南平至龙岩扩能改造工程NLZQ-4标螺杆桩试桩方案.doc

南平至龙岩扩能改造工程NLZQ-4标螺杆桩试桩方案目 录一、试桩编制依据1二、试桩内容及要求、目的12.1试桩内容及要求12.2试桩目的5三、工程概况53.1工程简介53.2地层岩性133.3水文地质143.4物理地质143.5不良地质143.6地下管线调查14四、施工安排154.1施工人员及设备情况154.2施工用电174.3施工用水184.4测量准备184.5试验测试184.6内业资料194.7施工工期19五、施工方案275.1施工工艺说明：285.2施工注意事项305.3螺杆桩施工质量保证措施305.4常见质量缺陷的原因及控制技术31六、桩基检测32七、质量保证措施34八、安全保证措施358.1一般规定358.2施工用电安全358.3贯彻“安全第一、预防为主”的方针358.4安全生产管理制度36九、环境保护及文明施工措施379.1环境保护379.2现场文明施工38附表 表C.0.11螺杆桩施工记录表39中铁十六局集团公司南龙铁路NLZQ-4标项目经理部 一、试桩编制依据 三明南站路基设计图；螺杆桩设计与施工技术规程(CFG-LGZ-2006JG)建筑地基基础设计规范(GB5007-2002)建筑地基基础工程施工质量验收规范(GB50202-2002)二、试桩内容及要求、目的本次试桩由设计单位提出，施工单位实施，建设单位及监理单位监督检查。施工单位成立以总工程师为组长的领导小组，施工分部负责人参加、现场技术主管实施，并配备物资、设备专人负责。2.1试桩内容及要求根据初步设计审查意见要求，结合施工图设计所采用的地基处理方案，于新近人工填土区提前开展试桩，试桩里程选择三个具有代表性断面，见表1，试桩桩号见表2-1、2-2、2-3，试桩区域平面图见图1，螺杆桩编号方法见3.1工程简介。表1 试桩断面试桩断面桩型桩长(m)桩径(m)桩间距(m)根数桩顶条件DK85+270.08螺杆桩17.519.00.51.835垫层+土工格栅DK85+583.20螺杆桩16.50.51.851垫层+土工格栅DK85+777.49螺杆桩140.51.852垫层+土工格栅表2-1 试桩编号序号里程桩基编号桩顶标高序号里程桩基编号桩顶标高1DK85+270.08A-131-1136.700 19DK85+270.08A-131-19136.541 2DK85+270.08A-131-2136.691 20DK85+270.08A-131-20136.532 3DK85+270.08A-131-3136.682 21DK85+270.08A-131-21136.524 4DK85+270.08A-131-4136.674 22DK85+270.08A-131-22136.515 5DK85+270.08A-131-5136.665 23DK85+270.08A-131-23136.506 6DK85+270.08A-131-6136.656 24DK85+270.08A-131-24136.497 7DK85+270.08A-131-7136.647 25DK85+270.08A-131-25136.488 8DK85+270.08A-131-8136.638 26DK85+270.08A-131-26136.479 9DK85+270.08A-131-9136.629 27DK85+270.08A-131-27136.471 10DK85+270.08A-131-10136.621 28DK85+270.08A-131-28136.462 11DK85+270.08A-131-11136.612 29DK85+270.08A-131-29136.453 12DK85+270.08A-131-12136.603 30DK85+270.08A-131-30136.444 13DK85+270.08A-131-13136.594 31DK85+270.08A-131-31136.435 14DK85+270.08A-131-14136.585 32DK85+270.08A-131-32136.426 15DK85+270.08A-131-15136.576 33DK85+270.08A-131-33136.418 16DK85+270.08A-131-16136.568 34DK85+270.08A-131-34136.409 17DK85+270.08A-131-17136.559 35DK85+270.08A-131-35136.400 18DK85+270.08A-131-18136.550 表2-2 试桩编号序号里程桩基编号桩顶标高序号里程桩基编号桩顶标高1DK85+583.20C-160-1136.706 27DK85+583.20C-160-27136.881 2DK85+583.20C-160-2136.713 28DK85+583.20C-160-28136.888 3DK85+583.20C-160-3136.719 29DK85+583.20C-160-29136.895 4DK85+583.20C-160-4136.726 30DK85+583.20C-160-30136.901 5DK85+583.20C-160-5136.733 31DK85+583.20C-160-31136.908 6DK85+583.20C-160-6136.740 32DK85+583.20C-160-32136.915 7DK85+583.20C-160-7136.746 33DK85+583.20C-160-33136.922 8DK85+583.20C-160-8136.753 34DK85+583.20C-160-34136.928 9DK85+583.20C-160-9136.760 35DK85+583.20C-160-35136.935 10DK85+583.20C-160-10136.767 36DK85+583.20C-160-36136.942 11DK85+583.20C-160-11136.773 37DK85+583.20C-160-37136.949 12DK85+583.20C-160-12136.780 38DK85+583.20C-160-38136.955 13DK85+583.20C-160-13136.787 39DK85+583.20C-160-39136.962 14DK85+583.20C-160-14136.794 40DK85+583.20C-160-40136.969 15DK85+583.20C-160-15136.800 41DK85+583.20C-160-41136.976 16DK85+583.20C-160-16136.807 42DK85+583.20C-160-42136.982 17DK85+583.20C-160-17136.814 43DK85+583.20C-160-43136.989 18DK85+583.20C-160-18136.821 44DK85+583.20C-160-44136.996 19DK85+583.20C-160-19136.827 45DK85+583.20C-160-45137.003 20DK85+583.20C-160-20136.834 46DK85+583.20C-160-46137.009 21DK85+583.20C-160-21136.841 47DK85+583.20C-160-47137.016 22DK85+583.20C-160-22136.848 48DK85+583.20C-160-48137.023 23DK85+583.20C-160-23136.854 49DK85+583.20C-160-49137.030 24DK85+583.20C-160-24136.861 50DK85+583.20C-160-50137.036 25DK85+583.20C-160-25136.868 51DK85+583.20C-160-51137.043 26DK85+583.20C-160-26136.875 表2-3 试桩编号序号里程桩基编号桩顶标高序号里程桩基编号桩顶标高1DK85+777.49B-8-1135.1727DK85+777.49B-8-27135.1692DK85+777.49B-8-2135.1728DK85+777.49B-8-28135.1693DK85+777.49B-8-3135.1729DK85+777.49B-8-29135.1694DK85+777.49B-8-4135.1730DK85+777.49B-8-30135.1695DK85+777.49B-8-5135.1731DK85+777.49B-8-31135.1696DK85+777.49B-8-6135.1732DK85+777.49B-8-32135.1697DK85+777.49B-8-7135.1733DK85+777.49B-8-33135.1698DK85+777.49B-8-8135.1734DK85+777.49B-8-34135.1699DK85+777.49B-8-9135.1735DK85+777.49B-8-35135.16910DK85+777.49B-8-10135.1736DK85+777.49B-8-36135.16911DK85+777.49B-8-11135.1737DK85+777.49B-8-37135.16912DK85+777.49B-8-12135.1738DK85+777.49B-8-38135.16913DK85+777.49B-8-13135.1739DK85+777.49B-8-39135.16914DK85+777.49B-8-14135.1740DK85+777.49B-8-40135.16915DK85+777.49B-8-15135.1741DK85+777.49B-8-41135.16916DK85+777.49B-8-16135.1742DK85+777.49B-8-42135.16917DK85+777.49B-8-17135.1743DK85+777.49B-8-43135.16918DK85+777.49B-8-18135.1744DK85+777.49B-8-44135.16919DK85+777.49B-8-19135.1745DK85+777.49B-8-45135.16920DK85+777.49B-8-20135.1746DK85+777.49B-8-46135.16921DK85+777.49B-8-21135.1747DK85+777.49B-8-47135.16922DK85+777.49B-8-22135.1748DK85+777.49B-8-48135.16923DK85+777.49B-8-23135.1749DK85+777.49B-8-49135.16924DK85+777.49B-8-24135.1750DK85+777.49B-8-50135.16925DK85+777.49B-8-25135.1751DK85+777.49B-8-51135.16926DK85+777.49B-8-26135.1752DK85+777.49B-8-52135.169图1 螺杆桩试桩平面图根据设计图纸要求，螺杆桩采用C30混凝土配合而成，水泥采用PO 42.5级及以上普通硅酸盐水泥，混合料28天龄期标准试块抗压强度不小于20.1MPa。螺杆桩几何断面为“上部为直柱型，下部为螺杆型”，直柱段长度4.68m(约占桩长的1/3),螺杆段长度9.416m(约占桩长2/3)。本试验方案分两段共打设138根桩基，桩径500mm，桩间距1.8m，设计桩长12.520.5m，桩要求进入硬层不小于1.0m，桩基桩位布置形式采用正方形布置。2.2试桩目的试桩是为了大范围的螺杆桩作业提供实际可靠的施工参数资料和检验设备、工艺是否满足技术标准及设计要求，进一步调整、优化地基处理加固方施工案。通过成桩性工艺试验，以达到以下目的：确定单桩承载力，复合地基承载力。检验施工设备及选定的施工工艺。桩身质量检测。 进行桩身完整性检测、桩身强度检测，确定桩身成桩28天后无侧限抗压强度是否可以达到设计强度(混合料28天龄期标准试块抗压强度不小于20.1Mpa)，为优化施工参数和水泥掺入量、水灰比提供依据。检验施工技术和资源配备是否满足质量验收标准和设计及工期要求。三、工程概况3.1工程简介三明南站(DK 85+050DK 86+850)位于沙溪河河漫滩及河流阶地，地形较平缓，场区人工填土层较厚，且土质松散，属于软土路基。部分地段地基加固采用螺杆桩加固：DK 85+068.48DK 85+586.59、DK 85+764.89DK 85+845.0、DK 86+127.5DK 86+225.24、DK 86+317.5DK 86+337.5、DK 86+430.0DK 86+556.0。设计施工螺杆桩16308根，共227683m。 螺杆桩=0.5m，桩间距1.8m，正方形布置，桩长4.020.5m，螺杆桩进入硬层不小于1.0m，桩顶铺设0.5m碎石+0.1m中粗砂垫层，垫层内铺设一二层单向塑料(聚丙烯)土工格栅(填高大于6m，铺设二层)。其极限抗拉强度不小于260kN/m。三明南站螺杆桩分布见表3表3 三明南站螺杆桩分布情况序号里程长度处理方法1DK85+068.48DK85+586.59518.11米螺杆桩2DK85+764.89DK85+845.0080.11米螺杆桩3DK86+127.50DK86+225.2497.74米螺杆桩4DK86+317.50DK86+337.5020.00米螺杆桩5DK86+430.00DK86+556.00126.00米螺杆桩螺杆桩编号原则为：区段-排数-根数，区段为A、B、C、D、E五个区域，排数为从区段开始里程为第一排，往大里程每1.8m增加一排，螺杆桩分区见图2，根数从左边算起为第一根。螺杆桩桩基编号方法见图3，螺杆桩排数及里程对照表见表4-1、4-2、4-3。图2 螺杆桩分区图3 螺杆桩编号方法表4-1 A、C区桩基编号序号区段号里程编号序号区段号里程编号1ADK85+068.48A-1-1N1CDK85+297.00C-1-1N2ADK85+070.28A-2-1N2CDK85+298.80C-2-1N3ADK85+072.08A-3-1N3CDK85+300.60C-3-1N4ADK85+073.88A-4-1N4CDK85+302.40C-4-1N5ADK85+075.68A-5-1N5CDK85+304.20C-5-1N6ADK85+077.48A-6-1N6CDK85+306.00C-6-1N7ADK85+079.28A-7-1N7CDK85+307.80C-7-1N8ADK85+081.08A-8-1N8CDK85+309.60C-8-1N9ADK85+082.88A-9-1N9CDK85+311.40C-9-1N10ADK85+084.68A-10-1N10CDK85+313.20C-10-1N11ADK85+086.48A-11-1N11CDK85+315.00C-11-1N12ADK85+088.28A-12-1N12CDK85+316.80C-12-1N13ADK85+090.08A-13-1N13CDK85+318.60C-13-1N14ADK85+091.88A-14-1N14CDK85+320.40C-14-1N15ADK85+093.68A-15-1N15CDK85+322.20C-15-1N16ADK85+095.48A-16-1N16CDK85+324.00C-16-1N17ADK85+097.28A-17-1N17CDK85+325.80C-17-1N18ADK85+099.08A-18-1N18CDK85+327.60C-18-1N19ADK85+100.88A-19-1N19CDK85+329.40C-19-1N20ADK85+102.68A-20-1N20CDK85+331.20C-20-1N21ADK85+104.48A-21-1N21CDK85+333.00C-21-1N22ADK85+106.28A-22-1N22CDK85+334.80C-22-1N23ADK85+108.08A-23-1N23CDK85+336.60C-23-1N24ADK85+109.88A-24-1N24CDK85+338.40C-24-1N25ADK85+111.68A-25-1N25CDK85+340.20C-25-1N26ADK85+113.48A-26-1N26CDK85+342.00C-26-1N27ADK85+115.28A-27-1N27CDK85+343.80C-27-1N28ADK85+117.08A-28-1N28CDK85+345.60C-28-1N29ADK85+118.88A-29-1N29CDK85+347.40C-29-1N30ADK85+120.68A-30-1N30CDK85+349.20C-30-1N31ADK85+122.48A-31-1N31CDK85+351.00C-31-1N32ADK85+124.28A-32-1N32CDK85+352.80C-32-1N33ADK85+126.08A-33-1N33CDK85+354.60C-33-1N34ADK85+127.88A-34-1N34CDK85+356.40C-34-1N35ADK85+129.68A-35-1N35CDK85+358.20C-35-1N36ADK85+131.48A-36-1N36CDK85+360.00C-36-1N37ADK85+133.28A-37-1N37CDK85+361.80C-37-1N38ADK85+135.08A-38-1N38CDK85+363.60C-38-1N39ADK85+136.88A-39-1N39CDK85+365.40C-39-1N40ADK85+138.68A-40-1N40CDK85+367.20C-40-1N41ADK85+140.48A-41-1N41CDK85+369.00C-41-1N42ADK85+142.28A-42-1N42CDK85+370.80C-42-1N43ADK85+144.08A-43-1N43CDK85+372.60C-43-1N44ADK85+145.88A-44-1N44CDK85+374.40C-44-1N45ADK85+147.68A-45-1N45CDK85+376.20C-45-1N46ADK85+149.48A-46-1N46CDK85+378.00C-46-1N47ADK85+151.28A-47-1N47CDK85+379.80C-47-1N48ADK85+153.08A-48-1N48CDK85+381.60C-48-1N49ADK85+154.88A-49-1N49CDK85+383.40C-49-1N50ADK85+156.68A-50-1N50CDK85+385.20C-50-1N51ADK85+158.48A-51-1N51CDK85+387.00C-51-1N52ADK85+160.28A-52-1N52CDK85+388.80C-52-1N53ADK85+162.08A-53-1N53CDK85+390.60C-53-1N54ADK85+163.88A-54-1N54CDK85+392.40C-54-1N55ADK85+165.68A-55-1N55CDK85+394.20C-55-1N56ADK85+167.48A-56-1N56CDK85+396.00C-56-1N57ADK85+169.28A-57-1N57CDK85+397.80C-57-1N58ADK85+171.08A-58-1N58CDK85+399.60C-58-1N59ADK85+172.88A-59-1N59CDK85+401.40C-59-1N60ADK85+174.68A-60-1N60CDK85+403.20C-60-1N61ADK85+176.48A-61-1N61CDK85+405.00C-61-1N62ADK85+178.28A-62-1N62CDK85+406.80C-62-1N63ADK85+180.08A-63-1N63CDK85+408.60C-63-1N64ADK85+181.88A-64-1N64CDK85+410.40C-64-1N65ADK85+183.68A-65-1N65CDK85+412.20C-65-1N66ADK85+185.48A-66-1N66CDK85+414.00C-66-1N67ADK85+187.28A-67-1N67CDK85+415.80C-67-1N68ADK85+189.08A-68-1N68CDK85+417.60C-68-1N69ADK85+190.88A-69-1N69CDK85+419.40C-69-1N70ADK85+192.68A-70-1N70CDK85+421.20C-70-1N71ADK85+194.48A-71-1N71CDK85+423.00C-71-1N72ADK85+196.28A-72-1N72CDK85+424.80C-72-1N73ADK85+198.08A-73-1N73CDK85+426.60C-73-1N74ADK85+199.88A-74-1N74CDK85+428.40C-74-1N75ADK85+201.68A-75-1N75CDK85+430.20C-75-1N76ADK85+203.48A-76-1N76CDK85+432.00C-76-1N77ADK85+205.28A-77-1N77CDK85+433.80C-77-1N78ADK85+207.08A-78-1N78CDK85+435.60C-78-1N79ADK85+208.88A-79-1N79CDK85+437.40C-79-1N80ADK85+210.68A-80-1N80CDK85+439.20C-80-1N81ADK85+212.48A-81-1N81CDK85+441.00C-81-1N82ADK85+214.28A-82-1N82CDK85+442.80C-82-1N83ADK85+216.08A-83-1N83CDK85+444.60C-83-1N84ADK85+217.88A-84-1N84CDK85+446.40C-84-1N85ADK85+219.68A-85-1N85CDK85+448.20C-85-1N86ADK85+221.48A-86-1N86CDK85+450.00C-86-1N87ADK85+223.28A-87-1N87CDK85+451.80C-87-1N88ADK85+225.08A-88-1N88CDK85+453.60C-88-1N89ADK85+226.88A-89-1N89CDK85+455.40C-89-1N90ADK85+228.68A-90-1N90CDK85+457.20C-90-1N91ADK85+230.48A-91-1N91CDK85+459.00C-91-1N92ADK85+232.28A-92-1N92CDK85+460.80C-92-1N93ADK85+234.08A-93-1N93CDK85+462.60C-93-1N94ADK85+235.88A-94-1N94CDK85+464.40C-94-1N95ADK85+237.68A-95-1N95CDK85+466.20C-95-1N96ADK85+239.48A-96-1N96CDK85+468.00C-96-1N97ADK85+241.28A-97-1N97CDK85+469.80C-97-1N98ADK85+243.08A-98-1N98CDK85+471.60C-98-1N99ADK85+244.88A-99-1N99CDK85+473.40C-99-1N100ADK85+246.68A-100-1N100CDK85+475.20C-100-1N101ADK85+248.48A-101-1N101CDK85+477.00C-101-1N102ADK85+250.28A-102-1N102CDK85+478.80C-102-1N103ADK85+252.08A-103-1N103CDK85+480.60C-103-1N104ADK85+253.88A-104-1N104CDK85+482.40C-104-1N105ADK85+255.68A-105-1N105CDK85+484.20C-105-1N106ADK85+257.48A-106-1N106CDK85+486.00C-106-1N107ADK85+259.28A-107-1N107CDK85+487.80C-107-1N108ADK85+261.08A-108-1N108CDK85+489.60C-108-1N109ADK85+262.88A-109-1N109CDK85+491.40C-109-1N110ADK85+264.68A-110-1N110CDK85+493.20C-110-1N111ADK85+266.48A-111-1N111CDK85+495.00C-111-1N112ADK85+268.28A-112-1N112CDK85+496.80C-112-1N113ADK85+270.08A-113-1N113CDK85+498.60C-113-1N114ADK85+271.88A-114-1N114CDK85+500.40C-114-1N115ADK85+273.68A-115-1N115CDK85+502.20C-115-1N116ADK85+275.48A-116-1N116CDK85+504.00C-116-1N117ADK85+277.28A-117-1N117CDK85+505.80C-117-1N118ADK85+279.08A-118-1N118CDK85+507.60C-118-1N119ADK85+280.88A-119-1N119CDK85+509.40C-119-1N120ADK85+282.68A-120-1N120CDK85+511.20C-120-1N121ADK85+284.48A-121-1N121CDK85+513.00C-121-1N122ADK85+286.28A-122-1N122CDK85+514.80C-122-1N123ADK85+288.08A-123-1N123CDK85+516.60C-123-1N124ADK85+289.88A-124-1N124CDK85+518.40C-124-1N125ADK85+291.68A-125-1N125CDK85+520.20C-125-1N126ADK85+293.48A-126-1N126CDK85+522.00C-126-1N127ADK85+295.28A-127-1N127CDK85+523.80C-127-1N128ADK85+297.08A-128-1N128CDK85+525.60C-128-1N129CDK85+527.40C-129-1N130CDK85+529.20C-130-1N131CDK85+531.00C-131-1N132CDK85+532.80C-132-1N133CDK85+534.60C-133-1N134CDK85+536.40C-134-1N135CDK85+538.20C-135-1N136CDK85+540.00C-136-1N137CDK85+541.80C-137-1N138CDK85+543.60C-138-1N139CDK85+545.40C-139-1N140CDK85+547.20C-140-1N141CDK85+549.00C-141-1N142CDK85+550.80C-142-1N143CDK85+552.60C-143-1N144CDK85+554.40C-144-1N145CDK85+556.20C-145-1N146CDK85+558.00C-146-1N147CDK85+559.80C-147-1N148CDK85+561.60C-148-1N149CDK85+563.40C-149-1N150CDK85+565.20C-150-1N151CDK85+567.00C-151-1N152CDK85+568.80C-152-1N153CDK85+570.60C-153-1N154CDK85+572.40C-154-1N155CDK85+574.20C-155-1N156CDK85+576.00C-156-1N157CDK85+577.80C-157-1N158CDK85+579.60C-158-1N159CDK85+581.40C-159-1N160CDK85+583.20C-160-1N161CDK85+585.00C-161-1N162CDK85+586.59C-162-1N表4-2 B、D区桩基编号序号区段号里程编号序号区段号里程编号1BDK85+764.89B-1-1N1DDK86+127.50D-1-1N2BDK85+766.69B-2-1N2DDK86+129.30D-2-1N3BDK85+768.49B-3-1N3DDK86+131.10D-3-1N4BDK85+770.29B-4-1N4DDK86+132.90D-4-1N5BDK85+772.09B-5-1N5DDK86+134.70D-5-1N6BDK85+773.89B-6-1N6DDK86+136.50D-6-1N7BDK85+775.69B-7-1N7DDK86+138.30D-7-1N8BDK85+777.49B-8-1N8DDK86+140.10D-8-1N9BDK85+779.29B-9-1N9DDK86+141.90D-9-1N10BDK85+781.09B-10-1N10DDK86+143.70D-10-1N11BDK85+782.89B-11-1N11DDK86+145.50D-11-1N12BDK85+784.69B-12-1N12DDK86+147.30D-12-1N13BDK85+786.49B-13-1N13DDK86+149.10D-13-1N14BDK85+788.29B-14-1N14DDK86+150.90D-14-1N15BDK85+790.09B-15-1N15DDK86+152.70D-15-1N16BDK85+791.89B-16-1N16DDK86+154.50D-16-1N17BDK85+793.69B-17-1N17DDK86+156.30D-17-1N18BDK85+795.49B-18-1N18DDK86+158.10D-18-1N19BDK85+797.29B-19-1N19DDK86+159.90D-19-1N20BDK85+799.09