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(1 長沙市建筑設(shè)計(jì)院有限責(zé)任公司, 長沙 410007; 2 湖南科技大學(xué)土木工程學(xué)院, 湘潭 411201;3 江西省標(biāo)正技術(shù)工程有限公司, 南昌 330077)
摘要: 目前混凝土結(jié)構(gòu)裂縫化學(xué)注漿主要是針對平滑等寬的收縮類裂縫,注漿孔往往沿裂縫開展深度方向等距布置,這對于不等寬的受力裂縫常導(dǎo)致在表面溢漿的同時(shí),內(nèi)部未能有效封堵的質(zhì)量問題,嚴(yán)重影響注漿效果. 為此,對鋼筋混凝土梁進(jìn)行了反向加載試驗(yàn),研究了受彎裂縫寬度沿截面高度的變化規(guī)律,提出了鋼筋對受彎裂縫開展的有效約束范圍為 5. 9d(d 為鋼筋直徑),建立了考慮鋼筋約束作用的受彎裂縫寬度模型;結(jié)合環(huán)氧漿液擴(kuò)散半徑理論公式,提出了混凝土受彎裂縫的最佳鉆孔深度為距表面 0. 60H(H 為裂縫沿截面開展的總高度),該注漿孔位置可實(shí)現(xiàn)受彎裂縫表面溢漿的同時(shí),內(nèi)部亦能有效封堵的預(yù)期效果.
關(guān)鍵詞: 混凝土; 鋼筋約束作用; 注漿; 受彎裂縫; 鉆孔; 平滑等寬
中圖分類號:TU375 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2023)10-0128-06
DOI:10. 19701 / j. jzjg. LS220036
Research on grouting repair technology for concrete flexural cracks based on rebar restraint
WANG Meng1, LÜ Weirong2, YIN Guolin2, LU Beirong2, ZHONG Xiaojin3, WU Jidong2
(1 Changsha Architectural Design Institute Co. , Ltd. , Changsha 410007, China; 2 Department of Civil Engineering,Hunan University of Science and Technology, Xiangtan 411201, China; 3 Jiangxi Standard Technology EngineeringCo. , Ltd. , Nanchang 330077, China)
Abstract: At present, chemical grouting of cracks in concrete structures is mainly aimed at shrinkage cracks of smooth andequal width, and grouting holes are often arranged equidistant along the depth direction of cracks, which often leads to thesurface grouting overflow while the internal quality problem is not effectively blocked for cracks of unequal width, whichseriously affects the effect of grouting. Therefore, the reverse loading test of reinforced concrete beam was carried out, andthe law of bending crack width changing along the section height was studied. The effective constraint range of steel bar onbending crack was proposed to be 5. 9d (d is the diameter of steel bar), and the bending crack width model considering theconstraint effect of steel bar was established. Combined with the theoretical formula of diffusion radius of epoxy grout, it isproposed that the optimal drilling depth of concrete bending crack is 0. 60H from the surface (H is the total height of thecrack along the section). The grouting hole position can realize the expected effect of grouting overflow on the surface ofbending crack and effective plugging inside.
Keywords:concrete; rebar restraint; grouting; flexural crack; drilling; smooth and equal width
∗國家自然科學(xué)基金面上項(xiàng)目(51578235),湖南省研究生科研創(chuàng)新項(xiàng)目(CX20210993).
第一作者:王猛,碩士,高級工程師,一級注冊結(jié)構(gòu)工程師,主要從事工程結(jié)構(gòu)設(shè)計(jì),Email:31747603@ qq. com.
[引用本文] 王猛,呂偉榮,尹國林,等. 基于鋼筋約束作用的混凝土受彎裂縫注漿修復(fù)技術(shù)研究[ J]. 建筑結(jié)構(gòu),2023,53(10):128-133. WANG Meng,LÜ Weirong,YIN Guolin,et al. arch on grouting repair technology for concreteflexural cracks based on rebar restraint[J]. Building Structure,2023,53(10):128-133.
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