detail_2006_1+2.pdf

2006 ´ 2 ¶

Mini-house in Kobe

Architect:

Hiroaki Ohtani, Kobe

Structural engineer:

Hirokazu Touki, Kobe

This tiny (just 33 m 2 ) plot offered a chance

for a young couple to build a house in ex-

pensive downtown Kobe. But it meant a rad-

ical change of lifestyle. Storage space and

separate, closed-off rooms had to be sacri-

ficed. Behind the largely glazed front, some

privacy is gained through offsetting the lev-

els inside. Slats built into the facade and a

large tree outside also screen the interior.

The space is maximised by using few mate-

rials and concealing details. The double-

flight staircase, at first sight seemingly over-

sized, actually fulfils the same purpose, link-

ing all levels into a single space continuum,

and enabling diverse visual connections be-

tween the various areas. The wooden steps,

also used as seats, take up the theme of the

dominant concrete slats.

Throughout the house over 1800 of these

precast units were threaded onto vertical

steel rods; where they form a continuous

unit, they act as structural columns or wall

slabs. In the non-supporting sections, the

slats are evenly spaced. Steps, seats and

counter tops are inserted into these gaps;

switches and supply lines are also con-

cealed here.

Floor plans

Sections

scale 1:200

1 Entrance

2 Storage

3 Bedroom

4 Front garden

5 Bathroom

(later childrenÕs

room)

7 Roof terrace

8 Kitchen

9 Dining

area

¶ 2006 ´ 2

Mini-house in Kobe

Sections

scale 1:20

sot(cs

tensioning at street front)

2 50/180 mm precast concrete

os1fhttu

up to 3600 mm in length;

slats over 1000 mm long are tensioned

along their length with two steel cables

(circular stainless-steel caps visible on

the ends)

3 skylight, 10 mm transparent polycarbonate

4 transparent glass strips, 15 + 15 + 19 mm

5 sliding panel, toughened glass in

aluminium frame

6 sisal carpet, 100 mm reinforced concrete

50/180 mm precast concrete

7 translucent glass strips, 15 + 15 + 19 mm

ptfcsm2¯

concrete slats in the solid,

supporting wall sections; after threading,

cables tensioned per floor

(basement: 300 kN; ground floor: 250 kN;

1st floor: 150 kN), then intermediate areas

between cables and slats filled in with

jointing mortar

essgps

rigid PU foam core, on steel spacers

10 6/50 mm stainless-steel bar

pbbswm5

concrete slats

Mini-house in Kobe

2006 ´ 2 ¶

Photo: Kouji Okamoto/Techni Staff, Fukuoka

2006 ´ 2 ¶

House in Chur

Architect and Structural engineer:

Patrick Gartmann, Chur

Site plan

scale 1:1500

High above the upper Rhine valley, on the

slopes of Hochwang mountain, is this three-

storey detached house. Situated within an

area subject to a rigorous development plan

(drawn up by Bearth and Deplazes), this

cuboid volume unfolds inside in a virtuoso

sequence of spaces Ð from the living room

at the top with a picture-book view of Chur

and the mountains beyond to the large

kitchen/dining room on the ground floor,

which has direct access to the garden. Only

a few materials were used in its construc-

tion, most of them left untreated, for example

exposed concrete and solid walnut and

larchwood. The special feature of this

house, however, is its monolithic construc-

tion. Its sculpted outer form is produced not

by intricate multiple layering, but through the

use of a single, solid material Ð concrete.

Depending on structural requirements or re-

quired insulation values, the walls are made

of either ordinary concrete or insulation-

grade structural concrete. The outer walls

are 45 cm thick (U-value: 0.58 W/m 2 K ap-

prox.) and the roof slab 60 Ð 65 cm (U-value:

0.4 W/m 2 K approx.). No further layers were

necessary Ð no insulation, no plaster, no

render, not even any metal flashing or gravel

on the roof. The insulating concrete was de-

veloped by the architect himself, in co-oper-

ation with two manufacturing firms. In this

new product, gravel was replaced by ex-

panded clay and sand by expanded glass.

Like the expanded clay, the glass pellets

are insulating and lightweight. Their shape

promotes good flowability and helps control

undesirable reactions between the glass

and the cement that could lead to spalling

and rust. No surface treatment was applied,

except for on the roof, where a UV-resistant,

permanently elastic coat of plastic-modified

cement slurry was applied to prevent mois-

ture penetration. Although this special con-

crete was almost twice as expensive as

conventional concrete, savings were made

in terms of fewer trades on site, a shorter

build time and because the outer skin is only

a single-layer construction.

Sections ¥ Floor plans

scale 1:400

¶ 2006 ´ 2

House in Chur

Photo: Thomas Dix/architekturphoto, Dsseldorf

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