本文關(guān)鍵詞：掛籃懸臂澆筑鋼筋混凝土拱橋施工控制研究　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鋼筋混凝土拱橋 懸臂澆筑 施工控制 敏感性分析

【摘要】：目前，懸臂澆筑法作為一種新型的施工工藝應(yīng)用于拱橋修建過程中，該方法克服了不利地形的缺陷，使得拱橋也能像斜拉橋和連續(xù)剛構(gòu)橋那樣分階段澆筑施工，具有投資相對(duì)較少、施工方便、結(jié)構(gòu)整體性好、后期養(yǎng)護(hù)少、維修簡(jiǎn)單的優(yōu)勢(shì)。為我國(guó)西部地區(qū)拱橋的發(fā)展打開了廣闊的前景。由于懸臂澆筑法在國(guó)內(nèi)應(yīng)用較少，，工藝尚未成熟，因此建立一套合理的施工控制體系來(lái)保證拱橋懸臂施工過程的安全性、成橋線形和內(nèi)力能夠符合設(shè)計(jì)要求就顯得尤為重要。 本文在收集和研究已有國(guó)內(nèi)外資料和成果的基礎(chǔ)上，圍繞該課題的存在，進(jìn)行如下的研究工作： ①為了保證大跨度懸臂澆筑鋼筋混凝土拱橋施工過程的安全性及成橋線形和內(nèi)力能夠滿足設(shè)計(jì)要求，提出建立與其施工工藝相適應(yīng)的施工控制體系； ②在總結(jié)國(guó)內(nèi)外橋梁施工控制體系的基礎(chǔ)上，給出懸臂法施工控制體系建立的原則、施工控制建立的目的與任務(wù)及如何建立施工控制體系；并以馬蹄河特大橋?yàn)槔�，建立相關(guān)施工控制系統(tǒng)； ③采用橋梁專軟件Midas/Civil建立全橋有限元模型，考慮混凝土收縮徐變，對(duì)施工控制過程中進(jìn)行仿真計(jì)算，給出預(yù)計(jì)控制目標(biāo)狀態(tài)成橋位移、內(nèi)力等；在拱圈最大懸臂階段，對(duì)結(jié)構(gòu)的自重和抗風(fēng)穩(wěn)定性進(jìn)行了研究，得出在風(fēng)荷載對(duì)拱圈的穩(wěn)定性影響較小。 ④提出懸臂澆筑施工過程中影響施工控制目標(biāo)的關(guān)鍵問題，掛籃作為橋梁懸臂澆筑施工過程中主要承重設(shè)備，掛籃剛度及行走過程安全性是橋梁修建過程中較為關(guān)心的問題，也是影響拱圈線形的重要因素，本文通過Ansys軟件對(duì)施工過程中的主要承重設(shè)備掛籃進(jìn)行剛度檢算，并對(duì)掛籃行走系統(tǒng)抗傾覆性進(jìn)行驗(yàn)算，確保施工過程的安全性；總結(jié)索力優(yōu)化的方法，給出施工過程中的合理的調(diào)索依據(jù)、探討拱圈合攏方法及成橋后索力拆除等問題，進(jìn)行相應(yīng)的分析及總結(jié)。 ⑤對(duì)懸臂澆筑施工過程中的主要相關(guān)參數(shù)進(jìn)行敏感性分析，給出影響較大的幾種參數(shù)，在設(shè)計(jì)階段及施工控制中應(yīng)給予重視，對(duì)以后采用此方法修建的橋梁提供參考依據(jù)。
[Abstract]:At present, the cantilever pouring construction technology as a new application in bridge construction process, the method overcomes the defect of the unfavorable terrain, which can also staged construction of arch bridge as cable-stayed bridge and continuous rigid frame bridge that has a relatively small investment, convenient construction, good overall structure, less maintenance, maintenance simple advantage. Opened up broad prospects for the development of arch bridge in western region of China. Because the cantilever method rarely used in China, technology is not yet mature, therefore to establish a reasonable construction control system to ensure the safety of arch bridge cantilever construction process, the internal force and alignment of bridge can meet the design requirements is particularly important.
On the basis of collecting and studying the existing domestic and foreign data and achievements, the following research work is carried out around the existence of the subject:
(1) in order to ensure the safety of the long span cantilever casting reinforced concrete arch bridge in construction process, and the alignment and internal force of the finished bridge can meet the design requirements, a construction control system suitable for its construction technology is proposed.
Secondly, on the basis of summarizing the bridge construction control system at home and abroad, the principle of cantilever construction control system is established, the purpose and task of construction control is established, and how to set up the construction control system; and the related construction control system is built with the example of the horseshoe River Bridge.
The bridge professional software Midas/Civil to build the finite element model of the whole bridge with the consideration of concrete shrinkage and creep, the simulation of the process of construction control, given the expected control target state of bridge displacement, internal force of arch; in the largest cantilever stage, the structure deadweight and wind stability were studied, the influence of wind load on the stability of arch the smaller.
The proposed key problems for the construction process of cantilever construction control target, the hanging basket equipment as the main load-bearing bridge cantilever construction process, the hanging basket stiffness and walking safety is more concerned in the process of building a bridge, and is also an important factor affecting the shape of arch ring, this paper through the Ansys software main bearing equipment for construction in the process of hanging basket stiffness calculation, and the hanging basket walking system of anti overturning stability checking, ensure the safety of construction process; summarize the method of optimization of cable force, given the construction process of the reasonable cable adjustment basis, explore arch bridge and construction method of cable force demolition and other issues, the corresponding to analyze and summarize.
The sensitivity analysis of the main parameters in the cantilever casting process is carried out, and several parameters that are more influential are given. Attention should be paid to the design stage and construction control, which will provide a reference for the bridge constructed by this method later.

【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.22;U445.4

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本文編號(hào)：1417523