世界桥梁
世界橋樑
세계교량
WORLD BRIDGE
2014年
6期
36-40
,共5页
预应力钢筋混凝土桥%节段预制%短线法%预制线形%非线性最小二乘%误差处理
預應力鋼觔混凝土橋%節段預製%短線法%預製線形%非線性最小二乘%誤差處理
예응력강근혼응토교%절단예제%단선법%예제선형%비선성최소이승%오차처리
prestressed reinforced concrete bridge%segmental precasting%short-line method%non-linear least square%error handling
对于采用短线法节段预制拼装施工的预应力钢筋混凝土桥，节段预制过程中较小的误差都可能导致成桥线形较大的偏差。为控制短线法节段预制过程中产生的误差，以嘉绍大桥北岸引桥（为13联70 m跨预应力混凝土连续刚构桥，主梁为单箱双室斜腹板箱梁，采用短线法节段预制拼装施工）为背景，在对预制线形控制原理研究的基础上，提出基于非线性最小二乘的综合误差处理方法，并编制线形控制系统BSRI＿SLCS。该方法首先计算理论预制线形，其次建立预制线形整体坐标系与节段局部坐标系，实现节段控制点坐标在不同坐标系中的变换，然后根据实测数据进行误差分析，调整匹配节段的位置。该方法在嘉绍大桥北岸引桥短线法施工中应用结果显示，成桥线形与理论线形较为接近，证明该方法对预制线形控制是可行的。
對于採用短線法節段預製拼裝施工的預應力鋼觔混凝土橋，節段預製過程中較小的誤差都可能導緻成橋線形較大的偏差。為控製短線法節段預製過程中產生的誤差，以嘉紹大橋北岸引橋（為13聯70 m跨預應力混凝土連續剛構橋，主樑為單箱雙室斜腹闆箱樑，採用短線法節段預製拼裝施工）為揹景，在對預製線形控製原理研究的基礎上，提齣基于非線性最小二乘的綜閤誤差處理方法，併編製線形控製繫統BSRI＿SLCS。該方法首先計算理論預製線形，其次建立預製線形整體坐標繫與節段跼部坐標繫，實現節段控製點坐標在不同坐標繫中的變換，然後根據實測數據進行誤差分析，調整匹配節段的位置。該方法在嘉紹大橋北岸引橋短線法施工中應用結果顯示，成橋線形與理論線形較為接近，證明該方法對預製線形控製是可行的。
대우채용단선법절단예제병장시공적예응력강근혼응토교，절단예제과정중교소적오차도가능도치성교선형교대적편차。위공제단선법절단예제과정중산생적오차，이가소대교북안인교（위13련70 m과예응력혼응토련속강구교，주량위단상쌍실사복판상량，채용단선법절단예제병장시공）위배경，재대예제선형공제원리연구적기출상，제출기우비선성최소이승적종합오차처리방법，병편제선형공제계통BSRI＿SLCS。해방법수선계산이론예제선형，기차건립예제선형정체좌표계여절단국부좌표계，실현절단공제점좌표재불동좌표계중적변환，연후근거실측수거진행오차분석，조정필배절단적위치。해방법재가소대교북안인교단선법시공중응용결과현시，성교선형여이론선형교위접근，증명해방법대예제선형공제시가행적。
For the prestressed reinforced concrete bridge constructed by short‐line segmental precasting and assembling method ,even minor errors in the segmental precast process is possible to induce greater geometry deviation of the completed bridge .To control the deviation developing during the process of short‐line segmental precasting ,the north approach of Jiashao Bridge is taken as the study background .The approach is a prestressed concrete continuous rigid‐frame bridge with 13 units of 70 m long spans ,the main girder adopts the double cell single box girder with ob‐lique webs ,erected by short‐line segmental precasting and assembling construction .Based on the study of the theory of precasting geometry control ,the integral error handling method based on the least square method was put forward and the geometry control system BSRI‐SLCS was pro‐grammed .In this method ,the first step is to calculate the theoretical precasting geometry ,and then to establish the global coordinate system of the precasting geometry and the local coordinates of each section ,so as to realize the conversion of coordinates of the segmental control points in dif‐ferent coordinate systems .The next step is to do error analysis in accordance with the measured data and adjust the locations of the matched sections .By using this method ,the geometrical shape of the completed north approach of Jiashao Bridge is close to the designed geometrical shape ,pro‐ving that this method is feasible to the control of precasting geometry .
