Hydraulic steel structures supplier: lock gates, weir flaps & dolphins
As a supplier of hydraulic steel structures we manufacture heavy welded assemblies to drawing — lock gates, weir and fish-belly flap gates, dolphins — to DIN EN 1090-2 EXC3, blasted and coated to EN ISO 12944 in Lorch in the Stuttgart region.
Lock gates, weir and fish-belly flap gates, sluice gates and dolphins — heavily welded to your drawing.
Blasting to cleanliness grade Sa 2.5 and coating to EN ISO 12944 in the 25 × 7 × 6 m plant.
Heavy, long components up to 50 t part weight and 26 m in length — handled by the crane system with 25 t.
Load-bearing welded structures to the highest class certified in practice — plus EN ISO 3834-2.
VT, PT and MT by our own inspection personnel with Level 2 to DIN EN ISO 9712 — directly in production. UT at our plant by our cooperation partner.
Supplier for hydraulic steel structures
Hydraulic steel structures to drawing — at Bock Maschinenbau that has meant heavy welded steel fabrication for structures in and beside water since 1963. Lock gates, weir flaps and dolphins carry high hydrostatic and dynamic loads and have to stay tight, dimensionally accurate and corrosion-resistant for decades. As a certified welding contractor we build every assembly for load capacity, tightness and fatigue strength.
The manufacturing depth for this is entirely in Lorch in the Stuttgart region. From flame cutting on the 20 × 3.5 m table up to 200 mm material thickness through SAW and MAG welding to CNC large-part machining, blasting and coating, everything is produced under one roof. That shortens lead times, avoids transports between trades and secures complete material traceability to EN 10204.
We work as a contract manufacturer to your specifications — from the single closure element to the complete gate assembly. On 14,000 m² of production space over 100 specialists work with 63 years of experience in heavy steel fabrication.
Typical components for hydraulic steel structures
Whether a new impoundment structure or the replacement of individual closure elements — we manufacture to drawing and customer specification:
- Lock gates and lock construction assemblies for canals, ports and waterways — welded gate bodies with machined connection and sealing faces
- Lock sluice gates and slide gates — closure elements for water regulation, welded to size and machined
- Fish-belly flap gates as well as weir and impoundment flaps for barrage structures — torsionally stiff hollow bodies with long, tight welds
- Dolphins — welded dolphin structures for ports and berths, built for impact and berthing loads
- Impoundment structure components and load-bearing frame structures to drawing — from the embedded frame to the complete assembly
We manufacture further components for hydraulic steel structures to drawing on request — send us your documents.
Materials for hydraulic steel structures
For load-bearing structures in water engineering we process structural steel S235/S355 and fine-grain structural steel up to S1100 — for weight-optimised gates and flaps with a high yield strength. Where increased corrosion resistance is required, we manufacture from stainless steel 1.4301 to 1.4571 and duplex 1.4462. Over 40 material grades are available in total, common qualities from stock.
Every batch is completely marked and documented with a 3.1 mill certificate to EN 10204. For the re-stamping of remnant material we are authorised by GSI SLV München — traceability stays closed from goods receipt to the finished assembly.
Corrosion protection to EN ISO 12944 — blasting and coating in-house
Components in hydraulic steel structures are permanently exposed to water, moisture and alternating loads — corrosion protection determines their service life. We blast gates, flaps and dolphins in the 25 × 7 × 6 m shot blasting plant to cleanliness grade Sa 2.5 and then coat them to EN ISO 12944 — for high corrosivity categories and long protection durability.
Because welding, machining, blasting and coating take place in the same works, there are no intermediate transports and no coatings damaged by outside handling. You receive the assembly ready to install with a documented coating system.
Industrial painting to EN ISO 12944
Quality & inspection in hydraulic steel structures
Lock gates and weir closures are load-bearing welded structures under permanent alternating load — we manufacture them to DIN EN 1090-2 EXC3, the highest execution class certified in practice, and with EN ISO 3834-2 we meet the comprehensive quality requirements for welding. Material documentation to EN 10204 is part of the standard.
Non-destructive testing in-house
Welds in water engineering must be tight and fatigue-resistant — we inspect them where they are made:
- Visual testing (VT), dye penetrant testing (PT) and magnetic particle testing (MT) are carried out by our own inspectors with Level 2 to DIN EN ISO 9712 directly in production.
- Ultrasonic testing (UT) is carried out at our plant on a project basis by certified inspection personnel of our cooperation partner. Destructive tests such as tensile tests are commissioned from accredited partner laboratories.
Inspection scope and documentation follow your specification or standard — with inspection reports for every assembly.
Why Bock as your supplier in hydraulic steel structures
- Heavy & large from a single source
- Cutting, welding, CNC large-part machining, blasting and coating in the same works — components up to 50 t and 26 m, handled by the crane system with 25 t.
- Corrosion protection in-house
- Blasting to Sa 2.5 and coating to EN ISO 12944 in the 25 × 7 × 6 m plant — without intermediate transport to a coating contractor.
- Certified & traceable
- DIN EN 1090-2 EXC3, EN ISO 3834-2, 3.1 mill certificate and complete material marking to EN 10204 — re-stamping authorised by GSI SLV München.
- Inspection expertise in-house
- VT, PT and MT with Level 2 to DIN EN ISO 9712 by our own personnel, UT at our plant by our cooperation partner — short distances between weld and inspection report.
- Experience since 1963
- 63 years of heavy steel fabrication, over 100 specialists and 14,000 m² of production space in Lorch in the Stuttgart region.
Frequently asked questions — hydraulic steel structures
Does Bock manufacture lock gates and dolphins to drawing?
Yes. We manufacture lock gates, weir and impoundment flaps, fish-belly flap gates, sluice gates and dolphins to your drawing — heavily welded to DIN EN 1090-2 EXC3, machined and corrosion-protected to EN ISO 12944.
How does Bock protect hydraulic steel components against corrosion?
We blast the components in the 25 × 7 × 6 m plant to cleanliness grade Sa 2.5 and then coat them to EN ISO 12944 — for high corrosivity categories and permanent use in and beside water. Blasting and coating take place in the same works as the welding.
Up to what size and weight do you manufacture?
Up to 50 t part weight and 26 m component length. Heavy gate bodies and flaps are handled by the crane system with 25 t; flame-cut blanks are possible on the 20 × 3.5 m table up to 200 mm material thickness.
Which materials does Bock process for hydraulic steel structures?
Structural steel S235/S355, fine-grain structural steel up to S1100, stainless steel 1.4301 to 1.4571 and duplex 1.4462 — over 40 material grades in total. On request every delivery receives a 3.1 mill certificate to EN 10204 with complete traceability.
How are welds in hydraulic steel structures inspected and documented?
Visual, dye penetrant and magnetic particle testing (VT, PT, MT) are carried out in-house by our own inspectors with Level 2 to DIN EN ISO 9712; ultrasonic testing (UT) is carried out at our plant by our cooperation partner. Inspection scope and reports follow your specification — we supply the documentation with the assembly.
For which regions does Bock work as a supplier of hydraulic steel structures?
Manufacturing takes place in Lorch in the Stuttgart region; we supply clients in hydraulic steel structures throughout Germany and the DACH region. Send us your enquiry — drawing review and quotation are without obligation.
Request components for hydraulic steel structures
Send us your drawings — we will assess the manufacture of heavy hydraulic steel assemblies including machining and corrosion protection to EN ISO 12944 and provide a no-obligation quote.
Certified to DIN EN 1090-2 EXC3 · 3.1 mill certificate to EN 10204.