The 4 m straightedge – evenness measurement according to TP Eben
The 4 m reference staff according to TP-Eben 2017 or RVS 11.06.62 is used to measure the longitudinal evenness of road surfaces in road and path construction. It is the reference method for the planographer.
The distance between the measuring edge and the road surface is measured using a metal measuring wedge, which is pushed under the alignment rod. The distance can be read off precisely using markings on the measuring wedge. For better orientation in the longitudinal direction, the straightedge has markings at 10 cm intervals. In the longitudinal direction, the straightedge is placed on the surface offset by 2 meters so that a measured value is recorded for every 2 meter section.
Our 4 m straightedge can be split into two parts. This is not only particularly practical for transportation, but also for determining the transverse evenness, as a 2 m straightedge is also sufficient for this (e.g. for measuring rut depths or fictitious water depths). This means that the dismantled 4 m straightedge can also be used for these measurements. The straightedge meets all the requirements of TP Eben 2017 and has a minimum deflection of less than 0.5 mm over 4 meters. The 2nd generation now weighs just ~6.5 kg (compared to 10 kg for its predecessor). This makes it particularly light and easy to handle. Two stands supplied, which can be attached to the ends of the straightedge, prevent the straightedge from tipping over. For safe storage and easy transportation, we supply the straightedge in a lightweight bag made of truck tarpaulin and a wood inlay. The straightedge is also available complete with a solid stainless steel measuring wedge. The straightedge is of course supplied calibrated.