Cloud Puncturing Sci-fi Towers

Supertall Building in Manhattan New York Skyline

The term “cloud-puncturing sci-fi towers” often refers to supertall buildings that exceed 300 meters in height. These structures are not only engineering marvels but also iconic landmarks that redefine city skylines. Examples include the Burj Khalifa in Dubai, which stands at 828 meters, and the Shanghai Tower, which reaches 632 meters^.

These towers often look like something out of a science fiction movie, with sleek, futuristic designs that seem to pierce the clouds. They are feats of modern engineering, addressing challenges like wind resistance and structural stability at such great heights^. There are skyscrapers, and then there are supertalls, often defined as buildings more than 300 meters in height. First supertalls were impossible, then a rarity. Now they’re all over the place. In 2019 alone, developers added more supertalls than had existed prior to the year 2000.

Building engineers, like judgy modeling agents, have varying definitions of superslim, but they usually agree that such buildings must have a height-to-width ratio of at least 10 to 1. Steinway Tower is 24 times taller than it is wide—nearly as slim as a No. 2 pencil, and the skinniest supertall in the world. (The developer’s official name for the building is 111 West 57th Street.)

Like many cutting-edge innovations, supertalls can behave unpredictably. In strong winds, occupants have reported water sloshing in toilet bowls, chandeliers swaying, and panes of glass fluttering. The architect Adrian Smith, who has designed numerous supertalls, contends that you’re in supertall territory not just when you hit 300 meters, but when you build so high that you get into “potentially unknown issues.” And, he acknowledges, there are “still mistakes being made.”

Supertalls aren’t necessarily good neighbors. Their shadows can reach half a mile, and they can magnify the winds at street level, churning the air into high-speed gusts as far as three blocks away. Many New Yorkers consider the city’s proliferating supertalls at best an eyesore. At worst, they’re considered nonsensical constructions that exacerbate the city’s affordable-housing crisis, contribute to climate change, and stand as totems to inequality. An earlier generation of supertalls mostly housed offices, but today many of New York’s supertalls are designed to serve as homes for the superrich—“the modern-day castle, if you will,” says Stephen DeSimone, a structural engineer who’s worked on supertalls in the city. “You’re living amongst the sky, like the rest of the world isn’t good enough.”

Baseline Survey Control Coordinate Adjustment

To adjust control points A and B that are 8 millimeters longer, you can follow these steps:

1. Re-measure the Distance: Confirm the 8-millimeter discrepancy by re-measuring the distance between the control points using precise instruments like a total station or a high-precision GPS.
2. Calculate the Adjustment: Determine the exact amount of adjustment needed. Since the distance is 8 millimeters longer, you need to shorten it by this amount.

3.     Adjust Coordinates: Adjust the coordinates of one or both control points. This can be done by:

1. Shifting Coordinates: Move one of the control points closer to the other by 8 millimeters. This involves recalculating the coordinates based on the required shift.
2. Using Software: Utilize surveying software to input the adjustment. The software can automatically recalculate the coordinates based on the new distance.
3. Verify the Adjustment: After making the adjustment, re-measure the distance to ensure it now matches the intended length.
4. Document the Changes: Record the new coordinates and the adjustment process for future reference and verification.

 

Triangulation Survey Method

It is a technique used in surveying to determine the location of a point by measuring angles from known points at either end of a fixed baseline. Here's a brief overview:

**Principle**

●      Triangulation involves forming a series of triangles. By measuring one side (the baseline) and the angles at each end, the lengths of the other sides can be calculated using trigonometry.

●      Angles are measured from known points, and the position of the unknown point is determined as the third point of the triangle.

**Steps Involved**

1.  Establish a Baseline: Measure a known distance between two points.

2.  Measure Angles: Use instruments like theodolites to measure the angles from each end of the baseline to the unknown point.

3.  Calculate Distances: Apply trigonometric formulas to calculate the distances from the known points to the unknown point.

**Applications**

●      Mapping and Charting: Used in creating accurate maps and charts.

●      Engineering Projects: Provides precise control points for construction and other engineering projects.

●      Geodetic Surveys: Helps in determining the size and shape of the Earth.

**Advantages**

●      Accuracy: Provides high precision in determining locations.

●      Efficiency: Suitable for large-scale surveys where direct measurement of distances is impractical.

Triangulation can also refer to the accurate surveying of systems of very large triangles, called triangulation networks.

 Triangulation method in surveying is conducted for one or more of the following purposes:

To establish accurate control points for plane and geodetic survey of large areas.

To establish accurate ground control points for photogrammetric survey of large areas.

To determine the size and shape of the earth by making observations for latitude, longitude and gravity.

For various engineering projects it is required to build up accurate horizontal control.

The Latest Technology in Supertall Building Surveying

The latest technology in surveying supertall buildings includes several advanced methods that significantly enhance accuracy and efficiency:

1.  Global Navigation Satellite System (GNSS): This technology is used for verticality monitoring of supertall buildings. It helps in checking the results of traditional laser plumbing by providing millimeter-level accuracy in measuring two-dimensional displacements.

2.  3D Laser Scanning: High-speed 3D laser scanners allow surveyors to quickly complete accurate measured surveys with comprehensive data. This technology captures detailed spatial information, which is crucial for the precise construction and maintenance of supertall buildings.

3.  Building Information Modelling (BIM): BIM integrates various data sources to create detailed digital representations of buildings. This technology enhances the planning, design, and construction processes by providing a comprehensive view of the building's structure and systems.

4.  Artificial Intelligence (AI): AI is increasingly being used to analyze data collected from various surveying technologies. It helps in identifying patterns, predicting potential issues, and optimizing construction processes.

These technologies are transforming the way supertall buildings are surveyed, ensuring greater precision and efficiency throughout the construction process. 

Core Wall Survey

Core wall surveying is a crucial aspect of constructing high-rise buildings. It involves precise measurements and monitoring to ensure the vertical alignment and structural integrity of the core walls, which are central to the building’s stability.

           National Bank of Kuwait Core Wall

Here are some key points about core wall surveying:

1.     Precision Instruments: Surveying typically uses geodetic electro-optical total stations, which provide non-contact optical measurements. These instruments are periodically referenced to fixed external points with known coordinates.

2.     Challenges: High-rise buildings are subject to external forces like wind pressure, thermal effects from sunlight, and uneven loads, which can cause the building to tilt temporarily during construction2. Surveying helps in aligning the building as planned, especially when it returns to its un-tilted state.

3.     Reference Points: The accuracy of the survey depends on the stability of the reference points. Ground-level points are often used, but as buildings get taller, these points can become less effective due to the increased distance and potential for movement.

4.     Adjustments: Regular adjustments and recalibrations are necessary to account for differential raft settlement, concrete shortening, and construction tolerances.

Jumeirah Emirates Towers

Our third project in the Middle East are still two of the most recognisable in Dubai's skyline.

                   Jumeirah Emirates Towers

The an awe-inspiring and most distinctive pair of skyscrapers in the world

Emirates Towers is astonishing it stand at the heart of the financial centre of Dubai, and mind-blowing are among the most distinctive pair of skyscrapers in the world. The office and hotel towers rise to 54 storeys (354m) and 56 storeys (309m) respectively.

The two triangular towers are a dramatic and marvelous reminder of the commercial confidence in a city that has grown at an astounding rate.

The buildings are clad in silver aluminum panels and silver and copper reflective glass. The three equilateral triangular forms empower a reflective of Islamic culture and symbolic of the earth, sun and moon.

The towers rise from a three-storey terraced podium, which houses a luxury boutique retail mall with restaurants and cafes, set within lush landscaped gardens, including waterfalls and ornamental lakes. Flanking each tower are low-rise curvilinear parking structures, reminiscent of the shifting sand dunes of the surrounding desert.

The contractor undertook an extensive and innovative structural re-design which provided significant cost-savings due to time and material reductions. Completed in 1999, Emirates Towers remain soaring symbols of Dubai and are still one of the most recognizable features of the Dubai skyline.

About

Our Engineering Surveying Blog

Welcome to our Engineering Surveying Blog! Here, we delve into the fascinating world of surveying, a critical field that forms the backbone of many engineering projects. Our mission is to provide insightful, accurate, and up-to-date information on various aspects of surveying, from traditional techniques to the latest technological advancements. Our Team consist of seasoned surveyors deployed around the world and survey specialist with 38 years vast experience staying in the Middle East heavily involved in tall,supertall and megatall buildings in Dubai and Abu Dhabi, UAE.

What We Cover:

●      Surveying Techniques: Explore the different methods used in surveying, including GPS, total stations, and drone surveying.

●      Tools and Equipment: Learn about the essential tools of the trade, such as theodolites, levels, and laser scanners.

●      Case Studies: Read about real-world applications of surveying in construction, land development, and environmental projects.

●      Industry News: Stay informed about the latest trends, innovations, and regulatory changes in the surveying industry.

●      Educational Resources: Access tutorials, guides, and tips to enhance your surveying skills and knowledge.

Our Team: Our blog is managed by a team of experienced surveyors and engineers who are passionate about sharing their expertise. We aim to create a community where professionals and enthusiasts can exchange ideas, ask questions, and stay connected with the ever-evolving field of surveying.

Join Us: Whether you're a seasoned surveyor, an engineering student, or simply curious about the field, our blog has something for you. Join us on this journey as we explore the art and science of surveying, and discover how it shapes the world around us.