厚强风化地质条件下的嵌岩灌注桩桩基设计和施工
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摘要
针对薄覆盖层、厚强风化层地质条件下高桩码头的桩基选型,通过计算分析,比选斜灌注桩方案和直灌注桩方案。相对直灌注桩,斜灌注桩码头结构水平承载能力较高、桩身弯矩小,且工程造价低。针对斜灌注桩施工容易出现轴向偏位和塌孔的问题,根据工程实例归纳导向孔、加设导向器、预埋导管、沉设二级钢护筒等防治措施,为类似工程提供依据。
The selection of wharf punch bored pile foundation types is studied in condition of thick granular strongly weathered granite with thin covering layer.By the calculation of project example,the batter punch bored pile plan and vertical punch bored pile plan are compared. Comparing with the vertical punch bored pile, the batter punch bored pile plan is characterized by high horizontal bearing capacity,low bending moment and low engineering cost.According to the offset-axes and hole-collapse in the construction process of the batter punch bored pile,we summarize the prevention measures including adding the guide-hole,guide apparatus,pre-buried duct and driving the secondary steel casing,which can be used as reference for similar projects.
The selection of wharf punch bored pile foundation types is studied in condition of thick granular strongly weathered granite with thin covering layer.By the calculation of project example,the batter punch bored pile plan and vertical punch bored pile plan are compared. Comparing with the vertical punch bored pile, the batter punch bored pile plan is characterized by high horizontal bearing capacity,low bending moment and low engineering cost.According to the offset-axes and hole-collapse in the construction process of the batter punch bored pile,we summarize the prevention measures including adding the guide-hole,guide apparatus,pre-buried duct and driving the secondary steel casing,which can be used as reference for similar projects.
引文
[1]中交第一航务工程勘察设计院有限公司,中交第三航务工程勘察设计院有限公司,中交第一航务工程局有限公司.码头结构设计规范:JTS 167-2018[S].北京:人民交通出版社,2018.
[2]李世京,陈宏儒.澳门美高梅金殿工程大口径钻孔扩底灌注桩施工技术[J].探矿工程,2006(12):5-8.
[3]张明卓,杨学祥.某特大桥超长大直径钻孔灌注桩桩底压浆施工[J].山西建筑,2007,33(15):111-112.
[4]陈光垣,杨志文.中化泉州码头大直径灌注桩施工质量控制技术[J].水运工程,2012(7):208-212.
[5]麦冬生.斜向钻孔灌注桩施工技术[J].中国港湾建设,2002,10(5):42-44.
[6]顾祥奎.大直径斜桩嵌岩在洋山三期工程中的应用[J].水运工程,2008(10):109-112+119.
[7]张科胜.大直径、大斜度嵌岩桩冲击成孔施工技术在宁波大榭中油30万吨级码头工程的应用[J].港口科技,2011(1):9-12.
[8]童康民.大直径钢管斜桩全断面冲击成孔嵌岩桩的工程应用[J].探矿工程(岩土钻掘工程),2010,37(4):65-68.
[9]刘忠友,王振红.冲击钻在斜孔嵌岩钻孔中的开发利用[J].水运工程,2007(12):131-134.
[10]车永红,陈杰明.大直径钢管嵌岩斜桩成孔工艺技术研究[J].港工技术,2014,51(5):53-56.
[2]李世京,陈宏儒.澳门美高梅金殿工程大口径钻孔扩底灌注桩施工技术[J].探矿工程,2006(12):5-8.
[3]张明卓,杨学祥.某特大桥超长大直径钻孔灌注桩桩底压浆施工[J].山西建筑,2007,33(15):111-112.
[4]陈光垣,杨志文.中化泉州码头大直径灌注桩施工质量控制技术[J].水运工程,2012(7):208-212.
[5]麦冬生.斜向钻孔灌注桩施工技术[J].中国港湾建设,2002,10(5):42-44.
[6]顾祥奎.大直径斜桩嵌岩在洋山三期工程中的应用[J].水运工程,2008(10):109-112+119.
[7]张科胜.大直径、大斜度嵌岩桩冲击成孔施工技术在宁波大榭中油30万吨级码头工程的应用[J].港口科技,2011(1):9-12.
[8]童康民.大直径钢管斜桩全断面冲击成孔嵌岩桩的工程应用[J].探矿工程(岩土钻掘工程),2010,37(4):65-68.
[9]刘忠友,王振红.冲击钻在斜孔嵌岩钻孔中的开发利用[J].水运工程,2007(12):131-134.
[10]车永红,陈杰明.大直径钢管嵌岩斜桩成孔工艺技术研究[J].港工技术,2014,51(5):53-56.