Faqs

Frequently Asked Questions

Frequently Asked Questions

Which are the sizes of BUILDAIR structures?

BUILDAIR structures and hangars can be designed within a wide range of dimensions, in order to comply with any specific requirement:

  • Clear width: from 10 meters (33 feet) up to 75 meters (246 feet)
  • Clear height: typically, half of the clear width, i.e., up to 37.5 m (123 ft)
  • Length: There is no limit, any length can be achieved

Our inflatable structures are designed to slightly swing in cases of very strong winds, in order to increase their structural resistance. The maximum deformation is around 2.5 meters for the very big structures and hangars. Even in that case, we consider important security margins, so our structures will never contact any of the elements covered by them.

How long are the typical set-up times of BUILDAIR structures?

The set-up process takes up from few hours, for the small structures and hangars, to a few weeks, for the very big ones. These extremely fast set-up times enable great agility in deployment / removal.

 

The logistics and transportation are simple and easy: BUILDAIR structures and hangars can be packaged and transported within standard containers (sea containers of 20 or 40 feet), or air transport pallets.

How are BUILDAIR structures designed, which are their elements?

BUILDAIR structures are formed by low-pressure tubes (around 20 mbar over atmosphere pressure) aligned parallel to each other, forming a “rib-cage” structure. Structural stability is guaranteed both lengthwise by the support of the lateral air tubes, and crosswise through the internal pressure in the tubes.

 

An external flat slim webbing system keeps the tubes together and transmits wind forces to the ground. As the structures have no metallic parts, no corrosion issues can appear.

Which is the operational lifespan of BUILDAIR structures?

BUILDAIR structures and hangars can be used from mid-term periods (several months) to long-term periods (several years), depending on every customer specific requirements.

 

Lifespan depends basically on maintenance, environmental and operating conditions. BUILDAIR offers sucessive packages of 3-years Maintenance. The first 3-year Maintenance Package shall cover any defect or repair during first 3 years of operation. After such period, another 3-year Maintenance Package can be agreed between the Parties, after a complete analysis of the hangar by BUILDAIR, and after defining maintenance actions to be performed from that moment to the extended lifespan horizon.

What happens if there is any kind of contact between the hangar tubes and the (aircrafts, vehicles, installations, etc.) during the structure? Can the inflatable structure or the internal elements be damaged?

There is an important feature of BUILDAIR structures to be noted: even with 2 or 3 damaged and inoperative alternate tubes (due to accidents or sabotages), the adjacent tubes would support the extra load, ensuring structure stability. Consequently, the structural stability would remain guaranteed, and the repair of the damaged tube/s would not be urgent (could be performed during next suitable occasion).

Required personnel for set-up of BUILDAIR structures

Depending on the hangar size, from 4 to 10 workers (non-qualified personnel) are required for the set-up process. During the 1st set-up of the hangar, 2-3 members of BUILDAIR technical team would coordinate such team of 4-10 workers. Simultaneously, BUILDAIR technical team would train the client staff, for sucessive set-ups and dismantlings.

How resistant are BUILDAIR structures to environmental: wind, rain and snow?

BUILDAIR structures are completely waterproof, and can be designed to resist a wide range of wind and snow loads. Depending on the hangar size, up to wind design speeds of 150 km/h or more, and snow design loads of 100 kg/m2 (if higher snow design loads are required, additional snow melting systems can be installed also by BUILDAIR).

 

Furthermore, BUILDAIR structural calculations and designs are developed using significant security factors, which guarantee the use of the hangar within the wind and snow design specifications.

Is it possible an over inflation of the structural tubes?

BUILDAIR structures design does not allow over inflation of the structure. The maximum overpressure that blowers could provide is around 40 mbar, but it is limited to around 30 mbar, by means of frecuency converters. During the testing phase, previous to manufacturing, some 1:1 scale models are tested until explotion (close to 60 mbar). These quality tests are always performed for each of our structures.


How are the doors and enclosures of BUILDAIR structures?

Depending on their use, BUILDAIR structures and hangars can be opened or closed in both sides. E.g., for jacking aircrafts, it’s mandatory to close both ends, in order to avoid windstreams throught the hangar, that could put in risk aircraft stability. The enclosures can be of different tipologies, depending on the hangar size.

 

During the engineering phase of each project, BUILDAIR analyzes which is the most suitable typology of both front and rear enclosures: polygonal aluminum structure, textile membrane tightened with metallic masts, inflated tubes over a movable metallic base, etc.

As an example, for big hangars (over 35 meters or 115 feet clear width):

  • Rear enclosure:
    • Consists in an inflatable wall made up of some vertical tubes and a fabric layer with circular sector shape at the top
    • Inflatable tubes maintain stability with the aid of metal masts, which would be fixed to the concrete through anchor plates and steel cables.
    • The circular sector layer closes the space not covered by the vertical inflatable tubes, preventing the entry of air inside the hangar, and isolating the hangar from external weather conditions. The entries of employees and vehicles are in the lower lateral part of this layer, and can be made in different sizes.
  • Front doors:
    • The 2 front doors are made up of metal platforms, each supporting several inflated tubes. Platforms are joined on site, to form a single platform.
    • To ensure the stability of each platform, some hydraulic jacks placed on extendable legs raise the platforms automatically.
    • To minimize warpage of the tubes against wind forces, steel cables connect the inflatable tubes from a certain height to the concrete floor.

Our inflatable structures are designed to slightly swing in cases of very strong winds, in order to increase their structural resistance. The maximum deformation is around 2.5 meters for the very big structures and hangars. Even in that case, we consider important security margins, so our structures will never contact any of the elements covered by them.

Can you please describe the design and mode of operation of the doors?
  • A system of fixed and swing fabric layers cover half of the total area. This area does not need to remain opened.
  • The swing fabric layers can be manually opened, keeping structural stability of the hangar.
  • The rest of the area is covered by means of 2 movable doors, as described above.

 

Regarding door operation process, each platform has a system of automatic scrolling. Each platform is moved to its opening or closing position. To accomplish this task of opening and closing the door, the hydraulic jacks are gathered up automatically, and the tubes are partially deflated to secure the stability of the platform in the displacement process.

 

Can water or ice be accumulated inside? Do they need to be drained off?

No need to drain, as no water or ice can be accumulated in the tubes.

In the event of wind speeds over the design wind speeds, does the structure need to be deflated, or are there other recommended handling procedures?

If a very strong continuous wind (higher than design wind speed) is forecasted, it’s recommended to deflate the structure before such very strong continuous wind reaches the hangar location.