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Dedicated partner, strongly involved

You can rely on SSAB to provide you with first-rate infrastructure products that are responsibly produced and offer great value for money. To us, partnering with customers means committing to prompt delivery and consulting with you during the design and execution stages as needed.

SSAB’s extensive range of infrastructure construction products consists of steel pipe piles and retaining walls for foundations and harbor structures. The company offers also safety barriers systems, trapezoidal sections for bridge girders, a range of steel pipe products for water mains and expandable rock bolts for underground mine and tunnel roof reinforcement.

Infrastructure solutions

Versatile range of steel pile dimensions

SSAB’s versatile range of steel pile dimensions enables you to select the optimal size, steel grade and length for your project. Piles are installed with driven or drilled technology and come in diameters of 76.1–1220 mm (3.0–40.0 in.) and thicknesses of 6.3–23 mm (0.25–0.91 in.). SSAB’s steel grades especially for piling are S440J2H and S550J2H.

Retaining walls

Build stronger with high performance RRs and RDs steel piles

Our high-strength RRs and RDs piles, in combination with efficient designing, easy and quick installation, lower environmental impact than traditional piling create a solution that is now stronger than ever.

By using the higher steel grade S550J2H, the piles load-bearing capacity can be added by 25% over that of steel grade S440J2H. The increased load-bearing capacity of the pile can be utilised by using smaller piles or decreasing the number of piles. For the customer, this means a significant improvement in the overall economy of the project.
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RRs-piles

 

High performance RRs® and RDs® piles

Higher load-bearing capacity and lower costs

RRs pile selection includes seven common pile sizes

The excellent properties of the RR piles, such as splicing easily and quickly with an external friction splice as well as other pile accessories, are utilized also in RRs piles manufactured of high-strength steel.

Advantages of the high-strength steel S550J2H in SSAB's RRs piles:

By using the higher steel grade S550J2H, pile’s load-bearing capacity can be added by 25 % over that of traditional RR piles. The increased load-bearing capacity of the pile can be utilized by decreasing the number of piles.

Alternatively, a RRs pile made of high strength steel can replace a RR pile with bigger size. Good example of this is RRs125/6.3 pile size, which can easily replace pile size RR115/8.

Customer case Bavo Kademuren harbour
Versatile range of steel pile dimensions

News

Massive RD® pile wall delivery started to major improvement project at Peterhead Harbour, Scotland

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Massive RD® pile wall delivery started to major improvement project at Peterhead Harbour, Scotland

First deliveries of RF/RM interlocked drilled piles have arrived at Peterhead Harbour in November. Drilled piles RD600/12.5 have been produced and interlock welding has taken place in Oulainen works, Finland. Complete delivery consists of 1 062 piles (3 000 t), approximately 10 500 square meters of RD pile wall. To guarantee fast start of the project, combined transportation was used. First piles were delivered in vessels from Raahe, close to Oulainen mill, to Hull harbour in east coast of UK and further transported in trucks to final destination in Peterhead. Rest of the piles, representing the majority of the total delivery, are delivered in vessels straight from Raahe harbour to Peterhead.

Installation of the RD® pile wall has been progressing as planned. Piling contractor is Quinn Piling, one of Ireland’s leading geotechnical experts. So far the installed end result is positive and exceeding expectations. Deliveries and installation will continue until next spring.


Figure 1. Installation of RD pile wall has been progressing as planned

In September, joint venture partnership between civil engineering contractor McLaughlin & Harvey and dredging contractor Boskalis Westminster was appointed by Peterhead Port Authority for Peterhead Scheme 2. The project entails the strengthening and deepening of the inner harbours, land reclamation with revetment, widening of the harbour entrance and demolition works. As well as creating deep water access to the inner harbours, realignment of key structures will improve access to the inner harbours to facilitate larger and deeper drafted vessels. While deepening the harbour, the dredged material will be used to create a 25 000 m2 reclamation area for future developments, while maximising existing resources and achieving environmental benefits for the scheme.

In order to allow the harbour floors to be dredged from -3.2m to -6.5m CD, the existing quay walls within the Harbour will be strengthened using RD® pile wall solution. During the early design phase of the project, SSAB’s technical experts gave guidance on design and installation principles of the solution. Thereafter RD® pile wall was tailored to suit the specific requirements in Peterhead as a result of close collaboration between McLaughlin & Harvey and Peterhead Port Authority’s designer, RPS Consulting Engineers.

“We chose the RD® pile wall solution because it greatly simplifies the pile installation sequence. The client’s original design required the use of rock bunds to install reinforced concrete bored piles in a Hard/Soft pile sequence to form the new quay wall. The RD® pile wall solution eliminated this rock bund and also means the piles can be installed in one step to create a continuous wall with only one piling rig”, says Stephen McAuley, Contract Manager at McLaughlin & Harvey.


Figure 2. Installation of RD® pile wall has started in November

The scheme is part of the overall redevelopment of the Port. It is largest development project in the history of the Port. Work has commenced in the middle of October 2016 and should be complete in April 2018. The Project will enhance Peterhead’s position as Europe’s premier fishing port.


Figure 3. Project will enhance Peterhead’s position as Europe’s premier fishing port

New RRs220/12.5 pile size has been tested and it fulfills all the requirements – CE marking will follow

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New RRs220/12.5 pile size has been tested and it fulfills all the requirements – CE marking will follow

All SSAB’s piling products go through a comprehensive testing before they are approved and CE marked. New RRs220/12.5 pile size has been tested on site and in laboratory. Guidelines for testing methods and requirement levels are presented in EAD (European Assessment Document) for steel pipe piles. Additionally there are also some national requirements for performance levels, which need to be fulfilled.

Most important thing is to test how strong and rigid mechanical pile splices are. Tests for splices start with robustness test. For driven piles this means impact blow tests on site. After impact blow tests the test piles are taken to laboratory for bending, tension and compression tests. For threaded splices used in drilled RD piles the robustness test means tightening test in laboratory.


Figure 1. EAD for steel pipe piles

Impact blow test

Testing is done on site with piling rig. Usually drop hammer or hydraulic hammer is used, but also hydraulic ram can be used for smaller pile sizes. Test piles with splice are first driven to contact with bedrock surface. After contact has been reached, strain transducers are attached to pile to measure stress level in pile during testing. Usually PDA equipment is used to measure and store the data.

According to EAD the number of blows needs to be at least 200 with drop hammer or hydraulic hammer and 2000 with hydraulic ram. The stress level needs to be at least 0.5 x yield strength of the pile pipe.

In Finnish national requirement the number of blows is at least 500 with drop hammer or hydraulic hammer. If tested pile size is meant to be used also in most demanding piling works (Piling Work Class 3 – PTL3), the stress level needs to be at least 0.75 x yield strength of the pile pipe.

All SSAB’s piles are tested to meet more demanding requirements than given in EAD to fulfill Finnish national requirements for the most demanding piling works.


Figure 2. Impact blow tests for RRs220/12.5 pile size with 4 ton hydraulic hammer



Figure 3. Measured stress levels for RRs220/12.5 test pile number P1 during impact blow tests

Bending test

Bending test is used for testing the bending resistance and bending stiffness of the pile splice. Bending test is done in laboratory according to EAD and some national guides.


Figure 4. Assembly drawing of a bending test (Finnish Piling Guide PO-2011)

Bending resistance of the pile with splice needs to be at least the same as bending resistance of similar pile without splice. The bending stiffness of the pile with splice needs to be at least 0.75 x bending stiffness of similar pile without splice in moment range 0.3 – 0.8 x M.


Figure 5. Bending test for RRs220/12.5 test pile number B220-3



Figure 6. Bending stiffness results for RRs220/12.5 pile, sample B220-R is a reference pile pipe

Tension test

Tension test verifies installation capability of the splice. During installation pile faces also tension stresses and therefore also pile splice needs to withstand some amount of tension.
The requirement for the tension resistance is at least 0.15 x tension resistance of similar pile without splice.


Figure 7. Tension test for RRs220/12.5 test pile number T220-1

Compression test

Compression test is not required if pile pipes to be spliced are supported on each other in the whole cross section area and pile splice fulfills the above mentioned requirements for robustness, bending and tension. Compression test is needed for example when testing threaded splices for RD and RDs piles.


Figure 8. Compression test for RD140/10 with threaded splice (KTH test report)

Vestfold Vann IKS is continuing their water mains DN1000 pipeline in Hunstok-Akersvann, Stokke, Norway

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Vestfold Vann IKS is continuing their water mains DN1000 pipeline in Hunstok-Akersvann, Stokke, Norway

SSAB delivers last 2 100 m of DN1000 water mains to Hunstok-Akersvann during December 2016 - February 2017. SSAB’s delivery content for this project includes totally 15 km of coated DN1000 water pipes and fittings during 2014 - 2017. Delivery consists of 16 m long and 5 tons pipes and pipe fittings to the site. All pipes and pipe fittings are externally and internally coated. SSAB’s OV welded joint facilitates installation and allows 2.0 degree bends at joints. Since the OV welded joint is welded from the inside to make it tension resistant, it is suitable for diameters ≥DN 600 and pressures up to 20 bar.

Figure 1. SSAB’s OV welded joint is used in water lines to facilitate installation and to allow 1.5 – 3.0 degree bends at joints.

SSAB is able to produce and deliver by trucks coated pipes quickly and just in time taking into account any changes with time of delivery during the project.
The biggest challenge is to transport and move 16 m long and 5 tons heavy pipes to wet fields before installation within a very short time frame and in very variable winter conditions.


Figure 2. Heavy pipes are 16 m long and weighs 5 tons each

"We chose SSAB to supply the coated steel pipes and fittings because it provides good quality and fast and flexible delivery to the site by trucks“, says Einar Klavenes, Vesfold Vann, Project manager. Vestfold Vann IKS has been established 1968 and is owned together by 10 municipalities in Vestfold county in south part of Norway. The mission of Vesfolf Vann IKS is to offer the partners drinking water of good quality.

SSAB’s main partner is Brødrene Dahl AS and main contractor Arne Olav Lund AS.


Figure 3. Unloading of long and heavy pipes in Stokke, Norway

SSAB’s water mains offer a reliable and economically advantageous solution for water supply. SSAB's welded steel pipes can be used in water mains where the maximum operating pressure is usually 16 bar. Pipe fittings are delivered for diameters ≥ DN 400. The water mains and fittings are delivered flexibly according to the customers’ wishes. The long lifespan of steel pipes is ensured by an external polyethylene coating and an internal concrete or epoxy layer suitable for use with drinking water. There are also suitable inside coatings for sewage and rainwater. The various connection methods can be carried out by welding or with flanges, connectors or sealed sleeve joints. SSAB has long experience from large and demanding pipeline deliveries. Read more: SSAB's water mains

Minimum vibration and noise with RD® pile wall in city center of Malmö

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Minimum vibration and noise with RD® pile wall in city center of Malmö

Region Skåne in Sweden is investing heavily on building a new future hospital in Malmö. RD® pile wall has been chosen as a retaining wall solution for parts of the project. Piling contractor is Skanska Sverige AB Grundläggning. RD pile wall was chosen as a solution due to minimum vibration as well as minimum noise and disturbance to the surroundings compared to other solutions. In total close to 10 km, 665 pieces of RM-RF interlocked RD320/12.5 piles (1030 tons) have been delivered for the project. Regular scheduled deliveries took place between June and October. First part of the RD pile wall was built for new hospital building with two levels of basements. Second part of the RD pile wall was built for the culvert F. Next spring there will be a need for one more RD pile wall for another culvert.


Figure 1. Close to 10 km of RM-RF interlocked RD320/12.5 piles have been delivered to Malmö hospital project between June and October.

Region Skåne is responsible for healthcare and public transport, business development, culture, infrastructure, social planning and environmental and climate-related issues in Skåne. During coming few years Region Skåne will have major investments on the hospital campus in Malmö. The goal is to have a modern hospital that is well prepared for future care. Malmö hospital area investments include two new health care buildings, a new service center and an expanded culvert system. Culvert system will reduce the number of transports in the hospital area. Culverts link healthcare buildings with the new service center and create more efficient transport flows of goods and waste. The work is expected to be completed by 2022.



Figure 2. Second part of the RD® pile wall is built for the culvert F.


Figure 3. Project is located in the city center of Malmö. Limited storage space requires well scheduled deliveries.

Three more RD pile walls have been built by Skanska in Sweden this autumn. In total 3.7 km, 234 pieces of RM-RF interlocked RD400/12.5 piles (505 ton) will be delivered to project Slussen in Stockholm. Deliveries for the project started in November. In Malmö a smaller RD pile wall of 208 tons have been installed in November. In total 1.9 km, 134 pieces of RM-RF interlocked RD320/12.5 piles have been delivered to the project Dalby. Earlier in the autumn Skanska installed RD pile wall for the project SCA Östrand Timrå. In total 2.1 km, 150 pieces of RM-RF interlocked piles were delivered in September.

Savings by replacing larger RR® piles with RRs220/10 piles in major hospital building project for Central Finland Health Care District

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Savings by replacing larger RR® piles with RRs220/10 piles in major hospital building project for Central Finland Health Care District

SSAB launched new RRs220/10 pile size last spring to widen SSAB’s high-strength steel RRs® pile selection. This new pile size enabled cost-efficient alternative design solution for new hospital building project. New hospital will be part of Central Finland Health Care District (KSSHP), which is the largest non-university hospital district in Finland. The district is populated by 250 000 people. New hospital is built in Kukkumäki, Jyväskylä. Total area of the hospital is 100 000 brm2. Building project will continue until 2020 and total cost estimation is 398,5 million euros.


Figure 1. Central Finland Health Care District is building new hospital in Jyväskylä.

Original design of the project included significant amount of RR400/12.5 and RR320/12.5 piles. Those were replaced mostly by RRs220/10 due to material savings realized by stronger steel grade and better resistance-weight ratio. As shown in Figure 2, the material savings can be up to 20 % due to use of high-strength steel in piling. In addition to that the alternative solution enabled use of pile elements which resulted in time savings when splicing is easier and faster compared to splice welding. Also material waste is minimized when leftover piece can be utilized in next pile.


Figure 2. Comparison of relative design resistance [kN] vs. weight of pile pile [kg/m] ratios of different pile sizes.

Alternative solution with smaller diameter piles means also less displacement and disturbance of soil in relation to the load-bearing capacity of the pile. When comparing RRs220/10 and RR400/12.5 pile sizes, similar design resistance is achieved with clearly smaller soil displacement. Figure 3 shows relative soil displacement – resistance ratios for three different pile sizes.


Figure 3. Comparison of relative soil displacement [m3] vs. design resistance [kN] ratios of different pile sizes.

Total project delivery includes 18 000 meters of RRs220/10, 2 113 piles and 3 300 meters of RR170/10, 380 piles. Piling contractor is Kantolan Paalutus Oy. Piling work is realized in two phases; first phase is done during November-December including 60% of the piling and second phase will be done next year during March-April. During the first phase, pile deliveries have been reliable and accurate. Site manager Henri Laitila has been satisfied with the fluency of the deliveries. “Pile deliveries have been able to be synchronized with the progress of the piling so that there have been no need for big intermediate storages at the job site”, he says.


Figure 4. Pile deliveries and piling have been synchronized to avoid the need for intermediate stocks at the job site. Waste has been minimized by using pile elements.

Kantolan Paalutus Oy has two piling rigs at the job site. Piling has gone according to contractor’s expectations and time schedule. Pile lengths have corresponded quite accurately with the expected lengths based on soil investigation. Pile lengths have varied between 1.5 to 13.0 meters. Soil base is sandy and partly rocky, but it has not caused any problems like compaction.


Figure 5. Soil base is mainly sandy silt and partly rocky, but it has not caused any problems like compaction.

RR® & RD® piles - Two different methods for underpinning in Sweden

News archive

HDPE coated RD piles for new hospital building in Turku, Finland

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HDPE coated RD piles for new hospital building in Turku, Finland

Turku University Hospital (TYKS) is building a massive new building, named T3 Hospital, on top of existing E18 freeway and a rail road. New building will have total area of 54 000 m2 in eight stories. Total budget for the project is 158 M€.

Figure 1. New building will rise on top of existing E18 freeway and a railroad, just next to T2 Hospital (photo: www.vsshp.fi).

Due to tight schedule of the project and demanding soil conditions, drilled RD piles were chosen for the project. Pile sizes RD800, RD600 and RD400 are used. RD800 piles are drilled three meters (4xD) and smaller ones 2 meters into the bedrock and grouted to the hole to ensure rigid connection. Piles are inclined and also tension anchors are used to take heavy accidental lateral and lifting loads.

Due to cold winters in Finland, a de-icing salt is often used for roads. This causes severe corrosion environment for steel piles. In TYKS T3 project RD800 piles are exposed to de-icing salt and the corrosion is taken care with 3-layer HDPE coating on piles. Additional to the coating, the resistance of the piles has been calculated with extra 2 mm corrosion allowance to wall thickness.

Handling and quality of the coating in focus

One of the most important things to ensure intact coating is careful handling of the piles at all stages of the transportation and installation. To ensure the coating is intact after installation three of the piles were lifted up after drilling. The coating of these test piles was checked visually and if necessary also with a holiday detector. “Two first test piles have shown no remarkable marks in the coating”, says Reino Heikinheimo, geotechnical designer from Ramboll Finland, and continues: “Only some small holes at the pile toe, where the clamps of the drill rig have grabbed to the pile pipe. These holes aren’t causing corrosion problems due to grouting of the pile toe to the bedrock. I think the reason, why the coating has remained intact, is very careful and skillful installation team”.

Before the start of the project Lemminkäinen, the contractor, thought coating would cause significant problems during installation. “We prepared for damages in the coating with training of repair and a big bunch of repair materials. Now we have installed 97 pcs of coated piles and we have used only handful of repair patches”, says Kai Jaakkola, drilling supervisor for Lemminkäinen. “Our installation team has learned more gentle way to handle piles. I think this helps us also in normal projects, because they are handling also un-coated piles with more care”.

Cutting and peeling of the piles

Since the coating is a plastic material, the cutting can’t be done with a cutting torch. Too high temperature would set the coating on fire. The cutting of the piles has been done with plasma cutter, which produces significantly less heat.

Due to heavy lateral loads, there is a need to get a rigid connection between concrete foundation and the pile pipe. Therefore the coating is removed from top most part of the pile. This is done with the help of little heat.

HDPE coated piles

External triple-layer coating is done according to DIN 30670 N-n (1991) standard. An epoxy film protects the pile against corrosion while a polyethylene film shields the epoxy film against damage. Third layer is an adhesion layer between epoxy and polyethylene film. Prior to coating the pile pipe is cleaned by sand blasting and the smoothness of the surface is checked.

Usual thicknesses vary from 2.2 mm (RR/RD400) to 3.0 mm (RR/RD1200). In severe conditions an increased thicknesses, +0.7 mm, are used. Maximum thickness available is 6.0 mm.

HDPE coating can be applied to SSAB’s large diameter piles (RR/RD400…RR/RD1200). The production line enables coating of 10…18 meter long pile pipes. Also longer piles are available with splice welding and a joint coating.

Storing and handling of the coated piles needs much more attention than uncoated piles. Clamps and other lifting equipment can easily leave marks to the coating. Wooden backings are required when pile pipes are stored at the site, and extra care needs to be paid to pebbles and stones. All sharp edges and jigs need to be removed from drilling rig.

If in spite of above the coating has damaged, it can be repaired. Damaged polyethylene can be repaired with special repair materials. When damaged area is small, also epoxy can be fixed. In larger damaged areas the damaged part needs to be removed.

Figure 2. RD800 piles are drilled and waiting for cutting. Inclination is due to heavy accidental loads.

Figure 3. Some of the piles were drilled from closed freeway lanes during night time.

Figure 4. Ready RD800 piles (cut, peeled, reinforced and concreted).

Figure 5. Small marks at the coating of extracted test pile number two (photo: Arto Heikkilä Ramboll CM Oy)

Excavation and anchoring of RD pile wall finished in Pasila Tripla, Finland

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Excavation and anchoring of RD pile wall finished in Pasila Tripla

SSAB has finished the second phase of deliveries to Pasila Tripla, a massive billion-euro construction project near the city center of Helsinki in Finland. In the last newsletter SSAB’s extensive RD pile wall delivery of close to 4 200 tons of piles, totally 13 500 square meters, was presented. RD pile wall delivery started in May 2015 and after the installation was finished by mid November 2015 the deliveries continued with casing tubes for the anchoring until June 2016.


Figure 1. Southern part of the RD pile wall in August 2016 after excavation and anchoring.

Finished RD pile wall meets all the demands

After the installation of the RD pile wall and excavation it is now evident that it meets all the demands excellently. RD pile wall complies with tight tolerances of installation and water-proofing. Finished wall is fully waterproof. Installation deviations are minimal and within required tolerances – wall is extremely straight without any leaking.


Figure 2. Anchoring of RD pile wall. SSAB delivered most of used casings for anchors.

 

Second phase of the deliveries to Pasila Tripla

SSAB´s pile deliveries and close and intensive co-operation with YIT has continued after RD pile wall installation from spring 2016. Next pile deliveries included smaller RD pile wall deliveries for shaft structures and pile deliveries for building foundations.


Figure 3. During summer 2016 SSAB delivered piles for building foundations. Delivery included RD1200/12.5 and RD1200/14.2 with steel grade S440J2H. Northern part of the RD pile wall in the background.

SSAB’s tubular product deliveries during 2016:

RD piles for building foundations and Pasila station

  • RD1200/12.5 and RD1200/14.2 (S440J2H), 470 ton in total
  • RD220/12.5 (S440J2H), 35 ton in total
  • RD400/12.5 (S440J2H), 300 ton in total

RD pile walls for shaft structures

  • RF/RM interlocked drilled piles RD600/16 (S440J2H), 265 ton in total
  • RF/RM interlocked drilled piles RD700/14.2 (S440J2H), 100 ton in total

Pipes for struts to support the excavations

  • RR600 and RR700, 60 ton in total

 

Figure 4. Installation of RD piles for building foundations.

YIT’s massive construction project Pasila Tripla still lasts couple of years and the co-operation with SSAB continues. 

New breakwater based on large diameter piles to Port of Ust-Luga in Russia

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New breakwater based on large diameter piles to Port of Ust-Luga in Russia

Ust-Luga Port is the biggest and deepest port of the Baltic Sea, including the Baltic States and Finland.

The port developer, JSC Ust-Luga Company, was established in 1992 to construct Ust-Luga Commercial Sea Port with a capacity of 180 million tons of various cargo per year in the Baltic Sea, namely in Luga Bay of the Gulf of Finland.

In order to protect the port activities from the sea, a 1300 m long breakwater, made first shortly as a ballast embankment and mainly as a large diameter pile structure, was constructed in stages between 2013 and 2017.

The breakwater structure consists of 1020x12 mm pipe-pipe wall connected by LPB180 interlocks and 1220x12 mm inclined piles on the both sides of the wall. The upper parts of the piles have been coated in a facility close to the port. Piles were installed by using vibratory hammers and finally by impact hammers, if needed. After installation the upper parts of the piles were concreted and tied together by cast-in-place concrete superstructure.

Figure 1. Breakwater, made first shortly as a ballast embankment and mainly as a large diameter pile structure, was 1300 m long.

SSAB’s delivery scope to it’s client ThyssenKrupp Infrastructure GmbH has been consisting of 650 pcs of LPB180 interlocked piles 1020x12 mm, 5 600 ton (14 800 m in total) and 475 pcs of 1220x12 mm, 4 100 ton (11 400 m in total). The piles have been produced and the interlock welding has been taken place in SSAB’s Oulainen factory in Finland during 2014-2016. All piles for each stage have been loaded in dedicated vessels for delivery straight into Ust-Luga.

 

Figure 2. SSAB’s delivery scope has been consisting of 650 pcs of LPB180 interlocked piles 1020x12 mm, 5 600 ton and 475 pcs of 1220x12 mm, 4 100 ton.

The designed interlocked pipe-pipe wall structure requires that the individual pile elements will have strict out-of-roundness tolerances after welding. Thanks to the state-of-the-art interlock welding lines in Oulainen and long-term & extensive experience on interlock welding, the EN 1090 certified factory was able to meet the end-customer’s expectations.

“We chose SSAB because of the convenient location of the pipe production, short delivery time and good quality” explains Tatjana Detzel, Head of Department Export at TKBT.

Fast and easy installation of SSAB C210/130X4 median barriers to highway VT23 in Finland

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Fast and easy installation of SSAB C210/130X4 median barriers to highway VT23 in Finland

SSAB's median barrier is an effective way of improving traffic safety. Median barriers are used on roads between opposing lanes to prevent collisions between vehicles. Kuu Ras Oy installed SSAB C210/130X4 median barriers to passing lane in Kypäräjärvi in September. SSAB’s delivery to highway VT23 included 1 860 m median barrier and 3 780 m side barriers.

Figure 1. Kuu Ras Oy installing SSAB’s median barriers in Kypäräjärvi passing line in September.

This was the first installation of SSAB C210/130X4 median barriers for Kuu Ras Oy. According to Kuu Ras Oy this median barrier is faster and easier to install than the previous model, Box beam. The connection is better and it includes fewer screws which makes it faster to install.

Figure 2. Highway VT23 is 517 km long from Pori to Joensuu. Kypäräjärvi passing line is situated 80 km before Joensuu. (photo: www.wikipedia.com)

SSAB C210/130X4 has replaced the old model of median barrier, Box beam. “The aim was to develop economical solution for customer. Cost efficient installation was one key driver. Number of components has been minimized. SSAB C210/130X4 has only 8 screws per splice when the previous model, Box beam, had 20 screws per splice. Also there are no special screws with limited availability required. Only 2 types of screws are needed, which also promotes easiness of installation”, says Arja Häihälä, Sales Manager in SSAB. “In addition to fast and easy installation, cost efficiency of the median barrier system has been improved by introducing high-strength steel grades”, she continues.

Figure 3. SSAB C210/130X4 median barrier enables cost-efficient installation.

CE-approved and crash-tested median barrier

SSAB’s median barrier is crash tested and compliant with the requirements of the standard EN1317­2. It has proven its durability in demanding environmental conditions. The high-strength median barrier meets the requirements of impact containment levels H1 and N2 and has been CE-approved.

  • The system incorporates several solutions that improve the cost-efficiency of the barrier:
  • The barrier system is made of open section and incorporates an innovation that eliminates tight post length assembly tolerances from the installation process.
  • End anchors can be installed without drilling through asphalt layers, speeding up the installation of end anchors.
  • The number of screws in rail splices has been minimized to speed up installation.
  • Rail length is 12 metres.
  • Rail posts placed at four metre intervals can be imbedded directly in the ground or pre-installed sockets. Socket installation can be used for example with opening sections. 

 

Figure 4. SSAB safety barrier solutions include median barriers, side barriers and a selection of rails and posts.

Sales and Technical support

Arja Häihälä

Sales Manager, Safety barriers

Mobile phone: +358 40 046 4534

Send email: arja.haihala@ssab.com

 

Two different methods for underpinning historical buildings in Stockholm and Gothenburg, Sweden

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Two different methods for underpinning historical buildings in Stockholm and Gothenburg

Underpinning was needed to prevent excessive settlement of historical buildings in Stockholm and Gothenburg. In Pyramiden, Stockholm, steel core piles were replaced by RD piles with threaded splicing. In Högvakten, Gothenburg, RR piles were used with two different techniques. Foundation contractor was Betongsprutnings AB BESAB in both underpinning cases.

Costs savings due to the replacement of steel core piles to RD piles and the use of high strength steel in Kv Pyramiden in Stockholm

Ten buildings established between 1898 and 1914 needed underpinning to prevent excessive settlement. End customer was Svenska Bostäder. Skanska Sverige AB was general contractor and Betongsprutnings AB BESAB was foundation contractor. Each building was underpinned using 50 - 300 drilled RD piles with threaded splicing and each pile needed to be between 20 m and 25 m long to reach the bedrock. Drilling of piles was done with water powered drilling.

Through the development of a custom made drop hammer, BESAB’s own design, the bearing capacity of the drilled RD piles could be measured even in the tightest of work spaces. This made it possible for BESAB, in agreement with the customer, to switch from steel core piles to RD piles. This change of piles led to savings between 10% - 20% for the project. The use of SSAB’s high strength steel piles in S550 grade contributed a lot to the savings.

Figure 1. Bearing capacity measured with PDA by using custom made drop hammer even in the tightest of work spaces.

SSAB’s delivery included RD170/10, RD170/12.5, and RDs170/10 piles with threaded splices. Length of pile elements varied between 1 - 1.5 m. Delivery was in total 1 159 m, 1 136 pile elements.

Figure 2. SSAB’s delivery included threaded RD piles and high strength steel RDs piles.

RR piling in Kv Högvakten, Gothenburg

Four of Gothenburg’s oldest buildings in the city centre needed underpinning due to excessive settlement. Higab, a real estate company owned by the City of Gothenburg, ordered the underpinning from foundation contractor Betongsprutnings AB BESAB. Steel piles were delivered by SSAB. The underpinning used two different techniques. One technique was to core drill through the dry rubble, then drive RR piles on each side of the dry rubble and place a bearing beam on top of the driven RR piles which carries the weight of the building. All of the steel above ground was grouted for protection against corrosion. The other technique used was zig-zag piling. Holes were core drilled with a slight incline through the wall and stone foundation. Then RR piles were driven through the holes to the hard bearing layer and cut from the bottom level of the foundation. Finally the holes in foundation were filled with concrete.

Figure 3. Driving of RR pile.

SSAB’s delivery consisted of RR piles, RR90 and RR115/6.3, including rock shoes and bearing plates. Delivery was in total 1 258 piles, 36 000 m. Length of pile elements varied between 1-3 meters.

 

Figure 4. Control of splices.



New nearly zero-energy day care center with energy piles to Vantaa, Finland

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New nearly zero-energy day care center with energy piles to Vantaa, Finland

City of Vantaa is building a new day care center to replace old one. New day care center is designed for 126 children. Energy efficiency and energy piles have big role in the building. The aim is to build nearly zero-energy day care center with advanced energy saving techniques.

Old day care center in Vaarala has suffered from traffic noise and particulate matter emission. It has also been found to be impractical and expensive to use. Therefore City of Vantaa has decided to build totally new day care center to better location nearby.

 

Figure 1. Illustration of new day care center (photo: www.vantaa.fi)

The project is a pilot project for new nearly zero-energy building concept of City of Vantaa. All new day care centers are to be built according to this new concept. It is also a pilot project for building information modeling (BIM). The building will have total area of 1500 m2 and estimated costs are 5.4 M€.

“In Finland there are no actual regulations for nearly zero-energy buildings. We set our own target to reduce the total energy consumption of the building to half of the regulations for new buildings”, says Energy Efficiency Specialist Marita Tamminen from Vantaa City Real Estate Centre. “Chosen solutions are based on careful cost and energy calculations. Naturally several different kinds of sensors are installed to verify the actualizing energy consumptions in the future.”

Solar energy and energy piles are utilized to reduce the need of energy. Solar energy is used for heating the water and also to charge heat energy through energy piles to ground during summer time. This charged thermal energy is then extracted from ground during the winter time to warm the building.

Solar energy panels for the project are supplied by Ruukki Construction. Ruukki has vast experience on low energy buildings and especially on energy piles. Heat collecting pipes, other pipelines and equipment for energy piles were designed and supplied by Uponor. Uponor has been involved in almost every energy pile projects in Finland.

Same piles working as load bearing and energy collection

Total amount of piles is 137 of which 54 are energy piles and equipped with heat collecting pipes. The minimum distance between energy piles is 3 meters. This is why it’s not economical to put heat collector pipes to every pile. Eight of the energy piles are not supporting the building, those piles are located to the floor area of the building, where distance between bearing piles is much larger than 3 meters.

Utilization of steel pipe piles to work as energy piles doesn’t mean big changes to pile and foundation structures. Structural and geotechnical resistances of piles remain the same. Only differences in piles are bearing plate with hole for heat collecting pipes and internal grouting. Internal grouting enables transition of heat energy from soil to collector pipes.

Figure 2. Driving of steel pipe piles, installation was done by Suomen Teräspaalutus Oy

Usually the length of energy pile should be at least 15 meters. Pile lengths in Vaarala day care center are approximately from 14 meters to 20 meters and the average length of piles is 18 meters. The length of each energy pile was sent to Uponor and heat collecting pipes were prefabricated at Uponor’s workshop to fit exactly to each pile. Also the energy calculations were updated to match actualized lengths of piles and heat collecting pipes.

Figure 3. Installation of heat collector pipes to piles

Heat collecting pipes are making a double loop inside the energy piles. With double loop there are four heat collector pipes inside the energy pile, but only two pipe heads per pile needs to be connected.

Figure 4. Due to double loop there are four heat collector pipes inside the energy piles

 

Figure 5. Heat collector pipes installed and ready for further connections

Main contractor of the project, Rakennus Future Oy, sees that energy piles cause no problem for other construction works. “Installation of heat collecting pipes needs only little extra scheduling, but that is not a problem”, says Kari Tasanko, site manager of the project, “Modern buildings contain so much technical installation, the increase for that is very small”.

eRR and eRD energy piles

SSAB’s steel pipe piles can be used to collect energy stored in the ground and bedrock. Traditionally, the heat collecting pipes of ground source heat solutions have been installed either in energy wells drilled into bedrock or horizontally in topsoil. If the building site requires piling, SSAB’s steel pipe piles allow installing the heat collecting pipes directly inside steel piles installed in the ground without extra excavation work or drilling of energy wells.

The energy pile system is especially suited for buildings that need both heating and cooling. In their case the system keeps the thermal balance of the soil suitable for energy production for decades.

Energy pile products

Nearly all sizes of SSAB’s wide range of RR and RD piles can be used as energy piles. Driven RR piles and drilled RD piles can be used as energy piles as such without major changes.

The drilled eRD energy pile can be implemented, where necessary, also as a so-called hybrid pile solution where a deep energy well is drilled through a pile installed to bedrock.

  • The accessories of eRR and eRD piles are the same as those of RR and RD piles with the exception of the bearing plates:
  • The tip of the eRR pile is protected by a bottom plate, a rock shoe, etc.
  • The tip of the eRD pile has a normal drill bit
  • Piles are spliced using SSAB’s reliable and easy-to-use mechanical splices or by welding
  • Penetrations are made in a standard shaped bearing plate to enable installation of heat collecting pipes through it

 

eRR and eRD piles are installed just like RR and RD piles. The only new work phase is the installation of heat collecting pipes inside piles after piling.

 

 Simply the best technology

  •  Energy piles collect effectively ground source heat
  •  Performance is predictable and measurable and remains high throughout the service life of a building
  •  The properties of energy piles are attributable to the reliable SSAB RR or RD steel piles and the Uponor heat collection system
  •  Energy piles serve as normal bearing foundation structures of a building – no extra piles are needed

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