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施工技术研究
王 靖1,2，刘俊元1,2，孔 韬1,2，查炎鹏1,2，赖振峰1,2，彭 静1,2
摘 要：将聚醚三元醇MN-500、EP-330N、MOCA、水发泡剂、匀泡剂、开孔剂、氧化铝耐磨填料、复合催化剂按比例搅拌均匀后，再与异氰酸酯预聚物混合反应制备了不同硬度和密度的微孔聚氨酯材料。分别研究了硬段含量、水发泡剂对聚氨酯材料密度、硬度和力学性能的影响。结果表明，聚氨酯的拉伸强度和硬度随着硬段含量的增加而逐步增大，断裂伸长率则是逐渐下降。随着水发泡剂用量的提升，材料的拉伸强度从4.1MPa降至1.7MPa，断裂伸长率从425%降至326%。发泡剂用量为0.10%时，其内部孔径为0.2～0.5mm。表层经过激光微孔化处理后得到三维微孔聚氨酯材料，具有良好的透水汽性，以此作为模板衬模浇筑出来的混凝土表面致密、光洁平整、均匀，很大程度上减少了蜂窝麻面、砂线和裂纹。Abstract:MicroporouspolyurethanematerialswithdifferenthardnessanddensitywerepreparedbymixingpolyetherMN-500,EP-330N,MOCA,waterfoamingagent,homogenizer,porousagent,wear-resistantfillerofalumina,compositecatalystandisocyanateprepolymerinproportion.Theeffectsofhardsegmentcontentandwaterfoamingagentonthedensity,hardnessandmechanicalpropertiesofpolyurethanematerialswerestudied.Theresultsshowsthatthetensilestrengthandhardnessofpolyurethanegraduallyincreasewiththeincreaseofhardsegmentcontent,whiletheelongationatbreakdecreases.Withtheincreaseoftheamountofwaterfoamingagent,thetensilestrengthofthematerialdecreasesfrom4.1MPato1.7MPa,andtheelongationatbreakdecreasesfrom425%to326%.Whenthedosageoffoamingagentis0.10%,theinnercelldiameteris0.2～0.5mm.Three-dimensionalmicroporouspolyurethanematerialisobtainedafterlasermicroporoustreatment,whichhasgoodwatervaporpermeability.Thesurfaceofconcretepouredwiththismaterialastemplateliningiscompact,smoothanduniform,whichgreatlyreduceshoneycomblinen,sandlineandcracks.
王靖,刘俊元,孔韬,等.三维透气微孔聚氨酯材料的制备及其在混凝土模具中的应用[J]混凝土与水泥制品,2020(6):86-89.
WANG J,LIU J Y,KONG T,et al.Preparation of Three-dimensional Mocroporous Polyurethane and Its Application in Concrete[J].China Concrete and Cement Products,2020(6):86-89.
唐自强1，陈孝湘2，黄晓予1，林宇彬1，陈学东1，夏才初3
摘 要：在借鉴钢与混凝土组合梁原理的基础上，结合沉井施工工艺，研究了钢梁作为钢模板结构和作为组合梁顶板结构一部分的全过程受力机理，提出了钢与混凝土组合梁板结构在沉井顶板结构中应用的技术方案，并以内净空跨度6m的顶板结构为例，开展了组合梁板结构的优化设计。结果表明，与现浇结构相比，组合梁板结构的施工工期短，但在设计时应考虑防水、结构耐久性等问题；组合梁中钢梁的横向布置间距可从l0/3处开始优化分析。Abstract:Basedontheprincipleofsteel-concretecompositebeam,combinedwiththeconstructiontechnologyofopencaisson,thewholeprocessstressmechanismofsteelbeamassteelformworkstructureandasapartofcompositebeamroofstructurewasstudied.Thetechnicalschemeofsteel-concretecompositebeam-slabstructureappliedinopencaissonroofstructurewasputforward,andtheroofstructurewithaninternalclearancespanof6mwastakenasanexampletooptimizethedesignofthecompositebeam-slabstructure.Theresultsshowthatcomparedwiththecast-in-placestructure,theconstructionperiodofthecompositebeam-slabstructureisshorter,buttheproblemssuchaswaterproofandstructuraldurabilityshouldbeconsideredinthedesign.Theoptimaldesignofthetransversespacingofsteelbeamsincompositebeamscanbestartedfroml0/3.
唐自强,陈孝湘,黄晓予,等.钢与混凝土组合梁板结构在沉井顶板中的应用[J]混凝土与水泥制品,2020(6):82-85+89.
TANG Z Q,CHEN X X,HUANG X Y,et al.Application of the Steel-concrete Composite Beam-slab Structure in the Open Caisson Roof[J].China Concrete and Cement Products,2020(6):82-85+89.