木樓梯(ti)

因(yin)不能防(fang)火，應用(yong)(yong)范圍受到(dao)限制。有暗步(bu)式(shi)和明(ming)步(bu)式(shi)兩種(zhong)。踏步(bu)鑲(xiang)嵌(qian)于(yu)樓(lou)(lou)梯(ti)(ti)(ti)斜梁(liang)(又稱樓(lou)(lou)梯(ti)(ti)(ti)幫(bang))凹槽內的(de)為(wei)暗步(bu)式(shi);釘于(yu)斜梁(liang)三角(jiao)木(mu)上的(de)為(wei)明(ming)步(bu)式(shi)。木(mu)樓(lou)(lou)梯(ti)(ti)(ti)表面用(yong)(yong)涂料(liao)防(fang)腐。