【摘要】：頂推施工法具有設(shè)備簡單、無支架、安全、施工工期短、技術(shù)含量高、優(yōu)質(zhì)、無干擾等特點。我國頂推施工法最早應(yīng)用于預(yù)應(yīng)力混凝土橋梁,施工技術(shù)已經(jīng)日益完善,但橋梁在施工過程中受力復(fù)雜,有必要對其施工過程進(jìn)行模擬。本文所采用的頂推施工技術(shù)在傳統(tǒng)頂推上進(jìn)行了改進(jìn),吸收了國內(nèi)外先進(jìn)的頂推技術(shù)經(jīng)驗,完善了我國對頂推施工法的研究,為同類型工程特點的橋梁施工提供借鑒意義。本文以7孔16m連續(xù)梁橋為工程背景,對混凝土連續(xù)梁頂推技術(shù)以及施工工藝進(jìn)行闡述;并分析了該橋在頂推過程中的受力和變形。主要研究內(nèi)容和取得的成果如下:(1)根據(jù)7孔16m連續(xù)梁橋地理位置、工程特點等因素,研制了一套頂推設(shè)計方案。提出了“既有線路外側(cè)橋位支架預(yù)制、步履式多點縱向轉(zhuǎn)向頂推”的頂推設(shè)計構(gòu)思。(2)詳細(xì)介紹了頂推施工工藝在7孔16m連續(xù)梁橋的應(yīng)用。設(shè)計了頂推施工的結(jié)構(gòu)和裝置,提出沿圓曲線弦線頂推的構(gòu)思,并研制了可調(diào)約束滑道,創(chuàng)新了沿曲線軌跡頂推的施工方法。(3)采用大型有限元分析軟件Midas Civil建立了7孔16m連續(xù)梁橋的計算模型,分別對主梁和導(dǎo)梁整體安全性進(jìn)行了分析和驗算,以及它們的關(guān)鍵截面進(jìn)行了受力分析;找出了各個臨時墩支反力在頂推過程中的變化規(guī)律,并分析其穩(wěn)定性和結(jié)構(gòu)受力性能。結(jié)果表明,該橋的安全性和穩(wěn)定性均滿足要求。
[Abstract]:The push-push construction method is characterized by simple equipment, no support, safety, short construction period, high technical content, high quality and no interference. The push-push construction method was first applied to prestressed concrete bridges in our country. The construction technology has been improved day by day, but the construction process of the bridge is complicated in the process of construction, so it is necessary to simulate the construction process of the bridge. The jacking construction technology adopted in this paper has been improved on the traditional pushing, absorbing the advanced experience of the pushing technology at home and abroad, perfecting the research of the pushing construction method in our country, and providing reference significance for the bridge construction with the same type of engineering characteristics. Taking 7 holes 16m continuous beam bridge as the engineering background, this paper expounds the pushing technology and construction technology of concrete continuous beam, and analyzes the force and deformation of the bridge during the process of pushing. The main research contents and achievements are as follows: (1) according to the geographical location and engineering characteristics of the 7-hole 16m continuous beam bridge, a set of thrust design scheme is developed. This paper puts forward the design conception of "prefabrication of support at the lateral bridge position of existing line and multi-point longitudinal steering push with step". (2) the application of jacking construction technology in 7-hole 16m continuous beam bridge is introduced in detail. The structure and device of pushing construction are designed, the idea of pushing up along circular curve string is put forward, and the adjustable constrained slide path is developed. The construction method of pushing up along the curve trajectory is innovated. (3) the calculation model of the 7-hole 16m continuous beam bridge is established by using the large-scale finite element analysis software Midas Civil, and the overall safety of the main beam and the guide beam is analyzed and checked respectively. And their key sections are analyzed. The variation law of the reaction force of each temporary pier in the process of pushing is found out, and its stability and the mechanical performance of the structure are analyzed. The results show that the safety and stability of the bridge meet the requirements.
【學(xué)位授予單位】：煙臺大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U445.462

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