Możesz polegać na SSAB, które dostarcza najwyższej klasy produkty infrastrukturalne, oferujące dobrą jakość w stosunku do ceny. Dla nas partnerstwo z klientami oznacza zobowiązanie do terminowych dostaw oraz konsultacje w trakcie projektowania i realizacji projektów na życzenie klienta.
Szeroki zakres wymiarów pali stalowych SSAB umożliwia wybór optymalnego rozmiaru, gatunku stali i długości dla Twojego projektu. Pale montowane są technologią wwiercania lub wbijania i dostępne w przedziale średnic 75–1220 mm oraz grubości 6.3–23 mm. Gatunki stali SSAB przeznaczone specjalnie dla pali to S440J2H oraz S550J2H.
Pale RRs są obecnie produkowane w 7 najbardziej typowych wymiarach.
Doskonałe właściwości pali RR takie jak łatwe łączenie za pomocą tulei ciernych, jak również możliwość wykorzystania innych akcesoriów, odnosi się również do pali typu RRs (pale w gatunku stali S550J2H).
Zalety wykorzystania pali RRs w wyższym gatunku stali S550J2H:
Dzięki wykorzystaniu wyższego gatunku stali S550J2H, nośność pali wzrasta o 25 % w porównaniu z tradycyjnymi palami RR. Większa nośność pali może oznaczać zmniejszenie ilość pali w konstrukcji, a tym samym niższy koszt wykonania konstrukcji.
Opcjonalnie, pal RRs wykonany ze stali o wysokiej wytrzymałości może zastąpić pal RR o większym rozmiarze. Dobrym przykładem jest pal RRs125/6.3, który z łatwością może zastąpić pal RR115/8.
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.
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”.
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.
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)
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.
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.
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.
RD piles for building foundations and Pasila station
RD pile walls for shaft structures
Pipes for struts to support the excavations
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.
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.
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.
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.
Figure 4. SSAB safety barrier solutions include median barriers, side barriers and a selection of rails and posts.
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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.
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.
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.
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.
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”.
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.
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.
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.
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