The bolt is made from a section of Ø33, Ø39, or Ø48 mm in diameter and dedicated thickness. The cross-section of the bolt is an incomplete outline of the pipe that closes during the bolting operation.
The upper part of the anchor is formed into a cone. The lower part has a retaining ring for mounting the washer. When set in the hole, the bolt is given the required load capacity due to elastic rod structure.
Expansion shell bolts are easy to handle, while they are implemented fast. In the case of expanding anchors the anchor foot is braced against the borehole wall with wedge-shaped spreading elements. Resins or mortars are not required to secure the anchor. They are also used for the attachment of various components of mining equipment.
Upon insertion of the expansion anchor into the borehole, the plastic ring holding the wedges at their minimum diameter is scraped at the borehole edge. Immediately after this, the liberated wedges assume the geometry of the borehole under the spring effect. Any return movement is now excluded and each load transferred from the anchor rod to the expanding head causes further spreading of the wedges.
This bolt offers fast and reliable rock reinforcement with assured quality and guaranteed mechanical properties.
The bolt rod is made from a section of ø39 mm in diameter and 3 mm thick. The cross-section of the rod resembles a cylinder whose edges overlap forming a tube. The upper part of the rod is bevelled and appropriately formed while the bottom part has a reinforcing sleeve and a hole for fitting the attachment unit.