“二次张拉工艺”在制梁工程中的应用

• 出 处: 桥梁建设
• 发表日期: 1993年03期
• 关键词: 张拉工艺 梁体混凝土 工形梁 蒸汽养护 次张 混凝土入模 钢束 设计控制 蒸养 大沽河

济南—青岛高速公路大沽河桥30m简支工形梁制梁采用了“二次张拉工艺。其蒸汽养护温度为40℃,在混凝土入模温度为15℃时蒸养38小时,梁体强度即达到60%设计强度。一般地,梁体混凝土强度达到80%～85%设计强度时,首次张拉80%～85%钢束到设计控制吨位的80%～85%,即可将梁体移出制梁基座,使基座周转率提高三倍以上,制梁速度大大提高。

Jinan - Qingdao Highway Daguhe Bridge 30m simply supported beam beam beam used the "second tensioning process. The steam curing temperature is 40 ℃, the concrete into the mold temperature of 15 ℃ when the steam curing 38 hours, the beam body The strength is 60% of the design strength.Generally, the strength of the concrete beam to reach 80% ~ 85% design strength, the first 80% ~ 85% of the steel beam tension to design control tonnage of 80% to 85%, you can beam Body out of the beam base, so that the base turnover rate increased more than three times, beam speed greatly increased.