Hello everyone, and thank you to give me a chance to presentation in this meeting.
I’m Masaki Muto from Building Research Institute in Japan.
I’d like to talk about “Industrialization and informatization process of housing production in Japan and expectation for OPENBIM”
This is today’s topics.
The 1st topic is practical cases to improve productivity and quality of housing production in Japan before BIM.
As you know, Japanese housing manufacturer tried productivity and quality improvement by prefabrication from 1960’s that is the rapid growth era in Japan. That initiative made a result of appearing large housing industry companies.
As the times advanced, in the 2000s, information technology is well developed and is used easily by every people. Under the such underground, small housing builder tried to productivity and quality improvement of their works by using IT.
I’ll show you these cases in this presentation.
The 2nd topic is expectation for OPEN BIM.
Japan had already such achievement before appearing BIM, so the motivation of BIM implement on their work are spoiled or shrinked in Japanese housing industries, I think. I’ll talk about expectation and concern for OPEN BIM technology under the such background.
At first, I‘ll talk about Practical cases to improve productivity and quality of housing production in Japan before BIM
And about Productivity and quality improvement of prefabricated housing developed after the rapid growth era in Japan, …
This note is the survey report by Dr. Togo, he is former CEO of Daiwa house Industry Co. Ltd,. that is colleagues of JUDANREN, published by National Museum of Nature and Science.
He is marked that Japan is the only country to get the primary new method for building low-rise detached houses by prefabrication.
And he also indicated that the prefabricated method has the system that values performance and quality.
This is the case of such system as you already know, Sekisui House’s 3D CAD System that established in 1972.
这是一个你们已经知道的系统的例子，Sekisui House的3D CAD系统建立于1972年。
Sekisui House is one of the major housing industry company in Japan, other housing industry companies that join JUDANREN also have similar system of Couse. I’d like to say in this slide, Japan companies were already got the integrated system of imfoematized housing design and consruction system as same as BIM is nowadays.
The system is established not only software environment but also proper supply chain.
In the Prefabricated housing production, the structural or wall systems, using parts were designated to their original system, and Project and Logistics managements is operated under the closed Data Base.
This closed environment is secure their Quality Assurance, so building authority certificate these systems, the system get an advantage over conventional housing production.
The closed system is not only good thing. They have a necessity to maintain a huge amount of model data with the company’s responsibility. This situation occurs form e difference of life between information model and real housing element. The real celling light has 20 years life, for example, if maintain the information of this light until the end of real life, because of information life is not longer than real life, so huge effort is required to maintain information traceability guarantee.
Approach to productivity and quality improvement of conventional housing production by information technology in 2000’s
This case is an approach executed by Kagoshima Kenchiku Ichiba. Kagoshima is the souse-east end part of Japan well known for Sakurajima volcano and hot spa area. Ichiba means the market. Kagoshima Kenchiku ichiba oriented open market of procurement for building resources..
Kagoshima kenchiku ichiba has 5 aims as shown;
Reduction of accumulated costs by outsourcing by using the CAD center for making volumes, making estimates, and integrating.
Cost reduction through joint ordering, and maintaining quality by securing stable orders.
Reduction of management cost by network process management
Improve quality of housing performance by making process control transparent.
Reduce advertising costs and increase opportunities for orders by the joint virtual show space on the Web.
This figure shows the diagrams of Kagoshima Kenchiku Ichiba‘s working procedure.
Kagoshima Kenchiku Ichiba’s Key is the CAD Center as Data Certer of itself.
Home builders engaged kagoshima kenchiku ichiba share the Design CAD system like as Saas which mean Software as a service system,
Cad Center has a openbook for procurement of building material or laboowork, Cad center executes schedule and cost controle like as 4D and 5D BIM function.
And Cad Center controlled also synchronized delivery.
Furturemore, Web cam is setteled at construction site, 24hours 7days monitoring is done in order to make sure its construction work quality.
The whole system is implement under intranet environment, and they were worked as one virtual enterprise.
One important thing of this system is that this system is Integrated Design & Production System by combining commercial Software and IT.
This is the face page of The Gemba katoku DB. It looks very simple and unbearable as you think so.
Unfortunately, Kagoshia kenchiku ichiba system did not last long.
不幸的是，Kagoshia kenchiku ichiba系统并没有持续太久。
The reasons of end of the system are 2points as Dr Shiino said.
1st reason is a lack of recognition of customer, in other words, failure of marketing.
Dr. Shiino said that….
The 2nd reason is Increase of burden due to expansion of construction market because of self build systems.
Dr. Shiino also said that..
It did not have the financial ability to hold it until it got on track.
In the process that the “KenchikuIchiba” that began in Kagoshima expanded with Osaka, Kumamoto, Aichi, Fukushima, Shizuoka, Kochi, Hiroshima and Hyogo, it was noticeable to the regional diversity of needs for housing it is. Although It was doing its utmost to respond to that, it was a heavy business launch.
Kagoshima Kenchiku Ichiba system is baned, but the success of this system encouraged other parties,. After that, many similar system or service environment appeared, and that contributes to the quality and productivity improvement of conventional wooden houses. In these days, some uses BIM instead of CAD, too.
Any way, Let go the next topic the expectation for OPEN BIM.
There are common expectation for BIM as showing I think.
Cost reduction of software environment improvement by using commercial software
Improve operability of acquisition and maintenance of model data by open format
Acceleration of technology development speed, Improvement of early applicability of new technology
E.g. VDC, DfMA, AI, IoT, xR(VR, AR, MR) on Open BIM Platform
These issues are under discussing on buildingSMAT that is organization for standardization of OPEN BIM. To provide efficeant developing environment by using OPEN BIM is strongly common expectation of all scale housing industry I bereave.
It is also a matter of concern for OPEN BIM.
Ist concern is that “Does CDE replace Integrated Design & Production System already developed?”
2nd example is that “Who is responsible for creating BIM object model data and ensuring that its survival is guaranteed throughout its lifetime?”
The 3rd example is that “Is there any problem with the archiving of BIM data?”
This is the figure of enshurement digital document’s authenticity. PDF files has a method of digital archivement, PAdES-LT.
But IFCmodel file dosen’t have a method of digital archiving as like as PAdES for PDF fileformat.
The Idea for their solution is application of block chain as a verification method of authenticity independent of file format. However, there is no confirmation yet because this technology is under developing.
This is conclusionｓ my presentation..
Before the emergence of BIM, Japan has been using information technology and industrialization technology to rationalize housing quality and improve quality.
This approach is practiced not only in closed large-scale housing production but also in open and small-scale housing production and has been successful.
BIM has the potential to revolutionize these technology at a lower cost and faster speed with this approach.
On the other hand, there are some concerns about the reliability of the BIM data environment, especially the reliability of data archive.