| 摘要 |
1494362 Concrete deck structure C A BENTLEY and E BENTLEY 28 Feb 1975 [14 Jan 1975] 8383/75 Heading E1W [Also in Division B8] Concrete deck slabs 18 include connectors 10 spaced apart along their edges and comprising a plate 14 at the base of the slab and an upstanding bushing 12 embedded in the slab with a removable lifting bolt 16 which is laterally expandable, Fig. 3, to enable the slabs to be lifted onto beams 20. After removal of the lifting bolt 16 the slab 18 is bolted to the beam 20. The plate 14 may have an upstanding flange 24 or a downwardly extending flange, Fig. 4 (not shown), which may be welded to the beam 20. The bushing 12 is anchored in the slab 18 by a U-shaped reinforcement 22, and has an internally tapered portion to facilitate lifting by the lifting bolt 16. The lifting bolt 16 comprises a shaft 60 having cut-out bevels 66 on which slide dogs 74 of corresponding shape to the cut-outs 66 and which are mounted on rods 70 attached to a washer 76 which may be moved downwardly by turning a threaded eye 64 thus laterally expanding the lower end of the lifting bolt 16. |
