RU96147U1 - COMPOSITION FITTINGS - Google Patents

Abstract

 Composite reinforcement, comprising a bearing rod made of high-strength polymeric material and a winding with ledges created by spiral winding of bundles and tapes, characterized in that the reinforcement is made with anchor thickenings repeated along the length of the reinforcement, made by spiral winding of two opposite winding directions with variable steps repeating along the length of the reinforcement windings.

Description

The utility model relates to construction, namely to reinforcement of a periodic profile, which can be used both for reinforcing ordinary concrete and asphalt concrete products, as well as for prestressed building structures.

Known fiberglass reinforcement according to the patent of the Russian Federation No. 2194135 (publ. 10.12.2002) containing a supporting rod of high-strength polymer material and a winding with ledges. The steps are made in the form of a bundle of threads impregnated with a polymer binder and spirally applied with an interference fit equal to 1/2 ÷ 1/10 of the diameter of pressing the bundle into the surface of the supporting rod, the diameter of the winding of the bundle is up to two diameters of the supporting rod, and the step of winding the bundle is made constant along the length fittings.

The disadvantage of this reinforcement is the low degree of adhesion to concrete.

Known embodiments of the composite reinforcement according to the patent for PM No. 77310 (publ. 20.10.2008), comprising a supporting rod of high-strength polymer material and a winding made of braids or a winding tape of one or opposite directions of winding, and the ratio of the areas of the winding bundle and the winding tape is in ranges from 1 to 150, and the winding step is made constant along the length of the reinforcement.

The disadvantage of such reinforcement is the low degree of adhesion to concrete.

Known rod for reinforcing concrete structures according to patent for invention No. 2249085 (publ. March 27, 2005), made of roving of mineral fiber fastened with a cured mineral binder and having anchor hooks in the form of conical-cylindrical thickenings along the entire length, moreover, the distance between the anchor hooks is from 50 to 200 rod diameters.

The disadvantage of this reinforcement is the low degree of adhesion to concrete.

The proposed utility model solves the problem of creating composite reinforcement with increased anchoring ability.

To achieve the specified technical result in composite reinforcement containing a supporting rod of high-strength polymer material and a winding with ledges created by spiral winding of bundles and tapes, the ledges are made in the form of anchor thickenings repeated along the length of the reinforcement, made by spiral winding of two opposite directions of winding with repeating along the length of the reinforcement variable winding steps.

Distinctive features of the proposed utility model from the closest analogue indicated above is that the steps are made in the form of anchor thickenings repeated along the length of the reinforcement, made by spiral winding of two opposite winding directions with variable winding steps repeated along the length of the reinforcement.

Thanks to these features, a new type of composite reinforcement has been created, which has increased adhesion to concrete.

The proposed design is illustrated by the drawings shown in figures 1-4.

Figure 1 shows the composite reinforcement with a surface relief created by a winding bundle of one direction of winding, with variable winding steps.

Figure 2 shows the composite reinforcement with a surface relief created by a winding bundle and a tape in the opposite direction of winding, with variable winding steps.

Figure 3 shows the composite reinforcement with a surface relief created by a winding bundle of one direction of winding, with a variable winding pitch and anchor thickenings.

Figure 4 shows the composite reinforcement with a surface relief created by a winding bundle and tapes of the opposite direction of winding, with variable winding steps and anchor thickenings.

The composite reinforcement comprises a supporting rod 1 (Figs. 1-4) of high-strength polymer material (for example, glass, basalt and other fibers) and spiral windings of one direction of winding 2 (Figs. 1, 3) and of the opposite direction 3 (Fig. 2, four). The windings are made of the same fibers and impregnated with epoxy compound.

In the reinforcement shown in Fig. 1, the winding of one winding direction is made with a repeating group of variable winding steps along the length T. The winding step along the length T varies from t ₁ to t ₂ . The diameter of the reinforcement at different winding steps is the same and equal to D.

In the reinforcement depicted in Fig. 2, the windings of opposite winding directions are made with a repeating group of variable winding steps along the length T. The winding step along the length T at the first winding varies from t ₁ to t ₂ , and the step at the second winding is t ₃ The diameter of the reinforcement at different winding steps is the same and equal to D.

In the reinforcement depicted in figure 3, the winding of one direction of winding is made with variable winding steps at a length T and anchor thickenings 4. The winding step at a length T varies from t ₁ to t ₂ . The diameter of the reinforcement in the zone of steps t ₂ has the value D, and in the zone of anchor thickenings at step t _{1 it} is equal to the value D ₁ with D ₁ > D.

In the reinforcement shown in Fig. 4, the windings of opposite winding directions are made with variable winding steps along the length T and anchor thickenings 4. The winding step in the length T for the first winding varies from t ₁ to t ₂ , and the step at the second winding is the value of t ₃ . The diameter of the reinforcement in the zone of steps t ₂ has the value D, and in the zone of anchor thickenings at step t _{1 it} is equal to the value D ₁ with D ₁ > D.

Comparative tests were carried out to determine the adhesion with aerated concrete of the Liana basalt-plastic reinforcement (patent PM No. 82246) for various types of relief. All tested reinforcement samples had a supporting rod with a design diameter of d = 3.5 mm, the first winding was made of a basalt tow with a diameter of 2.5 mm, and the second winding was carried out by basalt roving with a density of 1260 tex.

Adhesion with concrete was determined by the efforts of pulling reinforcement samples from foam concrete with a density of D 600 (weight 1 m ^{3 of} foam concrete in a dry state) with a pouring length of 300 mm.

In the first embodiment, the reinforcement according to the prototype had a single-start winding from a bundle with a pitch of 15 mm, the outer diameter of the reinforcement was D = 6 mm. The number of anchoring turns n = 20, the anchoring area (side surface of the windings) F _a = 242 mm ² .

In the second embodiment, the prototype reinforcement had a winding of opposite directions of winding with a pitch of 15 mm. The outer diameter of the reinforcement was D = 6 mm. The number of anchoring turns n = 20, the anchoring area F _a = 242 mm ² .

In the third embodiment, the reinforcement had a single-start winding from a bundle with a repeating group of variable winding steps at a length T = 300 mm (Fig. 1). At a length T with a minimum winding pitch t ₁ = 2.5 mm, the number of turns was 4 turns with a smooth transition through 5 turns to a step t ₂ = 15 mm. Outer diameter D = 6 mm. The number of anchoring turns n = 24, the anchoring area (side surface of the windings) F _a = 290 mm ² .

In the fourth embodiment, the reinforcement had a winding of opposite directions of winding with a repeating group of variable winding steps at a length T = 300 mm (figure 2). With a minimum winding pitch t ₁ = 4 mm, the number of turns was 4 turns with a smooth transition through 5 turns per step t ₂ = 15 mm. Outer diameter D = 6 mm. The second winding is made with a pitch t ₃ = 15 mm. The number of anchoring turns n = 24, the anchoring area F _a = 290 mm ²

In the fifth embodiment, the reinforcement had a single-start winding from a bundle with a repeating group of anchor thickenings and variable winding steps at a length T = 300 mm (Fig. 3). Anchor thickenings with an outer diameter of D ₁ = 10 mm are made at t ₁ = 1 mm over a length of 10 mm. The transition to the step t ₂ = 15 mm was carried out with a smooth transition through 5 turns. The outer diameter of the reinforcement in the t ₂ zone is D = 6 mm. The number of anchoring turns n = 24. The total anchoring area is 352 mm ² , of which the turn area is 290 mm ² , and the anchor area is 62 mm ² .

In the sixth embodiment, the reinforcement had a winding of opposite directions of winding with a repeating group of anchor thickenings and variable winding steps at a length T = 300 mm (Fig. 4). Anchor thickenings with an outer diameter of D ₁ = 12 mm are made at t ₁ = 1 mm over a length of 15 mm. The transition to the step t ₂ = 15 mm was carried out with a smooth transition through 5 turns. The second winding is made with a pitch t ₃ = 15 mm. The outer diameter of the reinforcement in the zone t ₂ is D = 6 mm, the number of anchor coils n = 24. The total anchoring area is 387 mm ² , of which the turn area is 290 mm ² , the anchor area is 97 mm ^2. The test results are shown in the table, where F _a is the anchor area of the reinforcement (side surface of the windings and thickening) mm ² ,

P - force pulling reinforcement from foam concrete, kgf.

R _Ud - specific force pulling reinforcement from foam concrete, kgf / cm

table Execution option F _a mm ² R kgf P _beats kgf / cm note 1 prototype 242 1050 35 A break in the diameter of the reinforcement is 6 mm. Pulling 2 windings 2 prototype 242 1200 49 6 mm diameter gap without damage to the windings 3 290 1150 38 A break in the diameter of the reinforcement is 6 mm. 4 windings four 290 1340 44 6 mm diameter gap without damage to the windings 5 352 1400 46 A break in the diameter of the reinforcement is 10 mm. with damage to windings and anchor 6 387 1560 52 A break in the diameter of the reinforcement is 12 mm. without damaging the windings and anchor

Samples of Liana fittings were manufactured at the technological line of the enterprise KNPO Ural Reinforcing Company LLC, Perm (). The results of tests for tearing out reinforcement samples from foam concrete castings show that a periodic decrease in the winding pitch slightly by ≈10% increases the adhesion forces for both types of reinforcement winding directions. In the case of performing on reinforcement with a variable winding step of anchor thickenings, pulling forces increase significantly. The best result was achieved when testing sample 6 with reinforcement, the anchor thickenings of which are strengthened by a second winding in the opposite direction of winding. An increase in pull-out forces of more than 50% practically correlates with an increase in the anchoring area and exceed the same values for composite reinforcement with a constant winding pitch.

The proposed composite reinforcement with variable winding steps and anchor thickenings increases the adhesion of the reinforcement to concrete, in particular with cellular concrete, which increases the bearing capacity of building structures.

Claims (1)

Composite reinforcement, comprising a bearing rod made of high-strength polymeric material and a winding with ledges created by spiral winding of bundles and tapes, characterized in that the reinforcement is made with anchor thickenings repeated along the length of the reinforcement, made by spiral winding of two opposite winding directions with variable steps repeating along the length of the reinforcement windings.