No abstract

Requests for information (RFIs) are frequently used by the architecture, engineering, construction, and operation (AECO) industry to resolve doubts and inaccuracies and to request complimentary information. However, they can be inefficient due to the lag between issuance and response, generating delays and cost overruns. The building information modeling (BIM) methodology allows for the integration of information by using virtual models and facilitating the control and management of RFIs; however, the full potential of BIM is not being exploited. Therefore, this work aims to analyze the RFIs of 17 high-rise building projects in conjunction with the application of BIM for their mitigation. To achieve this, categories of RFI categories were identified, the issuance and response process was analyzed, the building projects’ RFIs were classified, the most frequent problems were identified, the BIM uses that would allow for a reactive or preventive action were identified, and, finally, the potential benefits of BIM use for the reduction of RFIs were analyzed. The research showed that the correct use of BIM applications focusing on RFIs allows for an effective information review, generating preventive or reactive management of problems. Thus, it is possible to identify the recurrent causes of RFIs and those specialties issuing the most RFIs, with the objective of mitigating RFI submission in construction projects.

ResumenEn la ventilación por extracción localizada aplicada a baños de tratamiento de superficies, el mejor elemento de control es aquel que permite el encerramiento total de la fuente emisora, siendo este procedimiento el punto de partida del proyectista para el diseño preliminar de la instalación. Ahora bien, la frecuente necesidad de introducir y extraer las piezas a tratar por su zona superior, mediante grúas móviles u otros dispositivos de carga, la reposición de los componentes del baño y la vigilancia por parte de los trabajadores, hace necesario que el acceso por dicha zona deba ser diáfano, imposibilitándose el encerramiento total. En consecuencia, deben eliminarse aquellos componentes que impidan llevar a cabo las citadas operaciones, recurriendo a la instalación de elementos de captación lateral. Otros inconvenientes del sistema, derivados del carácter omnidireccional de la aspiración, hacen necesario trabajar con elevados caudales para generar adecuadas velocidades de control en los dominios de los baños, por lo que no es aconsejable su implantación para longitudes superiores a 1,20 m. Por otro lado, la complejidad mecanística de los flujos de aire involucrados aconseja el empleo de dispositivos experimentales que permitan la visualización de las diferentes corrientes de aire implicadas, utilizando gases trazadores para evaluar cuantitativamente su eficacia. En este trabajo se plantean, en función de las investigaciones llevadas a cabo, las bases del diseño de instalaciones de ventilación a escala real que permita estudiar en profundidad la influencia de las variables que condicionan la eficacia de captación. Palabras claveVentilación de tanques abiertos. Elementos primarios de captación local. Visualización de flujos. Trazadores de gas. Eficacia de captura. Evaluation of the performance of exhaust local ventilation systems in treatment surface tanks: Constraint of the facilities project AbstractIn the design of local exhaust ventilation systems for open surface tanks, the element of control that permits the total shutting in the source is clearly the best, being this procedure the starting point for industrial projector for the preliminary design installation. However, the frequent need of introducing and extracting the workpieces by their upper side through mobile crane or other load devices, the reinstatement components of the tank and the surveillance on the part operators, makes necessary that the access in such zone side be easy, being disabled the total encirclement. Consequently those components that prevent carry out the cited operations should be eliminated, appealing to the installation of local exhaust ventilation. Other inconvenients of these systems, derivated from the character omnidirectional of the aspiration, make necessary to opérate with high exhaust flows to genérate suitable speeds of control in the baths, therefore it is not advisable their installation for lengths higher than 1.20 m. On the other hand the complexity of the mechanism of the involved air flows advises the experi...