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1、沈海复线宁德漳湾镇至连江浦口高速公路（宁德段）A1合同段钢护筒施工方案中国中铁编 制：复 核：审 批：中铁航空港集团沈海复线宁德漳湾至连江浦口高速公路A1项目经理部二零一三年十月钢护筒施工方案一、工程概况本标段王坑特大桥4#墩70#台桩基础设计有永久性钢护筒，桩长 26mr 66m不等，桩径以1.3、1.6、1.8、2.0为主。钻孔灌注永久桩钢护 筒不参与结构受力，其高出承台底以上部分进行切割回收利用。钢护筒材质为Q235壁厚分别为8mm 10mm 12mn,其内径为d+20cm,钢护筒顶标高以现场实际测量为准。二、钢护筒结构参数及工程量钢护筒的主要结构参数及工程量如下表：王坑桥钢护筒的主要结
2、构参数及工程量表K11+683.18王坑特大桥桩基统计表（左/右幅）墩台号设计桩径设计桩顶标高设计桩底标高桩长桩基钢护筒长度桩数（根）左右左右左右左右左右4#墩1.31.322-38-3840403.63.68根5#墩1.31.31.71.7-44.3-44.3464612.512.58根6#墩1.31.31.71.7-48.3-48.3505017178根7#墩1.321.71.7-43.3-43.3454514148根8#墩1.321.71.7-43.8-43.845.545.517.817.88根9#墩222.92.9-31.8-38.134.7418.28.24根10#墩221.81.
3、8-39.2-39.241418.18.14根11#墩221.71.7-48.3-48.3505012.612.64根12#墩2222-47.5-47.549.549.5884根13#墩221.81.8-47.7-47.749.549.510.510.54根14#墩221.81.8-48.2-48.2505010.210.24根15#墩221.81.8-51.2-51.2535314144根16#墩221.81.8-48.7-48.750.550.511.511.54根17#墩221.81.8-48.7-48.750.550.512124根18#墩221.81.8-50.7-50.752.55
4、2.513.713.74根19#墩221.81.8-51.2-51.2535314.614.64根20#墩221.91.9-50.6-50.652.552.515.515.54根21#墩2222-52.5-52.554.554.517.917.94根22#墩2222-58-58606017.117.14根23#墩222.12.1-57.9-57.9606019.119.14根24#墩222.22.2-57.8-57.8606021.221.24根25#墩222.22.2-59.8-59.8626220.420.44根26#墩222.22.2-61.3-61.363.563.516.916.94
5、根27#墩222.22.2-61.8-61.8646420204根28#墩222.12.1-62.4-62.464.564.523.123.14根29#墩1.81.82.22.2-62.3-62.364.564.521.521.54根30#墩1.81.82.32.3-63.7-63.7666620204根31#墩1.81.82.42.4-61.1-61.163.563.518.118.14根32#墩1.81.82.42.4-59.6-59.6626216.116.14根33#墩1.81.82.42.4-58.6-58.6616119.919.94根34#墩1.81.83.13.1-55.9-5
6、5.9595924.824.84根35#墩1.81.82.42.4-55.1-55.157.557.518.118.14根36#墩1.81.82.42.4-64.6-64.6676714.714.74根37#墩1.81.82.52.5-59-6161.563.514.414.44根38#墩222.82.8-53.7-58.256.56114.714.74根39#墩2222-59-59616115.115.14根40#墩221.71.7-69.3-71.87173.516.216.24根41#墩222.32.3-53.2-49.755.55215154根42#墩1.81.81.61.6-52.9
7、-52.954.554.517.817.84根43#墩1.81.81.61.6-52.9-52.954.554.518184根44#墩1.81.81.61.6-55.9-55.957.557.518.418.44根45#墩1.81.81.91.9-52.1-52.1545422.122.14根46#墩1.81.81.81.8-53.7-53.755.555.519.819.84根47#墩1.81.81.71.7-55.3-55.3575717.617.64根48#墩1.81.81.61.6-55.9-55.957.557.516.716.74根49#墩1.81.81.61.6-56.9-56.
8、958.558.516164根50#墩1.81.81.61.6-58.4-58.4606016.716.74根51#墩1.81.81.61.6-60.4-60.4626217.517.54根52#墩1.81.81.61.6-58.4-58.4606018.318.34根53#墩1.81.81.61.6-56.9-56.958.558.519.119.14根54#墩1.81.81.61.6-57.4-57.4595917.517.54根55#墩1.61.61.51.5-60.5-60.5626215.715.74根56#墩1.61.61.51.5-61-6162.562.516.916.94根5
9、7#墩1.61.61.81.8-61.7-61.763.563.518.418.44根58#墩1.61.61.81.8-60.7-60.762.562.518.418.44根59#墩1.61.61.81.8-58.2-58.2606018.218.24根60#墩1.61.61.81.8-60.2-60.2626218.118.14根61#墩1.61.61.91.9-61.1-61.1636318184根62#墩1.61.61.81.8-61.7-61.763.563.517.917.94根63#墩1.61.61.81.8-61.7-61.763.563.517.717.74根64#墩1.61.
10、61.81.8-48.7-48.750.550.524.424.44根65#墩1.61.61.81.8-52.7-52.754.554.523.523.54根66#墩1.61.61.81.8-51.7-53.253.55527.527.54根67#墩1.61.61.81.8-46.2-46.2484822.722.74根68#墩221.81.8-37.2-39.2394117.917.94根69#墩221.81.8-34.2-36.2363813.213.2/15.24根70#台1.61.62.42.4-23.6-25.626289.611.6/14.68根三、钢护筒结构设计3.1、钢护筒孔口结构根据桥位处的水文条件、钢护筒下放过程中的受力情况，以及满足钢护筒顶口振打和底口入土的要求，对钢护筒结构的进行了设计，最终确定钢护 筒直径 1.5m、1.8m、2.0m和2.2m。采用壁厚8mm 10m和12m啲Q235钢板卷制。为避免钢护筒在下沉过程中发生变形，分别对钢护筒的顶口和底口进行加强。护铜顶端、底端和接头处采用同钢护筒厚度相同的钢板进行加强，加强长度为 500mm钢护筒顶部和底 部加强钢板与钢护筒采用跳焊连接，每条焊缝长150mm净间距150mm3.2、导向架设计与制作3.2.1为保证钢护筒的准确定位及竖直度，
