大节段变截面墩身钢筋部品化施工关键技术
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摘要
深中通道S07合同段陆域引桥墩身为六边形变截面实心墩,墩身最高为37.1m,顺桥向厚度固定(最大厚度为3m),横桥向变宽(最大宽度为7.65m),主筋为双层直径40mm钢筋,单个墩身钢筋用量达99.01t。墩身钢筋部品化施工采用"分节段预制,现场分节段吊装"技术。钢筋部品分节长度为6m,立式绑扎;布置15个高7m标准绑扎胎架,采用方钢制作,竖向布置3层环向作业平台,底层和顶部布置定位架以控制钢筋部品尺寸;采用BIM建模,用数控弯曲机加工钢筋;钢筋部品采用龙门吊吊装、立式运输,吊具采用双[20型钢和倒链制作,横桥向宽度可调节;采用锥套锁紧接头,确保对接质量。
In the S07 contract of the Shenzhen-Zhongshan Link,the ground piers of the approach bridge are solid piers.The pier columns have variable hexagonal cross-sections,with a maximum height of 37.1m.The thickness of the pier column along the bridge length is constant(with a maximum thickness of 3m),but gradually increases along the bridge width(with a maximum width of 7.65m).The main reinforcement is the■ 40mm reinforcing bars,placed in two layers.The amount of reinforcement in a single pier column reaches up to 99.01t.The reinforcement in the pier columns was constructed by the technique of sectional prefabrication and on-site sectional lifting and installation.The length of the reinforcement was determined to be 6m,and the reinforcing bars were bound in vertical position.A number of 15 standard binding jigs each 7m high were prepared,and the material for the reinforcement was the square steel.To each binding jig,three layers of circular working platforms were placed vertically,and to the top and base layers,positioning frames were installed to control the dimension of the reinforcement.The BIM technology was used,and the reinforcement was processed by the CNC bending machine.The prefabricated reinforcement was lifted by gantry cranes and placed in vertical position for transportation.The lifting tools were made of double[20 section steel and chain blocks,the width of which in the transverse direction could be adjusted.The joints were locked by cone sockets,to ensure the quality of the joints and realize the construction of the prefabricated reinforcement.
In the S07 contract of the Shenzhen-Zhongshan Link,the ground piers of the approach bridge are solid piers.The pier columns have variable hexagonal cross-sections,with a maximum height of 37.1m.The thickness of the pier column along the bridge length is constant(with a maximum thickness of 3m),but gradually increases along the bridge width(with a maximum width of 7.65m).The main reinforcement is the■ 40mm reinforcing bars,placed in two layers.The amount of reinforcement in a single pier column reaches up to 99.01t.The reinforcement in the pier columns was constructed by the technique of sectional prefabrication and on-site sectional lifting and installation.The length of the reinforcement was determined to be 6m,and the reinforcing bars were bound in vertical position.A number of 15 standard binding jigs each 7m high were prepared,and the material for the reinforcement was the square steel.To each binding jig,three layers of circular working platforms were placed vertically,and to the top and base layers,positioning frames were installed to control the dimension of the reinforcement.The BIM technology was used,and the reinforcement was processed by the CNC bending machine.The prefabricated reinforcement was lifted by gantry cranes and placed in vertical position for transportation.The lifting tools were made of double[20 section steel and chain blocks,the width of which in the transverse direction could be adjusted.The joints were locked by cone sockets,to ensure the quality of the joints and realize the construction of the prefabricated reinforcement.
引文
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[3]陈山亭.港珠澳大桥浅水区非通航孔桥下部结构施工关键技术[J].桥梁建设,2016,46(1):6-11.
[4]成军.城市桥梁墩柱钢筋整体安装施工方法:中国,CN201510167418.6.3[P].2015-04-10.
[5]魏乐永,曹明明,崔冰,等.望东长江公路大桥上部结构装配化架设方法研究[J].桥梁建设,2019,49(1):119-124.
[6]乔健.漫谈中国铁路桥梁发展的历程[J].铁道标准设计,2012(3):27-30.
[7]沈阳云.东海大桥墩身节段预制安装关键技术[J].公路,2003(8):99-102.
[8]胡俊,陈儒发,曾一峰,等.海上预制承台与桩基础连接施工过程的振动监测与分析[J].世界桥梁,2016,44(2):41-46.
[9]王德文,肖世波,文建勇.港珠澳大桥埋置式预制承台安装体系转换的设计与施工[J].铁道勘察,2018(3):139-143.