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SPECIFICATION Description of the Works (Particular Specification) General Technical Requirement

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SPECIFICATION Description of the Works (Particular Specification) General Technical Requirement Emergency Rehabilitation of Flood Affected Basic Services Facilities in El Fasher, North Darfur SCHOOLS& CLINICS SPECIFICATION Description of the works (Particular specification) General technical requirement 1 5¼ ½!Â!$Â ½ Ä!! 1. DESCRIPTION OF THE WORKS (PARTICULAR SPECIFICATION) 1.1 CONSTRUCTION OF SCHOOLS BUILDING 1.2 REHABILITATION HEALTH CLINICS 2. GENERAL TECHNICAL REQUIREMENT 2.1 BUILDINGS AND LANDSCAPING. 2.1.1 GENERAL 2.1.2 MATERIALS FOR BUILDING TRADES 2.1.3 FABRICATION AND ERECTION 2.1.4 PLASTERING 2.1.5 MISCELLANEOUS METALS 2.1.6 PAINTING 2.1.7 CAULKING 2.1.8 CEILINGS 2.1.9 PLUMBING AND SANITARY FITTINGS 2.1.10 RUBBLE MASONRY 2.1.11 DRAINAGE 2.1.12 PAVED AREAS 2.1.13 DOORS & WINDOWS (STEEL) 2.1.14 ROLLER DOORS (ALUMINIUM) 2.1.15 DOOR SEALS 2.1.16 GLASS 2.1.17 CERAMIC FLOOR & WALL TILING 2.1.18 LIGHTING AND BUILDING INSTALLATION 2.1.19 LANDSCAPING 2 2. GENERAL TECHNICAL REQUIREMENT 2.1 Buildings and Landscaping 2.1.1 General Works in this section consists of furnishing of all labour, materials, apparatus and appurtenant work in connection with building trade work. In general, all building trade work shall comply with the relevant Specification for Buildings in UK or Sudan and for all building works and sanitary and other installations. 2.1.1.1 Work Included The work includes, but is not limited to the following: (a) Brick Masonry Construction (b) Roof Construction (c) Floor and Wall Finishes (d) Glass and Glazing (e) Miscellaneous Metal (f) Carpentry (g) Ceiling (h) Any other Work shown on the Drawings or specified herein. 2.1.1.2 Related Work not Include in this Section: (a) Miscellaneous Structural Work. (b) Field Painting. 2.1.1.3 Co-ordination and Co-operation Work of this section shall be fully co-ordinated with related work of other trades. Particular attention is required for items embedded in concrete or masonry. 2.1.1.4 Submittals Shop drawings shall be submitted prior to fabrication of any work. These drawings shall be based on the Tender Drawings, specification, and field measurements and shall present complete information as to fabrication, installation and proper fitting with other construction. 2.1.1.5 Sample Panels Samples of plastering, flooring, joinery, tiling, door, window, painting and any other works if requested shall be submitted to the Engineer for approval. 2.1.2 Materials for Building Trades 2.1.2.1 Delivery and Protection of Materials The Contractor shall deliver all materials to the job site in manufacturer's original containers, properly labelled for identification. The Contractor shall provide raised platform and waterproof covers to protect the materials from the weather and from contamination of loose dirt, and debris. 2.1.2.2 Roofing First quality Calicut tiles or long span zinc/aluminium corrugated sheets shall be used. 2.1.2.3 Bricks First quality properly pressed bricks, regular shape and uniform in colour shall be used. Brick dimensions shall conform to BS 3921 Part. 2 and shall be of nominal depth of 60 mm. Samples shall be submitted to the Engineer for his approval. Common bricks of the internal quality shall be the solid type. Special selected quality bricks of the solid type shall be used for facing bricks. Independent tests shall be carried out on samples of bricks. The Sampling Procedure & Testing Methods shall be in accordance with the requirements of BS 3921 Part 3. 2.1.2.4 Cement 3 Cement shall be Portland Cement BS 12 and the locally available cement brand shall be subject to the approval of the Engineer. 2.1.2.5 Fine Aggregate and Course Aggregate Concrete Works: Concrete works for buildings shall be carried out in accordance with British Standard BS 8110. Concrete plasticizing and set-retarding admixtures may be used only with the approval of the Engineer and the Contractor shall note that the exposure condition for the concrete at these sites is classed as severe. The Contractor shall contact the manufacture of such admixtures for details on concrete mix parameters. Concrete mix designs shall be submitted to the Engineer for approval, at least three weeks prior to plans to carry out a test mix and test block of the reservoir wall using same formwork and form-ties as proposed in the construction. Form-ties shall require prior approval of the Engineer before carrying out the test block. .Curing of the concrete shall be carried out immediately after placement and compaction of the concrete, in accordance with BS8110. The bottom slab shall be finished by motor trowel to a smooth surface. Building Works: The sand may be naturally occurring material like river sand, pit sand or crushed stone sand. It shall generally conform to BS 1198, BS 1193 and BS 1200. It shall be hard, durable, clean and free from adherent coatings such as clay. It shall not contain harmful materials like pyrites, salts, coal or other organic impurities, mica, shale or similar laminated materials, or flaky or elongated particles in such a form or in sufficient quantity to affect adversely the hardening, strength or durability of the mortar. In addition to the above, the sand when used for reinforced brickwork shall not contain any material, which may attack the reinforcement. The quantity of clay, silt and dust shall not exceed the following unless there is satisfactory evidence to the contrary. In natural sand - 3% by mass when determined by the decantation method given in BS 812. In crushed stone sand - 15% by mass when determined by the sedimentation method given in BS 812. Sand for brickwork/stone work/block work and external plastering shall pass completely through a sieve of 2.36 mm sand for second and third coats of plastering, pointing and fine work shall completely pass through a 1.18 mm test sieve. 2.1.2.6 Water Potable water shall be used for concrete mix. 2.1.2.7 Reinforcement Unless otherwise specified or required, the design, materials, workmanship and erection shall conform to the requirements of BS 8110 and BS 8007. Reinforcing steel shall conform to BS 4449: Hot rolled mild steel 250 N/mm2 denoted as “R” High yield steel (hot rolled or cold worked) 460 N/mm2 denoted as “Y” The high yield steel shall be deformed bar type 2. Welded Steel Wire Fabric shall conform to BS 4483. The Tie Wire shall conform to BS 4482 – 1.6 mm black annealed mild steel. Representative samples of all reinforcing steel that the Contractor proposes to use in the Works shall be submitted, before the work is commenced, to the Engineer for his written approval. Manufacturer’s certificates to be provided by the Contractor shall clearly state the place of manufacture, relevant details of composition, manufacture, strength and other qualities of steel. Frequency of sampling and method of quality control shall be in accordance with Appendix C of BS 4449. Tack welding if approved by the Engineer in writing shall conform to AWS D 1.4 or BS EN 1011. – Bar Size Table Nominal Diameter(mm) Weight (kg/m) 4 6 0.222 Round (Plain) 8 0.395 Round (Plain) 10 0.617 Deformed 12 0.888 Deformed 16 1.579 Deformed 20 2.466 Deformed 25 3.854 Deformed 32 6.313 Deformed Reinforcing bars shall be rejected if the weight of a bundle of one size of bars as delivered is underweight by 3.5 percent or more. An individual bar will be rejected if it is underweight by 6.0 percent or more. 2.1.2.8 Steel for Hollow Metal Doors and Frames Cold rolled stretcher leveled carbon steel with hot-dip galvanized G-90 type zinc coating conforming to ASTM A525. 2.1.3 Fabrication and Erection 2.1.3.1 Brick Masonry Erection (1) General Except as herein specified, brickwork shall conform to the requirements of C.P 121:101 and various Standards referred to herein. All materials for brickwork shall be handled and stored on site in such a manner as to avoid damage or contamination. Bricks straight from the kiln shall not be used in walling and brick deliveries shall be arranged to ensure that natural weathering takes place for a minimum period of 4 weeks before use. (2) Mortar Mortar shall be composed of cement and sand and the constituents shall be mixed in small batches in a mechanical mixer and used fresh. Cement shall be ordinary Portland cement stored and handled as stipulated in this Specification. Mortar mixes for brick joints shall be measured by volume and be composed of 1 part of Portland cement to 3 parts of sand, or 1 part of "Walcrete" Cement to 5 parts of sand for brickwork laid above the level of damp-proof course unless specified otherwise in the drawings. Prior approval shall be obtained from the Engineer to the use of any admixture in mortar. Mortar shall be used within an hour of adding water to the mix and no softening or reviving of the mortar will be allowed in any circumstances. (3) Brickwork Brickwork shall be jointed and pointed with mortar unless otherwise instructed by the Engineer. All brickwork is to be built with horizontal courses and vertical pretends and in vertical planes. The finished surface must be true to line and level. Window and door openings are to be furnished accurately to size, and finished solid against metal or wood frames. Unless the sides of the brickwork are to be plastered or rendered, the brickwork is to have fair-faced sides. Walls with fair face both sides shall have a Weathered Joint externally and a Flush Joint internally both as shown in C.P.121.
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