In heavy civil engineering, maritime logistics infrastructure, and deep foundation excavations, the term "Schpunt Larsen Zizhu Spu Vil" represents the pinnacle of high-strength structural steel sheet piling. Drawn from European terminology ("Schpunt" or "Шпунт" representing locking steel sheets) and utilizing the world-famous Larsen interlocking design, these profiles are designed for continuous retaining structures. Major engineering firms globally rely on Chinese manufacturers to produce hot-rolled and cold-formed Larsen-type piles that meet Zizhu technical criteria, integrating deep structural stability with cost efficiency.
The engineering profile is designed to provide high resistance to lateral pressures in marine environments, riverbank restorations, and bridge abutments. As a leading hub of manufacturing, Tianjin Minjie Steel Co., Ltd. supplies foundational steel products globally, applying patents and specialized processes to deliver structural profiles optimized for the toughest subsoil environments.
| Profile Type / Spec | Section Modulus (cm³/m) | Moment of Inertia (cm⁴/m) | Standard Grades | Recommended Application Scenario |
|---|---|---|---|---|
| Type II / Larsen U-Type | 870 - 1,020 | 7,400 - 8,600 | SY295, Q235B, Q345B | Temporary Cofferdams & Shallow Excavation Support |
| Type III / Larsen U-Type | 1,340 - 1,600 | 16,800 - 22,000 | SY390, Q345B, Q420 | Deep Basements, River Embankments, Canal Locks |
| Type IV / High-Yield Larsen | 2,000 - 2,270 | 32,000 - 38,000 | SY390, ASTM A572 Gr. 50 | Maritime Ports, Bridge Abutments, Heavy Foundations |
| Z-Type Custom Sheet Pile | 1,800 - 2,800 | 28,000 - 45,000 | Q355B, S355GP, S430GP | Deep Water Terminals, Seismic Zone Retention Walls |
Established in 1998, Tianjin Minjie Steel Co., Ltd. has grown to become an international supplier of high-quality structural steel products. Our massive modern factory covers an area of more than 70,000 square meters, strategically located just 40 kilometers from Xingang Port, the largest port in Northern China. This proximity enables fast, cost-effective logistical routing to all major global transport channels, ensuring timely delivery to engineering project sites.
With an annual output of various structural pipes, steel sheet piles, and scaffolding products exceeding 300,000 tons, the factory operates with a clear commitment to precision manufacturing. Equipped with four pre-galvanized product lines, eight ERW steel pipe lines, and three hot-dipped galvanized processing lines, our facilities meet international standards including GB, ASTM, DIN, and JIS.
Direct supply agreements with major domestic steel mills ensure consistent access to structural carbon and high-strength low-alloy steel. This vertical integration buffers clients from global steel market volatility.
Our facilities utilize advanced rolling processes to manage profile thickness tolerances, maintain flange dimensions, and deliver durable interlocking clutches that resist deformation during driving.
Equipped with hot-dipped zinc lines, Tianjin Minjie delivers comprehensive corrosion protection. The resulting coatings shield structural steel against brackish water, chemical soils, and long-term weathering.
Our solutions have been verified on project sites across the globe. Backed by professional technical advisers and experienced production teams, we supply structural profiles tailored to the design demands of civil engineering and maritime projects worldwide.
Visited clients in September 2019 to inspect piling layouts and coordinate logistics, confirming compliance with local construction and site standards.
Collaborated with Korean engineers in 2019 to manufacture custom structural profiles matched to localized seismic load specifications.
Long-term Australian client visited our factory in November 2018 to audit steel production lines against AS/NZS structural standards.
Secured regular delivery agreements of 10 containers monthly following a comprehensive 2019 factory tour and facility audit.
Supplied a 1,000-ton order of structural steel profiles to Lebanon in June 2017 for port and municipal development projects.
Partnered with Saudi buyers at the Canton Fair in 2018, leading to a long-term supply agreement for regional infrastructure projects.
Tianjin Minjie Steel maintains a comprehensive quality management system certified under ISO 9001. We hold three specialized product patents covering groove pipe, shoulder pipe, and victaulic pipe configurations. Our internal laboratory tests raw steel materials for chemical compositions and mechanical properties to verify that output meets international standards.
Tianjin Minjie Steel exhibits annually at the Canton Fair. These events provide opportunities to connect directly with global partners, showcase our patented designs, and coordinate site audits. Up to 80% of our new clients schedule visits to our Tianjin factory following the exhibition to evaluate our production lines.
Our steel coils, square tubes, and angle bars are manufactured from selected structural steels, providing reliable performance in marine engineering and civil construction.
Hot dipped galvanized, pre-painted (PPGI), and color-coated steel strip coils.
Hot-dipped, pre-galvanized, and zinc-aluminum-magnesium alloy pipes.
Structural square, rectangular, and round cold-formed steel tubes.
Equal angle bars, channel profiles, and custom hot-rolled shapes.
When engineering a earth-retaining wall using Larsen type sheet piling, structural designers evaluate the section modulus per meter of wall length, represented mathematically as W. The bending moment resistance is directly proportional to this index. For deep excavations near structures, hot-rolled piles are preferred due to their robust interlocks, which transmit shear forces across the neutral axis with minimal yield.
Cold-formed sheet piles are commonly used in intermediate load scenarios, such as river bank lining and shallow trench support. They provide a cost-effective alternative for projects with moderate earth load distributions. Applying structural steel sheet piles requires proper consideration of soil density, hydrologic conditions, and the choice of driving equipment—typically vibratory hammers or hydraulic press-in systems.
To prevent groundwater migration through the wall, locks can be treated with elastomeric sealants or hot-poured bituminous compounds prior to driving.
For maritime environments, hot-dip galvanizing, coal tar epoxy coatings, or cathodic protection systems are applied to extend the service life of the steel structure.
For deeper excavations, the retaining wall is supported by horizontal waling beams and anchor tie rods secured back into stable ground zones.
Hot-rolled sheet piles are manufactured at high temperatures, producing dense, tight-fitting interlocks (clutches) with high shear resistance, suitable for deep water retention and heavy construction. Cold-formed sheet piles are roll-formed from steel coils at room temperature, offering a lighter, cost-efficient option for shallow retaining walls and dry trenches.
Our manufacturing facilities utilize automated forming rollers and continuous laser inspection systems. This technology checks flange thickness, web height, and lock alignment, ensuring each pile section mates cleanly with the adjacent one during driving.
We supply products in standard Chinese grades (Q235B, Q345B, Q355B), Japanese structural grades (SY295, SY390), European structural grades (S235JR, S355JR, S355GP), and ASTM grades (A36, A572 Grade 50) based on specification requirements.
Located just 40km from Xingang Port, our factory minimizes local transport costs and handling times. This proximity simplifies logistics for bulk and containerized shipping, helping lower the total delivered cost (CIF/FOB).
Yes, we can fabricate custom structural components, pre-welded corner piles, waling assemblies, and tie-rod attachment plates to support specific project design requirements.
We offer hot-dip galvanizing, organic color coatings (PPGI), specialized primers, and anti-corrosive epoxy sealants to protect steel surfaces in marine and acidic soil environments.
Minjie Steel
