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Concrete works

Concrete works

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Concrete works Concrete works Presentation Transcript

  • Lecture 1- Concrete Works Section F By Tantish Kamaruddin
  • INSITU CONCRETE MEASUREMENT FOR CONCRETE FOUNDATION Types of foundation: 1. Strip foundation 2. Pad foundation 3. Raft foundation 4. Piled foundation/pile caps
  • F.1 GENERALLY 1. Particulars of the following shall be given (in description): a. Kind and quality of materials for concrete b. Test required of the materials c. Test required for the finished materials d. Mix or strength requirement of the concrete
  • 2. Reinforced work shall be so described. 3. Concrete designed to be waterproof shall be so describe stating the measures to be adopted. 4. Concrete required to be placed by a particular method, poured at stated speed, compacted or cured in a particular way shall each be so described.
  • 8. Concrete shall be measured as carried out but NO DEDUCTION shall be made from the quantities measured for the following: a. Volume of any steel embedded in the concrete. b. b. Voids due to boxed or tubular steelwork no exceeding 0.05 m2 sectional area. c. Voids not exceeding 0.05 m3 other than voids in soffits of troughed or coffered slab.
  • F.2 CLASSIFICATION OF SIZE 1. Where the thickness is required to be stated (in description) , the classification shall be one of the following categories: Not exceeding 100 mm 100 – 150 mm 150 – 300 mm exceeding 300 mm 2. The stated thickness of walls, beds and slabs shall exclude projections and recesses.
  • F.3 CONCRETE CATEGORIES 1. All members unless otherwise stated shall be measured in cubic metre (volume of concrete) and measured separately according to F.3.2 – 21. 2. Foundation in trenches i.e strip foundation. 3. Isolated foundation bases to column and pier stating the numbers(in the description) i.e pad foundation. 5. Ground beams. 7. Pile caps stating the number. 8. Beds which shall include thickening but to exclude upstands, stating the thickness as Clause F.2.1.
  • F.3 CONCRETE CATEGORIES (Cont’d) 14. Beams, casing to steel beams shall each be measured separately i.e floor beam, roof beam etc. 15. Isolated columns.
  • REINFORCEMENT F.8 BAR REINFORCEMENT 1. Particulars of the following shall be given: a. Kind and quality of steel i) Mild steel. Symbol – R ii) High tensile/yield steel. Symbol – Y b. Section of bar other than plain circular. c. Tests of bar (in specification) d. Restriction to bending (in specification)
  • 2. Bar shall be measured in KILOGRAMME or TONNE stating the diameter. Each diameter shall be measured separately. 3. Cutting to length, bends, hooks, tying wire, distance blocks, ordinary spacer shall be deemed to be included in the item. 4. The following shall be measured separately: a. Straight and bend bar b. Curved bar irrespective of radius c. Links, stirrups, binders and the like. d. Spacers.
  • 5. Horizontal bars and bars sloping not more than 300 from horizontal over 12.00m in length shall be so described stating the length in further stages of 3.00m. 6. Vertical bars and bars sloping more than 300 from horizontal over 6.00m long shall be so described stating the length in further stages of 3.00m.
  • F.9 FABRIC REINFORCEMENT Particulars of the following shall be stated in the description: a. Kind and quality of steel b. Section of bars making up the fabric if other than plain circular. c. Test of fabric d. Restriction of bending
  • 2. Fabric reinforcement shall be measured as the area covered (measured nett – no allowance for laps). No deduction shall be made for voids not exceeding 1.00 m2. 3. Fabric reinforcement shall be measured in square metre stating the mesh, weight per square metre and the minimum sides and end laps.
  • FORMWORK F.10 GENERALLY 2. The following shall be deemed to be included in the formwork: a – f : All works related to erection of formwork. 3. Formwork shall be measured to the surfaces of finished structure which requires to be supported during deposition of concrete. 4. No deduction s shall be made for voids not exceeding 1.00 m3. 6. Formwork that is permanent character and to be left in shall be so described.
  • FORMWORK (Cont’d) 7. Formwork to curved surfaces shall be described stating the geometrical nature and the radius. 8. Formwork to soffits less than 1.00m high shall be so described. 9. Formwork to soffit or soffits of beams over 3.50m shall be so describe stating the height in further stages of 1.50m.
  • F.11 FORMWORK TO FOUNDATION AND BEDS 1. Formwork to edges and faces of foundations (which includes bases, pile caps and beds) and formwork to ground beams where exceeding 1.00 m high shall each be measured separately in square metres. Where not exceeding 1.00 m high, they shall be measured in linear metre stating the height in the following categories: Not exceeding 250 mm high. 250 – 500 mm high. 500 – 1.00 m high.
  • F.15 FORMWORK TO PILASTERS AND COLUMN 1. Formwork to pilasters and formwork to isolated column and column casing , defined as column and column casing not contiguous with a wall and where their length on plan does not exceed four times their thickness shall each be measured separately in square metres. 4. No deduction shall be made for beam intersections.
  • MEASUREMENT FOR STRIP FOUNDATION Items to be measured: a. Concrete i) Blinding ii) Footing b. Formwork to sides of footing c. Reinforcement (if any)
  • MEASUREMENT FOR PAD FOOTINGS Items to be measured: a. Concrete i) Blinding under pad footings ii) Footings b. Formwork to sides of pad footings c. Reinforcement Depending on: i) Type of steel ii) Diameter of steel iii) Shape of reinforcement
  • MEASUREMENT TO COLUMN STUMP Items to be measured: a. Concrete to column stump (measured as PROVISIONAL) b. Formwork to sides of column stumps (measured as PROVISIONAL). c. Reinforcement to column stump (measured as PROVISIONAL) i) Main bar ii) Links
  • NOTE  Items for column stump is measured as PROVISIONAL because the height of column stump is dependent on the depth of excavation for pad footing (normally being determine on site during actual excavation).  Height of column stump is taken from the top of the pad footing to the top of ground beam.