Retard-bonded prestressed reinforcement beam top curling-up tensioning assembly and construction process thereof

Abstract

The invention discloses a retard-bonded prestressed reinforcement beam top curling-up tensioning assembly and a construction process thereof. During construction, retard-bonded prestressed reinforcements are arranged in prestressed concrete beams in bundles in the longitudinal direction or evenly, start to be dispersed at retard-bonded prestressed reinforcement curling-up tensioning ends evenly and are sequentially curled up according to a parabola to form a plurality of rows of tensioning ends; then beam top tensioning is conducted, the tensioning assembly used in the tensioning process comprises beam longitudinal common reinforcements and pressure bearing plates vertically sleeving the retard-bonded prestressed reinforcement curling-up tensioning ends, and additional reinforcements are arranged between the beam longitudinal common reinforcements and the pressure bearing plates; spiral reinforcements sleeving the retard-bonded prestressed reinforcements are arranged on the inner sidesof the pressure bearing plates; and cavity molds are arranged on the positions, perpendicular to the pressure bearing plates, on the outer sides of the pressure bearing plates. The prestressed reinforcements are tensioned at the beam tops, large grooves do not need to be reserved in the beams, and the weakening influence on the beam sections is small; and additionally, when the beam tops are tensioned, the operation space is large, and construction is flexible and convenient.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a slow-bonding prestressed tendon beam top pull-up tension assembly and a construction process thereof. Background technique [0002] A prestressed concrete beam is a force that is pre-applied to the beam to generate a negative bending moment in the mid-span to partially offset the positive bending moment of the beam in use and avoid premature cracks in the reinforced concrete structure. It makes full use of high-strength steel bars and high-strength concrete, and tries to reduce or offset the concrete tension caused by the load before the structural member is subjected to the load, so as to control the tensile stress of the structural member in a small range, even It is in a state of compression to delay the appearance and development of concrete cracks, thereby improving the crack resistance and stiffness of the components. [0003] The slow-bonded pr...

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Problems solved by technology

In order to ensure that the jack has enough tensioning space, the tensioning groove is required to be relatively large. In this case, the section weakening of the prestressed concrete beam will be severely weakened, and measures need to be taken to ensure the stress safety of the weakened beam section; on the other hand , it is difficult to stretch the prestressed tendons in the stretching groove, and the construction is troublesome

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