Concrete beam and system that comprises said beam

Abstract

A concrete beam includes longitudinal reinforcements so that the cross section cuts through the longitudinal reinforcements and includes transverse reinforcements that surround the longitudinal reinforcements, and at one end a rectangular recess for the fitting and support of the end of the beam on a column. The cross-section includes at each end of the beam according to the transverse direction a lower extension that define in the beam longitudinal flanges for the support of prefabricated floor elements, the beam being provided at each end of a steel profile with an L-section having a first flange arranged on the lower extension and a second flange joined to the transverse reinforcements. Also related is a construction system having a column, a prefabricated slab element, and the beam.

1 . A concrete beam in which a longitudinal direction and a transverse direction are defined, and a vertical direction is defined that is perpendicular to the longitudinal direction and the transverse direction, the beam comprising longitudinal reinforcements so that the cross section of the beam, which is in the plane defined by the transverse and vertical directions, cuts through the longitudinal reinforcements and comprises transverse reinforcements contained in said plane, such that the transverse reinforcements surround the longitudinal reinforcements, wherein at one end according to the longitudinal direction the beam comprises a rectangular recess for the fitting and support of the end of the beam on a column, the cross-section comprising at each end of the beam according to the transverse direction a lower extension according to the transverse direction, so that these extensions define in the beam longitudinal flanges for the support of prefabricated floor elements, the beam being provided at each end according to the transverse direction of a steel profile with an L-section having a first flange arranged on the lower extension and a second flange joined to the transverse reinforcements. 
     
     
         2 . The concrete beam according to  claim 1 , wherein both ends comprise a rectangular recess for the fitting and support on a column. 
     
     
         3 . The concrete beam according to  claim 1 , the other end comprises a rectangular protrusion designed for fitting on the rectangular recess of a beam that has continuity in the next span, so that in the longitudinal rectangular recess there's thick concrete protrusions in the transverse direction placed at the bottom half of the section of the beam, and the end with the longitudinal rectangular protrusion has thick concrete protrusions in the transverse direction placed at the top half of the section of the beam designed to fit and lay on the concrete protrusions of the rectangular recess of a beam that has continuity in the next span, the end of the beam provided with the rectangular recess comprising a rectangular through opening, that may be connected with the rectangular recess, the through opening being placed at the position of the junction with the column to allow for the bearing of the beam and for the passing of the vertical reinforcement of the column. 
     
     
         4 . The concrete beam according to  claim 1 , wherein the second flange is arranged on the vertical surface of the beam. 
     
     
         5 . The concrete beam according to  claim 1 , wherein the second flange extends to an upper surface of the beam. 
     
     
         6 . The concrete beam according to  claim 1 , further comprising longitudinal reinforcements arranged in an upper section of the beam and in at least one central section of the beam that covers at least 75% of the total length of the beam. 
     
     
         7 . The concrete beam according to  claim 1 , whose dimension along the transverse direction is at least twice the dimension along the vertical direction. 
     
     
         8 . The concrete beam according to  claim 1 , comprising an elastomeric band on each of the flanges. 
     
     
         9 . The concrete beam according to  claim 1 , comprising two lower bent metal plates at least at one of the longitudinal ends, which protrude inferiorly and laterally from the beam. 
     
     
         10 . The concrete beam according to  claim 1 , wherein the extensions have a depth between 3 and 10 cm. 
     
     
         11 . A construction system comprising a column, a prefabricated slab element and a beam according to  claim 1 , the column comprising a steel plate on which the end of the beam rests, the prefabricated floor element resting on one of the longitudinal flanges, preferably the steel plate having the shape of a rectangular ring. 
     
     
         12 . The construction system according to  claim 11 , wherein the plate has dimensions greater than the column in plan, and the column comprises transition corbels between the column and the plate, the corbels having a height ranging from 5 and 10 cm. 
     
     
         13 . The construction system according to  claim 9 , wherein the plate comprises hooks that emerge vertically from the plate and are arranged opposite to each other along the transverse direction, so that the hooks allow vertically retaining upper longitudinal reinforcements of the beams of the system and prevent the rotation or torsion of the beam during the assembly process, as a prefabricated floor element is placed on the beam at the opposite side to that on which the hook is arranged. 
     
     
         14 . A system according to  claim 9 , wherein the recesses with a rectangular floor plan have a depth along the longitudinal direction that is less than half the dimension of the plate along the longitudinal direction, so that concrete can be poured between the ends of successive beams and/or there is a space for hooks arranged in the middle part of the plate. 
     
     
         15 . The system according to  claim 9 , wherein the plate is joined to vertical reinforcements of the column, and preferably comprises elastomer bands on the support surfaces intended for the beams.