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1、1钻孔桩断桩的原因分析1 analysis of the causes of drilling pile broken pile1.1钻孔桩成孔质量问题造成的断桩原因分析1.1 drilling pile hole quality problem caused by the fault reason analysis由于泥浆护壁差、孔内水头压力不够等原因，在清 孔后灌注混凝土过程中出现孔壁坍塌，造成断桩。由于 清孔过程中未对孔内泥浆含砂率进行严格控制，造成在 灌注混凝土过程中混凝土上沉渣过厚，导管内混凝土压 力不足以推动该部份沉渣，致使混凝土浇注中断。部分 在河床上通过筑岛法施工的钻孔桩基础，
2、由于河床表面 有一层流塑性淤泥层，在混凝土浇筑过程中河床淤泥层 顺孔壁流进钻孔内，致使混凝土浇注中断。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钢筋笼及浇筑混凝土用导管的问题造成断桩的 原因分析1.2 reinforcing cage and concrete analysis of the cause of broken pile with catheter questions导管接头
5、严重漏水，造成导管外泥浆及水进入导管，使导管内混凝土离析， 导管堵塞，混凝土浇筑中断， 造成断桩。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.由于钢筋笼主筋焊接及箍筋绑扎存在问题，在混凝 土浇筑过程中，钢筋笼卡住导管，致使导管难以提起， 混凝土浇筑中断，形成断桩。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浇筑用混凝土的问题造成断桩的原因分析1.3 casting with concrete problems analysis of the c
7、ause of broken pile混凝土塌落度过小，或和易性较差，造成导管堵塞， 混凝土浇筑中断，造成断桩。由于混凝土供应问题，造 成浇筑时间过长，浇注混凝土时首盘混凝土已经凝固， 混凝土浇筑难以继续，造成断桩。由于混凝土中出现凝 结的水泥块或石头等大块杂物，造成导管堵塞，混凝土 浇筑难以继续，造成断桩。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加强成孔质量控制2.1 to strengthen quality control into a hole护筒采用钢板制作，采用人工开挖埋设，护筒底部 与土层相接处用粘土夯实，护筒外面与原土之间用粘土 填满、夯实，土工布严防地表水从该处渗入。为保证护 筒内外水头的压力差护筒内水位应高出护筒外水位 1.5m，护筒埋设深度3m以上，同时，如果在成孔范围 内有流塑性淤泥等软弱夹层，应将护筒埋设穿越该软弱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.使用泥浆护壁，泥浆质量符合规范要求。对于地质 条件差的钻孔，使用优质泥浆。成孔后进行清孔，清孔 后泥浆比重、胶体率、含砂率、沉渣厚度等符合规范要 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控制浇筑混凝土用导管质量2.2 control of pouring concrete tube quality为防止导管接头与导管漏水，施工中我们通过严格 的事前、事中、事后控制，保证导管制作并具备以下条 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:足够的抗拉强度，能承受其自重和盛满混凝土的重Sufficient tensile strength, able to bear its weight andthe weight of the filled concrete.各节的安装接头所用的胶垫及法兰的对接位置，预 先试拼并作好标记，按插导管时须按试拼时的状态对号 拦装，所有的法兰盘接头均须垫入5-7mm厚的橡胶垫圈，安放时
15、须对正放平，拧紧螺栓，严防漏水。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.尽可能使用内径30cm以上的导管，并且内径应一 致，其误差应小于土 2mm，内壁须光滑无阻，组拼后须 用球塞、检查锤作通过试验。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 mm,inner surface should be smooth and shine, spellers ball plug, check after the hammer made by experiment.最下端一节
