CN102782229B - For improving the improvement reinforcing rib in reinforced concrete structure life-span - Google Patents
For improving the improvement reinforcing rib in reinforced concrete structure life-span Download PDFInfo
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- CN102782229B CN102782229B CN201180011929.9A CN201180011929A CN102782229B CN 102782229 B CN102782229 B CN 102782229B CN 201180011929 A CN201180011929 A CN 201180011929A CN 102782229 B CN102782229 B CN 102782229B
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- reinforcing bar
- muscle
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- reinforced concrete
- reinforcing rib
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
Abstract
Disclose a kind of improvement reinforcing rib and manufacture method thereof.Described improvement reinforcing rib is made up of high-strength material, has circular avette or oval cross section and have shaft distortion in one or more plane.The manufacture method of described improvement reinforcing rib comprises heat processing technique and cold machining process.Have shaft distortion wavy/fluctuation reinforcing bar can strengthen described reinforcing bar anchoring and bond strength in concrete when not carrying out any areal deformation.The amplitude of described reinforcing bar shaft distortion and pattern can avoid stress to concentrate and ill-effect.
Description
Technical field
The present invention relates to a kind of improvement reinforcing rib (REBAR); for improving steel concrete; the life-span of reinforced concrete structure and structure and steel concrete element; do not need to carry out any surfacing or surface protection to reinforcing rib; or add mixture in concrete, or do any other special preparation and effort after the making/manufacture of muscle.Even if when this muscle is made by high strength steel or any other material, described reinforcing rib has optical surface and deformed shaft.More specifically, the present invention relates to a kind of shape of the reinforcing rib for concrete construction and the new ideas of axle/surface configuration, and a kind of manufacture described in there is the method for the improvement reinforcing rib of optical surface (that is, without any surperficial lug/outstanding or depression).
Background technology
Concrete is the very measuring body material of one, but stretch-proof, bending, shear relative with distortion weak.In concrete structure or other reinforced concrete constructions, use reinforcing bar to offset shortcoming or the imbalance of these concrete performances.
The concept of steel concrete is proposed in 1850 by J.L. Lamb wave spy (JeanLouisLambot) the earliest, and first steel concrete roof is built in 1853 by F. Kai Genie (FrancoisCoignet).
Any have high-tensile material and all can be used to steel concrete, steel, has higher than concrete coefficient of elasticity and the coefficient of thermal expansion with concrete tight fit, is desirable with the material of reinforcing rib form for reinforced concrete construction.Steel also has the advantage of easily acquisition and relatively low cost.
Proposed in 1875 in 1874 and Hai Te (Hyatt) by W.E. Hua De (WEWard) respectively using the form caved in or give prominence to as the concept that reinforcing bar is out of shape.
Originally, steel reinforcing element is generally the forms such as net, expanded metal, grid, structural shape, plate.Nowadays, steel reinforcing element occurs mainly with rod and muscle form greatly.In the present invention, interested is with the rod iron/reinforcing rib of muscle form and the reinforcing rib of other suitable materials.
With regard to steel reinforcing rib, originally, when the reinforced concrete that adds with reinforcing rib starts to become a kind of common moderate strength structure, it was once made up of the mild steel of plain bar (Fig. 2) form, was the material that 250 Ns/square millimeter and ultimate tensile strength are no more than 340 Ns/square millimeter with optional yield strength.In India, moderate strength reinforcing bar (ultimate tensile strength is not less than 540 Ns/square millimeter) is introduced by official and is published in nineteen eighty-two by IS:432 (Part I).But material alterations have occurred and cold torsional deformation (CTD) circular section reinforcing bar, have proof stress 420 Ns/square millimeter (grade iron 415), within 1967, propose in India.CTD reinforcing bar forms a kind of special high-strength deformation (HSD) or high yield stress strength and deformation (HSDY) reinforcing bar (Fig. 3).A kind of typical CTD muscle illustrates in figure 3 a.
At about 1970, the CTD reinforcing bar of grade iron 415 instead of traditional light face low carbon steel reinforced bar of about 50% in India.At about 1978, be introduced into the CTD muscle that iron 500 makes.1980, thermo-mechanical processi (TMT) reinforcing bar was developed in worldwide, instead of CTD muscle gradually.In India, first TMT muscle proposed in 1992.Nowadays TMT muscle constitutes the most frequently used reinforcing rib form, and yield stress rises to 600 Ns/square millimeter.
High strength (yield stress or 0.2% proof stress be 415 Ns/square millimeter and more than) reinforcing rib made of steel, start to replace in the sixties in 20th century plain bar that mild steel makes, this reinforcing bar gives the high-strength reinforcing bar (compared to intensity in equivalent diameter and cross section or low-intensity muscle) that areal deformation has high strength, it may be necessary the bond strength that improves reinforcing bar and surrounding concrete or improves tension resistance and without the increase of any anchorage point of muscle in fact or the length of muscle to limit the lengthwise movement of reinforcing bar relative to surrounding concrete.So muscle has the distortion of surperficial lug or projecting form.In general, longitudinal rib also appears on the surface of muscle (Fig. 3 and Fig. 3 A).Such rib (namely with the rod of areal deformation) part is by pasting, and part is by frictional resistance and partly by interlocking or being inserted into tension stress.
Use the result of the reinforcing bar of the areal deformation with lug, the form such as outstanding more serious, can than there is no that the like configurations of areal deformation is more Zao is absorbed in accident condition using before because construct the reinforced concrete structure of this reinforcing bar, structure and element.
Central authorities' Public Works Department, the government department of India, technical bulletin 1/99, on February 18th, 1999, (chief engineer issued memorandum numbering CDO/DE (D)/G-291/57, Niermann. Ba Hawang, New Delhi-110011) (CentralPublicWorksDepartment, GovernmentofIndia, TechnicalCircular1/99, MemoNo.CDO/DE (D)/G-291/57dated18/02/1999 (issuedbyChiefEngineer (Designs), NirmanBhawan, NewDelhi-110011) technical bulletin 1/99) is published in, recently concrete be configured in suitable maintenance under successful operation show damage accident sign in 50 years later several years.
Si Wa meter R.N. (Swamy, R.N) (" infrastructure regenerates: the challenge of climate change and continuation-and design in order to intensity or durability? " India's concrete periodical, volume 81,7th, in July, 2007) think in the past in 20/30 in the performance in application life of existing structure and the most direct of the result brought and justifiable evidence, we faced by challenge to be worldwide basis facility system all degenerated with surprising, unacceptable speed being exposed in true environment.Si Wa meter also sighs with feeling that the not good performance of reinforced concrete structure allows people be difficult to accept, although have great development to the understanding of the mechanism of Scientific Engineering and material, structure.
What the not good performance of steel concrete brought is international crisis.The commentary of Si Wa meter is more based on his observation to concrete performance.It is noted herein that at present with the reinforced concrete construction of areal deformation, early stage durable concrete structure is made up of the reinforcing bar of not distortion so simultaneously.
Pa Pazhajisi V.G., Wa Yenasi C.G. and Fa Erdisi M.N. (" Physical and chemical characteristics acts on concrete durability " ACI material periodical, ACI, March-April, 1991) to disclose their paper in 1991, within 20 years before, be the unsatisfactory situation of durability of concrete structure especially reinforced concrete structure increasing time.
Here it is once more emphasized that, refers in the durability dissatisfactory of observation during this period of time and there is the performance of high strength with the reinforced concrete construction of areal deformation reinforcing bar, and this performance dissatisfactory is from use HSD reinforcing bar.
There is this situation, by HSD reinforcing bar upper lug or the outstanding coarse aggregate supported, prevent concrete and the infringement to the steel concrete life-span that the close contact had between areal deformation reinforcing bar brings.
Mo Hamode T.U., Ao Tesuji N. and Ji Sada M. (" corrosion based on the reinforcing bar in direction ", ACI material periodical, ACI, March-April, 1999) think at the experiment basis for clearance configurations Special Manifestations equally, show greatly macroelement and micro unit corrosion bottom steel horizontal direction and notched bars is more serious than plain steel-bar corrosion.
Card A.K., (" concrete structure-cement pH value and distortion reinforcing rib ", Correction for Indian Project association periodical, civil engineering department, volume 82, June calendar year 2001) explain the yield stress strain and stress on the full surface of CTD reinforcing bar, the surface strain of other HSD reinforcing bars is the same under service load condition with stress can reach yield stress level, because the existing lug at HSD surface or high yield stress strength and deformation (HYSD) reinforcing bar or the outstanding stress concentration phenomenon occurred.Card further illustrates, once the stress/strain of reinforcing bar reaches yield stress/strain level, such reinforcing bar will uncontrollablely corrode.
This is the internal characteristics of HSD reinforcing bar, can corrode very early like this and concrete construction with this kind of reinforcing bar can get into a difficult position very early with surperficial lug or outstanding reinforcing bar.
Card A.K., (" notched bars and the early stage predicament of concrete structure ", high speed Research Bulletin, study plate, India's road conference, No. 65 at a high speed, December calendar year 2001) based on several in the building of Calcutta Stochastic choice and the observation of bridge, compared to the concrete structure with light face mild steel reinforcement, the concrete structure with CTD reinforcing bar more early can enter predicament, no matter be which type of cement.
Further; above-mentioned prior art periodical and Moscow literary composition V. (editor; translated by V. Ke Likematuofu; " concrete and reinforced concrete is degenerated and protection "; nineteen ninety, english translation, original text Mil publishes; Moscow, nineteen eighty-three) disclose the durability of the concrete structure with HSD and HYSD reinforcing bar than the low order of magnitude with light circle mild steel reinforcement.
The discovery of Ke Likematuofu is because once surface strain and stress meet or exceed yield stress, really occur in HSD reinforcing bar, and more special in CTD reinforcing bar, the surface element of such reinforcing bar becomes unstable and has unstable surperficial reinforcing bar can not by alkaline pore water passivation in concrete.
CTD reinforcing bar can be considered to the reinforcing bar with areal deformation (Fig. 3), and is locked in and manufactures stress exceed yield stress on full surface, due to reverse/be out of shape a step in as manufacturing step cold state under surmount yield stress.
Card A.K., (" waterproof construction: challenge and solution ", new building material and the structure world, volume 11, publication 10,2006) further illustrate example and picture, cold twisting turns in the near future, and the reinforcing bar with areal deformation can start to corrode with height ratio.
This demonstrate that heavily stressed, especially stress exceedes yield stress, on the impact causing reinforcement corrosion.
Above-mentionedly refer in prior art file the problem that early stage decay and predicament are described in steel concrete, relevant with using areal deformation (Fig. 3) high strength cast iron, instead of the cement of other special shapes or the degenerating of environment for many years.The poorest in HSD reinforcing bar is CTD reinforcing bar.
Except the problem that this is relevant with using HSD reinforcing bar, the early ageing problem in concrete structure, especially when this structure is in salt water, just as salt when winter built in by bridge can to the place on road surface, and all types of concrete structure in coastal area.
Epoxy coating, the zinc-plated or stainless reinforcing bar with areal deformation have been used up most initial capital in these cases, but card A.K., (" FBEC reinforcing bar can not use ", India's concrete periodical, volume 78, in January, first, 2004) explain the life-span that the epoxy-coated reinforcement further increasing cost why can not be asserted increase reinforced concrete structure.Further, use epoxy-coated reinforcement that reinforcing bar and surrounding concrete can be caused not to bond and reinforced concrete structure can be made especially fragile in shock loads situation, such as when earthquake.
Card A.K. and Wei Jing S.K., (" reinforcement in concrete bridge life-span ", the world of new building material and structure, volume 15, issue-6, in December, 2009) explains that high cost is zinc-plated equally can not effectively protect HSD steel bar anti-corrosion to lose.Therefore manufacturer proposes that HSD reinforcing bar uses the combination of zinc coat and epoxy coating.But the epoxy coating on reinforcing bar can stop or reduce reinforcing bar and concrete laminating, thus under vibrations condition life-span of entail dangers to concrete structure.Expensive stainless steel, although not perishable, and the stickiness of surrounding concrete is very poor.
Nowadays fiber reinforced polymer reinforcing bar also has use in high corrosive environment.It can in a variety of forms, strengthens row, general rod, grid and a lot of other forms from spiral.A lot of business can be made with the thermosetting resin that reinforcing bar is all strengthened by nondirectional glass fiber.But such reinforcing bar is very expensive.Except high cost and fire line poor, fiber reinforced polymer reinforcing bar may bear the basic shortcoming of not enough and very poor between reinforcing bar and the concrete laminating of elasticity.
US4329825 discloses a kind of reinforcing rib for support and connection concrete structure, has prismatic hollow body, has front portion and covering part.Anterior feature has front end face for being installed on concrete column wall, the leptoprosopy of two longitudinal directions and two faces of reporting to the leadship after accomplishing a task.The design of these faces is to make covering cannot step up and unclamp front portion.Front portion provides a longitudinal centre groove and equidistant groove of reporting to the leadship after accomplishing a task, and intersection trench is used as index aperture so that drill-through afterwards, and these are all arranged to the long end receiving reinforcing bar.
It is stronger with more accurate steel concrete element and in order to impel the installation of this class component be connected and form that US5468524 discloses casting; provide a kind of field joint; comprise the cylindrical sleeve that general one side is opened; the thorax with axial elongation is used for receiving the reinforcing bar staggered; and providing internal whorl at the other end makes twisted steel protect another side, when the thorax of sealing another side after protection.The preferred taper of screw thread and thorax comprise the ring washer at inside axially extended interval.Side ports is provided at the two ends of thorax.The thorax wall thickness adjoining screw shell end can be increase to strengthen resistance to tension.The length of thorax account for the major part of cylindrical sleeve, takies very little axial space because be threaded.
US4143986 discloses a kind of stirrup and engages for end-to-end relation connection reinforcement rod, comprises the hollow steel pipe and joint or sleeve that are installed on for a pair and strengthen roller end face.The distortion of pipe is in inner surface and meets the upper distortion of rod and external surface distortion, is supplied to joint or sleeve connection.Joint or sleeve have inner surface and are out of shape consistent with tube outer surface.
US863959 discloses an effective reinforcement and strengthens for concrete, and artificial stone etc. build intention; Described muscle cross section is polygon and each mask has front projection and has the cross facet in each front, reduces the height that longitudinal center portion assigns to end points.But, consider from practice, although do not relate to taking into full account of durability, for the round bar (as described in Figure 3) of these types, make with high strength steel and become more popular.
The defect of the above-mentioned prior art mentioned is HSD reinforcing bar (Fig. 3) essence, such reinforcing bar can corrode very soon, be they disadvantageously: the distortion on (a) this kind of rebar surface causes apparent strain and stress raise and exceed yield strength, our stress concentration phenomenon of knowing i.e., (b) cold torsional deformation (CTD) reinforcing bar, in HSD, effect is the poorest, even if can be that the strain and stress of all surfaces surmounts yield stress intensity only in a part of manufacturing step, (c) Large strain/stress, especially yield stress strain/stress or stress overshoot yield stress intensity, the slip in face between (i) clipped wire can be caused, (ii) non-laminating corrosion, (d) HSD reinforcing bar, especially CTD reinforcing bar, surface strain/stress overshoot yield stress intensity, can not in inside concrete passivation, even if its pore water pH value is greater than 12.0, and the not passivation of instability when (e) exposing and therefore rebar surface and unprotect, and with surface strain/stress overshoot yield stress intensity, become the chief-criminal of corrosion, namely, oxygen, chloride etc. (even if reinforcing bar is in concrete), also the corrosion of more morning can be caused compared to the structure with light face mild steel reinforcement, therefore the strain and stress of plain steel-bar body structure surface can be passivated by the reinforcing bar lower than yield stress strain and stress and in concrete.
So compared to light face, unquestionable use, with the high strength cast iron of areal deformation, is cause the arch-criminal that nearly decades, concrete structure was puzzled in early days.
Therefore; make reinforced concrete structure and other durable structures; (a) is needed to provide a kind of product of improvement; a kind of steel reinforcement arm; can make with the steel that may be used for steel concrete of high strength or any other grade; even if without surfacing or surface protection; also can not as CTD easy corrosion the same as other HSD reinforcing bars; and (b) a kind of method manufactures described product; wherein said method can be any or need not a lot of addition thereto, compared to making common HSD reinforcing bar.
Summary of the invention
Goal of the invention
Basic object of the present invention is the defect overcoming prior art.
Another object of the present invention is to provide a kind of improvement reinforcing rib that can improve reinforced concrete structure, structure, element, steel concrete composite material equivalent life; do not need to do any or a lot of extra effort or do not need to bear extra charge, namely the face coat of reinforcing bar or plating are provided, in concrete, use mixture, concrete structural surface protection etc.
Another object of the present invention is to provide a kind of improvement reinforcing rib with optical surface and deformed shaft.
Another object of the present invention is the muscle using mild steel or moderate strength steel or high strength steel or any other material to manufacture a kind of improvement, containing surperficial lug/outstanding, depression or surface deformity, but has deformed shaft; Described muscle can have any cross section but not have sharp-pointed or local feature.
A further object of the present invention is to provide a kind of reinforcing bar without surperficial local feature, can not increase local stress and strain and can not be fast as there is the reinforcement corrosion of surperficial lug or depression.
Another object of the present invention is to provide a kind of improvement reinforcing rib of high performance-price ratio, and structure or concept are simple and easily manufacture and use.
Another object of the present invention is to provide a kind of method manufacturing improvement reinforcing rib.
The present invention relates to a kind of improvement reinforcing rib (REBAR) for reinforced concrete construction and reinforced concrete structure, comprising:
High-strength material;
Described muscle has circular or avette or oval cross section;
Described muscle has shaft distortion in one or more plane.
Be used for a method for the improvement reinforcing rib (REBAR) of reinforced concrete construction and reinforced concrete structure by hot-working manufacture, comprise step:
Make the steel billet of high strength cast iron;
Heat described steel billet again;
Steel billet described in rolling in rolling mill, obtains the reinforcing bar of desired size and shape (cross section);
Gear roller or other equipment or instrument is utilized to be out of shape by described reinforcing bar;
Alternatively, any heating/cooling processing is provided;
Cutter is utilized reinforcing bar cutting to be slit into the length of expectation;
Described muscle cools by cold bed.
Further, a kind of method being used for the improvement reinforcing rib (REBAR) of reinforced concrete construction and reinforced concrete structure by cold working manufacture, comprises step:
Make the steel billet of high strength cast iron;
Heat described steel billet again;
Steel billet described in rolling in rolling mill, obtains the reinforcing bar of desired size and shape (cross section);
Utilize cutter that described muscle is cut into the length of expectation;
Described muscle cools by cold bed;
Gear roller or other equipment or instrument is utilized to be out of shape by described muscle;
Alternatively, anneal to eliminate residual stress.
Accompanying drawing explanation
Fig. 1 show of the present invention may the cross section of forms containing some of any surperficial lug and outstanding and reinforcing rib (REBAR) containing any sharp-pointed or local feature.
Fig. 2 is the light circle stiffener of linear structure, is in daily use before introducing has the moderate tensile strength of areal deformation (Fig. 3 and Fig. 3 A) and the reinforcing bar of high strength.
Fig. 3 is typical with areal deformation but be the high strength reinforcing rib of linear structure, from 19th century 60, the seventies, instead of the plain bar that mild steel and middle strength steel are made.
Fig. 3 A is cold torsional deformation (CTD) reinforcing bar typically exceeding yield stress with surperficial lug and the outstanding and stress on whole surface.
Fig. 4 is with deformed shaft structure in the present invention, but the surface view (elevation) of reinforcing bar one end without any surperficial lug or outstanding or depression.
Fig. 5 is the surface elevation map of some muscle partial section in the present invention.
Fig. 6 is the schematic arrangement of the distressed structure making muscle.
Fig. 7 for make the deformation structure of (passing through hot-working) muscle and without the generalized flowchart of any controlled cooling or thermo-mechanical processi.
Fig. 8 for make the deformation structure of (passing through hot-working) muscle and through the generalized flowchart of optional controlled cooling (thermo-mechanical processi).
Fig. 9 for make the deformation structure of (passing through cold working) muscle and experience the generalized flowchart of optional controlled cooling (thermo-mechanical processi).
Figure 10 for making the generalized flowchart of deformation structure of (passing through cold working) muscle, after annealing (if necessary).
Detailed description of the invention
What the present invention relates to a kind of any expectation form and grade has deformed shaft but is the steel reinforcing rib of optical surface or the reinforcing rib (REBAR) of any other suitable material, for reinforcing element, the steel concrete element of steel concrete, reinforced concrete structure, compound structure and any other of Steel concrete need the concrete construction of the reinforcing rib using steel reinforcing rib or any other suitable material.This muscle has optical surface and deformed shaft, can be used for the concrete construction that all needs are strengthened and/or the structure needing to apply Reinforced Concrete Design and construction principle.(Fig. 4-6).According to the present invention, provide the smooth muscle with deformed shaft, it is wavy that it makes muscle look like in the perspective.The amplitude of described ripple and shape and corrugation pitch changeable from can be, to keep the chuck(ing) capacity of high/enhancing, namely, keep the overall linear feature of described muscle is not made any large compromise bonding or pulling test strength and avoid stress to concentrate and ill-effect, such as, the early stage corrosion of CTD and other HSD steel reinforcing bars.Preferably, but be not limited to, the amplitude range of the shaft distortion of muscle is 1 to 10 millimeters.
The invention further relates to the technique manufacturing described product, wherein there is the rectilinear reinforcement of the cross section (Fig. 1) of expectation under its plastic state, such as, majority of case, at the steel heat treatment temperature of about 900 DEG C to 1200 DEG C, realizes deformation structure by one or more groups toothed roller/gear or by other equipment/instruments similar.(Fig. 4-6)
The invention further relates to the technique manufacturing described product, wherein there is the rectilinear reinforcement of the cross section (Fig. 1) of expectation, lower than about 900 DEG C of heat treatment temperatures to 1200 DEG C (with regard to steel), be made with the shape (Fig. 4-6) of distortion.In this case, can be released by the stress locked owing to processing/bending at lower than mouldable state temperature, if needed, discharge by annealing/heating.
Indian Standard PLAINANDREINFORCEDCONCRETECODEOFPRACTICE (smooth and add putting into practice of reinforced concrete regulation) (the 4th edition), IS456:2000, clause 5.6 allows the use of reinforcing element in strengthening, like this
A) mild steel and medium tensile strength steel meet IS432 (Part I)
B) high-strength deformation reinforcing bar meets IS1786
C) hard draw steel gauze wire cloth meets IS1566
D) structural iron meets A grade in IS2062
Steel reinforcing rib described in above-mentioned (a) can be improved by the present invention.For also meeting other countries and international regulations while described in above-mentioned (b) (namely, BS4449, ASTMA615M, ASTMA706M, EN10080, Asia model code (AsianModelCode) 1999 etc.) the high strength cast iron with textured surface, the invention provides better substitute, because there will not be stress to concentrate the early stage corrosion caused with stress corrosion effect according to the present invention, and can strengthen bonding or strengthening slip resistance at reinforcing rib-concrete surface.Further, the probability losing contact between reinforcing rib and surrounding concrete is minimized.Make with deformed shaft instead of have deformity surface reinforcing rib to strengthen the basic scheme of slip resistance, use any other material reinforcing rib time be also available.
Other are domestic, foreign country, international regulation, standard, guide etc. allow to use some or all multi-form products indicated in above-mentioned (a)-(d) as reinforcing element, but this product can meet all some or entirely do not meet standard I S432 (Part I), IS1786, IS1566 and IS2062.
Except other metals and material, the present invention relates to the project of above-mentioned (a) and (b), but the present invention and product are not limited to the bar material for steel concrete and reinforced concrete construction or product that meet IS432 (Part I) or IS1786 or any other India or state's foreign goods international regulations or standard or guide specification.
According to the present invention, steel (or any other material system) reinforcing rib has circular avette or oval or any other cross section, but without any sharp-pointed angle/profile or without any sharp-pointed or local feature.But different from having the reinforcing rib that pure straight line or linear axis construct in prior art (Fig. 2 and 3), the reinforcing rib in the present invention, although keep basic line oriented, has non-rectilinear structure.Have multiple this reinforcing rib that may construct as shown in Figure 4, the surface elevation map of the partial section of one group of such muscle as shown in Figure 5.
steel
According to an aspect of the present invention, provide a kind of reinforcing bar (for reinforced concrete construction and reinforced concrete structure) with optical surface and deformed shaft, deformed shaft has and to add in reinforced concrete slip resistance to prevent early stage corrosion tendency, and this early stage corrosion may appear in HSD reinforcing bar (as Fig. 3 and Fig. 3 A).Cooling/the quenching (as thermo-mechanical processi or TMT technique) of any controlled reinforcing bar can be carried out after the formation of deformed shaft (Fig. 8), wherein reinforcing bar in the end step rolling mill technique (Fig. 6) distortion.In the alternative cold treatment process for reinforcing bar distortion, special cooling (as TMT technique), if carried out, carried out before reinforcing bar (Fig. 9 and 10) distortion.In cold machining process, after reaching the deformed shape (Figure 4 and 5) that light gluten (Fig. 1) expects, also can provide the residual stress (Figure 10) that optional annealing/heat treatment is used for discharging in any manufacture process.
material except steel
With advise here with deformed shaft but for the concept of linear element of the reinforcing rib of optical surface consistent, other non-Steel materials, if find suitablely to be used as reinforcing element, can manufacture as shown in Figure 6, and be formed in reinforcing element more useful in the design and structure of reinforcing rib concrete structure.These other materials can comprise glass fiber, carbon fiber or aramid fiber or other high-strength materials, and they can be manufactured by nanometer technology, or are not manufactured by nanometer technology.
distressed structure
According to the present invention, the shaft distortion pattern of reinforcing element is hard-core, as long as no causing as concentrated stress factor sharp-bend, the recess or outstanding that the great nominal stress produced due to stress concentration phenomenon is strengthened.
Although distressed structure can obtain at cold state, best (unstressed or low residual stress situation) rolling/process (Fig. 6 or any other layout), namely cause or affect reinforcing bar shaft distortion, it is (namely at mouldable state) acquisition under heat treatment temperature, when using steel, this temperature is 900 DEG C to 1200 DEG C.
Distressed structure completes by different modes, and one of them is for using band tooth roller/gear (Fig. 6).The axle of roller/gear can be level or vertical or tilt to mate condition of work.
The shaft distortion of muscle or other any reinforcing elements can in a plane or multiple plane.
According to of the present invention by not containing any areal deformation but there is the muscle that the high strength steel of deformed shaft (Fig. 4-6) or any other steel or any other material make can effectively for reinforced concrete construction, because the resistance to plucking resistance of this new muscle (Fig. 4-6), compared to having same size (diameter) and material but not having areal deformation or do not have the similar resistance to plucking resistance of the light of shaft distortion circle muscle (Fig. 2), can reach large 50%-70% even larger easily.
Here it is pointed out that the resistance to plucking resistance experiment of HSD reinforcing bar (Fig. 3 and Fig. 3 A), as the similar regulation defined of IS:1786 and IS:2770 and other countries, in essence with details is arbitrary.The arbitrariness of the requirement of this test bond strength is embodied by following experiment method,
A) test is carried out on single muscle, and in most of truth, multiple reinforcing rib is adjacent one another are and arrive and put, and in each muscle, tensile force affects the resistance to plucking of muscle and the performance of resistance to tension around it.
B) test of tension and resistance to plucking resistance is carried out when 5 times of (clause 4.7 and IS:1786 in appendix A) bar diameter depths imbedded by reinforcing bar, test different-diameter and the reinforcing bar of different brackets steel, and do not consider same size but the reinforcing bar of different materials can produce the fact of different tensile stresss.Further, in reinforcing bar, tensile stress changes with diameter quadratic power instead of with diameter usually.
C) bond strength is determined by test (clause 4.7 and IS:1786 in appendix A), but does not clearly use bond strength in the design.
Like this, although the reinforcing rib in the present invention does not have the areal deformation of prior art muscle, even and if the bond strength of reinforcing rib of the present invention does not have similar essence compared to the bond strength of prior art, and it does not affect in fact the work of reinforcing rib of the present invention.
Smooth gluten of the present invention, any areal deformation of lug, (Fig. 4-6) form such as outstanding is not had with deformed shaft, can be made up of high strength steel, and can as effective use the HSD reinforcing rib with areal deformation (Fig. 3), have with use the concrete structure of plain round bar (Fig. 2) and other construct the same durability, and have and construct the same economy with the concrete structure of use HSD reinforcing bar with other.That is, reinforcing bar of the present invention or reinforcing element owing to remaining the surface characteristics of plain steel-bar (Fig. 2) in first 50 years of 20th century, thus have plain steel-bar and the high strength cast iron best quality with areal deformation simultaneously.So reinforcing bar of the present invention can be made up of the steel of same high strength making HSD muscle (Fig. 3), and these new muscle of the present invention are compared with traditional HSG muscle, in use efficiency is higher and effect is more obvious.Because (namely muscle of the present invention does not have the shortcoming of HSD reinforcing bar, the stress of stress corrosion can be caused to concentrate, gap between reinforcing bar and concrete, macroelement and micro unit corrosion etc.), can give reinforced concrete structure, reinforced concrete construction, mixed construction and other strengthen concrete elements and the same life-span during use plain steel-bar.In addition, do not need to carry out the coating of any high cost surface unlike, reinforcing rib of the present invention with HSD reinforcing bar.
Muscle of the present invention is not restriction and restriction in length.Similar, muscle of the present invention or the size (diameter) of any other reinforcing element all there is no the restriction of lower limit and the upper limit.Therefore according to the present invention, the size of muscle except can be 4 millimeters to 50 millimeters, specified by the clause 5.1 of IS:1786, the muscle of other intermediate sizes and to be less than 4 millimeters or the reinforcing bar that is greater than 50 millimeters be all operable and be all allow.
Similar, except reinforcing bar, the present invention also comprises the reinforcing rib that other metals and material are made.
According to the present invention, deformed shaft does not limit, except non-required avoids sharp profile from the deformation extent of its original rectilinear state (Fig. 4-6).Further, axle can at a plane or multiple plane internal deformation.But overall rectilinear direction is kept.Distance between two continuous print crests and trough (being generated by reinforcing rib deformed shape) does not have upper and lower bound to limit, as long as they are in using with within the scope of slip resistance of reinforcing rib.
Experiment shows that amplitude or deviation deflect away from 2-3 millimeter from d-axis, the resistance to plucking resistance (table 1) of plain steel-bar can be improved 50%-70%.The suitable degree of distortion and the form selected can further improve resistance.Consider field condition based on object of the present invention, the axle of suggestion muscle is 1 millimeter to 10 millimeters by the distortion/depart from of its normal straight state.
Although for reinforced concrete structure rod iron (any expectation/allow, there is any and all actual grades, intensity, toughness, metallurgy that is flexible and/or any other interested character forms) be research emphasis of the present invention, basic characteristic of the present invention comprises the rod of steel or any other material (comprising composite material), muscle, plate and other shapes, object is the ill-effect avoiding stress to concentrate, obtain reinforcing element (such as reinforcing rib) at another kind of or multiple material (such as concrete simultaneously, plaster) high slip resistance in matrix or to the high resistance bonding inefficacy.
According to the present invention, hot-working (during material mouldable state) and cold working are all feasible.
As shown in FIG. 7 and 8, when adopting hot-working (optionally carry out/do not carry out any controlled cooling or thermo-mechanical processi) for the formation of muscle distressed structure, processing step is:
Make the steel billet of high strength cast iron, heat described steel billet again, steel billet described in rolling in rolling mill, obtain the reinforcing bar of desired size and shape, gear roller or other equipment or instrument is utilized to be out of shape by described reinforcing bar, alternatively, provide any heating/cooling processing as thermo-mechanical processi, utilize cutter reinforcing bar cutting be slit into the length of expectation and cooled by described reinforcing bar on cold bed.
As shown in Figures 9 and 10, when adopting the cold working with controlled cooling or thermo-mechanical processi (alternatively, annealing thereafter) to form reinforcing bar distressed structure, the step of technique is:
Make the steel billet of high strength cast iron, heat described steel billet again, steel billet described in rolling in rolling mill, obtain the reinforcing bar of desired size and shape, carry out alternatively heating/cooling processing as thermo-mechanical processi, utilize cutter reinforcing bar cutting to be slit into the length of expectation, described reinforcing bar cools by cold bed, utilize gear roller or other equipment or instrument to be out of shape by described reinforcing bar, alternatively, carry out annealing to eliminate residual stress.
Further, when using hot-working and cold working to reach the deformation structure of reinforcing bar, optionally can carry out fractionalism and other quality examinations in above-mentioned steps simultaneously.
As one of result of the present invention, when carrying out hot-working when being included in material mouldable state in deformation technique, do not need to provide any post processing.But muscle is without any need for post processing.If the need arises, can provide by annealing (in cold working situation) or any other post processing (such as, controlled cooling, as thermo-mechanical processi) eliminate stress.
Table 1, resistance to plucking resistance
Attention:
*figure show value for derive from particular experiment.The amplitude of distortion and plane can be changed and resistance to plucking resistance can be strengthened.
Claims (11)
1., for an improvement reinforcing rib for reinforced concrete construction and reinforced concrete structure, comprising:
A) Steel material;
B) described muscle has optical surface and circular or avette or oval cross section;
C) described muscle has shaft distortion in specific plane, and the amplitude of described shaft distortion is 1 to 10 millimeter;
Described muscle is without any the areal deformation of lug and projection form.
2., according to the muscle described in claim 1, wherein said shaft distortion provides gentle wavy configuration for described muscle.
3., according to the muscle described in claim 1, wherein said distortion is in a plane or multiple plane.
4., according to the muscle described in claim 1, wherein said muscle is round-shaped.
5. the muscle according to any one of claim 1-4, wherein said muscle has optical surface and deformed shaft.
6. be used for a method for the improvement reinforcing rib of reinforced concrete construction and reinforced concrete structure by hot-working manufacture, comprise step:
Make the steel billet of reinforcing bar;
Heat described steel billet again;
Steel billet described in rolling in rolling mill, obtains the reinforcing bar of desired size and shape;
Gear roller is utilized to be out of shape by described reinforcing bar; Any heating/cooling/Quenching Treatment is provided, utilizes cutter that described reinforcing bar cutting is slit into the length of expectation, and on cold bed, described reinforcing bar is cooled.
7. be used for a method for the improvement reinforcing rib of reinforced concrete construction and reinforced concrete structure by cold working manufacture, comprise step:
Make the steel billet of reinforcing bar;
Heat described steel billet again;
Steel billet described in rolling in rolling mill, obtains the described reinforcing bar of desired size and shape;
Utilize cutter that described reinforcing bar cutting is slit into the length of expectation;
Described reinforcing bar cools by cold bed;
Gear roller is utilized to be out of shape by described reinforcing bar;
If needed, anneal to eliminate residual stress to described reinforcing bar.
8., according to the method for the manufacture improvement reinforcing rib described in claim 6 or 7, after the step of wherein said steel billet described in rolling in rolling mill, described muscle is quenched.
9., according to the method described in claim 6 or 7, after the step of wherein said steel billet described in rolling in rolling mill, carry out the quality examination of fractionalism further.
10. according to the method described in claim 7, after the wherein said step that described reinforcing bar is out of shape, described reinforcing bar is annealed, eliminated by the method for heating and cooling gradually or reduce inherent residual stress.
11. according to the method described in claim 6, and wherein said hot processing temperature is between 900 DEG C to 1200 DEG C.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN197KO2010 | 2010-03-02 | ||
| IN197/KOL/2010 | 2010-03-02 | ||
| PCT/IB2011/000355 WO2011107848A2 (en) | 2010-03-02 | 2011-02-22 | Improved reinforcing bar and method for manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102782229A CN102782229A (en) | 2012-11-14 |
| CN102782229B true CN102782229B (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180011929.9A Expired - Fee Related CN102782229B (en) | 2010-03-02 | 2011-02-22 | For improving the improvement reinforcing rib in reinforced concrete structure life-span |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US20120328896A1 (en) |
| CN (1) | CN102782229B (en) |
| IN (1) | IN2012KN02822A (en) |
| WO (1) | WO2011107848A2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITBO20130089A1 (en) * | 2013-02-28 | 2014-08-29 | Elas Geotecnica Srl | REINFORCEMENT, STRUCTURE AND PROCEDURE FOR UNDERGROUND CONSTRUCTION OF REINFORCED CONCRETE |
| WO2014182825A2 (en) | 2013-05-07 | 2014-11-13 | Neuvokas Corporation | Method of manufacturing a composite material |
| CN103590538A (en) * | 2013-11-07 | 2014-02-19 | 于国友 | Non-circular rib for concrete |
| JP6514856B2 (en) * | 2014-05-30 | 2019-05-15 | 高周波熱錬株式会社 | Design method of reinforced concrete structure and reinforced concrete structure |
| JP6499421B2 (en) * | 2014-11-14 | 2019-04-10 | 東京鐵鋼株式会社 | Shear reinforcement and rebar assembly |
| US10682818B2 (en) | 2015-07-02 | 2020-06-16 | Neuvokas Corporation | Method of manufacturing a composite material |
| BE1023762B1 (en) * | 2016-01-12 | 2017-07-14 | Plakabeton Nv | CONSTRUCTION ELEMENT FOR THE CONCLUSION OF A CONNECTION BETWEEN THERMAL INSULATED PARTS OF A BUILDING |
| US10422137B2 (en) * | 2016-11-28 | 2019-09-24 | Korea Institute Of Civil Engineering And Building Technology | Heat shrinkable tube-covered rebar and method of preventing rebar from corroding using the same |
| US11919254B2 (en) | 2019-11-12 | 2024-03-05 | Neuvokas Corporation | Method of manufacturing a composite material |
| CN112139239B (en) * | 2020-08-11 | 2023-04-14 | 柳州钢铁股份有限公司 | Split reinforcing steel bar with small performance line difference |
| CN112139240B (en) * | 2020-08-11 | 2023-04-07 | 柳州钢铁股份有限公司 | Production method for reducing performance line difference of reinforcing steel bar |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102782229A (en) | 2012-11-14 |
| WO2011107848A3 (en) | 2011-11-03 |
| US20120328896A1 (en) | 2012-12-27 |
| WO2011107848A2 (en) | 2011-09-09 |
| US20190161968A1 (en) | 2019-05-30 |
| WO2011107848A4 (en) | 2011-12-22 |
| IN2012KN02822A (en) | 2015-07-24 |
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