The DYWIDAG THREADBAR® Rock and Soil Anchor System is manufactured in the United States and Canada exclusively by DYWIDAG-Systems International.
High Bond Strength
The deformation pattern provides excellent bond between the bar and cement grout, allowing a reliable transfer from the anchor prestress load into the grout without the need for additional mechanical devices. The narrow spacing of the deformations assures close crack spacing in the surrounding grout and therefore, the smaller crack width will not degrade the corrosion protection.
The bar is anchored using a threaded nut, which, unlike a wedge type anchorage, is not liable to slip when the anchor force is reduced due to possible ground movements. In addition, the threaded nut anchorage has a known overload capacity, which cannot be duplicated, by a wedge type anchorage without the utilization of elaborate and expensive details.
The THREADBAR® can be removed after destressing the anchor by unscrewing the unbonded portion of the bar from a coupler or out of an embedded end anchorage. Bars with end anchors and sleeved within the bond length can be completely removed. This is especially important where temporary anchors are installed below adjacent properties and must be removed after use.
Easy to Stress
The reliable and compact threaded nut anchorage has almost no anchor set. Its hemispherical shape easily accommodates the small angular misalignments between bar and anchorage due to construction tolerances. Lightweight, durable equipment makes stressing, restressing and adjusting the anchor load up or down easy to do.
Unprotected anchors are used for temporary applications. The free stressing length is unprotected while the bond length is embedded in the cement grout body. Unprotected anchors may be subject to corrosion. However, the relatively large diameter and solid cross-section of the DYWIDAG THREADBAR® offers more corrosion resistance than smaller diameter high strength, prestressing steel elements with a larger surface area.