bv灌注桩成孔常见施工方法.doc
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1、【精品文档】如有侵权,请联系网站删除,仅供学习与交流bv灌注桩成孔常见施工方法.精品文档.灌注桩施工常见的成孔方法一、灌注桩成孔的常见方法1、长螺旋钻机成孔法螺旋钻孔机成孔是一种无泥浆循环的机械式干作业连续成孔成桩的施工方法,是利用动力旋转钻杆,使钻头的螺旋叶片旋转削土,土块沿螺旋叶片上升排出孔外。因不采取护壁措施,一般仅适用于地下水位以上的填土、粘性土、粉土、砂性土、卵砾石层等。液压步履式,能自主行走。2、冲击钻机成孔法 冲击钻进成孔是采用冲击式钻机用卷扬机带动一定质量的冲击钻头(或称为冲锥),在一定的高度内周期性地作自由落体运动,冲击破碎岩层或冲挤土层形成桩孔,再用捞渣筒或泥浆循环等方法将
2、岩屑钻渣排出的成孔方法。适应范围较广,能适应各类地质条件,在施工中使用也较多。3、旋挖钻机成孔旋挖钻机成孔,首先是通过钻机自有的行走功能和桅杆变幅机构使得钻具能正确的就位到桩位,利用桅杆导向下放钻杆将底部带有活门的桶式钻头置放到孔位,钻机动力头装置为钻杆提供扭矩、加压装置通过加压动力头的方式将加压力传递给钻杆钻头,钻头回转破碎岩土,并直接将其装入钻头内,然后再由钻机提升装置和伸缩式钻杆将钻头提出孔外卸土,这样循环往复,不断地取土、卸土,直至钻至设计深度。旋挖钻机一般适用粘土、粉土、砂土、淤泥质土、人工回填土及含有部分卵石、碎石的地层。根据不同的地质条件选用不同的钻杆、钻头及合理的斗齿刃角。对于
3、具有大扭矩动力头和自动内锁式伸缩钻杆的钻机,可以适应微风化岩层的施工。液压步履式,能自主行走。4、人工挖孔法人工挖孔是一种通过人力开挖而形成井筒的成孔方法。在人工开挖送土的过程中,要用砼或钢筋砼井圈护壁。一般适用于土质较好、地下水位较低的粘土、含少量砂卵石的黏土层。二、正反循环、气举、泵吸法等原理1、正循环法由泥浆泵往钻杆输进泥浆,泥浆沿孔壁上升,从孔口溢浆孔溢出流入泥浆池,经沉淀处理返回循环池2、反循环法利用泵吸、气举、喷射等措施抽吸循环护壁泥浆,挟带钻渣从钻杆内腔抽吸出孔外的成孔方法。根据抽吸原理不同可分为泵吸反循环、气举反循环和喷射射流)反循环三种施工工艺。泵吸反循环是直接利用砂石泵的抽
4、吸作用使钻杆的水流上升而形成反循环;喷射反循环是利用射流泵射出的高速水流产生负压使钻杆内的水流上升而行成反循环;气举反循环是利用送入压缩空气使水循环,钻杆内水流上升速度与钻杆内外液柱重度差有关,随孔深增大效率增加。三、泥浆的作用泥浆的作用是护壁、携砂排土、切土润滑、冷却钻头等,其中以护壁为主。泥浆制备方法应根据土质条件确定:在粘土和粉质粘土中成孔时,可注入清水,以原土造浆,排渣泥浆的密度应控制在1113gcm3;在其他土层中成孔,泥浆可选用高塑性(Ip17)的粘土或膨润土制备;在砂土和较厚夹砂层中成孔时,泥浆密度应控制在1113gcm3;在穿过砂夹卵石层或容易塌孔的土层中成孔时,泥浆密度应控制
5、在1315gcm3。施工中应经常测定泥浆密度,并定期测定粘度、含砂率和胶体率。泥浆的控制指标为粘度1822s、含砂率不大于8、胶体率不小于90,为了提高泥浆质量可加入外掺料,如增重剂、增粘剂、分散剂等。(英文版 ) easily blame, to prevent the broken window effect. Supervise the leading cadres to play an exemplary role, take the lead in the strict implementation of the and , lead to safeguard the solemni
6、ty and authority of the party discipline, ensure that the party discipline and the laws and regulations for implementation in place. Throughout the discipline in the daily supervision and management, strengthen supervision and inspection, from the thorough investigation of violations of discipline b
7、ehavior. Strengthen to key areas, key departments and key projects as well as the masses reflect the concentration of the units and departments for supervision. - strengthening supervision, discipline inspection and supervision of cadres to set an example for compliance with the and is a man must be
8、 hexyl, blacksmith needs its own hardware. Discipline inspection organs as the executor of the party discipline, and supervisor of the defenders, for its supervision must be more strictly, discipline inspection and supervision of cadres to firmly establish the awareness of Party Constitution, sense
9、of discipline and rules consciousness, politics loyalty, sense obey. Action speak Ji Ordinance to set an example of the regulations of the rule of law, strengthen supervision and accept the supervision of the firmness and consciousness, do comply with and . To firmly establish the discipline must fi
10、rst be disciplined, the supervisor will be subject to the supervision of concept, and consciously safeguard and implement party compasses party, take the lead in practicing three strict real strict, so loyal, clean, play. To be good at learning, the Constitution and the as morality, politics and bro
11、ught to fruition; to implement , do not want to, dare not, not with disciplinary ruler to supervision; to discipline a ruler, often the control inspection, and consciously in the ideological red line to draw the row Ming Good accumulation is indeed the bottom line, so that the heart has fear, said t
12、o have quit, the line has ended. Attached: indifferent to heart, calmly to the table in our life, there are many unpredictable things will happen, some good, some bad things, we cannot control is powerless to stop, but with time, you will find in life sometimes turns out to be not good, some bad thi
13、ngs finally turned out to be a good thing, but then we muddy however did not know, this is the life teach us things. 1, life can be complex, can also be simple. Want simple life of precipitation, to have enough time to reflect, to make Become more perfect. Life is the most important thing is not to
14、win, but the struggle; not to have conquered, but to have fought well. 2, the plain is the background of life. Live a plain life, give up on themselves is not a coward, but the wise answers; not disillusioned after the heart, such as ashes, but experience the storm after the enlightenment; not unrew
15、arding perfunctorily, but calm attitude of life of unrestrained self-confidence. Plain living, there is no noise noisy, no earthly troubles, more did not fill in the discontent of desire, some just a calm, a calm. 3, memory of heart will not good things to erase the, life is a When no movie, pain is
16、 a beginning, the struggle is a kind of process, death is a kind of ending. Give up this giving up is the helpless, do not give up the abandoned, do not give up this giving up is ignorance, do not give up should not give up is persistent. 4, a thing figured is heaven, think impassability is hell. Si
17、nce the living, to live better. Sometimes we because of too narrow-minded, too care around the chores and penny wise and pound foolish, not worth the candle. Some things to attract trouble and worry, completely depends on how we look at and deal with it. Dont always take everything back to things, a
18、nd dont get into a blind alley, dont want to face, dont be narrow-minded. Poke to care, is a kind of open-minded, a free and easy. 5, I am not afraid of others behind me a knife, I afraid to look back and see stab me, is my intention to treat people; I am not afraid of the truth to tell the best fri
19、end, Im afraid he turned to it as a joke to tell dont 6, when we are in a positive frame of mind, you will find many good things; and when we are in a negative state of mind, you will find many depressed things; life happy and worry, all is you of life attitude, optimistic, good luck; loss of sink,
20、Eritrea company. When you are in adversity, may wish to change a point of view to think everything over to the good Think, because good mentality decided the fate of the! 7, people are tired, rest; heart tired, calm. Grow up, mature, this society read. Tired and sad, squat down, to their a hug. Beca
21、use the world no one can sympathize with you, have mercy on you. You cry, tears is your own; you pain, no one can understand. Then you only tears to smile. 8, each people have youth,Each youth are a story, the life of the world never gets easier, I want what, wish the world all know, as has been the
22、 same; now want anything, for fear that others know, or like to lose the same. 9, the heart move, everything in the world is followed by birth, Rangrang, important thing is often the most difficult to open ones mouth, because words will reduce its importance; to let strangers people care about your
23、life in the good things, the original is not easy 10, do not blame, do not laugh at who, also dont envy who. Like a person is a kind of feeling, not like a person is true. The truth is easy to explain, I feel Is unspeakable. The best travel life is that you in a strange place found a long lost touch
24、ed. 11, happy life not in the bustling in, and in the peace of mind; no matter how many grievances, how uncomfortable, and ultimately to heal themselves or their own, others may got you to comfort, but never know your heart is how wanjianchuanxin. 12, maam, like a movie, learn to appreciate, learn t
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