Research on Construction Technology and Mechanical Properties of a Separated Construction Elevator Foundation

Hollow core floor slabs are widely used in shopping malls, office buildings and other large places because of their light weight, high degree of assembly, easy construction and sound and heat insulation. However, due to the existence of its internal apertures, the bearing capacity of the hollow core floor slab is obviously insufficient compared with that of the solid floor slab, resulting in that when the house is strengthened and remodeled, the bearing capacity of the hollow core floor slab is unable to satisfy the requirement of being used as the foundation of large-scale machineries, such as the construction elevator. For this reason, a temporary equipment foundation for hollow floor slabs, i.e., a separated construction elevator foundation, is proposed, which avoids the hollow floor slabs from bearing the load directly by transferring the loads of large-scale construction equipment directly to the frame beams from this foundation. Combined with the renovation project of the east tower of Guangzhou International Media Port, the structural form, construction process and implementation effect of the new foundation are analyzed and discussed, and the results show that the separated construction hoist foundation proposed in this paper has a simple structure and clear force transmission, which can effectively solve the problem of insufficient bearing capacity of hollow core floor slabs. The new lift foundation yield load, peak load and its corresponding displacement are 5257 kN, 7765 kN and 0.7 mm, 5.7 mm, which are much higher than the lift load of 460 kN, and at the same time, the foundation has a larger bearing capacity stiffness, which ensures that the foundation plate only undergoes a small deformation during the work of the lift and avoids the hollow floor slab from bearing the load.