Tank mill assembly (2018)

Client: Yara Finland Ltd
Project: Manufacture of a rod mill

The rod mill used at Yara’s factory had been in service since 1979. In 2017, it was decided to purchase a new mill, and the assembly and replacement work was carried out in 2018. The new rod mill is expected to serve mining operations for the next 30 years.

The assembly of the rod mill frame included:

• Installation of wear plates
• Tightening of hundreds of bolts
• Installation of end piece bearing housings
• Surface treatment: fast-drying, semi-gloss, single-component alkyd paint containing rust-inhibiting pigments, shade RAL1015

Transport and installation:

The 150-ton roller mill was transported from the machine shop to the factory on a 14-axle flatbed truck.

During the replacement, we removed the old mill rollers and installed 800 new rollers, for which we designed and manufactured a special feed track.

The installation work was completed ahead of schedule and the project was a complete success.
This project was a demonstration of efficient implementation and sustainable design, ensuring continuity of production for decades to come.

Client Steel-Kamet Oy
Project: Tilting molds according to the customer’s plans

We manufactured 4.5 x 8 meter tilting molds based on the customer’s plans. During manufacturing, heating pipes were installed in the molds, and the finished molds were surface-treated with quick-drying, flexible polyurethane paint in shade RAL5017 in our paint shop.

Key implementations:

• We manufactured 4.5 x 8 meter tilt molds according to the customer’s plans.
• Heating pipes were installed in the molds.
• The surface treatment was carried out with a quick-drying, flexible polyurethane paint.
• The paint color was RAL5017.
• The surface treatment was carried out in our paint shop, ensuring high quality and durability.

Client: Yara Suomi Oy
Project: Manufacture of steel structures for the main quarry pumping station

In 2017, an underground pumping station was built in Yara Suomi Oy’s Siilinjärvi mining area to keep the main quarry dry.

We participated in the project by manufacturing and installing steel structures. We supplied platforms, stairs, maintenance platforms for settling basins, ladders, the steel frame for the electrical room and transformer, and a support system for the tunnel.

Acid-resistant steel was used as the material, and the finished products were surface-treated in our paint shop.

Client: Metsä Board
Project: Internal chimney for the Husum mill

Metsä Board Oyj is investing in the renovation of its Husum paperboard and pulp mill in Sweden during the 2020s. The first phase (2019–2022) involved modernizing the pulp mill, which included upgrading the evaporator and installing a new recovery boiler and turbine.

As part of this renovation, we manufactured an acid-resistant (1.4432) internal pipe for the Husum mill.

The delivery included:

• 6 sections (13 m long) and 2 sections (12 m long)
• 100 mm insulation and shrink wrapping for protection during transport and storage

High-quality workmanship and durable materials ensure the inner pipe’s long service life and efficiency in demanding process conditions.

Customer: Yara Finland Ltd
Project: New steel structures for sulfuric acid production in 2024–2025

Yara has invested €235 million over five years in the renovation of its sulfuric acid production facility in Siilinjärvi. The aim of the project is to improve the reliability of the production process and enhance heat recovery, which will increase the plant’s energy efficiency and operational reliability.

Rakenneasennus carried out an extensive pipe bridge project, which included the design, manufacture, and installation of the pipe bridge and auxiliary structures.

We manufactured and installed steel structures such as:

• Pipe bridge frames and supports
• Pump bed
• 15 painted steel pipe bridge frames

A total of 280 tons of steel was used in the project. We carried out the work in close cooperation with other parties, ensuring that the structures met high quality and safety requirements and supported the objectives of the renovation.

Client: Rakennustoimisto K. Tervo Oy
Project: Psychiatric building on the campus of Kuopio University Hospital.

A new psychiatric building was constructed on the campus of Kuopio University Hospital between 2022 and 2024. The aim of the project was to centralize the mental health services of the Kuopio region in one building, improving the availability and smoothness of care. The construction project was part of the larger KYS Uudistuu project, which aims to modernize the university hospital’s facilities.

Rakenneasennus acted as a subcontractor for Rakennustoimisto K. Tervo Oy, responsible for several demanding steel construction tasks. The work included, among other things:

• Manufacture, surface treatment, and installation of steel structures for the tunnel
• Flame cutting of tower crane anchors
• Welding of elements
• Installation of steel structures for the fresh air chamber, treatment levels, stairwell and roof terrace
• Manufacture and installation of steel levels for connecting columns and IV shafts
• Manufacture, surface treatment and installation of eaves supports and support structures for long-distance cooling pipes
• Maintenance platforms on the roof around the Retermia heat recovery system, including dimensioning, design, manufacture, and installation

We carried out the project in close cooperation with the main contractor and other parties, ensuring high-quality construction that progressed on schedule.

Client: Valio Suonenjoki factory
Project: Renovation of production facilities and renewal of pre-processing

Rakenneasennus carried out a large-scale steel structure project at Valio’s Suonenjoki factory as part of the renovation of production facilities and renewal of pre-processing. Rakennusliike Konttinen Oy acted as the main contractor on the site.

The contract included extensive steel construction work, such as the manufacture, installation, and surface treatment of new structures, ensuring that the renovated facilities meet modern production requirements.

The contract included, among other things:

• Hot-dip galvanized steel stairs
• Hot-dip galvanized platforms
• Exterior wall frames
• IV machine bases
• Stainless steel partition walls and fire door frames
• Stainless steel stairs and platforms
• Stainless steel lifting beams
• A special feature was the stainless steel pillars made of RHS 250x250x6 profiles, which were manufactured by laser welding two chamfered U-profiles, as such a large profile was not available from steel mills.

Client: Nyab Finland Oy
Project: Manufacture and installation of steel structures for a sulfur storage facility and melting building in 2023–2024

We manufactured steel frames for a sulfur storage facility and melting building at the Yara factory in Siilinjärvi. The project included a wide range of steel structures, which were manufactured in accordance with precise requirements.

Key implementations:

• Versatile steel structures – We manufactured steel frames, railings, flat grates, LP beam and roof connection parts, trusses, roof structures, door frames, pipe supports, stair towers, and roof hatches, among other things.
• High-quality materials – We used HST steel, which guarantees the durability and longevity of the structures.
• Surface treatment – The steel was hot-dip galvanized and painted before delivery to ensure the longevity and weather resistance of the structures.
• Weather-resistant finish – The structures were painted with a special hard-drying, two-component, quick-drying epoxy primer in RAL7040.
• Safety testing – The steel was NDT tested to ensure quality before delivery.

  We carried out the project with great care, ensuring that all structures met the requirements of the industrial environment.

Client: Finnish Transport Agency
Project: Steel parts for Kemi radar markers

We manufactured steel parts for Kemi radar markers on behalf of the Finnish Transport Agency.

Our delivery included:

• Cross supports
• Telescopic tubes
• Foundation piles
• Ice cones
• Hot-dip galvanized rails
• Threshold supports
• Ladders

Hot-dip galvanized RHS steel was used as the material, and the parts were painted with a two-component, polyamine-cured epoxy paint suitable for underwater use in shades #MKLWHITE, #MKLRED, and HB beige + white. The steel was NDT tested in accordance with standards before delivery to the customer.