擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)基(ji)(ji)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，灰土(tu)(tu)(tu)擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，環(huan)保擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，水(shui)泥(ni)土(tu)(tu)(tu)擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，素土(tu)(tu)(tu)擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，夯擴擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，沉管(guan)擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，強夯地基(ji)(ji)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，碎石擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，擠(ji)(ji)密(mi)(mi)螺紋樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，鉆孔灌注(zhu)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，軟土(tu)(tu)(tu)地基(ji)(ji)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，灰土(tu)(tu)(tu)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，我公司主營：擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)，擠(ji)(ji)密(mi)(mi)樁(zhuang)(zhuang)(zhuang)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程

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旋(xuan)挖灌(guan)注樁澆注水下混(hun)凝土(tu)要求

⑴對混凝土(tu)的技術要求

樁設計要求混凝土(tu)(tu)強度為C30，配比由商品混凝土(tu)(tu)供(gong)應商提供(gong)，粗骨料(liao)（碎(sui)石）粒徑不得大于25mm，坍落(luo)度180～220mm，采用普(pu)通硅酸鹽水泥，可(ke)適當摻(chan)加(jia)減水劑(ji)，摻(chan)量根據試驗確定。配制的混凝土(tu)(tu)應具有良(liang)好的工作性能。

⑵混凝土澆(jiao)注前由技術人員檢查混凝土塌落度并記錄(lu)。混凝土在運輸、澆(jiao)筑過程(cheng)中不能產生離析現象。

⑶導管內(nei)使用(yong)的隔水(shui)塞球膽(dan)大小要合(he)適，安裝(zhuang)要正，一(yi)般(ban)位(wei)于水(shui)面以上。灌注混凝(ning)土前孔(kong)口要蓋嚴(yan)，防止混凝(ning)土落入孔(kong)中污(wu)染(ran)泥漿。

⑷混凝(ning)土(tu)(tu)首灌(guan)量應灌(guan)至導(dao)管(guan)(guan)(guan)下口2m以上，保證首灌(guan)導(dao)管(guan)(guan)(guan)埋入(ru)混凝(ning)土(tu)(tu)為3m左(zuo)右。混凝(ning)土(tu)(tu)澆(jiao)注時，導(dao)管(guan)(guan)(guan)下口埋入(ru)混凝(ning)土(tu)(tu)的深度不(bu)小于(yu)2m，不(bu)大于(yu)6m，設專人及(ji)(ji)時測定，以便掌(zhang)握(wo)導(dao)管(guan)(guan)(guan)提升高度。每次拆卸(xie)導(dao)管(guan)(guan)(guan)，必須(xu)(xu)經(jing)過測量計(ji)算導(dao)管(guan)(guan)(guan)埋深，然后(hou)(hou)確定卸(xie)管(guan)(guan)(guan)長度，使混凝(ning)土(tu)(tu)處于(yu)流動狀(zhuang)態，并(bing)(bing)作好澆(jiao)注施工(gong)記(ji)錄(lu)。混凝(ning)土(tu)(tu)灌(guan)注必須(xu)(xu)連續(xu)進行，中間(jian)不(bu)得間(jian)斷。拆除后(hou)(hou)的導(dao)管(guan)(guan)(guan)放入(ru)架子中并(bing)(bing)及(ji)(ji)時清(qing)洗干(gan)凈。

擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)基施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，灰土擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，環保擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，水泥土擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，素土擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，夯(hang)擴擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，沉管擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，強夯(hang)地(di)基施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，碎(sui)(sui)(sui)石(shi)擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，擠(ji)(ji)(ji)(ji)密(mi)(mi)螺(luo)紋樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，10米碎(sui)(sui)(sui)石(shi)擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，鉆孔灌(guan)注樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，臨(lin)汾碎(sui)(sui)(sui)石(shi)擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，軟(ruan)土地(di)基施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，灰土樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，我公司主營：擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)，擠(ji)(ji)(ji)(ji)密(mi)(mi)樁(zhuang)工(gong)(gong)(gong)程

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水(shui)(shui)泥土粉噴樁法。粉噴樁與(yu)(yu)周(zhou)圍的土體形成復(fu)合地基，與(yu)(yu)土體結(jie)合緊(jin)密，承載能力(li)較(jiao)大(da)，其樁體上存在應力(li)集中現(xian)象，大(da)部分荷載由(you)樁體承擔，樁間土上的應力(li)相(xiang)應的減少(shao)，使(shi)復(fu)合地基承載力(li)較(jiao)原土層(ceng)有所提高(gao)，沉降量(liang)有所降低。采用該法加(jia)固軟土地基時，水(shui)(shui)泥粉具有較(jiao)大(da)的吸水(shui)(shui)，發(fa)熱和膨脹作用，對樁間土起塑料板(ban)材排(pai)水(shui)(shui)板(ban)到(dao)一定(ding)的加(jia)固作用，同樣提高(gao)復(fu)合地基的強度。

在(zai)利用水(shui)(shui)泥土粉(fen)噴樁加(jia)固(gu)(gu)軟土地(di)基時，需考慮各種因(yin)素(su)對(dui)加(jia)固(gu)(gu)強(qiang)度(du)的(de)影響(xiang):①要以(yi)水(shui)(shui)泥粉(fen)為(wei)加(jia)固(gu)(gu)料，其(qi)強(qiang)度(du);②攪拌時間(jian)(jian)為(wei)2min時就(jiu)可以(yi)達(da)到的(de)攪拌效果，若(ruo)攪拌時間(jian)(jian)太長，強(qiang)度(du)會(hui)有所降低(di)，若(ruo)攪拌的(de)時間(jian)(jian)未達(da)到2min時，強(qiang)度(du)會(hui)很低(di);③置換率越高(gao)，強(qiang)度(du)越高(gao)，而隨著(zhu)齡期(qi)的(de)增加(jia)，強(qiang)度(du)大致呈線塑(su)料排水(shui)(shui)板(ban)的(de)價格性(xing)增加(jia);④當(dang)含水(shui)(shui)量(liang)為(wei)某(mou)值時，樁體的(de)強(qiang)度(du)達(da)到，一般樁體的(de)需水(shui)(shui)量(liang)為(wei)4kg/m。

擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)基(ji)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，灰土(tu)擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，環保擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，水泥土(tu)擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，素土(tu)擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，夯擴擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，沉管擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，強(qiang)夯地基(ji)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，碎(sui)石(shi)擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，擠(ji)(ji)(ji)(ji)密螺紋樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，鉆孔(kong)灌(guan)注樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，軟土(tu)地基(ji)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，灰土(tu)樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，我公司主營：擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)，擠(ji)(ji)(ji)(ji)密樁(zhuang)(zhuang)工(gong)(gong)(gong)(gong)(gong)程

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1.強夯置換(huan)(huan)地基的(de)適(shi)用性和處理(li)效果(guo)要通過(guo)現(xian)場試驗確定。在(zai)進(jin)行強夯置換(huan)(huan)施(shi)工前，25米(mi)碎石(shi)擠密樁施(shi)工，應在(zai)施(shi)工現(xian)場有代(dai)表性的(de)場地選擇(ze)一個(ge)或幾(ji)個(ge)試驗區進(jin)行試夯或試驗性施(shi)工。每個(ge)實驗區的(de)面積不(bu)應小于20m×20m。

2.強夯(hang)地基用(yong)夯(hang)錘(chui)的(de)質(zhi)量應(ying)(ying)為(wei)10-60t，其底(di)部和形(xing)式(shi)應(ying)(ying)為(wei)網狀(zhuang)形(xing)，夯(hang)錘(chui)底(di)部的(de)面積應(ying)(ying)根據土壤的(de)性質(zhi)確定，夯(hang)錘(chui)底(di)部的(de)靜態(tai)接地壓力應(ying)(ying)為(wei)25-80kPa。敲擊(ji)能量高(gao)時點(dian)擊(ji)高(gao)值(zhi)(zhi)，夯(hang)擊(ji)能量低時點(dian)擊(ji)低值(zhi)(zhi)，細(xi)粒(li)土使用(yong)低值(zhi)(zhi)。錘(chui)頭底(di)面應(ying)(ying)對稱設置若干個從(cong)上(shang)至下貫通的(de)排氣孔，孔徑為(wei)300-400 mm。

3.基(ji)礎夯(hang)實應(ying)采(cai)用(yong)帶(dai)自動脫(tuo)鉤裝(zhuang)置的履帶(dai)吊(diao)，夯(hang)錘質(zhi)量不應(ying)超過起(qi)重(zhong)(zhong)機械的額定起(qi)重(zhong)(zhong)質(zhi)量。履帶(dai)吊(diao)應(ying)在吊(diao)臂末端設置輔助(zhu)龍門架或(huo)采(cai)取其(qi)他安全措施(shi)，防(fang)止起(qi)落錘在起(qi)升落錘時傾覆。

4.地質中常見的(de)問題是(shi)軟(ruan)土，處理軟(ruan)土常用的(de)方(fang)法是(shi)強夯(hang)(hang)。強夯(hang)(hang)置(zhi)換(huan)法對(dui)于適合(he)(he)強夯(hang)(hang)的(de)環境稍微寬松(song)一點，適合(he)(he)高飽和度的(de)淤泥(ni)，對(dui)地基(ji)的(de)變形控(kong)制不會太嚴格。在設計之前，不能省(sheng)略現場實驗，這(zhe)是(shi)為了對(dui)其性能有(you)一個大致的(de)把(ba)握。