【摘要】：高空連廊結構是近二十年來逐漸發(fā)展起來的一種新型結構型式,由于其外觀上的獨特性及功能上的多樣性,越來越多的設計師青睞于這種懸空結構。本文以揚州智慧大廈高空多層混凝土連廊的施工為研究背景,在對比分析了幾種施工支模方法的基礎上,結合本工程的具體特點,確定了將空間鋼桁架承力結構作為連廊施工的支模平臺,并針對下列幾個施工難點問題展開了研究：(1)支模鋼平臺及鋼牛腿的設計選型問題。通過分析對比兩種支承方式的空間鋼桁架結構—上承式和斜撐式,確定了以上承式空間鋼桁架結構作為支模鋼平臺的結構型式,并分析了該結構的自振特性�？紤]到鋼平臺使用階段的支座反力較大,所以支承牛腿的設計采用了抗剪能力較強的雙腹板箱型牛腿。此外,還研究了鋼平臺在使用階段對已建主體結構的影響,并對拉應力較大位置采取了加強措施。(2)支模鋼平臺的拆除期問題。本文按照一定的分析思路,先對第1道連廊梁板單獨承受第2道施工時的腳手架布置進行設計,確定出基本荷載信息,然后利用ANSYS分析了半剛性連接的鋼管腳手架整體結構在不同荷載工況下的受力行為,通過將腳手架的支反力導入到第1道連廊梁板與主體結構的整體模型中,驗算了第1道連廊梁板在10d齡期下單獨承受第2道施工時的受力性能,結果顯示,各桿件的變形均滿足要求,但是次梁的承載力不滿足要求,需對次梁采取加強措施。加強次梁后,理論上施工完第1道連廊梁板即可拆除鋼平臺,但實際施工過程中,為了保證工程質量和安全,待澆完第2道梁板混凝土后再拆除鋼平臺。(3)支模鋼平臺的安裝問題。作為本工程高空混凝土連廊施工的支模鋼平臺為空間鋼桁架結構,其常見的安裝方案有多種,根據施工現場的實際情況,初選了支模鋼平臺的兩種安裝方案,通過對兩種方案進行多指標綜合比較,最終確定了采用優(yōu)勢最為明顯的整體提升法來安裝和拆除支模鋼平臺。此外,文章分析并解決了本工程提升過程的一些技術難點問題,同時給出了整體提升安裝的具體思路。(4)支模鋼平臺施工過程中的控制問題。首先,基于對計算結果的評價指標,從3種吊點布置方案中確定了最為合理的8吊點方案。在已知吊點布置的位置及數量后,分兩種情況研究了提升位移差限值的控制問題,經過比較,確定了將各吊點的位移差限值設為±30mm。隨后,針對鋼平臺在提升階段的穩(wěn)定性問題利用ANSYS進行了分析計算,結果表明鋼平臺在實際提升過程中不會發(fā)生平面外失穩(wěn)。實際施工時,鋼平臺在澆完第2道連廊梁板后進行拆除,所以采用生死單元法研究了施工第2道梁板時鋼平臺的受力性能,得出結論：以承受第1道連廊梁板的施工來設計鋼平臺是可行的,且鋼平臺在施工完第2道梁板后再進行拆除也是可行的。最后,文章還論述了鋼平臺整體提升過程的控制與監(jiān)測措施。本文的研究,希望能為類似高空多層混凝土連廊的施工提供借鑒和參考。
[Abstract]:The structure of the high-altitude corridor is a new type of structure that has gradually developed in the past two decades. Due to its unique and functional diversity, more and more designers favor the suspended structure. In this paper, based on the construction of the high-altitude multi-layer concrete corridor in the intelligent building of Yangzhou, this paper, on the basis of the comparison and analysis of several methods of construction formwork, has determined the bearing structure of the space steel frame as the formwork platform for the continuous corridor construction. The problems of the design and selection of the steel platform and the steel leg are studied in this paper. In this paper, the structural type of the above-bearing space steel frame structure is determined as the structure of the formwork steel platform, and the natural vibration characteristics of the structure are also analyzed by analyzing the upper and lower bearing types and the diagonal braces of the space steel frame structure of the two support modes. Considering that the bearing counterforce of the use stage of the steel platform is large, the design of the support leg is a double-web box-type bull leg with strong shear capacity. In addition, the influence of the steel platform on the structure of the built-in main body in the use stage is also studied, and the measures for strengthening the tensile stress are also taken. (2) The removal period of the formwork steel platform. In this paper, according to a certain analysis method, the design of the scaffold layout in the first lane of the first corridor is designed and the basic load information is determined, and then the stress behavior of the whole structure of the semi-rigid-connected steel pipe scaffold under different load conditions is analyzed by using the ANSYS. By introducing the supporting reaction force of the scaffold into the whole model of the first corridor beam plate and the main body structure, the stress performance of the first corridor beam slab under the 10-d age is checked, and the results show that the deformation of each rod meets the requirements, However, if the bearing capacity of the secondary beam does not meet the requirements, the secondary beam shall be strengthened. After the secondary beam is strengthened, the steel platform can be removed by the construction of the first corridor beam and slab in theory, but in the actual construction process, in order to ensure the project quality and safety, the steel platform shall be removed after the second beam and slab concrete is to be poured. (3) The installation of the formwork steel platform. As the formwork steel platform for the construction of the high-altitude concrete continuous corridor of the project is a space steel frame structure, the common mounting scheme of the steel frame is various, and according to the actual situation of the construction site, the two installation schemes of the support die steel platform are selected, and the multi-index comprehensive comparison is carried out on the two schemes, The integral lifting method with the most obvious advantages is finally determined to install and remove the formwork steel platform. In addition, the paper analyzes and solves some technical difficulties in the lifting process of the project, and gives the concrete idea of overall lifting and installation. (4) Control problems during the construction of the formwork steel platform. First, based on the evaluation index of the calculation results, the most reasonable 8-point scheme is determined from the three-point arrangement scheme. After the position and the number of the known lifting points are known, the control problem of the limit of the lifting displacement difference is studied in two cases, and the limit of the displacement difference between the lifting points is determined to be equal to 30 mm after comparison. Then, the stability problem of the steel platform in the lifting stage is analyzed and calculated by using the ANSYS, and the result shows that the steel platform will not lose out-of-plane instability in the actual lifting process. In the actual construction, the steel platform is removed after the second corridor beam slab is poured, so the force performance of the steel platform is studied by the life-and-death unit method, and it is concluded that the steel platform is feasible to design the steel platform with the construction of the first corridor beam slab. And the steel platform is also feasible after the construction of the second beam slab. Finally, the paper also discusses the control and monitoring measures of the whole lifting process of the steel platform. The research of this paper is to provide reference and reference for the construction of similar high-altitude multi-layer concrete corridor.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU755;TU974

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