การวิเคราะห์เงื่อนไขในการก่อสร้างบ้านพักอาศัยโดยใช้ชิ้นส่วนเสาและคานคอนกรีตสำเร็จรูป และผนังไฟเบอร์ซีเมนต์กลวง : กรณีศึกษาโครงการพิมานชล 2 เฟส 3 จ. ขอนแก่น / ดนุชา สุนทรารชุน = A conditional analysis in housing construction utilizing precast concrete column and beam components with extruded fiber-cement wall panel : a case study of Pimarnchon II, phase 3, Khon Kaen Province / Danoocha Sundararjun
To find appropriate conditions for prefabrication in housing construction, in a case study of the use of precast concrete columns, beam components and extruded fiber-cement wall panels. The research focuses on the manufacturing procedures, construction, problems in construction, preventive and corrective measures, cost summary and a comparison with the conventional construction methods. The research sample is a two-storey detached house with a 126 square-meter functional area in Pimarnchon 2 Housing Project, Phase 3, Khon Kaen province, where houses of the same type have been built using conventional construction methods. Research methods included observations, note taking, interviews and photography, from start to finish of construction. Data record forms and cameras are research tools. The research found that manufacturing and construction stages in prefabrication are different from conventional ones. Technology has been developed to reduce the amount of work on construction sites. Major problems faced during construction include lack of quality control, strict control in the stages of manufacturing and transportation of prefabricated parts, precast concrete columns and beam components not being up to standard, breakage of parts (0.18%) and damage of prefabricated stairs (8.69%). The cost of prefabricated housing construction is 923,560.80 baht (7,330 baht/sq.m) while with conventional methods the cost is 890,065.36 baht (7,064 baht/sq.m). Prefabrication construction time is 77 days (two months and 17 days) while conventional construction takes 112 days (three months and 22 days.) From this study, it can be concluded that there are some important conditions required when using precast concrete columns beam components and extruded fiber-cement wall panels. These include mass production, repetition, management and technical expertise in construction. The prefabrication method is more complex than the conventional method. It also involves different stages and procedures from manufacturing components to installation at construction site. It requires effective management and technical expertise both in manufacturing and construction or problems will result. To prevent problems from arising, it requires planning, careful checking and use of technical methods or high precision equipment to reduce human error. The construction cost of the prefabrication method is 3.76% higher than that of the conventional method. However, construction time and labor are reduced by 31.25% and 25.15%. respectively. It can therefore be concluded that the prefabrication method, using precast concrete columns, beam components and extruded fiber-cement wall panels is possible provided that there is mass production, repetition, effective management and control of manufacturing and construction, and technical expertise. It is thus suitable for a housing project in which houses of the same design are built in a large number. One of the advantages of the prefabrication method is that on site work is reduced as material manufacturing takes place of factories where there is better quality control. This leads to a reduction in construction time and the amount of labor required and, thus, labor cost. The disadvantages are the necessity for good management and control required by the complex techniques,skilled lacors and higher cost of construction materials.
