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钢结构通常åœ?50摄氏度~650摄氏度的温度中就会失åŽÀL‰¿è½½èƒ½åŠ›ï¼Œå‘生很大的åŞ变,å¯ÆD‡´é’¢æŸ±ã€é’¢æ¢å¼¯æ›ÔŒ¼Œ¾l“果因过大的形变而不能ç‘ô¾l­ä‹É用,一般不加保护的钢结构的耐火极限ä¸?5分钟左右。这一旉™—´çš„长短还与构件吸热的速度有关。要佉K’¢¾l“构材料在实际应用中克服防火斚w¢çš„不­‘»I¼Œå¿…é¡»˜q›è¡Œé˜²ç«å¤„理åQŒå…¶ç›®çš„ž®±æ˜¯ž®†é’¢¾l“构的耐火极限提高到设计规范规定的极限范围。防止钢¾l“构在火灾中˜q…速升温发生åŞ变塌落,其措施是多种多样的,关键是要æ ÒŽ®ä¸åŒæƒ…况采取不同æ–ÒŽ³•åQŒå¦‚采用¾lçƒ­ã€è€ç«ææ–™é˜»éš”火焰直接灼烧钢结构,降低热量传递的速度推迟钢结构温升、强度变å¼Þqš„æ—‰™—´½{‰ã€‚但无论采取何种æ–ÒŽ³•åQŒå…¶åŽŸç†æ˜¯ä¸€è‡´çš„。因此,½W”者认为在现实ä¸?¿Ué’¢¾l“构防火保护措施必须¾l™äºˆé‡è§†ã€?</p> <p style="text-indent:2em;"> 外包层。顾名思义åQŒå°±æ˜¯åœ¨é’¢ç»“构外表添加外包层åQŒå¯ä»¥çŽ°‹¹‡æˆåž‹ï¼Œä¹Ÿå¯ä»¥é‡‡ç”¨å–·æ¶‚法。现‹¹‡æˆåž‹çš„实体混凝土外包层通常用钢丝网或钢½{‹æ¥åŠ å¼ºåQŒä»¥é™åˆ¶æ”¶ç¾ƒè£‚缝åQŒåƈ保证外壳的强度。喷涂法可以在施工现场对钢结构表面涂抹砂‹¹†ä»¥å½¢æˆä¿æŠ¤å±‚,砂浆可以是石灰水泥或是石膏砂‹¹†ï¼Œä¹Ÿå¯ä»¥æŽºå…¥çç å²©æˆ–石‹‚‰ã€‚同æ—Óž¼Œå¤–包层也可以用珍珠岩、石‹‚‰ã€çŸ³è†æˆ–çŸÏx£‰æ°´æƒ”、轻混凝土做成预制板åQŒé‡‡ç”¨èƒ¶¾_˜å‰‚、钉子、螺栓固定在钢结构上ã€?</p> <p style="text-indent:2em;"> 充水水套。空心型钢结构内充水是抵御火灾最有效的防护措施。这¿Uæ–¹æ³•èƒ½ä½‰K’¢¾l“构在火灾中保持较低的温度,水在钢结构内循环åQŒå¸æ”¶ææ–™æœ¬íw«å—热的热量。受热的水经冷却后可以进行再循环或由½Ž¡é“引入凉水来取代受热的水ã€?</p> <p style="text-indent:2em;"> 屏蔽。钢¾l“构讄¡½®åœ¨è€ç«ææ–™¾l„成的墙体或™å¶æ£šå†…,或将构äšg包藏在两片墙之间的空隙里åQŒåªè¦å¢žåŠ å°‘许耐火材料或不增加卌™ƒ½è¾‘Öˆ°é˜²ç«çš„目的。这是一¿Uæœ€ä¸ºç»‹¹Žçš„防火æ–ÒŽ³•ã€?</p> <p style="text-indent:2em;"> 膨胀材料。采用钢¾l“构防火涂料保护构äšgåQŒè¿™¿Uæ–¹æ³•å…·æœ‰é˜²ç«éš”热性能好、施工不受钢¾l“构几何形体限制½{‰ä¼˜ç‚¹ï¼Œä¸€èˆ¬ä¸éœ€è¦æ·»åŠ è¾…助设施,且涂层质量轻åQŒè¿˜æœ‰ä¸€å®šçš„¾ŸŽè§‚装饰作用åQŒå±žäºŽçŽ°ä»£çš„先进防火技术措施ã€?</p> <p style="text-indent:2em;"> 目前åQŒé«˜å±‚é’¢¾l“构建筑日趋增多åQŒå°¤å…¶æ˜¯ä¸€äº›è¶…高层建筑åQŒé‡‡ç”¨é’¢¾l“构形式更äؓòq¿æ³›ã€‚高层徏½{‘一旦发生火灾事故,火不是在短时间内ž®Þpƒ½æ‰‘灭的,˜q™å°±è¦æ±‚我们在徏½{‘设计时åQŒåŠ å¤§å¯¹å»ºç­‘材料的防火保护,以增强其耐火极限åQŒåƈ在徏½{‘内部制定必要的应急方案,以减ž®‘äh员伤亡和财äñ”损失ã€?</p> <p style="text-indent:2em;"> <br /> </p></p> </div> <p><div>上一æ?<a href="152.html">矛_®¶åº„é’¢¾l“构表面处理及涂装的新工艺技æœ?/a></div> <div>下一æ?<a href="150.html">矛_®¶åº„é’¢¾l“构工程监理工作控制要点有哪些?</a></div> </p> <div class="tag">相关标签åQ?a 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