Permanent formwork for structural fill lining or insulation in mining - consists of flexible water permeable crack resistant plastic fibre fleece one half millimetre thick and with surface weight of one hundred grams per square metre

摘要

The formwork fleece is of polyethylene, polypropylene or polyimide fibres, and contains additives to make it inflammable and a good conductor of electricity. The structural fill is a hydraulic setting material. Alternatively the fleece can be impregnated with a material and covered with a layer of salt paste (3) which sticks well on the porous surface of the fleece. ADVANTAGE - Cheap to produce and rot resistant.