HANLON AND PARTNERS LTD Consulting Structural & Fire Engineers. Specification for. Mental Health Acute Inpatient Unit Wakari Hospital, Dunedin

Transcription

1 Specification for Mental Health Acute Inpatient Unit Wakari Hospital, Dunedin Mason & Wales Architects Ltd PO Box 5455 DUNEDIN HANLON AND PARTNERS LTD 219 HIGH STREET, DUNEDIN B I CHISHOLM Ph. (03) Fax (03) BE MIPENZ IntPE CPEng (Civil & Structural) office@hanlons.co.nz

2 2.10 DEMOLITION OF CONCRETE STRUCTURES General: See Hanlon & Partners Ltd drawings number Sheets s1-s4 for details of the extent of demolition of the existing reinforced concrete structure The existing concrete is heavily reinforced. The structural drawings of the building, which was built in 1956, are available for perusal at the office of Hanlon & Partners Ltd Falsework: Allow for all falsework necessary to support sections of the existing building which may be undermined by demolition work. This falsework shall be maintained until the new structure provides permanent support Falsework shall also be installed as necessary to prevent cut and broken sections of concrete from falling on to structures below Cutting and Breaking Out: Cutting and breaking out methods shall ensure there is no damage to any part of the building which is to remain.

3 SECTION 3 - EXCAVATION 3.1 GENERAL Read in conjunction with Specification, Section 1, Preliminary and General and the General Conditions of Contract. 3.2 FOUNDATION DEPTHS General: The minimum depth of foundations shall be those shown on the drawings but the suitability or not of the grounds bearing capacity and the final depths of excavations shall be determined by the Engineer. The Contractor shall inform the Engineer as soon as possible after excavations reach what the Contractor considers suitable bearing Subsoils: Subsoils are expected to be firm silt/clays complying with good ground as defined in NZS 3604:1999. Should good ground not be found the Engineer shall be advised. 3.3 SUPPORT OF EXCAVATION FACES The Contractor shall be responsible for the support of the sides of all excavations and the support of any adjacent building foundations until they are supported by the new permanent structure. 3.4 GROUND WATER CONTROL Water shall be pumped from the site and from the excavations and the excavations shall be kept dry while backfilling or excavating is proceeding. 3.5 BACKFILLING Beneath Footings : Where the Engineer requires further excavation beneath the as drawn footing depths backfilling shall be as follows: i. When the backfill depth is less than 600 mm: Mass Concrete (7 MPa Crushing Strength at 28 Days). ii. When the backfill depth exceeds 600 mm: Mass Concrete as for (i) or hardfilling consisting of AP40 crushed second class metal placed and compacted in layers not exceeding 150 mm deep Beneath Floor Slabs: As for (ii) above. 3.6 SURPLUS EXCAVATION MATERIALS Remove all surplus excavation materials from the site.

4 SECTION 4 - CONCRETE 4.1 GENERAL Read in conjunction with Specification, Section 1, Preliminary and General and the General Conditions of Contract All concrete construction shall comply with NZS 3109:1997 and Amendments thereto The Contractor is expected to possess copies of these Standard Specifications Non-familiarity with these Standard Specifications will not be accepted by the Engineer in the case of non-compliance. 4.2 CONSTRUCTION JOINTS Construction Joints shall generally be Type A: - Refer Clause CONCRETE STRENGTHS Concrete Strengths Grade 28 Day Strength Mass Concrete backfill & blinding Ordinary 7 MPa Concrete block filling Normal 20 MPa Floor slabs Normal 25 MPa All other insitu concrete Normal 20 MPa 4.4 CONCRETE FINISHES Shall generally be in accordance with Tables 1 & 2 of NZS 3114:1987 as follows: - Concealed wall & foundation surfaces - F1 - Exposed foundation & wall surfaces - F5 - Ground floor slabs - U3 - Exterior Slabs - U5 See Architect Notwithstanding the above the Contractor shall consult with the Architect about the finish to be achieved on specific floor areas. 4.5 REINFORCING Reinforcing shall comply with AS/NZS 4671:2001. Reinforcing denoted as D10, D12 or D16 on the drawings shall be deformed grade 300E only Reinforcing denoted as H16, H20, H25, H28, H32, H40 shall be deformed grade 500E MA type only. QT type is not acceptable Reinforcing denoted as R10 or R12 on the drawings shall be plain round grade 300E only Reinforcing shall be bent in accordance with NZS Grade 500 reinforcing shall not be re-bent unless as directed by the Engineer.

5 4.6 DAMP PROOF MEMBRANE UNDER SLABS Under the floor slabs and on top of the backfilling, supply and lay a dampproof membrane of 0.25 mm polyethylene film Tape all joints with polyethylene self adhesive tape All the work in handling, storing, laying and taping this polyethylene film shall be carried out strictly in accordance with the Manufacturers printed instructions. 4.7 CURING Slabs shall be cured for seven days using one of the methods specified in NZS 3109: The contractor shall confirm curing methods with the Engineer before slabs are poured.

6 SECTION 5 - STRUCTURAL STEELWORK 5.1 GENERAL Read in conjunction with Specification, Section 1, Preliminary and General and the General Conditions of Contract. 5.2 MATERIALS Steel shall comply with one of the following Standards: AS/NZS Welded and seamless steel hollow sections for general structural purposes AS/NZS Hot rolled steel flat products AS/NZS Structural Steel - hot rolled plates, floor plates and slabs AS/NZS Structural Steel: o : Part 1 - Hot-rolled bars and sections grade 300. o : Part 2 - Welded sections Steel tubes shall comply with BS FASTENERS Steel bolts, nuts and washers shall comply with the following Standards: AS/NZS 1110 ISO Metric hexagon precision bolts and screws AS/NZS 1111 ISO Metric hexagon commercial bolts and screws AS/NZS 1112 ISO Metric hexagon nuts including thin nuts, slotted nuts and castle nuts AS/NZS 1252 High strength steel bolts with associated nuts and washers for structural engineering AS 1559 Fasteners - bolts, nuts and washers for tower construction All steel shall be clean and free from dirt and grease. Maximum extent of rust shall not exceed that for Grade B Swedish Standard SIS FABRICATION AND ERECTION All work shall comply with Section 14 & 15 NZS 3404: Weld category shall be GP All butt welds shown on the drawings shall be full penetration butt welds. 5.5 WELD INSPECTION The Engineer will visually inspect all welds Radiographic or ultrasonic testing may be required to confirm acceptability. Should these tests show levels of weld imperfections greater than those allowed in Section 6 of AS , the Contractor shall meet the costs of the tests. 5.6 PAINTING After fabrication the steel fabricator shall touch up all areas where cutting, welding etc. has removed the prime coat. Welds shall not be painted prior to deslagging, inspection and approval.

7 5.6.2 Fire Rated Steelwork See Hanlon & Partners Ltd drawing 11658/s2 for location of steel to be fire rated and for level of fire rating: Blast clean to SA2½ Swedish standard. Remove all dust etc., - preferably by vacuum cleaning. Overcoat steelwork within 2 hours of cleaning. Paint with one coat of Firepro C627 High Performance Steel Primer to the Paint Manufacturers Recommendations. Allow adequate drying time. The following intumescent coatings shall be applied to the completed in place steelwork to the Paint Manufacturers Recommendations: o For solid sections Firepro C606 Fireshield o For hollow sections Firepro C Preparation & Prime Coat - for all steel work other than that covered by 5.6.2: Hand or mechanical clean to a minimum standard of St 2 Swedish Standard S1S Remove all dust etc., - preferably by vacuum cleaning. Overcoat steelwork within 2 hours of cleaning. Paint with one coat of Resene/Ameron Steel Fab or equal to the Paint Manufacturers Recommendations. Allow adequate drying time. No top coat. 5.7 PROTECTION DURING HANDLING AND ERECTION The Structural Steel Erection Contractor shall take every precaution to protect the paintwork from damage during the handling and erection of the steelwork All touching up of paintwork, if required after erection, shall be carried out by the Steel Erection Contractor.

8 SECTION 10 - REINFORCED CONCRETE MASONRY 10.1 GENERAL All masonry construction shall comply with NZS 4210:2001, a copy of which the Contractor shall keep on site at all times All masonry shall be constructed to the requirements of Grade B Masonry as outlined in NZS 4230: Grout filling of the 20 series blockwork shall be by the High Lift Grouting Method as specified in Section 2.12 and 2.13 of NZS 4210: Refer to drawings for construction details.