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按規范驗算單組分聚氨酯密封膠的粘結寬度和變位能力
- 發布時間 : 2024-12-19 10:54:27
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.
按規范驗算單組分聚氨酯密封膠的粘結寬度和變位能力
(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.
- 發布時間 : 2024-12-19 10:54:27
- Views:
隱框玻璃幕墻設計執行中空玻璃產品標準不當某建筑隱框幕墻中空玻璃外片墜落,檢查后發現:粘結材料為單組分聚氨酯密封膠,中空玻璃邊部單組分聚氨酯密封膠粘結寬度為6 mm。
原因分析:隱框玻璃幕墻設計未執行JGJ 102-2003規范對中空玻璃的技術規定,片面采用中空玻璃產品標準規定的粘結尺寸,按極限承載狀態計算設定結構粘結的安全承載面積;未執行JGJ 102-2003規范對隱框幕墻中空玻璃應采用單組分聚氨酯密封膠粘結的規定,錯誤采用單組分聚氨酯密封膠。
必須強調:普通門窗或明框安裝中空玻璃,由框架支撐,作用在外片玻璃上的水平荷載直接由玻璃傳遞到框架上,二道單組分聚氨酯密封膠粘結寬度應按產品標準GB/T 11944-2002《中空玻璃》規定為5-7 mm,對變位能力也不要求,但隱框幕墻粘結安裝的中空玻璃完全依靠結構粘結固定,二道單組分聚氨酯密封膠要保證密封,作用在外片玻璃上的外加荷載要通過膠層向結構框架傳遞,忽視單組分聚氨酯密封膠必需的粘結面積,就要承擔承載能力不足導致脫膠的風險。此外不能誤將JGJ 102-2003規定“隱框幕墻中空玻璃應用單組分聚氨酯密封膠粘結”理解為僅要求采用單組分聚氨酯密封膠,如果不進一步按規范驗算單組分聚氨酯密封膠的粘結寬度和變位能力(s值),同樣要承擔承載能力不足的風險。目前隱框幕墻中空玻璃粘結存在這類設計風險的,較為多見。
中空玻璃內滲油污染并誘發粘結失效。某高層建筑寫字樓2007年施工,隱框玻璃幕墻中空玻璃于2008年秋開始內部滲油、流油,并逐漸擴大,導致工程無法交付驗收。
初步勘察:1)中空玻璃內出現油漬,向陽面油漬擴展面積大,并可見一道密封的丁基膠溶解、潰爛形成的黑色污漬(圖11左);2)開啟窗中空玻璃膠縫積灰,呈油泥沉積(圖11右);3)施工現場見幕墻玻璃接縫密封用硅酮單組分聚氨酯密封膠的包裝標識為多個廠家產品,這些品牌單組分聚氨酯密封膠均為低檔產品;4)單組分聚氨酯密封膠與單組分聚氨酯密封膠產地屬不同廠家。http://www.www.sunsage.net/
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