Tower crane
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Lifting tons of steel dozens of meters into the air requires surgical precision. On a construction site, the tower crane sets the pace. Like a conductor, this machine, designed for heavy lifting, has become an indispensable ally for construction professionals. Ultimately, the speed of your work will largely depend on its size. To help you make the right choice, this guide examines the mechanical characteristics and financial implications of these immense structures.
How does a tower crane work?
The main structure and the lifting
Everything hinges on the mast. It's the true backbone of the installation, the part that allows it to tower above the building under construction. At the very top is the slewing mechanism, an essential component for rotating the upper section 360 degrees. At the front, the boom extends to cover the entire work area. The longer the boom, the wider the site coverage. During assembly, all these elements simply snap together using pins or bolts.
Load management and balance
To prevent the entire structure from tipping under the weight of the loads, the section opposite the work area is fitted with a heavy concrete or steel counterweight. This ensures the crane's stability. The trolley travels along the boom, depositing materials with millimeter precision as close as possible to the work crews. In the cab, the crane operator constantly monitors the load chart. This crucial table indicates the maximum lifting capacity based on the trolley's position—a golden rule for ensuring everyone's safety.
Types of tower cranes
GME and quick-mount models
On large-scale construction sites, modular cranes are the most common. Their main advantage lies in their ability to extend as the building grows, thanks to an ingenious telescoping system. Flat-top models, which have no tie rods on the boom, are also available. This very practical design reduces overhead clearance, making it ideal when several cranes need to pass each other in a confined space. In very dense environments, the luffing boom version allows for easy maneuvering around neighboring buildings. And for shorter projects, self-erecting cranes remain unbeatable, as they can be set up independently in just a few hours.
Fixed or mobile tower crane?
As a general rule, a fixed tower crane is anchored to the ground, either on a cross-shaped base or a concrete foundation. It works wonders on long-term construction sites that require lifting very heavy loads. However, if you plan to move the machine regularly without having to dismantle it, you will need to choose a different approach. Feel free to compare these traditional installations with an SNM Tower mobile tower crane to find the ideal compromise.
Technical specifications and capabilities
Understanding performance indicators
Reading the technical specifications of a tower crane requires a clear understanding of a key concept: the load moment. In practical terms, this is the ratio between the weight of the load and its distance from the central mast. The load chart then translates all of this visually to ensure that the structure is never compromised.
Table of standard characteristics
Since every construction site is unique, here's a brief overview of standard sizes. This will help you better plan your future installation:
| Technical criteria | Description | Indicative value |
|---|---|---|
| Height under hook | Distance between the ground and the lifting point | 20 to 80 meters |
| Scope | Effective length of the arrow | 30 to 80 meters |
| Maximum load | Maximum permissible weight closest to the mast | 4 to 40 tonnes |
| Load at the end of the boom | Lifting capacity at the end of the reach | 1 to 5 tonnes |
Price of a tower crane
Criteria that influence investment
Unsurprisingly, the price of a tower crane depends on many factors. The base price will logically increase with lifting capacity, boom length, and any onboard driver assistance systems. But the real difference lies in the acquisition method. Buying new is expensive and only justified if you plan to operate the machine continuously for years. To preserve your cash flow, leasing or the used market are excellent alternatives. Also, remember to set aside money for additional costs, such as assembly, dismantling, and especially transport by special convoy.
Indicative price ranges
To give you a rough idea, expect to pay around €40,000 for a used self-erecting crane. At the other extreme, a brand-new GME model designed for large-scale infrastructure can easily exceed €400,000. Rental prices typically range from €3,000 to €10,000 per month, depending on the crane's size. Of course, only a personalized assessment will provide you with a precise quote.
SNM Cranes, your tower crane expert
Tailored technical support
At SNM Cranes, we don't just supply you with a machine. Our team takes the time to study your site, the soil type, and the loads you'll be handling. This thorough approach allows us to recommend the right equipment, the one that will guarantee the absolute safety of your teams.
The alliance with leading manufacturers
We have chosen to distribute equipment renowned for its reliability. Opting for a Terex tower crane, for example, guarantees optimal productivity even in the face of the worst weather conditions. Behind the scenes, our technicians take care of everything, from mechanical monitoring and preventive maintenance to spare parts management. Our goal is simple: to avoid any downtime on your construction site.
Need to secure your operations with equipment tailored to your specific requirements? Contact our technicians directly. They will be happy to provide a quote for the installation and commissioning of your future crane.
If your construction site requires mobility and assembly without an assistance crane, you should opt for a mobile tower crane .