Presentation on theme: "Specification & Quantities Estimating Lecturer Maha Muhaisen College of Applied Engineering& Urban Planning."— Presentation transcript:
Specification & Quantities Estimating Lecturer Maha Muhaisen College of Applied Engineering& Urban Planning
Preparation of engineering measurements measurement sheet project name _________________ contractor name ____________ engineer name _______________
ItemunitMethod of measurement Site levelingLump sumIt takes into consideration all site leveling including the excavation, fill, till reach 0+B.M according to design drawing. Excavation (cut)m3Measured by 2 methods : 1- footings areas according to blinding area * depth of excavation according to drawings. 2- external dimensions of the building *depth of footings Fill (backfill)m3= excavation – concrete work for footings and columns under ground level. = ground plan *depth of ground beams – (concrete for ground beams and ground floors) Measurement of works / Earth Work
Concrete works measures engineering measurement All openinng more than 0.1m2 or 0.1 m3 are deducted. The concrete works more than the areas, volumes in the drawings doesnt included. Measurement of works / concrete works
ItemunitMethod of measurement Blinding concrete, ground concrete, benching, and slabs concrete with fixed thickness m2= length * width (the thickness should be specified in the drawings and specifications) Ribs blocks dont subtract from the slabs concrete. Footings, columns, ground beams, stairs, and canopies, m3= length*width*thickness -Ground beams are measured from its connection with columns - concrete stars include the stairs, steps, stair slabs, walls supporting the stairs. Concrete decoration works as curves. No.The dimensions must be specified in the drawings.
Measurement of works / block works ItemunitMethod of measurement Block worksm2= length * width (the thickness should be specified in the drawings and specifications) - subtracting all openings more than 0.1 cm2.
Measurement of works / Plastering/ painting works ItemunitMethod of measurement Length * widthM2= length * width (engineering measurement after subtracting the openings, more than 0.1 m2) - the area is measured above the skirting (terrazzo chips) Internal plastering = walls + slabs
Measurement of works / tilling works ItemunitMethod of measurement Terrazzo, marble, ceramic m2= length * width (engineering measurement)
Measurement of works / Plastering/ painting works ItemunitMethod of measurement Plastering & painting M2= length * width (engineering measurement after subtracting the openings, more than 0.1 m2) - the area is measured above the skirting (terrazzo chips) Internal plastering = walls + ceiling
Measurement of works / Doors ItemunitMethod of measurement DoorsNo.The exact dimensions should be specified in the design drawings. Sometimes carpentry works measured in m2 or m length according to the item described in BOQ.
Measurement of works / Windows ItemunitMethod of measurement windowsNo.The exact dimensions should be specified in the design drawings. Sometimes carpentry works measured in m2 or m length according to the item described in BOQ.
Measurement of works / electrical & sanitary works ItemunitMethod of measurement Electrical and sanitary pieces / accessories No.The dimensions should be specified clearly in the design drawings as the sockets, lamps, fluorescent lighting,…etc (W.C., washing basins, sinks, manholes, pumps…etc) pipingM.RThe dimension and details should be specified in the drawings, as (cables, pipes,..etc) Works with special detail Lumps sumAll details should be specified in the drawings, as earthing, gas network,
Bill of Quantities The results in the quantities book, are recorded in the BOQ table. It is preferable to add 5-10% percentage on the quantities for contingency to avoid any errors or any.
No.Item descriptionunitQuantityUnit price ($ or NIS …) Total amount ($ or NIS …) 1The works include……L.S Bill of Quantities See the attached example
The items are classified into categories as shown in the next table. at the end of BOQ, summary of the items are shown as well as the total amount of the price Bill of Quantities
Summary table No.ItemTotal amount ($ or NIS …) 1-EXCAVATION & EARTH WORKS 2CONCRETE WORKS 3-BLOCK WORK 4-CARPENTRY 5-METAL WORK 6-FINISHING WORKS 7-PLUMBING WORKS 8-ELECTRICAL WORKS 9-MISCELLANEOUS
Item description Based on drawings, specification. It should be accurate and reflect the drawings and specifications, Description should include : 1- what does the price include: 2- unit 3- determine the method of measurement.
How to read the description Description of the items Drawings, details Specifications General and specific conditions Instruction of the supervisor engineer
Inclusiveness of the work price The description of the item should include all the work that the unit price will take account of as will be illustrated in the following
1- Earth work The unit price should include :- Excavation in any kind of soil, rock, etc., starting at reduced level (bottom of G.B. blinding) down to bottom of foundation blinding including compacting backfill around foundations and shall be applied on layers, 200 mm thick, watered and compacted to 95 % (98%) according to modified AASHTO Density Test T-80.for the excavated foundation and removal of surplus material from site to an approved dumping area complete as per specifications. - Site Leveling. (Excavation of all Site including External Works). Cut and / or fill in any kind of soil, concrete, or asphalt; to the required Levels approved by the Engineer (Reduced Level). Including scraping of top. Any damage to the external walls, fence, etc. should be maintained without any compensations.. - Test of the soil (4 points at least) - Safety around the site, - Work according to engineer instruction and specifications
Concrete work Concrete works include: All formworks and shuttering in any form, shape and size. Making chamfered and curved edges, allowing for and making grooves and sleeves and the like; removal of forms and cleaning of all exposed tie wires and rods; making good the harmed surfaces and Supplying, Casting, vibrating and curing as per specifications. Approved additives and admixtures. Incurred costs on Concrete Mix Designs, Sample taking, testing and providing test results certificates, storing and saving of samples, and preparation of bar bending schedules and workshops. Supplying reinforcement of any grade, size and length as detailed in the drawings, storing on site including cutting, bending and fixing in position and providing all tying wires, spacers, shop drawings, testing and bar bending schedules
Concrete work (contd) Painting of exposed surfaces of underground reinforced concrete elements with two coats of Bituminous Emulsion. Supply of Polyethylene sheets under ground slabs. Steel bars used for alignment and fixing of reinforcement works, and extra steel added to assure proper detailing and safety. Measurement of Concrete elements shall be the net dimensions as detailed in the drawings. All recesses, openings and voids shall be deducted. Measurement shall be only for the seen surfaces of elements, overlapping and measuring items twice under separate headings shall not be allowed. Supplying and fixing of the required steel reinforcement as per drawings and specifications.
Block works Rates of Block works include All works of the bill shall be of Concrete blocks of high quality standards and as per specifications. Vertical and horizontal joints., Cement and mortar, Galvanized angles and ties., Closed end blocks at all ends, door and window jambs, reveals and the like. Concrete filling including reinforcing steel to cavities at quoins and door and window openings. Lintels and bond beams to the full length of the wall, and all needed to complete job as per drawings and specifications concrete infill and transporting, placing compacting, curing, surface finishing, protection, construction and expansion joints and all labors and materials and tests.
Block works (contd) Block work shall be bonded to concrete columns, wall and the like with concrete infill B250. block must be stopped in graded shape (10-15 cm from the concrete face) one 8 mm bar must cast in columns during casting with 40 cm length fixed every 42 cm horizontally, in addition to two vertical 10 mm bars.
Plastering works, includes The price shall include, all narrow widths, for taking out joints on block walls or backing concrete face for key, for making good to frames around pipes and other fittings, plastering to jambs and reveals of openings ( جانب من النافذة بين اطارها وبين السطح الخارجى للجدار ), side of columns, window sills; all of which shall be included Price shall also include Expanded metal lath, angle beads at all corners and plaster stops at opening edges, expansion joints, sills, labor, curing, erecting and dismantling of scaffoldings سقالات ), additives, pigments and all incidentals required as specified Material, workmanship, Galvanized mesh, or plastic mesh, False ceiling from galvanized mesh and plastering (fixing mesh, covering it by 3-coats of rough plaster) reinforcement of the joints between different material as the joints between the wall and columns.
Tilling works Rate shall include preparation of surfaces under tiles, Finnish to falls and cross falls, special tile peaces for edges and the like, tile surface finishing, Plastic spacers. Pointing and cleaning and all incidental as per specifications. Supply, Install and Terrazzo Tiles, include, bedding and jointing in cement and sand mortar, pointing with white cement, required sand fill, and polishing, workmanship, and all incidental as per specifications Isolation works for kitchen and bathroom (layer of fiber glass, and bitumen layers) Marble includes connections, joints, mortar, and any other needed work. Supply and install a layer of cement and sand under marble and porcelain, ceramic, according to specification and engineer instruction. Supply and spread a layer of sand under the tiles..
Tilling works (contd) Any decoration works as drawings include preparation of surfaces under tiles, special tile peaces for edges and the like, tile surface finishing, Plastic spacers. Pointing and cleaning and all incidental as per specifications
Painting works All Paints shall be supplied to site in sealed container, as approved by the Engineer, and site mixing shall not be permitted. The Contractor rates shall include for supply of all materials, workmanship, samples, primers, surface preparation, protection of painted surfaces, application to all heights as required of works, repair of all damaged surface, as per specification.
CARPENTRY AND JOINERY WORKS (window & doors) Sizes of carpentry works given in the Bills of Quantities are finished sizes and shall be as per Drawings. Sizes of doors and other items mentioned in the Bills of Quantities shall allow for tolerance to suit the structural openings shown in the Drawings. Wooden doors and pair of doors shall be measured in square meter for each structural opening, unless stated otherwise in the Bills of Quantities. Rates for carpentry and joinery work shall include : Shop and coordinated drawings. frames, architrave ( عارضة ), and other holders Allowance for plastering and tiling and the like. Cutting and fitting around obstructions, Bedding and painting. Grounds, blocking and backings. Plugging concrete, block work, and stone work, and making good. Ironmongery including cylindrical locks, handles, stoppers, screws, temporary fixing, re- fixing, oiling and adjusting.
CARPENTRY AND JOINERY WORKS (window & doors) Providing three keys for each lock including tagging. Steel legs, brackets, bearers حامل and other supports including painting. l) Glass and glazing including cutting to size and putty. Preparing surfaces to receive finishes. Painting, varnishing الورنيش, polishing, oiling, and the like, to any area or width in any location including work in multicolor and cutting in edges and putty المعجون.
STEEL AND ALUMINUM WORKS Rates for metalwork shall include for : Preparing shop drawings, Drilling, counter sinking, screwing, bolting and riveting. Sub frames, including galvanized steel frames for Aluminum windows and architrave. Gaskets, sashes, double weather strips and external and internal approved quality silicon filling around frames. Ironmonger including cylindrical locks (Union or equal), stoppers, handles, temporarily fixing, refitting, oiling and adjusting. Providing two keys for each lock. Glass and glazing including cutting to size, putty and rubber. Preparing surfaces for and painting one coat of primer before fixing. Sealing and Painting to any area or width in any location including work in multicolor and cutting in edges. All other accessories and incidentals required to execute the work.
Electrical works All items price to include Supply, Installing, Connecting and testing unless otherwise indicated, the contractor are requested to have approved full coordinated work shop drawings before starting contract activities, the price also includes all works necessary to implement electrical works in approved manner. The contractor intended to order main and final distribution panel boards according to approved manufacturer drawings. The price to include submittals, catalogs, any manufacturer instruction. The contractor should install and construct all works according to drawings, specification tender documents, and requirement of Electrical Co. Contractor should also test & submit the electrical Work to the Electricity Co. & Municipality.
PLUMBING, SANITARY AND MECHANICAL WORKS Rates shall include all fittings, fixtures, appliances and pipe laying Supply of material, workmanship, installation, testing and commissioning. Rates to include also all peaces and fittings, including by passes, floats, cleaning outlets, automatic vents, vents and stack covers, valves and non return valves and the like needed to complete works as per specifications. Insulation and painting as called for in specifications. Excavation and cutting for all pipe laying works, bedding back filling and all works connected with pipe laying. All ties, sleeves, joints, tie bolts and rods, brackets and the like. Rates to include Workshops, Coordinated and as- built drawings as approved by the Engineer
Pricing & price analysis Before construction three types of pricing : 1- cost estimate 2- pricing 3- cost analysis
Preparation of prices contractor Cost analysis pricingengineer Cost estimate
Factors affecting the pricing Raw material Workmanship, labor, sub-contractors Administration cost including direct cost as salaries, equipments, transportation..etc. and indirect cost as electricity, communication cost, banks, municipality fees,,,,etc. Unforeseen expenses & risk (3-5%) Insurances Taxes as income tax, V.A.T, Profit (7-10%)