The Phase III expansion project of Lanzhou Zhongchuan International Airport is positioned as a “Western Model Airport” created by the Civil Aviation Administration of China and an important hub project of Gansu Province’s “two vertical, two horizontal and one hub”. It is not only a major project of Gansu Province’s “13th Five-Year Plan”, but also the largest construction project in the history of Gansu Civil Aviation. It has been included in the National “Three-Year Action Plan for Major Transportation Infrastructure Projects”.

As one of the important highlights of the architectural modeling and effect design of this project, the GTC roof adopts the form of “outer circle elliptical steel structure metal roof + atrium pipa-shaped aluminum alloy structure skylight dome”. In order to maintain the consistency of the roof building appearance, the outer circle steel structure grid shell roof and the atrium aluminum alloy structure grid shell roof are designed as an integral force system. The entire ultra-large span steel-aluminum hybrid roof is supported by tree branch columns and surrounding roof supports. The atrium dome aluminum structure is a single-layer grid shell structure. The central area of ​​the building roof looks like an aluminum alloy structure skylight roof with a “rebound pipa”. The overall structural curve is smooth and beautiful. It is the first large-span aluminum alloy single-layer grid shell structure project in Gansu Province.

The main structure of the atrium skylight dome aluminum structure grid shell adopts high-performance aluminum alloy profiles, which are connected to the steel structure ring beam through steel brackets. The main aluminum structure installation node form is an aluminum round cover plate node. The H-section aluminum alloy rod is fixed by two upper and lower aluminum alloy disc node plates with stainless steel ring groove rivets.

The curved curved structure of the pipa-shaped aluminum alloy roof at the atrium of Lanzhou Zhongchuan International Airport is very contemporary, and it not only meets the requirements of safety and applicability, but also takes into account the symbolism and aesthetics. After completion, this project will play an important “engine” role, which is of great strategic significance for accelerating the construction of the Northwest regional aviation hub, promoting the national “Belt and Road” strategy, and promoting the coordinated development of the western region.

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