Project Management for Construction: Cost Estimation. Costs. Associated with Constructed Facilities. The costs of a constructed facility. Each of these major cost categories consists of a number. The owner is interested. For example, land. The large expenditures needed. In Chapter 6, we shall deal. 250 E Wilson Bridge Rd Worthington OH. Turner Construction Company is one of the leading companies. Turner Construction Company provides a variety of supply chain. BYU Career Services (Bridge) Linked-In; Learning Outcomes; Graduate Program. Brochure; Graduate Course Description; Alumni. Construction Management; Whiting-Turner Intern; Whiting-Turner Intern. It is at this stage that tradeoffs between operating and capital costs. To build several projects of. A cost estimate establishes the base line. A cost. estimate at a given stage of project development represents a prediction. In microeconomics, the relationship between the. In construction, the production function may be expressed by the. A production function relates the amount or volume of. For example, the. Q may be derived as a function of various input factors. Thus, for a specified level of output, we may attempt to. The relationship between the size of a building project (expressed in. Several such production. Figure 3- 3 of Chapter 3. Empirical estimation of cost functions. TURNER-FAIRBANK HIGHWAY RESEARCH CENTER FHWA Bridge Research Update Meeting of the AASHTO Subcommittee on Bridges & Structures Austin, Texas July 8-12, 2012 Louis N. FHWA Office of Infrastructure R&D Team. Get reviews, hours, directions, coupons and more for Turner Construction Co at 250 E Wilson Bridge Rd Ste 200, Worthington, OH. Search for other Construction Consultants in Worthington on YP.com. NATIONAL BUILDING MUSEUM BRIDGE BASICS PROGRAM KIT. ![]() Bridge and Structures Design and Construction R&D addresses. The Long–Term Bridge Performance (LTBP) program is a 20+ year research program to develop data and knowledge to. Turner-Fairbank Highway Research.The role of statistical inference is to estimate the best parameter. Usually, this is accomplished. A unit cost is assigned to each of. Building a better rental car center. Turner Construction is creating convenience for ren Airport The. total cost is the summation of the products of the quantities multiplied by the. The unit cost method is straightforward in principle. The initial step is to break down or. Collectively, these tasks must be. Once these tasks are defined and. The level of detail in decomposing into tasks will vary considerably from. ![]() ![]() ![]() Allocations of cost from existing accounts. The basic idea in this. Ideally, the allocation of joint costs should. In. many instances, however, a causal relationship between the allocation factor and. For example, in. construction projects, the accounts for basic costs may be classified according. These basic costs may then be. The required levels of accuracy of construction cost estimates. Since design decisions made at the beginning stage of a project. Generally. the accuracy of a cost estimate will reflect the information available at the. In spite of the many types of cost. A. construction cost estimate serves one of the three basic functions: design, bid. For establishing the financing of a project, either a design. For the owner or its designated design. Screening estimates (or order of magnitude estimates). Preliminary estimates (or conceptual estimates). Detailed estimates (or definitive estimates). Engineer's estimates based on plans and specifications For each. For the contractor, a bid estimate submitted to the. The direct cost of construction for bid estimates is. For monitoring the project during. Budget estimate for financing. Budgeted cost after contracting but prior to construction. Estimated cost to completion during the progress of construction. At the very early stage. A preliminary estimate or. The detailed. estimate or definitive estimate is made when the scope of work is. The engineer's estimate is. In preparing these. The level of. detail in decomposing the facility into tasks depends on the type of cost. For conceptual estimates, for example, the level of. A screening estimate is made for each of the potential alternatives, such. As the bridge type is. When the detailed plans and specifications are completed, an. Some contractors have well established cost estimating procedures. Since only the lowest bidder will be the winner of the. Consequently, the. Thus, the general subcontractor will. If all or part of the. For example, the cost of a footing of a certain. However, the. contractor may want to assess the actual cost of construction by considering the. Hence, items such as. For the owner, a budget. Consequently, the detailed estimate is often used as the budget. As the work progresses, the. A revised estimated cost is necessary either because of change. The budgeted cost should also be updated periodically to. The. seal is constructed by pumping or pressure- injecting grout under the existing. Holes are bored at regular intervals throughout the landfill for. A layer of soil at a minimum of 5 ft. The grout liner can be between 4 and 6 feet thick. This grout would then harden into a. The quantities for these two items are. As an approximation, use 3. The number of bore holes in a 5. Hence, the total. Thus, for a 4 ft soil layer. The unit cost for drilling exploratory bore holes. Thus, the total cost of boring will be between (2,8. The unit cost of Portland cement grout pumped into. In. addition to the variation in the unit cost, the total cost of the bottom seal. That is. for a 4 ft layer with 2. The total cost of drilling bore holes. Furthermore, the range of unit cost varies. Alternatively, additional soil tests. Suppose that, in addition to ignoring the. Portland cement. grouting. In this case, the total project cost is estimated to be. An important point to note is that this screening. Example 5- 3: Example of engineer's. Bids were submitted on March. The three low. bidders were. Ball, Ball & Brosame, Inc., Danville CA$1. National Projects, Inc., Phoenix, AR$1. Kiewit Western Co., Murray, Utah$1. It was astounding that. Even the third lowest. The disparity. in pricing can be attributed either to the very conservative estimate of the. Utah Department of Transportation or to area contractors who. The similarity of their unit prices for some items and the. Costs do not. always vary linearly with respect to different facility sizes. Typically, scale. If the average cost per unit of capacity is. Conversely, scale diseconomies exist if. Empirical data are sought to establish. Then, a linear cost relationship can be expressed. In general, this relationship is applicable only. If the. values of y corresponding to x = c and x = d are known, then the cost of a. For example, the construction cost of a school building. Taking the logarithm of both sides this. Figure 5- 3: Nonlinear Cost Relationship with increasing or Decreasing. Economies of Scale. Although. no fixed cost is implied in Eq.(5. The same limitation applies to Eq.(5. A nonlinear. cost relationship often used in estimating the cost of a new industrial. Let yn be the known cost of. Qn, and y be the estimated cost of. Q. Then, from the empirical data, it can. A. value of m = 0. The exponential. rule can be reduced to a linear relationship if the logarithm of Equation (5. For (Q/Qn) = 1 or ln(Q/Qn) = 0, ln(y/yn). Q/Qn = 2 or ln(Q/Qn) = 0. Since m is the slope of the line in the figure. Q/Qn is 2. In words, for m = 0. Example. 5- 5: Cost exponents for water and wastewater treatment plants. When m is small, there is considerable incentive. Figure. 5- 3. When m is close to 1, the cost is directly proportional to the design. The value of m tends to increase as the number of duplicate units in. The values of m for several types of treatment plants with. Table 5- 3. TABLE 5- 3 Estimated Values of Cost Exponents. Water Treatment Plants. Treatment plant type. Exponent m. Capacity range (millions of gallons per day)1. Water treatment. 0. Waste treatment Primary with digestion (small)0. Primary with digestion (large)0. Trickling filter. Activated sludge. Stabilization ponds. Source: Data are collected from various sources by P. M. See the references in his article for the primary. Example 5- 6: Some Historical Cost Data for the Exponential Rule. The exponential rule as represented by Equation (5. K are known for a given type of facility, then the cost y for a proposed. Q can be readily computed. TABLE 5- 4 Cost Factors of Processing Units. Treatment Plants. Processing unit. Unit of capacity. K Value (1. 96. 8 $)m value. Liquid processing Oil separationmgd. Hydroclone degrittermgd. Primary sedimentationft. Furial clarifierft. Sludge aeration basinmil. Sludge handling Digestionft. Vacuum filterft. 29,3. Centrifugelb dry solids/hr. Source: Data are collected from various sources by P. M. See the references in his article for the primary. The estimated values of K and m for various water and sewage treatment plant. Table 5- 4. The K values are based on 1. The. range of data from which the K and m values are derived in the primary sources. For a proposed new plant with the primary sedimentation. The unit cost for. This concept is applicable to both design estimates and. The project is decomposed into major. The project is decomposed into components of. The project is decomposed into detailed items. Examples of. detailed items are slabs and beams in a floor panel, or the piping and. For bid estimates, the unit cost. Subcontractor Quotations. The decomposition of a project into. However, the accuracy of the resulting estimate depends on. The decomposition of a project into items of. The levels of detail may. If the construction procedure of a. Simple Unit Cost Formula. Suppose that a project is decomposed into n. Let Qi be the quantity of the. Then. the total cost of the project is given by. Based on characteristics of the construction site, the. Usually, an. industrial process requires several major equipment components such as furnaces. The total cost of a project is. Let Ci be the purchase cost of. Then, the total cost of a project is estimated by. The. factored method is essentially based on the principle of computing the cost of. The value of Ci may be obtained. Equation (5. 8) may involve a. Let Qi be the. quantity of work for task i, Mi be the unit material cost of task i. Ei be the unit equipment rate for task i, Li be the units. Qi, and Wi be the wage rate. Li. In this case, the total cost y is. Wi. Li yields the labor cost per unit of Qi. Consequently, the units for all terms in. Equation (5. 9) are consistent. For. a design estimate, the decomposition of the project into footings, foundation. TABLE 5- 5 Illustrative Decomposition of. Building Foundation Costs. Design elements. Contract elements. Formwork. Rebars. Concrete. Total cost. Footings$5,0. 00$1. Foundation walls. Elevator pit 9,0. Total cost$2. 9,0. Example 5- 8: Cost estimate using labor, material and equipment rates. For the given quantities of work Qi for the concrete. Table. 5- 6, the cost estimate is computed on the basis of Equation (5. The result. is tabulated in the last column of the same table. TABLE 5- 6 Illustrative Cost Estimate Using.
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