腊八斤特大桥挖孔桩施工工艺.docx

1、腊八斤特大桥挖孔桩施工工艺 雅泸高速C4合同段腊八斤特大桥挖 孔 桩 施 工 工 艺1 编制依据及说明：1.1 雅泸高速C4合同段腊八斤特大桥施工图设计文件、设计说明、设计通知变更等。1.2 雅泸高速C4合同段施工组织设计。1.3 现行公路工程标准、规范、规程等，主要有： 公路工程质量检验评定标准（JTG B01-2003）； 公路工程水文勘测设计规范（JTG C30-2002）；公路桥涵设计通用规则(JTG D60-2004)；公路桥涵地基与基础设计规范(JTJ024-85)公路桥涵施工技术规范(JTJ041-2000)公路钢筋砼及预应力砼桥涵设计规范(JTG D62-2004) 2 工程概

2、况2.1.1 腊八斤特大桥中心里程K39+355，全长1106米，共17个墩台，其中0#桥台、1#3#引桥墩左右幅、4#6#、13#16#桩基直径为1.5m圆桩，桩长不大于25m，共计123根，总方量 3857.679m3。7#墩左右幅桩基直径为1.5m圆桩，桩长为35m；8#、12#交界墩桩基直径为2.0m圆桩，桩长为35m；9#10#住墩桩基直径为2.5m圆桩桩长为45m；11号主墩桩基直径为2.5m圆桩桩长为40m 共计 44根，总方量为9424.778m3。2.1.2 上述挖孔桩穿过的地层分为七大层,即第一层为低液限粘土,第二层为块石夹土,第三层为小块石质土，第四层为小块石夹土，第五层

3、为粉砂质泥岩，第六层为泥质粉砂岩，第七层为砂岩。岩性自上而下依次为：表层为低液限粘土,软硬塑状,厚06m。块石夹土，部分风化较强，质较硬,厚13m；小块石质土，部分风化较强，质较硬，24.5m小块石夹土，部分强风化，质较硬，2.58.6m粉砂质泥岩，弱风化岩石，质较硬，6.617m泥质粉砂岩，强风化岩石，质软，0.528.6m砂岩，强风化岩石，质较硬，2.528.7m，表1：挖孔桩技术数据桥墩编号桥墩桩号（m）桩顶标高（m）桩底标高（m） 桩长（m） 桩径（m）砼方量0号桥台左幅1k38+7801129.651113.65161.528.274330号桥台左幅21129.651113.6516

4、1.528.274330号桥台左幅31129.651113.65161.528.274330号桥台左幅41129.651113.65161.528.274330号桥台左幅51129.651113.65161.528.274330号桥台左幅61129.651113.65161.528.274330号桥台左幅71129.651113.65161.528.274330号桥台左幅81129.651113.65161.528.274330号桥台左幅91129.651113.65161.528.274331号桥台右幅1k38+8301121.1681106.168151.526.507191号桥台右幅21

5、121.1681106.168151.526.507191号桥台右幅31121.1681106.168151.526.507191号桥台右幅41121.1681106.168151.526.507191号桥台右幅51121.1681106.168151.526.507191号桥台右幅61121.1681106.168151.526.507191号桥台右幅71121.1681106.168151.526.507191号桥台右幅81121.1681106.168151.526.507191号桥台右幅91121.1681106.168151.526.507191号引桥左幅1k38+8301131.0

6、71111.07201.535.342921号引桥左幅21131.071111.07201.535.342921号引桥左幅31131.071111.07201.535.342921号引桥左幅41131.071111.07201.535.342922号引桥左幅1k38+8701118.0081093.008251.544.178652号引桥左幅21118.0081093.008251.544.178652号引桥左幅31118.0081093.008251.544.178652号引桥左幅41118.0081093.008251.544.178652号引桥右幅1k38+8701127.0081102

7、.008251.544.178652号引桥右幅21127.0081102.008251.544.178652号引桥右幅31127.0081102.008251.544.178652号引桥右幅41127.0081102.008251.544.178653号引桥左幅1k38+9101105.7681080.768251.544.178653号引桥左幅21105.7681080.768251.544.178653号引桥左幅31105.7681080.768251.544.178653号引桥左幅41105.7681080.768251.544.178653号引桥右幅1k38+9101114.76810

8、89.768251.544.178653号引桥右幅21114.7681089.768251.544.178653号引桥右幅31114.7681089.768251.544.178653号引桥右幅41114.7681089.768251.544.178654号墩左幅1k38+9501095.4481070.448251.544.178654号墩左幅21095.4481070.448251.544.178654号墩左幅31095.4481070.448251.544.178654号墩左幅41095.4481070.448251.544.178654号墩右幅1k38+9501085.4481060.

9、448251.544.178654号墩右幅21085.4481060.448251.544.178654号墩右幅31085.4481060.448251.544.178654号墩右幅41085.4481060.448251.544.178655号墩左幅1k38+9901084.5681059.568251.544.178655号墩左幅21084.5681059.568251.544.178655号墩左幅31084.5681059.568251.544.178655号墩左幅41084.5681059.568251.544.178655号墩右幅1k38+9901077.0681052.068251

10、.544.178655号墩右幅21077.0681052.068251.544.178655号墩右幅31077.0681052.068251.544.178655号墩右幅41077.0681052.068251.544.178656号墩左幅1k39+301066.1881041.188251.544.178656号墩左幅21066.1881041.188251.544.178656号墩左幅31066.1881041.188251.544.178656号墩左幅41066.1881041.188251.544.178656号墩右幅1k39+301057.1881032.188251.544.178

11、656号墩右幅21057.1881032.188251.544.178656号墩右幅31057.1881032.188251.544.178656号墩右幅41057.1881032.188251.544.178657号墩左幅1k39+701038.8081003.808351.561.85017号墩左幅21038.8081003.808351.561.85017号墩左幅31038.8081003.808351.561.85017号墩左幅41038.8081003.808351.561.85017号墩右幅1k39+701037.3081002.308351.561.85017号墩右幅21037.

12、3081002.308351.561.85017号墩右幅31037.3081002.308351.561.85017号墩右幅41037.3081002.308351.561.85018号交界墩左幅1k39+1101012.383977.383352109.95578号交界墩左幅21012.383977.383352109.95578号交界墩左幅31012.383977.383352109.95578号交界墩左幅41012.383977.383352109.95578号交界墩左幅1k39+1101004.383969.383352109.95578号交界墩左幅21004.383969.38335

13、2109.95578号交界墩左幅31004.383969.383352109.95578号交界墩左幅41004.383969.383352109.95579号主墩左幅1k39+215988.888943.888452.5220.89329号主墩左幅2988.888943.888452.5220.89329号主墩左幅3988.888943.888452.5220.89329号主墩左幅4988.888943.888452.5220.89329号主墩左幅5988.888943.888452.5220.89329号主墩左幅6988.888943.888452.5220.89329号主墩左幅7988.8

14、88943.888452.5220.89329号主墩左幅8988.888943.888452.5220.89329号主墩左幅1k39+215988.888943.888452.5220.89329号主墩右幅2988.888943.888452.5220.89329号主墩右幅3988.888943.888452.5220.89329号主墩右幅4988.888943.888452.5220.89329号主墩右幅5988.888943.888452.5220.89329号主墩右幅6988.888943.888452.5220.89329号主墩右幅7988.888943.888452.5220.893

15、29号主墩右幅8988.888943.888452.5220.893210号主墩左幅1k39+415952.988907.988452.5220.893210号主墩左幅2952.988907.988452.5220.893210号主墩左幅3952.988907.988452.5220.893210号主墩左幅4952.988907.988452.5220.893210号主墩左幅5952.988907.988452.5220.893210号主墩左幅6952.988907.988452.5220.893210号主墩左幅7952.988907.988452.5220.893210号主墩左幅8952.9

16、88907.988452.5220.893210号主墩右幅1k39+415952.988907.988452.5220.893210号主墩右幅2952.988907.988452.5220.893210号主墩右幅3952.988907.988452.5220.893210号主墩右幅4952.988907.988452.5220.893210号主墩右幅5952.988907.988452.5220.893210号主墩右幅6952.988907.988452.5220.893210号主墩右幅7952.988907.988452.5220.893210号主墩右幅8952.988907.988452.

17、5220.893211号主墩左幅1k39+6151054.1031014.103402.5196.349511号主墩左幅21054.1031014.103402.5196.349511号主墩左幅31054.1031014.103402.5196.349511号主墩左幅41054.1031014.103402.5196.349511号主墩左幅51054.1031014.103402.5196.349511号主墩左幅61054.1031014.103402.5196.349511号主墩右幅1k39+6151054.1031014.103402.5196.349511号主墩右幅21054.10310

18、14.103402.5196.349511号主墩右幅31054.1031014.103402.5196.349511号主墩右幅41054.1031014.103402.5196.349511号主墩右幅51054.1031014.103402.5196.349511号主墩右幅61054.1031014.103402.5196.349512号交界墩左幅1k39+7201088.7061053.706352109.955712号交界墩左幅21088.7061053.706352109.955712号交界墩左幅31088.7061053.706352109.955712号交界墩左幅41088.7061

19、053.706352109.955712号交界墩右幅1k39+7201088.7061053.706352109.955712号交界墩右幅21088.7061053.706352109.955712号交界墩右幅31088.7061053.706352109.955712号交界墩右幅41088.7061053.706352109.955713号引桥墩左幅1k39+7601118.2081093.208251.544.1786513号引桥墩左幅21118.2081093.208251.544.1786513号引桥墩左幅31118.2081093.208251.544.1786513号引桥墩左幅41

20、118.2081093.208251.544.1786513号引桥墩右幅1k39+7601118.2081093.208251.544.1786513号引桥墩右幅21118.2081093.208251.544.1786513号引桥墩右幅31118.2081093.208251.544.1786513号引桥墩右幅41118.2081093.208251.544.1786514号引桥墩左幅1k39+8001136.6851111.685251.544.1786514号引桥墩左幅21136.6851111.685251.544.1786514号引桥墩左幅31136.6851111.685251.5

21、44.1786514号引桥墩左幅41136.6851111.685251.544.1786514号引桥墩右幅1k39+8001136.6851111.685251.544.1786514号引桥墩右幅21136.6851111.685251.544.1786514号引桥墩右幅31136.6851111.685251.544.1786514号引桥墩右幅41136.6851111.685251.544.1786515号引桥墩左幅1k39+8401143.1881118.188251.544.1786515号引桥墩左幅21143.1881118.188251.544.1786515号引桥墩左幅3114

22、3.1881118.188251.544.1786515号引桥墩左幅41143.1881118.188251.544.1786515号引桥墩右幅1k39+8401149.1881124.188251.544.1786515号引桥墩右幅21149.1881124.188251.544.1786515号引桥墩右幅31149.1881124.188251.544.1786515号引桥墩右幅41149.1881124.188251.544.1786516号引桥墩左幅1k39+8801152.7481132.748201.535.3429216号引桥墩左幅21152.7481132.748201.535

23、.3429216号引桥墩左幅31152.7481132.748201.535.3429216号引桥墩左幅41152.7481132.748201.535.3429216号桥台右幅1k39+8801162.651146.65161.528.2743316号桥台右幅21162.651146.65161.528.2743316号桥台右幅31162.651146.65161.528.2743316号桥台右幅41162.651146.65161.528.2743316号桥台右幅51162.651146.65161.528.2743316号桥台右幅61162.651146.65161.528.274331

24、6号桥台右幅71162.651146.65161.528.2743316号桥台右幅81162.651146.65161.528.2743316号桥台右幅91162.651146.65161.528.27433针对这17个墩台钻孔桩桩长较短且均为嵌入弱风化砂岩夹泥质粉砂岩层内的特点，拟选择挖孔桩施工。四周采用混凝土外齿式护壁，护壁厚度15cm20cm，砼强度等级不小于C20，对于桩径大于200cm 的孔，护壁厚度20cm，并设置不小于6环形钢筋，间距不大于200mm。确保不坍孔，爆破后不出现裂缝和垮坍。挖孔桩挖孔和挖孔桩护壁示意图如下：挖孔桩挖孔示意图 挖孔桩护壁示意图4 主要施工机械设备表二：

25、主要施工机具设备表名 称型 号单位数 量功 率功 用砼输送泵台2运输砼拌和楼1000L套2搅拌砼凿岩机手持式台8打炮眼、凿岩石振动棒50mm、80mm台各4砼振捣空压机台1215风镐台2430打眼铰架台60提土、取渣吊机16t或25t辆2灌注混凝土、安装钢筋笼潜水泵台48抽水电焊机BSQ6-400台4617/13KW钢筋笼制安混凝土漏斗个4混凝土灌注导管或串筒250米90灌注砼用， 4套5 开工前准备工作：5.1 施工便道、临时设施 桩基施工用的临时设施，如施工便道、供水、供电、临时房屋，在开工前准备就绪，以保证桩基施工正常作业。5.2场地平整、支护及防排水 5.1.2 场地平整、支护、防排水 腊八斤特大桥0#16#墩位于山坡上，在进行挖孔桩施工前，10#桥墩承台外侧20米破面上进行预应力锚索框架梁边坡防护，以保证桥梁下部结构施工时边坡永久稳定；挖孔桩施工前先明挖承台，适当放坡开挖，清除不稳定的土