【摘要】：隨著我國(guó)交通建設(shè)的高速發(fā)展,我國(guó)橋梁施工技術(shù)水平也不斷提高。寬幅大跨高難度橋梁也不斷涌現(xiàn),連續(xù)梁的懸臂澆筑法也日趨成熟。本文主要是依托由中鐵十七局集團(tuán)有限公司承建,福建省三明市長(zhǎng)深高速公路連接線A3合同段馬林大橋。馬林大橋?yàn)樽笥曳蛛x錯(cuò)位布置式橋梁,右幅橋?yàn)?4×26.5+(42+76+42)+3×40+4×30)=514m的現(xiàn)澆預(yù)應(yīng)力砼連續(xù)剛構(gòu)+預(yù)應(yīng)力砼T梁橋；左幅橋?yàn)?×30+(42+76+42)+5×40+2×30=523.5m現(xiàn)澆預(yù)應(yīng)力砼連續(xù)剛構(gòu)+預(yù)應(yīng)力砼T梁橋。主橋設(shè)計(jì)為(42+76+42)=160m預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋跨越峽谷；橋面橫坡3%。箱梁斷面采用單箱雙室直腹板斷面,箱梁頂板寬25.25 m,底板寬17.25 m,懸臂長(zhǎng)度4.0m。本課題主要研究解決該橋施工中地形陡峭,施工道路復(fù)雜、運(yùn)輸條件差、現(xiàn)場(chǎng)垂直吊裝能力低；橋面設(shè)置了3%的超高橫坡,主梁為25.25m寬的單箱雙室預(yù)應(yīng)力混凝土箱梁,箱梁相鄰腹板間橋面高差達(dá)25.5cm；主橋橋面寬度25.25m,底板寬度17.25m,在掛籃走行工況下后下橫梁的兩吊點(diǎn)間距將達(dá)到25.5m以上,勢(shì)必需要大剛度下橫梁,才能滿足掛籃變形要求。如何優(yōu)化掛籃下橫梁的結(jié)構(gòu)型式或支撐(吊點(diǎn))的布置形式,實(shí)現(xiàn)減小下橫梁的截面尺寸,進(jìn)而降低整個(gè)掛籃的重量等設(shè)計(jì)難題,確保施工安全,高效及成本節(jié)約。結(jié)合馬林大橋在實(shí)際施工過(guò)程中需要解決的技術(shù)難題,采用理論分析、數(shù)值模擬、專(zhuān)家論證、室內(nèi)試驗(yàn)、現(xiàn)場(chǎng)實(shí)驗(yàn)及監(jiān)測(cè)等方法,針對(duì)馬林大橋異型三角掛籃的設(shè)計(jì)與優(yōu)化、主梁懸臂施工風(fēng)險(xiǎn)分析與風(fēng)險(xiǎn)控制四個(gè)方面進(jìn)行了研究,主要取得以下幾個(gè)方面的研究結(jié)論：(1)綜合三角和菱形掛籃各自?xún)?yōu)點(diǎn),研究設(shè)計(jì)了一種新型掛籃形式——異形三角掛籃；優(yōu)化異形三角掛籃主桁架設(shè)計(jì),主桁架的受拉構(gòu)件采用強(qiáng)度更高的16Mn鋼拉板代替以往的型鋼結(jié)構(gòu),節(jié)約鋼材；同時(shí)采用銷(xiāo)軸及螺栓聯(lián)結(jié)主構(gòu)件簡(jiǎn)化了拼裝工藝。通過(guò)三片主桁架階梯式布置和連接解決寬梁面大橫坡帶來(lái)的相鄰榀主桁架之間的高差問(wèn)題,提高了掛籃的通用性及利用率。(2)通過(guò)在掛籃底橫梁增設(shè)縱向滑移梁作為下橫梁的支撐構(gòu)件,有效減小下橫梁的受力跨度,解決了寬幅梁懸臂施工需要大剛度下橫梁的難題,同時(shí)也提高了掛籃走行過(guò)程中的安全性。(3)創(chuàng)新性地提出多榀桁架掛籃前上橫梁錯(cuò)臺(tái)鉸接連接形式(布置方法),解決了大橫坡寬幅橋面掛籃三片主桁架高差問(wèn)題,滿足了掛籃整體穩(wěn)定及走行要求。最后,通過(guò)本項(xiàng)目的研究,解決了馬林大橋同時(shí)具有高墩、超寬梁面、橋面大橫坡及運(yùn)輸?shù)跹b困難等多種因素對(duì)主橋掛籃的設(shè)計(jì)與施工提出的難題,獲得了顯著的社會(huì)經(jīng)濟(jì)效益。
[Abstract]:With the rapid development of our country's traffic construction, the bridge construction technology level of our country is also continuously improved. Wide-span, large-span and high-difficulty bridges are emerging, and the cantilever casting method of continuous beams is maturing day by day. This article is mainly relying on the construction by China Railway Seventeen Bureau Group Co., Ltd., Sanming City, Fujian Province, Changshen Expressway Link A3 contract section Malin Bridge. Ma Lin Bridge is a dislocated bridge with the left and right sides separated. On the right side, it is a cast-in-situ prestressed concrete continuous rigid frame prestressed concrete T-beam bridge with (4 脳 26.5 (4276 42) 3 脳 40 4 脳 30) = 514m. The left bridge is 3 脳 30 (427642) 5 脳 402 脳 30 脳 523.5m cast-in-situ prestressed concrete continuous rigid frame prestressed concrete T-beam bridge. The main bridge is designed to (427642) = 160m prestressed concrete continuous rigid frame bridge crossing the canyon, and the deck slope is 3%. The section of box girder is single box and double compartment straight web section, the roof width of box girder is 25.25 m, the width of bottom plate is 17.25 m, and the length of cantilever is 4.0 m. In the construction of this bridge, the terrain is steep, the construction road is complicated, the transportation condition is poor, and the vertical hoisting capacity is low. The bridge deck has 3% ultra-high cross slope, the main beam is 25.25m wide, single box and double chamber prestressed concrete box girder, and the bridge deck height difference between adjacent web of box girder is up to 25.5 cm;. The width of the deck of the main bridge is 25.25m and the width of the floor is 17.25m. Under the running condition of the hanging basket, the distance between the two hanging points of the rear lower beam will reach more than 25.5m. It is bound to require a large stiffness of the cross beam in order to meet the requirements of the deformation of the hanging basket. How to optimize the structure type of the lower beam or the arrangement form of the support (suspension point), to reduce the cross-section size of the lower beam, and then to reduce the weight of the whole hanging basket, so as to ensure the safety of construction, high efficiency and cost-saving. Combined with the technical problems needed to be solved in the actual construction process of Ma Lin Bridge, the design and optimization of the shaped triangle hanging basket of Ma Lin Bridge are designed and optimized by using the methods of theoretical analysis, numerical simulation, expert demonstration, indoor test, field experiment and monitoring, etc. The risk analysis and risk control of cantilever construction of main beam are studied in four aspects. The main conclusions are as follows: (1) the advantages of triangle and rhombic hanging basket are synthesized, and the results are as follows: (1) combining the advantages of triangle and rhombic hanging basket, In this paper, a new type of hanging basket is studied and designed, which is called special-shaped triangular hanging basket. To optimize the design of the main truss of the special-shaped triangular basket, the tensile member of the main truss is replaced by 16Mn steel drawing plate with higher strength, which saves steel, and the assembly process is simplified by using the pin shaft and bolt connection main member. Through the arrangement and connection of three main trusses, the problem of height difference between adjacent main trusses caused by wide beam and large transverse slope is solved. The generality and utilization ratio of the hanging basket are improved. (2) by adding longitudinal sliding beam to the bottom of the hanging basket as the supporting member of the lower cross beam, the force span of the lower cross beam is effectively reduced. The problem of large stiffness beam in cantilever construction of wide-width beam is solved, and the safety in walking process of hanging basket is also improved. (3) the hinge connection form (layout method) of wrong cross beam in front of truss hanging basket is put forward creatively. The problem of the height difference of three main trusses is solved, which meets the requirements of the overall stability and running of the basket. Finally, through the research of this project, the difficult problems of the design and construction of the main bridge hanging basket are solved by many factors, such as the high pier, the super wide beam surface, the large transverse slope of the bridge deck and the difficulty of transportation hoisting, etc. Remarkable social and economic benefits have been obtained.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U445.4

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