Pre-tensioned deformed reinforced concrete precast main beam

Abstract

The invention discloses a pre-tensioned deformed reinforced concrete precast main beam. The pre-tensioned deformed reinforced concrete precast main beam is characterized in that a beam body has an inverted T-shaped section and is composed of a horizontal rectangular compression-resistant part and a vertical rectangular shearing-resistant part; stirrups are embedded in the vertical rectangular shearing-resistant part; parts of the stirrups stretch out of an upper surface of the vertical rectangular shearing-resistant part; U-shaped stirrups are embedded in the horizontal compression-resistant part; U-shaped stirrup upper parts having certain length stretch out of an upper surface of the horizontal compression-resistant part; and steel strands are embedded in the horizontal compression-resistant part. A step of the pre-tensioned deformed reinforced concrete precast main beam having the inverted T-shaped section can be straightly provided with a secondary beam so that secondary beam installation is convenient. In construction, when a temporary support is arranged at a lower part of the secondary beam, no additional rebars are arranged at a loading step.

Description

technical field [0001] The invention relates to a building prefabricated component, in particular to a prefabricated beam used for a frame composite beam as a main beam. Background technique [0002] At present, the prefabricated main girder used for laying the secondary beam usually adopts a gap at the junction of the distance section and the secondary beam, so that the laying head of the secondary beam is placed on this gap, or a prefabricated main girder disclosed in ZL201020553626.2 patent. There are holes that can pass through the secondary beam reinforcement, and the primary and secondary beams are integrated after the concrete is poured and tamped. It is more troublesome, and it will also weaken the compressive section of the prefabricated main girder when the prestress is released, which will affect the flexural strength of the beam during the construction stage. A kind of inverted T-shaped prefabricated main girder that can be conveniently shelved without shelving ...

AI Technical Summary

Problems solved by technology

[0002] At present, the prefabricated main girder used for laying the secondary beam usually adopts a gap at the junction of the distance section and the secondary beam, so that the laying head of the secondary beam is placed on this gap, or a prefabricated main beam disclosed in ZL201020553626.2 patent. There are holes that can pass through the secondary beam reinforcement, and the primary and secondary beams are integrated after the concrete is poured and tamped. It is more troublesome, and it will also weaken the compressive section of the prefabricated main girder when the prestress is released, which will affect the flexural strength of the beam during construction

An inverted T-shaped prefabricated main girder that can be conveniently shelved without shelving the pick-up beam and the secondary beam has not been reported

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