Post-tensioning
Products
Post-tensioning of bridges
The MK4 post-tensioning system proposed, includes a gear range of anchorages, accessories and the necessary equipment to respond to the technical requirements for the construction of bridges and other structures.
The design and calculation of all components has been carried out in accordance with the European code ETAG-013, compliance with which is mandatory for all post-tensioned structures built in the European Union.
As application, we are providing post-tensioning for any structure as bridges, buildings, tanks of liquefied gas LNG, silos, covertures, communication towers, nuclear power stations, suspended structures, etc. in either internal or external post-tensioning.
The services provided by MK4 include the following aspects:
- Technical assistance in all the phases of the project from the design to the final execution.
- A large range of live end and dead end anchorages and couplers, being always ready for any development or change according to the specifics needs of the project.
- The designed system was successfully tested according to the new European standard ETAG-013 for post-tensioning systems.
- The possibility to use metallic and PE/PP ducts depending on the project specifications
- Automatic and lightweight stressing equipment.
- Study of alternative design or construction method as an improvement for the optimum solution for every project.
- LNG and ethylene tanks
- Wind mills
Post-tensioning in buildings
The use of post tensioning systems in buildings offers numerous advantages and is increasingly being used in this industry.
The crucial role of post-tensioning in structures
In these structures, post-tensioned concrete plays a crucial role. It has proven to be an efficient, economical and fast way of construction. By using a post-tensioning system such as MK4, structural stability, durability and long-term performance are strengthened.
Unbonded monostrand systems
MK4 can offer unbonded monostrand systems (greased and PE-coated stand). The MK4 unbonded mono-strand system uses 0,6” and 0,62” diameter strand of 1860 MPa capacity.
Multi-strand bonded systems
Multi-strand bonded systems with either round or flat corrugated duct is also provided as an alternative for the construction of slabs in buildings when this type of system is required.
The advantages of PT in buildings can be summarized as follows:
- Reduced quantity of reinforcement for passive bending and shear.
- Larger column free space.
- Thinner slabs and reduced volume of concrete.
- Speeding up the construction cycle.
- Reduced construction joints.
- Crack-free slabs.
- Minimised foundations.
- Reduced maintenance costs.
MK4 also offers a conventional supply, installation and tensioning package. In addition, the package can be completed by including alternative slab design.
Post-tensioning in structures
Tanks (food tanks, LNG tanks, Silos), Water Reservoirs and Wind Towers are also an important part of MK4 scope of projects.
MK4 technical expertise and long experience in similar projects will assist you and support you in any phase of the project.
Regarding LNG projects, MK4 system owns ETA approval for cryogenic and LNG tanks and has also carried out several specific test under cryogenic conditions in independent laboratories complying with the most stringent international standards. Vertical tendons and horizontal tendons are normally used.
The use of precast or in-situ post-tensioned concrete instead of steel is becoming more and more common in windfarms.
This is mainly because it offers very important advantages: higher energy production thanks to higher pylons, lower transportation costs, construction flexibility, smaller maintenance costs.
Our Wind Post-Tensioned concrete Towers have been specifically certified by DNV/GLL for one of our wind farms in Brazil. Towers were almost 120 m height.
MeKano4 has developed a complete Quality Assurance System in accordance with ISO 9001:2000 and in compliance with the requirements of the new European code EAD 160004 – 00-0301 and EAD 160027 – 00-0301 for Post-tensioning, including the design, production, supply and installation of all required PT works, such as anchors, auxiliary equipment, strand stringing, tensioning and injection. Thus, the quality system covers all post-tensioning works carried out by MeKano4. (MK4 WW)
