Method of rolling hot-rolled section reinforcement bars

FIELD: process engineering.

SUBSTANCE: invention relates to construction reinforced concrete structures. To increase adhesion between reinforcements and concrete, load bearing capacity in compression, and fire resistance, rolled section reinforcements are rolled from tubular billets of alloyed steel "25Г2С", "30ХГ2С", "35ГС" intended for reinforced concrete structures, and reef-like ledges are rolled on their surface. Note here that said ledges are rolled in hot state by transverses rolling along left of right mono- or multifilar helix.

EFFECT: higher adhesion.

1 tbl, 2 dwg

 

The present invention relates to the construction and reinforced concrete structures and their reinforcement.

Known hot-rolled reinforcement bars periodic profile, steel alloy 35GS, GS, GS. This valve is provided with ridges (reefs) to increase its coupling with concrete [1, p.36], [2, pp. 102], and ridges form a car in the hot condition in the longitudinal direction. Also known rigid reinforcement of the rolling elements and its application in monolithic structures.

Take a well-known fixture for the prototype. The disadvantage of the prototype is that for docking fittings have to use manual welding, the process is not technological. The process of manual docking of reinforcement cages has increased the complexity, and on the construction site automation of this process complicated. In winter conditions manual welding significantly reduces the quality and reliability of connections and, consequently, of the entire structure. The valve has an excessive flexibility that limits its application as hard to maintain the suspended formwork.

Known patent: "method for the production of rebars" EN 2306989 C2. This patent describes a method for the production of rebar, including multi-pass compression strip in the exhaust system calibers oval-circle with the formation of the intermediate section of the passage is of ROFILE in the form of an oval with a long concave sides, in finishing profile with screw tabs, characterized in that the ratio of the height of the oval to its width is 2.3...2,5, finishing the passage form a profile in the form of two symmetric arcs of the same circle with radius equal to the radius of the oval conjugate between a rectilinear areas, and in finishing the pass band compresses with extraction of 1,3-1,5.

Three figures clearly shows that the cross section is not round and has a straight-line portions where the protrusions are not. In the patent RU 2306989 perform longitudinal rolling. Screw the tabs are interrupted on two sides by straight sections section that weakens the screw connection under tension.

Known patent: "method for the production of rebar" EN 2346991 C2. The invention and its formula is given intervals of different chemical composition: carbon 0.14-0.26%; silicon, 0.05-0.30%manganese, not more than 1.0%; chromium not more than 0.3%;

Nickel is not more than 0.3%; copper not more than 0.4%; impurities: sulfur is not more than 0.050%; phosphorus not more than 0.040%, nitrogen not more than 0.012%; iron - rest. In the patent RU 234699 perform longitudinal rolling.

Known patent for utility model RU 6714040 U1, which shows the effectiveness of the tubular reinforcing profiles.

The analysis of these sources shows that they perform rolling mill longitudinal rolling.

In n the Shem case screw fittings rolled tubular profile, and it combs roll (running-in) hot cross knurling on the right or left helical spiral single or multiple.

Obviously, the reliability and manufacturability of compounds easily increase when connecting fittings nuts. Consequently, the ridges on the surface of the tubular blanks should be cross knurl knurling along a helical spiral, and it is not chaotic.

Increasing the external surface of the valve in contact with the concrete, increase the adhesion of the reinforcement to the concrete and, therefore, its anchoring. It is also clear that increasing the diameter of the valve, without increasing the cross-sectional area, increases the carrying capacity of the valve during its compression and bending. Therefore, to enhance the performance of reinforced concrete structures should be laminating the reinforcement of tubular workpieces with a cavity inside.

In addition, in case of fire and the temperature rise of the armature to 600°C the modulus of elasticity of steel reinforcement tends to zero and the collapse of the structure. If the valve is to perform a tubular profile, the valve can easily be cooled by pumping water through it and thereby eliminate the possibility of collapse of the structure during the fire.

In addition, the reinforcement tubular profile with the ridges of the knurled cross NAC is rigid in the hot condition on the right or left helical spiral single-thread or multiple - expands the scope of its application for anchor bolts, columns, machines and so on.

The technical object of the invention to increase the adhesion of the reinforcement to increase its surface contact with the concrete, increase the bearing capacity of the reinforcement when working in compression, the increase of the efficiency of splicing and reliability of the joints of the valve, increasing the fire resistance of the construction and expansion of scope.

The technical problem by the method of rolling deformed bars alloy steel 35GS, GS, GS for concrete structures and supply its crests (reefs) is solved as follows.

The difference is that the valve rolled tubular profile. And ridges on the surface of the roll (running-in) hot cross knurling on the right or left helical spiral single or multiple.

Increase the fire resistance of reinforced concrete structures, in the event of a fire, reached by pumping water through the tubular valve. The signal for pumping cooling water is supplied from the temperature sensors inside the building.

Figure 1 shows a hot-rolled tubular profile fittings periodic profile with right or left helical spiral single or multiple; figure 2 is a transverse section of it.

Hot-rolled tubular profile fittings 1 sod is RIT external ridges 2, which rolls cross knurling in the hot condition on the right or left helical spiral single or multiple.

For example, when replacing the valve rod diameter ⌀60mm equivalent in cross-sectional area of the tubular profile, the moment of inertia in bending increases 16,56 times!

The diameter ⌀ mmThe cross-sectional area, cm2Weight, kg/mMoment of inertia Jxcm4The radius of gyration ixcm
Similar60of 28.2722,1963,6 (100%)1,5
New tubular profile180×527,4a 21.51053,3 (1656%)of 5.06

Comparison with similar [1, p.36] shows the following significant differences:

- hot rolled rebar periodic profile alloy steel 35GS, GS, GS supply crests on the right or left helical spiral single or multiple. Reinforcement of good is to see a tubular profile, and it combs roll (running-in) cross knurling in a hot state;

the clutch armature is increased in proportion to the increase of the surface of its contact with the concrete, that is ≈ 3 times;

- bearing capacity of the reinforcement when working in compression is increased in proportion to the reduction of its flexibility, and the radius of gyration increased ≈in 3,37 times;

adaptability splicing and reliability of the joints of the valve is increased, as applied bolting with high resource [5, s.138];

- improved fire resistance design and expanded the scope of application of the new tubular profile of the valve with the ridges of the knurled cross knurling on the right or left helical spiral single or multiple.

Sources of information

1. Reinforced concrete structures. General course / Wenbian, Eeshlo. - M.: stroiizdat, 1991, 767 S.

2. Reinforced concrete and masonry design: a Tutorial for building specialties / Wmmintrin.h, Ugunsgreka, Weimin; edited Wmmintrin.h - M.: Higher school, 2007, 887 S.

3. Great encyclopedic dictionary (BAS). Editor Amerkhanov. - M.: Scientific publishing house "GREAT RUSSIAN ENCYCLOPEDIA", 1998, 1456 S.

4. Nezhdanov K., V.A. Tumanov, Nezhdanov A.K. Anchor device. Patent of Russia №2228405. 02D 27/50, EV 1/38. Bull. No. .13. 10.05.2004.

5. Reference cranes: TT I. material properties and loads. The basis of calculation of valves, actuators and metal structures // Weisbrode, Mel, Yesway etc.: Ed. MAG - M.: Mashinostroenie, 1988, 536 S.

Method of rolling deformed bars of alloy steel GS, GS, 35GS for concrete structures, comprising hot rolling the reinforcement of the tubular workpiece and the knurled ridges on its surface in the form of reefs, with crests rolled hot cross knurling on the right or left single or multiple coil spiral.



 

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1 tbl

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1 tbl

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1 ex, 1 tbl

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1 ex, 1 tbl

FIELD: metallurgy.

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3 cl, 3 tbl

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1 ex, 2 tbl

FIELD: metallurgy.

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EFFECT: increased level and stability of mechanical properties at simultaneous reduction of manganese concentration.

4 cl, 3 ex, 2 tbl

FIELD: metallurgy.

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EFFECT: optimisation of rolling process, reduction of power inputs, productivity gain, increasing of accuracy and quality of products.

2 cl, 2 dwg

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