RU2361983C1 - Wire mesh for brick structures - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention is related to production of reinforced masonry structures, namely, to production of brick wall structures with transverse reinforcement by textile webs of high-strength threads and may be used in industries related to construction of objects of residential-civil and production purpose. Substance of invention consists in creation of wire mesh that consists of transverse and longitudinal reinforcing elements joined to each other and crossing at the right angle, creating square cells, at that longitudinal and transverse reinforcing elements are made of high-strength threads, with strength of at least 1000 MPa, being connected to each other, in crossing points of reinforcing elements, by warp-knitting method, for instance, from polyester thread that creates additional mesh inside every square cell of wire mesh with size of internal cell of not more than 1/4 from size of wire mesh square cell.

EFFECT: application of wire mesh in reinforced masonry wall structure, namely, simultaneous provision of properties complex: required rated resistance of masonry, lighter weight of structure, lower heat losses, and also reduced cracking due to absence of corroded materials in masonry.

1 cl, 1 tbl, 2 dwg, 2 ex

Description

The invention relates to the production of stone-reinforced structures, namely the production of brick wall structures with transverse reinforcement with textile fabrics of high-strength yarns, and can be used in industries related to the construction of housing and industrial facilities.

It is known that when erecting multi-storey residential and public buildings from brick to reinforce stone structures, brickwork is reinforced. Reinforcement of stone structures significantly increases their bearing capacity, solidity and ensures the joint operation of individual parts of buildings.

The following types of reinforcement are used in construction:

- transverse (mesh with the location of reinforcing meshes in the horizontal seams of the masonry);

- longitudinal with the location of reinforcement outside under a layer of cement mortar or in the furrows left in the masonry;

- reinforcement (reinforcement) by including reinforced concrete in the masonry;

- reinforcement by including an element in a reinforced concrete or metal clip from the corners.

From the patent of the Russian Federation 2273705, cl. E04C 5/07 known reinforcing mesh for reinforcing reinforced concrete structures, consisting of intersecting at right angles and welded together longitudinal and transverse wires. The manufacture of this grid is associated with the use of multipoint lattice-welding installations operating by the method of electrical resistance. This manufacturing method causes damage to the mesh at the junction of the wires and can cause them to shift relative to each other, which will inevitably lead to a decrease in the reinforcing effect.

From [A.Peled, A.Bentur. Fabric structure and its reinforcing efficiency in textile reinforced cement composites. Composites: Part A, Volume 34, 2003, 107-118] known reinforcing woven and knitted fabrics of concrete structures used in the construction of civilian facilities. Various woven and knitted fabrics are used as reinforcing mesh with different geometries and the way of joining threads at the intersection points.

A warp knitted fabric with a straight-through weft thread inserted in the direction of reinforcement, the disadvantage of which is to provide the structural bearing capacity only in the direction of reinforcement.

Warp knitted fabric with inserted broaches of the weft thread in the form of a zigzag. The disadvantage is the low efficiency of the reinforcement due to the complex geometry with the weft thread inserted.

Woven fabric with reinforcing warp and weft threads of high strength fibers. The disadvantage of this fabric is also the low efficiency of the reinforcement due to the fact that the reinforcing threads are in a curved shape.

The closest solution to the proposed invention is the transverse (mesh) reinforcement of brickwork with reinforcing meshes. Known reinforcing mesh [Reference designer industrial, residential and public buildings. Stone and stone-stone structures // Under the general editorship of S.A.Sementsov and V.A.Kameyko. - M .: Publishing house of building literature, 1968. - P.61-64], consisting of longitudinal and transverse reinforcing elements interconnected and intersecting at right angles, forming square cells with side sizes from 3 × 3 to 10 × 10 cm with a step of 0.5 cm. Steel reinforcement of circular cross section is used as reinforcing elements.

A disadvantage of the existing armor-stone structure is its thermotechnical heterogeneity due to the presence of heat-conducting inclusions in the form of metal elements of reinforcing meshes having a large coefficient of thermal conductivity (see table). As a result of this, the total heat loss of the building and, as a consequence, the cost of heating it increase. In addition, the minimum cell size of the metal mesh does not exceed 3 × 3 cm. This cell size does not protect the brickwork from the ingress of mortar into the voids of the brick, which also reduces the heat transfer resistance of the reinforced stone wall structure.

The technical result of the claimed invention is the elimination of these shortcomings of the reinforced stone wall structure, namely the simultaneous provision of a set of properties: the required design masonry resistance, comparable in numerical values to the compressive resistance of masonry with mesh reinforcement from metal nets due to the high strength of the reinforcing mesh, which prevents the transverse expansion of brick masonry when exposed to vertical forces; light weight construction by reducing the surface density of the mesh; reduction of heat loss due to a lower numerical value of the coefficient of thermal conductivity compared to metals, which increases the heat transfer resistance of the walling and thereby reduces the heat loss of the building and increases the heat-insulating properties of brick structures by preventing the mortar from getting into the through voids of the brick (see table. ), as well as a decrease in cracking due to the absence of materials susceptible to corrosion in the masonry.

The task is achieved in that in the horizontal seams of the masonry during its construction, a reinforcing mesh is laid, consisting of longitudinal and transverse reinforcing elements interconnected and intersecting at right angles, forming square cells, characterized in that the longitudinal and transverse reinforcing elements are made of high strength yarns with a strength of at least 1000 MPa, interconnected, at the intersection of the reinforcing elements, in a warp knitting method, for example, of polyester yarn, forming th inside each square mesh cell reinforcing additional mesh.

An essential feature of the claimed technical solution is the combined use of longitudinal and transverse reinforcing elements of high-strength yarns, with a strength of at least 1000 MPa, interconnected at the intersection of the reinforcing elements, in a warp knitting method, for example, of polyester yarn forming reinforcing mesh inside each square cell additional mesh with the internal cell size of not more than _^1/4 of the square grid cell size of the reinforcement. The sharing of such a combination of features in the prior art by the authors was not found. Although it is known to use longitudinal and transverse reinforcing elements for reinforcing brick structures [Handbook of the designer of industrial, residential and public buildings. Stone and stone-stone structures // Under the general editorship of S.A. Sementsov and V.A. Kameyko. - M .: Publishing house of building literature, 1968. - P.61-64] and the use of woven and warp knitted fabrics for reinforcing concrete structures used in the construction of civilian objects [A.Peled, A.Bentur. Fabric structure and its reinforcing efficiency in textile reinforced cement composites. Composites: Part A, Volume 34, 2003, 107-118]. Thus, only an inextricable combination of the claimed features ensures the achievement of the technical result described above and the unequal sum of the results from separately partially known features, which allows us to conclude that the differences are significant.

Figure 1 shows the reinforcing mesh for brick structures, consisting of reinforcing elements made of high-strength yarns, laid using the end layout in the longitudinal direction of the mesh 1 and the threads perpendicular to them 2. The reinforcing elements are interconnected in a warp knit razhel way by weaving leotards using ground polyester yarns 3. Experimental data showed that the use of a different type of weaving of ground yarns for connecting reinforcing mesh elements does not iyaniya on the grid reinforcing properties. The load bearing threads 1, 2 are composed of high strength fibers, for example aramid or glass. Figure 2 shows a separate mesh cell reinforcing 4 with the inner cell 5 of the additional inner mesh. The cells of the additional internal mesh have a different geometric shape, limited by loops and broaches of ground filaments of different shapes and sizes, but not exceeding 1/4 of the size of a square cell of the reinforcing mesh.

Example 1. The reinforcing mesh was produced by a warped knit rachel weaving of leotards with the end layout of reinforcing glass filaments with a linear density of 2400 tex in two additions. Polyester yarn with a linear density of 28.5 tex was used as filament yarn. The mesh is made on a warp knitting rachel machine of class 6. The mesh was formed by knitting ground filaments and simultaneously laying reinforcing filaments along the loop rows and loop stitches in each of them. Reinforcing mesh cell size of 3 × 3 cm, and the internal cell dimensions calculated in a known manner, made not more than _^1/4 the cell size of a square grid reinforcement. The surface density of the grid is 320 g / m ² . The tensile strength of the mesh 72.6 kN / m.

Example 2. The reinforcing mesh was produced by a warp knit rachel weaving of leotards with the end layout of reinforcing polyester yarns with a linear density of 4000 tex. The mesh is made on a warp knitting rachel machine of class 6. Polyester yarn with a linear density of 28.5 tex was used as filament yarn. The mesh was formed by knitting ground filaments and simultaneously laying reinforcing filaments along the loop rows and loop stitches in each of them. Reinforcing mesh cell size of 3 × 3 cm, and the internal cell dimensions calculated in a known manner, made not more than _^1/4 the cell size of a square grid reinforcement. The surface density of the grid is 230 g / m ² . The tensile strength of the mesh 79.2 kN / m.

Table Comparative characteristics of reinforcing mesh samples Prototype (metal mesh) The inventive solution Example 1 (glass mesh) The inventive solution Example 2 (polyester mesh) Surface density, g / m ² 880 320 230 Tensile strength, kN / m 22 25 25 The coefficient of thermal conductivity, λ, W / m · K 65 0.9 2.6

It was experimentally found that the use of the proposed reinforcing mesh (examples 1, 2) significantly reduces the possibility of penetration of mortar into the brickwork. A fragment of brickwork 64 cm wide was reinforced with a mesh. After the mortar hardened, a fragment was dismantled and it was found that the penetration of the mortar into the voids of the brickwork was reduced by 70% compared to the metal mesh.

Claims (1)

Reinforcing mesh for brick structures, consisting of longitudinal and transverse reinforcing elements interconnected and intersecting at right angles forming square cells, characterized in that the longitudinal and transverse reinforcing elements are made of high-strength filaments with a strength of at least 1000 MPa, interconnected, at the nodes of the intersection of the reinforcing elements, in a knitting method, for example, of polyester yarn, forming an additional mesh with rum internal cell is not more than 1/4 of the square of the cell size of grid reinforcement.

Images