CN1067966C - 粘锚式包钢加固粘结材料及加固工法 - Google Patents

粘锚式包钢加固粘结材料及加固工法 Download PDF

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CN1067966C
CN1067966C CN96119044A CN96119044A CN1067966C CN 1067966 C CN1067966 C CN 1067966C CN 96119044 A CN96119044 A CN 96119044A CN 96119044 A CN96119044 A CN 96119044A CN 1067966 C CN1067966 C CN 1067966C
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steel
claded
adhesive material
cement
matrix material
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CN1160695A (zh
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邓天宁
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Luban Building Water-Proofing & Strengthening Special Co Guangzhou City
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Luban Building Water-Proofing & Strengthening Special Co Guangzhou City
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/26Corrosion of reinforcement resistance

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

本发明涉及建筑混凝土结构及构件加固,特别是包钢加固粘结材料及工法。其特点是粘结材料由树脂乳液,或固化剂,石英粉,水泥等聚合而成,由于水泥在含有50%水份的环氧乳液内起水化反应,形成无机胶结材料。而施工时则采用锚固方式。本发明的优点是:原结构钢筋与补强钢板的应力同步率高,并有效地解决了老化问题,使粘钢法成为永久加固法,同时施工方便,且造价低。

Description

粘锚式包钢加固粘结材料及加固工法
本发明涉及建筑混凝土结构及构件加固,特别是包钢加固的粘结材料及工法。
现有技术粘结钢板(筋)加固混凝土技术使用的粘剂是环氧树酯系列或是改性环氧树酯,俗称结构胶,都是高分子材料。这些粘结剂有如下缺点:1)容易老化;2)环氧树酯粘结剂的弹性模量较混凝土低一个置级,因此混凝土变形时,通过这低弹性模量的材料传递应力到钢板则会造成钢板与混凝土之间的应力不同步和应变滞后,这样就造成原梁钢筋屈服破坏而外贴钢板远未超过弹性阶段的浪费现象;3)由于环氧胶比起混凝土和钢板密度小,弹模低,容量少,造成由温差变形或受力变形不协调,不同步,这样就会造成材料之间的界面应力集中积聚和疲劳,从而破坏界面粘结力又称为界面粘结力老化。上述材料的缺点,使包钢补强法难以发展,也被不少专家判定为临时加固法。
而目前的加固工法使用临时支撑,有如下缺点:1、设置临时支撑在很多情况下会影响周围的空间的正常使用,使工作造价升高,在某些情况下甚至是不允许的;2、临时支撑设置法向力,对于梁板等物件是可行的,但对于抗剪力墙等物件就很难设置法向力的支撑了,这样限制了粘钢技术的使用范围。
本发明的目的是提供一种耐老化性能良好,施工方便,使用范围广泛,并能永久加固的包钢粘结剂及施工方法。
本发明的技术方案是:采用聚合物水泥浆作为粘结剂代替高分子纯有机材料-环氧胶。聚合物的成份和配比如下:环氧乳液或阳离子丁胶乳∶聚酰氨∶石英粉∶水泥=18~23∶4~7∶20~25∶40~55。施工方法包括:在构件上铅螺栓孔,安装膨胀螺栓,构件表面混凝土涂界面剂作界面处理,用上述粘结材料粘贴钢板,上紧膨胀螺栓的螺母。
本发明的优点:1)粘结材料由无机材料组成,有效解决老化问题,使粘钢法成为永久加固法;2)使原钢筋与补强强钢板的应力同步率高达99%,钢板与构件共同工作所需的力传递由粘结材料的粘结力和膨胀螺栓的预加法向应力共同组成,结构安全度较高;3)由于膨胀螺栓的压紧作用不需设置临时支撑,为建筑物的正常使用提供方便,同时也降低了工程造价。
本发明采用了聚合物水泥浆作为粘结剂代换高分子纯有机材料-环氧胶,这种材料主要成份是树脂乳液、水泥、石英粉,或固化剂,这种胶的商品名称为TN胶,由于是乳化了的环氧,水泥在含有50%水份的环氧乳液内起到水化反应,形成无机胶结材料,从而把有机材料的高力学性能和无机材料的耐老化性能很好地结合在一起了。此外这样结合,使NT胶的固结体剪切弹性模量大大地提高,从原来的纯环氧102Mpa提高到103Mpa,这样就有效地解决了传统粘结胶的通病。
具体实施配方及效果如下:
一、环氧乳液∶聚酰氨∶石英粉∶525#普通硅酸盐水泥=20∶5∶23∶52
其主要力学性能指标如下:
固化时间:5小时
粘结抗剪强度(10天龄期):3.01Mpa~4.0Mpa
粘结弯曲抗拉强度(10天龄期):2.71Mpa~3.5Mpa
粘结立方抗压强度(28天龄期):23.0Mpa~40Mpa
抗压弹性模量(38天龄期):1.05×104Mpa
剪切弹性模量(30天龄期):3.57×103Mpa
二、阳离子氯丁胶乳∶聚酰氨∶石英粉∶水泥=18∶4∶20∶55。力学性能指标同上。
本发明的施工方法改进了以往临时支撑的做法,用永久锚杆代替。更有效地提供粘胶剂固结前的法向力,永久锚固增加了界面抗剪粘结力(但不作计算依据,只作保险系数)。
本发明的施工方法包括了:在构件上钻螺栓孔;安装膨胀螺栓;构件表面混凝土涂界面剂作界面处理;用粘结材料粘贴钢板;上紧膨胀螺栓的螺母。下面通过附图进一步说明本发明。
附图1,柱包钢构造示意图;
附图2,梁包钢构造示意图。
图中,混凝土构件1,钢板2,粘结材料3,界面4,膨胀螺栓5。

Claims (3)

1,一种粘锚式包钢加固粘结材料,其特征在于:粘结材料聚合物包括:环氧乳液或阳离子丁胶乳∶聚酰氨∶石英粉∶水泥=18~23∶4~7∶20~25∶40~55。
2、根据权利要求1所述的粘锚式包钢加固粘结材料,其特征在于:环氧乳液或阳离子丁胶乳∶聚酰氨∶石英粉∶水泥=20∶5∶23∶52。
3、粘锚式包钢加工固工法,其特征在于:施工步骤如下:在物件上钻螺栓孔,安装膨胀螺栓,构件表面混凝土涂界面剂,用环氧乳液或阳离子丁胶乳∶聚酰氨∶石英粉∶水泥=18~23∶4~7∶20~25∶40~55组成的粘结材料粘贴钢板,上紧膨胀螺栓的螺母。
CN96119044A 1996-03-25 1996-03-25 粘锚式包钢加固粘结材料及加固工法 Expired - Fee Related CN1067966C (zh)

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Publication number Priority date Publication date Assignee Title
CN101845898B (zh) * 2010-05-24 2012-07-25 深圳大学 一种钢筋混凝土结构电化学性嵌入式加固方法及装置
CN103452331B (zh) * 2013-09-02 2016-08-10 辽宁工业大学 混凝土梁抗剪加固方法
CN108518080B (zh) * 2018-05-04 2020-05-22 山西多特建筑工程技术有限公司 一种粘钢加固建筑高效施工设备
CN109181449A (zh) * 2018-08-23 2019-01-11 崔亭昊 Fs外墙保温一体模板用界面剂

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85106610A (zh) * 1985-09-02 1987-03-25 冯正洋 混合粘接机
CN87203666U (zh) * 1987-03-10 1988-07-27 魏太良 水泥钢制品
CN1038263A (zh) * 1989-03-29 1989-12-27 辽河石油勘探局茨榆坨采油厂 二次浇注用的环氧树脂水泥沙浆

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85106610A (zh) * 1985-09-02 1987-03-25 冯正洋 混合粘接机
CN87203666U (zh) * 1987-03-10 1988-07-27 魏太良 水泥钢制品
CN1038263A (zh) * 1989-03-29 1989-12-27 辽河石油勘探局茨榆坨采油厂 二次浇注用的环氧树脂水泥沙浆

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