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Views: 12 Author: Site Editor Publish Time: 2026-08-28 Origin: Site
This case came from a repeat customer in Africa who was adding new components for an event structure based mainly on Ringlock scaffolding.
For the roof structure, the customer's original idea was straightforward: continue using the type of ladder truss already familiar to them.
The reference system used steel ladder truss sections in 3 m and 6 m lengths, with adjoining sections connected through an internal tube and bolts.
The basic structural concept was not the problem.
The practical problem was the material.
As the ladder truss became longer, the steel sections became increasingly difficult to carry, lift, position and connect during event installation. A 3 m section was already relatively heavy for repeated handling; a 6 m section made the problem more obvious, particularly when components needed to be assembled above ground level.
So the question was not:
How can we design a completely different roof beam?
It was:
Can we keep the customer's familiar ladder truss concept while making the individual sections easier to handle?
The customer initially wanted 3 m and 6 m Layher-style ladder truss sections for the roof.
This made sense from the customer's point of view. The ladder truss geometry and connection method were already familiar, and the roof was intended to work with a Ringlock-based event structure.
There was therefore no strong reason to change the whole structural concept simply for the sake of creating something new.
The problem appeared when we considered how the sections would actually be handled during repeated event assembly.
A long steel ladder truss is not only something that has to be transported. It also has to be unloaded, moved around the site, lifted into position and connected to the next section.
For temporary event structures, those practical operations matter.
Our factory already manufactures aluminum stage and truss components, including aluminum ladder truss with different connection methods.
Our standard solutions could have taken the project in another direction.
For example, we already produce ladder truss using spigot connections and bolted connections.
But simply replacing the customer's existing concept with our standard aluminum truss connection was not necessarily the best answer.
The customer wanted to retain one important feature of the original system:
the internal inserted-tube connection between two ladder truss sections.
That became the key modification.
Instead of redesigning the ladder truss around our normal connector, we kept the connection principle familiar to the customer and changed the main truss material from steel to aluminum alloy.
In other words:
Original concept:
Steel ladder truss + internal inserted connector
Our standard aluminum options:
Aluminum ladder truss + spigot connector / standard bolted connection
Final customer-specific solution:
Aluminum ladder truss + internal steel inserted tube + bolts
The final solution was therefore not a completely new truss system.
It was an adaptation of an existing idea.
Changing from steel to aluminum already addressed much of the handling issue, but there was another practical decision: we did not need to make the individual ladder truss section 6 m long.
The selected module length was up to 3 m.
When a 6 m run is required, two 3 m sections can be joined using the internal connector.
This decision was influenced by more than assembly.
Long components also create practical problems in:
transportation;
container loading;
storage;
site handling;
moving components between events.
A 6 m one-piece member may remove one connection, but it also becomes a much less convenient object to transport and store.
For this customer, retaining a 3 m modular section while allowing two sections to form a longer run was the more practical approach.
This is also consistent with the broader logic behind modular temporary stage, truss and scaffold systems: the useful question is not always how large a single component can be, but how standard modules can be combined into the required structure.
The customer's reference connection used an internal steel tube.
They wanted to preserve this principle.
Therefore, the customized aluminum ladder truss uses:
6061 aluminum alloy ladder truss
internal steel connecting tubes
bolts for securing the connection
The steel connector slides inside the aluminum main chord. Once the two ladder truss sections are brought together, the inserted connector bridges the joint and the bolts secure the assembly.
This differs from the aluminum truss systems we normally manufacture with conventional spigot or other standard truss connection arrangements.
That difference is important.
We were not trying to convince the customer that our normal connector was automatically better.
The customer's existing connection concept was part of the requirement, so we adapted the aluminum fabrication around it.
The aluminum ladder truss was specified with:
Main chord: 50 × 3 mm
Overall width: approximately 500 mm
Maximum individual section length: 3 m
Main material: 6061 aluminum alloy
Connector: internal steel tube with bolts
The 500 mm width was not selected randomly.
It relates to the Ringlock structure the customer intends to use.
The Ringlock bay/interface in this application is based around a 500 mm spacing, so keeping the ladder truss at approximately the same width creates a useful possibility for future integration.
If the customer later wants the ladder truss to connect directly with the Ringlock structure, a suitable pin-lock interface could be added at the ends of the ladder truss main chords.
That interface was not the main modification in this order, so it should be treated as a future connection option, not as part of the confirmed current configuration.
This case is easier to understand if we separate the original idea from the modification.
Element | Decision |
|---|---|
Ladder truss structural concept | Kept |
Approx. 500 mm width | Kept/adapted for the Ringlock geometry |
Internal inserted connector principle | Kept |
Bolt-secured connection | Kept |
Main truss material | Changed from steel to 6061 aluminum alloy |
Individual section length | Limited to 3 m |
6 m configuration | Formed by connecting two 3 m sections |
Standard aluminum spigot connection | Not selected for this customer |
Future Ringlock pin interface | Possible modification if required |
This table explains the project better than simply calling the result a "custom aluminum ladder truss."
The customization was quite specific:
Keep the geometry and connection logic that the customer wanted; change the parts that created the practical handling problem.
There is sometimes a tendency in custom fabrication to assume that a new material should also mean a new connection system.
This project went in the opposite direction.
We already knew how to manufacture aluminum ladder truss. We already had our own connection solutions.
But the customer did not come to us because the original ladder truss concept had failed as a concept.
Their practical concern was the heavy steel member.
So there was little value in changing everything.
The final solution changed the material and modular length, while retaining the customer's preferred insert-and-bolt connection principle.
That is a small design decision, but it is the main lesson of this case.
For a longer roof member, the assembly logic is simple:
3 m aluminum ladder truss
↓
internal steel connecting tube inserted into the main chord
↓
second 3 m aluminum ladder truss positioned onto the connector
↓
connection secured with bolts
↓
combined longer ladder truss run
This allows the customer to transport and store shorter sections while still assembling a longer member when the roof configuration requires it.
There is an important boundary in this case.
The decision to use shorter aluminum sections was based on manufacturing, transportation and practical handling considerations, together with our experience producing aluminum event structures.
This case does not provide a calculated roof load, verified span capacity, wind rating or complete structural verification for a particular event roof.
Changing the material from steel to aluminum does not by itself prove that the resulting component has the same structural capacity as the original steel member.
For an actual roof structure, the final configuration should be verified according to the ladder truss geometry, connections, span, support arrangement, roof system, actual loads, site conditions and applicable project requirements.
That distinction is particularly important because this component is intended for an overhead roof structure.
The useful lesson from this project is not simply that aluminum is lighter than steel.
The more interesting point is that customization does not always mean redesigning everything.
In this case, three decisions were separated:
What was already useful?
The ladder truss concept and inserted connection method.
What was creating the practical problem?
The weight and handling of long steel sections.
What actually needed to change?
The main material and the way the total length was divided into transportable modules.
The result preserved something the customer already understood while adapting the component to the way temporary event structures are transported, stored and repeatedly assembled.
Sometimes that is a more practical approach than replacing a familiar system with a completely different one.
If you already use Ringlock scaffolding and need ladder truss or aluminum structural components for a temporary event roof, the most useful information to send us is:
required roof length and width;
required ladder truss span and section length;
Ringlock bay dimensions;
photos or drawings of your existing Ringlock system;
existing connection details;
whether existing steel or aluminum components need to be reused;
intended roof covering and equipment arrangement;
indoor or outdoor application;
any reference drawing showing the connection you want to retain.
With that information, we can first determine whether a standard component can be used or whether the connection interface, rather than the whole structure, needs to be customized.
That was technically a possible manufacturing direction, and we already produce aluminum ladder truss using our own connection methods. However, this customer specifically wanted to retain the inserted-tube-and-bolt connection principle of the system they were familiar with. The customization therefore focused on changing the material while preserving that connection logic.
A 6 m one-piece member is longer to transport, store and handle. Two 3 m modules allow the customer to create the longer run through the internal connection while keeping the individual pieces more manageable.
The approximately 500 mm ladder truss width was selected with the customer's Ringlock geometry in mind. If direct integration is required, a suitable pin-lock interface could be developed at the ends of the ladder truss. The exact connection should be confirmed according to the customer's existing Ringlock components and required configuration.
No. Material substitution alone does not establish equivalent structural capacity. The actual capacity depends on the complete geometry, member dimensions, bracing, connections, span, support conditions and loads. Project-specific structural verification is required where applicable.
