STEEL REINFORCEMENT SPECIFICATION 822. Copyright MAIN ROADS Western Australia

Transcription

1 SPECIFICATION 822 STEEL REINFORCEMENT Copyright MAIN ROADS Western Australia MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 1 of 14

2 SPECIFICATION 822 STEEL REINFORCEMENT REVISION REGISTER Date Clause Number Description of Revision Authorised By 24 Oct Inclusion of ACRS Certification A/SDSE 11 June 10 Whole document 1 Aug 06 Whole document Complete review no change Complete revision of Issue 1.3 to new format A/SDSE MCP MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 2 of 14

3 CONTENTS Clause Page No GENERAL SCOPE REFERENCES CLEAR COVER REQUIREMENT NOT USED... 4 PRODUCTS AND MATERIALS STANDARDS BENDING AND CUTTING STORAGE CLEANING MECHANICAL SPLICES NOT USED... 6 OPERATIONS FIXING WELDING LAP SPLICES TOLERANCES FOR FIXING NOT USED AS BUILT AND HANDOVER REQUIREMENTS NOT USED CONTRACT SPECIFIC REQUIREMENTS NOT USED MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 3 of 14

4 SPECIFICATION 822 STEEL REINFORCEMENT GENERAL SCOPE 1. The work under this specification consists of the scheduling, supply, delivery and fixing of steel reinforcement to be cast into concrete REFERENCES 1. Australian Standards, MAIN ROADS Western Australia Standards and MAIN ROADS Western Australia Test Methods are referred to in abbreviated form (e.g. AS 1234, MRS or WA 123). For convenience, the full titles are given below: Australian/New Zealand Standards AS/NZS Structural Steel Welding Welding of Reinforcing Steel AS/NZS 4671 Steel Reinforcing Materials CLEAR COVER REQUIREMENT 1. The minimum cover measured from the surface of the concrete to the face of any reinforcing steel shall be as shown on the Drawings NOT USED PRODUCTS AND MATERIALS STANDARDS 1. Reinforcement used in the Works shall comply with the Australian Standards listed in Table Manufacturers and processors of steel reinforcing materials must hold a valid certificate of approval issued by the Australian Certification Authority for Reinforcing Steels Ltd (ACRS). MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 4 of 14

5 TABLE REINFORCEMENT USED IN WORKS Reinforcement Grade 500N Hot Rolled Deformed Steel Reinforcing Bars for Concrete Specification AS/NZS 4671 Reinforcing Wire AS/NZS 4671 Reinforcing Fabric/Welded Mesh Grade 500L AS/NZS BENDING AND CUTTING 1. The Contractor shall prepare reinforcement bending schedules from the Drawings. Schedule 2. Reinforcement shall be accurately cut and bent to the dimensions and shapes shown on the Drawings. All bars shall be bent in accordance with Table unless otherwise detailed on the Drawings. Pin diameters for bends shall be in accordance with Table and hook and cog allowances in accordance with Table Reinforcement partially embedded in concrete shall not be field bent unless it is allowed for on the Drawings. Where field bending is required it shall be carried out by the application of a constant force using a pin diameter as specified in Table Heating of reinforcement shall not be permitted except where indicated on the Drawings and shall then only be carried out in accordance with the following requirements: a) The steel shall be heated uniformly for at least 100 mm each side of the portion to be bent. b) For grade 500 steel the heating shall be controlled such that the temperature does not exceed 450 C and shall be measured with temperature indicating crayons. Steel heated beyond 450 C shall be rejected. c) Grade 250N steel may be heated to a dull cherry red. d) Heated bars shall not be cooled rapidly by quenching or any other means. e) All heating shall be carried out in the presence of the Superintendent. 5. Prior to heating any reinforcement the Contractor shall supply to the Superintendent full details of the proposed heating procedure. HOLD POINT MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 5 of 14

6 STORAGE 1. Reinforcing steel shall be stored above ground level and shall be protected from damage and deterioration CLEANING 1. Reinforcement placed in the Works shall be clean and free from all loose rust and mill-scale and all dirt and grease and all other foreign substances. After being placed in position all reinforcement shall be maintained in a clean condition until it is embedded in the concrete MECHANICAL SPLICES 1. Mechanical splices shall be used only where shown on the Drawings. Alternative mechanical splices to the ones shown on the Drawings may be used provided that they are capable of developing at least 125% of the specified yield strength of the bar and meet the dimensional and clearance requirements shown on the Drawings NOT USED OPERATIONS FIXING 1. Reinforcing steel shall be accurately placed in the positions shown on the Drawings in accordance with the tolerances given in Table The reinforcement shall be secured in position so that it shall not be displaced during the placement of concrete and the Contractor shall ensure that there is no disturbance of the reinforcement in concrete that has already been placed. 3. Reinforcing bars intended to be in contact at points where they cross shall be bound together with 1.6mm annealed soft iron tie wire. Stirrups shall be wired securely to the bars they are intended to restrain so as to form an effective reinforcement cage. 4. All reinforcing steel supported off formwork where the resulting concrete surface will be exposed, shall be supported on special purpose bar spacers approved by the Superintendent. 5. Reinforcement not supported off formwork or where the resulting concrete surface will be concealed may alternatively be supported on concrete blocks or plastic chairs approved by the Superintendent. MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 6 of 14

7 WELDING 1. Welding or tack welding of reinforcement shall not be permitted except where indicated on the Drawings and shall then comply with the following requirements: a) Welding shall be in accordance with AS/NZS b) Welding of grade 500 steel will not be permitted within 75mm of a bend. c) Welds shall not be broken out. 2. Prior to welding any reinforcement, the Contractor shall supply to the Superintendent documentation showing that welders to be employed on the Works are suitably qualified and that the qualification of welding procedures has been verified by testing in accordance with the requirements of AS/NZS HOLD POINT LAP SPLICES 1. Reinforcement shall only be spliced at locations shown on the Drawings. 2. The minimum length of lap shall be as indicated on the Drawings. 3. Welded steel wire fabric shall be lapped as detailed on the Drawings and where not detailed shall overlap by at least one complete mesh on all sides such that the end cross wire of one sheet overlaps with the second end wire of the adjacent sheet. Loose bars shall not be used in conjunction with fabric reinforcement except where shown on the Drawings. Loose small pieces of fabric shall only be used where they are essential for fitting into small confined parts of the Works TOLERANCES FOR FIXING 1. The tolerances for fixing of reinforcement are given in Table MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 7 of 14

8 Condition Nominal length Nominal size Tolerance or Dimension or Diameter of (mm) L (mm) Bar (mm) On each overall dimension, or on the overall dimension of each straight portion, or on that offset dimension, controlled by concrete cover at both ends for bars other than fitments. Up to 600 Up to Up to 600 Over Over 600 Up to Over 600 Over On that overall dimension controlled by cover at both ends, for fitments (ties, stirrups, helices, hoops, and the like) only. Up to 600 Up to Up to 600 Over Over 600 Up to Over 600 Over Up to 600 Up to Up to to Over 600 Up to Any Length Over On the overall dimension, or on the overall dimension of each straight portion, or on that offset dimension, controlled by concrete cover at one end only or at neither end. Up to 600 Up to Up to to Over 600 Up to Any Length Over Any length Any size including allowances for laps. On the overall offset dimension of a cranked column bar Any offset Up to On the deviation from square measured in relation to Any bar 24 and over the end 300mm of the sawn or machined end of a length. a straight bar intended for use as an end bearing TABLE FABRICATION MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 8 of 14

9 Case Material Diameter a) Reinforcement, other than that specified in items (b), (c) or (d) below. All deformed bars Fabric 5 d b 3 d b b) Fitments Wire and fabric Grade 230R bars All deformed bars 3 d b 3 d b 4 d b c) Reinforcement in which the bend is intended to be subsequently straightened or re-bent d) Reinforcement which is epoxy-coated or galvanised, either before or after bending Size 16 mm or less Size 20 mm or 24 mm Size 28 mm or greater Size 16 mm or less Size 20 mm or greater 4 d b 5 d b 6 d b 5 d b 8 d b NOTE: d b is the diameter of the bar being bent. TABLE PIN DIAMETERS FOR BENDS Bar Diam (mm) Length Allowance (mm) (assumed pin diameter, 5 d b ) TABLE HOOK AND COG ALLOWANCES FOR BENT BARS AND FITMENTS MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 9 of 14

10 1 2 3 Case Condition Tolerance(mm) 1 Where concrete cover to the 1a. At the end of reinforcement is the controlling reinforcement. factor. Tolerances on Dimensions 'C' b. At the outside edge of Tolerances on Dimension 'T' reinforcement or fitment when compression face when tension face Tolerances on Dimension 'B' when tension face when compression face 2 Where cover is not 2a. At the end of reinforcement. Tolerance on Dimension 'L'. controlling. ± 50 (see Case 1) 2b. At the outside edge of Tolerances on Dimension 'E' reinforcement including ±10 fitments. 3 Lateral spacing of 3a. Beam or column type member. reinforcement. 3b. Slab or wall type member. Tolerance on Dimension 'S' +0.1S or ± 15mm whichever is greater. 4 Bars in corners, crossing bars Bars to be placed in configuration starter bars, etc. shown on the Drawings. Tolerances on location of an individual bar ± 15mm unless otherwise limited by cover requirements of case 1 above. The tolerances given above are the maximum permissable, but it should be noted that in some circumstances, where reinforcement is fabricated to maximum tolerance, they may not be fully available. NOTE: This table should be read in conjuction with Table TABLE TOLERANCES ON FIXING REINFORCEMENT MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 10 of 14

11 NOT USED AS BUILT AND HANDOVER REQUIREMENTS NOT USED CONTRACT SPECIFIC REQUIREMENTS NOT USED MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 11 of 14

12 SPECIFICATION 822 GUIDANCE NOTES DELETE THESE GUIDANCE NOTES FROM FINAL DOCUMENT AFTER USING FOR REFERENCE All edits to downloaded TDP documents shall be tracked (most word processing software allows this to be done automatically). Deletions shall be struck through e.g. example. Insertions shall be in italics e.g. example. If all information relating to a clause is deleted then the clause number should be retained and the words "NOT USED" should be inserted. The proposed documents with tracked changes shall be submitted to the Project Manager for review, prior to printing the final batch of documents. When this final printing is carried out, the tracked changes option is to be turned off. The Custodian of this specification is the Structures Design and Standards Engineer. NO GUIDANCE NOTES OR CONTRACT SPECIFIC REQUIREMENTS AVAILABLE AT THIS TIME. MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 12 of 14

13 CONTRACT SPECIFIC REQUIREMENTS TO ADD OR DELETE The following clauses are to be placed under the CONTRACT SPECIFIC REQUIREMENTS as required. MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 13 of 14

14 SPECIFICATION AMENDMENT CHECKLIST Specification Name: No: 822 Revision No: Title: STEEL REINFORCEMENT Project Manager: Name: Signature: Date: Checked By: Name: Signature: Date: Contract No: Contract Description: ITEM DESCRIPTION SIGN OFF Note: All changes/amendments must be shown in Tracked Change mode until approved. 1. Project Manager has reviewed Specification and identified Additions and Amendments. 2. CONTRACT SPECIFIC REQUIREMENTS addressed? Contract specific materials/products/clauses added? (Refer Specification Guidance Notes for guidance). 3. Any unlisted Materials/Products proposed and approved by the Project Manager? if Yes provide details at Standard Clauses amended? MUST SEEK approval from MCP. 5. Clause deletions shown as NOT USED. 6. Appropriate INSPECTION & TESTING parameters included in Spec 201 (Test Methods, Minimum Testing Frequencies verified). 7. ANNEXURES completed (Refer Specification Guidance Notes). 8. HANDOVER and AS BUILT requirements addressed. 9. Main Roads QS has approved changes to SMM. 10. Project Manager certifies completed Specification reflects intent of the design. 11. Completed Specification independent verification arranged by Project Manager 12. Project Manager s review completed. 13. SPECIFICATION GUIDANCE NOTES deleted. 14. TABLE OF CONTENTS updated. 15 Supporting information prepared and submitted to Project Manager. Further action necessary: Signed: (Project Manager) Date: MAIN ROADS Western Australia Specification 822 Steel Reinforcement Page 14 of 14