شناسايي معيارهاي انتخاب بين سيستم ساخت سنتي و بتني قالب تونلي در پروژه هاي انبوه سازي

To Identify the Criteria for Selecting between Traditional and Concrete Tunnel Form Systems for Mass- Housing Projects

استفاده از سيستم بتني قالب تونلي در انبوه سازي مزاياي قابل توجهي عرضه مي كند، با وجود بهره‌گيري از مصالح و تجهيزات مدرن در انبوه سازي و مشكلات اساسي در سيستم سنتي، هنوز سيستم‌هاي ساخت‌وساز عمدتاً سنتي است. تا به حال معيارهاي انتخاب سيستم ساخت به صورت كلي بوده است. در اين تحقيق، در پي مطالعات كتابخانه ‌يي و ميداني و مقايسه‌ي جامع بين دو سيستم ساخت، 23 معيار بر پايه‌ي زمان، هزينه، و كيفيت شناسايي شدند. جهت ارزيابي معيارهاي شناسايي‌شده، از شاغلان باتجربه در حوزه‌ي انبوه سازي از جمله كارفرمايان، مهندسان، و پيمانكاران نظرسنجي شد. تجزيه و تحليل نتايج مشخص كرد كه معيارها در 5 بعد دسته بندي مي شوند: هزينه‌ي اوليه، قابليت ساخت پذيري، هزينه‌هاي بلند مدت، اثر معماري و سازه. در ارزيابي معيارها با استفاده از آمار توصيفي و استنباطي، سيستم بتني قالب تونلي از نظر زمان، هزينه و كيفيت در كشور در شرايط بحراني كمبود مسكن و متقاضي زياد، قابل قبول تر ارزيابي شد. نتايج اين تحقيق مي تواند به ذينفعان اصلي حوزه‌ي انبوه سازي همچون دولت‌مردان، كارفرمايان و مشاوران در انتخاب سيستم مناسب ساخت در هنگام تصميم گيري كمك كند.

The use of concrete tunnel form system offers significant advantages in mass- housing construction, despite the use of modern material and equipments in mass- housing construction and fundamental problems with traditional method, mass- housing construction are still generally traditional. Then, it is being determined that; the criteria for selecting system in construction have been incomplete and general. Holistic criteria are needed to assist with the selection of an appropriate construction system in concrete buildings during early project stages. Because of this reason, the purpose of this research is to identify the criteria for selecting between the traditional and concrete tunnel form systems for mass-housing projects. Methodology selected for this research comprised of literature and field studies, questionnaire was designed; interviews were conducted with experienced practitioners in the field of mass- housing projects in Tehran province, and finally a statistical analysis of the survey was done. Following a literature and field studies a comprehensive comparison between two systems of construction, 23 criteria were identified based on time, cost and quality. To evaluate identified criteria a survey was conducted from the experienced practitioners in the field of mass- housing construction including owners, engineers, and contractors. For ranking the identified criteria a Liker scale of “High”, “High–Medium”, “Medium”, and “Medium–low” was selected. The analysis by using SPSS 18.0 revealed that the criteria are classified in five categories: initial costs, constructability, long-term costs, and the influence of architecture and structures. Three of these factors are under the economic category, and two other factors belong to the quality category. In evaluating the criteria using descriptive and inferential statistics, concrete tunnel form system in terms of time, cost and quality, were there is high demand and shortage crisis in housing is more acceptable. Results of research will help the main beneficiaries, including governments, owners and consultants in making appropriate decision for selecting the construction system.