Post Tension Wedge

Post-tensioning wedges

Post-tensioning wedges are components used in prestressed concrete structures. Prestressed concrete is a technique that increases the strength and load-bearing capacity of concrete structures by applying pressure to the concrete to improve its mechanical properties.

In prestressed concrete structures, steel strands or groups of strands are tensioned before pouring concrete. These strands are pre-tensioned and then anchored by a series of post-tensioning wedges to maintain tension after the concrete hardens. These wedges are usually made of high-strength steel and have reliable anchoring and holding power.

Post-tensioning wedges are usually wedge-shaped and can be embedded in prestressing tubes or anchor bolts. They are placed at the tensioning end of the prestressing strands and locked in place by applying sufficient force through the tensioning device. Once locked, the wedges will maintain the tension of the strands, ensuring additional strength and rigidity of the concrete structure.

Product Components:

The cylinder and wedge are two required components used to hold the tendon or prestressing wire tightly during pullout to create tension. The cylinder will have a tampering surface to which the wedge will lock as force builds.

Cylinder: A cylindrical component that fits over a single prestressing strand in an anchor and transfers the strand force to the anchor via a tapered wedge that sits within its internal tapered recess. A set of cylinders can be used with momo strand tendons as an alternative to anchor blocks.

Wedge: A tapered high-strength steel member with internal serrations that grips and holds the prestressing strand during and after tensioning. The three sections of the wedge are placed around the strand and when the jack is retracted, it is pulled into the tapered recess in the anchor area, compressing the strand.

Product Features:

- High Strength: The post-tensioning wedge is made of high-strength material, which can withstand a wide range of prestressing and ensure that the steel strands are firmly fixed in the concrete structure.

- Corrosion Resistance: The surface of the product has been specially treated, which has good corrosion resistance and can be used for a long time in harsh environments.

- Adjustability: The wedge design makes it adjustable, and the prestressing can be precisely controlled and adjusted according to actual needs.

- Easy to install: The post-tensioning wedge is easy to install and flexible, suitable for prestressed concrete structures of various sizes.

Product related parameters:

Advantages of using this process:

- Increased strength: Since the post-tensioning wedge can apply prestress, the strength and bearing capacity of the concrete structure can be significantly improved, making the structure more solid and stable.

- Increased span: The prestressing technology using post-tensioning wedges can reduce cracks in concrete structures, allowing the structure to withstand larger spans and reduce the number of support points.

- Material savings: Compared with traditional reinforced concrete structures, prestressed concrete structures using post-tensioning wedges can reduce material consumption and improve the economy and sustainability of the structure.

Application scenarios

Bridge construction: used for prestressed concrete bridges to enhance the bearing capacity and crack resistance of the structure.

High-rise buildings: used for building foundation reinforcement, basement top slabs and large-span floor slabs.

Water conservancy and hydropower engineering: used for structural reinforcement of dams, ports and docks.

Tunnels and mines: used for anchoring of tunnel tops and rock reinforcement of mines.

Others: such as large warehouses, workshops, subways, slipform construction, etc.

Development prospects:

As an important component of prestressed concrete structure, post-tensioned wedge has broad application prospects in buildings, bridges, tunnels and other fields.

- In the construction of urban infrastructure, more and more large bridges and high-rise buildings are beginning to adopt prestressed concrete technology, and post-tensioned wedge will play an important role in it.

- With the acceleration of urbanization and the increasing requirements of building structures for strength, durability and energy saving, prestressed technology and its component post-tensioned wedge will usher in more extensive applications.

- Prestressed concrete structure has obvious advantages in reducing the consumption of building materials, improving construction efficiency and extending the life of the structure. Post-tensioned wedge is expected to become one of the important development directions in the future construction field.