Research Trends and Results

Development of Material/Framing Knowledge BaseRegarding Design Specifications of Existing
Detached Timber Housing
TAKAHASHI Satoru, Research Coordinator for Housing Warranty,Housing Department
MORI Masashi, Head, Housing Planning Division
NUNOTA Ken (Dr. Eng.), Head; NAKAGAWA Takafumi (Dr. Eng.), Senior Researcher
Housing Production Division, Housing Department(Key words) Existing housing, Detached timber housing, Material framing method
1. Foreword
The Ministry of land, Infrastructure, Transportand Tourism has been carrying out existing longterm quality housing promotion projects or thelike slated for a series of policies for existing
housing distribution promotion/stock renewal.
With respect to existing housing, NILIM has been
carrying out the development for technology toreadily comprehend its materials and framing andso forth and evaluate its performance efficiently;
even in a case where there is no data such as
drawings or the like. This paper reports thedevelopment of a material/framing database inregard to designing specifications of existing
detached timber housing.
2. Acquisition/accumulation
ofmaterial/framing data
Over about 30 years we have carried out
research for design survey specifications,targeting existing housing for which housing
construction operators with supply results ofpublic financial loan housing capable of acquiring
data such as drawings. In the method of research,
researchers browsed the stored drawings,
extracted descriptions indicating materials andframing methods and recorded data related to
employ actual conditions of framing method or
the like according to age brackets. In three yearsof research from 2011 to 2013, we have obtained
actual data in regard to 1,247 cases of housing by
55 operators in total, from Hokkaido, Tohoku,Kanto, Chubu, Chugoku and Kyushu.
3. Improvement of materials/framing
database
Acquired data was arranged according tohierarchical definitions, looking into layercomposition of foundation and exterior walls,
roofs, openings or the like on a regional basis,from the surface (visible part) to interior (invisiblepart). Although to make descriptions of drawings
or the like in data for housing was intended
according to changes in a chronological order, it
was presumed from the beginning that

information not described in drawings would beplentiful as it was customary to refer to common
specifications in building design. Accordingly, forthe documents of specifications of the former
Public Loan cooperation which had also beenreferred to in designs for timber housing, weanalyzed them in descriptions in respect tospecifications for each year in the targeted period
of design specification research and carried out asimilar arrangement. Moreover, with reference tooperators for whom cooperation was not obtained,
we carried out interviews for items incapable ofcorroboration by descriptions on drawings or thelike. s.
According to these operations, we integrated thedata obtained by research in three years, making
districts where housing was located, years ofconstruction or the like searching conditions,assuming a combination of materials/framing
method, and have experimentally produced amaterial/framing method which assumes/indicatesa combination of material/framing methods
considered to have been general in each
district/generation.
4. Deliberation issues in the future
Deliberating indication method for informationand operation methods to readily be utilized inpractical businesses in actual research for existing
housing and operating method for databasesystems, we are prepared to establish this method.
[Reference]
1) Comprehensive technology development project
Development of capability evaluation technology forexisting housing or the like slated for existing housing
distribution promotion/stock renewal (2011 – 2014)
http://www.mlit.go.jp/tec/gijitu/kaihatu/pdf/soupro011.
pdf2) Research on grasp method for material/framing
method of existing timber housing (-1) (-2),
Architectural Institute of Japan Convention forfiscal 2013 (Hokkaido) Academic Speechsynopses collection 5487 – 88, pp997 – 1000.
2013. 8