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分离式施工升降机基础施工工艺及力学性能研究

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

  • 摘要: 空心楼板因其自重轻、装配化程度高、施工方便、隔声隔热等特点,被广泛应用于商场、办公楼等大型场所中。然而,由于其内部孔道的存在,使得空心楼板的承载能力与实心楼板相比明显不足,造成对房屋加固改造时,空心楼板的承载力无法满足作为施工升降机等大型机具基础的要求。为此,提出一种用于提升空心楼板承载力的新技术,即一种分离式施工升降机基础,通过将大型施工机具荷载由该基础直接传递到框架梁上,避免空心楼板直接承受荷载。结合广州国际媒体港东塔楼改造项目,对新型基础的构造形式、施工工艺流程和实施效果进行分析讨论。结果表明,本文提出的分离式施工升降机基础构造简单、传力明确,能够有效解决空心楼板承载力不足的问题。新型升降机基础屈服荷载、峰值荷载及其对应的位移分别为5257 kN、7765 kN和0.7 mm、5.7 mm,远高于升降机荷载460 kN,同时基础承载力刚度较大,可保证升降机工作时基础板仅发生微小变形,避免空心楼板承受荷载。

     

    Abstract: 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.

     

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