Anchor system for fixing steel strand in pre-stressed structure

Abstract

The invention discloses an anchor system for fixing a steel strand in a pre-stressed structure. The anchor system comprises an anchor board, an anchor bearing plate, below-anchor spiral ribs and clamping pieces, wherein a main body of the anchor bearing plate is in a cylindrical form and gradually contracts from outside to inside; three round pressure-bearing steel boards are adhered to the outer side of the cylindrical main body at certain intervals; the sizes of the three-order steel boards are gradually reduced from outside to inside; and the middle part of the cylindrical main body is used for threading of pre-stressed steel. The anchor bearing plate of the anchor system adopts the form that the three-order round pressure-bearing boards are arranged along depth, a first-order pressure-bearing board shares more than a half of concentrated force, a second-order pressure-bearing board and a third-order pressure-bearing board share about 2 / 3 and 1 / 3 of the residual concentrated force, and the concentrated force of the anchor board is uniformly transmitted to the deep part of concrete below an anchor, so that not only can partial pressure stress under the anchor be prevented from being too concentrated, but also the limitation effect of the below-anchor spiral ribs can be effectively improved. Therefore, the occupied area and the space of the anchor bearing plate can be greatly reduced, and a design space and a construction property for anchor configuration in beam-column node positions of a reinforced concrete frame can be greatly enlarged and improved.

Description

technical field

[0001] The invention relates to a device used in prestressed structures of buildings and bridges, in particular to an anchorage system used for fixing steel strands in prestressed structures. Background technique

[0002] The development of the anchorage system is mainly matched with 12 stranded wires with a diameter of 12.7mm on the tension side most commonly used in prestressed structures. The anchorage system is named CUUI13-12.

[0003] Domestic and foreign representative anchorages OVM series (Ovam Company of China), ATC series (Antosen Company of Japan), FNSN series (French Company of France), etc. are widely used in civil engineering and bridge structures, and their common feature is uniform Meet the seismic design and construction requirements. However, the common disadvantages are: the volume, single area and self-weight are large, and it is difficult to set up in the beam-column joints of the building structure. The common square compression plate...

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