Construction Innovations in Slipforming Concrete Buildings

这一新颖研究的快速奖是用跨学科的方法调查混凝土芯子滑模的施工和设计问题。滑模是一种快速成型和浇筑混凝土的方法，使用液压顶升装置来抬高定制的模板。它使桥墩、筒仓和建筑核心的建设发生了革命性变化。主要问题是：保持模板水平；需要精确的标高测量；较厚的墙造成剥离问题；由于混凝土本身的硬化速度不均匀而导致的施工问题；精确定位许多不同形状的渗透；以及另一个主要的施工问题是混凝土核心和钢框架的公差不兼容。将探索以下想法：a)使用锥形玻璃纤维块；b)将研究垂直和水平激光的应用；c)在冬季施工的滑模混凝土中嵌入热电偶，以持续监测混凝土养护温度；d)改变每个千斤顶施加的力和改变顶层甲板上的钢筋数量，以引导核心直；以及e)将测试设计水平和垂直方向错位嵌入板的新想法。这项研究有望通过探索施工过程自动化的新方法，激发更多创造性和创新性的施工研究。研究活动不仅仅是对岩心滑移的一般学术研究。在佐治亚州亚特兰大建造IBM塔芯的Sundt公司对这项研究表示了强烈的兴趣，并同意在未来几个月为调查人员提供一个机会来研究这些问题，并探索该领域的创新想法，以保持美国滑模建筑在国际和国内市场的竞争力。

This expedited award for novel research is to investigate construction and design problems of concrete core slipforming with a cross-disciplinary approach. Slipforming is a method of rapidly forming and placing concrete using hydraulic jacking units to raise a custom-made form. It has revolutionized the construction of bridge piers, silos, and building cores. Major problems are: to keep the form level; precise elevation measurements are required; thicker walls pose a stripping problem; construction problems due to the uneven rate of hardening of the concrete itself; precisely locating many different shaped penetrations; and another major construction problem is caused by the fact that the tolerances of the concrete core and steel frame are not compatible. The following ideas will be explored: a) the use of tapered fiberglass block-outs; b) application of vertical and horizontal lasers will be investigated; c) thermocouples embedded in the concrete of winter-constructed slipforms to constantly monitor concrete temperature for curing; d) the effect of varying the forces exerted by each jacks and changing the amount of steel rebar on the top deck to steer the core straight; and e) new ideas for designing embed plates for out of placement of horizontal and vertical directions will be tested. This research is expected to stimulate more creative and innovative construction researches by exploring new methodologies for automation of construction processes. The research activity is not merely a general academic study of core slipforming. The Sundt Corp., which has built the IBM Tower Core, in Atlanta, GA has expressed a strong interest in this research, and has agreed to provide an opportunity to the investigator to study these problems during the next few months, and to explore innovative ideas in the field to maintain the competitiveness of the U.S. slipforming construction in international and domestic markets.