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高应力状态下无粘结预应力混凝土楼板如何开洞、预应力筋如何放张松驰、预应力如何重建、开洞后如何维持原设计要求等问题，必须认真研究，才能确保工程结构安全。１９９７年，山东济南鲁能大厦要求在已建成的８ｍ×８ｍ双向无粘结预应力板上开设电梯孔洞（３ｍ×３ｍ，共２层
How to open holes in unbonded prestressed concrete floor slabs in high stress state, how to loosen prestressed tendons, how to rebuild prestressing forces, how to maintain the original design requirements after opening holes, etc., must be carefully studied to ensure the safety of the engineering structure. In 1997, Shandong Jinan Luneng Building required the opening of an elevator hole of 8m×8m bidirectional unbonded prestressed plates (3m×3m, total 2 layers)