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济南市八一立交桥系苜蓿叶形三层互通式立交桥,于1988年1月18日开工,当年8月1日建成通车,比计划要求提前2个月竣工,全部项目质量经验收合格,这与施工中采用新技术是分不开的,特别是由于成功地使用了NC-Ⅱ负温早强剂。工程开工时正值冬季,在负温下进行7000余件混凝土构件的预制,总量达2600m~3,而我公司仅有租借的预制场地11300m~2,如设置蒸养室,须加大投资,且延误工期。仅预制倒T形梁234根一项,按1月初开工,3月底吊装的要求,实际有效工期仅90d左右,
The Jinan Bayi Overpass was a three-layer interchange bridge with a loquat leaf shape. It was started on January 18, 1988, and was opened to traffic on August 1 of that year. It was completed 2 months earlier than planned, and all project quality experiences were qualified. The use of new technologies in construction is inseparable, especially due to the successful use of NC-II negative temperature early strength agents. When the project starts, it is in winter. Under the negative temperature, more than 7,000 prefabricated concrete components are prefabricated, and the total amount reaches 2600m~3. However, our company only rents the prefabricated site 11300m~2. If the steaming room is set up, investment must be increased. , And delay the construction period. Only 234 inverted T-shaped beams were prefabricated. Starting from the beginning of January, the requirements for hoisting at the end of March were only about 90 days.