To best comprehend Post-tensioning, it's time to consider the major differences between pre-stressed and reinforced concrete. Both reinforced and pre-stressed concretes utilize the structural abilities of concrete and steel. Concrete is exceptionally strong in compression but comparably weak in tension. Reinforced concrete beams supports loads at its top consider it can't resist the tension at the bottom, which could easily leads to its crack.
Steel bars in reinforcement are utilized to place inside the tension zone to handle the cracking. Pre-stressed concrete (PC) entails the application of forces that typically bend and compress a concrete structure in counteractive bending that derive from loading. The pressure applied include the tensioning of the steel component and in the look of wires, bars or high tensile strands. Known as a typical practice, suppliers calibrate Stressing Equipments to accomplish post-tension installation successfully.
Difference Types of Stressing Equipments
Multi Strand Jacks are commonly used to stress all strands inside a cable all at the same time. The benefit from this type of jack is due to its high-speed and high precision for stressing operation to complete for the cables in a single trouble-free step.
Single Strand Mono Jacks have three fundamental models 10T mono jack is designed for that mining industry, and can be used as overhead works. 17T mono jack is in actual a designated 0.5 strand inside a lightweight steel model; it's double acting and uses 3-piece reusable wedges. Lastly, the 25T mono jack capable of stressing 5mm wire up to 15.2mm strand using the easiness of exchanging two components using the stokes of 6, 8, 12,18 and 24.
Grout Pumps are generally employed for leveling concrete slabs, filling cracks, raising sunken concrete, sealing concrete holes, as well as for repairing tunnels, parking structures and bridges. The kind of grout pump is dependent on the complexness from the job, either air-powered or manual based on what grout pump is needed.
Staple machines aren't like any ordinary stapling machines. This is practically employed for attaching strands for prestressing concrete (PC). By manually operating staple machines it may be used in certain sites that are isolated where high air pressure systems aren't accessible.
Onion Jacks are utilized to eliminate the use of anchor plates or wedges by creating anchor point for prestressing cables. The device forms an onion contour around the end from the cable by means of distributing and splitting individual wires.
Swaging Jack is a kind of Stressing Equipment that crushes or swages a barrel and wedge setting it towards the end of the prestressing cable to produce position point. This jack is lightweight and power-driven by machine or a hands pump.
Inappropriate handling and proper care of Stressing Equipment might result in damage of property or perhaps physical injuries of the operator. Only qualified and well-trained personnel are permitted to function the gear during its practice. Operators doing the stressing along with the inspectors must always remain clear from the tendons being stressed under any situation. Jacks ought to be put on the strand to become stressed. It's not recommended to adjust the positioning of the jack by striking or pushing after any load continues to be already applied. Don't exceed the designed capacities from the tendons or even the jacks being stressed, excessive pressure might result in personal injuries. To maintain jacks, it's important to use only approved clean hydraulic fluid and change it if needed. Jacks should be cleaned immediately whenever it is exposed to air, rain or any other corrosive environments after exposure. Don't stress any tendons which have concrete slurry within the anchor cavity, this can delay appropriate seating from the wedges.
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