【摘要】 北京花乡工农业产品展销厅工程由于使用高度的要求，要对原１、２ 层门厅双向无粘结预应力混凝土顶板沿四周梁边全部剔除，开洞８ｍ ×７．４５ｍ 。本文从板底支撑系统的搭设、分段进行混凝土板剔除、预应力筋切断、放张、张拉端面加固处理、重新张拉等方面详细阐述了开洞的方法。更多还原

【Abstract】 In the project of Beijing Flower Village Industrial and Agricultural Product Exhibition and Sale Hall, due to the requirement of height, the two way prestress without bond concrete top slab of the entrance hall has to be rejected entirely along the beams all around on the primary first and second floors, with a 8m×7 45m hole. This paper details the holing method on the aspects of erecting of the plate bottom bracing system, rejecting of the concrete slab in sections, the cutting and relaxing of the prestressed reinforcement, treatment of tension end surface strengthening and restretching.更多还原