某会议中心交叉预应力梁施工控制技术

Construction Controlling Technology of Cross Prestressed Beam of Some Conference Center

四川国际网球中心会议中心某会议室同时采用大跨度和悬挑预应力结构,形成交叉预应力梁结构。其中悬挑预应力梁采用一端锚固、一端张拉的施工工艺,大跨度预应力梁采用两端张拉的方式。结合交叉预应力梁的特点及难点,重点介绍了波纹管埋设及预应力张拉技术,同时给出张拉控制应力及张拉伸长值计算公式,指出实际伸长值与计算伸长值偏差应控制在±6%。另外指出施工张拉完成拆除支撑系统后,需要对交叉预应力梁进行变形观测以确保整体质量。

Some meeting room of Sichuan International Tennis Center applies large-span and cantilever prestressed structure simultaneously to form cross prestressed beam structure. The construction technology of anchorage for one side and tension for another side is adopted for cantilever prestressed beam, but tension for two sides for larger-span prestressed beam. Combining with the characteristics and difficulties, the technologies of corrugated pipe embedding and prestress tension are introduced in detail, and the formulas for tension controlling stress and elongation value are given out. It is pointed out that the deviation between actual and calculating elongation values must be enntrolled in ± 6%. In order to assure the quality, deformation monitoring is necessary for cross prestressed beam after tension and demolition of support system.