WO2021114558A1 - 中空螺纹钢筋及使用中空螺纹钢筋的混凝土结构 - Google Patents

中空螺纹钢筋及使用中空螺纹钢筋的混凝土结构 Download PDF

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WO2021114558A1
WO2021114558A1 PCT/CN2020/088962 CN2020088962W WO2021114558A1 WO 2021114558 A1 WO2021114558 A1 WO 2021114558A1 CN 2020088962 W CN2020088962 W CN 2020088962W WO 2021114558 A1 WO2021114558 A1 WO 2021114558A1
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threaded steel
steel bar
content
hollow threaded
hollow
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PCT/CN2020/088962
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English (en)
French (fr)
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翟平
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郑州固德永建筑设备租赁有限公司
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel

Definitions

  • the invention belongs to the technical field of concrete structures and threaded steel bars for building construction, and more specifically, relates to a hollow threaded steel bar and a concrete structure using the hollow threaded steel bar.
  • the concrete rebar (also called finish rolled rebar, hereinafter referred to as finish rolled rebar) is a straight bar of large diameter, high strength, and high dimensional accuracy with external threads rolled on the whole rebar.
  • the steel bar is screwed on a connector with internal threads for connection or screwed on a screw cap for anchoring at any cross section.
  • Finish-rolled threaded steel bars are widely used in large-scale water conservancy projects, continuous beams and large-scale frame structures in industrial and civil buildings, highways, railways, large and medium-span bridges, nuclear power plants, and ground anchors. It has the advantages of simple connection and anchoring, strong adhesion, safe and reliable tension anchoring, convenient construction, etc., and it saves steel bars and reduces the area and weight of components.
  • Chinese Patent CN103898408B discloses a 700MPa grade rebar and its production method.
  • the rebar contains the following basic components: C0.28 ⁇ 0.32%, Si0.40 ⁇ 0.80%, Mn1.20 ⁇ 1.60%, V0.18 ⁇ 0.24%, Nb0.02 ⁇ 0.06%, Ni0.02-0.10%, N200 ⁇ 300ppm; optional components: Ti0.001 ⁇ 0.020%, Mo0.01 ⁇ 0.05%, Cu0.02 ⁇ 0.10% One or a combination of two or more; the rest is Fe and unavoidable impurities.
  • the threaded steel bar adopts converter or electric furnace smelting, LF furnace refining, billet continuous casting and rolling, and cooling bed cooling process.
  • the lower yield strength of the threaded steel bar produced by the above-mentioned composition and method is more than 700MPa, the elongation after fracture is more than 14%, and the microstructure is ferrite and pearlite.
  • Chinese patent CN100513614C discloses a high-strength threaded steel bar and its preparation process. Its composition is: C: 0.12 ⁇ 0.25%, Si: 0.12 ⁇ 0.80%, Mn: 0.30 ⁇ 1.55%, P: 0.01 ⁇ 0.035%, S: 0.01 ⁇ 0.040%, carbon equivalent: 0.19 ⁇ 0.51%, the balance is Fe.
  • the technological process is: billet ⁇ heating ⁇ rough and intermediate rolling ⁇ finishing rolling ⁇ QTB water penetration ⁇ upper cooling bed (natural cooling) ⁇ fixed length ⁇ inspection ⁇ storage.
  • the advantage is that different chemical compositions are designed according to different specifications of the threaded steel bars, and the post-rolling heat treatment process is adopted to make the steel bars maintain good plasticity and toughness at the same time.
  • the present invention has been completed in consideration of at least one of the aforementioned problems.
  • it is common to reduce the outer diameter of solid threaded steel bars.
  • the facts show that this will lead to a sharp decrease in the strength of solid threaded steel bars, and will not significantly reduce the amount of steel.
  • the applicant found through experiments and related research that, compared with solid threaded steel bars, by relatively increasing the outer diameter of the threaded steel bars and adopting a hollow structure to form a hollow threaded steel bar, combined with high-strength stainless steel materials, it can achieve the same or At the same time of greater strength, it saves about 2/3 to 3/4 of the steel consumption.
  • a hollow threaded steel bar which is characterized in that the outer diameter of the hollow threaded steel bar is ⁇ and the thickness is 0.8-2mm, and the outer diameter of the conventional solid threaded steel bar is D, ⁇ /D Is between 1.07-1.25, the thickness of the hollow threaded steel bar increases as the outer diameter ⁇ increases; the hollow threaded steel bar has a strength greater than or equal to the strength of the solid threaded steel bar, and the weight is 1 of that of the solid threaded steel bar. /3-1/4;
  • the chemical composition and mass fraction of the hollow threaded steel bars are: Cr content 10.5-15%, Ni content 0.8-5%, P content 0.03-0.15%, C content less than 0.15%, S content less than 0.03%, and O content less than 50ppm, Mn content is less than 1%, Si content is less than 1%, and the balance is Fe.
  • the range of ⁇ is 13-45mm.
  • ⁇ corresponds to 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45mm
  • the thickness corresponds to 0.8, 1.0, 1.0, 1.2, 1.2, 1.4, 1.4, 1.6, 1.6, 1.8, 1.8, 2.0, 2.0, 2.2, 2.2mm.
  • a concrete structure which is characterized by comprising concrete and the aforementioned hollow threaded steel bars arranged at intervals in the concrete.
  • a construction method of a concrete structure which is characterized in that it comprises the following steps:
  • the chemical composition and mass fraction of the hollow threaded steel bars are: Cr content 10.5-15%, Ni content 0.8-5%, P The content is 0.03-0.15%, the C content is less than 0.15%, the S content is less than 0.03%, the O content is less than 50ppm, the Mn content is less than 1%, the Si content is less than 1%, and the balance is Fe;
  • the thickness of the hollow threaded steel bar is set to 0.8-2mm, and increases as the outer diameter ⁇ increases.
  • the hollow threaded steel bar has a strength greater than or equal to the strength of the solid threaded steel bar and the weight is 1/3 of the solid threaded steel bar -1/4;
  • the hollow threaded steel bars are arranged in concrete at intervals to form the concrete structure.
  • the present invention has the following beneficial effects:
  • the hollow rebar of the present invention saves about 2/3 to 3/4 of the amount of steel used, and achieves the same or greater strength and energy saving and emission reduction;
  • the hollow threaded steel bar of the present invention greatly reduces the cost of the concrete structure, thereby reducing the production cost of the building.
  • Fig. 1 is a schematic structural diagram of a hollow threaded steel bar according to a preferred embodiment of the present invention.
  • Fig. 2 is a structural cross-sectional view of a hollow threaded steel bar according to a preferred embodiment of the present invention.
  • the present invention provides a hollow threaded steel bar.
  • the hollow threaded steel bar is, for example, of a prestressed or non-prestressed type.
  • the outer diameter of the hollow threaded steel bar is ⁇
  • the thickness is 0.8-2mm
  • the outer diameter of the conventional solid threaded steel bar is D
  • the range of ⁇ /D is between 1.07-1.25.
  • the thickness of the hollow threaded steel bar increases with the outer diameter ⁇
  • the hollow threaded steel bar has a strength greater than or equal to the strength of the solid threaded steel bar, and the weight is 1/3-1/4 of the solid threaded steel bar.
  • the outer diameter ⁇ of the hollow threaded steel bar in the present invention refers to the maximum outer diameter
  • the thickness of the hollow threaded steel bar refers to the minimum or maximum wall thickness of the threaded steel bar.
  • the thickness of the hollow threaded steel bar is the minimum wall thickness.
  • the chemical composition and mass fraction of the hollow threaded steel bar are: Cr content 10.5-15%, Ni content 0.8-5%, P content 0.03-0.15%, C content less than 0.15%,
  • the S content is less than 0.03%, the O content is less than 50 ppm, the Mn content is less than 1%, the Si content is less than 1%, and the balance is Fe.
  • the range of ⁇ is 13-45 mm.
  • ⁇ corresponds to 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45mm
  • the thickness corresponds to 0.8, 1.0, 1.0, 1.2, 1.2, 1.4, 1.4, 1.6, 1.6, 1.8, 1.8, 2.0, 2.0, 2.2, 2.2mm.
  • a concrete structure which is characterized by comprising concrete and the aforementioned hollow threaded steel bars arranged at intervals in the concrete.
  • a construction method of a concrete structure which is characterized in that it comprises the following steps:
  • the chemical composition and mass fraction of the hollow threaded steel bars are: Cr content 10.5-15%, Ni content 0.8-5%, P The content is 0.03-0.15%, the C content is less than 0.15%, the S content is less than 0.03%, the O content is less than 50ppm, the Mn content is less than 1%, the Si content is less than 1%, and the balance is Fe;
  • the thickness of the hollow threaded steel bar is set to 0.8-2mm, and increases as the outer diameter ⁇ increases.
  • the hollow threaded steel bar has a strength greater than or equal to the strength of the solid threaded steel bar and the weight is 1/3 of the solid threaded steel bar. -1/4;
  • the hollow threaded steel bars are arranged in concrete at intervals to form the concrete structure.
  • the present invention provides a hollow threaded steel bar.
  • the outer diameter of the hollow threaded steel bar is ⁇
  • the thickness is 0.8-2mm
  • the outer diameter of the conventional solid threaded steel bar is D
  • the range of ⁇ /D is between 1.07-1.25.
  • the thickness of the hollow threaded steel bar increases with the outer diameter ⁇
  • the hollow threaded steel bar has a strength greater than or equal to the strength of the solid threaded steel bar, and the weight is 1/3-1/4 of the solid threaded steel bar.
  • the chemical composition and mass fraction of the hollow threaded steel bars are: Cr content 13%, Ni content 3.5%, P content 0.035%, C content less than 0.06%, S content less than 0.025%, O content less than 25ppm, and Mn content less than 1. %, the Si content is less than 1%, and the balance is Fe.
  • the range of ⁇ is 13-45 mm.
  • a concrete structure which is characterized by comprising concrete and the aforementioned hollow threaded steel bars arranged at intervals in the concrete.
  • a construction method of a concrete structure which is characterized in that it comprises the following steps:
  • the outer diameter ⁇ of the hollow threaded steel bar is determined.
  • the chemical composition and mass fraction of the hollow threaded steel bar are: Cr content 13%, Ni content 4%, P content 0.06%, C content is less than 0.15%, S content is less than 0.03%, O content is less than 50ppm, Mn content is less than 1%, Si content is less than 1%, and the balance is Fe;
  • the thickness of the hollow threaded steel bar is set to 0.8-2mm, and increases as the outer diameter ⁇ increases.
  • the hollow threaded steel bar has a strength greater than or equal to the strength of the solid threaded steel bar and the weight is 1/3 of the solid threaded steel bar. -1/4;
  • the hollow threaded steel bars are arranged in concrete at intervals to form the concrete structure.
  • the two ends are fixed, the counterweight is hoisted in the middle, and the counterweight is gradually increased to measure the deflection.
  • Deflection test result of 20CrNi threaded steel bar The deflection test result of specification ⁇ 14 under the condition of 23.46Kg counterweight, the average value of the two deflection (12.25mm, 13mm) is: 12.625mm.
  • the rigidity of the stainless steel hollow threaded steel bar ⁇ 17 ⁇ 0.8mm of the present invention is higher than that of the 20CrNi threaded steel bar specification ⁇ 14.
  • the hollow threaded steel bar of the present invention saves about 2/3 to 3/4 of the amount of steel used to achieve the same or greater strength;
  • the hollow threaded steel bar of the present invention greatly reduces the cost of the concrete structure, thereby reducing the production cost of the building.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

一种中空螺纹钢筋，其外直径为Φ，厚度为0.8-2mm，设常规实体螺纹钢筋的外直径为D，Φ/D的范围在1.07-1.25之间，中空螺纹钢筋的厚度随着外直径Φ增大而增大；该中空螺纹钢筋具有大于等于实体螺纹钢筋强度的强度且重量为实体螺纹钢筋的1/3-1/4。该中空螺纹钢筋节省钢材用量，降低了混凝土结构成本。

Description

中空螺纹钢筋及使用中空螺纹钢筋的混凝土结构 技术领域
本发明属于建筑施工用混凝土结构以及螺纹钢筋的技术领域，更具体地，涉及一种中空螺纹钢筋及使用中空螺纹钢筋的混凝土结构。
背景技术
目前，混凝土用螺纹钢筋(也称精轧螺纹钢筋，以下均简称精轧螺纹钢筋)是在整根钢筋上轧有外螺纹的大直径、高强度、高尺寸精度的直条钢筋。该钢筋在任意截面处都拧上带有内螺纹的连接器进行连接或拧上带螺纹的螺帽进行锚固。精轧螺纹钢筋广泛应用于大型水利工程、工业和民用建筑中的连续梁和大型框架结构，公路、铁路大中跨桥梁、核电站及地锚等工程。它具有连接、锚固简便，粘着力强，张拉锚固安全可靠，施工方便等优点，而且节约钢筋，减少构件面积和重量。
例如，中国专利CN103898408B公开了一种700MPa级螺纹钢筋及其生产方法，该螺纹钢筋包含如下基本成分：C0.28～0.32％，Si0.40～0.80％，Mn1.20～1.60％，V0.18～0.24％，Nb0.02～0.06％，Ni0.02-0.10％，N200～300ppm；可选成分：Ti0.001～0.020％,Mo0.01～0.05％，Cu0.02～0.10％中的任意一种或两种以上的组合；其余为Fe和不可避免的杂质。该螺纹钢筋采用转炉或电炉冶炼，LF炉精炼，小方坯连铸连轧，冷床冷却的工艺。采用上述成分和方法生产的螺纹钢筋下屈服强度＞700MPa，断后伸长率＞14％，显微组织为铁素体和珠光体。
例如，中国专利CN100513614C公开了一种高强度螺纹钢筋及其制备工艺，其成分为：C：0.12～0.25％，Si：0.12～0.80％，Mn：0.30～1.55％，P：0.01～0.035％，S：0.01～0.040％，碳当量：0.19～0.51％，余量为Fe。其工艺流程为：方坯→加热→粗、中轧→精轧→QTB穿水→上冷床(自然冷却)→定尺→检验→入库。其优点在于：据螺纹钢筋规格不同设计不同的化学成分，采用轧后余热处理工艺使钢筋同时保持良好的塑、韧性。
但是，众所周知，包括上述专利和GB/T20065-2006《混凝土用螺纹钢筋》等在内的现有技术中，螺纹钢筋都是实体结构，其形成了行业内的技术基础(或偏见)，这使得长久以来，螺纹钢筋并没有结构上的变化或改进，因此，在满足强度要求的前提下，往往需要消耗大量的钢材，这无疑大大增加了建筑成本。
因此，为了解决上述现有技术的诸多不足和缺陷，有必要研究一种满足强度要求的、节省钢材消耗量的螺纹钢筋以及使用这种螺纹钢筋的混凝土结构。
发明内容
考虑到至少一个上述问题而完成了本发明。在混凝土结构施工中，常见减小实体螺纹钢筋外直径的报道，事实表明，这会导致实体螺纹钢筋强度的急剧减小，且并不会大幅减少钢材用量。申请人通过实验和相关研究发现，相比于实体螺纹钢筋而言，通过相对地增大螺纹钢筋的外直径，并采用中空结构，形成中空螺纹钢筋，结合高强度不锈钢材料，能够在实现相同或更大强度的同时，节省约2/3至3/4的钢材用量。具体地，根据本发明一方面，提供了一种中空螺纹钢筋，其特征在于该中空螺纹钢筋的外直径为Φ，厚度为0.8-2mm，设常规实体螺纹钢筋的外直径为D，Φ/D的范围在1.07-1.25之间，中空螺纹钢筋的厚度随着外直径Φ增大而增大；该中空螺纹钢筋具有大于等于所述实体螺纹钢筋强度的强度且重量为所述实体螺纹钢筋的1/3-1/4；
其中所述中空螺纹钢筋的化学成份及质量分数为：Cr含量10.5-15％，Ni含量0.8-5％，P含量0.03-0.15％，C含量小于0.15％，S含量小于0.03％，O含量小于50ppm，Mn含量小于1％，Si含量小于1％，余量为Fe。
根据本发明另一方面，Φ的范围为13-45mm。
根据本发明另一方面，D为12mm时Φ为15mm，厚度为0.8mm。
根据本发明另一方面，D为14、16、18、20、22、24、26、28、30、32、34、36、38、40、42mm时，Φ分别对应为17、19、21、23、25、27、29、31、33、35、37、39、41、43、45mm，厚度分别对应为0.8、1.0、1.0、1.2、1.2、1.4、1.4、1.6、1.6、1.8、1.8、2.0、2.0、2.2、2.2mm。
根据本发明另一方面，提供了一种混凝土结构，其特征在于包括混凝土和间隔设置在混凝土中的前述中空螺纹钢筋。
根据本发明另一方面，提供了一种混凝土结构的施工方法，其特征在于包括以下步骤：
根据混凝土结构的强度要求确定常规实体螺纹钢筋的外直径D；
根据Φ/D的范围在1.07-1.25之间确定中空螺纹钢筋的外直径Φ，其中所述中空螺纹钢筋的化学成份及质量分数为：Cr含量10.5-15％，Ni含量0.8-5％，P含量0.03-0.15％，C含量小于0.15％，S含量小于0.03％，O含量小于50ppm，Mn含量小于1％，Si含量小于1％，余量为Fe；
中空螺纹钢筋的厚度设置为0.8-2mm，且随着外直径Φ增大而增大，该中空螺纹钢筋具有大于等于所述实体螺纹钢筋强度的强度且重量为所述实体螺纹钢筋的1/3-1/4；
将所述的中空螺纹钢筋间隔设置在混凝土中形成所述混凝土结构。
与现有技术相比，本发明的有益效果在于：
1.本发明的中空螺纹钢筋节省约2/3至3/4的钢材用量,实现了相同或更大强度以及节能减排；
2.本发明的中空螺纹钢筋大大降低了混凝土结构成本，因而降低了建筑的生产成本。
附图说明
图1是根据本发明一种优选实施例的中空螺纹钢筋的结构示意图。
图2是根据本发明一种优选实施例的中空螺纹钢筋的结构断面图。
具体实施方式
下面结合附图，通过优选实施例来描述本发明的最佳实施方式，这里的具体实施方式在于详细地说明本发明，而不应理解为对本发明的限制，在不脱离本发明的精神和实质范围的情况下，可以做出各种变形和修改，这些都应包含在本发明的保护范围之内。
实施例1
申请人通过实验和相关研究发现，相比于实体螺纹钢筋而言，通过相对地增大螺纹钢筋的外直径，并采用中空结构，形成中空螺纹钢筋，能够在实现相同或更大强度的同时，节省约2/3至3/4的钢材用量。参见图1-2，本发明提供了一种中空螺纹钢筋。该中空螺纹钢筋例如为预应力或非预应力类型。该中空螺纹钢筋的外直径为Φ，厚度为0.8-2mm，设常规实体螺纹钢筋的外直径为D，Φ/D的范围在1.07-1.25之间，中空螺纹钢筋的厚度随着外直径Φ增大而增大；该中空螺纹钢筋具有大于等于所述实体螺纹钢筋强度的强度且重量为所述实体螺纹钢筋的1/3-1/4。
需要说明的是，本发明的中空螺纹钢筋的外直径Φ是指最大外直径，中空螺纹钢筋的厚度是指螺纹钢筋的最小或最大壁厚。优选地，中空螺纹钢筋的厚度为最小壁厚。
根据本发明另一优选实施方式，其中所述中空螺纹钢筋的化学成份及质量分数为：Cr含量10.5-15％，Ni含量0.8-5％，P含量0.03-0.15％，C含量小于0.15％，S含量小于0.03％，O含量小于50ppm，Mn含量小于1％，Si含量小于1％，余量为Fe。
根据本发明另一优选实施方式，Φ的范围为13-45mm。
根据本发明另一优选实施方式，D为12mm时Φ为15mm，厚度为0.8mm。
根据本发明另一优选实施方式，D为14、16、18、20、22、24、26、28、30、32、34、36、38、40、42mm时，Φ分别对应为17、19、21、23、25、27、29、31、33、35、37、39、41、43、45mm，厚度分别对应为0.8、1.0、1.0、1.2、1.2、1.4、1.4、1.6、1.6、1.8、1.8、2.0、2.0、2.2、2.2mm。
根据本发明另一优选实施方式，提供了一种混凝土结构，其特征在于包括混凝土和间隔设置在混凝土中的前述中空螺纹钢筋。
根据本发明另一优选实施方式，提供了一种混凝土结构的施工方法，其特征在于包括以下步骤：
根据混凝土结构的强度要求确定常规实体螺纹钢筋的外直径D；
根据Φ/D的范围在1.07-1.25之间确定中空螺纹钢筋的外直径Φ，其中所述中空螺纹钢筋的化学成份及质量分数为：Cr含量10.5-15％，Ni含量0.8-5％，P含量0.03-0.15％，C含量小于0.15％，S含量小于0.03％，O含量小于50ppm，Mn含量小于1％，Si含量小于1％，余量为Fe；
中空螺纹钢筋的厚度设置为0.8-2mm，且随着外直径Φ增大而增大，该中空螺纹钢筋具有大于等于所述实体螺纹钢筋强度的强度且重量为所述实体螺纹钢筋的1/3-1/4；
将所述的中空螺纹钢筋间隔设置在混凝土中形成所述混凝土结构。
实施例2
参见图1-2，本发明提供了一种中空螺纹钢筋。该中空螺纹钢筋的外直径为Φ，厚度为0.8-2mm，设常规实体螺纹钢筋的外直径为D，Φ/D的范围在1.07-1.25之间，中空螺纹钢筋的厚度随着外直径Φ增大而增大；该中空螺纹钢筋具有大于等于所述实体螺纹钢筋强度的强度且重量为所述实体螺纹钢筋的1/3-1/4。其中所述中空螺纹钢筋的化学成份及质量分数为：Cr含量13％，Ni含量3.5％，P含量0.035％，C含量小于0.06％，S含量小于0.025％，O含量小于25ppm，Mn含量小于1％，Si含量小于1％，余量为Fe。
根据本发明另一优选实施方式，Φ的范围为13-45mm。
根据本发明另一优选实施方式，D为12mm时Φ为15mm，厚度为0.8mm。
根据本发明另一优选实施方式，提供了一种混凝土结构，其特征在于包括混凝土和间隔设置在混凝土中的前述中空螺纹钢筋。
根据本发明另一优选实施方式，提供了一种混凝土结构的施工方法，其特征在于包括以下步骤：
根据混凝土结构的强度要求确定常规实体螺纹钢筋的外直径D；
根据Φ/D的范围在1.07-1.25之间确定中空螺纹钢筋的外直径Φ，其中所述中空螺纹钢筋的化学成份及质量分数为：Cr含量13％，Ni含量4％，P含量0.06％，C含量小于0.15％，S含量小于0.03％，O含量小于50ppm，Mn含量小于1％，Si含量小于1％，余量为Fe；
中空螺纹钢筋的厚度设置为0.8-2mm，且随着外直径Φ增大而增大，该中空螺纹钢筋具有大于等于所述实体螺纹钢筋强度的强度且重量为所述实体螺纹钢筋的1/3-1/4；
将所述的中空螺纹钢筋间隔设置在混凝土中形成所述混凝土结构。
强度实验
采用两端固定，中间吊放配重，逐渐增加配重测量挠度。
采用根据本发明材料的中空螺纹钢筋1.5m每支，然后两端固定后，试验段长度为1.2m，在0.6m处吊一支空桶，事先测量原始高度，之后逐渐增加配重1-7块铁块并记录下挠度数据。
Figure PCTCN2020088962-appb-000001
Figure PCTCN2020088962-appb-000002
试验结论
从上表结果可以看出，本发明不锈钢中空螺纹钢筋规格Φ17×0.8mm挠度测试结果在配重23.46Kg条件下，两支挠度(12.7mm、10.2mm)平均值为：11.45mm。
20CrNi螺纹钢筋挠度测试结果：规格Φ14挠度测试结果在配重23.46Kg条件下，两支挠度(12.25mm、13mm)平均值为：12.625mm。
因此可以看出：本发明不锈钢中空螺纹钢筋Φ17×0.8mm刚度比20CrNi螺纹钢筋规格Φ14刚度高。
综上所述，本发明的有益效果在于以下的一个或多个：
1.本发明的中空螺纹钢筋节省约2/3至3/4的钢材用量,实现了实现相同或更大强度；
2.本发明的中空螺纹钢筋大大降低了混凝土结构成本，因而降低了建筑的生产成本。
本发明不限于上述具体实施例。可以理解的是，在不脱离本发明的精神和实质范围的情况下，可以做出各种变形和修改，这些都应包含在本发明的保护范围之内。

Claims (6)

  1. 一种中空螺纹钢筋，其特征在于该中空螺纹钢筋的外直径为Φ，厚度为0.8-2mm，设常规实体螺纹钢筋的外直径为D，Φ/D的范围在1.07-1.25之间，中空螺纹钢筋的厚度随着外直径Φ增大而增大；该中空螺纹钢筋具有大于等于所述实体螺纹钢筋强度的强度且重量为所述实体螺纹钢筋的1/3-1/4；
    其中所述中空螺纹钢筋的化学成份及质量分数为：Cr含量10.5-15％，Ni含量0.8-5％，P含量0.03-0.15％，C含量小于0.15％，S含量小于0.03％，O含量小于50ppm，Mn含量小于1％，Si含量小于1％，余量为Fe。
  2. 根据权利要求1中所述的中空螺纹钢筋，其特征在于Φ的范围为13-45mm。
  3. 根据权利要求2中所述的中空螺纹钢筋，其特征在于D为12mm时Φ为15mm，厚度为0.8mm。
  4. 根据权利要求2中所述的中空螺纹钢筋，其特征在于D为14、16、18、20、22、24、26、28、30、32、34、36、38、40、42mm时，Φ分别对应为17、19、21、23、25、27、29、31、33、35、37、39、41、43、45mm，厚度分别对应为0.8、1.0、1.0、1.2、1.2、1.4、1.4、1.6、1.6、1.8、1.8、2.0、2.0、2.2、2.2mm。
  5. 一种混凝土结构，其特征在于包括混凝土和间隔设置在混凝土中的如权利要求1-4任一项所述的中空螺纹钢筋。
  6. 一种中空螺纹钢筋，其特征在于该中空螺纹钢筋的外直径为Φ，厚度为0.8-2mm，设常规实体螺纹钢筋的外直径为D，Φ/D的范围在1.07-1.25之间，中空螺纹钢筋的厚度随着外直径Φ增大而增大；该中空螺纹钢筋具有大于等于所述实体螺纹钢筋强度的强度且重量为所述实体螺纹钢筋的1/3-1/4。
PCT/CN2020/088962 2019-12-10 2020-05-07 中空螺纹钢筋及使用中空螺纹钢筋的混凝土结构 WO2021114558A1 (zh)

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