擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)基施(shi)(shi)(shi)工(gong)(gong)，灰(hui)土(tu)擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，環保擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，水泥土(tu)擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，素土(tu)擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，夯(hang)(hang)擴擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，沉管擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，強夯(hang)(hang)地基施(shi)(shi)(shi)工(gong)(gong)，碎石擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，太原擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)基施(shi)(shi)(shi)工(gong)(gong)廠家，擠(ji)(ji)(ji)(ji)密(mi)(mi)螺紋樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，鉆(zhan)孔灌注樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，軟土(tu)地基施(shi)(shi)(shi)工(gong)(gong)，灰(hui)土(tu)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，我公司(si)主營：擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)工(gong)(gong)，擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)工(gong)(gong)程

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避免鉆孔灌注樁護(hu)筒底部孔壁坍塌措施

　1、質量問題及現象

　孔壁坍塌；鉆(zhan)機傾斜。

　2、原因分析

　1）護筒(tong)底部及周圍未用(yong)粘土回(hui)填或夯實(shi)不足，在鉆進過程中或灌(guan)注過程中泥漿(jiang)護筒(tong)底掏空。

　2）由于提供的地(di)質鉆探資料不祥(xiang)，使護(hu)筒底產處(chu)于淤(yu)泥或砂(sha)層少(shao)。

　3）護筒直(zhi)徑較小。

　4）地表水滲入護筒外圍填(tian)(tian)土中，造(zao)成填(tian)(tian)土松軟。

避免鉆孔(kong)灌(guan)注樁護筒底部(bu)孔(kong)壁坍塌措施

　3、預防措施

　1）護筒底部應回(hui)填至少(shao)50cm厚的(de)粘(zhan)土(tu)，當(dang)土(tu)質為砂(sha)性(xing)土(tu)時護筒周圍0.5-1.0m范圍內也應用粘(zhan)土(tu)回(hui)填并夯實。

　2）根據設計部門提供的地質資(zi)料，護筒底部應穿過淤泥和砂層。

　3）護筒直(zhi)徑應(ying)大(da)于設計孔徑20-30cm（有鉆(zhan)(zhan)桿的正反循環鉆(zhan)(zhan)）、30-40cm（無鉆(zhan)(zhan)桿的潛水電(dian)鉆(zhan)(zhan)或沖擊(ji)鉆(zhan)(zhan)）。

　4）護筒出漿孔處(chu)應用粘(zhan)土夯填，同時(shi)應保持(chi)出漿順(shun)利，周圍不得有積(ji)水，避免(mian)護筒周圍泥(ni)土流失，造成坍(tan)孔。

擠(ji)(ji)密(mi)(mi)樁(zhuang)基施(shi)(shi)工(gong)(gong)(gong)，灰土(tu)擠(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，環保擠(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，水泥(ni)土(tu)擠(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，太(tai)原擠(ji)(ji)密(mi)(mi)樁(zhuang)基施(shi)(shi)工(gong)(gong)(gong)隊，素土(tu)擠(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，夯擴(kuo)擠(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，沉管(guan)擠(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，強夯地基施(shi)(shi)工(gong)(gong)(gong)，碎石擠(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，擠(ji)(ji)密(mi)(mi)螺(luo)紋樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，鉆(zhan)孔灌(guan)注樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，軟土(tu)地基施(shi)(shi)工(gong)(gong)(gong)，灰土(tu)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，我公司主營：擠(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)工(gong)(gong)(gong)，擠(ji)(ji)密(mi)(mi)樁(zhuang)工(gong)(gong)(gong)程

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強夯施(shi)工現場(chang)監(jian)控要(yao)求有哪些？

強夯法用(yong)大噸位(10～40t)夯錘，反(fan)復起(qi)吊(diao)至高處(chu)(6～30m)使(shi)其(qi)自由下落，給(gei)地(di)基以沖擊和(he)振(zhen)動能量，將地(di)基土夯實的(de)地(di)基處(chu)理方法。

1、開夯(hang)前(qian)檢查錘重和落距，以確保(bao)的(de)單(dan)擊(ji)夯(hang)擊(ji)能量符(fu)合設計(ji)要(yao)求(qiu);

2、強(qiang)夯(hang)(hang)施(shi)工過(guo)程中，按照要求(qiu)記錄下每次(ci)夯(hang)(hang)擊(ji)時候(hou)夯(hang)(hang)錘(chui)重量，落距、夯(hang)(hang)點(dian)間距、填筑路基高度、夯(hang)(hang)擊(ji)面積、每坑的(de)夯(hang)(hang)擊(ji)點(dian)數，并用水(shui)準儀檢測(ce)并記錄每錘(chui)夯(hang)(hang)擊(ji)沉降量。每批(pi)夯(hang)(hang)擊(ji)完成后，測(ce)量場(chang)地的(de)夯(hang)(hang)沉量并做好記錄。

3、在每遍夯(hang)擊前(qian)，對夯(hang)點放線進行復核，夯(hang)完后檢查夯(hang)坑位置，發現偏差或漏夯(hang)應及時糾正(zheng);

4、施工(gong)期間應(ying)對高填方路基邊坡的穩定性進行動態監(jian)測，如遇險(xian)情(qing)，則應(ying)立即(ji)停(ting)止(zhi)施工(gong)，另行采(cai)取相(xiang)應(ying)措施處理(li)。

施(shi)工觀(guan)測(ce)(ce)(ce)位(wei)移樁埋設于路肩下的(de)路基(ji)頂面(mian)及路堤(di)平(ping)臺和路堤(di)坡腳外1米位(wei)置，每隔50米布置，施(shi)工觀(guan)測(ce)(ce)(ce)頻率(lv)：一般情況，每10天觀(guan)測(ce)(ce)(ce)一次，要求雨后1-5天，每天觀(guan)測(ce)(ce)(ce)一次。變(bian)形觀(guan)測(ce)(ce)(ce)包(bao)括水平(ping)位(wei)移觀(guan)測(ce)(ce)(ce)及高(gao)程觀(guan)測(ce)(ce)(ce)，使用全站儀進(jin)行觀(guan)測(ce)(ce)(ce)。

擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)基施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，灰(hui)土(tu)擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，環保擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，水泥土(tu)擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，素土(tu)擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，夯擴擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，沉管擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，強夯地(di)基施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，碎石擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，太原擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)基施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)工(gong)(gong)(gong)程(cheng)，擠(ji)(ji)密(mi)(mi)(mi)(mi)螺紋樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，鉆孔(kong)灌注(zhu)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，軟(ruan)土(tu)地(di)基施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，灰(hui)土(tu)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，我(wo)公司主營：擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，擠(ji)(ji)密(mi)(mi)(mi)(mi)樁(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)工(gong)(gong)(gong)程(cheng)

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造(zao)成原因(yin)和處理方法有以(yi)下幾點：

檢查不夠認真，清(qing)孔(kong)不干凈或未(wei)進(jin)行二次清(qing)孔(kong)，是(shi)造成樁底沉渣(zha)量過多的首要原因。

清(qing)孔(kong)的主(zhu)要(yao)目的是清(qing)除(chu)孔(kong)底(di)沉(chen)(chen)渣，而(er)孔(kong)底(di)沉(chen)(chen)渣則是影(ying)響灌(guan)注樁(zhuang)(zhuang)承載能力的主(zhu)要(yao)因素(su)之(zhi)一。灌(guan)注樁(zhuang)(zhuang)成(cheng)孔(kong)至設計標高(gao)，應充分利(li)用(yong)鉆(zhan)桿在(zai)原(yuan)位進(jin)行次(ci)清(qing)孔(kong)，直到孔(kong)口返漿比重(zhong)持續小于(yu)1.10-1.20，測(ce)得孔(kong)底(di)沉(chen)(chen)渣厚度小于(yu)50mm，即抓緊(jin)吊放(fang)(fang)鋼筋(jin)(jin)籠(long)和沉(chen)(chen)放(fang)(fang)混(hun)凝土導(dao)(dao)管。由于(yu)孔(kong)內(nei)原(yuan)土泥漿在(zai)吊放(fang)(fang)鋼筋(jin)(jin)籠(long)和沉(chen)(chen)放(fang)(fang)導(dao)(dao)管這(zhe)段時間內(nei)使(shi)處(chu)于(yu)懸浮狀態的沉(chen)(chen)渣再(zai)次(ci)沉(chen)(chen)到樁(zhuang)(zhuang)孔(kong)底(di)部而(er)成(cheng)為性(xing)沉(chen)(chen)渣，從(cong)而(er)影(ying)響樁(zhuang)(zhuang)基(ji)工程(cheng)的質量。因此，必須在(zai)混(hun)凝土灌(guan)注前(qian)利(li)用(yong)導(dao)(dao)管進(jin)行第二次(ci)清(qing)孔(kong)。

泥(ni)漿比重過(guo)小或泥(ni)漿注入量不(bu)足而難于(yu)將(jiang)沉渣浮(fu)起(qi)，從而造(zao)成(cheng)樁底沉渣量過(guo)多。這就要(yao)求在(zai)成(cheng)孔后(hou)，鉆(zhan)頭提(ti)高孔底250px-500px，保持慢速空(kong)轉(zhuan)，維持循環(huan)清孔時間不(bu)少于(yu)30分鐘(zhong)。采用性能較好的(de)泥(ni)漿，控制泥(ni)漿的(de)比重和粘(zhan)度(du)，太原擠密樁基施(shi)工，不(bu)要(yao)用清水進行置(zhi)換(huan)。

鋼(gang)筋(jin)(jin)籠吊(diao)放(fang)(fang)過程(cheng)中(zhong)，未(wei)對準孔位而碰撞(zhuang)孔壁使泥土坍落樁(zhuang)底，造成樁(zhuang)底沉渣。因此，在鋼(gang)筋(jin)(jin)籠吊(diao)放(fang)(fang)時，要使鋼(gang)筋(jin)(jin)籠的(de)中(zhong)心與樁(zhuang)中(zhong)心保持一(yi)致，避免碰撞(zhuang)孔壁。可采(cai)用鋼(gang)筋(jin)(jin)籠冷(leng)壓接(jie)(jie)頭工藝加(jia)快對接(jie)(jie)鋼(gang)筋(jin)(jin)籠速(su)度，減(jian)(jian)少空(kong)孔時間，從而減(jian)(jian)少沉渣