Our U-section steel sheet piles form a continuously interlocked, water-retaining wall for cofferdams, deep foundation-pit support, river bank protection and hydraulic works such as quay and flood-defense structures. The C-offset interlock chains each bar into the next, holding a stable section profile even under hard driving and unbalanced earth pressure, and the moderate self-weight lets site crews drive by vibratory hammer for fast, economical installation.
We supply hot-rolled U piles in a broad standard matrix - 400 to 750 mm wide, 6 to 25 mm thick, grades from S275 to S430 and SY295/SY390, covering Type 2, Type 3 and Type 4 sections - to EN 10248, JIS A 5528 & 5523 and ASTM A328. Every bundle ships with an MTC and can be third-party inspected, and we cut, coat, mark and pack to your site needs, quoting within 24 hours.
U-Section Steel Sheet Pile Specification
| Item | Range / Detail |
|---|---|
| Section | U-shaped, single interlock |
| Technique | Hot-rolled & cold-bend |
| Grades | S275 / S355 / S390 / S430; SY295 / SY390 / SY490; Grade 50 / 55 / 60 / A690 (chemistry on MTC) |
| Width / height / thickness | 400–750 mm; height 85–210 mm; thickness 6–25 mm |
| Length | 6 / 9 / 12 / 18 m, longer on request |
| Surface | Bare · black (varnish) · hot-dip galvanized |
| Standard | EN 10248 · EN 10249 · JIS A 5528 & 5523 · ASTM A328 / A328M |
| Water tightness | Single interlock; groove sealant / joint welding for low-permeability walls |
| Quality | MTC; third-party SGS/BV/COTECNA on request; ±1% dimensional tolerance |
| Packing / transport | Bundled with steel strips, container / bulk vessel, sea-worthy packing |
Engineering Performance & Design Notes
This section explains how the U-section resists earth and water pressure and how its interlock and section are verified, so you can specify it with confidence. The U profile works with a single interlock that transfers shear through the wall while the closed sheeting keeps water and soil out; it is the conventional, well-documented section class for medium head and pit works.
Watertight single interlock - hot-rolled interlock closes tightly, preventing soil leakage and water seepage in cofferdam and pit walls.
Section stability under driving - the U profile holds shape under impact and vibratory driving in stiff ground.
Multi-standard traceability - supplied to EN 10248 / JIS A 5528 & 5523 / ASTM A328 with MTC per selected standard.
Reusable temporary walls - bars pull out and re-drive on the next wall, cutting material spend over the project.
Applicable design standards - pile per EN 10248 / JIS A 5528 / ASTM A328; wall design per the project's local code.
Core Advantages & Applications
Core Advantages
Reliable water sealing - the interlocking lock structure prevents soil leakage and water seepage efficiently across the wall run.
Fast, light installation - moderate self-weight enables quick piling by vibratory hammer, saving construction time and crane size.
Recyclable economy - extractable and reusable after completion, cutting overall project expense on temporary works.
Wide standard matrix - 400–750 mm bars, 6–25 mm thick and Type 2/3/4 tiers, so the right section is typically a stock item.
Flexible & corrosion options - available for straight or curved layouts with bare, black or galvanized finishes for inland and waterfront duty.
Applications
Retaining & water control - deep foundation-pit support, cofferdams, quay walls, river bank protection, flood defense and environmental isolation barriers, recharge/groundwater wells and temporary support structures.
Hydraulic works - the interlocking seal makes U piles the preferred choice for cofferdams, quay walls and levees where a tight water barrier is required with minimal soil disturbance.
Cofferdams & deep pits - continuous interlocked retaining that de-waters the excavation for bridge piers and basements.
River bank protection & flood defense - erosion control, recharge wells and levee barrier walls.
Quay works & temporary support - dock retaining and reusable support walls in medium-head conditions.
U-Section Steel Sheet Pile SectionSize
Standard U-section sheet-pile sizes (single-bar section area and mass), cross-checked against the standard steel sheet pile bar chart. Confirm exact mass and section properties against the supplied mill chart.
| Specification (W×H×t mm) | Width (mm) | Height (mm) | Thickness (mm) | Section area (cm²) | Mass (kg/m) |
|---|---|---|---|---|---|
| 400 × 85 | 400 | 85 | 8.0 | 45.21 | 35.5 |
| 400 × 100 | 400 | 100 | 10.5 | 61.18 | 48.0 |
| 400 × 125 | 400 | 125 | 13.0 | 76.42 | 60.0 |
| 400 × 150 | 400 | 150 | 13.1 | 74.40 | 58.4 |
| 400 × 170 | 400 | 170 | 15.5 | 96.99 | 76.1 |
| 600 × 130 | 600 | 130 | 10.3 | 78.7 | 61.8 |
| 600 × 180 | 600 | 180 | 13.4 | 103.9 | 81.6 |
| 600 × 210 | 600 | 210 | 18.0 | 135.3 | 106.2 |
| 750 × 205 | 750 | 204–206 | 10.0–12.0 | 99.2–113.4 | 77.9–89.0 |
| Grades: S275 · S355 · S390 · S430 ｜ SY295 · SY390 · SY490 ｜ Grade 50 · 55 · 60 · A690 | Type 2 / Type 3 / Type 4 market tiers | Hot-rolled & cold-bend | Surface: bare · black (varnish) · galvanized | |||||
Manufacturing & Quality Control
Production Flow
Mill hot rolling - U profile rolled on the steel mill line (partnered mill) to the bar chart and selected standard.
Incoming verification - MTC chemistry/mechanics and section data checked on receipt.
Shop processing - cutting to length, lifting/handling holes and surface prep as ordered.
Surface & protection - bare, black (varnish) or hot-dip galvanized per project and seawater exposure.
Inspector sign-off - section, mass and dimensional check; third-party SGS/BV/COTECNA on request.
Export packing - oil-free, length-marked bundles steel-strapped for container/bulk loading.
Quality Control
Mill-to-bar traceability - every bundle matches its MTC chemistry and mechanics.
Section & tolerance check - width/height/thickness held to standard tolerance (≈±1%) before release.
Interlock & finish inspection - lock profile and coating verified; oil-free, marked, no damage/no bent.
Independent verification - third-party SGS/BV/COTECNA available for port and geotech acceptance.
Packing & Transportation
| Item | Detail |
|---|---|
| Packing | Oil-free, length-marked bundles steel-strapped with lifting points protected. |
| Transport | Container, bulk vessel or open-top, engineered for bar length. |
| Lead time | Stock 5–10 days; mill order 15–20 days. |
| Marking | Section, grade, length and bundle mark per the bar drawing. |
| Docs shipped | Packing list, invoice, MTC, inspection (third-party on request). |
FAQ:
What do Type 2 / Type 3 / Type 4 U-section sheet piles mean?
They are market naming tiers by section size and wall modulus: Type 2 covers the lighter 400×85–100 bars, Type 3 the 400×125–170 range, and Type 4 the heavier 500–600 and 750 wide sections for higher water head and deeper walls.
Does the single interlock make a continuously watertight wall?
Yes for low-leakage cofferdam duty in normal ground: the hot-rolled interlock closes tighter than cold-formed, and the U-section interlocks chain bars into a continuous water-retaining wall. For low-permeability marine walls we add groove sealant or joint welding.
Hot-rolled versus cold-formed U piles - which should I choose?
Hot-rolled gives a tighter, more consistent interlock for hard driving and low-permeability walls; cold-formed offers flexibility for light and standard sections. Confirm driving condition and water tightness to select.
What dimensional tolerance and inspection do you follow?
Dimensions are held to standard tolerance (about ±1% on section); each bundle ships with MTC, oil-free and length-marked, and can be checked by a third party before shipment.
Can I mix the pre-defined sizes or custom-cut lengths?
Yes - the bar sizes are from the standard matrix and can be custom cut to 6/9/12/18 m or mixed per delivery; lifting holes and custom painting/galvanizing can be added.
