现浇箱梁挂篮施工方案

叉河特大桥位于K104+242位置处,为左右分离式，其中左幅布置形式为为25+75+130+75+3×25m，右幅布置形式为75+130+75+3×25m的箱型变截面预应力T型连续刚构桥,箱梁根部高7.5m，跨中高2.6m,箱梁高为梁中线位置的高度，边中跨比较小为0.5769，这样将有利于箱梁内的应力合理分布，左右侧高度不一，臂长度为3.5m。
    施工中需要随时对挂篮悬吊系统进行调整，箱梁底板按照R=351.659m变化，底板顶面按照R=391.092m变化，系按照圆曲线变化，这样设计的目的是减少墩顶的弯矩数值，相应减少主梁内的主拉应力。箱梁采取挂篮悬臂浇筑施工,最大施工悬臂长度为58.5m，最大悬浇重量为142.9t，按照设计的施工顺序为:先在墩身托架上浇筑0#段,后向两边逐段悬臂浇筑并张拉预应力束,先边跨合拢,再中跨合拢,整个施工过程相邻浇筑节段对称进行。和拢时桥梁由T形静定悬臂状态变为超静定状态，实现了体系转换。
砼采用拌合站集中拌制,利用HBT-60型混凝土输送泵垂直泵送进行箱梁施工.在左2#（右1#）及左3#（右2#）墩柱位置各布置8t塔吊1台垂直运输材料、小型设备、机具等。
叉河特大桥施工总工期控制在25个月内。阶段目标为：2005年5月前完成桩基础施工，2005年11月前完成墩柱施工，2006年10月前完成T构悬
Cradle Cast construction plan

Fork River Bridge at K104 +242 position of Department, separate left and right, which left for the site layout for the 25 +75 +130 +75 +3 × 25m, the right site layout for the 75 +130 +75 +3 × 25m of Box T-tapered prestressed continuous rigid frame bridge, box girder high root 7.5m, high span 2.6m, height box beam midline height of the cross-border small as 0.5769, this will be beneficial in Box reasonable distribution of the stress and left side, different height, arm length is 3.5m.
    Construction needs to be kept on the cradle suspension system to adjust, bottom slab in accordance with the R = 351.659m change, the top floor in accordance with R = 391.092m change system in accordance with the circular curve, it is designed to reduce the pier top moment value, a corresponding reduction in the main beam in the main tensile stress. Cantilever box beam construction to Cradle, the biggest construction boom length of 58.5m, the largest Cantilever weight 142.9t, according to the design of the construction sequence is: first pier bracket placement 0 # section, then paragraph by paragraph to both sides of the cantilever placement and prestressed beam, the first Cross Close, and then the cross-fold, the entire construction process symmetric to the adjacent segment placement. And the rope bridge by the T-shaped when Static cantilever into indeterminate state, to achieve a system conversion.
Concentration by mixing concrete mixing plant, using HBT-60-type concrete pump vertical pump for box girder. # 2 in the left (right 1 #) and left 3 # (right 2 #), position the layout of 8t crane Pier 1 set of vertical transport of materials, small equipment, machinery and so on.
Fork River bridge construction control the total duration of 25 months. Stage goal: in May 2005 to complete construction of pile foundation, in November 2005 before the completion of pier construction, completed in October 2006 suspended T structure
Cradle Cast construction plan

Fork River Bridge at K104 +242 position of Department, separate left and right, which left for the site layout for the 25 +75 +130 +75 +3 × 25m, the right site layout for the 75 +130 +75 +3 × 25m of Box T-tapered prestressed continuous rigid frame bridge, box girder high root 7.5m, high span 2.6m, height box beam midline height of the cross-border small as 0.5769, this will be beneficial in Box reasonable distribution of the stress and left side, different height, arm length is 3.5m.
    Construction needs to be kept on the cradle suspension system to adjust, bottom slab in accordance with the R = 351.659m change, the top floor in accordance with R = 391.092m change system in accordance with the circular curve, it is designed to reduce the pier top moment value, a corresponding reduction in the main beam in the main tensile stress. Cantilever box beam construction to Cradle, the biggest construction boom length of 58.5m, the largest Cantilever weight 142.9t, according to the design of the construction sequence is: first pier bracket placement 0 # section, then paragraph by paragraph to both sides of the cantilever placement and prestressed beam, the first Cross Close, and then the cross-fold, the entire construction process symmetric to the adjacent segment placement. And the rope bridge by the T-shaped when Static cantilever into indeterminate state, to achieve a system conversion.
Concentration by mixing concrete mixing plant, using HBT-60-type concrete pump vertical pump for box girder. # 2 in the left (right 1 #) and left 3 # (right 2 #), position the layout of 8t crane Pier 1 set of vertical transport of materials, small equipment, machinery and so on.
Fork River bridge construction control the total duration of 25 months. Stage goal: in May 2005 to complete construction of pile foundation, in November 2005 before the completion of pier construction, completed in October 2006 suspended T structure
Cradle Cast construction plan

Fork River Bridge at K104 +242 position of Department, separate left and right, which left for the site layout for the 25 +75 +130 +75 +3 × 25m, the right site layout for the 75 +130 +75 +3 × 25m of Box T-tapered prestressed continuous rigid frame bridge, box girder high root 7.5m, high span 2.6m, height box beam midline height of the cross-border small as 0.5769, this will be beneficial in Box reasonable distribution of the stress and left side, different height, arm length is 3.5m.
    Construction needs to be kept on the cradle suspension system to adjust, bottom slab in accordance with the R = 351.659m change, the top floor in accordance with R = 391.092m change system in accordance with the circular curve, it is designed to reduce the pier top moment value, a corresponding reduction in the main beam in the main tensile stress. Cantilever box beam construction to Cradle, the biggest construction boom length of 58.5m, the largest Cantilever weight 142.9t, according to the design of the construction sequence is: first pier bracket placement 0 # section, then paragraph by paragraph to both sides of the cantilever placement and prestressed beam, the first Cross Close, and then the cross-fold, the entire construction process symmetric to the adjacent segment placement. And the rope bridge by the T-shaped when Static cantilever into indeterminate state, to achieve a system conversion.
Concentration by mixing concrete mixing plant, using HBT-60-type concrete pump vertical pump for box girder. # 2 in the left (right 1 #) and left 3 # (right 2 #), position the layout of 8t crane Pier 1 set of vertical transport of materials, small equipment, machinery and so on.
Fork River bridge construction control the total duration of 25 months. Stage goal: in May 2005 to complete construction of pile foundation, in November 2005 before the completion of pier construction, completed in October 2006 suspended T structure
Cradle Cast construction plan

Fork River Bridge at K104 +242 position of Department, separate left and right, which left for the site layout for the 25 +75 +130 +75 +3 × 25m, the right site layout for the 75 +130 +75 +3 × 25m of Box T-tapered prestressed continuous rigid frame bridge, box girder high root 7.5m, high span 2.6m, height box beam midline height of the cross-border small as 0.5769, this will be beneficial in Box reasonable distribution of the stress and left side, different height, arm length is 3.5m.
    Construction needs to be kept on the cradle suspension system to adjust, bottom slab in accordance with the R = 351.659m change, the top floor in accordance with R = 391.092m change system in accordance with the circular curve, it is designed to reduce the pier top moment value, a corresponding reduction in the main beam in the main tensile stress. Cantilever box beam construction to Cradle, the biggest construction boom length of 58.5m, the largest Cantilever weight 142.9t, according to the design of the construction sequence is: first pier bracket placement 0 # section, then paragraph by paragraph to both sides of the cantilever placement and prestressed beam, the first Cross Close, and then the cross-fold, the entire construction process symmetric to the adjacent segment placement. And the rope bridge by the T-shaped when Static cantilever into indeterminate state, to achieve a system conversion.
Concentration by mixing concrete mixing plant, using HBT-60-type concrete pump vertical pump for box girder. # 2 in the left (right 1 #) and left 3 # (right 2 #), position the layout of 8t crane Pier 1 set of vertical transport of materials, small equipment, machinery and so on.
Fork River bridge construction control the total duration of 25 months. Stage goal: in May 2005 to complete construction of pile foundation, in November 2005 before the completion of pier construction, completed in October 2006 suspended T structure
Cradle Cast construction plan

Fork River Bridge at K104 +242 position of Department, separate left and right, which left for the site layout for the 25 +75 +130 +75 +3 × 25m, the right site layout for the 75 +130 +75 +3 × 25m of Box T-tapered prestressed continuous rigid frame bridge, box girder high root 7.5m, high span 2.6m, height box beam midline height of the cross-border small as 0.5769, this will be beneficial in Box reasonable distribution of the stress and left side, different height, arm length is 3.5m.
    Construction needs to be kept on the cradle suspension system to adjust, bottom slab in accordance with the R = 351.659m change, the top floor in accordance with R = 391.092m change system in accordance with the circular curve, it is designed to reduce the pier top moment value, a corresponding reduction in the main beam in the main tensile stress. Cantilever box beam construction to Cradle, the biggest construction boom length of 58.5m, the largest Cantilever weight 142.9t, according to the design of the construction sequence is: first pier bracket placement 0 # section, then paragraph by paragraph to both sides of the cantilever placement and prestressed beam, the first Cross Close, and then the cross-fold, the entire construction process symmetric to the adjacent segment placement. And the rope bridge by the T-shaped when Static cantilever into indeterminate state, to achieve a system conversion.
Concentration by mixing concrete mixing plant, using HBT-60-type concrete pump vertical pump for box girder. # 2 in the left (right 1 #) and left 3 # (right 2 #), position the layout of 8t crane Pier 1 set of vertical transport of materials, small equipment, machinery and so on.
Fork River bridge construction control the total duration of 25 months. Stage goal: in May 2005 to complete construction of pile foundation, in November 2005 before the completion of pier construction, completed in October 2006 suspended T structure
Cradle Cast construction plan

Fork River Bridge at K104 +242 position of Department, separate left and right, which left for the site layout for the 25 +75 +130 +75 +3 × 25m, the right site layout for the 75 +130 +75 +3 × 25m of Box T-tapered prestressed continuous rigid frame bridge, box girder high root 7.5m, high span 2.6m, height box beam midline height of the cross-border small as 0.5769, this will be beneficial in Box reasonable distribution of the stress and left side, different height, arm length is 3.5m.
    Construction needs to be kept on the cradle suspension system to adjust, bottom slab in accordance with the R = 351.659m change, the top floor in accordance with R = 391.092m change system in accordance with the circular curve, it is designed to reduce the pier top moment value, a corresponding reduction in the main beam in the main tensile stress. Cantilever box beam construction to Cradle, the biggest construction boom length of 58.5m, the largest Cantilever weight 142.9t, according to the design of the construction sequence is: first pier bracket placement 0 # section, then paragraph by paragraph to both sides of the cantilever placement and prestressed beam, the first Cross Close, and then the cross-fold, the entire construction process symmetric to the adjacent segment placement. And the rope bridge by the T-shaped when Static cantilever into indeterminate state, to achieve a system conversion.
Concentration by mixing concrete mixing plant, using HBT-60-type concrete pump vertical pump for box girder. # 2 in the left (right 1 #) and left 3 # (right 2 #), position the layout of 8t crane Pier 1 set of vertical transport of materials, small equipment, machinery and so on.
Fork River bridge construction control the total duration of 25 months. Stage goal: in May 2005 to complete construction of pile foundation, in November 2005 before the completion of pier construction, completed in October 2006 suspended T structure
Cradle Cast construction plan

Fork River Bridge at K104 +242 position of Department, separate left and right, which left for the site layout for the 25 +75 +130 +75 +3 × 25m, the right site layout for the 75 +130 +75 +3 × 25m of Box T-tapered prestressed continuous rigid frame bridge, box girder high root 7.5m, high span 2.6m, height box beam midline height of the cross-border small as 0.5769, this will be beneficial in Box reasonable distribution of the stress and left side, different height, arm length is 3.5m.
    Construction needs to be kept on the cradle suspension system to adjust, bottom slab in accordance with the R = 351.659m change, the top floor in accordance with R = 391.092m change system in accordance with the circular curve, it is designed to reduce the pier top moment value, a corresponding reduction in the main beam in the main tensile stress. Cantilever box beam construction to Cradle, the biggest construction boom length of 58.5m, the largest Cantilever weight 142.9t, according to the design of the construction sequence is: first pier bracket placement 0 # section, then paragraph by paragraph to both sides of the cantilever placement and prestressed beam, the first Cross Close, and then the cross-fold, the entire construction process symmetric to the adjacent segment placement. And the rope bridge by the T-shaped when Static cantilever into indeterminate state, to achieve a system conversion.
Concentration by mixing concrete mixing plant, using HBT-60-type concrete pump vertical pump for box girder. # 2 in the left (right 1 #) and left 3 # (right 2 #), position the layout of 8t crane Pier 1 set of vertical transport of materials, small equipment, machinery and so on.
Fork River bridge construction control the total duration of 25 months. Stage goal: in May 2005 to complete construction of pile foundation, in November 2005 before the completion of pier construction, completed in October 2006 suspended T structure