INSIGHTS

2020.02.17

R&D WORKS Vol. 12

CLT relocation and reconstruction structural system

A relocatable wooden structure made using CLT.

R&D WORKS TOP

In recent years, there has been a renewed recognition of the importance of using domestic timber, and there is a demand for the development of structures that expand the scope of its use. Amidst this domestic need, this project was constructed in Harumi, Tokyo, as a temporary building in the city center to promote the potential of CLT wooden structures both domestically and internationally. The building that appeared in Mitsubishi Jisho Design explored the possibilities of a portable wooden frame. With relocation in mind, the joints were designed with ingenuity, resulting in a CLT forest-like building.

CLT PARK HARUMI

Using CLT panels for beams - Pavilion building

CLT (Cross Laminated Timber) is a laminated timber material made by laminating lumber with the direction of the fibers changed by 90 degrees each time. It is often used as a panel material for wall structures, but in this pavilion building, it was used as a beam. It looks like a forest with countless CLT panels attached to thin 200mm steel columns, but the overall structure is solved as a large gate-shaped frame. The 210mm thick parallelogram panels become thin beams connecting steel frames, and are connected in the x-axis and y-axis directions to form a frame (frame structure) as a whole. If you look at some of the columns, you will see that the panels are installed offset from one another, so they are coiled up towards the sky.

This project opened up the possibilities of CLT as beams, but also pursued another function: as a movable building. Each panel is connected to the steel frame with bolts, which makes it possible to disassemble and assemble the structure. Thin metal bases are inserted into the small edges of the panels and fixed with drift pins. These metal bases are then joined to the steel frame columns with high-strength bolts to complete the assembly.

Relocation of CLT wall structure – Indoor exhibition hall

The indoor exhibition hall was planned as a set with the pavilion building. We aimed for a floor plan that would allow the pavilion building to be seen at various points while touring the exhibits. This resulted in the triangular plan. The triangle is opened where it faces the pavilion to open up the line of sight. In places where it is necessary to block out light, such as projection exhibits, the triangle is closed. This is why we used CLT for the walls and floors of the indoor exhibition hall.

Although there are many precedents for CLT wall construction, there are not many examples of diagonal walls being used. We combined only CLT panels to create a diagonal wall structure, and created a frame that could be disassembled and reassembled. The detail required for this was the metal fittings to be attached to the CLT. We searched for metal fittings whose strength was regulated in accordance with the legal standards for CLT wall panel construction, and ultimately came up with a combination of metal fittings that would allow the wall panels to be removed simply by fastening and unfastening screws. Additionally, the floor panels are supported in part by beams made of laminated timber. At the joints between the beams and the panels, we designed metal fittings that resemble a saddle on a horse's back. The beams can be removed from the panels simply by loosening the bolts.

Looking up at the indoor exhibition hall
CLT wall – CLT floor joint
Beam-CLT joint

Project Structure

Operator | Mitsubishi Estate Estate Co., Ltd.
Designer | Mitsubishi Jisho Design Inc.
Design Supervisor | Kengo Kuma & Associates
Contractor | Mitsubishi Estate Home Co., Ltd.

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Update : 2020.02.17

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