WO2021003859A1 - 一种扣件式frp螺旋箍筋增强方形frp管全珊瑚骨料海水混凝土柱 - Google Patents

一种扣件式frp螺旋箍筋增强方形frp管全珊瑚骨料海水混凝土柱 Download PDF

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WO2021003859A1
WO2021003859A1 PCT/CN2019/109873 CN2019109873W WO2021003859A1 WO 2021003859 A1 WO2021003859 A1 WO 2021003859A1 CN 2019109873 W CN2019109873 W CN 2019109873W WO 2021003859 A1 WO2021003859 A1 WO 2021003859A1
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frp
coral
pipe
square
spiral
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PCT/CN2019/109873
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English (en)
French (fr)
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尹世平
胡长顺
李耀
华云涛
王聪聪
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中国矿业大学
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Publication of WO2021003859A1 publication Critical patent/WO2021003859A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/24—Sea water resistance

Definitions

  • the invention relates to a fastener type FRP spiral stirrup reinforced square FRP pipe all-coral aggregate seawater concrete column, which belongs to the technical field of marine island and reef engineering construction.
  • the present invention connects the square FRP pipe and the spiral stirrup through metal fasteners, and pours full coral aggregate seawater in the pipe. Concrete.
  • Square FRP pipes and FRP spiral stirrups can double confine the core concrete, and its strength and ductility are greatly improved. This component combines the advantages of a square column and a round column.
  • the present invention provides a fastener-type FRP spiral stirrup reinforced square FRP pipe all-coral aggregate seawater concrete column, which has a simple structure, high bearing capacity, good durability, and complete The life cycle cost is low and other features can be obtained locally, saving resources, saving costs, convenient construction, and ensuring the construction period.
  • a fastener type FRP spiral stirrup reinforced square FRP tube all-coral aggregate seawater concrete column including a formed FRP rounded square tube, FRP spiral stirrup, metal fasteners and all-coral aggregate seawater concrete;
  • the FRP spiral stirrups are arranged in the formed FRP rounded square pipe with the same central axis, and the FRP spiral stirrups and the formed FRP rounded square pipe are combined by a metal fastener arranged on the center line of the inner wall of the formed FRP rounded square pipe.
  • Fixed and full coral aggregate seawater concrete is poured into the formed FRP rounded square tube.
  • the formed FRP square tube is located on the outermost side of the column, is corrosion resistant, prevents chloride ions from penetrating into the concrete column, and has a restraining effect on the core concrete.
  • it can be used as a template for concrete pouring during concrete construction; spiral FRP hoop
  • the ribs are tied and fixed with longitudinal FRP ribs evenly distributed along the circumference.
  • the binding method can be wire tie or plastic bandage. At least four longitudinal FRP ribs.
  • the outermost diameter of the spiral stirrup is smaller than the inner side of the FRP square tube by 40-60mm, which is convenient for screwing.
  • the stirrup cage is placed in the FRP pipe, and at the same time, it is convenient to control the thickness of the protective layer of the stirrup through the metal fastener; the tied spiral stirrup cage is placed in the FRP pipe and connected by the metal fastener to form a whole for easy control during pouring The position of the stirrup cage and the thickness of the protective layer; the full coral aggregate seawater concrete is poured into the square FRP pipe to form an FRP spiral stirrup reinforced square FRP pipe full coral aggregate seawater concrete column.
  • the shaped FRP rounded square tube adopts shaped rounded square glass fiber tube (GFRP), basalt fiber tube (BFRP), carbon fiber tube (CFRP) or aramid fiber tube (AFRP), etc., and the tube wall thickness is 3 mm. -6mm, the rounded FRP tube is used to prevent the FRP tube from breaking at the corner of the column prematurely when the component is compressed.
  • GFRP shaped rounded square glass fiber tube
  • BFRP basalt fiber tube
  • CFRP carbon fiber tube
  • AFRP aramid fiber tube
  • the FRP spiral stirrups and the longitudinal FRP ribs use one or more of BFRP, GFRP, CFRP or AFRP, wherein the diameter of the reinforcement and the spacing of the stirrups are selected according to the size of the component and the design bearing capacity.
  • the metal fastener is a metal fastener made of anti-rust material (stainless steel material is preferably used, or anti-rust paint is sprayed on the surface to prevent the fastener from rusting), and includes a suitable T-shaped base and U-shaped buckle.
  • the type base is glued on the inner wall of the formed FRP rounded square tube with epoxy resin, and the U-shaped buckle passes through the spiral stirrup to connect with the T-shaped base.
  • Metal fasteners are used to connect the spiral stirrup and the square FRP pipe to make it a whole, which is convenient to control the position of the stirrup cage in the FRP pipe and the thickness of the protective layer, and prevent the position of the stirrup cage from moving during concrete pouring, which may cause the stirrup cage to tilt early , Affect the restraint effect and the ultimate bearing capacity of the column.
  • the full coral aggregate seawater concrete is made of cement, coral aggregate, coral sand, sea water and water reducing agent in a certain proportion, and the strength grade is not lower than C40;
  • the bulk density of the coral aggregate is 900 ⁇ 1100kg/m 3
  • the apparent density is 1800 ⁇ 2300kg/m 3
  • the cylinder compressive strength is generally not less than 2.5MPa
  • the chloride ion content is 0.006% ⁇ 0.074%
  • the porosity is 50%.
  • the coral sand is calcareous sand with a calcium content of more than 90%, most of the particle size is between 0.8-1.2mm, the bulk density is generally 1.31g/m 3 , the specific gravity is 2.80, and the porosity is about 53%.
  • the distribution ratio of each group in the full coral aggregate seawater concrete is: cement 540kg/m 3 , coral coarse aggregate 560kg/m 3 , coral sand 710kg/m 3 , seawater consumption 220kg/m 3 , Sika third generation reduction
  • the water agent is 7.5kg/m 3
  • the cement uses 42.5 sulfate-resistant cement or 42.5 ordinary silicate.
  • the mixing method of the whole coral aggregate seawater concrete is as follows: 1) First, use a crusher to crush the dried coral stone into 5-20mm particle size. It is required to have a good gradation and control the content of needle-like coral. Pass through a 5mm square hole sieve to sift out more than powder produced by crushing; 2) Put the coral sand and crushed coral coarse aggregate into a mixer for 30 seconds, then add 1/2 total sea water while stirring for 1 min; 3) Pour the cement into the mixer and mix for 30 seconds, and mix the water reducing agent and the remaining mixing water into the mixer and continue mixing for 2 minutes.
  • the fastener-type FRP spiral stirrup reinforced square FRP pipe all-coral aggregate seawater concrete column provided by the present invention has the following advantages compared with the prior art:
  • the processing is simple, the construction is convenient, the cross-sectional area of the column is reduced under the same bearing capacity, the bearing capacity is high, the ductility and durability are good, and the life cycle cost is low.
  • Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the structure of the FRP rounded square tube formed in the embodiment of the present invention.
  • Figure 3 is a schematic diagram of the structure of FRP spiral stirrups in an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of the structure of a metal fastener in an embodiment of the present invention.
  • Figure 5 is a schematic cross-sectional view of a concrete column in an embodiment of the present invention.
  • the picture includes: 1. Formed FRP rounded square pipe, 2. Full coral aggregate seawater concrete, 3. Longitudinal FRP reinforcement, 4. FRP spiral stirrup, 5. T-shaped base, 6. U-shaped buckle.
  • a fastener type FRP spiral stirrup reinforced square FRP pipe full coral aggregate seawater concrete column including formed FRP rounded square pipe 1, FRP spiral stirrup 4, metal fasteners and full coral Aggregate seawater concrete 2;
  • the FRP spiral stirrups 4 are arranged in the formed FRP rounded square tube 1 with the same central axis, and the FRP spiral stirrups 4 and the formed FRP are realized by the metal fasteners arranged on the center line of the inner wall of the formed FRP rounded square tube 1
  • the rounded square tube 1 is fixed, and the full coral aggregate seawater concrete 2 is poured into the formed FRP rounded square tube 1 to form a concrete column section as shown in FIG. 5.
  • the FRP spiral stirrup 4 is fastened with at least four longitudinal FRP ribs 3 uniformly distributed along the circumference, and the outer diameter of the FRP spiral stirrup 4 is smaller than the inner side length of the FRP rounded square tube 1 by 40 -60mm.
  • the shaped FRP rounded square tube 1 can be shaped rounded square glass fiber tube GFRP, basalt fiber tube BFRP, carbon fiber tube CFRP or aramid fiber tube AFRP, etc., and the tube wall thickness is 3 mm-6 mm.
  • the FRP spiral stirrup 4 and the longitudinal FRP rib 3 may use one or more of BFRP, GFRP, CFRP or AFRP.
  • the metal fastener is made of anti-rust material (using stainless steel, or sprayed with anti-rust paint on the surface to prevent the fastener from rusting), which includes a suitable T-shaped base 5 and a U-shaped The buckle 6, wherein the T-shaped base 5 is glued on the inner wall of the formed FRP rounded square tube 1 with epoxy resin, and the U-shaped buckle 6 is connected to the T-shaped base 5 through the spiral stirrup.
  • anti-rust material using stainless steel, or sprayed with anti-rust paint on the surface to prevent the fastener from rusting
  • Said all-coral aggregate seawater concrete 2 is made of cement, coral aggregate, coral sand, sea water and water reducing agent in a certain proportion, and the strength grade is not lower than C40;
  • the bulk density of the coral aggregate is 900 ⁇ 1100kg/m 3
  • the apparent density is 1800 ⁇ 2300kg/m 3
  • the cylinder compressive strength is generally not less than 2.5MPa
  • the chloride ion content is 0.006% ⁇ 0.074%
  • the porosity is 50%.
  • the coral sand is calcareous sand with a calcium content of more than 90%, most of the particle size is between 0.8-1.2mm, the bulk density is generally 1.31g/m 3 , the specific gravity is 2.80, and the porosity is about 53%.
  • the distribution ratio of each group in the full coral aggregate seawater concrete 2 is: cement 540kg/m 3 , coral coarse aggregate 560kg/m 3 , coral sand 710kg/m 3 , seawater consumption 220kg/m 3 , Sika third generation water reducing agent 7.5kg/m 3 , and 42.5 sulfate-resistant cement or 42.5 ordinary silicate is used as the cement;
  • the mixing method is: 1) First, use a crusher to crush the dry coral stone into a particle size of 5-20mm, requiring good gradation And control the content of needle-flaky coral, after crushing, go through a 5mm square hole sieve to screen out more than powder produced by crushing; 2) Put the coral sand and crushed coral coarse aggregate into a mixer for 30 seconds, then add 1 while stirring /2 total sea water consumption and stir for 1 min; 3) Pour the cement into the mixer and stir for 30 seconds, and mix the water reducing agent and the remaining mixing water into the mixer and continue mixing for 2 minutes.
  • the preparation method of the whole coral aggregate seawater concrete column of the present invention includes the following steps:
  • the elastic metal fasteners 5 and 6 should be made of stainless steel, or spray anti-rust paint on the surface to prevent the fasteners from rusting.
  • C. Mixing seawater concrete with full coral aggregate 2 First, use a crusher to crush the dry coral stone into a particle size of 5-20mm. It is required to have a good gradation and control the content of needle-shaped coral. After crushing, pass a 5mm square hole sieve and sieve In addition to crushing, more than powder is produced; put the coral sand and the crushed coral coarse aggregate into a mixer and mix for 30 seconds, then add 1/2 total sea water while stirring for 1 minute; pour the cement into the mixer and mix for 30 seconds, and reduce Mix the water agent with the remaining mixing water, pour into the mixer and continue mixing for 2 minutes.
  • Cement preferably 42.5 sulfate-resistant cement or 42.5 ordinary Portland cement 540kg/m3, coral coarse aggregate 560kg/m3, coral sand 710kg/m3, water consumption 220kg/ m3, Sika third generation water reducing agent 7.5kg/m3.
  • the square FRP pipe, spiral FRP stirrups, FRP straight bars, and metal fasteners all have excellent corrosion resistance, which provides a prerequisite for the direct use of full coral aggregate seawater concrete in a marine environment.
  • FRP material has excellent tensile properties.
  • the dual restraint of FRP pipe and FRP spiral stirrups on the core concrete greatly improves the load-bearing capacity of the concrete column, and makes up for the current low strength of coral concrete, which is difficult to be applied to the main stressed components of the project. On the defect.
  • the island and reef project local materials are used, and the common coral reef sand and seawater are used, which saves costs, shortens the construction period, and greatly promotes the construction of marine island and reef projects.

Abstract

一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，包括成型FRP圆角方管(1)、FRP螺旋箍筋(4)、金属扣件和全珊瑚骨料海水混凝土(2)；其中，FRP螺旋箍筋(4)与成型FRP圆角方管(1)同心布置，金属扣件用来固定FRP螺旋箍筋(4)与成型FRP圆角方管(1)，并控制混凝土保护层厚度，最后在成型FRP圆角方管(1)中浇筑全珊瑚骨料海水混凝土(2)。外包成型FRP圆角方管(1)与FRP螺旋箍筋(4)共同约束内部全珊瑚骨料海水混凝土(2)，大幅提高柱承载能力及构件可靠度，有效防止海水侵蚀，充分利用珊瑚礁砂，保证施工工期。

Description

一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱 技术领域
本发明涉及一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，属于海洋岛礁工程建设技术领域。
背景技术
随着土地资源变得越来越紧缺，人们对远海岛礁的开发势在必行，然而大多数岛礁远离大陆，物资淡水资源匮乏，若使用传统建筑材料进行岛礁工程建设，必须用船舶从大陆运输大量的沙石和淡水，这样会面临着巨大的运输成本，并且可能由于风浪影响，难以保证工期。所以在不破坏珊瑚岛礁当地生态环境的前提下，在岛礁上就地取材，采用修建码头、疏通航道、以及海浪冲刷堆积出来的珊瑚礁砂，代替沙石资源，配制珊瑚礁砂混凝土对于岛礁工程建设具有很高的现实意义和实用价值。
国内外关于FRP管约束混凝土组合柱的研究，大多数集中于圆形截面组合柱，因为圆形FRP管对核心混凝土的约束效果优于方形FRP管，使得其承载力更高。但是方形截面柱因其空间布置、施工、节点连接方便等优点，有着同样广泛的应用范围，本发明将方形FRP管和螺旋箍筋通过金属扣件连接，并在管中浇筑全珊瑚骨料海水混凝土。方形FRP管和FRP螺旋箍筋可以对核心混凝土起双重约束作用，其强度和延性得到大幅提高。该构件结合了方形柱和圆形柱的优点，方形FRP管和螺旋箍筋双重约束使核心混凝土处于三向受压状态，弥补了全珊瑚骨料海水混凝土强度不高的缺点，使得构件可靠度大大提升。同时由于FRP材料优良的耐久性能，避免了因钢筋锈蚀导致的构件承载能力的降低，及后期高昂的维护成本，可以广泛应用于海洋岛礁工程受压构件。
发明内容
发明目的：为了克服现有技术中存在的不足，本发明提供一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，具有结构简单、承载力高、耐久性能好、全寿命周期成本低等特点，可就地取材，节约资源，节省成本，施工方便，保证工期。
技术方案：为实现上述目的，本发明采用的技术方案为：
一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，包括成型FRP圆角方管、FRP螺旋箍筋、金属扣件和全珊瑚骨料海水混凝土；
其中，所述FRP螺旋箍筋同中心轴线布置于成型FRP圆角方管内，通过布置于成 型FRP圆角方管内壁中心线上的金属扣件实现FRP螺旋箍筋与成型FRP圆角方管的固定，且全珊瑚骨料海水混凝土浇筑于成型FRP圆角方管内。
本发明中，所述成型FRP方管位于柱子的最外侧，耐腐蚀，防止氯离子渗入混凝土柱内，并且对核心混凝土起约束作用，同时在具体施工时可以作为浇筑混凝土的模板；螺旋FRP箍筋与沿圆周均布的纵向FRP筋绑扎固定，绑扎方式可以为扎丝或者塑料绷带绑扎，纵向FRP筋至少四根，螺旋箍筋最外侧直径小于FRP方管内边长40-60mm，便于将螺旋箍筋笼放入FRP管内，同时便于通过金属扣件控制箍筋保护层厚度；将绑扎好的螺旋箍筋笼放入FRP管内，通过金属扣件连接，使其形成一个整体，便于浇筑时控制箍筋笼位置以及保护层厚度；全珊瑚骨料海水混凝土浇筑于方FRP管内，形成FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱。
进一步的，所述成型FRP圆角方管采用成型圆角方形玻璃纤维管(GFRP)、玄武岩纤维管(BFRP)、碳纤维管(CFRP)或芳纶纤维管(AFRP)等，且管壁厚3mm-6mm，采用圆角FRP管是为了防止构件受压时在FRP管过早在柱身角部断裂。
进一步的，所述FRP螺旋箍筋和纵向FRP筋采用BFRP、GFRP、CFRP或AFRP中的一种或者多种，其中筋材直径和箍筋间距根据构件尺寸、设计承载力选定。
进一步的，所述金属扣件为防锈材质金属扣件(宜采用不锈钢材质，或者在表面喷涂防锈漆，防止扣件锈蚀)，包括相适配的T型底座和U型卡扣，T型底座利用环氧树脂粘贴在成型FRP圆角方管内壁上，U型卡扣穿过螺旋箍筋与T型底座卡扣连接。
采用金属扣件连接螺旋箍筋与方形FRP管，使其成为一个整体，便于控制箍筋笼在FRP管中位置以及保护层厚度，防止混凝土浇筑时箍筋笼位置移动，早造成箍筋笼倾斜，影响约束效果以及柱的最终承载力。
进一步的，所述全珊瑚骨料海水混凝土由水泥、珊瑚骨料、珊瑚砂、海水和减水剂按一定比例配制而成，强度等级不低于C40；
其中，所述珊瑚骨料的堆积密度在900～1100kg/m 3，表观密度1800～2300kg/m 3，筒压强度一般不低于2.5MPa，氯离子含量0.006％～0.074％，孔隙率50％左右；所述珊瑚砂为钙质砂，钙质含量90％以上，粒径大部分在0.8～1.2mm之间，容重一般为1.31g/m 3，比重2.80，孔隙率53％左右。
进一步的，所述全珊瑚骨料海水混凝土中各组分配比为：水泥540kg/m 3，珊瑚粗骨料560kg/m 3，珊瑚砂710kg/m 3，海水用量220kg/m 3，Sika三代减水剂7.5kg/m 3，且水泥 采用42.5抗硫酸盐水泥或者42.5普通硅酸盐。
进一步的，所述全珊瑚骨料海水混凝土的拌制方法为：1)首先利用破碎机将干燥的珊瑚石破碎成5-20mm粒径，要求级配良好并控制针片状珊瑚含量，破碎之后过5mm方孔筛，筛除破碎产生的多于粉末；2)将珊瑚砂、破碎后的珊瑚粗骨料放入搅拌机拌和30s,然后边搅拌边加入1/2总海水用量搅拌1min；3)将水泥倒入搅拌机搅拌30s，并将减水剂与剩余拌合水混合倒入搅拌机继续拌和2min。
有益效果：本发明提供的一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，相对于现有技术，具有以下优点：
1、采用海水、珊瑚礁、珊瑚砂作为混凝土原料，缓解岛礁工程建设淡水资源、沙石紧缺等问题，缩短施工周期；
2、采用方形FRP管和FRP螺旋箍筋的组合，使得所述混凝土柱不仅具有圆形柱承载能力高的特点，同时还具有方形柱施工简便，利于空间布置的优点，同时采用FRP材料使得该构件具有优良的耐久性能；
3、以扣件形式将螺旋箍筋笼与FRP管固定，使其成为一个稳定的整体，且便于实际施工时控制螺旋箍筋笼位置及保护层厚度；
4、加工简单，施工方便，相同承载力下减小了柱截面积，承载能力高，延性、耐久性能好，全寿命周期成本低。
附图说明
图1为本发明实施例的整体结构示意图；
图2为本发明实施例中成型FRP圆角方管的结构示意图；
图3为本发明实施例中FRP螺旋箍筋的结构示意图；
图4为本发明实施例中金属扣件的结构示意图；
图5为本发明实施例中混凝土柱的截面示意图；
图中包括：1、成型FRP圆角方管，2、全珊瑚骨料海水混凝土，3、纵向FRP筋，4、FRP螺旋箍筋，5、T型底座，6、U型卡扣。
具体实施方式
下面结合附图及实施例对本发明作更进一步的说明。
如图1-3所示为一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土 柱，包括成型FRP圆角方管1、FRP螺旋箍筋4、金属扣件和全珊瑚骨料海水混凝土2；
其中，所述FRP螺旋箍筋4同中心轴线布置于成型FRP圆角方管1内，通过布置于成型FRP圆角方管1内壁中心线上的金属扣件实现FRP螺旋箍筋4与成型FRP圆角方管1的固定，且全珊瑚骨料海水混凝土2浇筑于成型FRP圆角方管1内，形成如图5所示的混凝土柱截面。
本实施例中，所述FRP螺旋箍筋4上绑扎固定有至少四根沿圆周均布的纵向FRP筋3，且FRP螺旋箍筋4的外径小于成型FRP圆角方管1内边长40-60mm。
所述成型FRP圆角方管1可采用成型圆角方形玻璃纤维管GFRP、玄武岩纤维管BFRP、碳纤维管CFRP或芳纶纤维管AFRP等，且管壁厚3mm-6mm。
所述FRP螺旋箍筋4和纵向FRP筋3可采用BFRP、GFRP、CFRP或AFRP中的一种或者多种。
如图4所示，所述金属扣件为防锈材质金属扣件(采用不锈钢材质，或者在表面喷涂防锈漆，防止扣件锈蚀)，其包括相适配的T型底座5和U型卡扣6，其中，T型底座5利用环氧树脂粘贴在成型FRP圆角方管1内壁上，U型卡扣6穿过螺旋箍筋与T型底座5卡扣连接。
所述全珊瑚骨料海水混凝土2由水泥、珊瑚骨料、珊瑚砂、海水和减水剂按一定比例配制而成，强度等级不低于C40；
其中，所述珊瑚骨料的堆积密度在900～1100kg/m 3，表观密度1800～2300kg/m 3，筒压强度一般不低于2.5MPa，氯离子含量0.006％～0.074％，孔隙率50％左右；所述珊瑚砂为钙质砂，钙质含量90％以上，粒径大部分在0.8～1.2mm之间，容重一般为1.31g/m 3，比重2.80，孔隙率53％左右。
所述全珊瑚骨料海水混凝土2中各组分配比为：水泥540kg/m 3，珊瑚粗骨料560kg/m 3，珊瑚砂710kg/m 3，海水用量220kg/m 3，Sika三代减水剂7.5kg/m 3，且水泥采用42.5抗硫酸盐水泥或者42.5普通硅酸盐；其拌制方法为：1)首先利用破碎机将干燥的珊瑚石破碎成5-20mm粒径，要求级配良好并控制针片状珊瑚含量，破碎之后过5mm方孔筛，筛除破碎产生的多于粉末；2)将珊瑚砂、破碎后的珊瑚粗骨料放入搅拌机拌和30s,然后边搅拌边加入1/2总海水用量搅拌1min；3)将水泥倒入搅拌机搅拌30s，并将减水剂与剩余拌合水混合倒入搅拌机继续拌和2min。
本发明所述全珊瑚骨料海水混凝土柱的制备方法包括以下步骤：
A、如图3所示，制作FRP螺旋箍筋笼，其中至少采用四根纵向FRP筋3与FRP螺旋箍筋4固定，固定可以用扎丝或者塑料捆扎带将螺旋箍筋4与纵向FRP筋3筋绑扎固定时要注意，调整螺旋箍筋间距均匀分布；
B、根据选定的螺旋箍筋间距，将金属扣件底座部分5用环氧树脂粘贴在FRP管内壁四面的中心线上、根据螺旋箍筋间距调整底座间距，然后将绑扎好的螺旋箍筋笼放入方形成型FRP管1中，要求FRP管与箍筋笼中心对齐，调整好位置之后用卡扣6穿过螺旋箍筋，依次扣在扣件底座5上，这样就可以将FRP螺旋箍筋固定在FRP馆上，使FRP管与螺旋箍筋形成一个整体，在浇筑混凝土时便于控制箍筋笼位置以及保护层厚度，柱截面如图5所示。
由于混凝土采用海水拌制，并且构件所处环境为南海高温、高湿、高盐环境，因此弹性金属扣件5、6宜采用不锈钢材质，或者在表面喷涂防锈漆，防止扣件锈蚀。
C、拌制全珊瑚骨料海水混凝土2：首先利用破碎机将干燥的珊瑚石破碎成5-20mm粒径，要求级配良好并控制针片状珊瑚含量，破碎之后过5mm方孔筛，筛除破碎产生的多于粉末；将珊瑚砂、破碎后的珊瑚粗骨料放入搅拌机拌和30s，然后边搅拌边加入1/2总海水用量搅拌1min；将水泥倒入搅拌机搅拌30s，并将减水剂与剩余拌合水混合倒入搅拌机继续拌和2min。
所述全珊瑚骨料海水混凝土各组分配比：水泥：优选42.5抗硫酸盐水泥或者42.5普通硅酸盐水泥540kg/m3，珊瑚粗骨料560kg/m3，珊瑚砂710kg/m3，用水量220kg/m3，Sika三代减水剂7.5kg/m3。
D、将拌制的全珊瑚骨料海水混凝土浇筑于FRP管内，养护28天即形成扣件式FRP螺旋箍筋增强FRP管全珊瑚骨料海水混凝土柱。
本发明中，所述方形FRP管、螺旋形FRP箍筋、FRP直筋、金属扣件都具有优良的耐腐蚀性能，为在海洋环境下直接利用全珊瑚骨料海水混凝土提供了前提条件，由于FRP材料具有优良的抗拉性能，FRP管与FRP螺旋箍筋对核心混凝土的双重约束大大提高了所述混凝土柱的承载能力，弥补了目前珊瑚混凝土强度不高，难以应用到工程主要受力构件上的缺陷。同时在岛礁工程中，就地取材，采用岛礁常见的珊瑚礁砂和海水，节省了成本，缩短了工期，大大推进了海洋岛礁工程的建设。
以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员 来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (8)

  1. 一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，其特征在于，包括成型FRP圆角方管(1)、FRP螺旋箍筋(4)、金属扣件和全珊瑚骨料海水混凝土(2)；
    其中，所述FRP螺旋箍筋(4)同轴布置于成型FRP圆角方管(1)内，通过布置于成型FRP圆角方管(1)内壁上的金属扣件实现FRP螺旋箍筋(4)与成型FRP圆角方管(1)的固定，且全珊瑚骨料海水混凝土(2)浇筑于成型FRP圆角方管(1)内。
  2. 根据权利要求1所述的一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，其特征在于，所述FRP螺旋箍筋(4)上绑扎固定有至少四根沿圆周均布的纵向FRP筋(3)，且FRP螺旋箍筋(4)的外径小于成型FRP圆角方管(1)内边长40-60mm。
  3. 根据权利要求1所述的一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，其特征在于，所述成型FRP圆角方管(1)采用成型圆角方形玻璃纤维管、玄武岩纤维管、碳纤维管或芳纶纤维管，且管壁厚3mm-6mm。
  4. 根据权利要求2所述的一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，其特征在于，所述FRP螺旋箍筋(4)和纵向FRP筋(3)采用BFRP、GFRP、CFRP或AFRP中的一种或者多种。
  5. 根据权利要求1所述的一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，其特征在于，所述金属扣件为防锈材质金属扣件，其包括相适配的T型底座(5)和U型卡扣(6)，其中，T型底座(5)利用环氧树脂粘贴在成型FRP圆角方管(1)内壁上，U型卡扣(6)穿过螺旋箍筋与T型底座(5)卡扣连接。
  6. 根据权利要求1所述的一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，其特征在于，所述全珊瑚骨料海水混凝土(2)由水泥、珊瑚粗骨料、珊瑚砂、海水和减水剂按比例配制而成；
    其中，所述珊瑚粗骨料的堆积密度为900～1100kg/m 3，且表观密度为1800～2300kg/m 3，筒压强度不低于2.5MPa，氯离子含量为0.006％～0.074％，孔隙率为50％；所述珊瑚砂为钙质砂，钙质含量90％以上，粒径在0.8～1.2mm之间，容重为1.31g/m 3，比重为2.80，孔隙率为53％。
  7. 根据权利要求6所述的一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，其特征在于，所述全珊瑚骨料海水混凝土(2)中各组分配比为：水泥 540kg/m 3，珊瑚粗骨料560kg/m 3，珊瑚砂710kg/m 3，海水用量220kg/m 3，Sika三代减水剂7.5kg/m 3，且水泥采用42.5抗硫酸盐水泥或者42.5普通硅酸盐。
  8. 根据权利要求7所述的一种扣件式FRP螺旋箍筋增强方形FRP管全珊瑚骨料海水混凝土柱，其特征在于，所述全珊瑚骨料海水混凝土(2)的拌制方法为：
    1)利用破碎机将干燥的珊瑚石破碎成5-20mm粒径，破碎之后过5mm方孔筛，筛除破碎产生的多于粉末；
    2)将珊瑚砂、破碎后的珊瑚粗骨料放入搅拌机内搅拌30s，然后边搅拌边加入1/2总海水用量搅拌1min；
    3)将水泥倒入搅拌机继续搅拌30s，而后将减水剂与剩余拌合水混合倒入搅拌机继续拌和2min。
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CN115095181A (zh) * 2022-05-27 2022-09-23 上海应用技术大学 一种增强磷酸镁水泥砂浆柱体加固结构及其使用方法
CN116730689A (zh) * 2023-08-10 2023-09-12 湘潭大学 玄武岩纤维增强珊瑚砂混凝土及其制备方法
CN116730689B (zh) * 2023-08-10 2023-11-14 湘潭大学 玄武岩纤维增强珊瑚砂混凝土及其制备方法

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