Product
Combined Walls
Combined walls system are a combination of sheet piling and steel pipes or King piles to achieve a bigger moment where single sheet piles can not bear the loads. Combiwalls are particularly used in deep excavation and heavy marine environments in which extensive strength and longevity are key components. The possibility to use different combinations in combined walls allows them to take loads that cannot be taken by conventional sheet piles. Due to the arching effect the king piles bear all the loads and intermediate sheet piles have only an earth-retaining and load-transfer function and they may be shorter than the king piles. Combi-wall system has bigger than 40,000 cm³/m.
Advantages of Combined Wall Systems
Combined sheet pile walls can be classified as tubular combined walls and HZM/HZ combiwall. They are made of three component:king piles(steel pipes or H beams),intermediary sheet piling,and interlocks.The king piles will carry most of the load,including substantial vertical loads in addition to the normal bending loads. The sheet piles are usually shorter, varying from 60% to 100% of the length of the king pile. The double sheet piles alternate throughout the wall to form the water-tight seal and continuous wall. This type of system can be used in any soil conditions and has a high level of re-use. It is suitable for both permanent and temporary use.The corner piles are normally a C 6,C9,or E21,E22 connections.
Combined sheet pile walls can be classified as tubular combined walls and HZM/HZ combiwall. They are made of three component:king piles(steel pipes or H beams),intermediary sheet piling,and interlocks.The king piles will carry most of the load,including substantial vertical loads in addition to the normal bending loads. The sheet piles are usually shorter, varying from 60% to 100% of the length of the king pile. The double sheet piles alternate throughout the wall to form the water-tight seal and continuous wall. This type of system can be used in any soil conditions and has a high level of re-use. It is suitable for both permanent and temporary use.The corner piles are normally a C 6,C9,or E21,E22 connections.
| Combined Wall System Specifications | ||
| Parameter | Tubular Combined Wall | HZ Combined Wall |
| Primary Pile Type | Steel Pipe Pile | HZ King Pile |
| Secondary Element | Steel Sheet Pile | Steel Sheet Pile |
| Diameter / Section | 600–2000 mm | Various HZ sections |
| Length | 12–40 m | 12–40 m |
| Steel Grade | Q235 / Q355 / ASTM | Q355 / ASTM |
| Application | Quay Walls, Marine Structures | Port Construction, Retaining Walls |
| Parameter | Tubular Combined Wall | HZ Combined Wall |
| Primary Pile Type | Steel Pipe Pile | HZ King Pile |
| Secondary Element | Steel Sheet Pile | Steel Sheet Pile |
| Diameter / Section | 600–2000 mm | Various HZ sections |
| Length | 12–40 m | 12–40 m |
| Steel Grade | Q235 / Q355 / ASTM | Q355 / ASTM |
| Application | Quay Walls, Marine Structures | Port Construction, Retaining Walls |
- 🏗 High Structural Strength
- ⚙️ Efficient Structural Design
- 🌊 Ideal for Marine Engineering
- 🔧 Flexible Engineering Solutions
Product Categories
Tubular Combined Wall
The king piles are steel pipes,normally are spiral welded steel pipes do to big diameter and big length requirements. We can produce both hot rolled and cold rolled interlocks for steel pipes. We can weld at our factory or clients can also choose to weld at job site. Tubular piles (King Piles) are ideal for use in the formation of a combi wall system.The tubular units feature an interlocking connector system to which double sheet piles are linked in order to form a continuous high inertia wall. As the King pile provides strength and stability.
Key features：High bending resistance，Suitable for deep water and heavy load conditions，Reliable structural stability，Efficient installation in marine environments.
HZM/ AZ combined walls
The HZM wall is a system incorporating HZM king piles as structural support and double AZ sheet piles as intermediate elements. The Projects organization produces combined piles by making the king piles at the right length and providing them with interlocks. All necessary welding can be done by our team. For hot rolled king piles,we will use RZD16, RZU16, RH16, RZD18, RZU18, RH20 connectors. For welded king piles, we have cold rolled connects to weld on. The intermediate sheet piles have only an earth-retaining and load-transfer function and therefore may be shorter than the HZM primary piles.
Key features：High structural efficiency，Strong load-bearing capacity，Optimized material usage，Suitable for large infrastructure projects.
Integrated Applications for Combined Wall Systems
Strong Retaining Solutions for Complex Engineering Environments
Port & Harbor Infrastructure
Used in quay walls, berths, and terminal structures where strong retaining capacity and long-term stability are essential.
Cofferdam Construction
Forms secure temporary retaining walls for bridge foundations, marine works, and other projects requiring dry construction conditions.
Excavation & Foundation Support
Supports deep excavations, underground works, and foundation construction in projects with high structural demands.
Riverbank & Coastal Reinforcement
Improves slope stability and erosion resistance in river training, flood control, and coastal protection projects.
Product Categories
Tubular Combined Wall
The king piles are steel pipes,normally are spiral welded steel pipes do to big diameter and big length requirements. We can produce both hot rolled and cold rolled interlocks for steel pipes. We can weld at our factory or clients can also choose to weld at job site. Tubular piles (King Piles) are ideal for use in the formation of a combi wall system.The tubular units feature an interlocking connector system to which double sheet piles are linked in order to form a continuous high inertia wall. As the King pile provides strength and stability.
Key features：High bending resistance，Suitable for deep water and heavy load conditions，Reliable structural stability，Efficient installation in marine environments.
HZM/ AZ combined walls
The HZM wall is a system incorporating HZM king piles as structural support and double AZ sheet piles as intermediate elements. The Projects organization produces combined piles by making the king piles at the right length and providing them with interlocks. All necessary welding can be done by our team. For hot rolled king piles,we will use RZD16, RZU16, RH16, RZD18, RZU18, RH20 connectors. For welded king piles, we have cold rolled connects to weld on. The intermediate sheet piles have only an earth-retaining and load-transfer function and therefore may be shorter than the HZM primary piles.
Key features：High structural efficiency，Strong load-bearing capacity，Optimized material usage，Suitable for large infrastructure projects.
Integrated Applications for Combined Wall Systems
Strong Retaining Solutions for Complex Engineering Environments
Port & Harbor Infrastructure
Used in quay walls, berths, and terminal structures where strong retaining capacity and long-term stability are essential.
Cofferdam Construction
Forms secure temporary retaining walls for bridge foundations, marine works, and other projects requiring dry construction conditions.
Excavation & Foundation Support
Supports deep excavations, underground works, and foundation construction in projects with high structural demands.
Riverbank & Coastal Reinforcement
Improves slope stability and erosion resistance in river training, flood control, and coastal protection projects.
our services
Why Choose Our ？
Reliable Product Quality
Engineering Project Support
Export Packaging and Logistics
Flexible Customization
Factory Production and Export Supply
Our combined wall components, including steel pipe piles, HZ piles, and sheet piles, are manufactured using advanced production equipment and strict quality control procedures. This ensures reliable structural performance and consistent product quality.With stable production capacity and organized stock management, we are able to support large engineering projects and international supply requirements. All products are prepared with professional export packaging to ensure safe handling and efficient global transportation.
FAQ
1. What is the structural principle of combined wall systems?
Combined wall systems consist of primary load-bearing elements (such as steel pipe piles or HZ king piles) and intermediate sheet piles. The primary piles resist most of the bending moments and axial loads, while the sheet piles act as infill elements to provide continuous soil and water retention.
2. What are the advantages of tubular combined walls compared to sheet pile walls?
Tubular combined walls provide significantly higher bending resistance and load-bearing capacity due to the use of large-diameter pipe piles. They are more suitable for deep water, high retaining heights, and heavy load conditions compared to standard sheet pile walls.
3. How is the spacing between king piles determined?
The spacing between king piles (center-to-center distance) is determined based on structural design requirements, including bending moment, soil conditions, water pressure, and project loading conditions. Engineering calculations are typically required to optimize spacing.
4. What types of interlock systems are used in combined walls?
Combined wall systems use specialized interlock connections to connect sheet piles to king piles. These interlocks ensure proper load transfer, structural continuity, and water tightness, which are critical for marine and excavation applications.
5. What corrosion protection methods are applied to combined wall systems?
Common corrosion protection methods include coating systems (epoxy or marine coatings), cathodic protection, and the use of corrosion-resistant steel grades. The protection method is selected based on environmental conditions and design service life.
6. What factors should be considered when selecting a combined wall system?
Key factors include soil conditions, water depth, required retaining height, structural load, corrosion environment, and project service life. Proper system selection requires coordination between structural design and construction requirements.
7. What standards are commonly used for combined wall systems?
Combined wall systems are typically designed and manufactured in accordance with international standards such as EN 10248, ASTM A690, ASTM A252, and relevant Eurocode or local design codes. The selection of standards depends on project location and engineering requirements.
8. What is the expected service life of a combined wall system?
The service life of a combined wall system depends on factors such as steel grade, environmental conditions, corrosion protection methods, and maintenance. With proper design and protection measures, the service life can typically range from 25 to 50 years or more in marine and infrastructure applications.
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