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Views: 12 Author: Site Editor Publish Time: 2026-08-30 Origin: Site
The customer already had a 6.1 m diameter round stage.
Access to the stage was not a new requirement. He already had a working stair arrangement made from standard rectangular stage steps.
The existing solution was simple:
three straight stair modules;
approximately 1 m wide each;
placed side by side;
two steps per module;
approximately 3 m total access width.
Functionally, it worked.
Visually, however, the stairs remained straight while the front edge of the stage was circular.
The customer's request was therefore not:
“I need stairs for my stage.”
It was more specific:
“I need 3 meters of curved stairs, two steps.”
That small change—from straight to curved—was where the quotation process started.
The customer's existing solution used ordinary rectangular stage stairs in front of the round stage.
Three approximately 1 m wide stair units were placed beside each other to create a total entrance width of around 3 m.
Each unit had two levels.
This gave the customer the access width he wanted, but the geometry of the stairs did not follow the circular edge of the stage.
Suggested caption: The customer's existing solution used three straight two-step stair modules to create an approximately 3 m wide entrance in front of the round stage.
The important point is that we did not need to change the basic modular idea.
The customer already liked the 3 m overall access width.
What needed to change was the geometry.
When the customer first asked for the curved stairs, his message was:
“3 meter of curved stairs; 2 steps.”
Before making a quotation, we needed to know what circle those stairs were supposed to follow.
We first asked whether the stage diameter was 10 m or 6 m, because the initial information was not completely clear.
The customer clarified:
6.10 meter — 6 m and 10 centimeter.
That immediately gave us the basic curved geometry.
The stair was not an independent decorative arc.
It needed to follow the front perimeter of an existing 6.1 m diameter circular stage.
The next question was:
What height does the stair need to reach?
Initially, the customer did not know.
He needed to return home and measure the existing stage.
That is a very normal part of customized quotation work.
Instead of guessing from a standard stage height, we waited for the actual measurement.
The next day, the customer confirmed:
“The highest step may be 35 cm.”
That gave us the second key condition:
round stage diameter: 6.1 m
stage / highest stair level: approximately 0.35 m
stair arrangement: two steps
required curved access length: approximately 3 m
Only after those dimensions were clear could the stair geometry be defined properly.
There was one misunderstanding during the quotation that is worth keeping in this Case Study.
After confirming the diameter and height, we prepared a quotation for:
6.1 m diameter round stage, 0.35 m high, with a 3 m long circular two-step staircase.
But that was not what the customer actually wanted to buy.
He replied:
“I would only need the stairs without the stage.”
We had interpreted the dimensions as a request for a complete new stage-and-stair package.
The customer was actually giving us the dimensions of his existing stage so that we could make stairs to match it.
So the quotation was corrected from:
complete round stage + curved stairs
to:
curved stairs only.
This looks like a small communication mistake, but it exposes an important rule in custom structural quotation:
A customer may provide the dimensions of an existing structure without asking you to supply that structure.
Before finalizing a BOQ, we need to distinguish:
What already exists?
from:
What does the customer actually need us to supply?
That is exactly the type of requirement clarification that DragonStructure Case Studies are meant to preserve.
Once the quotation was narrowed to the staircase only, the customer asked another important question:
“Is the inner curve 3 meter or the outer curve?”
For a straight staircase, saying “3 m wide” is usually straightforward.
For a curved staircase, it is not.
The inner curved edge and outer curved edge have different lengths.
In this project, the approximately 3 m dimension referred to the inner curved side of the complete staircase run.
That definition mattered because it determined the module geometry.
This is a useful lesson for any circular or curved platform:
Do not quote a curved stair only from “3 m long.” First define where the 3 m is being measured.
The customer then asked:
“Is it in 3 parts?”
The final solution remained modular, but because it was a two-step staircase, the complete assembly contained six curved stage sections:
3 curved modules for the inner / upper step
3 curved modules for the outer / lower step
The inner curved side of the complete three-module run was approximately 3 m in total, so each inner module was approximately 1 m along that curved edge.
Conceptually:
Existing straight solution
3 straight modules × approximately 1 m
= approximately 3 m entrance width
became:
New curved solution
3 m curved two-step access system
The module count logic was therefore surprisingly similar.
We did not turn a simple modular stair into one oversized custom component.
We changed the shape of the modules.
This is the main decision in the case.
The customer's original stairs already demonstrated a useful pattern:
Three smaller stair modules can be combined to create one wide entrance.
There was no good reason to abandon that principle when changing to a curved staircase.
A single 3 m long curved component would be larger to manufacture, handle, transport and store.
Instead, the final design kept the sectional approach.
The change was:
rectangular stage deck geometry
→
arc-shaped stage deck geometry matching the 6.1 m round stage
The complete solution therefore remained easier to divide into individual modules.
The final proposal was based on the confirmed customer requirements:
Item | Final Configuration |
|---|---|
Existing stage | Round stage |
Stage diameter | 6.1 m |
Stage / upper level height | Approx. 0.35 m |
Stair type | Curved / circular two-step staircase |
Approx. inner curved length | 3 m total |
Modules across the arc | 3 |
Step levels | 2 |
Total curved stair sections | 6 |
Main deck surface | 18 mm plywood |
Surface | Anti-slip stage surface |
Intended use | Indoor / outdoor event stage access |
Module connection/support | Stage leg clamp arrangement |
For readers who need the complete product configuration rather than the quotation story, the related DragonTruss page is:
6.1m Diameter Circular Round Stage Platform with Curved 2-Step Staircase for Events
https://www.dragontruss.com/6-1m-Diameter-Circular-Round-Stage-Platform-with-Curved-2-Step-Staircase-for-Events-pd152121338.html
That page answers what the complete stage system is; this Case Study answers why the stair changed from straight modules to curved modules and how the dimensions were clarified.
The customer's existing straight stairs already provided access.
So the new stair was not created because straight stairs suddenly stopped working.
The reason was geometric integration.
With straight stair modules placed against a circular stage, the front access system and the stage perimeter follow different shapes.
The curved staircase instead follows the stage radius.
Suggested caption: The proposed staircase follows the circular geometry of the 6.1 m stage while retaining a modular two-step arrangement.
This creates a continuous curved access zone rather than attaching several rectangular units to the front of a circular platform.
That is primarily a configuration and appearance decision, not a claim that the curved version has a higher structural capacity.
The stair system uses separate support legs under the stage sections.
Adjacent modules can be positioned and connected using the stage leg clamp arrangement.
Suggested caption: Adjustable stage legs and leg clamps are used as part of the modular support and connection arrangement between adjacent stair sections.
The leg system also allows the stage sections to be supported independently while the individual curved pieces are assembled into one continuous staircase.
This modularity is useful because the customer does not have to move or store one single large curved staircase.
For broader temporary stair and circulation configurations, DragonStructure also groups related solutions under:
Stair & Walkway Structure
https://www.dragonstructure.com/Stair-Walkway-Structure-pl05055276.html
During the same conversation, the customer also asked:
Is this floor material suitable for outside?
How thick is the floor plate?
Is it anti-gliding?
Those questions were not separate marketing questions.
They came because the customer was deciding whether the proposed stair could actually be used with his event stage.
The information provided during the quotation was:
18 mm plywood deck
anti-slip surface
intended for normal indoor and outdoor event-stage applications
These details mattered because the customer was not buying a decorative curved object.
People would actually use it as stage access.
At the same time, “outdoor use” should not be interpreted as meaning that plywood stage decks can remain permanently exposed to weather without appropriate care and storage.
The BOQ evolution in this project was simple but instructive.
6.1 m round stage + 3 m curved two-step stairs
“I only need the stairs.”
3 m curved two-step stair system for the customer's existing 6.1 m stage
That correction removed the entire main stage from the quotation.
Then the stair itself was clarified as:
3 upper curved modules + 3 lower curved modules
rather than one complete oversized stair section.
This is a good example of why custom quotation should not jump directly from a dimension to a component count.
First define:
existing equipment → required addition → geometry → module division → connection.
Only then finalize quantities.
This project was mainly a geometry and quotation-customization exercise rather than a formal engineering study.
existing round stage diameter: 6.1 m
required highest stair level: approximately 0.35 m
curved staircase required: approximately 3 m
two-step arrangement
3 modules along the curved run
6 stage pieces in total
customer only required the stairs, not a new stage
18 mm plywood surface
anti-slip deck requirement
delivery quotation to Belgium was also requested
The decision to keep the staircase modular rather than producing one very large curved section reflects practical manufacturing, transport, storage and event-equipment handling considerations.
This case does not provide verified:
stair load calculations;
occupancy rating;
structural certification;
outdoor weather rating;
code compliance;
engineering approval.
Those should not be invented merely because the stair resembles other modular stage systems.
The DragonStructure governing rules specifically require this distinction between confirmed project facts, experience-based judgment and verified engineering conclusions.
At first glance, this project looks almost too simple for a Case Study:
Change three straight stairs into curved stairs.
But the real quotation process contained several decisions:
The customer said 3 m curved stairs.
We first had to determine:
6 m or 10 m diameter?
Then:
What height?
Then we mistakenly quoted:
stage + stairs.
The customer corrected:
stairs only.
Then came another question:
Is the 3 m measured on the inner curve or outer curve?
And finally:
How many pieces?
Only after those questions were answered did “3 m curved stairs” become a manufacturable configuration.
The transferable lesson is therefore:
For curved access structures, a length alone is not enough. You need the parent circle, height, measurement reference, module division and connection method before the quotation is really defined.
That is the actual value of this case.
If you already have a circular stage and only need new curved access stairs, send us:
stage diameter;
stage height;
required number of steps;
required total stair width / arc length;
whether the dimension refers to the inner or outer curve;
photos or drawings of the existing stage;
existing leg/support system;
preferred deck surface;
quantity;
delivery destination.
Most importantly, tell us clearly:
Do you need a complete new stage, or only stairs to fit the stage you already own?
That one sentence would have eliminated the first quotation revision in this project.
Yes. That was exactly the final requirement in this case. The customer already owned the stage and only needed the curved two-step staircase. We therefore used the existing stage diameter and height as the dimensional reference for the stair quotation.
It must be defined before production because the two arc lengths are different. In this project, the approximately 3 m dimension referred to the inner curved side of the complete three-module stair run.
The staircase had two levels. Three curved modules formed one step level and another three formed the second level, giving six curved platform sections in total.
A modular arrangement is generally more practical for production, transport, handling and storage. In this project it also preserved the logic of the customer's original three-module straight stair arrangement.
Yes, but the geometry would need to be developed from the actual stage diameter and required stair dimensions. A staircase made to follow a 6.1 m stage should not automatically be assumed to fit a different diameter.
