從根本上減少斷樁基礎(chǔ)補強處理

1、1鉆孔樁斷樁的原因分析1 analysis of the causes of drilling pile broken pile1.1鉆孔樁成孔質(zhì)量問題造成的斷樁原因分析1.1 drilling pile hole quality problem caused by the fault reason analysis由于泥漿護壁差、孔內(nèi)水頭壓力不夠等原因，在清 孔后灌注混凝土過程中出現(xiàn)孔壁坍塌，造成斷樁。由于 清孔過程中未對孔內(nèi)泥漿含砂率進行嚴格控制，造成在 灌注混凝土過程中混凝土上沉渣過厚，導管內(nèi)混凝土壓 力不足以推動該部份沉渣，致使混凝土澆注中斷。部分 在河床上通過筑島法施工的鉆孔樁基礎(chǔ)，

2、由于河床表面 有一層流塑性淤泥層，在混凝土澆筑過程中河床淤泥層 順孔壁流進鉆孔內(nèi)，致使混凝土澆注中斷。Due to poor slurry-supported, hole head pressure is not enough, the hole cleaning after the collapse ofofflowhole wall, appeared in the process of pouring concrete pile breaking. Due to the black hole to hole the mud in the process of sand ratio to

3、carry on the strict control, cause in the process of pouring concrete on concrete to the too thickness of sediment, intraductal concrete pressure is not enough to push the ministry sediment, the concrete pouring. Part on the river built by island construction method of bored pile foundation, because

4、 the surface of the river a laminar plasticity silt layer, river bed silt layer in the process of concrete pouring flow in the wall of hole in drilling, the concrete pouring.1.2鋼筋籠及澆筑混凝土用導管的問題造成斷樁的 原因分析1.2 reinforcing cage and concrete analysis of the cause of broken pile with catheter questions導管接頭

5、嚴重漏水，造成導管外泥漿及水進入導管，使導管內(nèi)混凝土離析， 導管堵塞，混凝土澆筑中斷， 造成斷樁。Outside the pipe joint serious leaks, causing catheter mud and water into the pipe, the pipe inside the concrete segregation, catheter blockage, concrete pouring, caused the broken pile.由于鋼筋籠主筋焊接及箍筋綁扎存在問題，在混凝 土澆筑過程中，鋼筋籠卡住導管，致使導管難以提起， 混凝土澆筑中斷，形成斷樁。Beca

6、use of reinforcing cage of main reinforcement welding and stirrup binding problem exists, in the process of concrete pouring, steel reinforcement cage stuck pipe, causing them to mention, concrete pouring, form the broken pile.1.3澆筑用混凝土的問題造成斷樁的原因分析1.3 casting with concrete problems analysis of the c

7、ause of broken pile混凝土塌落度過小，或和易性較差，造成導管堵塞， 混凝土澆筑中斷，造成斷樁。由于混凝土供應(yīng)問題，造 成澆筑時間過長，澆注混凝土時首盤混凝土已經(jīng)凝固， 混凝土澆筑難以繼續(xù)，造成斷樁。由于混凝土中出現(xiàn)凝 結(jié)的水泥塊或石頭等大塊雜物，造成導管堵塞，混凝土 澆筑難以繼續(xù)，造成斷樁。Fall through small concrete, or poor workability, causing catheter blockage, concrete pouring, caused the broken pile. Causedby supply problems o

8、fconcrete, pouring time is too long, when pouring concrete before concrete has solidified, concrete pouring is difficult to continue, caused the broken pile.Due to condensation of concrete of concrete blocks or stones, etc. Large pieces of debris, causing catheter blockage, concrete pouring is diffi

9、cult to continue, caused the broken pile.2 drilled pile pile breaking prevention measures2.1加強成孔質(zhì)量控制2.1 to strengthen quality control into a hole護筒采用鋼板制作，采用人工開挖埋設(shè)，護筒底部 與土層相接處用粘土夯實，護筒外面與原土之間用粘土 填滿、夯實，土工布嚴防地表水從該處滲入。為保證護 筒內(nèi)外水頭的壓力差護筒內(nèi)水位應(yīng)高出護筒外水位 1.5m，護筒埋設(shè)深度3m以上，同時，如果在成孔范圍 內(nèi)有流塑性淤泥等軟弱夾層，應(yīng)將護筒埋設(shè)穿越該軟弱Buried l

10、iners made of steel plate by artificial excavation, protection and soil layer at the bottom of the barrel as clay compaction, liners between with the original soil outside the clay fill and compaction, fight infiltration of surface water from there. In order to ensure the protection of cylinder head

11、 of pressure difference inside and outside cylinder liners outside water level of 1.5 m, the water level should be higher than steel liners buried depth of more than 3 m, at the same time, if the hole radius flow plasticity silt soft interlayer, protecting tube should be embedding through the weak l

12、ayer.使用泥漿護壁，泥漿質(zhì)量符合規(guī)范要求。對于地質(zhì) 條件差的鉆孔，使用優(yōu)質(zhì)泥漿。成孔后進行清孔，清孔 后泥漿比重、膠體率、含砂率、沉渣厚度等符合規(guī)范要 求。Use the slurry-supported, mud quality conform to the requirements of the specification. For drilling with poor geological conditions, the use of high quality mud. Into a black hole after hole, hole cleaning after the mud

13、 weight, colloid ratio, sand ratio, sediment thickness conform to the requirements of the specification.2.2控制澆筑混凝土用導管質(zhì)量2.2 control of pouring concrete tube quality為防止導管接頭與導管漏水，施工中我們通過嚴格 的事前、事中、事后控制，保證導管制作并具備以下條 件：To prevent pipe joint and the pipe is leaking, we through strict during construction in

14、 advance, matter and afterwards control, guarantee the catheter produced and satisfy the following conditions:足夠的抗拉強度，能承受其自重和盛滿混凝土的重Sufficient tensile strength, able to bear its weight andthe weight of the filled concrete.各節(jié)的安裝接頭所用的膠墊及法蘭的對接位置，預(yù) 先試拼并作好標記，按插導管時須按試拼時的狀態(tài)對號 攔裝，所有的法蘭盤接頭均須墊入5-7mm厚的橡膠墊圈，安放時

15、須對正放平，擰緊螺栓，嚴防漏水。Each section of the installation of rubber mat used in the connector and flange of the docking position, try to spell and tag them in advance in accordance with the inserted catheters should be according to the state reserved block, when try to spell all flange joints shall be mat in

16、 5-7 mm thick rubber gasket, when put on is flat, tighten the bolt, protected from leaking.盡可能使用內(nèi)徑30cm以上的導管，并且內(nèi)徑應(yīng)一 致，其誤差應(yīng)小于土 2mm，內(nèi)壁須光滑無阻，組拼后須 用球塞、檢查錘作通過試驗。As far as possible use of more than 30 cm inner diameter tube, and the inner diameter should beconsistent, the error should be less than + /- 2 m

17、m,inner surface should be smooth and shine, spellers ball plug, check after the hammer made by experiment.最下端一節(jié)導管長度要長一些，一般為4米，其底端不得帶法蘭盤，以便在羥丙基甲基纖維素混凝土內(nèi)更 容易拔起。每節(jié)導管的長度要整齊統(tǒng)一，便于丈量長度，并作出標記和記錄。The bottom section duct length is longer, generally for4 meters, the bottom of the flange, so that in the concret

18、e internal pull up more easily. Each section of the tube length to tidy uniform, is advantageous for the measurement of length, and make a marked and recorded.導管使用前做好水密性試驗。導管要布置在鋼筋籠中心Tube well water tightness test before use. Tube is arranged in the center of the steel reinforcement cage.3.3控制鋼筋籠加工質(zhì)

19、量3.3 control of reinforcing cage and processing qualitybuttbe鋼筋籠主筋焊接一般應(yīng)采用對焊，以保證焊口平 順，當采用搭接焊時，要保證搭接部分不在鋼筋籠內(nèi)形 成錯臺。鋼筋骨架應(yīng)有強勁的內(nèi)撐架，保證在運輸及吊 裝過程中不變形。Reinforcing cage main reinforcement welding welding should be used commonly, to ensure that the joint smooth, when lap welding is used, to ensure the lap part

20、is not formed in the steel reinforcement cage fault. Inside the cage of reinforcement should strong brace, ensure no deformation in the process oftransportation and hoisting.and3.4加強混凝土生產(chǎn)運輸過程控制3.4 to strengthen the concrete production transportation process control混凝土拌合運輸能力均應(yīng)能夠滿足灌注混凝土的 要求，保證在灌注過程中能夠

21、滿足現(xiàn)場需要。Concrete mixing transport capacity should be able to meet the requirements of pouring concrete, guarantee in the filling process can meet the needs of the scene.混凝土配合比應(yīng)滿足灌注水下混凝土要求，即和易性、流動性都比較好，粗骨料粒徑小于導管內(nèi)徑的1/8Of concrete should meet the requirements of pouring underwater concrete, namely the w

22、orkability and fluidity is good, the aggregate particle size less than 1/8 of the tube inner diameter.3.5灌注混凝土過程中的控制3.5 the control in the process of pouring concrete空間，保證首盤混凝土能順利地灌注。同時，首盤混凝 土的灌注量應(yīng)至少保證灌注后將導管口埋入1m以上。在灌注混凝土過程中，應(yīng)隨時對導管埋入深度進行測 量，導管埋入深度遵循埋 6拔4的原則，即導管埋入 6 米后，拔起并拆除4米，土工膜保證導管埋置深度在 2 6米之間。在施工過程中，中途中斷澆注時間不宜走過 30分鐘，整個樁的澆注霎時間不宜過長，盡量在8小時內(nèi)完畢。混凝土施工中間每間斷30分鐘后，要上下串一上導管，防止混凝土失去流動性，提升導管困難，增 加發(fā)生事故的可能性。Perfusion first set concrete, the control at the bottomof the tube is 25 40 cm space, can guarantee thefirst concrete perfusion smoothly. At the same time,the first s