Fixed end P-type anchoring device

Abstract

The invention relates to a fixed end P-type anchoring device. The fixed end P-type anchoring device comprises an extruding heat, a fixed anchor plate, a steel strand, a constraining ring, a spiral reinforcing bar and a corrugated pipe, wherein one end of the steel strand sequentially penetrates through the constraining ring and the corrugated pipe, the spiral reinforcing bar is arranged outside the constraining ring, the steel strand penetrating through the corrugated pipe is provided with a mortar outlet pipe, and the other end of the steel strand is sequentially connected and anchored to thefixed anchor plate and the extruding head; the extruding head is in a plug type and composed of a cylindrical unit and a truncated cone unit connected to one end of the cylindrical unit; the fixed anchor plate is provided with a truncated cone-shaped hole matched with the truncated cone unit of the plug type extruding head. Compared with the prior art, the fixed end P-type anchoring device can better facilitate single-end tensioning of longitudinal prestressed bars of a multi-span cast-in-place continuous beam, reduce the construction difficulty of the multi-span continuous beam cast-in-placesingle-end tensioning process, improve the working efficiency and reduce additional auxiliary working structures as much as possible.

Description

technical field [0001] The invention relates to a prestressed tension anchor, in particular to a fixed-end P-type anchor. Background technique [0002] For the multi-span continuous beam cast-in-situ single-end tensioning process, the construction space of the fixed-end P-type anchorage is often limited to the steel cage, which is relatively narrow. The conventional construction process is to pass all the steel strands in a bundle through the reserved round holes of the fixed anchor plate, then use the jack to install the extrusion head to the end of the steel strand, and finally pull the steel strands to the designed position, and fix the anchor plate Pull until the extrusion head is flush. Since the diameter of the round hole reserved for fixing the anchor plate is close to that of the steel strand, there is a phenomenon that the construction is difficult during the construction process, which is mainly reflected in the following aspects: [0003] (1) When multiple bundl...

AI Technical Summary

Problems solved by technology

[0003] (1) When multiple bundles of steel strands are penetrated into the fixed anchor plate, the frictional resistance is relatively large, making it difficult to penetrate. Workers often use small sections of steel pipe scaffolding to drive the fixed anchor plate to a certain depth

[0004] (2) After the extrusion head is installed, there is also a large frictional resistance when the fixed anchor plate is pulled to be flush with the extrusion head, which makes it difficult to penetrate. Many workers often use long scaffolds outside the steel cage to fix the anchor plate. The anchor plate is driven into the corresponding position

The thickness of the conventional anchor plate is 1.5cm to 2cm, and the clip is designed to be used as a supporting anchor plate, and its length must be small, making and installing it is not easy; if the length of the designed clip is conventional 4cm to 7cm, the thickness of the anchor plate must be increased. The weight of the fixed anchor plate will increase, which is not conducive to the construction in narrow spaces

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