Before tree trunks become columns

Tree trunks from Staatsbosbeheer (Dutch Forest and Nature Reserve) are being inspected. A pictorial report.


8 numbered tree trunks to be assessed


Taking first tree trunk to assessment place


Manual resistance measurement with knife


Tree trunk overview


Head side of rejected tree trunk with fruiting body of brown-rot fungi


Peeled side of rejected tree trunk with fruiting bodies of brown-rot fungi


Mechanical resistance measurement with resistograph


Graphical result of resistograph


Measuring cracking pattern of brown rot


Analysis of the penetration depth and spreading of the rot


Healthy tree trunks


Decay caused by fungi permeating the fibrous structure of the wood


Curve measurement by yellow twine



Selected trees are nearly straight


Turning of new tree trunks for peeling


Fresh douglas wood to replace the two rejected tree trunks


End of the tree trunk with tree code of Dutch Forest and Nature reserve



Finishing of first assessment


From 15-17 meter trees only 9 meter is needed for the columns...


...and the rest is being sawn into bars by Rusman...


...to be used as deck edge of the GTB Lab.


Inspection of leftover wood pieces turned into timber for deck edge of GTB Lab


Closer inspection



28 pieces of 310 x 30 x 10 cm douglas