Such agreement should include the number of positions where the straight edge will be placed to check conformity. This document details requirement in term of the maximum permissible number of irregularities beneath a Rolling Straight edge. This method was rejected in favour of a 2m straight edge set on the slab and is the methodis adoptedin the currentBS 8204,BS EN 13670 Execution of concrete structures, the National Structural Concrete Specification and National Building Specification. The Metric Calibrated Measurment Wedge is then used to take the measurment, please purchase this tool seperately available on this page above. The idea was to assess unevenness below the temporary datum of the straight edge as a +/- measurement.

Surface regularity - straightedge Standards Surface regularity - straightedge Standards

The wedge blocks which are fitted to either end of the product supports the item as well as providing a set height between the surface and the beam. It should be noted that both of the British standards state that ‘Where the straight edge basis for specification is used it is advisable for the various interested parties in a contract to agree the sampling rate for testing the floor to check conformity, and the procedures to adopt if conformity is not achieved, before the floor is constructed. We can also carry out Straight edge tests using a 3m straight edge, on feet, for checking plus or minus deviations from a given number over a 3m length. Yes – you can’t always tell a product quality from a photo but all our tools are designed for construction work and hence why trades people come back again and again. The Rolling Straight edge is pushed at 1-2km/h and the number of irregularities, their length and distance from start, are recorded.This introduceda 3m straightedge in direct contact with the slab and surface regularity classes SR1, 2, 3, with corresponding permitted deviations below the straight edge of 3, 5 and 10mm. TRL - Supplementary Report 290 - details the calibration, maintenance and use of the Rolling Straight edge. When used with the metric graduated wedge you can measure any vertical irregularity within a range of 12. It is easy to check for irregularities with this item, as it provides the operator with a visual indicator of the evenness of any slab. Also available in lengths of 300 mm, 500 mm, 600 mm, 800 mm, 1000 mm, 1250 mm, 1500 mm, 1850 mmand 2000 mm.

Tradewise SE4 Aluminium Straight Edge 75mm x 38mm Tradewise SE4 Aluminium Straight Edge 75mm x 38mm

The national specifications for surface regularity are then compared and the pavement accepted or rejected and or remedial work undertaken. UK Mainland excludes Northern Ireland, Scottish Highlands, Offshore Islands and the Channel Islands. The Rolling Straight edge simulates a 3m rigid straight edge sliding along the road surface, and consists of a rigid frame supported on rubber-tyred wheels arranged in two parallel rows, with the centres of the wheels in one row opposite the gaps between the two parallel rows of supporting wheels, is free to move such that it detects vertical movements of this wheel which are then transmitted to a pointer and scale, on the instrument head. The straight edge also has an odometer for accurate determination of distance travelled in units of 1 metre.This consistedof a collapsible 3m long frame with a wire stretched to standard tension from which to measure the deviation was proposed. Methods of assessment of levels and surface regularity states “Where the straight edge basis for specification is used it is advisable for the various interested parties in a contract to agree a sampling rate for testing the concrete base … before the concrete base …is constructed.

Surface Regularity / Straight Edge Tests - Face Consultants Surface Regularity / Straight Edge Tests - Face Consultants

Ensuring a surface is even and smooth once concrete finishing is completed is a vital task for construction professionals eager to leave an accurate and neat job.SpecificationThe rolling straight edge is shipped in 3 wooden cases with a total gross weight of 112kg. The Rolling Straight edge measures depressions on the pavement surface on analogue scale 0-12mm + 0. Such agreement should include the number of positions where the straight edge will be placed to check conformity’. The 3m straightedge was superseded by a new 2m straight edge and is the method is adopted in the current BS 8204, BS EN 13670 execution of concrete structures, the National Structural Concrete Specification and National Building Specification. Straight edge tests can be carried out to check for compliance with British Standards BS 8204 Part 2 : 2003 to see if the SR1, SR2, or SR3 classifications are being achieved.