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- Acrow_prop abstract "An Acrow prop is a piece of construction equipment. It is a telescopic tubular steel prop, used as a temporary support. Acrow props are adjustable for height by a large diameter screw thread, formed on the outside of the tube itself. The screw thread provides a fine adjustment over a short range. A loose pin through a series of holes in the inner tube gives a wider range of coarse adjustment. Use of a screw thread also allows the props to be tightened when already in place, to adjust the load that each one bears. Props are made in a range of five BS standard sizes:size 0 from 3.5 feet (1.1 m) to 6 feet (1.8 m),size 1 from 5.75 feet (1.75 m) to 10.25 feet (3.12 m),size 2 from 6.5 feet (2.0 m) to 11 feet (3.4 m),size 3 from 8 feet (2.4 m) to 13 feet (4.0 m),size 4 from 10.5 feet (3.2 m) to 16 feet (4.9 m). The safe load for each prop is a maximum of 35 kilonewtons (7,900 lbf), reducing slightly when props are fully extended, or by up to half when the load is not perfectly vertical.Acrow props are mostly used for shoring: temporary supports during building repair or alteration work, rather than scaffolding: access platforms for workers. A typical use is to support an existing horizontal beam whilst its original masonry supports are removed or repaired. When masonry itself is to be supported, holes are first knocked through the brickwork and a strong 'needle' or 'strongboy' is placed through the hole. A pair of Acrow props are then used, one under each end. Existing windows or doorways may also be supported directly, or via needles.The base and top plate of Acrow props are quite small, so they are suitable for supporting a vertical load but are at risk of toppling if there is any sideways force. In such cases, props should be strutted or 'laced' with scaffolding poles. A recent improvement to Acrow props was to shape this baseplate with notches, allowing pallet loads of horizontal props to be stacked neatly, rather than randomly piled.Although the original Acrow prop was only intended for vertical support, the range has since been extended. Shoring 'push and pull' props with swivelling footplates are available and are used to support concrete formwork. Horizontal strutting props are used for shoring trenchwork. These are similar, but have a 'claw' form to their baseplates.Acrow props, their size, strength and construction, are now described by a British Standard BS4074: 1982. A similar lightweight European prop design exists, these have a maximum capacity of only 5 kilonewtons (1,100 lbf).".
- Acrow_prop thumbnail Acrow_prop.jpg?width=300.
- Acrow_prop wikiPageID "33412199".
- Acrow_prop wikiPageLength "3909".
- Acrow_prop wikiPageOutDegree "11".
- Acrow_prop wikiPageRevisionID "667479585".
- Acrow_prop wikiPageWikiLink Acrow_Group.
- Acrow_prop wikiPageWikiLink Category:Construction_equipment.
- Acrow_prop wikiPageWikiLink Construction.
- Acrow_prop wikiPageWikiLink Formwork.
- Acrow_prop wikiPageWikiLink Kodak.
- Acrow_prop wikiPageWikiLink Pallet.
- Acrow_prop wikiPageWikiLink Scaffolding.
- Acrow_prop wikiPageWikiLink Screw_thread.
- Acrow_prop wikiPageWikiLink Shoring.
- Acrow_prop wikiPageWikiLink Sir_Robert_McAlpine.
- Acrow_prop wikiPageWikiLink File:Acrow_prop.jpg.
- Acrow_prop wikiPageWikiLinkText "Acrow prop".
- Acrow_prop wikiPageUsesTemplate Template:Convert.
- Acrow_prop wikiPageUsesTemplate Template:Refimprove.
- Acrow_prop wikiPageUsesTemplate Template:Reflist.
- Acrow_prop subject Category:Construction_equipment.
- Acrow_prop hypernym Piece.
- Acrow_prop type MusicalWork.
- Acrow_prop type Redirect.
- Acrow_prop comment "An Acrow prop is a piece of construction equipment. It is a telescopic tubular steel prop, used as a temporary support. Acrow props are adjustable for height by a large diameter screw thread, formed on the outside of the tube itself. The screw thread provides a fine adjustment over a short range. A loose pin through a series of holes in the inner tube gives a wider range of coarse adjustment.".
- Acrow_prop label "Acrow prop".
- Acrow_prop sameAs Q4676567.
- Acrow_prop sameAs m.013f7zl_.
- Acrow_prop sameAs Q4676567.
- Acrow_prop wasDerivedFrom Acrow_prop?oldid=667479585.
- Acrow_prop depiction Acrow_prop.jpg.
- Acrow_prop isPrimaryTopicOf Acrow_prop.