圆端形沉井内力比较

Comparison of internal forces of round tip shape caissons

在沉井截面设计中,针对双孔圆端形截面,通过等截面内力计算得知隔墙与沉井连续处弯矩最大,考虑在隔墙与沉井连续处采用变截面。为节省材料和成本,寻求合理截面,采用等截面与变截面2种截面形式进行设计。以所给工程为例,通过编制电算程序,计算双孔圆端形沉井等截面与变截面的内力,比较和分析2种截面在相同圆弧段半径及同矩形段长度下的内力,以寻找圆端形沉井设计的最优截面形式。

In the design of caisson section, the greatest moment of the double wall section of nose circular caisson was calculated, and variable section was adopted. To save costs and materials for a reasonable section, two section forms, the constant section and the variable section, were designed. The double wall round shape caisson was taken as an example. By coding computer program, the procedure through the establishment electricity was calculated. Torce on the constant section and the variable section of the round tip shape caisson to sunk shaft frame was calculated and compared, and the most superior section form during the design of the round tip shape caisson frame was obtained.