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TWINSA

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What We Do

We specialize in engineering connection technology, offering consulting, solutions, products, and engineering services for critical connectors in structural engineering. Our expertise in joints, bearings, seismic devices, and engineering services supports bridges and various infrastructure projects. We leverage cutting-edge innovations, particularly through our Smartz technology, to enhance structural safety, extend longevity, and increase resilience, while delivering greater ROI and reducing carbon emissions for infrastructure and buildings.

What Makes us Different

Engineering Excellence

Our product portfolio offers full coverage across all types of bearings, joints and seismic devices listed under EN and AASHTO specifications and provide innovative engineering services. We are proud of our:

Proven Global Implementation: Successfully deployed in over 30 countries, including Bridge Modular Joints for the Highest-Valued Bridge Project ($18 billion HZM Bridge, China), Structural Seismic Bearings for the Highest-Valued Building Project ($5.5 billion SoFi Stadium), and Seismic Metallic Dampers for the Highest-Valued Railway Project ($46 billion Sichuan-Tibei High-Speed Railway).

Heavy-Duty Engineering Solutions: We hold the world record for the largest Rubber Bearings (2.5m x 2.5m) and have delivered Spherical Bearings up to 100MN and Pot Bearings up to 90MN, and extensive experience in delivering ultra-displacement Modular and Finger joints with movement capacities of up to 1600mm.

Standards Compliance and Drafting: Our products fully comply with major international standards, such as EN and AASHTO, and we have extensive experience with British, Japanese, and Australian standards. With CE certifications for most major categories, we have also contributed to drafting various national level standards including JT/1270.3 Cantilever Joints in China.

Innovation transforming products into services: With over 150 patents generating more than 30% of our revenue, we provide innovative solutions for diverse engineering challenges. Our deep expertise in mechanical engineering, materials science, and IoT drives the transformation of bearing replacement into a re-manufacturing process and rotational hinges into reusable services. These innovations boost client efficiency, cost-effectiveness, and infrastructure sustainability.

Core Tech

Besides our engineering excellence, our key technology, TWINSA (Adaptive Digital TWIN with Smart Adapter), comprises two core elements:

Intelligent Critical Connector:

Through a groundbreaking metrological innovation called In-Situ Dual Calibration (ISDC), we've developed the world's first technology to provide reliable in-situ calibration for load monitoring and controlling of critical connectors such as bearings, cables, and bolts. This establishes dependable lifecycle load monitoring and controlling for critical connectors.

Adaptive Digital TWIN:

Leveraging Intelligent Critical Connectors, this digital twin system offers not only data-driven insights and evaluations into boundary conditions and hence deeper understanding of a structure's current state, but also adaptive capabilities to optimize load conditions in-situ. By transitioning structures into adaptive systems, it greatly enhances structural longevity and safety, reduces initial construction costs and maintenance costs, and contributes to a lower lifecycle carbon footprint.

With over 40 patents and more than 20 project experiences spanning bridges, buildings, and slopes, we're confident this technology will revolutionize the design, construction, and maintenance of structures.

"Except for the patents held by the commissioning organization of this project, there are no reports in the global literature of a calibration technology for force-measuring devices that allows for calibration under load without altering the position or load-bearing condition of the device."

TWINSA system can be used in bearings (Bearingsmart), cables (Cablesmart) and bolts (Boltsmart). In different applications, TWINSA provides the key to understand actual boundary conditions.

Three 14,000-ton Smart Pendulum bearings (supplied by IEC Inc., the world's largest by load capacity) are installed. Their high load and stiffness make the load distribution highly sensitive to sub-millimeter height variations.

The wind turbine tower is anchored to the base using high-strength bolts. Even tion will be achieved during installation, but various factors such as vibrations can cause changes in the bolt preload force.

Founders,
Passion for Innovation

Passion for technology

Cross Disciplinary R&D Team

We highly value the role of engineering connections in structural engineering and are committed to revolutionizing the field through cross-disciplinary research. Since our founding, we have built a strong technical team with diverse backgrounds and work closely with research institutes, infrastructure investors, and consultants to innovate, optimize, and deliver advanced solutions and products.

Founders, Passion for Innovation
TG Wu
President Emeritus Principal Consultant Engineer

TG holds a B.Sc. in Metal Processing from Chongqing University (CQU), one of the leading institutions in the field. He has held key technical positions in the Bridge Component Manufacturing Division under China’s Ministry of Transportation (MOT). In the 1990s, TG led delegations on behalf of the MOT to establish partnerships with MAURER, MAGEBA, and D.S. Brown for the technical import of expansion joint systems, significantly advancing China's bridge expansion joint technology to align with international standards.Also a successful entrepreneur, TG supported Darcy in founding the IEC Inc, he is retired but continues to contribute as a Principal Consulting Engineer, focusing on metal material processing and participates in R&D projects. He also serves as President Emeritus of IEC Inc.

Darcy Wu
President Product Manager

Darcy is a Ph.D candidate and part time researcher in Engineering Mechanics from China State Key Laboratory for GeoMechanics and Deep Underground Engineering, and holds an M.Sc. in Information Systems from the University of Warwick, along with a B.Sc. in Control Engineering from Chongqing University (CQU). He has extensive IST experience as a consultant for IBM, Capgemini, and Deloitte Consulting after 2 years of working in USL, the leading company of Expansion Joints systems in the UK, and founded IEC Inc., with support from TG, his father.In addition to his role as president of the company, as an innovation enthusiast, he acts as product development manager and dedicates both company resources and personal time to R&D activities and lab works. Darcy is the inventor and patent holder(40+ patents) of the TWINSA system.

Structural and Mechanical Engineering, ICT and Material Science, and more...
Jason Wang
VP, Tech and QHSE Head

Jason Wang, Ph.D. in Civil Engineering from Southwest Jiaotong University, is a founding key member of IEC Inc. and a former Senior Engineer specializing in Bridge Besign and Seismic Analysis. At IEC, he leads the R&D, technology, and QHSE teams—overseeing more than 60 members—and manages seismic product projects.

Sheen Leung
Principal Engineer: Structural Engineering

Sheen, who holds a Ph.D. in Structural Engineering from the University of Cambridge, joined IEC Inc. in 2021 after gaining extensive experience in engineering design in London, focusing on mechanical design and structural analysis. At IEC, he leads a team of five structural engineers, aligns R&D efforts with structural engineering goals, approves structural solutions, and oversees the recently established Brisbane R&D center.

Meng Hu
Principal Engineer: International Tech

Meng, with a B.Sc. in Mechanical Engineering from SWJTU and over 12 years of experience, is a founding member of IEC specializing in mechanical product design for joints, bearings, and seismic devices in line with AASHTO, EN, BS, and JIS standards. At IEC, he oversees technical aspects of international projects, ensuring compliance with global standards while managing project teams and fostering innovation in structural engineering solutions.

Henry Ren
Principal Engineer: IoT and Software

Henry, with an M.Sc. in Control Engineering and a B.Sc. in Computer Science from the University of Electronic Science and Technology of China (UESTC), brings over 15 years of experience from IBM as a Senior Engineer in data analysis and software development. At IEC Inc., he leads a team of five in developing IoT systems for the TWINSA platform and digital twin solutions and oversees the IT department.

Shawn Li
Principal Engineer: Expansion Joint systems

Shawn is an M.Sc. candidate in Mechanical Engineering at SWJTU, with over 25 years of expertise in expansion joint systems. He has applied for more than 20 patents related to modular and finger joint systems and has successfully completed over 10 large-displacement joints projects exceeding 1000 mm. As founding key member, Shawn is responsible for the final approval of all joint designs at IEC Inc..

John Chow
Principal Engineer: Load bearing products

John, holding an M.Sc. and B.Sc. in Mechanical Engineering from SWJTU, brings over 20 years of experience in designing and analyzing load-bearing components, including Mega-newton bearings over 100MN and advanced metal/viscous damper systems. As a founding member of IEC Inc., he has led and managed over 20 major projects and is responsible for the final approval of all bearing-related designs

Jerry Leung
R&D Project Coordinator

Research coordinator Jerry holds a B.Sc. in Applied Mechanics from Sichuan University and has over 15 years of experience in R&D management and Lab management. At IEC Inc., Jerry manages the Project Management Office (PMO) and oversees the execution of all R&D projects

YI Pu
Principal Engineer: Polymer products

Yi Pu, an expert in high-reliability Polymer materials for high-speed trains with a focus on formulation development and experimental validation, joined IEC Inc. in 2018. At IEC, he leads a team of four engineers dedicated to developing polymer products

Significant Growth

Strong Collaboration with Leading Research Institutions and Top Scientists

We maintain close collaboration with the State Key Laboratory of Deep Geomechanics and have co-founded the Smart IoT Research Center (SIOT Center) to drive innovation in structural monitoring and IoT systems.

He Mancao, head of SIOT center, is a renowned scientist in Rock Mechanics, with a focus on landslide and earthquake prediction, earning global recognition. He serves as the Vice President of the International Society for Rock Mechanics and Rock Engineering (ISRM) and is an Academicianof the Chinese Academy of Sciences. As a mentor to Darcy, the President of IEC, He Mancao guides R&D projects at the SIOT center, particularly in the area of cable newton force measurement, providing reliable data for landslide predictions.

Our research center also collaborates with leading scientists from various disciplines, these experts contribute on a part-time and project basis, some being on board of directors, fostering strong interdisciplinary collaboration.

We are engaging technology cooperations also with leading universities worldwide, Research center to be established worldwide for further explorations of our core technology.

Strong Investment in R&D

We invest over 7% of our revenue into research and development. By 2024, we have contributed to the publication of 6 SCI-indexed papers, hold 152 patents, and have played a key role in the development of 4 national-level standards.

IEC and Academician He Manchao from the Chinese Academy of Engineering have jointly established the Intelligent Monitoring and Control Technology Research Center at the State Key Laboratory of Deep Geotechnical Mechanics and Underground Engineering.

IEC's In-House Compression-Shear Testing Machine with 30000kN and 5000kN Vertical Load Capacity and 15% Horizontal Load Capability respectively

Significant Growth

Since our inception in 2016, we have consistently maintained an annual growth rate exceeding 40%. By 2023, our revenue surpassed $42 million USD, driven by growth in our TWINSA technology and innovative products. Today, we proudly have over 300 professionals across 12 locations in China, Australia, and Singapore.

IEC's In-House Compression-Shear Testing Machine with 30000kN and 5000kN Vertical Load Capacity and 15% Horizontal Load Capability respectively

Management Facilities and
Quality Assurance

Management

The management team and staff at IEC embody professionalism, energy, and a customer-oriented approach that drives our company forward. Each member contributes unique expertise and passion, making them invaluable assets to IEC’s growth and success. Their dedication to understanding and meeting client needs, combined with a commitment to excellence, ensures that IEC consistently delivers high-quality solutions. Together, their collaborative spirit and focus on customer satisfaction empower IEC to continually expand its capabilities and uphold its reputation in the industry.

Bo Jing
General Manager

Bo holds an MBA from City University Malaysia and has 20 years of management experience, including 10 years in quality assurance (QA) roles. He brings extensive expertise in quality systems (QS) compliance.

Shaolin Wang
Director, International operations

Shaolin has both an MBA and a BA in International Trade. He possesses 20+ years of experience in international business development. In addition to overseeing quality compliance with international standards, Shaolin has also served as the CEO of IEC Singapore.

Shirely Chen
Director, Logistics and Supply Chain

Shirley brings over 15 years of expertise in logistics and operations, demonstrating a proven track record of optimizing supply chain processes, improving efficiency, and ensuring smooth operational management across various industries

Alex Hao
Director, Accounting

Alex holds an MBA and brings a wealth of experience in finance and accounting. Prior to joining IEC, he worked extensively with European companies and has a strong understanding of both European and American accounting standards.

Facility

IEC’s manufacturing facilities, spanning a vast area of 36,000 square meters, are equipped with advanced machinery and technology, enabling us to produce top-quality products with precision and efficiency. Our facilities feature laser-cutting machines for intricate metal fabrication, a 5-meter diameter lathe for large-scale machining, and 3,500-ton vulcanizing machines for robust rubber processing. We also maintain an extensive rubber mixing line to ensure material consistency and quality.

Assembly for Load-Measuring Bearings

IEC Workshop's Ultra-Large Lathe (5m Diameter)

Quality Assurance

IEC upholds rigorous quality control standards across all aspects of its manufacturing and testing processes, ensuring that every product meets international benchmarks for excellence. Our structural bearings and seismic devices are CE certified, attesting to their compliance with European quality and safety standards. Additionally, IEC’s modular expansion joints and rubber bearings have successfully passed AASHTO testing, confirming their resilience and durability for demanding applications.

IEC's in-house, CNAS-accredited laboratory, recognized internationally through the ILAC Mutual Recognition Arrangement (MRA), ensures that our test reports are accepted on par with those from NATA-accredited laboratories in Australia. Our state-of-the-art facilities conduct rigorous testing on structural bearings, rubber compounds, and steel raw materials to meet stringent performance and durability standards. IEC’s commitment to quality is reinforced by ISO 9001 certification for quality management and ISO 17025 accreditation, demonstrating our dedication to delivering reliable, high-performance solutions with consistency and precision

  • ISO 9001:2018,

    Quality Management

    System

  • ISO 14001:2015,

    Environmental Mangaement

    System

  • ISO 45001:2018,

    Health and

    Safety Management

    System

  • ISO 17025:2017,

    Compentence of

    Testing and

    Calibration Laboratories

  • AASHTO Test Report

    (Rubber Bearing)

  • AASHTO Test Report

    (Modular Joint)

  • EN ISO Welder

    Qualification Certificate

  • CE Certificate

    (Spherical Bearing)

Product Lines

Expansion Joints

Our expertise in expansion joints combines innovation, high standards, and global experience. Focused on quality and adaptability, we deliver solutions for the toughest infrastructure challenges. Key strengths include:

• Technical Expertise: experience of high-displacement modular and finger joints with 1600mm movement capacity, supported by 20+ patents.

• Global Reach: Proven global reach, with extensive annual supply of joint systems to the UK, and successful delivery of 20+ projects world wide, including Qatar World Cup infrastructure and HZM, the world's most expensive Bridge.

• Standards Leadership and conformity: Primary drafter of national standards, delivering comprehensive mainstream solutions with full AASHTO conformity and third-party certifications, including OMV, SPO, and fatigue tests.

• Innovation: Patented technology offering enhanced precision, cost-efficiency, and structural resilience.

Joints Type Specifications IEC Expertise & Highlights
Modular Joints EOTA EAD 120113-00-0107,AASHTO LRFD 14.5,
CD357(BS)		 Supplied and installed over 40,000 linear metersin signature projects,including the iconic Hong Kong- Zhuhai-Macau Bridge,the world’s most expensive bridge. These joints have achieved ultra-displacement ca pacities up to 1600 mm. Over 50,000 linear meters installed in the UK, with AASHTO-compliant performance tests.
Cantilever Finger Joints EOTA EAD 120111-00-0107,
CD357(BS),
JT/T 1270.3(CHN) 		Supplied and insta lled over 50,000 linear meters with movement ranges from 40-320 mm. IEC was the chief author of JT/T 1270.3,China’s national standard for cantilever joints.
Supported Finger Joints EAD 120112-00-0107,
CD357(BS)		 Extensive experience in designing and installing innovative rotationalfinger joints with movement capacities up to 1600 mm.
Mat Joints EAD 120110-00-0107,
CD357(BS)		 Patented technology offering excellent noise reductionand smooth ride-through performance.
Flexible PlugJoints CD357(BS) Experienced in Elastic PolyurethaneJointPUand approved in Hongkong Highway Department
Nosing Joints EOTA EAD 120109-00-0107,
CD357(BS)		 Primarilyused in building projects with limited application in bridge applications.
Non- Standard IEC proprietary

SwiftLink Finger Joints:Enables pre-embedding and quick connection of components,boosting installation efficiencywith over 10,000 LM insta lled.

Seismic Cable Joints: A cable restraint system integrated into joints, allowing thermal movements while limiting seismic displacements.

Bearings

Our bearings meet the highest standards for performance and reliability, suited for diverse infrastructure needs. Designed for durability, easy maintenance, and adherence to international standards. Key strengths include:

• Proven Track Record: Extensive experience in both bridge and building projects.

• Standards Compliance: Comprehensive coverage of key international standards, with CE certification for major categories.

• Capacity and Reliability: Providing high-capacity, reliable solutions, including spherical bearings up to 100MN, pot bearings up to 90MN, and holding the world record for the largest rubber bearings(2.5m by 2.5m).

• Innovation: Innovative features tailored for specific structural challenges.

Bearing Type Specifications IEC Expertise & Highlights
Elastomeric Bearings EN 1337-3,
AASHTO LRFD14.7.5		 Industry-leading capability; developed world's largest rubber bearings(2.5m x 2.5m),CE certified.
Pot Bearings EN 1337-5,
AASHTO LRFD14.7.4		 Proven track record;successfully implemented bearings with 90MN capacity. CE certified.
Spherical and Cylindrical Bearings EN 1337-7，
AASHTO LRFD14.7.2 (PTF Sliding Surfaces) 		Advanced technical proficiency; delivered bearings with a 100MN capacity and proprietary high-performance sliding material. CE certified.
Guide and Restraint Bearings EN 1337-8 Innovative design portfolio, specializing in wind- resistant bearings.
Rocker and Roller Bearings EN 1337-6 Extensive experiene with rocker bearings in rail bridge applications.Limited use of roller bearings due to less frequent specification in moden bridge designs.
Non-Standard Bearings EN 1337-4

Wind-resistant Bearing:Resists wind loads and horizontal forces while allowing thermal movement.

Tension-Compression Bearing: Handles both tensile and compressive forces, ideal for uplift resistance and multi-directional support.

Self-aligning Slope Bearing: Adjusts to deck slope changes with spherical rotation ensuring even load distribution for longer lifespan.

Seismic Devices

Our seismic isolators ensure unmatched stability and performance under extreme conditions, safeguarding critical infrastructure. Supported by a dedicated seismic analysis PHD team, we develop solutions that meet international standards. Key highlights:

• Proven Performance: Successfully implemented in iconic projects like SoFi Stadium (US) and the ST-HSR (China).

• Innovative Solutions: leverage diverse engineering principles and deep structural understanding, enabling tailored designs that suit unique structrual requirements.

• Global Standards Compliance:Fully aligned with EN and AASHTO, ensuring reliability across diverse projects.

Category Specifications IEC Expertise & Highlights
Rubber Isolators: Lead Rubber Bearingsand High Damping Rubber Bearings EN 15129: 8.2.1,
AASHTO LRFD S14		 Extensive design and implementation expertiseProven track record with UltraHDR,achieving a 22% damping ratio, 450% horizontal deformation,and a maximumdiameter of1600mm.
Sliding Isolators: Friction Pendulum Systemsand Sliding bearings EN 15129:8.3,
AASHTO LRFD:14.7		 Delivered Ultra Ca pacity PB bearings with a capacity of140MN. Innovative design offering distinct transverse and longitudinal stiffness.Vast implementation experience,including supplying 6,000 units of sliding bearings for the SoFi Stadium in Los Angeles, the world's most expensive building.
Dissipator: Viscous Dampersand Metalic Dampers EN15129:7,
AASHTO LRFD:15		 Expertise in delivering viscous dampers with up to3500kN capacity and patented overload protection systems. Extensive experience with metallic dampers, particularly in high-speed railway(HSR) bridges, including the $46 billion ST-HSR project in China,one of the world’s most expensive rail projects.
ShockTransmission Units(STUS) EN 15129:7.6，
AASHTO LRFD:15		 Expertise in bridges and buildings, with patented integration into bearing systems for enhanced performance.
Displacement Restraint Devices EN 15129:6，
AASHTO LRFD:15.2		 Extensive experience with patented technologies; authorednationalstandards.Supplied Cable Restrained Bearings with ca pacities of up to 100MN.
Non-Standard Seismic Devices IECProprietary Innovative devices combining spherical bearings and laminated bearings with precise stiffness control. Experience with more than 20 projects involving Cable Restrained Bearings,which have now been upgraded into new standards.

Innovative Engineering Service

Building on our advanced technologies, we provide innovative engineering services that deliver real value.

Bearing Re-manufactunng Remanufacturing is an approach which focuses onrefurbishing undamaged parts and replacing womcomponentslike friction materials, offering a more cost-effective and eco-friendly alterna tive to full replacementlEC,in collaboration with China's National EngineeringCenter, pioneered the pilot remanufacturing projec onthe Sutong Bridge (span at 1088 meters, by then theworld's longest cable-stayed bridge),remanufacturinghundredsof pot andspherical bearings.
Removable Top-of- PierRotation System Bridge rotation systems allow construction of highwaybridges parallel to railways before rotating them intoposition, minimizing rail traffic disruption.Unlikeconventionalpermanent bottom-of-piermethods, lEC's innovative system allows for postrotation removal of the mechanism,enabling loadtransfer to permanent bearings and reuse in futureprojects. Enhancing efficiency, cost-effectiveness, andsafety.
Structural HealthMonitoring and Beyond lEC SHM systems provide continuous monitoring ofstructural conditions using state-of-the-art sensors,primarily non-contact types for periodic calibration. OuradvancedTWINSAsystemelevates SHM to an adaptivetwin system, offering deeper insights into structures andenabling adaptive structural optimization and riskmitigatione-a technology we believe represents thefuture of structuralengineering.
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