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                                                                                                                                                                                                                                    常見問題

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                                                                                                                                                                                                                                    輕型木結構的劣勢

                                                                                                                                                                                                                                    作者:網站編輯 人氣:1334 發表時間:2014-5-25

                                                                                                                                                                                                                                    輕型木結構是利用均勻密布的小木構件來承受房屋平面和空間作用的受力體系,輕型木結構建筑的抗力由主要結構構件(木構架)和次要結構構件(面板)的組合而得到,木構架通常用規格或者工字型木柵欄組成,常用的面板有膠合板和定向刨花板, 穩定性方面:木材是天然材料,在生長過程中不免會產生種種天然缺陷,例如節子,腐朽,振裂和干裂,蟲眼,斜紋和扭曲等,此外,木材在加工過程中會產生加工缺陷,包括鈍棱,漏刨等。所有這些缺陷,都會影響到木材的強度。

                                                                                                                                                                                                                                    膠合板的污染問題

                                                                                                                                                                                                                                    應用方面的缺點:穩定性差,這是由于芯材材料的一致性差異,這使得細芯板變形可能增大,所以細芯板不適用于單面性的部位,如柜門。

                                                                                                                                                                                                                                    環保方面:膠合板主要用的都是甲醛脲醛三聚氨氰聚乙烯醇翔鉀基等化學污染很厲害的產品,對環境,對人體有嚴重的傷害,還有經過后面的熱壓工序都會放出放射性的輻射,國外歐美日等資本主義國家目前禁止生產膠合板,基本從中國進口。

                                                                                                                                                                                                                                    膠合板由于采用了膠,因此膠合板的甲醛釋放一直是人們關注的主要問題,目前還不存在完全不含有甲醛的膠合板,因此裝修后除甲醛就變得非常重要。

                                                                                                                                                                                                                                    甲醛為毒性較高的物質,在我國有毒化學品優先控制的化學品名單上甲醛高居第二位。甲醛已經被世界衛生組織確定為致癌和致畸形物質,是公認的變態反應源,也是潛在的強制突變物質之一。

                                                                                                                                                                                                                                    研究表明:甲醛具有強烈的致癌和促癌作用。大量文獻記載,甲醛對人體健康的影響主要表現在嗅覺異常、刺激、過敏功能下降、肺功能異常、肝功能異常和免疫功能異常的方面。長期接觸低劑量甲醛可引起慢性呼吸道疾病,引起鼻咽癌、結腸癌、腦瘤、月經紊亂、細胞核的基因突變,DNA單鏈內交鏈和DNA與蛋白質交鏈及抑制DNA損傷的修復;引起妊娠綜合征、新生兒染色體異常、白血;引起青少年記憶力和智力下降。在接觸的人群中,兒童和孕婦對甲醛尤為敏感,危害也更大。

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