Shear Reinforcing Space Grid of RC Structural Members

摘要

Reinforcement of shear strength of concrete is reinforced by reinforcing bars (strip or stirrup) that holds the main bars in columns and beams among reinforced concrete structural members, but floor slabs, walls, and foundations are generally reinforced without using shear reinforcement. It is the practice to solve by increasing the compounding strength or thickness of the solution. Since the main stress of the floor slab and the wall is the bending moment and the shear pressure is required at the lower part of the deep basement wall, which is particularly high in earth pressure and water pressure, the present invention mainly focuses on the foundation reinforcement. The foundation is characterized by a large supporting load per unit area, so that the shear force around the column or bearing wall is large. Therefore, the thickness of the foundation is thick, even in the foundation of more than 1m thick reinforcing bar that resists the bending moment only in the lower part is not considered strange even if there is no rebar in the rest. Sometimes attempting to reinforce the stirrup (vertical rebar) to reduce the thickness of the foundation is not easy to reinforce the site because there is no reinforcing bar to hold it on the upper part of the foundation [Fig. 4]. Therefore, even if the rebar is placed on the upper part of the foundation, there is no work scaffold needed to close the vertical stirrups between the upper and lower rebars, and the hand does not enter the narrow space between the upper and horizontal rebars. It is also impossible to tie. Therefore, if the worker enters sideways between the up and down rebars, the thickness of the foundation is too thin to tie the strands one by one, and it is burdensome to reflect them in the design because there is no experienced person [Fig. 5]. Since the shear reinforcement of the horizontal member corresponds to the sinusoidal tension, even if the reinforcement effect is the same even in the vertical or horizontal direction, even structural experts recognize that the stirrup should be reinforced in the vertical direction [FIG. 7]. Nevertheless, the present inventors have already applied for a horizontal shear reinforcement method but have realized again how difficult it is to break the stereotypes of related engineers as expected. In addition, technicians who reinforce reinforcement at the construction site should avoid the propagation of new methods that are not familiar with most foreign technicians.;Based on the present conditions and conditions, in the present invention, the foundation or flat plate concrete around the column or bearing wall is constrained by a grid of reinforcing grids of left and right tetrahedral cubes in small units. To exert [Fig. 1]. Reinforced concrete structure is arranged only in one direction or two direction to bind the binding line, but the reinforcement of the present invention is differentiated from the factory welding by arranging the three-dimensional grid. This is because FERRO CEMENTO or wood plywood exhibits particularly excellent structural performance compared to general reinforced concrete or natural wood. The flat shape of the shear reinforcing three-dimensional grid is the same as 30cm * 30cm, and the height is changed in units of 10cm as the thickness of the foundation changes. The standard of the shear reinforcing three-dimensional grid is unified to one of the above in order to simplify the description and the standard can be varied according to the situation.