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隱框幕墻中空玻璃粘結(jié)應(yīng)采用丁基防水嵌縫膠

  • 發(fā)布時(shí)間 : 2024-12-19 10:48:39
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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.

隱框幕墻中空玻璃粘結(jié)應(yīng)采用丁基防水嵌縫膠

(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(fā)布時(shí)間 : 2024-12-19 10:48:39
  • Views:
Information

       詢問及現(xiàn)場勘察發(fā)現(xiàn):1)玻璃是在一次大風(fēng)中墜落的,開啟窗上中空玻璃的內(nèi)片玻璃尚存;2)整片玻璃由15層墜落在2層平臺(tái)上,未傷人,僅2層外窗鋼制護(hù)欄被砸變形;3)觀測玻璃碎片,可見丁基防水嵌縫膠沿原始粘結(jié)寬度5 mm全部脫粘,僅存無承載能力的丁基防水嵌縫膠殘層(圖9左);4)觀察建筑物幕墻的其他中空玻璃,可見粘結(jié)尺寸相同并發(fā)現(xiàn)有局部脫膠跡象。

       開啟窗中空玻璃的外片玻璃墜落原因分析:

       1)JGJ102-2003規(guī)定隱框幕墻中空玻璃粘結(jié)應(yīng)采用丁基防水嵌縫膠,粘結(jié)尺寸按極限承載狀態(tài)設(shè)計(jì),粘結(jié)寬度C5應(yīng)按給定條件的計(jì)算結(jié)果取值。經(jīng)核算,該建筑幕墻在無支撐狀態(tài)玻璃自重荷載作用下,丁基防水嵌縫膠粘結(jié)寬度CS應(yīng)大于9.4  mm;在風(fēng)荷載作用下粘結(jié)寬度CS至少應(yīng)取10.5 mm。而該幕墻玻璃粘結(jié)寬度僅5 mm,比計(jì)算的安全取值少了一半,所以粘結(jié)節(jié)點(diǎn)承載能力嚴(yán)重不足是玻璃墜落的主因。

       2)該幕墻中空玻璃丁基防水嵌縫膠粘結(jié)厚度為6 mm,當(dāng)玻璃溫差位移時(shí),為保證丁基防水嵌縫膠伸縮變形不產(chǎn)生大于強(qiáng)度設(shè)計(jì)值的應(yīng)力,選用的丁基防水嵌縫膠變位能力(6值)必須適度。該建筑幕墻缺失丁基防水嵌縫膠選材的關(guān)鍵技術(shù)參數(shù)。經(jīng)驗(yàn)算,北京地區(qū)玻璃表面一1570℃溫差變化條件下,該幕墻必須選用變位能力大于4%的丁基防水嵌縫膠。

       3)該建筑幕墻已有因密封失效水蒸氣進(jìn)入中空玻璃內(nèi)部的記錄,濕汽對(duì)粘結(jié)界面的侵蝕可直接誘發(fā)玻璃脫膠墜落。

       4)該開啟窗密封粘結(jié)中空玻璃的丁基防水嵌縫膠外露,已使用12年,長期受外部雨淋、光照等環(huán)境的侵蝕,丁基防水嵌縫膠的性能及承載能力劣化。http://www.www.sunsage.net/

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