涤纶高分子防水卷材(1.5mm厚),如何现场测量其厚度及质量?
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SPS:改性沥青防水卷材以聚酯毡或玻纤毡为胎基,苯乙烯-丁二烯-苯乙烯(SBS)热塑性弹性体作改性剂,两面覆以断绝质料所制成的建筑防水卷材。从胎基辨认SBS卷材--从产物的断面上进行目测,详细方式可将产物用手将其扯破,观测断面上冒出的胎基纤维,撕开后断面上有网格布的筋冒出。 以下是以下为SBS改性沥青防水卷材施工的方法,供您参考。 (1)施工部位结构底板和结构侧墙采用双层4mm厚的SBS改性沥青防水卷材铺设,其中:迎水面一侧的材料可采用SBS Ⅱ PYPE4类材料;背水面一侧的材料必须采用SBS Ⅱ PYS4类材料,且砂面须面向结构外表面(2)基层处理要求 1、混凝土垫层和围护桩表面不得有明水,否则应进行堵漏处理,待基层表面无明水时,再做找平层。 2、找平层采用1:2.5的普通水泥砂浆,厚度不得小于20mm。 3、找平层表面应平整,其平整度用2m的靠尺进行检查,直尺与基层的间隙不超过5mm,且只允许平缓变化。 4、找平层表面、干燥,不得有明水流,允许出现局部潮湿部位,不得有酥松、掉灰、空鼓、裂缝、剥落和污物等部位存在。 5、左右阴角部位均采用1:2.5的水泥砂浆做成50mm×50mm的钝角或R≥5cm的圆角。(3)铺设顺序及方法 1、首先在达到设计要求的阴阳角部位铺设防水卷材加强层。加强层卷材采用单层SBS Ⅱ PYPE类材料,宽度为500mm,厚度同作为防水层的单层卷材的厚度,转角两侧各250mm。加强层卷材采用点粘或条粘法固定在基面上。 2、当有管、件等穿过防水层时,应先铺设此部位的加强卷材,加强层卷材采用满粘法固定在基面上,大面防水层满粘固定在加强层表面。 3、铺设底板大面防水层时,第一层均空铺在底板基面上,防水层幅面间的搭接宽度100mm,采用热熔满粘焊接。第一层防水层与阴、阳角部位的加强层热熔满粘。 4、铺设第二层防水层,砂面向上。第二层防水层采用满粘法与第一层防水层热熔焊接。第二层搭接宽度为100mm,热熔满粘,第一层防水层与第二层防水层的搭接缝错开1/2~1/3幅宽。两层卷材不得垂直铺设。底板防水层铺设完毕后,应立即浇注C20的细石混凝土保护层,厚度为50mm。 5、立面的第一层防水层采用点粘或者条粘法固定,第二层防水层与第一层防水层满粘粘贴,搭接要求同底板防水层。要求防水层甩槎的长度均应超过预留钢筋顶部至少200mm。如果现场无法满足此要求,则应将预留部分的防水卷材卷起后吊挂并采取措施进行有效的保护。 6、防水层在底板施工缝部分的预留搭接部分(超出钢筋的部分)应采取临时措施进行保护(木板、聚苯板等硬质材料覆盖),避免后续施工过程中受到破坏。 7、铺设侧墙防水层时,首先铺设第一层大面积卷材,但在变形缝部位两侧各150mm范围内空铺。第二层大面积SBS卷材与第一层满粘。侧墙防水层应连续铺设至顶板上表面400mm以上。 8、施工缝和变形缝部位均应铺设防水加强层。施工缝防水加强层采用单层SBSIIPYS4类材料,加强层宽度为50cm,砂面应面向施工人员;变形缝顶板部位加强层采用厚1.5mm、宽1.0m的优质丁基橡胶双面冷自粘防水卷材,其中骑缝两侧各20cm(共40cm)范围内的隔离膜保留作为隔离层,外侧各30cm范围隔离膜撕掉与主体结构基面必须满粘,不得有空鼓及折皱,卷材加强层上表面隔离膜撕掉后涂刷“防水涂膜加强层,加强层厚1mm”,涂刷完防水涂膜加强层后,立即在加强层涂膜表面粘贴增强层,最后涂刷大面防水层。侧墙及底板均采用厚1.5㎜,宽1.0m的优质丁基橡胶双面冷自粘防水卷材用于大面防水层(SBS改性沥青卷材)与1.5mm厚宽1.0m的合成高分子预铺式冷自粘防水卷材之间,组成“复合防水加强层”。 9、侧墙防水层分段铺设完毕后,除需要进行后续搭接的防水层外,均需要及时施做保护层,保护层采用1:2.5的水泥砂浆,厚度不小于15mm。但变形缝背贴式止水带即可代替保护层,更有利于适应变形。 10、预留洞口(车站与出入口通道、车站与通风道、车站与区间接口)四周的防水层均需要采用厚度不小于10mm的复合板进行保护。
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