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<\/p>\nMaximizing the use of local timber and techniques with Archicad and BIMx in Japan<\/p>\n
A uniquely constructed, large scale timber structure wins the JIA (Japan Institute of Architects) grand-prix award.
\nIn 2014, the JIA Japan architectural award went to Yamaga City Yamaga Elementary school designed by Coelacanth K&H. Even for the architectural firm, which has received many prestigious awards and is a leading figure of the atelier architectural firms of Japan, this particular project was difficult and challenging. The supporting tools behind the creative work of the firm members, Kazumi Kudo and Hiroshi Horiba, the main architects, and other staff were Archicad and BIMx. We interviewed the architects, Kudo and Horiba, about this project.<\/p>\n
Yamaga city in Kumamoto prefecture is a lush provincial city that spreads out at the foot of the mountain range that runs through Kyushu from North to South. This region is known for its high quality \u201cAya\u201d cedar production, which is also used as the main material for the Yamaga City Yamaga Elementary School. \u201cAt first we were told to build it as a three-floor reinforced concrete structure,\u201d smiles Kudo. \u201cWe got involved with the project by responding to the call for proposals.<\/p>\n
The terms and conditions of the RFP mentioned the use of \u2018reinforced concrete structure\u2019 but there was nothing about timber use.\u201d
\nAccording to Kudo, the client\u2019s initial concern was that designing a large scale building with timber would be too difficult, especially with a project size requirement of almost 9,000 square meters (97,000 square feet). However, during their research, they learned that the project location is one of the best timber producing regions in the area.<\/p>\n
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\u201cIf that is the case, we thought we would propose to use the timber, and not laminated wood, but solid wood from logs. We wanted to take advantage of the timber production in the region,\u201d says Horiba. In fact, the architects had the experience of working on a 2,700 square meter kindergarten project, which was all built with timber a few years back in Fukuoka, Kyushu. Horiba and Kudo worked on the project together.<\/p>\n
\u201cBecause of the kindergarten project, we gained a certain amount of know-how building with timber. This gave us the confidence to take on the Yamaga elementary school project with a floor size of 8000 square meters,\u201d says Horiba, while Kudo nods in agreement. \u201cWe knew the benefits of using timber and the fact that it is not comparable to using reinforced concrete in terms of atmosphere created in the space, etc. In the case of the Fukuoka kindergarten project, since there was no local timber production, we had to use laminated wood. And this time, we wanted the challenge of using locally-sourced, solid wood.\u201d<\/p>\n
Coelacanth\u2019s proposal submission, including the idea of using timber, was selected from among many competitors. It was the beginning of their challenge with trial and error.<\/p>\n
Looking at the Yamaga plan, the first impression is the beautiful row of buildings with gabled roofs. However, if you look closely, you will notice the uniqueness of the positioning of the buildings. The area is divided into three parts from the south to the north. The north side block includes the gymnasium, music hall, library, home economics room, catering building, etc. After the path called the \u201cRoad of Learning,\u201d the middle block has two-story upper-grade classrooms, a stair-room called \u201cStage of Expression\u201d and management buildings. On the southern side, buildings such as flat-roofed lower-grade classrooms, crafts, life science study rooms and special support classrooms surround the inner-yard called the \u201cField of Learning.\u201d The playground is located on the east side of the building area. Interestingly, the \u201cRoad of Learning\u201d is open to the public and used by the citizens freely. The original school building had a loophole much like a public road, and the residents were used to it.<\/p>\n
\u201cOriginally, the school\u2019s site had the feeling of openness including a direct connection to the neighboring shrine without a fence, so we emphasized this openness and connection to the neighboring area in our plan. We organized the path, which was previously mixed with vehicles and pedestrians, and made this into the \u201cRoad of Learning.\u201d We tried maximizing the already existing elements by reorganizing them.<\/p>\n
And, there were special regulatory measures to be considered because of the timber use. \u201cTimber structures need to be separated from each other in case of fire and the fire protection area must be provided. We found the solution in the idea of the\u201cRoad of Learning\u201d and the \u201cField of Learning.\u201d We used the restrictions on wooden structures to our advantage and created the original learning space in the proposal.\u201d<\/p>\n
The architects connected this idea to the traditional culture. As they discussed with the teaching staff and the residents, the subject of the \u201cYamaga Lantern festival,\u201d the largest event of the city, came up as a topic. The event takes place in the schoolyard. It was difficult to ensure enough space for more than 1000 dancers who would stand next to the school and enter the yard in rows.<\/p>\n
Coelacanth K&H diligently listened to the opinions of the locals and incorporated them into the planning stage. After several such exchanges, they integrated the needs of the history and culture of the local area into their plan. Clearly, the key point of such a workflow is the communication with the staff, the client and locals. This uniquely creative way of communication is supported by GRAPHISOFT\u2019s Archicad and BIMx.<\/p>\n
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\u201cCoelacanth is known as a design office that creates large physical architectural models. That\u2019s because we started the office with six members from the research department from the same university.\u201d<\/p>\n
Until recently, it was not very common to use physical models in the initial design phase. Coelacanth, on the other hand, from the very beginning put the emphasis on making the entire mass model for volume analysis, as well as partial models, and this effort resulted in high quality team design. An architectural model can be a communication tool that enables creativity in collaboration. This is true with all clients, consultants, and local residents. In other words, for those who do not have the expertise in architecture, a physical model is a much better communication tool than 2D drawings. The development of this idea brought 3D CAD such as Archicad to their set of design instruments.<\/p>\n
\u201cEspecially when the structure and the design are very much connected to each other like in this project, some parts cannot be expressed with the physical model, and the model itself would be a burden. I\u2019m not saying it is impossible, but without 3D CAD like Archicad, it would have been very difficult.\u201d
\nIn normal cases, designing a large wooden structure takes longer than designing a reinforced concrete building. However, with the recent trend of shortening the construction period, it is not easy to ensure enough time for design either.<\/p>\n
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The effect of introducing Archicad and BIMx into the workflow can clearly be seen in the previously mentioned \u201cRoad of Learning\u201d and \u201cField of Learning,\u201d which are the main elements of the proposal. For example, the \u201cField of Learning\u201d may look like just a plan with many courtyards, but in fact, this space between the two school buildings has been considered and designed as part of the learning space.<\/p>\n
\u201cUsually, these yard spaces are facing the classrooms so they are not easily accessible, so on the side facing the yard, we placed an open space that you could go in and out of freely. This made the space available for playing and for studying. In fact, currently they use this space for observation learning and other outdoor learning activities as we intended in the design.<\/p>\n
Even such concepts, which are difficult to describe in words, the design intent could be accurately communicated visually using BIMx. Consequently, the architects could listen to the very practical comments of the users.<\/p>\n
Such use of Archicad and BIMx was not only for the benefit of the client, but also used widely for other technical engineers and construction staff. Given the technical challenges of designing and building the timber structure, Archicad played a huge role. One of the notable examples became the characteristic of this project \u2013 they ended up inventing a brand new wooden structure framework, which enabled them to create large indoor spaces.
\n\u201cOne of the concepts was to use the locally-sourced \u2018Aya cedar\u2019 timber instead of laminated lumber. However, even here at the local production area, thick and long logs are very expensive. We also believed it would not be a good idea to put such large and heavy timber above the children. So, we had the idea of using the 105mm diameter timber used as columns in conventional homes. It was an unprecedented and unique approach by Coelacanth, but to put it into practice was challenging. For such a large wooden structure, the size of the timber seemed too thin to support the school building\u2019s large roof, as well as the eight meter span of a classroom. The idea was modeled in BIMx, which was passed on to the structural engineer for analysis; the suggestions from the structural engineer were also added to BIMx. This process was repeated for further development. From this true collaboration between the architects and the structural engineers, the innovation of this new timber structural frame was born.
\nEven in Japan, not many would recognize the name \u201cNankin Tamasudare structure.\u201d This name comes from one of the street performances aired during New Year\u2019s on an old TV show. The performers sing and dance and turn the bamboo blind into many shapes by extending it in slanted directions. Similar to this \u201cNankin Tamasudare\u201d performance, this new structure is also about having many small sized timbers (105mm in diameter) of which each timber is slightly displaced from the other and extended radially to support the roof in an arch.<\/p>\n
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\u201cWith this new timber structure, it was not a problem to span an 8 meter classroom with timbers only 105mm in diameter. For the bigger space of the gymnasium, we had to use 240mm sized timbers, but we used the same structure there,\u201d says Horiba.<\/p>\n
The advantage of this Nankin Tamasudare Structure is not only that it can cover the span of 8m with ordinary timber, but it also compliments the original beauty of natural timber. If you use reinforced concrete to make a box shape, it only becomes a box, but if you frame it with wire rods, sometimes truly beautiful design is achieved. The Nankin Tamasudare structure technique surely brings out the beauty of such wire rods.<\/p>\n
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\u201cFor the Yamaga Elementary school project, from a normal classroom to the gymnasium, altogether nine variations of the Nankin Tamasudare beam structure were designed for different purposes. The development of these was not simple, and the problem that arose was how to process the wood and how to construct them. Since there has not been any precedence of such a structure, it was important to make the carpenters understand what exactly a Nankin Tamasudare structure is. Therefore, before the construction started, they invited the representatives of seven to eight local constructors, and together they created a mock-up of this particular structure. Given the fact that the carpenters had never worked on such a structure using such an extraordinary construction method, there were some craftsmen who couldn\u2019t hide their concerns.<\/p>\n
\u201cAt first I could tell that they were thinking \u2018isn\u2019t it impossible?\u2019 They must have thought, \u2018what could they possibly be thinking of building?\u2019 But after we started to construct it, it was smoother work than they thought it would be. Of course, it\u2019s not easy, but once one module is fixed, they just need to repeat the same,\u201d says Kudo. BIMx, along with the physical model, played a large role when communicating with the carpenters in the early phases as well as during the construction. In fact, once the work started to go smoothly, the carpenters became much more positive about the outcome.<\/p>\n
\u201cIn the case of this structure, even when the construction is finished, it can always be seen. It will not be hidden behind the ceiling, so for the carpenters it is meaningful that their beautiful work will be appreciated by the users of the building. Once the structures became gradually visible, they understood this, and the atmosphere of the work environment became better and better,\u201d says Horiba. It is not only about using the local timber \u2014 there is another important meaning \u2013 says Horiba.<\/p>\n
The Yamaga Elementary school that was built by local carpenters and construction companies using locally-sourced timber has been praised by the client, Yamaga city, as well as by the users such as the teachers, school children and the area residents. As the architects, Kudo and Horiba, had intended, the children actively use the open space for learning and playing in the \u201cField of Learning.\u201d In the evening of Obon (beginning of August) 1000 dancers with lanturns walk on the \u201cRoad of Learning.\u201d Yamaga elementary school has already become an integral part of the town, illuminating the beautiful scenery and their everyday lives.<\/p>\n
Coelacanth K&H Architects creates architecture that exists as a background of people\u2019s activity and not as a monument.
\nThe firm is committed to making the most of the available conditions such as light, wind, land, and urban environment, and to pass the history of humans and the place onto the future.
\nThe firm believes that a keen observation of the present condition is essential in order to not miss important signs. Much like archeologists discover the past from tiny clues, the architects read the fragments that hold the key to designing a new space.<\/p>\n
GRAPHISOFT\u00ae<\/sup><\/a>\u00a0ignited the\u00a0BIM<\/a>\u00a0revolution in 1984 with\u00a0Archicad\u00ae<\/sup><\/a>, the industry first BIM software for architects. GRAPHISOFT continues to lead the industry with innovative solutions such as its revolutionary\u00a0BIMcloud\u00ae<\/sup><\/a>, the world\u2019s first real-time BIM collaboration environment;\u00a0and\u00a0BIMx\u00ae<\/sup><\/a>, the world\u2019s leading mobile app for lightweight access to BIM for non-professionals. GRAPHISOFT is part of the\u00a0Nemetschek Group<\/a>.<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":" Maximizing the use of local timber and techniques with Archicad and BIMx in Japan Yamaga Elementary School A uniquely constructed, large scale timber structure wins the JIA (Japan Institute of Architects) grand-prix award. In 2014, the JIA Japan architectural award went to Yamaga City Yamaga Elementary school designed by Coelacanth K&H. Even for the architectural<\/p>\n","protected":false},"author":1,"featured_media":3417,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[133],"tags":[],"class_list":["post-3416","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-du-an-tren-the-gioi"],"yoast_head":"\n