劉家峽大橋施工階段計算及纜索線形控制
發(fā)布時間：2018-10-24 22:10
【摘要】：劉家峽懸索橋是我國西北地區(qū)最大跨度的橋梁,主跨536m。它是目前國內(nèi)相同類型大跨公路橋梁中最窄的懸索橋,橋?qū)拑H15.6m,寬跨比僅為1/34.4。大橋橋塔首次采用了大直徑鋼管混凝土,直徑達(dá)3000mm,為目前世界上直徑最大的鋼管混凝土結(jié)構(gòu)。橋塔設(shè)計造型新穎美觀,采用伊斯蘭建筑風(fēng)格,獨到的體現(xiàn)了地域少數(shù)民族文化特色。該橋為536m單跨桁式加勁梁懸索橋,在設(shè)計成橋狀態(tài)下,跨中理論垂度為48.7m,垂跨比約為1:11,主纜中心距為15.6m,吊索標(biāo)準(zhǔn)間距8.0m。在施工過程中,對主纜的線形控制、特別是基準(zhǔn)索股的安裝、定位鎖定的監(jiān)測與控制是本橋線形能否達(dá)到設(shè)計要求的關(guān)鍵一環(huán)。本文對劉家峽大橋的整個施工過程進(jìn)行了跟蹤檢測研究,在施工檢測過程中,采用BNLAS進(jìn)行建模,整個施工過程共劃分為23個施工階段,隨著施工階段的不斷變化,得出了各個階段各控制點的位移以及應(yīng)力的理論數(shù)據(jù),作為在現(xiàn)場施工檢測過程中的參照標(biāo)準(zhǔn)。對現(xiàn)場施工過程實施控制點的位移監(jiān)測和控制截面的應(yīng)力監(jiān)測,將現(xiàn)場所得的實測數(shù)據(jù)與理論設(shè)計數(shù)據(jù)進(jìn)行比對、分析,從而做出相應(yīng)的調(diào)整,得出各個施工階段是否滿足設(shè)計要求的結(jié)論,對施工過程進(jìn)行了有效的監(jiān)控。理想成橋狀態(tài)結(jié)構(gòu)恒載狀態(tài)下主塔塔頂沒有偏位;對于主塔而言設(shè)計理想狀態(tài)不會產(chǎn)生彎矩。但是各跨作用于主纜的荷載并不相等,特別是施工主桁吊裝過程,中跨垂度隨主桁吊裝不斷變化,橋塔塔頂產(chǎn)生向跨中的偏移,主塔產(chǎn)生彎矩,為了保證成橋階段的索鞍位于設(shè)計位置,設(shè)計按三次頂推辦法將索鞍頂推到位,以消除橋塔的彎矩。本文對索鞍偏心安裝、施工過程進(jìn)行橋塔偏位、主纜垂度實時監(jiān)測與控制,選測適當(dāng)時機(jī)進(jìn)行頂推,對頂推量進(jìn)行現(xiàn)場實時調(diào)整,最終獲得的理想的主纜線形,橋塔的偏心彎矩也控制在了設(shè)計容許的范圍之內(nèi)。
[Abstract]:Liujiaxia suspension bridge is the largest span bridge in northwest China, with a main span of 536 m. It is the narrowest suspension bridge of the same type of long span highway bridge in China at present. The bridge width is only 15.6 m and the ratio of width to span is only 1 / 34. 4. The concrete filled steel tube (CFST) with a diameter of 3000mm is used for the first time in the tower of the bridge, which is the largest concrete filled steel tube structure in the world. The tower design is novel and beautiful, adopting Islamic architectural style, which embodies the cultural characteristics of regional minorities. The bridge is a single span truss suspension bridge with 536m span. In the design of the bridge, the theoretical sag of the span is 48.7 m, the aspect to span ratio is about 1: 11, the central distance of the main cable is 15.6 m, and the standard spacing of the slings is 8.0 m. In the construction process, the main cable alignment control, especially the installation of the reference cable strands, the monitoring and control of positioning and locking is the key to whether the alignment of the bridge can meet the design requirements. In this paper, the whole construction process of Liujiaxia Bridge is tracked and studied. In the process of construction inspection, BNLAS is used to model the model. The whole construction process is divided into 23 construction stages, which changes with the construction stage. The theoretical data of displacement and stress of each control point in each stage are obtained, which can be used as the reference standard in the field construction inspection process. The displacement monitoring of the control point and the stress monitoring of the control section are carried out in the field construction process. The measured data are compared with the theoretical design data, and the corresponding adjustment is made. The conclusion of whether each construction stage meets the design requirements is concluded, and the construction process is effectively monitored. The top of the main tower does not deviate under the dead load state of the ideal bridge structure, and the bending moment is not generated in the design of the ideal state for the main tower. However, the loads of each span acting on the main cable are not equal, especially in the process of hoisting the main truss, the sag of the middle span changes with the hoisting of the main truss, the top of the tower shifts to the middle of the span, and the bending moment of the main tower is produced. In order to ensure that the cable saddle in the bridge stage is located in the design position, the cable saddle is pushed into place according to the method of three push-ups to eliminate the bending moment of the bridge tower. In this paper, the eccentric installation of cable saddle, the misalignment of bridge tower during construction, the real-time monitoring and control of the sag of the main cable, the selection of appropriate time to push, the real time adjustment of the pushing quantity, and the final ideal main cable shape are obtained. The eccentric bending moment of the bridge tower is also controlled within the range permitted by the design.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.4;U448.25
本文編號：2292708
[Abstract]:Liujiaxia suspension bridge is the largest span bridge in northwest China, with a main span of 536 m. It is the narrowest suspension bridge of the same type of long span highway bridge in China at present. The bridge width is only 15.6 m and the ratio of width to span is only 1 / 34. 4. The concrete filled steel tube (CFST) with a diameter of 3000mm is used for the first time in the tower of the bridge, which is the largest concrete filled steel tube structure in the world. The tower design is novel and beautiful, adopting Islamic architectural style, which embodies the cultural characteristics of regional minorities. The bridge is a single span truss suspension bridge with 536m span. In the design of the bridge, the theoretical sag of the span is 48.7 m, the aspect to span ratio is about 1: 11, the central distance of the main cable is 15.6 m, and the standard spacing of the slings is 8.0 m. In the construction process, the main cable alignment control, especially the installation of the reference cable strands, the monitoring and control of positioning and locking is the key to whether the alignment of the bridge can meet the design requirements. In this paper, the whole construction process of Liujiaxia Bridge is tracked and studied. In the process of construction inspection, BNLAS is used to model the model. The whole construction process is divided into 23 construction stages, which changes with the construction stage. The theoretical data of displacement and stress of each control point in each stage are obtained, which can be used as the reference standard in the field construction inspection process. The displacement monitoring of the control point and the stress monitoring of the control section are carried out in the field construction process. The measured data are compared with the theoretical design data, and the corresponding adjustment is made. The conclusion of whether each construction stage meets the design requirements is concluded, and the construction process is effectively monitored. The top of the main tower does not deviate under the dead load state of the ideal bridge structure, and the bending moment is not generated in the design of the ideal state for the main tower. However, the loads of each span acting on the main cable are not equal, especially in the process of hoisting the main truss, the sag of the middle span changes with the hoisting of the main truss, the top of the tower shifts to the middle of the span, and the bending moment of the main tower is produced. In order to ensure that the cable saddle in the bridge stage is located in the design position, the cable saddle is pushed into place according to the method of three push-ups to eliminate the bending moment of the bridge tower. In this paper, the eccentric installation of cable saddle, the misalignment of bridge tower during construction, the real-time monitoring and control of the sag of the main cable, the selection of appropriate time to push, the real time adjustment of the pushing quantity, and the final ideal main cable shape are obtained. The eccentric bending moment of the bridge tower is also controlled within the range permitted by the design.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.4;U448.25
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