Innovation

  • Innovation
  • HPS
Redefining Structural Engineering,
Integrated System for Site Excellence
With the HPS method and decking system,
we deliver both structural stability and construction efficiency.
The Engineering
Vision of YUNJUN
ST R&D Center
Finding the optimal solution that satisfies safety, cost-efficiency, and constructability.
  • Can we exceed the structural
    performance of steel pipes
    while making installation safer?
  • Could strut spacing be
    widened even further?
  • Could a hydraulic jack and
    wedge system be designed without
    concerns about brittle fracture?
  • Is 2m really the limit
    for decking plate length?
HPS STRUT & WALE
The force behind safe excavation: The HPS Methodology.
When conventional steel reaches its limits,
a safer and more efficient alternative is required.
The Evolution of Shoring: HPS STRUT & WALE

The HPS methodology significantly suppresses deformation and buckling, allowing for a minimal quantity of support members.
This ensures higher structural stability with fewer materials under identical load conditions.

Is there a steel solution that is both stronger and safer?
Resistance
Performance
Resistance
Performance
Superior resistance to torsion, bending stress, and lateral-torsional buckling
Lacks sufficient resistance to torsion, bending stress, and buckling
Lacks sufficient resistance to torsion, bending stress, and buckling
Operational
Stability
Operational
Stability
Higher risk of instability during installation and operation
Provides maximum stability throughout the entire construction lifecycle.
Provides maximum stability throughout the entire construction lifecycle.
Compatibility
Compatibility
Low compatibility with other structural components
Excellent compatibility with various members and modular systems.
Excellent compatibility with various members and modular systems.
Safety & Logistics
Safety & Logistics
Unstable during material stacking and transport
Enhanced safety during loading, transport, and on-site handling.
Enhanced safety during loading, transport, and on-site handling.
The answer is HPS. HPS is Setting the New Standard for Earth Retention
HPS H-Beam
Safety Cost-Efficiency Maintainability Schedule Acceleration Constructability
Safety
  • Integrated connectors ensure seamless structural performance between the main body and joints
  • Engineered to eliminate the risk of brittle fracture in all components
  • Exclusive use of 400-ton hydraulic jacks and high-capacity wedges (300t/500t)
Cost-Efficiency
  • Significant reduction in the number of struts, wales, and center piles required
  • Maximized underground workspace lowers overall civil and structural construction costs
  • Provides at least a 15% reduction in total construction expenses compared to conventional H-Beams
Maintainability
  • Struts can be equipped with safety handrails to serve as secure pedestrian walkways
  • Exceptional modular compatibility allows for rapid inspection and maintenance
Schedule Acceleration
  • Reduced quantity of internal temporary members and the elimination of bracing accelerate the timeline
  • Increased center pile spacing speeds up excavation and structural works
  • Reduces construction time by over 20% compared to H-Beam methods
Constructability
  • Strut installation spacing is 1.5 to 2 times wider than that of H-Beams
  • Bolt-on system eliminates the need for on-site welding
  • Engineered to maintain stability without separate bracing members
1 HPS Wale Installation
2 Strut Installation
3 HPS hydraulic jack and wedge Installation
1 HPS Wale Installation
Secured via bolt-on connections;
no stiffeners required
2 Strut Installation
Connected to support beams using H-bands or I-bolts
3 HPS hydraulic jack and wedge Installation
Inclined struts can be installed

HPS Components

Strut & Wale, Wedge, Hydraulic Jack

HPS Sectional Properties
View Specs
HPS Specification Unit Weight
(kg/m)		 Cross-Sectional Area
(cm2)		 Total Shear Area
(cm2)		 Moment of Inertia (cm2) Section Modulus(cm2) Radius of Gyration(cm2)
x-x y-y x-x y-y x-x y-y
450x450x6x12 190 177.23 107.30 63,840 30,545 2,743 1,358 18.98 13.13
450x450x6x16 210 211.15 123.00 78,893 35,684 3,378 1,586 19.33 13.00
450x450x6x20 240 245.07 134.42 93,378 40,823 3,988 1,814 19.52 12.91
* Unit weights are based on 10m members; weights may vary by specific component.

HPS #-DECK & HPS #-BEAM:
Advanced Structural Support
Systems

HPS Decking System: Structural Excellence
for Overhead Operational Safety

A Secure Platform for Concurrent
Underground and Surface Operations

HPS Decking Plates and Main Beams cover excavated underground spaces, ensuring the safe movement of personnel, equipment, and materials. This system enables simultaneous operations above and below ground.

It is more than just a temporary cover; it is a high-performance structural platform designed to maximize operational efficiency within the constraints of limited site space

Conventional Decking Methods
and Their Ongoing Challenges

Traditional decking methods require main beams to be densely spaced — typically every 2 meters — to accommodate standard plate dimensions.

This increased beam quantities restrict the movement and logistics of equipment and personnel.

Conventional H-Beam systems often require additional bracing and stiffeners to counter buckling and vibration, complicating the installation and dismantling process.

As a result, this complexity leads to frequent interference between civil and architectural works, making it difficult to optimize both project timelines and costs.

Safety must be secured, but reducing both time and cost is not easy.

To solve these structural limitations, YUNJUN ST developed HPS #-DECK and HPS #-BEAM.

1 HPS #-DECK
2 HPS #-BEAM
1 HPS #-DECK: Accelerating Timelines with 4m Long-Span Technology
The HPS #-DECK boasts 2.7 times more coverage area and double the rigidity of conventional decking plates. By extending the main beam spacing to 4 meters, it achieves superior constructability, cost-efficiency, and safety, significantly accelerating the project schedule.
2 HPS #-BEAM: The Robust Square Main Beam for Long-Span Support
Dual-web structure with internal flanges maximizes bending and shear strength. Over 150% stronger than conventional H-Beams, it can also serve as permanent structural columns.
Bending Strength Comparison: HPS #-BEAM
Scroll

Wider, Stronger, Faster.

The HPS #-BEAM is a high-rigidity box-section main beam designed to maximize resistance against bending and buckling while minimizing reliance on external bracing.
\Complemented by the HPS #-DECK, a long-span decking plate engineered for enhanced durability, this system redefines temporary structural limits.
By integrating this combination, the main beam spacing can be extended to 4 meters, effectively reducing the required beam quantity by approximately 50% and significantly increasing the coverage area per installation cycle.

Constructability
The expanded coverage area simplifies the installation and dismantling process, streamlining site logistics and maximizing overall operational efficiency.
Cost-Efficiency
Extending the main beam span to 4 meters reduces the total beam count by half, delivering substantial savings in both material and labor costs.
Safety
The synergy between the high-rigidity HPS #-BEAM and the reinforced HPS #-DECK creates a stable, vibration-resistant workspace with superior resistance to bending and buckling

HPS vs. Conventional: Efficiency and Cost Comparison

Conventional Decking HPS Decking System

THE POWER OF
HIGH PERFORMANCE STEEL

Uncompromising safety standards, regardless of ground conditions.
From soft soils to deep-seated excavations, tougher conditions demand more robust structural integrity.
The YUNJUN ST HPS Methodology integrates struts, wales, decking plates, and main beams into a unified structural ecosystem,
delivering a reliable earth retention solution for any environment.
Witness the seamless integration and superior performance of the HPS System in action.