A method for strengthening the ventilation holes of cast-in-place box girders

Abstract

The invention discloses a strengthening method for a vent-hole of a cast-in-place box beam. A hard PVC tube and a pull rod are included, wherein the hard PVC tube is pre-buried in the vent-hole, and the pull rod penetrates through the hard PVC tube. The pull rod penetrates through the hard PVC tube, and the two ends of the pull rod both extend out of the hard PVC tube by at least 10 cm; and the two ends of the pull rod are both tapped with threads, the lengths of the threads are at least 10 cm, the rod walls, exposed out of the hard PVC tube, of the two ends of the pull rod are sleeved with base plates correspondingly, and the outer sides of the base plates are sleeved with nuts which can be in screw fit with the threads of the pull rod. According to the strengthening method for the vent-hole of the cast-in-place box beam, the operability is high, the firmness and the reliability are achieved, the construction requirements can be met, and the phenomena of movement and deviation in the concrete pouring process are thoroughly avoided; and the common quality problems of deviated preformed hole sites, sand molding lines of a beam bottom concrete surface, poor color and luster of the beam bottom surface, a pitted surface of the beam bottom surface, loose peripheral concrete and the like caused by loose vibration on the periphery of a breather pipe are solved effectively.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a method for strengthening vent holes of cast-in-situ box girders. Background technique [0002] Box girder is a kind of middle beam in bridge engineering. It is hollow inside and has flange plates on both sides of the upper part, which is similar to a box, hence the name. Single box, multi-box, etc. The box girder of reinforced concrete structure is divided into prefabricated box girder and cast-in-place box girder. The prefabricated box girder combined with the bridge erecting machine can be erected after the completion of the substructure, which can speed up the progress of the project and save the construction period; the cast-in-place box girder is mostly used for large continuous bridges. [0003] At present, the common materials are divided into two types, one is prestressed reinforced concrete box girder, and the other is steel box girder. Among them, the pre...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a method for strengthening the ventilation holes of cast-in-situ box girders, which solves the problem of clogging of the ventilation pipes, displacement of the reserved holes, sand lines on the surface of the concrete at the bottom of the beam, poor color of the surface of the bottom of the beam, and problems at the bottom of the beam. Problems such as surface pitting, surrounding concrete is not dense, etc.

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