Project Background

This inquiry involved a customer planning a relatively large LED screen supported by an aluminum ground-support truss system.

During the discussion, the customer had already indicated that the LED screen would be approximately 13 m wide, while the final screen height was still being confirmed.

A much smaller reference system—around 5 m wide × 4 m high—was clearly not large enough for this application.

So the structure needed to be upgraded.

The obvious response would have been:

Use a much larger truss beam.

But before increasing the entire truss specification, we considered another question:

Does the customer really need to buy a substantially larger beam only because of one large LED span?

That led us back to a structural idea we had used in another quotation:

add an intermediate support near the middle of the long horizontal beam.

The difference this time was that the customer was not trying to solve a budget emergency by reusing another tower.

The purpose was simpler:

avoid oversizing the entire truss system when an additional support point may solve the actual structural problem more efficiently.

The Original Concern: A Long LED Beam

The customer's LED screen was much larger than the small reference structure we had shown.

At approximately 13 m wide, the upper horizontal truss would need to span a much longer distance.

For a ground-support system, increasing screen size does not only increase the visible width.

It also changes questions such as:

• horizontal span;

• support spacing;

• truss size;

• connection arrangement;

• screen load distribution;

• lifting arrangement.

One possible reaction is simply to move from a normal truss beam to a much larger section.

That may be appropriate in some projects.

But larger truss also means:

• more material;

• higher cost;

• more transport volume;

• heavier components;

• a larger system even when the customer may not need that capacity elsewhere.

So we looked at the support arrangement before automatically increasing the beam size.

For readers looking at conventional aluminum LED support systems, DragonTruss groups these under Typical LED Ground Support Truss. The broader truss range is available under Aluminum Truss.

Our Judgment: Change the Support Condition Before Changing the Whole Beam

Instead of asking:

How much larger should the beam become?

we asked:

Can we reduce the unsupported length by adding another vertical support?

The concept is straightforward.

A conventional arrangement may look like:

left tower — long beam — right tower

The modified concept becomes:

left tower — beam — center support — beam — right tower

The purpose of the added center support is to create another load-transfer point so that the long horizontal run is no longer treated only as one uninterrupted support condition.

This does not mean that adding one column automatically gives a known load-capacity increase.

The exact allowable load still depends on:

• truss type;

• span;

• connector arrangement;

• load position;

• LED hanging points;

• support geometry;

• complete ground-support system.

But as a structural concept, the additional support can significantly change how the long beam is supported.

That was the direction we wanted to evaluate before simply upsizing the entire truss system.

The Practical Problem: Where Do You Put the Center Column?

This was the customer's concern.

If the main horizontal beam already occupies the central line of the LED structure, placing another vertical tower directly between the beam lines may interfere with the existing truss arrangement.

Our answer was:

The center pillar does not have to sit between the beam trusses. It can be positioned behind the main horizontal beam.

This is an important detail.

The new vertical support can stand slightly behind the beam line, while a short horizontal connection transfers the support into the existing beam.

So the system can retain the main LED beam layout without forcing the center tower directly into the screen plane.

Suggested caption: The additional vertical support can be located behind the main LED beam rather than directly between the horizontal trusses.

The Key Question Became: How Do We Connect the Rear Column to the Existing Beam?

Once the center support is placed behind the main beam, the next question is no longer:

Where should the tower go?

It becomes:

How do we connect that tower to the existing beam so it can participate in the support system?

For the truss systems we were discussing, the connection can be developed around the sleeve block.

There are two common sleeve-block styles relevant to this proposal.

And each leads to a slightly different connection method.

Connection Method 1 — Sleeve Block With Half Connectors on Four Sides

The first type of sleeve block uses half connectors on its four faces.

Suggested caption: Sleeve block with half-connector style connection points on four sides.

With this type of sleeve block, the rear center support can use a short truss section—approximately 250 mm in the proposed concept—to extend from the sleeve block toward the existing horizontal beam.

Suggested caption: A short truss section can be used as the interface between the rear sleeve block and the main horizontal beam.

At the beam end of this short truss section, we can add:

four half connectors + four single clamps

Suggested caption: Half connector combined with a single clamp for connecting the added support interface to the existing truss chord.

The connection logic becomes:

vertical center tower

↓

sleeve block

↓

short truss section

↓

four half connectors + clamps

↓

existing horizontal LED beam

This allows the center tower to remain behind the main beam while still creating a physical connection into the existing horizontal truss.

Why the Short Truss Section Is Needed in This Version

With the four-side half-connector sleeve block, the sleeve block itself connects naturally to a truss section.

But because the main beam is positioned in front of the rear center tower, we still need to bridge the distance between:

• the sleeve block;

• the main horizontal beam.

The approximately 250 mm truss section provides that offset.

It acts as the short interface member between the rear support tower and the beam.

The exact length would depend on the final relative positions of:

• center tower;

• sleeve block;

• main beam;

• LED screen.

So 250 mm should be understood as the approximate proposal concept, not a universal dimension.

Connection Method 2 — Sleeve Block With Sleeve-Type Openings

The second sleeve-block style is different.

Instead of four conventional half-connector faces, the sleeve block uses a more open sleeve-type / tube-receiving configuration.

Suggested caption: Sleeve block with sleeve-type connection arrangement.

With this design, we may not need the additional short truss section.

Instead, the connection can be made more directly by adding:

four half connectors + single clamps

to the sleeve-block interface.

Those clamps then connect directly onto the chords of the existing horizontal beam.

The concept becomes:

vertical center tower

↓

sleeve block

↓

four half connectors + clamps

↓

existing horizontal beam

This produces a shorter connection path than Method 1.

Why the Half Connector + Clamp Matters

The small component in this proposal is easy to underestimate.

The half connector with clamp is what allows a component originally designed around one truss connection direction to connect onto the chord of an already existing horizontal truss.

Instead of requiring the existing beam to have a specially manufactured connector at exactly the center point, the clamp arrangement gives us another possible way to create the interface.

This is especially useful when:

• the main beam already exists;

• the beam should not be replaced;

• the center support is an added modification;

• the exact connection position needs some flexibility.

In practical quotation terms, this can turn a difficult “replace the beam” problem into a smaller “add an interface” problem.

Two Sleeve Blocks, Two Connection Paths

The two approaches can be summarized like this:

The structural idea is the same:

Place the new vertical tower behind the main LED beam and create a short connection from the sleeve block into the beam.

What changes is the interface detail.

Why We Preferred This Direction Before Simply Increasing the Truss Size

The customer had one main requirement:

support a larger LED screen.

There was no reason to assume that every component in the system had to become larger just because one span became demanding.

So our practical sequence was:

1. confirm the LED size;

2. evaluate the long horizontal span;

3. consider whether the existing beam family can remain;

4. add a center support;

5. place that support behind the beam to avoid interference;

6. create the support connection through the sleeve block and clamp system;

7. only move to a larger truss size if the final verified configuration still requires it.

This is a very different way of thinking from:

LED is bigger → buy bigger truss.

The point is not to avoid larger truss at all costs.

The point is to avoid unnecessary oversizing before the support arrangement itself has been optimized.

This Is Similar to a Previous Case—but the Reason Is Different

We had previously considered a center-support concept in another project.

In that case, the customer had a limited budget and wanted a very large LED arrangement.

The solution was to reposition an existing speaker tower behind the stage and use it as an additional center support.

The structural idea was similar:

reduce the long unsupported beam condition by creating an additional support point.

But the commercial reason was different.

Previous case

Constraint: customer could not afford another complete structural upgrade.

Decision: reuse an existing tower in another position.

This case

Constraint: customer may otherwise need to buy a larger truss system only to solve one LED span.

Decision: investigate a dedicated rear center support before increasing the entire beam specification.

This distinction matters because the same structural idea can solve different project problems.

The Final Proposal Is Still Being Developed

At this stage, this is still a quotation/proposal discussion.

The customer has confirmed that the LED screen will be approximately 13 m wide, but the final height is still being requested.

We have explained that the smaller reference ground-support structure is not suitable as-is and that the design needs to be upgraded.

Our current proposal direction is:

• keep an aluminum ground-support truss concept;

• evaluate an additional center vertical support;

• position that support behind the main beam;

• connect it through the sleeve-block interface;

• use either a short truss + clamp arrangement or a direct clamp arrangement depending on the sleeve-block type;

• verify the final structure after the complete LED size and load information is available.

There is no final engineering conclusion yet.

There is also no confirmed final BOQ yet.

This should therefore be understood as a proposal-stage structural modification case, not a completed installed project.

What This Modification Potentially Changes in the BOQ

If the center-support approach proves suitable after the final structural check, the BOQ change may be relatively focused.

Instead of replacing the whole upper beam with a much larger truss family, the additional components may center around:

• one additional vertical tower;

• one sleeve block;

• short interface truss where required;

• half connectors;

• single clamps;

• associated base/support components;

• any required lifting or connection hardware.

The exact quantities depend on the final truss system selected.

So we should not publish an exact BOQ before the customer's full LED dimensions and final structural configuration are confirmed.

The important BOQ logic is:

add a support module before automatically replacing the whole beam system.

Experience-Based Judgment vs. Engineering Verification

This case involves an overhead LED support structure, so the distinction between practical judgment and structural verification is important.

Confirmed Facts

The supplied discussion confirms:

• the LED screen is expected to be approximately 13 m wide;

• final LED height is still being requested;

• the smaller reference system is approximately 5 m wide × 4 m high and is not sufficient as-is;

• the structure therefore needs to be upgraded;

• we proposed positioning an additional vertical support behind the main beam;

• we proposed two sleeve-block connection approaches;

• one method uses a short truss section;

• both methods can use half connectors + single clamps to connect to the existing beam.

Experience-Based Judgment

Based on our quotation and truss-system experience:

• changing the support arrangement may be more economical than immediately increasing the entire beam size;

• a rear center support can avoid occupying the LED screen plane;

• sleeve blocks, short truss sections and clamp interfaces provide practical ways to develop this connection.

These are structural proposal judgments.

What Still Requires Verification

The supplied information does not yet establish:

• actual LED total weight;

• LED hanging-point loads;

• allowable beam load;

• load sharing between supports;

• exact center-support reaction;

• clamp capacity in this specific configuration;

• sleeve-block capacity;

• tower/base requirements;

• ballast requirements;

• wind loading;

• safety factor;

• engineering approval.

Therefore, this Case Study should not say that adding the center tower “increases the beam capacity to X kg.”

The correct statement is:

the additional support changes the support condition and is intended to share the structural demand, but the final allowable capacity must be verified for the complete configuration.

That distinction follows the DragonStructure evidence rule: practical structural reasoning must not be rewritten as verified engineering calculation.

What This Case Shows

The obvious lesson is:

Add a middle column to a long LED truss.

But the more useful lesson is slightly different:

Before increasing the size of every component, first ask whether the support arrangement itself can be improved.

The customer does not benefit from buying larger truss simply because it is larger.

The better question is:

What does the structure actually need in order to solve this particular span?

In this case, that led us to consider:

larger beam

versus

same structural family + additional center support + customized interface.

And once the customer asked:

“But where can the center pillar go?”

the next layer of the Case Study appeared:

It does not necessarily need to go between the beam trusses. It can stand behind the beam and connect back into it.

That is the real practical value of this project.

FAQ

Why not simply use a larger aluminum truss beam?

A larger truss may ultimately be required, but we do not want to assume that before the support arrangement is reviewed.

If an additional center support can create a more suitable support condition, it may reduce the need to enlarge the entire beam system.

The final choice still depends on engineering verification.

Can the center tower be placed behind the main LED beam?

Yes, that is the proposal being discussed.

The center tower can be positioned behind the main horizontal truss and connected forward through a sleeve-block interface.

This avoids placing the vertical tower directly between the main beam lines.

How can the rear tower connect to the existing horizontal truss?

Two connection concepts are being considered.

For a four-side half-connector sleeve block:

sleeve block → short truss → half connectors + clamps → existing beam

For a sleeve-type sleeve block:

sleeve block → half connectors + clamps → existing beam

The exact arrangement depends on the sleeve-block design and final geometry.

Why use four half connectors and clamps?

The four connection points allow the added interface to connect onto the existing truss chords rather than requiring a new permanent connector to be built into the original beam.

The actual structural capacity of that connection still requires verification.

Is the short truss always 250 mm?

No.

Approximately 250 mm is the current concept for bridging the offset between the rear support and the main beam.

The final length depends on the relative position of the tower, sleeve block and horizontal truss.

Does adding a center support automatically double the beam capacity?

No.

There is no universal multiplier.

The actual effect depends on the complete support geometry, beam, load positions, connection details and LED arrangement.

A project-specific structural check is required.

Can this idea be used on existing ground-support truss systems?

Potentially, yes, especially where the existing beam can accept a suitable clamp/interface connection.

But the existing truss dimensions, sleeve block, tower configuration and actual loads must first be confirmed.