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林海公路(A20~A30)工程大治河桥为三跨预应力混凝土变截面连续箱梁,三向预应力体系、全预应力结构,跨径组合为60m+105.5m+58.5m。上下行两幅并立,下部结构墩采用桩基承台接柱式墩形式。梁高沿纵桥向变化,中支点梁高6.0m,跨高比1/17.33,边支点和跨中梁高2.4m,跨高比1/43.33。采用单箱双室直腹板箱型截面,顶宽18.75m,底宽12m,悬臂板长度3.25~3.5m。0、1号块采用支架现浇,其余的2~13号块采用挂蓝法对称悬臂浇注施工。边跨设置2m的现浇段,中跨设置4m的现浇合龙段。
Linhe Highway (A20 ~ A30) The Dazhi River Bridge is a three-span continuous box girder with variable cross-section, three-way prestressed system and full prestressed structure. The span combination is 60m + 105.5m + 58.5m. Up and down two side by side, the lower part of the pier using pile cap pier column pier form. The beam height varies along the longitudinal bridge. The mid-fulcrum beam height is 6.0m, the span ratio is 1 / 17.33, the fulcrum and the mid-beam are 2.4m high, and the span ratio is 1 / 43.33. Single box double chamber straight web box section, top width 18.75m, bottom width 12m, cantilever length 3.25 ~ 3.5m. 0,1 block cast-in-place block, the remaining 2 to 13 blocks hanging blue method symmetrical cantilever casting construction. Set 2m side of the cast-in-side cross-section, set 4m in-situ cross-section of the dragon section.