Device to reinforce beam structures
SUBSTANCE: device to reinforce beam structures includes prestressed four-branch braced ties fixed at ends of the beam in its upper part, resting in areas of bending at hinged cylindrical supports with a pad, installed in the lower part of the beam and tightened by yokes. In the upper end zone of the beam there are angular profiles installed onto a footing, where braced ties are fixed as a tightened assembly.
EFFECT: increased bearing capacity due to balance of forces in all bands of a braced system.
2 cl, 4 dwg
The invention relates to the construction, namely the strengthening of beam structures maintained buildings.
In practice, the operation of beam structures, such as reinforced concrete beams, there is a need to strengthen them due to the increased pressures or because of defects.
A device for strengthening reinforced concrete beams, consisting of dvuhvetvevoj trussed torque, pridneprovem additional tension bands, with moveable legs (see a/with the USSR №1170097 CL E04C 23/02, 1985).
The drawbacks are the complexity of manufacturing, the need for a smooth, necessary for sliding of the movable supports, the bottom surface of the beam, it is difficult to ensure that operated in beams; in the zone of maximum bending moment there are only two working torque, two additional thrust play a role only tensioner that may be insufficient when zooming in on them operating load.
Know another device gain beams with prestressed wood bongs with additional prestressed elements in the passage area of the beam (see a/with the USSR №1434062 CL E04C 23/02, 1989).
A disadvantage of this device gain is the complexity of the prestress of separate tensioning devices (tension coupling the main strands and two delays is more cords), the inability to implement uniform tension cords.
The closest. the invention is a device for strengthening beams of four prestressed strands (see kN. Onufriev N.M. Simple ways of strengthening reinforced concrete structures for industrial buildings, L. - M.: Gastrolyzer, 1958. p.64-65 Fig.31).
The disadvantage of this device gain of the beam is the impossibility of uniform distribution of effort in the strands of the amplification device. This leads to an overload of one branch trussed system torque relative to another and reduces the overall carrying capacity and reliable operation of the amplification system.
The invention is aimed at improving the overall bearing capacity due to the alignment of efforts across all strands trussed system.
The result is achieved that the device for strengthening beam structures, including prestressed chetyrehvetvevymi trussed torque, attached to the ends of the beam in its upper part, supported in places knuckle hinge cylindrical supports with lining installed in the lower part of the passage zone of the beam and tightened the clamps according to the invention in the upper end zone of the beam is installed on Shorty, can be rotated angle profiles, in which the tensioning node is fixed trussed torque, while the hand is the shorties featu the wife in the center of the end face of the beam.
The result is achieved by the fact that the possibilities for accommodation chetyrehvetvevym cords in height the thickness of the lining of the cylindrical supports of the lower bands is made greater than the thickness of the lining of the supports of the upper strands of the value more than the diameter of the strands.
1 shows a device for the amplification of the beam structure; figure 2 attachment puffs in the upper part of the beam; figure 3 type And site of attachment of the puffs in the upper part of the beam in figure 4 node 1 in figure 1.
The amplified beam 1 with tense wood top 2 and bottom 3 puffs at the top end of the beam 1 is provided on the center of the Shorty 6 (short angular profile), which is based in the centre of the length of the angle profile 4, which stretch the node 5 is fixed torque 2 and 3. Corner profile 4 relies on Shorty 6, mounted on the end of the beam that provides the rotation angular profile 4 in two planes. The upper branch 2 in the span of the beam 1 is supported on a movable pivot bearing 7, and the bottom 3 on the supports 8. The upper branches of the fibers 2 in the lower part of the passage zone of the beam pulled one clamping collar 9, and the lower 3 - one or two clamps 9. For accommodation chetyrehvetvevym cords in height the thickness of the lining cylindrical supports 8 of the lower tie rod 3 is made greater than the thickness of the lining of the supports 7 of the top 2 strands of the value more than the diameter of the strand is.
Strengthening beam construction performed in the following sequence.
Perform installation of korotyshej 6 in the center of the upper end of the beam 1, and then produce the installation of corner profiles 4 hole corner profiles 4 insert the threaded upper ends of the fibers 2. In the lower part of the passage zone of the beam 1 set cylindrical bearing lining 7, tighten the ends of the branches 2 with nuts the tension of the node 5. Then at the bottom of the hole angular profiles 4 insert the threaded ends of the tie rod 3, establish cylindrical bearing lining 8, tighten the ends of the branches 3 to node 5. In the lower part of the passage zone of the beam 1 by tightening 2, 3 put the pinch clamps 9, create a preliminary voltage control its size. On the lower branch 3 can be worn two clamp 9.
This embodiment of the proposed device for strengthening beam structures in comparison with the known solutions enables you to evenly distribute the force of the tightening device, which prevents overloading of individual puffs and increases the overall carrying capacity of beams and reliability trussed amplification system.
1. Device for strengthening beam structures, including prestressed chetyrehvetvevymi trussed torque, attached to the ends of the beam in its upper part, supported in places re the IBA hinge cylindrical supports with lining, installed in the lower part of the passage zone of the beam and tightened the clamps, characterized in that, in the ends of the top beam set supported on the hand is the shorties can be rotated angle profiles, in which the tensioning node is fixed trussed torque, while the hand is the shorties are located in the center of the end face of the beam.
2. The device according to claim 1, characterized in that for pairwise placement chetyrehvetvevym cords in height the thickness of the lining of the cylindrical supports of the lower cords greater than the thickness of the lining of the supports of the upper strands of the value more than the diameter of the strands.
SUBSTANCE: invention relates to the field of construction, in particular to protection against oxidation of the active and passive frames laid in the concrete mass. A method of injecting fluid into a porous material or a material having boundary lines, comprising the following steps is revealed in the invention: attachment of an injector to the indicated material, which defines the boundaries of a compression chamber at least with one surface of the indicated material; injection of the indicated fluid into the indicated compression chamber under low pressure; influence on the indicated fluid by an acoustic wave of high power by means of an oscillating element, passing directly into the indicated compression chamber.
EFFECT: provision of deep impregnation of surfaces or boundary lines of heterogeneous materials.
14 cl, 3 dwg
SUBSTANCE: invention relates to methods of reinforcing power constructions, which have existing or predictable collapsing sections, by means of strips of composition material. As strips used is woven or non-woven reinforcing filling agent from glass, basalt, synthetic polymer or carbon fibres. Said fibres are impregnated with polymer composition in amount 30÷60% from composite weight, providing their adhesion to power constructions and further hardening from +5°C to +100°C for from 5 minutes to two days. Polymer composition contains in wt %: epoxy resin 100, active epoxy diluent 5÷130, hardening agent 15÷110, thickening agent 5÷50, pigment or dye 0.5÷50. As gardening agent it contains product of interaction of amine component with monocarboxylic acids. as amine component used is mixture, consisting of primary aromatic amine or mixture of aromatic amines (A), secondary aliphatic amino alcohol (B) and tertiary aliphatic amino alcohol (C) in weight ratio A:B:C from 98:0.2:1.8 to 80:5:15. Monocarboxylic acid (D) is introduced in form of 25÷80% solution in monoatomic aliphatic or aromatic alcohol, or their ether with mono- or dicarboxylic acid, in ratio (A+B+C):D from 90:10 to 60:40 counted per 100% acid with further interaction by mixing in reactor at temperature from 50 to 130°C for from 20 to 120 minutes at rate of mixer from 100 to 3000 revolutions per minute.
EFFECT: increased adhesion of reinforcing strips from composition materials to the surface of constructions and their more effective reinforcement are provided.
SUBSTANCE: in the method to repair a building facade, including dismantling, of at least a part of masonry of oil facing bricks and development of new masonry of facing bricks with fixation on the bearing wall of the building, according to the invention, development of new masonry and its fixation is done by fixing anchors in the bearing wall of the building, onto which horizontal rows of reinforcement are laid, on each of which, using mortar, they lay several rows of bricks with a gap relative to the bearing wall of the building, at the same time the first and last rows of the new masonry of facing bricks are arranged with horizontal ventilation gaps in respect to the old masonry. Besides, as the masonry is fixed onto the bearing wall of the building, in the specified gap they lay mortar in the form of vertical strips that connect areas of fixation of anchors, for additional fixation of bricks and elimination of anchor corrosion.
EFFECT: increased service life of a repaired facade of a building without change in its appearance, elimination of moisture condensation on a facing brick and in a facing brick due to formation of a ventilation gap in the facade, due to which a directed air flow from bottom up, which carries away warm moist air from a wall, preventing moisture condensation, increased service life of a facade happens due to suggested reliable fixation of facing brick masonry on a bearing wall of a building.
SUBSTANCE: reconstructed building includes the old building with foundation and upper overlapping, additional foundation located lengthwise outer perimeter of the old building, vertical columns located on additional foundation with at least one interfloor overlapping located above the old building, and overlapping installed on upper part of vertical columns and connected to them, and walls fixed between vertical columns. Reconstructed building contains in addition at least one load-bearing suspension located above the old building and connected to the mentioned overlapping. Additional foundation is made so that its loading is out of the area of power impact of the old building on the foundation. Overlapping is designed as load-carrying structure. Interfloor overlapping is connected to load-carrying structure by at least one load-bearing suspension, it is mounted in direction from load-carrying structure to upper overlapping of the old building and is designed with possibility of interaction with vertical columns.
EFFECT: improving operating reliability of reconstructed building.
SUBSTANCE: spacers of a steel shell are made in the form of a pair of angular stands and connection planks, which are fixed to each other by means of a welded joint in the form of a complex joint, at the same time the connection plank is made as a steel plate, dimensions and shape of the end and middle section of which is taken from the conditions of the bearing capacity of the plank and the welded joint.
EFFECT: higher reliability of operation of welded joints in a butt joint and overlapping, reduced metal intensity and higher fire protection of steel shell spacers to reinforce a column.
15 cl, 11 dwg
SUBSTANCE: device for reinforcement of ceiling with wooden beams includes metal beams along its whole length, mounted in the gaps between wooden beams. Bottom point of metal beams is located below the top of wooden beams with total inner dimension of the rest of ceiling. At metal beam top, a top rod band passing through a wooden beam and connected by supports with lower rod band is mounted, with the wooden beam resting on lower rod band over supporting plates.
EFFECT: enhanced structural capability of ceiling under reconstruction.
SUBSTANCE: device for ribbed concrete plate reinforcement includes relief angles connected to a channel attached to transverse rib of the plate and to V-shaped reinforcement element positioned under reinforced longitudinal ribs and fixated to heel joints by bolts. Surfaces of reinforced ribs facing the reinforcement element are notched along the whole height of rib and element contact area. Free space between reinforcement element and ribs is filled with stressed sand concrete.
EFFECT: enhanced structural capability of a structure.
SUBSTANCE: device to unload bearing walls of buildings comprises metal unloading stands installed in holes made between windows inside an unloaded wall and connected to each other by frames of window openings, each of which consists of angles arranged at the inner and outer side of the unloaded wall, tightened to each other by threaded braces. At the same time the metal stands of unloading rest onto an existing foundation strengthened with augercast piles.
EFFECT: invention provides for unloading of bearing walls of buildings.
SUBSTANCE: adhesive contains at least 100 pts.wt unsaturated polyester resin suitable for air drying, 1-5 pts.wt hydrogenated castor oil, 10-250 pts.wt filler and 1-15 pts.wt anti-shrinking agent.
EFFECT: material for filling stone cracks according to the invention has advantages such as good permeability and reduced shrinkage, no stickiness after hardening and a glossy surface after polishing.
11 cl, 15 ex
SUBSTANCE: spacer of a steel shell includes a pair of angular stands and connecting planks, which are fixed to each other by a welded joint in the form of a complex seam, at the same time the connecting plank is made in the form of a steel plate, dimensions and shape of the end and middle section of which are taken on the basis of conditions of the bearing capacity of the plank and the welded joint.
EFFECT: increased reliability of operation of welded butt and lapped joints.
15 cl, 11 dwg
FIELD: building, particularly for concrete structures reinforcing.
SUBSTANCE: structure includes trussed tie bar and additional compressed member. Structure is provided with telescopic post having spring. Post is arranged between trussed tie bar and compressed member formed of channel bar. Compressed member is located in level with lower belt of beam to be reinforced and encloses it. Trussed tie bar ends are connected to compressed member, which in turn is secured to beam to be reinforced by compressed member ends through collars.
EFFECT: increased load-bearing capacity, reliability and service life of reinforced concrete floor beams and longitudinal ribs of ribbed slabs, possibility of full residue bearing capacity usage of structure.
FIELD: building, particularly to prevent separation of roofing material layers during roof repair.
SUBSTANCE: method involves injecting material forming liquid bitumen layer in roof area of separation through orifices arranged in waterproofing mat above the area; consolidating the area to be repaired. Orifices are spaced 0.2-2.0 m apart. At the beginning of material injection process air or water is removed from the cavities through above orifices and then emulsified bitumen, including 30-80% of bitumen, is fed. Emulsified bitumen is spread in cavity over the full area of separation using weight, which is moved over the roof surface. Before compaction the area of separation is heated up to 100-160°C and then held at this temperature up to bitumen dewatering and water vapor discharge from the area through above orifices in atmosphere.
EFFECT: increased reliability of waterproofing mat gluing in presence of water cavities regardless of separation area and reduced time of roof repair.
FIELD: building, particularly building reconstruction.
SUBSTANCE: method involves forming main drilled piles along building foundation perimeter, where the piles are arranged outside the foundation; mounting the main load-bearing supports on the drilled piles so that load-bearing supports are arranged in pairs from opposite sides of the building; mounting load-bearing girders on load-bearing vertical support heads, wherein the bearing girders are arranged in rows; erecting additional stories on the bearing girders. Main drilled piles extend for depth not less than building foundation depth in ground. Upper pile parts are pulled together in pairs. Additional drilled piles adapted to support additional load-bearing vertical supports are driven outside the building foundation beyond the main ones. At least one additional load-bearing support is arranged in the main vertical support row from one building side.
EFFECT: prevention of service performance reduction.
16 cl, 2 dwg, 2 ex
FIELD: building, particularly to recover load-bearing capacity of reinforced concrete frames of industrial and civil buildings.
SUBSTANCE: method to recover load-bearing capacity of reinforced concrete column subjected to concrete and reinforcement corrosion by column surface moistening, scoring, column cross-section widening, enclosing with ferrule and reduction of longitudinal compressing force application eccentricity involves deforming steel pipe; reducing steel pipe cross-section by compressing thereof with two rollers to impart oval cross-section to the pipe so that major oval axis is equal to three minor axes; cutting the pipe in longitudinal direction; inserting damaged column in steel ferrule so that major cross-sectional axis is directed in plane of compressing force application eccentricity and reducing eccentricity; connecting two halves of oval pipe in air-tight manner and filling gaps between steel ferrule and damaged column with expanding fine concrete injected through nozzles in the cavities in bottom-top direction; compacting concrete with vibratory action and applying stress to cross-section during concrete setting by compressing thereof from all sides by steel form to reinforce the whole structure.
EFFECT: possibility to recover load-bearing building frame capacity without production process stopping and decreased labor inputs.
FIELD: building, particularly to repair beams, walls, columns and poles.
SUBSTANCE: method involves installing reinforcing members on structure to be reinforced and connecting the members with fastening members; welding the fastening members to one reinforcing member; heating thereof and welding the heated members to opposite reinforcing member; terminating the heating operation. The fastening members may be installed between reinforcing member surfaces or laid on ends thereof. In the first case initial fastening member length is determined from the following equation: L=SBH-α·(T-Ta), where SBH is distance between inner reinforcing member surfaces, α is linear expansion factor of fastening member material, T is fastening member heating temperature, Ta is ambient temperature. In the second case fastening member length is defined as L≥So, where So is distance between outer surfaces of reinforcing members.
EFFECT: increased reliability of structure to be reinforced.
FIELD: building, particularly roof repair and waterproofing.
SUBSTANCE: method involves arranging roof paper between coating area to be repaired and movable heating member; heating organic binding material to soften thereof by means of the heating member; compacting the coating along with rolling-on roofing paper to heated coating.
EFFECT: increase service life of waterproof covering.
5 cl, 1 tbl
FIELD: building, particularly to repair waterproof coatings and roof coverings including organic binding agent.
SUBSTANCE: method involves determining brittle temperature of organic binding agent; calculating plastic range thereof; heating organic binding covering with heating member laid on the covering and compacting the covering. The organic binding agent is heated up to temperature 1.6-3.2 times greater than plastic range.
EFFECT: increased service life of repaired coating and increased quality thereof.
FIELD: repairing, for instance filling cracks, restoring, altering, enlarging, particularly for repairing monuments, museum pieces and applied and decorative art pieces.
SUBSTANCE: method involves drying joint and filling thereof with dry non-combustible materials before lead-based molten material pouring in joint; filling the joint with lead-based molten material, which is supplied through pouring channel system made of molding material, wherein the molding material provides predetermined geometry of sealed joint. The molten material is supplied as continuous jet. Joint to be sealed may be located in vertical or horizontal planes or in plane inclined at 0-90° angle with respect to horizontal plane. The lead-based molten material may be reused for repairing work performing.
EFFECT: reduced labor inputs and material consumption, increased environmental safety and joint sealing reliability, elimination of additional mechanical or chemical treatment.
17 cl, 2 dwg
FIELD: construction, particularly building reconstruction.
SUBSTANCE: method involves erecting foundation of inserted structure, forming through pass in-between and constructing one or several stories over the foundation. The stories are built of kit including vertical panels and floor panels, which are connected with existent building walls by tie members. Joints are hermetically sealed. Floor panels are installed on guiding means having opened parts. Opened parts of guiding means are welded with each other after structure assemblage. Roofs of adjacent buildings are extended up to inserted structure walls. Projection adapted to drain water from the structure is hermetically installed over joint between the roof and the inserted structure. Guiding means are made as outer centralizers in upper parts of vertical and floor panels and as inner centralizers in lower panel parts.
EFFECT: increased strength and air-tightness.
12 cl, 14 cl, 2 ex
FIELD: construction, particularly working measures on existing buildings.
SUBSTANCE: superstructure skeleton comprises lower row transversal frames arranged within the limits of building length and lower end transversal frames projecting out of the building length and including two belts. The end transversal frames have columns and trusses located from building outside and provided with parallel belts. Arranged in the trusses are upper row and end frames having two belts and including columns and trusses. Skeleton also comprises floor panels. Lower superstructure stories are provided with central columns installed in lower frame truss joints and are united with each other by structural stands of intermediate stories. Space of one intermediate story is free of frame structures. Main beams of upper intermediate stories are secured to upper frame trusses by means of suspension brackets.
EFFECT: decreased metal consumption of superstructure skeleton.