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污水提升泵站施工方案(上)

2019-12-07  來自: 衡水市衡美水處理設備有限公司 瀏覽次數:1738


如何進行水處理

衡美水處理為您介紹一種***、實用的水處理技術方案——污水提升泵站施工方案

污水提升

一、編制依據

(一)施工圖紙;

(二)工程勘察報告;

(三)《給水排水管道工程施工及驗收規范》

(四)《工業金屬管道工程施工及驗收規范》

(五)《混凝土結構工程施工質量驗收規范》

二、工程概況

(一)該污水提升泵站為地埋式泵站,設有2臺潛污泵,一用一備,單臺流量50m3/h,揚程H=12.5m

(二)工期要求:2個月(擬自2012215日至2012415日)。

(三)質量要求:合格。

(四)本工程基礎持力層選用②層粘土層,地基承載力特征值fak=220kpa

三、施工流程

準備工作→基坑開挖→基坑降水→墊層澆筑→泵房底板澆筑(至15.500高程,墻澆30cm,內置鋼板止水)→一次墻體澆筑(15.50018.000,鋼套管預埋)→土方填筑(至18.000)→水泵基礎及格柵基礎混凝土澆筑→二次墻體(18.00020.550,鋼套管預埋)及15cm梁板澆筑→土方填筑(至18.85)→出水控制間混凝土澆筑。

四、施工準備

(一)技術準備

1熟悉和審查施工圖紙;

2準備與本工程有關的規范、圖集;

3測量人員根據建設單位提供的水準高程及坐標位置,做好工程控制網樁的測量定位,同時做好定位樁的閉合復測工作,并做好標識加以保護。

(二)現場準備

設計范圍及泵站外地面高程進行場地平整。施工用水、用電參見勝利東路施工組織設計。

五、主要項目施工方法

(一)測量方案

1、編制依據

(1)施工圖紙及招標文件。

2)《工程測量規范》GB50026-2007

2、人員組織

測量放樣控制是貫穿工程施工全過程的關鍵的工作,為此項目部成立專門測量小組,根據工程各部位特點由專職測量隊員實施,并及時做好有關工程記錄。人員配備:測量員2人。

3、測量器具配備表污水提升污水提升

4、測量內容及要求

工程開工前根據業主或監理人提供的平面控制網點及水準網點,按照三角網及導線網測量的要求,建立供施工使用的平面控制網及采用四等水準測量建立的高程控制網。測量控制網報經監理人審核后,作為以后施工測量放線的依據。

5、控制樁布設

為防止差錯,作為施工過程中控制中心線樁及水準點等測量重要標點,***至少設置二組可供相互檢查核對,并作測量和檢查核對記錄,布置的控制樁均穩固可靠,并保留至工程結束。

(二)基坑施工

1、基坑開挖與回填

(1)基坑開挖

①本污水泵站的地址在園區公園的軟質駁岸的坡上,18.000以上都雜填土,先大開挖進行挖除后場地平整。由于基坑底高程14.700,先開挖到16.700高程設置一個平臺,可采用挖掘機一次開挖到設計高程,在坡中間設置1米寬平臺。

污水提升

②預留20cm保護層,再由人工進行修坡及開挖到設計高程,按照規范要求邊坡控制在10.67,中間設1m工作平臺。如果土質差,含水量高,開挖深,10.67邊坡滿足不了施工需要,調整坡比報監理確認后實施。

③開挖斷面形式

為了保證管道施工的方便和邊坡的穩定安全,在基坑上預留一工作平臺,平臺的寬度為1米。該段土質屬粘性土類,坡頂有土方運輸自卸車、管材運輸車等施工機械動載,開挖的放坡采用10.67

單式開挖斷面示意圖:

污水提升

說明:基坑底寬度 = c + 2a + 2b

a — 排水溝寬度40cm

b —工作面寬度 60cm

c —結構寬度5.7m

④開挖至設計高程后 由建設單位會同設計、勘察、施工、監理單位共同驗槽;若發現土質與勘察報告不符或有其它異常,由建設單位會同上述單位研究處理措施。

⑤槽底原狀地基土不得擾動,不得受水浸泡。

(2)土方填筑

①經檢驗合格,并經業主、監理、質監部門驗收后就可以回填基坑土方。回填前,混凝土強度應達到設計要求。

②回填土料應符合設計要求,泵站結構外圍1米內采用打夯機進行夯實。

③泵站周圍回填應對稱進行,不得漏夯,兩側高差不得超過30 CM

④回填土方時,如果基坑內有因降雨、地下滲水或施工用水造成的積水應先排除,并清除表面被水浸泡過的軟弱土層。

⑤填筑前要對土質、鋪土厚度、壓實機具進行綜合試驗,測定相關壓實參數,作為施工質量控制的依據。填筑過程中由***人員按試驗參數對回填土進行控制,并及時取樣試驗檢測,確保回填質量。

⑥回填土的含水量,按土類和采用的壓實機具控制在合理含水率±2%范圍內。如果回填所用的土料含水量過大,在報請監理同意后,在土料中加入適當的生石灰以改善土料的質量。

⑦嚴格控制鋪土厚度,不得超厚。人工夯實每層不超過20㎝,土塊粒徑不大于5㎝,機械壓實每層不超過30㎝,土塊粒徑不大于8㎝,每層壓實后經監理單位驗收合格后方可鋪筑上層土料。

⑧禁止坑壁取土回填。

(三)基坑降排水

基坑降水配合是確保基坑施工安全和基坑施工質量的重要措施之一。本工程擬采用地表明溝、平臺盲溝排水以及基坑底部積水坑相結合的做法,抽排基坑積水。

基坑底板施工降水,在底部沿外徑1200布設三個固定集水井,采用長0.6m、內徑φ300預制混凝土管筒(壁厚60)作濾水管,350QW15-15-2.2潛污水泵將水抽出基坑外排。此三個集水井配合降水至***基坑回填土前。基坑排水平面見下圖示:

污水提升

(四)鋼筋工程

1鋼筋的原材料控制

所有進場鋼筋***有合格證,現場試驗員、監理代表共同進行抽樣,并送試驗室檢驗合格后,方可用于工程,同時本工程中使用的焊接鋼筋也***有合格的試驗報告。表面有損傷、油漬、帶有顆粒片狀的銹紋鋼筋不得使用。

2鋼筋的制作

施工鋼筋的制作均在施工現場加工,加工完畢后,分類成捆,掛牌堆放,運至施工綁扎地點。

現場技術人員和***工長根據設計圖紙,繪出鋼筋加工圖、計算鋼筋加工長度、數量、填寫配料單,同時要對班組操作人員進行詳細的書面技術交底,工人在配料時施工管理人員要跟班作業。

鋼筋加工時,鋼筋的形狀正確,平面上沒有翹曲,不平現象,箍筋末端應做成135ο彎鉤,彎鉤的平直部分長度不應小于箍筋直徑的10倍。在鋼筋彎曲點處不得有裂紋。

鋼筋在制作過程中,應該先對焊后下料,這樣既可以保證加工鋼筋時的質量,又可以節約鋼材。

鋼筋彎曲成型后的允許偏差為全長:±10mm;彎曲鋼筋起彎點位移:±20mm;彎曲鋼筋的彎起高度:±5mm

鋼筋加工完畢后,要分類成捆堆放,每捆掛上牌號,注明鋼筋規格、數量、長度、使用部位等。綁扎時,便于取料,提高工效。 所有鋼筋,在地面制作,采用人工運至基坑。按圖紙及施工規范要求綁扎、安裝、成型。鋼筋搭接,應考慮澆筑混凝土的次數,鋼筋保護層按圖紙設計進行留置。保護層墊塊采用高標號水泥砂漿,按不同部位使用厚度預制;

3梁鋼筋綁扎

箍筋彎鉤的疊合處,在梁中應交錯綁扎,有抗震要求的結構,箍筋彎鉤為135ο。

搭接長度的末端與鋼筋彎曲處的距離,不得小于鋼筋直徑的10倍。接頭不宜位于構件彎矩處。受拉區域內Ⅰ級鋼筋綁扎接頭的末端應做彎鈞(Ⅱ、Ⅲ級鋼筋可不做彎鈞),搭接處應在中心和兩端扎牢。 焊接頭、閃光對焊位置應相互錯開,在受力鋼筋直徑35倍區段范圍內(且不小于500mm),有綁扎接頭的受力鋼筋截面面積占受力鋼筋總截面面積為受拉區不得超過25%,受壓區不得超過50%。 底板鋼筋按梅花形設置φ16@1000鋼筋馬凳,控制上、下排鋼筋的間距;墻筋設置φ10@600梅花形對拉筋,內外鋼筋墊塊間距不大于1.5m/只,并與內外鋼筋扎牢,以防混凝土澆搗過程中移位。

(五)模板工程

1泵房墻體分二部分安裝,前部:底板上30cm18.000m標高;第二部分:18.000m20.550m標高;

2泵房是圓形結構,采用18厚厚木膠板組拼,內鋪2厚的木皮,保證澆筑后的混凝土表面平整。按內、外直徑尺寸放樣加工,豎楞、橫楞均采用方木固定,鋼管腳手架配套使用支撐;M12@600梅花形對拉螺栓固定(中間焊接50×50止水片);

3模板安裝好后,***按要求進行校模,合格后方可進行下道工序的施工。

污水提升

(六)混凝土工程

1泵房底板、側壁、梁及平臺面板混凝土采用泵送入模,注意預埋套管周圍混凝土的密實;

2混凝土澆筑過程中,派專人負責看管模板和鋼筋,發現有漲模、位移等情況時及時處理,以保證混凝土的結構尺寸及外觀;

3泵房部分混凝土按模板分段(次)留置施工縫。施工縫采用凹式榫接,凹榫寬度200mm,深120mm,在澆筑混凝土前,施工縫表面要鑿除松動的混凝土和石子,清洗后均勻澆筑5cm厚與墻體混凝土配比的無石子砂漿,不得遺漏。在放置止水鋼板的施工縫,控制好混凝土澆筑高程,大于鋼板1/2高度,超過部分打毛清理干凈。

4底板混凝土采用插入式振動棒和平板振動器結合搗實,墻、梁混凝土采用插入式振動棒搗實。振動棒要快插慢拔,每次移動間距不大于振動棒作用半徑的1.5倍;平板振動器的移動間距,保證振動器的平板能夠覆蓋已振實部分的邊緣;

5每班(次)制作28d強度試塊及作為拆模依據的備用試塊。每次澆筑后,派專人對混凝土進行養護,根據不同的氣候采取相應的措施。

(七)腳手架工程

泵房底板混凝土完成后,開始搭設滿堂腳手架。采用φ50鋼管、扣件式結構,分多層搭設,層高控制在1.5m1.8m,腳手架與結構混凝土墻面間距約0.5m

(八)機電設備安裝工程

設備安裝施工在泵房土建工程主體完成后。各種預埋件、進、出水管道口等,在土建施工的同時完成。安裝前,復核土建施工的設備基礎尺寸,測定并標記安裝基準線及標高點。各種設備、線路安裝,***嚴格按照***現行相關規范標準施工。安裝完畢后,***行人工動作調試,然后進行自動化整體調試。調試運行正常后,交付甲方試運行一周,最后辦理竣工驗收移交。

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