The high life: Locating the floors of America’s tallest residential building

案例分析

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Author:T/F/D

在曼哈顿的“亿万富翁的行”上,新的纽约摩天大楼近乎完成。中央公园塔(Central Park Tower)高到1,550英尺(472米),是世界上最高的住宅建筑,是该市第二高的建筑物,仅次于一个世界贸易中心。施工始于2014年,Pinnacle Industries II,LLC于2016年安装了核心超级攀岩成型系统。由于建筑物的高度,Pinnacle Industries II的调查工程师Robert Mandelbaum使用了GPS解决方案 - Leica Geosystems GNSS GNSS System-系统 -找到每个新楼层的布局。


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A new approach to monitoring

Central Park Tower will contain 179 homes with one of the most expensive views in the world. 300 feet (over 91 metres) above the street, the Tower cantilevers to the east, creating views of Central Park for all north-facing residents. The elegant exterior gives away nothing of the complexity of the construction or the challenges of keeping the building’s footprint consistent and accurate. Before each new floor could be built, Mandelbaum needed to provide the Pinnacle Industries II team with reliable coordinates to set out the structure. On a smaller building, surveyors would use optical instruments to do this from the ground, but above a certain height that becomes impossible. “Because it’s so high, we cannot use conventional transits [transit levels] to establish location,” explains Mandelbaum. “On a bad weather day, that’s just not happening. At 1500 feet (over 450 metres), you cannot see with a traditional instrument.” So, for the first time on a residential construction site, Mandelbaum used a GPS-based solution.


Establishing control lines for each floor

Leica Geosystems基于GNSS的监视系统由GNSS接收器放置在建筑物外部 - 液压攀爬的保护屏幕包裹在这种情况下 - 在这种情况下 - 并充当随着地板的完成时向上移动的控制点。中央公园塔建筑上使用的系统包括四个Leica AS10 SmartTrack antennas与共同认同的360棱镜,一个Leica GM30 GNSS监视接收器,Leica Viva TS15 Total Station(前身Leica TS16) andLeica SpiderLeica GeoMoS monitoring software。曼德鲍姆(Mandelbaum)解释说:“保护屏幕爬上了建筑物,因此我将所有设备都放在上面。我不必担心我会身体上移动它,因为它已固定在屏幕的内部。GNSS天线,我将在建筑物的每个角落都放在彼此之间。他们会给我坐标,并使用我能够建立控制线。”控制线标记了建筑板边缘,柱子和墙壁的位置和定位。


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在高压环境中经过证实的准确性

Mandelbaum说,该系统对Pinnacle II团队的最大好处是它的准确性,在任何建筑工地工作时都令人放心,尤其是高层。他使用传统技术检查GNSS测量值。“为了验证访问线或控制线从地板到地板的堆叠,每10层,我将使用一条旧学校钢琴线。从字面上看,一条钢琴线,将其掉到角落。我会将良好的80磅重的重量绑在底部,然后我会用规则对地板上的访问线进行物理检查,并与控制线一起检查。它在那里,16Th一英寸(1/6英寸= 1.55毫米精度)。它只是证明这是对的。”

A Leica Viva TS15 Total Station was also used to establish the position of the control lines, acting as another independent check of the solution which could be referenced against the antenna readings. The total station positioned itself via prisms co-located under the GNSS antennas. Mandelbaum explains, “I would know where each antenna is according to the solution on the laptop. I would take the antenna that’s the farthest away from me, and I would look for the time solution as well. I would be at the same time slot and shoot (measure with the total station) the antenna. And if it’s the same number that I see on the laptop, within a few thousandths, then I will use it.”


Easy to use software displaying real-time data

Despite being new to the GNSS system, Mandelbaum and his partner found it easy to use. With support from Leica and by filming some of the processes on his phone for reference, he says “it was pretty simple.” A self-confessed mechanic rather than a ‘software guy’ Leica’s software programs − the Leica Spider Software Suite and Leica GeoMoS Now! − provided easy access to the real-time data essential for establishing control lines. “There were a few steps I needed to learn, and that was that. It was a piece of cake.”

中央公园塔的建设将于2021年完成。既然曼德尔鲍姆(Mandelbaum)在构建中的一部分已经完成,他计划再次使用Leica Geosystems GNSS系统:“如果可以的话,我会的。它有一个可行的记录。”


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