Viaduct segment
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The document provides an estimate for precast viaduct segments. It discusses the purpose of cost estimation, which includes determining necessary funds, materials requirements, labor needs, and construction scheduling. Data required for an estimate includes drawings, specifications, and rates. A viaduct is defined as a bridge composed of several small spans. Precast viaduct segments are cast in approximately 2.5 meter sections weighing up to 55 tons and are assembled between piers using a launching girder. The process of precasting involves placing molds, installing rebar, pouring and vibrating concrete, and curing the segments before lifting.
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specification estimation and valuation of a building
The document discusses different types of estimates used in construction projects. It defines estimation as calculating quantities and costs of items required to complete a project. The main types discussed are:
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Viaduct segment
- 1. COST ESTIMATION OF PRECAST VIADUCT SEGMENT • Prepared by- • Navneet singh(pp14062) • Ashish jain(pp14110)
- 2. ESTIMATION Estimate is a calculation of various items of an engineering works so as to know its approximate cost and quantities of various kinds of materials required with labour involved for its satisfactory completion.
- 3. Purpose of Estimation 1) To ascertain the necessary amount of money required by the owner to complete the proposed work. 2) For public construction works, estimates are required in order to obtain administrative approval, allotment of funds and technical sanction. 3) To ascertain quantities of materials required in order to program their timely procurement. 4) To calculate the number of different categories of workers that are to be employed to complete the work within the scheduled time of completion. 5) To assess the requirements of Tools, Plants and equipment required to complete the work according to the program. 6) To fix up the completion period from the volume of works involve in the estimate. 7) To draw up a construction schedule and program and also to arrange the funds required according to the programming. 8) To justify the investment from benefit cost ratio. (For ideal investment, this ratio should be more than one). 9) To invite tenders and prepare bills for payment. 10) An estimate for an existing property is required for valuation.
- 4. DATA FOR ESTIMATE DRAWINGS SPECIFICATION RATES
- 5. VIADUCT • Is a bridge composed of several small spans. • Derived from latin word via for “road” and “ducere” to lead. • A viaduct is thus a bridge spanning in the order of 50m between piers. • Gautrain route with the longest spanning 650m.
- 6. VIADUCT SEGMENT • Viaduct Segments are cast in sections of about 2,5m in length. • Weigh up to 55 tons and assembled by means of a launching girder between piers. • Formed by several stages.
- 7. PRECASTING OF VIADUCT SEGMENT • Mould are placed in position. Check the level and flatness. • Rebars are cut and bend as per bbs. • Bars are tied with binding wire. And than its lifted up and put in position in mould. • Concrete is poured using pump. And than is vibrated with shutter vibrator and needle vibrator • Wet Curing is done for 7 days. Moist curing by sprinkling water for 14 days. • De shuttering is done. • Segment is lifted with gantry crane through lifting holes.