Building structure reinforcement method

IPC classes for russian patent Building structure reinforcement method (RU 2277620):

E04G23/02 - Repairing, e.g. filling cracks; Restoring; Altering; Enlarging

Another patents in same IPC classes:

Reinforcement method for reinforced concrete pillar with decreased load-bearing capacity / 2274719

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.

Method for building reconstruction and raising / 2265705

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Reinforcing structure for bendable reinforced concrete members / 2250325

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.

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Reinforcement method for reinforced concrete pillar with decreased load-bearing capacity / 2274719

Building structure reinforcement method / 2277620

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=S_BH-α·(T-T_a), where S_BH is distance between inner reinforcing member surfaces, α is linear expansion factor of fastening member material, T is fastening member heating temperature, T_a is ambient temperature. In the second case fastening member length is defined as L≥S_o, where S_o is distance between outer surfaces of reinforcing members.

Building structure water-tightness and waterproof covering recovery method / 2282007

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.

Method to recover water permeability and waterproof coating of building structures / 2283405

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.

Method for joint sealing with lead-based molten material / 2284400

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.

Method and kit to erect inserted structure between two existent buildings / 2292434

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.

Superstructure skeleton / 2305739

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.

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=S_BH-α·(T-T_a), where S_BH is distance between inner reinforcing member surfaces, α is linear expansion factor of fastening member material, T is fastening member heating temperature, T_a is ambient temperature. In the second case fastening member length is defined as L≥S_o, where S_o is distance between outer surfaces of reinforcing members.

EFFECT: increased reliability of structure to be reinforced.

4 dwg

The proposed method relates to the construction of production and can be used in the repair, such as beams, walls, columns or pillars in residential, industrial or public buildings.

Known reinforcing pier through the installation of metal corset (Wolfson V.L., Ilyashenko, VA, Komissarchik RG Reconstruction and repair of residential and public buildings: a Guide manufacturer's works. Vol. 2. - M.: stroiizdat, 2003, s.162...163). In this way the corners of the wall mount vertical metal corners (reinforcements) to the full height of the pier. On the surface of the pier punch grooves, in which is placed a metal plate (connecting elements). The ends of these plates are welded to the corners. This method of amplification is quite simple, it provides the opportunity to repair and reinforce the walls and beams, columns, poles, or other similar building structures. However, this method does not allow you firmly press the reinforcing elements to the surface of the reinforced structure. When any precision Assembly reinforcing and connecting elements remains the possibility of gaps between them and strengthened structure. Gaps may also appear during the operation of reinforced during thermal expansion of the reinforcing and connecting elements in the warm time of the year is, or when another random heat. Gaps will lead to discontinuity design in the area of amplification, which reduces its strength and reliability. The use of prior ties, clamps or spacers, providing a tight pressing of the reinforcing elements to the surface of the reinforced part is complicated tooling, will increase the complexity of operations to enhance the design and will not eliminate the likelihood of gaps, because it cannot compensate for thermal expansion of the reinforcing and binding elements.

Also known reinforcing steel columns clip (Huckin I.S. damage Diagnosis and recovery performance structures: a Training manual. - M.: Publishing house of the DIA, 2001, p.88...90), which is taken as a prototype. The prototype longitudinal elements of the clip (the reinforcing elements) of the angular steel mounted on a cement-sandy solution and pressed to the column by means of clamps. Then the corners are welded transverse bars (connecting elements)that are installed along the length of the column. Before welding these strips are heated to a temperature of 100...200°C. During cooling after welding of the strap shortened and create preliminary voltage.

Reinforcing columns on the prototype provides increased strength and reliability-enhanced design. However, heating of the connecting elements is on the prototype before they are installed on the reinforcing elements. After heating the connecting elements are superimposed on the reinforcing elements and sequentially welded to them. When welding the first end of the connecting element in its middle part and the other end is cooled. This cooling may not cause interference due to thermal contraction, because at this time the second end of the connecting element of the free. As a result, after welding the second end of the connecting element to the second amplifying element, the interference can be significantly reduced, which creates the possibility of gapping reinforcing elements to the surface of the reinforced structure. This will reduce the strength and reliability gain.

The technical result of the invention is to enhance reliability of the reinforced building structures by providing compression defective zone reinforcing elements.

The essence of the proposed method lies in the fact that the strengthening of building structures that have been damaged due to wear or during an emergency, make use of metal reinforcing elements, which are rigidly interconnected link elements, for example, by welding. The connecting elements is heated, after which it is rigidly connected with the reinforcing elements. Unlike the prototype, the connecting elements connect the first one of usilivaya the elements, then the connecting elements alternately heated and combined in a heated condition with the opposite reinforcing elements, after which the heating is ceased.

One of the options connecting elements inserted between the reinforcing elements. The original length of the connecting elements is determined from the expression L=S_NR-α(T-T_About), where S_NRthe distance between the inner surfaces of the reinforcing elements, α - the coefficient of linear expansion of the material of the connecting element, T is the heating temperature of the binder element, T_About- ambient temperature.

Alternatively the connecting elements are put on the ends of the reinforcing elements. In this case, the length of the connecting elements is chosen from the condition: L≥S_drugwhere S_drug- the distance between the outer surfaces of the reinforcing elements.

The invention is illustrated in the drawings, where figure 1 shows a variant of the proposed method when installing the connecting elements between the reinforcing elements, figure 2 is a top view of figure 1, figure 3 is a variant of the proposed method when applying the mortar to the ends of the reinforcing elements, and figure 4 is a top view of figure 3.

The proposed method in requiring strengthening building structures (for example, columns 1, as shown in figure 1 and 3) establish reinforce the existing elements 2 and 3, which are rigidly interconnected, particularly by means of welding, the connecting elements 4 and 5. The reinforcing elements 2 and 3, as well as the connecting elements 4 and 5 can be made of any metal, depending on the operating conditions of the building structure 1 and the value of operational loads on it. All of these elements can be in the form of angles, plates, bars and other types of specialized rental.

First, the connecting elements 4 and 5 is connected with one of the reinforcing elements, for example element 3, for example, imposing welds 6. Then the connecting elements 4 and 5 are alternately heated, for example, flame burner, in a heated condition connect by joints 6 opposite the reinforcing element 2, and then heating is stopped. As a result of heating the connecting elements 4 and 5 are extended, and upon further cooling after connecting them with the reinforcing elements 2 are shortened and tightly grip the reinforcing elements 2 and 3 to the surface of the building structure 1. This eliminates the possibility of formation of gaps between the surfaces of the building structure 1 and the reinforcing elements 2 and 3, which increases the strength and reliability of a design as a whole.

The connecting elements 4 and 5 can be established between the reinforcing elements 2 and 3 (Figure 1 and 2). In this case, the original length of the connecting elements is predelay from the expression L=S _NR-α(T-T_About), where S_NRthe distance between the inner surfaces of the reinforcing elements, α - the coefficient of linear expansion of the material of the connecting element, T is the heating temperature of the binder element, T_About- ambient temperature. Then when installing the connecting elements 4 and 5 between the reinforcing elements 2 and 3 items 4 and 5 will be in the initial state is shorter than the distance S_NRbetween the inner surfaces of the reinforcing elements 2 and 3. However, in the process of heating the connecting elements 3 and 4 their length will increase and will be equal to S_NRafter which their ends are connected with the reinforcing elements 2 and 3 welds 6.

Alternatively the connecting elements 4 and 5 are put on the ends of the reinforcing elements 2 and 3, and the original length of the connecting elements 4 and 5 is chosen from the condition L≥S_drugwhere S_drug- the distance between the outer surfaces of the reinforcing elements. The connecting elements are in this case just connect with one of the reinforcing elements (for example, item 3), then alternately heated and heated connect with the opposite reinforcing element 2, after which the heating is ceased.

Variants of the proposed method to the same extent ensure a tight pressing of the reinforcing elements 2 and 3 to the surface of the amplified build Inoi construction 1. The choice of options depends on the requirements for the appearance of the gain and the magnitude of the operational load of the reinforced building structure 1. At higher load better option in which the connecting elements 4 and 5 are put on the ends of the reinforcing elements 2 and 3, since in this case the welds 6 will work on the cut and will be able to withstand a higher load than in the first embodiment. Option in which the connecting elements 4 and 5 are inserted between the inner surfaces of the reinforcing elements 2 and 3, allows you to create a more compact and aesthetic enhancement of the building structure 1.

An example of the application of the proposed method can serve as a strengthening of reinforced concrete columns with local defects. When detected in the body of the column defect type vyrashivanii concrete or cracks on the area in which any defects installing the reinforcing elements 2 and 3 in the form of a steel angles, channels or plates so that covered these elements of the plot column 1 was larger than the area of the surface of the column 1, which is detected defects. The reinforcing elements 2 and 3 are pressed to the surface of the column 1 by clamps. From steel angles, rods or plates cut the connecting elements 4 and 5. Their original length depending on the selected option, the proposed method is determined from the expression L=S _NR-α(T-T_About), where S_NRthe distance between the inner surfaces of the reinforcing elements, α - the coefficient of linear expansion of the material of the connecting element, T is the heating temperature of the binder element, T_About- ambient temperature, or choose from the condition L≥S_drugwhere S_drug- the distance between the outer surfaces of the reinforcing elements.

Then the connecting elements are welded manual arc welding to one of the amplifying elements 3. Alternately heating the connecting elements 4 and 5 flame burner flame until the selected temperature in the range 100...300°and weld them to the opposite reinforcing element 2, imposing welds 6. After the welding of each joint of the connecting elements 4 and 5 with the reinforcing element 2 or 3 heating this connecting element is stopped.

After cooling, the connecting elements 4 and 5 are shortened and tighten the reinforcing elements 2 and 3, pressing them tightly to the surface of the column 1. This eliminates the possibility of the occurrence of gaps between the surface of the reinforced columns and reinforcing elements, prevents weakening of amplification, which increases the strength and durability of reinforced columns.

Thus, the proposed method of strengthening building structures provides a technical effect, Zack is causesa to increase the strength and reliability of the reinforced building structure. The method can be carried out using known in the art tools and materials. Therefore, the proposed method has industrial applicability.

Method of strengthening building structures of metal reinforcing elements, which are rigidly connected between the connecting elements and the connecting elements is pre-heated, and then connect with the reinforcing elements, characterized in that the connecting elements of the first link with one of the reinforcing elements, then the connecting elements are heated and heated connect with the opposite reinforcing element, and then heating is stopped, while the connecting elements or inserted between the reinforcing elements, or impose on the ends of the reinforcing elements, and the original length of the connecting elements when they insert between the reinforcing elements is determined from the expression L=S_NR-α(T-T_O), where S_BHthe distance between the inner surfaces of the reinforcing elements, α - the coefficient of linear expansion of the material of the connecting element, T is the heating temperature of the binder element, T_O- the ambient temperature, and when the connecting elements are put on the ends of the reinforcing elements, the original length of the connecting elements is chosen from the condition Lɥ S_drugwhere S_drug- the distance between the outer surfaces of the reinforcing elements.