【摘要】：近年來我國城鎮(zhèn)化進程加快,隨著城市規(guī)模的不斷擴大,地下基礎(chǔ)設(shè)施建設(shè)滯后、城市管網(wǎng)系統(tǒng)落后所產(chǎn)生的災(zāi)害在我國許多大中城市中頻發(fā),嚴重制約了城市的進一步發(fā)展。為解決這一難題,2015年8月,我國開始全面推動城市地下綜合管廊建設(shè)。鄭州市金水路西延高壓輸電線路架空入地改造工程是鄭州市地下綜合管廊建設(shè)的一部分,該工程全程采用頂管法施工,內(nèi)徑3.5米,外徑4.14米,這是鄭州市在建的最大口徑的電力管廊頂進施工工程項目。本文結(jié)合此工程7#—8#井曲線頂管施工區(qū)間,利用工程中積累的經(jīng)驗和實測數(shù)據(jù),對工程施工中大口徑雙曲線管廊頂進施工關(guān)鍵技術(shù)、管道在土中的受力、以及大口徑雙曲線管廊頂進的頂推力計算進行應(yīng)用研究。具體研究內(nèi)容如下:⑴總結(jié)了大口徑曲線頂管的研究現(xiàn)狀,對工程基本概況和工程難點進行闡述,簡單介紹了管廊曲線頂進的基本理論、施工方法和施工工藝。⑵以金水路西延高壓輸電線路架空入地改造工程Ⅳ標段7#—8#井工程區(qū)間為研究背景,對頂管施工中頂管機選型、施工工藝的選擇、觸變泥漿減阻措施、管節(jié)之間的接頭處理、中繼間的設(shè)置、后背墻穩(wěn)定性驗算、頂進過程中的糾偏措施等重要和新穎技術(shù)進行應(yīng)用研究。并計算出在頂進曲線段全截面接觸時允許頂力值為31240 kN,大偏心狀態(tài)下DN3500曲線頂管的允許頂力大小隨著張口高度增加而減小。⑶計算出本工程場地管頂土層C、φ的加權(quán)平均值為18.13kN/m~2和27.29°,分別使用土柱理論和土拱理論計算深埋頂管管頂豎向土壓力,得出結(jié)果相差20%以上,并利用ABAQUS有限元軟件建立平面應(yīng)力應(yīng)變模型,分析管節(jié)在土中所受土壓力,并與計算所得土壓力大小作對比,得出在鄭州市粉土地區(qū)計算深埋頂管土壓力計算需要考慮土拱效應(yīng)。⑷通過對頂管進行受力分析計算,推導頂力計算公式并估算出頂管頂力的頂推力大小,并將其與實測頂力值進行對比分析,得出一種適用于本工程大口徑雙曲線管廊頂進的頂推力計算公式。
[Abstract]:In recent years, the process of urbanization in China has accelerated. With the continuous expansion of urban scale, the construction of underground infrastructure lags behind, and the disasters caused by the backwardness of urban pipe network system occur frequently in many large and medium-sized cities in China, which seriously restricts the further development of cities. In order to solve this problem, in August 2015, China began to promote the construction of urban underground integrated pipe gallery in an all-round way. Zhengzhou Jinshui Road West extension High Voltage Transmission Line overhead ground entry Reconstruction Project is a part of Zhengzhou underground integrated pipe corridor construction, the whole project is constructed by pipe jacking method, the inner diameter is 3.5 meters, the outer diameter is 4.14 meters. This is Zhengzhou City under construction of the largest caliber power pipe gallery jacking construction project. In this paper, based on the curve pipe jacking construction interval of well 7 / 8, using the experience and measured data accumulated in the project, the key technology of large diameter hyperbolic pipe corridor jacking construction and the force of pipeline in soil are used in the construction of this project. And the application of the top thrust calculation of large caliber hyperbolic pipe gallery jacking is studied. The specific research contents are as follows: 1 the research status of large caliber curved pipe jacking is summarized, the basic situation and difficulties of the project are described, and the basic theory of pipe corridor curve jacking is briefly introduced. Construction method and construction technology. 2 based on the research background of No. 7 # well section IV of Jinshui Road West extension High Voltage Transmission Line Reconstruction Project, the type selection of pipe jacking machine and the selection of construction technology in pipe jacking construction are taken as the research background. Some important and novel techniques, such as resistance reduction measures of thixoplastic mud, joint treatment between pipe joints, setting up between relays, stability checking calculation of back wall, deviation correction measures in jacking process, etc., are studied in this paper. It is calculated that the allowable top force of DN3500 curve pipe jacking decreases with the increase of opening height when the allowable top force value is 31240 kN, when the full section contact of the jacking curve section is in contact with the full section of the jacking curve section. 3 the pipe top soil layer C of the project site is calculated. The weighted average value of 蠁 is 18.13kN/m~2 and 27.29 擄. The vertical earth pressure at the top of deep buried pipe is calculated by using soil column theory and soil arch theory, and the difference is more than 20%. The plane stress and strain model is established by ABAQUS finite element software. The earth pressure of pipe joint in soil is analyzed and compared with the calculated earth pressure. It is concluded that the soil arch effect should be considered in the calculation of deep buried pipe earth pressure in silt area of Zhengzhou. 4 by analyzing and calculating the force of pipe jacking, The calculation formula of top force is derived and the top thrust of pipe jacking force is estimated, and compared with the measured top force value, a kind of top thrust calculation formula suitable for large diameter hyperbolic pipe gallery jacking in this project is obtained.
【學位授予單位】：河南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU990.3

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