Nikken Sekkei Ltd.

Mokuzaikaikan

Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda

MOKUZAIKAIKAN

Nikken Sekkei

LOCATION
Koto, Japan

AREA
1011.0 m²

ARCHITECTS
Nikken Sekkei

PHOTOGRAPHS
Nacasa & Partners Inc, Harunori Noda

MECHANICAL & ELECTRICAL ENGINEER
NIKKEN SEKKEI, Koji Sugihara, Koichiro Hara

QUANTITY SURVEYOR
Nikken Sekkei

MAIN CONTRACTOR
Taisei Corporation

CIVIL ENGINEER
NIKKEN SEKKEI, Toshihiko Kouno, Takeshi Asakawa, Seiya kimura

INTERIOR WORKS
NIKKEN SEKKEI, Tomohiko Yamanashi, Takeyuki Katsuya

STRUCTURAL ENGINEER
NIKKEN SEKKEI, Toshihiko Kouno, Takeshi Asakawa, Seiya kimura

LIGHTING DESIGN
Hideto Mori(LightingM)

YEAR
2009

MAIN CONTRACTOR
Taisei Corporation

Text description provided by architect.

This project involved the relocation of the offices of the Association of Wood Wholesalers in Tokyo. It serves as a showcase to demonstrate the possibilities of wood as an urban construction material.

Engawa, or Japanese terraces, allow a natural breeze to enter while shutting out strong sunlight for a comfortable indoor environment. Lumber were integrated into the building's structure, and architectural exposed concrete was cast in cedar formwork.

Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda

Since the building uses a large amount of wood, great attention was given to fire safety measures. The design focused on creating spatial continuity with the use of layering and natural light.

SPACE CONFIGURATION

A semi-outdoor space called engawa, existing in traditional Japanese homes, allows a natural breeze to enter the shelter while shutting out strong sunlight, achieving a comfortable indoor environment in the midst of harsh heat and humidity.

From the traditional engawa, a new space configuration was realized. In this configuration, elements of an office, such as its structure, circulation system, and facilities, are reconstructed in a semi-outdoor environment.

Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda

This configuration strives to connect the outdoors with the universal office, while simultaneously acting as a buffer against the harsh side of the external environment. Sets of terraces come together to make a porous skin.

Deep eaves shut out direct sunlight and rain as well as offer a comfortable outdoor area where one can experience natural light, breezes, and other aspects of nature, as if living in the middle of the woods.

WOOD CULTURE

There has been an architectural culture since ancient Japan, where the structure is made up of lines of beams and columns. This building aims to revive such a culture in an urbanized area in a newly developed form. In order to feel the presence and texture of wood using all five senses, 105mm x 105mm blocks of wood, a standard size distributed by the timber markets of Japan, were stacked or integrated into all parts of the building.

Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda

In order for the SRC (Steel Reinforced Concrete), the structural support of this architecture, to merge with the scale of wood, the width of the plate-like pillars were kept to a minimum and the concrete was given a wooden texture by casting it in cedar frames.

TECHNICAL METHOD

This building utilized Numerical Control Machining (otherwise known as NC), an innovative wood cutting machine. Processing wood often relies a great deal on craftsmanship. However, the NC method achieves high accuracy and productivity and is able to create highly abstract designs.

Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda

The hall on the top floor was assembled from 115mm beams of wood that were processed by NC to form a structural body that spans about 25m. A traditional Japanese technique was modified to adjoin the wooden beams along their lengths to establish one combined panel. Oak wooden plugs were inserted in between the cypress and were unified by bolts, creating a new smooth surface to wood, which is only possible with the high accuracy of the NC method.

FIRE PREVENTION

One complication faced when using wood in architecture is fire safety. This building overrides this issue by providing adequate ceiling height to accumulate fire smoke and made use of wood in many parts of the building possible.

Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda

PASS THROUGH AND OVERLAP

There is an aspect of Japanese spatial composition that makes use of layering and preserves spatial continuity. Instead of building a wall to divide spaces, fixtures are installed to give an abstracted impression of the adjacent space.

In this way, spaces flow from one into other. This building achieves this spatial richness. Rooms, walls, and the roof are dispersedly located, giving movement and flow to the scene, while a sense of the next space is subtly delivered, via the sights that pass through or the light that enters into an area.

Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda


Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda
Mokuzaikaikan
© Nacasa & Partners Inc, Harunori Noda


Mokuzaikaikan
Wood Beam Plot
Mokuzaikaikan
Section


Mokuzaikaikan
Section
Mokuzaikaikan
Section


Mokuzaikaikan
Section
Mokuzaikaikan
Floor plan
Mokuzaikaikan
Floor plan
Mokuzaikaikan




Floor plan
Mokuzaikaikan
Floor Plan
Mokuzaikaikan
Celling Plan


Mokuzaikaikan
Site Plan
Mokuzaikaikan
Assembling  Wood Blocks

Nikken Sekkei Ltd.
T +81 3 52263030 F +81 3 52263052
Nikken Sekkei Ltd.
2-18-3 Iidabashi, Chiyoda-Ku, Tokyo, Japan