Long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method

Abstract

The invention discloses a long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method. The method comprises the steps of mounting of a strutbeam bottom mold and binding of nonprestressed reinforcements, welding of a prestressed tendon support, mounting of corrugated pipes, penetrating arrangement of prestressed tendons, acceptance of concealed work, concrete pouring, stretching of the prestressed tendon, grouting of pore channels and anchor sealing of the stretching end, wherein the step of penetrating arrangement of the prestressed tendons comprises the substeps of penetrating arrangement of the corrugated pipes at the two ends or one end, binding of corrugated pipe supporting points, mounting of spiral bars and anchor bearing plates at the stretching end and blocking of a post-cast strip formwork. The method adopts a post-cast strip inside bonded prestressed beam construction method, structural reserved holes are reduced, and the structure integrity is ensured; and by adopting the design that the bonded prestressed stretching end is arranged in a post-cast strip, the design stress is ensured, the stress loss is reduced, and thus the structure safety is ensured.

Description

technical field [0001] The invention relates to a building construction method, in particular to a construction method for internal tensioning of a large-span concrete frame beam with bonded prestress and post-casting. Background technique [0002] The construction of the tension end of the bonded prestressed beam generally adopts haunch tensioning, using the haunch plate to exit the tension end to ensure the tensioning operation space, and then use the tension end to reserve a post-tensioning hole for tensioning operations . [0003] First, cut off the steel bars in the reserved hole, and carry out the tensioning operation. After the prestressed tensioning, grouting, and anchor sealing operations are completed, the template, square wood and other slag inclusions such as formwork and square wood will be removed from the reserved post-casting hole, and then the frame body will be carried out. For erection and formwork support, the surface of the steel bar is derusted and cle...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to reduce the risk of stress loss caused by variable-angle tensioning, over-tensioning and broken wires, and the problems of complex procedures, unsafety, water leakage, and irregular appearance caused by reserved post-casting holes, the present invention provides a Long-span concrete frame beams have bonded prestressed post-casting belt tensioning construction methods to ensure the construction quality of bonded prestressed beams in tension

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