A lifting device for lifting an upper portion of a building which comprises a roof and a method of constructing a building using such a lifting device. The lifting device includes a base plate arranged to be mounted to an edge region of a support and a lifting platform attached to an actuator and ca
A lifting device for lifting an upper portion of a building which comprises a roof and a method of constructing a building using such a lifting device. The lifting device includes a base plate arranged to be mounted to an edge region of a support and a lifting platform attached to an actuator and capable of vertical movement by means of the actuator. The base plate has a first portion arranged to abut a substantially horizontal face of the support and a second portion arranged to abut a substantially vertical face of the support. The actuator is adjustably mounted to the base plate such that the position of the actuator is horizontally and/or vertically adjustable relative to the base plate to ensure a plumb lift.
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1. A lifting device for lifting an upper portion of a building comprising a roof and an underside, the building further comprising a support having an edge region comprising a substantially horizontal upper face and a substantially vertical side face, the lifting device comprising: a base plate conf
1. A lifting device for lifting an upper portion of a building comprising a roof and an underside, the building further comprising a support having an edge region comprising a substantially horizontal upper face and a substantially vertical side face, the lifting device comprising: a base plate configured to be mounted to the edge region of the support, the base plate having a generally Z-shaped cross-sectional configuration comprising an upper horizontal portion configured to abut the substantially horizontal upper face of the support, a vertical middle portion configured to abut the substantially vertical side face of the support, and a lower horizontal portion configured to support an actuator;a lifting platform configured to abut and lift the upper portion of the building such that a lower portion of the building may be constructed or inserted within a space between the support and the underside of the upper portion of the building; andan actuator movably coupled along a length of the actuator to the lifting platform and configured to vertically move the lifting platform, the actuator fixed to a vertically adjustable plate which is adjustably mounted to the lower horizontal portion of the base plate such that the actuator is configured to be adjusted vertically relative to the base plate to ensure a plumb lift, the actuator further configured to be adjusted horizontally relative to the base plate. 2. The lifting device according to claim 1, wherein the upper horizontal portion has a downwardly extending lip. 3. The lifting device according to claim 1, wherein the base plate has a generally T-shaped cross-sectional configuration comprising two horizontal portions and an intersecting vertical portion. 4. The lifting device according to claim 1, wherein the actuator is slidably mounted to the base plate by virtue of a linear-motion slide assembly comprising a pair of spaced apart runners connected to either the base plate or to a vertically adjustable plate attached to the base plate. 5. The lifting device according to claim 1, wherein the lifting device includes a support means for supporting an upper portion of a building in an elevated position, the support means being arranged in such a manner that the upper portion cannot fall to a floor surface in the event of the failure of the lifting device. 6. The lifting device according to claim 5, wherein the support means comprises a load receiving platform capable of vertical movement, an extendable prop comprising two or more elongate elements capable of telescoping relative to each other, and one or more locking mechanisms to prevent retraction of an elongate element. 7. The lifting device according to claim 6, wherein the extendable prop is adjustably mounted to the base plate such that the position of the prop is horizontally and/or vertically adjustable relative to the base plate. 8. The lifting device according to claim 1, wherein the actuator is a hydraulic actuator. 9. The lifting device according to claim 8, wherein the actuator is a hydraulic jack or hydraulic ram. 10. A method of constructing a building comprising the steps of preparing a floor surface, constructing an upper portion of a building which comprises a roof, lifting the upper portion of the building to an elevated position above the floor surface using one or more lifting devices according to claim 1 so as to create a space between the floor surface and the underside of the upper portion of the building, and supporting the upper portion of the building in the elevated position for further construction work. 11. The method according to claim 10, wherein the upper portion of the building is constructed on a plurality of spaced apart spacer elements on the floor surface and lifted from an initial position on the spacer elements to the elevated position. 12. The method according to claim 10, including the steps of fixing a bottom plate around the perimeter of the floor surface and fixing a top plate around the underside of the upper portion of the building. 13. The method according to claim 10, wherein the one or more lifting devices are mounted to the floor surface. 14. The method according to claim 10, wherein there is a plurality of the lifting devices, each lifting device being spaced apart around an edge along the perimeter of the floor surface and mounted to the edge by the base plate. 15. The method according to claim 10, wherein the upper portion of the building is supported during the lift, and in the elevated position, by one or more support means in such a manner that the upper portion cannot fall to the floor surface in the event of the failure or removal of the one or more lifting devices. 16. The method according to claim 10, wherein the one or more lifting devices each have a safety mechanism to prevent the upper portion of the building from falling to the floor surface. 17. The method according to claim 10, wherein the upper portion of the building is lifted to a first elevated position by the one or more lifting devices and supported in the first elevated position by one or more support means, the one or more lifting devices is then fitted with an extension portion configured to lift the upper portion of the building to a second elevated position which is higher than the first elevated position. 18. The method according to claim 17, wherein the one or more lifting devices lifts the upper portion of the building from the first elevated position to the second elevated position. 19. The method according to claim 10, wherein the upper portion of the building consists of a roof. 20. The method according to claim 10, wherein the upper portion of the building consists of a roof and one or more stories of the building. 21. The method according to claim 10, wherein the further construction work comprises constructing or inserting a lower portion of the building within the space between the floor surface and the underside of the upper portion of the building. 22. The method according to claim 21, wherein the lower portion of the building comprises one or more stories of the building.
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