WO2018139912A1 - A reinforcement for a horizontal reinforcing of a masonry and a method of production thereof - Google Patents

A reinforcement for a horizontal reinforcing of a masonry and a method of production thereof Download PDF

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Publication number
WO2018139912A1
WO2018139912A1 PCT/MD2017/000007 MD2017000007W WO2018139912A1 WO 2018139912 A1 WO2018139912 A1 WO 2018139912A1 MD 2017000007 W MD2017000007 W MD 2017000007W WO 2018139912 A1 WO2018139912 A1 WO 2018139912A1
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WIPO (PCT)
Prior art keywords
reinforcement
masonry
thickness
strip
lintels
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PCT/MD2017/000007
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French (fr)
Inventor
Nicolai BOGUSLAVSCHI
Chester WRIGHT
Arkady ZALAN
David Braylyan
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TS-Rebar Holding LLC
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Publication of WO2018139912A1 publication Critical patent/WO2018139912A1/en

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C1/00—Building elements of block or other shape for the construction of parts of buildings
    • E04C1/40—Building elements of block or other shape for the construction of parts of buildings built-up from parts of different materials, e.g. composed of layers of different materials or stones with filling material or with insulating inserts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/02—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls built-up from layers of building elements
    • E04B2002/0256—Special features of building elements
    • E04B2002/028—Spacers between building elements
    • E04B2002/0282—Separate spacers
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance

Definitions

  • the invention relates to building structures, in particular, to a reinforcement for horizontal reinforcing of a masonry of such materials as, for example, bricks, blocks of heavy, light or cellular concrete, blocks of a natural stone, and it can be used in construction of buildings of a different purpose, mainly in earthquake-prone areas.
  • Such reinforcement is intended for perception and compensation of bend-tension loadings, which occur in the masonry during eccentrical loading, including during seismic impacts on the building.
  • the reinforcement [1] is known that is stacked in horizontal mortar joints between tiers of a stone masonry not less than by 400 mm according to the masonry height.
  • Such reinforcement is a cross grid with rectangular cells of 0 rods (3 ... 4) mm, or a grid of a "zigzag" type of rods > 0 of 6 mm. In both cases rods of the grid are welded with an overlap.
  • longitudinal rods of a reinforcement grid which are arranged in a proximity to one of wall surfaces, act for tension, and the ones, which are arranged in a proximity to another surface, act for compression.
  • the longitudinal rods of the grid which are arranged in a central part of the wall, almost do not perceive loads.
  • the rods which are arranged perpendicular to the wall thickness, serve only for transferring shearing loads to the reinforcement from masonry solution, wherein the rods almost do not perceive loads, while only welded points work for shearing.
  • the claimed invention aimed to decrease the weight of a reinforcement for horizontal reinforcing of a masonry, labor input and a material consumption of production thereof and, thus, cost, with simultaneous increase in strength properties of the masonry and improvement of heat-insulating properties of a wall.
  • the objective is solved by the fact that a reinforcement for horizontal reinforcing of each given tier of the masonry is made as a grid representing a strip including two flat longitudinal zigzag-shaped rods and made integrally with lintels lying in the same plane with longitudinal rods, wherein the distance between longitudinal rods is in the range of 25 - 50 mm, distance between lintels is in the range of 75 - 120 mm, and the pitch of deflection of said zigzags is 5 - 10 mm.
  • a method of production of a reinforcement for horizontal reinforcing of a masonry from a strip of sheet steel having a thickness of 0,5 - 1 ,4 mm lies in that this strip in a stamp of a consecutive action at the first step is cut off along the outline making external grooves, at the second step internal S-shaped grooves are punched, at the third step walls of external and internal grooves are mounted providing them with a U-shaped form, at the fourth step vertical walls are dismounted, thereby creating a two-layer section of each reinforcement element, at the fifth step the workpiece is expanded in the longitudinal direction.
  • a method of production of the reinforcement for reinforcing of a masonry from a : strip of sheet steel having a thickness of 1 ,5 - 2,5 mm lies in that this strip in a stamp of . a consecutive action at the first step is cut off along the outline making external grooves, at the second step internal S-shaped grooves are punched, at the third step it is expanded in the longitudinal direction up to a given size.
  • a method of arrangement of a reinforcement for horizontal reinforcing of a masonry lies in that mesh strips are arranged in each tier of the masonry in pairs along edges of a wall, wherein the distance from an external rod of the strip to the corresponding edge of a wall is 5...15 mm.
  • a technical effect lies in decrease of weight of the reinforcement, reduction of labor input of production thereof, reduction of thickness of a mortar layer, wherein the reinforcement is arranged, in increase of strengthening properties of the reinforcement, in prevention of deterioration of thermal insulating properties of a wall, and, eventually, in increase in economic efficiency of the construction.
  • V - dismounting walls providing doubled thickness of edges of a reinforcement strip
  • stages IY and Y are absent.
  • the reinforcement for a horizontal reinforcing represents a mesh strip including two flat zigzag-like longitudinal rods (1), which are connected by the lintels (2) lying in the same plane with longitudinal rods and made integrally wit them, wherein the distance between longitudinal rods is in the range of 25...50 mm, while distance between lintels is in the range of 75...120 mm, wherein joints of the longitudinal rods with lintels are made by radiuses, which are not less than half of thickness of a sheet, from which the reinforcement is made, while the pinch of deflection of said zigzags is 5...10 mm.
  • the zigzag-like shape of longitudinal rods allows to distribute the load perceived by them regularly along the entire length of the rods, and not just to transfer it to the rod in points of junctions with the lintels.
  • Joints of the longitudinal rods with lintels are made by radiuses, which are not smaller than half of thickness of the sheet, from which the reinforcement is made.
  • the reinforcement is made of sheet steel having a thickness of 0.5 - 2.5 mm;
  • the reinforcement is textured by creation of protrusions of a random shape on faces thereof, for example, in the form of a direct or mesh corrugation.
  • Height of the created protrusions can be 0.1...0.3 of the from metal thickness.
  • Ki - coefficient considering allowed damages of buildings that equals in our case to 0.25 [14, table 3, item 2];
  • Soik -value of the earthquake load for i-th tone of natural oscillations of the building that is determined assuming elastic deformation of structures by a formula
  • Soik Qk-A-prK Struktur,-r] j k, where
  • the method of production of a reinforcement for horizontal reinforcing of a masonry from a strip of sheet steel having a thickness of 0.5 - 1.4 mm lies in that this strip in a stamp of a consecutive action at the first step is cut off along the outline making external grooves (3), at the second step internal S-shaped grooves (4) are punched, at the third step walls of external and internal grooves are mounted providing ,, them with a U-shaped form, at the fourth step vertical walls are dismounted, thereby i creating a two-layer section of each reinforcement element, at the fifth step the X workpiece is expanded in the longitudinal direction.
  • the method of production of the reinforcement for reinforcing of a masonry from a strip of sheet steel having a thickness of 1.5 - 2.5 mm lies in that this strip in a stamp of a consecutive action at the first step is cut off along the outline making external grooves (3), at the second step internal S-shaped grooves (4) are punched, at the third step it is expanded in the longitudinal direction up to a given size.
  • a sheet of plastic steel for example, of a cold- olled brand of 08 kp having a thickness of 2.0 mm, is cut for strips having a width of 40 mm, which in a stamp of a consecutive action are subjected to the following operations: cutting off an external outline making external grooves; punching internal grooves; expanding the workpiece up to production of a grid having rectangular openings 30 x 75 mm.
  • lintels are made straight and longitudinal rods are zigzag-shaped having a pitch of deflection being 5...10 mm.
  • Steps of manufacturing of the reinforcement are presented on fig. 1.
  • the stamped reinforcement is subjected to cold hardening, for example, passing it through rollers, wherein thickness of the reinforcement decreases by (10...30) %.
  • both surfaces of the reinforcement are textured applying, for example, a direct cross corrugation, which additionally increases engagement of the reinforcement with masonry solution.
  • burrs which appear during dividing operations of stamping in the process of wearing of cutting edges of punches and stamp matrix, are swaged.
  • Said method of production of the reinforcement allows to receive about three meters of a final reinforcement from each running meter of the workpiece.
  • the reinforcement is coated with zinc or made of a sheet that is pre- coated with zinc.
  • the described production scheme allows to minimize amount of the metal that is removed to a waste.
  • the specified sizes of the reinforcement are approximate and can vary depending on material and thickness of the wall, as well as on estimated loads onto 1 walls of the building.
  • the method of arrangement of the reinforcement in the masonry of the wall of the building lies in that mesh strips are arranged in each tier of the masonry in pairs along edges of the masonry, wherein the distance from an external rod of the strip to the respective edge of the masonry is 5...15 mm.
  • Such arrangement of the reinforcement is caused by behavior of the horizontal reinforcement in the masonry upon seismic impact thereon.
  • the distance from the external rode of the strip to the respective region of the masonry is less than 5 mm, in case of seismic impact the reinforcement can push out solution outside, and the wall will collapse. If it is more than 15 mm, the overall operational performance of the reinforcement will decrease in view of its proximity to an idle central (neutral) area of the wall.
  • the reinforcement that is arranged in such a way is well connected with the masonry and perceives the bend-tension loads of the wall occurring in the process of using the building in an optimal extent.
  • the suggested reinforcement provides increased load capacity and vibration resistance of the wall.
  • the claimed reinforcement has weight and labor input of production, which are smaller than of the reinforcement of any known type.
  • the reinforcement made according to the invention and arranged in the mentioned way is well connected with the masonry and perceives the bend-tension loads of the wall occurring in the process of using the building in an optimal extent, without worsening the heat-insulating properties of the wall.
  • the suggested reinforcement is completely compliant with the requirements of the existing construction regulations and outstanding cost efficiency.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

The invention relates to building structures, in particular, to a reinforcement for horizontal reinforcing of a masonry of such materials as, for example, bricks, blocks of heavy, light or cellular concrete, blocks of a natural stone, and it can be used in construction of buildings of a different purpose, mainly in earthquake-prone areas. Such reinforcement is intended for perception and compensation of bend-tension loadings, which occur in the masonry during eccentrical loading, including during seismic impacts on the building. A reinforcement for a horizontal reinforcing of a stone masonry made as a grid being a strip including two flat longitudinal rods, which are connected by the lintels, wherein the longitudinal rods are zigzag-shaped and made integrally with the lintels lying in the same plane with the longitudinal rods, wherein the distance between the longitudinal rods is in the range of 25...50 mm, while the distance between the lintels is in the range of 75...120 mm, while the pinch of deflection of said zigzags is 5...10 mm. All joints of the longitudinal rods and lintels are rounded by a radius that equals to at least a half of thickness of metal from which the reinforcement is made. The faces thereof are provided with protrusions of any shape, for example, in the form of a direct or mesh corrugation, wherein the height of the protrusions is 0.1...0.3 of the metal thickness. A method of production of the reinforcement for horizontal reinforcing of a masonry, the method lies in making grooves in a strip of sheet steel with further expanding of the resulting grid, wherein the strip of sheet steel having a thickness of 1.5...2.5 mm in a stamp of a consecutive action at the first step is cut off along the outline making external grooves, at the second step internal S-shaped grooves are punched, at the third step it is expanded in the longitudinal direction up to a given size.

Description

A REINFORCEMENT FOR A HORIZONTAL REINFORCING OF A MASONRY AND A METHOD OF PRODUCTION THEREOF
The invention relates to building structures, in particular, to a reinforcement for horizontal reinforcing of a masonry of such materials as, for example, bricks, blocks of heavy, light or cellular concrete, blocks of a natural stone, and it can be used in construction of buildings of a different purpose, mainly in earthquake-prone areas. Such reinforcement is intended for perception and compensation of bend-tension loadings, which occur in the masonry during eccentrical loading, including during seismic impacts on the building.
The reinforcement [1] is known that is stacked in horizontal mortar joints between tiers of a stone masonry not less than by 400 mm according to the masonry height. Such reinforcement is a cross grid with rectangular cells of 0 rods (3 ... 4) mm, or a grid of a "zigzag" type of rods > 0 of 6 mm. In both cases rods of the grid are welded with an overlap.
However the known steel reinforcement, while strengthening the masonry, simultaneously sharply worsens heat-insulating properties of a wall. It is caused by a presence of elements in the reinforcement, which are located perpendicular to the plane of walls and extending almost through the entire thickness of the wall. Thermal conductivity coefficient of material of these rods is greater by more than 400 times than thermal conductivity coefficient of material of the wall. So, thermal conductivity coefficient of the structural steel is λ = 58 W / (m °C), while for the constructional and thermal insulating cellular concrete having a density of 600 kg/m3, which is widely applied to construction of envelope structures of buildings, it is 0,14 W/(m °C).
Furthermore, since thickness of cross grids, which are made of 0 rods (3... ) mm, is 5...7 mm, each second mortar joint according to the wall height is thickened up to 10...15 mm. In turn, thermal conductivity coefficient of masonry solution is approximately four times higher than the cellular concrete has (CP E.04.05-2006 Proiectarea protectiei termice a cladirilor, anexa D).
Therefore, the essential deterioration in thermal uniformity of walls that is caused by a presence of cross rods of a masonry reinforcement is aggravated with a thickening
l of each mortar layer, in which this reinforcement is arranged. Combined influence of both these factors cause a necessity for additional thermal insulation of walls, and, therefore, lead to lengthening of terms of a construction and to cost rising thereof.
In the conditions of perception of bend-tension loads by a wall of a building, the loads being directed perpendicular to the wall, longitudinal rods of a reinforcement grid, which are arranged in a proximity to one of wall surfaces, act for tension, and the ones, which are arranged in a proximity to another surface, act for compression. The longitudinal rods of the grid, which are arranged in a central part of the wall, almost do not perceive loads.
The rods, which are arranged perpendicular to the wall thickness, serve only for transferring shearing loads to the reinforcement from masonry solution, wherein the rods almost do not perceive loads, while only welded points work for shearing.
The described drawbacks are significantly greater in the standard grid of a "zigzag" type. Therefore, it is almost not used.
A large number of attempts to reduce a material consumption of reinforcement grids of such type with simultaneous increase of their strengthening properties, tot improve their technological and operational parameters [2-14] is known.
The following drawbacks are peculiar to all of these solutions: essential deterioration of the heat-insulating ability of a wall as well as presence of the reinforcement in a central part of a wall, which do not increase strength of a masonry and leading to an unjustified consumption of metal.
The closest one among the known ones is technical solution [15].
In the specified prototype the drawbacks, which are peculiar to the known solutions, are eliminated. However the strengthening capability of such reinforcement is not sufficiently high in view of straightness of longitudinal rods thereof.
Besides, production of a masonry reinforcement according to [15] requires carrying out operations of dividing and shape-generating on various equipment that leads to a presence of intermediate storage, additional equipment and additional workers. A material consumption of the reinforcement of [15] is high as well in view of a small step of lintels along the reinforcement length.
The claimed invention aimed to decrease the weight of a reinforcement for horizontal reinforcing of a masonry, labor input and a material consumption of production thereof and, thus, cost, with simultaneous increase in strength properties of the masonry and improvement of heat-insulating properties of a wall. The objective is solved by the fact that a reinforcement for horizontal reinforcing of each given tier of the masonry is made as a grid representing a strip including two flat longitudinal zigzag-shaped rods and made integrally with lintels lying in the same plane with longitudinal rods, wherein the distance between longitudinal rods is in the range of 25 - 50 mm, distance between lintels is in the range of 75 - 120 mm, and the pitch of deflection of said zigzags is 5 - 10 mm.
A method of production of a reinforcement for horizontal reinforcing of a masonry from a strip of sheet steel having a thickness of 0,5 - 1 ,4 mm lies in that this strip in a stamp of a consecutive action at the first step is cut off along the outline making external grooves, at the second step internal S-shaped grooves are punched, at the third step walls of external and internal grooves are mounted providing them with a U-shaped form, at the fourth step vertical walls are dismounted, thereby creating a two-layer section of each reinforcement element, at the fifth step the workpiece is expanded in the longitudinal direction.
A method of production of the reinforcement for reinforcing of a masonry from a : strip of sheet steel having a thickness of 1 ,5 - 2,5 mm lies in that this strip in a stamp of . a consecutive action at the first step is cut off along the outline making external grooves, at the second step internal S-shaped grooves are punched, at the third step it is expanded in the longitudinal direction up to a given size.
A method of arrangement of a reinforcement for horizontal reinforcing of a masonry lies in that mesh strips are arranged in each tier of the masonry in pairs along edges of a wall, wherein the distance from an external rod of the strip to the corresponding edge of a wall is 5...15 mm.
A technical effect lies in decrease of weight of the reinforcement, reduction of labor input of production thereof, reduction of thickness of a mortar layer, wherein the reinforcement is arranged, in increase of strengthening properties of the reinforcement, in prevention of deterioration of thermal insulating properties of a wall, and, eventually, in increase in economic efficiency of the construction.
The invention is explained by the following drawings: - fig. 1 - stages of production of the reinforcement from a strip having a thickness of 0.5...1.0 mm, wherein:
I - initial strip;
II - cutting of the external outline;
III - punching of internal grooves;
IV - mounting walls;
V - dismounting walls providing doubled thickness of edges of a reinforcement strip;
VI - a longitudinal expanding of a workpiece.
- fig. 2 - a cross-section of the strip with an U-shaped mounting;
- fig. 3 - a cross-section of the strip with the doubled thickness of edges of the reinforcement strip;
- fig. 4 - arrangement of the reinforcement in a wall, top view.
In case of use of a strip having a thickness of 1.5...2.5 mm, stages IY and Y are absent.
The reinforcement for a horizontal reinforcing represents a mesh strip including two flat zigzag-like longitudinal rods (1), which are connected by the lintels (2) lying in the same plane with longitudinal rods and made integrally wit them, wherein the distance between longitudinal rods is in the range of 25...50 mm, while distance between lintels is in the range of 75...120 mm, wherein joints of the longitudinal rods with lintels are made by radiuses, which are not less than half of thickness of a sheet, from which the reinforcement is made, while the pinch of deflection of said zigzags is 5...10 mm.
The zigzag-like shape of longitudinal rods allows to distribute the load perceived by them regularly along the entire length of the rods, and not just to transfer it to the rod in points of junctions with the lintels.
Joints of the longitudinal rods with lintels are made by radiuses, which are not smaller than half of thickness of the sheet, from which the reinforcement is made.
The reinforcement is made of sheet steel having a thickness of 0.5 - 2.5 mm;
In order to improve engagement with masonry solution the reinforcement is textured by creation of protrusions of a random shape on faces thereof, for example, in the form of a direct or mesh corrugation.
Height of the created protrusions can be 0.1...0.3 of the from metal thickness. Estimated calculation of section of the rods of the reinforcement grid
The most serious loads on the reinforcement of a masonry of walls create earthquake forces. In this case the most loaded is the longitudinal rod of the one of that two grids of a single tier, which experiences stretching tensions.
We will calculate load on an element of the envelope wall, for example, of the sixth floor of the frame building in the conditions of seven-point earthquake load.
According to of the Building Code 11-7-81 "A construction in earthquake areas. Design standards", item 2.5, earthquake design load Sik, in a selected direction, applied to a point k and that corresponds to i-th tone of a natural oscillation of the building, is determined by a formula
Sik = Ki K2 S0ik, where
Ki - coefficient considering allowed damages of buildings that equals in our case to 0.25 [14, table 3, item 2];
K2 - the coefficient considering constructive solutions of buildings that equals in our case to 1.0 [14, table 4, item 1];
Soik -value of the earthquake load for i-th tone of natural oscillations of the building that , is determined assuming elastic deformation of structures by a formula
Soik = Qk-A-prK„,-r]jk, where
Qk - weight of an element of the building in a point k. When making a wall from cellular concrete having a density of 400 kg/m3 and under the specified thermal resistance of the wall being R0 = 2.575 m2 0C/W thickness of the wall is 400 mm. In case of distance between tiers of the reinforcement being 400 mm and length of the block being 600 mm the volume of the element will be 4-4-6 = 96 dm3, and weight - 96-0,4 = 58.4 kg.
A - coefficient, which in case of estimated seism icity of 7 points equals to 0.1 [14, item 2,5];
βι - dynamic factor corresponding to i-th tone of natural oscillations of the building accepted for soil of category II as not more, than 2.7 [14, item 2,6];
Κψ - coefficient, which for 7-point seismic load equals to 7 [14, item 2, table 6];
Hjk - coefficient that is dependent on a deformation shape of the building, accepted for given conditions as being equal to 2.0.
Thus, estimated seismic load per a given element of a wall will be 0.25- 1 -58.4 0.1 -2.7-7 ■ 2 = 78.84 kg.
This load directed perpendicular to the wall is perceived as expanding one by two rods of the external strip of the reinforcement. For technological reasons we accept width of each longitudinal rod as being 3 mm at the thickness of material of 2 mm. Then the section of each rod will be 2.0-3.0 = 6.0 mm. In case of production of the reinforcement from a cold-rolled steel of 08 kp of GOST 1050 for which σΒ (fluidity limit) = 275...390 MPas, considering its hardening in case of cold deformation up to σΒ = 500 MPas and reduction of thickness up to 1.6 mm, resistance to tensile of both longitudinal rods of the external reinforcement tape will be 1.6 mm-3 mm-2-50 kg/mm2 = 480 kg that is more than by 6 times exceeds the estimated load.
Since during calculation neither resistance of the wall itself nor of the second grid working for compression was considered, use of the claimed reinforcement in the most earthquake-prone regions is quite reasonable.
The method of production of a reinforcement for horizontal reinforcing of a masonry from a strip of sheet steel having a thickness of 0.5 - 1.4 mm lies in that this strip in a stamp of a consecutive action at the first step is cut off along the outline making external grooves (3), at the second step internal S-shaped grooves (4) are punched, at the third step walls of external and internal grooves are mounted providing ,, them with a U-shaped form, at the fourth step vertical walls are dismounted, thereby i creating a two-layer section of each reinforcement element, at the fifth step the X workpiece is expanded in the longitudinal direction.
The method of production of the reinforcement for reinforcing of a masonry from a strip of sheet steel having a thickness of 1.5 - 2.5 mm lies in that this strip in a stamp of a consecutive action at the first step is cut off along the outline making external grooves (3), at the second step internal S-shaped grooves (4) are punched, at the third step it is expanded in the longitudinal direction up to a given size.
A specific example of making the reinforcement, which does not exhaust all possible embodiments of production thereof, is described.
A sheet of plastic steel, for example, of a cold- olled brand of 08 kp having a thickness of 2.0 mm, is cut for strips having a width of 40 mm, which in a stamp of a consecutive action are subjected to the following operations: cutting off an external outline making external grooves; punching internal grooves; expanding the workpiece up to production of a grid having rectangular openings 30 x 75 mm. At the same time lintels are made straight and longitudinal rods are zigzag-shaped having a pitch of deflection being 5...10 mm.
Steps of manufacturing of the reinforcement are presented on fig. 1.
The stamped reinforcement is subjected to cold hardening, for example, passing it through rollers, wherein thickness of the reinforcement decreases by (10...30) %. At the same time both surfaces of the reinforcement are textured applying, for example, a direct cross corrugation, which additionally increases engagement of the reinforcement with masonry solution. Besides, when rolling, burrs, which appear during dividing operations of stamping in the process of wearing of cutting edges of punches and stamp matrix, are swaged.
Said method of production of the reinforcement allows to receive about three meters of a final reinforcement from each running meter of the workpiece.
If needed, the reinforcement is coated with zinc or made of a sheet that is pre- coated with zinc.
The described production scheme allows to minimize amount of the metal that is removed to a waste.
The specified sizes of the reinforcement are approximate and can vary depending on material and thickness of the wall, as well as on estimated loads onto 1 walls of the building.
The method of arrangement of the reinforcement in the masonry of the wall of the building lies in that mesh strips are arranged in each tier of the masonry in pairs along edges of the masonry, wherein the distance from an external rod of the strip to the respective edge of the masonry is 5...15 mm.
Such arrangement of the reinforcement is caused by behavior of the horizontal reinforcement in the masonry upon seismic impact thereon. In particular, if the distance from the external rode of the strip to the respective region of the masonry is less than 5 mm, in case of seismic impact the reinforcement can push out solution outside, and the wall will collapse. If it is more than 15 mm, the overall operational performance of the reinforcement will decrease in view of its proximity to an idle central (neutral) area of the wall.
The reinforcement that is arranged in such a way is well connected with the masonry and perceives the bend-tension loads of the wall occurring in the process of using the building in an optimal extent. The suggested reinforcement provides increased load capacity and vibration resistance of the wall. At the same time, the claimed reinforcement has weight and labor input of production, which are smaller than of the reinforcement of any known type.
Since the strips of reinforcing grids of each tier, the strips being arranged in pairs', are separated from each other by a solution layer, there are no "cold bridges" that avoids a need in additional thermal insulation of the wall or allows to reduce thickness thereof.
Small thickness of the reinforcement grid allows to reduce the solution layer that additionally increases thermal uniformity of the wall. All of this allows to exclude use of an additional layer of thermal insulation or allows to reduce thickness thereof.
Besides, arrangement of the rods of the reinforcement grid in one plane, rather than with an overlap, allows to increase the reinforcement resistance to the perceived loads.
Low material and the labor input of the claimed reinforcement causes its significantly smaller cost in comparison with the known types of the reinforcement, ί'
The reinforcement made according to the invention and arranged in the mentioned way is well connected with the masonry and perceives the bend-tension loads of the wall occurring in the process of using the building in an optimal extent, without worsening the heat-insulating properties of the wall.
Thus, the suggested reinforcement is completely compliant with the requirements of the existing construction regulations and outstanding cost efficiency.
\ . NCM F.03.02-99. Construction regulations. Stone structures. Construction and calculation of stone structures, item 5.2.2.23
2. US 3,348,354
3. US 8,448,404
4. US 4,667,452
5. US 8,733,055
6. US 8,051 ,619
7. RU 2133806
8. US 8,590,246
9. US 6,421 ,977
10. RU 47406
11. UK 2443484 12. UK 1403181 Making reinforcing members for cavity walls
13. MD 764
14. Building Code 11-7-81 " A construction in earthquake areas. Design standards"
15. MD 1038

Claims

Claims
1. A reinforcement for a horizontal reinforcing of a stone masonry made as a grid being a strip including two flat longitudinal rods, which are connected by the lintels, characterized in that the longitudinal rods are zigzag-shaped and made integrally with the lintels lying in the same plane with the longitudinal rods, wherein the distance between the longitudinal rods is in the range of 25...50 mm, while the distance between the lintels is in the range of 75...120 mm, while the pinch of deflection of said zigzags is 5...10 mm.
2. The reinforcement of claim 1, characterized in that all joints of the longitudinal rods and lintels are rounded by a radius that equals to at least a half of thickness of metal from which the reinforcement is made.
3. The reinforcements of claims 1 , 2, characterized in that faces thereof are provided with protrusions of any shape, for example, in the form of a direct or mesh corrugation, wherein the height of the protrusions is 0.1...0.3 of the metal thickness. ; '
4. A method of production of the reinforcement for horizontal reinforcing of a masonry, the method lies in making grooves in a strip of sheet steel with further expanding of the resulting grid, characterized in that the strip of sheet steel having a thickness of 1.5...2.5 mm in a stamp of a consecutive action at the first step is cut off along the outline making external grooves, at the second step internal S-shaped grooves are punched, at the third step it is expanded in the longitudinal direction up to a given size.
5. A method of production of a reinforcement for horizontal reinforcing of a masonry, the method lies in making grooves in a strip of sheet steel with further expanding of the resulting grid, characterized in that the strip of sheet steel having a thickness of 0.5...1.4 mm in a stamp of a consecutive action at the first step is cut off along the outline making external grooves (3), at the second step internal S-shaped grooves (4) are punched, at the third step walls of external and internal grooves are mounted providing them with a U-shaped form, at the fourth step vertical walls are dismounted, thereby creating a two-layer section of each reinforcement element, at the fifth step the workpiece is expanded in the longitudinal direction.
6. The method according to claims 4 and 5, characterized in that the reinforcement is subjected to cold hardening by, for example, rolling in rolls with reduction of thickness by (10...30) %.
7. The method according to claims 4 and 5, characterized in that when swaging the reinforcement is subjected to texturing of faces by creation of protrusions of a random shape thereon, for example, in the form of a direct or mesh corrugation with height of the created protrusions being 0.1 ...0.3 of the metal thickness.
PCT/MD2017/000007 2017-01-27 2017-11-23 A reinforcement for a horizontal reinforcing of a masonry and a method of production thereof WO2018139912A1 (en)

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MDA20170012A MD4558C1 (en) 2017-01-27 2017-01-27 Armature for horizontal reinforcement of stone masonry and process for manufacturing thereof (embodiments)
MDA20170012 2017-01-27

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US2313533A (en) * 1939-05-29 1943-03-09 Ferrex Corp Expanded metal lath
US3010493A (en) * 1961-05-01 1961-11-28 Portland Wire & Iron Works Machine for making masonry reinforcement
US3348354A (en) 1965-08-04 1967-10-24 Dur O Wal National Inc Masonry reinforcement
GB1403161A (en) 1972-10-18 1975-08-13 Dietsche Roman Kg Circular brush with adjustable bristles
US4667452A (en) 1983-04-15 1987-05-26 Ytong Ag Reinforcing unit including steel mats connected by connector bars
NZ231531A (en) * 1989-11-27 1992-08-26 Gospel Resource Ltd Sheet metal article made by slitting and expanding
EP0524907A1 (en) * 1991-07-24 1993-01-27 Thomas Mösch Masonry reinforcement
EP0681071A1 (en) * 1994-05-04 1995-11-08 Walter Zeller Reinforcing grid for masonry joints and installation for its manufacture
RU2133806C1 (en) 1994-07-18 1999-07-27 Н.В.Бекаерт С.А. Reinforcing strip and method for its continuous production
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RU47406U1 (en) 2005-04-18 2005-08-27 Закрытое акционерное общество "Корпорация СИТЕХ" (ЗАО "Корпорация СИТЕХ") REINFORCEMENT FRAME
GB2443484A (en) 2006-11-02 2008-05-07 Victor Joseph Wigley Masonry bed reinforcement
US8733055B2 (en) 2008-10-13 2014-05-27 Nv Bekaert Sa Masonry with steel reinforcement strip having spacers
US8051619B2 (en) 2008-10-27 2011-11-08 Mitek Holdings, Inc. Reinforcing spacer device
US8448404B2 (en) 2011-06-06 2013-05-28 Masonry Reinforcing Corporation Of America Bond beam rebar positioner
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