表二 蜂巢芯破损容许修补标准 蜂巢芯高H（mm） ≤200 200～300 H/4 100 3 H/4 300～400 H/5 100 3 H/4 >400 H/6 100 3 H/4 H/3 容许一般蜂巢芯高度方向 破损 蜂巢芯面板（mm） 100 一般破损密度处/m 容许单处最大高度破损 4.3.4 蜂巢芯的安装
（1）布置蜂巢芯的原则是从梁边开始由一端向另一端摆放标准芯，不合模数的尺寸应布置在楼盖四周，且应摆放异型配套蜂巢芯。若尺寸既不合模数又不足以布放一个最小配套蜂巢芯，则应将该尺寸分摊到每肋或在一边增加φ8钢筋两道设混凝土加强带。
（2）放蜂巢芯前应将模板上的杂物清理干净，保证蜂巢芯不翘曲、不进混凝土浆液，且吊运过程中洒落的杂物应及时清理。
（3）吊放芯时应注意成排成行，保证蜂巢芯之间及芯与梁、墙、柱之间的间距符合设计要求。
（4）布置完成后应检查是否有破损，对损坏的蜂巢芯应根据情况进行修补或更换。验收合格后方可进行下道工序的施工。
4.3.5 蜂巢芯安装的注意事项
（1）蜂巢芯密肋楼盖的支撑体系安装和拆除纵横向整体稳定、安全可靠，并按照要求起拱。起拱高度以为跨度的 2/1000~3/1000蜂巢芯的摆放方向、位置应符合设计要求，顺直度的允许偏差不应大于 3/1000，且不应大于15mm。
（2）蜂巢芯定位应按照设计图纸摆放，蜂巢芯底板位置应准确、纵横垂直平行，蜂巢芯底板间的缝隙不宜大于3mm。施工过程中应防止蜂巢芯损坏、出现明显破损时应及时予以更换。
（3）对密肋板面钢筋铺设之后损坏的蜂巢芯，应采取有效的修补措施封堵。施工过程中的预留、预埋设施（水平管线、电线盒等）安装与钢筋铺设及蜂巢芯安装就位等工序应合理安排、有序进行。
（4）预留和预埋设施宜布置在密肋板实心区域或肋宽范围内。当预留和预埋设施无妨避开蜂巢芯时，可对蜂巢芯采取开口措施，但事后应封堵。在管线密集处，可采取采用小型号蜂巢芯等避让措施。施工中应根据设计要求留设各种孔洞，尽量避免施工后二次开洞。密肋板面层钢筋的规格型号、数量以及铺设绑扎方式应符合设计要求。
（5）在混凝土浇筑之前，应对钢筋和预留、预埋设施的安装质量进行检查验收。 4.4 混凝土工程
（1） 原材料的选用。因蜂巢芯之间的密肋梁断面小，故应选用10mm～30mm粒径的小粒级石子作为粗骨料，选含泥量小于3%的水洗砂作为细骨料。
3 H/4
（2） 既要保证混凝土的强度，又要满足泵送混凝土要求，所以控制好水灰比尤为重要。经现场测试该工程所用混凝土水灰比应控制在0.47～0.53之间，混凝土拌合物坍落度宜取140mm～160mm。
（3）混凝土的浇筑，宜延蜂巢芯的纵轴单向进行；且布料与震捣同步进行，以保证肋间混凝土充填饱满，无积存气囊、气泡。
（4）浇筑混凝土蜂巢芯楼盖时，宜采用小型插入震动器（3cm）震捣，不得将震动器直接触压蜂巢芯进行震捣。
（5）蜂巢芯高度超过450mm的楼板，混凝土浇注时宜分次进行。第一次布料高度不超过芯盒高度的3/5，待震动棒震实再进行第二次布料。
（6）在浇筑混凝土时，如遇现场蜂巢芯变形过大或破损，应及时采用支护挡板措施，用以抵抗混凝土对蜂巢芯的压力，以蜂巢芯盒内不进混凝土为准。
（7）混凝土浇筑时要安排专人随浇筑作业及时修补调整盒芯和钢筋。 5 结束语
目前，我国仍以传统的钢筋混凝土结构与新兴的钢结构、钢和混凝土组合结构的楼盖体系为主。GBF蜂巢芯空心楼盖施工技术，是建筑结构领域内的一项革新。
本工程采用GBF蜂巢芯密肋楼盖结构，与无粘结预应力无梁楼盖、实心无梁楼板比较，无柱帽，实现了真正的平板，使用功能得到了改善，同时由于楼板混凝土体积减少，减轻了自重，并且具有较好的抗震性能，良好的隔音、保温隔热等特点。而且由于建筑材料的节约与施工的便利，带来了良好的经济效益。
总之，该项技术目前的应用已日趋成熟，在建筑业以后的发展中，这种楼盖体系会逐渐在北方地区推广。
作者简介：吕新伟，男，助理工程师，1976年生，中铁三局集团第四工程有限公司 北京。
参考文献：
【1】《混凝土结构工程施工质量验收规范》GB50204-2011 【2】《建筑施工扣件式钢管脚手架安全技术规范》JGJ130-2011 【3】《建筑施工门式钢管脚手架安全技术规范》JGJ128-2010 【4】《建筑结构荷载规范》GB50009-2012 【5】《钢结构设计规范》GB50017-2003
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