Post tensioning safety

Post tensioning is a technique for reinforcing concrete.

Post-Tensioned Concrete

Post-tensioning tendons, which are prestressing steel cables inside plastic ducts or sleeves, are positioned in the forms before the concrete is placed. Afterwards, once the concrete has gained strength but before the service loads are applied, the cables are pulled tight, or tensioned, and anchored against the outer edges of the concrete.

Post-tensioning is a form of prestressing. Prestressing simply means that the steel is stressed pulled or tensioned before the concrete has to support the service loads. Most precast, prestressed concrete is actually pre-tensioned-the steel is pulled before the concrete is poured. Post-tensioned concrete means that the concrete is poured and then the tension is applied-but it is still stressed before the loads are applied so it is still prestressed.

Post-tensioning is simply a way to reinforce in a more active way. By Bill Palmer, ConcreteNetwork. Advantages of Post-Tensioning. PT Construction Basics. The Post-Tensioning Industry. Tennis Court Surface Options. Find Decorative Concrete Contractors. Copyright ConcreteNetwork.Even congested tendons can be routed around obstructions. Digital Concrete Scanning Services. Construction of post-tensioned slabs on grade is very similar to using reinforcing steel, except for the tensioning step.

How to evaluate and manage post-tensioned concrete

Cables are arranged as indicated by the engineer and chaired to run through the center of the slab. For residential construction, tendons at 48 inches on center are common. Commercial foundations will have much more steel. Tendons can be easily routed around obstructions.

Tendon cable tails after tensioning. The cables are pulled to 33, pounds, resulting in 8 inches of elongation in a foot cable. A residential post-tensioned concrete slab will typically be 8 inches thick and use psi concrete. Once the concrete has gained strength to psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed.

Tendons today are seven high-strength steel wires wound together and placed inside a plastic duct. At each end a PT anchor is located and these are located in pockets embedded into the slab edge. When the strands are stressed, the wires will stretch—about 4 inches for a 50 foot strand—to apply 33, pounds of load. Stressing should only be done by qualified workers.

After stressing, the tendon is cut off and the pocket in which the anchors are located is filled with grout to protect them from corrosion. Larger structural concrete members may also be post-tensioned, especially in bridges and floors and beams in parking structures.

The process is very similar to that used for slabs, except on a bigger scale. One interesting difference is that the tendons will often be "draped" so that they are low at the midpoint of a beam and high at the supports—this places the steel at the point of highest tension where it can keep the concrete held together tightly.

With structural members the duct is often grouted full following stressing to bond the strand to the concrete along its entire length—these are called bonded tendons. Unbonded tendons, used in residential slabs, remain free to move within the duct and are protected from corrosion by grease. PT tendon placement and stressing is usually done by companies with certified workers who specialize in this work. Since PT is simply reinforcement, there really aren't any specific decorative applications related to post tensioning.

The advantages of PT as noted in the opening page are the lack of cracking or at least very narrow cracks and the ability to span farther.

PT slabs on ground can be placed and stamped just like with any other concrete slab. Surfaces can be stained or overlaid. The only concern is to always remember not to cut or drill into post-tensioned concrete slabs, since once a tendon has been cut, it is very difficult to repair. Many post-tensioned slabs will be stamped to alert the owner and any renovation contractors that the slab is post tensioned.

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This cantilevered golf course green is actually a post-tensioned concrete slab. Suncoast Post-Tension.

Post Tension Concrete Construction

There are two groups offering certification specifically related to post-tensioned concrete construction:. How to Install Post-Tensioning. A post-tensioned countertop can support a lot of weight. Find Decorative Concrete Contractors. Copyright ConcreteNetwork.View case studies to learn how post-tensioning can be used effectively in a wide variety of applications. Click here for Staff Directory. PTI has an active presence on social media and regularly updates its followers on everything new at PTI via the following platforms:.

P-T Applications

PTI is recognized as the world-wide authority on post-tensioning and is dedicated to expanding post-tensioning applications through marketing, education, research, teamwork, and code development. Case Studies. Parking Structures. About PTI. What Is Post-Tensioning? Post-tensioning is a method of reinforcing strengthening concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. Our Future Vision.

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PTI envisions a future in which post-tensioning is the first choice for reinforcing all structures. Our Business Mission. PTI will promote and advance the post-tensioning industry through education and technical leadership.

post tensioning safety

Members of the Institute include major post-tensioning material fabricators in the U. In addition, PTI has more than professional engineers, architects and contractors. Contact Us. Follow Us. Tweets by ConcretePTI.

Request an unlock code for Superuser or Staff access. Unlock Code:. Please enter this 5 digit unlock code on the web page.Suncoast is one of the few post-tension providers with a dedicated safety department. Starting with the leadership team and extending throughout the company, safety is a priority. Our dedicated safety department has an established policy and manual, helping to maintain safe operations across the nation, and within our best-in-class PTI-certified manufacturing facilities.

Since establishing the safety department, Suncoast has reduced reported incidents dramatically. Our safety director manages the in-house safety program, supported by established policies and initiatives, such as automating dangerous fabrication lines work, which resulted in a dramatic reduction in reported incidents. These proprietary manufacturing processes not only minimize incidents, but also increase rate of production.

Our executive team is committed to the protection of the environment and the health and safety of its employees, customers, and neighbors.

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This commitment is nationally embraced and ensures we provide a safe work environment. Our Safety Goal The construction industry in which all of our businesses operate poses significant safety challenges, but we do not accept that people will inevitably be injured while working for us or with us.

Our ultimate goal is to have zero incidents through the effective management of safety in all our operations. Everyone has the authority to stop work until it is safe without the risk of repercussions. These Safety Principles define our safety culture, behaviors and performance standards, and, in so doing, assist us in our progress towards eliminating injuries in our workplace.

Our Safety Policy Our managers and supervisors are accountable for the safety of our people and are expected to provide effective leadership in safety. Management of every business or operation is responsible for following the Safety Principles and implementing and maintaining the Safety Standards. We set appropriate objectives against which to monitor progress toward zero incidents. All employees are responsible for good safety behavior and it is only by working together and recognizing that we all have a part to play in safety that we will really make a difference.

Skip to content Search for:. Contact Careers News. Toggle main menu visibility. Sole Focus. Unbonded Post-Tension. Post-Tension Safety Leaders Suncoast is one of the few post-tension providers with a dedicated safety department. Dedicated Safety Department Our dedicated safety department has an established policy and manual, helping to maintain safe operations across the nation, and within our best-in-class PTI-certified manufacturing facilities.

Our Safety Principles Underpinning this goal are three fundamental Safety Principles: All incidents are preventable We believe that all injuries and occupational illnesses are preventable. We are all responsible for preventing and correcting unsafe behavior or work conditions. No repeat occurrences Reportable accidents and high potential near misses are investigated to determine the details and causes.

The findings and necessary steps to prevent recurrence are disseminated and implemented. Maintain Safety Standards We have adopted a common set of safety standards throughout the Group. Management at all levels is responsible for implementing and enforcing these standards. Look out for others.For decades, we have been your competent contact for bridge, industrial and tank structures in Construction Engineering. We are not only using our know-how for new construction projects, but also for the structural repair and strengthening of existing structures.

Choose yourself which system we can support you with during your project. Select your region and country now in order to get more detailed information about our products and systems. For decades, our systems have been renowned for their extraordinary versatility and reliability.

The first-rate corrosion protection of our Post-Tensioning Systems contributes significantly to the longevity of structures. As permanent members in the corresponding committees of experts and standards, we are continuously promoting technical developments as well as the safety and applicability of our products and systems.

Our systems offer a high degree of flexibility in many applications around the globe. Furthermore, we always supply custom-designed products matching your individual requirements.

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We hold technical approvals for internal and external Post-Tensioning Systems consisting of high-strength strands, wires and post-tensioning bars and have the authority to carry out tensioning work. Our systems are certified in accordance with ETAG inspection guidelines guideline for the European Technical Approval for construction sets for post-tensioning supporting structures. These European approvals are complemented by existent national technical approvals and general approvals issued by local building inspection agencies.

You can use our systems worldwide in demanding cryogenic applications during the construction of LNG and LPG Tanks - permanently and safely. Are you looking for a Post-Tensioning System that can be installed efficiently and quickly in floor slabs, flat slabs and barrier systems?

DYWIDAG Monostrand Tendons comply with national norms and have been ensuring the construction of light-weight and efficient flat slabs and fast construction progress for many years. This is how we make your construction project more profitable. We have been significantly involved in the development, construction, and execution of support cables, cable-supported structures and stay cables since Our economic and high-performance Stay Cable Systems are the essential components of aesthetic bridge structures in many projects around the world.

They reliably transfer the loads to the foundation via the pylon and are long-lasting and easy to maintain. Our external post-tensioning tendons are used around the world for the construction of bridges and wind energy structures. The strands and wires can be restressed and replaced individually, thus offering maximum flexibility for your project.

In that year, a tradition began that we have successfully continued on a global scale until today. Our bar tendons are also used for a permanent, force-fit connection of concrete and steel such as they are needed for the construction of wind towers or other structures.

Our systems can be used as bonded or unbonded bar tendons as well as external tendons for a large variety of applications. We offer the following Services: We design and develop technically sophisticated and flexible Post-Tensioning Systems and methods We are happy to support you with technical planning We produce in our own factories and ensure the availability of our systems and our special equipment - anytime and anywhere On demand, we take care of installation, training or installation supervision Inspections and maintenance also form part of our services.

Certified Quality - Technical Approvals for Post-Tensioning Supporting Structures We hold technical approvals for internal and external Post-Tensioning Systems consisting of high-strength strands, wires and post-tensioning bars and have the authority to carry out tensioning work.They embrace the whole spectrum from bridge construction and buildings, to civil applications, above and below ground.

In addition to the traditional post-tensioning system using bars, that is mainly geared towards geotechnical applications, building rehabilitation and strengthening, DSI offers a complete product line in strand post-tensioning bonded, unbonded and external as well as stay-cables being able to fully serve the post-tensioning construction.

We look back on many years of valuable experience in the field of post-tensioning which leads to our extremely versatile product range that offers economical solutions for practically any problem.

post tensioning safety

This includes our highly developed, most sophisticated equipment which is easy to operate in all phases beginning with assembly, installa tion, stressing and finally grouting. The American construction market demands a product range that is described in separate brochures. High fatigue resistance is achieved with optimized material selection and cautious detailing of all the components especially in their system assembly.

Strands are made from 7 individual cold-drawn wires, 6 helically wound outer wires and one center wire king wire. The mechanical properties of the strand as well as corrosion protection properties are most important to DSI. For a maximum in corrosion protection we offer electrically isolated systems using polyethylene PE or polypropylene PP ducts. Post-Tensioning System using Strand Strands are made from 7 individual cold-drawn wires, 6 helically wound outer wires and one center wire king wire.Did you attempt to repair plumbing, electrical, sleeves without calling the lab for a locate, find a broken tendon after a sub installed a tub, anchor plate, etc?

The slab is over-engineered and depending on the location of the broken tendon a repair may not be required.

post tensioning safety

This is a decision only the PT engineer can make. Prepare an RFI with the location clearly described and marked on a tendon layout diagram from the plans, ask if repair is necessary then send RFI and follow RFI response instructions.

If repair is required coordinate with repair tech and determine what prep work is needed to complete the job. Would you be able to recommend a certified Contractor that is able to do work on Guam regarding post tension cables? Thank You.

Interesting information, I am a state of Florida certified gc, If you visit my site and add a comment I will approve it and provide a back link to your site. By: RW Spurlock on December 19, at am. Currently performed several PT cable repairs at a condo building on the water. Wanted to know what specific testing should be done to the damaged cables, anchors, wedges, etc.???

What is typical required?

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The first step is to locate the slab specs part of the construction documents and the Owner, the Home Owners Association office, at the condo may have these. Many large concrete contractors who specialize in PT slabs have a tensioner and operator.

There should be documentation regarding the last time the tensioner was calibrated. As far as recommendations for test labs in any city I would recommend calling the largest concrete contractors in the area and ask them who they use. The original concrete sub may have been out-of-state.

The lab will probably ask you when will repairs be completed and by whom and will there be a set of plans or specs at the pull? Ideally, if the concrete sub on the project can be hired they should have all of the documents, info and resources to complete the repair of the tendon s turnkey.

Also, some companies specialize in PT tendon repair and concrete renovation. By: Marshall Hansen on September 15, at am. Thanks Marshall for the speedy and detailed response. I still have a few more questions that I am not too clear on how to proceed.

The building in question was built with first generation PT system i. All PT cable ends were kept in tact one foot length of PT cable with engaged anchor and wedges. What should be the next step to attempt to determine the conditions for the balance of the existing PT cables? Typically for this type of scenario, what is the standard testing procedure, if any at all? I would like to send specifically the wedges to a lab for testing. Is this relevant at all? Should the wedges be tested to see if they have lost their grip ability?

However, my field PT experience is limited to new construction management multi-family and light commercial with related issues. I have no affiliation in any way, contact or connection with SPS but from the case studies on the site it looks like this is their bailiwick.

By: Marshall Hansen on September 16, at pm. Are there no other houses for sale in all of Phoenix?! By: Marshall Hansen on June 6, at pm. Dear sir, I am working as a Project engineer for the post tensioning works. I need to get all the details of making inspection for installation, stressing and grouting works. I need exactly the specifications.


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