A prestressed anchor bolt tile shaft rotary anchor head

Abstract

The invention discloses a pre-stressed anchor tile shaft rotary anchor head. The pre-stressed anchor tile shaft rotary anchor head comprise tiles, a tile shaft and a snap spring. Each tile is a half cylinder with the variable cross section in the inner diameter circumference and the cylindrical direction. The two tiles are combined to form a cylindrical anchor head outer body with the same outer wall radius. The tile shaft is in the shape of a circular truncated cone, two gradual changing section supporting keys are symmetrically arranged on the outer wall of the middle section of the tile shaft. Supporting key clamping grooves matched with the supporting keys are symmetrically formed in the thin-wall ends of the tiles, and the tile shaft is arranged in the anchor head outer body. A snap spring groove is formed in the middle sections of the tiles, and the snap spring is arranged in the snap spring groove. According to the anchor head, the outer end of an anchor rod is rotated, the tile shaft and the anchor rod rotate synchronously, the tiles are expanded and fixed to the wall of an anchor rod bottom hole, larger the tension is, larger the supporting anchor fixing force becomes, and therefore the anchoring requirement is met. The anchor head is ingenious and reasonable in structural design, easy to operate, short in construction period and high in coat performance.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, relates to the technical field of prestressed bolt anchorage for foundations, slopes and underground engineering, and in particular to a prestressed bolt anchor head. Background technique [0002] In the construction of underground engineering, foundation foundation, slope engineering, etc., prestressed anchors are often used for initial support. At present, the commonly used prestressed anchors mainly include ordinary mortar (anchor agent) prestressed anchors, shell expansion hollow Prestressed anchors. [0003] In the construction process of ordinary mortar (anchor agent) prestressed anchor rod, high-strength mortar or anchor agent is usually used as the inner anchor section, and the anchorage length is longer, up to 2-3m. The prestressing needs to wait for the mortar or anchor agent to reach the design strength. It can only be carried out at the right time, usually it needs to wait for...

AI Technical Summary

Problems solved by technology

[0003] In the construction process of ordinary mortar (anchor agent) prestressed anchor rod, high-strength mortar or anchor agent is usually used as the inner anchor section, and the anchorage length is longer, up to 2-3m. The prestressing needs to wait for the mortar or anchor agent to reach the design strength. It can only be carried out at the right time, usually it needs to wait for 8 hours or even longer, and the construction period is longer, which affects the progress of the project and the timeliness of support; during the construction process of the shell-expanding hollow prestressed anchor, the shell-expanding mechanical anchor head is usually adopted As the anchoring section, the rod body adopts a hollow anchor rod, and the material cost is 2 to 3 times higher than that of ordinary mortar prestressed anchor rods, and the requirements for drilling are relatively high, which increases the construction cost

Images