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The Tüfisteg pedestrian and bicycle bridge, Adliswil

2020

Line

The Tüfisteg pedestrian and bicycle bridge in Adliswil is getting on in years. Analyses showed that replacing the bridge would cost almost as much as renovating it. Today, a new bridge leads over the Sihl - with beech wood from the surrounding forests.

The new Tüfisteg zoom
The new Tüfisteg
Assembly work on the bridge zoom
Assembly work on the bridge
Detail of the node in the bridge zoom
Detail of the node in the bridge
Cut of the bridge zoom
Cut of the bridge

The Project
Since 1932, the Tüfisteg has formed an important connecting route across the Sihl and is also part of the “Sihluferweg”, which is actively used by the people of Adliswil. The bridge from 1932 was already replaced by a new bridge in 1985. Now, 45 years later, this bridge has also reached its zenith. In a first step, the company Timbatec was commissioned to record the condition of the existing bridge. The analyses showed that the bridge would have to be comprehensively rehabilitated or replaced immediately. The city of Adliswil decided to build a new bridge in the same style. The bridge in Adliswil is the first bridge in Switzerland with a pure beech wood construction.


The Construction
The 45-meter-long truss structure was planned and executed entirely with beech wood from the region. For the highly loaded compression bars, packages of small bar cross-sections were assembled instead of the usual large cross-sections glued together. This allows for better structural and chemical wood protection. Because: The components can dry more easily and be better impregnated.


The Challenges
The planning of an open bridge with beech wood requires precise planning of the construction as well as the construction process from the cutting of the logs to the finished bridge. The close cooperation of the planners with the sawmill, the impregnation plant and the good communication were the key to success.

Construction Data

- Solid beech wood 26 m³

- Steel 10 t


Construction costs

 - BKP 1-9: 650,000 Swiss francs


Prestations de Timbatec

- SIA Phase 11 Status analysis
- SIA Phase 21 Static check
- SIA Phase 31 Preliminary project
- SIA Phase 32 Construction project
- SIA Phase 41 Tender and comparison of offers 
- SIA Phase 51 Implementation project
- SIA Phase 52 Design
- SIA Phase 53 Commissioning
- Statics and construction 
- Cost estimate 
- Specialist construction management and construction site inspections  

Architecture
Timbatec Holzbauingenieure Schweiz AG, 8005 Zürich

Building Owner
Stadt Adliswil, 8134 Adliswil

Timber Construction Engineers
Timbatec Holzbauingenieure Schweiz AG, 8005 Zürich

Timber Construction
Holzbautechnik Burch AG, 6060 Sarnen

Construction Management
Timbatec Holzbauingenieure Schweiz AG, 8005 Zürich

Photography
Nils Sandmeier, 2501 Biel

Impregnating plant

Imprägnierwerk AG, 6130 Willisau


Timber cutting

Konrad Keller AG, 8476 Unterstammheim

  • Tüfisteg, Adliswil

    Pedestrian and bicycle bridge Tüfisteg, Adliswil

    Lignum Holzbulletin 139/2021 Hardwood – The «Tüfisteg» pedestrian and bicycle bridge replaces the previous connection over the Sihl. It was built with beech wood from the surrounding forests. With a specially developed construction and appropriate impregnation, it should be possible to achieve what was previously considered impossible for the exterior from a technical point of view. Time will tell whether the chosen approach proves successful. (Report in German and French)

  • Brücken aus Holz

    Brücken aus Holz

    Timbatec Magazin 1/2021

  • Nun hat Adliswil eine neue Holzbrücke

    Adliswil has a new wooden bridge

    Zürichsee-Zeitung, Issue 5.11.2020 - Major action on the Sihl: The 35 year old Tüfi bridge over the Sihl was partly rotten. This week the old bridge was replaced by a new one - in a spectacular way. (Report in german)

Print reference
 
 
 

Switzerland:

Thun Branch

Timbatec Timber Construction Engineers Switzerland Ltd.

Niesenstrasse 1, 3600 Thun

Tel: +41 58 255 15 10

thun@timbatec.ch


Zürich Branch

Timbatec Timber Construction Engineers Switzerland Ltd.

Ausstellungsstrasse 36, 8005 Zürich

Tel: +41 58 255 15 20

zuerich@timbatec.ch


Delémont Branch

Timbatec Timber Construction Engineers Switzerland Ltd.

Avenue de la Gare 49, 2800 Delémont 

+41 58 255 15 40 

delemont@timbatec.ch


Bern Branch

Timbatec Timber Construction Engineers Switzerland Ltd.

Falkenplatz 1, 3012 Bern

Tel: +41 58 255 15 30

bern@timbatec.ch

Austria:

Headquarters Vienna (A) 

Timbatec Timber Construction Engineers GmbH
Im Werd 6/31a, 1020 Wien 
Tel: +43 720 2733 01

wien@timbatec.at


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