Our Z-profile steel sheet piles are the efficient interlocking section for deep and high-water retaining works: the Z profile places its interlocks at the extreme ends of the wall, away from the neutral axis, so a higher proportion of the load is carried into the soil and the section reaches a higher moment of inertia and section modulus than a U pile of similar steel weight. Because they are delivered as singles or welded/crimped pairs, the wall builds with a wider system and fewer interlocks per metre - better water tightness and faster driving.
Sourced in hot-rolled and cold-rolled forms, S235–S460 / SY295–SY390 per EN 10248, JIS A 5528/A 5523 or ASTM A328, every bar is verified against its section chart and shipped with a mill test certificate plus third-party inspection on request. We engineer lengths, grades and pair configurations to your bar drawing and retain the plan, backed by one-stop steel supply, cutting, pair welding, inspection and sea-freight loading - quoted within 24 hours.
Engineering Performance & Design Notes
This section explains how a Z profile resists earth and water pressure and how its end-located interlock is checked, so you can specify it with confidence.
End-located interlocks (off neutral axis) - with the joint at the extreme wall ends, up to roughly 50% more of the load is transferred to the surrounding soil, cutting the steel needed per metre of wall.
High section modulus & moment of inertia - the Z shape delivers a higher modulus than a U of similar weight, giving stiffer walls and less displacement under deep water and soil pressure.
Weight efficiency - for an equal section modulus the weight per m² is lower than a U pile, reducing steel cost and transport on large jobs.
Fully customizable cross-section - width, height and thickness are tailored to the design bar, with steel grade S235–S460 / SY295–SY390.
Design standards - walls are engineered to your regional code (deep-wall tie-back or cantilever); section properties follow the mill's standard bar chart.
Applicable design standards: EN 10248 · JIS A 5528 / A 5523 · ASTM A328/A328M for the pile; wall design per the project's local code.
Overall Specifications
| Item | Range / Detail |
|---|---|
| Section | Z profile, interlocks at wall ends (off neutral axis) |
| Process | Hot-rolled (EN 10248) or cold-rolled 3–16 mm; thickness to 16 mm+ |
| Steel grade | S235–S460GP, SY295/SY390, ASTM A328-equivalent (chemistry on MTC) |
| Dimensions | Width 580–900 mm, height 200–580 mm; length 6/9/12/15/18 m and longer【待工程核实】 |
| Supply form | Single bars or welded/crimped pairs |
| Water tightness | Fewer interlocks per metre; sealant or weld at joints per project |
| Surface | Mill-rolled; cut/drilled/welded in shop; painting or galvanizing on request |
| Quality | MTC + section-chart check; third-party SGS/BV/COTECNA on request |
| Packing / transport | Bundles, welded pairs or bulk-vessel for sea freight |
Core Advantages of Z-Profile Steel Sheet Pile
Efficient deep-wall section - the Z interlock sits off the neutral axis, transferring up to roughly 50% more load to the soil and achieving a higher modulus with less steel than a U pile.
Better water tightness per metre - supplied or built as welded/crimped pairs, the wall has fewer interlocks per metre, reducing leakage risk on water-retaining work.
Lighter per square metre - for an equal section modulus, Z weighs less than U, cutting material and freight cost; the wider bar also speeds up driving time.
Steel grade to match the job - S235 to S460 and SY295/SY390 are available so strength follows the design, not a fixed stock.
Documented, verified supply - every bar arrives with its MTC and a section-chart check, with SGS/BV/COTECNA inspection available - the paper trail port and geotech contractors need.
Applications of Z-Profile Steel Sheet Pile
Permanent works - deep foundation enclosure, permanent dock and quay bulkheads, coastal breakwaters, flood-dike renovation, large underground utility tunnels and lock/wier walls.
Temporary works - cofferdams for bridge piers and abutments, excavation support on building sites, canal and quay-wall temporary walls, land reclamation containment and tunnel construction.
Deep excavation & cofferdams - the high-modulus Z carries the bending of deep drained and water-retaining pits.
Port & coastal works - quay walls, jetties, breakwaters and sea walls where both strength and low leakage matter.
Flood & water management - flood dikes, river diversion, water-treatment fences and protective embankments.
Combi-wall / HZ systems - Z bars used as infill between tubular or H-beam king piles for very high moment resistance.
Technical Parameters
Representative hot-rolled Z sections at 700 mm width. All dimensions can be customized to your project.
| Section | Width (mm) | Height (mm) | Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|
| ZP 12 | 700 | 314 | 8.5 | 67.7 |
| ZP 18 | 700 | 418 | 9.1 | 76.9 |
| ZP 20 | 700 | 421 | 10.0 | 83.5 |
| ZP 24 | 700 | 459 | 11.2 | 95.7 |
| ZP 28 | 700 | 461 | 13.2 | 110.0 |
| ZP 36 | 700 | 499 | 15.0 | 118.6 |
| ZP 38 | 700 | 500 | 16.0 | 126.4 |
* Table is representative. Supply the exact section name, section modulus and weight per your engineering program.
Series Selection - Z vs U & Section Referenc
This table helps you match a Z section to your design modulus; the values are industry-typical references to confirm against the actual mill deliverable.
| Series | Width / Height / Web (mm) | Wall | Section modulus (cm³/m) | Typical use |
|---|---|---|---|---|
| Medium Z (e.g. JZ17–20 / GPZ 8–10) | 700×420×8.5–10 / 850×255–320 | 104–146 kg/m² | 1731–2000 | Medium retaining & cofferdam walls |
| Heavy Z (JZ24–28 / GPZ 16–20) | 700×439–461 / 800×449–475 | 136–157 kg/m² | 2432–2800 | Deep excavation & quay walls |
| Extra-heavy Z (JZ38–40 / GPZ 36–50) | 700×500–550 / 580×540–580 | 179–253 kg/m² | 3600–5050 | Very deep walls, coastal & combi-walls |
| Supply form | Single bars, or welded/crimped pairs for wider system & fewer interlocks | Faster, tighter walls | ||
Manufacturing & Quality Control
Production Flow
Mill hot/cold rolling - Z profile produced on the mill line (partnered steel mill) to the bar drawing.
Incoming verification - MTC chemistry/mechanicals and section dimensions checked on receipt.
Shop processing (as ordered) - cutting to length, drilling lifting holes and pair welding with a matching-joint fixture.
Surface & protection - mill finish standard; painting or galvanizing applied/scheduled where specified.
Third-party inspection - SGS/BV/COTECNA on request with a section-chart and interlock check.
Export packing - singles, welded pairs or bulk-vessel loading for sea freight.
Quality Control
Mill-to-bar traceability - every bundle matches its MTC chemistry and mechanicals.
Section & interlock check - width/height/thickness and interlock geometry versus the bar drawing before release.
Welded-pair integrity - pair weld soundness verified for welded doubles before packing.
Independent verification - third-party SGS/BV/COTECNA reports available to match port and geotech acceptance.
Packing & Transportation
| Item | Detail |
|---|---|
| Packing | Singles or welded pairs bundled with lifting holes, edges and interlock protected. |
| Transport | Open-top container, flat rack or bulk vessel engineered for long lengths. |
| Lead time | Stock 2–5 days; mill order 7–15 days. |
| Marking | Section, steel grade, length and bundle mark per the bar drawing. |
| Docs shipped | Packing list, invoice, MTC, inspection reports and section chart. |
FAQ:
Why choose Z-type over U-type steel sheet piles?
The Z interlocks sit at the extreme wall ends, away from the neutral axis, so up to roughly 50% more of the load is transferred to the soil and the section reaches a higher modulus than a U pile of similar steel weight - more efficient for deep and high-water retaining walls.
What steel grades and standards are available?
S235 to S460 and SY295/SY390 are typical, supplied to EN 10248, JIS A 5528 / A 5523 or ASTM A328 / A328M; section-specific chemistry is provided with the MTC.
Are the piles delivered single or as welded pairs?
Both forms are available. Welded or crimped pairs give a wider system and fewer interlocks per metre, which improves water tightness and speeds up installation.
How are very long Z piles transported?
Long piles are arranged in bundles or welded pairs for open-top container, flat-rack or bulk-vessel loading with lifting holes and edge protection; lengths above 18 m are engineered for sea freight.
What quality documentation is supplied?
A mill test certificate (MTC) with chemistry and mechanicals, and third-party inspection by SGS/BV/COTECNA on request, is provided with each shipment; interlocks are checked against the bar drawing.
