Complete cavity filling in prestressed concrete structure - involves introduction of measured volume of gas and removal before measured filler insertion

摘要

The process is used in bridge construction and elsewhere, for completely filling a hollow space. It is esp. applicable to a partially filled sheathing tube for a stress member in a prestressed concrete structure, with preliminary evacuation. Air is sucked out of the cavity (8) until a predetermined level is attained. Gas is introduced, with and the volume is metered. The volume of the cavity is determined from the amount of gas flowing in. The gas is sucked out down to the level of a slight residual pressure. The filling substance (6) is introduced, and its volume is metered. This makes it possible to ensure that a cavity is completely filled with filler, without drilling into the structure.