坚硬岩石地层钻孔桩旋挖钻机成孔技术
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摘要
新建商合杭铁路芜湖长江公铁大桥主桥为(98+238+588+224+84)m钢箱板桁结合梁高低矮塔斜拉桥。主桥0号边墩和1号辅助墩均为22■2.5m钻孔桩基础,设计桩长42～58m,入岩深度17～28m,岩石最大强度达151MPa,采用旋挖钻机施工成孔。旋挖钻机布置在水上钻孔平台上,钻孔过程中采用优质膨润土化学泥浆护壁。覆盖层中采用截齿钻头全断面钻进;倾斜或软硬交界岩面采用"稳定器+截齿钻头或取芯钻头"钻进1.2～1.5m;坚硬岩层中采用牙轮环切钻头和扩孔钻头按照■1.5m→■2.0m→■2.5m分3级钻进成孔。最后采用泵吸反循环清孔。
The main bridge of Wuhu Changjiang River Rail-cum-Road Bridge on the newlybuilt Shangqiu-Hefei-Hangzhou high-speed railway is an extradosed bridge with five spans of 98,238,588,224 and 84m.The bridge has two pylons of different heights and the main girder is the composite structure formed of steel box beams,steel trusses and concrete slabs.The No.0 end pier and the No.1 auxiliary pier all stand on the foundation formed of 22,■2.5m bored piles.The piles have the designed lengths of 42 to 58m,and extend about 17 to 28m into the rock.The maximum hardness of the rock reached up to 151 MPa,as a result,the rotary drilling rigs were used to make holes for the piles.The rotary drilling rigs were placed on the water drilling platform,and high-quality bentonite slurry was filled to protect the walls of the holes during the hole drilling process.For the overburden,cutting bits were used for full cross-section drilling.For the oblique rock surfaces or the soft and hard rock interfaces,"the stabilizer and cutting bits or coring bits"were used in combination to drill a depth of 1.2 to 1.5m.In the hard rock strata,the rolling cutter bits and reamers were used to form holes from a diameter of■ 1.5m through■ 2.0m to■ 2.5m.At last,the holes were cleared by pumps by means of reverse circulation.
The main bridge of Wuhu Changjiang River Rail-cum-Road Bridge on the newlybuilt Shangqiu-Hefei-Hangzhou high-speed railway is an extradosed bridge with five spans of 98,238,588,224 and 84m.The bridge has two pylons of different heights and the main girder is the composite structure formed of steel box beams,steel trusses and concrete slabs.The No.0 end pier and the No.1 auxiliary pier all stand on the foundation formed of 22,■2.5m bored piles.The piles have the designed lengths of 42 to 58m,and extend about 17 to 28m into the rock.The maximum hardness of the rock reached up to 151 MPa,as a result,the rotary drilling rigs were used to make holes for the piles.The rotary drilling rigs were placed on the water drilling platform,and high-quality bentonite slurry was filled to protect the walls of the holes during the hole drilling process.For the overburden,cutting bits were used for full cross-section drilling.For the oblique rock surfaces or the soft and hard rock interfaces,"the stabilizer and cutting bits or coring bits"were used in combination to drill a depth of 1.2 to 1.5m.In the hard rock strata,the rolling cutter bits and reamers were used to form holes from a diameter of■ 1.5m through■ 2.0m to■ 2.5m.At last,the holes were cleared by pumps by means of reverse circulation.
引文
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[9]李腾辉.旋挖钻在岩石地质钻孔灌注桩施工中的应用[J].公路交通科技(应用技术版),2018(1):215-216.
[2]吏林山.武汉青山长江公路大桥19号墩钻孔桩施工技术[J].桥梁建设,2016,46(3):6-10.
[3]王彦虎,李相周,李晶晶.复杂地质超深入岩大直径旋挖钻孔灌注桩施工技术研究与应用[J].交通科技,2016(6):37-39.
[4]文敏.深空孔超长嵌硬岩桩关键施工技术研究与应用[J].广东土木与建筑,2015(4):34-36.
[5]马红月,郑现磊,张西坤,等.旋挖钻头设计制造数据库系统设计[J].探矿工程,2016,43(5):63-66.
[6]王际好,张宏钰,李禄盛.复杂地质超长桩旋挖钻施工技术[J].公路,2016(6):151-155.
[7]高英杰.复杂地质条件下化学泥浆护壁旋挖高效成孔技术[J].铁道建筑技术,2014(3):63-66.
[8]吴先锋,周冬,施德.硬岩钻孔桩旋挖钻环切取芯快速成孔施工技术[J].中国新技术新产品,2018(13):90-92.
[9]李腾辉.旋挖钻在岩石地质钻孔灌注桩施工中的应用[J].公路交通科技(应用技术版),2018(1):215-216.
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