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Pages 63-85

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From page 63...
... 63   APDMs dier from the sequential DBB delivery approach, which is typically paired with a low-bid procurement method. Although APDM projects constitute less than 5 percent of the total number of projects let by a typical DOT, they can represent as much as 30 percent of a DOT's annual budget because they tend to be reserved for large projects (Antoine et al.
From page 64...
... 64 Systematic Approach for Determining Construction Contract Time: A Guidebook ranged from almost no design to nearly 90 percent design. Given that accurately quantifying the preconstruction contract time is highly project dependent, it is virtually impossible to empirically derive a generic methodology.
From page 65...
... CTD Guide for APDMs 65   is complete, the external constraints must be imposed before the nal contract time can be established for the APDM project. Figure 4-2 represents the proposed framework graphically and places the ve domains in two categories: domains that are controlled internally and domains that come from external factors.
From page 66...
... 66 Systematic Approach for Determining Construction Contract Time: A Guidebook of the rst work package can begin before the overall design is complete (see Figure 4-3)
From page 67...
... CTD Guide for APDMs 67   non-permanent structures. Although most DOTs interviewed for this research indicated that they allow contractors to perform early work, all of them unanimously emphasized that this should be done at the contractor's own risk.
From page 68...
... 68 Systematic Approach for Determining Construction Contract Time: A Guidebook Figure 4-5. Four-step procedure to determine preconstruction duration for APDM projects.
From page 69...
... CTD Guide for APDMs 69   4.4 Generic CTD Procedure for APDM Figure 4-6 presents a four-step generic CTD procedure to determine the overall contract time of APDM (i.e., preconstruction time and construction time)
From page 70...
... 70 Systematic Approach for Determining Construction Contract Time: A Guidebook Emerging technology. Not applicable.
From page 71...
... CTD Guide for APDMs 71   Sub-Step 2 -- Establish design work packages. • Identify design work packages that constrain the release of the first work package for construction.
From page 72...
... 72 Systematic Approach for Determining Construction Contract Time: A Guidebook Pros and cons. Not applicable.
From page 73...
... CTD Guide for APDMs 73   Sub-Step 3 -- Identify Preconstruction Activities and Milestones Preconstruction period design activities are those that take the design shown in the RFP and advance it to the point where the rst design work package is released for construction. It is recommended not to overcomplicate the preconstruction schedule by placing too many activities in this step, as it is meant to generate a high-level estimate given the limited amount of project information available at this stage.
From page 74...
... 74 Systematic Approach for Determining Construction Contract Time: A Guidebook Pros and cons. Not applicable.
From page 75...
... CTD Guide for APDMs 75   Sub-Step 4 -- Establish Preconstruction Activity Duration Unlike construction activities, the majority of preconstruction activities lack established production rates. is situation may be intimidating; however, by leveraging the right resources, along with some sound professional judgment, a reasonable duration estimate can be made.
From page 76...
... 76 Systematic Approach for Determining Construction Contract Time: A Guidebook The outcome of this step. Duration estimate for each preconstruction activity.
From page 77...
... CTD Guide for APDMs 77   Sub-Step 5 -- Determine Preconstruction Duration is sub-step involves sequencing the preconstruction activities on a timeline. e sequence takes into consideration the relationships (i.e., precedence)
From page 78...
... 78 Systematic Approach for Determining Construction Contract Time: A Guidebook The outcome of this step. A complete schedule (CPM or bar chart)
From page 79...
... CTD Guide for APDMs 79   Step 3 Determine Construction Period 4.4.2 Step 3 -- Determine the Construction Period e process used to determine the duration required for the construction phase of an APDM project is fundamentally similar to the process used to determine the construction contract time of a traditional DBB project. e few key dierences arise because an APDM project typically goes into the advertisement stage without full, detailed design information.
From page 80...
... 80 Systematic Approach for Determining Construction Contract Time: A Guidebook Step 3 Determine Construction Period Sub-Step 4 -- Calculate a duration for each activity. For a work item with quantity, the duration of the item is calculated by dividing the given quantity by the production rate estimated in the previous step.
From page 81...
... CTD Guide for APDMs 81   Step 3 Determine Construction Period The outcome of this step. A construction-schedule project duration estimate.
From page 82...
... 82 Systematic Approach for Determining Construction Contract Time: A Guidebook 4.4.3 Step 4 -- Determine APDM Contract Time is nal step resembles the CTD procedure for DBB projects, except that the project duration now consists of a preconstruction duration and a construction duration. Figures 4-20 and 4-21 provide details about the sub-steps for Step 4, and the overview presented in Figure 4-22 summarizes key aspects of this step.
From page 83...
... CTD Guide for APDMs 83   Step 4 Determine APDM Contract Time Sub-Step 4 -- Convert working days to calendar days. This step will be necessary if the preconstruction period and/or construction period have been calculated in terms of working days (usually the case when a bar chart is used)
From page 84...
... 84 Systematic Approach for Determining Construction Contract Time: A Guidebook Step 4 Determine APDM Contract Time The outcome of this step. Contract time to be specified on the RFP.
From page 85...
... CTD Guide for APDMs 85   4.5 Project Acceleration Strategies Based on interview ndings, most DOTs with APDM experience typically assume no project acceleration when developing the default CPM schedule. If project acceleration is deemed utterly necessary to meet an aggressive deadline, then dierent strategies can be used to compress the schedule.

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