, and shall have a minimum breaking strength of 3.2 MPa. Natural stone slabs shall have a minimum Class of 2 and minimum breaking load of 3.5 kn Flags or slabs to be bedded on a layer of mortar of 10 mm to 40 mm thick, or sand 25mm ± 5 mm. Engineering bricks BS EN Class B Compressive strength 75 N/mm2 Water absorption (% by mass) 7.0 Freeze/thaw resistance category F2 Active soluble salts content category S2 Mortar BS EN BS EN Durability designation M or S Bedding sand BS EN Designation 0/4 mm Precast concrete edgings BS EN 1340 Concrete Landings Series 1700 BS EN 8500 Exposure class: reinforced XC3 or XC4, XD3, XF2 unreinforced XF2 Minimum strength class C25/30 or greater Maximum aggregate size 20mm Ancillary concrete BS 8500 Bedding and backing to precast concrete edgings ST2 Backing to steps ST2 Fill material Series 600, Table 6/1 Class 1 General Fill Galvanised steel guardrails BS EN Amendment February

6 Volume 1 Series 1100 Specification for Highway Works (02/17) Particular Access Step Criteria 6 (02/17) Unless otherwise stated in contract specific Appendix 11/2 the design of access steps shall conform to the following: (i) (ii) The steps shall have a minimum clear width of 800mm. Subject to the requirements of paragraph (vi) below, no part of the steps, excluding guardrails, shall protrude more than the step rise height plus 50mm above or below the adjacent finished ground level, measured along a line at right angles to the embankment or cutting slope except where necessary to accommodate a landing. (iii) In accordance with BS EN ISO the steps shall have at least one guardrail unless the width of the steps is greater or equal to 1200mm when two guardrails are required. Where one guardrail is to be used it shall be located on the right hand side going up the steps. (iv) The steps shall have a rise and going which achieves the safety requirements formulae of BS EN ISO Steps with an angle of pitch greater than 45 degrees are not permitted. (v) The step going shall maintain the asconstructed finished level for the serviceable life of the steps. (vi) Steps with solid edging shall have edging laid at the slope of batter with the top edge set slightly above but not more than 50mm above adjacent ground level measured perpendicular to the slope. The top edge shall also be 50mm minimum above the leading edge of the step going measured perpendicular to the slope. (vii) There shall be a change in horizontal direction of not less than 30 degrees after not more than 16 steps or a climbing height of 6m, whichever is the lesser, by means of a landing. (viii) Steps shall have adequate drainage for their safe use. There shall be no areas of standing water on the steps. (ix) Open steps where a solid riser is not provided are not acceptable. The step going and landings shall also be solid. (x) Kneerails are required on landings and steps. (02/17) Environment 7 (02/17) The access steps shall conform to the environmental requirements stated in contract specific Appendix 11/2. The access steps shall be visually acceptable, have a non-intrusive appearance and be suitable for the location. The alignment of the steps shall minimise the impact on the environmental assets in the soft estate. (02/17) Geotechnical Requirements 8 (02/17) Where required in contract specific Appendix 11/2 the Contractor shall determine the geotechnical classification of the works in accordance with HD 22 Managing Geotechnical Risk (DMRB 4.1.2) and agree the classification with the Overseeing Organisation in accordance with HD 22. (02/17) Records 9 (02/17) The Contractor shall provide as-built drawings of the access steps to the Overseeing Organisation. These shall include details of materials, fabrication components and fittings. Amendment February F

7 Volume 1 Series 1100 Specification for Highway Works NATIONAL ALTERATIONS OF THE OVERSEEING ORGANISATION OF NORTHERN IRELAND 1101NI Precast Concrete Kerbs, Channels, Edgings and Quadrants 1 (05/06) Except where otherwise specified in this Clause, precast concrete kerbs, channels, edgings and quadrants shall conform to BS EN 1340 and their dimensions, type designations and performances and classes shall be as described in this Clause and Appendix 11/1. They shall be laid and bedded in accordance with BS on a mortar bed on a concrete pavement slab, a base or a strength class C6/8 or ST1 in accordance with BS concrete foundation. The mortar bed may be omitted if units are bedded onto a concrete slab or foundation that is still plastic. All precast units laid on a mortar bed or bedded onto plastic concrete shall be backed with a strength class C6/8 or ST1 concrete in accordance with BS (11/06) Precast concrete kerbs which are to be bonded to the pavement surface shall conform to BS EN The bonding materials and methods of bonding shall be to the manufacturer s recommendations for this specific application. Bonded kerbs shall not be less than 100 mm in width at the base, their height shall not exceed their width and they shall be bonded over their full width. Kerbs shall be precast to the dimensions described in Appendix 11/1. The clear distance between unsupported pavement edge and back of kerb shall be not less than 100 mm. The bending strength of units shall be established by testing in accordance with BS EN 1340 and shall not be less than class 2 in Table 3 of BS EN Units shall be installed in accordance with the manufacturer s instructions. They shall be bonded to the pavement surface with a resilient adhesive compatible with the pavement materials and be capable of withstanding a static push-off load of 10 kn/m applied parallel to the pavement surface at right angles to the kerb. through the full extent of the concrete foundation at positions coinciding with the pavement joints. At expansion joints in bridge decks, the kerb joints shall be as described in Appendix 11/1. Where the details of bridge expansion joints are proposed by the Contractor, such details shall include the intended treatment at kerbs and footways. 4 (11/04) For radii of 12 m or less kerbs of appropriate radius shall be used as per BS EN Where radii kerbs are not available, straight kerbs shall be used. For radii of 3 m to 12 m, kerbs with a maximum length of 450 mm shall be used and for radii less than 3 m, kerbs with a maximum length of 300 mm shall be used. The ends of straight kerbs shall be splayed where necessary to form the required radius. 5 The surface level of units of kerb, channel, edging and quadrant shall not deviate from the design level ± 6 mm, nor shall the longitudinal surface regularity deviate more than 3 mm in 3 m when checked with a 3 m straight edge. Horizontal alignment shall comply with Clause Joints shall be provided in kerbs, channels, edgings and backing, which are laid on or adjacent to a concrete pavement to coincide with the pavement transverse contraction, warping and expansion joints. The joints shall be the same width as the joint sealing grooves of the pavement and shall be caulked and sealed as described in Clauses 1016 and Concrete foundations to kerbs, channels and edgings laid adjacent to a concrete pavement shall be provided with joint filler board complying with Clause 1015 placed vertically Amendment November 2006 N1F

8 MANUAL OF CONTRACT DOCUMENTS FOR HIGHWAY WORKS VOLUME 2 NOTES FOR GUIDANCE ON THE SPECIFICATION FOR HIGHWAY WORKS SERIES NG 1100 KERBS, FOOTWAYS AND PAVED AREAS Contents Clause Title Page NG 1101 General 2 NG 1103 (11/04) Freestanding In-Situ Concrete Kerbs, Channels and Edge Details 2 NG 1109 (11/04) Grass Concrete Paving 2 #NG 1110 (02/17) Access Steps 2 NG (05/01) Sample Appendices A1 (05/01) NATIONAL ALTERATIONS OF THE OVERSEEING ORGANISATIONS OF SCOTLAND, WALES AND NORTHERN IRELAND Wales Clause Title Page NG 1110 NAW Access Steps W1F NG Sample Appendix WA1F Amendment February

9 Volume 2 Notes for Guidance on the Specification for Highways Works Series NG1100 KERBS, FOOTWAYS AND PAVED AREAS NG 1101 General 1 (11/04) The choice of placing the kerb can be either on the surface of, or adjoining the edge of, pavements particularly when used as a drainage detail for concrete pavements. It should also include the choice of laying in-situ kerbs and edgings either in concrete or asphalt as there are small machines available for this purpose. 2 Care should be taken in preparing detailed drawings to ensure good drainage from the carriageway construction either through or under the kerb foundation. 3 (11/04) Even if concrete pavement is not provided with expansion joints, adjacent in situ concrete edge details such as combined marginal strips and drainage channels should be provided with expansion joints, and should coincide with any joints formed in adjacent slabs. 4 (11/04) 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. 5 (11/04) 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. 6 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. 7 The construction adopted for cycle tracks should be one or more of those given for footways and paved areas. NG 1103 (11/04) Freestanding In-Situ Concrete Kerbs, Channels and Edge Details 1 (11/04) 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. Uncrushed aggregate may be used for surface water channels of 400mm 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 (11/04) Grass Concrete Paving 1 (11/04) Grass concrete paving may be considered for parking areas, hard standings and accesses. 2 (11/04) In-situ reinforced grass concrete 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. 3 Details of paving systems should be described in Appendix 11/1. #NG 1110 (02/17) Access Steps 1 (02/17) Access steps are normally to be provided to communications cabinets or other roadside equipment where necessary to provide safe access for highway maintenance. The specification in Clause 1110 is for steps for these purposes and not for other uses. Details of access steps requirements should be given in contract specific Appendix 11/2. The requirements should be stated in performance terms rather than prescriptive details to allow the Contractor suitable options for the provision of the steps. HCD drawing MCX 0138 should only be specified when considered necessary. The steps can be Contractor designed or not. Where the Contractor is undertaking the design of the steps Amendment February

10 Volume 2 Notes for Guidance on the Specification for Highways Works Series NG1100 contract specific Appendices 1/10 and 11/2 should be used to give any specific design requirements. 2 (02/17) The design process should include consideration of the following elements. (i) The location and alignment of the steps. (ii) The width of the steps, this should be 800mm as a minimum. (iii) Edge details and level of the steps with respect to surrounding ground level. (iv) Guardrails at least one guardrail should be provided, where the width of the steps is greater than 1.2m a second should be provided, the risk assessment should consider what to provide for widths up to 1.2m. (v) The steps are required to have a rise and going which achieves the safety requirements formulae of BS EN ISO , if the ground conditions do not allow this the risk assessment should consider what should be achieved. (vi) The angle of pitch of the steps should be between 18 and 38. Should an angle of pitch less than 18 be required, the risk assessment should determine whether steps, ramps or a combination are appropriate. Should an angle of pitch between 38 and 45 be required the risk assessment should determine whether steps are appropriate. (vii) The number of kneerails required and the requirement for toe plates on landings. (viii) The need for a pedestrian guardrail between the steps and the road or other hazard to restrict direct egress from the steps onto the carriageway. 4 (02/17) Table 11/1 gives some material requirements, these are minimum default values and should be supplemented with site specific requirements in contract specific Appendix 11/2. The compiler should include site specific requirements for each material to be used and reference relevant Clauses, or numbered appendices, that are not already referenced in Table 11/1. For example, for concrete the type of specification should be determined, i.e. designed, prescribed or standardised prescribed, along with the basic and other requirements such as concrete designation, maximum aggregate size, consistence class, compressive strength, and other limiting values for composition. Specific relevant Clauses of Series 1700 should be identified and referenced. Where details may be given in Series 1700 contract specific Appendices these should be crossreferenced in contract specific Appendix 11/2. Where the Contractor is to design the access steps site details should be stated to inform the design and set any other relevant minimum requirements. There should also be consideration of the need to provide a road restraint system between the steps and the road. For road restraint system requirements see Series (02/17) Contract specific Appendix 11/2 should also include details of performance requirements including the required serviceable life of the steps, the loading requirements and any environmental or geotechnical requirements. The specified serviceable life of the steps should be the same as that identified for the equipment to which the steps are providing access. The loading requirements should be identified for the specific use of the steps and be within the limits stated in BS EN ISO section 4.7. Amendment February F

11 Volume 2 Notes for Guidance on the Specification for Highways Works Series NG1100 NG SAMPLE APPENDIX 11/1: KERBS FOOTWAYS AND PAVED AREAS [Note to compiler: This should include:] 1 (11/04) Dimensions, type designations and performances and classes [see clause 5.3 and the National Annex NA of BS EN 1340] of precast concrete kerbs, channels, edgings and quadrants [1101.1]. 2 Dimensions of precast concrete kerbs to be bonded to the pavement surface [1101.2]. 3 Details of kerb joints at bridge expansion joints designed by the Overseeing Organisation [1101.3]. 4 (11/04) Dimensions of in-situ asphalt kerbing [see MCHW 3 (HCD) Drawing Nos. B9 and B10] or in-situ concrete kerbing, channels and edgings [1102.2, ]. 5 Concrete curing requirements if different from Clause 1027 [1103.3]. 6 (11/04) Type designation, thickness and performances and classes of precast concrete flags or natural stone flags [1104.1]. [For precast concrete flags see clause 5.3, the National Annex NA of BS EN For natural stone flags, see relevant clauses and the National Annex NA of BS EN 1341.] 7 (05/01) Details of required bond for flags or natural stone flags [1104.2]. 8 (05/01) Whether alternative bed for flags or natural stone flags, less than 450mm x 450mm, is permitted [1104.2]. 9 Details of flexible surfacing materials to be used [1105.1]. 10 (11/04) Required thickness of surfacing and subbase [1104, 1105, 1106, , ] [or where appropriate the groups of permitted alternative materials]. 11 (11/04) Requirements for laying and curing in-situ concrete [1106.1, ]. 12 (11/04) Required finish and strength class of in-situ concrete [1106.1, ]. 13 (11/04) Requirements for shapes, dimensions, colours and performances and classes of precast concrete paving blocks [1107.1] [see clause 5.3 and the National Annex NA of BS EN 1338]. 14 (11/04) Requirements for shapes, dimensions, colours and performances and classes of clay pavers [1108.1] [see clause 4 and the National Annex NA of BS EN 1344]. 15 Block or paver layout details [1107.3, , ]. 16 Requirements for grass/concrete paving [1109.1]. 17 (11/04) Requirements for perforations in in-situ grass/concrete paving [1109.3]. 18 Requirements for shapes, dimensions and colours of precast grass/concrete panels [1109.4]. 19 Required thickness of sand bed for grass/concrete panels [1109.8]. 20 Requirements for fill material to perforations of grass/concrete paving [1109.9]. 21 Requirements for grass seed mix to grass/concrete paving [1109.9]. Amendment November 2004 A1

12 Volume 2 Notes for Guidance on the Specification for Highways Works Series NG1100 (02/17) #NG SAMPLE CONTRACT SPECIFIC APPENDIX 11/2: ACCESS STEPS [Note to compiler: include the following here as necessary] 1 (02/17) Requirement for access steps, locations, cross reference to drawings as appropriate, use of HCD drawing MCX (02/17) Design requirements for Contractor design. [Details must also be included in contract specific Appendix 1/10. The requirement for drawings to be submitted must be included in contract specific Appendix 1/4.] 3 (02/17) Loading requirements [NG and NG ] 4 (02/17) Required serviceable life of access steps [1110.4] 5 (02/17) Environmental requirements. [1110.7] 6 (02/17) Geotechnical requirements. [1110.8] 7 (02/17) Material requirements [ and NG ] Amendment February 2017 A2F

13 Volume 2 Notes for Guidance on the Specification for Highways Works Series NG1100 (05/01) NATIONAL ALTERATIONS OF THE OVERSEEING ORGANISATION OF WALES NG 1110 NAW Access Steps 1 (02/03) Access steps to feeder pillars, communication cabinets, traffic counter cabinets, ice prediction installations and the like should conform to the requirements of the Welsh Assembly Government. Amendment February 2003 W1F

14 Volume 2 Notes for Guidance on the Specification for Highways Works Series NG1100 NG SAMPLE APPENDIX 11/2 NAW: (05/01) ACCESS STEPS Special Requirements for Access Steps [1110.1] [Note to compiler: List below any special requirements, cross-referring to Drawings as appropriate] Amendment May 2001 WA1F