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Chicago Ridge, IL, United States

McDermit D.C.,Turner Construction Company | McDermit D.C.,Microsoft | Shipp D.D.,Eaton Electrical Group | Dionise T.J.,Eaton Electrical Group | Lorch V.,Eaton Electrical Group
IEEE Transactions on Industry Applications | Year: 2013

During commissioning of a large data center, while switching medium-voltage circuit breakers without any appreciable load, several potential transformers failed catastrophically. A detailed investigation, including a computer simulation, was performed. Ferroresonance produced by switching transients associated with opening and closing the vacuum breakers was determined to be the cause. The analysis also determined that the close-coupled power transformers were also in jeopardy. Field inspections involving grounding improvements coupled with solution simulations were made. High-speed switching transient measurements were performed to verify the analysis and the surge protective device solution (arresters and snubbers). This paper walks the reader through problem recognition, simulation, field measurements, and solution implementation. Special focus will be made on the field measurement verification. © 1972-2012 IEEE. Source

Spitler L.E.,Turner Construction Company
22nd Annual Conference of the International Group for Lean Construction: Understanding and Improving Project Based Production, IGLC 2014 | Year: 2014

An abundance of research focuses on the collective performance and motivations of the TEAM in BIM coordination and execution. The team, however, consists of trade partners with different motivations and sophistication. Trade partners whose product is directly fabricated from 3D models, such as mechanical and steel contractors, are highly sophisticated in BIM. Their models tend to be accurate and vetted for constructability as their profitability depends on quick onsite assembly of prefabricated items. Trade partners whose work installation is not directly fabricated from 3D models tend to have less accurate models that are not vetted for constructability. Non-constructible elements included in BIM are waste as they do not bring value to the intermediate or end user. More perniciously, these models are a presentation of inaccurate information in a highly detailed form, leading to the perception of accuracy and the incorrect detailing of adjacent assemblies. This paper uses case studies of BIM implementation in the San Francisco Bay Area to analyze model accuracy and implementation by trade and identify best practices in team alignment. This analysis is used to propose a framework for enforcing model constructability based on the basic tenets the Last Planner System™. Beyond project controls, this paper investigates natural alignment of trade interest in constructible models. Specifically, if a trade partner's profitability is increased through the use of model-based layout or increased off-site fabrication, the model will consequently be more accurate, benefiting the larger team. Therefore, this paper also discusses the advantages of intrinsic motivation to reduce variability of trade models between coordination and the field, and proposes methods to achieve this future state. Source

Zech W.C.,Auburn University | Logan C.P.,Auburn University | Logan C.P.,Turner Construction Company | Fang X.,Auburn University
Practice Periodical on Structural Design and Construction | Year: 2014

To protect the nation's surface waters from sediment-laden discharge, the proper selection, design, application, installation, and maintenance of erosion and sediment control practices on active construction sites are imperative. These practices will be required to comply with new, stricter regulations applied by the EPA to control high sediment concentrations of storm water discharge from construction sites. One mean of controlling sediment-laden discharge is through the use of sediment basins. The purpose of this paper is to report results from a survey conducted to determine the state of the practice for sediment basin design, construction, maintenance, and inspection techniques used by state highway agencies (SHAs) nationwide. The survey consisted of 68 possible questions in six categories: (1) background and experience, (2) design, (3) construction, (4) maintenance of sediment basins during construction, (5) inspection and monitoring, and (6) lessons learned. A total of 37 responses (74% response rate) out of 50 SHAs were received and analyzed. The summary of the survey, including lessons learned, allows knowledge and experience to be transferred to practitioners that may have little or no experience with using sediment basins on construction projects. The survey shows that the typical design life of a sediment basin is between 6 months and 2 years; the generally accepted minimum storage volumes among most agencies is 252 m3/ha (3,600 cu ft/acre) of disturbed area draining to the basin, and 13 agencies use flocculant additives to enhance the efficiency of sediment basins. © 2014 American Society of Civil Engineers. Source

Fang X.,Auburn University | Zech W.C.,Auburn University | Logan C.P.,Turner Construction Company
Water (Switzerland) | Year: 2015

A field-scale data collection plan to monitor and evaluate the performance of a sediment basin design was developed and implemented using portable automatic stormwater samplers, flow modules, a rain gauge, and inflow weirs. The design configuration consisted of a skimmer as the primary dewatering device, three coir baffles installed inside the basin, polyacrylamide flocculant blocks and ditch checks in the inflow channel. A sediment basin built on a highway construction site in Franklin County, Alabama, U.S. using the aforementioned design configuration was monitored over 16 rainfall events from 15 November 2011 to 6 February 2012. The basin effectively removed sediments during the early stages of construction when the correct type of polyacrylamide flocculant blocks was used, e.g., 97.9% of sediment removal after a rainfall event on 16 November 2011. It is difficult and challenging to dose sediment-laden stormwater inflow with an exact amount of flocculating agent across all runoff producing events since rainfall is a stochastic variable. Based upon results from this study, it is recommended that a minimum volume of 251.9 m3/ha of contributing drainage area be used to sufficiently size a basin, which is still significantly under-designed for a 2-year, 24-h storm event in the southeast. This paper presents challenges and lessons learned regarding sediment basin design, monitoring, and performance that are beneficial to future studies. © 2015 by the authors. Source

Jackson M.,Arup | Baykal B.,Turner Construction Company
Structures Congress 2014 - Proceedings of the 2014 Structures Congress | Year: 2014

The recently completed 40-story office tower at 250 West 55th Street in Manhattan demonstrates the best in innovative structural design and use of 3-D coordination tools for design and construction. This paper describes the integrated process that was followed and some of the challenges that were met along the way. It will be of interest to design professionals and others interested in integrated construction processes. The integrated 3-D process started with the use of Revit from the Schematic design stage, and was followed through the design, procurement, and construction phases, with all major sub contractors producing 3-D or 4-D models. These models were carefully integrated by the general contractor and enabled savings in the schedule, reduction of field conflicts, and reduced project risks. The progress of the project was complicated by a suspension of construction for two years after completion of the foundations. This paper describes some of the unusual steps taken to manage this process and allow for an accelerated schedule upon restart of construction. © 2014 American Society of Civil Engineers. Source

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