RU2012109955A - METHOD FOR STRENGTHENING THE COLUMN AND COMBINED ELEMENTS OF THE OVERLOAD OF THE BUILDING - Google Patents

Abstract

1. The method of reinforcing the columns and articulated elements of the building floor, including conducting a technical inspection of the articulation of the elements, performing verification calculations of the elements of the reinforcement device for strength, designing and manufacturing elements of the amplification device, installing them on the articulating elements of the building floor, the voltage of the racks of the steel cage with adjustable effort with subsequent compression and concreting, characterized in that the spacer unit of the amplification device installed in the upper part of the reinforced columns s, they are made of a supporting table and steel combs, consisting of thrust plates and cargo screws and forming a tee weld between them, which include simultaneously working with two opposite faces of the reinforced column, articulated with the building floor slabs. 2. The method according to claim 1, characterized in that the steel comb of the spacer assembly is in the form of a welded T-joint of the cargo screws directly to the lower surface of the thrust plate. The method according to claim 1, characterized in that the steel comb of the spacer unit is made in the form of a welded T-joint of the cargo screws with the thrust plate and the release of anchors through the countersink holes. The method according to claim 1, characterized in that the steel comb of the spacer unit is made in the form of a fastening bolt connection of cargo screws equipped with a shoulder with a thrust plate and the release of anchors through holes in the thrust plate. The method according to claim 1, characterized in that the cargo screw is made in the form of a short length of a steel rod, equipping one end with a threaded thread, tension nuts, �

Claims (21)

1. The method of reinforcing the columns and articulated elements of the building floor, including conducting a technical inspection of the articulation of the elements, performing verification calculations of the elements of the reinforcement device for strength, designing and manufacturing elements of the amplification device, installing them on the articulating elements of the building floor, the voltage of the racks of the steel cage with adjustable effort with subsequent compression and concreting, characterized in that the spacer unit of the amplification device installed in the upper part of the reinforced columns s, they are made of a supporting table and steel combs, consisting of thrust plates and cargo screws and forming a tee weld between them, which are included in the work simultaneously with two opposite faces of the reinforced column articulated with the building floor elements. 2. The method according to claim 1, characterized in that the steel comb of the spacer unit is made in the form of a welded T-joint of the cargo screws directly with the lower surface of the thrust plate. 3. The method according to claim 1, characterized in that the steel comb of the spacer unit is made in the form of a welded T-joint of the cargo screws with the thrust plate and the release of anchors through the countersink holes. 4. The method according to claim 1, characterized in that the steel comb of the spacer unit is made in the form of a fastening bolt connection of cargo screws equipped with a shoulder with a thrust plate and the release of anchors through holes in the thrust plate. 5. The method according to claim 1, characterized in that the cargo screw is made in the form of a short length of a steel rod, equipping one end with a threaded thread, tension nuts, washers and a lock nut. 6. The method according to claim 1, characterized in that the cargo screw is made in the form of a piece of steel rod, equipping one end with a threaded thread, tension nuts, washers and a lock nut; the other end is equipped with a shoulder, fixing thread, nut and washer. 7. The method according to claim 1, characterized in that the cargo screw is made in the form of a piece of steel rod, including the length of the anchor, equipping one end with a threaded thread, tension nuts, washers and a lock nut; the other end is equipped with an anchor. 8. The method according to claim 1, characterized in that in the manufacture of a welded T-joint of the cargo screw with the thrust plate of the spacer unit, submerged arc welding is used. 9. The method according to claim 1, characterized in that in the manufacture of a welded T-joint of the cargo screw with the thrust plate of the spacer unit, resistance welding and continuous fusion are used. 10. The method according to claim 1, characterized in that in the manufacture of a welded T-joint of the cargo screw with the thrust plate of the spacer unit, arc welding into a countersink hole is used. 11. The method according to claim 1, characterized in that the thrust plate of the spacer unit is made of a piece of corrugated strip steel. 12. The method according to claim 1, characterized in that the thrust plate of the spacer unit is attached directly to the concrete of the lower edge of the floor element by dipping into the juice of a plastic cement-sand mortar with squeezing. 13. The method according to claim 1, characterized in that the thrust plate of the spacer unit is attached to the floor element by installing cargo screw anchors in grooves 60 mm deep that are drilled in the concrete of the lower face of the floor element. 14. The method according to claim 1, characterized in that the thrust plate of the spacer unit is fixed to the exposed bottom reinforcement of the reinforced concrete floor element by contact spot welding. 15. The method according to claim 1, characterized in that, provided that the tensioned racks of the steel cage are included in the operation, the coefficient of the reinforced concrete working conditions of the reinforced column is taken without lowering it, m _b = 1.0. 16. The method according to claim 1, characterized in that when concreting, the thickness of the cladding layer is δ _oz , mm, with a guaranteed limit of fire protection of the insulation coating for the steel reinforcement element, it is determined by the logarithmic formula (1): $${\delta }_{\mathrm{about}s\mathrm{from}}=\ln {\tau }_{\mathrm{to}\mathrm{and}P}\cdot D_{ar}^{0.8}$$

; where δ _oz - the thickness of the fire-retardant layer of the cladding, mm; τ _bale - guaranteed limit of fire protection of the insulating coating, min; D _ar is an indicator of thermal diffusion of the cladding material, mm ² / min. 17. The method according to claim 1, characterized in that the cross-sectional dimensions of the support table, reinforced with stiffeners, are taken according to the results of checking the strength of the racks and waist sheets of bent steel elements. 18. The method according to claim 1, characterized in that the diameter of the cargo screws and their number are determined by strength and stability, depending on the magnitude of the unloading force of the reinforced concrete column. 19. The method according to claim 1, characterized in that the surfaces of the thrust plate mating with the support of the crossbar are subjected to firing by burners and they are insulated into the juice of a plastic solution with squeezing. 20. The method according to claim 1, characterized in that the height of the welded flank seam connecting the elements of the reinforcement device is assumed to be shear and bend, but not less than 6 mm. 21. The method according to claim 1, characterized in that after the introduction of the prestressing spacers into operation, the lower face of the thrust plate and the top of the support table are connected with a metal plate or a corner piece using contact spot welding.