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擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)基施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),灰土擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),環保擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),水泥土擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),素土擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),夯擴擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),沉(chen)管擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),強夯地基施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),碎(sui)石擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)螺紋(wen)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),鉆孔灌注樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),軟(ruan)土地基施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),灰土樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),我公司主營:擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)施(shi)(shi)(shi)(shi)(shi)工(gong)(gong),擠(ji)(ji)(ji)密(mi)(mi)(mi)(mi)(mi)樁(zhuang)工(gong)(gong)程(cheng)
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基礎(chu)質(zhi)量的(de)好壞,對(dui)房屋的(de)安全作(zuo)用(yong)和(he)耐久性影(ying)響(xiang)(xiang)甚大,是(shi)施(shi)工(gong)(gong)質(zhi)量的(de)關(guan)鍵,所以施(shi)工(gong)(gong)中要十分注意。其中,影(ying)響(xiang)(xiang)基礎(chu)工(gong)(gong)程質(zhi)量的(de)因素有許多(duo),施(shi)工(gong)(gong)中也會遇(yu)到好多(duo)新的(de)問題。
質量通病
通病一:土(灰(hui)土)樁不密實、斷裂
現象:樁孔回填不均勻(yun),夯擊(ji)不密實(shi),密松(song)不一(yi),樁身(shen)疏(shu)松(song)甚至(zhi)斷(duan)裂(lie)。
措施:填夯過程中,嚴格控(kong)制夯實(shi)質(zhi)量,若(ruo)夯擊次數不夠(gou)應適(shi)當增加夯擊數。若(ruo)遇孔壁塌(ta)方(fang),應停止夯填,先將塌(ta)方(fang)清除,然后用C10混凝土灌入塌(ta)方(fang)處,再繼(ji)續(xu)回填夯實(shi)。
通病(bing)二:碎石擠密樁樁身縮頸
現(xian)象(xiang):形成(cheng)的(de)碎石擠密樁樁身局(ju)部直徑小于(yu)設計(ji)要求,一般在地下水位以下或飽(bao)和的(de)粘(zhan)性土中容易發生(sheng)。
措施:
(1)拔(ba)管速(su)度一般控制在0.8~1.5m/min(根據地(di)(di)區、地(di)(di)質不同選擇(ze)拔(ba)管速(su)度)。每拔(ba)0.5~1.0m停止拔(ba)管,原地(di)(di)振動(dong)10~30s。反復進行,直到拔(ba)出地(di)(di)面。
(2)采用反(fan)插法克服(fu)縮(suo)頸。局部(bu)(bu)反(fan)插法:在發生(sheng)部(bu)(bu)位(wei)進行反(fan)插,并(bing)往下多(duo)插入1m。全部(bu)(bu)反(fan)插法:開始從樁端至(zhi)柱頂全部(bu)(bu)進行反(fan)插,即開始拔(ba)管1m,再反(fan)插到(dao)(dao)底(di),以后每拔(ba)出1m,反(fan)插0.5m,直到(dao)(dao)拔(ba)出地面。
(3)采用復(fu)(fu)(fu)打法克服縮(suo)頸。局部復(fu)(fu)(fu)打法:在發(fa)生部位進行復(fu)(fu)(fu)打,超深1m。全復(fu)(fu)(fu)打法:即為二(er)次單打法的重復(fu)(fu)(fu),應(ying)注意同軸(zhou)沉入到原深度,灌入同樣的石料(liao)。
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深層密實法施工記錄要求:
1)強(qiang)夯施工的夯擊點(dian)布置及技術參數(shu)(錘直、落距(ju)、夯擊點(dian)、次數(shu)等)應設計要求,夯擊遍數(shu)和兩(liang)遍間的間歇(xie)時間,應符合(he)設計與(yu)施工規(gui)范要求;
2)施工過程中應對(dui)各項參數(shu)及施工情況進(jin)行(xing)詳細記(ji)錄,包括(kuo)夯(hang)點記(ji)錄與每(mei)遍的(de)匯總記(ji)錄,對(dui)強(qiang)夯(hang)地(di)基的(de)質量檢驗應在夯(hang)后一定的(de)間歇期之(zhi)后進(jin)行(xing);
3)振沖地基在正式(shi)施(shi)工前,應在現(xian)場在代表性的(de)場地上進行試樁試驗(yan),確(que)定有關施(shi)工參數(shu),做好記(ji)錄。施(shi)工時應檢查振沖器(qi)與填料的(de)性能(neng),太(tai)原(yuan)擠密(mi)樁施(shi)工設備租賃(lin),施(shi)工中應檢查各種施(shi)工參數(shu),并做好施(shi)工記(ji)錄。對(dui)振沖地基的(de)質(zhi)量檢驗(yan)應在根據不同的(de)填料,在施(shi)工結(jie)束后間歇一定時間進行。
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基(ji)底標高不(bu)符(fu)合要求現象(xiang):
(1)基槽(cao)(坑)底標高不符合設計規(gui)定(ding)值,造成(cheng)淺基礎埋(mai)置深(shen)度不足或超挖(wa)。
(2)基底持(chi)力(li)層(ceng)土質不符合設計要求,或被人工擾(rao)動,造成持(chi)力(li)層(ceng)承載能力(li)降低(di)。
1. 原因分析:
(1)測量放線錯誤,造(zao)成(cheng)基底標高不足(zu)或(huo)過深。
(2)地質(zhi)勘察資料與實際情況不符,雖已挖(wa)至設計規定深度,但土質(zhi)仍不符合設計要求。
(3)選用的(de)施工機械和(he)施工方法不當,造成超(chao)挖。
2. 預防措施:
(1)當發現控(kong)制樁或標(biao)志板有被碰撞和移動跡象(xiang)時,應復查校正,防止標(biao)高出現過大誤差(cha)。
(2)防止超挖(wa)。采(cai)用機械開挖(wa)基(ji)槽(坑)時,可在(zai)基(ji)底標高以上預留(liu)一(yi)層(ceng)土(tu)用人(ren)工清理(li),其厚度應根(gen)據施(shi)工機械確(que)定。
(3)基槽(坑(keng))挖至(zhi)基底(di)標高后,應會同設(she)計單位、監(jian)理單位(或建設(she)單位)檢查基底(di)土質是否(fou)符合要求,并作出隱蔽工程(cheng)記(ji)錄。
3. 治理方法:
(1)當開挖(wa)深度達到(dao)設(she)計(ji)規定,而土質不符(fu)合設(she)計(ji)要(yao)求時(shi),應(ying)會(hui)同(tong)設(she)計(ji)單位協商處理。
(2)如(ru)個別地方超挖時(shi),應(ying)用(yong)與(yu)基土(tu)相(xiang)同(tong)的(de)土(tu)料填(tian)補,并夯(hang)實至要求的(de)密(mi)實度,或(huo)用(yong)碎石類土(tu)填(tian)補并夯(hang)實。在重要部位(wei)超挖時(shi),可用(yong)低強度等(deng)級混凝土(tu)填(tian)補,并應(ying)取(qu)得設計(ji)單位(wei)同(tong)意(yi)。
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