A. Personnel's Qualification: Design and construction shall be executed and supervised by fully qualified personnel B. MOCK-UP
1. Section 01400 – Quality Requirements: Requirements for mock-up.
2. Construct mockup, 3.00x3.00 m in size, including formwork, form liners, form and accessories. 3. Locate where directed by Engineer.
4. Incorporate accepted mockup as part of Work. 1.05 DESIGN CRITERIA
A. Formwork systems shall be prefabricated and properly designed to meet the requirements herein and any portion which shows signs of sagging or displacement shall be rectified.
B. All formwork shall be constructed plumb, true water and mortar tight, sufficiently rigid and strong to prevent sagging between supports and to maintain true position and shape during and after placing of concrete without bowing and distortion.
C. Exceptional care shall be taken to minimize fins, ridges, offsets, leaking of fins and other defects. D. Design shall take into account:
1. Height of pour 2. Thickness of member 3. Rate of pour 4. Concrete slump 5. Placing temperature 6. Texture of finish 7. Concrete density 8. Construction joints 9. Wind load
10. On soffit forms (in addition to concrete weight): a. An additional live load of 2.5 KN/sq.m, OR
b. If a motorized cart is used, an additional live load of 3.75 KN/sq.m 11. Minimum design load for combined dead and live load:
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b. If a motorized cart is used, 6.24 KN/sq.m 12. The worst combination of:
a. Self-weight b. Formwork forces c. Reinforcement Weight d. Wet concrete weight e. Construction loads f. Wind loads
g. Incidental dynamic effects caused by placing, vibrating and compacting concrete.
h. The use of externally applied vibrators. 13. Methods of concrete discharge.
E. Design formwork to be:
1. Sufficiently rigid to maintain the correct position shape and profile so that the final concrete structure is within the dimensional tolerance specified in ACI-301, Chapter 4.
2. Demountable without shock, disturbance or damage to concrete. Soffit formwork, properly supported on props only, shall be capable of being remained in position during concrete maturing period.
F. Adjustable steel supports and props shall allow form boards and framework to be accurately adjusted to line and level. Design shall allow free movement and accessibility under formwork.
G. Props for abnormal ceiling heights shall be specially designed. 1.06 SUBMITTALS
A. Submit samples of all materials proposed for use in formwork. B. Submit samples of ties proposed for use in the following situations:
1. Water retaining structures
2. Above water table in general situations 3. In fair faced concrete.
C. Submit all other information requested by the Engineer. 1.07 SHOP DRAWINGS:
A. Submit shop drawings of formwork design, including plans and sections, giving the following minimum information for each level:
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2. Position, size and spacing of adjustable steel props. 3. Position, size and spacing of joints, soldiers, ties and the like. 4. Details of formwork for columns, beams, parapets, slabs and kickers. 5. Detail of formwork for column, beam junctions.
6. Details of retaining walls and deep beams showing the position and size of ties, joints, soldiers and sheeting, together with detailed information on erection and casting sequences and construction joints.
7. General assembly details. 8. Full calculation sheets.
9. Proposals at the penetrations through concrete.
10. Proposed sequence of de-propping beams and slabs for different spans and floor heights and number of floor heights and number of floors propped, and the striking time for supported and suspended structural elements, clearly identifying the supported element and suspended element.
B. Scales of shop drawings: 1. Details 1:1, 1:5, 1:10, 1:20. 2. Construction 1:50
C. Allow fourteen (14) days for the Engineer's review of shop drawings. PART – 2 MATERIALS
2.01 MANUFACTURERS:
A. Doka Formwork Technology B. Quebeisi SGB – Sharja S
C. Golf Scaffolding Company
D. Substitution under provisions of Section 01600 2.02 FORM WORK:
A. For unexposed surfaces and rough work, use exterior Type Douglas Fir, Grade B-B (concrete form) plywood, conforming to NBS PS-1, minimum 19mm thick. Before reusing forms, withdraw nails and thoroughly clean surfaces to be in contact with concrete.
B. For exposed surfaces not otherwise specified use special exterior Type Douglas Fir, Grade A-B plywood, conforming to NBS PS-1, minimum 19mm thick OR density (60-60) overlay ply-form, Class 1 EXTDFPA, sanded grade trade marked by the American Plywood Association having a hard semi-opaque resin-fibre overlay on both sides, minimum 19mm thick and constructed so that finished concrete will be straight, smooth, dense, free from honeycombs, bulges, or depressions. Keep joints between plywood sections to a minimum and make tight and strongly backed so that adjoining edges remain flush and true. Unsightly joint marks will not be permitted. Cover
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joints on exposed surfaces will be smooth-faced fibre reinforced tape as manufactured by Techtrade
International, 54 Old Christchurch Road, Bournemouth, Dorset, U.K. or other equal and approved of proprietary brand to be approved by the Engineer.
C. Location of joints must be submitted to Engineer for approval.
D. Prefabricated formwork systems may be used for all classes of concrete provided the manufacturer's printed instructions and recommendations are followed and the system has been approved by the Engineer. Joints between sections of prefabricated forms shall be taped unless otherwise recommended by the manufacturer and provided always, in the case of such recommendation, the forms are water and mortar-tight to the Engineer's satisfaction.