RU159026U1 - COMPOSITE FITTINGS - Google Patents

Abstract

Composite reinforcement comprising a core made of a multitude of fiberglass impregnated with a binder, a tourniquet wrapped around the core and granules connected to the core by a core located on the core, characterized in that each granule is embedded in one core of the core and the other part of the granule extends from the core into the direction from the longitudinal axis of the core, with the bundle located in a helical groove of the core, each granule is embedded in the core under pressure and a part of the gr nuly has a volume smaller than the volume in comparison with the other parts of pellets extending from the core.

Description

Composite reinforcement

The utility model relates to reinforcing concrete, in particular to reinforcement made of composite materials.

Fiberglass reinforcement is known from the prior art, the rods of which are made of high-strength polymer material with a winding forming ledges. In particular, a composite rod made of polymer for reinforcing binding media is known, including fibers combined into bundles, the core being formed by twisted bundles, the diameter of each bundle is 25-47% of the diameter of the core, the number of bundles selected is not less than three, and the number of twists of bundles per meter the rod is in the range 5-120 (RU 2430220 C2, 08/20/2010). In this technical solution, each strand of reinforcement is impregnated with a cured polymer resin, and in the process of manufacturing the reinforcement, voids are formed between the strands, which are also filled with resin. The voids filled with the cured resin significantly weaken the reinforcement and give it brittleness due to the greater brittleness of the cured resin compared to fibers. It was also found that the tensile, bending and compression strength of the reinforcement depends on the resin content in the reinforcement, and in this regard, there is an optimal ratio of resin and fibers in the reinforcement. Since in the known reinforcement its surface is smooth, this reduces the adhesion of the reinforcement to concrete, and the recesses formed between the bundles do not sufficiently provide the specified adhesion, since during the operation of the reinforcement in tension. in cured concrete, shifts of smooth reinforcement relative to the concrete mass are possible. Studies show that the number of torsion of the strands per meter of reinforcing bar in the range of 5-120 is not related to the tensile strength of the strands of the strands, as a result, the known reinforcing bar has a relatively high stiffness.

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Also known are composite reinforcing bars, reinforcing bars, methods for their manufacture, presented in the patent documentation descriptions: CA 2298281 A1, 08.08.2001; CN 158757 6A, March 2, 2005; CN 201280782 Y, July 29, 2009; US2005064184 A, 3/24/2005 and US 7396496 B2, 07/08/2008, moreover, in the application US 2005064184 A a method is described for manufacturing composite reinforcement and applying sand abrasive particles to its surface in order to increase the adhesion of the reinforcement to concrete. The core has a circular shape in cross section, which reduces its resistance to displacement in the solidified concrete mass during torsion and bending.

The essential requirements for composite reinforcement are to ensure reliable adhesion of reinforcement to concrete and to prevent failure of reinforcement in cured concrete during operation of the concrete structure. For this purpose, composite reinforcement is performed with various kinds of hooks or, for example, wave-like (RU 2431026 C1, 10.20.2011). In another technical solution, composite reinforcement is made in the form of a flat tape with a certain ratio of width to thickness (RU 2388878 C1, 05/10/2010). In order to increase the strength of the connection with concrete in composite reinforcement, various coatings of its surface or sprinkling of the surface with a material that improves adhesion are used (RU 2008122349, 10.12.2009).

In another known composite reinforcement containing fibers, resin and hooks, the latter are formed by a layer of sand fixed on the cured surface of the reinforcement, while the hooks are made at the ends of the reinforcing bars in the form of thickenings, each thickening is made in the form of a winding coated with abrasive material or cement (RU 2001113390 A, 05/10/2003; RU 82244 U1, 04/20/2009; RU 104953 U1, 05/27/2011).

Of the known technical solutions, the closest technical solution to the technical solution presented in this description is composite reinforcement, characterized in that it contains ropes impregnated with fibers made of fibers, abrasive particles fixed on the surface of the reinforcement fixed by cured resin, ropes 3

interconnected by twisting them around each other and fixing with a cured resin in this position, grooves are formed between the turns of the bundles, in the contact zone of the bundles along the entire length of the reinforcement a screw-like connecting layer is made of cured resin and fibers of two bundles, in cross section the reinforcement is formed by a pair of contacting between each other through the connecting layer of bundles, each of which has an oval shape in cross section. The cross-sectional area of each bundle is selected within 40-49% of the total cross-sectional area of the reinforcement, the cross-sectional area of the connecting layer is selected within 20-2.0% of the total cross-sectional area of the reinforcement, a rough crust covering it is made on the outer surface of the reinforcement, made of a conglomerate of particles of abrasive material and cured resin, while the crust area in its cross section is selected within 2-15% of the total cross section area of the reinforcement (RU 124710 U1, 02/10/2013).

The said crust is made of a conglomerate of cured resin and particles of abrasive material (sand, granite or other crumbs). The crust is obtained by applying an abrasive to the resin layers covering the tows, and these resin layers provide a certain thickness of the total layer made of resin words, the total resin layer being obtained during the manufacture of the crust in order to prevent damage to the fibers by the particles of abrasive material. The total thickness of the resin layer that forms the crust is selected so that contact of the abrasive particles and the fibers of the bundles is prevented. The manufacture of the resin layer of the peel and the peel itself is carried out using special technology.

As practice has shown, abrasive particles deposited on the surface of the core by sprinkling the surface do not provide sufficient adhesion of reinforcement to concrete. This is due to the fact that after artificial aging in an alkaline environment, the outer polymer layer loses its strength properties and the adhesion of reinforcement to concrete is reduced. It's 4

reduces the bearing capacity of the reinforcement in the concrete mass. In this regard, it was noted that the particles of the abrasive, together with the upper polymer layer, exfoliate from the core during long-term operation.

Known composite polymer reinforcement, consisting of a supporting rod made of fiber composite material, on the surface of which a spiral winding is made, and a coating of quartz sand is also applied, and the spiral winding is made of a bundle of fibers of the same type twisted along its axis as the bearing rod (RU 143763 U1, 07.27.2014 - prototype). This reinforcement is obtained by the method of pultrusion, a fibrous filler, for example, basalt or glass roving, is pulled through a bath with an organic thermosetting epoxy resin. Excess resin is removed by squeezing the beam of rovings. Next, a spiral winding is wound on the surface of the rod, creating protruding ribs. After that, quartz sand is applied to the surface of the rod and the rod is fed into the furnace, where it solidifies. During curing, grains of sand, evenly distributed over the surface, are melted into the polymer matrix, forming a durable coating with a rough surface, which increases the adhesion strength of the reinforcement to concrete.

Common features of the utility model and prototype are that they relate to composite reinforcement comprising a core made of a plurality of glass fiber impregnated with a binder, a tourniquet wrapped around the core and granules connected to the core by a core located on the core. Moreover, the granules of the prototype are particles of quartz sand.

A significant disadvantage of the prototype is that the adhesion strength of the reinforcement to concrete due to the surface roughness of the reinforcement is insufficient, since during the operation of the concrete structure and reinforcement tensile and compressive, the reinforcement experiences alternating shear loads of the reinforcement relative to the concrete mass, while the particles of reinforcement sand work as 5

abrasives cutting grooves, grooves and channels in the concrete mass, which leads to an accelerated shear of reinforcement in concrete.

The technical result of the utility model is to increase the bond strength of reinforcement with concrete.

The indicated result was obtained in that the composite reinforcement comprises a core made of a plurality of fiberglass impregnated with a binder, a tourniquet wrapped around the core, and granules connected to the core connected by a core located on the core, each granule embedded in its core in one part and the other part of the granule extending from core in the direction from the longitudinal axis of the core, with the bundle located in the helical groove of the core, each granule is embedded in the core under pressure and in the hole for an hour s granule has a smaller volume compared to the volume of the other part of the pellets, which extends from the core.

In FIG. Figure 1 shows the reinforcement in cross section with one strand wound in a spiral around the core.

In FIG. Figure 2 shows the reinforcement in cross section with two strands wound in a spiral around the core.

In FIG. Figure 3 shows the reinforcement in cross section with two flattened strands wound in a spiral around the core.

In FIG. 4 is a diagram of the arrangement of granules in the wells of the core.

Composite reinforcement comprises a core 1 (Fig. 1-3) made of many fiberglass 2 impregnated with a binder, one winding bundle 3 or several winding bundles 3 of a core wound around the core in a spiral and impregnated with a binder, with which each bundle is connected to the core. Granules 4 connected to it by a binder material are located on the core. Granules of pebble, crushed stone or expanded clay are used as granules. The sizes of granules "in the light" are selected by calculation and experimentation. The processing of granules and their screening is performed by screening sieves.

The surface 5 of each granule (Fig. 4) forms with the surface of the core 6 a common working surface of the reinforcement. Granules are located on core 6

so that one part 7 of each granule (Fig. 4) is embedded in the core under pressure, this part of the granule is located in the hole 8 of the core, and the other part 9 of the granule extends from the core in the direction from its longitudinal axis and rises above the surface 6 of the core to a height h. This height is regulated by the diameter d = 2r of the reinforcement. The part of the granule introduced or recessed in the well has a volume V1 less than the volume V2 of the other part of the granule extending from the core (V2> V1).

The location of the granules 4 in the holes 8 of the core 1 increases the contact surface of each granule with the core, which increases the strength of the connection of the granules with the core. Granules can be made of any other materials having an optimal granular shape, providing the maximum possible adhesion to the core.

To increase the adhesion force of the bundles 3 to the core 1 by increasing the surface of the connection between the core and the bundles, the smaller lower part 10 of each bundle 3 (Fig. 2) is located in the helical groove 11, and the upper most part of the bundle 12 extends outward from the core. The helical groove 11 is made in the process of manufacturing the reinforcement. The groove 11 is made by introducing the tightened tow 3 into the core array during the manufacturing of the reinforcement, for which the hardness of the tow is selected more than the hardness of the core. In another case, a tourniquet is laid in a groove previously made in the core without being tensioned. These methods do not exclude other methods of connecting the bundles to the core.

The fittings are as follows. When the concrete structure is loaded, for example, when it is bent, the granules embedded in the core and the concrete mass most effectively resist the shear of the reinforcement relative to the concrete, which significantly increases the bearing capacity of the reinforcement to concrete and, accordingly, increases the strength of the concrete structure.

Claims (1)

Composite reinforcement comprising a core made of a multitude of fiberglass impregnated with a binder, a tourniquet wrapped around the core and granules connected to the core by a core located on the core, characterized in that each granule is embedded in one core of the core and the other part of the granule extends from the core into the direction from the longitudinal axis of the core, with the bundle located in a helical groove of the core, each granule is embedded in the core under pressure and a part of the gr nuly has a volume smaller than the volume in comparison with the other parts of pellets extending from the core.

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