Formwork-erecting-free cast-in-situ inverted trapezoidal composite beam and construction method thereof

Abstract

The invention discloses a formwork-erecting-free cast-in-place inverted trapezoidal composite beam and a construction method thereof. The composite beam comprises a mid-span section and bracket sections at the two ends, the mid-span section and the bracket sections are integrally bent and formed, the mid-span section and the bracket sections are arranged in an inverted trapezoidal shape and comprise bottom lower flanges and inclined webs on the two sides, and horizontal flanging plates are arranged at the tops of the inclined webs; a plurality of top stirrups are arranged between the two horizontal flanged plates, and a plurality of vertical face ribs and end face ribs are arranged on the lower sides of the top stirrups of the composite beam. The composite beam is simple in structure, the steel plate can serve as a concrete pouring formwork, formwork erecting and stirrup binding are not needed on site, the site construction workload is small, and factory industrial production can be achieved; the steel plates can serve as bottom ribs to improve the bearing capacity of the composite beam, the number of the bottom ribs is greatly reduced, and the upper width of the beam is increased to increase the arrangement number of surface ribs.

Description

technical field [0001] The invention relates to the field of building structures, in particular to a formwork-free cast-in-place inverted trapezoidal composite beam and a construction method thereof. Background technique [0002] Conventional concrete beams require on-site formwork to pour concrete, and there are a large number of formwork and formwork work, which has a large workload, cumbersome construction, and low efficiency. Concrete beams are flexural components, and the tension zone at the mid-span and the compression zone at the support need to be densely covered with steel bars, and even two or three rows of longitudinal bars may be arranged. It seriously affects the on-site vibration of concrete, and is likely to cause construction quality problems. Multiple rows of steel bars reduce the moment arm between the bottom bar and the gluten bar, resulting in insufficient material strength. The height of traditional steel girders is not included in the thickness of the...

AI Technical Summary

Problems solved by technology

It seriously affects the on-site vibration of concrete, and it is easy to cause construction quality problems

Multiple rows of steel bars reduce the moment arm between the bottom bar and the gluten, resulting in insufficient material strength

Images