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钢桁架结构具有承载力高、造型美观多样等特点,在体育馆等大跨度建筑中应用广泛.对于大跨双向钢桁架结构的施工,越来越多地采用高空滑移施工方案.在现有钢桁架多滑道滑移施工方案基础上,针对大跨双向钢桁架结构提出了一种新的滑移技术——变拱滑移施工技术,以实现降低滑移施工造价的目的.根据结构变拱机理的不同分为升拱式滑移技术和降拱式滑移技术,前者通过预先垫高钢桁架的端部并进行结构拼装焊接之后,撤掉垫板以增大跨中临时支撑受力而减小端滑道的竖向反力;后者通过预先垫高钢桁架跨中部位并进行结构拼装焊接之后,撤掉跨中垫板以增大两端滑道受力而减小中间滑道临时支撑的竖向反力.基于变拱式滑移施工技术概念,以沈阳奥体中心体育馆为例,分析不同变拱方式下的关键杆件应力、多滑道支撑支座反力变化等,探讨大跨双向钢桁架结构采用变拱滑移施工技术的可行性,为今后类似工程确定滑移施工方案提供参考.
Steel truss structure has the characteristics of high bearing capacity and beautiful appearance, it is widely used in large-span structures such as gymnasium, etc. For the construction of large-span bidirectional steel truss structure, more and more high-altitude sliding construction schemes are adopted.At the existing steel Truss multi-slide slip construction scheme, a new slip technology-variable arch slip construction technology is proposed for the large-span bidirectional steel truss structure to achieve the purpose of reducing the cost of slip construction.According to the structural arch The mechanism is divided into lifting arch slip technology and falling arch slip technology, the former by pre-padded steel truss ends and structural welding, remove the pad to increase the temporary support force in the span Reduce the vertical reaction of the end slide; the latter by pre-high steel truss across the mid-site and the structural assembly welding, remove the mid-span plate to increase both ends of the chute to reduce the middle chute Based on the concept of variable-arch slip construction technology, take the Shenyang Olympic Sports Center Gymnasium as an example to analyze the stress of key bars under different arch-ways and the reaction force of multi-slide support bearings, Discussion on Long - span Bidirectional Steel Truss Configuration becomes the feasibility of construction techniques slip arch, to provide reference for determining the sliding construction scheme similar projects.