RU22162U1 - MONOLITHIC PRELIMINARY STRESS NON-KEYBOARD BUILDING FRAME - Google Patents

Description

Monolithic prestressed bezelless

building frame.

The invention relates to building structures, namely to frame buildings and structures with tension reinforcement in construction conditions.

Known frame system IMS for the construction of residential buildings and public buildings, containing columns, ceilings, prestressed fittings,

laid between overlapping panels in mutually perpendicular directions, passed through openings in columns and monolithic with concrete / 1 /.

The closest construction is the prestressed monolithic reinforced concrete frame of the building, including columns, floors, and prestressed reinforcement located in the channels of the overlapping in mutually perpendicular directions

The disadvantages of the known designs are the complexity and the complexity of the erection of the frame due to the busyness of the operation of placing and tensioning the reinforcement in the body of the ceiling, the difficulty of placing hollow formers in the formwork, as well as the need to inject concrete in the channels and filling the joints after tensioning the reinforcement.

The technical task is to reduce the time of construction of buildings due to the possibility of increasing spans while maintaining the thickness of the floor and reducing weight and simplifying the work when tensioning the reinforcement and concreting.

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The technical problem is solved in such a way that in a monolithic prestressed bezelless frame, including columns, floors, and located in the channels of the floor in mutually perpendicular directions, the prestressed reinforcement according to the invention, the prestressed reinforcement is freely movable in the channels formed by the tubes, and placed in the body of the ceiling in accordance with the diagram of moments with a radius of curvature along the axis of the column equal to 2-3 column widths, and in the middle flight with a radius of curvature equal to 5-10 span lengths. Moreover, the overlap can be performed open. In this case, the overlap can be additionally equipped with rectilinear prestressed reinforcement

The proposed design differs from the known one in that the prestressed reinforcement is freely movable in the channels formed by the tubes and is placed in the overlapping body in accordance with the diagram of moments with a radius of curvature along the axis of the column equal to 2-3 column widths and a radius in the middle of the span curvature equal to 5-10 span lengths.

Pre-stressed reinforcement consists of rope reinforcement placed freely in the tube and located along the curve of the diagram of overlapping moments in the span with a radius of curvature (R) with a minus sign and on a support (in a column) with a radius of curvature (g) with a plus sign. This outline of the location of the reinforcement over the overlapping section determines the transmission of the vertical component of the tension force.

directed downward directly to the supports, and in the span - along the trajectory of the stress diagram, fully absorbing the bending forces.

The curved shape of the tensioned reinforcement above the column with a radius of curvature equal to 2-3 times the width of the column is taken in such a way that the resultant downward force of the reinforcement balances the reactive forces arising in the column, which can cause a burst in the plate. The deflection height of the prestressing reinforcement in the span with a radius of curvature equal to 5-10 span lengths is chosen so that the intensity of the vertical components along the span corresponds to the load intensity. Overlappings can be made flat, flared or step-flared.

A rectilinear prestressed reinforcement (without bends) is additionally placed in the supracolumnar strip of the collapsed overlap along the edges in the zone of perception of the spacer forces.

The free placement of reinforcement in the tubes facilitates the production of reinforcing work and eliminates the need for the operation of filling the channels with concrete.

Figure 1 presents the prestressed concrete frame of the building; figure 2 - aa figure 1; Fig.Z - nodeB of Fig.2. figure 4 is the same as in figure 1 option with the expanded overlap; Fig.3 - AA figure 4; 6 - BB figure 4.

The prestressed reinforced concrete frame of the building includes columns 1, floor 2, prestressed reinforcement 3 placed in tubes 4 along the floor section and additional reinforcement 5. (see figure 4)

Pre-stressed frame is constructed as follows.

Install the reinforcing cage and vertical formwork for the construction of columns 1 and horizontal formwork of the ceiling 2. In the horizontal formwork between the columns around the cell perimeter, lay tubes 4 with reinforcement 3 placed in them. When using the expanded structure of the overlap, tubes 4 with reinforcement 5 are placed at the edges, placing it straightforwardly. In the upper overlap zone above the columns, non-tensioning reinforcement is placed since the reference moments of the overlap are greater than the span. After this, concreting columns 1 and floors 2 and exposure to concrete hardening. After that, the reinforcement is tensioned with 3 hydraulic jacks and the fixing along the ends of the floor overlap and the formwork are removed.

When erecting the proposed design, the cost of the building is reduced due to the simplification of the work and the reduction of material consumption.

Sources of information:

1.ST. B. Koprivitsa “The use of the IMS frame system for the construction of residential and public buildings, housing construction, M, 1984, No. 1, p.30-32.

2. RF patent 32133802, class E04V1 / 18, BI№21. 1999. / prototype /.

Claims (3)

1. Monolithic prestressed bezel-free frame of the building, including columns, floors and prestressing reinforcement located in the overlapping channels in mutually perpendicular directions, characterized in that the prestressed reinforcement is freely movable in the channels formed by the tubes and is placed in the ceiling body in accordance with a plot of moments with a radius of curvature along the axis of the column equal to 2-3 column widths, and in the middle of the span with a radius of curvature equal to 5-10 lengths span.  2. The monolithic prestressed bezelless frame of the building according to claim 1, characterized in that the overlap is made open. 3. A monolithic prestressed bezel-free frame of a building according to claim 2, characterized in that the ceiling is additionally provided with rectilinear prestressed reinforcement.