What is Larssen Sheet Piles?
AGICO sells almost full dimension range of larssen sheet piles in U type, and Z type and flat web sheet piles manufactured with larssen interlock. Larssen steel sheet piles are a type of U-shaped steel sheet pile. Originating from hot-rolled steel sheet piles in Germany, common sizes include U, II, III, IV, and V. They are named after the interlocking pattern invented by engineer Larssen in the early 20th century.
Larssen sheet piles are produced by hot rolling process, they feature high strength, precise interlocking fit, excellent water-stopping properties, and reusability. As a foundation pit support material, larssen sheet piles are designed in a variety of cross-sectional shapes to meet diverse construction requirements. These interlocking shapes in hot-rolled U-shaped steel sheet piles, are also used in other steel sheet piles, such as Z-shaped and straight-belly models, allowing for flexible combination and deployment based on project needs.
History of Larssen Sheet Piles in China
China has a short history of steel sheet pile production. In 1957, the Ministry of Railways’ Bridge Engineering Bureau imported Larsen steel sheet piles from the former Soviet Union and successfully used them in the construction of underwater pier cofferdams for the Wuhan Yangtze River Bridge. Although steel sheet pile use stagnated in China from the 1960s to the 1990s, it has experienced rapid growth since 2000, driven by the booming infrastructure development in China. Since 2010, its application has expanded dramatically, making it an indispensable material in the construction industry. AGICO has steel mill factory partners can produce larssen sheet piles in wide dimension range of high strength levels, if you are looking for larssen sheet piles suppliers in China, contact us now for latest price!
Larssen Sheet Piles Detail
Larssen Type Sheet Pile Supply Form
Larssen sheet pile is one type of u shape sheet pile, so the supply form is the same, here are the most common forms:
- Single piles: May be subject to bending about the weak axis.
- Double/Triple piles: Typically supplied as side-pressed piles. Threaded double piles are recommended for ease of installation.
- Curved piles: Maximum bending angle 25°, bending in the middle of the web.
Larssen Sheet Pile Material and Test
Larssen sheet piles are supplied in different sections by steel mills in the world, the section dimension can have slightly differences, most of them have alternative models manufactured by other steel mills.
Based on the yield strength of the larssen sheet pile, steel grades of Chinese national standards include Q295P, Q355P, Q390P, Q420P, and Q460P, while grades that meet Japanese standards include SY295 and SY390 (the numbers here represent the yield strength of the steel sheet pile material). In addition to differing chemical compositions, different grades also have different levels of mechanical parameters.
Larssen Sheet Pile Chemical Composition:
| Classification | Grade | Chemical composition(％） | Ceq（％） | |||||
|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | N | Ceq | ||
| Weldable hot rolled steel sheet piles JIS A5523 | SYW295 | 0.18max | 0.55max | 1.50max | 0.04max | 0.04max | 0.006max | 0.44max |
| SYW390 | 0.18max | 0.55max | 1.50max | 0.04max | 0.04max | 0.006max | 0.46max. | |
| hot rolled steel sheet piles JIS A5528 | SY295 | – | – | – | 0.04max | 0.04max | – | – |
| SY390 | – | – | – | 0.04max | 0.04max | – | – | |
Larssen Pile Steel Mechanical Properties Chart
| Classification | Grade | Mechanical Properties | |||
|---|---|---|---|---|---|
| Yield strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) | Charpy V-notch Toughness | ||
| Weldable hot rolled steel sheet piles JIS A5523 | SYW295 | 295min | 490 min | 17 min | 43 min |
| SYW390 | 390 min | 540min | 15min | 43 min | |
| hot rolled steel sheet piles JIS A5528 | SY295 | 295 min | 490min | 17min | |
| SY390 | 390 min | 540min | 15min | ||
Quality Inspection and Test
Larssen sheet piles will go through strict quality inspections and test after the production process and in the pile installation process, here are the 3 most important measures in larssen sheet pile installation:
- Pile verticality control: Use a total station for real-time monitoring. The inclination rate must not exceed 1%.
- Lock connection inspection: Check the lock gap after every 10 piles are driven to prevent water seepage.
- Deformation monitoring: Set up displacement observation points at the top of the support structure. If the daily change exceeds 3mm, activate the emergency plan.
Larssen Steel Sheet Pile Locking Test
Interlock design and quality is the key factor for water-stoping in the earth and water retain projects, here are the 9 tips for interlock quality and state checking:
- According to industry standards, the gap between the interlocking joints must be strictly controlled within no more than 2mm, to ensure sealing effect.
- A straightedge and feeler gauge are often used to check the flatness of the interlocking joints. Adjustments are required if the deviation exceeds 0.5mm.
- The tensile strength of the interlocking joints of Larssen steel sheet piles must generally meet the design requirements, such as no less than 50kN, to ensure a secure connection.
- The interlocking joint dimensions should be measured with a caliper, and the width error should be controlled within ±1mm to avoid affecting the interlocking effect.
- The surface roughness of the lock’s mouth affects its tightness and should meet the standard requirement of Ra6.3.
- During nondestructive testing of the lock’s mouth, ultrasonic testing can accurately detect internal defects such as cracks.
- To observe the lock’s bite force, actual force simulations can be used to determine the bite force’s ability to withstand a lateral pressure of 20 kPa.
- The thickness of the anti-corrosion coating on the lock’s mouth is generally required to be no less than 100 μm to prevent corrosion from affecting the engagement performance in harsh environments.
- Use a torque wrench to check the pre-tightening force of the locking bolts, which should reach the design specified torque value and the deviation should be controlled within ± 5%.
Advantages of Larssen Sheet Piles
- Easy Construction: Steel sheet piles are fast to install, easy to operate, and can quickly form a retaining structure.
Reusability: The material is recyclable, meeting environmental requirements while reducing project costs. - Shortened Construction Time: Due to the fast construction speed, the overall project duration can be significantly reduced.
- Reduced Earthwork Volume: Steel sheet piles effectively support the foundation pit and reduce the amount of earthwork generated by slope adjustment and excavation.
- Strong Combinability: Can be combined with other support methods, such as shaped steel supports, to meet more complex foundation pit support needs.
Larssen Sheet Pile Product For Sale
SP Series Larssen Sheet Pile Specification Chart
Larssen sheet piles in Asia are mostly produced by 2 countries, China and Japan, and most of the section types can be replaced by similar sections produced by other countries, here are the dimention and property chart of standard larssen sheet pile.
| Section | Dimensions | SectionalArea | Mass | Momentof inertia | Modulus of section | |||
|---|---|---|---|---|---|---|---|---|
| Width b | Height h | Thickness t | Pile | Wall | ||||
| mm | mm | mm | cm2/pile | kg/m | kg/m2 | cm4/m | cm3/m | |
| SP I | 400 | 85 | 8 | 45.21 | 35.5 | 88.8 | 4500 | 529 |
| SP II | 400 | 100 | 10.5 | 61.2 | 48 | 120 | 8740 | 874 |
| SP III | 400 | 125 | 13 | 76.4 | 60 | 150 | 16800 | 1340 |
| SP IIIA | 400 | 150 | 13.1 | 74.4 | 58.4 | 146 | 22800 | 1520 |
| SP IV | 400 | 170 | 15.5 | 97 | 76.1 | 190 | 38600 | 2270 |
| SP VL | 500 | 200 | 24.3 | 133.8 | 105 | 210 | 63000 | 3150 |
| SP VIL | 500 | 225 | 27.6 | 153 | 120 | 240 | 86000 | 3820 |
Wide Type Larssen Sheet Piles Specification Chart
Wide-type larssen sheet piles are produced to reduce the amount and cost of steel sheet piling, wide steel sheet piles can decrease the steel weight per unit wall area and increase the section performance per unit steel weight as compared with conventional steel sheet piles. Given the manufacturing limits of existing production facilities, the effective width was set at 600 mm as already adopted for European counterparts. 3 types (II, III, and IV) were selected from among those types that had section properties in greatest demand.
| Section | Dimensions | SectionalArea | Mass | Momentof inertia | Modulusof section | |||
|---|---|---|---|---|---|---|---|---|
| Width b | Height h | Thickness t | Pile | Wall | ||||
| mm | mm | mm | cm2/pile | kg/m | kg/m2 | cm4/m | cm3/m | |
| SP IIW | 600 | 130 | 10.3 | 78.7 | 61.8 | 103 | 13000 | 1000 |
| SP IIIW | 600 | 180 | 13.4 | 104 | 81.6 | 136 | 32400 | 1800 |
| SP IVW | 600 | 210 | 18 | 135.3 | 106 | 177 | 56700 | 2700 |
L Series Larssen Sheet Piles Specification Chart
L Serie larsssen sheet piles are produced according to the European Standard,
| Section | Section Modulus | Width | Weight Single pile Wall | Depth | Back Thickness | Web Thickness | Moment of Inertia | Coating area ‘ | |
|---|---|---|---|---|---|---|---|---|---|
| Wy [cm3/m] | B [mm] | [kg/m] | 【kg/m) | h [mm] | e [mm] | a [mm] | ly [cm4/m] | [m2/m] | |
| L600 | 510 | 600 | 56,4 | 94,0 | 150 | 9.5 | 9.5 | 3.825 | 2,25 |
| L600K | 540 | 600 | 59,4 | 99,0 | 150 | 10,0 | 10,0 | 4.050 | 2,25 |
| L601 | 745 | 600 | 46,8 | 78,0 | 310 | 7,5 | 6,4 | 11.520 | 2,45 |
| L602 | 830 | 600 | 53,4 | 89,0 | 310 | 8,2 | 8,0 | 12.870 | 2,45 |
| L603 | 1.200 | 600 | 64,8 | 108,0 | 310 | 9,7 | 8,2 | 18.600 | 2,60 |
| L603K | 1.240 | 600 | 68,1 | 113,5 | 310 | 10,0 | 9,0 | 19.220 | 2,60 |
| L 603/10/10″) | 1.260 | 600 | 69,6 | 116,0 | 310 | 10,0 | 10,0 | 19.530 | 2,60 |
| L604n | 1.600 | 600 | 73,8 | 123,0 | 380 | 10,0 | 9,0 | 30.400 | 2,82 |
| L605 | 2.020 | 600 | 83,5 | 139,2 | 420 | 12,5 | 9,0 | 42.420 | 2,90 |
| L605K | 2.030 | 600 | 86,7 | 144,5 | 420 | 12,2 | 10,0 | 42.630 | 2,90 |
| L606n | 2.500 | 600 | 94,2 | 157,0 | 435 | 14,4 | 9,2 | 54.375 | 2,92 |
| L606n K | 2.540 | 600 | 97,2 | 162,0 | 435 | 14,6 | 10,0 | 55.250 | 2,92 |
| L628 | 2.775 | 600 | 99,3 | 165,5 | 456 | 16,3 | 9,8 | 63.270 | 3,03 |
| L607n | 3.200 | 600 | 114,0 | 190,0 | 452 | 19,0 | 10,6 | 72.320 | 2,93 |
| L703 | 1.210 | 700 | 67,5 | 96,4 | 400 | 9,5 | 8,0 | 24.200 | 2,51 |
| L703K | 1.300 | 700 | 72,1 | 103,0 | 400 | 10,0 | 9,0 | 25.950 | 2,51 |
| L703/10/10** | 1340 | 700 | 75,6 | 108,0 | 400 | 10,0 | 10,0 | 26.800 | 2,51 |
| L716 | 1.600 | 700 | 79,9 | 114,2 | 440 | 10,2 | 9,5 | 35.200 | 2,68 |
| L720 | 2.000 | 750 | 96,4 | 128,5 | 450 | 12,0 | 10,0 | 45.000 | 2,66 |
| L22 | 1.260 | 500 | 61,8 | 123,6 | 340 | 10,0 | 9,0 | 21.420 | 2,84 |
| L 22/10/10** | 1.300 | 500 | 64,9 | 129,8 | 340 | 10,0 | 10,0 | 22.100 | 2,84 |
| L23 | 2.000 | 500 | 77,5 | 155,0 | 420 | 11,5 | 10,0 | 42.000 | 3,15 |
| L24 | 2.500 | 500 | 87,5 | 175,0 | 420 | 15,6 | 10,0 | 52.500 | 3,15 |
| L24/12 | 2.550 | 500 | 92,7 | 185,4 | 420 | 15,6 | 12,0 | 53.610 | 3,15 |
| L25 | 3.040 | 500 | 103,0 | 206,0 | 420 | 20,0 | 11,5 | 63.840 | 3,15 |
| L43 | 1.660 | 500 | 83,0 | 166,0 | 166 | 12,0 | 12,0 | 34.900 | 2,80 |
| L430 jagged | 6.450 | 750 | 166,0 | 234,5 | 750 | 12,0 | 12,0 | 241.800 | 3,96 |
Larssen Steel Sheet Pile Applications
Larssen sheet piles are a versatile tool from subways to utility corridors, are highly adaptable and commonly used in the following scenarios:
- Urban subway construction: Excavating stations beneath narrow urban roads, their low noise and vibration characteristics minimize impact on surrounding residents.
- Integrated utility corridor projects: As temporary support structures, they can be removed and reused after construction is complete, reducing construction costs.
- River management: In conjunction with internal support systems, they can resist erosion and maintain bank stability.
- Emergency rescue: In the event of foundation pit collapse or piping, rapidly driving steel sheet piles creates a temporary water curtain.
