Anchor device of first sliding and then fixing type combined steel anchor boxes of cable stayed bridge and construction method thereof

Abstract

The invention discloses an anchor device of first sliding and then fixing type combined steel anchor boxes of a cable stayed bridge and a construction method thereof. The anchor device comprises multiple anchor box segments continuously arranged in the vertical direction, wherein each anchor box segment is provided with an anchor box side pulling plate, a bolting end and a fixed end; the anchor box side pulling plate is positioned in the middle; the bolting end and the fixed end are respectively arranged at the left and right ends of the anchor box side pulling plate; the bolting ends and fixed ends in the adjacent anchor box segments in the vertical direction are arranged in a staggered manner; sliding pairs are arranged between the bolting ends and fixed ends in the adjacent anchor box segments in the vertical direction; and both the bolting ends and fixed ends of the anchor box segments are provided with connection structures combined with concrete in the tower wall of a cable stayed bridge tower. The device can give full play to the tensile strength of anchor box steel, simultaneously avoids transferring excessive horizontal pull to the tower wall, avoids that the steel anchor boxes prevent contraction of the tower wall, and avoids that the concrete tower wall is unilaterally stressed when the stay cables are replaced or broken. The invention also provides a construction method of the anchor device.

Description

technical field [0001] The invention relates to an anchoring structure of an anchor box of a cable-stayed bridge and a construction method thereof, in particular to an anchoring device of a combined steel anchor box of a cable-stayed bridge that slides first and then solidifies and a construction method thereof. Background technique [0002] The cable anchorage structure of the cable tower is an important force-bearing structure that safely and evenly transmits the local concentrated force of a cable stay to the tower column. For long-span cable-stayed bridges, there are mainly three anchoring methods: tooth block plus tower wall prestressed anchorage, steel anchor box anchorage and steel anchor beam anchorage (there is generally no prestressed anchorage in the tower wall when the steel anchor box and steel anchor beam are anchored). stress). The tooth block plus prestressed anchor generally adopts the "U" shaped prestressed beam or "well" shaped prestressed beam, and the p...

AI Technical Summary

Problems solved by technology

The tooth block plus prestressed anchor generally adopts the "U" shaped prestressed beam or "well" shaped prestressed beam, and the prestressed force is applied to ensure that the concrete tower wall does not crack. The tower is small, with a large space for jacking in the tower, but there are many anchoring tooth plates in the tower, the construction is cumbersome, the positioning accuracy and quality of the cable anchor pipes are difficult to control, the steel bars in the cables and prestressed tooth plates are dense, and the concrete is difficult to compact. Larger; the bending radius of the hoop prestressed bundle is small, the loss of prestress is large, the number of bundles is large, and there are many vertical and horizontal steel bars cut at the anchor notch, which is unfavorable for resistance; and all processes require on-site high-altitude operations, and the overall construction Quality is not easy to guarantee

The steel anchor box is manufactured in the factory, and the position of the anchor point and the angle of the anchor pipe are easy to control; the disadvantage is that the horizontal force of the cable m

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