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    斜坡雙線壓板穿孔錨固橡膠壩施工工藝
    RSS 打印 復制鏈接 發布時間:2017-05-17 08:58:26

     斜坡雙線壓板穿孔錨固橡膠壩施工工藝

           摘要:橡膠壩是一種隨著高分子合成纖維和橡膠工業的發展而出現的新型低水頭建筑物。它以高強力合成纖維為骨架,內外涂敷橡膠為保護層,制成橡膠布壩袋,并按要求的尺寸錨固于底板上成封閉狀,用水(氣)充脹形成的袋式當水壩,其運用條件與水閘相似,近幾年在我國廣泛用于防洪、灌溉、發電、供水、航運、擋潮等工程中。本文介紹了斜坡雙線壓板穿孔錨固橡膠壩施工工藝。

      關鍵詞:錨固槽、壓板、錨固安裝

      一、橡膠壩錨固形式

      壩袋錨固有三種型式,一種為混凝土楔塊擠壓式錨固,第二種為螺栓壓板式錨固,第三種為膠囊充水錨固。第二種設計數據準確、壩體受力均勻、安全性能高、施工簡單、維修方便、壩袋更換時快捷,因而近幾年所建的橡膠壩錨固多采用雙線螺栓壓板型式。

      二、斜坡雙線壓板穿孔錨固槽施工

      螺栓壓板式穿孔錨固的錨固構件由螺栓和壓板組成。穿孔錨固是在錨固部位將壩袋穿孔套進預埋的地腳螺栓,用壓板錨緊。

      1、預埋螺栓及錨固槽模板安裝

      為確保錨固槽與底板整體性,采用錨固槽隨底板混凝土一次澆筑成型工藝。預埋螺栓與錨固槽模板一起安裝。錨固槽模板采用定型木模板,模板加工成左右兩部分,預埋的螺栓從錨固槽模板中間穿過。具體工藝:底板鋼筋綁扎成型后,用高精度經緯儀找出錨固槽中心線;用水準儀定出錨固槽高程及測定螺栓高度;在錨固槽兩側和底面部位,用鋼筋焊成獨立三腳支撐體系,每隔一定距離設置一道,在模板連接處兩側必須設置,底面鋼筋嚴格用水準儀進行找平,模板兩側鋼筋不能直接接觸模板面,距離模板面10~15cm;預埋的螺體和下壓板放在三腳體系上進行安裝固定,再將制作好的木模板,平放在下壓板之上;之后再次用水準儀和經緯儀進行精確找平和校正;最后加固于用鋼筋焊成的獨立支撐上:模板兩側用帶彎鉤的鋼筋固定,以防拆模后刺破壩袋和底墊片,

      模板上面每隔一定距離設鋼筋橫向壓條,并用鉛絲與底部鋼筋相連固定,防止模板上浮;當澆筑將至設計高程時,把鉛絲剪斷,拆除鋼筋壓條。

      模板支好后澆筑混凝土。澆筑時嚴格控制錨固槽模板兩側下料均勻;使錨固槽周圍混凝土均勻上升,入倉方法宜采用人工用鐵鍬下料;模板底部振搗宜用30小振動棒進行振搗,以防震動力量過大,引起模板上浮及預埋件產生位移;

      注意事項:①要事先做好錨固槽模板,并在運輸和安裝錨固槽模板時,應注意輕抬輕放,避免損壞模板;②安裝時確保測量精度,尤其確保中心線誤差在允許范圍內。③錨固槽模板與底板鋼筋及其它模板的支撐要分開,避免澆筑砼時,產生位移。④為使螺栓中心線成一直線,在螺栓下部位置用一根鋼筋將所有的螺栓焊接在一起,使螺栓牢固不動。

      三、斜坡雙線壓板穿孔錨固壩袋安裝

      采用斜坡式螺栓壓板雙錨線穿孔錨固的橡膠壩。其錨固構件由螺栓和壓板組成,穿孔錨固是在錨固部位將壩袋穿孔套進預埋的地腳螺栓,用壓板錨緊。穿孔錨固的優點:壩袋布和錨件所需長度較短,約為不穿孔錨固長度的一半;施工安裝和拆卸檢修方便。缺點是錨固部位要穿孔,在孔的周邊要補強,以防應力集中將壩袋撕裂;穿孔錨固是靠螺栓和鋼壓板錨緊,其構件在污水河道中使用,容易銹蝕而失效。

      壓板螺栓錨固壩袋是較為先進的安裝方式,其特點是設計數據準確、壩體受力均勻、施工簡單、維修方便。

      一般壓板設計為凹凸結構,即上壓板本體和設置于該本體上的錨固孔,上壓板本體的兩面形狀與橡膠壩袋錨固件下壓板的工作面對應且為壓制成型,其兩個端部為相對應的凹凸結構。橡膠壩袋錨固件上壓板具有結構簡單、形狀規范、加工精度高和重量輕的優點。

      壩袋安裝工藝流程:

      安裝準備底墊片止水海綿壩袋墊平片、加強片上壓板螺母緊固上黃油、套薄膜砂漿覆蓋

      1、安裝準備

      安裝準備首先要對基礎底板及側墻混凝土的強度進行檢查,必須達到設計要求;

      用角磨機對錨固槽內側棱角進行磨光,并對錨固槽進行詳細檢查,確保槽內光滑無雜物。對壩袋底板及兩側岸坡進行檢查清理,確保平整、光滑無雜物;檢查充排水管路是否暢通,確保管道內無雜物;

      壩袋、底墊片應出廠前檢查其尺寸并畫出錨固線和錨固中心線;在醒目位置標出上下游標志。

      壩袋和底墊片運至工地后,用吊車配合人工卸車,放于壩底板上時,一定注意上下游方向不要放錯,要保護好,不能損壞壩袋。

      壩袋運抵施工現場,應對有關參數檢驗報告進行檢查,核實壩袋質量,若有損傷及時修補或更換。

      注意檢查壩袋、底墊片厚度是否符合設計要求;

      2、安裝

      (1)用經緯儀在底板上分別標出壩軸線、中心線。

      (2)底墊片就位:用人工將底墊片鋪開;在底墊片上標出中心線和錨固線;將底墊片中心與底板中心對齊,均勻鋪平展開。

      (3)派專人對底墊片進行詳細檢查,發現因質量、裝運等原因造成的空洞、破損,及時進行修補以防滲漏。

      (4)在伸入壩袋內的充排水管、測壓管和超壓溢流管等管口四周的底墊片上,粘一層橡膠片作補強。

      (5)在底墊片上畫出水帽、測壓管和超壓溢流管位置,復測無誤后在各管口處挖孔并固定。

      (6)底墊片鋪平后,找出錨固螺栓的具體位置,并用粉筆做出“十”字標記。把螺栓放在十字標記上,用手錘直接擊打底墊片,從而使螺栓穿過底墊片。

      (7)底墊片安裝好后,安裝止水海綿,在止水海綿上下層分別放置一道遇水膨脹止水膠條,這樣止水效果明顯。遇水膨脹止水膠條纏繞在螺栓上,止水海綿同樣打孔粘在底墊片相應位置上。

      (8)壩袋就位:用人工配合鐵鉤、鐵鉗等工具將壩袋展開鋪平,并對壩袋進行左右移動,直至壩袋中心線和錨固線與基礎底板及底墊片上的對應線重合。在壩袋左右兩側用繩索固定于岸坡上,防止岸坡壩袋未安裝時就產生下滑。

      (9)壩袋錨固順序,先下游后上游,自中間向兩側,最后岸坡;錨固兩側岸坡時,將壩袋掛起撐平,從下部向上部錨固。

      (10)橡膠壩袋安裝:用粉筆劃出壩袋上下游及岸坡錨固線。一般由壩袋邊線向里測量出一定距離為螺栓錨固位置,并用粉筆做出十字標記。用手持式打孔機在十字標記上打孔。將螺栓全部穿過壩袋上螺栓孔。

     (11)用手持式打孔機在墊平片上打孔,然后在適宜位置安放墊平片。

      (12)在放上壓板之前,為了保護壩袋及墊平片不被上壓板劃破,再放一層加強片。

      (13)上螺絲帽,首先,在每個螺栓上放一個螺帽,擰緊后,再放上第二個螺帽,并多次擰緊。擰螺帽時采用鋼管自制的“丁”字擰絲器。這樣即省力、螺帽上的又緊。

      (14)在露出的錨固螺栓頭上,用黃油抹均,并用塑料袋保護好,以防以后檢修時螺絲不生銹。

      (15)上下游錨固完后,安裝兩側岸坡,一定注意壩袋要掛起撐平、理順、墊平,不得用剪口補強處理。并從下部向上部錨固。工藝同上。

      (16)錨固完畢,做充水試驗。

      (17)進行二次錨固:壩袋沖水后,個別螺赗會有松動,要再次擰緊螺帽,對其進行加強錨固。

      (18)驗收合格后,錨固槽用設計標號的水泥砂漿找平。

      五、結束語

      本人參加工作以來共參建了承德武烈河、石家莊民心河工程、保定大水系環堤河等十幾座橡膠壩的施工,以上工藝是本人多年的橡膠壩施工經驗,對斜坡雙線壓板橡膠壩穿孔錨固的一個總結,以供橡膠壩施工技術人員借鑒和交流。

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