RU2725981C1 - Reinforcement mesh from composite material - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction, namely to reinforcement structures, which are used for reinforcement of stone and brick masonry, concrete articles, for reinforcement of bases of buildings and structures, as well as during construction and repair of roads, aerodrome runways, for strengthening coastal lines. Reinforcing mesh from composite material is made of longitudinal and transverse rods, smooth or with abrasive coating, with identical or different cross-section area connected to each other. Connection of rods is a node element made of a bitumen-based composition.

EFFECT: technical result is higher strength of connection of rods between each other and reduced power consumption when making a mesh.

6 cl, 1 tbl, 6 dwg

Description

Technical field

[0001] The invention relates to construction, namely to reinforcing structures that are used for reinforcing masonry and brickwork, concrete products, to strengthen the soil of the foundations of buildings and structures, as well as in the construction and repair of roads, runways of airfields, for shoreline strengthening.

[0002] An analogue of the claimed technical solution is a reinforcing mesh according to the patent of the Russian Federation No. 2008113714, ЕСС 5/07, publ. October 20, 2009. The mesh consists of reinforcing bars reinforced with fibers of synthetic material, connected by fibers, which are laid in a matrix of synthetic material and are repeatedly wrapped around reinforcing bars. A drawback of the design of such a mesh is that the longitudinal and transverse rods are a circle in cross section and the point of contact has a small contact area, which reduces the strength of the mesh, especially under shear load.

[0003] In addition, a reinforcing mesh made of composite material according to the patent of the Russian Federation No. 2430221, ЕСС 5/07, publ. September 27, 2011. The reinforcing mesh consists of longitudinal rods and a transverse rod, directly or zigzag laid on the longitudinal rods. Cross connections are formed by compressing cured and non-cured rods, followed by curing of the mesh. The strength of the connection node of this grid is determined by the test result - a drop from a height of 1 meter. However, in this case, the operational loads of the reinforced structure (static, cyclic and alternating loads) are not taken into account. Destruction of the integrity of the mesh node can lead to the mobility of the rods relative to each other, uneven distribution of the load in the structure, which will reduce the load resistance of the reinforced structure. The disadvantage of this design is that the strength of the cross-connections of the mesh is achieved only due to the released binder when the rods are pressed in, the strength of the fastener is insufficient to withstand the loads that arise during the service life of the reinforced structures.

[0004] The prototype is a reinforcing mesh made of composite material according to the Eurasian patent No. 023958 B2, publ. 04/30/2018, According to the patent, the reinforcing mesh is made of composite longitudinal and transverse rods interconnected by means of a connecting element made of a polymeric material, for example a thermoplastic mass, or a thermosetting resin containing a fibrous filler. However, the rod bonding materials used in the invention do not provide sufficient strength for the connection of the rods, in addition, due to the low thermal stability of the connection, a large consumption of thermoplastic polymer occurs. The disadvantages of this technical solution include the possible thermal degradation of the composite material of the rods themselves at the point of contact with the polymer material due to the high melting temperature of the polymer, which can lead to a decrease in strength and destruction of the attachment point of the rods.

Disclosure of the invention:

[0005] The technical result is to increase the strength of the connection of the rods of the mesh with each other and reduce energy consumption in the manufacture of the mesh.

[0006] The technical result is achieved by the fact that the reinforcing mesh, consisting of longitudinal and transverse reinforcing elements connected at the intersection of nodal elements consisting of a composition based on bitumen.

[0007] The nodal element, depending on the field of application of the mesh, can be either only a capsule from a composition based on bitumen, or a winding from composite fibers (fiberglass, basalt fiber, carbon fiber, aramid fiber, etc.) encapsulated by a composition based on bitumen .

[0008] The nodal element may have a complex curved shape, the shape of a cylinder, ball, polyhedron, or a combination of these shapes.

[0009] The reinforcing mesh can be made of both smooth rods and rods with a corrugated surface, as well as rods coated with abrasive material. In addition, the nodal element itself can be coated with abrasive material in order to increase the adhesion of the bonding material to concrete and other building binders, resulting in increased strength of the reinforced structure. The rods can be made of various fibrous materials. They can be either cured or not cured at the time of formation of the nodal element.

[0010] The achievement of the technical result is confirmed by the test results of the nodal elements on the shift of the junction of the rods.

[0011] The characteristics of the nodal element improve the strength of the mesh, and also due to the simplicity of its manufacturing process, contribute to the reduction of energy consumption in the manufacture of the mesh due to the low melting temperature of the material based on bitumen and the high curing speed of the formed nodal elements.

[0012] It is obvious that both the previous general description and the following detailed description are given by way of example and explanation only and are not limitations of the present invention.

Brief Description of the Drawings:

[0013] FIG. 1 - square shape of the cell.

[0014] FIG. 2 - rectangular shape of the cell.

[0015] FIG. 3 - reinforcing mesh made of transverse curved rods in the form of a zigzag.

[0016] FIG. 4 - a grid twisted into a roll.

[0017] FIG. 5 - winding made of composite materials.

[0018] FIG. 6 - nodal element formed by a winding of a composite material encapsulated by a material based on bitumen.

The implementation of the invention:

[0019] The shape of the cell depending on the angle or inclination radius of the reinforcing elements may be square. FIG. 1, rectangular FIG. 2, rhombic, trapezoidal, etc.

[0020] The reinforcing mesh may be made of transverse curved rods in the form of a zigzag of FIG. 3, where the fastening of the transverse curved rods can be made along straight longitudinal rods by connecting them along bends.

[0021] In all versions of the reinforcing mesh, the diameters of the reinforcing elements can be made of equal or different cross-sectional areas.

[0022] In FIG. 1 shows a fragment of a reinforcing mesh consisting of longitudinal rods 1 and transverse rods 2 interconnected by a nodal element 3. The nodal element 3 is made of bitumen-based material. Both the longitudinal and transverse rods are made of composite materials.

[0023] The fabrication of the mesh depending on the application occurs in either one or two stages.

[0024] The manufacture of reinforcing mesh in one step.

[0025] The transverse rods are located above or below with respect to the longitudinal rods. The resulting intersections of the rods are placed in a forming tool, into which the necessary dose of bitumen-based material is supplied. As the material cures, the material assumes the shape specified by the forming tool, providing a firm connection of the rods with a nodal element. When forming the nodal element, depending on the type of automatic line, a gate can be formed. Depending on the purpose of the mesh, the use of the gate as limit stops can contribute to the constancy of the location of the mesh inside the manufactured product.

[0026] The strength of the nodal elements of the mesh made in one step is such that the nodal elements are not destroyed as a result of the fall of the mesh from a height of 5 meters. In addition, when twisting the mesh (diameters of reinforcing elements up to f4 mm) to a radius of 150 mm. (Fig. 4) and keeping it in this position at temperatures from + 45 ° С to -30 ° С for a long time (from 30 days), the nodal elements retain their integrity. These properties of the mesh allow it to be transported not only in a straightened form, but in the form of rolls at high and low temperatures, while maintaining the strength of the mesh.

[0027] The manufacture of the mesh in two stages.

[0028] In the first step, the transverse rods are located above or below with respect to the longitudinal rods. A special tool equipped with composite fibers at the intersection of the rods make circular and cross movements between the longitudinal rod and the transverse rod, thereby creating a winding of composite fibers in one or more layers (Fig. 5). Next, the tool with composite fibers is moved to the next intersection of the rods, thereby determining the mesh pitch.

[0029] In the second stage, the nodes of the intersection of the rods created by a single or multiple winding with composite fibers are placed in a forming tool, into which the necessary dose of material based on bitumen is supplied. The material completely impregnates the fibers wrapped around the core and, as it hardens, takes the shape specified by the forming tool. Thus, the nodal element is a winding of composite fibers encapsulated by a material based on bitumen (Fig. 6).

[0030] The manufacture of the mesh in two stages allows to achieve a very high strength of the connection of the rods, which is determined by the test results of the nodal elements on the shift of the junction of the rods shown in the Table.

Examples of reinforcing mesh implementation:

[0031] Example 1 (Fig. 1)

[0032] The longitudinal and transverse smooth rods of circular cross section are made of fiberglass f3 mm. As a nodal element used material based on bitumen. The nodal element has a complex curly shape. The mesh size is 100 × 100 mm.

[0033] Example 2 (Fig. 2)

[0034] The longitudinal and transverse smooth rods of circular cross section are made of fiberglass plastic 12 mm and coated with abrasive material. The mesh size is 80 × 300mm. The nodal element is made in two stages. At the first stage, the rods are connected by cross-multiple winding with fiberglass; at the second stage, the assembly is encapsulated with bitumen-based material. The nodal element has a cylindrical shape.

[0035] Example 3 (Fig. 3)

[0036] The longitudinal rods are made of basalt plastic with a diameter of f4 mm. Cross rods with a diameter of f4 mm are made of a curved shape in the form of a zigzag. The connection of the transverse rods with the longitudinal is made in bends and fastened with a material based on bitumen. The nodal element has the shape of a cylinder.

[0037] Tests have shown that the reinforcing mesh according to the invention, made of composite materials of rods of various geometries, cross-sectional areas and physico-mechanical properties, bonded using nodal elements from a composition based on bitumen in one or two stages, have high physical and mechanical properties and the required high strength of the nodes of the connection rods.

Claims (6)

1. A reinforcing mesh made of composite material made of longitudinal and transverse rods, smooth or with an abrasive coating, with the same or different cross-sectional area, interconnected, characterized in that their connection is a nodal element made of a composition based on bitumen. 2. A reinforcing mesh made of composite material made of longitudinal and transverse rods, smooth or with an abrasive coating, with the same or different cross-sectional area, interconnected, characterized in that their connection is a nodal element made in the form of a composite fiber winding encapsulated composition based on bitumen. 3. The reinforcing mesh according to claim 1 or 2, characterized in that the mesh cells are in the form of a square, rectangle, rhombus, polyhedron. 4. The reinforcing mesh according to claim 1 or 2, characterized in that the transverse rods of the mesh are made of a curved shape in the form of a zigzag and connected to the longitudinal rods by bending. 5. The reinforcing mesh according to claim 1 or 2, characterized in that the connecting element is made in the form of a figure of complex shape, in the form of a cylinder, a ball, or a combination of these forms. 6. The reinforcing mesh according to claim 1 or 2, characterized in that the nodal element has a gate.

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