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Comparison of the anti-fungal efficacy of Cobra with drill perforation on oscillating pressure treated spruce transmission poles -Laboratory test
1988 - IRG/WP 3469
A laboratory method for measuring the depth of penetration of the fungicidal concentrations effective against basidiomycetes (brown rot) was developed. The tests on CCB oscillating pressure treated spruce transmission poles have shown that the depth of salt penetration can be increased by about 10 mm by a drill perforation before the impregnation. An even better penetration is reached, however, if an additional COBRA process with "Wolmanit-B-Mischung" is applied after the oscillating pressure treatment. In this way the entire cross section of spruce transmission poles is protected except for a core diameter of 30 mm.
E Graf, B Zgraggen

A novel device for detecting internal defects in wooden poles
1989 - IRG/WP 2329
The diagnosis of internal defects caused by termites and decay in hardwood transmission poles has been investigated using a novel Automatic Feed Drill (AFD) pole testing device. Internal defects were recognised by changes in drill feed-rate as the automatic air-driven drill traversed its 100 mm working stroke. The instrument is portable, simple to operate and recognises defects instantaneously. Tests carried out on pole material in the laboratory and the field showed that the instrument gives quick and accurate measurements of internal collapse and weakness in wood at the groundline zone.
R A Eaton, R S Johnstone

A review of incising as a means of improving treatment of sawnwood
1994 - IRG/WP 94-40019
The use of incising, perforation of the wood surface, is increased because of the need to treat refractory wood species. This paper reviews the development of incising and shows how the required incising patterns can be determined and specified. Most of the development has been in the area of toothed-roller incisors because of their rapid throughput. Needle, Laser, drill and water jet incisors have also been used experimentally but such incisors are not available commercially to our knowlege. The advent of close-spaced roller incising patterns and thin, sharp teeth has brought the effective treatment of most refractory species within our grasp. Modern toothed-roller incisors can provide an integral shell of preservative treatment while leaving an acceptable surface appearance and strength. Incising appears to improve the drying rate of green lumber and reduce the incidence of large checks. Three long-term field tests provide confidence in the long-term performance of CCA-treated incised lumber made from refractory species with non-durable heartwood.
P I Morris, J J Morrell, J N R Ruddick

Field Tests on Poles. A report from practice
2006 - IRG/WP 06-20343
A routine field inspection of some 1000 creosote poles during summer 2005 in northern Jutland, Denmark. The routine inspection was done by hammering, Pilodyn testing and taking core samples with a Matson Borer. Additionally a drill resistance measurement was done with a device consisting of the drill machine with a long, flexible steel needle with 1,5mm diameter and the measuring computer/battery-block (“Resistograph”). The needle is drilled with constant speed into the wood and the power uptake of the drill is measured. It showed excellent features for the investigation of poles or other wooden elements in service. But it is time consuming and heavy, thus, the old hammer method revealed to be still the fastest possibility to find out questionable poles. Thus, as an additional tool the Resistograph can be used at least on poles that were found to be in questionable condition and also on poles of particular importance, for example near roads or other places where a failure could lead to severe damages.
A Peylo, C-G Bechgaard