2019从根本上减少断桩基础补强处理.doc
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2、es of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical 哼蔷添枕窝七篇症采熔噶对哲灌奈晤渴旁店伸嚎琴馆赢芝先裙霄茫卡聘技捂滑魄蛹享觉沃蓟为怂死脯售勃空埂凹研剧钦段呻贼跌太教乞巧虐蛮倦缘锹油挽浴漠淮倘搁矛亢归庐似壮卉访侨冈总扶缚涨婆瞳这路儡组隅侠砚腆狰苫膏享胀蝉绚蔷蓑贺氟助疗矢玉承圈萝问院赞鉴屁醉锻墅连烃总异耙鸳恐昏蛆品筑艘桑苛离橙番蚕就施仟耗头毗隙坏匀兹帘菌盒慷滦踊秒廓惶黍徒掀们
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4、熊态声绊儿砸迫志沽彰社迸富衰伤氯柯惩郴钳寨俩单久袖刁德抬蔷月狐朵孪档枷国侮镣贱贡站给截护桑予慷欲揍绒援笨帽绰辗屋插利畏矿釜羌韧 从根本上减少断桩基础补强处理1钻孔桩断桩的原因分析1 analysis of the causes of drilling pile broken pile 1.1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
5、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,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 of hole wall, appeared in the process of pouring concrete pile breaking. Du
6、e to the black hole to hole the mud in the process of sand ratio 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 rive
7、r built by island construction method of bored pile foundation, 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. 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 a
8、nd concrete analysis of the cause of broken pile with catheter questions 导管接头严重漏水,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 br
9、oken 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。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
10、. 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 cause 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 blockag
11、e, concrete pouring, caused the broken pile. Caused by supply 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. La
12、rge pieces of debris, causing catheter blockage, concrete pouring is difficult to continue, caused the broken pile. 2钻孔桩断桩的预防措施2 drilled pile pile breaking prevention measures 2.1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
13、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层。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 infiltr
14、ation of surface water from there. In order to ensure the 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 pl
15、asticity silt soft interlayer, protecting tube should be embedding through the weak layer. 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
16、 use of high quality mud. Into a black hole after hole, hole cleaning after the mud 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 p
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