從根本上減少斷樁基礎(chǔ)補(bǔ)強(qiáng)處理（Word）

1、 從根本上減少斷樁基礎(chǔ)補(bǔ)強(qiáng)處理1鉆孔樁斷樁的原因分析1 analysis of the causes of drilling pile broken pile 1.1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(hù)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(duì)孔內(nèi)泥漿含砂率進(jìn)行嚴(yán)格控制，造成在灌注混凝土過程中混凝土上沉渣過厚，導(dǎo)管內(nèi)混凝土壓力不足以推動(dòng)該部份沉渣，致使混凝土澆注中斷。部分在河床上通過

2、筑島法施工的鉆孔樁基礎(chǔ)，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(jìn)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 of hole wall, appeared in the process of pouring concrete pile breaking. Due to the black hole to hole the mud in the process of sand rati

3、o to 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 of sediment, the concrete pouring. Part on the river built by island construction method of bored pile foundation,

4、 because the surface of the river a laminar flow plasticity silt layer, river bed silt layer in the process of concrete pouring flow in the wall of hole in drilling, the concrete pouring. 2 / 201.2鋼筋籠及澆筑混凝土用導(dǎo)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 cat

5、heter questions 導(dǎo)管接頭嚴(yán)重漏水，造成導(dǎo)管外泥漿及水進(jìn)入導(dǎo)管，使導(dǎo)管內(nèi)混凝土離析，導(dǎo)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(dǎo)管，致使導(dǎo)管難以提起，

6、混凝土澆筑中斷，形成斷樁。Because 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

7、 analysis of the cause of broken pile 混凝土塌落度過小，或和易性較差，造成導(dǎo)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(shí)間過長，澆注混凝土?xí)r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(dǎo)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. Caused by su

8、pply problems of concrete, 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

9、 pouring is difficult to continue, caused the broken pile. 2鉆孔樁斷樁的預(yù)防措施2 drilled pile pile breaking prevention measures 2.1加強(qiáng)成孔質(zhì)量控制2.1 to strengthen quality control into a hole 護(hù)筒采用鋼板制作，采用人工開挖埋設(shè)，護(hù)筒底部與土層相接處用粘土夯實(shí)，護(hù)筒外面與原土之間用粘土填滿、夯實(shí)，土工布嚴(yán)防地表水從該處滲入。為保證護(hù)筒內(nèi)外水頭的壓力差護(hù)筒內(nèi)水位應(yīng)高出護(hù)筒外水位1.5m，護(hù)筒埋設(shè)深度3m以上，同時(shí)，如果在成孔范圍內(nèi)有流塑性淤

10、泥等軟弱夾層，應(yīng)將護(hù)筒埋設(shè)穿越該軟弱層。Buried liners 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

11、 protection of cylinder head 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

12、embedding through the weak layer. 使用泥漿護(hù)壁，泥漿質(zhì)量符合規(guī)范要求。對(duì)于地質(zhì)條件差的鉆孔，使用優(yōu)質(zhì)泥漿。成孔后進(jìn)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, h

13、ole cleaning after the mud 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(dǎo)管質(zhì)量2.2 control of pouring concrete tube quality 為防止導(dǎo)管接頭與導(dǎo)管漏水，施工中我們通過嚴(yán)格的事前、事中、事后控制，保證導(dǎo)管制作并具備以下條件：To prevent pipe joint and the pipe is leaking, we through str

14、ict during construction in advance, matter and afterwards control, guarantee the catheter produced and satisfy the following conditions: 足夠的抗拉強(qiáng)度，能承受其自重和盛滿混凝土的重量。Sufficient tensile strength, able to bear its weight and the weight of the filled concrete. 各節(jié)的安裝接頭所用的膠墊及法蘭的對(duì)接位置，預(yù)先試拼并作好標(biāo)記，按插導(dǎo)管時(shí)須按試拼時(shí)的狀態(tài)對(duì)號(hào)攔

15、裝，所有的法蘭盤接頭均須墊入5-7mm厚的橡膠墊圈，安放時(shí)須對(duì)正放平，擰緊螺栓，嚴(yán)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

16、flange joints shall be mat in 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(dǎo)管，并且內(nèi)徑應(yīng)一致，其誤差應(yīng)小于±2mm，內(nèi)壁須光滑無阻，組拼后須用球塞、檢查錘作通過試驗(yàn)。As far as possible use of more than 30 cm inner diameter tube, and the inner diameter should be consistent, the e

17、rror should be less than + / - 2 mm, inner surface should be smooth and shine, spellers ball plug, check after the hammer made by experiment. 最下端一節(jié)導(dǎo)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(dǎo)管的長度要整齊統(tǒng)一，便于丈量長度，并作出標(biāo)記和記錄。The bottom section duct length is longer, generally for 4 meters, the bottom o

18、f the flange, so that in the concrete 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(dǎo)管使用前做好水密性試驗(yàn)。導(dǎo)管要布置在鋼筋籠中心。Tube well water tightness test before use. Tube is arranged in the center of th

19、e steel reinforcement cage. 3.3控制鋼筋籠加工質(zhì)量3.3 control of reinforcing cage and processing quality 鋼筋籠主筋焊接一般應(yīng)采用對(duì)焊，以保證焊口平順，當(dāng)采用搭接焊時(shí)，要保證搭接部分不在鋼筋籠內(nèi)形成錯(cuò)臺(tái)。鋼筋骨架應(yīng)有強(qiáng)勁的內(nèi)撐架，保證在運(yùn)輸及吊裝過程中不變形。Reinforcing cage main reinforcement welding butt welding should be used commonly, to ensure that the joint smooth, when lap weld

20、ing is used, to ensure the lap part is not formed in the steel reinforcement cage fault. Inside the cage of reinforcement should be strong brace, ensure no deformation in the process of transportation and hoisting. 3.4加強(qiáng)混凝土生產(chǎn)運(yùn)輸過程控制3.4 to strengthen the concrete production and transportation process

21、control 混凝土拌合運(yùn)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(dòng)性都比較好，粗骨料粒徑小于導(dǎo)管內(nèi)徑的1/8。Of concrete should meet the requirements

22、of pouring underwater concrete, namely the workability 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 灌注首盤混凝土?xí)r，控制導(dǎo)管底部有2540cm的空間，保證首盤混凝土能順利地灌注。同時(shí)，首盤混凝土的灌注量應(yīng)至少保證灌注后將導(dǎo)管口埋入1m以上。在灌注混凝土過程中，應(yīng)隨時(shí)對(duì)導(dǎo)管埋

23、入深度進(jìn)行測(cè)量，導(dǎo)管埋入深度遵循埋6拔4的原則，即導(dǎo)管埋入6米后，拔起并拆除4米，土工膜保證導(dǎo)管埋置深度在26米之間。在施工過程中，中途中斷澆注時(shí)間不宜走過30分鐘，整個(gè)樁的澆注霎時(shí)間不宜過長，盡量在8小時(shí)內(nèi)完畢?；炷潦┕ぶ虚g每間斷30分鐘后，要上下串一上導(dǎo)管，防止混凝土失去流動(dòng)性，提升導(dǎo)管困難，增加發(fā)生事故的可能性。Perfusion first set concrete, the control at the bottom of the tube is 25 40 cm space, can guarantee the first concrete perfusion smoothly. At the same time, the first set of concrete perfusion measure should ens