Deflection detector for fresh concrete - has alarm stopping shutter striking at max. permissible concrete deflection

摘要

Shutter striking occurs before the material is completely hard and a detector (12) is placed near or facing a construction zone where deflection (R) may occur e.g. the ceiling (8). The deflection is continuously measured as the shutters (1,2,3) are removed using several hydraulic jacks (10). The deflection is compared to a predetermined max. permissible value and the rate of shutter striking is regulated, so that this value is not attained. If it is, an alarm (16) sounds and shutter striking is stopped. The detector is held on an unbending bar (18), each end of which (19,20) rests on non deflecting material.