science

Tower crane anti-collision system

Tower crane anti-collision system is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tower crane anti-collision system rather than just read about it. In short: A tower crane anti-collision system is an operator support system for tower cranes on construction sites. It helps an operator to anticipate the risk of contact between the moving parts of a tower crane and other tower cranes and structures.

Key takeaways

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Reference excerpt

A tower crane anti-collision system is an operator support system for tower cranes on construction sites. It helps an operator to anticipate the risk of contact between the moving parts of a tower crane and other tower cranes and structures. In the event that a collision becomes imminent, the system can send a command to the crane's control system, ordering it to slow down or stop. An anti-collision system can describe an isolated system installed on an individual tower crane. It can also describe a site wide coordinated system, installed on many tower cranes in close proximity.

History Developments in tower crane design and the increasing complexity of construction sites in the 1970’s and 1980’s led to an increase in the quantity and proximity of tower cranes on construction sites. This increased the risk of collisions between cranes, particularly when their operating areas overlapped. The first tower crane anti-collision systems were developed in France in 1985 by SMIE. A Ministry of Labour directive issued in 1987 made anti-collision systems compulsory on all tower cranes in France. In 2011, Hong Kong introduced a "Code of Practice for the Safe Use of Tower Cranes" and Singapore introduced a "Workplace Safety and Health construction Regulation". Both required the provision of an anti-collision system where more than one tower crane is in use. In 2015, Luxembourg required automatic devices to be installed to avoid the risk of collision between tower cranes.

Collision avoidance with structures and other tower cranes Various sensors are used to measure the position, velocity and angle of each tower crane’s moving parts. These sensors can be part of the anti-collision system or the crane. This information is sent via radio link to a computer and a display in the operator’s cabin. Several features commonly found across tower crane anti-collision systems use this data.

Zoning Anti-collision systems allow prohibited zones to be defined. These are areas (such as schools, transport links, electrical power lines and areas beyond the site boundary) where the crane is not allowed to operate.

Situational awareness The operator's cabin hosts a display showing the tower crane's position, movement and operating area. Where the tower crane’s operating area overlaps with other cranes or prohibited zones these are also displayed. The system alerts the operator when the crane is approaching a prohibited area or another crane.

Tower crane control Anti-collision systems are often connected to the tower crane’s control system. This allows the anti-collision system to automatically slow down and stop the crane if there is a risk of an accident. The operator is then prevented from moving the crane towards the danger and can only move it away.

Supervisory system A supervisory system is a typical feature of an anti-collision system that covers an entire construction site. It allows a site supervisor to have a complete view of tower crane operations on a construction site. It also allows for centralised configuration and maintenance of the system.

Fail-safe operation

If a fault occurs on a tower crane's anti-collision system, or it is bypassed, other tower cranes will be prevented from operating within the volume of the faulty system.

Collision avoidance with other vehicles Anti-collision lights are required on tower cranes operating in or near to airfield flight paths. Three red flashing lights are positioned on each end and the top of the crane. They provide a visual warning to aircraft pilots.

Limitations Tower crane anti-collision systems do not prevent collisions with mobile construction equipment such as mobile cranes and aerial work platforms.

Standards A draft standard setting out the functional requirements of tower crane anti-collision devices and systems is open for comment. It is BS EN 17076. Anti-collision devices and systems for tower crane. Safety characteristics and requirements.

See also Crane (machine) - Tower crane Anti-collision light

References

Worked examples

Example 1 — a first encounter with Tower crane anti-collision system

Start with the simplest possible case. Write down what Tower crane anti-collision system claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tower crane anti-collision system before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tower crane anti-collision system ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tower crane anti-collision system

In research: Tower crane anti-collision system appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tower crane anti-collision system in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tower crane anti-collision system is common in secondary-school and first-year university syllabi. It links to neighbouring topics Construction, Cranes (machines), so understanding it makes those chapters shorter.
In everyday life: Look for Tower crane anti-collision system outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tower crane anti-collision system in 20 minutes

Read the reference excerpt below once, without taking notes.
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Frequently asked questions

What is Tower crane anti-collision system in simple terms?

Why does Tower crane anti-collision system matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tower crane anti-collision system?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tower crane anti-collision system.