Box section beam or service duct - is fabricated e.g. in concrete omitting parts not requiring shuttering for fitting later e.g. on site

摘要

The box-section beam, e.g. for use as a structural load bearing member or a service duct, consists of concrete, plastics-based concrete or plastics which may be reinforced. This is pre-fabricated so that all parts not requiring shuttering (hatched portions) are omitted and can be fitted afterwards, e.g. on the building site. FL(1/3)