ARCH 3013 Lecture Segment 12 Concrete Takeoffs INSTRUCTORS

ARCH 3013 Lecture Segment 12 Concrete Takeoffs INSTRUCTORS...

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ARCH 3013 ESTIMATING COURSE NOTES LECTURE SEGMENT #12 FUNDAMENTALS OF CONCRETE TAKE OFFS-CAST IN PLACE 1 2 PART ONE Four main categories: 1. Supply and placing the concrete 2. Construction and removal of the formwork 3. Supply and placing the reinforcing steel 4. Miscellaneous items associated with the work A quantity takeoff for concrete involves three basic tasks: 1. Installation and removal of forms 2. Installation of reinforcement ( rebar and wire mesh ) 3. Placement and finishing of concrete Cost of the concrete includes the material (C=A+ C + W) and the equipment to mix and to transport. Concrete batching and mixing plants san be on site when large pours are anticipated or a remote location, but most often are local companies. The installation of forms and rebar may occur in different orders. Price quotations: consider the following issues: 1. Does the concrete described in the quotation meet the specifications ? 2. What are the extra charges for special mixtures beyond Type I cement? 3. What are the extra charges for special cement additives ? 4. Are there charges for heat and cold weather extremes ? 5. Is there a premium if a small load is needed? 6. Is there a charge if the concrete delivery truck is held up during the unloading at the site? 7. Are their additional charges if the concrete has to be delivered outside of normal working hours ? 8. Are their charges for disposal of surplus materials and/or cleaning of the trucks due to government regulations? FORMS Forms and formwork may be bid by itemizing all the components of the forms, or they may be bid on the basis of square foot (most often used), the lineal foot, or a set of forms. Using SF, LF or sets means that you are looking at historical data. The estimator must be familiar with the forming system to be used. Beams, girders, walls and tall footings ( 12” high) are most often bid based on SF of forms needed to form the concrete member. Make sure to include the forms on the sides and bottom (if needed) Short footings (< 12” high) can be formed using 2x10’s and 2x 12’s. They are normally bid on a lineal footage of forms. Columns often are bid on square footage basis (square and rectangular columns only). Estimators must determine not only the quantity of the forms to be installed, but also the quantify of form materials to be purchased as this effects the cost. Considerations are as follows: 1. How many times can the forms be re-used? (on this project) 1 Chapter 11 (pages 221-257); Fundamentals of Construction Estimating 2 nd Edition; Author: David Pratt; ISBN# 1-4018-0959-6 2 Chapter 5 (pages 87-120; Construction Estimating Using Excel; Author: Steven J. Peterson; ISBN# 0- 13-171983-16 1
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ARCH 3013 ESTIMATING COURSE NOTES LECTURE SEGMENT #12 2. Can these forms be used again but on another project? (Or, are there forms from another project that could be used on this project?) 3.
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ARCH 3013 Lecture Segment 12 Concrete Takeoffs INSTRUCTORS...

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