Extrusion-type anchoring structure of prestressed concrete stretching fixing end

Abstract

The invention discloses an extrusion-type anchoring structure for a prestressed concrete stretching fixing end. The extrusion-type anchoring structure comprises a stretching anchoring plate, an anchoring cushion cover, a corrugated pipe and a plurality of prestressed cables, wherein the anchoring cushion cover is connected with the inner end face of the stretching anchoring plate; the corrugated pipe is connected with the end face of the anchoring cushion cover; the plurality of prestressed cables are inserted into the stretching anchoring plate, the anchoring cushion cover and the corrugatedpipe in sequence; an a plurality of extrusion anchorage devices for fastening the extension ends of the prestressed cables are arranged on the outer end face of the stretching anchoring plate in orderto keep a preset length. According to the extrusion-type anchoring structure, the prestressed cables are inserted into the stretching anchoring plate, the anchoring cushion cover and the corrugated pipe in sequence, so the parts, positioned at the fixing end, of the prestressed cables are protected, the prestressed cables are prevented from being in direct contact with external concrete, and corrosion is avoided. Meanwhile, through extrusion fixing and length limitation of the extension ends of the prestressed cables by the extrusion anchorage devices, the anchoring lengths of the prestressedcables can be controlled within a proper range, and the prestress application length is prevented from getting too long or too short.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a prestressed concrete tension fixed end extrusion type anchorage structure. Background technique [0002] With the development of civil engineering technology, civil engineering facilities with different structural forms are widely used. [0003] Bridge design and construction is a typical application example of civil engineering technology. The purpose of engineering construction control is mainly to ensure the reliability and safety of the structure during the construction process, and to ensure that the stress state of the bridge meets the design requirements. For prestressed bridges, prestressed construction control is the main factor affecting the realization of bridge construction control objectives, which is related to the internal force of the main girder and structural safety, and is the core of prestressed bridges. Therefore, it is of great significance to c...

AI Technical Summary

Problems solved by technology

[0004] Due to linear, aesthetic and functional requirements, it is often necessary to build multi-connected multi-span cast-in-place prestressed concrete continuous girder bridges. In the design of multi-connected cast-in-place prestressed concrete continuous girder bridges, the space of each beam end is limited, and it is difficult to meet the prestressed concrete continuous girder bridge design. Due to the space requirements for stress tensioning, the tensioning method of prestressed steel strands inevitably adopts single-end tensioning

[0005] At present, the most commonly used anchorage at the fixed end of the single-end tension is to use square extrusion anchors for anchoring, but the distance between the fixed anchor plate and the restraint circle is difficult to control. If the distance between the fixed anchor plate and the restraint circle is too short, the If the anchorage length of the stress steel strand is too short, its holding force is not enough, and the steel strand is prone to slip in the concrete, which may easily cause quality accidents; on the contrary, if the anchorage length of the prestressed steel strand is too long, the prestress will be applied The length will drop, resulting in insufficient prestress

More importantly, during the construction process, the prestressed steel strands are directly bonded to the concrete, which intensifies the corrosion of the prestressed steel strands, which can easily lead to quality problems, resulting in a reduction in the ultimate bearing capacity of the bridge, which in turn affects the bridge structure safety, even prestress failure, leading to bridge accidents

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