Study on the decision making process and its integration by subcontractor in building production

在日本，很多关于详细设计和施工规划的决定都是在施工开始后做出或改变的。因此，每个决策过程都变得非常复杂和混乱，甚至决策者也无法完全掌握情况。在这种情况下，调整和向每个决策者清楚地展示整个方面是必要的，以便在决策过程中管理这种混乱的沟通。另一方面，近年来总包与分包商的关系发生了变化，分包商的作用越来越重要。因此，分包商经常做出重要的决策，总承包商和分包商之间的沟通是非常重要的。本研究通过对分包商的产品信息进行调查，揭示分包商的产品混乱状况，了解分包商的产品现状。在方法上，我们收集了某建筑设计事务所设计、承包商合资施工的办公楼施工现场的设计图纸和说明书，并对信息和沟通进行了分析，明确了产品信息的细节和存在的问题，并考虑了顺利进行产品设计的措施。接下来，我们明确了这些信息的结构，并通过数学运算对这些情况做出建模的方法。并运用该方法对日本建筑工程案例进行了分析。

It is usual in Japan that not a few decisions about detailed design and construction planning are made or changed after the construction begins. Thus each decision making process becomes so much complicated and confused that even its decision maker can't grasp the situation perfectly. In such a case adjusting and showing the whole aspect clearly to each decision maker is necessary to manage such a tangled communication in the decision making process.On the other hand, the relation between General Contractor and Subcontractors has changed, and the function of subcontractors has become more important in recent years. So subcontractors frequently make important decisions and it is very important that the communication between general contractors and subcontractors is made frequently.In this study, to reveal the confused condition and to understand the present condition of product of subcontractors, product information in subcontractors is surveyed. Methodologically, we collected design drawings and specifications of a construction site which is an office building designed by an architectural design office and constructed by a joint venture of contractors, and we analyzed the informations and communication to make clear the details and problems of product information, and the measures to smooth product design are considered. Next, we made clear the structure of these informations, and make a method of modeling to these situations through mathematical operations. And using this method, its case studies of building project Japan are analyzed.