§ 04
Built once.
Repaired forever.
One thing I really cared about: the bridge should be easy to take apart again. Everything is bolted, not glued — so if a panel breaks, you just unscrew it. After many years, the wood can go back to nature and the electronics back to recycling.
Embodied carbon · A1–A3
38 −4.1 tCO₂e
A comparable steel-and-concrete pedestrian bridge of the same span embodies ≈ 38 tCO₂e. The KTB is a net carbon store of roughly 4.1 tCO₂e thanks to biogenic sequestration in 11 m³ of certified glulam.
Material breakdown
Glulam GL28h
11 m³
−8.9 tCO₂e (biogenic)
Concrete (abutments)
6 m³
+1.6 tCO₂e
Steel (connectors)
0.4 t
+0.7 tCO₂e
Aluminium (LED)
0.08 t
+0.5 tCO₂e
LiFePO₄ cells
50 kWh
+2.0 tCO₂e
Lifecycle
A 60-year horizon.
Y 0
Install
Prefab + crane lift, 1 day on site.
Y 1–10
Run
Annual visual + bolt-torque audit.
Y 12
Refresh
Replace kinetic panels (cell ageing).
Y 25
Refit
Replace LiFePO₄ stacks; recycle ≥ 95%.
Y 60
Return
Disassemble, reuse beams, regrind concrete.
SIA 260/261
Structural standard
EN 1995-2
Timber bridges
IP65
Battery enclosure
R12 / DIN 51130
Slip resistance
EN 13201
Lighting class P4
PEFC / FSC
Timber chain of custody
UN 38.3
Battery transport
Minergie-A
Operational target