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    屋面防水卷材的施工要點及細部處理
    RSS 打印 復制鏈接 發布時間:2013-12-16 08:37:09

     1、         屋面防水卷材的施工分析

    屋面工程施工前,施工單位應組織技術管理人員會審屋面工程圖紙,掌握施工圖中的細部構造及有關技術要求并根據工程的實際情況編制屋面工程的施工方案或技術措施。這樣避免施工后留下缺陷,造成返工,同時工程依據施工組織有計劃地展開施工,防止工作遺漏、錯亂、顛倒影響工程質量。有了施工組織,下一步施工負責人應向班組進行技術交底。內容包括:施工的部位、施工順序、施工工藝、構造層次、節點設防方法、增強部位及做法,工程質量標準,保證質量的技術措施,成品的保護措施和安全注意事項。屋面防水卷材工程設計原則:

    1.1以防為主,放排結合

    排水是屋面防水的一個重要內容,對于平屋頂,應以防為主,但應盡快將水排走,減輕防水層的負擔,避免屋面較長時間積水。這就要求設計屋面及天溝的排水坡度和排水路線、排水管的管徑及數量。

    1.2按級設防,滿足設防要求

    屋面防水工程應根據建筑物的性質、重要程度、使用功能要求以及防水層的耐用年限等,選用不同的屋面防水卷材和不同的構造層次,以滿足設防要求,保證防水可靠。

    1.3適當考察施工因素

    屋面防水卷材的質量取決于材料、設計、施工等諸因素,而其中施工因素的影響最大。尤其是現在,我國防水施工讓以手工操作為主,操作人員的技術水平、心理素質以及工藝的繁雜難易程度均會對施工質量造成相當大的影響。因此,一個好的設計,必須適當考慮施工因素,盡量采用簡單的構造,選用施工方便的材料或提到設防能力,提高防水安全儲備,彌補施工可能產生的缺陷。

    1.4屋面找平層的要求

    找平層是鋪貼卷材防水層的基層,給防水卷材提供一個平整、密實、有強度、能粘結的構造基礎。因此,鋪貼卷材的找平層應堅實,不得有突出的尖角和凹坑或表面起砂現象,當用2米長的直尺檢查時,直尺與找平層表面的空隙不應超過5mm,空隙只允許平緩變化,且每米長度內不得超過一處。找平層相鄰表面構成的轉角處,應做成圓弧或鈍角。當基層為整體混凝土時,采用水泥砂漿找平層,厚度為20mm,水泥與砂漿比為1:2.5~1:3(體積比),水泥標號不低于42.5。找平層還要設分格縫,并嵌填密封材料,這樣可避免或減少找平層開裂,以至于當結構變形或溫差變形時,防水層不會形成裂縫,導致造成滲漏。縫寬為20mm,分格縫的縱向和橫向間距不大于6m,分格縫的位置設在屋面板的支端,屋面轉角處防水層與突出屋面構件的交接處,防水層與女兒墻交接處等,且應與板端縫對齊,均勻順直。水泥砂漿找平層施工時,先把屋面樓板雜物清理干凈并灑水濕潤。在鋪設砂漿時,按由遠到近,由高到低的程序進行,每分格內一次連續鋪成,按設計控制好坡度,用2m以上長度刮桿刮平,待砂漿稍收水后,用抹子壓實抹平12小時后用草袋覆蓋,澆水養護。對于突出屋面上的結構和管道根部等細部節點應做圓弧、圓錐臺或方錐臺并且用細石混凝土制成,以避免節點部位卷材鋪貼折裂,利于粘實粘牢。

    2、        屋面防水卷材的施工要點

    首先,施工的環境要求是非常重要的。為了保證施工操作以及卷材鋪貼的質量,宜在+50℃~+350℃氣溫下施工;高聚物改性瀝青以及高分子防水卷材不宜在負溫以下施工,熱熔法鋪貼卷材可以在-100℃以上的氣溫條件下施工,這種卷材耐低溫,在負溫下不易被凍壞。雨雪霜霧或大氣濕度過大,以及大風天氣均不宜露天作業,否則應采取相應的技術措施。其次,就是對屋面排水坡度的要求。平屋面的排水坡度為2%~3%,當坡度小于等于2%時,宜選用材料找坡;當坡度大于3%時,宜選用結構找坡。天溝、檐溝的縱向坡度不應小于1%,溝底落差不得超過200mm。水落口周圍直徑500mm范圍內坡度不應小于5%。最后,對屋面基層空隙、裂縫的處理。基層是預制混凝土板的,當板與板之間的縫隙寬度小于20mm時采用細石混凝土灌縫,石子粒徑不得大于10mm,其強度等級不應小于C20并盡可能使用膨脹水泥或摻膨脹劑攪拌的混凝土進行灌縫;當板與板之間的縫隙寬度大于40mm時板縫內應設1Φ6鋼筋或按設計要求配置的鋼筋,澆筑完板縫混凝土后應及時覆蓋并澆水養護7天,混凝土強度等級達到C15時,方可繼續施工。防止灌縫混凝土過早承受施工荷載的影響,確保板間的粘貼強度。基層是現澆鋼筋混凝土時,當板內存在有裂縫,應先用鑿子把裂縫鑿成15~20mm寬,深倒八字形的槽溝,然后把石渣清走,把溝槽吹干凈,用填縫膏分二至三次填滿裂縫,每次間隔時間必須有15分鐘之久,填滿裂縫后用滾筒壓平既可。找平層是鋪貼卷材防水層的基層,給防水卷材提供一個平整、密實、有強度、能粘結的構造基礎。因此,鋪貼卷材的找平層應堅實,不得有突出的尖角和凹坑或表面起砂現象,當用2米長的直尺檢查時,直尺與找平層表面的空隙不應超過5mm,空隙只允許平緩變化,且每米長度內不得超過一處。找平層相鄰表面構成的轉角處,應做成圓弧或鈍角。當基層為整體混凝土時,采用水泥砂漿找平層,厚度為20mm,水泥與砂漿比為1:2.5~1:3(體積比),水泥標號不低于42.5。找平層還要設分格縫,并嵌填密封材料,這樣可避免或減少找平層開裂,以至于當結構變形或溫差變形時,防水層不會形成裂縫,導致造成滲漏。在鋪設砂漿時,按由遠到近,由高到低的程序進行,每分格內一次連續鋪成,按設計控制好坡度,用2m以上長度刮桿刮平,待砂漿稍收水后,用抹子壓實抹平12小時后用草袋覆蓋,澆水養護。對于突出屋面上的結構和管道根部等細部節點應做圓弧、圓錐臺或方錐臺并且用細石混凝土制成,以避免節點部位卷材鋪貼折裂,利于粘實粘牢。

    3、        屋面防水卷材的細部處理

    屋面滲漏是建筑工程中的一項主要質量通病,直接影響建筑物的使用功能和壽命,也會給用戶生活、生產帶來嚴重不便。屋面滲漏原因是多方面的,主要有設計、施工、防水材料以及使用中維護不當等因素。因此,屋面防水是一項系統工程,必須采取綜合治理措施,才能從根本上解決其滲漏問題。據目前調查,出現屋面滲漏的原因中施工方面主要到50%以上,而細部節點的處理又是屋面防水施工的關鍵部位。現將常見的卷材防水施工細部節點處理簡述如下:

    3.1鋼筋混凝土預制屋面板板縫

    處理預制屋面板板縫(尤其是板端縫)處是防水的薄弱環節,易出現滲漏。在施工中認真做好該部位的處理。在板縫灌縫之前應將板縫內的雜物清掃干凈并灑水充分濕潤,但不得有積水。然后在板縫兩側刷素水泥漿(水灰比不大于0.4)一道,再用不低于C20細石混凝土灌縫至離板面25mm的位置,待縫內混凝土達到一定強度后,用油膏嵌縫至板面。

    3.2屋面變形縫

    根據建筑結構類型的長度、高度及抗震設防等特征,設置變形縫。變形縫可分為伸縮縫、沉降縫和抗震縫。其處理方法應該根據其具體情況來進行。

    3.3管道出屋面節點處理

    由于屋面上有較多管道穿過,這些部位若處理不當最易產生滲漏,因此,必須做好此處的防水處理。當管道穿過結構層處,其周圍應用不小于C20細石混凝土灌縫至離板面25mm位置,待縫內混凝土達到一定強度后,用油膏嵌縫至板面一平。當屋面上找平層施工時,在管根部應用C20細石混凝土做成圓弧形(采用瀝青防水卷材R≥150mm,高聚物改性瀝青卷材時R≥50mm,合成高分子防水卷材R≥20mm)。防水層施工前該處應先做一道附加防水層,再做防水層。

    4、         結束語

    做好屋面卷材防水層并不是一件很困難的事情,只有我們按照屋面卷材防水工序施工,層層落實,嚴格把關,認真按規范做好每步工作,就可以杜絕施工造成的屋面漏水。

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